Pilot-operated type high-pressure shear valve

Abstract

The invention belongs to the technical field of valve manufacturing, and particularly relates to a valve started through electric heating. According to the technical scheme, the pilot-operated type high-pressure shear valve comprises an air inlet valve body, a piston, a main valve body and an air release valve body. The air inlet valve body is provided with a pilot hole sealed after a hot melting material is condensed and an annular shearing groove. In a storage state, high-pressure gas cannot enter the pressure storage chamber from the gas inlet valve body; when the hot melting material is heated and melted, the pilot hole is conducted, high-pressure gas enters the pressure storage chamber to form high pressure to act on the bottom of the piston, the piston pulls a shearing groove of the air inlet valve body under the action of thrust, the air inlet valve body is sheared and fractured in the axial direction, the piston slides upwards under the action of the high-pressure gas and the pressure spring, sealing between the piston and the main valve body is relieved, and the valve body is closed. High-pressure gas flows into the gas release valve body through a cavity in the main valve body, and a sealed gas channel is formed. The valve is in an absolute sealing state before being opened, and gas leakage and accidental valve opening risks are avoided; after the pilot hole is opened, the valve can be opened stably, and the required power consumption is low.

Description

Technical Field

[0001] The invention belongs to the technical field of valve manufacturing, and in particular relates to a valve started by electric heating. Background Art

[0002] Most of the high-pressure valves used in industry now are solenoid valves, electric explosion valves, etc. Solenoid valves use rubber seals to achieve valve sealing, which poses the risk of aging and leakage of sealing materials during long-term storage, and the high-pressure resistant solenoid valves themselves are heavy. Electric explosion valves can ensure long-term sealing, but they involve pyrotechnics, which places high demands on storage management and transportation, and are costly. Therefore, when long-term high-pressure storage is required and pyrotechnics cannot be used, a valve that is absolutely sealed before opening and is activated by electric heating has greater advantages. Summary of the invention

[0003] The purpose of the present invention is to provide a pilot-operated high-pressure shear valve in response to usage requirements.

[0004] The technical solution of the present invention is: a pilot-operated high-pressure shear valve, comprising: an intake valve body, a piston, a main valve body and a relief valve body.

[0005] The main valve body is connected to the intake valve body and the exhaust valve body to form a sealed cavity structure. Valve body sealing rings are respectively arranged at the contact surfaces of the main valve body, the intake valve body and the exhaust valve body.

[0006] The piston is threadedly connected to the intake valve body, with a compression spring arranged therebetween; a round pancake-shaped pressure storage chamber is arranged between the piston and the intake valve body; and a radial seal is arranged between the piston and the main valve body.

[0007] The intake valve body is provided with a pilot hole and an annular shear groove which are sealed by condensation of hot-melt material; the aperture of the pilot hole is very small. In the storage state, the pilot hole is closed, and the high-pressure gas is completely sealed in the intake hole of the intake valve body, so that the high-pressure gas cannot enter the pressure accumulation chamber from the intake valve body.

[0008] When the hot melt material is heated and melted, the pilot hole is connected, and the high-pressure gas enters the pressure accumulator to form high pressure and acts on the bottom of the piston. Since the volume of the pressure accumulator is very small and is sealed between the piston seal ring and the main valve body, the gas passing through the pilot hole instantly forms high pressure in the pressure accumulator. This pressure acts on the bottom of the piston. The bottom of the piston is a large-diameter disc shape, and its area is much larger than the cross-sectional area of ​​the intake hole of the intake valve body. According to the pressure formula (F = P × A), a huge upward thrust will be generated. Under the action of the thrust, the piston pulls the shear groove of the intake valve body. The thickness of the shear groove is determined by the high-pressure gas pressure and the diameter of the intake hole. When the valve body is closed, it can withstand high pressure reliably without breaking. When subjected to a piston pulling force that is more than ten times the initial pressure, the intake valve body will instantly shear and break along the axial direction. The piston slides upward under the combined action of the high-pressure gas and the compression spring, and stops after resisting the exhaust valve body. The high-pressure gas in the intake valve body flows into the exhaust valve body through the exhaust channel, thereby opening up the main gas path of the valve. The compression spring can effectively prevent the piston from rebounding and blocking the air path. At this time, the intake valve body, the main valve body and the exhaust valve body form a sealed air path.

[0009] In the above scheme, specifically, the annular end face of the intake valve body is provided with upper and lower protrusions, the annular shear groove is arranged around the root of the upper protrusion, and the upper protrusion is also provided with a transverse through hole; an intake hole is provided at the center of the lower protrusion of the intake valve body, and a stepped shrinkage hot melt groove and a pilot hole are provided between the intake hole and the transverse through hole of the upper protrusion of the intake valve body; a lead groove is provided in the annular end face of the intake valve body.

[0010] In the above solution, specifically, the ceramic heater is arranged in the hot melt tank, and the cable of the ceramic heater is led out through the pilot hole, the transverse through hole, the shear groove, and the lead groove. The hot melt tank and the pilot hole are sealed after the hot melt material is condensed.

[0011] In the above scheme, specifically, the piston is threadedly connected to the upper protrusion of the intake valve body, a compression spring is provided between the piston and the upper protrusion, and two semi-annular limit bosses are provided on the lower end face of the piston; a pressure storage chamber is formed between the lower end face of the piston and the annular end face of the intake valve body, and a limit groove is provided on the upper end face of the piston; the diameter of the piston is much larger than the diameter of the shear groove.

[0012] In the above scheme, specifically, the lower end of the air release valve body is provided with an air release channel with a circumferential interval, and a piston limit block is provided below the air release channel; the air release channel is connected to the air outlet hole in the center of the air release valve body; and a filter screen is provided in the air outlet hole.

[0013] Beneficial effects:

[0014] (1) The present invention is in an absolutely sealed state before being opened, and there is no risk of gas leakage and accidental valve opening. After the pilot hole is opened, the pressure of the stored high-pressure gas is used as the power source for opening the valve. The area of ​​the upper valve body increases sharply, forming a huge pulling force, which is far greater than the force required to shear the material, and the valve can be opened stably with low power consumption.

[0015] (2) The compression spring in the present invention can effectively prevent the piston from rebounding and blocking the gas path.

[0016] (3) In the present invention, the piston is provided with a limiting boss to ensure that the piston and the intake valve do not fit completely together, and the high-pressure gas flowing in through the pilot hole can smoothly enter the pressure accumulation chamber.

[0017] (4) In the present invention, the ceramic heater needs to be heated to the working temperature for a certain period of time, so it is not sensitive to false triggering and has a high fault tolerance rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the structure of the present invention;

[0019] Figure 2 It is a structural schematic diagram of the intake valve body in the present invention;

[0020] Figure 3 It is a structural schematic diagram of the piston in the present invention;

[0021] Figure 4 It is a structural schematic diagram of the air relief valve body in the present invention;

[0022] Figure 5 It is a schematic diagram of the storage state of the present invention;

[0023] Figure 6 This is a pilot airflow diagram. The ceramic heater has been hidden to clearly show the airflow path.

[0024] Figure 7 This is a schematic diagram of the valve open state. The ceramic heater has been hidden to clearly show the airflow path.

[0025] In the figure: 1-intake valve body; 1.1-shear groove; 1.2-pilot hole; 1.3-hot melt groove; 1.4-intake hole; 1.5-lead groove; 2-ceramic heater; 3-hot melt material; 4-piston; 4.1-limiting boss; 5-compression spring; 6-piston sealing ring; 7-main valve body; 8-air relief valve body; 8.1-piston limiting block; 8.2-air relief channel; 8.3-filter screen; 8.4-air outlet; 9-valve body sealing ring; 10-pressure storage chamber. DETAILED DESCRIPTION

[0026] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0027] See attached Figure 1 A pilot-operated high-pressure shear valve comprises an intake valve body 1, a piston 4, a main valve body 7 and a relief valve body 8.

[0028] The upper and lower end surfaces of the main valve body 7 are provided with end O-ring grooves, with a valve body sealing ring 9 installed inside. The lower end surface is connected to the intake valve body 1 by screws, and the upper end surface is connected to the exhaust valve body 8 by screws; the main valve body 7, the intake valve body 1 and the exhaust valve body 8 form a sealed cavity structure.

[0029] See attached Figure 2 The annular end face of the intake valve body 1 is provided with upper and lower protrusions, an annular shear groove 1.1 is arranged around the root of the upper protrusion, and the upper protrusion is also provided with a transverse through hole; an intake hole 1.4 is provided at the center of the lower protrusion of the intake valve body 1, and a stepped shrinkage hot melt groove 1.3 and a pilot hole 1.2 are provided between the intake hole 1.4 and the transverse through hole of the upper protrusion of the intake valve body 1; a lead groove 1.5 is provided in the annular end face of the intake valve body 1.

[0030] The ceramic heater 2 is arranged in the hot melt groove 1.3, and the cable of the ceramic heater 2 is led outward through the pilot hole 1.2, the transverse through hole, the shear groove 1.1, and the lead groove 1.5. The hot melt groove 1.3 and the pilot hole 1.2 are sealed after the hot melt material 3 is condensed.

[0031] See attached Figure 3 The piston 4 is threadedly connected to the upper protrusion of the intake valve body 1, a compression spring 5 is arranged between the piston 4 and the upper protrusion, and two semi-annular limiting bosses 4.1 are arranged on the lower end face of the piston 4; a pressure storage chamber 10 is formed between the lower end face of the piston 4 and the annular end face of the intake valve body 1, and a limiting groove is arranged on the upper end face of the piston 4; the diameter of the piston 4 is much larger than the diameter of the shear groove 1.1. The piston 4 and the main valve body 7 are radially sealed by a piston sealing ring 6.

[0032] See attached Figure 4 The lower end of the air release valve body 8 is provided with an air release channel 8.2 with a circumferential interval, and a piston limit block 8.1 is provided below the air release channel 8.2; the air release channel 8.2 is connected to the air outlet hole 8.4 in the center of the air release valve body 8; and a filter screen 8.3 is provided in the air outlet hole 8.4.

[0033] See attached Figure 5 The pilot hole 1.2 has a very small aperture. In the storage state, the hot melt material 3 fills and blocks the hot melt groove 1.3, resulting in the closure of the pilot hole 1.2, and the high-pressure gas is completely sealed in the intake hole 1.4 of the intake valve body 1.

[0034] See attached Figure 6 , 7In the working state, after the ceramic heater 2 is powered on, the internal heating wire is heated to hundreds of degrees Celsius, the hot melt material 3 is melted by the heat, the pilot hole gas path is connected, and the high-pressure gas enters the pressure accumulation chamber between the intake valve body 1 and the piston 4. The pressure accumulation chamber is a round pancake-shaped space with a large diameter and a thin thickness. Its diameter is consistent with the diameter of the piston 4, and its thickness is consistent with the height of the semi-annular limit boss of the piston 4. For details on the gas flow direction, see Figure 6 . Since the volume of the pressure accumulator is very small and it is sealed by the piston seal ring 6, the gas passing through the pilot hole instantly forms high pressure in the pressure accumulator. The pressure acts on the bottom of the piston 4. The bottom of the piston is in the shape of a large diameter disc, and its area is much larger than the cross-sectional area of ​​the intake hole of the intake valve body. According to the pressure formula F=P×A, a huge upward thrust will be generated. Under the action of the thrust, the piston 4 pulls the intake valve body 1 to shear the groove. The thickness of the shear groove is determined by the high-pressure gas pressure and the diameter of the intake hole. When the valve body is closed, it can withstand high pressure reliably without breaking. When subjected to a piston pulling force that is more than ten times the initial pressure, the intake valve body will instantly shear and break along the axial direction. The piston 4 slides upward under the combined action of the high-pressure gas and the compression spring, and stops after resisting the piston limit block of the exhaust valve body 8. The high-pressure gas in the intake valve body flows into the exhaust valve body through the exhaust channel, thereby opening up the main gas path of the valve. The compression spring can effectively prevent the piston from rebounding and blocking the gas path. At this time, the intake valve body 1, the main valve body 7 and the exhaust valve body 8 form a sealed gas path. The gas flow direction is detailed in Figure 7 .

[0035] Although the present invention has been described in detail above by general description and specific embodiments, it is obvious to those skilled in the art that some modifications or improvements can be made to the present invention. Therefore, these modifications or improvements made without departing from the spirit of the present invention all belong to the scope of protection claimed by the present invention.

Claims

1. A pilot-operated high-pressure shear valve, characterized in that: include: An intake valve body (1), a piston (4), a main valve body (7) and an exhaust valve body (8); The main valve body (7) is connected to the air intake valve body (1) and the air discharge valve body (8) to form a sealed cavity structure; The piston (4) is threadedly connected to the intake valve body (1), with a compression spring (5) disposed therebetween; a round-shaped pressure storage chamber (10) is disposed between the piston (4) and the intake valve body (1); and a radial seal is formed between the piston (4) and the main valve body (7); The air intake valve body (1) is provided with a pilot hole (1.2) and an annular shear groove (1.1) which are sealed by condensation of a hot-melt material (3); in a storage state, high-pressure gas cannot enter the pressure accumulation chamber (10) from the air intake valve body (1); When the hot-melt material (3) is heated and melted, the pilot hole (1.2) is opened, and the high-pressure gas enters the pressure storage chamber (10) to form a high pressure acting on the bottom of the piston (4). Under the action of the thrust, the piston (4) pulls the shear groove (1.1) of the intake valve body (1), and the intake valve body (1) is sheared and broken along the axial direction. The piston (4) slides upward under the action of the high-pressure gas and the compression spring (5), and the seal between the piston (4) and the main valve body (7) is released. The high-pressure gas flows into the exhaust valve body (8) through the cavity in the main valve body (7), forming a sealed gas path.

2. A pilot-operated high-pressure shear valve according to claim 1, characterized in that: The annular end surface of the intake valve body (1) is provided with upper and lower protrusions, an annular shear groove (1.1) is arranged around the root of the upper protrusion, and the upper protrusion is also provided with a transverse through hole; an intake hole (1.4) is provided at the center of the lower protrusion of the intake valve body (1), and a stepped shrinkage hot melt groove (1.3) and a pilot hole (1.2) are provided between the intake hole (1.4) and the transverse through hole of the upper protrusion of the intake valve body (1); and a guide wire groove (1.5) is provided in the annular end surface of the intake valve body (1).

3. A pilot-operated high-pressure shear valve as claimed in claim 2, characterized in that: The ceramic heater (2) is arranged in the hot melting tank (1.3), and the cable of the ceramic heater (2) is led outward through the guide hole (1.2), the transverse through hole, the shear groove (1.1), and the lead groove (1.5); The hot melt groove (1.3) and the pilot hole (1.2) are sealed after the hot melt material (3) is condensed.

4. A pilot-operated high-pressure shear valve according to claim 2 or 3, characterized in that: The piston (4) is threadedly connected to the upper protrusion of the intake valve body (1); a compression spring (5) is provided between the piston (4) and the upper protrusion; the lower end surface of the piston (4) is provided with two semi-annular limiting bosses (4.1); a pressure storage chamber (10) is formed between the lower end surface of the piston (4) and the annular end surface of the intake valve body (1); and a limiting groove is provided on the upper end surface of the piston (4); the diameter of the piston (4) is much larger than the diameter of the shear groove (1.1).

5. A pilot-operated high-pressure shear valve as claimed in claim 4, characterized in that: The lower end of the air relief valve body (8) is provided with an air relief channel (8.2) spaced circumferentially, and a piston limit block (8.1) is provided below the air relief channel (8.2); the air relief channel (8.2) is connected to an air outlet hole (8.4) at the center of the air relief valve body (8); and a filter screen (8.3) is provided in the air outlet hole (8.4).

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