WO2019167586A1

WO2019167586A1 - Shock absorber

Info

Publication number: WO2019167586A1
Application number: PCT/JP2019/004369
Authority: WO
Inventors: 杉江悠一
Original assignee: 株式会社テイエルブイ
Priority date: 2018-02-28
Filing date: 2019-02-07
Publication date: 2019-09-06
Also published as: JP7311896B2; JPWO2019167586A1

Abstract

A shock absorber 1 is provided with a casing 10, and an absorption body 40 which moves when pushed by water flowing inside the casing 10. A first flow passage F1 is formed within the casing 10. A through-hole 46 which constitutes part of a second flow passage F2 and through which water flows is formed in the absorption body 40. When a backflow occurs, the absorption body 40 closes an inflow opening 23 to shut off the first flow passage F1 but allows water to flow through the second flow passage F2. In a normal flow state, the absorption body 40 is located closer to an outflow opening 33 than in the backflow state but maintains the outflow opening 33 open, thereby allowing water to flow through the first water flow passage F1 and the second water flow passage F2.

Description

Shock absorber

The technology disclosed here relates to an impact absorber.

Conventionally, fluid systems in which fluids such as water circulate are well known. The fluid system includes various devices, and each device is connected by piping. For example, the fluid system disclosed in Patent Document 1 includes a heat exchanger, and piping is connected to an inlet and an outlet of the heat exchanger. In addition, a pipe connected to the outlet of the heat exchanger is provided with an on-off valve that switches the flow / shutoff of hot water.

JP 2014-74502 A

By the way, in a fluid system, an impact such as a water hammer often occurs. For example, in a fluid system such as that disclosed in Patent Document 1, when a valve on a pipe connected to an outlet of a heat exchanger is rapidly closed, a water hammer may be generated in the pipe. When a water hammer occurs, a large impact is generated and the impact propagates through the fluid in the pipe. In the case of this example, there is a possibility that the impact acts on the heat exchanger. On the other hand, it is conceivable to install an impact absorber on the downstream side of the heat exchanger. Moreover, such an impact does not necessarily occur only on the downstream side of the device to be protected, but may occur on the upstream side of the device. Therefore, the shock absorber is arranged according to the positional relationship between the place where the occurrence of the shock is expected and the device to be protected from the shock. That is, the shock absorber is required to be able to cope with both the impact from the upstream side and the impact from the downstream side. Further, since the shock absorber is incorporated in the fluid system, it is necessary to ensure a sufficient flow rate in a normal use state where no shock is generated.

The technology disclosed herein has been made in view of the above points, and its purpose is to provide an impact absorber that can mitigate impacts from both upstream and downstream while ensuring a normal flow rate. It is to provide.

The shock absorber disclosed herein includes a casing having an inlet through which fluid flows in and an outlet through which fluid flows out, and an absorber that is disposed in the casing and is moved by being pushed by the fluid flowing in the casing. A first flow path that connects the inlet and the outlet is formed in the casing, and the absorber has a part of a second flow path that connects the inlet and the outlet. In the reverse flow in which the fluid passes from the outlet to the inlet, the absorber closes the inlet and blocks the first flow path, At the time of forward flow in which fluid flows through the second flow path and fluid flows from the inlet to the outlet, the absorber is positioned closer to the outlet than at the time of reverse flow. Maintaining the open state, the first Road and through the second flow path circulating a fluid.

According to the impact absorber, it is possible to provide an impact absorber that can mitigate impacts from both upstream and downstream while securing a normal flow rate.

FIG. 1 is an exploded perspective view of the shock absorber according to the first embodiment. FIG. 2 is a longitudinal sectional view of the shock absorber during forward flow. FIG. 3 is a longitudinal sectional view of the shock absorber during reverse flow. FIG. 4 is a configuration diagram of the fluid system. FIG. 5 is a longitudinal sectional view of the shock absorber according to the second embodiment, and shows a state in which an impact in the forward flow direction is applied. FIG. 6 is a longitudinal sectional view of the shock absorber according to the second embodiment, and shows a state in which an impact in the reverse flow direction is applied.

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

Embodiment 1
FIG. 1 is an exploded perspective view of an impact absorber 1 according to the first embodiment. FIG. 2 is a longitudinal sectional view of the shock absorber 1 during forward flow. FIG. 3 is a longitudinal sectional view of the shock absorber 1 during backflow.

The shock absorber 1 includes a casing 10 and an absorber 40.

Casing 10 has a cylindrical portion 20 and a lid 30 attached to the cylindrical portion 20. The cylinder part 20 is formed in the bottomed substantially cylindrical shape. Specifically, the cylindrical portion 20 includes a substantially cylindrical peripheral wall 21 having the X axis as an axis, and a substantially disc-shaped bottom wall 22 connected to one end of the peripheral wall 21 in the X axis direction. . A substantially circular inlet 23 is formed through the bottom wall 22. The central axis of the inflow port 23 coincides with the X axis. A bearing 24 that supports the absorber 40 is provided on the bottom wall 22. The bearing 24 is disposed substantially at the center of the inlet 23 and is connected to the bottom wall 22 via two beams 25. The axis of the bearing 24 coincides with the X axis. The two beams 25 extend in the radial direction about the X axis. The two beams 25 are arranged on a substantially straight line. As shown in FIGS. 2 and 3, a protrusion 26 is provided on the inner surface of the bottom wall 22 (that is, the inner surface of the casing 10). The protrusion 26 is formed in an annular shape so as to surround the inflow port 23.

The lid 30 is formed in a substantially annular shape. The lid 30 is screwed to the end of the peripheral wall 21 in the X-axis direction where the bottom wall 22 is not provided. The lid 30 includes a ring 31 formed in an annular shape and a bearing 34 that supports the absorber 40. On the outer peripheral surface of the ring 31, a male screw that is screwed into the peripheral wall 21 is formed. A substantially circular outlet 33 is formed by the opening of the ring 31. The central axis of the outflow port 33 coincides with the X axis. The bearing 34 is disposed substantially at the center of the ring 31 and is connected to the ring 31 through three beams 35. The three beams 35 extend in the radial direction around the X axis. The three beams 35 are arranged at equal intervals around the X axis. The axis of the bearing 34 coincides with the X axis. The lid 30 is provided with three stoppers 36 protruding inside the casing 10. The three stoppers 36 are arranged at equal intervals around the X axis. More specifically, each stopper 36 is provided at a connection portion between each beam 35 and the ring 31.

The absorber 40 has a receiving part 41 and a shaft 50.

The receiving portion 41 has a substantially circular outer shape centering on the X axis. The outer diameter of the receiving portion 41 is smaller than the inner diameter of the peripheral wall 21 and larger than the inner diameter of the inflow port 23. The shaft 50 penetrates the receiving portion 41 and extends in the X-axis direction. The axis of the shaft 50 coincides with the X axis. That is, the shaft 50 is provided at the center of the receiving portion 41. Both end portions of the shaft 50 are fitted in the bearing 24 and the bearing 34 so as to be slidable in the X-axis direction. Thus, the absorber 40 is arranged in the casing 10 in a state in which the absorber 40 can move in the X-axis direction.

As shown in FIGS. 2 and 3, the peripheral portion of the receiving portion 41 is formed flat. An inner portion of the receiving portion 41 with respect to the peripheral portion is formed in a curved shape.

Specifically, a first receiving surface 42 on which a fluid flowing in from the inflow port 23 collides is formed in a portion of the receiving portion 41 facing the inflow port 23. The first receiving surface 42 is inclined with respect to the X axis. More specifically, the first receiving surface 42 is a concave curved surface that is curved so that the center (that is, the portion through which the X axis passes) is most concave. On the other hand, a portion of the receiving portion 41 that faces the outflow port 33 is formed with a second receiving surface 43 on which the fluid flowing backward from the outflow port 33 collides. Most of the second receiving surface 43 is inclined with respect to the X axis. More specifically, the second receiving surface 43 is a convex curved surface that is curved so that the center (that is, the portion through which the X axis passes) bulges most.

A circular concave groove 44 extending in the circumferential direction around the X axis is formed on the surface of the peripheral portion of the receiving portion 41 facing the inflow port 23. An annular rubber 45 is fitted in the concave groove 44. The rubber 45 comes into contact with the protruding portion 26 of the casing 10 when the absorber 40 moves toward the inflow port 23. On the other hand, the surface of the peripheral portion of the receiving portion 41 facing the outlet 33 comes into contact with the stopper 36 of the casing 10 when the absorber 40 moves toward the outlet 33.

The receiving portion 41 has six through holes 46 through which fluid passes. Specifically, one end of each through hole 46 opens to the first receiving surface 42 and the other end opens to the second receiving surface 43. The through hole 46 penetrates the receiving portion 41 substantially parallel to the X axis. The six through holes 46 are arranged at equal intervals in the circumferential direction around the X axis.

In the state where the absorber 40 is disposed in the casing 10, a gap is formed between the peripheral wall 21 of the casing 10 and the receiving portion 41 of the absorber 40. That is, in the casing 10, the 1st flow path F1 (two-dot chain line of FIG. 2) which connects the inflow port 23 and the outflow port 33 through the clearance gap between the surrounding wall 21 and the receiving part 41 is formed. In addition, a second flow path F <b> 2 (broken line in FIGS. 2 and 3) that connects the inflow port 23 and the outflow port 33 through the through hole 46 of the absorber 40 is formed in the casing 10.

The shock absorber 1 configured in this manner is incorporated into a fluid system 9 as shown in FIG. 4, for example. FIG. 4 is a configuration diagram of the fluid system 9. The fluid system 9 includes devices such as a heat exchanger 91 and a valve 92, and pipes 93 that connect the devices. A valve 92 is disposed downstream of the heat exchanger 91. Water circulates through the heat exchanger 91, the valve 92, and the pipe 93 (at least the section shown). Water is an example of a fluid. The fluid system 9 further includes two shock absorbers 1. Here, the shock absorber 1 disposed on the upstream side of the heat exchanger 91 is referred to as a first shock absorber 1A, and the shock absorber 1 disposed on the downstream side of the heat exchanger 91 and on the upstream side of the valve 92. Is referred to as a second shock absorber 1B. Both the first shock absorber 1A and the second shock absorber 1B have the above-described configuration. When the first shock absorber 1A and the second shock absorber 1B are not distinguished from each other, they are simply referred to as “shock absorber 1”. The first shock absorber 1A reduces the shock that propagates to the heat exchanger 91 from the upstream side of the first shock absorber 1A. The second shock absorber 1B reduces the shock that propagates to the heat exchanger 91 from the downstream side of the second shock absorber 1B.

Hereinafter, the operation of the first shock absorber 1A and the second shock absorber 1B will be described.

When the valve 92 is open, in the fluid system 9, water flows in the direction from the heat exchanger 91 to the valve 92. This flow is referred to as “forward flow”. During forward flow, in the shock absorber 1, water flows into the casing 10 from the inlet 23, and water flows out of the casing 10 through the outlet 33. At this time, as shown in FIG. 2, the absorber 40 is pushed by the water flowing into the casing 1, moves toward the outlet 33, and contacts the stopper 36. Since the absorber 40 stops at the position where it contacts the stopper 36, the absorber 40 does not close the outlet 33, and the outlet 33 is kept open. In addition, since the absorber 40 is moving toward the outflow port 33, the inflow port 23 is naturally open.

In this state, the first flow path F1 is open. That is, the water flowing through the pipe 93 flows into the casing 10 from the inlet 23. The inflow direction of water from the inflow port 23 is substantially parallel to the X axis. The water that flows in generally proceeds in the X-axis direction and collides with the first receiving surface 42 of the absorber 40. Since the first receiving surface 42 is formed in a concave curved surface that is curved so that the center is recessed, water that has collided with the first receiving surface 42 has a deep portion of the concave curved surface along the first receiving surface 42, that is, the first 1 Flows so as to turn toward the center of the receiving surface 42. At the center of the first receiving surface 42, water from various radial directions gather and collide with each other. Thereafter, the water flows toward the outer peripheral side of the first receiving surface 42, passes through the gap between the receiving portion 41 and the peripheral wall 21, and flows toward the second receiving surface 43. Finally, water flows out of the casing 10 through the outlet 33.

In addition, the second flow path F2 is also opened. That is, a part of the water flowing in from the inflow port 23 passes through the absorber 40 from the first receiving surface 42 side to the second receiving surface 43 side through the through hole 46. Thus, the water that has passed through the absorber 40 also flows out of the casing 10 through the outlet 33.

Here, when a water hammer occurs on the upstream side of the shock absorber 1, the shock propagates to the shock absorber 1. That is, water can flow into the shock absorber 1 vigorously. However, the impact absorber 1 absorbs the impact of water and reduces the impact that propagates downstream of the impact absorber 1. Specifically, as described above, the water flowing in from the inlet 23 first collides with the absorber 40. This reduces the impact of water. At this time, since the first receiving surface 42 is inclined (more specifically, curved) so as to be recessed toward the center, the water colliding with the first receiving surface 42 gathers at the center of the first receiving surface 42. To go. In this way, the impact of water is also weakened by the collision of water gathering at the center of the first receiving surface 42. Thereafter, the water flows through the first flow path F <b> 1 bent or curved so as to bypass the absorber 40. The impact of water is also weakened by the channel resistance at this time. Furthermore, a part of the water passes through the through hole 46 of the absorber 40. The impact of water is also weakened by the flow path resistance of the through hole 46 at this time.

In addition, when the water flowing through the pipe 93 flows into the casing 10 from the inlet 23, the water flows in substantially parallel to the X axis. The water that flows in generally proceeds in the X-axis direction and collides with the first receiving surface 42 of the absorber 40. Since the first receiving surface 42 is inclined so that the center swells, a part of the impact of water colliding with the first receiving surface 42 escapes along the first receiving surface 42. That is, the impact received by the absorber 40 is slightly reduced. Moreover, the impact received by the absorber 40 is also slightly reduced by a part of the water colliding with the first receiving surface 42 flowing into the through hole 46.

Thus, the impact of water flowing out of the shock absorber 1 during forward flow is weakened. For example, the impact of water propagating to the heat exchanger 91 is reduced by the first shock absorber 1A. Similarly, the impact of water propagating to the valve 92 is reduced by the second shock absorber 1B.

As another case, a water hammer may occur on the downstream side of the shock absorber 1. For example, a water hammer may occur upstream of the valve 92 when the valve 92 is closed and the flow of water is suddenly interrupted. In this case, the impact propagates from the location where the water hammer is generated to the upstream side and the downstream side. On the upstream side of the place where the water hammer is generated, water flows in the direction opposite to that in the forward flow. This flow is called “back flow”. During the reverse flow, water flows into the impact absorber 1 from the outlet 33 vigorously. However, the impact absorber 1 absorbs the impact of water and reduces the impact that propagates upstream of the impact absorber 1.

Specifically, during the reverse flow, water flows into the casing 10 from the outlet 33 in the shock absorber 1. The water that flows in from the outlet 33 first collides with the absorber 40. This reduces the impact of water. At this time, as shown in FIG. 3, the absorber 40 is pushed by the water flowing into the casing 1, moves toward the inflow port 23, and contacts the protruding portion 26. That is, the absorber 40 closes the inflow port 23. Thereby, the 1st flow path F1 is interrupted | blocked.

However, the opening of the second flow path F2 is maintained. That is, the water that flows in from the outlet 33 passes through the absorber 40 from the second receiving surface 43 side to the first receiving surface 42 side through the through hole 46. The water that has passed through the absorber 40 flows out of the casing 10 through the inflow port 23. The impact of water is also weakened by the flow path resistance when passing through the through hole 46. In other words, only water that has passed through the through hole 46 and whose impact has weakened flows out from the shock absorber 1 to the upstream side. If the shock absorber 1 completely blocks the flow of water, all the water shocks flowing into the shock absorber 1 must be received by the absorber 40 or the like. On the other hand, the impact on the absorber 40 etc. can be relieved by flowing a part of water through the second flow path F2.

In addition, when the water which distribute | circulates the piping 93 flows in into the casing 10 from the outflow port 33, it flows in in parallel with a X-axis substantially. That is, the inflow direction of water from the outlet 33 is substantially parallel to the X axis. The inflowing water generally travels in the X-axis direction and collides with the second receiving surface 43 of the absorber 40. Since the second receiving surface 43 is inclined (more specifically, curved) so that the center swells, a part of the impact of water colliding with the second receiving surface 43 is along the second receiving surface 43. And run away. That is, the impact received by the absorber 40 is slightly reduced. Further, when the absorber 40 contacts the protruding portion 26, the rubber 45 contacts the protruding portion 26, so that the impact when the absorber 40 closes the inlet 23 is alleviated.

Thus, the impact of water flowing out from the shock absorber 1 to the upstream side during backflow is weakened. For example, when a water hammer occurs on the upstream side of the valve 92, the impact transmitted to the heat exchanger 91 is reduced by the second shock absorber 1B.

Thus, the shock absorber 1 can alleviate the impact from both the upstream side and the downstream side, and reduce the impact of the flowing water. In addition, at the time of forward flow, the open state of the first flow path F1 is maintained without closing the inflow port 23 and the outflow port 33, so that it is possible to secure a flow rate through the shock absorber 1. That is, it is possible to ensure a normal flow rate in which no water hammer or the like is generated.

As described above, the shock absorber 1 is disposed in the casing 10 having the inlet 23 into which water (fluid) flows in and the outlet 33 from which water flows out, and pushes against the water flowing in the casing 10. The first flow path F1 that connects the inlet 23 and the outlet 33 is formed in the casing 10, and the absorber 40 includes the inlet 23, the outlet 33, and the like. The absorber 40 closes the inlet 23 during reverse flow in which a through-hole 46 through which water passes is formed and water flows from the outlet 33 to the inlet 23. While the first flow path F1 is blocked, water is circulated through the second flow path F2, and during forward flow in which water flows from the inlet 23 to the outlet 33, the absorber 40 is connected to the outlet 33 compared to the reverse flow. Opening of the outlet 33 of a nearby item Maintaining, circulating water through the first flow path F1 and a second flow path F2.

According to this configuration, since the absorber 40 that is pushed by water and moves is disposed in the casing 10, the water that has flowed into the casing 10 collides with the absorber 40 in both the forward flow and the reverse flow. And the impact is weakened. The shock absorber 1 basically absorbs the water shock by the absorber 40.

In addition, at the time of forward flow, the absorber 40 approaches the outflow port 33 but maintains the outflow port 33 in an open state. That is, the first flow path F1 is opened. At the time of forward flow, since water is normally flowing in the fluid system in which the shock absorber 1 is incorporated, it is necessary to ensure the flow rate of water passing through the shock absorber 1. As described above, although the absorber 40 approaches the outflow port 30, the state in which the outflow port 33 is opened is maintained, so that the flow rate from the shock absorber 1 is ensured.

On the other hand, at the time of reverse flow, the inlet 23 serving as the outlet of water is closed by the absorber 40, and the first flow path F1 is blocked. However, since the second flow path F2 through the through hole 46 of the absorber 40 is open, the flow of water through the second flow path F2 is maintained. In other words, in the fluid system in which the shock absorber 1 is incorporated, it is not necessary to consider the flow rate in the reverse flow direction. Therefore, at the time of reverse flow, the effect of reducing the impact on the upstream side of the impact absorber 1 is enhanced by closing the inlet 23 and blocking the first flow path F1. However, if the outflow of water from the shock absorber 1 is completely stopped, all the shocks input to the shock absorber 1 are received by the members such as the absorber 40 and the life of the absorber 40 and the like may be shortened. There is. Therefore, the shock absorber 1 causes the water that has flowed in to flow backward through the through hole 46 of the absorber 40, that is, through the second flow path F2. Thereby, the impact to the absorber 40 etc. can also be relieved. The flow rate at this time is small compared to the case where both the first flow path F1 and the second flow path F2 are open. Therefore, the impact propagating to the upstream side of the impact absorber 1 due to the backflow through the second flow path F2 is also small.

As described above, the shock absorber 1 reduces the shock that propagates through the shock absorber 1 regardless of whether the shock occurs on the upstream side or the downstream side while ensuring a normal flow rate (forward flow time). can do. Viewed another way, whether a device (eg, heat exchanger 91) in a fluid system wants to protect against upstream shock or downstream shock, the shock absorber. 1 can be applied.

Further, the first flow path F1 is formed so as to go around the absorber 40 and connect the inflow port 23 and the outflow port 33.

According to this configuration, the first flow path F1 does not connect the inflow port 23 and the outflow port 33 linearly, but connects with a bent or curved flow path, so that the flow path resistance of the first flow path F1 is low. growing. Thereby, the effect of reducing impact during forward flow can be enhanced.

Furthermore, a first receiving surface 42 that is inclined with respect to the inflow direction of water from the inflow port 23 is formed in a portion of the absorber 40 that faces the inflow port 23 and collides with water that flows in from the inflow port 23. ing.

According to this configuration, the water that flows in along the central axis from the inflow port 23 at the time of forward flow enters the first receiving surface 42 not obliquely but obliquely. Therefore, the absorber 40 does not receive all the impact of water, but can release a part of the impact. Thereby, the impact which the absorber 40 receives is relieved.

Furthermore, the first receiving surface 42 is formed in a concave curved surface.

According to this configuration, since the first receiving surface 42 is bent while being curved, the water colliding with the first receiving surface 42 becomes a flow that gathers while turning toward a deep portion of the concave curved surface. As a result, water easily collides, and the impact of water is further weakened.

Further, a second receiving surface 43 that is inclined with respect to the inflow direction of the fluid from the outlet 33 is formed in a portion of the absorber 40 that faces the outlet 33 and collides with the fluid that flows in from the outlet 33. ing.

According to this configuration, the water that has flowed in along the central axis from the outlet 33 at the time of backflow enters the second receiving surface 43 obliquely rather than perpendicularly. Therefore, the absorber 40 does not receive all the impact of water, but can release a part of the impact. Thereby, the impact which the absorber 40 receives is relieved.

Further, the casing 10 comes into contact with the absorber 40 when it moves in a direction approaching the outlet port 33, and the absorber 40 is prevented from moving so that the absorber 40 maintains the state in which the outlet port 33 is opened. A stopper 36 is provided.

According to this configuration, the state in which the outlet 33 is open at the time of forward flow can always be maintained.

<< Embodiment 2 >>
Next, the shock absorber 201 according to the second embodiment will be described. FIG. 5 is a longitudinal sectional view of the shock absorber 201 according to the second embodiment, and shows a state in which an impact in the forward flow direction is applied. FIG. 6 is a longitudinal sectional view of the shock absorber 201 and shows a state in which an impact in the reverse flow direction is applied. Below, it demonstrates centering on a different part from the shock absorber 1 among the structures of the shock absorber 201, about the structure similar to the shock absorber 1, the same code | symbol is attached | subjected and description is abbreviate | omitted.

The shock absorber 201 includes a casing 210 and an absorber 240.

The casing 210 has a first tube portion 220 and a second tube portion 230. The 1st cylinder part 220 and the 2nd cylinder part 230 are mutually connected. The 1st cylinder part 220 is formed in the bottomed substantially cylindrical shape. Specifically, the first cylindrical portion 220 has a substantially cylindrical peripheral wall 221 having the X axis as an axis, and a substantially disc-shaped bottom wall 222 connected to one end of the peripheral wall 221 in the X axis direction. ing. A substantially circular inflow port 223 is formed through the bottom wall 222. The central axis of the inflow port 223 coincides with the X axis. A bearing 224 that supports the absorber 240 is provided on the bottom wall 222. The bearing 224 is disposed substantially at the center of the inflow port 223 and is connected to the bottom wall 222 via two beams 225. The shaft center of the bearing 224 coincides with the X axis. The two beams 225 extend in the radial direction about the X axis. The two beams 225 are arranged on a substantially straight line. A protrusion 226 is provided on the inner surface of the bottom wall 222 (that is, the inner surface of the casing 210). The protrusion 226 is formed in an annular shape so as to surround the inflow port 223.

The second cylinder part 230 basically has the same configuration as the first cylinder part 220. The 2nd cylinder part 230 is formed in the bottomed substantially cylindrical shape. Specifically, the second cylindrical portion 230 has a substantially cylindrical peripheral wall 231 centered on the X axis, and a substantially disc-shaped bottom wall 232 connected to one end of the peripheral wall 231 in the X axis direction. ing. A substantially circular outlet 233 is formed in the bottom wall 232 so as to penetrate therethrough. The central axis of the outlet 233 coincides with the X axis. A bearing 234 that supports the absorber 240 is provided on the bottom wall 232. The bearing 234 is disposed substantially at the center of the outlet 233 and is connected to the bottom wall 232 via two beams 235. The shaft center of the bearing 234 coincides with the X axis. The two beams 235 extend in the radial direction about the X axis. The two beams 235 are arranged on a substantially straight line. Two stoppers 236 projecting inside the casing 210 are provided on the bottom wall 232. The two stoppers 236 are arranged at positions facing each other across the X axis. Each stopper 236 is provided at a connection portion between each beam 235 and the bottom wall 232.

The absorber 240 has a first receiving part 241, a second receiving part 261, and a shaft 250.

The first receiving portion 241 has a substantially circular outer shape centering on the X axis. The outer diameter of the first receiving portion 241 is smaller than the inner diameter of the peripheral wall 221 and larger than the inner diameter of the inflow port 223. The second receiving portion 261 has a substantially circular outer shape centering on the X axis. The outer diameter of the second receiving portion 261 is smaller than the inner diameter of the peripheral wall 231 and larger than the inner diameter of the outlet 233. The shaft 250 extends through the first receiving portion 241 and the second receiving portion 261 in the X-axis direction. The axis of the shaft 250 coincides with the X axis. That is, the shaft 250 is provided at the center of the first receiving portion 241 and the second receiving portion 261. Both end portions of the shaft 250 are fitted in the bearing 224 and the bearing 234 so as to be slidable in the X-axis direction. Thus, the absorber 240 is arranged in the casing 210 so as to be movable in the X-axis direction in the casing 210.

The peripheral edge portion of the first receiving portion 241 is formed flat. An inner portion of the first receiving portion 241 than the peripheral portion is formed in a curved shape.

Specifically, a first receiving surface 242 on which a fluid flowing in from the inflow port 223 collides is formed in a portion of the first receiving portion 241 that faces the inflow port 223. The first receiving surface 242 is inclined with respect to the X axis. More specifically, the first receiving surface 242 is a concave curved surface that is curved so that the center (that is, the portion through which the X axis passes) is most concave.

A circular concave groove 244 extending in the circumferential direction around the X axis is formed on the surface of the peripheral edge of the first receiving portion 241 facing the inflow port 223. An annular rubber 245 is fitted in the concave groove 244. The rubber 245 comes into contact with the protrusion 226 of the casing 210 when the absorber 240 moves toward the inflow port 223.

The first receiving portion 241 has six first through holes 246 through which fluid passes. One end of the first through hole 246 opens in the first receiving surface 242. The first through hole 246 passes through the first receiving portion 241 substantially parallel to the X axis. The six first through holes 246 are arranged at equal intervals in the circumferential direction around the X axis.

The basic configuration of the second receiving portion 641 is the same as that of the first receiving portion 241. The peripheral edge portion of the second receiving portion 261 is formed flat. An inner portion of the second receiving portion 261 with respect to the peripheral portion is formed in a curved shape.

Specifically, a second receiving surface 262 on which the fluid flowing in from the outlet 233 collides is formed at a portion of the second receiving portion 261 facing the outlet 233. The second receiving surface 262 is inclined with respect to the X axis. More specifically, the second receiving surface 262 is a concave curved surface that is curved so that the center (that is, the portion through which the X axis passes) is most concave.

Note that the surface of the peripheral edge of the second receiving portion 261 facing the outlet 233 comes into contact with the stopper 236 of the casing 210 when the absorber 240 moves toward the outlet 233.

The second receiving portion 261 is formed with six second through holes 266 through which fluid passes. One end of the second through hole 266 opens in the second receiving surface 262. The six second through holes 266 are arranged at equal intervals in the circumferential direction around the X axis. The second through hole 266 passes through the second receiving portion 261 substantially parallel to the X axis.

The absorber 240 is disposed in the casing 210 with the first receiving portion 241 facing the inflow port 223 and the second receiving portion 261 facing the outflow port 233. A first spring 271 is disposed in a compressed state between the first receiving portion 241 and the bottom wall 222, and a second spring 272 is disposed in a compressed state between the second receiving portion 261 and the bottom wall 232. Is done. At this time, the spring constants of the first spring 271 and the second spring 272 are set so that the absorber 240 stops at a position where neither the protrusion 226 nor the stopper 236 comes into contact.

In the state where the absorber 240 is disposed in the casing 210, gaps are formed between the peripheral wall 221 and the first receiving portion 241 and between the peripheral wall 231 and the second receiving portion 261. That is, in the casing 210, the first flow path F201 (the first flow path F201 (which connects the inlet 223 and the outlet 233) through the gap between the peripheral wall 221 and the first receiving portion 241 and the gap between the peripheral wall 231 and the second receiving portion 261. A two-dot chain line in FIG. 5 is formed. In addition, in the casing 210, a second flow path F202 (broken line in FIGS. 5 and 6) connecting the inlet 223 and the outlet 233 via the first through hole 246 and the second through hole 266 of the absorber 240. ) Is formed.

Hereinafter, the operation of the shock absorber 201 will be described.

During forward flow, in the shock absorber 201, water flows into the casing 210 from the inflow port 223, and water flows out of the casing 210 through the outflow port 233. At this time, the absorber 240 is not in contact with the protrusion 226 and the stopper 236. That is, the inflow port 223 and the outflow port 233 have a sufficient opening degree.

In this state, the first flow path F201 is open. That is, water that has flowed into the casing 210 from the inlet 223 substantially in parallel with the X axis travels in the X axis direction and collides with the first receiving surface 242 of the absorber 240. Since the first receiving surface 242 is curved so that the center is recessed, the water colliding with the first receiving surface 242 travels along the first receiving surface 242 toward the center of the first receiving surface 242. The water toward the center collides with the water that has come from the other direction toward the center, and then flows toward the outer peripheral side of the first receiving surface 242. Thereafter, the water flows toward the second receiving surface 262 through the gap between the first receiving portion 241 and the peripheral wall 221 and the gap between the second receiving portion 261 and the peripheral wall 231. Finally, water flows out of the casing 210 through the outlet 233.

In addition, the second flow path F202 is also opened. That is, a part of the water flowing in from the inflow port 223 passes through the absorber 240 from the first receiving surface 242 side to the second receiving surface 262 side through the first through hole 246 and the second through hole 266. To do. In this way, the water that has passed through the absorber 240 also flows out of the casing 210 through the outlet 233.

In addition, the absorber 240 moves toward the outlet 233 when the water collides. The spring constants of the first spring 271 and the second spring 272 are set so that the absorber 240 does not contact the stopper 236 when the water flow rate is within a normal range. Thereby, the sufficient opening degree of the outflow port 233 is ensured in normal time.

Here, when a water hammer occurs on the upstream side of the shock absorber 201, the shock propagates to the shock absorber 201. That is, water can flow into the shock absorber 201 with vigor. However, the impact absorber 201 absorbs the impact of water and reduces the impact that propagates downstream of the impact absorber 201. Specifically, as described above, the water flowing in from the inlet 223 first collides with the first receiving surface 242 of the absorber 240. The absorber 240 moves toward the outlet 233 and compresses and deforms the second spring 272. Thereby, the impact of water is absorbed. Thus, the impact of water is weakened by colliding with the absorber 240 and compressing and deforming the second spring 272. Further, since the first receiving surface 242 is inclined (more specifically, curved) so as to be recessed toward the center, water colliding with the first receiving surface 242 gathers at the center of the first receiving surface 242 and other The impact of water also weakens by colliding with water gathered from the direction of. Thereafter, the water flows through the first flow path F201 bent or curved so as to bypass the absorber 240. The impact of water is also weakened by the channel resistance at this time. Furthermore, a part of the water passes through the first through hole 246 and the second through hole 266 of the absorber 240. The impact of water is also weakened by the flow path resistance of the first through hole 246 and the second through hole 266 at this time.

Thus, the impact of water flowing out of the shock absorber 201 during forward flow is weakened.

In addition, the absorber 240 contacts the stopper 236 depending on the flow rate of water. Since the absorber 240 approaches the outlet 233, the opening degree of the outlet 233 is reduced, but the outlet 233 is not closed. That is, the shock absorber 201 can secure a certain amount of water flow through. When an impact occurs on the upstream side of the impact absorber 201, the direction of water flow is the forward flow direction. Therefore, the impact absorber 201 can secure a certain amount of water flow while absorbing the impact of water. Thereby, the normal water flow of the fluid system in which the shock absorber 201 is incorporated can be maintained.

On the other hand, when a water hammer is generated on the downstream side of the shock absorber 201, water flows into the shock absorber 201 from the outlet 233 vigorously (that is, reverse flow). However, the impact absorber 201 absorbs the impact of water and reduces the impact that propagates upstream of the impact absorber 201.

Specifically, at the time of backflow, in the shock absorber 201, water flows into the casing 210 from the outlet 233. The water flowing in from the outlet 233 first collides with the second receiving surface 262 of the absorber 240. The absorber 240 moves toward the inflow port 223 and compresses and deforms the first spring 271. Thereby, the impact of water is absorbed. Thus, the impact of water is weakened by colliding with the absorber 240 and compressing and deforming the first spring 271. Further, since the second receiving surface 262 is inclined (more specifically, curved) so as to be recessed toward the center, the water colliding with the second receiving surface 262 gathers at the center of the second receiving surface 262, and the like. The impact of water also weakens by colliding with water gathered from the direction of.

Furthermore, the absorber 240 contacts the protrusion 226 depending on the flow rate of water. That is, the absorber 240 closes the inflow port 223. As a result, the first flow path F201 is blocked. However, the opening of the second flow path F202 is maintained. The water that flows in from the outlet 233 passes through the absorber 240 from the second receiving surface 262 side to the first receiving surface 242 side through the second through hole 266 and the first through hole 246. The water that has passed through the absorber 240 flows out of the casing 210 through the inflow port 223. The impact of water is also weakened by the flow path resistance when passing through the second through hole 266 and the first through hole 246. In other words, only water that has passed through the second through hole 266 and the first through hole 246 and whose impact has weakened flows out from the shock absorber 201 to the upstream side.

In addition, when the flow rate of the backflow water is relatively small, the absorber 240 may not move to the protruding portion 226 even if the first spring 271 is compressed and deformed. At this time, the inlet 223 is not closed. In that case, the water colliding with the second receiving surface 262 flows through the first flow path F201 bent so as to bypass the absorber 240. The impact of water is also weakened by the channel resistance at this time.

Thus, the impact of water flowing out of the shock absorber 201 during backflow is weakened.

Thus, the shock absorber 201 can relieve the impact from both the upstream side and the downstream side, and reduce the impact of the flowing water. In addition, at the time of forward flow, the open state of the first flow path F201 is maintained without closing the inflow port 223 and the outflow port 233, so that the flow rate through the shock absorber 201 can be ensured. That is, it is possible to ensure a normal flow rate in which no water hammer or the like is generated.

As described above, the shock absorber 201 is disposed in the casing 210 having the inlet 223 into which water (fluid) flows in and the outlet 233 from which water flows out, and pushes against the water flowing in the casing 210. The first flow path F201 that connects the inlet 223 and the outlet 233 is formed in the casing 210, and the absorber 240 includes the inlet 223 and the outlet 233. The first through-hole 246 and the second through-hole 266 through which water passes are formed to form a part of the second flow path F202 that connects the two, and the absorber 240 during reverse flow in which water flows from the outlet 233 to the inlet 223. Is closed during the forward flow in which water flows from the inlet 223 to the outlet 233 while the inlet 223 is closed and the first flow path F201 is shut off while the water flows through the second flow path F202. 240 remain the outlet 233 open to what is located at a position closer to the outflow port 233 than that in the reverse flow, circulating water through the first flow path F201 and second flow path F 202.

According to this configuration, similarly to the shock absorber 1, the shock absorber 201 passes through the shock absorber 201 regardless of whether the shock occurs on the upstream side or the downstream side while ensuring a normal flow rate. The impact that propagates can be reduced.

Further, the second receiving surface 262 is formed in a concave curved surface.

According to this configuration, since the second receiving surface 262 is concave while being curved, the water colliding with the second receiving surface 262 at the time of backflow becomes a flow that gathers while turning toward a deep portion of the concave curved surface. As a result, water easily collides, and the impact of water is further weakened.

<< Other Embodiments >>
As described above, the embodiment has been described as an example of the technique disclosed in the present application. However, the technology in the present disclosure is not limited to this, and can also be applied to an embodiment in which changes, replacements, additions, omissions, and the like are appropriately performed. Moreover, it is also possible to combine each component demonstrated by the said embodiment and it can also be set as a new embodiment. In addition, among the components described in the attached drawings and detailed description, not only the components essential for solving the problem, but also the components not essential for solving the problem in order to illustrate the technology. May also be included. Therefore, it should not be immediately recognized that these non-essential components are essential as those non-essential components are described in the accompanying drawings and detailed description.

For example, the fluid flowing through the

shock absorbers

1, 201 may be a fluid other than water.

The 1st flow path F1 and the 2nd flow path F2 which are formed in the casing 10 can be formed in arbitrary shapes. Similarly, the 1st flow path F210 and the 2nd flow path F202 which are formed in the casing 210 can also be formed in arbitrary shapes.

The shape of the

absorbers

40 and 240 can be any shape. The

absorbers

40 and 240 should just be arrange | positioned in the position where the fluid which distribute | circulates the

casings

10 and 210 collides. For example, the receiving part 41 may be formed in a flat plate shape. Further, the receiving portion 41 may be a block-like member instead of a plate-like shape.

The shock absorber 1 may have the first spring 271 and / or the second spring 272 in the shock absorber 201. That is, the absorber 40 may be elastically supported in the casing 10.

The shock absorber 201 may have only one of the first spring 271 and the second spring 272. That is, when both ends of the spring are attached to the casing 210 and the absorber 240, the number of springs that support the absorber 240 may be one. Further, the shock absorber 201 may not have the first spring 271 and the second spring 272. In that case, the absorber 240 is movably disposed in the casing 210 like the absorber 40 of the shock absorber 1.

In the shock absorber 201, the stopper 236 may not be provided. That is, even when an impact in the forward flow direction occurs, it is sufficient that the second spring 272 has a spring constant that is large enough that the absorber 240 does not close the outlet 233.

As described above, the technology disclosed herein is useful for shock absorbers.

1,201

Shock absorber

10, 210

Casing

23, 223

Inlet

33, 233

Outlet

36, 236

Stopper

40, 240

Absorber

42, 242

First receiving surface

43, 262 Second receiving surface 46 Through hole 246 First through Hole 266 Second through hole F1, F201 First flow path F2, F202 Second flow path

Claims

A casing having an inlet through which fluid flows in and an outlet through which fluid flows out;
An absorber disposed in the casing and moved by being pushed by a fluid flowing in the casing;
A first flow path connecting the inlet and the outlet is formed in the casing,
The absorber constitutes a part of a second flow path that connects the inlet and the outlet, and a through-hole through which a fluid passes is formed.
At the time of reverse flow in which fluid flows from the outlet to the inlet, the absorber closes the inlet and blocks the first flow path, while allowing the fluid to flow through the second flow path,
During forward flow in which fluid flows from the inflow port to the outflow port, the absorber is positioned closer to the outflow port than in the reverse flow, but maintains the open state of the outflow port, and the first flow path And an impact absorber that allows fluid to flow through the second flow path.
The shock absorber according to claim 1,
The first flow path is an impact absorber formed so as to go around the absorber and connect the inflow port and the outflow port.
The shock absorber according to claim 2,
An impact is formed in a portion of the absorber opposite to the inlet and where a fluid flowing in from the inlet collides is inclined with respect to the inflow direction of the fluid from the inlet. Absorber.
The shock absorber according to claim 3,
The first absorber is an impact absorber formed in a concave curved surface.
The shock absorber according to any one of claims 1 to 4,
A second receiving surface that is inclined with respect to the inflow direction of the fluid from the outflow port is formed in a portion of the absorber that faces the outflow port and collides with the fluid that flows in from the outflow port during reverse flow. Shock absorber.
The shock absorber according to claim 5,
The second absorber is an impact absorber formed in a concave curved surface.
The shock absorber according to any one of claims 1 to 6,
The casing has a stopper that prevents movement of the absorber so that the absorber maintains contact with the absorber when the absorber moves in a direction approaching the outlet, and maintains the state where the absorber opens the outlet. Shock absorber provided.