Pilot-operated type nitrogen supply valve

Abstract

The utility model discloses a pilot-operated type nitrogen supply valve, which relates to the field of nitrogen supply valves, and comprises a nitrogen supply valve body, a through groove is arranged on the lower surface of the nitrogen supply valve body, the through groove is communicated with the air inlet end of the nitrogen supply valve body, and a breather pipe is fixedly arranged at the position of the nitrogen supply valve body corresponding to the through groove. A one-way valve assembly is installed at the position of an air outlet of the ventilation pipe and used for controlling air to overflow from the interior of the ventilation pipe. According to the pilot-operated type nitrogen supply valve, the nitrogen supply valve body and the ventilation pipe are arranged, in the gas transmission process, the ventilation pipe is in the closed state, when the nitrogen supply valve body is closed, nitrogen is still continuously input into the input end of the nitrogen supply valve body, at the moment, the air pressure of the nitrogen in the nitrogen supply valve body continuously rises, and the nitrogen supply valve body is closed. When the pressure of the nitrogen is greater than a set value of the one-way valve assembly, the one-way valve assembly is opened to discharge nitrogen, so that the nitrogen supply valve body and the delivery pipeline can be protected, and the use safety is ensured.

Description

Technical Field

[0001] The utility model relates to the field of nitrogen supply valves, and particularly relates to a pilot-operated nitrogen supply valve. Background Technique

[0002] A nitrogen supply valve is a valve that ensures the stable air pressure inside the tank when nitrogen is transmitted in the system. The nitrogen supply valve does not require external energy during use. When nitrogen passes from a high-pressure gas storage tank or gas cylinder through the nitrogen supply valve into the system, the nitrogen will pass through a precise regulating mechanism to gradually reduce the pressure from the high-pressure area to a stable low-pressure area. During this process, the nitrogen molecules gradually diffuse and reduce their density, thereby achieving the control of the nitrogen flow rate.

[0003] Chinese Patent No. CN 202023185412.7 discloses a high-precision pilot-operated nitrogen supply valve, which ensures the tightness of the connection between the valve core and the valve seat by setting a spring to compensate for the deviation between the valve core and the valve seat, and ensures the sealing accuracy. However, when the pressure at the outlet end of the nitrogen supply valve is greater than that at the inlet end, the valve closes. However, since it is difficult to observe the movement state of the valve core inside the valve, when the inlet end continuously intakes gas, excessive pressure will have a greater impact on the transmission pipeline or the nitrogen supply valve itself. Content of the Utility Model

[0004] The main purpose of the utility model is to provide a pilot-operated nitrogen supply valve, which can effectively solve the problems in the background technique.

[0005] To achieve the above purpose, the technical solution adopted by the utility model is: a pilot-operated nitrogen supply valve, including a nitrogen supply valve body. A through groove is opened on the lower surface of the nitrogen supply valve body, and the through groove is communicated with the inlet end of the nitrogen supply valve body. A ventilation pipe is fixedly installed at the position of the nitrogen supply valve body corresponding to the through groove, and a one-way valve assembly is installed at the air outlet position of the ventilation pipe. The one-way valve assembly is used to control the overflow of gas from the inside of the ventilation pipe.

[0006] The one-way valve assembly includes a main pipe body. An air leakage pipe is fixedly installed on the surface of the main pipe body, and the inside of the main pipe body is communicated with the inside of the air leakage pipe. A frustum-shaped valve core is installed inside the main pipe body, and the valve core abuts against the inside of the ventilation pipe. A spring is installed on the surface of the valve core, and one end of the spring abuts against the inner wall of the main pipe body.

[0007] A guiding groove is opened on the surface of the valve core, and a guiding rod is movably installed inside the guiding groove. A connecting plate is fixedly installed on the surface of the guiding rod, and one end of the spring is fixed on the surface of the connecting plate, and the other end of the spring is not connected to the valve core.

[0008] One end of the guiding rod penetrates through the connecting plate. A threaded groove is formed on the surface of the guiding rod on one side of the connecting plate. A corresponding threaded circular groove is formed on the surface of the main pipe body. The surface of the threaded groove is threadedly connected to the inner wall of the threaded circular groove. A knob is fixedly installed at one end of the guiding rod outside the main pipe body.

[0009] The main pipe body is an internally threaded pipe, and the ventilation pipe is an externally threaded pipe. The main pipe body is threadedly installed on the surface of the ventilation pipe.

[0010] The length of the guiding rod is greater than the depth of the guiding groove.

[0011] Compared with the prior art, the utility model has the following beneficial effects:

[0012] 1. In the utility model, by arranging the nitrogen supply valve body and the ventilation pipe, during the process of gas transmission, the ventilation pipe is in a closed state. When the nitrogen supply valve body is closed, its input end is still continuously inputting nitrogen. At this time, the nitrogen pressure in the nitrogen supply valve body continuously rises. When the nitrogen pressure is greater than the set value of the one-way valve assembly, the one-way valve assembly will be opened and the nitrogen will be discharged, which can protect the nitrogen supply valve body and the conveying pipeline and ensure the use safety.

[0013] 2. In the utility model, by arranging the guiding rod, the spring and the connecting plate, by rotating the knob to move the guiding rod, the guiding rod moves into the guiding groove. At this time, the connecting plate squeezes the spring, making the initial spring pressure increase. At this time, a greater air pressure is required to squeeze and move the valve core, which is suitable for different usage situations. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is the overall structural schematic diagram of a pilot-operated nitrogen supply valve of the utility model;

[0015] Figure 2 is the partial structural schematic diagram of the ventilation pipe position of a pilot-operated nitrogen supply valve of the utility model;

[0016] Figure 3 is the partial structural schematic diagram of the inside of the main pipe body of a pilot-operated nitrogen supply valve of the utility model;

[0017] Figure 4 is the partial structural schematic diagram of the spring position of a pilot-operated nitrogen supply valve of the utility model;

[0018] Figure 5 is the partial structural schematic diagram of the threaded circular groove position of a pilot-operated nitrogen supply valve of the utility model;

[0019] Figure 6 is the partial structural schematic diagram of the guiding groove position of a pilot-operated nitrogen supply valve of the utility model.

[0020] In the figure: 1. Nitrogen supply valve body; 2. Vent pipe; 3. Main pipe body; 4. Leakage pipe; 5. Valve core; 6. Spring; 7. Guide groove; 8. Guide rod; 9. Connecting plate; 10. Thread groove; 11. Threaded round groove; 12. Knob. Specific embodiments

[0021] In order to make the technical means, creative features, achieved purposes and functions of the present utility model easy to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0022] As Figures 1-6 shown, to achieve the above object, the technical solution adopted by the present utility model is: a pilot-operated nitrogen supply valve, including a nitrogen supply valve body 1. When the nitrogen supply valve body 1 conducts air, nitrogen is output from the air outlet. When the nitrogen pressure at the output port is greater than the nitrogen pressure at the input port, the nitrogen supply valve body 1 closes. A through groove is opened on the lower surface of the nitrogen supply valve body 1, and the through groove communicates with the intake end of the nitrogen supply valve body 1. A vent pipe 2 is fixedly installed at the position of the nitrogen supply valve body 1 corresponding to the through groove. A check valve assembly is installed at the air outlet position of the vent pipe 2. In the initial state, the vent pipe 2 is in a closed state, and the check valve assembly is used to control the gas from overflowing from the inside of the vent pipe 2.

[0023] The air pressure setting value of the check valve assembly is greater than the air pressure at the output end of the nitrogen supply valve body 1. At this time, it can be ensured that during the gas transmission process, the vent pipe 2 is in a closed state. When the nitrogen supply valve body 1 closes, nitrogen is still continuously input at its input end. At this time, the nitrogen pressure inside the nitrogen supply valve body 1 rises continuously. When the nitrogen pressure is greater than the setting value of the check valve assembly, the check valve assembly will be opened and nitrogen will be discharged, which can protect the nitrogen supply valve body 1 and the conveying pipeline and ensure the use safety.

[0024] The check valve assembly includes a main pipe body 3. A leakage pipe 4 is fixedly installed on the surface of the main pipe body 3. In this embodiment, the number of leakage pipes 4 is set to two, which are respectively located on both sides of the main pipe body 3. The inside of the main pipe body 3 is communicated with the inside of the leakage pipe 4. A frustum-shaped valve core 5 is installed inside the main pipe body 3. The valve core 5 abuts against the inside of the vent pipe 2. A spring 6 is installed on the surface of the valve core 5. One end of the spring 6 abuts against the inner wall of the main pipe body 3. When the air pressure is greater than the elastic force of the spring 6, the spring 6 will be compressed, the valve core 5 will disengage from the inside of the leakage pipe 4, and the gas will leak from the inside of the leakage pipe 4.

[0025] A guide groove 7 is opened on the surface of the valve core 5. A guide rod 8 is movably installed inside the guide groove 7. The guide rod 8 moves inside the guide groove 7 to prevent the valve core 5 from moving and deviating. A connecting plate 9 is fixedly installed on the surface of the guide rod 8. One end of the spring 6 is fixed on the surface of the connecting plate 9, and the other end of the spring 6 is not connected to the valve core 5.

[0026] One end of the guide rod 8 penetrates through the connecting plate 9. A threaded groove 10 is formed on the surface of the guide rod 8 on one side of the connecting plate 9. A corresponding threaded circular groove 11 is formed on the surface of the main pipe body 3. The surface of the threaded groove 10 is threadedly connected to the inner wall of the threaded circular groove 11. A knob 12 is fixedly installed at the end of the guide rod 8 outside the main pipe body 3.

[0027] When it is necessary to adjust the pressure value of the one-way valve assembly, the guide rod 8 is rotated through the knob 12, so that the guide rod 8 moves into the inside of the guide groove 7. At this time, the connecting plate 9 squeezes the spring 6, making the pressure of the spring 6 in the initial state increase. At this time, a greater air pressure is required to squeeze and move the valve core 5, which is applicable to different usage situations.

[0028] The main pipe body 3 is an internally threaded pipe, and the ventilation pipe 2 is an externally threaded pipe. The main pipe body 3 is threadedly installed on the surface of the ventilation pipe 2, which is convenient for the installation and disassembly of the main pipe body 3.

[0029] The length of the guide rod 8 is greater than the depth of the guide groove 7. When the one-way valve assembly is not needed, the guide rod 8 is rotated close to the inner wall of the guide groove 7 until the valve core 5 completely abuts against the inside of the ventilation pipe 2, and then the spring 6 is completely compressed.

[0030] It should be noted that the present invention is a pilot-operated nitrogen supply valve. When in use, the guide rod 8 is rotated through the knob 12, so that the guide rod 8 moves into the inside of the guide groove 7. At this time, the connecting plate 9 squeezes the spring 6, making the pressure of the spring 6 in the initial state increase. At this time, a greater air pressure is required to squeeze and move the valve core 5, and its elastic force is greater than the air pressure at the output end of the nitrogen supply valve body 1. At this time, it can be ensured that during the gas transmission process, the ventilation pipe 2 is in a closed state. When the nitrogen supply valve body 1 is closed, nitrogen is still continuously input at its input end. At this time, the internal air pressure of the nitrogen supply valve body 1 rises continuously. When the nitrogen air pressure is greater than the elastic force, the valve core 5 opens and nitrogen is discharged, which can protect the nitrogen supply valve body 1 and the ventilation pipeline and ensure the use safety.

[0031] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and the descriptions in the specification only illustrate the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A pilot-operated nitrogen supply valve, comprising a nitrogen supply valve body (1), characterized in that: A through groove is formed in the lower surface of the nitrogen supply valve body (1), and the through groove communicates with the air inlet end of the nitrogen supply valve body (1). A ventilation pipe (2) is fixedly installed at the position of the nitrogen supply valve body (1) corresponding to the through groove, and a one-way valve assembly is installed at the air outlet position of the ventilation pipe (2). The one-way valve assembly is used to control the overflow of gas from the inside of the ventilation pipe (2).

2. The pilot-operated nitrogen supply valve according to claim 1, wherein: The one-way valve assembly includes a main pipe body (3). A leakage pipe (4) is fixedly installed on the surface of the main pipe body (3), and the inside of the main pipe body (3) communicates with the inside of the leakage pipe (4). A frustum-shaped valve core (5) is installed inside the main pipe body (3), and the valve core (5) abuts against the inside of the ventilation pipe (2). A spring (6) is installed on the surface of the valve core (5), and one end of the spring (6) abuts against the inner wall of the main pipe body (3).

3. The pilot-operated nitrogen supply valve according to claim 2, characterized in that: A guiding groove (7) is formed in the surface of the valve core (5), and a guiding rod (8) is movably installed inside the guiding groove (7). A connecting plate (9) is fixedly installed on the surface of the guiding rod (8), and one end of the spring (6) is fixed on the surface of the connecting plate (9), and the other end of the spring (6) is not connected to the valve core (5).

4. The pilot-operated nitrogen supply valve according to claim 3, wherein: One end of the guiding rod (8) penetrates through the connecting plate (9). A threaded groove (10) is formed in the surface of the guiding rod (8) on one side of the connecting plate (9). A corresponding threaded round groove (11) is formed in the surface of the main pipe body (3). The surface of the threaded groove (10) is threadedly connected to the inner wall of the threaded round groove (11). A knob (12) is fixedly installed at the end of the guiding rod (8) outside the main pipe body (3).

5. The pilot-operated nitrogen supply valve according to claim 2, characterized in that: The main pipe body (3) is an internally threaded pipe, and the ventilation pipe (2) is an externally threaded pipe. The main pipe body (3) is threadedly installed on the surface of the ventilation pipe (2).

6. The pilot-operated nitrogen supply valve according to claim 3, wherein: The length of the guiding rod (8) is greater than the depth of the guiding groove (7).

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