JP3007966U - Seal structure - Google Patents

Abstract

(57) [Abstract] [Purpose] An excellent sealing action that prevents the invasion of outside air into the seal part and prevents the contamination of products inside the seal part due to various bacteria in the outside air, and the disinfection and cleaning of the seal part at the same time. To provide a seal structure that can be realized at low cost. [Structure] The seal parts around the shafts 31, 32 are equipped with steam supply / discharge mechanisms 53, 56 for injecting pressurized steam, and the shaft 31 is controlled by the steam pressure of the pressurized steam injected by the steam supply / discharge mechanisms 53, 56. , A structure that seals around 32.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a seal structure around an axis, and more particularly, to a seal structure suitable for use in a sterilized product or an aseptic product manufacturing facility.

[0002]

[Prior art]

 For example, as a seal structure for preventing liquid leakage from the insertion portion of the valve shaft of a valve system used in plant equipment, etc., a valve shaft insertion of a valve housing that slidably supports the valve shaft has been conventionally used. A technique of interposing a ring-shaped seal member or a bush that functions as a packing in the portion is widely used.

[0003]

[Problems to be solved by the device]

 However, it is not easy to ensure a high degree of airtightness with the above-described seal structure using a ring-shaped seal member or bush.For example, outside air may enter the inside of the seal part and There is a risk of contaminating the product inside the seal.

Further, there is a risk that the liquid of the product and the like penetrates into the extremely minute gaps in the seal portion and becomes a hotbed in which miscellaneous bacteria propagate due to long-term retention. Therefore, in the case of valve systems used in manufacturing plants for sterilized products and aseptic products, it is required to frequently and carefully clean the area around the seal part of the valve shaft with disinfectant. Therefore, there have been problems that the running cost of the equipment is high and the productivity is reduced.

Therefore, an object of the present invention is to solve the above problems, and has an excellent sealing action to prevent the invasion of outside air into the seal portion and prevent the contamination of the product in the seal portion due to various bacteria in the outside air. It is possible to realize the disinfection / cleaning of the seal part at the same time and at a low cost, and by using it in the valve system of the sterilized product or aseptic product manufacturing plant, the running cost can be reduced and the productivity can be improved. It is to provide a seal structure capable of performing.

[0006]

[Means for Solving the Problems]

 The above object of the present invention is to equip a seal part around the shaft with a steam supply / discharge mechanism for injecting pressurized steam, and to seal around the shaft by the pressure of the pressurized steam injected by the steam supply / discharge mechanism. Is achieved by a seal structure characterized by

Further, in the above seal structure, the above object can also be achieved by a configuration characterized in that the shaft is a valve shaft in a valve system.

[0008]

[Action]

 According to the above-mentioned structure of the present invention, since the shaft is sealed by the pressure of the pressurized steam injected into the seal portion around the shaft, the sealing is performed using the seal ring which is a molded product made of a material such as synthetic rubber. Compared to the above case, it is possible to apply the pressure required for sealing evenly around the shaft regardless of the shape of the seal part, so that the inside and outside of the seal part can be blocked by steam, and the outside air can enter the seal part. It is possible to prevent the above and to prevent the contamination of the product in the seal part due to various bacteria in the outside air, etc.

Moreover, in the steam supply / discharge mechanism for injecting pressurized steam into the seal part, for example, a nozzle for supplying steam to the seal part and a nozzle for restricting discharge of the supplied steam are arranged near the seal part. This can be achieved by a simple configuration of the above. Furthermore, by appropriately setting the temperature of the steam to be supplied or appropriately using a chemical as the liquid to be supplied in the form of steam, the cost of the seal and the seal part can be reduced at a low cost. It becomes possible to disinfect and wash.

[0010]

【Example】

 FIG. 1 shows a schematic configuration of a valve system using a seal structure according to the present invention.

This valve system is a double-seat valve that realizes mixing or prevention of mixing of two fluids having different compositions in a plant facility by opening and closing the valves, and a pair of pipe lines 11 and 12 serving as fluid flow passages. , A pair of valve housings 14 and 15 located at the ends of these conduits 11 and 12, a clamp joint 16 that connects the pair of valve housings 14 and 15 to each other, and inside the respective valve housings 14 and 15. Of the valves 18 and 19 provided in the valve housing 18, the seat rings 25 that provide the valve seat portions on which the valve bodies 20 and 21 of the valves 18 and 19 are seated, and the valves 18 and 19 in the valve housings 14 and 15, respectively. A valve control unit 27 for controlling the operation is connected to the other end of one valve housing 14. The lamp joint 28 and the clamp joint 29 covering the other end of the other bulb housing 15 are provided.

Here, each of the valves 18 and 19 has a structure including the above-mentioned valve bodies 20 and 21 and valve shafts (valve stems) 31 and 32 integrated with the valve bodies 20 and 21. There is.

On the other hand, the seat ring 25 is held by the clamp joint 16. As the valve seat portion on which the valve bodies 20 and 21 are seated, a sealing surface 34 corresponding to the sealing surface on the valve body 20 and a sealing surface 35 corresponding to the sealing surface on the valve body 21 are provided. It is configured to have.

The above-mentioned sealing surfaces 34, 35 are arranged such that the corresponding sealing surfaces of the valves 18, 19 are butted against each other with the packings 38, 39 sandwiched therebetween, so that the passage of fluid between the butted sealing surfaces. Prevent.

Each of the valve shafts 31 and 32 of the valves 18 and 19 described above has a tubular shape. The valve shaft 31 communicates with the valve control unit 27 by inserting the substantially disc-shaped flange 51 held by the clamp joint 28. In the insertion part of the flange 51, the flange 51 and the valve shaft 31 are connected to each other. A cylindrical stem seal 52 and a steam supply / discharge mechanism 53 interposed between the shaft seals around the shaft.

Similarly, in the case of the valve shaft 32, the substantially disk-shaped flange 54 held by the clamp joint 29 is inserted, and the flange 54 and the valve shaft 32 are inserted in the insertion portion of the flange 54. A cylindrical stem seal 55 and a steam supply / discharge mechanism 56 interposed between and form a seal around the shaft.

The seal structure formed by the stem seal 52 and the steam supply / discharge mechanism 53 and the seal structure formed by the stem seal 55 and the steam supply / discharge mechanism 56 are examples of the present invention, and will be described in detail below. . The stem seals 52 and 53 have the same structure, and the outer peripheral portion is airtightly fitted to the corresponding flanges 51 and 54, and the inner peripheral portion is slidably fitted to the corresponding valve shafts 31 and 32. There is.

Further, the steam supply / discharge mechanism 53 causes pressurized steam to act on the open end of the stem seal 52, and seals the gap between the stem seal 52 and the valve shaft 31 by the pressure of the steam. Then, the steam supply / discharge mechanism 56 causes pressurized steam to act on the open end of the stem seal 55, and seals the gap between the stem seal 55 and the valve shaft 32 by the pressure of the steam.

These steam supply / discharge mechanisms 53 and 56 have the same structure and communicate with the open ends of the corresponding stem seals 52 and 55, and the steam flow path 58 that goes around the corresponding valve shafts 31 and 32. A cylindrical block 59 that forms a nozzle, a nozzle 60 that is fixed to the block 59 and injects steam into the steam flow path 58, and a pressure that regulates the discharge of the steam injected into the steam flow path 58 by the nozzle 60. The regulation nozzle 61 is provided.

Here, the pressure and temperature of the vapor supplied by the nozzle 60, the component of the liquid supplied as vapor, and the like are the pressure of the fluid that controls the flow in the valve system, the component of the fluid, or the stem. It is appropriately set depending on the fitting accuracy of the seals 52 and 55.

According to the seal structure of the above-described embodiment, since the shaft is sealed by the pressure of the pressurized steam injected into the seal portion around the shaft, the seal ring which is a molded product made of a material such as synthetic rubber. Compared with the conventional case of sealing using a seal, etc., the pressure necessary for sealing can be applied uniformly around the shaft regardless of the shape of the seal, etc., and the inside and outside of the seal can be blocked by steam, It is possible to realize an excellent seal that completely prevents invasion of outside air into the seal portion and prevents contamination of products in the seal portion due to various bacteria in the outside air.

Moreover, as shown in the figure, the steam supply / discharge mechanisms 53 and 56 for injecting pressurized steam into the seal portion are nozzles 60 for supplying steam to the seal portion and pressure regulating nozzles for regulating discharge of the supplied vapor. This can be achieved by a simple structure in which 61 and 61 are arranged in the vicinity of the seal portion, and further, by appropriately setting the temperature of the steam to be supplied or appropriately using chemicals as the liquid to be supplied as steam, it is possible to reduce the cost. It is possible to sterilize and clean the seal part at the same time as the seal.

Therefore, for example, even when used as a valve system for a sterilized product or a manufacturing plant for aseptic products, it is not necessary to perform special disinfection / cleaning treatment, and it is possible to reduce running costs and improve productivity. You can

In the above embodiment, the seal structure around the valve shaft in the valve system has been described. However, the seal structure of the present invention can slide an airtight container or a liquidtight container in addition to the valve system. It can be used for various shafts that can be inserted rotatably or rotatably.

[0025]

EFFECTS OF THE INVENTION According to the sealing structure of the present invention, compared with the conventional case in which a seal ring, which is a molded product of a material such as synthetic rubber, is used for sealing, regardless of the shape of the sealing portion, the shaft rotation The pressure necessary for sealing can be applied evenly to the inside and outside of the seal part with steam to prevent outside air from entering the seal part, and contamination of products inside the seal part due to bacteria etc. in the outside air. It is possible to perform excellent sealing to prevent Moreover, the steam supply / discharge mechanism for injecting pressurized steam into the seal part is simple in that a nozzle for supplying steam to the seal part and a nozzle for restricting discharge of the supplied steam are arranged near the seal part. This can be achieved with a simple structure, and by appropriately setting the temperature of the steam to be supplied or appropriately using a chemical as the liquid to be supplied as steam, it is possible to inexpensively disinfect and clean the seal part at the same time as the seal. It becomes possible to do. Therefore, for example, by using it in a valve system of a manufacturing plant for sterilized products and aseptic products, it is possible to avoid the execution of special disinfection / washing processing, reduce the running cost and improve the productivity.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a valve system using a seal structure according to an embodiment of the present invention.

[Explanation of symbols]

 11, 12 Pipe line 14, 15 Valve housing 16 Clamp joint 18, 19 Valve 20, 21 Valve body 25 Seat ring 27 Valve control unit 31, 32 Valve shaft 34, 35 Sealing surface 51, 54 Flange 52, 55 Stem seal 53, 56 Steam Supply / Discharge Mechanism 58 Steam Flow Path 59 Block 60 Nozzle 61 Pressure Regulation Nozzle

Claims (2)

[Scope of utility model registration request] 1. A steam supply / exhaust mechanism for injecting pressurized steam into a seal portion around the shaft, and sealing around the shaft by the pressure of the pressurized steam injected by the steam supply / discharge mechanism. Seal structure. 2. The seal structure according to claim 1, wherein the shaft is a valve shaft in a valve system.