Self-sealing valve for air pressure instrument

Abstract

The utility model belongs to the technical field of self-sealing valves, and particularly discloses a self-sealing valve for an air pressure instrument, which comprises a valve core, a valve seat, a valve sleeve, a compression spring and a pressure head, a cavity is arranged in the valve seat, an opening is arranged at the top end of the valve seat, a through hole is arranged between the cavity and the opening, the valve core is inserted in the through hole, and the valve sleeve is arranged in the valve core. The two ends of the valve element extend into the opening and the cavity respectively, a threaded hole is formed in the top end of the valve element, the pressing head is located at the top end of the valve element and connected into the threaded hole in a threaded mode, a sealing pressing block is arranged at the position, close to the pressing head, of the valve element, and the lower portion of the sealing pressing block is sleeved with an O-shaped sealing ring. The valve sleeve is located below the compression spring, a clamping spring groove is formed in the tail end of the valve element, a steel wire clamping spring for a shaft is arranged below the valve sleeve in a sleeved mode and fixed in the clamping spring groove, a sealing cap nut is arranged below the valve seat in a sleeved mode and connected in a threaded mode, the structure is simple, installation is convenient, and high cost performance is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of self-sealing valves, in particular to a self-sealing valve for air pressure instruments. Background Art

[0002] Air pressure instruments are industrial automation instruments used to measure gas or liquid pressure, also known as pressure gauges or pressure gauges. When in use, in order to prevent leakage, it is generally necessary to install a self-sealing valve. A self-sealing valve is a valve structure that can be sealed without external force in the closed state.

[0003] However, the existing self-sealing valves are generally welded using traditional methods, where the welding worker presses the flange onto the spring tube assembly of the case for welding. During welding, the flange cannot be guaranteed to be concentric with the case, and it is not convenient to weld. Obviously, the current welding of the flange of the case spring tube assembly has problems such as inaccurate center position and inconvenient welding; therefore, customers in the equipment field hope that the SF6 gas density relay supplier will innovate in this regard. Utility Model Content

[0004] The purpose of the utility model is to provide a self-sealing valve for air pressure instruments to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a self-sealing valve for pneumatic instruments, comprising a valve core, a valve seat, a valve sleeve, a compression spring and a pressure head, wherein a cavity is provided inside the valve seat, an opening is provided at the top of the valve seat, a through hole is provided between the cavity and the opening, the valve core is inserted in the through hole, two ends of the valve core respectively extend to the opening and the cavity, a threaded hole is provided at the top of the valve core, the pressure head is located at the top of the valve core and is threadedly connected in the threaded hole, a sealing block is provided at a position of the valve core near the pressure head, an O-ring is sleeved below the sealing block, the valve sleeve and the compression spring are arranged in the cavity and sleeved on the valve core, the valve sleeve is located below the compression spring, a retaining ring groove is provided at the end of the valve core, a steel wire retaining ring for a shaft is sleeved below the valve sleeve and fixed in the retaining ring groove, a sealing cap nut is sleeved below the valve seat and is threadedly connected, the pressure head and the sealing cap nut are designed to be threadedly connected, and are sealed with corresponding sealing gaskets to reduce welding points.

[0006] Preferably, the overall shape of the valve core is cylindrical.

[0007] Preferably, the cavity, the through hole and the opening are concentric, and the valve seat is cylindrical.

[0008] Preferably, the top of the pressure head is conical and is provided with an external thread.

[0009] Preferably, the valve sleeve is in the shape of a circular ring, and the cross section of the valve sleeve is in an L shape.

[0010] Preferably, the cross section of the sealing nut is in the shape of a U.

[0011] Preferably, an outer ring is provided near the middle of the valve seat, and a flat surface is provided on the side of the outer ring to facilitate the use of tools to fix the valve seat.

[0012] Preferably, a tool groove is provided at the bottom of the sealing cap nut to facilitate the use of a tool to screw the sealing cap nut.

[0013] Preferably, a rubber pad is provided between the valve seat and the sealing cap nut to improve the sealing effect.

[0014] Compared with the prior art, the beneficial effects of the utility model are:

[0015] The utility model realizes sealing between the valve core and the through hole by threading the pressure head onto the valve core, and realizes sealing between the valve core and the through hole by means of a sealing pressure block and an O-ring, and a spring and a valve sleeve are provided. The valve sleeve is fixed to the valve core retaining ring groove by means of a steel wire retaining ring for an axis, and a rubber pad is sealed between the valve seat and the sealing cap nut, and a threaded connection is adopted; thereby reducing welding points, the structure is simple, the installation is convenient, and the performance-price ratio is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the internal structure of the utility model;

[0017] Figure 2 It is a schematic diagram of the three-dimensional structure of the utility model.

[0018] In the figure: 1. steel wire retaining spring for shaft; 2. valve sleeve; 3. pressure head; 4. O-ring; 5. compression spring; 6. valve core; 601. sealing pressure block; 7. valve seat; 701. opening; 702. cavity; 703. outer ring; 704. plane; 8. rubber pad; 9. sealing cap nut; 901. tool groove. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0020] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "vertical", "upper", "lower", "horizontal", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model.

[0021] In the description of the present utility model, it should also be noted that unless otherwise clearly specified and defined, the terms "set", "installed", "connected", "connected to" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0022] Please refer to Figure 1-2 , the present utility model provides a technical solution: a self-sealing valve for a pneumatic instrument, including a valve core 6, a valve seat 7, a valve sleeve 2, a compression spring 5 and a pressing head 3. A cavity 702 is provided inside the valve seat 7, and an opening 701 is provided at the top of the valve seat 7. A through hole is provided between the cavity 702 and the opening 701. The valve core 6 is inserted into the through hole, and both ends of the valve core 6 extend into the opening 701 and the cavity 702 respectively. A threaded hole is provided at the top of the valve core 6. The pressing head 3 is located at the top of the valve core 6 and is threadedly connected to the threaded hole. A sealing block 601 is provided at the position of the valve core 6 close to the pressing head 3. An O-ring 4 is sleeved below the sealing block 601. The valve sleeve 2 and the compression spring 5 are arranged in the cavity 702 and sleeved on the valve core 6. The valve sleeve 2 is located below the compression spring 5. A circlip groove is provided at the end of the valve core 6. An axially retaining wire circlip 1 is sleeved below the valve sleeve 2 and fixed in the circlip groove. A sealing cap nut 9 is sleeved below the valve seat 7 and is threadedly connected. The pressing head 3 and the sealing cap nut 9 are designed to be threadedly connected and sealed with corresponding gaskets to reduce the welding points.

[0023] Further, the overall shape of the valve core 6 is cylindrical.

[0024] Further, the cavity 702, the through hole and the opening 701 are concentric, and the valve seat 7 is cylindrical.

[0025] Further, the top of the pressing head 3 is conical, and external threads are provided on the top of the pressing head 3.

[0026] Further, the valve sleeve 2 is annular, and the cross section of the valve sleeve 2 is L-shaped.

[0027] Further, the cross section of the sealing cap nut 9 is U-shaped.

[0028] Furthermore, an outer ring 703 is provided near the middle of the valve seat 7 , and a flat surface 704 is provided on the side of the outer ring 703 to facilitate fixing the valve seat 7 with tools.

[0029] Furthermore, a tool groove 901 is provided at the bottom of the sealing cap nut 9 to facilitate the use of a tool to screw the sealing cap nut 9 .

[0030] Furthermore, a rubber pad 8 is provided between the valve seat 7 and the sealing cap nut 9 to improve the sealing effect.

[0031] To sum up, in the self-sealing valve for air pressure instruments, the top of the valve core 6 is connected to the pressure head 3 through a thread, the bottom of the valve core 6 passes through an O-ring and is fixedly connected through a valve seat 7, a spring is put on the bottom of the valve core 6, and then a valve sleeve 2 is put on, and finally a steel wire retaining ring 1 is put on the shaft to fix it on the retaining ring groove of the valve core 6, a rubber pad 8 is placed between the valve seat 7 and the sealing cap nut 9 for sealing and connected through threads; the structure is simple, the installation is convenient, and it has a high cost performance.

[0032] It is worth noting that the entire device is controlled by a main control button. Since the device matched with the control button is a common device and belongs to the existing mature technology, its electrical connection relationship and specific circuit structure will not be described in detail here.

[0033] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A self-sealing valve for air pressure instruments, characterized in that: It includes a valve core (6), a valve seat (7), a valve sleeve (2), a compression spring (5) and a pressure head (3). A cavity (702) is formed inside the valve seat (7), an opening (701) is formed at the top end of the valve seat (7), a through hole is formed between the cavity (702) and the opening (701), the valve core (6) is inserted in the through hole, both ends of the valve core (6) extend into the opening (701) and the cavity (702) respectively, a threaded hole is formed at the top end of the valve core (6), the pressure head (3) is located at the top end of the valve core (6) and is threadedly connected in the threaded hole, a sealing press block (601) is provided at a position of the valve core (6) close to the pressure head (3), an O-ring (4) is sleeved below the sealing press block (601), the valve sleeve (2) and the compression spring (5) are arranged in the cavity (702) and sleeved on the valve core (6), the valve sleeve (2) is located below the compression spring (5), a snap ring groove is formed at the end of the valve core (6), an axial wire snap ring (1) is sleeved below the valve sleeve (2) and fixed in the snap ring groove, and a cap nut (9) is sleeved below the valve seat (7) and is threadedly connected.

2. The self-sealing valve for air pressure instruments according to claim 1, characterized in that: The overall shape of the valve core (6) is cylindrical.

3. The self-sealing valve for air pressure instruments according to claim 1, characterized in that: The cavity (702), the through hole and the opening (701) are concentric, and the valve seat (7) is cylindrical.

4. The self-sealing valve for air pressure instruments according to claim 1, characterized in that: The top of the pressure head (3) is conical, and external threads are provided on the top of the pressure head (3).

5. The self-sealing valve for air pressure instruments according to claim 1, characterized in that: The valve sleeve (2) is annular, and the cross-section of the valve sleeve (2) is L-shaped.

6. The self-sealing valve for air pressure instruments according to claim 1, characterized in that: The cross-section of the cap nut (9) is U-shaped.

7. The self-sealing valve for air pressure instruments according to claim 1, characterized in that: An outer ring (703) is provided at a position of the valve seat (7) close to the middle, and a plane (704) is formed on the side of the outer ring (703).

8. The self-sealing valve for air pressure instruments according to claim 1, characterized in that: A tool groove (901) is formed at the bottom of the cap nut (9).

9. The self-sealing valve for air pressure instruments according to claim 1, characterized in that: A rubber pad (8) is provided between the valve seat (7) and the cap nut (9).

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