Gas cylinder valve flow restriction device

Abstract

This utility model discloses a flow-limiting device for a gas cylinder valve, belonging to the field of high-pressure gas valves. It includes a connecting pipe body, one end of which is a connecting end. An air hole is provided on the side wall of the connecting pipe body, and an adjusting cap is provided at the other end. A receiving cavity is provided on the side of the adjusting cap facing the connecting pipe body. A valve head is provided inside the receiving cavity, and an elastic element is provided between the valve head and the bottom of the receiving cavity. An overflow hole communicating with the receiving cavity is provided on the side wall of the adjusting cap. The beneficial effects of this solution are: In the initial state, the elastic element pushes the valve head to move and seal the right end of the connecting pipe body; when releasing gas from the gas cylinder, the gas is discharged through the air hole to the left end of the connecting pipe body, achieving a slow release and preventing excessive airflow from causing danger; when refilling is required, gas is injected through the left end of the connecting pipe body. Due to the small diameter of the air hole, the internal pressure of the connecting pipe body gradually increases, opening the valve head, and gas is injected through the overflow hole, increasing the instantaneous flow rate and enabling the gas cylinder to be filled quickly.

Description

Technical Field

[0001] This utility model relates to the field of high-pressure gas valves, specifically to a flow limiting device for gas cylinder valves. Background Technology

[0002] Gas cylinders, as gas storage devices, are commonly used in various modern industrial settings. Filling and releasing gas cylinders are crucial steps in their operation. High-pressure gas cylinders typically hold gas at pressures of 20 MPa, with some reaching 30 MPa, which is 300 times atmospheric pressure. If the gas release is uncontrolled, the high-pressure gas can cause cutting injuries to people and objects. Furthermore, the recoil force from the gas jet can propel the cylinder at high speed, causing further injury.

[0003] Therefore, gas cylinders need to be supplied with a small flow rate during use to ensure longer service life; however, a large flow rate is required for filling to reduce filling time. In existing technology, gas cylinder filling and degassing are both completed through the same interface, making it impossible to adjust the flow rate, which is difficult to adapt to different usage scenarios and results in low work efficiency. Utility Model Content

[0004] In view of the above-mentioned shortcomings of the existing technology, the technical problem to be solved by this utility model is: how to adjust the gas cylinder filling and discharging flow rate to ensure that the gas is released evenly and slowly when supplied, but can be filled quickly when filled.

[0005] To solve the above-mentioned technical problems, this utility model adopts the following technical solution: a gas cylinder valve flow limiting device, including a connecting pipe body, one end of which is a connecting end, and at least one air hole is provided on the side wall of the connecting pipe body near the connecting end. The other end of the connecting pipe body is provided with an adjusting cap; a receiving cavity is provided on the side of the adjusting cap facing the connecting pipe body, and the adjusting cap is sleeved on the end of the connecting pipe body through the receiving cavity and fixedly connected to the connecting pipe body; a valve head is provided in the receiving cavity, and an elastic element is provided between the valve head and the bottom of the receiving cavity; at least one overflow hole communicating with the receiving cavity is provided on the side wall of the adjusting cap at a position between the connecting pipe body and the bottom of the receiving cavity; in the initial state, the valve head closes the connecting pipe body under the action of the elastic element. When high-pressure gas enters through the connecting end of the connecting pipe body, the high-pressure gas can push the valve head to overcome the pressure of the elastic element and connect the connecting pipe body and the overflow hole.

[0006] The beneficial effects of this solution are as follows: the connecting tube is located inside the gas cylinder, and the left end of the connecting tube is connected to the outside of the gas cylinder through the gas cylinder valve; in the initial state, the elastic element pushes the valve head to move and block the right end of the connecting tube. When the gas in the gas cylinder is released, the gas is discharged through the air hole to the left end of the connecting tube, realizing a slow release and preventing the gas flow from being too large and causing danger; when it is necessary to refill, the gas is injected through the left end of the connecting tube. Due to the small diameter of the air hole, the internal pressure of the connecting tube gradually increases, opening the valve head, and the gas is injected through the overflow hole, increasing the instantaneous flow rate and enabling the gas cylinder to be filled quickly.

[0007] Preferably, the end of the valve head facing the connecting pipe is tapered.

[0008] The advantages of adopting the above preferred solution are: the valve head abuts against the end of the connecting pipe body through the conical surface, which can completely cut off the airflow and improve the sealing performance.

[0009] Preferably, the end of the valve head away from the connecting pipe body is located at least behind the overflow hole on the side closest to the connecting pipe body.

[0010] The advantage of adopting the above preferred solution is that the valve head only needs to be moved back a short distance to ensure the continuity between the connecting pipe and the overflow hole.

[0011] Preferably, the diameter of the overflow hole is larger than that of the air hole.

[0012] The advantages of adopting the above preferred scheme are: the overflow hole diameter is larger, increasing the maximum flow rate during inflation.

[0013] Preferably, the elastic element is a helical spring.

[0014] The advantages of adopting the above preferred solution are: cylindrical design, compact structure, small space occupation and light weight.

[0015] Preferably, the connecting tube and the adjusting cap are connected by a thread.

[0016] The advantages of adopting the above preferred solution are: simple structure and convenient disassembly and replacement.

[0017] Preferably, the outer diameter of the end of the connecting tube furthest from the adjusting cap is smaller than that of the other end.

[0018] The advantages of adopting the above preferred solution are: the outer diameter of the left end of the connecting pipe is reduced, making it easier to connect to the gas cylinder valve or other gas-using components. Attached Figure Description

[0019] Appendix Figure 1 This is a schematic diagram of the internal structure of this utility model; Appendix Figure 2 This is an external schematic diagram of the present invention.

[0020] Explanation of reference numerals in the attached drawings: 1. Connecting pipe; 2. Air hole; 3. Adjusting cap; 4. Receiving cavity; 5. Elastic element; 6. Valve head; 7. Overflow hole. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this utility model provided in the accompanying drawings is not intended to limit the scope of the claimed utility model, but merely represents selected embodiments of the utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

[0022] Example 1 like Figures 1 to 2 As shown, the gas cylinder valve flow limiting device includes a connecting pipe body 1, one end of which is a connecting end. At least one air hole 2 is provided on the side wall of the connecting pipe body 1 near the connecting end. An adjusting cap 3 is provided on the other end of the connecting pipe body 1. A receiving cavity 4 is provided on the side of the adjusting cap 3 facing the connecting pipe body 1. The adjusting cap 3 is sleeved on the end of the connecting pipe body 1 through the receiving cavity 4 and is fixedly connected to the connecting pipe body 1. A valve head 6 is provided in the receiving cavity 4. An elastic element 5 is provided between the valve head 6 and the bottom of the receiving cavity 4. At least one overflow hole 7 communicating with the receiving cavity 4 is provided on the side wall of the adjusting cap 3 at a position between the connecting pipe body 1 and the bottom of the receiving cavity 4. In the initial state, the valve head 6 closes the connecting pipe body 1 under the action of the elastic element 5. When high-pressure gas enters through the connecting end of the connecting pipe body 1, the high-pressure gas can push the valve head 6 to overcome the pressure of the elastic element 5 and connect the connecting pipe body 1 and the overflow hole 7.

[0023] In this embodiment, the connecting tube 1 is placed inside the cylinder valve rod, and then the cylinder valve rod is inserted into the cylinder. The connecting tube 1 is located inside the cylinder. The left end of the connecting tube 1 is the connecting end, which is connected to the outside of the cylinder through the cylinder valve. The air hole 2 and the overflow hole 7 are both connected to the inside of the cylinder.

[0024] In the initial state, the elastic element 5 pushes the valve head 6 to block the right end of the connecting tube 1; at this time, if gas needs to be released, the gas in the gas cylinder can only enter the connecting tube 1 through the gas hole 2, and then flow out from the connecting end of the connecting tube 1, so as to achieve uniform and slow gas release and prevent excessive gas flow from causing danger. When the gas in the cylinder runs out and needs to be refilled, an external high-pressure gas source is connected to the connection end of the connecting pipe 1. After the gas enters the connecting pipe 1, it flows into the gas cylinder through the air hole 2. Because the diameter of the air hole 2 is small, it cannot completely pass through the large flow of high-pressure gas, causing the internal pressure of the connecting pipe 1 to increase until the gas pressure pushes the valve head 6 to move to the right, connecting the right end of the connecting pipe 1 with the overflow hole 7. Some of the high-pressure gas flows into the gas cylinder through the overflow hole 7, increasing the instantaneous flow rate and quickly filling the gas cylinder. As the high-pressure gas cylinder gradually fills up, the internal gas pressure increases. The internal gas pressure, together with the elastic element 5, pushes the valve head 6 to seal the right side of the connecting pipe 1 again.

[0025] Based on this embodiment, there are four air holes 2 and four overflow holes 7, which are evenly distributed around the central axis of the connecting pipe 1 and the adjusting cap 3.

[0026] like Figure 1 As shown, the end of the valve head 6 facing the connecting pipe body 1 is tapered.

[0027] In this embodiment, the left end of the valve head 6 is a conical surface, and the tip of the cone can be inserted into the connecting pipe. The conical surface abuts against the circumference of the end, completely cutting off the airflow and providing better sealing performance. The right end of the valve head 6 is also provided with a guide post, and the elastic element 5 is sleeved on the guide post, which has a guiding function and prevents the elastic element 5 from shifting when it extends or retracts.

[0028] As a parallel technical solution in this embodiment, the left end of the valve head 6 can also be spherical or other shapes.

[0029] like Figure 1 As shown, the end of the valve head 6 away from the connecting pipe body 1 is located at least behind the overflow hole 7 on the side close to the connecting pipe body 1.

[0030] In this embodiment, if the valve head 6 is too thick or the overflow hole 7 is too far to the right, the outer peripheral wall of the valve head 6 may completely block the overflow hole 7 in the initial state. When it is necessary to connect the overflow hole 7, the valve head 6 needs to move a long distance to the right to connect the overflow hole 7 and the connecting pipe 1. Therefore, by reducing the thickness of the valve head 6 and positioning the right end face of the valve head 6 between the left and right side walls of the overflow hole 7, the effect is that when the valve head 6 is pushed open to the right, it only needs to move a small distance backward to ensure the continuity between the connecting pipe 1 and the overflow hole 7.

[0031] like Figure 1 As shown, the diameter of the overflow hole 7 is larger than that of the air hole 2.

[0032] In this embodiment, the overflow orifice has a larger diameter, increasing the maximum flow rate during inflation.

[0033] like Figure 1 As shown, the elastic element 5 is a helical spring.

[0034] In this embodiment, the helical spring has a cylindrical design, which is compact, occupies little space, and is lightweight.

[0035] like Figure 1 As shown, the connecting tube 1 and the adjusting cap 3 are connected by a thread.

[0036] In this embodiment, the threaded connection structure is simple and easy to disassemble and replace; and by turning the thread, the relative distance between the end face of the connecting tube 1 and the receiving cavity 4 can be changed, thereby adjusting the initial compression state of the elastic element 5.

[0037] like Figure 1 As shown, the outer diameter of the end of the connecting tube 1 furthest from the adjusting cap 3 is smaller than that of the other end.

[0038] In this embodiment, the outer diameter of the left end of the connecting pipe is reduced, making it easier to connect to the gas cylinder valve or other gas-using components.

[0039] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model and not to limit the technical solutions. Those skilled in the art should understand that any modifications or equivalent substitutions to the technical solutions of this utility model that do not depart from the spirit and scope of this technical solution should be covered within the scope of the claims of this utility model.

Claims

1. A gas cylinder valve flow limiting device, characterized in that, It includes a connecting pipe body (1), one end of which is a connecting end. At least one air hole (2) is provided on the side wall of the connecting pipe body near the connecting end. An adjusting cap (3) is provided on the other end of the connecting pipe body (1). A receiving cavity (4) is provided on the side of the adjusting cap (3) facing the connecting pipe body (1). The adjusting cap (3) is sleeved on the end of the connecting pipe body (1) through the receiving cavity (4) and fixedly connected to the connecting pipe body (1). A valve head (6) is provided in the receiving cavity (4). 4) An elastic element (5) is provided between the bottoms; On the side wall of the adjusting cap (3), at least one overflow hole (7) connecting the receiving cavity (4) is provided at the position between the bottom of the connecting tube (1) and the receiving cavity (4); In the initial state, under the action of the elastic element (5), the valve head (6) closes the connecting tube (1). When the high pressure gas enters through the connecting end of the connecting tube (1), the high pressure gas can push the valve head (6) to overcome the pressure of the elastic element (5) and connect the connecting tube (1) and the overflow hole (7).

2. The gas cylinder valve flow limiting device according to claim 1, characterized in that, The valve head (6) is tapered at the end facing the connecting pipe (1).

3. The gas cylinder valve flow limiting device according to claim 2, characterized in that, The end of the valve head (6) away from the connecting pipe body (1) is located at least behind the overflow hole (7) on the side close to the connecting pipe body (1).

4. The gas cylinder valve flow limiting device according to claim 1, characterized in that, The diameter of the overflow hole (7) is larger than that of the air hole (2).

5. The gas cylinder valve flow limiting device according to claim 1, characterized in that, The elastic element (5) is a helical spring.

6. The gas cylinder valve flow limiting device according to claim 1, characterized in that, The connecting tube (1) and the adjusting cap (3) are connected by a thread.

7. The gas cylinder valve flow limiting device according to any one of claims 1 to 6, characterized in that, The outer diameter of the end of the connecting tube (1) away from the adjusting cap (3) is smaller than that of the other end.

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