JP2005155676A - Bellows valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bellows valve having improved impact pressure resistance under the condition of water hammer and achieving higher reliability and longer life. <P>SOLUTION: The bellows valve provided on the way of a liquid path for controlling the flow of liquid comprises a bellows part 3 for covering a portion of a valve shaft part 2 entering into a valve box part 1. The bellows part 3 consists of an outward bellows 4 for receiving liquid pressure in the valve box part 1 and an inward bellows 5 provided inward on the outward bellows 4. The outward bellows 4 is formed of a metal material and the inward bellows 5 is formed of an elastic material such as a rubber or a resin material. <P>COPYRIGHT: (C)2005,JPO&NCIPI

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 about one 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. Wake up.

  When the metal bellows is subjected to a sudden compression action due to water hammer wave or the like 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 reduced. There was a problem that the crack was generated due to the metal fatigue of the deformed portion in a short time.

  In the liquid food manufacturing process, it is ideal to configure and control the line so that the water hammer phenomenon does not occur. Since 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 has improved resistance to an impact caused by the water hammer phenomenon even when the water hammer phenomenon occurs.

  Conventionally, a bellows valve having a structure in which a plurality of bellows are arranged to prevent leakage of a working fluid to the outside (see, for example, Patent Document 1) is known, but has a structure and an effect of the present invention. There is no total bellows valve.

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 present invention includes a bellows portion that covers a portion of a valve shaft portion that enters a valve box portion, and is provided in the middle of a liquid path to control the flow of 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 provided inside the outer side bellows, and the outer side bellows is a metal The inner bellows is made of an elastic material such as rubber or resin material.

  The bellows part is a discharge that can drain the liquid in the liquid passage that has entered between the outer bellows and the inner bellows to the outside of the valve box part when the outer bellows is damaged. It has the part.

  The discharge part is characterized in that a hole is formed in the inner bellows so that liquid that has entered through the hole can be discharged.

  The discharge part is formed so that a hole is formed in the wall of the valve box part and the intrusion liquid can be discharged through the hole.

  The discharge part includes a groove part formed outside the inner bellows, and a hole part capable of discharging the liquid in the liquid passage that has entered between the outer bellows and the inner bellows to the outside of the valve box part. It is characterized by having.

  In the invention according to claim 1, when an abnormal impact pressure due to a water hammer or the like is applied to the bellows part, the inner bellows absorbs a large abnormal impact pressure acting on the outer bellows. It is possible to effectively prevent the outer side bellows from being deformed or damaged.

  In addition, it is difficult to cause breakage due to functional degradation caused by deformation of the whole or a partial portion, functional degradation caused by deformation fatigue, or deformation fatigue caused by deformation fatigue, and the above-mentioned breakage is effective for deformation. Therefore, the impact pressure resistance is improved and the service life of the valve can be improved.

  In the invention according to claim 2, the impact pressure can be absorbed more efficiently, the impact pressure resistance can be further improved, and the service life of the valve can be further improved.

  In the invention according to claim 3, when the outer side bellows is broken, the liquid in the liquid passage which has flowed in from the broken portion is quickly discharged to the outside of the valve through the discharge portion. Therefore, the abnormal part can be easily found by visual confirmation at the time of inspection.

  In the invention according to claim 4, since it is configured to discharge the liquid that has entered through the groove provided in the inner bellows, an abnormal situation due to visual confirmation during the above inspection Can be easily discovered.

  Further, in the invention according to claim 5, since the liquid that has entered through the hole formed in the wall portion of the valve box portion is configured to be discharged outside the bellows valve, it enters the valve. The discharged liquid can be discharged more quickly.

  First, the bellows valve according to the first embodiment will be described with reference to FIGS. 1 and 2.

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

  The bellows valve 27 according to the first embodiment is a bellows valve provided with a bellows portion 3 that covers a portion of the valve shaft portion 2 that enters the valve box portion 1, and the bellows portion 3 is a valve The outer side bellows 4 that receives the hydraulic pressure in the box portion 1 and the inner side bellows 5 provided inside the outer side bellows 4 are formed.

  The outer side bellows 4 is made of metal, and the inner side bellows 5 is made of rubber.

  The inner side bellows 5 has a thickness dimension capable of being pressed against the opposing side surface parts 8 and 9 of the bellows parts 6 and 7 formed when the outer side bellows 4 and the inner side bellows 5 contract. Formed

  The bellows portion 3 has a discharge portion 10 that can discharge the intruding liquid that has entered between the outer bellows 4 and the inner bellows 5 when the outer bellows is broken. doing.

  The discharge part 10 is formed so that a plurality of holes 11 are formed in the inner bellows 5 and the intrusion liquid can be discharged through the holes 11.

  The valve box portion 1 is formed by fixing a lid portion 16 with a clamp 17 to a valve housing body 15 having a fluid inlet 13 and an outlet 14 on a lower surface and a side surface.

  The valve shaft portion 2 has a valve body 20 with a seal 34 fixed to a lower end of a shaft rod 19 inserted into the valve box portion 1 through a through hole 18 formed in the lid portion 16 via a screw portion 21. Has been.

  The outer side bellows 4 and the inner side bellows 5 are continuously provided with upper flange portions 22 and 23 at the upper ends of the outer side bellows 4 and the inner side bellows 5, and the upper flange portions 22 and 23. Is clamped when the valve housing body 15 and the lid portion 16 are fixed by the clamp 17. The lower end 24 of the outer side bellows 4 is fixed to the valve body, and the lower end of the inner side bellows 5 is the lower flange portion 25 connected to the lower end of the inner side bellows 5. It is clamped when the valve body 20 is screwed to the lower end of the shaft rod 19.

  Next, the bellows valve according to the second embodiment will be described with reference to FIGS.

  3 and 4 show a second embodiment of the bellows valve according to the present invention. FIG. 3 is a cross-sectional view showing a state in which the bellows portion is extended. FIG. It is sectional drawing which shows the state which exists.

  Since the configuration of the bellows valve 30 according to the second embodiment is substantially the same as that of the bellows valve 27 according to the first embodiment, the same reference numerals are given to the same portions, and the detailed description thereof is provided. Are omitted, and different parts will be described next.

  That is, the bellows valve 30 according to the second embodiment does not include the hole 11 in the first embodiment, and instead, on the surface facing the outer side bellows 4 in the inner side bellows 5. A groove slit 31 for guiding the intrusion liquid is provided, and a guide hole 32 and a detection hole 33 are provided in the upper flange 22 and the lid portion 16 of the outer side bellows 4, so that the discharge portion 10 is formed.

  The guide groove 39 is for guiding the intrusion liquid to easily flow into the guide hole 32.

In the first and second embodiments, when an abnormal impact pressure due to a water hammer phenomenon or the like is generated and the impact pressure acts on the outer side bellows 4, the inner side bellows 3 is moved to the outer side. Since the bellows are supported, the impact of the outer side bellows is buffered.
In the first embodiment, when the intruding liquid flows between the outer side bellows 4 and the inner side bellows 5, the intruding liquid passes through the hole 11 and is After passing through a space 26 formed between the inner bellows 5 and the shaft rod 19, it is discharged outside through a through hole 18 formed in the lid portion 16.

  In the second embodiment, when the intruding liquid flows between the outer side bellows 4 and the inner side bellows 5, the guiding groove slit 32 and the detection hole 33 are used. Discharged outside.

  In the first and second embodiments, abnormal impact pressure due to a water hammer phenomenon or the like is buffered by the inner bellows 3 when acting on the outer bellows 4.

  Further, when the bellows portion 3 is contracted as shown in FIGS. 2 and 4, the outer bellows 4 is the bellows portion 9 of the inner bellows 5 and the bellows portion of the outer bellows 4. 8 is reinforced in a state of being sandwiched between 8 (see phantom lines in FIGS. 1 and 3).

  Further, when the bellows part 3 is in the extended state as shown in FIGS. 1 and 3, the part of the outer bellows 4, for example, one or two bellows parts 8 locally applies the abnormal impact pressure. When received, the local portion is reinforced in a state where the bellows portion 9 of the inner bellows 5 is sandwiched between the local bellows portion 8 of the outer bellows 4.

It is sectional drawing in case the bellows part which shows 1st embodiment is extended.

Similarly, it is sectional drawing in case the bellows part is shrinking.

It is sectional drawing in case the bellows part which shows 2nd embodiment is extended.

It is sectional drawing in the case of showing 2nd embodiment and the bellows part shrink | contracting.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Valve box part 2 Valve shaft part 3 Bellows part 4 Outer side bellows 5 Inner side bellows 6 Bellows part 7 Bellows part 8 Opposite side part 9 Opposite side part 10 Discharge part 11 Hole part 13 Inlet 14 Outlet 15 Valve housing Main body 16 Lid 17 Clamp 18 Through hole 19 Shaft rod 20 Valve body 21 Screw part 22 Upper flange part 23 Upper flange part 24 Lower end 25 Lower flange part 26 Space 27 Bellows valve 30 of the first embodiment Second embodiment Bellows valve 31 guide groove 32 guide hole 33 detection hole

Claims (5)

  A bellows valve that includes a bellows part that covers a portion of the valve shaft part that is inserted into the valve box part, and that is provided in the middle of the liquid path to control the flow of liquid, wherein the bellows part controls the fluid pressure in the valve box part. The outer side bellows is made of metal and the inner side bellows is elastic such as rubber and resin material. A bellows valve characterized by being made of a 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 1.   The bellows part is a discharge that can drain the liquid in the liquid passage that has entered between the outer bellows and the inner bellows to the outside of the valve box part when the outer bellows is damaged. The bellows valve according to claim 1, further comprising a portion.   4. The bellows valve according to claim 3, wherein the discharge part is formed so as to open a groove part in the inner bellows and to discharge the liquid that has entered through the hole part.   The bellows valve according to claim 3, wherein the discharge part is formed so that a hole is formed in a wall of the valve box part and the intrusion liquid can be discharged through the hole.

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