WO2020111058A1

WO2020111058A1 - Exhaust valve

Info

Publication number: WO2020111058A1
Application number: PCT/JP2019/046162
Authority: WO
Inventors: 浅田哲夫
Original assignee: 株式会社テイエルブイ
Priority date: 2018-11-30
Filing date: 2019-11-26
Publication date: 2020-06-04
Also published as: JP7294674B2; JPWO2020111058A1

Abstract

An exhaust valve (100) that comprises: a casing (1) that has an inflow port (31), an outflow port (32), and a valve chamber (27) formed therein; a valve seat (4) that is provided in the valve chamber (27) and has a valve port (41) that allows the valve chamber (27) and the outflow port (32) to communicate; a float (5) that is arranged in the valve chamber (27) so as to be capable of moving and, when a gas flows in from the inflow port (31), keeps the valve port (41) open and allows the gas to flow out from the valve port (41) but, when a liquid flows in from the inflow port (31), is lifted by the buoyant force of the liquid, closes the valve port (41), and prevents the liquid from flowing out from the valve port (41); and a rectification part (8) that reduces the occurrence of vortexes around the valve seat (4) in the valve chamber (27).

Description

Exhaust valve

The technology disclosed here relates to exhaust valves.

Exhaust valves are known that allow gas to pass through when gas flows in and block passage of liquid when liquid flows in. For example, Patent Document 1 discloses an exhaust valve in which a valve seat and a float are housed in a casing. When the gas flows into the exhaust valve, the float is separated from the valve seat, and the gas is allowed to flow. On the other hand, when the liquid flows into the exhaust valve, the float floats according to the liquid level and closes the valve port to prevent the liquid from flowing out.

Japanese Utility Model Publication No. 63-12692

The exhaust valve as described above is used when initial air is exhausted from water pipes, etc. When the gas flows into the exhaust valve, if the flow of the gas is delayed in the exhaust valve, smooth exhaust may not be realized.

The technology disclosed here is made in view of such a point, and its purpose is to realize smooth exhaust through the exhaust valve.

The exhaust valve disclosed herein is a casing in which an inlet, an outlet, and a valve chamber are formed, a valve seat that is provided in the valve chamber, and has a valve port that connects the valve chamber and the outlet. It is movably arranged in the valve chamber and allows the gas to flow out of the valve opening when the gas flows in from the inflow port, while the liquid flows in when the liquid flows in from the inflow port. A float that floats up due to the buoyancy of the valve and closes the valve opening to prevent the liquid from flowing out from the valve opening; and a rectifying unit that reduces vortices generated around the valve seat in the valve chamber.

According to the exhaust valve, smooth exhaust through the exhaust valve can be realized.

FIG. 1 is a cross-sectional view of the exhaust valve in a valve open state in which the float is in the initial position. FIG. 2 is a cross-sectional view of the exhaust valve in the closed state. FIG. 3 is a cross-sectional view of the exhaust valve taken along the line III-III in FIG. FIG. 4 is a perspective view of the rectification unit. FIG. 5 is a piping diagram of the water supply system. FIG. 6 is a cross-sectional view of the exhaust valve according to the second embodiment. FIG. 7 is a cross-sectional view of an exhaust valve according to another embodiment.

Hereinafter, exemplary embodiments will be described in detail with reference to the drawings.

<<Embodiment 1>>
FIG. 1 is a cross-sectional view of an exhaust valve 100 in a valve open state according to the first embodiment. FIG. 2 is a cross-sectional view of the exhaust valve 100 in the closed state. 1 and 2, the float 5 is depicted as a front view, not as a cross-sectional view (hereinafter, the same applies to the cross-sectional view of the exhaust valve).

The exhaust valve 100 allows the gas such as air to flow out, while blocking the outflow of the fluid when a fluid such as water flows in. For example, the exhaust valve 100 is used when a large amount of initial air at the beginning of water supply is discharged from a pipe or the like.

The exhaust valve 100 includes a casing 1, a valve seat 4, a float 5, and a rectifying unit 8.

The casing 1 is formed with an inflow port 31 into which a fluid flows, an outflow port 32 from which a fluid flows out, and a valve chamber 27. The casing 1 is formed with a flow path 33 through which the fluid flowing from the inflow port 31 flows toward the outflow port 32. The inflow port 31 is arranged below the outflow port 32.

Specifically, the casing 1 has a cylindrical peripheral wall 11a that partitions a part of the valve chamber 27. The casing 1 may further include a ceiling 17 that partitions a part of the valve chamber 27 and closes one end of the peripheral wall 11a in the axial direction. More specifically, the casing 1 has a first casing 11 and a second casing 12. The first casing 11 has a cylindrical peripheral wall 11a extending in the direction of the axis X. The first casing 11 has a first opening 14 and a second opening 15 formed at both ends in the direction of the axis X. The first opening 14 is the inflow port 31. A male screw is formed on the outer peripheral surface of the first casing 11 at the end on the second opening 15 side.

The second casing 12 is formed in a bottomed tubular shape extending in the direction of the axis X. The second casing 12 has an opening 16 that opens in the direction of the axis X. The opening 16 is the outlet 32. The bottom of the second casing 12 forms a ceiling 17. A communication hole 18 is formed through the ceiling 17. The communication hole 18 is continuous (that is, communicates) with the opening 16.

The second casing 12 is arranged at the end of the first casing 11 on the second opening 15 side so that the ceiling 17 closes the second opening 15. The second casing 12 is attached to the first casing 11 by attaching the union nut 19 to the end of the first casing 11 on the second opening 15 side. The casing 1 has a valve chamber 27 defined by the peripheral wall 11 a and the ceiling 17. The lower end of the valve chamber 27 is continuous (that is, in communication) with the inflow port 31. A flow path 33 is formed inside the first casing 11 and the second casing 12 by the inflow port 31, the valve chamber 27, and the outflow port 32.

The valve seat 4 is provided in the valve chamber 27 (that is, between the inlet 31 and the outlet 32 in the casing 1). The valve seat 4 is attached to the ceiling 17. The valve seat 4 is screwed into the communication hole 18 of the second casing 12 from the first casing 11 side. The valve seat 4 has a valve opening 41 formed therethrough. The valve port 41 connects the valve chamber 27 and the outflow port 32.

The exhaust valve 100 may further include a float cover 61. The float cover 61 reduces the fluid that comes into contact with the float 5 out of the fluid that flows in from the inflow port 31. The float cover 61 is formed in a bottomed tubular shape or a bowl shape that opens upward. For example, the float cover 61 has a cylindrical peripheral wall 62 and a bottom 63 provided at one end of the peripheral wall 62. A plurality of communication holes 64 are formed through the bottom 63. The float cover 61 is arranged in the valve chamber 27. The float cover 61 accommodates the float 5 inside.

3 is a cross-sectional view of the exhaust valve 100 taken along the line III-III in FIG. Specifically, four guides 21 extending parallel to the axis X are formed on the inner peripheral surface of the first casing 11 of the casing 1. The four guides 21 are arranged at equal intervals in the circumferential direction around the axis X. The float cover 61 is supported by the four guides 21. Between the peripheral wall 62 of the float cover 61 and the peripheral wall 11a, a gap 33a which is a part of the fluid passage 33 is formed.

The float 5 is movably arranged in the valve chamber 27. The float 5 is configured to float on a liquid such as water. Specifically, the float 5 is formed in a hollow shape. The float 5 has a substantially spherical shape. The diameter (outer diameter) of the float 5 is smaller than the inner diameter of the peripheral wall 62. The float 5 allows the gas to flow out of the valve port 41 with the valve port 41 open when the gas flows in from the flow port 31, and floats by the buoyancy of the liquid when the liquid flows in from the flow port 31. The valve opening 41 is closed to prevent the liquid from flowing out from the valve opening 41.

In the initial state before the fluid flows into the casing 1, the float 5 is placed in the float cover 61, more specifically, on the bottom 63 in the casing 1, as shown in FIG. It is placed. Hereinafter, the position of the float 5 in the initial state will be referred to as the “initial position”.

The rectification unit 8 reduces vortices generated around the valve seat 4 in the valve chamber 27. FIG. 4 is a perspective view of the rectification unit 8. The rectification unit 8 has an inclined wall 81 that is inclined so that the flow passage cross-sectional area decreases toward the valve opening 41. The inclined wall 81 has a cylindrical shape centered on the axis X and is formed in a side surface of a truncated cone. That is, the inclined wall 81 is inclined with respect to the axis X. At the edge of the inclined wall 81 in the direction of the axis X, a ceiling 82 that serves as the upper base of the truncated cone is provided. An opening 82a is formed through the center of the ceiling 82. A part of the flow path 33 is formed inside the inclined wall 81. In the inclined wall 81, the fluid flows from the edge where the ceiling 82 is not provided to the edge where the ceiling 82 is provided. The cross-sectional area of the flow path 33 inside the inclined wall 81 decreases toward the downstream side in the fluid flow direction. Hereinafter, “upstream” means upstream in the fluid flow direction, and “downstream” means downstream in the fluid flow direction.

The inclined wall 81 includes an upstream portion 81a having a small angle with respect to the axis X and a downstream portion 81b having a large angle with respect to the axis X. The upstream portion 81a is a portion far from the valve seat 4, and the downstream portion 81b is a portion close to the valve seat 4. The upstream portion 81a is formed with a plurality of slits 81c extending from the upstream edge toward the downstream side. The slits 81c are arranged at equal intervals in the circumferential direction around the axis X. The width of the slit 81c is set to be the same as or slightly larger than the width of the guide 21 of the first casing 11.

As shown in FIGS. 1 and 2, the rectification unit 8 is attached to the ceiling 17 by sandwiching the ceiling 82 between the valve seat 4 and the ceiling 17 of the second casing 12. A portion of the valve seat 4 that is inserted into the communication hole 18 of the ceiling 17 penetrates the opening 82a. The upstream end of the upstream portion 81a extends to the gap 33a between the peripheral wall 11a and the float cover 61. The upstream end of the upstream portion 81a is in contact with the peripheral wall 11a. The guide 21 is fitted in the slit 81c.

The rectifying unit 8 configured as described above guides the gas and the liquid so that the gas and the liquid do not go to the corner 28 formed by the peripheral wall 11 a and the ceiling 17 but toward the valve opening 41.

Next, the operation of the exhaust valve 100 will be described. Hereinafter, a case where the gas flowing into the exhaust valve 100 is air and the liquid flowing into the exhaust valve 100 is water will be described as an example.

First, in the state before the fluid flows into the exhaust valve 100, as shown in FIG. 1, the float 5 is located at the initial position placed on the bottom 63 of the float cover 61. At this time, the float 5 is separated from the valve seat 4, and the valve port 41 is open.

In this state, when air flows into the casing 1 from the inflow port 31, the air flows into the valve port 41 through the flow passage 33 of the casing 1. At this time, the air flows to the valve port 41 through the gap 33a between the peripheral wall 11a of the first casing 11 of the casing 1 and the peripheral wall 62 of the float cover 61. Part of the air passes through the communication hole 64 of the float cover 61 and flows into the inside of the float cover 61. Since there is a gap between the peripheral wall 62 of the float cover 61 and the float 5, air flows to the valve port 41 through the gap. The air passes through the valve opening 41 and flows out of the casing 1 through the outlet 32. Since the float 5 is exposed to the circulating air, the float 5 can sway due to the circulation of the air. However, most of the air flows through the gap 33a between the peripheral wall 11a and the float cover 61, so that the swaying movement of the float 5 is reduced.

On the other hand, when water flows from the inflow port 31 into the casing 1, the water passes through the gap 33a between the peripheral wall 11a of the first casing 11 of the casing 1 and the peripheral wall 62 of the float cover 61, similarly to the air, and the valve opening 41 It flows toward. Part of the water passes through the communication hole 64, passes between the peripheral wall 62 of the float cover 61 and the float 5, and flows toward the valve port 41. At this time, the float 5 floats due to the buoyancy of water. The float 5 rises according to the water level in the casing 1. Eventually, the float 5 sits on the valve seat 4 and closes the valve opening 41, as shown in FIG. The float 5 closes the valve opening 41 before the water reaches the valve opening 41. This prevents water from flowing out of the exhaust valve 100. Since the float 5 is exposed to the circulating water, it can sway due to the circulating water. However, most of the water flows through the gap 33a between the peripheral wall 11a and the float cover 61, so that the swaying movement of the float 5 is reduced.

In this way, the exhaust valve 100 allows the passage of air while blocking the passage of water. Here, the generation of vortices around the valve seat 4 is reduced by the rectifying unit 8 when air passes. Specifically, the air that has flowed into the casing 1 through the inflow port 31 passes through the valve chamber 27 toward the valve seat 4. At this time, the air is guided to the inclined wall 81 of the rectifying unit 8. The inclined wall 81 guides the air toward the valve opening 41 without going to the corner 28 formed by the peripheral wall 11 a of the casing 1 and the ceiling 17. If the air heads to the corner portion 28, the air forms a vortex in the corner portion 28 and stays there. As a result, the efficiency of exhausting air from the exhaust valve 100 may decrease. On the other hand, due to the presence of the inclined wall 81, the air does not go to the corner portion 28. Since the inclined wall 81 is inclined toward the valve opening 41 so that the cross-sectional area of the flow path is small, the air guided to the inclined wall 81 is focused toward the valve opening 41. By doing so, the air passing through the valve chamber 27 smoothly flows into the valve opening 41. As a result, the exhaust efficiency of the exhaust valve 100 is improved, and as a result, smooth exhaust through the exhaust valve 100 can be realized.

Furthermore, the inclined wall 81 is inclined in stages, and the downstream side portion 81b has a smaller inclination angle with respect to the axis X than the upstream side portion 81a. Thereby, the air can be converged to the valve port 41 in stages, and the flow resistance can be reduced.

Further, the exhaust valve 100 is provided with a float cover 61, and most of the air flowing into the casing 1 through the inflow port 31 passes through the gap 33a between the peripheral wall 11a of the casing 1 and the float cover 61. .. When the air flows as it is along the peripheral wall 11a, it easily reaches the corners 28. On the other hand, the upstream side portion 81a of the inclined wall 81 extends to the gap 33a. The inclined wall 81 directs the air flowing along the peripheral wall 11a toward the valve port 41. Thus, in the exhaust valve 100 in which most of the air tends to flow along the peripheral wall 11a, the inclined wall 81 is provided, whereby the air can be smoothly focused toward the valve port 41. Furthermore, the upstream end of the upstream portion 81a is in contact with the peripheral wall 11a. Accordingly, the air passing through the gap 33a can be directed toward the valve opening 41 without leaking.

Further, when a vortex is generated in the corner portion 28, a part of the air forming the vortex becomes a downdraft, and the float 5 can be pressed downward. When the descending air current acts on the float 5 when water flows into the casing 1 and the float 5 floats, the valve closing by the float 5 can be delayed. If the valve closing is delayed, water may flow out from the exhaust valve 100. On the other hand, since the rectification unit 8 reduces the generation of the vortex in the corner portion 28, the descending air flow acting on the float 5 is reduced, and the float 5 can appropriately close the valve port 41.

The exhaust valve 100 configured in this way is installed in a water supply pipe, a pump, or the like (not shown). The exhaust valve 100 discharges initial air at the beginning of water supply, and closes when water advances and water enters the exhaust valve 100 to stop air discharge and prevent water discharge.

Hereinafter, an application example of the exhaust valve 100 will be described with reference to FIG. FIG. 5 is a piping diagram of the water supply system 9. The exhaust valve 100 is incorporated in the water supply system 9. Specifically, the water supply system 9 includes a water supply pump 91, a vacuum pump 92, and an exhaust valve 100. The water supply system 9 supplies water from a water tank or the like with a water supply pump 91. The vacuum pump 92 and the exhaust valve 100 form a priming mechanism for the water supply pump 91.

Specifically, a suction pipe 93 and a discharge pipe 94 are connected to the water supply pump 91. The water supply pump 91 sucks water through a suction pipe 93 and discharges the water through a discharge pipe 94.

The exhaust valve 100 is installed in an exhaust pipe 95 for exhausting water from the water intake side of the water supply pump 91 and guiding priming water to the water supply pump 91. The exhaust pipe 95 connects a first exhaust pipe 95a that connects the inflow port 31 of the exhaust valve 100 and the suction pipe 93, and a first exhaust pipe 95a that connects the outflow port 32 of the exhaust valve 100 and the suction port (not shown) of the vacuum pump 92. 2 exhaust pipes 95b are included.

The vacuum pump 92 is operated at the start of water supply by the water supply pump 91. The vacuum pump 92 sucks air in the suction pipe 93, and further in the piping on the upstream side of the suction pipe 93. By the suction by the vacuum pump 92, water (so-called priming water) is sucked from the upstream side of the suction pipe 93 toward the water supply pump 91. The priming action by the vacuum pump 92 and the operation of the water supply pump 91 are combined, so that the water supply from the water supply pump 91 is started early. At this time, the exhaust valve 100 allows the passage of air while the vacuum pump 92 is sucking air from the suction pipe 93. When water is eventually drawn into the suction pipe 93, the water enters the exhaust valve 100 via the first exhaust pipe 95a. The exhaust valve 100 closes when water enters and blocks passage of water. This prevents water from entering the vacuum pump 92.

At this time, in the exhaust valve 100, the rectification portion 8 reduces the generation of vortices in the corner portion 28, so that smooth exhaust through the exhaust valve 100 is realized. As a result, exhaust from the suction pipe 93, and eventually drawing of water into the suction pipe 93, can be quickly achieved. In addition to this, when water enters the exhaust valve 100, the valve opening 41 is closed without delay, so that the outflow of water from the exhaust valve 100 is appropriately blocked.

As described above, the exhaust valve 100 is provided in the valve chamber 27 and the casing 1 in which the inflow port 31, the outflow port 32, and the valve chamber 27 are formed, and the valve port 41 that connects the valve chamber 27 and the outflow port 32. Is arranged movably in the valve chamber 27, and allows the gas to flow out of the valve opening 41 while the valve opening 41 is open when the gas flows in from the inlet 31 while the gas inflow port 31 is opened. When the liquid flows in from the valve 5, it floats due to the buoyancy of the liquid and closes the valve opening 41 to prevent the liquid from flowing out of the valve opening 41, and reduces vortices generated around the valve seat 4 in the valve chamber 27. And a rectifying unit 8.

According to this configuration, when the gas flows into the casing 1 through the inflow port 31, the valve port 41 is open. The gas flows from the valve chamber 27 through the valve port 41 to the outflow port 32, and flows out of the casing 1 through the outflow port 32. On the other hand, when the liquid flows into the casing 1 through the inflow port 31, the valve port 41 is closed by the float 5. The liquid cannot flow from the valve chamber 27 toward the outflow port 32, and the outflow of the liquid from the casing 1 is blocked. Here, the rectification unit 8 reduces the vortex generated around the valve seat 4. As a result, the gas smoothly flows into the valve opening 41 from the valve chamber 27. As a result, the exhaust efficiency of the exhaust valve 100 is improved. Furthermore, the reduction of the generation of vortices by the rectifying unit 8 reduces the descending air flow acting on the float 5 when the float 5 floats. As a result, the valve port 41 can be smoothly closed when the liquid flows in.

The rectifying section 8 also has an inclined wall 81 that is inclined so that the flow passage cross-sectional area decreases toward the valve opening 41.

According to this configuration, the gas is guided by the inclined wall 81 and gradually converges toward the valve opening 41. This allows the gas to smoothly flow into the valve port 41 and reduce the generation of vortices.

Further, the exhaust valve 100 is formed in a bottomed cylindrical shape or a bowl shape that opens upward, accommodates the float 5 therein, and reduces a fluid that comes into contact with the float 5 out of the fluid flowing from the inflow port 31. The casing 1 further includes a cover 61, and the casing 1 has a cylindrical peripheral wall 11a that partitions a part of the valve chamber 27. The float cover 61 has a gap 33a between the peripheral wall 11a and the peripheral wall 11a which serves as a fluid passage 33. In this state, the upstream end of the inclined wall 81 in the fluid flow direction extends to the gap 33a.

According to this configuration, the float cover 61 is arranged in the casing 1, and the gap 33a serving as the flow path 33 is formed between the peripheral wall 11a of the casing 1 and the float cover 61. The upstream end of the inclined wall 81 extends to the gap 33a. Therefore, the gas flowing through the gap 33a is guided toward the valve opening 41 by the inclined wall 81. That is, in the casing 1 in which the gas tends to flow along the peripheral wall 11a, the gas can smoothly flow into the valve opening 41 by the inclined wall 81.

The casing 1 has a cylindrical peripheral wall 11a and a ceiling 17 that closes one end of the peripheral wall 11a. The peripheral wall 11a and the ceiling 17 define a part of a valve chamber 27, and the valve seat 4 is The rectification unit 8 provided on the ceiling 17 guides the gas and the liquid so that the gas and the liquid are directed toward the valve opening 41 without going to the corner 28 formed by the peripheral wall 11 a and the ceiling 17.

According to this configuration, the casing 1 has the corner portion 28 formed by the peripheral wall 11a and the ceiling 17. When gas flows into the corner portion 28, swirls are likely to occur. The rectification unit 8 guides the gas and the liquid so that the gas does not go to the corner 28 but toward the valve opening 41. This can reduce the generation of vortices.

Further, the outlet 32 is connected to the vacuum pump 92.

According to this structure, negative pressure acts on the outlet 32 by suction of the vacuum pump 92, and the fluid in the casing 1 is sucked through the outlet 32. In such a case, forced exhaust is performed via the exhaust valve 100, and the improvement of exhaust efficiency by the rectification unit 8 is particularly effective.

Further, the exhaust valve 100 is installed in an exhaust pipe 95 for exhausting water from the water intake side of the water supply pump 91 and guiding priming water to the water supply pump 91.

According to this configuration, the exhaust valve 100 is used as a part of the priming mechanism of the water supply pump 91. Since the exhaust valve 100 has the exhaust efficiency increased by the rectifying unit 8, the air can be quickly exhausted from the water intake side of the water supply pump 91. That is, the exhaust valve 100 can contribute to high priming performance. In addition, the exhaust valve 100 appropriately closes when water flows into the casing 1, so that the outflow of water to the downstream side of the exhaust valve 100 (for example, the inflow of water to the vacuum pump 92) is prevented. can do.

<<Embodiment 2>>
Next, the exhaust valve 200 according to the second embodiment will be described with reference to FIG. FIG. 6 is a sectional view of the exhaust valve 200.

Exhaust valve 200 differs from exhaust valve 100 in that it further includes a check valve. In the following, of the exhaust valve 200, the same components as those of the exhaust valve 100 are designated by the same reference numerals, and the description thereof will be omitted.

The exhaust valve 200 includes a casing 201, a valve seat 4, a float 5, a rectifying unit 8, and a check valve 207.

The casing 201 is provided with an inflow port 31, an outflow port 232, and a valve chamber 27. The casing 201 has a flow path 233 in which the fluid flowing from the inflow port 31 flows toward the outflow port 232. The casing 201 has a first casing 11, a second casing 212, and a third casing 213. The first casing 11 has the same configuration as the first casing 11 of the exhaust valve 100.

The second casing 212 has substantially the same configuration as the second casing 12 of the exhaust valve 100. The second casing 212 is formed in a bottomed tubular shape extending in the direction of the axis X. The second casing 212 has an opening 16 that opens in the direction of the axis X. The bottom of the second casing 212 forms the ceiling 17. The second casing 212 is provided with the first bearing 275 in the opening 16. The first bearing 275 is formed in an annular shape around the axis X. The first bearing 275 is connected to a base ring 277 formed concentrically with the first bearing 275 by an arm (not shown) extending in the radial direction around the axis X. The first bearing 275, the arm and the base ring 277 are formed in a flat plate shape as a whole. At the end of the opening 16 of the second casing 212, a step on which the base ring 277 is placed and a groove extending in the circumferential direction about the axis X at a position closer to the opening end than the step are formed. There is. When the base ring 277 is placed on the step, the C-shaped retaining ring 278 is fitted in the groove. As a result, the first bearing 275 is arranged in the opening 16.

In the third casing 213, a first opening 223 that opens downward along the direction of the axis X, and a second opening that is located above the first opening 223 and that opens in the radial direction with the axis X as the center. An opening 224 and a communication hole 225 that connects the first opening 223 and the second opening 224 are formed. A female screw is formed at the opening end of the first opening 223. The third casing 213 is screwed to the end of the first casing 11 on the side of the second opening 15 while the second casing 212 is placed on the end of the first casing 11 on the side of the second opening 15. As a result, the second casing 212 and the third casing 213 are attached to the first casing 11.

The casing 201 is formed with a valve chamber 27 for the float 5, which is partitioned by the peripheral wall 11 a and the ceiling 17. Further, in the casing 201, a valve chamber 279 for the check valve 207 is formed by the opening 16 of the second casing 212 and the first opening 223 of the third casing 213. A flow path 233 is formed inside the first casing 11, the second casing 212, and the third casing 213. A part of the flow path 233 is formed by a gap 33a between the peripheral wall 11a and the float cover 61. The second opening 224 is the outlet port 232. The outflow port 232 is arranged above the inflow port 31.

A second bearing 276 is formed on the third casing 213. The second bearing 276 is provided in the communication hole 225. The second bearing 276 is connected to a plurality of arms (not shown) extending from the inner peripheral surface of the communication hole 225. The second bearing 276 has an opening extending in the direction of the axis X.

The check valve 207 has a valve body 271 and a valve seat 272.

The valve body 271 is formed in a disc shape. The valve body 271 has an outer diameter larger than the inner diameter of the opening end of the opening 16. The valve body 271 has a first shaft 273 and a second shaft 274. The first shaft 273 and the second shaft 274 extend from both sides of the valve body 271 in the axial direction of the valve body 271. That is, the first shaft 273 and the second shaft 274 are arranged in a straight line. The first shaft 273 and the second shaft 274 are arranged at the center of the valve body 271.

The valve seat 272 is formed at the open end of the opening 16 of the second casing 212.

The valve body 271 is housed in the valve chamber 279. The first shaft 273 is inserted in the first bearing 275. The second shaft 274 is inserted in the second bearing 276. The first shaft 273 and the second shaft 274 are slidable in the direction of the axis X with respect to the first bearing 275 and the second bearing 276, respectively. When the fluid does not flow into the casing 201, the valve body 271 is seated on the valve seat 272 due to its own weight (see the solid line in FIG. 6). The valve body 271 closes the opening 16 by sitting on the valve seat 272.

Next, the operation of the exhaust valve 200 configured in this way will be described. The operation of the float 5 in the exhaust valve 200 is the same as the operation of the float 5 in the exhaust valve 100.

First, in the state before the fluid flows into the exhaust valve 200, the float 5 is located at the initial position placed on the bottom 63 of the float cover 61, and the valve port 41 is open. The valve body 271 is seated on the valve seat 272 to close the opening 16.

In this state, when air flows from the inflow port 31 into the casing 201, the air flows into the valve port 41 through the flow path 233 of the casing 201. The air that has passed through the valve port 41 pushes up the valve body 271 to open the valve. Air sequentially passes from the opening 16 through the first opening 223 and the communication hole 225 of the third casing 213, and flows out of the casing 201 through the outflow port 232.

On the other hand, when water flows from the inflow port 31 into the casing 201, the water flows toward the valve port 41 like the air. At this time, the float 5 floats due to the buoyancy of water. Eventually, the float 5 sits on the valve seat 4 and closes the valve opening 41. The float 5 closes the valve opening 41 before the water reaches the valve opening 41. This prevents water from flowing out of the exhaust valve 200.

At this time, in the exhaust valve 200, generation of vortices in the corner portion 28 is reduced by the rectifying portion 8, so that smooth exhaust is realized through the exhaust valve 200 and the valve is closed without delay when water enters. Will be realized.

The exhaust valve 200 configured in this way is installed in a water supply pipe, a pump, or the like (not shown). The exhaust valve 200 discharges the initial gas at the beginning of the water supply, and closes when the water supply proceeds and water enters the exhaust valve 200 to stop the gas discharge and prevent the water discharge.

Here, since the exhaust valve 200 has the check valve 207, even if the fluid flows into the casing 201 from the outlet 232, the check valve 207 is closed to prevent the fluid from flowing backward. For example, when the exhaust valve 200 is incorporated in the water supply system 9 as shown in FIG. 5, the operation of the vacuum pump 92 is stopped after the drawing of the priming water into the water supply pump 91 is completed. As a result, the suction force does not act on the outlet port 232 of the exhaust valve 200. On the other hand, since the water supply pump 91 sucks water through the suction pipe 93, the suction force of the water supply pump 91 can act on the inlet 31 of the exhaust valve 200. In such a case, even if air flows into the casing 201 from the outflow port 232, the check valve 207 closes the opening 16, so that the air is prevented from flowing backward through the exhaust valve 200. As a result, air is prevented from flowing into the suction pipe 93 via the exhaust pipe 95, and the water supply by the water supply pump 91 is appropriately continued.

As described above, the exhaust valve 200 is provided in the valve chamber 27 and the casing 201 in which the inflow port 31, the outflow port 232, and the valve chamber 27 are formed, and the valve port 41 that connects the valve chamber 27 and the outflow port 232. Is arranged movably in the valve chamber 27, and allows the gas to flow out of the valve opening 41 while the valve opening 41 is open when the gas flows in from the inlet 31 while the gas inflow port 31 is opened. When the liquid flows in from the valve 5, it floats due to the buoyancy of the liquid and closes the valve opening 41 to prevent the liquid from flowing out of the valve opening 41, and reduces vortices generated around the valve seat 4 in the valve chamber 27. And a rectifying unit 8.

According to this configuration, when the gas flows into the casing 201 through the inflow port 31, the valve port 41 is open. The gas flows from the valve chamber 27 to the outflow port 232 via the valve port 41, and flows out of the casing 201 via the outflow port 232. On the other hand, when the liquid flows into the casing 201 via the inflow port 31, the valve port 41 is closed by the float 5. The liquid cannot flow from the valve chamber 27 toward the outflow port 232, and the outflow of the liquid from the casing 201 is blocked. Here, the rectification unit 8 reduces the vortex generated around the valve seat 4. As a result, the gas smoothly flows into the valve opening 41 from the valve chamber 27. As a result, the exhaust efficiency of the exhaust valve 200 is improved. Furthermore, the reduction of the generation of vortices by the rectifying unit 8 reduces the descending air flow acting on the float 5 when the float 5 floats. As a result, the valve port 41 can be smoothly closed when the liquid flows in.

Further, the exhaust valve 200 is further arranged in the casing 201 between the valve seat 4 and the outflow port 232, and further includes a check valve 207 that prevents the fluid flowing from the outflow port 232 from flowing toward the valve seat 4. Prepare

According to this configuration, the fluid is prevented from flowing backward through the exhaust valve 200. As described above, when the exhaust valve 200 is used to guide the priming water to the water supply pump 91, the operation of the vacuum pump 92 is stopped after the introduction of the priming water to the water supply pump 91 is completed. That is, the suction from the inlet 31 of the exhaust valve 200 toward the outlet 232 is stopped. In that case, the suction of the water supply pump 91 may cause a flow from the outlet 232 to the inlet 31, that is, a flow that flows backward through the exhaust valve 200. On the other hand, since the exhaust valve 200 is provided with the check valve 207, the reverse flow of the fluid is prevented. Thereby, the appropriate water supply of the water supply pump 91 is maintained.

<<Other Embodiments>>
As described above, the embodiment has been described as an example of the technique disclosed in the present application. However, the technique of the present disclosure is not limited to this, and is also applicable to the embodiment in which changes, replacements, additions, omissions, etc. are appropriately made. Further, it is also possible to combine the constituent elements described in the above-described embodiment to form a new embodiment. In addition, in the constituent elements described in the accompanying drawings and the detailed description, not only constituent elements essential for solving the problem but also constituent elements not essential for solving the problem in order to exemplify the above-mentioned technology. Can also be included. Therefore, it should not be immediately recognized that the non-essential components are essential by the fact that the non-essential components are described in the accompanying drawings and the detailed description.

For example, the configurations of the

casings

1 and 201 are merely examples, and any configuration may be adopted. For example, the

casing

21 and 201 do not need to be provided with the guide 21. That is, the support structure of the float cover 61 is not limited to the structure using the guide 21.

Also, the float cover 61 may be omitted. In that case, the

casings

1 and 201 are provided with a float receiver that supports the float 5 in the initial position. The gas and the liquid flow between the peripheral wall 11 a and the float 5.

The configuration of the rectification unit 8 is merely an example, and any configuration can be adopted as long as the generation of vortices around the valve seat 4 can be reduced. For example, the inclination angle of the inclined wall 81 with respect to the axis X may not change stepwise but may change continuously or may be constant. The upstream end of the inclined wall 81 does not have to extend to the gap 33a. The rectification unit 8 may be attached to the ceiling 17 with a bolt or the like. The rectifying portion 8 may be formed in a shape that fills the corner portion 28 instead of the wall shape.

The rectification unit may have a configuration as shown in FIG. The exhaust valve 300 of FIG. 7 is different from the exhaust valve 100 in the configuration of the rectifying unit. Of the configurations of the exhaust valve 300, the same components as those of the exhaust valve 100 are designated by the same reference numerals and description thereof will be omitted. The casing 301 of the exhaust valve 300 has a first casing 11 and a second casing 312. The second casing 312 is formed in a bottomed tubular shape in which the opening 16 is formed. The second casing 312 has a ceiling 317 that partitions a part of the valve chamber 27. The rectifying unit 308 is formed integrally with the ceiling 317. For example, the rectification unit 308 is integrally molded with the second casing 312. The rectifying section 308 has an inclined wall 381 that is inclined so that the flow passage cross-sectional area decreases toward the valve opening 41. The inclined wall 381 has a cylindrical shape centered on the axis X and is formed in a side surface of a truncated cone. The inclined wall 381 is formed with a plurality of slits 381c extending from the upstream edge toward the downstream side. The slits 381c are arranged at equal intervals in the circumferential direction around the axis X. The width of the slit 381c is set to be the same as or slightly larger than the width of the guide 21 of the first casing 11. The upstream end of the inclined wall 381 extends to the gap 33a between the peripheral wall 11a and the float cover 61. The upstream end of the inclined wall 381 is not in contact with the peripheral wall 11a. The guide 21 is fitted in the slit 381c.

Exhaust valves

100 and 200 are not limited to those used for priming water supply pump 91. The

exhaust valves

100 and 200 can be applied to a portion that requires passage of gas and prevention of passage of liquid.

As explained above, the technology disclosed here is useful for exhaust valves.

100, 200, 300

Exhaust valve

1, 201, 301 Casing 11a Peripheral wall 17,317 Ceiling 27 Valve chamber 28 Corner 31 Inlet 32,232 Outlet 33,233 Flow passage 33a Gap 4 Valve seat 41 Valve port 5 Float 61 Float Cover 207 Check valve 8,308 Rectifier 81,381 Sloping wall 91 Water supply pump 92 Vacuum pump 95 Exhaust pipe

Claims

A casing in which an inlet, an outlet, and a valve chamber are formed,
A valve seat provided in the valve chamber, the valve seat having a valve opening communicating the valve chamber and the outflow port;
It is movably arranged in the valve chamber and allows the gas to flow out of the valve opening when the gas flows in from the inflow port, while the liquid flows in when the liquid flows in from the inflow port. A float that floats up due to the buoyancy of the valve and closes the valve opening to prevent the outflow of liquid from the valve opening;
An exhaust valve, comprising: a rectifying unit that reduces vortices generated around the valve seat in the valve chamber.
The exhaust valve according to claim 1,
The said rectification|straightening part is an exhaust valve which has an inclined wall inclined so that a flow path cross-sectional area may become small toward the said valve opening.
The exhaust valve according to claim 1 or 2,
The casing has a cylindrical peripheral wall and a ceiling that closes one end of the peripheral wall,
The peripheral wall and the ceiling partition a part of the valve chamber,
The valve seat is provided on the ceiling,
The rectification unit is an exhaust valve that guides the gas and the liquid so that the gas and the liquid are directed toward the valve opening without going to a corner formed by the peripheral wall and the ceiling.
The exhaust valve according to claim 2,
A bottom cover which is opened upward and is formed in a bottomed cylinder shape, and which accommodates the float therein and further includes a float cover for reducing a fluid that comes into contact with the float among fluids flowing in from the inflow port,
The casing has a cylindrical peripheral wall that partitions a part of the valve chamber,
The float cover is disposed in the valve chamber with a gap serving as a fluid flow path between the float cover and the peripheral wall,
An exhaust valve in which the upstream end of the inclined wall in the fluid flow direction extends to the gap.
The exhaust valve according to any one of claims 1 to 4,
The exhaust valve further comprising a check valve, which is arranged in the casing between the valve seat and the outflow port and prevents a fluid flowing from the outflow port from flowing toward the valve seat.
The exhaust valve according to any one of claims 1 to 5,
The outlet is an exhaust valve connected to a vacuum pump.
The exhaust valve according to claim 6,
An exhaust valve installed in an exhaust pipe for exhausting water from the water intake side of the water supply pump and guiding priming water to the water supply pump.