JP4355196B2 - Bellows valve - Google Patents

Description

  The present invention relates to a bellows valve in which a valve shaft portion is covered with a bellows portion.

  In general, a bellows valve in which a valve shaft portion is covered with a bellows-like metal bellows is used in a process after the sterilization process in the liquid food manufacturing process in order to prevent secondary bacterial contamination of the product.

  Alternatively, as the bellows valve, an aseptic valve formed so that the outside air can be completely shut off by the bellows during the opening / closing operation and the inside of the bellows and the periphery of the valve shaft portion can be put in a sterile state.

  The metal bellows has a bellows-like portion that expands and contracts in accordance with the opening and closing of the valve, and has a life that can withstand opening and closing operations of 1 million times within the range of normal allowable working pressure.

  However, the water hammer phenomenon in which a strong water hammer wave is generated due to the abnormal pressure generated when the flow velocity of the liquid flowing in the flow path (line) suddenly changes due to gas mixing or sudden opening / closing of the valve. May occur.

When the metal bellows is subjected to a sudden compression action due to water hammer wave or the like of several times to 10 times the normal pressure due to the occurrence of the water hammer phenomenon, the whole or a part of the metal bellows is deformed, and the original function is It may decrease, and cracking may occur due to metal fatigue at the deformation site in a short period of time.
When such a situation occurs, the function of the bellows valve itself is lost, which hinders control of the flowing liquid.

  In the liquid food manufacturing process, it is ideal to configure and control the water hammer so that the water hammer phenomenon does not occur. Because various elements such as opening and closing are combined, it is difficult to completely remove them.

  For this reason, there is a demand for a bellows valve that improves resistance to impact generated by the water hammer phenomenon even when the water hammer phenomenon occurs.

  Conventionally, a bellows valve (for example, refer to Patent Document 1) in which a plurality of bellows is provided as an inner and outer arrangement is known, but the inner bellows is formed of an elastic material such as rubber or a resin material. The bellows valve is not found.

Japanese Utility Model Publication No. 5-40378

  SUMMARY OF THE INVENTION An object of the present invention is to provide a novel bellows valve that has improved impact pressure resistance even under the occurrence of a water hammer, and has improved reliability and extended life.

In order to achieve the above object, a bellows valve according to the first aspect of the present invention is a bellows valve provided with a bellows portion covering a portion inserted into a valve box portion of a valve shaft portion, wherein the bellows portion is The bellows part is formed by an outer side bellows that receives the hydraulic pressure in the valve box part and an inner side bellows provided inside the outer side bellows, and the bellows part includes the outer side bellows and the inner side bellows. A discharge portion that can discharge the intruding liquid that has entered between the side bellows and the outside of the valve box portion, and there is a liquid between the valve shaft portion insertion portion of the valve shaft portion and the inner side bellows. sealing portion which can be accommodated and sealed is formed a container portion for receiving the fluid flowing from the closed portion upon contraction of the bellows portion with the fluid in the closed portion is sealed is provided continuously to the bellows part, the The valve box is the liquid inlet and A lid is fixed to an upper portion of a valve housing body having a mouth, and the container portion includes a cylindrical valve base centered on a valve shaft portion provided on an upper surface of the lid portion, and the valve It is formed by the piston-like part which moves up and down within the base part .

  The invention according to claim 2 is characterized in that the sealing part and the container part communicate with each other through an orifice.

  The outer side bellows is made of metal, and the inner side bellows is formed of an elastic material such as rubber or a resin material.

  Further, the inner side bellows is formed to have a thickness dimension capable of being in pressure contact with the opposing side surface portion of each bellows portion formed when the outer side bellows and the inner side bellows contract. And

In the invention according to claim 1, since the fluid is sealed in the sealed portion formed between the outer side bellows and the inner side bellows, a water hammer phenomenon occurs in the pipe line, Even when a large water hammer wave occurs, the fluid sealed in the sealed part functions as a rigid body and supports the outer bellows from the inside, effectively damaging or deforming the outer bellows. Can be prevented.
Further, in the invention according to claim 2, when the sealing part and the container part communicate with each other through an orifice, the water hammer phenomenon occurs and a large water hammer wave is generated. In this case, the pressure energy generated by the water hammer wave is absorbed by the sealed fluid in the sealed part flowing into the container part through the orifice.
As a result, it is possible to effectively prevent the outer side bellows from being damaged.
In the invention according to claim 3, since the inner bellows is formed of an elastic material such as rubber or a resin material, the pressure energy due to the water hammer wave can be effectively absorbed. Moreover, since the outer side bellows is metal, it is excellent in impact resistance.
Furthermore, in the invention according to claim 4, when the valve is in an open state and the outer side bellows and the inner side bellows contract, each bellows portion of the inner side bellows is the bellows of the outer side bellows. Since the outer side bellows is in contact with the inner surface of the part and supports the outer side bellows from the inside, even if a water hammer phenomenon occurs and a large water hammer wave is generated, the contracted inner side bellows is the outer side bellows. By supporting from the inside, the outer side bellows can be effectively protected against the water hammer wave.

  1 and 2 show an embodiment of a bellows valve according to the present invention. FIG. 1 is a cross-sectional view showing a state in which the bellows portion is extended, and FIG. 2 is a state in which the bellows portion is contracted. FIG.

  A bellows valve 40 according to the present embodiment is a bellows valve provided with a bellows portion 4 that covers a portion portion 3 inserted into the valve box portion 2 of the valve shaft portion 1, and the bellows portion 4 is a valve box. The outer side bellows 5 that receives the hydraulic pressure in the portion 2 and the inner side bellows 6 provided inside the outer side bellows 5 are formed.

  The bellows portion 4 has a discharge portion 7 that can discharge the liquid in the flow path that has entered between the outer side bellows 6 and the inner side bellows 5 to the outside of the valve box portion 2.

  Further, a sealing portion 9 is formed between the inner bellows 5 and the insertion portion 3 so that the fluid 8 can be sealed and stored. The fluid 8 is enclosed in the sealing portion 9 and the bellows portion is sealed. 4, a container portion 10 that receives the fluid 8 that flows out from the inside of the sealing portion 9 when contracted is connected to the sealing portion 9 via an orifice 11. As the fluid 8, oil, water or the like is effective.

  The outer bellows 5 is made of metal, and the inner bellows 6 is made of rubber. In the present embodiment, the inner bellows 6 is made of rubber. However, the inner bellows 6 is not limited to this embodiment, and may be made of other water-resistant synthetic resin.

  The inner bellows 6 has a thickness capable of being pressed against the opposing side surface portions 14 and 15 of the bellows portions 12 and 13 formed when the outer bellows 5 and the inner bellows 6 are contracted. Dimension is formed.

  The valve box portion 2 is formed by fixing a lid portion 20 to a valve housing main body 19 having a liquid inlet 17 and an outlet 18 on a lower surface and a side surface by a clamp 21.

  The valve shaft portion 1 has a valve body 24 with a seal 41 fixed to a lower end of an insertion portion 3 inserted into the valve box portion 2 through a through hole 22 formed in the lid portion 20 via a screw portion 25. Has been.

  The outer side bellows 5 and the inner side bellows 6 are provided with upper flange portions 27, 28 continuously provided at the upper ends of the outer side bellows 5 and the inner side bellows 6, and the upper flange portions 27, 28. Are clamped when the valve housing body 19 and the lid 20 are fixed by the clamp 21. Further, the lower end 29 of the outer side bellows 5 is fixed to the valve body 24, and the lower end of the inner side bellows 6 is provided with a lower flange portion 30 connected to the lower end of the inner side bellows 6. It is clamped when the valve body 24 is screwed to the lower end of the insertion portion 3.

  The discharge portion 7 is formed by providing a guide hole 32 and a detection hole 33 in the upper flange 27 and the lid portion 20 of the outer bellows 6.

  The container portion 10 is formed by a cylindrical valve base portion 34 centered on the valve shaft portion 1 provided on the upper surface of the lid portion 20 and a piston-like portion 35 that moves up and down in the valve base portion 34. Yes. The piston-like portion 35 is in a state in which the upper limit of the vertical movement is determined by the stop ring 36 with respect to the valve shaft portion 1 and the valve base portion 34, and the inner side O-ring 37 and the outer side. The O-ring 38 is disposed and held in a sealed state in the valve base 34.

  The orifice 11 is formed by the distance between the peripheral surface of the through hole 22 and the outer peripheral surface of the valve shaft portion 1. The orifice 11 can be implemented by providing an orifice hole 42 in the lid portion 20 as shown in FIG.

  Further, the inner bellows 6 is provided with a groove slit 39 for guiding an intrusion liquid on a surface facing the outer bellows 4. The guide groove slit 39 is for facilitating the intrusion liquid to flow into the guide hole 32.

  Note that the present invention can be practiced without providing the intruding liquid guide groove 39.

  In the bellows valve 40 according to the present embodiment, when an abnormal impact pressure is generated by a water hammer wave in msec due to a water hammer phenomenon or the like, and the pressure acts on the outer side bellows 5. Since the fluid 8 sealed in the sealing portion 9 functions as a rigid body, the fluid 8 supports the outer bellows 5 from the inside, and prevents the outer bellows 5 from being damaged or deformed.

  When the bellows portion 4 is in a contracted state as shown in FIG. 2, the outer bellows 5 is sandwiched between the bellows portion 13 of the inner bellows 6 and the bellows portion 12 of the outer bellows 5. It enters the state (see the phantom line in FIG. 2), and the inner bellows 6 is supported from the inner side to prevent the outer side bellows from being damaged or deformed.

  Furthermore, since the sealing part 9 and the container part 10 are communicated with each other through the orifice 11, the fluid 8 sealed in the sealing part 9 passes through the orifice 11 between the sealing part 9 and the container part 10. And flow out of the valve box part 2 to relieve abnormal impact pressure due to the water hammer phenomenon.

  Further, when the bellows part 3 is in the straightened state as shown in FIG. 1, when the outer bellows 5 part, for example, one or two bellows parts 12 are locally subjected to the abnormal impact pressure, The local portion is reinforced in a state where the bellows portion 13 of the inner bellows 6 is sandwiched between the bellows portions 12 in the local portion of the outer bellows 5.

It is sectional drawing in case the bellows part which shows 1st embodiment is an extension state.

It is sectional drawing in the case of being the expansion-contraction state of a bellows part.

DESCRIPTION OF SYMBOLS 1 Valve shaft part 2 Valve box part 3 Insertion part 4 Bellows part 5 Outer side bellows 6 Inner side bellows 7 Discharge part 8 Liquid 9 Sealing part 10 Container part 11 Orifice 12 Bellows part 13 Bellows part 14 Side part 15 Side part 17 Inlet 18 Outlet 19 Valve housing body 20 Lid part 21 Clamp 22 Through hole 24 Valve body 25 Screw part 27 Upper flange part 28 Upper flange part 29 Lower end 30 Lower flange part 32 Conducting hole 33 Detection hole 34 Valve base 35 Piston shape Part 36 retaining ring 37O ring 38O ring 39 groove groove for guiding 40 bellows valve 41 seal according to the embodiment

Claims (4)

A bellows valve that includes a bellows portion that covers a portion inserted into the valve box portion of the valve shaft portion, is disposed in the liquid passage, and controls the flow of the liquid,
The bellows part is formed by an outer side bellows that receives the hydraulic pressure in the valve box part and an inner side bellows that is disposed inside the outer side bellows and surrounds the valve shaft,
The bellows part has a discharge part capable of discharging the intruding liquid that has entered between the outer side bellows and the inner side bellows to the outside of the valve box part,
The inner bellows is formed with a sealed portion capable of sealing and storing a liquid, and a fluid is sealed in the sealed portion, and a container portion that receives a fluid that flows out from the sealed portion when the bellows portion contracts. Is connected to the bellows part,
The valve box part is formed by fixing a lid part to the upper part of a valve housing body having a liquid inlet and outlet, and the container part is centered on a valve shaft part provided on the upper surface of the lid part. A bellows valve characterized by comprising a cylindrical valve base and a piston-like part that moves up and down in the valve base .   2. The bellows valve according to claim 1, wherein the sealing part and the container part communicate with each other through an orifice.   3. The bellows valve according to claim 1, wherein the outer side bellows is made of metal, and the inner side bellows is formed of an elastic material such as rubber or a resin material.   The inner side bellows is formed to have a thickness dimension capable of being in pressure contact with opposite side portions of each bellows portion formed when the outer side bellows and the inner side bellows contract. The bellows valve according to claim 3.

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