JP4235536B2 - Double seal valve - Google Patents

Description

  The present invention relates to a seal valve used in a liquid distribution line in machinery or plants for food production, brewing, and the like, and more particularly, to a double seal valve that prevents mixing of two liquids by sealing a flow path twice. is there.

As a prior art of this type of double seal valve , as shown in FIG. 2 , a valve seat 6 is provided in a communication passage 3 formed between an upper flow path 1 and a lower flow path 2. The first valve body 7 that engages with the circumferential side is slidably engaged with the first valve shaft 8 and the second valve body 9 that is pressed and engaged with the upper side of the valve seat 6 is slidable with the first valve shaft 8. The first valve shaft 8 is provided on each of the second valve shafts 10 to be fitted, and the first valve shaft 8 is linked to a valve opening / closing drive mechanism (not shown) above the first valve shaft 8 so that the first valve is activated by opening the valve opening / closing drive mechanism. The second valve body 9 follows and moves with the upward movement of the shaft 8, and the outer peripheral surface of the lower shaft portion 8 b of the first valve shaft 8 protruding downward from the lower flow path 2, Between the inner peripheral surface of the lower cover member 15 that slidably supports the lower shaft portion 8b of the first valve shaft 8, and the outer peripheral surface of the second valve shaft 10 portion protruding upward from the upper flow path 1, this Washing annular passages 46 and 47 longer than the respective strokes of the first valve shaft 8 and the second valve shaft 10 between the inner peripheral surface of the upper cover member 13 that slidably supports the two valve shaft 10 portions. Are formed at the lower ends of the annular passages 46 and 47, and the cleaning liquid discharge ports 50 and 51 are provided at the upper ends. Therefore, according to this double seal valve, the lower shaft portion 8b of the first valve shaft 8 protruding downward from the lower flow path 2 and the second valve shaft 10 portion protruding upward from the upper flow path 1 are in contact with the atmosphere. However, the air contact portions of the valve shafts 8 and 10 can be cleaned by periodically supplying the cleaning liquid to the cleaning annular passages 46 and 47 from the cleaning liquid supply ports 48 and 49. In FIG. 2 , reference numeral 52 denotes a cleaning liquid supply port for supplying a cleaning liquid to the cleaning annular passage 53 between the outer peripheral surface of the upper shaft portion 8 a of the first valve shaft 8 and the inner peripheral surface of the second valve shaft 10.

  In the use of this type of double seal valve, a valve opening / closing drive mechanism is connected to the second valve shaft 10 protruding upward from the upper flow path 1, and the valve shaft 10 is covered with a cylinder or the like. Therefore, the second valve shaft 10 portion protruding from the upper flow path 1 has no problem, but the lower shaft portion 8b of the first valve shaft 8 protruding downward from the lower flow path 2 is positioned below and placed on the floor. Because it is close, it is easily contaminated, and dust containing various bacteria is likely to adhere. However, even if the cleaning liquid is supplied from the cleaning liquid supply port 48 to the cleaning annular passage 46 and the air contact portion of the valve shaft 8 is cleaned as described in the above-mentioned Patent Document 1, the dust adhering after cleaning is not cleaned. The inside of the valve may be contaminated through the passage 46.

In the double seal valve of the prior art , the cleaning liquid supply port 48 is provided at one end side of the cleaning annular passage 46, the cleaning liquid discharge port 50 is provided at the other end side, and the cleaning liquid supply port 49 is provided at one end side of the annular passage 47. The cleaning liquid discharge port 51 is provided at the other end, and the cleaning liquid supply port 52 is provided at one end of the cleaning annular passage 53 on the inner side, and the cleaning liquid supplied from the supply port 52 is lowered from the lower flow path 2. The first valve shaft 8 protrudes from the inside of the lower shaft portion 8b of the first valve shaft 8. That is, the same number of cleaning liquid supply ports and cleaning liquid discharge ports are provided. Then, when high temperature water or high temperature steam is used as the cleaning liquid during cleaning, if the worker forgets to close the cleaning liquid discharge port, the high temperature water or high temperature steam cleaning liquid will spout from the forgotten closing discharge port. , May lead to dangerous situations.

  A main object of the present invention is to provide a double seal valve which prevents contamination at a first valve shaft portion protruding downward from a lower flow path. Further, in the present invention, the cleaning liquid supply ports are respectively provided in the plurality of cleaning annular passages, and the cleaning liquid discharge ports are provided in one place so that the cleaning liquid discharged from the plurality of annular passages is concentrated and discharged in one place. By doing so, a double seal valve is provided which eliminates forgetting to close the cleaning liquid discharge port and prevents the occurrence of a dangerous situation.

Means for solving the above problems will be described with reference numerals of the embodiments described later. The invention according to claim 1 is a communication path 3 formed between the upper flow path 1 and the lower flow path 2. The first valve body 7 that engages with the inner peripheral side of the valve seat 6 is provided on the first valve shaft 8, and the second valve body 9 that presses and engages with the upper side of the valve seat 6. The second valve shaft 10 is slidably fitted to the first valve shaft 8, and the first valve shaft 8 is linked to the valve opening / closing drive mechanism so that the first valve shaft 8 is opened when the valve is opened. In the double seal valve in which the second valve body 9 moves following the first valve body 7 with the movement, the outer peripheral surface of the first valve shaft 8 portion protruding downward from the lower flow path 2 is slidably supported. lower the lower end 15a of the cover member 15 and the bag-like closed end portion, a dual seal valve formed by providing a drain port 16 which opens laterally into the bag-like closed end portion 15a, bottom stream The cleaning liquid supply port 28 is provided in the lower annular passage 26 for cleaning between the outer peripheral surface of the first valve shaft 8 projecting downward from 2 and the inner peripheral surface of the lower cover member 15, and the cleaning liquid supplied from the supply port 28 Is discharged into the bag-like closed end portion 15a through the lower annular passage 26 for cleaning, and the outer peripheral surface of the second valve shaft 10 portion protruding upward from the upper flow path 1 and the inner peripheral surface of the upper cover member 13 A cleaning liquid supply port 29 is provided in the upper annular passage 27 for cleaning between the two and the cleaning liquid supplied from the supply port 29 is passed through the upper annular passage 27 for cleaning, and then the communication port 32 of the second valve shaft 10 Two through the inner annular passage 23 for cleaning between the inner peripheral surface of the valve shaft 10 and the outer peripheral surface of the first valve shaft 8, and between the first valve body 7, the second valve body 9 and the valve seat 6. A cleaning liquid supply port 17 is provided in the inner annular passage 23 for washing, and is poured into the annular chamber 22. The cleaning liquid supplied from the supply port 17 is passed through the cleaning inner annular passage 23 and flows into the internal passage 20 of the first valve shaft 8 from the communication hole 19 of the first valve shaft 8. Is injected into the annular chamber 22 from the cleaning liquid ejection hole 21, and the cleaning liquid in the annular chamber 22 is passed through the through hole 24 of the first valve body 7 through the internal discharge passage 25 in the first valve shaft 8 and the bag-like closed end portion. It is configured to be discharged into 15a.

  The effect of the invention by the above solution will be described with reference numerals of the embodiments described later. According to the double seal valve of the invention according to claim 1, the first valve protruding downward from the lower flow path 2 is used. By forming the lower end portion 15a of the lower cover member 15 that slidably supports the outer peripheral surface of the shaft 8 portion as a bag-like closed end portion, and providing a drain port 16 that opens laterally at the bag-like closed end portion 15a. Since the first valve shaft 8 portion that protrudes from the lower flow path 2 and is close to the floor is covered with the bag-like closed end portion 15a at the lower end portion of the lower cover member 15, dust or the like containing various germs is difficult to adhere. There is very little risk of contamination inside the valve.

  Further, according to the double seal valve of the present invention, the inside of the double seal valve and the portions of the valve shafts 8 and 10 which protrude downward from the upper and lower flow paths 1 and 2 and easily come into contact with the outside air are effectively cleaned. In addition, the cleaning liquid that has been cleaned can be finally collected in one drain port 16 provided in the bag-like closed end portion 15a at the lower end of the lower cover member, and discharged from the drain port 16. This eliminates the possibility of forgetting to close the cleaning fluid outlet, which prevents the occurrence of dangerous situations such as the ejection of cleaning fluid from the outlet that was forgotten to close, or the ejection of high-temperature sterilization steam supplied after cleaning. I can do it. Further, according to the structure in which the cleaning liquid that has been cleaned is collected and discharged to one drain port 16, there is no liquid pool in the middle of the flow path, and the cleaning liquid can be reliably discharged without remaining inside, Therefore, this high temperature steam can be effectively acted without causing a temperature drop of the high temperature sterilization steam supplied after washing.

  FIG. 1 is a longitudinal sectional view showing an embodiment of a double seal valve according to the present invention. In this figure, 1 is an upper flow path, 2 is a lower flow path, and the upper flow path 1 and the lower flow path 2 are formed in parallel or intersecting directions. A passage 3 is formed, and an upper opening 4 and a lower opening 5 are formed at portions of the two flow paths 1 and 2 that are coaxially opposed to the communication passage 3, and a valve seat 6 is attached to the communication passage 3. ing. For example, various beverage liquids or cleaning liquids are circulated through the upper flow path 1 and the lower flow path 2, respectively.

  Reference numeral 7 denotes a first valve body that engages with the inner peripheral side of the valve seat 6, and an upper shaft portion 8 a of the first valve shaft 8 that is inserted from the upper opening portion 4 through the communication path 3 to the lower opening portion 5 side. Are integrally formed at the lower end of the. A hollow lower shaft portion 8b is coaxially formed integrally with the lower portion of the first valve body 7, and the upper portion of the upper shaft portion 8a is connected to a valve opening / closing drive mechanism including an air cylinder, although not shown. ing. A first valve shaft 8 is formed by the upper shaft portion 8a and the lower shaft portion 8b. Reference numeral 9 denotes a second valve body which is located on the upper side of the first valve body 7 and is pressed and engaged with the upper side of the valve seat 6 from above, and is fitted into the upper shaft portion 8 a of the first valve shaft 8. Further, the second valve shaft 10 is integrally formed at the lower end portion. Although not shown, the second valve shaft 10 is always urged downward by a first spring made of a coil spring, thereby pressing the second valve body 9 against the upper side of the valve seat 6.

  A main annular packing 11 that is slidably in close contact with the inner peripheral side of the valve seat 6 is attached to the first valve body 7, and a secondary annular packing that is in close contact with the upper side of the valve seat 6 is attached to the second valve body 9. 12 is attached. The upper opening 4 of the upper flow path 1 is provided with an upper cover member 13 that slidably supports the outer peripheral surface of the second valve shaft 10 protruding upward from the opening 4. A packing 14 is interposed between the upper opening 4 and the second valve shaft 10. The lower opening 5 of the lower flow path 2 is provided with a lower cover member 15 that slidably supports the outer peripheral surface of the lower shaft portion 8b of the first valve shaft 8 protruding downward from the opening 5. A packing 14 is interposed between the lower cover member 15, the lower opening 5, and the first valve shaft 8.

  The lower end portion 15a of the lower cover member 15 that slidably supports the outer peripheral surface of the lower shaft portion 8b of the first valve shaft 8 projecting downward from the lower flow path 2 has a bag-like closed end portion as shown in the figure. The bag-like closed end portion 15 a is provided with a drain port 16 that opens laterally, that is, opens in a direction orthogonal to the axial direction of the first valve shaft 8. Although not shown, a drain pipe is connected to the drain port 16.

  As shown in FIG. 1, a cleaning liquid supply port 17 is provided at a required portion of the second valve shaft 10 protruding upward from the upper flow path 1, and a base 18 for connecting a cleaning liquid hose is attached to the cleaning liquid supply port 17. . The cleaning liquid supply port 17 is connected to an internal passage 20 provided along the central axis of the upper shaft portion 8a of the first valve shaft 8 through the communication hole 19, and this internal passage 20 is connected to the upper shaft portion 8a. It communicates with an annular chamber 22 formed between the first valve body 7, the second valve body 9, and the valve seat 6 through a plurality of cleaning liquid ejection holes 21 provided radially at the lower end. Further, between the outer peripheral surface of the upper shaft portion 8 a of the first valve shaft 8 and the inner peripheral surface of the second valve shaft 10, the cleaning liquid supplied from the cleaning liquid supply port 17 is passed from the communication hole 19 to the internal passage 20. A cleaning inner annular passage 23 is formed so as to be actively introduced at the same time as being introduced into the annular chamber 22 and discharged from the lower end of the upper shaft portion 8a to the annular chamber 22.

  When the cleaning liquid is supplied from the cleaning liquid supply port 17, for example, 70% of the flow rate of the supplied cleaning liquid is introduced into the internal passage 20 of the upper shaft portion 8a from the communication hole 19, and the remaining 30% is used for cleaning. Simultaneously introduced into the inner annular passage 23. The cleaning liquid introduced from the communication hole 19 enters the internal passage 20 of the upper shaft portion 8a, and is jetted into the annular chamber 22 from the respective cleaning liquid ejection holes 21 at the lower end portion. After the inner periphery of the valve body 7 and the inner parts of the valve bodies 7 and 9 are washed, the bag-like blockage of the lower cover member 15 is made from the discharge passage 25 inside the lower shaft portion 8b of the first valve shaft 8 through the plurality of through holes 24. It is discharged into the end 15a. On the other hand, the cleaning liquid introduced into the cleaning inner annular passage 23 is discharged to the lower annular chamber 22 while cleaning the inner annular passage 23 and passes through the plurality of through holes 24 in the same manner as described above. It is discharged from the discharge passage 25 inside the lower shaft portion 8b into the bag-like closed end portion 15a of the lower cover member 15. Note that sterilization steam is supplied from the cleaning fluid supply port 17 after cleaning, and is discharged into the bag-like closed end portion 15a in the same manner as the cleaning liquid.

  Further, the outer peripheral surface of the lower shaft portion 8b (first valve shaft portion) of the first valve shaft 8 protruding downward from the lower flow path 2 and the inner periphery of the lower cover member 15 that slidably supports the shaft portion. The outer peripheral surface of the portion of the second valve shaft 10 (second valve shaft portion) protruding upward from the upper flow path 1 and the upper cover member 13 that slidably supports the shaft portion. Washing annular passages 26 and 27 longer than the maximum strokes of the first valve shaft 8 and the second valve shaft 10 are formed between the circumferential surfaces and the upper ends of the washing annular passages 26 and 27, respectively. The cleaning liquid supply ports 28 and 29 are provided in the section, and the bases 30 and 31 for connecting the cleaning liquid supply hose are attached to the supply ports 28 and 29, respectively. A lower end portion of the cleaning upper annular passage 27 communicates with the cleaning annular passage 23 via a communication hole 32 provided in the second valve shaft 10, and a lower end portion of the cleaning lower annular passage 26 is a lower cover member 15. To the inside of the bag-like closed end portion 15a.

  Then, when the pressurized cleaning liquid is supplied from the cleaning liquid supply port 28, the cleaning liquid sufficiently cleans the outer peripheral surface of the lower shaft portion 8b of the first valve shaft 8 while flowing through the lower annular passage 26 for cleaning. The lower annular passage 26 is discharged from the lower end portion into the bag-like closed end portion 15 a of the lower cover member 15. Since a spiral groove 26a is formed on the inner peripheral surface of the lower cover member 15 forming the cleaning lower annular passage 26, the cleaning liquid flowing through the annular passage 26 forms a spiral flow, and the lower shaft The outer peripheral surface of the portion 8b can be more effectively cleaned.

  Further, when the pressurized cleaning liquid is supplied from the cleaning liquid supply port 29, the cleaning liquid is provided in the second valve shaft 10 after sufficiently cleaning the outer peripheral surface of the second valve shaft 10 while flowing through the cleaning upper annular passage 27. The communication hole 32 is introduced into the cleaning inner annular passage 23 between the outer peripheral surface of the upper shaft portion 8 a of the first valve shaft 8 and the inner peripheral surface of the second valve shaft 10. The cleaning liquid introduced into the inner annular passage 23 for cleaning is discharged into the lower annular chamber 22 while cleaning the annular passage 23, and the inside of the lower shaft portion 8 b of the first valve shaft 8 from the plurality of through holes 24. It passes through the discharge path 25 and is discharged into the bag-like closed end 15 a of the lower cover member 15. Also in this case, since the spiral groove 27a is formed on the inner peripheral surface of the upper cover member 13 forming the cleaning upper annular passage 27, the cleaning liquid flowing through the annular passage 27 forms a spiral flow, and the second The outer peripheral surface of the valve shaft 10 can be cleaned more effectively. Note that sterilization steam is supplied from the cleaning fluid supply ports 28 and 29 after cleaning, and is discharged into the bag-like closed end portion 15a in the same manner as the cleaning liquid.

  As described above, the cleaning annular passage 23 between the outer peripheral surface of the upper shaft portion 8a of the first valve shaft 8 and the inner peripheral surface of the second valve shaft 10 from the cleaning liquid supply ports 17, 28, 29 provided at three locations as described above. An inner passage 20 in the upper shaft portion 8a of the first valve shaft 8, a lower annular passage 26 for cleaning between the outer peripheral surface of the lower shaft portion 8b of the first valve shaft 8 and the inner peripheral surface of the lower cover member 15, and The cleaning liquid supplied to the cleaning upper annular passage 27 between the outer peripheral surface of the upper shaft portion 8 a of the single valve shaft 8 and the inner peripheral surface of the upper cover member 13 is finally the bag-like closed end of the lower cover member 15. It is collected in the portion 15a and discharged from a drain port 16 that opens laterally to the bag-like closed end portion 15a to a predetermined place by a drain pipe (not shown). The cleaning liquid discharged through the plurality of annular passages 23, 26, and 27 is collected in one drain port 16 as a single discharge port. By letting it discharge, there is no risk of forgetting to close the cleaning fluid outlet, as in the past, so there is a danger that the cleaning fluid will spout from the outlet that you forgot to close or high temperature steam for sterilization supplied after cleaning will spout. The occurrence of a serious situation can be prevented. Further, according to the structure in which the cleaning liquid supplied from the plurality of cleaning fluid supply ports 17, 28, and 29 is collected and discharged to one drain port 16, the liquid is provided in the middle of the flow path. There is no accumulation, the cleaning liquid can be discharged reliably without remaining inside, and therefore the high temperature steam for sterilization supplied after cleaning does not cause a temperature drop, and this high temperature steam can be effectively operated. I can do it.

  Further, as shown in FIG. 1, the cleaning liquid supply pipe 33 for supplying the cleaning liquid to the cleaning liquid supply ports 17, 28, 29 is branched into three on the way, and the branched pipes 33a, 33b, 33c branched into the three are provided. The cleaning liquid supply ports 17, 28, 29 are connected to the caps 18, 30, 31 respectively attached thereto. Accordingly, when cleaning the double seal valve, it is only necessary to supply the cleaning liquid to one cleaning liquid supply pipe 33. Therefore, the piping of the cleaning liquid system can be simplified in combination with the fact that there is only one cleaning liquid discharge point. The cleaning work becomes easy and the maintenance becomes easy.

It is a longitudinal cross-sectional view of the double seal valve by one Embodiment of this invention. It is a longitudinal cross-sectional view of the conventional double seal valve.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Upper flow path 2 Lower flow path 3 Communication path 6 Valve seat 7 1st valve body 8 1st valve shaft 9 2nd valve body 10 2nd valve shaft 13 Upper cover member 15 Lower cover member 15a Bag-like obstruction | occlusion of a lower cover member End 16 Drain port 17 Cleaning liquid supply port 23 Cleaning inner annular passage 26 Cleaning lower annular passage 27 Cleaning upper annular passage 28 Cleaning liquid supply port 29 Cleaning liquid supply port

Claims (1)

A valve seat is provided in the communication path formed between the upper flow path and the lower flow path, and the first valve body engaged with the inner peripheral side of the valve seat is pushed to the first valve shaft and to the upper side of the valve seat. A second valve body that is in contact with the first valve shaft is provided on a second valve shaft that is slidably fitted to the first valve shaft, and the first valve shaft is linked to a valve opening / closing drive mechanism so that the first valve shaft is opened when the valve is opened. In a double seal valve in which the second valve body moves following the first valve body as the one valve shaft moves upward, the outer peripheral surface of the first valve shaft portion protruding downward from the lower flow path is slidable. A double seal valve in which the lower end portion of the lower cover member to be supported is a bag-like closed end portion, and a drain port that opens laterally is provided at the bag-like closed end portion, and protrudes downward from the lower flow path. A cleaning liquid supply port is provided in the lower annular passage for cleaning between the outer peripheral surface of the first valve shaft portion and the inner peripheral surface of the lower cover member, and the cleaning liquid supplied from this supply port is disposed in the lower annular for cleaning. The cleaning liquid is discharged into the bag-like closed end portion through the passage, and in the cleaning upper annular passage between the outer peripheral surface of the second valve shaft portion protruding upward from the upper flow path and the inner peripheral surface of the upper cover member. A supply port is provided, and the cleaning liquid supplied from this supply port is passed through the upper annular passage for cleaning, and then the communication port of the second valve shaft connects the inner peripheral surface of the second valve shaft and the outer peripheral surface of the first valve shaft. Between the first valve body, the second valve body and the valve seat, and a cleaning liquid supply port is provided in the inner annular passage for cleaning. The supplied cleaning liquid is passed through the cleaning inner annular passage and flows into the internal passage of the first valve shaft from the communication hole of the first valve shaft, and the cleaning liquid flowing into the internal passage is injected into the annular chamber from the cleaning liquid ejection hole. The cleaning liquid in the annular chamber is discharged from the through hole of the first valve body through the internal discharge passage in the first valve shaft. Dual seal valve formed by configured to discharge into a bag shape closed end portion.

Images