CN205243825U - A bypass valve for helium compressor - Google Patents

Abstract

The utility model relates to the technical field of valves, and discloses a bypass valve for a helium compressor, comprising a valve casing (1), and O-ring sealing grooves (2) are arranged on the left end and the right end of the valve casing (1). ), the O-ring sealing groove (2) is provided with a fluorine rubber O-ring (3) that matches the O-ring sealing groove (2), and both ends of the valve housing (1) are provided with external threads, and the design is also included The nuts (4) at both ends of the valve casing (1) and the external threads of the valve casing (1) and the connectors (5) arranged at the two ends of the valve casing (1), the connectors (5) pass through the nuts (4) Cooperate and lock with the valve housing (1). The nut (4) of the utility model makes the connecting head (5) closely cooperate with the end face of the valve casing (1), and fixes the fluorine rubber O-shaped sealing ring (3) to achieve the sealing effect. The fluorine rubber O-shaped sealing ring (3) It has better fatigue life under high temperature, high pressure and other working conditions of helium compressor bypass valve, and is easy to install and use.

Description

Bypass valves for helium compressors

technical field

The utility model relates to the technical field of valves, in particular to a bypass valve for a helium compressor.

Background technique

At present, the sealing method of the bypass valve adopts the sealing method of taper pipe thread with thread sealant, but in actual use, this sealing method is easy to age when the helium compressor works for a long time, and the leakage rate continues to increase, requiring more frequent repairs. Leak detection and re-gluing; and the complete curing of the thread sealant generally takes about 24 hours, which affects work efficiency.

Contents of the invention

Aiming at the shortcomings of unstable sealing and inconvenient sealing method in the prior art, the utility model provides a bypass valve for a helium compressor with stable sealing and convenient sealing method.

In order to solve the above technical problems, the utility model is solved through the following technical solutions:

A bypass valve for helium compressors, including a valve casing, O-ring sealing grooves are provided on the left and right ends of the valve casing, and fluorine seals that match the O-ring sealing grooves are provided in the O-ring sealing grooves. Rubber O-shaped sealing ring, both ends of the valve housing are provided with external threads, and also include nuts located at both ends of the valve The cap is locked tightly with the valve housing. The left end and the right end are provided with O-ring sealing grooves to facilitate the installation of the fluororubber O-ring. The fluororubber O-ring has a better fatigue life under high temperature and high pressure working conditions of the bypass valve of the helium compressor. The steps of leak detection and sealant application often required by the bypass valve are avoided, the work intensity of the staff is reduced, and the work efficiency of the bypass is improved.

Preferably, the connecting head includes a connecting pipe and a connecting block integrated with the connecting pipe, the diameter of the connecting block is larger than that of the connecting pipe, the connecting block is arranged in a nut, and a circular hole matching the connecting pipe is provided on the nut. When the nut is tightened, the connecting block is driven to closely match the end face of the valve housing, and the fluororubber O-ring is fixedly installed in the O-ring sealing groove to improve the sealing effect of the device.

Preferably, the connecting pipe and the connecting block are provided with connected stepped holes. It is convenient to install and connect the connecting pipe and the outer pipe, and the step hole can make the connecting pipe cooperate with the outer pipes of various specifications to expand the application range of the technology.

Preferably, the diameter of the connection block is between the outer diameter of the sealing groove of the O-ring and the diameters of both ends of the valve housing. Ensure that when the connecting block is closely matched with the end face of the valve housing, the connecting block can completely press the fluororubber O-ring in the O-ring sealing groove, improve the sealing performance of the fluororubber O-ring, and prevent the fluororubber O-ring from loosening.

Preferably, an annular flow passage is provided in the valve casing, and the central axis of the flow passage, the central axis of the stepped hole and the central axis of the circular hole are on the same straight line. To ensure the smooth flow of the fluid, avoid too much collision between the fluid and the valve casing, resulting in loosening of the connection between the nut or the connecting pipe and the external pipe, and at the same time affecting the service life of the valve casing.

Due to the adoption of the above technical scheme, the utility model has remarkable technical effects: the nut makes the connecting head closely fit with the end face of the valve housing, and fixes the fluororubber O-ring to achieve the sealing effect. The bypass valve has better fatigue life under high temperature, high pressure and other working conditions, and is easy to install and use.

Description of drawings

Fig. 1 is a structural representation of the utility model

Fig. 2 is a sectional view of Fig. 1D-D.

Fig. 3 is a partially enlarged view of part M in Fig. 2 .

Fig. 4 is a schematic diagram of the nut structure.

The names of the parts indicated by the numbers in the attached drawings are as follows: 1—Valve housing, 2—O-ring sealing groove, 3—Viton O-ring, 4—Nut, 5—Connector, 6—Connecting pipe , 7—connecting block, 8—round hole, 9—step hole, 10—runner.

detailed description

Below in conjunction with accompanying drawing and embodiment the utility model is described in further detail.

Example 1

A bypass valve for a helium compressor, as shown in Figures 1 to 4, includes a valve casing 1, and the left and right ends of the valve casing 1 are provided with O-ring sealing grooves 2, O-ring sealing grooves 2 is equipped with a fluorine rubber O-ring 3 that cooperates with the O-ring sealing groove 2. Both ends of the valve housing 1 are provided with external threads, and there are also valves that are located at both ends of the valve housing 1 and cooperate with the external threads of the valve housing 1. The nut 4 and the connecting head 5 arranged at both ends of the valve casing 1, the connecting head 5 is locked with the valve casing 1 through the nut 4, the connecting head 5 includes a connecting pipe 6 and a connecting block 7 integrated with the connecting pipe 6, The diameter of the connection block 7 is larger than the diameter of the connection pipe 6, and the connection block 7 is set in the nut 4. When the nut 4 is tightened on the external thread of the valve casing 1, it drives the connection block 7 to move to the end surface of the valve casing 1, so that the connection The block 7 is closely matched with the end face of the valve housing 1, and the nut 4 is provided with a round hole 8 which is matched with the connecting pipe 6. The connecting pipe 6 and the connecting block 7 are provided with a connected step hole 9, and the large diameter hole of the step hole 9 is provided On the outermost side of the connecting pipe 6, it is convenient for the installation of the external pipe. A middle-diameter hole is also provided on the side adjacent to the large-diameter hole, which expands the specification range of the installation pipe. Between the outer diameter and the diameters at both ends of the valve casing 1, when the connecting block 7 is closely attached to the end surface of the valve casing 1, ensure that the nut 4 can drive the connecting block 7 to move and at the same time completely press the fluororubber O-ring 3, To improve the sealing effect, the valve casing 1 is provided with an annular flow channel 10, the central axis of the flow channel 10, the central axis of the stepped hole 9 and the centerline axis of the round hole 8 are on the same straight line, the flow channel 10 includes three sections from the right The first flow channel, the second flow channel, and the third flow channel connected in sequence to the left, the diameters of the three sections of flow channels decrease from right to left.

In a word, the above descriptions are only preferred embodiments of the present utility model, and all equal changes and modifications made according to the patent scope of the utility model should fall within the scope of the utility model patent.

Claims (5)

1. for the by-passing valve of helium compressor, comprise valve casing (1), it is characterized in that: the left end of valve casing (1)On portion and right part, be equipped with O type circle seal groove (2), in O type circle seal groove (2), be provided with O type circle closeThe fluororubber O-type sealing ring (3) that sealing groove (2) coordinates, valve casing (1) two ends are equipped with external screw thread, also bagDraw together the nut (4) that is located at valve casing (1) two ends and coordinate with valve casing (1) external screw thread and be located at valve casing (1)The connector (5) at both ends, connector (5) locks by nut (4) and valve casing (1).

2. the by-passing valve for helium compressor according to claim 1, is characterized in that: connector (5)Comprise tube connector (6) and the contiguous block (7) with tube connector (6) one, the diameter of contiguous block (7) is greater thanThe diameter of tube connector (6), contiguous block (7) is located in nut (4), and nut (4) is provided with and is connectedThe circular hole (8) that pipe (6) coordinates.

3. the by-passing valve for helium compressor according to claim 2, is characterized in that: tube connector (6)And in contiguous block (7), be provided with the stepped hole (9) communicating.

4. the by-passing valve for helium compressor according to claim 2, is characterized in that: contiguous block (7)Diameter at the overall diameter of O type circle seal groove (2) between the diameter at valve casing (1) two ends.

5. the by-passing valve for helium compressor according to claim 3, is characterized in that: valve casing (1)Inside be provided with annular runner (10), the central axis of runner (10), the central axis of stepped hole (9) andThe middle bobbin thread of circular hole (8) is on same straight line.