Wide-range electric explosion valve with bidirectional unloading function

Abstract

The invention provides a wide-range electric explosion valve with a bidirectional unloading function, and belongs to the technical field of safety valves, the wide-range electric explosion valve comprises a gland, a cutting part, an actuating plug, a shell, an adjusting screw ring and an electric explosion tube, thrust generated by the electric explosion tube acts on the actuating plug, the actuating plug is stressed to move to shear the cutting part, a gas passage is formed in the valve, and high-pressure gas flows out. The electric explosion valve is compact in structure, unloading is achieved according to the pressure counteracting principle, the independent cutting piece is structurally used, bidirectional unloading of an inlet and an outlet is achieved, function exchange of the inlet and the outlet of the electric explosion valve can be achieved, the error prevention function in the operation and use process is added, and the safety is improved. And the electric explosion valve has the capability of adapting to large-span working pressure by simply replacing serialized independent parts, so that the reliability of products under different working pressures is ensured.

Description

Technical Field

[0001] The invention belongs to the technical field of safety valves, and in particular relates to a wide-range electric explosion valve with a two-way unloading function. Background Art

[0002] The electric explosion valve is a valve that uses the electric explosion of an electric explosion tube to generate high-pressure gas to drive the shear mechanism to move, so that the cutting parts are cut off, thereby controlling the opening or closing of the flow channel. It has the characteristics of light weight, small size, fast response, good sealing performance, etc., and is widely used in the field of fluid control.

[0003] However, with the development of technology, the requirements for the functions and indicators of electric explosion valves are getting higher and higher. In the same system, the pressure indicator requirements are complex, ranging from a minimum of several MPa to a maximum of tens of MPa or even hundreds of MPa. The different working pressures lead to different forces on the shear mechanism in the electric explosion valve, thereby reducing the structural reliability of the electric explosion valve. The electric explosion valve is connected to the system pipeline. Before it works, it often participates in the high-pressure environment upstream or downstream of the system. The high pressure is not good for the shear mechanism in the electric explosion valve, thereby reducing the structural reliability of the electric explosion valve.

[0004] The electric explosion valve for opening gas cylinders with application number 202210904470.5 is an electric explosion valve in the prior art. This electric explosion valve has the problem of no unloading components after high pressure is introduced into the outlet, which will damage the cutting parts and affect the structural reliability of the electric explosion valve. The high-pressure unloading normally closed electric explosion valve with application number 202210662163.0 is another electric explosion valve in the prior art. This electric explosion valve solves the unloading problem during the air tightness inspection at the outlet and can work at pressures above 40MPa, but lacks adjustable parts that can adapt to changes in the pressure range, affecting the structural reliability under large-span working pressures. Summary of the invention

[0005] The technical problem solved by the present invention is to provide a wide-range electric explosion valve with a two-way unloading function, which utilizes the pressure offset principle to achieve unloading, solves the problem that the existing electric explosion valve cannot meet the working pressure of a large span and the problem of reduced structural reliability caused by the high-pressure load at the inlet or outlet of the electric explosion valve.

[0006] The technical solution adopted by the present invention is: a wide-range electric explosion valve with a two-way unloading function, including a gland, a cutting piece, an actuating plug, a shell, an adjusting screw ring and an electric explosion tube, the gland is provided with an external pipe nozzle at one axial end, and the other end is a threaded structure for connecting with a thread at one end of the shell, the cutting piece is an unequal diameter cylinder, the diameter of the cylinder on one side is D, the diameter of the cylinder on the other side is d, the diameter of the cylinder in the middle section is A, and A>D>d, the cylinder with a diameter of A of the cutting piece is located inside the connection between the gland and the shell, the cutting piece isolates the internal cavity of the gland and the shell into two independent cavities, wherein the internal cavity of the gland is a first air cavity, and the internal cavity of the shell is a second air cavity, the cutting piece cylinder An inner thread is arranged along the axial direction on one end face with a diameter of d, which is used for threaded connection with the actuating plug. A sealing structure is arranged circumferentially on the other end of the actuating plug. The adjusting screw ring is adjacent to the end of the actuating plug away from the cutting piece. The outer circumference of the adjusting screw ring is processed with threads. The shell is a "T"-shaped structure with three ends, which is processed internally into a special-shaped cavity. One end of the shell is an outer thread end along the axial direction, which is used for threaded connection with the pressure cover; the other end is an inner thread end along the axial direction, which is used for installing the adjusting screw ring and connecting the electric squib; the third end is an external pipe nozzle end perpendicular to the axial direction; the second air cavity is arranged along the axial direction, one end is a cylindrical cavity with a diameter of d, and the other end is a cavity with a diameter of D 0 The cylindrical cavity of the two cylindrical cavities is transitioned by a cone surface, and D 0 >d, the outer pipe nozzle end of the shell perpendicular to the axis passes through the second air cavity.

[0007] Preferably, a sealing tooth-shaped structure is provided in the middle of the actuating plug, which is used to deform and seal after contacting the conical surface of the inner cavity of the shell after actuation.

[0008] The beneficial effects of the present invention are as follows: the present invention has a compact structure, utilizes the pressure offset principle to achieve unloading, uses independent cutting parts in the structure to meet the two-way unloading of the inlet and outlet, can realize the functional interchangeability of the inlet and outlet of the electric explosion valve, and has the functions of sealing and unloading at the same time, adding the error prevention function during operation and use, and by simply replacing the serialized independent parts, the electric explosion valve has the ability to adapt to a large span of working pressure, thereby ensuring the reliability of the product under different working pressures. After the electric explosion valve is installed in the system, it can be tested for high pressure sealing in two directions without the risk of damaging the cutting parts, thereby improving the reliability of the electric explosion valve structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 This is a schematic diagram of the structure of the electric explosion valve before working.

[0010] Figure 2 This is a schematic diagram of the structure of the electric explosion valve after working.

[0011] Figure 3 It is a schematic diagram of the structure of the cut parts.

[0012] Figure 4 It is a schematic diagram of the force on the cutting piece when the first air cavity is ventilated.

[0013] Figure 5 This is a schematic diagram of the force on the cutting piece when the second air cavity is ventilated.

[0014] Figure 6 It is a schematic diagram of the shell structure.

[0015] Figure 7 Schematic diagram of adjusting the spiral ring structure.

[0016] Figure numerals: 1-pressure cover, 2-cutting piece, 3-actuating plug, 4-housing, 5-adjusting screw ring, 6-electric detonator, 7-first air cavity, 8-second air cavity. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0018] like Figure 1 and Figure 2 As shown, a wide-range electric explosion valve with a two-way unloading function includes a gland 1, a cutting piece 2, an actuating plug 3, a shell 4, an adjusting screw ring 5 and an electric explosion tube 6. The thrust generated by the electric explosion tube 6 acts on the actuating plug 3, and the actuating plug 3 moves under force to shear the cutting piece 2, forming a gas passage in the valve, and high-pressure gas flows out. The gland 1 is provided with an external pipe nozzle at the left end along the axial direction, and the right end is a threaded structure for connecting with the thread at the left end of the shell 4. Figure 3 As shown, the cutting piece 2 is a cylinder of unequal diameters, the diameter of the left cylinder is D, the diameter of the right cylinder is d, the diameter of the middle section cylinder is A, the thickness at the cylinder diameter D is L, the thickness at the cylinder diameter A is the structural thickness t, the cylinder of the cutting piece 2 with a diameter of A is located inside the connection between the gland 1 and the shell 4, the cutting piece 2 isolates the internal cavities of the gland 1 and the shell 4 into two independent cavities, wherein the internal cavity of the gland 1 is the first air cavity 7, and the internal cavity of the shell 4 is the second air cavity 8, an end face of one side of the cylinder of the cutting piece 2 with a diameter of d is axially provided with an internal thread for threaded connection with the actuating plug 3, the other end of the actuating plug 3 is circumferentially provided with a sealing structure, the adjusting screw ring 5 is adjacent to the end of the actuating plug 3 away from the cutting piece 2, and the outer circumference of the adjusting screw ring 5 is processed with a thread.

[0019] like Figure 6As shown, the shell 4 is a "T"-shaped structure with three ends, the left end of the shell 4 is an external thread end along the axial direction, which is used for threaded connection with the gland 1; the right end is an internal thread end along the axial direction, which is used for installing the adjustment screw ring 5 and connecting the electric explosion tube 6; the third end is an external nozzle end perpendicular to the axial direction; the inner cavity of the shell 4 has a diameter of d on the left side along the axial direction, and the cutting piece is installed at this end, and the diameter on the right side is D 0 The adjusting screw ring 5 and the electric squib 6 are installed at the end, the connecting parts of the inner cavities on the left and right sides of the shell 4 along the axial direction are conical transitions, and the external pipe nozzle end of the shell 4 perpendicular to the axial direction passes through the second air cavity 8. The sealing structure of the actuating plug 3 is a sealing tooth-shaped structure, which is used to deform and seal after contacting the conical surface of the inner cavity of the shell 4 after actuation.

[0020] The cutting piece 2 is a serially replaceable part, in which D and d remain unchanged. The raw material, structural thickness t and thickness L of the cutting piece 2 exist in a serial combination. The unloading function can be achieved by selecting and installing the cutting piece 2 of the corresponding specification, such as Figure 4 As shown, when the first air cavity 7 is introduced with high-pressure gas, the front end surface of the cutting piece 2 in contact with the first air cavity 7 is subjected to a pressure of F1, and the rear end surface of the cutting piece 2 in contact with the shell 4 is a fixed support surface. The shearing section of the cutting piece 2 is the section at the diameter d and the thickness L. The shearing section can withstand a shearing force of F2. When designed, F2>F1, and the cutting piece 2 cannot be destroyed under the pressure of F1. Therefore, the first air cavity 7 has a load-unloading function. With the change of the higher pressure value of the first air cavity 7, by replacing the cutting piece 2 with a larger L value, F2>F1 is always made, so that a series of cutting pieces 2 are formed to realize the load-unloading function of the first air cavity 7; Figure 5 As shown, when the second air cavity 8 is introduced with high pressure gas, the cutting member 2 and the actuating plug 3 are connected by threads, and the whole of the two is regarded as a force-bearing object. By matching the dimensions D and d of the cutting member 2 and the inner cavity dimension D of the housing 4 during design, 0 The end surface of the actuating plug 3 in the second air cavity 8 is subjected to a pressure of f1, and the end surface of the cutting piece 2 in the second air cavity 8 is subjected to a pressure of f2. By selecting the specifications of the installed cutting piece 2, f1-f2=F1 can be achieved, which can achieve the same Figure 4 The same structural stress, that is, the second air cavity 8 has a unloading function, and the unloading degree is the same as that of the first air cavity 7. In this way, the two interfaces of the external pipe nozzle at the gland 1 and the external pipe nozzle at the axial end of the shell 4 can be the air inlet and the air outlet of each other, and have the functions of sealing and unloading at the same time, adding an error-proof function during operation and use, and enabling the electric explosion valve to be installed in the system to perform high-pressure sealing tests in two directions without risk of damage to the cutting piece 2, thereby improving the reliability of the electric explosion valve structure. During use, according to the pressure value of the use environment of the electric explosion valve, it is only necessary to simply replace the cutting piece 2 and the adjusting screw ring 5 that can adapt to the corresponding pressure, and it can be used under different pressure conditions with a large span.

[0021] like Figure 7 As shown, the adjusting screw ring 5 is a structural serialized replaceable part, wherein the specification of the external thread remains unchanged, and is used to connect with the internal thread of the housing 4 along the axial end. There is a serialized combination of the structural thickness and the inner hole diameter. By selecting the adjusting screw ring 5 with the appropriate structural thickness and inner hole, the volume of the electric explosion valve detonation chamber is changed to achieve the change of the detonation pressure. When the working pressure of the electric explosion valve is increased, the reaction force acting on the shear mechanism of the electric explosion valve increases, that is, a larger detonation force of the electric explosion tube 6 is required, but the pressure output per unit volume of the same model of electric explosion tube 6 is a fixed value. Therefore, the present invention changes the detonation pressure by changing the structural size of the adjusting screw ring 5, thereby indirectly changing the volume of the detonation chamber of the electric explosion valve. For example, if you want to reduce the volume of the detonation chamber, replace an adjusting screw ring 5 with a larger structural thickness and a smaller inner hole to reduce the volume of the detonation chamber and obtain a larger detonation pressure. When detonating, according to the shear force working principle of the electric explosion valve cutting piece 2, the end face of the cutting piece 2 in contact with the pressure cover 1 is a fixed support surface, and the shear section of the cutting piece 2 is the section at the diameter D and the structural thickness t. In order to better adapt to the change of the detonation chamber volume caused by the adjustment screw ring 5 structure, the structural thickness t of the cutting piece 2 can be compensated and adjusted so that the structure of the cutting piece 2 and the structure of the adjustment screw ring 5 match one by one.

[0022] The above are specific embodiments of the present invention and the technical principles used. Any modifications and equivalent changes based on the technical solution of the present invention should be included in the protection scope of the present invention.

Claims

1. A wide-range electric explosion valve with two-way unloading function, characterized in that: It includes a gland, a cutting piece, an actuating plug, a shell, an adjusting screw ring and an electric squib. The gland is provided with an external pipe nozzle at one axial end and a threaded structure at the other end for threaded connection with one end of the shell. The cutting piece is an unequal diameter cylinder, with a cylinder diameter of D on one side and d on the other side, a cylinder diameter of A in the middle section, and A>D>d. The cylinder with a diameter of A of the cutting piece is located inside the connection between the gland and the shell. The cutting piece isolates the internal cavities of the gland and the shell into two independent cavities, wherein the internal cavity of the gland is a first air cavity, and the internal cavity of the shell is a second air cavity. An internal thread is provided on one end face of the cutting piece with a cylinder diameter of d along the axial direction for threaded connection with the actuating plug. The other end face of the actuating plug A sealing structure is provided circumferentially at one end, the adjusting screw ring is adjacent to the end of the actuating plug away from the cutting piece, the outer circumference of the adjusting screw ring is processed with threads, and the shell is internally processed into a special-shaped cavity with a "T"-shaped structure with three ends. One end of the shell is an external threaded end along the axial direction, which is used for threaded connection with the pressure cover; the other end is an internal threaded end along the axial direction, which is used for installing the adjusting screw ring and connecting the electric detonator; the third end is an external pipe nozzle end perpendicular to the axial direction; the second air cavity is arranged along the axial direction, one end is a cylindrical cavity with a diameter of d, and the other end is a cylindrical cavity with a diameter of D0, the two cylindrical cavities are transitioned by a conical surface in the middle, and D0>d, and the external pipe nozzle end of the shell perpendicular to the axial direction passes through the second air cavity.

2. A wide-range electric explosion valve with bidirectional unloading function according to claim 1, characterized in that: The sealing structure of the actuating plug is a sealing tooth-shaped structure, which is used to deform and seal after contacting the conical surface of the second air cavity after actuation.

Images