Gas sampling bag valve

Abstract

The utility model belongs to the field of medical equipment, and provides a gas sampling bag valve which comprises a main body, a valve core and a fastener, the interior of the main body is of a hollow tubular structure with upper and lower openings, and internal threads are arranged on the inner wall of the lower part of the main body; the valve element is of a hollow structure, the upper portion of the valve element is an air nozzle pipe, and a protrusion is arranged in the middle of the valve element. A groove is formed in the lower part of the bulge; a first external thread is arranged on the periphery of the lower portion of the valve element. The shape of the top end of the fastening piece is matched with the shape of the hollow structure in the lower part of the valve core, and the lower part of the top end of the fastening piece is provided with a vent hole communicated with an air passage arranged in the fastening piece; and a second external thread is arranged on the periphery of the lower part of the fastener. The gas sampling bag valve provided by the utility model has the advantages that the structure is simplified, the production efficiency of the valve is greatly improved, the failure rate is reduced, the use is convenient, the working efficiency is improved, and the problem that sample gas collected in the gas sampling bag is polluted by sealing rings such as rubber and the like is also avoided.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of medical equipment, especially relates to a gas sampling bag valve. BACKGROUND

[0002] The valve used on the existing gas sampling bag is usually composed of a valve body, a valve switch knob, a fastener and a sealing gasket. The fastener is connected to the valve body by threads, the valve body is internally threaded, the fastener is externally threaded, the fastener passes through a hole in the film of the sampling bag, the sealing gasket is placed on the fastener, and the valve body is tightly screwed to the fastener to ensure that the connection between the valve body and the fastener is sealed, so that the connection between the valve and the film is airtight. In addition to the external threads for connecting to the valve body, the fastener also has internal threads, the valve core has external threads, and the valve core is installed in the internal threads of the fastener. By rotating the valve core clockwise, the gasket at the top of the valve core is pressed against the air outlet of the fastener to close the valve. By rotating the valve core counterclockwise, the gasket at the top of the valve core is loosened, and the air outlet of the fastener is also loosened. The valve of this structure has two problems: first, the gas is in full contact with the rubber sealing gasket, which emits organic matter to affect the analysis of the gas, especially for the analysis of low-concentration organic volatile matter. Second, the fastener has both internal threads and external threads, which leads to low production efficiency. SUMMARY

[0003] To solve at least one of the above problems in the prior art, the utility model provides a gas sampling bag valve, which comprises a body, a valve core and a fastener, wherein:

[0004] The inside of the body is a hollow tubular structure with openings at the top and bottom. The diameter of the upper part of the hollow tubular structure is smaller than that of the lower part. The lower part of the body has internal threads on its inner wall.

[0005] The inside of the valve core is hollow. The upper part of the valve core is a gas nozzle pipe. The gas nozzle pipe passes through the upper part of the hollow tubular structure of the body. A ring of protrusions is provided on the periphery of the middle part of the valve core near the gas nozzle pipe. The diameter of the protrusions is greater than that of the upper part of the hollow tubular structure of the body. The lower part of the protrusions is provided with a groove for installing a sealing ring. The lower periphery of the valve core is provided with a first external thread that matches the internal threads on the inner wall of the lower part of the body.

[0006] The shape of the top end of the fastener matches the shape of the hollow structure inside the lower part of the valve core. The top end of the fastener is provided with an air hole. The air hole is in communication with the air passage inside the fastener. The lower periphery of the fastener is provided with a second external thread that matches the internal threads on the inner wall of the lower part of the body.

[0007] Preferably, the length of the air nozzle tube is greater than the length of the upper portion of the hollow tubular structure of the main body.

[0008] Preferably, two, three or more grooves are provided along the longitudinal direction of the valve core; and a sealing ring is provided in each of the grooves.

[0009] Preferably, a smooth cylindrical surface is provided between the groove and the first external thread.

[0010] Preferably, the hollow structure in the lower portion of the valve core is in a shape with a small opening at the upper end and a large opening at the lower end.

[0011] Preferably, the hollow structure in the lower portion of the valve core is trumpet-shaped.

[0012] Preferably, the vent hole at the lower portion of the top end of the fastener is provided along the side wall of the fastener.

[0013] Preferably, the top end of the fastener is a solid structure, or a hollow structure without an opening on the periphery.

[0014] Preferably, a sealing gasket is further provided at the lower end of the second external thread.

[0015] The utility model also provides a gas sampling bag, which includes any one of the gas sampling bag valves described above.

[0016] The gas sampling bag valve provided by the utility model simplifies the structure by arranging external threads on the valve core and the fastener, and sharing the internal threads arranged in the valve body, which can greatly improve the production efficiency of the valve, reduce the failure rate, and is easy to use, thereby improving work efficiency. By utilizing the matching structure between the opening at the bottom of the valve core and the top of the fastener, a good sealing effect can be achieved even without using a sealing ring, solving the problem of contamination of gas samples caused by the common use of rubber gaskets for sealing in existing valves, and avoiding the problem of contamination of sample gas collected in the gas sampling bag by sealing rings such as rubber. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic cross-sectional structural diagram of the valve body of the gas sampling bag valve provided by the utility model.

[0018] Figure 2 The utility model is a schematic diagram of the cross-sectional structure of the valve core of the gas sampling bag valve provided by the utility model.

[0019] Figure 3 The utility model is a schematic diagram of the cross-sectional structure of the fastener of the gas sampling bag valve provided by the present invention.

[0020] The reference numerals in the figures are described as follows:

[0021] 10-main body, 11-main body upper part, 12-main body lower part, 13-internal thread, 20-valve core, 21-air nozzle, 22-protrusion, 23-groove, 24-first external thread, 30-fastener, 31-vent, 32-air channel, 33-second external thread. DETAILED DESCRIPTION

[0022] In order to make the technical solutions, objectives and advantages of the present invention more clear, the present invention is further described in detail below through specific implementation examples and in conjunction with the accompanying drawings. It should be understood that the specific implementation examples described herein are only used to illustrate and explain the present invention and are not intended to limit the present invention.

[0023] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating positions or relationships, are based on the positions or relationships shown in the accompanying drawings and are intended solely to facilitate the description of this utility model and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0024] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to internal connections between two components. In the field of electricity and communications, they can refer to wired connections or wireless connections. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0025] like Figure 1-3 As shown, an embodiment of the present invention provides a gas sampling bag valve, comprising a main body 10 , a valve core 20 and a fastener 30 .

[0026] like Figure 1 As shown, the valve body 10 is a hollow tubular structure with openings at both the top and bottom. The diameter of the upper portion 11 of the hollow tubular structure is smaller than the diameter of the lower portion 12 of the hollow tubular structure. The lower portion 12 of the hollow tubular structure has an internal thread 13 on its inner wall.

[0027] like Figure 2As shown, the interior of the valve core 20 is a hollow structure for gas to pass through. The upper part of the valve core 20 is a nozzle tube 21. The nozzle tube 21 can pass through the upper part 11 of the hollow tubular structure of the main body 10. A circle of protrusions 22 is provided on the periphery of the middle part of the valve core 20, near the nozzle tube 21. The diameter of the protrusion 22 is larger than the diameter of the upper part 11 of the hollow tubular structure of the main body 10, thereby preventing the valve core 20 from passing through the entire hollow tubular structure of the main body 10, so that only the nozzle tube 21 is allowed to pass through the upper part 11 of the hollow tubular structure of the main body 10. The length of the nozzle tube 21 is greater than the length of the upper part 11 of the hollow tubular structure of the main body 10, so that a portion of the upper part of the nozzle tube 21 is exposed outside the upper opening of the main body 10, so as to facilitate the collection of the gas to be collected.

[0028] A groove 23 is provided below the protrusion 22. Groove 23 is used to accommodate a sealing ring. When the valve core 20 is inserted into the hollow tubular structure of the main body 10, the sealing ring installed in groove 23 closely contacts the inner wall of the upper end of the lower portion 12 of the hollow tubular structure of the main body 10, where the internal threads 13 are not provided, thereby preventing gas leakage. In a preferred embodiment, two, three, or more grooves 23 can be provided along the longitudinal direction of the valve core 20, and a sealing ring can be provided in each groove, thereby enhancing airtightness and reducing the possibility of gas leakage.

[0029] The lower periphery of the valve core 20 is provided with a first external thread 24. The first external thread 24 matches the internal thread 13 provided on the lower inner wall of the main body 10 of the valve.

[0030] Preferably, a smooth cylindrical surface can be provided between the groove 23 and the first external thread 24 to prevent the sealing ring installed in the groove 23 from sliding into the first external thread 24, thereby causing the sealing effect of the sealing ring to fail and causing gas leakage.

[0031] The hollow structure in the lower portion of the valve core 20 has a shape with a small opening at the upper end and a large opening at the lower end, for example, it may be in the shape of a trumpet.

[0032] In actual use, the valve core 20 can be inserted from the main body lower portion 12 of the main body 10 of the valve, and the air nozzle 21 can be passed through the main body upper portion 11 of the hollow tubular structure of the main body 10; when the first external thread 24 contacts the internal thread 13, the valve core 20 is rotated so that the first external thread 24 engages with the internal thread 13, and the valve core 20 is further controlled to continue to move upward. When the protrusion 22 hits the bottom of the main body upper portion 11 of the hollow tubular structure of the main body 10, the air nozzle 21 will not be able to move upward any further (to Figure 1 or Figure 2the sealing ring installed in the groove 23 is in close contact with the inner wall of the portion 13 of the upper end of the hollow tubular structure of the main body 10 at the lower portion 12 of the main body, which is not provided with an internal thread, thereby avoiding gas leakage.

[0033] like Figure 3 As shown, the top of the fastener 30 matches the shape of the hollow structure in the lower portion of the valve core 20, allowing the top of the fastener 30 to be inserted into the lower portion of the valve core 20, thereby sealing the opening in the lower portion of the valve core 20. The top of the fastener 30 can be a solid structure or a hollow structure with no outer opening, as long as it can tightly engage with the lower portion of the valve core 20 to seal the opening in the lower portion of the valve core 20.

[0034] like Figure 3 As shown, a vent hole 31 is provided at the lower portion of the top of the fastener 30. The vent hole 31 is provided along the side wall of the fastener 30, and the opening faces the side wall of the fastener 30 ( Figure 3 (left and right directions in the figure). The vent hole 31 communicates with an air passage 32 provided within the fastener 30. A second external thread 33 is provided on the lower periphery of the fastener 30. This second external thread 33 mates with the internal thread 13 provided on the lower inner wall of the valve body 10. A sealing washer may also be provided at the lower end of the second external thread 33.

[0035] A gas sampling bag using the gas sampling bag valve provided by the above-mentioned utility model also falls within the protection scope of the utility model.

[0036] When the gas sampling bag valve or gas sampling bag provided by the present invention is actually used, the lower portion of the fastener 30 ( Figure 3 33 ) is pre-buried in the opening of the gas sampling bag, and the rest of the fastener 30 extends from the opening of the gas sampling bag; then the valve core 20 is inserted from the lower part 12 of the main body 10 of the valve, so that the nozzle tube 21 passes through the hollow tubular structure of the main body 10. When the first external thread 24 contacts the internal thread 13, the valve core 20 is rotated so that the valve core 20 continues to move upward. When the protrusion 22 hits the bottom of the upper part 11 of the hollow tubular structure of the main body 10, the nozzle tube 21 can no longer move upward; then a sealing gasket is placed between the lower end of the second external thread 33 and the lower part of the fastener 30 ( Figure 3The fastener 30 is inserted from the lower part 12 of the main body 10 of the valve so that the second external thread 33 contacts and engages with the internal thread 13. Then, the main body 10 of the valve is rotated (or the fastener 30 is rotated) so that the fastener 30 moves upward along the internal thread 13 until the bottom of the main body 10 contacts the lower part of the fastener 30, thereby tightly pressing the sealing gasket. At this time, the valve core can be manually rotated to The valve core 20 is positioned within the main body 10 by adjusting the nozzle tube 21. When the lower portion of the valve core 20 is in close contact with the top of the fastener 30, the top of the fastener 30 seals the valve core's air passage. When gas needs to be collected or released from the gas sampling bag, the valve core 20 can be manually rotated by the nozzle tube 21, causing the valve core 20 to move upward, further releasing the lower portion of the valve core 20 from contact with the top of the fastener 30, allowing gas to enter or exit through the air passage of the nozzle tube 21 of the valve core 20. As can be seen from the above, gas only contacts the small end surfaces of the sealing ring provided in the groove 23 of the valve core 20 and the sealing gasket provided at the lower end of the second external thread 33. Furthermore, the sealing ring and the sealing gasket attachment are provided with a threaded structure, further reducing gas movement and convection around the sealing ring and the sealing gasket. This effectively solves the problem of volatile gases from rubber products contaminating the collected gas sample, which is often caused by the use of rubber gaskets for sealing in the prior art (the entire rubber gasket is in contact with the gas, resulting in a very large contact area).

[0037] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A gas sampling bag valve, characterized in that: The gas sampling bag valve includes a main body, a valve core, and fasteners, wherein: The interior of the main body is a hollow tubular structure with openings at the top and bottom. The diameter of the upper portion of the main body of the hollow tubular structure is smaller than the diameter of the lower portion of the main body of the hollow tubular structure. An internal thread is provided on the inner wall of the lower portion of the main body. The interior of the valve core is a hollow structure; the upper part of the valve core is an air nozzle; the air nozzle passes through the upper part of the hollow tubular structure of the main body; a circle of protrusions is provided on the periphery of the middle part of the valve core, near the air nozzle; the diameter of the protrusion is larger than the diameter of the upper part of the hollow tubular structure of the main body; the lower part of the protrusion is provided with a groove; the groove is used to install a sealing ring; the outer periphery of the lower part of the valve core is provided with a first external thread; the first external thread matches the internal thread provided on the inner wall of the lower part of the main body; The outer shape of the top end of the fastener matches the shape of the hollow structure in the lower part of the valve core; a vent is provided at the lower part of the top end of the fastener; the vent is communicated with the air channel provided inside the fastener; a second external thread is provided at the outer periphery of the lower part of the fastener; the second external thread matches the internal thread provided on the inner wall of the lower part of the main body.

2. The gas sampling bag valve according to claim 1, characterized in that: The length of the air nozzle tube is greater than the length of the upper portion of the hollow tubular structure of the main body.

3. The gas sampling bag valve according to claim 2, characterized in that: Two, three or more grooves are provided along the longitudinal direction of the valve core; and a sealing ring is provided in each groove.

4. The gas sampling bag valve according to claim 3, characterized in that: A smooth cylindrical surface is provided between the groove and the first external thread.

5. The gas sampling bag valve according to claim 4, characterized in that: The hollow structure in the lower portion of the valve core is in a shape with a small opening at the upper end and a large opening at the lower end.

6. The gas sampling bag valve according to claim 5, characterized in that: The hollow structure in the lower part of the valve core is trumpet-shaped.

7. The gas sampling bag valve according to claim 6, characterized in that: The vent hole at the lower portion of the top end of the fastener is arranged along the side wall of the fastener.

8. The gas sampling bag valve according to claim 7, characterized in that: The top end of the fastener is a solid structure, or a hollow structure without an opening on the periphery.

9. The gas sampling bag valve according to claim 1, characterized in that: A sealing gasket is also provided at the lower end of the second external thread.

10. A gas sampling bag, characterized in that: The gas sampling bag comprises the gas sampling bag valve according to any one of claims 1 to 9.

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