JP6669280B2 - Valve device and hot water storage type hot water heater - Google Patents

Description

  The present invention relates to a valve device and a hot water supply type hot water supply device.

  The relief valve (1) disclosed in Patent Literature 1 below is configured as follows. An intake passage (45) for sucking air into the valve body (10) is provided in the lift shaft (40). The intake valve (70) normally closes the intake passage (45), and automatically opens the intake passage (45) when the pressure on the primary side becomes lower than the set negative pressure. The relief valve (1) is incorporated in the water heater with the intake valve (70) facing downward, as shown in FIG. 11 of the document. Therefore, normally, as shown in FIG. 10A of the same document, the ball valve element (75) is in a state in which the intake valve port (72) is closed by its own weight. The numbers in parentheses indicate reference numerals in the same document.

JP-A-2014-1759

  In the above-described conventional relief valve (1), when the pressure on the primary side exceeds the set pressure, water is discharged to the secondary side. Some of the drained water can remain around metal parts such as springs (38) and spring receivers (33) due to surface tension. As a result, the metal component may be corroded and the function of the relief valve (1) may be impaired.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a valve device and a hot-water storage type hot water supply device that can reliably prevent corrosion of parts of a relief valve mechanism.

The valve device of the present invention comprises a housing, an inlet port, an outlet port, a first chamber formed inside the housing and in fluid communication with the inlet port, and a first chamber formed in the housing and in fluid communication with the outlet port. Two chambers, a relief valve mechanism for discharging the fluid in the first chamber to the second chamber when the pressure in the first chamber exceeds the first pressure, at least a part of the relief valve mechanism is inside the second chamber The valve device is provided with an air passage that allows the atmosphere outside the housing to flow into the second chamber without passing through the outlet port when the pressure in the second chamber is equal to the atmospheric pressure.
Further, the hot water storage type hot water supply apparatus of the present invention includes a hot water storage tank and the valve device connected to the hot water storage tank.

  ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to prevent corrosion of the components of a relief valve mechanism reliably.

It is a figure which shows the valve apparatus by Embodiment 1, and the hot-water storage type water heater provided with the said valve apparatus. FIG. 2 is a rear view of the valve device shown in FIG. 1. FIG. 2 is a side sectional view of the valve device shown in FIG. 1. FIG. 2 is a side sectional view of the valve device shown in FIG. 1. FIG. 7 is a side sectional view of a valve device according to a second embodiment. FIG. 6 is an enlarged sectional view showing a check valve included in the valve device shown in FIG. 5. FIG. 6 is an enlarged sectional view showing a check valve included in the valve device shown in FIG. 5. FIG. 10 is a side sectional view of a valve device according to Embodiment 3. FIG. 14 is a side sectional view of a valve device according to a fourth embodiment.

  Hereinafter, embodiments will be described with reference to the drawings. In the drawings, common or corresponding elements are denoted by the same reference numerals, and redundant description will be simplified or omitted. The present disclosure may include any combination of configurations that can be combined among the configurations described in the following embodiments.

Embodiment 1 FIG.
FIG. 1 is a view showing a valve device 1 according to Embodiment 1 and a hot water supply type water heater 100 provided with the valve device 1. FIG. As shown in FIG. 1, the hot water supply type hot water supply device 100 includes a hot water storage tank 101 and a valve device 1. FIG. 1 shows a side view of the valve device 1. FIG. 1 is a schematic diagram, in which the scale of the hot water storage tank 101 is extremely smaller than the scale of the valve device 1. Actually, the hot water storage tank 101 is larger than the valve device 1. Although not shown, the hot water storage tank 101 is covered with a heat insulating material and is housed in a housing. A water supply pipe (not shown) for supplying water from a water source such as a tap is connected to a lower portion of the hot water storage tank 101. In the hot water storage tank 101, a water source water pressure acts. Other equipment included in the hot water supply type water heater 100, for example, a heating device for heating water in the hot water storage tank 101, a water pipe, a pump, a pressure reducing valve, a mixing valve, a heat exchanger, and the like are known, Illustration and explanation are omitted.

  The valve device 1 includes a housing 2, a lever 3, an inlet port 4, and an outlet port 5. The valve device 1 is used in a posture in which the outlet port 5 faces vertically downward. The inlet port 4 is connected to an upper part of the hot water storage tank 101 via a flow path 102. A drain passage (not shown) is connected to the outlet port 5. The valve device 1 functions as a pressure relief valve.

  When the water in the hot water storage tank 101 is heated, the internal pressure of the hot water storage tank 101 increases due to the volume expansion of the water. Further, the air dissolved in the water may be gasified and accumulated in the upper portion of the hot water storage tank 101. When the internal pressure of the hot water storage tank 101 exceeds the set pressure, the valve device 1 is opened, and the water and gasified air corresponding to the volume expansion are discharged out of the system through the valve device 1. As a result, the internal pressure of hot water storage tank 101 decreases. When the internal pressure of the hot water storage tank 101 becomes equal to or less than the set pressure, the valve device 1 is closed.

  The lever 3 is mounted outside the housing 2. By operating the lever 3, the valve device 1 can be forcibly opened. The inlet port 4 protrudes from the housing 2. The outlet port 5 protrudes from the housing 2. The axial direction of the inlet port 4 is perpendicular to the axial direction of the outlet port 5. In the present embodiment, the housing 2 is formed by a first casing 6 and a second casing 7. The first casing 6 and the second casing 7 are connected to each other by a plurality of screws 8.

  FIG. 2 is a rear view of the valve device 1 shown in FIG. FIG. 3 is a side sectional view of the valve device 1 shown in FIG. As shown in FIG. 3, a first chamber 9 and a second chamber 10 are formed inside the housing 2. First chamber 9 is in fluid communication with inlet port 4. The first chamber 9 is filled with a fluid, such as water, flowing from the inlet port 4. Second chamber 10 is in fluid communication with outlet port 5. The fluid, that is, water, in the second chamber 10 is discharged to the outside of the hot water supply type water heater 100 through the outlet port 5 and the drain passage.

  The valve device 1 includes a relief valve mechanism 11. When the pressure in the first chamber 9 exceeds the first pressure, the relief valve mechanism 11 discharges the fluid in the first chamber 9 into the second chamber 10. The first pressure corresponds to a set pressure at which the valve device 1 is opened. The first pressure is a pressure higher than the atmospheric pressure. At least a part of the relief valve mechanism 11 is located inside the second chamber 10. In the present embodiment, the relief valve mechanism 11 includes a diaphragm 12, a coil spring 13, a valve seat 14, a spring receiver 15, a first valve shaft 16, and a valve plug 17.

  The diaphragm 12 is made of, for example, rubber. Diaphragm 12 separates first chamber 9 and second chamber 10. The diaphragm 12 is displaced by receiving the pressure in the first chamber 9. The valve seat 14 is attached to a surface of the diaphragm 12 on the first chamber 9 side. The spring receiver 15 is attached to a surface of the diaphragm 12 on the second chamber 10 side. The coil spring 13 is located inside the second chamber 10. The coil spring 13 has a first end that contacts the spring receiver 15 and a second end that contacts the inner wall of the housing 2. The coil spring 13 is in a compressed state. The coil spring 13 urges the diaphragm 12 leftward in FIG.

  FIG. 4 is a side sectional view of the valve device 1 shown in FIG. FIG. 4 shows a state in which the valve device 1 is forcibly opened by the lever 3. As shown in FIG. 4, a passage 18 is formed in the valve seat 14. The passage 18 provides fluid communication between the first chamber 9 and the second chamber 10. A valve plug 17 is attached to the first valve shaft 16. The first valve shaft 16 projects through the passage 18 into the second chamber 10.

  When the valve plug 17 is seated on the valve seat 14, the valve device 1 is closed by closing the passage 18. When the valve plug 17 separates from the valve seat 14, the fluid in the first chamber 9 can flow into the second chamber 10 through the passage 18. That is, when the valve plug 17 is separated from the valve seat 14, the valve device 1 is opened. The first valve shaft 16 and the valve plug 17 are movable in the longitudinal direction of the first valve shaft 16. The first valve shaft 16 and the valve plug 17 are urged against the valve seat 14 in the valve closing direction by a spring (not shown). The “valve closing direction” is the rightward direction in FIGS. 3 and 4.

  In FIG. 3, the valve device 1 is "closed". The second valve shaft 19 has a front end facing the front end of the first valve shaft 16. When the valve device 1 is “closed”, a gap 20 is formed between the tip of the first valve shaft 16 and the tip of the second valve shaft 19. The second valve shaft 19 moves in the longitudinal direction of the second valve shaft 19 in conjunction with the movement of the lever 3. The second valve shaft 19 is displaced between the position in FIG. 4 protruding toward the inside of the second chamber 10 and the position in FIG. 3 retracted from the inside of the second chamber 10.

  Assuming that the pressure in the first chamber 9 has increased from the state of FIG. When the diaphragm 12 receives the pressure in the first chamber 9, the diaphragm 12 moves rightward in FIG. 3 against the urging force of the coil spring 13. At this time, the valve seat 14, the first valve shaft 16 and the valve plug 17 also move rightward in FIG. When the tip of the first valve shaft 16 comes into contact with the tip of the second valve shaft 19, the first valve shaft 16 and the valve plug 17 cannot move further to the right in FIG. When the pressure in the first chamber 9 further increases from that state, the diaphragm 12 and the valve seat 14 further move rightward in FIG. Open. " Thereafter, the fluid in the first chamber 9 flows into the second chamber 10 through the passage 18 and the pressure in the first chamber 9 decreases. When the pressure in the first chamber 9 decreases, the diaphragm 12 and the valve seat 14 move leftward in FIG. 3 by the urging force of the coil spring 13, and the valve device 1 returns from “open” to “closed”.

  The operation of the lever 3 is as follows. As shown in FIG. 4, the second valve shaft 19 protrudes, and the first valve shaft 16 is pushed by the second valve shaft 19, and is displaced leftward in FIG. As a result, the valve plug 17 is separated from the valve seat 14, and the valve device 1 is forcibly opened.

  After the hot water storage type water heater 100 is installed, an operation of filling the inside of the hot water storage tank 101 with water is performed. For example, in such a case, the valve device 1 is forcibly opened as shown in FIG. By doing so, the air in the hot water storage tank 101 can be discharged to the outside through the valve device 1.

  As shown in FIG. 3, the valve device 1 according to the present embodiment includes an air passage 21. The air passage 21 is a flow passage through which the atmosphere, that is, the air outside the housing 2 can flow into the second chamber 10 without passing through the outlet port 5 when the pressure in the second chamber 10 is equal to the atmospheric pressure. Road. In the present embodiment, the air passage 21 is formed as a hole penetrating the wall of the housing 2. The internal space of the second chamber 10 communicates with the atmosphere via a ventilation path 21.

  The valve device 1 according to the present embodiment includes an outlet passage 22. The outlet passage 22 is a passage through which fluid, that is, water flows from the second chamber 10 to the outlet port 5. The cylindrical portion 23 forms the outlet passage 22. The outlet passage 22 is formed by the inner peripheral surface of the cylindrical portion 23. The tubular portion 23 connects between the housing 2 and the outlet port 5.

  The housing 2 has a vent 24 and an outlet 25. The ventilation port 24 and the discharge port 25 open to the internal space of the second chamber 10. The ventilation path 21 is connected to the internal space of the second chamber 10 via the ventilation port 24. The ventilation port 24 corresponds to a boundary between the ventilation path 21 and the second chamber 10. The outlet port 5 is connected to the internal space of the second chamber 10 via the outlet passage 22 and the outlet 25. The discharge port 25 corresponds to a boundary between the outlet passage 22 and the second chamber 10.

  Water discharged from the first chamber 9 to the second chamber 10 may temporarily remain in the second chamber 10. For example, there is a possibility that water accumulated due to surface tension in the gap between the coil spring 13 of the relief valve mechanism 11 and the inner wall of the housing 2 temporarily remains. In the case of the present embodiment, when the outside air flows into the second chamber 10 through the ventilation path 21, such residual water quickly flows down and is discharged to the outlet passage 22 and the outlet port 5. You. For this reason, since water does not stay in the second chamber 10 for a long time, corrosion of a metal component such as the coil spring 13 can be reliably prevented. Therefore, it is possible to reliably prevent the function of the relief valve mechanism 11 from being impaired.

  In contrast, if it is assumed that there is no ventilation passage 21, the water remaining in the second chamber 10 is hard to be removed. For example, water accumulated due to surface tension in the gap between the coil spring 13 and the inner wall of the housing 2 may stay for a long time. The water that has stayed for a long time may corrode metal parts such as the coil spring 13 and impair the function of the relief valve mechanism 11.

  In the present embodiment, the vent 24 is located at a position opposite to the outlet 25 via the relief valve mechanism 11. For example, the vent 24 is located at a position opposite to the outlet 25 via the coil spring 13. As a result, the following effects can be obtained. The valve device 1 is used in a posture that has a predetermined direction with respect to a vertical line. For example, the valve device 1 is used in a posture in which the outlet port 5, the outlet passage 22, and the outlet 25 are on the lower side with respect to the second chamber 10. In this posture, the ventilation port 24 is located above the coil spring 13 of the relief valve mechanism 11. Therefore, the external air flowing through the ventilation path 21 flows from the ventilation port 24 to a position above the coil spring 13 of the relief valve mechanism 11. As a result, the water around the coil spring 13 of the relief valve mechanism 11 is reliably discharged to the outlet port 5 side without stagnation.

  In the present embodiment, the boundary 26 between the outlet passage 22 and the second chamber 10 is defined as follows. The end of a region where the inner peripheral surface of the outlet passage 22 is formed over the entire circumference is defined as a boundary 26. The distance between the coil spring 13 and the boundary 26 is L1. The inside diameter of the outlet passage 22 is L2. When the cross-sectional shape perpendicular to the longitudinal direction of the outlet passage 22 is not circular, the diameter of a circle having an area equal to the cross-sectional area perpendicular to the longitudinal direction of the outlet passage 22 may be set as the inner diameter L2 of the outlet passage 22. The inner diameter L2 of the outlet passage 22 is smaller than the inner diameter of the outlet port 5.

  When the distance L1 between the coil spring 13 and the boundary 26 is equal to or larger than the inner diameter L2 of the outlet passage 22, the following effects can be obtained. The action of retaining the water by the surface tension around the coil spring 13 is less likely to occur, and the water around the coil spring 13 can be more reliably and promptly discharged to the outlet port 5 side.

Embodiment 2 FIG.
Next, a second embodiment will be described with reference to FIGS. 5 to 7. The description will focus on differences from the first embodiment described above, and elements common or corresponding to the above-described elements will be described below. The same reference numerals are given to simplify or omit duplicate descriptions.

  FIG. 5 is a side sectional view of a valve device 1A according to the second embodiment. As shown in FIG. 5, the valve device 1 </ b> A includes a check valve 27 provided for the ventilation path 21. The check valve 27 shuts off the ventilation path 21 when the pressure in the second chamber 10 becomes higher than the atmospheric pressure. The check valve 27 prevents the fluid, that is, water, in the second chamber 10 from flowing out of the housing 2 through the ventilation path 21.

  6 and 7 are enlarged sectional views showing the check valve 27 included in the valve device 1A shown in FIG. As shown in FIG. 6, the check valve 27 includes a valve seat 28, a movable member 29, and a bottom wall 30. An opening 31 is formed at the center of the valve seat 28. The opening 31 faces the outer space of the housing 2. Vent holes 32 and 33 are formed in the bottom wall 30. The ventilation holes 32 and 33 face the space of the second chamber 10.

  The movable member 29 includes a seal member 29a and a guide rod 29b. The guide bar 29b protrudes downward. The guide rod 29b penetrates the ventilation hole 33 at the center of the bottom wall 30. The guide rod 29b is movable up and down with respect to the ventilation port 33. When the guide rod 29b moves up and down with respect to the vent 33, the movable member 29 is guided to move up and down. The seal member 29a is provided on the upper surface of the movable member 29. The seal member 29a is formed of an elastic material such as rubber, for example.

  The movable member 29 is movable between a closed position where the seal member 29a contacts the valve seat 28 and an open position where the seal member 29a is separated from the valve seat 28. FIG. 6 shows a state where the check valve 27 is “open”. As shown in FIG. 6, when the seal member 29 a is separated from the valve seat 28, the atmosphere outside the housing 2, that is, the air passes through the opening 31, the ventilation passage 21, and the ventilation holes 32 and 33, and the second chamber 10. It can flow into.

  When the seal member 29a contacts the valve seat 28, the check member 27a closes the opening 31, so that the check valve 27 is closed. FIG. 7 shows a state in which the check valve 27 shown in FIG. 6 is “closed”.

  According to the second embodiment, the following effects are obtained in addition to the same effects as in the first embodiment. As described above, after the hot water supply type water heater 100 is installed, the valve device 1A is forcibly opened by the lever 3 and water is supplied into the hot water storage tank 101 to fill the hot water storage tank 101 with water. An operation is performed. In the operation, when the inside of the hot water storage tank 101 is filled with water, a large amount of overflowed water flows from the first chamber 9 to the second chamber 10, and the second chamber 10 may be filled with water. Assuming that there is no check valve 27, at that time, water in the second chamber 10 may leak out of the housing 2 through the ventilation path 21. It is not preferable that the water leaked from the ventilation path 21 to the outside of the housing 2 accumulates inside the hot water supply type water heater 100 or leaks out from the housing of the hot water supply type water heater 100 to the outside. In contrast, in the second embodiment, the check valve 27 can reliably prevent the water in the second chamber 10 from leaking to the outside of the housing 2 through the ventilation path 21. It becomes possible.

  The valve device 1A is used in a posture in which the valve device has a predetermined orientation with respect to a vertical line, that is, a posture shown in FIG. In this position, the movable member 29 of the check valve 27 is held at the open position by gravity, as shown in FIG. For this reason, when the pressure in the second chamber 10 is equal to the atmospheric pressure, the check valve 27 is reliably opened, so that the air outside the housing 2 can more reliably flow into the second chamber 10. .

  The pressure in the second chamber 10 acts on the bottom surface of the movable member 29. When the pressure in the second chamber 10 becomes higher than the atmospheric pressure, the movable member 29 moves upward under the force of the pressure, and the check valve 27 is brought into the “closed” state in FIG.

  The movable member 29 may be configured to be able to float on liquid water. That is, the movable member 29 may be configured such that the specific gravity of the movable member 29 is smaller than the specific gravity of the liquid water. As a result, the following effects can be obtained. When the water is filled in the second chamber 10 and the water flows into the ventilation path 21 from the vents 32 and 33, the movable member 29 floats in the water, so that the movable member 29 moves upward and the check valve is provided. 27 becomes the "closed" state of FIG. For this reason, since the check valve 27 is more quickly and reliably brought into the “closed” state, it is possible to more reliably prevent the water in the second chamber 10 from leaking out of the housing 2 through the ventilation path 21. .

Embodiment 3 FIG.
Next, a third embodiment will be described with reference to FIG. 8, but a description will be given focusing on differences from the above-described first embodiment, and elements common or corresponding to the above-described elements will be denoted by the same reference numerals. To simplify or omit redundant description.

  FIG. 8 is a side sectional view of a valve device 1B according to the third embodiment. As shown in FIG. 8, the valve device 1B includes a guide wall 34 protruding toward the inside of the second chamber 10. The guide wall 34 protrudes from the boundary between the outlet passage 22 and the second chamber 10 toward the inside of the second chamber 10. The guide wall 34 has a guide surface 35 located inside the second chamber 10. The guide surface 35 is smoothly connected to the inner wall surface of the outlet passage 22. No step is formed at the boundary between the guide surface 35 and the inner wall surface of the outlet passage 22.

  According to the third embodiment, the following effect can be obtained in addition to the same effect as the first embodiment. The water in the lower part in the second chamber 10 can flow to the outlet passage 22 more smoothly along the guide surface 35. As a result, stagnation of water in the second chamber 10 can be more reliably prevented.

Embodiment 4 FIG.
Next, a fourth embodiment will be described with reference to FIG. 9, but a description will be given focusing on differences from the above-described first embodiment, and components common or corresponding to the above-described components will be denoted by the same reference numerals. To simplify or omit redundant description.

  FIG. 9 is a side sectional view of a valve device 1C according to the fourth embodiment. As shown in FIG. 9, in the valve device 1 </ b> C, the inner wall surface at the boundary between the outlet passage 22 and the second chamber 10 has a slope 36. The slope 36 is inclined with respect to the longitudinal direction of the outlet passage 22. In the flow path portion including the slope 36, the flow path cross-sectional area perpendicular to the flow direction of the water becomes larger as it is closer to the second chamber 10. That is, in the flow path portion including the inclined surface 36, the flow path cross-sectional area perpendicular to the longitudinal direction of the outlet passage 22 becomes larger as it is closer to the second chamber 10.

  According to the fourth embodiment, the following effect can be obtained in addition to the same effect as the first embodiment. The water in the lower part in the second chamber 10 can flow to the outlet passage 22 more smoothly along the slope 36. As a result, stagnation of water in the second chamber 10 can be more reliably prevented.

1, 1A, 1B, 1C Valve device, 2 housing, 3 lever, 4 inlet port, 5 outlet port, 9 first chamber, 10 second chamber, 11 relief valve mechanism, 12 diaphragm, 14 valve seat, 16 first valve Shaft, 17 valve plug, 18 passage, 19 second valve shaft, 21 air passage, 22 outlet passage, 24 vent, 25 outlet, 26 boundary, 27 check valve, 28 valve seat, 29 movable member, 34 guide wall , 35 guide surface, 36 slope, 100 hot water storage type hot water supply machine, 101 hot water storage tank

Claims (10)

A housing,
An entrance port,
An exit port,
A first chamber formed inside the housing and in fluid communication with the inlet port;
A second chamber formed inside the housing and in fluid communication with the outlet port;
A relief valve mechanism for discharging the fluid in the first chamber to the second chamber when the pressure in the first chamber exceeds the first pressure,
With
In a valve device in which at least a part of the relief valve mechanism is located inside the second chamber,
When the pressure in the second chamber is equal to the atmospheric pressure, a vent path that allows the atmosphere outside the housing to flow into the second chamber without passing through the outlet port,
Valve device. An outlet passage through which fluid flowing from the second chamber to the outlet port passes;
A guide wall that smoothly connects to an inner wall surface of the outlet passage, and protrudes toward the inside of the second chamber,
The valve device according to claim 1, further comprising: An outlet passage through which a fluid flowing from the second chamber to the outlet port passes;
2. The valve device according to claim 1, wherein, at a boundary portion between the second chamber and the outlet passage, a flow path cross-sectional area perpendicular to a flow direction of the fluid becomes larger as being closer to the second chamber. 3. The housing has a vent and an outlet that opens to the internal space of the second chamber,
The ventilation path is connected to the internal space of the second chamber via the ventilation port,
The outlet port is connected to the internal space of the second chamber through the outlet,
The valve device according to any one of claims 1 to 3, wherein the vent is located at a position opposite to the outlet through the relief valve mechanism. An outlet passage through which a fluid flowing from the second chamber to the outlet port passes;
The relief valve mechanism includes a spring located inside the second chamber,
The valve device according to any one of claims 1 to 4, wherein a distance between a boundary between the outlet passage and the second chamber and the spring is equal to or larger than an inner diameter of the outlet passage.   The valve device according to any one of claims 1 to 5, further comprising a check valve that shuts off the ventilation path when the pressure in the second chamber becomes higher than the atmospheric pressure.   The valve device according to any one of claims 1 to 5, further comprising a check valve configured to prevent fluid in the second chamber from flowing out of the housing through the ventilation path. The check valve includes a valve seat, and a movable member movable between a closed position in contact with the valve seat and an open position away from the valve seat,
8. The valve device according to claim 6, wherein the movable member is held at the open position by gravity when the valve device is in a predetermined direction with respect to a vertical line. The check valve includes a valve seat, and a movable member movable between a closed position in contact with the valve seat and an open position away from the valve seat,
The valve device according to any one of claims 6 to 8, wherein the movable member is capable of floating on water. Hot water storage tank,
The valve device according to any one of claims 1 to 9, which is connected to the hot water storage tank,
A hot water storage type water heater equipped with

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