Angle seat valve for high-frequency switching of nitrogen production equipment

Abstract

An angle seat valve used for high-frequency switching of nitrogen-making equipment belongs to the technical field of valve equipment, and includes: a shell, a piston is provided in the shell; a valve body, a valve cavity is provided in the valve body, and a valve core is provided in the valve cavity; a connecting pipe, the upper end of the connecting pipe is connected to the shell, an upper seal is provided in the connecting pipe, the lower end of the connecting pipe is connected to the valve body, a lower seal is provided in the connecting pipe, and an overflow hole is provided on the pipe body of the connecting pipe and between the upper seal and the lower seal for discharging the gas in the connecting pipe. The present invention specially provides an overflow hole on the connecting pipe, and if the control gas source leaks and enters the connecting pipe, it can also overflow from the overflow hole of the connecting pipe to the outside, and will not enter the valve body and cause pollution to the medium gas source in the valve body. The above-mentioned structural optimization proposed by the present invention solves the problem of the traditional angle seat valve that the control gas source leaks and easily causes the medium gas source to be polluted.

Description

Technical Field

[0001] The present invention belongs to the technical field of valve equipment, and more specifically, relates to an angle seat valve used for high-frequency switching of nitrogen production equipment. Background Art

[0002] Angle seat valves are commonly used in a wide range of applications. Their structural features include: 1. They offer high flow rates, low flow resistance, and no water hammer; 2. The Y-shaped design of the angle seat valve body expands the flow cross-section of the valve cavity, smoothing fluid flow and increasing flow rate; and 3. They offer a long service life.

[0003] Angle seat valves are widely used in industries such as food, brewing, beverages, dairy, fine chemicals, pharmaceuticals, and bioengineering. Angle seat valves are typically driven by gas (referred to as the control air source), and the throttling medium (the fluid medium) is generally a liquid. This prevents the control air source from contaminating the liquid. However, when the fluid medium is a gas (referred to as the medium gas source), such as nitrogen, the control air source of the angle seat valve may intrude into the valve body and contaminate the medium gas source (the pure gas).

[0004] In addition, in the existing technology, the piston rod and the valve core are hard-connected by means of threads, nuts, etc., which have good stability during low-frequency switching. However, due to stress concentration at the connection between the piston rod and the valve core, the connection reliability is poor, which limits the use of the angle seat valve in high-frequency switching scenarios. Summary of the Invention

[0005] (1) Technical issues

[0006] In summary, how to solve the problem of leakage of the control air source of the angle seat valve, which easily causes contamination of the medium air source, has become an urgent problem to be solved by those skilled in the art.

[0007] (2) Technical solution

[0008] The present invention provides an angle seat valve for high-frequency switching of nitrogen-generating equipment. In the present invention, the angle seat valve for high-frequency switching of nitrogen-generating equipment includes:

[0009] A housing, wherein a piston is disposed in the housing and an air inlet connected to a control air source is disposed on the housing;

[0010] A valve body, wherein the valve body is provided with a valve cavity, and a valve core is provided in the valve cavity for realizing flow cutoff and conduction of the channel in the valve cavity;

[0011] a connecting pipe, wherein a piston rod is movably provided in the connecting pipe, the upper end of the connecting pipe being connected to the housing and having an upper seal provided therein, the lower end of the connecting pipe being connected to the valve body and having a lower seal provided therein, the upper end of the piston rod passing through the upper seal and connected to the piston, the lower end of the piston rod passing through the lower seal and connected to the valve core, the piston rod and the upper and lower seals all being movable airtight connection structures, an overflow hole being provided on the pipe body of the connecting pipe and between the upper and lower seals for discharging gas in the connecting pipe;

[0012] A pin hole is provided at the bottom of the piston rod, a stabilizing sleeve is provided on the upper side of the valve core, and a pin shaft connects the piston rod and the valve core through the pin hole and the stabilizing sleeve.

[0013] Preferably, in the angle seat valve provided by the present invention for high-frequency switching of nitrogen production equipment, the lower end of the shell is provided with a shell mounting hole for assembling the upper end of the connecting pipe; the upper end of the valve body is provided with a valve body mounting hole for assembling the lower end of the connecting pipe; the connecting pipe is threadedly connected to the shell and the valve body.

[0014] Preferably, in the angle seat valve for high-frequency switching of nitrogen production equipment provided by the present invention, the connecting pipe is a long straight round pipe structure made of metal pipe, and the connecting pipe is an integrated structure.

[0015] Preferably, in the angle seat valve for high-frequency switching of nitrogen production equipment provided by the present invention, an overflow valve is detachably provided on the overflow hole for adjusting the overflow pressure of the gas.

[0016] Preferably, in the angle seat valve for high-frequency switching of nitrogen production equipment provided by the present invention, the valve core includes a disc-shaped valve core body, an annular groove is provided on the lower side of the valve core body, a valve core sealing ring is provided in the annular groove, a stabilizing sleeve is provided on the upper side of the valve core body, a valve core body hole is provided on the upper side of the valve core body, and the lower end of the piston rod passes through the stabilizing sleeve and can be inserted into the valve core body hole for fixation.

[0017] Preferably, in the angle seat valve provided by the present invention for high-frequency switching of nitrogen production equipment, a pin hole is provided on the inner side surface of the stabilization sleeve or the inner side surface of the valve core main body hole, and a pin is elastically provided on the piston rod to be inserted into the pin hole.

[0018] Preferably, in the angle seat valve for high-frequency switching of nitrogen production equipment provided by the present invention, a limiter is provided in the shell and below the piston for limiting the downward movement of the piston, and the limiter is mounted on the piston rod; the limiter and the shell are threadedly connected to each other for adjusting the height of the limiter in the shell.

[0019] Preferably, in the angle seat valve for high-frequency switching of nitrogen production equipment provided by the present invention, a piston groove is provided on the circumferential side surface of the piston, and a piston sealing ring is provided in the piston groove, and the piston sealing ring and the inner side surface of the housing are airtightly slidably matched; the piston sealing ring is an N-type sealing ring.

[0020] Preferably, in the angle seat valve provided by the present invention for high-frequency switching of nitrogen production equipment, a valve cover is provided on the valve body mounting hole; a valve cover mounting hole is provided on the valve cover, and the aperture of the valve cover mounting hole gradually decreases from top to bottom, the lower end of the connecting pipe is connected to the upper section of the valve cover mounting hole, and a guide tube for the piston rod to pass through is provided in the lower section of the valve cover mounting hole, for guiding the movement of the piston rod.

[0021] Preferably, in the angle seat valve for high-frequency switching of nitrogen production equipment provided by the present invention, the valve body is a metal valve body structure, and the valve body is an integrated structure.

[0022] (3) Beneficial effects

[0023] The present invention provides an angle seat valve for high-frequency switching of nitrogen-generating equipment. In the angle seat valve for high-frequency switching of nitrogen-generating equipment provided by the present invention, the angle seat valve comprises: a housing, a piston is provided in the housing, and an air inlet connected to a control air source is provided on the housing; a valve body, the valve body is provided with a valve cavity, and a valve core is provided in the valve cavity for realizing flow cutoff and conduction of the channel in the valve cavity; a connecting pipe, a piston rod is movably provided in the connecting pipe, the upper end of the connecting pipe is connected to the housing, an upper seal is provided therein, the lower end of the connecting pipe is connected to the valve body, a lower seal is provided therein, the upper end of the piston rod passes through the upper seal to connect to the piston, and the lower end of the piston rod passes through the lower seal to connect to the valve core, the piston rod and the upper seal and the lower seal are all movable airtight connection structures, and an overflow hole is provided on the pipe body of the connecting pipe and between the upper seal and the lower seal for discharging gas in the connecting pipe.

[0024] In addition, the present invention also optimizes the structure of the valve core, that is, the valve core includes a disc-shaped valve core body, an annular groove is provided on the lower side of the valve core body, a valve core sealing ring is provided in the annular groove, a stabilizing sleeve is provided on the upper side of the valve core body, a pin hole is provided on the inner side of the stabilizing sleeve or the inner side of the valve core body hole, a pin is elastically provided on the piston rod and is plugged into the pin hole, and the lower end of the piston rod passes through the stabilizing sleeve and can be inserted into the valve core body hole shown to be fixed

[0025] Through the above structural design:

[0026] 1. The angle seat valve provided by the present invention is specially provided with an overflow hole on the connecting pipe. The overflow hole has the function of gas overflow. In this way, if the connection sealing between the housing and the connecting pipe is reduced, if the control gas source leaks and enters the connecting pipe, it can also overflow to the outside through the overflow hole of the connecting pipe without entering the valve body and contaminating the medium gas source inside the valve body. The above structural optimization proposed by the present invention solves the problem of traditional angle seat valves that control gas source leakage easily causes medium gas source contamination;

[0027] 2. The angle seat valve piston rod and valve core provided by the present invention are connected by a pin structure, which significantly improves the reliability and firmness of the structure, making it suitable for high-frequency switching of angle seat valves. At the same time, the valve core has a certain movable angle, and the valve core adaptively fits the valve seat when it falls, effectively improving the valve sealing performance. The above structural optimization proposed by the present invention solves the problem of poor reliability and easy detachment of the piston rod and valve core connection under high-frequency switching conditions, and improves the valve sealing performance.

[0028] 3. The piston rod and valve core are connected by a pin structure, which significantly improves the reliability and firmness of the structure, making it suitable for the high-frequency switching of angle seat valves. At the same time, the valve core has a certain movable angle, and the valve core adaptively fits the valve seat when it falls, effectively improving the valve sealing performance. The structural design of the valve core of this invention can solve the problem of poor reliability and easy separation between the piston rod and valve core under high-frequency switching conditions, thereby improving the valve sealing performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a schematic structural diagram of an angle seat valve used for high-frequency switching of nitrogen production equipment in an embodiment of the present invention.

[0030] exist Figure 1 , the corresponding relationship between component names and reference numerals is as follows:

[0031] Housing 1, piston 2, valve body 3, valve core 4, connecting pipe 5, piston rod 6, limiter 7,

[0032] Valve cover 8, pin 9. DETAILED DESCRIPTION

[0033] To make the objectives, technical solutions and advantages of the present invention more clear, the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

[0034] In addition, in the description of the present invention, the terms "longitudinal", "transverse", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the present invention and do not require that the present invention must be constructed and operated in a specific orientation. Therefore, they should not be understood as limitations on the present invention. The terms "connected" and "connected" used in the present invention should be understood in a broad sense. For example, they can be fixed connections or detachable connections; they can be directly connected or indirectly connected through intermediate components. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0035] Please refer to Figure 1 , Figure 1 This is a schematic structural diagram of an angle seat valve used for high-frequency switching of nitrogen production equipment in an embodiment of the present invention.

[0036] The present invention provides an angle seat valve for high-frequency switching of nitrogen-generating equipment. In a specific embodiment of the present invention, the basic structure of the angle seat valve for high-frequency switching of nitrogen-generating equipment is as follows: it includes three main structures, namely a shell 1 (upper structure), a connecting pipe 5 (middle structure) and a valve body 3 (lower structure). As for the valve body 3, it adopts a Y-type structure and has three branch interfaces, namely an inlet interface, an outlet interface and a valve body mounting hole. The inlet interface and the outlet interface are basically located on the same axis (so as to facilitate the passage of fluid). The valve body 3 has a valve cavity, and a valve core 4 is arranged in the valve cavity. The valve core 4 can be blocked in the channel formed by the inlet interface and the outlet interface, thereby realizing the interception and conduction of the fluid in the valve cavity. In the present invention, the valve body 3 is made of metal material, preferably alloy steel or cast iron. Furthermore, the present invention further provides a valve cover 8 over the valve body mounting hole of the valve body 3. The valve cover mounting hole is provided on the valve cover 8, and the diameter of the valve cover mounting hole gradually decreases from top to bottom (it can also be a uniform diameter circular hole structure). The lower end of the connecting tube 5 is connected to the upper section of the valve cover mounting hole (preferably by threaded connection, and the seal can be reinforced by sealing means, such as the provision of sealant in the gap). A guide tube for the piston rod 6 to pass through is provided in the lower section of the valve cover mounting hole to guide the movement of the piston rod 6. The diameter of the guide tube is slightly larger than the diameter of the piston rod 6, for example, the diameter of the guide tube is 1 mm to 2 mm larger than the diameter of the piston rod 6. The connecting tube 5 is a structure that connects the housing 1 and the valve body 3 and is also used to assemble the piston rod 6. In the present invention, the connecting tube 5 is a uniform diameter straight circular tube structure, and the inner diameter of the connecting tube 5 is larger than the diameter of the piston rod 6. This creates a non-contact structure between the piston rod 6 and the connecting tube 5, ensuring that the piston rod 6 can flexibly and smoothly perform high-speed reciprocating motion. A piston 2 is provided inside the housing 1. The piston 2 is provided in the housing 1 so as to be movable up and down. A control air source interface is provided above the upper limit of the piston 2 stroke, and a control air source interface is provided below the lower limit of the piston 2 stroke. The two control air source interfaces are connected to the control air source, and the air pressure on both sides of the piston 2 is changed by the action of inflation and exhaust to drive the piston 2 to move. In the present invention, the piston 2 is a disc structure, preferably a disc structure. The lower side of the piston 2 is a plane. A piston mounting hole is provided at the centroid of the piston 2. The upper end of the piston rod 6 can be inserted into the piston mounting hole to achieve a fixed connection with the piston 2. The movement of the piston 2 will drive the piston rod 6 to move together. The bottom end of the piston rod 6 is provided with a valve core 4. The valve core 4 moves with the piston rod 6 to achieve the conduction and closing of the channel in the valve body 3. Furthermore, the present invention also provides a limiter 7 in the housing 1 and below the piston 2. The limiter 7 is provided in the housing 1 and below the piston 2 to limit the downward movement of the piston 2. The limiter 7 has a through hole structure, so that the limiter 7 can be mounted on the piston rod 6. The limiter 7 and the housing 1 are threadedly connected to each other for adjusting the height of the limiter 7 in the housing 1.Specifically, the limiter 7 includes a limiting platform. The upper side of the limiting platform is a planar structure (the lower side of the piston 2 is a planar structure, so that when the piston moves downward, the lower side of the piston 2 and the upper side of the limiting platform can stop the downward movement). The lower side of the limiting platform is provided with an adjustment column, which is a tubular structure. The adjustment column is threaded with the housing 1 and is used to adjust the height of the limiting platform in the housing 1. Adjusting the height of the limiting platform is to adjust the downward limit position of the piston. The section corresponding to the stroke of the piston 2 in the housing 1 is consistent with the shape of the piston 2 (the cross-sectional shape and size of the section do not change), which can ensure the stable movement of the piston 2. Preferably, the piston 2 is a disc-shaped structure, and a piston groove is provided on the outer ring surface of the piston 2. A piston sealing ring is provided in the piston groove, wherein the piston sealing ring is an N-type sealing ring, which can separate the upper and lower spaces of the piston 2 (the gas in the upper space is separated from the gas in the lower space), thereby improving the accuracy of the pneumatic drive.

[0037] It should be noted that in the present invention, the structure that has active contact with the piston rod 6 or the piston 2 needs to be provided with a structure similar to a sealing ring at its connection position to ensure the airtightness of the active connection. The prior art can be referred to, and the present invention will no longer describe all the structures in detail.

[0038] The valve core 4 is mounted at the bottom end of the piston rod 6 and located within the valve body 3, enabling fluid flow interception and conduction. The connection between the valve core 4 and the piston rod 6 is as follows: the valve core 4 comprises a disc-shaped valve core body, with an annular groove provided on its lower side, a valve core sealing ring disposed within the annular groove, a stabilizing sleeve provided on its upper side, and a valve core body hole provided on its upper side. The lower end of the piston rod 6 passes through the stabilizing sleeve and can be inserted into the valve core body hole for fixation.

[0039] Furthermore, a cut-off front end is provided on the bottom surface of the valve core body, and the cut-off front end is preferably a ball head structure. An inner groove of the valve body 3 that matches the shape of the cut-off front end is also provided inside the valve body 3. When the cut-off front end moves in the inner groove of the valve body 3 (approaching or leaving), its flow area gradually decreases or gradually increases. By providing the cut-off front end, the fluid flow rate can be gradually reduced before the valve core 4 is closed, or the fluid flow rate can be gradually increased before the valve core 4 is opened.

[0040] Based on the basic structure of the above-mentioned angle seat valve, the present invention provides an angle seat valve for high-frequency switching of nitrogen-generating equipment, which also includes the following structural optimization design: the angle seat valve for high-frequency switching of nitrogen-generating equipment includes a shell 1, a piston 2 is provided in the shell 1, and an air port connected to the control air source is provided on the shell 1; a valve body 3, the valve body 3 is provided with a valve cavity, and a valve core 4 is provided in the valve cavity for realizing flow cutoff and conduction of the channel in the valve cavity; a connecting pipe 5, a piston rod 6 is movably provided in the connecting pipe 5, the upper end of the connecting pipe 5 is connected to the shell 1, and an upper seal is provided therein, the lower end of the connecting pipe 5 is connected to the valve body 3, and a lower seal is provided therein, the upper end of the piston rod 6 passes through the upper seal and is connected to the piston 2, and the lower end of the piston rod 6 passes through the lower seal and is connected to the valve core 4, the piston rod 6 and the upper seal and the lower seal are all movable airtight connection structures, and an overflow hole is provided on the pipe body of the connecting pipe 5 and between the upper seal and the lower seal for discharging the gas in the connecting pipe 5.

[0041] In the prior art, the connecting pipe 5 is a complete pipe (without any orifice structure, etc.), which only has the function of connecting the shell 1 and the valve body 3. In the present invention, an overflow hole is creatively provided on the connecting pipe 5, so that the connecting pipe 5 has the function of gas overflow, so that even if the control gas source in the shell 1 (the gas used to control the movement of the piston 2) leaks partially, it can be output through the overflow hole. In addition, the overflow hole is provided on the connecting pipe 5, and the connection sealing between the connecting pipe 5 and the shell 1 is basically consistent with the connection sealing between the connecting pipe 5 and the valve body 3. There is fluid flowing through the valve body 3 (the medium gas source), and there is also gas in the shell 1 (the control gas source). If the gas in the valve body 3 and the gas in the shell 1 leak, they will gather in the connecting pipe 5 and then overflow from the overflow hole. In this way, the connecting pipe 5 forms a buffer zone and a release zone structure, which can prevent the control gas source from entering the valve body 3 and contaminating the medium gas source to the greatest extent.

[0042] Specifically, the lower end of the shell 1 is provided with a shell 1 mounting hole for assembling the upper end of the connecting pipe 5; the upper end of the valve body 3 is provided with a valve body mounting hole for assembling the lower end of the connecting pipe 5; the connecting pipe 5 is threadedly connected to the shell 1 and the valve body 3.

[0043] Specifically, the connecting pipe 5 is a long straight circular tube structure made of a metal tube (the connecting pipe 5 is preferably an alloy tube, such as a steel alloy), and the connecting pipe 5 is an integrated structure. An overflow hole is provided on the connecting pipe 5, and the overflow hole can allow the gas (whether it is a control gas source or a medium gas source) entering the connecting pipe 5 to overflow. Furthermore, the present invention is detachably provided with an overflow valve on the overflow hole for adjusting the overflow pressure of the gas. The overflow valve can be a rubber plug structure. When there is gas inside the connecting pipe 5, the gas pressure is greater than the atmospheric pressure, then the membrane flap of the rubber plug (the rubber plug is provided with a small hole, and a membrane flap is provided at the small hole. The membrane flap can be pushed open by pressure, so that the small hole opens to release gas) can be pushed open, thereby releasing gas. Providing an overflow valve structure can also prevent external impurities from entering the connecting pipe 5, especially dust or sewage.

[0044] The valve core 4 has the following specific structure: the valve core 4 comprises a disc-shaped valve core body, with an annular groove disposed on the lower side of the valve core body, a valve core sealing ring disposed within the annular groove, a stabilizing sleeve disposed on the upper side of the valve core body, and a valve core body hole disposed on the upper side of the valve core body. The lower end of the piston rod 6 passes through the stabilizing sleeve and can be inserted into the valve core body hole for fixation. Furthermore, a latch hole is disposed on the inner side of the stabilizing sleeve or the inner side of the valve core body hole, and a latch is elastically disposed on the piston rod 6 to engage with the latch hole. The latch structure connects the piston rod 6 to the valve core 4, allowing the valve core 4 to have a certain degree of adjustment in its posture. When the valve core 4 is disturbed by airflow, it self-adjusts under the pressure of the piston rod 6, ensuring that the airflow is completely cut off. (If the valve core 4 is not properly positioned, the passage within the valve body 3 will not be completely closed, and the airflow cannot be completely cut off.)

[0045] Specifically, a limiter 7 is provided in the housing 1 and below the piston 2 for limiting the downward movement of the piston 2. The limiter 7 is mounted on the piston rod 6. The limiter 7 and the housing 1 are threadedly connected to each other for adjusting the height of the limiter 7 in the housing 1.

[0046] In another embodiment of the present invention, a valve cover 8 is further provided on the valve body mounting hole. The valve cover 8 is generally similar to the main body structure and is provided with a valve cover mounting hole. The diameter of the valve cover mounting hole gradually decreases from top to bottom. The lower end of the connecting tube 5 is connected to the upper section of the valve cover mounting hole. A guide tube for the piston rod 6 to pass through is provided in the lower section of the valve cover mounting hole to guide the movement of the piston rod 6. The guide tube can guide the movement of the piston rod 6, ensuring that the piston rod 6 remains highly stable during high-speed reciprocating motion.

[0047] As can be seen from the above, the present invention provides an angle seat valve for high-frequency switching of nitrogen-generating equipment. In the angle seat valve for high-frequency switching of nitrogen-generating equipment provided by the present invention, the angle seat valve comprises: a shell 1, a piston 2 is provided in the shell 1, and an air inlet connected to a control air source is provided on the shell 1; a valve body 3, the valve body 3 is provided with a valve cavity, and a valve core 4 for realizing flow cutoff and conduction of the channel in the valve cavity is provided in the valve cavity; a connecting pipe 5, a piston rod 6 is movably provided in the connecting pipe 5, the upper end of the connecting pipe 5 is connected to the shell 1, an upper seal is provided therein, the lower end of the connecting pipe 5 is connected to the valve body 3, a lower seal is provided therein, the upper end of the piston rod 6 passes through the upper seal to connect with the piston 2, and the lower end of the piston rod 6 passes through the lower seal to connect with the valve core 4, the piston rod 6 and the upper seal and the lower seal are all movable airtight connection structures, and an overflow hole is provided on the pipe body of the connecting pipe 5 and between the upper seal and the lower seal for discharging the gas in the connecting pipe 5.

[0048] The angle seat valve provided by this invention features high switching frequency (40-60 seconds), strong sealing (leakage rate Class V), fast response time (0.2-0.5 seconds), strong directionality (forward and reverse), and low maintenance. The housing (1), connecting pipe (5), and valve body (3) all adopt a modular design for easy maintenance and replacement.

[0049] Through the above-mentioned structural design, the angle seat valve provided by the present invention is specially provided with an overflow hole on the connecting pipe 5. The overflow hole has the function of gas overflow. Therefore, if the sealing between the housing 1 and the connecting pipe 5 is reduced, if the control air source leaks and enters the connecting pipe 5, it can also overflow from the overflow hole of the connecting pipe 5 to the outside world without entering the valve body 3 and contaminating the medium air source in the valve body 3. The above-mentioned structural optimization proposed by the present invention solves the problem of conventional angle seat valves that control air source leakage easily causes medium air source contamination.

[0050] It is understood from common technical knowledge that the present invention may be implemented by other embodiments that do not depart from its spirit or essential features. Therefore, the embodiments disclosed above are, in all respects, merely illustrative and not exclusive. All modifications within the scope of the present invention or equivalent to the scope of the present invention are intended to be encompassed by the present invention.

Claims

1. An angle seat valve used for high-frequency switching of nitrogen production equipment, characterized in that: include: A housing (1), a piston (2) is provided in the housing, and an air inlet connected to a control air source is provided on the housing; A valve body (3), the valve body being provided with a valve cavity, wherein a valve core (4) is provided in the valve cavity for realizing flow cutoff and conduction of a channel in the valve cavity; A connecting pipe (5), wherein a piston rod (6) is movably provided in the connecting pipe, the upper end of the connecting pipe is connected to the housing and an upper seal is provided therein, the lower end of the connecting pipe is connected to the valve body and a lower seal is provided therein, the upper end of the piston rod passes through the upper seal and is connected to the piston, and the lower end of the piston rod passes through the lower seal and is connected to the valve core, the piston rod and the upper seal and the lower seal are all movable airtight connection structures, an overflow hole is provided on the pipe body of the connecting pipe and between the upper seal and the lower seal for discharging gas in the connecting pipe; The bottom of the piston rod is provided with a pin hole, and a stabilizing sleeve is provided on the upper side of the valve core. A pin shaft (9) connects the piston rod to the valve core through the pin hole and the stabilizing sleeve. A valve cover (8) is provided on the valve body mounting hole; A valve cover mounting hole is provided on the valve cover, and the aperture of the valve cover mounting hole gradually decreases from top to bottom. The lower end of the connecting pipe is connected to the upper section of the valve cover mounting hole. A guide tube for the piston rod to pass through is provided in the lower section of the valve cover mounting hole to guide the movement of the piston rod. The inner diameter of the connecting pipe is larger than the diameter of the piston rod, and the piston rod and the connecting pipe are in a non-contact structure; A cutoff front end is also provided on the bottom surface of the valve core body, and the cutoff front end is a ball head structure. A valve body groove that matches the shape of the cutoff front end is also provided inside the valve body. When the cutoff front end moves in the valve body groove, its flow area gradually decreases or increases. By setting the cutoff front end, the fluid flow rate can be gradually reduced before the valve core is closed, or the fluid flow rate can be gradually increased before the valve core is opened.

2. The angle seat valve for high-frequency switching of nitrogen production equipment according to claim 1 is characterized in that: The lower end of the shell is provided with a shell mounting hole for assembling the upper end of the connecting pipe; The upper end of the valve body is provided with a valve body mounting hole for assembling the lower end of the connecting pipe; The connecting pipe is threadedly connected to the housing and the valve body.

3. The angle seat valve for high-frequency switching of nitrogen production equipment according to claim 1 is characterized in that: The connecting pipe is a long straight round pipe structure made of metal pipe, and the connecting pipe is an integrated structure.

4. The angle seat valve for high-frequency switching of nitrogen production equipment according to claim 1 is characterized in that: An overflow valve is detachably provided on the overflow hole for adjusting the overflow pressure of the gas.

5. The angle seat valve for high-frequency switching of nitrogen production equipment according to claim 1 is characterized in that: The valve core includes a disc-shaped valve core body, an annular groove is provided on the lower side of the valve core body, a valve core sealing ring is provided in the annular groove, a stabilizing sleeve is provided on the upper side of the valve core body, and a valve core body hole is provided on the upper side of the valve core body. The lower end of the piston rod passes through the stabilizing sleeve and can be inserted into the valve core body hole for fixation.

6. The angle seat valve for high-frequency switching of nitrogen production equipment according to claim 5, characterized in that: A latch hole is provided on the inner side surface of the stabilizing sleeve or the inner side surface of the valve core main body hole, and a latch is elastically provided on the piston rod and is plugged into and matched with the latch hole.

7. The angle seat valve for high-frequency switching of nitrogen production equipment according to claim 1, characterized in that: A limiter (7) is provided in the housing and below the piston, for limiting the downward movement of the piston, and the limiter is sleeved on the piston rod; The stopper and the housing are in a threaded connection structure, which is used for adjusting the height of the stopper in the housing.

8. The angle seat valve for high-frequency switching of nitrogen production equipment according to claim 1, characterized in that: A piston groove is provided on the circumferential side surface of the piston, a piston sealing ring is provided in the piston groove, and an airtight sliding fit is formed between the piston sealing ring and the inner side surface of the housing; The piston sealing ring is an N-type sealing ring.

9. The angle seat valve for high-frequency switching of nitrogen production equipment according to claim 1, characterized in that: The valve body is a metal valve body structure, and the valve body is an integrated structure.

Images