Gas sampling bag one-way valve

Abstract

According to the gas sampling bag one-way valve, the problems that an existing gas sampling bag switching valve is inconvenient to operate, and gas leakage occurs due to misoperation are solved, the film elastic piece and the pressing ring are arranged in the valve body of the gas sampling bag one-way valve, and the one-way valve body is connected with the fastener; the sealing gasket and the sampling bag film are pressed between the one-way valve main body and the fastener, and the film elastic sheet controls the airflow to flow unidirectionally, so that the gas can only enter the sampling bag unidirectionally, the operation steps of gas sampling are simplified, and the gas leakage caused by misoperation is reduced.

Description

Technical Field

[0001] The utility model relates to a one-way valve for a gas sampling bag. Background Art

[0002] The switch valve used on the currently known gas sampling bag is usually composed of a valve body, a fastener, a switch knob, and a sealing gasket. The fastener passes through the sampling bag film hole, then puts on the sealing gasket, and then connects to the valve body, and presses the sealing gasket and the film between the valve body and the fastener. The switch knob is used to control the opening and closing of the valve. When the valve is open, the gas sampling bag can be inflated. After the inflation is completed, the switch knob is closed. When the valve is closed, the gas in the gas sampling bag is stored in the bag without leakage, and the sampling bag cannot be inflated. In some industries such as medical exhalation bags, after the subject exhales, the subject is asked to close the valve. There may be misoperation, the valve is not closed, resulting in leakage, and the exhalation sampling fails; or medical personnel are required to assist the subject to operate the valve to close, which brings more workload to medical workers. Summary of the invention

[0003] In order to overcome the problem that the existing gas sampling bag switch valve is inconvenient to operate, the present invention provides a gas sampling bag one-way valve, the one-way valve body has a built-in film spring and a pressure ring, the one-way valve body is connected to the fastener, the sealing gasket and the sampling bag film are pressed between the one-way valve body and the fastener, the film spring controls the one-way flow of the airflow, so that the gas can only enter the sampling bag in one direction.

[0004] The technical solution adopted by the present invention to solve the technical problem is: the one-way valve of the gas sampling bag is composed of a valve body, a fastener, a film spring, a pressure ring, and a sealing gasket, and the materials of the first two components can be metal or plastic materials.

[0005] There is a through hole as an air guide hole at the center line of the valve body. The film spring and the pressure ring are installed into the valve body from the end where the valve body is connected to the fastener. After the valve body is installed, the fastener passes through the film hole of the sampling bag, and the sealing gasket is put on. One end of the valve body is connected to the fastener, and the sealing gasket and the sampling bag film are pressed between the valve body and the fastener.

[0006] When inflated, the gap of the film spring is opened, and the air flow can enter the bag; the pressure ring only presses the film spring to fit it to the step surface of the through hole of the valve body, but the inner diameter of the pressure ring cannot prevent the gap of the film spring from being expanded; in the non-inflated state, the gap of the film spring is reset, and the film spring fits to the step surface of the through hole of the valve body, and the film spring blocks the through hole of the valve body. The gap of the film spring is outside the edge of the through hole of the valve body. The outside of the gas sampling bag is under pressure, and the film spring is closer to the through hole of the valve body, thereby closing the through hole of the valve body for ventilation.

[0007] The film spring and the pressure ring can be made of materials such as fluoroplastics or fluororubber, the valve body and fasteners can also be made of fluoroplastics or metals, and the film of the gas sampling bag also uses fluoroplastic film. The sampling bag made in this way can achieve low organic volatile matter release and meet the collection and storage of low organic volatile gas samples or the collection and storage of corrosive gases.

[0008] The beneficial effects of the utility model are that the improvement of the valve of the gas sampling bag solves the problems of inconvenient gas collection and leakage due to operation errors in the gas sampling bag, simplifies the operation steps of gas sampling, and reduces the advantages of leakage due to operation errors. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is a cross-sectional schematic diagram of the main body of the one-way valve of the gas sampling bag of the utility model.

[0010] Figure 2 The utility model is a cross-sectional schematic diagram of a one-way fastener of a gas sampling bag.

[0011] Figure 3 The utility model is a cross-sectional schematic diagram of a thin film spring of a one-way valve of a gas sampling bag.

[0012] Figure 4 The utility model is a cross-sectional schematic diagram of a one-way valve pressure ring of a gas sampling bag. DETAILED DESCRIPTION

[0013] like Figure 1 As shown, the valve body 400 of the gas sampling bag check valve has a certain slope at the opening of the pressing end 401, so that the raised ring 201 on the fastener can slide into the inner groove 402 of the valve body under a certain external force, and the size of the valve body groove 402 is consistent with the size of the raised ring 201 of the fastener 200; the valve body has an air inlet 403; the film spring 300 is installed from the end 401, and then the pressing ring 100 pushes the film spring 300 into the end face of the air inlet 403. The outer diameter and length of the air inlet of the valve body can be appropriately adjusted as needed.

[0014] Figure 2 As shown, there is a raised ring 201 on the fastener 200, which can be stuck to the groove 402 in the valve body under a certain external force. There is a through hole 202 in the center of the fastener, which serves as a gas passage. After being installed in the valve body, the through hole 202 is in line with the air inlet 403 of the valve body. The sealing gasket is located in the middle of the connection between the valve body 400 and the fastener 200, and is mainly used to press the sampling bag film to make the connection airtight. The connection method between the valve body and the fastener is not limited to the interlocking method of the groove and the raised ring, but can also be other connection methods such as threads.

[0015] Figure 3As shown, the film spring 300 is a disc-shaped thin film. The thickness is selected according to the size of the valve. The film diameter is consistent with the step diameter of the valve body through hole. The film spring has a circular arc gap 301. Under a certain external force airflow, the circular arc gap 301 opens and airflow can pass through; the radius of the circular arc gap 301 is larger than the radius of the valve body air inlet hole 403 or as long as the circular arc gap 301 is outside the hole edge of the valve body air inlet hole 403, when no airflow enters the air inlet hole 403, the circular arc gap 301 of the film spring 300 is reset, and the film spring 300 is attached to the end face of the air inlet hole to prevent the airflow in the sampling bag from flowing out.

[0016] Figure 4 As shown, the pressure ring 100 presses the film spring 300, and the inner diameter 101 of the pressure ring is larger than the radius of the arc gap 301 of the film spring. As long as the inner diameter 101 of the pressure ring does not affect the opening of the arc gap 301, that is, the arc gap 301 of the film spring is within the inner diameter 101 of the pressure ring, when air flows into the air inlet 403, the air flow breaks open the arc gap 301 of the film spring 300; the external airflow stops, the arc gap 301 resets, and the gas inside the sampling bag is prevented from flowing out, and the gas entering the sampling bag is stored in the sampling bag.

[0017] Such a valve structure is convenient and simple for gas sampling, especially for medical respiratory gas sampling. It is convenient for the exhaled gas sampling of the subject to be tested, and there will be no leakage due to the valve not being closed tightly, nor will it increase the workload of medical workers in assisting the subject to be tested to check whether the valve is closed tightly.

Claims

1. The one-way valve of the gas sampling bag is composed of a valve body, fasteners, sealing gaskets, film springs, and a pressure ring, and is characterized by: The film spring is built into the valve body through a pressure ring, and the valve body is connected to the fastener, so that the sealing gasket and the sampling bag film are pressed tightly between the valve body and the fastener.

2. The one-way valve for gas sampling bag according to claim 1, characterized in that: The film spring has an arc gap, the arc gap is outside the edge of the air inlet hole of the valve body, and the arc gap of the film spring is within the inner diameter of the pressure ring.

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