JPH08159558A - Combustion equipment with hot water supply function - Google Patents

Abstract

PURPOSE: To prevent occurrence of water hammer at the time of starting a filling of hot water and further to perform a positive water removal of a passage in a combustion equipment. CONSTITUTION: A hot water feeding heat exchanger 4 and an additional boiling heat exchanger 5 are arranged side by side within a case 3 of a combustion equipment 2 and further a hot water feeding passage 20 is connected to an output part of the hot water feeding beat exchanger 4. An outlet of the passage 20 projects out of a case 3 of the combustion device 2 and a joint member 10b is connected to the outlet. A water drain plug is removably installed at the joint member 10b so as to make an integral assembly of a check valve to the water drain plug.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot water supply combustor having a hot water supply heat exchanger with a hot water supply passage connected to a branch passage for filling and pouring water.

[0002]

2. Description of the Related Art FIG. 5 shows a conventional general hot water supply system capable of filling and pouring water into a bathtub 1. The appliance 2 of the combustion equipment of this hot water supply system is known as an automatic bath kettle (combined water heater), and a hot water supply heat exchanger 4 and a reheating heat exchanger 5 are arranged side by side in a case 3 of the appliance 2. ing.

An inlet side pipe line 6 is connected to the inlet side of the reheating heat exchanger 5, and an outlet side pipe line 7 is connected to the outlet side of the reheating heat exchanger 5 in the instrument. The inlet side pipeline 6 and the return side external pipeline 8 are connected via a joint member 10c, and the outlet side pipeline 7 and the forward side external pipeline 11 are connected via a joint member 10d. There is. The inlet side of the return side external pipeline 8 and the outlet side of the forward side external pipeline 11 are connected to the side wall of the bathtub 1 via the circulation metal fitting 12, and the return side external pipeline 8 and the inlet side pipeline 6 are connected. The reheating heat exchanger 5, the outlet side pipeline 7, and the outward side external pipeline 11 form a reheating circulation pipeline 13 that circulates the hot and cold water in the bathtub 1, and the inlet side pipeline 6 has A circulation pump 14 that circulates the bath water is incorporated. In addition, the numeral 15 provided in the inlet pipe line 6 is a running water switch for detecting the flow of hot water, and 16 is a bath temperature sensor for detecting the temperature of the hot water in the bathtub 1.

An in-apparatus water supply pipeline 17 is connected to the inlet side of the hot water supply heat exchanger 4, and the in-apparatus water supply pipeline 17 and the external water supply pipeline 18 are connected via a joint member 10a.

On the outlet side of the hot water supply heat exchanger 4, there is a hot water supply passage in the equipment.
20 is connected, and the hot water supply passage 20 inside the appliance is connected to the hot water supply passage 21 outside the appliance via the joint member 10b. The hot water supply passage 21 outside the appliance is piped to a desired hot water supply place, and various hot water taps, in the example shown in FIG.
And a hot water supply tap 23 composed of a single tap is connected.

There are various forms of the mixed faucet 22. The mixed faucet 22 shown in FIG. 5 is a hot water supply branch pipe line.
Check valve 24 on 19 side, manual open / close valve 25, check valve 26 on water supply branch line 29 side, manual open / close valve 27, and selectively switch hot water and water mixed between shower side and callan side And a switching valve 28 for switching.

In the middle of the hot water supply passage 20 in the appliance, one end side of a branch passage 30 is connected, and the other end side of the branch passage 30 is connected to the inlet side pipe line 6 to connect the hot water supply passage 20 in the appliance and the inlet side. It communicates with the pipeline 6 via a branch passage 30. This branch passage 30
A pouring solenoid valve 31 which functions as an opening / closing control valve is provided in the.

In the figure, 32 is a flow rate sensor for detecting the flow rate of the supplied water, 33 is a water temperature sensor for detecting the temperature of the incoming water, 34 is a hot water temperature sensor for detecting the hot water temperature, and 35 is hot water from the hot water heat exchanger 4. A water amount adjusting valve for adjusting the flow rate, 36 is a bypass passage provided as necessary, and 37 is a pressure sensor for detecting the water level of the hot water in the bathtub 1 by the water pressure.

The hot water supply, hot water filling, and reheating operation of this kind of hot water supply apparatus are controlled by a control device (not shown). In the hot water supply operation, the water supply temperature is set to the set temperature for hot water supply. Therefore, the burner is burned to heat the water passing through the hot water supply heat exchanger 4 with combustion heat to obtain hot water having a preset temperature, and hot water is supplied through the hot water supply passages 20 and 21.

Further, at the time of filling operation, the pouring electromagnetic valve 31 is opened, the hot water produced by the hot water supply heat exchanger 4 is guided to the reheating circulation line 13 through the branch passage 30, and this reheating circulation line
It is poured into the bathtub 1 from 13 and poured when the amount of dropped water detected by the flow rate sensor 32 reaches the set water level (or when the water level in the bathtub 1 detected by the pressure sensor 37 reaches the set water level). The hot water solenoid valve 31 is closed to end the hot water filling operation. In the filling operation, the water supplied from the external water supply conduit 18 is similarly dropped into the bathtub 1 by opening the pouring electromagnetic valve 31 without burning the burner of the hot water supply heat exchanger 4. The bathtub 1 is filled with water.

During the reheating operation, the circulating pump 14 is started with the pouring electromagnetic valve 31 closed, so that the hot and cold water in the bathtub 1 circulates in the reheating circulation pipe line 13. At this time,
By performing the burner combustion of the reheating heat exchanger 5, the circulating hot water is heated when passing through the reheating heat exchanger 5 to be reheated, and the hot water in the bathtub 1 detected by the bath temperature sensor 16 is heated. When the temperature reaches the set temperature of the bath, the circulation pump 14 is stopped to end the reheating operation.

As described above, by the operation control of the control device,
Each operation of hot water supply, hot water filling, and reheating will be automatically performed.

[0013]

By the way, when performing the filling operation in the appliance 2 provided with the above-mentioned direct connection type branch passage 30, normally, the solenoid valve 31 for pouring the water is provided with the hot water tap 23 closed.
When the pouring solenoid valve 31 opens and closes and the pressure in the vicinity of the pouring solenoid valve 31 suddenly changes at this time, an impact is generated between the pouring solenoid valve 31 and the hot water tap 23. However, there is a problem that a so-called water hammer is generated due to the impulsive water pressure applied to the pressure sensor 37, and the water hammer sometimes breaks the pressure sensor 37.

The present inventor has proposed a configuration as shown in FIG. 4 in order to solve the above conventional problems. In this proposal, a check valve for preventing backflow is provided in a portion of the hot water supply passage 20 in the appliance on the downstream side of the connection portion 38 between the hot water supply passage 20 in the appliance and the branch passage 30.
40 is provided, and other configurations are shown in FIG.
This is the same as the conventional example shown in FIG.

In the present proposal, as described above, since the check valve 40 is provided in the hot water supply passage 20 in the appliance on the downstream side of the connecting portion 38 of the branch passage 30, it is possible to mitigate the generated water hammer. This makes it possible to prevent the pressure sensor from being damaged by the water hammer.

By the way, when the instrument 2 is installed in a cold region, in order to prevent the pipeline in the instrument 2 from freezing,
Usually, a water drain plug is installed at the joint members 10a to 10d. In such a case, as shown in FIG. 4, when the check valve 40 is installed on the upstream side of the joint member 10b, the check valve 40 has a resistance to the forward water flow direction, so Even if the water drain plug provided in the member 10b is operated to drain water, the water does not escape from the upstream side of the check valve 40, for example, between the check valve 40 and the connecting portion 38 of the branch passage 30. May freeze. In order to prevent this freezing, a new problem arises in that a new water drain plug must be provided between the connecting portion 38 of the branch passage 30 and the check valve 40.

The present invention has been made in order to solve the above problems, and its purpose is to provide a new water supply in addition to the water drain plug of the joint member even if a check valve is provided by connecting to the hot water supply passage in the appliance. An object of the present invention is to provide a combustion device with a hot water supply function that does not require a separate tap.

[0018]

In order to achieve the above object, the present invention is constructed as follows. That is, the first aspect of the present invention is to provide a hot water supply heat exchanger, a hot water supply passage in the equipment connected to the outlet side of the hot water supply heat exchanger, and a branch passage connected in the middle of the hot water supply passage in the equipment in the equipment case. And an opening / closing control valve provided in the branch passage, and a joint member is provided on the outlet side of the hot water supply passage inside the equipment that has exited from the equipment case, and the hot water supply passage inside the equipment is connected via this joint member. In a combustion device with a hot water supply function that is connected to a hot water supply passage outside the appliance, a detachable water drain plug is provided on the joint member, and a check valve of a check valve composed of a valve body and a valve seat is provided on the water drain plug side. The valve element is built in, and a check valve seat is provided on the flow passage side in the joint member.

According to a second aspect of the invention, a hot water supply heat exchanger, a hot water supply passage in the equipment connected to the outlet side of the hot water supply heat exchanger, and a hot water supply passage in the equipment are connected in the middle of the equipment case. The branch passage and the opening / closing control valve provided in the branch passage are accommodated, and a joint member is provided on the outlet side of the hot water supply passage inside the equipment that has exited from the equipment case. In a combustion device with a hot water supply function in which a hot water supply passage and a hot water supply passage outside the appliance are connected, a detachable water drain plug is provided in the joint member, and the hot water drain passage of the joint member is connected to the hot water supply passage in the appliance. A part of the flow passage that connects the mouth and the connection port of the hot water supply passage outside the appliance is formed by way of the reverse passage, and a valve body and a valve seat are provided in the passage passage of the flow passage in the water drain plug. It is characterized by the built-in stop valve It is configured Te.

[0020]

In the present invention having the above structure, the hot water produced on the hot water supply heat exchanger side is fed from the hot water supply passage through the branch passage by opening the opening / closing control valve. Further, by closing the opening / closing control valve, the hot water supply through the branch passage is stopped. Even when the pressure in the vicinity of the on-off control valve changes abruptly when the on-off control valve opens and closes, this abrupt pressure change is alleviated by the check valve, and the occurrence of water hammer is suppressed.

Further, by removing the water drain plug at night such as in winter, the valve body of the check valve is removed integrally with the water drain plug, so that the water is not only in the passage above the check valve, but also the device. The water in the inner hot water supply passage is smoothly drained without staying, and it is possible to reliably prevent freezing.

[0022]

Embodiments of the present invention will be described below with reference to the drawings. In the description of the present embodiment, the same reference numerals will be given to the same names as those in the conventional example and the proposed example, and duplicate description thereof will be omitted. The combustion apparatus with a hot water supply function of the present embodiment is intended for a combined water heater (automatic bathtub) as in the conventional example and the proposed example, and has the same appliance configuration as the conventional example shown in FIG. A feature of this embodiment is that the check valve 40 and the water drain plug 43 are incorporated in the joint member 10b, and other configurations are the same as those of the conventional example.

FIG. 1 shows an embodiment of a joint member 10b having a check valve 40 and a water drain plug 43 incorporated therein. An inflow passage 44 and an outflow passage 45 are laterally arranged in the main body of the joint member 10b. The inflow passages 44 and the outflow passages 45 are formed so as to be displaced from each other, and are connected to each other through the bent passages 46 that are substantially orthogonal to each other. Connected to the outlet of passage 20, the outflow passage
The outlet side of 45 is connected to the hot water supply passage 21 outside the appliance.

The outlet side of the inflow passage 44 is oriented in a horizontal direction at a right angle, and a valve seat 47 is formed on the passage wall portion on the outlet side of the inflow passage 44 so as to project in the lateral direction.

A fitting cylinder wall 48 into which the water drain plug 43 is inserted and mounted is extended on the extension side of the outlet of the inflow passage 44, and a female screw portion provided on the inner peripheral surface of the fitting cylinder wall 48 on the tip side. Screwed to
A drain plug 43 is detachably attached.

A packing accommodating groove 50 is provided around the outer peripheral surface of the water removing plug 43 on the insertion side, and an O ring 51 is accommodated in the packing accommodating groove 50.
The airtightness (watertightness) between the fitting cylindrical wall 48 and the fitting cylindrical wall 48 is ensured.

A recessed space 52 is formed in the central portion of the water drain plug 43 in the axial direction in the front end side opening. Drainer 43
A locking holding portion 53 is formed inside the tip of the locking holding portion 53. The locking holding portion 53 holds the disc-shaped protruding flange portion 54 by locking, and the bush 55 is housed in the recessed space 52. There is. A valve rod 57 is slidably inserted into a central hole 56 of the bush 55, and a stopper 58 for preventing the slip-out is fixed to an end of the valve rod 57 on the recess space 52 side.

A valve body (valve) 61 is provided on the other end side of the valve rod 57 via a valve body mounting plate 60.

A valve spring 62 in a compressed state is provided between the projecting collar portion 54 and the valve body mounting plate 60.
Due to the spring pressure of 62, the valve body 61 is normally in pressure contact with the valve seat 47 to prevent backflow of hot water from the outflow passage 45 side to the inflow passage 44 side, and is integrally fixed to the water drain plug 43. The check valve 40 is constituted by the bush 55, the valve rod 57, the valve spring 62, the valve body mounting plate 60, the valve body 61, and the valve seat 47 that are open.

In the structure shown in FIG. 2, the check valve 40 and the water drain plug 43 are formed on the joint member 10b in the same manner as shown in FIG. valve
63 built in. That is, a valve forming chamber 64 having a rear end opening is formed on the rear end side of the water drain plug 43, and the valve forming chamber 64 is formed.
And the recessed space 52 are partitioned by a partition wall 65, and this partition wall
A communication hole 66 is opened in 65 to connect the recessed space 52 and the valve forming chamber 64.

A valve seat protruding rearward is provided at the edge of the communication hole 66.
67 is provided, and the valve 68 is locked to the valve seat 67 to close the communication hole 66. A compression coil spring is provided between the mounting plate 70 of the valve 68 and the spring receiver 71 on the rear end side (opening end side) of the valve forming chamber 64.
72 is interposed, the valve 68 is pressed against the valve seat 67 by the spring pressure of the coil spring 72, and the communication hole 66 is closed.

The pressure relief valve 63 opens the valve 68 against the urging force of the coil spring 72 when the pressure on the outflow passage 45 side becomes abnormally high, so that the abnormal pressure is transmitted from the communication hole 66 to the outside. Has a role to escape.

The check valve 40 and the water drain plug shown in FIGS. 1 and 2 above.
By using the joint member 10b with the built-in 43, the valve body 61 of the check valve 40 is also integrally withdrawn by pulling out the water drain plug 43, whereby the higher side than the joint member 10b. All the water in the hot water supply passage 20 in the appliance in the above will be extracted, and it will be possible to completely drain the water in the pipeline and reliably prevent the freezing of the water in the pipeline.

Further, since the water drain plug 43 and the valve body 61 are integrally formed, the apparatus can be made compact and the water drain plug 43 can be pulled out to make the valve body 61
Since it also comes out integrally, maintenance and replacement work such as cleaning of the valve body 61 side becomes extremely easy.

Further, as shown in FIG. 2, by integrally forming the valve body 61 of the check valve 40 and the pressure relief 63 in the water drain plug 43, the valve body 61 and the valve 68 are separated. It is possible to achieve a significant downsizing of the device and to facilitate the handling thereof, as compared with the case of providing the above.

Further, the joint member of FIGS. 1 and 2
The water draining operation part of the water drain plug 43 of 10b is the case 3 of the device 2.
Since it is arranged on the outside of the device, the work such as maintenance of the check valve 40 after removing the water drain plug 43 can be performed from the outside of the instrument 2, and the work such as the maintenance is very easy.

FIG. 3 shows still another embodiment. The same names as those in FIGS. 1 and 2 are designated by the same reference numerals, and the duplicated description thereof will be omitted. In the structure shown in FIG. 3, the water drain plug 43 is formed in a tubular shape, and the joint member 10b is formed.
The inflow passage 44 and the inner cylindrical space of the water draining plug 43 are communicated with each other, and a through hole 73 is formed in the cylindrical peripheral wall of the water draining plug 43 so that the inner cylindrical space of the water draining plug 43 and the joint member 10b flow out. A part of the flow passage from the inflow passage 44 to the outflow passage 45 is formed in the water drain plug 43 through the passage 45, and the valve seat 47 and the valve rod are provided in the water drain plug 43. A valve body 61 formed by connecting 57
And a valve spring 62 and a spring receiving plate 74 that supports one end of the valve spring 62.

A pressure relief valve 63 is incorporated on the rear end side of the water drain plug 43. The pressure relief valve 63 can be omitted, and in this case, the rear end side of the cylindrical hole of the water drain plug 43 is closed by the closing wall as in the case of FIG.

Also in the case of the embodiment shown in FIG. 3, the drain plug
By pulling out 43 from the joint member 10b, the check valve is also pulled out integrally, draining the water in the pipe line perfectly and preventing freezing of water, and cleaning the check valve. Maintenance can be done easily,
The same effects as those shown in FIGS. 1 and 2 can be obtained.

The present invention is not limited to the above-mentioned embodiments, and various embodiments can be adopted. For example, in the above embodiment, the appliance 2 is an automatic bathtub (combined water heater).
However, for example, as shown in FIG.
A hot water supply function with a hot water supply function and a hot water supply function, in which a hot water filling pipe 75 is connected to the branch passage 30 via a joint 10d, and the tip of the hot water filling pipe 75 is connected to the bathtub 1 to perform hot water filling. Applicable to combustion equipment (in this case, the joint of Fig. 6)
10b will be configured as shown in FIGS. 1 to 3), of course, a branch passage 30 is connected in the middle of the hot water supply passage of the hot water heat exchanger 4, and the opening / closing control valve (the opening / closing control valve is provided in the branch passage 30). A device of any other form may be used as long as it has a structure in which a pouring solenoid valve is interposed. For example, a device in which a water injection circuit or a hot water circuit for heating and heating hot water is connected to the outlet side of the branch passage 30. The present invention is also applied to.

Further, in the present embodiment, an example is shown in which the mixed water faucet 22 and the hot water tap 23 are connected to the equipment outside hot water supply passage 21, but the water taps connected to the equipment outside hot water supply passage 21 are various other than this embodiment. Various types can be connected and used, and the hierarchical arrangement of these faucets, appliances and bathtubs can also take any combination.

[0042]

As described above, the present invention provides a combustion equipment with a hot water supply function in which a branch passage having an opening / closing control valve is connected in the middle of a hot water supply passage in the equipment connected to the outlet side of the hot water heat exchanger, A check valve was installed in the joint member at the outlet of the hot water supply passage in the equipment to prevent backflow.Therefore, when opening / closing the open / close control valve to perform pouring water or pouring water through the branch passage from the hot water heat exchanger side, or opening / closing control The water hammer that occurs when the valve is closed can be mitigated, and the water hammer can prevent damage to the pressure sensor provided in the branch passage.

Further, since the joint member is provided with the water draining plug integrally incorporating the valve body of the check valve, the valve body of the check valve is also integrally withdrawn by removing the water draining plug.
It is possible to surely drain water for prevention of freezing, and it becomes easy to perform maintenance such as cleaning of the check valve and replacement work of the valve body. Moreover, since the work of cleaning and exchanging these check valves can be performed from the outside of the instrument, these works become very easy.

[Brief description of drawings]

FIG. 1 is a joint member that constitutes a combustion device with a hot water supply function.
FIG. 10 is a structural explanatory view of an embodiment in which a check valve and a water drain plug are incorporated in 10b.

FIG. 2 is a structural explanatory view of another embodiment in which a check valve, a water drain plug, and a pressure relief valve are also incorporated in the joint member 10b.

FIG. 3 is a structural explanatory view of still another embodiment in which a check valve is incorporated in the water drain plug of the joint member 10b.

FIG. 4 is a system diagram of a combined water heater (automatic bathtub) proposed by the present inventor.

FIG. 5 is a system diagram of a conventional automatic bath heater.

FIG. 6 is an explanatory diagram showing an example of another device to which the present invention is applied.

[Explanation of symbols]

 2 appliance 4 hot water heat exchanger 10a-10d joint member 20 hot water supply passage in appliance 30 branch passage 40 check valve 43 drain plug 61 valve body (valve)

Claims (2)

[Claims] 1. A hot water supply heat exchanger, a hot water supply passage in the equipment connected to the outlet side of the hot water supply heat exchanger, a branch passage connected in the middle of the hot water supply passage in the equipment, An opening / closing control valve provided in the branch passage is accommodated, and a joint member is provided on the outlet side of the hot water supply passage inside the equipment that has exited from the equipment case, and the hot water supply passage inside the equipment and the hot water supply outside the equipment are provided via this joint member. In a combustion device with a hot water supply function connected to a passage, a detachable water drain plug is provided on the joint member, and a valve body of a check valve including a valve body and a valve seat is provided on the water drain plug side. A combustor with a hot water supply function, which is built in and provided with a valve seat of a check valve on the flow passage side in a joint member. 2. A hot water supply heat exchanger, a hot water supply passage in the equipment connected to the outlet side of the hot water supply heat exchanger, a branch passage connected in the middle of the hot water supply passage in the equipment, and An opening / closing control valve provided in the branch passage is accommodated, and a joint member is provided on the outlet side of the hot water supply passage inside the equipment that has exited from the equipment case, and the hot water supply passage inside the equipment and the hot water supply outside the equipment are provided via this joint member. In a combustion device with a hot water supply function that is connected to a passage, a detachable water drain plug is provided in the joint member, and inside the water drain plug, the connection port of the hot water supply passage in the device of the joint member and the hot water supply passage outside the device are provided. A part of a flow passage communicating with the connection port of the water discharge valve is formed by way of the drainage stopper, and a check valve having a valve body and a valve seat is incorporated in the passage passage of the flow passage in the water drain plug. Combustor with hot water supply function vessel.