JPH077662Y2 - Valve body installation structure of thermostatic type mixing valve - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention is configured to move a valve body forward and backward so as to reach a set mixed water temperature by a temperature sensing element that senses the water temperature of the mixed water and expands and contracts. The present invention relates to a thermostat type mixing valve. Specifically, the present invention relates to improvement of the valve body installation structure of the mixing valve.

[Prior Art] A temperature sensor is inserted into a cylindrical valve casing having a water inlet, a hot water inlet, and a mixed water outlet so that the temperature of the mixed water reaches a set temperature by expanding and contracting the temperature sensor. Thermostatic mixing valves that adjust the mixing ratio of hot and cold water by advancing and retracting the valve body have been widely used. This valve body is installed so as to partition the water inlet and the hot water inlet provided in the casing and the mixed water chamber below the valve body.

[Problems to be Solved by the Invention] Generally, the water pressure of the water supply pipe and the hot water supply pipe connected to this kind of hot and cold water mixing valve is higher than that of the water absorption pipe. (The water pressure of the hot water supply pipe is low due to the presence of the water heater on the upstream side.) Therefore, the water pressure of the water exceeds the water pressure of the hot water in this mixing valve, and the hot water enters the mixing water chamber. There was a risk that it would not flow easily.

[Means for Solving the Problems] The valve body installation structure of the thermostatic mixing valve according to the present invention has a temperature sensing body and a valve in a tubular valve casing having a water inlet, a hot water inlet and a mixed water outlet. The present invention relates to a valve body installation structure of a thermostat type mixing valve in which a body is inserted and the valve body is advanced and retracted by expansion and contraction of the temperature sensitive body so that a mixing ratio of hot and cold water is adjusted to a set temperature.

The valve body has a substantially columnar shape or a cylindrical shape, and a flange portion that is in sliding contact with an inner peripheral surface of the valve casing is provided on an outer peripheral surface of the valve body, and a valve of the flange portion of an outer peripheral portion of the valve body is provided. One of the body axis directions is a water chamber, the water chamber communicates with the water inlet, and the other of the outer peripheral portions of the valve body in the valve body axis direction is a hot water chamber. The hot water chamber communicates with the hot water inlet.

The collar portion has a trapezoidal cross-sectional shape that expands toward the outer peripheral side, and outer edges of the collar portion on both sides in the valve body axial direction are valve body seat portions.

The valve body is provided with communication passages that connect the water chamber and the hot water chamber on both sides in the axial direction of the collar portion.

The water chamber communicates with the mixed water outlet so that hot water from the hot water chamber flows into the water chamber through the communication passage and then to the mixed water outlet.

The opening of the end of the communication passage facing the water chamber is located on the side away from the flange in the axial direction of the valve body with respect to the outer edge of the flange.

The root portion of the collar portion on the water chamber side is formed by a curved surface that is concavely curved.

[Operation] In the valve body installation structure of the present invention, the hot water flows from the hot water inlet into the hot water chamber on one side of the flange portion of the valve body in the direction of the valve body axis, and passes through the communication passage of the valve body. Flows into the water chamber on the other side of the section. Water flows directly into the water chamber on the other side of the collar. This water is
It flows along the side surface of the collar portion, the flow direction is changed to the valve element axial direction by the concave curved surface of the root portion of the collar portion, and it flows along the valve element as it is. An opening at the end of the communication passage is provided in the middle of the flow along the valve body. Therefore, the hot water flowing out from this opening is drawn into the water flow by an action such as the Venturi effect. Therefore, even if the water pressure exceeds the water pressure of the hot water, the hot water is reliably supplied to the mixed water chamber.

Embodiments Embodiments will be described below with reference to the drawings.

FIG. 1 is a front view of a thermostat type mixing valve adopting the embodiment structure of the present invention, and the lower half is shown in cross section.
FIG. 2 is a left side view of FIG.

Reference numeral 10 is a substantially cylindrical valve casing, one end side of which is sealed with an end cap 12 and the other end side of which is a flange 14
Is provided. The valve casing 10 is provided with a mixed water outlet 16 at a substantially central portion thereof, and a first inlet 18 for allowing hot water to flow into the one end side at different axial positions. Second inlet for water flow
20 are drilled.

A substantially cylindrical inner barrel 22 is slidably inserted into the valve casing 10. The inner barrel 22
Has two sliding portions 24 and 26, and the sliding portion 24 is slidable on the inner peripheral surface of the valve casing 10 between the second inlet 20 and the mixed water outlet 16. Touches. Sliding part
Reference numeral 26 is slidably in contact with the inner peripheral surface of the valve casing 10 on the other end side of the mixed water outlet 16. The outer peripheral surface of the inner barrel 22 is slightly recessed between the sliding portions 24 and 26, and an outflow chamber 28 is formed between the valve casing 10 and the inner barrel 22.

A valve body 30 is inserted into the one end side of the valve casing 10. The valve body 30 has a substantially cylindrical shape, and a flange portion 32 is provided on an outer peripheral surface of the valve body 30, and an outer peripheral circle of the flange portion 32 is provided on a valve body holding portion 34 provided on the inner peripheral surface of the valve casing 10. It is slidably in contact with it. A valve body inlet port 36 and a circular body outlet port 38 are bored in the valve body 30 so as to communicate the inside and the outside thereof, and the portion on the other end side of the valve body outlet port 38 is the end plate portion. It is sealed at 40. The flange portion 32 has a trapezoidal cross-sectional shape in which the width increases toward the outside, and both end portions in the axial direction are valve body seat portions 32a and 32b. Further, the valve body outlet 38 is provided at a position farther from the collar portion 32 than the valve body seat portion 32a in the valve body axial direction (leftward in FIG. 1). Of the outer peripheral portion of the valve body 30, the collar portion 32
1 shows a water chamber on the left side and a hot water chamber on the right side. The valve body inlet port 36, the inside of the valve body 30, and the valve body outlet port (opening) 38 form a communication passage that connects the hot water chamber and the water chamber. The valve body outlet 38 is an opening at the end of the communication passage. A root portion 32T of the flange portion 32 on the valve body seat portion 32a side is formed by a curved surface that is smoothly concavely curved.

Valve seat members 44, 46 with which the valve seat portions 32a, 32b abut
Are arranged on both sides of the collar portion 32. The valve seat member 44 includes a ring-shaped holder 44a that is fitted and fixed to one end of the inner barrel 22 and a rubber packing 44b that is held by the holder 44a. The valve seat member 46 includes a ring-shaped holder 46a that is internally fitted and fixed to the end cap 12, and a rubber packing 46b that is held by the holder 46a. In addition,
The end cap 12 has a cylindrical portion 12a that is inserted into the one end side of the valve casing 10, and a screw is engraved on the outer peripheral surface of the cylindrical portion 12a and the inner peripheral surface of the valve casing 10, respectively. The end cap 12 is screwed and fixed to the one end of the valve casing 10.

A temperature sensitive body 50 is inserted in the inner barrel 22. The temperature sensing body 50 has a body portion 50a whose outer peripheral surface slides on the inner circumference of the inner barrel 22, a temperature sensing portion 50b extending from the body portion 50a to the one end side of the valve casing 10, and a body portion 50a. Is provided with a rod 50c extending to the opposite side, and a material, such as wax, whose volume is increased / decreased according to temperature rise / fall is enclosed therein. When the material expands, the rod 50c projects from the main body 50a, and when the material contracts, the rod 50c moves in the direction in which the material is retracted into the main body 50a by the reaction force of the return spring 76.

A flow adjusting shaft 52 is inserted from the other end side of the valve casing 10. The flow adjustment shaft 52 is disposed outside the valve casing 10 and has a handle mounting portion 54 with serration formed on the outer peripheral surface thereof, and is integrated with the handle mounting portion 54 and is disposed between the valve casing 10 and the inner barrel 22. It has a tubular portion 56 to be inserted. The outer peripheral surface of the cylindrical portion 56 is slidable with the valve casing 10, and a screw is engraved on the inner peripheral surface of the cylindrical portion 56, and is screwed with the screw engraved on the outer peripheral surface of the inner barrel 22. is doing. Therefore, when the flow adjustment shaft 52 is rotated, the inner barrel 22 is moved back and forth in the axial direction. A screw 55 is screwed into the valve casing 10, the tip of the screw 55 is engaged with a slit 57 formed in the inner barrel 22, and the inner barrel 22 is prevented from rotating together with the flow adjustment shaft 52. The inner barrel 22 can be moved back and forth. Further, a step portion 59 is provided on the inner peripheral surface of the valve casing 10 so that the tip end of the cylindrical portion 56 abuts on the inner surface of the valve casing 10 to define the forward limit of the flow adjustment shaft 52.

A temperature adjusting shaft 58 is provided so as to penetrate the axial center of the flow adjusting shaft 52. The temperature adjusting shaft 58 has a handle mounting portion 60 which is arranged outside the valve casing 10 and has serrations engraved on its outer peripheral surface, and an insertion portion 62 which is integrated with the handle mounting portion 60 and is inserted into the valve casing 10. is doing. A serration extending in the axial direction is formed on the outer peripheral surface of the insertion portion 62.
62a is engraved. This insert 62 and inner barrel 2
A rotary cylinder 64 is arranged between the two. A screw is engraved on the outer peripheral surface of the rotary cylinder 64, and is engaged with the screw engraved on the inner peripheral surface of the inner barrel 22. The rotary cylinder 64 has a flange portion 66 that protrudes inward, and a serration 66a that engages with the serration 62a of the insertion portion 62 is provided on the inner peripheral surface of the flange portion 66 to control the temperature. When the shaft 58 is rotated, the rotary cylinder 64 rotates together, and is guided by the screw of the inner barrel 22 to move the rotary cylinder 64 forward and backward in the axial direction.

A plug 68 is installed so as to cover the rod 50c of the temperature sensitive body 50. The plug 68 includes a flange portion 70, and the flange portion 70 slidably contacts the inner peripheral surface of the rotary cylinder 64. A relief spring 72 is interposed between the flange portion 70 and the flange portion 66 of the rotary cylinder 64, and the flange portion 70 of the plug is attached to an E ring 74 attached to the inner peripheral surface of the rotary cylinder 64. It is pressed.

The tip of the temperature sensing part 50b is fitted to the end of the valve body 30 and is slidably held. In addition, the collar portion of the valve body 30
Return spring 76 between 32 and end cap 12
Is interposed to urge the valve body 30 to the left in the figure.

Other configurations will be described from the left side of FIG. 1.
Reference numeral 78 is an E-ring, which sandwiches the flow adjustment shaft 52 with the flange portion 80 of the temperature adjustment shaft 58 to prevent the temperature adjustment shaft 58 from coming off. Reference numeral 82 is a stop ring for preventing the flow adjustment shaft 52 from coming off, and is inserted into a slit 84 provided in the valve casing 10. A slip washer 86 is arranged inside the stop ring 82. A slip washer 88 is also interposed between the tip surface of the tubular portion 56 and the step portion 59 of the valve casing 10.

O-rings 90 and 92 are provided at the sliding portions between the inner peripheral surface of the valve casing 10 and the outer peripheral surface of the inner barrel 22, respectively, and the O-rings 90 and 92 are provided, respectively, and the outer peripheral surface of the flange portion 32 of the valve body 30 and the valve body holding portion 34. An O-ring 94 is also provided between them. O-rings 96, 98, 100 are provided on the outer peripheral surface of the valve casing 10, respectively.

Further, strainers 18A and 20A each having a mesh shape formed in a ring shape are attached to the inflow ports 18 and 20, respectively.

The operation of the thermostat type hot and cold water mixing valve configured as described above will be described below. The state shown in FIG. 1 is in a water shutoff state with the valve fully closed. In this state, when the flow adjusting shaft 52 is rotated, the inner barrel 22 is moved leftward in the drawing due to the meshing of the screws. Further, as the inner barrel 22 moves, the rotary cylinder 64 also moves to the left in the figure by the same distance. With the movement of the inner barrel 22 to the left, the gap between the packing 44b of the valve seat member 44 and the valve body seat portion 32a of the valve body 30 opens, and the water from the inflow port 20 mixes in the inner barrel 22. Flows into chamber 102. On the other hand, when the rotary cylinder 64 moves to the left in the figure as described above, the temperature sensing element 50 and the valve element
Since the return springs 76 are respectively pressed to the left in the figure, the temperature sensing element 50 and the valve element 30 also move to the left in the figure. Therefore, the valve seat portion 32b and the valve seat member 46
And the hot water flows into the mixing chamber 102 through the inlet 18, the valve body inlet 36, the inside of the valve body 30, and the valve body outlet 38. The water temperature in the mixing chamber 102 is sensed by the temperature sensing unit 50b of the temperature sensing body 50, and the valve body 30 is positioned so as to reach a preset mixed water temperature. That is, the projecting pressure of the rod 50c of the temperature sensitive body 50 and the pressing force of the return spring 76 move the valve body 30 forward and backward so that they are balanced.
As a result, the valve body 30 is positioned so that the water temperature in the mixing chamber 102 reaches the set temperature, and the valve body seat portions 32a, 3
The distance between the 2b and the packings 44b and 46b is adjusted. For example, if the water temperature in the mixing chamber 102 is higher than the set temperature, the rod 50c projects, the valve body 30 is moved to the right in the figure, and the gap between the valve body seat portion 32b and the packing 46b is narrowed, The mixing chamber 10
Reduce the water temperature in 2 to the target temperature. On the contrary, when the water temperature in the mixing chamber 102 is lower than the set temperature, the rod 50c retracts, and the main body portion 50a and the temperature sensitive portion 50b of the temperature sensitive body 50 move leftward in the figure. As a result, the valve body 30 also moves to the left in the figure, the space between the valve body seat portion 32a and the packing 44b is narrowed, the inflow amount of water from the inflow port 20 is reduced, and conversely the hot water from the inflow port 18 is reduced. And the water temperature in the mixing chamber 102 is increased so as to approach the set temperature.

The valve seats 32a and 32b and the packing 44 are moved to the extent that the inner barrel 22 is moved to the left in the figure by operating the flow control shaft 52.
The distance between b and 46b increases, and the water flow rate increases. On the contrary, the amount of water flow decreases as the inner barrel 22 is moved to the right in the figure.

When the temperature adjusting shaft 58 is rotated, the rotary cylinder 64 is also rotated, and the rotary cylinder 64 is moved back and forth in the left-right direction in the drawing due to the engagement of the screws. As the temperature sensing body 50 is moved to the right in the figure, the gap between the valve body seat portion 32b and the packing 46b is narrowed, and the flow rate of hot water is reduced. Therefore, the set mixed water temperature becomes a low value. On the contrary, as the temperature sensing element 50 is positioned to the left in the figure, the flow rate of hot water increases and the flow rate of water decreases, and the target set water temperature becomes higher. The mixed water is the inner barrel 22
It flows out of the outflow port 16 through the opening 104 and the outflow chamber 28 provided in the.

Thus, in the present embodiment, as described above, the hot water flows in from the valve body seat portion 32b side of the valve body 30, passes through the inside of the valve body 30, and flows out from the valve body outlet 38. Water is the valve seat 32a
And flows along the side surface of the flange portion 32, changes the flow direction to the axial direction of the valve body 30 by the concave curved surface of the root 32T portion of the flange portion 32, and flows along the valve body as it is. A valve body outlet 38 is provided in the middle of the flow along the valve body. Therefore, the hot water flowing out from the valve body outlet 38 is drawn into the water flow by an action such as the Venturi effect. Therefore, even if the water pressure exceeds the water pressure of the hot water, the mixed water chamber 102
Hot water is reliably supplied. Further, since the position of the valve body outlet 38 is set to be farther from the flange 32 than the valve body seat portion 32a, the water flowing from the portion of the valve body seat portion 32a directly hits the valve body outlet 38. It doesn't flow like you do. Therefore, the flow of water in the vicinity of the valve body outlet 38 becomes a flow along the side peripheral surface of the valve body 30 as described above, and a smooth flow of hot water is secured.

[Effect] As described above, according to the valve body installation structure of the present invention, the hot water smoothly flows into the mixed water chamber, so that the hunting phenomenon of the temperature sensing element is also prevented, and the mixed water at the temperature that is equal to the target temperature is prevented. Is stably discharged.

[Brief description of drawings]

FIG. 1 is a front view of a thermostatic mixing valve according to an embodiment of the present invention, and FIG. 2 is a left side view. 10 ... Valve casing, 12 ... End cap, 16 ...
… Mixed water outlet, 18 …… first inlet, 20 …… second inlet, 22 …… inner barrel, 30 …… valve, 32 …… collar part, 32a, 32b …… valve seat part , 44, 46 ... Valve seat member,
50: Temperature sensor, 52: Flow control axis, 58: Temperature control axis, 64: Rotating cylinder.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor, Jun Ishihara, 1-1, Kyowa-cho, Obu-shi, Aichi Prefecture Within Aisan Industry Co., Ltd. (72) In-house, Tsuguo Uemura, 1-1, Kyowa-cho, Obu, Aichi 1 Aisan Kogyo Co., Ltd. (56) Reference JP-A-50-16924 (JP, A) Actually opened 55-103712 (JP, U) Actually opened 63-48080 (JP, U) Actually opened 62- 50385 (JP, U)

Claims (1)

[Scope of utility model registration request] 1. A temperature sensing element and a valve element are inserted into a cylindrical valve casing having a water inlet, a hot water inlet and a mixed water outlet, and the valve element is advanced and retracted by expansion and contraction of the temperature sensing element. In a valve body installation structure of a thermostatic mixing valve in which the mixing ratio of hot and cold water is adjusted so that the temperature of the mixed water becomes a set temperature, the valve body has a substantially columnar shape or a cylindrical shape, and the outer peripheral surface thereof has the valve. A flange portion is provided so as to be in sliding contact with the inner peripheral surface of the casing, and one of the outer peripheral portions of the valve body in the valve body axial direction is a water chamber. The hot water chamber is communicated with the inlet, and the other of the outer peripheral portions of the valve body in the axial direction of the valve body is a hot water chamber, the hot water chamber is communicated with the hot water inlet, and the collar portion is It has a trapezoidal cross-sectional shape that expands toward the outer peripheral side, and the outer edges of the collar portion on both sides in the valve body axial direction are the valve body seat portion. The valve body is provided with a communication passage that connects the water chamber and the hot water chamber on both sides in the axial direction of the collar portion, and hot water from the hot water chamber passes through the communication passage to the water chamber. The water chamber communicates with the mixed water outlet so that the water flows into the mixed water outlet and then flows to the mixed water outlet, and the communication passage end opening where the communication passage faces the water chamber has a valve body shaft more than an outer edge of the collar portion. A valve body for a thermostatic mixing valve, characterized in that it is located on the side away from the collar portion in the direction of the core line, and the root portion of the collar portion on the side of the water chamber is composed of a curved surface that is concavely curved. Construction.