Vacuumizing push-pull valve

Abstract

The utility model relates to a vacuumizing push-pull valve which comprises a valve body and a valve element, and the valve element is arranged in a cavity of the valve body in a sleeved mode. The top surface of the valve body is provided with an air outlet communicated with the cavity, and the side part of the valve body is provided with an exhaust pipe communicated with the cavity; an internal thread is arranged at one end, close to the air outlet, in the cavity of the valve body; the valve core comprises a plug; the side face of the plug is provided with an external thread matched with the internal thread, and the side face of the plug is further provided with a vent groove. The plug is fixed in the valve body in a mechanical mode, so that the problem of air leakage of the valve when a container or equipment vibrates in the carrying process or collision and the like can be effectively avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of push-pull valves, in particular to a vacuum push-pull valve. Background Art

[0002] Dewar flasks, vehicle-mounted LNG cylinders, liquid hydrogen cylinders, cryogenic liquid delivery pipelines and cryogenic containers with similar sealing structures require the air in the interlayer to be evacuated during use.

[0003] The push-pull valve currently used uses the atmospheric pressure of the sealing ring to press the valve core tightly against the valve body to achieve a sealing effect. The sealing method using this structure is unstable. The vibration generated during transportation may cause the valve core to loosen and leak, resulting in the failure of vacuum in each layer.

[0004] Therefore, how to prevent the leakage of the vacuum layer during container transportation is an issue that needs to be studied currently. Utility Model Content

[0005] Based on the above technical problems existing in the prior art, the utility model provides a vacuum push-pull valve, which fixes the valve core plug in the valve body by mechanical means, effectively avoiding the problem of valve leakage when the container or equipment vibrates during transportation or collision.

[0006] In order to achieve the above purpose, the technical solution of the utility model is as follows:

[0007] A vacuum push-pull valve comprises a valve body and a valve core, wherein the valve core is sleeved in the cavity of the valve body; the top surface of the valve body is provided with an air outlet connected to the cavity, and the side is provided with an exhaust pipe connected to the cavity; an internal thread is provided at one end of the cavity of the valve body close to the air outlet; the valve core comprises a plug; the side of the plug is provided with an external thread matching the internal thread, and the side of the plug is also provided with a ventilation groove.

[0008] In some embodiments, a first sealing ring is provided on the end surface of the plug facing the air outlet, and the inner diameter of the first sealing ring is larger than the diameter of the air outlet and the outer diameter is smaller than the diameter of the plug.

[0009] In some embodiments, an end surface of the plug facing the air outlet is provided with a mounting groove for mounting the first sealing ring.

[0010] In some embodiments, a plurality of the vent grooves are circumferentially spaced apart along the side surface of the plug.

[0011] In some embodiments, the valve core further includes a plug opening structure, which penetrates the bottom surface of the valve body and is used to drive the plug to rotate.

[0012] In some embodiments, the plug opening structure includes a valve stem disposed in the cavity, a connector rotatably sealed at the bottom of the cavity, and a bottom rod for controlling the plug opening structure; the valve stem, connector, and bottom rod are fixedly connected.

[0013] In some embodiments, the end surface of the plug connected to the valve stem is provided with a square groove matching the top end of the valve stem.

[0014] In some embodiments, the bottom bar has a prismatic structure.

[0015] In some embodiments, at least one annular groove is provided in the stepped hole at the lower portion of the valve body, a sealing ring is provided in the annular groove, an outer wall of the sealing ring abuts against the annular groove, and an inner wall of the sealing ring abuts against the outer wall of the connecting member.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0017] The vacuum push-pull valve provided by the utility model fixes the plug to the valve body by means of a threaded connection, which can effectively avoid the problem of vacuum leakage caused by the loosening of the valve core when the container or equipment is vibrated by external forces such as transportation or collision, and has good sealing and strong stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The features and advantages of the present invention will be more clearly understood by referring to the accompanying drawings, which are schematic and should not be construed as limiting the present invention in any way. In the accompanying drawings:

[0019] Figure 1 This is an overall assembly structure diagram of the vacuum push-pull valve of Example 1 of the present utility model;

[0020] Figure 2 This is a schematic diagram of the gas flow direction when the vacuum push-pull valve of Example 1 of the present utility model is evacuated;

[0021] Figure 3 Schematic diagram of the plug structure;

[0022] Figure 4 This is another structural diagram of the plug;

[0023] In the figure: 1-valve body, 11-air outlet, 12-exhaust pipe, 2-valve core, 21-plug, 211-venting groove, 212-installation groove, 22-plug opening structure, 221-valve stem, 222-connecting piece, 223-bottom rod. DETAILED DESCRIPTION

[0024] The following embodiments are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0025] Example 1

[0026] like Figure 1 As shown, a vacuum push-pull valve includes a valve body 1 and a valve core 2, and the valve core 2 is arranged in the cavity of the valve body 1; the top surface of the valve body 1 is provided with an air outlet 11 connected to the cavity, and the side is provided with an exhaust pipe 12 connected to the cavity; the cavity of the valve body 1 is provided with an internal thread at one end close to the air outlet 11; the valve core 2 includes a plug 21; the side of the plug 21 is provided with an external thread matching the internal thread, and the side of the plug 21 is also provided with a ventilation groove 211.

[0027] Taking the specific implementation of this embodiment as an example, Figure 2 As shown, when it is necessary to vacuum the container or equipment, the plug 21 is rotated counterclockwise away from the air outlet 11, and a gap is formed between the plug 21 and the upper surface of the cavity of the valve body 1. The gas outlet 11 in the container is discharged out of the container or equipment through the vent groove 211 and the exhaust pipe 12.

[0028] It should be noted that the structure of the present invention realizes the sealing or ventilation of the push-pull valve by whether there is a gap between the end face of the plug 21 facing the air outlet 11 and the upper surface of the cavity of the valve body 1. When the end face of the plug 21 facing the air outlet 11 is tightly fitted with the upper surface of the cavity, the push-pull valve is sealed; when there is a gap between the end face of the plug 21 facing the air outlet 11 and the upper surface of the cavity, the push-pull valve can be ventilated.

[0029] In order to improve the sealing performance of the push-pull valve, the plug 21 is made to fit more closely with the upper surface of the cavity, such as Figure 3 As shown, a first sealing ring (not shown) is provided on the end face of the plug 21 facing the gas outlet 11. The inner diameter of the first sealing ring is larger than the diameter of the gas outlet, and the outer diameter is smaller than the diameter of the plug 21. Furthermore, a mounting groove 212 is provided on the end face of the plug 21 facing the gas outlet 11 for concealing the first sealing ring, thereby securing the first sealing ring to the plug 21 and preventing the sealing ring from moving during use, which could result in an unsatisfactory sealing effect.

[0030] Furthermore, a plurality of vent grooves 211 are designed to be spaced circumferentially along the side surface of the plug 21 , which can make vacuuming more efficient.

[0031] Furthermore, the valve core 2 of the push-pull valve of this embodiment further includes a plug opening structure 22 , which passes through the bottom surface of the valve body 1 and is used to drive the plug 21 to rotate.

[0032] Specifically, the plug opening structure 22 includes a valve stem 221 arranged in the cavity, a connecting piece 222 rotatably sealed at the bottom of the cavity, and a bottom rod 223 for controlling the plug opening structure 22; the valve stem 221, the connecting piece 222 and the bottom rod 223 are fixedly connected.

[0033] Furthermore, if Figure 4 The end surface where the plug 21 is connected to the valve stem 221 is provided with a square groove 213 that matches the top of the valve stem 221, which facilitates the rotation of the plug 21 through the plug opening structure 22; the bottom rod 223 is a prismatic structure, and the plug opening structure 22 can be easily operated by tools.

[0034] Furthermore, at least one annular groove 13 is provided at the lower part of the cavity of the valve body 1, and a second sealing ring is provided in the annular groove 13. The outer wall of the second sealing ring presses against the annular groove 13, and the inner wall presses against the outer wall of the connecting piece 222, so that the plug opening structure 22 can be fixedly connected to the valve body 1, thereby preventing the plug opening structure 22 from loosening and falling or being lost.

[0035] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the embodiments of the present invention are described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A vacuum push-pull valve, characterized in that: The invention comprises a valve body (1) and a valve core (2), wherein the valve core (2) is sleeved in the cavity of the valve body (1); the top surface of the valve body (1) is provided with an air outlet (11) connected to the cavity, and the side portion is provided with an air extraction pipe (12) connected to the cavity; an internal thread is provided at one end of the cavity of the valve body (1) close to the air outlet (11); the valve core (2) comprises a plug (21); the side surface of the plug (21) is provided with an external thread matching the internal thread, and the side surface of the plug (21) is also provided with a ventilation groove (211).

2. The vacuum push-pull valve according to claim 1, characterized in that: A first sealing ring is provided on the end surface of the plug (21) facing the air outlet (11), wherein the inner diameter of the first sealing ring is larger than the diameter of the air outlet and the outer diameter is smaller than the diameter of the plug (21).

3. The vacuum push-pull valve according to claim 2, characterized in that: An end surface of the plug (21) facing the air outlet (11) is provided with a mounting groove (212) for mounting the first sealing ring.

4. The vacuum push-pull valve according to claim 1, characterized in that: A plurality of the vent grooves (211) are arranged at intervals along the circumferential side of the plug (21).

5. The vacuum push-pull valve according to claim 1, characterized in that: The valve core (2) further comprises a plug opening structure (22), wherein the plug opening structure (22) penetrates the bottom surface of the valve body (1) and is used to drive the plug (21) to rotate.

6. The vacuum push-pull valve according to claim 5, characterized in that: The plug opening structure (22) comprises a valve stem (221) arranged in a cavity, a connecting piece (222) rotatably sealed at the bottom of the cavity, and a bottom rod (223) for controlling the plug opening structure (22); the valve stem (221), the connecting piece (222) and the bottom rod (223) are fixedly connected.

7. The vacuum push-pull valve according to claim 6, characterized in that: The end surface of the plug (21) connected to the valve stem (221) is provided with a square groove (213) matching the top end of the valve stem (221).

8. The vacuum push-pull valve according to claim 6, characterized in that: The bottom rod (223) is in a prismatic structure.

9. The vacuum push-pull valve according to any one of claims 1 to 8, characterized in that: At least one annular groove (13) is provided at the lower portion of the cavity of the valve body (1), a sealing ring is provided in the annular groove (13), the outer wall of the sealing ring abuts against the annular groove (13), and the inner wall abuts against the outer wall of the connecting member (222).

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