JPH09391U - Backflow prevention device for bath - Google Patents

Abstract

(57) [Summary] [Purpose] Hot water is dropped from the water heater side into the bathtub by tap water pressure, and the edge of the bathtub side and the water heater side is surely cut off. [Structure] The edging room 16 in the hot water supply passage from the water heater side to the bathtub
Is provided. In the edge room, there is a valve hole passage 24 that leads to the water heater side.
A valve hole 41 and a passage 45 communicating with the bath. Check valve
An air release valve 27 is provided below 26. Atmospheric release valve 27 is Tsuba 33
The check valve 26 is held by the engagement of the engagement piece 40 with the engagement piece 40, and a gap 43 is provided between the collar 33 and the engagement piece 40. A pilot valve hole 36 is provided on the valve 42 side, and the pilot valve 36 is opened and closed by a valve 37 provided at the lower end of the body 32 of the check valve 26. The check valve 26 closes the valve hole passage 24 by the upward biasing force of the spring 44. When dropping hot water, push down the check valve 26
The valve hole 41 is closed at 42 and the pilot valve hole 36 is closed at the valve 37. Spring 44 when hot water is stopped
The check valve 26 is moved upward by the upward force to open the pilot valve hole 36, and then the valve 42 is moved upward.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a backflow prevention device for a bath, which is provided in a hot water supply passage for dropping hot water of a water heater into a bathtub to automatically fill the bath, and prevents backflow from the bathtub side to the water heater side. .

[0002]

[Prior art]

 As is well known, a hot water supply system for a bath is constructed by branching a hot water supply pipe of a water heater and connecting one of the hot water supply pipes to a reheating circulation line of a bath kettle through the branch pipe and the reheating circulation pipe. It is used to fill the bath automatically by filling it in the bathtub. Normally, this hot water supply system is equipped with a backflow prevention device that prevents the water on the bath side from flowing back to the water heater side.

FIG. 4 shows a hot water supply system for a bath provided with a backflow prevention device. In the figure, the bathtub 1 is provided with a reheating circulation pipe line 4 that sucks hot and cold water in the bathtub 1 by a circulation pump 2 and returns it to the bathtub 1 through a reheating heat exchanger 3 and cold water is provided on the water heater side. A hot water supply pipe 7 is provided which heats the water supplied from the pipe 5 by the hot water supply heat exchanger 6 and sends the hot water obtained by this heating to a desired place. The hot water supply pipe 7 and the additional heating circulation pipe line 4 are connected via a solenoid valve 10, a hopper 11 as a backflow prevention means, and a check valve 12, and when the bathtub 1 is filled with hot water, the hot water supply pipe 7 Through the solenoid valve 10, the hopper 11, and the check valve 12 in this order, the hot water is dropped into the bathtub 1 from the reheating circulation line 4. The hopper 11 completely separates the hot water supply pipe 7 from the reheating circulation pipe line 4 and completely blocks the hot water from the bathtub 1 side from flowing back to the hot water supply pipe 7 side.

[0004]

[Problems to be solved by the device]

 However, since this former backflow prevention device is composed of the hopper 11, when supplying hot water from the water heater side to the reheating and circulating pipe line 4 side, the water pressure on the solenoid valve 10 side does not reverse. Since it was not directly added to the conduit on the valve 12 side, the filling speed slowed down and there was the inconvenience that it took a long time to complete the filling.

The present invention has been made to solve the above-mentioned conventional problems, and an object thereof is to perform hot water filling using tap water pressure, and moreover, the hot and cold water on the bathtub side is connected to the hot water supply pipe side. An object is to provide a backflow prevention device for a bath that can completely prevent backflow.

[0006]

[Means for Solving the Problems]

 The present invention is configured as follows to achieve the above object. That is, a first invention is a backflow prevention device for a bath, which is provided in a hot water supply passage that guides hot water produced by a hot water supply device to a bathtub, and performs a border between the water heater side and the bathtub side, and the backflow prevention device is An edge cutout chamber is provided, and a drainage chamber containing an overflow pipe is integrally connected below the edge cutout chamber, and an inflow valve port into which hot water from the water heater side flows is connected to the upper side of the edge cutout chamber. At the lower side, an atmosphere valve communicating with the drainage chamber is provided, at the side side there is an outlet for discharging the hot water passing through the edging chamber to the bathtub side, and in the edging chamber there is a reverse opening / closing of the inlet valve. A stop valve, an atmosphere opening valve that is arranged below the check valve to open and close the atmosphere valve opening, and a spring that urges the check valve upward to close the inflow valve opening are housed. The release valve is held by the check valve through a play gap that allows vertical relative movement. And the check valve is moved upwards to close the inlet of the check valve by upward movement of the check valve, open the atmosphere valve opening by the atmosphere opening valve, and inflow by the check valve by downward movement of the check valve. The air valve is opened and the air valve is closed by the air opening valve.The air opening valve is formed with a pilot valve hole that connects the drainage chamber and the edging chamber, and is provided on the lower end side of the check valve. Is provided with a pilot valve that opens and closes the pilot valve hole, the pilot valve is closed by the downward movement of the check valve, and the pilot valve is closed by the upward movement of the check valve within the play gap. The means for solving the problem is to open the pilot valve hole by the method described above before opening the atmosphere opening valve.

A second invention is a backflow prevention device for a bath, which is provided in a hot water supply passage for guiding hot water produced by a hot water supply device to a bathtub, and performs a border between the hot water supply device side and the bathtub side, wherein the backflow prevention device is A rim cutting chamber is provided, and a main valve chamber communicating with the hot water supply passage on the water heater side is integrally connected above the rim cutting chamber, and a main opening / closing valve for opening and closing the passage leading to the rim cutting chamber is integrally connected to the main valve chamber. An inlet valve port for hot water flowing from the main valve chamber side is provided on the upper side of the edging chamber, an atmosphere valve port communicating with the atmosphere is provided on the lower side, and an edging chamber is provided on the side side. Each of the outlets for hot water flowing out to the bathtub side is provided, and a check valve for opening and closing the inflow valve port is provided in the rimming chamber, and an atmosphere release valve for opening and closing the atmosphere valve port is disposed below the check valve. And push the check valve upward to close the inlet valve. And the atmosphere release valve is held by the check valve through a play gap of vertical relative movement and interlocks with the check valve, and the check valve moves upward to close the inflow valve port by the check valve. And the atmosphere release valve is used to open the atmosphere valve opening, the check valve is moved downward to open the inflow valve opening with the check valve, and the atmosphere opening valve is used to close the atmosphere valve opening. Has a pilot valve hole communicating with the atmosphere, and a pilot valve for opening and closing the pilot valve hole is provided on the lower end side of the check valve, and the pilot valve hole by the pilot valve is provided by downward movement of the check valve. The pilot valve is opened by the upward movement of the check valve in the play gap before the opening of the atmosphere release valve. It is.

Further, a third aspect of the invention is the one having the structure of the first or the second aspect of the invention, in which the atmosphere release valve is held by a check valve having a fitting portion that is vertically slidable. The holding portion is provided at a position near the lower side of the inflow valve opening closing portion of the check valve and serves as a means for solving the problem.

A fourth aspect of the invention is the one having the configuration of the first, second or third aspect of the invention, wherein the atmosphere release valve is a check valve and a fitting portion that is vertically slidable. The holding portion is configured to hold the lower surface of the brim, which is formed on the atmosphere release valve, with an engaging piece extended from the check valve. It has been.

Further, a fifth invention is a backflow prevention device for a bath, which is provided in a hot water supply passage for guiding hot water produced by a hot water supply device to a bathtub, and performs a border between the hot water supply device side and the bathtub side, in the backflow prevention device. Is equipped with an edging chamber, an inlet valve port through which hot water from the water heater side flows into the upper side of the edging chamber, an atmospheric valve port leading to the atmosphere on the lower side, and an edging chamber on the side side. Each of the outlets for hot water flowing out to the bathtub side is provided, and a check valve for opening and closing the inflow valve port is provided in the rimming chamber, and an atmosphere release valve arranged below the check valve for opening and closing the atmosphere valve port. And a spring for urging the check valve upward to close the inflow valve opening, and the check valve includes a central shaft-shaped body at a position below the closing portion of the inflow valve opening. A skirt that extends out of the body and extends downwards along the side wall of the edging chamber. -Shaped wall plate is provided, an engagement piece that projects toward the body is fixedly formed inside the skirt-shaped wall plate, and a flange that projects outward is formed above the atmosphere release valve. Now, the engagement piece is engaged with the lower side of the collar via a play gap that allows relative movement in the vertical direction, and the atmosphere release valve is held by the check valve. When the check valve is engaged, the atmosphere release valve is linked to the check valve, and the check valve moves upward to close the inflow valve opening by the check valve and open the atmosphere valve opening by the atmosphere release valve, and lower the check valve. The check valve is used to open the inflow valve opening and the atmosphere opening valve to close the atmosphere valve opening, and the atmosphere opening valve is formed with a pilot valve hole that communicates with the atmosphere in the edging chamber. A pilot valve for opening and closing the pilot valve hole is provided at the lower end of the body of the check valve. The downward movement of the check valve causes the pilot valve hole to be closed by the pilot valve, and the upward movement of the check valve within the play gap causes the opening of the pilot valve hole by the pilot valve before opening the atmosphere opening valve. It is a means to solve the problem by having a configuration that is performed.

[0011]

[Action]

 In the present invention having the above structure, when hot water is supplied to the bathtub, the hot water on the water heater side enters the inflow valve opening of the rimming chamber, and the check valve is lowered by the water pressure of the hot water against the biasing force of the spring. , The inflow valve opening is opened, and the atmosphere opening valve closes the atmosphere valve opening in conjunction with this check valve, so that the hot water supplied is directly applied to the hot water, and the hot water flowing into the rimming chamber flows. It comes out of the exit and is dropped into the bathtub.

When the dropping of the hot water into the bath is stopped, the application of the hot water pressure to the check valve is canceled, so the check valve moves upward due to the upward biasing force of the spring. At the start, the same water pressure in the edging chamber is applied to the upper and lower surfaces of the check valve, so the check valve is formed in the holding part with the atmosphere release valve by the biasing force of the spring and moves quickly upward in the play gap section. However, as a result of the upward movement of the check valve and the upward movement of the pilot valve, the pilot valve hole is opened to the atmosphere.

Due to the opening of the pilot valve hole, the atmosphere enters the rimming chamber, and the pressure difference between the pressure for pushing the atmosphere opening valve against the atmosphere valve opening by the water pressure in the rimming chamber and the atmospheric pressure for pushing up the atmosphere opening valve (water pressure). As a result, the check valve is moved upward in the play gap section relative to the atmosphere release valve, and then the atmosphere release valve is held in engagement with the check valve. Then, it quickly moves upward and the atmosphere valve opening is opened, and the edges of the bathtub side and the hot water supply pipe side are cut off. In addition, the inlet valve is closed by the check valve.

[0014]

【Example】

 Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the description of this embodiment, the same parts as those in the conventional example are designated by the same reference numerals, and detailed description thereof will be omitted. FIG. 1 shows an embodiment of a system for preventing backflow of a bath according to the present invention as an example of a system configuration of an automatic bathtub, and FIG. 2 shows an enlarged detail of a valve mechanism portion of the system for preventing backflow in the same embodiment. The figure is shown. In these drawings, the backflow prevention device includes a main valve chamber 15, an edge cutting chamber 16, a drainage chamber 17, and a discharge valve chamber 18.

The inlet passage 20 of the main valve chamber 15 is connected to the hot water supply pipe 7 of the water heater 21 via the pipe 9 on the upstream side of the hot water supply passage. A cylindrical wall that functions as a valve seat 23 projects from the bottom wall 22 of the main valve chamber 15, and a pilot that functions as a main opening / closing valve that opens and closes the inlet side of the valve hole passage 24 is located above the valve seat 23. A solenoid valve 25 is provided.

The edging chamber 16 is integrally connected to a lower position of the main valve chamber 15, and the edging chamber 16 is provided with a first check valve 26 and an atmosphere opening valve 27. There is.

The first check valve 26 has a valve body 28 that can move up and down along the inner wall surface of the edging chamber 16, and a seal member 30 such as an O ring is provided on the upper side of the valve body 28. The seal member 30 abuts the inclined wall surface 31 provided on the outlet side of the valve hole passage 24, and the vertical movement of the valve body 28 causes the inlet port of the outlet of the valve hole passage 24 to move. It is designed to open and close. The center of the valve body 28 is provided with a body portion 32 having a central axis protruding downward, and the body portion 32 is provided with a tubular member 34 having a flange 33 protruding outward so that it can slide up and down. It is fitted loosely. The cylindrical member 34 has a cylindrical wall extending upward from the bottom along the body 32, and is adjacent to the rear surface (lower surface) of the horizontally extending surface 70 of the skirt-shaped wall plate 39 of the valve body 28 described later. The flange 33 is formed so as to extend outward from the tip side of the cylinder wall extended to the position. A pilot valve hole 36 is formed at the center of the bottom wall 35 of the tubular member 34. The pilot valve hole 36 faces the lower end surface of the body portion 32 of the valve body 28. A valve 37 functioning as a pilot valve is provided on the lower end surface, and the valve 37 opens and closes the pilot valve hole 36. Is to be done.

At the lower side of the portion where the seal member 30 of the valve body 28 is formed (the closing portion of the inflow valve port), the edge of the valve body 28 is protruded in the direction orthogonal to the valve hole passage 24 and then cut substantially. A skirt-shaped wall plate 39 extending downward along the side wall of the chamber 16 is provided, and from this wall plate 39, an engagement piece 40 fixed to the wall plate 39 is directed toward the inner body portion 32 and the collar 33 is provided. It is extended to the lower position of the collar 33 so as to face the lower surface of the and is projected. The engagement piece 40 is configured to engage with the lower side of the collar 33 when the valve body 28 moves upward, and to pull up the tubular member 34 in conjunction with the valve body 28.

A valve 42 is provided on the lower end surface side of the bottom wall 35 of the tubular member 34 to open and close a valve hole 41 as an atmosphere valve port that connects the edging chamber 16 and the drainage chamber 17. In the present embodiment, the bottom wall 35 of the tubular member 34 and the outer diameter d of the valve 42 are formed smaller than the outer diameter D of the tubular portion forming the valve hole 41 (see FIG. 3). It is difficult to receive the upward force of the swirling water flow. The valve hole 41 is closed by the valve 42 by the downward movement of the valve body 28. At this time, as shown in FIG. 3, a gap 43 functioning as a play gap is formed between the engagement piece 40 and the collar 33. . This gap 43 enables relative movement in the vertical direction between the engaging piece 40 side and the brim 33 side. A spring 44 is disposed between the engagement piece 40 and the bottom wall of the edging chamber 16, and the valve body 28 is normally urged upward by the restoring force of the spring 44 and the outlet of the valve hole passage 24. The side is closed by the seal member 30, and the valve hole 41 is opened in this state. The valve 42 having the pilot valve hole 36 therein and the portion of the tubular member 34 that integrally holds the valve 42 constitute an atmosphere opening valve 27 that opens and closes the valve hole 41.

In this embodiment, the collar 33 is provided on the upper side of the atmosphere release valve 27, that is, on the upper side of the tubular member 34, and the engaging piece 40 is also on the upper side as much as possible, that is, the valve body 28. A holding portion (holding portion by engagement of the atmosphere release valve 27 by the first check valve) provided at a position near the lower side of the seal member mounting portion by engagement of the collar 33 and the engaging piece 40 is provided in the edging chamber 16. It is provided so that it is located above the bottom surface.

The discharge valve chamber 18 has an upper chamber 46 and a lower chamber 47 and is arranged adjacent to the edging chamber 16, and the edging chamber 16 and the upper chamber 46 are provided by a passage 45 extending laterally from a side wall of the edging chamber 16. The communication with is being made. The inlet of this passage 45 functions as an outlet for discharging the hot water passing through the edging chamber 16 to the bathtub side. A valve hole 50 is formed in the partition wall 48 of the upper chamber 46 and the lower chamber 47, and a negative pressure closing valve 51 is provided on the inlet side of the valve hole 50. The negative pressure closing valve 51 and the upper chamber A compression spring 53 is provided between the top walls 52 of the valves 46, and the valve hole 50 is closed by a negative pressure stop valve 51 under the biasing force of the spring 53. On the other hand, the lower chamber 47 is provided with a second check valve 54 that opens and closes the outlet side of the valve hole 50, and a compression between the second check valve 54 and the bottom of the lower chamber 47 is similarly performed. A spring 55 having a circular shape is provided, and the outlet side of the valve hole 50 is closed by a second check valve 54 by the urging force of the spring 55. The lower chamber 47 is connected to the reheating circulation line 4 via a hot water filling pipe 56 that constitutes the downstream side of the hot water supply passage.

A guide shaft 57 projects upward from the bottom surface side of the drainage chamber 17 that communicates with the edging chamber 16 via the valve hole 41, and a float 58 is slidable on the guide shaft 57. It is fitted. A magnet (not shown) is attached to the float 58, and a reed switch (not shown) is provided on the wall surface of the drainage chamber 17, so that the float 58 is subjected to buoyancy to rise to a preset water level. At this time, the magnet on the float 58 side and the reed switch face each other, and the on signal for starting the circulation pump 2 is output from the reed switch. The magnet on the float 58 side and the lead switch are used. A water level switch is formed. Further, an overflow pipe 60 protruding upward from the bottom wall side of the drainage chamber 17 is provided, and when the water level of the drainage chamber 17 exceeds the upper end of the overflow pipe 60, the overflow water (hot water) Are discharged to the outside through the overflow pipe 60.

Further, the inlet side of the drainage pipe 61 is communicated with the bottom wall of the drainage chamber 17, and the outlet side of the drainage pipe 61 is the return pipe 59 of the reheating circulation line 4, that is, the suction of the circulation pump 2. Is connected to the side pipeline. The drain pipe 61 is provided with a third check valve 62 and a solenoid valve 63 that functions as a first control opening / closing valve. Further, an electric two-way valve 64 as a second control opening / closing valve is provided in the return pipe 59 closer to the bathtub 1 side than the connection portion on the outlet side of the drainage pipe 61. In the figure, 65 is a flow rate sensor, 66 is a water amount control valve, 67 is a water level sensor (pressure sensor) that detects the water level in the bathtub 1 by pressure, and 68 is an additional heating water switch that detects the flow of additional heating water. Shown respectively.

The backflow prevention device for a bath according to this embodiment is configured as described above, and its operation will be described below. First, when the inlet side of the valve hole passage 24 is opened by the opening operation of the pilot solenoid valve 25, the hot water supplied from the hot water supply pipe 7 side enters the valve hole passage 24, and the water pressure thereof causes the valve body 28 to move to the spring 44. It is pushed downward against the biasing force to open the inflow valve port on the outlet side of the valve hole passage 24. The downward movement of the valve 37, which is interlocked with the downward movement of the valve body 28, closes the pilot valve hole 36, and similarly the valve hole 41 is closed by the downward movement of the valve 42, so that the edging chamber 16 and the drainage chamber 17 are closed. Communication is cut off. Due to this disconnection, the hot water entering the edging chamber 16 pushes up the negative pressure shutoff valve 51 by the water pressure to enter the valve hole 50, and further pushes the second check valve 54 downward against the urging force of the spring 55. As a result of the opening of the outlet side of the valve hole 50, the hot water enters the lower chamber 47 through the valve hole 50, further enters the reheating circulation line 4 through the filling pipe 56, and the forward pipe 69 of this reheating circulation line 69. And it is dropped by the water pressure into the bathtub 1 from both sides of the return pipe 59.

When the water level for filling the bathtub 1 reaches the set water level, the inlet of the valve hole passage 24 is closed due to the closing operation of the valve of the pilot solenoid valve 25, so that the valve body 28 is pressed downward. The upward biasing force of the spring 44 overcomes the force, and the valve body 28 starts to move upward. At this time, as shown in FIG. 3, a gap 43 is formed between the flange 33 of the tubular member 34 on which the valve 42 is formed and the engaging piece 40 on the valve body 28 side. The engaging piece 40 moves upward until it engages with the collar 33, and the upward movement of the valve body 28 also moves the valve 37 to move upward. As a result, the pilot valve hole 36 is opened first.

Then, as a result of the atmosphere on the side of the drainage chamber 17 entering the edging chamber 16 through the pilot valve hole 36, the edging chamber 16 becomes atmospheric pressure, and the valve 42 utilizing the water pressure in the edging chamber 16 is used. The closing force by pressing the hole 41 is released. When the valve body 28 continues to rise further due to the restoring force of the spring 44, the engaging piece 40 engages with the flange 33 and the tubular member 34 moves upward integrally with the valve body 28, so that the valve 42 also integrates. The valve hole 41 is completely opened, and the outlet side of the valve hole passage 24 is closed by the seal member 30 of the first check valve 26.

At this time, the hot water filled in the rim cutting chamber enters the drain chamber 17 side through the valve hole 41. At this time, when the float 58 is lifted to the set position due to the buoyancy, an ON signal is output from the reed switch. The electromagnetic valve 63 is output, the electric two-way valve 64 is closed, and the circulation pump 2 is started. Therefore, the water accumulated in the drainage chamber 17 passes through the drainage pipe 61, and then the circulation pump 2 It is forcibly discharged into the bathtub 1 from the outward pipe 69 side of the reheating circulation line 4.

Simultaneously with the closing operation of the pilot solenoid valve 25, the negative pressure closing valve 51 closes the inlet side of the valve hole 50 by the urging force of the spring 53, and the air on the drainage chamber 17 side passes through the edging chamber 16 and the valve is closed. Prevent entry into hole 50. The second check valve 54 also closes the outlet side of the valve hole 50 by the urging force of the spring 55 at the same time as the pilot solenoid valve 25 is closed, and the wastewater from the reheating circulation line 3 side is cut off through the valve hole 50. Prevent entry into the room 16 side.

In the above embodiment, when the edging chamber 16 is opened to the atmosphere, first, the valve 37 is moved upward in conjunction with the upward play movement in the gap 43 of the valve body 28 to open the pilot valve hole 36, Since the edge cutting chamber 16 is brought to the atmospheric pressure, the engaging piece 40 and the collar 33 are engaged to move the valve 42 upward to open the valve hole 41. The valve hole 41 can be opened by using this. If the pilot valve hole 36 and the valve 37 are not provided, when the valve 42 is opened, the rim cutting chamber 16 has a higher water pressure than the drainage chamber 17 at atmospheric pressure, and therefore this pressure difference causes The valve 42 is pushed downward to act to close the valve hole 41, and when opening the valve hole 41, a spring 44 having a strong restoring force that overcomes the pressure difference must be used. When the solenoid valve 25 is opened to fill water, there is a problem that the valve pressure cannot be closed by pressing down the valve 42 by using the water pressure of the hot water that has entered the valve hole passage 24. As described above, by providing the pilot valve hole 36 and the valve 37, first opening the pilot valve hole 36 to eliminate the pressure difference, and then opening the valve hole 41, the restoring force of the spring 44 is reduced. And the restoring force of the spring 44 It is possible to solve the problem caused by the strong.

Further, in the present embodiment, the tubular member 34 is extended upward from the valve 42 side, and the flange 33 is provided on the extension tip side of the tubular member 34 so that the flange 33 engages with the engagement piece 40 on the valve body 28 side. Since the holding position is near the lower side of the seal member mounting part of the valve body 28 and is located above the bottom surface of the edging chamber 16, the water flow through the edging chamber 16 during the pouring of hot water into the bathtub. It is possible to reliably prevent the valve 42 from being opened by the pushing force of the.

That is, during the pouring of hot water into the bathtub, as shown by the broken line in FIG. 3, the water flow entering the edging chamber 16 from the valve hole passage 24 side moves to the bottom side along the side wall of the edging chamber 16. There is a problem that a swirling water flow is generated from the bottom side toward the upper side, and the swirling upward water flow is received by the collar 33 side and the valve 42 is opened (atmosphere release valve 27 is held by valve 37). However, if the area of this presser is small, there is a case where the presser part tilts around the presser part as a fulcrum, and the phenomenon that the valve hole 41 is opened) occurs, but as in the present embodiment, the collar 33 By arranging the engagement holding portion between the engagement piece 40 and the engagement piece 40 at a position separated upward from the bottom surface of the edging chamber 16, the force of the upward water flow is received at the position where the force of the swirling water flow is weakened. , Upward pushing of the upward flow of water against downward pushing force due to water pressure Force becomes sufficiently small force, not to open the valve 42 by the water flow upward pushing force of the swirl-like, in the hot water dropped into operation to the bathtub, it is possible to maintain the valve 42 to ensure that the closed state.

Moreover, in the present embodiment, the water pressure receiving surface of the collar 33 (the lower surface of the collar 33) is located below the collar 33 by the engagement piece 40 protruding inward from the skirt-shaped wall plate 39. The engagement piece 40 guards the upward force of the water flow from directly hitting the collar 33, so that the upward force of the water flow can be more reliably prevented from acting on the collar 33. It becomes possible to more reliably prevent the phenomenon of being opened by the force of the flow.

Further, in this embodiment, since the skirt-shaped wall plate 39 that extends outward and extends downward is provided below the sealing member 30 that is the sealing portion (closing portion) of the valve body 28. Since the surface 70 of the overhanging portion, which is orthogonal to the valve hole passage 24, functions as a pressure receiving surface for receiving the downward water flow, even if the amount of water dropped by the water filling is small, a large force that pushes the valve body 28 downward. As a result, even if the amount of dropped water is small, the valve body 28 can be immediately pushed down and the valve hole 41 can be closed by the valve 42 so that tap water pressure is applied to the edging chamber 16. Therefore, when pouring the hot water into the bathtub, it is possible to immediately prepare the pouring water for tap water pressure and quickly drop the hot water into the bathtub.

Further, in this embodiment, since the passage 45 that connects the edging chamber 16 and the upper chamber 46 of the discharge valve chamber 18 is provided below the outlet side closing surface of the valve hole passage 24, the filling of water is prevented. In doing so, the first check valve 26 can be easily pushed down by the water pressure. If the passage 45 is provided above the closing surface of the first check valve 26, a stagnation portion is generated on the upper side of the passage 45, and the pressure in the passage 45 increases, and this pressure is increased by the first check valve. Since it acts in the direction of closing the stop valve 26, when the pilot solenoid valve 25 is opened and the hot water on the water heater side enters the valve hole passage 24, the tap water of the hot water causes the first check valve 26, In other words, it is difficult to push the valve body 28 downward, but by providing the passage 45 below the closing surface of the first check valve 26 as in the present embodiment, the stagnation in the passage 45 occurs. Since no part is generated, and therefore no force is generated from the passage 45 side in the direction of closing the first check valve 26, the first check valve 26 can be easily moved downward by the tap water pressure when filling water. It becomes possible to push down to, and it becomes possible to perform the filling operation smoothly.

Further, since the negative pressure stop valve 51 is provided in the discharge valve chamber, when the pilot solenoid valve 25 is closed to stop the water flow of the water filling, the negative pressure stop valve 51 is closed to make the water filling. It is possible to prevent air from entering the pipe 56. Therefore, when the water level sensor 67 is provided in the water filling pipe 56, the water level sensor 67 causes the water to enter the bathtub by the air entering the water filling pipe 56. It is possible to prevent the problem that the malfunction of the water level detection occurs.

Further, when the bathtub 1 is provided above the appliance (hot water supply device), for example, when the hot water supply device is provided on the first floor of the home and the bathtub 1 is provided on the second floor of the home, The second check valve 54 prevents the dirty water on the bath tank 1 side from entering the edging chamber 16 side, which is safe in terms of hygiene. In this case, even if the first check valve 26 and the second check valve 54 fail and the wastewater on the bathtub 1 side enters the edging chamber 16 side, this sewage flows from the edging chamber 16 to the drainage chamber 17 side. When the float 58 gets in and the float 58 rises to a predetermined water level, an ON signal is output from the reed switch to start the circulation pump 2, close the electric two-way valve 64, and open the solenoid valve 63. The sewage collected in the drainage chamber 17 will be forcibly reheated by the circulation pump 2 and returned to the bathtub 1 side through the forward pipe 69 of the circulation pipeline 4, and the sewage on the bath tank 1 side will flow back to the water heater side. There is no. Further, in this case, even when the circulation pump 2 cannot be started due to a power failure or the like, when the level of the sewage collected in the drainage chamber 17 exceeds the upper end opening of the overflow pipe 60, the overflow pipe 60 is discharged to the outside. In any case, it is perfect to ensure that the sewage side and the clean water side are trimmed in the trimming chamber 16 and that the sewage on the bathtub 1 side flows back to the water heater on the tap water side. To be prevented.

It should be noted that the present invention is not limited to the above-mentioned embodiments, and can take various modes.

[0038]

[Effect of the invention]

 When the hot water is dropped into the bathtub, the present invention pushes the check valve downward by receiving the water pressure of the hot water supply, and the atmospheric release valve moves downward integrally with the downward movement of the check valve. Since the air valve provided in the rimming chamber is closed, tap water pressure can be applied to the rimming chamber by closing the air valving port. It is possible to quickly drop hot water into the bathtub from the side.

When the hot water is not dropped into the bathtub, the check valve is pushed upward by the upward biasing force of the spring to close the inflow valve port of the edging chamber. In conjunction with the upward movement, the atmosphere release valve is moved upward to open the atmosphere valve port of the edging chamber to separate the tub side and the water heater side, so that even if sewage from the bath side flows backwards. The sewage on the bathtub side can be prevented from being cut off and flowing into the water heater side. In this case, even if the check valve breaks down, the sewage on the bathtub side that flows back into the rimming chamber is discharged from the open air valve opening, so the water supply is cut off and the passage on the hot water supply side becomes negative pressure. Even if it does, it is possible to reliably prevent the dirty water on the bathtub side from entering the water heater side, which is safe in terms of hygiene.

Further, in the present invention, since the check valve holds the atmosphere release valve through the play gap of vertical relative movement, this play gap is utilized at the end of dropping the hot water into the bathtub. The check valve is moved upwards, the pilot valve hole of the atmospheric release valve is opened before the atmospheric release valve opens the atmospheric valve opening, and the edge chamber is brought to atmospheric pressure. Since it is designed to move upward in conjunction with the above, and open the atmosphere valve opening, the spring that pushes up the check valve and the atmosphere release valve upward can be made to have a small force, that is, a small restoring force. As a result, at the start of pouring hot water, even with a small hot water supply pressure, that is, even with a small amount of pouring water, the check valve can be pushed down reliably to open the inlet valve port and close the atmospheric valve port. Say you can The effect is obtained.

Particularly, in the structure in which the skirt-shaped wall plate is provided so as to project from the valve body of the check valve to the outside, the part of the surface projecting to the outside serves as a pressure receiving surface for receiving hot water pressure. As a result, it is possible to obtain a larger push-down force of the check valve, which ensures that the check valve is pushed down to open the inflow valve opening even if the amount of water dropped is small, and the atmospheric release valve is used to open the atmosphere. The excellent effect that the valve opening can be surely and quickly closed is obtained.

Further, the holding portion for holding the atmosphere opening valve by the check valve is provided in the vicinity of the lower side of the inflow valve port closing portion of the check valve, that is, at the position separated upward from the bottom surface of the edging chamber. In that case, even if the atmosphere opening valve receives the force of the upward upward swirling water flow from the bottom side of the closing chamber in the cutting chamber during the pouring operation of the hot water, the upward flow of water does not Since it is located away from the bottom of the chamber, the force of the upward water flow is received at the position where the momentum of the water flow is weakened.Therefore, the atmosphere release valve receives the force of the upward water flow and opens the atmosphere valve opening. It is possible to prevent it from being moved in the opening direction, and it is possible to reliably maintain the closure of the atmospheric valve opening during the whole period of dropping the hot water.

In addition, the holding portion of the atmosphere release valve by the check valve is configured such that the lower surface of the flange that is formed to extend to the atmosphere release valve is engaged with the engaging piece that extends from the check valve. Since the swirling upward water flow in the slicing chamber during the drop-in is guarded by the engaging piece on the check valve side, it is possible to directly suppress the action on the collar that functions as the pressure receiving surface of the atmosphere release valve. The problem that the upward force of the swirling water flow acts on the flange of the atmosphere release valve to open the atmosphere valve port can be prevented.

Furthermore, by integrally connecting the main valve chamber to the upper side of the edging chamber, the valve mechanism of the check valve and the main opening / closing valve is unitized, so that the backflow prevention device can be made compact and the device can be installed. It becomes easy to handle such as.

Furthermore, by integrally connecting the drainage chamber to the lower side of the edging chamber, it is possible to receive the drainage from the edging chamber and prevent it from being discharged to the floor surface, etc. It becomes easy to construct a system that drains the water to the bathtub side.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an embodiment of a backflow prevention device for a bath according to the present invention in a system of an automatic bathtub.

FIG. 2 is a detailed explanatory view of a valve mechanism portion of the backflow prevention device for a bath in the same embodiment.

FIG. 3 is an explanatory diagram of an operation state of an atmosphere release valve at the time of flowing water in the embodiment.

FIG. 4 is an explanatory diagram showing a backflow prevention device for a former bath in a system of an automatic bathtub.

[Explanation of symbols]

 1 Bath 15 Main valve chamber 16 Edge cut chamber 17 Drain chamber 25 Pilot solenoid valve 26 First check valve 27 Atmosphere opening valve 32 Body 36 Pilot valve hole 37 Valve (pilot valve) 42 Valve 44 Spring

Claims (5)

[Utility model registration claims] 1. A backflow prevention device for a bath, which is provided in a hot water supply passage for guiding hot water produced by a water heater to a bathtub, and performs an edge cut between the water heater side and the bathtub side, wherein the backflow prevention device includes an edge cutting chamber, A drainage chamber containing an overflow pipe is integrally connected to the lower portion of the rim cutting chamber, and an inflow valve port into which hot water from the water heater side flows is provided at an upper side of the rim cutting chamber and a drainage chamber is provided at a lower side thereof. An atmosphere valve opening communicating with the chamber is provided on each side, and an outlet for flowing hot water passing through the rim cutting chamber to the bath side is provided on each side, and a check valve for opening and closing the inflow valve opening in the rim cutting chamber, and the reverse valve. An atmosphere release valve, which is arranged on the lower side of the stop valve and opens and closes the atmosphere valve opening, and a spring, which urges the check valve upward to close the inflow valve opening, are accommodated. It is held by the valve through a play gap of vertical relative movement and linked with the check valve. Closing the inflow valve opening by the check valve and opening the atmosphere valve opening by the atmosphere opening valve by moving the check valve upward, and opening the inflow valve opening and the atmosphere opening valve by the check valve by moving down the check valve The atmosphere release valve is closed with a pilot valve hole that connects the drainage chamber and the edging chamber, and the pilot valve hole is opened and closed on the lower end side of the check valve. A pilot valve is provided, and the pilot valve is closed by the pilot valve by downward movement of the check valve, and the pilot valve hole is opened by the pilot valve by the upward movement of the check valve in the play gap. A backflow prevention device for a bath, characterized in that it is configured before the opening valve is opened. 2. A backflow prevention device for a bath, which is provided in a hot water supply passage for guiding hot water produced by a hot water supply device to a bathtub and performs an edge cut between the water heater side and the bathtub side, wherein the backflow prevention device includes an edge cutting chamber, A main valve chamber communicating with a hot water supply passage on the water heater side is integrally connected above the rim cutting chamber, and a main opening / closing valve for opening and closing a passage communicating with the rim cutting chamber is disposed in the main valve chamber, An inlet valve for hot water from the main valve chamber side flows into the upper part of the rimming chamber, an atmospheric valve port communicating with the atmosphere is in the lower part, and hot water flowing through the rimming chamber flows out to the bath side on the side part. A check valve for opening and closing the inflow valve port, an atmosphere release valve for opening and closing the atmosphere valve port, which is arranged on the lower side of the check valve, and the check valve. And a spring that closes the inflow valve opening by urging the The air release valve is held by the check valve through a play gap of relative movement in the vertical direction and interlocks with the check valve, and the check valve is moved upward to close the inlet valve port by the check valve and the atmospheric valve by the atmosphere release valve. The pilot is configured to open the mouth, open the inflow valve opening by the check valve by moving the check valve downward, and close the atmosphere valve opening by the atmosphere opening valve, and communicate with the atmosphere in the atmosphere opening valve. A valve hole is formed,
A pilot valve that opens and closes the pilot valve hole is provided on the lower end side of the check valve, and the pilot valve is closed by the downward movement of the check valve.
A backflow prevention device for a bath, wherein a pilot valve hole is opened by a pilot valve before the atmosphere opening valve is opened by upward movement of the check valve in the play gap. 3. The atmosphere release valve is held by a check valve having a fitting portion that is vertically slidable, and the holding portion is near a lower side of an inflow valve port closing portion of the check valve. The backflow prevention device for a bath according to claim 1 or 2, which is provided at a position. 4. The atmosphere release valve is held by a check valve having a fitting portion that is vertically slidable, and the holding portion is
The backflow of the bath according to claim 1, 2 or 3, characterized in that the lower surface of the brim formed overhanging the atmosphere release valve is engaged and held by an engagement piece extending from the check valve. Prevention device. 5. A backflow prevention device for a bath, which is provided in a hot water supply passage for guiding hot water produced by a hot water supply device to a bathtub, and performs edge cutting between the water heater side and the bathtub side, wherein the backflow prevention device includes an edge cutting chamber, The upper part of this rimming chamber has an inlet valve port through which hot water from the water heater side flows, the lower part has an atmosphere valve port that communicates with the atmosphere, and the side part discharges hot water that passes through the rimming chamber to the bathtub side. Each of the outlets is provided, and a check valve for opening and closing the inflow valve port is provided in the edging chamber, an atmosphere release valve that is disposed below the check valve and opens and closes the atmosphere valve port, and the check valve. A spring for urging upwardly to close the inflow valve opening is accommodated, and the check valve has a central shaft-shaped body at a position below the closing portion of the inflow valve opening, and an outward projection of the body. And a skirt-shaped wall plate that extends downward along the side wall of the edging chamber. An engagement piece protruding toward the body portion is fixedly formed inside the skirt-shaped wall plate, and a flange protruding outward is formed at an upper portion of the atmosphere release valve, and a relative vertical movement is made below the flange. The engagement piece is engaged through a play gap that enables the atmosphere release valve is held by the check valve,
The atmosphere opening valve is interlocked with the check valve by the engagement of the collar and the engaging piece, and the upward movement of the check valve closes the inlet valve opening by the check valve and opens the atmosphere valve opening by the atmosphere opening valve. The check valve is moved downward to open the inflow valve opening by the check valve and the atmosphere valve opening is closed by the atmosphere opening valve, and the atmosphere opening valve has a pilot valve hole communicating with the atmosphere in the rimming chamber. A pilot valve that opens and closes the pilot valve hole is provided on the lower end side of the body of the check valve, and the pilot valve is closed by the downward movement of the check valve. A backflow prevention device for a bath, characterized in that a pilot valve hole is opened by a pilot valve before the atmosphere opening valve is opened by upward movement of the valve within the play gap.