Gas self-closing valve with flow limiting mechanism

Abstract

The utility model discloses a gas self-closing valve with a flow limiting mechanism. The gas self-closing valve comprises a valve body and a moving mechanism, a flow limiting cylinder is arranged in the valve body, the lower end of the flow limiting cylinder is communicated with an air inlet of the valve body, a flow limiting hole is formed in the upper end of the flow limiting cylinder, a sliding column is slidably connected into the flow limiting hole, an upper self-closing baffle is arranged at the upper end of the sliding column, a lower self-closing baffle is arranged at the lower end of the sliding column, and a conical flow limiting ring is arranged on the outer arc face of the sliding column. The conical flow limiting ring is matched with the flow limiting hole; the moving mechanism is arranged at the upper end of the valve body and fixedly connected with the upper self-closing baffle, the moving mechanism comprises a connecting disc and an elastic membrane, and the connecting disc is arranged on the upper surface of the upper self-closing baffle. The gas flow in the gas self-closing valve is automatically limited, the influence of pressure change on the gas flow is reduced, and gas conveying is more stable.

Description

Technical Field

[0001] The utility model relates to the technical field of gas self-closing valves, in particular to a gas self-closing valve with a flow limiting mechanism. Background Art

[0002] The gas self-closing valve is an automatic closing valve installed on the pipeline of the low-pressure gas system. It can automatically close when the gas supply pressure is abnormal and needs to be manually reopened. This valve does not require electricity or other external power. It is an indoor safety device designed to prevent gas leaks and other potential safety problems. The gas self-closing valve is usually installed between the end of the pipeline behind the gas meter and the stove connection hose to ensure that the valve can automatically close in the event of gas leakage, low or high pressure, abnormal flow, etc. in the gas pipeline, thereby protecting personal and property safety. In addition, the gas self-closing valve also has the functions of automatic closing when over-current occurs, automatic closing when gas is stopped, automatic closing when under-pressure occurs, and automatic closing when over-pressure occurs, which can effectively deal with various safety hazards; in the prior art, the authorization announcement number is CN 218267482 U discloses a self-closing valve for a gas pipeline, comprising a shell, a power mechanism installed in the shell, an air inlet pipe fixedly connected to the front circumferential surface of the shell, a flow cut-off mechanism and a flow limiting mechanism installed in the air inlet pipe, and the flow cut-off mechanism is connected to the power mechanism through a connecting rod; an air outlet pipe is fixedly connected to the rear circumferential surface of the shell, and a connecting mechanism is installed on the circumferential surface of the air outlet pipe. Although the gas flow can be automatically blocked when an abnormal situation occurs, when the gas pressure does not exceed the safety range, although the gas pressure changes, the self-closing valve will not work, and the change in pressure will affect the flow of gas, thereby reducing the stability of gas transportation. Utility Model Content

[0003] The technical problem to be solved by the utility model is to overcome the existing defects and provide a gas self-closing valve with a flow limiting mechanism. By accurately adjusting the cross-sectional area of ​​the gas flow in the gas self-closing valve, the influence of pressure changes on the gas flow rate is reduced, and the gas delivery is made more stable, which can effectively solve the problems in the background technology.

[0004] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a gas self-closing valve with a flow limiting mechanism, comprising a valve body and a moving mechanism;

[0005] Valve body: a flow limiting cylinder is arranged inside the valve body, the lower end of the flow limiting cylinder is connected with the air inlet of the valve body, a flow limiting hole is arranged at the upper end of the flow limiting cylinder, a sliding column is slidably connected inside the flow limiting hole, an upper self-closing baffle is arranged at the upper end of the sliding column, a lower self-closing baffle is arranged at the lower end of the sliding column, a conical flow limiting ring is arranged on the outer arc surface of the sliding column, and the conical flow limiting ring is installed in coordination with the flow limiting hole;

[0006] Moving mechanism: It is arranged at the upper end of the valve body. The moving mechanism is fixedly connected to the upper self-closing baffle. By accurately adjusting the cross-sectional area of ​​the gas flow in the gas self-closing valve, the flow rate of the gas in the gas self-closing valve is automatically limited, the influence of pressure changes on the gas flow rate is reduced, and the gas delivery is made more stable.

[0007] Furthermore, the moving mechanism includes a connecting disk and an elastic diaphragm. The connecting disk is arranged on the upper surface of the upper self-closing baffle. An elastic diaphragm is provided between the outer arc surface of the connecting disk and the inner wall of the valve body, and the change of gas pressure is used to drive the upper self-closing baffle to move up and down.

[0008] Furthermore, the moving mechanism also includes a lifting rod, which is installed on the upper surface of the connecting plate. The lifting rod is vertically slidably connected to the sliding hole at the upper end of the valve body, so as to facilitate manual lifting of the connecting plate.

[0009] Furthermore, the moving mechanism also includes a slide groove, a sliding column and a magnet. The slide groove is arranged on the lower surface of the lifting rod, the sliding column is arranged in the middle of the upper surface of the connecting plate, the limiting sliding plate at the upper end of the sliding column is vertically slidably connected to the slide groove, and the top wall of the slide groove and the upper end of the sliding column are provided with magnets to limit the position of the connecting plate.

[0010] Furthermore, the moving mechanism also includes a top ball and a spring. The top balls are slidably connected to the grooves on the inner arc surface of the slide groove, and springs are provided between the top balls and the inner wall of the groove to prevent the connecting disk from easily changing its vertical position.

[0011] Furthermore, guide columns are provided at both the front and rear ends of the upper self-closing baffle, and the guide columns are vertically slidably connected to the guide support plate at the upper end of the flow limiting cylinder to provide guide support for the movement of the upper self-closing baffle.

[0012] Furthermore, a lifting ring is provided on the upper movable sleeve of the valve body, and a limiting ring on the inner arc surface of the lifting ring is vertically slidably connected to a limiting groove on the upper end of the valve body, so as to facilitate the control of the lifting height of the lifting rod.

[0013] Compared with the prior art, the beneficial effects of the utility model are: the gas self-closing valve with a flow limiting mechanism has the following advantages:

[0014] When the gas pressure changes but does not exceed the normal pressure range, the change in gas pressure will change the deformation amplitude of the elastic diaphragm, driving the connecting plate to move up and down. Under the connection of the sliding column, the depth of the conical limiting ring inserted into the limiting hole will change. When the adjustment is completed, under the elastic force of the spring, the top ball is inserted into the limiting hole on the outer arc surface of the sliding column to prevent the vertical position of the conical limiting ring from changing easily. By accurately adjusting the cross-sectional area of ​​the gas flow in the gas self-closing valve, the gas flow in the gas self-closing valve is automatically limited, reducing the impact of pressure changes on the gas flow, and making the gas delivery more stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the structure of the utility model;

[0016] Figure 2 It is a structural schematic diagram of the front view cross section of the overall device of the utility model;

[0017] Figure 3 This is an enlarged structural diagram of the utility model at A;

[0018] Figure 4 It is a schematic structural diagram of a side cross-section of the overall device of the utility model.

[0019] In the figure: 1 valve body, 2 lifting sleeve ring, 3 upper self-closing baffle, 4 flow limiting cylinder, 5 flow limiting hole, 6 sliding column, 7 lower self-closing baffle, 8 conical flow limiting ring, 9 moving mechanism, 91 connecting plate, 92 elastic diaphragm, 93 lifting rod, 94 sliding groove, 95 sliding column, 96 magnet, 97 top ball, 98 spring, 10 guide column. DETAILED DESCRIPTION

[0020] 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.

[0021] See also Figure 1-4 , This embodiment provides a technical solution: a gas self-closing valve with a flow limiting mechanism, comprising a valve body 1 and a moving mechanism 9;

[0022] Valve body 1: a flow limiting cylinder 4 is arranged inside the valve body 1, the lower end of the flow limiting cylinder 4 is connected with the air inlet of the valve body 1, a flow limiting hole 5 is arranged at the upper end of the flow limiting cylinder 4, a sliding column 6 is slidably connected inside the flow limiting hole 5, an upper self-closing baffle 3 is arranged at the upper end of the sliding column 6, a lower self-closing baffle 7 is arranged at the lower end of the sliding column 6, a conical flow limiting ring 8 is arranged on the outer arc surface of the sliding column 6, and the conical flow limiting ring 8 is installed in conjunction with the flow limiting hole 5, and the gas enters the flow limiting cylinder 4 through the air inlet. When the air pressure is at normal pressure, the conical flow limiting ring 8 is located inside the flow limiting hole 5, and the gas can be between the outer arc surface of the conical flow limiting ring 8 and the inner arc surface of the flow limiting hole 5 Normal flow, the depth of the conical flow-limiting ring 8 inserted into the flow-limiting hole 5 is related to the size of the gas pressure, and the flow rate of the gas is automatically adjusted. When the gas pressure exceeds the specified pressure, the lower self-closing baffle 7 contacts the top wall of the flow-limiting tube 4 to block the gas from flowing from the flow-limiting hole 5. When the gas pressure is lower than the specified pressure, the upper self-closing baffle 3 contacts the upper surface of the flow-limiting tube 4 to block the gas from flowing from the flow-limiting hole 5. Both the front and rear ends of the upper self-closing baffle 3 are provided with guide columns 10, which are vertically slidably connected to the guide support plate at the upper end of the flow-limiting tube 4 to provide guide support for the up and down movement of the sliding column 6;

[0023] Moving mechanism 9: It is arranged at the upper end of the valve body 1, and the moving mechanism 9 is fixedly connected to the upper self-closing baffle 3. The moving mechanism 9 includes a connecting plate 91 and an elastic diaphragm 92. The connecting plate 91 is arranged on the upper surface of the upper self-closing baffle 3. An elastic diaphragm 92 is arranged between the outer arc surface of the connecting plate 91 and the inner wall of the valve body 1. Through the pressure difference between the air pressure on the upper side of the elastic diaphragm 92 and the gas pressure, the connecting plate 91 drives the upper self-closing baffle 3 and the sliding column 6 to move up and down to achieve the self-closing of the flow limiting hole 5. The moving mechanism 9 also includes a lifting rod 93, which is installed on the upper surface of the connecting plate 91. The lifting rod 93 is vertically slidably connected to the sliding hole at the upper end of the valve body 1, which is convenient for lifting the connecting plate 91 up and down. The moving mechanism 9 also includes a slide groove 94, a sliding column 95 and a magnet 96. The slide groove 94 is arranged on the lower surface of the lifting rod 93, and the sliding column 95 is arranged on the connecting plate In the middle of the upper surface of the connecting plate 91, the limiting sliding plate at the upper end of the sliding column 95 is vertically slidably connected to the sliding groove 94. The top wall of the sliding groove 94 and the upper end of the sliding column 95 are provided with magnets 96. The two magnets 96 generate magnetic force due to the opposite magnetic properties, which limits the up and down position of the connecting plate 91. The moving mechanism 9 also includes a top ball 97 and a spring 98. The top ball 97 is respectively slidably connected to the grooves on the inner arc surface of the sliding groove 94. A spring 98 is provided between the top ball 97 and the inner wall of the groove. Under the elastic force of the spring 98, the top ball 97 is inserted into the limiting hole on the outer arc surface of the sliding column 95 to avoid the vertical position of the conical limiting flow ring 8 from being easily changed, making the limiting flow more stable. A lifting ring 2 is provided on the upper end movable sleeve of the valve body 1. The limiting ring on the inner arc surface of the lifting ring 2 is vertically slidably connected to the limiting groove at the upper end of the valve body 1, which is convenient for lifting the lifting rod 93.

[0024] The working principle of a gas self-closing valve with a flow limiting mechanism provided by the utility model is as follows: when in use, the gas enters the flow limiting cylinder 4 through the air inlet. When the air pressure is at normal pressure, under the pressure difference between the air pressure on the upper side of the elastic diaphragm 92 and the gas pressure, the magnetic force generated by the opposite magnetic properties of the two magnets 96 is overcome, so that the upper self-closing baffle 3 is at a certain distance from the flow limiting cylinder 4. At this time, the conical flow limiting ring 8 is located inside the flow limiting hole 5, and the gas can flow normally between the outer arc surface of the conical flow limiting ring 8 and the inner arc surface of the flow limiting hole 5. When the gas pressure changes but does not exceed the normal pressure range, the change in gas pressure will cause the deformation amplitude of the elastic diaphragm 92 to change, driving the connecting plate 91 to move up and down. Under the connection of the sliding column 6, the depth of the conical flow limiting ring 8 inserted into the flow limiting hole 5 is Changes occur, and the cross-sectional area of ​​the gas flow is changed to limit the gas flow rate and avoid too low or too high gas flow rate. When the adjustment is completed, under the elastic force of the spring 98, the top ball 97 is inserted into the limiting hole on the outer arc surface of the sliding column 95 to avoid the vertical position of the conical limiting ring 8 from changing easily, making the limiting flow more stable. When the gas pressure exceeds the specified pressure, under the action of the pressure difference, the connecting plate 91 drives the sliding column 6 and the lower self-closing baffle 7 to move upward, and the lower self-closing baffle 7 contacts the top wall of the limiting tube 4 to block the gas from flowing from the limiting hole 5. When the gas pressure is lower than the specified pressure, under the action of the pressure difference, the connecting plate 91 drives the upper self-closing baffle 3 to move downward, and the upper self-closing baffle 3 contacts the upper surface of the limiting tube 4 to block the gas from flowing from the limiting hole 5.

[0025] The above are only embodiments of the present invention, and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A gas self-closing valve with a flow limiting mechanism, characterized in that: It comprises a valve body (1) and a moving mechanism (9); The valve body (1) is provided with a flow limiting cylinder (4) inside, the lower end of the flow limiting cylinder (4) is connected to the air inlet of the valve body (1), the upper end of the flow limiting cylinder (4) is provided with a flow limiting hole (5), the interior of the flow limiting hole (5) is slidably connected with a sliding column (6), the upper end of the sliding column (6) is provided with an upper self-closing baffle (3), the lower end of the sliding column (6) is provided with a lower self-closing baffle (7), the outer arc surface of the sliding column (6) is provided with a conical flow limiting ring (8), and the conical flow limiting ring (8) is installed in cooperation with the flow limiting hole (5); Moving mechanism (9): arranged at the upper end of the valve body (1), the moving mechanism (9) is fixedly connected to the upper self-closing baffle (3).

2. A gas self-closing valve with a flow limiting mechanism according to claim 1, characterized in that: The moving mechanism (9) comprises a connecting disk (91) and an elastic diaphragm (92); the connecting disk (91) is arranged on the upper surface of the upper self-closing baffle (3); and the elastic diaphragm (92) is arranged between the outer arc surface of the connecting disk (91) and the inner wall of the valve body (1).

3. A gas self-closing valve with a flow limiting mechanism according to claim 2, characterized in that: The moving mechanism (9) also includes a lifting rod (93), which is installed on the upper surface of the connecting plate (91). The lifting rod (93) is vertically slidably connected to the sliding hole at the upper end of the valve body (1).

4. A gas self-closing valve with a flow limiting mechanism according to claim 3, characterized in that: The moving mechanism (9) also includes a slide groove (94), a sliding column (95) and a magnet (96), wherein the slide groove (94) is arranged on the lower surface of the lifting rod (93), the sliding column (95) is arranged on the middle part of the upper surface of the connecting plate (91), the limiting sliding plate at the upper end of the sliding column (95) is vertically slidably connected to the slide groove (94), and the top wall of the slide groove (94) and the upper end of the sliding column (95) are both provided with a magnet (96).

5. A gas self-closing valve with a flow limiting mechanism according to claim 4, characterized in that: The moving mechanism (9) further comprises a top ball (97) and a spring (98). The top ball (97) is respectively slidably connected to the grooves on the inner arc surface of the slide groove (94). The spring (98) is arranged between the top ball (97) and the inner wall of the groove.

6. A gas self-closing valve with a flow limiting mechanism according to claim 1, characterized in that: The front and rear ends of the upper self-closing baffle (3) are both provided with guide columns (10), and the guide columns (10) are vertically slidably connected to the guide support plate at the upper end of the flow limiting cylinder (4).

7. A gas self-closing valve with a flow limiting mechanism according to claim 1, characterized in that: The upper movable sleeve of the valve body (1) is provided with a lifting sleeve ring (2), and the limiting ring on the inner arc surface of the lifting sleeve ring (2) is vertically slidably connected with the limiting groove at the upper end of the valve body (1).

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