JP3725652B2 - Piping unit, hot water supply device and hot water supply system - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to, for example, a piping unit connected to a water pipe of a general household, and in particular, a piping unit connected to a water supply pipe for a hot water supply apparatus that supplies hot water to a bath, a washroom, etc., and a hot water supply apparatus including the piping unit And a hot water supply system.
[0002]
[Prior art]
For example, when installing a hot water supply apparatus that supplies hot water to a bath or a washroom of a general household, a water supply pipe that supplies water to the hot water supply apparatus and a hot water supply pipe that supplies hot water from the hot water supply apparatus to various places are connected. Such a hot water supply apparatus supplies hot water by heating a water supply pipe (water pipe) arranged in a heat exchanger by combustion of a combustor (hereinafter referred to as a “gas combustor”) of gas or oil. The installation location of this water heater is not particularly limited, but in apartment houses such as apartments and condominiums, the installation space of the water heater is limited, for example, when the bathtub is installed on the wall of an adjacent bathroom There is. And, gas pipes, water supply pipes, and hot water supply pipes are connected to this hot water supply device, but the space to which the pipes are connected is limited, and it may be difficult to reach the pipe connection location after installing the bathtub. is there.
[0003]
On the other hand, when a hot water heater is not used, for example, when it takes a period of time to move in after the installation of the hot water supply device, if the water pipe of the hot water supply device is filled with water in the winter, the water pipe is damaged due to water freezing. Sometimes. For this reason, when the hot water supply apparatus is not used in winter, it is necessary to drain water, and a configuration in which a drain plug is provided at the pipe connection portion of the hot water supply apparatus is known.
[0004]
In addition, in Japanese Utility Model Publication No. 54-87456, a water draining operation is performed indoors by interlocking with a required valve such as opening a water drain valve and closing a water supply valve in conjunction with an operation lever provided indoors. A configuration intended to be simplified is disclosed.
[0005]
Furthermore, in order to prevent the water in the water pipe of the heat exchanger from flowing back to the water supply pipe during operation of the hot water supply apparatus, a configuration in which a check valve is provided at the connection of the water supply pipe is known.
[0006]
[Problems to be solved by the invention]
However, as described above, when the installation space for the hot water supply device is limited, if the water drain plug (drainage portion) and the check valve are arranged at the connection portion of the water supply pipe, the size of the device increases. There is a problem that.
[0007]
Furthermore, there is no problem if the installation space for the hot water supply device is sufficient, but as described above, when the drainage part is out of the reach of the hand, the drainage part is separately provided in another part of the water supply pipe. the setting digit, is in front of the drainage portion is necessary to provide a valve. For this reason, it is necessary to provide a drainage part and a valve at an appropriate location of the water supply pipe according to the installation location of the hot water supply device, and it is necessary to provide a drainage part and a check valve at different positions depending on the installation situation and specifications. Therefore, there is a problem that the manufacture of the water heater becomes complicated.
[0008]
SUMMARY OF THE INVENTION An object of the present invention is to provide a piping unit, a hot water supply device, and a hot water supply system that can be attached to a necessary place as appropriate according to installation conditions and that can prevent backflow of the piping and drain water with a simple configuration.
[0009]
[Means for Solving the Problems]
In order to achieve the above-mentioned object, the invention according to claim 1 comprises a unit main body having a substantially cylindrical shape and having connection portions to be connected to the water pipes at both ends of the substantially cylindrical body, And a check valve that prevents the flow from the water outlet side to the water inlet side, and a drainage part that is openable and closable on the water outlet side of the check valve, the check valve comprising: a valve body; An urging means for urging the valve body toward the valve seat and a support body for movably supporting the valve body, and a water flow hole is formed around the support body. The edge is placed in contact with the step formed in the unit body, and a taper with a narrower diameter gradually formed from the step toward the water discharge side in the unit main body to be closer to the water discharge side than the valve chamber. A thickened part with a thicker wall is formed, and the drainage part is screwed into a horizontal hole formed in the thickened part and the horizontal hole. And it is characterized in that it has a screw portion to be.
[0010]
According to the first aspect of the present invention, since the piping unit is configured to integrally include the check valve and the drainage part, the piping unit is connected to a necessary portion of the water pipe (or water pipe) as appropriate. By simply doing this, it is possible to prevent backflow from the water discharge side to the water intake side, and when water drainage is necessary to prevent freezing, etc., the water drainage part can be opened to drain the water from the water discharge side. That is, since the piping unit can be arbitrarily installed in a place where the hand can easily reach for draining water, operability is good. For example, the place where the backflow is prevented is the connection place with the water pipe (water pipe), and the backflow from the hot water supply device to the water pipe is prevented to ensure sanitary safety, This prevents the backflow of boiling steam and ensures the adjustment of the temperature of the hot water coming out of the faucet.
The unit body has a taper with a diameter that gradually narrows from the stepped portion with which the support is engaged toward the water discharge side, so that the stepped portion blocks the flow holes formed around the support and There is nothing to do. Therefore, it is possible to reduce the flow resistance of the fluid flowing from the water inlet side to the water outlet side through the check valve.
The drainage portion has a structure in which a horizontal hole formed in the main body is closed with a screw, and the horizontal hole is formed on the water discharge side of the check valve. The thickness of the main body in the punched portion can be increased. Therefore, since the depth of the lateral hole can be increased, the screw can be surely engaged to prevent water leakage. Furthermore, since the lateral hole of the drainage portion can be formed close to the check valve, the entire unit can be made compact.
[0011]
The invention according to claim 2 is characterized in that, in the invention according to claim 1, the unit body includes a filter on the water inlet side of the check valve.
[0012]
According to the second aspect of the present invention, in the piping unit, water flows through the filter to the check valve, so that dust, intermediary objects, and the like are prevented from flowing to the check valve. For example, it is possible to prevent the blocking of the check valve by preventing dust from intervening between the valve body and the valve seat of the check valve, thereby preventing the check valve from being inhibited.
[0013]
[0014]
[0015]
[0016]
[0017]
The invention described in claim 3 is a hot water supply apparatus that heats and supplies hot water supplied to the heat exchanger, and includes a pipe unit that is detachably connected to a water supply connection port. It is a piping unit of Claim 1 or 2 , It is characterized by the above-mentioned.
[0018]
According to the third aspect of the invention, since the piping unit is detachably provided at the end of the inflow pipe of the hot water supply device, forgetting to attach the piping unit at the time of shipment is prevented.
[0019]
Also, if the installation location of the hot water supply device is small and the pipe unit cannot be reached after installation, remove the piping unit, connect the inflow pipe, and install the piping unit in other parts of the inflow pipe as appropriate. Can connect. In particular, the construction is easy because it can easily cope with the situation of the construction site at the installation site.
[0020]
The invention according to claim 4 is the invention according to claim 3 , wherein the hot water supply device is provided with a plurality of water channels in one heat exchanger.
[0021]
According to the fourth aspect of the present invention, when heating one water channel among the plurality of water channels provided in the heat exchanger, the other water channel may be heated to heat the one water channel. However, even if other water channels boil in this case, since the piping unit is connected to the flowing water pipe, the check valve disposed in the piping unit prevents the steam or hot water from flowing back. Moreover, since the water draining part in this hot water supply apparatus can be installed in an appropriate place, the water draining for freeze prevention etc. can be performed easily.
[0022]
According to a fifth aspect of the present invention, in the invention according to the fourth aspect , the water channel that passes through the heat exchanger of the hot water supply device is configured such that the downstream side and the upstream side of the heat exchanger communicate with each other and the hot water after the heat exchange is performed. A bypass passage is provided for mixing with water before heat exchange.
[0023]
According to the fifth aspect of the present invention, the hot water after heat exchange and the water before heat exchange are mixed by the bypass passage to control the temperature of the hot water to be supplied. However, since a check valve is provided, steam and hot water are prevented from flowing back to the water supply side. Accordingly, hot water that has been heated before heat exchange flows back to the downstream side of the bypass passage, and hot water and steam are prevented from being mixed with the hot water after heat exchange instead of cold water. Therefore, when hot water is supplied, it is possible to prevent hot water from being discharged, and temperature control of the hot water to be supplied can be ensured.
According to a sixth aspect of the present invention, in the hot water supply device according to the third aspect, a plurality of connection ports are arranged in a row at the lower end of the hot water supply device, from the front of the plurality of connection ports. The piping unit according to claim 1 or 2 is provided on the right side, and the piping unit protrudes from the connection port arranged side by side .
According to the sixth aspect of the present invention, it is easy to remove and attach the piping unit.
[0024]
The invention described in claim 7 is a hot water supply system in which a hot water supply apparatus, a water supply pipe for supplying water to the hot water supply apparatus, and a hot water supply pipe for deriving hot water heated by the hot water supply apparatus are connected to each other. This piping unit is the piping unit according to claim 1 or 2 .
[0025]
According to the seventh aspect of the present invention, in the hot water supply system that supplies water to the hot water supply device from the water supply pipe and supplies hot water to various places from the hot water supply pipe connected to the hot water supply device, Since the drainage part is provided, the check valve and the drainage part can be easily arranged in the hot water supply system. Moreover, in the water supply piping, the location of the water draining operation can be arbitrarily set by appropriately connecting the piping unit according to the construction location, so that the operability and workability are good.
[0026]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to FIGS. 1 to 11R> 1 of the accompanying drawings. As shown in FIG. 9, the gas water heater (hot water supply device) 3 including the piping unit 1 according to the embodiment of the present invention is connected to the lower end of the device main body 5 from the right side in the drawing with the piping unit 1 and the hot water supply connection port 7. , A gas connection port 9, a drain tube 11, a forward bath connection port 13, and a return bath connection port 15 are provided. An upper end portion 21 of the piping unit 1 is screwed into a connection port 23 provided in the main body 5 and is detachably connected. The lower end portion 17 of the water supply unit is formed with a screw to which a water supply pipe 19 (see FIG. 11R> 1) is connected by screwing.
[0027]
The piping unit 1 is connected at the time of shipment of the gas water heater 3, and can be removed as necessary during installation and construction. Thus, by connecting at the time of shipment, forgetting to connect the piping unit 1 at the construction site can be prevented.
[0028]
Next, the structure and piping of the gas water heater 3 will be described with reference to FIG. The gas water heater 3 includes a heat exchanger 27 in which a hot water supply pipe 25 to which clean water is supplied and a re-cooking pipe 26 for introducing water from a bath are arranged, and two water channels are provided by one heat exchanger. It is a so-called one can two water channel that heats. The heat exchanger 27 is heated by a heating unit 29 that blows heated gas from the burner 31.
[0029]
A water thermistor 33 and a water amount sensor 35 are arranged in the hot water supply pipe 25 from the piping unit 1 toward the water supply direction (downstream side), and after passing through the heat exchanger 27, a flow rate control valve 37, a hot water supply confirmation switch. 39 is arranged and reaches the hot water supply connection port 7. Near the inlet and outlet sides of the heat exchanger 27, a first bypass passage 41 is formed to mix the hot water after the heat exchange with the supplied water. A second bypass passage 43 is also formed downstream of the flow control valve 37, and the opening and closing of the second bypass passage 43 is controlled by a bypass control valve 45. The temperature of the tap water is controlled by the second bypass passage 43.
[0030]
The additional cooking pipe 26 includes a bath temperature sensor 49, a water flow switch 51, and a pump 53 on the inflow side from the bathtub 47. The hot water (or water) in the bathtub 47 is returned to the bathtub 47 through the heat exchanger 27. It is like that.
[0031]
As described above, the heat exchanger 27 has one can two water channels in the present embodiment, and the heat exchanger 27 is provided with two systems of water pipes, hot water supply and additional cooking. And the hot water supply pipe | tube 25 is arrange | positioned at the lower side near the gas burner 31, and the additional cooking pipe 26 is arrange | positioned at the upper side far from the gas burner 31, The fin 51 common to these hot water supply pipes 25 and the additional cooking pipe 26 is provided. It is fixed. By arranging the hot water supply pipe 25 on the lower side in this way, when only cooking without hot water supply, the hot water supply pipe 25 is heated and the additional cooking pipe 26 is heated with the heat.
[0032]
The hot water supply pipe 25 and the additional cooking pipe 26 are connected via a hot water solenoid valve 53 and a water level sensor 55 so that hot water can be poured into the additional cooking pipe 26.
[0033]
On the other hand, the heating unit 29 is disposed in the lower part of the heat exchanger 1 and includes a gas burner 31 for burning gas and a combustion fan 57. The heating unit 29 ignites the gas introduced from the gas pipe 59 to the heat exchanger 27. It is configured to supply high-temperature gas. In addition, provided under the gas burner 31 are a nozzle holder 61, a switching electromagnetic valve 63, a gas proportional valve 65, and a main electromagnetic valve 67, which adjust the combustion state of the gas.
[0034]
Next, with reference to FIG. 1 thru | or FIG. 8, the piping unit 1 concerning this invention is demonstrated. 1 is a sectional view of the piping unit, FIG. 2 is a front view of the piping unit, FIG. 3R> 3 is a side view of the unit body, FIG. 4 is a sectional view of the unit body, FIG. 6 is a side view of the valve lid, FIG. 7 is a plan view of the support, and FIG. 8 is a side view of the support.
[0035]
The piping unit 1 is integrally provided with a unit main body 71, a check valve 73 disposed in the unit main body 71, and a drainage portion 75 provided on the downstream side of the check valve 73. The valve 73 prevents a back flow from the heat exchanger side (downstream side) to the water supply side (upstream side), and the water drainage part 75 freezes the hot water supply pipe 25 disposed in the heat exchanger by draining in winter. It is the composition which prevents.
[0036]
The unit main body 71 includes an internal thread portion (connection portion) connected to the connection port 23 of the water heater on the upper side (one side) 77, and a valve seat 80 of the check valve 73 on the lower side (other side) 78. A valve lid 81 that is formed and covers the check valve is screwed together.
[0037]
A filter 82 is accommodated in the valve lid 81, and dust, interstitial objects, etc. flowing through the check valve 73 are removed. Accordingly, it is possible to prevent interference between the valve element 79 and the valve seat 80 of the check valve 73 from interfering with the closing of the valve, thereby maintaining the function of the check valve. The valve lid 81 is provided with an O-ring 70 on the valve seat 80 side.
[0038]
The unit main body 71 includes a valve chamber 83 in which a check valve 73 is disposed at the center, and a water discharge side passage 85 is formed on the upper side 77. The inner diameter of the valve chamber 83 is formed larger than the diameter of the water discharge side passage 85, and the thickness H on the side of the water discharge side passage 85 is thicker than the wall thickness M of the valve chamber. Yes. By forming the water discharge side passage 85 with a large thickness H, a screw 87 (described later) that forms the drainage portion 75 can be deeply screwed, so that the drain hole 87 (described later) is closed. ing. On the water discharge side passage 85 side, a stepped portion 72 is formed to hold the support body 84 of the check valve 73 in contact therewith. A tapered portion 78 is formed between the stepped portion 72 and the water discharge side passage 85. Since the diameter of the tapered portion 78 is gradually narrowed from the stepped portion 72 toward the water discharge side passage 85, the stepped portion 72 blocks the flowing water hole 86 formed around the support body 84 and becomes a resistance. The flow resistance of the fluid flowing from the water inlet side to the water outlet side through the check valve can be reduced. The inclination angle S of the tapered portion 78 is not particularly limited, but is 90 ° in the present embodiment. Further, the thickness of the unit main body 1 at the drainage portion 75 can be increased to deepen the screwing of the drainage hole 87 and the screw engagement can be sufficiently ensured, so that water leakage from the drainage portion 75 is ensured. Can be prevented.
[0039]
The check valve 73 includes a valve body 79, a spring (biasing means) 88 that biases the valve body 79 toward the valve seat 80, and a disk-shaped support body 84 that supports the valve body 79 movably. It has. As shown in FIGS. 7 and 8, the support body 84 is formed with a water flow hole 86 that allows water to flow around it, and a step portion in which an edge portion 84 a of the support body is formed in the unit main body 71. 72 so as to be in contact with and supported. A guide portion 84b that slides and guides the shaft 79a of the valve body 79 is provided at the center of the support body 84. A coil spring 88 is attached to the outer periphery of the guide portion 84b to urge the valve body 79 toward the valve seat 80 at all times.
[0040]
The drainage portion 75 is provided on the downstream side of the check valve 73 in the direction of water flow. As described above, the drainage hole 87 formed as a horizontal hole in the unit body 1 and the drainage hole It is comprised by the thumbscrew 91 screwed together to 87. Since the drain hole 87 is a horizontal hole formed in the tube wall of the unit main body 71, the configuration is simple and compact.
[0041]
Next, the operation of the present embodiment will be described. In the hot water supply operation, when the bath is reheated and hot water is supplied at the same time, the water supplied to the hot water supply pipe 25 through the piping unit 1 is heated through the heat exchanger 27, and is washed from the hot water supply connection port 7. It is sent to each hot water supply point such as a place or kitchen. At the same time, in the additional cooking pipe 26, the water (hot water) in the bath is supplied to the additional cooking pipe 26 by driving the circulation pump 53, and is returned to the bathtub 47 through the heat exchanger 27. In the water supply to the hot water supply pipe 25, the check valve 73 disposed in the piping unit 1 prevents water from flowing back to the water supply side, thereby ensuring hygiene safety.
[0042]
On the other hand, when only reheating the bath without supplying hot water, in the state where water is not supplied to the hot water supply pipe 25, the heat exchanger 27 mainly heats the hot water supply pipe 25 close to the burner 31. Then, the heat of the hot water supply pipe 25 is transferred by the fins 51 to heat the cooking pipe 26. In this case, although the temperature of the hot water supply pipe 25 is controlled, the water in the hot water supply pipe 25 may boil. The steam generated by boiling in the hot water supply pipe 25 tends to flow back to the water supply side, but the check valve 73 arranged in the piping unit 1 prevents the steam from returning to the water supply side. This prevents steam from being heated or heated from a water faucet such as a washroom connected to the water supply side.
[0043]
That is, if the check valve 73 is not provided, hot water flows back to the downstream side of the bypass control valve (solenoid valve) 45 of the second bypass passage 43, and in this state, a faucet such as a washroom is opened. When the hot water is supplied, the temperature is controlled by mixing the cold water on the water supply side in the second bypass passage 43 so that the hot water is not from the faucet, but the cold water does not mix even if the bypass control valve 45 is opened. The hot water on the heat exchanger 27 side is mixed with the temperature, and the temperature cannot be controlled. Therefore, by providing the check valve 73, it is possible to prevent excessive hot water from coming out and to control the temperature of the hot water to be supplied.
[0044]
This is because the same situation occurs in the first bypass passage which is a fixed bypass without having a control valve, and hot water having a high heat exchange temperature is mixed with cold water from the water supply side. Even when supplying hot water whose temperature is controlled, by providing the check valve 73, hot water or steam does not flow back to the water supply side, so it is possible to reliably mix cold water from the water supply side with hot water. The temperature control of the hot water to be supplied can be reliably performed.
[0045]
Further, in a cold region, after the gas water heater 3 is installed in an apartment house or the like, water is left in the hot water supply pipe 25 in the gas water heater 3 in order to perform a water passage test. In this state, since the gas water heater 3 is not operated during the period before the occupant enters, there is a possibility that the water in the hot water supply pipe 25 is frozen and the hot water supply pipe 25 is damaged due to its volume expansion. Therefore, during this period, the thumbscrew 91 of the drainage portion 75 is turned to drain water from the drainage hole 87. Thereby, the hot water supply pipe 25 is prevented from being damaged due to freezing of water in the hot water supply pipe 25.
[0046]
When installing the gas water heater 3, as shown in FIG. 11, when the gas water heater 3 is arranged in a limited space between the wall and the bathtub 47 in the bathroom 5, the above-described water draining operation is difficult, or the gas water heater There is a risk that hands may not enter the gap in which the vessel 3 is installed. In such a case, the piping unit 1 attached to the water heater main body 5 is removed as shown in FIG. 9, and the water supply piped under the bathtub 47 or on the side of the bathtub 47 as shown in FIG. The piping unit 1 is attached to the piping 102. Thereby, the draining work can be easily performed on the side surface of the bathtub 47 or the like. Although not shown, a side panel of the bathtub 47 is normally provided with a panel, so that the side of the bathtub 47 is exposed by removing this panel. In FIG. 11, 96 is a washstand, 97 is a power outlet, 98 is a shower, 99 is a bath remote control, 100 is a water tap, and 101 is a gas plug.
[0047]
The present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the present invention. For example, in the above-described embodiment, the hot water supply pipe 25 and the additional cooking pipe 26 are provided in one heat exchanger 27. However, the present invention is not limited to this, and two water paths of the hot water supply pipe 25 and the heating hot water pipe are arranged. A similar effect can be obtained even if a multi-water channel such as a so-called canned three-water channel, which arranges three water channels including a hot water supply pipe 25, a reheating pipe 26, and a heating hot water pipe, is provided. The same effect as the state can be obtained.
[0048]
Further, the piping unit 1 is not limited to the gas water heater shown in FIG. 11, and can be similarly applied as long as it is necessary for backflow prevention and drainage. The unit can be removed from the main body and easily attached to a necessary place as needed, or can be piped while attached to the main body.
[0049]
【The invention's effect】
According to invention of Claim 1, since a piping unit is a structure which is integrally provided with a non-return valve and a drainage part, it is only necessary to connect a piping unit to the required part of a water pipe from the water discharge side. In addition to preventing backflow to the inflow side, when drainage is required for anti-freezing, etc., the drainage part can be opened to drain the outflow side. Since the piping unit can be installed arbitrarily in a place where the hand can easily reach for draining water, operability is good. Further, since the piping unit is integrally provided with the check valve and the drainage portion, the backflow of the piping can be prevented and the water drained with a simple configuration.
The unit body has a taper that gradually decreases in diameter from the stepped portion that engages the support of the check valve toward the water discharge side, so that the stepped portion has a flow hole formed around the support. It can prevent obstruction and obstruction. Thereby, the flowing resistance of the fluid which flows from the inflow side to the outflow side through the check valve can be reduced.
A drainage part is the structure which plugs the horizontal hole formed in the main body with a screw, and can form a drainage part with a simple structure. Furthermore, since the lateral hole is formed on the water discharge side of the check valve having a thick main body, the lateral hole can be deepened. Therefore, it is possible to prevent the water leakage by ensuring the screw engagement. Furthermore, since the lateral hole of the drainage portion can be formed close to the check valve, the entire unit can be made compact.
[0050]
According to invention of Claim 2, since a piping unit is a structure provided with a filter, it can prevent that a dust, an intermediary object, etc. inhibit the function of a non-return valve.
[0051]
[0052]
[0053]
According to the third aspect of the invention, since the piping unit is detachably provided at the end of the inflow pipe of the hot water supply device, forgetting to attach the piping unit at the time of shipment can be prevented.
[0054]
Moreover, since a piping unit can be removed as needed and a piping unit can be connected to a required location suitably, construction is easy.
[0055]
According to the fourth aspect of the present invention, the check valve prevents the backflow of boiling steam that is likely to occur when one of the plurality of water channels provided in the heat exchanger is heated and the other water channel is heated. It can be surely prevented.
[0056]
In the invention according to claim 5 , the water channel passing through the heat exchanger of the hot water supply apparatus is configured to mix the hot water after heat exchange and the water before heat exchange by a bypass passage, and a piping unit arranged on the water supply side Since it has a check valve, it prevents steam and hot water from flowing back to the water supply side. Accordingly, hot water that has been heated before heat exchange flows back to the downstream side of the bypass passage, and hot water and steam are prevented from being mixed with the hot water after heat exchange instead of cold water. Therefore, when hot water is supplied, it is possible to prevent hot water from being discharged, and temperature control of the hot water to be supplied can be ensured.
According to a sixth aspect of the present invention, a plurality of connection ports are arranged in a row in the hot water supply device, and the piping unit according to the first or second aspect on the right side from the front of the plurality of connection ports. Since this piping unit protrudes from the connection port arranged side by side, it is easy to remove and attach the piping unit.
[0057]
According to the seventh aspect of the present invention, in the hot water supply system for supplying water from the water supply pipe to the hot water supply apparatus and supplying hot water from the hot water supply apparatus to each place, the water supply pipe is provided with a check valve and a drain. The piping of hot water supply shimtem can be done easily. Moreover, since the place of water draining operation can be arbitrarily set by connecting a piping unit to a required place suitably according to a construction place for water supply piping, operativity and workability are good.
[0058]
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a piping unit according to an embodiment of the present invention.
FIG. 2 is a front view of the piping unit shown in FIG.
FIG. 3 is a side view of the unit main body.
FIG. 4 is a cross-sectional view of a unit main body.
FIG. 5 is a cross-sectional view of a valve lid.
FIG. 6 is a side view of the valve lid.
FIG. 7 is a plan view of a support.
FIG. 8 is a side view of the support.
FIG. 9 is a front view of the gas water heater.
FIG. 10 is a circuit diagram of a gas water heater.
FIG. 11 is a perspective view showing a hot water supply system.
[Explanation of symbols]
1 Piping unit 3 Gas water heater (hot water supply device)
71 Unit body 73 Check valve 75 Drain part 79 Valve body 81 Valve lid 78 Taper 87 Drain hole (horizontal hole)

Claims (7)

A unit main body having a substantially cylindrical shape and provided with connection portions to be connected to the water pipe at both ends of the substantially cylindrical body, and a check that is arranged in the unit main body and prevents the flow from the water discharge side to the water intake side A valve and a drainage portion provided on the water discharge side of the check valve so as to be openable and closable. The check valve includes a valve body and biasing means for biasing the valve body toward the valve seat; And a support body that movably supports the valve body, and a flow hole is formed around the support body, and the edge of the support body is disposed in contact with a step formed in the unit body. In the unit body, there is formed a thicker portion with a taper that is gradually narrowed from the stepped portion toward the water discharge side, and is thicker on the water discharge side than the valve chamber. parts are pipes uni characterized in that it has a screw portion to be screwed into the lateral hole and the transverse hole formed in the thick portion Door. The piping unit according to claim 1, wherein the unit body includes a filter on a water inlet side of the check valve. The hot water supply apparatus which heats and supplies hot water supplied to the heat exchanger includes a piping unit having one end detachably connected to a water supply connection port, and the piping unit according to claim 1 or 2. A hot water supply device characterized by being a unit. The hot water supply apparatus according to claim 3 , wherein the hot water supply apparatus includes a plurality of water channels in one heat exchanger. At least one water channel passing through the heat exchanger of the hot water supply apparatus includes a bypass passage that communicates the downstream side and the upstream side of the heat exchanger to mix the hot water after heat exchange and the water supply before heat exchange. The hot water supply apparatus according to claim 4 . A plurality of connection ports are arranged in a row at the lower end of the hot water supply device, and the piping unit according to claim 1 or 2 is provided on the right side from the front of the plurality of connection ports. The hot water supply apparatus according to claim 3, wherein the piping unit protrudes from the connection port arranged side by side. In a hot water supply system in which a hot water supply device, a water supply pipe for supplying water to the hot water supply device, and a hot water supply pipe for deriving hot water heated by the hot water supply device are connected, the water supply pipe includes a pipe unit, Item 3. A hot water supply system, which is the piping unit according to item 1 or 2 .

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