Pressure reduction valve

Abstract

To provide a pressure reduction valve that can prevent deterioration.SOLUTION: The pressure reduction valve comprises a piston and a spring connected to the piston, and a weighted damper is attached to the piston.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present disclosure relates to a pressure reducing valve.

Background Art

[0002] Patent Document 1 discloses a pressure reducing valve capable of preventing the occurrence of piston vibration, and provides a structure for suppressing the play between the piston and the spring at the grounding portions of the piston and the spring.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the prior art, the movement of sliding parts such as a piston during the driving of a pressure reducing valve may excite the resonance of a spring, and the spring may vibrate at a higher vibration than normal due to the spring resonance, accelerating the deterioration.

[0005] The present disclosure has been made in view of these circumstances, and provides a pressure reducing valve capable of suppressing deterioration.

Means for Solving the Problems

[0006] The present application discloses a pressure reducing valve including a piston and a spring connected to the piston, wherein a damper having a weight is attached to the piston.

Effects of the Invention

[0007] According to the present disclosure, by providing a damper, it is possible to suppress the resonance of the spring and suppress the occurrence of spring deterioration and breakage, resulting in a pressure reducing valve.

Brief Description of the Drawings

[0008]

Figure 1

Figure 2

[0009] 1. Embodiment 1 FIG. 1 conceptually shows the pressure reducing valve 10 according to Embodiment 1 of the present disclosure. The basic structure of the pressure reducing valve 10 is the same as that of a known pressure reducing valve. That is, the pressure reducing valve 10 of the present embodiment includes a first chamber 11 to which a high-pressure side pipe 10a is connected, and a second chamber 21 to which a low-pressure side pipe 10b and an atmospheric pressure pipe 10c are connected. The first chamber 11 and the second chamber 21 are connected by a connecting portion 15.

[0010] In the first chamber 11, a poppet 12 is disposed so as to be movable forward and backward toward the connecting portion 15, and is biased toward the connecting portion 15. Here, an annular sealing material 13 is disposed at the boundary between the first chamber 11 and the connecting portion 15. When the tip of the poppet 12 enters the inside of the sealing material 13, the outer periphery of the poppet 12 comes into contact with the inner surface of the sealing material 13, and the first chamber 11 and the connecting portion 15 (second chamber 21) are blocked. On the other hand, when the poppet 12 retracts, a gap is formed between the outer periphery of the poppet 12 and the inner surface of the sealing material 13, and the first chamber 11 and the connecting portion 15 (second chamber 21) communicate with each other.

[0011] A piston 16 is disposed at the tip of the poppet 12 on the connecting portion 15 side, and extends through the connecting portion 15 to the inside of the second chamber 21. The piston 16 has a sealing material 17 and an O-ring 18 wound around its outer periphery at a portion disposed inside the second chamber 21. When this contacts the inner surface of the second chamber 21, the second chamber 21 is divided into two airtight portions. The low-pressure side pipe 10b communicates with the space on the connecting portion 15 side (first chamber 11 side) of the divided portions, and the atmospheric pressure pipe 10c communicates with the space on the side opposite to the connecting portion 15 side (first chamber 11 side) of the divided portions.

[0012] Also, in the second chamber 21, a spring 22 is disposed in the space on the side where the atmospheric pressure pipe 10c communicates. One end of the spring 22 is in contact with the piston 16, and the other end is in contact with the inner surface of the second chamber 21. The biasing direction of the spring 22 is the direction toward the communication portion 15 (the first chamber 11). The biasing force of the spring 22 can be changed by an adjustment member (not shown) as is well known, and is configured so that a necessary pressure reduction process can be performed.

[0013] Furthermore, in this embodiment, a damper 25 is disposed on the surface of the piston 16 on the same space side as the spring 22. The damper 25 has a metal column 26 extending in the biasing direction of the spring 22. An annular rubber 27 is disposed on a part of the outer periphery of the metal column 26, and a metal weight 28 is disposed on the outer periphery of the rubber 27.

[0014] Such a pressure reducing valve 10 operates as follows, for example. First, it is a pressure reducing action as is well known. Specifically, it is as follows. When the high-pressure fluid from the high-pressure side pipe 10a enters the first chamber 11, it presses the poppet 12 in the direction in which the poppet 12 contacts the sealing material 13 (the direction of closing the connecting portion 15). On the other hand, the poppet 12 is pressed by a force from the spring 22 via the piston 16 against the force of the high-pressure fluid. Thus, the position of the poppet 12 is determined by the difference between the force by which the poppet 12 is pushed by the high-pressure fluid and the force by which it is pushed by the biasing force of the spring 22. This position is adjusted so that a gap between the poppet 12 and the sealing material 13 is obtained to achieve a desired pressure (pressure reduction state) in the second chamber 21. Thereby, the high-pressure fluid in the first chamber 11 is depressurized through the gap between the poppet 12 and the sealing material 13 and flows into the second chamber 21 and out through the low-pressure side pipe 10b.

[0015] Second, it is the effect of suppressing vibration by the damper 25. As described above, in the pressure reducing valve, the gas flow path is adjusted and the pressure is adjusted by the balance between the biasing force of the spring and the pressure of the fluid on the high-pressure side. The fluid does not always have a constant flow rate or pressure, and there are periodic and aperiodic increases and decreases, as well as the occurrence of turbulent flow. Therefore, the up-and-down movement of the piston accompanying such increases and decreases or turbulent flow may occur, and the resonance of the spring may be excited. When the resonance of the spring occurs, the spring expands and contracts at a higher vibration frequency than during normal use, so its deterioration is accelerated, which may eventually lead to the breakage of the spring. On the other hand, by providing the damper - 25, the resonance of the spring 22 can be suppressed, and the occurrence of deterioration and breakage of the spring 22 can be suppressed. The damper - 25 of this embodiment has a weight 28 attached to a metal rod 26 via a rubber 27, and acts as a so-called dynamic vibration absorber (mass damper) to attenuate vibration and suppress the above-mentioned resonance.

[0016] 2. Embodiment 2 FIG. 2 conceptually shows a pressure reducing valve 30 according to Embodiment 2 of the present disclosure. The pressure reducing valve 30 is different in that a damper 35 is applied instead of the damper - 25 of the pressure reducing valve 10 described above. Since the other parts are the same as those of the pressure reducing valve 10, the same reference numerals are given and the description is omitted.

[0017] The damper 35 is arranged such that a tubular member 36 having an axis in the biasing direction of the spring 22 stands on the surface of the piston 16 on the side of the space where the spring 22 is arranged. On the other hand, a metal rod 37 is arranged to extend from the inner surface of the space in the second chamber 21 where the spring 22 is arranged, and the tip of the metal rod 37 extends so as to enter the inside of the annular member 36. A rubber 38 is wound around the outer periphery of the metal rod 37, and the outer peripheral surface of the rubber 38 is in contact with the inner surface of the tubular member 36.

[0018] Such a pressure reducing valve 30 has a pressure reducing action as is well known as shown first when explaining the pressure reducing valve 10 above. Also, according to the damper 35, when the tubular member 36 follows the vibration of the piston 16 and moves in the axial direction of the tube, friction is generated between the inner surface of the tube and the surface of the rubber 38 so as to resist this movement. Thereby, the vibration is attenuated, the resonance of the spring 22 is suppressed, and the occurrence of deterioration and breakage of the spring 22 can be suppressed.

Description of Symbols

[0019] 10, 30... pressure reducing valves, 11... first chamber, 12... poppet, 13... sealing material, 16... piston, 17... sealing material, 18... O-ring, 21... second chamber, 22... spring, 25... damper, 26... metal column, 27... rubber, 28... weight, 35... damper, 36... tubular member, 37... metal rod, 38... rubber

Claims

【Claim 1】 A piston, a spring connected to the piston, and a damper having a weight is attached to the piston, a pressure reducing valve.

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