JP5903825B2 - Multi-way valve and hot water storage water heater - Google Patents

Description

  The present invention relates to a multi-way valve and a hot water storage type water heater.

  For example, in a device such as a water heater having a plurality of circulation paths through which a fluid flows, a multi-way valve is used for the purpose of switching the circulation path. Conventionally, in this multi-way valve, a seat packing (seal member) is pressed against a valve body such as a ball by the pressure of fluid applied from the outside, and the sealing effect between the seat packing and the valve body is improved. (For example, refer to Patent Document 1).

Japanese Utility Model Publication No. 6-71977

  However, even if the above-described configuration is used, the following problems occur depending on the structure of the multi-way valve. For example, when a fluid pressure is applied to each port of the multi-way valve from the atmosphere open state, the seat packing is pressed against the valve body by the fluid pressure, and the seal between the seat packing and the valve body is sealed. At this time, since the space surrounded by the seat packing and the valve body is a closed space inside the main body of the multi-way valve, the atmospheric pressure state is maintained. For this reason, a differential pressure is generated between each port and the above-described closed space, and a force that causes the seat packing to tighten and restrain the valve body is generated by this differential pressure. As a result, the torque required to rotate the valve body increases, smooth rotation of the valve body is hindered, and malfunction may occur.

  The present invention has been made to solve the above-described problems, and is a multi-way valve capable of suppressing an increase in torque necessary for rotating a valve body when a fluid pressure is applied. Another object of the present invention is to provide a hot water storage type water heater provided with the same.

The multi-way valve according to the present invention includes a main body provided with a plurality of ports, a valve body rotatably installed in the main body and having a flow path formed therein, and a seal that seals between the valve body and the port and members, formed in the valve body, engaging a communication passage for communicating the flow path of the closed space surrounded by the main body and the valve body and the sealing member and the valve body portion, the engagement hole formed in the valve body And a shaft for rotationally driving the valve body, and the communication path and the engagement hole are configured as a common hole .
The multi-way valve according to the present invention includes a main body provided with a plurality of ports, a valve body rotatably installed in the main body and having a flow passage formed therein, and a seal between the valve body and the port. A sealing member, a closed space formed in the sealing member and surrounded by the main body, the valve body, and the sealing member, and a communication path that communicates with any one of the plurality of ports. .

  According to the present invention, it is possible to suppress an increase in torque necessary for rotating the valve body when a fluid pressure is applied, and to prevent malfunction of the multi-way valve at the time of initial use or resumption of use. It becomes possible to prevent reliably.

It is a perspective view which shows the multiway valve of Embodiment 1 of this invention. It is a side view which shows the multiway valve of Embodiment 1 of this invention. It is a top view which shows the multiway valve of Embodiment 1 of this invention. It is the sectional view on the AA line in FIG. FIG. 5 is a sectional view taken along line BB in FIG. 3. It is sectional drawing which expands and shows the valve body with which the multiway valve of Embodiment 1 of this invention is provided. It is sectional drawing which expands and shows the valve body with which the multi-way valve of Embodiment 2 of this invention is provided. It is a perspective view which expands and shows the seat packing with which the multi-way valve of Embodiment 3 of this invention is provided. It is sectional drawing which expands and shows the seat packing with which the multi-way valve of Embodiment 4 of this invention is provided. It is a block diagram which shows embodiment of the hot water storage type water heater provided with the multi-way valve of this invention.

  Embodiments of the present invention will be described below with reference to the drawings. In addition, the same code | symbol is attached | subjected to the element which is common in each figure, and the overlapping description is abbreviate | omitted.

Embodiment 1 FIG.
1, 2 and 3 are a perspective view, a side view and a plan view showing the multi-way valve according to Embodiment 1 of the present invention, respectively. 4 is a cross-sectional view taken along the line AA in FIG. 2, and FIG. 5 is a cross-sectional view taken along the line BB in FIG. As shown in FIGS. 1 to 3, the four-way valve 200, which is a multi-way valve of this embodiment, includes a main body 210 and a stepping motor 201 that serves as power for channel switching, both of which are interposed via a motor mounting plate 250. Are connected and fixed. The main body 210 is provided with a first port 202, a second port 203, a third port 204, and a fourth port 205. The first to fourth ports 202 to 205 are arranged so that the center lines thereof are 90 ° apart and have a cross shape as a whole.

  As shown in FIG. 4, a substantially spherical valve body 230 is disposed at the center inside the main body 210. The valve body 230 is rotatable around a straight line perpendicular to the paper surface of FIG. An L-shaped channel 231 is formed inside the valve body 230. In the four-way valve 200, any two adjacent ports of the first to fourth ports 202 to 205 are communicated with each other via the flow path 231 according to the direction (rotational position) of the valve body 230, and the other two One port can be blocked.

  An annular seat packing 225, 226, 227, 228 as a sealing member is provided inside the main body 210 and between the base end portions of the first to fourth ports 202 to 205 and the valve body 230. 230 in contact with each other. In addition, O-rings 215, 216, 217, and 218 as seal members are installed in a compressed state between the sheet packings 225 to 228 and the base end portions of the first to fourth ports 202 to 205. Yes. By these sealing members, the first to fourth ports 202 to 205 and the valve body 230 are sealed in a liquid-tight manner, and internal leakage between the first to fourth ports 202 to 205 is prevented.

  In the present embodiment, flanges 211, 212, 213, and 214 are formed at the distal ends of the first to fourth ports 202 to 205, respectively. Further, O-rings 219, 220, 221, and 222 are installed between the first to fourth ports 202 to 205 and the main body 210 to ensure liquid tightness.

  As shown in FIG. 5, a shaft insertion hole 210a is formed through the upper portion of the main body 210 so as to be concentric with the rotation center line of the valve body 230, and the shaft 240 is inserted into the shaft insertion hole 210a. The shaft 240 is pressed by the motor mounting plate 250 and is prevented from coming off. The motor mounting plate 250 is fixed to the main body 210 with screws or the like (not shown).

  FIG. 6 is an enlarged cross-sectional view of the valve body 230. As shown in FIG. 6, the valve body 230 is formed with a shaft engagement hole 230a and a conduction hole 230b (communication path). The conduction hole 230 b is formed as a through hole that penetrates between the outer surface of the valve body 230 and the flow path 231.

  As shown in FIG. 5, the end 240 a of the shaft 240 on the valve body 230 side has a shape that is inserted into the shaft engagement hole 230 a of the valve body 230 and engaged (fitted). When the shaft 240 rotates, the valve body 230 also rotates together. An end 240 b of the shaft 240 on the stepping motor 201 side is fitted with the stepping motor 201. O-rings 223 and 224 are arranged on the outer peripheral portion of the shaft 240 to ensure liquid tightness, and external leakage from the inside of the main body 210 is prevented. By giving a rotation instruction to the stepping motor 201, the shaft 240 rotates in conjunction with the rotation of the stepping motor 201, and the valve body 230 rotates integrally therewith. Thereby, the state in which the first port 202 and the second port 203 are communicated to block other ports, the state in which the second port 203 and the third port 204 are communicated to block other ports, There are four switching states: a state in which the third port 204 and the fourth port 205 are communicated to block other ports, and a state in which the fourth port 205 and the first port 202 are communicated to block other ports. You can switch between them. In such a four-way valve 200, a closed space 260 surrounded by the inner wall of the main body 210, the outer surface of the valve body 230, and the seat packings 225 to 228 and O-rings 215 to 218 that are seal members is formed. In the present embodiment, by providing the conduction hole 230b in the valve body 230, the flow path 231 inside the valve body 230 and the closed space 260 communicate with each other via the conduction hole 230b.

  Here, in order to make it easy to understand the operational effects of the four-way valve 200 of the present embodiment, a case where the conduction hole 230b is not provided in the valve body 230 will be described as a comparative example. When fluid pressure (water pressure or the like) is first applied to the first to fourth ports 202 to 205 of the four-way valve 200 at the first use or resumption of use of the device including the four-way valve 200, the first to first Since the fluid pressure does not act on the closed space 260 that is not in communication with the fourth ports 202 to 205, the pressure in the closed space 260 is maintained at atmospheric pressure. As a result, the pressure in the first to fourth ports 202 to 205 becomes higher than the pressure of the closed space 260, so that the seat packing 225 to 228 is strongly pressed against the valve body 230 by the differential pressure, and the seat packing 225 to 228 is A force that tightens and restrains the valve body 230 is generated. As a result, the frictional force between the valve body 230 and the seat packing 225 to 228 increases, and the torque necessary for the rotation of the valve body 230 increases. Therefore, when a rotation instruction is input to the stepping motor 201, the valve body 230 Smooth rotation may be hindered, resulting in malfunction.

  On the other hand, in the four-way valve 200 of the present embodiment, the fluid pressure is initially applied to the first to fourth ports 202 to 205 of the four-way valve 200 when the device including the four-way valve 200 is used for the first time or when the use is resumed. Since the pressure of the fluid which acted on the flow path 231 of the valve body 230 also acts on the closed space 260 through the conduction hole 230b, the first to fourth ports 202 to 205 and the closed space 260 are Becomes isobaric. For this reason, generation | occurrence | production of the force which the sheet | seat packing 225-228 clamp | tightens and restrains the valve body 230 can be suppressed. As a result, an increase in torque necessary for the rotation of the valve body 230 can be reliably suppressed, so that when the rotation instruction is input to the stepping motor 201, the smooth rotation operation of the valve body 230 without causing a malfunction. Is possible.

  In the present embodiment, the applied fluid pressure can also be applied to the closed space 260 via the conduction hole 230b in any of the four switching states of the four-way valve 200. The above effects can be obtained with certainty. In the four-way valve 200 of the present embodiment, the fluid circuit connected to the first to fourth ports 202 to 205 is connected to the closed space 260 through the flow path 231 of the valve body 230 and the closed space 260. The communication hole 230b communicates, and the first to fourth ports 202 to 205 are not short-circuited by the conduction hole 230b. Therefore, the four-way valve 200 is in any one of the four switching states. However, the fluid in the fluid circuit that is in the cut-off state (non-conductive state) does not leak.

  Further, in this embodiment, the conduction hole 230b is disposed at a position avoiding the sliding portion between the valve body 230 and the seat packing 225 to 228, and the conduction hole 230b and the seat packing are rotated even when the valve body 230 rotates. There is no contact with 225-228. For this reason, abnormal wear of the sheet packings 225 to 228 due to contact with the conduction hole 230b can be reliably prevented.

  In this embodiment, the embodiment in which the present invention is applied to a four-way valve has been described. However, the present invention can be applied to a multi-way valve having a plurality of ports such as a three-way valve in addition to the four-way valve. can get.

Embodiment 2. FIG.
Next, the second embodiment of the present invention will be described with reference to FIG. 7. The description will focus on the differences from the first embodiment described above, and the same or corresponding parts will be described with the same reference numerals. Is omitted.

  FIG. 7 is an enlarged cross-sectional view of the valve body 230 included in the multi-way valve (four-way valve 200) according to Embodiment 2 of the present invention. As shown in FIG. 7, a conduction hole 230 c (communication path) is formed in the valve body 230 included in the four-way valve 200 of the present embodiment instead of the conduction hole 230 b in the first embodiment. The conduction hole 230c extends the shaft engagement hole 230a and communicates with the flow path 231. That is, the conduction hole 230c and the shaft engagement hole 230a are configured as a common hole. There is a slight gap between the shaft engagement hole 230a and the end 240a of the shaft 240 inserted into the shaft engagement hole 230a. For this reason, when fluid pressure is applied to the first to fourth ports 202 to 205, the fluid pressure acting on the flow path 231 of the valve body 230 is closed through the conduction hole 230c and the shaft engagement hole 230a. Also, the first to fourth ports 202 to 205 and the closed space 260 become equal pressure. In the present embodiment, the same effects as in the first embodiment can be obtained in this way. Further, since the conduction hole 230c and the shaft engagement hole 230a are configured as a common hole, the valve body 230 can be easily manufactured, and the cost can be reduced.

Embodiment 3 FIG.
Next, a third embodiment of the present invention will be described with reference to FIG. 8. The description will focus on the differences from the above-described embodiment, and the same or corresponding parts will be described with the same reference numerals. Omitted.

  FIG. 8 is an enlarged perspective view showing the seat packing 225 included in the multi-way valve (four-way valve 200) according to Embodiment 3 of the present invention. The valve body 230 provided in the four-way valve 200 of the present embodiment is not formed with the conduction holes 230b and 230c in the above-described embodiment. On the other hand, as shown in FIG. 8, a groove 225 a (communication path) is formed in the seat packing 225 provided in the four-way valve 200 of the present embodiment so as to cross a sliding portion with the valve body 230. When fluid pressure is applied to the first to fourth ports 202 to 205, the fluid pressure that has acted on the first port 202 also acts on the closed space 260 via the groove 225a. For this reason, the first to fourth ports 202 to 205 and the closed space 260 have the same pressure. Thereby, in this embodiment, the same effect as Embodiment 1 is acquired. It goes without saying that the same effect can be obtained when a similar groove (communication path) is provided in any of the sheet packings 226 to 228 instead of the sheet packing 225.

Embodiment 4 FIG.
Next, a fourth embodiment of the present invention will be described with reference to FIG. 9. The description will focus on the differences from the above-described embodiment, and the same or corresponding parts will be described with the same reference numerals. Omitted.

  FIG. 9 is an enlarged cross-sectional view of the seat packing 225 included in the multi-way valve (four-way valve 200) according to Embodiment 4 of the present invention. The valve body 230 provided in the four-way valve 200 of the present embodiment is not formed with the conduction holes 230b and 230c in the above-described embodiment. On the other hand, in the seat packing 225 provided in the four-way valve 200 of the present embodiment, as shown in FIG. 9, a conduction hole 225b (communication path) penetrating between the inner peripheral surface and the end surface on the valve body 230 side is formed. Has been. When fluid pressure is applied to the first to fourth ports 202 to 205, the fluid pressure that has acted on the first port 202 also acts on the closed space 260 via the conduction hole 225b. For this reason, the first to fourth ports 202 to 205 and the closed space 260 have the same pressure. Thereby, in this embodiment, the same effect as Embodiment 1 is acquired. In the present embodiment, the conduction hole 225b is disposed at a position avoiding the sliding portion with the valve body 230, and the valve body 230 does not contact the conduction hole 225b. For this reason, abnormal wear due to sliding can be reliably prevented. It goes without saying that the same effect can be obtained when a similar conduction hole (communication path) is provided in any of the sheet packings 226 to 228 instead of the sheet packing 225.

Embodiment 5 FIG.
Next, a fifth embodiment of the present invention will be described with reference to FIG. 10. The description will focus on the differences from the first embodiment described above, and the same or corresponding parts will be denoted by the same reference numerals. Is omitted. FIG. 10 is a configuration diagram showing an embodiment of a hot water storage type water heater provided with the multi-way valve of the present invention.

  The hot water storage type water heater 100 of this embodiment shown in FIG. 10 includes a hot water storage tank unit 1 and a heat pump unit 60 configured to use a heat pump cycle. The hot water storage tank unit 1 and the heat pump unit 60 are connected by a heat pump inlet pipe 41 and a heat pump outlet pipe 42. The hot water storage tank unit 1 has a control unit 70 built therein. Operations of various valves and pumps provided in the hot water storage tank unit 1 and the heat pump unit 60 are controlled by a control unit 70 electrically connected thereto. Hereinafter, each component of the hot water storage type water heater 100 will be described.

  The heat pump unit 60 functions as a heating means for heating (boiling) the low temperature water led from the hot water storage tank unit 1. The heat pump unit 60 includes a compressor 61, a heating heat exchanger 62, an expansion valve 63, and an air heat exchanger 64 connected in a ring shape with a refrigerant circulation pipe 65 to constitute a refrigeration cycle (heat pump cycle). The boiling heat exchanger 62 is for exchanging heat between the refrigerant flowing through the refrigerant circulation pipe 65 and the low-temperature water led from the hot water storage tank unit 1. The HP outlet side thermistor 66 is a temperature sensor for detecting the temperature of the high-temperature water heated by the boiling heat exchanger 62, and is provided in the heat pump outlet pipe 42. In order to obtain high-temperature water by the heat pump unit 60, it is preferable that the heat pump cycle is operated at a pressure exceeding the critical pressure using carbon dioxide as a refrigerant.

  On the other hand, the hot water storage tank unit 1 incorporates the following various parts and piping. The hot water storage tank 10 is for storing hot water. A water supply pipe 2 for supplying city water is connected to the lower part of the hot water storage tank 10, and a hot water supply side pipe 3 for supplying the stored hot water to the outside of the water heater is connected to the upper part of the hot water storage tank 10. It is branched from the tank upper pipe 43 and connected. In addition, the hot water heated by the heat pump unit 60 is introduced into the hot water storage tank 10 from the upper part of the tank, and the low temperature water is introduced from the lower part of the tank through the water supply pipe 2, thereby Hot water is stored so that a temperature difference occurs in the lower part.

  The hot water supply side pipe 3 branched and connected from the tank upper pipe 43 is connected to the hot water mixing valve 33 together with the hot water supply side pipe 4 branched from the water supply pipe 2, and hot water and hot water from the hot water supply side pipe 3 are connected. Water from the side pipe 4 is mixed and hot water adjusted to a predetermined temperature is supplied from the hot water supply pipe 5 to the external faucet.

  The hot water storage tank unit 1 includes a circulation pump 21 and a use side heat exchanger 22. The circulation pump 21 is a pump for circulating hot water through various pipes to be described later in the hot water storage tank unit 1. The use-side heat exchanger 22 uses the high-temperature water supplied from the hot water storage tank 10 and the heat pump unit 60 to heat the secondary-side heating target water (tub circulation water, heating circulation water, etc.). It is an exchanger. In the present embodiment, as a secondary side configuration of the use-side heat exchanger 22, a bathtub water circulation circuit 51 that circulates hot water in the bathtub 50 will be described as an example. The use side heat exchanger 22 is installed in the middle of the bathtub water circulation circuit 51. Further, a secondary circulation pump 52 for circulating the bathtub water and a bathtub outlet side thermistor 53 for detecting the temperature of the bathtub water discharged from the bathtub 50 are installed in the middle of the bathtub water circulation circuit 51. Yes.

  Next, the valves provided in the hot water storage tank unit 1 will be described. The hot water tank unit 1 includes a three-way valve 31 and a four-way valve 200. The three-way valve 31 is a flow path switching means having two inlets (a port and b port) through which hot water flows and one outlet (c port) through which hot water flows out. Either the a port or the b port The hot water path can be switched so that hot water flows in from the water. The four-way valve 200 has two inlets (second port 203, fourth port 205) through which hot water flows and two outlets (first port 202, third port 204) through which hot water flows out. And three paths, that is, a path that connects the first port 202 and the second port 203, a path that allows the first port 202 and the fourth port 205 to communicate, and a third port 204 and a fourth port 205. It is comprised so that a flow path form can be switched between the path | routes which connect.

  As described in the first embodiment, the four-way valve 200 has a configuration that suppresses an increase in the rotational torque of the valve body 230. Although not shown, the three-way valve 31 also has a configuration that suppresses an increase in the rotational torque of the valve body, like the four-way valve 200.

  The hot water storage tank unit 1 includes a tank lower pipe 40, a tank return pipe 44, a use side heat exchanger primary side (heat source side) inlet pipe 45, a use side heat exchanger primary side outlet pipe 46, and a bypass pipe 47. In addition.

  The tank lower pipe 40 is a flow path that connects the lower part of the hot water storage tank 10 and the a port of the three-way valve 31. The heat pump inlet pipe 41 is a flow path that connects the c port of the three-way valve 31 and the inlet side of the heat pump unit 60. The heat pump outlet pipe 42 is a flow path that connects the outlet side of the heat pump unit 60 and the fourth port 205 of the four-way valve 200. The tank upper pipe 43 is a flow path that connects the third port 204 of the four-way valve 200 and the upper part of the hot water storage tank 10. The tank return pipe 44 is a flow path that connects the first port 202 of the four-way valve 200 and a return port provided between the central portion and the lower portion of the hot water storage tank 10. The use side heat exchanger primary side inlet pipe 45 branches from between the hot water storage tank upper part 10 and the four-way valve 200 in the tank upper pipe 43 and is connected to the primary side inlet of the use side heat exchanger 22. It is. The use side heat exchanger primary side outlet pipe 46 is a flow path that connects the primary side outlet of the use side heat exchanger 22 and the b port of the three-way valve 31. The bypass pipe 47 is a flow path that branches from between the three-way valve 31 and the inlet side of the heat pump unit 60 in the heat pump outlet pipe 42 and is connected to the second port 203 of the four-way valve 200.

  At the time of boiling operation for heating the low-temperature water in the hot water storage tank 10, the three-way valve 31 is switched so as to communicate the a port and the c port, and the four-way valve 200 communicates the third port 204 and the fourth port 205. Thus, the circulation pump 21 and the heat pump unit 60 are operated. As a result, the low-temperature water in the lower part of the hot water storage tank 10 flows into the heating heat exchanger 62 through the tank lower pipe 40, the three-way valve 31, and the heat pump inlet pipe 41, and is boiled by the boiling heat exchanger 62. The high-temperature water returns to the upper part of the hot water storage tank 10 through the heat pump outlet pipe 42, the four-way valve 200, and the tank upper pipe 43.

  At the time of bypass operation performed before starting the boiling operation, the three-way valve 31 is switched so as to communicate the a port and the c port, and the four-way valve 200 communicates the first port 202 and the fourth port 205. Thus, the circulation pump 21 is operated. Thereby, the water led out from the lower part of the hot water storage tank 10 returns through the tank lower pipe 40, the three-way valve 31, the heat pump inlet pipe 41, the heating heat exchanger 62, the four-way valve 200, and the tank return pipe 44. Return to the hot water storage tank 10 from the mouth.

  At the time of the first recuperation operation in which the heat stored in the hot water storage tank 10 is used to retreat the bathtub 50, the three-way valve 31 is switched so that the b port and the c port are communicated, and the four-way valve 200 is the first one. The port 202 and the second port 203 are switched to communicate with each other, and the circulation pump 21 and the secondary side circulation pump 52 are operated. As a result, the hot water in the upper part of the hot water storage tank 10 flows into the use side heat exchanger 22 through the tank upper pipe 43 and the use side heat exchanger primary side inlet pipe 45, and exchanges heat with the circulating water in the bathtub. The water whose temperature has decreased after the heat exchange passes through the use side heat exchanger primary side outlet pipe 46, the three-way valve 31, the heat pump inlet pipe 41, the bypass pipe 47, the four-way valve 200, and the tank return pipe 44, and returns to the return port. Return to the hot water storage tank 10.

  At the time of the second recuperation operation in which the hot water boiled up by the heat pump unit 60 is directly used to retreat the bathtub 50, the three-way valve 31 is switched so that the b port and the c port communicate with each other. Is switched so that the third port 204 and the fourth port 205 communicate with each other, and the circulation pump 21, the secondary circulation pump 52, and the heat pump unit 60 are operated. As a result, the high-temperature water boiled in the boiling heat exchanger 62 passes through the heat pump outlet pipe 42, the four-way valve 200, the tank upper pipe 43, and the usage side heat exchanger primary side inlet pipe 45. It flows into the vessel 22 and exchanges heat with the circulating water in the bathtub. The temperature-reduced water after the heat exchange returns to the heating heat exchanger 62 through the use side heat exchanger primary side outlet pipe 46, the three-way valve 31, and the heat pump inlet pipe 41, and is boiled and recirculated. To do.

  In the hot water storage type hot water heater 100 described above, the water pressure is applied to the entire system after the initial water supply after the hot water storage tank unit 1 is installed outdoors such as a house or indoors such as a condominium, or after the water supply when resuming use. Sometimes, the increase in the rotational torque of the valve body of the three-way valve 31 or the four-way valve 200 is surely suppressed and the valve body can be smoothly rotated, so that the malfunction of the three-way valve 31 or the four-way valve 200 is surely prevented. can do.

DESCRIPTION OF SYMBOLS 1 Hot water storage tank unit 2 Water supply piping 3 Hot water supply side piping 4 Hot water supply side piping 5 Hot water supply piping 10 Hot water storage tank 21 Circulation pump 22 Use side heat exchanger 31 Three-way valve 33 Hot water mixing valve 40 Tank lower piping 41 Heat pump inlet piping 42 Heat pump outlet Pipe 43 Tank upper pipe 44 Tank return pipe 45 User side heat exchanger primary side inlet pipe 46 User side heat exchanger primary side outlet pipe 47 Bypass pipe 50 Bathtub 51 Bath water circulation circuit 52 Secondary side circulation pump 53 Bath outlet side Thermistor 60 Heat pump unit 61 Compressor 62 Boiling heat exchanger 63 Expansion valve 64 Air heat exchanger 65 Refrigerant circulation pipe 66 HP outlet side thermistor 70 Control unit 100 Hot water storage hot water heater 200 Four-way valve 201 Stepping motor 202 First port 203 Second port 204 Third port 205 Fourth port 2 10 Main body 210a Shaft insertion hole 211, 212, 213, 214 Flange 215, 216, 217, 218, 219, 220, 221, 222, 223, 224 O-ring 225, 226, 227, 228 Sheet packing 225a Groove 225b Conduction hole 230 Valve body 230a Shaft engagement hole 230b, 230c Conduction hole 231 Flow path 240 Shaft 240a, 240b End 250 Motor mounting plate 260 Closed space

Claims (4)

A main body provided with a plurality of ports;
A valve body rotatably installed in the main body and having a flow path formed therein;
A seal member for sealing between the valve body and the port;
A closed passage formed in the valve body and surrounded by the main body, the valve body, and the seal member, and a communication path that communicates the flow path inside the valve body;
A shaft that engages with an engagement hole formed in the valve body, and rotates the valve body;
Equipped with a,
Multiposition valve and the communication passage and the engaging hole has been configured in a common bore. A main body provided with a plurality of ports;
A valve body rotatably installed in the main body and having a flow path formed therein;
A seal member for sealing between the valve body and the port;
Is formed on the sealing member, the valve member and the body and a closed space in which the surrounded by the sealing member, and the communication path for communicating the one of the ports of the previous SL plurality of ports,
Multi-way valve equipped with. The multi-way valve according to claim 1 or 2, wherein the communication path is formed at a position avoiding a sliding portion between the valve body and the seal member. The multi-way valve according to any one of claims 1 to 3 ,
A hot water storage type water heater configured to be used in a state in which water pressure is applied to the plurality of ports of the multi-way valve, and switching a flow path of hot water with the multi-way valve.

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