A pilot operated high pressure shear valve

Abstract

The present application belongs to the technical field of valve manufacturing, and particularly relates to an electrically heated starting valve. The technical scheme of a pilot high-pressure shear valve comprises an air inlet valve body, a piston, a main valve body and an air outlet valve body; the air inlet valve body is provided with a pilot hole sealed by condensed hot melt material and a ring-shaped shear groove; in a storage state, high-pressure gas cannot enter a pressure accumulation chamber from the air inlet valve body; when the hot melt material is heated and melted, the pilot hole is conducted, high-pressure gas enters the pressure accumulation chamber to form high-pressure acting on the bottom of the piston, the piston pulls the shear groove of the air inlet valve body under the action of the thrust force, the air inlet valve body is sheared and broken along the axial direction, the piston slides upward under the action of the high-pressure gas and the compression spring, the seal between the piston and the main valve body is removed, the high-pressure gas flows into the air outlet valve body through the cavity in the main valve body to form a sealed air path. The present application is in an absolutely sealed state before being opened, and there is no risk of gas leakage and accidental opening of the valve; after the pilot hole is opened, the valve can be stably opened, and the required power consumption is low.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of valve manufacturing, and particularly relates to an electric heating starting valve. BACKGROUND

[0002] The high-pressure valves currently used in the industry are mostly electromagnetic valves and electric explosion valves. The electromagnetic valve realizes valve sealing through a rubber sealing element. The long-term storage of the sealing material is prone to aging and air leakage. Moreover, the electromagnetic valve with high-pressure resistance is heavy in weight. The electric explosion valve can ensure long-term storage sealing, but involves a detonator, which requires high requirements for warehouse management and transportation and is high in cost. Therefore, in the case of long-term storage with high pressure and the inability to use a detonator, an electric heating starting valve with absolute sealing before opening has greater advantages. SUMMARY

[0003] The application aims to provide a pilot high-pressure shear valve according to the use requirements.

[0004] The technical scheme of the application is as follows: a pilot high-pressure shear valve comprises an air inlet valve body, a piston, a main valve body and an air release valve body.

[0005] The main valve body is connected to the air inlet valve body and the air release valve body to form a sealed cavity structure. The contact surfaces of the main valve body, the air inlet valve body and the air release valve body are respectively provided with valve body sealing rings.

[0006] The piston is threadedly connected to the air inlet valve body and is provided with a compression spring therebetween. A circular pie-shaped pressure accumulation chamber is arranged between the piston and the air inlet valve body. The piston and the main valve body are radially sealed.

[0007] The air inlet valve body is provided with a pilot hole sealed by condensation of hot melt material and a ring-shaped shear groove. 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 air inlet hole of the air inlet valve body. The high-pressure gas cannot enter the pressure accumulation chamber from the air inlet valve body.

[0008] When the hot melt material is heated and melted, the pilot hole is connected, the high-pressure gas enters the pressure accumulation chamber to form high pressure on the bottom of the piston, because the volume of the pressure accumulation chamber is very small, and the gas passing through the piston sealing ring and the main valve body is sealed, the gas passing through the pilot hole forms high pressure in the pressure accumulation chamber, the pressure acts on the bottom of the piston, the bottom of the piston is a large-diameter disc shape, the area is much larger than the cross-sectional area of the inlet valve body gas hole, 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 inlet valve body. The thickness of the shear groove is determined by the high-pressure gas pressure and the diameter of the gas hole. When the valve body is closed, it can withstand high pressure and not break. When the piston tension is ten times the initial pressure, the inlet valve body will be instantaneously sheared and broken in the axial direction. The piston slides upward under the joint action of high-pressure gas and compression spring, and stops moving against the air release valve body. The high-pressure gas in the inlet valve body flows into the air release valve body through the air release channel, thereby opening 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 inlet valve body, the main valve body and the air release valve body form a sealed gas path channel.

[0009] In the above scheme, specifically, the annular end face of the inlet 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 further provided with a transverse through hole; the center of the lower protrusion of the inlet valve body is provided with an air inlet hole, and the air inlet hole and the transverse through hole of the upper protrusion of the inlet valve body are provided with a stepped shrinkage hot melt groove and a pilot hole; a lead slot is arranged in the annular end face of the inlet valve body.

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

[0011] In the above scheme, specifically, the piston is threadedly connected with the upper protrusion of the inlet valve body, the compression spring is arranged between the piston and the upper protrusion, the lower end face of the piston is provided with two semi-annular limiting bosses, the annular end face of the inlet valve body is provided with a piston limiting block, and the lower end face of the piston is provided with a limiting groove.

[0012] In the above scheme, specifically, the lower end of the air release valve body is provided with circumferentially spaced air release channels, and a piston limiting block is arranged below the air release channels; the air release channels are in communication with the air outlet hole at the center of the air release valve body; a filter screen is arranged in the air outlet hole.

[0013] Advantages:

[0014] (1) The invention is in an absolute sealed state before opening, without gas leakage and accidental opening risk; after the pilot hole is opened, the stored high pressure gas is used as the valve opening power source, the upper valve body area increases sharply, forming a huge pulling force, much larger than the force required to shear the material, which can stably open the valve, and the required power consumption is low.

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

[0016] (3) The piston in the invention is provided with a limiting boss, which ensures that the piston and the inlet valve cannot be completely attached, and the high pressure gas flowing through the pilot hole can smoothly enter the pressure accumulation chamber.

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

[0018] Figure 1 is a structural schematic diagram of the invention;

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

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

[0021] Figure 4 is a structural schematic diagram of the gas release valve body in the invention;

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

[0023] Figure 6 is a pilot gas flow schematic diagram, the ceramic heater has been hidden for clear display of the gas flow path;

[0024] Figure 7 is an open valve state schematic diagram, the ceramic heater has been hidden for clear display of the gas flow path.

[0025] In the figure: 1-inlet valve body; 1.1-shear groove; 1.2-pilot hole; 1.3-hot melt groove; 1.4-inlet hole; 1.5-lead-in 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-gas release valve body; 8.1-piston limiting block; 8.2-gas release channel; 8.3-filter screen; 8.4-outlet hole; 9-valve body sealing ring; 10-pressure accumulation chamber. DETAILED DESCRIPTION

[0026] The invention will be further described in detail below in combination with the drawings and examples.

[0027] Referring to the drawingsFigure 1 A pilot high pressure shear valve comprises: an air inlet valve body 1, a piston 4, a main valve body 7 and an air outlet valve body 8.

[0028] The main valve body 7 is provided with an O-ring groove on the upper and lower end faces, and is internally provided with a valve body sealing ring 9. The lower end face is connected to the air inlet valve body 1 by a screw, and the upper end face is connected to the air outlet valve body 8 by a screw. The main valve body 7, the air inlet valve body 1 and the air outlet valve body 8 form a sealed cavity structure.

[0029] Referring to the accompanying drawings Figure 2 The annular end face of the air inlet valve body 1 is provided with upper and lower protrusions, and a circumferential shear groove 1.1 is arranged around the root of the upper protrusion. The upper protrusion is also provided with a transverse through hole. The air inlet valve body 1 is provided with an air inlet hole 1.4 at the center of the lower protrusion. The air inlet hole 1.4 and the transverse through hole of the upper protrusion of the air inlet valve body 1 are provided with a heat melting groove 1.3 and a pilot hole 1.2 in a stepped contraction manner. A lead groove 1.5 is arranged in the annular end face of the air inlet valve body 1.

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

[0031] Referring to the accompanying drawings Figure 3 The piston 4 is threadedly connected to the upper protrusion of the air inlet valve body 1, and a compression spring 5 is arranged between the piston 4 and the upper protrusion. The lower end face of the piston 4 is provided with two semi-annular limiting bosses 4.1. The lower end face of the piston 4 and the annular end face of the air inlet valve body 1 form a pressure accumulation chamber 10. The upper end face of the piston 4 is provided with a limiting clamping groove. 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] Referring to the accompanying drawings Figure 4 The lower end of the air outlet valve body 8 is provided with circumferentially spaced air outlet channels 8.2, and piston limiting blocks 8.1 are arranged below the air outlet channels 8.2. The air outlet channels 8.2 are in communication with an air outlet hole 8.4 at the center of the air outlet valve body 8. A filter screen 8.3 is arranged in the air outlet hole 8.4.

[0033] Referring to the accompanying drawings Figure 5 The pilot hole 1.2 has a very small diameter. In the storage state, the heat melting material 3 fills and blocks the heat melting groove 1.3, causing the pilot hole 1.2 to be closed, and the high pressure gas is completely sealed in the air inlet hole 1.4 of the air inlet valve body 1.

[0034] Referring to the accompanying drawings Figure 6 , 7In the working state, the ceramic heater 2 is powered, the internal heating wire is heated to several hundred degrees Celsius, the hot melt material 3 is heated and melted, the pilot hole gas path is connected, the high-pressure gas enters the pressure accumulation chamber between the inlet valve body 1 and the piston 4, the pressure accumulation chamber is a circular cake-shaped space with large diameter and thin thickness, the diameter is consistent with the diameter of the piston 4, and the thickness is consistent with the height of the semi-annular limiting boss of the piston 4, and the gas flow direction is shown in Figure 6 . Due to the small volume of the pressure accumulation chamber and the sealing of the piston sealing ring 6, the gas passing through the pilot hole forms high pressure in the pressure accumulation chamber in an instant, the pressure acts on the bottom of the piston 4, the bottom of the piston 4 is in the shape of a large-diameter disc, and the area is much larger than the cross-sectional area of the inlet valve body inlet hole, 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 shearing groove of the inlet valve body 1. The thickness of the shearing groove is determined by the high-pressure gas pressure and the diameter of the inlet hole, and the inlet valve body can be reliably unbroken when closed under high pressure, and when subjected to tens of times the initial pressure of the piston pulling force, the inlet valve body will be instantaneously sheared and broken in the axial direction. The piston 4 slides upward under the joint action of the high-pressure gas and the compression spring, and stops moving after pressing against the piston limiting block of the exhaust valve body 8, the high-pressure gas in the inlet valve body flows into the exhaust valve body through the exhaust passage, thereby opening 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 inlet valve body 1, the main valve body 7 and the exhaust valve body 8 form a sealed gas path channel, and the gas flow direction is shown in Figure 7 .

[0035] Although the present application has been described in detail above with general description and specific embodiments, some modifications or improvements can be made on the basis of the present application, which is obvious to those skilled in the art. Therefore, these modifications or improvements made on the basis of not deviating from the spirit of the present application, all belong to the scope of the present application claimed.

Claims

1. A pilot operated high pressure shear valve, characterized by, The utility model relates to a kind of high-pressure gas release valve, including: Air inlet valve body (1), piston (4), main valve body (7) and air release valve body (8); Main valve body (7) is connected air inlet valve body (1) and air release valve body (8), and constitutes sealed cavity structure; Piston (4) is threadedly connected with air inlet valve body (1), and pressure spring (5) is arranged therebetween;Piston (4) and air inlet valve body (1) are equipped with pie-shaped pressure accumulation chamber (10);Piston (4) and main valve body (7) are radially sealed; Air inlet valve body (1) is equipped with pilot hole (1.2) sealed by hot melt material (3) condensation and annular shearing groove (1.1);When storage state, high-pressure gas cannot enter pressure accumulation chamber (10) from air inlet valve body (1); When hot melt material (3) is melted by heat, pilot hole (1.2) is conducted, high-pressure gas enters pressure accumulation chamber (10) and forms high-pressure and is acted on the bottom of piston (4), piston (4) pulls shearing groove (1.1) of air inlet valve body (1) under the action of thrust, air inlet valve body (1) is sheared and broken along axial direction, piston (4) slides upwards under the action of high-pressure gas and pressure spring (5), and the seal between piston (4) and main valve body (7) is released, high-pressure gas flows into air release valve body (8) through the inner cavity of main valve body (7), and forms sealed gas path passage.

2. A pilot operated high pressure shear valve as defined in claim 1, wherein, Annular end surface of air inlet valve body (1) is equipped with upper and lower protrusions, and annular shearing groove (1.1) is arranged around the root of upper protrusion, and upper protrusion is further equipped with transverse through hole;Air inlet hole (1.4) is arranged at the center of lower protrusion of air inlet valve body (1), and air inlet hole (1.4) and the transverse through hole of upper protrusion of air inlet valve body (1) are equipped with hot melt groove (1.3) and pilot hole (1.2) of stepped contraction;Lead groove (1.5) is arranged in the annular end surface of air inlet valve body (1).

3. A pilot operated high pressure shear valve as defined in claim 2, wherein, Ceramic heater (2) is arranged in hot melt groove (1.3), and the cable of ceramic heater (2) is led outwards through pilot hole (1.2), transverse through hole, shearing groove (1.1), lead groove (1.5); Hot melt groove (1.3) and pilot hole (1.2) are sealed by hot melt material (3) condensation.

4. A pilot operated high pressure shear valve as claimed in claim 2 or 3, wherein, Piston (4) is threadedly connected with the upper protrusion of air inlet valve body (1), and pressure spring (5) is arranged between piston (4) and upper protrusion, and the lower end surface of piston (4) is equipped with two semicircular limit bosses (4.1);The lower end surface of piston (4) and the annular end surface of air inlet valve body (1) form pressure accumulation chamber (10), and the upper end surface of piston (4) is equipped with limit clamping groove;The diameter of piston (4) is much larger than the diameter of shearing groove (1.1).

5. A pilot operated high pressure shear valve as defined in claim 4, wherein, The lower end of the air release valve body (8) is provided with a circumferentially spaced air release passage (8.2), and a piston limiting block (8.1) is arranged below the air release passage (8.2); The air release passage (8.2) is in communication with the air outlet hole (8.4) at the center of the air release valve body (8); A filter screen (8.3) is arranged in the air outlet hole (8.4).

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