A blasting needle valve

Abstract

The application discloses a burst needle valve. The burst needle valve comprises a valve body, a valve cover, a support member, a pressing plate, a valve plate, a burst needle and a valve rod, the valve body comprises an inlet end and an outlet end, the valve cover is provided with a through hole, the pressing plate and the support member are arranged outside the valve body, the valve plate is arranged inside the valve body, the valve plate is hinged to the valve body, the valve plate is rotatable between a first position and a second position, the valve plate in the first position seals the inlet end so that the inlet end and the outlet end are not communicated, the valve plate in the second position is separated from the inlet end so that the inlet end and the outlet end are communicated, the burst needle is arranged in the support member, one end of the burst needle is abutted against the pressing plate, one end of the valve rod is abutted against the valve plate in the first position, and the other end of the valve rod extends through the through hole and is abutted against the other end of the burst needle. The burst needle valve provided by the application can release pressure and can act without depending on any external energy source, and the release precision is high.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of valves, in particular to a burst needle valve. BACKGROUND

[0002] The burst needle valves commonly used in the market have burst discs and spring safety valves to prevent the pressure of the medium from being too high. These burst needle valves are low in price and widely used, but have the following common shortcomings: 1. low use efficiency, time-consuming and laborious installation and maintenance; 2. poor precision, usually with a control precision of more than ±10%; 3. inconvenient to disassemble and replace, the system needs to be stopped when replacing parts, causing downtime losses; 4. poor fatigue resistance, the valve often fails prematurely due to the lack of fatigue resistance, poor sealing, and unable to work normally. In particular, the existing burst needle valves cannot well prevent the backflow of the medium. Due to the above shortcomings, these safety burst needle valves cannot well meet the market demand.

[0003] Therefore, it is necessary to provide a burst needle valve to at least partially solve the above problems. SUMMARY

[0004] A series of concepts in simplified form are introduced in the summary section, which will be further described in detail in the detailed description section. The summary section of the present application does not mean to attempt to limit the key features and essential technical features of the claimed technical solutions, nor to determine the protection scope of the claimed technical solutions.

[0005] In order to at least partially solve the above problems, according to a first aspect of the present application, a burst needle valve is provided, the burst needle valve comprising:

[0006] a valve body comprising an inlet end and an outlet end;

[0007] a valve cover connected with the valve body and provided with a through hole, a pressing plate and a support member, the pressing plate and the support member are both arranged outside the valve body, and the support member connects the pressing plate and the valve cover;

[0008] a valve plate arranged inside the valve body, the valve plate is hinged with the valve body, and the valve plate is rotatable between a first position and a second position, the valve plate in the first position seals the inlet end so that the inlet end and the outlet end are not communicated, and the valve plate in the second position is separated from the inlet end so that the inlet end and the outlet end are communicated;

[0009] a burst needle arranged in the support member, one end of the burst needle abuts against the pressing plate;

[0010] A valve stem, one end of the valve stem abutting against the valve plate in the first position, the other end of the valve stem extending through the through hole and abutting against the other end of the burst pin.

[0011] According to the burst pin valve of the present application, the burst pin valve comprises a valve body, a valve cover, a support member, a pressing plate, a valve plate, a burst pin and a valve stem, the valve plate is arranged inside the valve body and is hinged to the valve body, the valve plate is rotatable between a first position and a second position, the burst pin is arranged in the support member, one end of the burst pin abutting against the pressing plate, one end of the valve stem abutting against the valve plate in the first position, the other end of the burst pin abutting against the other end of the valve stem, the valve plate in the first position sealing the inlet end so that the inlet end and the outlet end are not communicated, the valve plate in the second position being separated from the inlet end so that the inlet end and the outlet end are communicated. In this way, the burst pin valve provided by the present application can release pressure and can act without relying on any external energy source, has high release precision and reduces the pressure of the medium.

[0012] Optionally, a projection of the valve plate in the second position along at least a part of a first direction coincides with the inlet end and the outlet end, the first direction being perpendicular to the moving direction of the valve stem. In this way, the generation of reverse flow phenomenon is prevented.

[0013] Optionally, the inside of the valve body is further provided with a hinge plate, the valve plate is provided with a rotating arm, and the rotating arm is hinged to the hinge plate. In this way, the valve plate is facilitated to rotate.

[0014] Optionally, the valve body is further provided with a recess and a valve seat, the valve seat is arranged in the recess and the inner diameter surface of the valve seat does not protrude from the inner diameter surface of the inlet end, and the valve plate in the first position is tightly fitted to the valve seat. In this way, the sealing property is improved.

[0015] Optionally, the inner diameter surface of the valve seat comprises a first cylindrical sealing surface and a conical sealing surface, the first cylindrical sealing surface being connected to the conical sealing surface along the circumferential direction of the valve seat, and the first cylindrical sealing surface and the conical sealing surface are both tightly fitted to the valve plate in the first position. In this way, the sealing property is improved and the opening resistance of the valve plate is low.

[0016] Optionally, the inner diameter surface of the valve seat further comprises a second cylindrical sealing surface, the second cylindrical sealing surface being connected to the conical sealing surface along the axial direction of the valve seat, the conical sealing surface being upwardly inclined along the axial direction towards the valve plate, and the first cylindrical sealing surface and the second cylindrical sealing surface are flush with the inner diameter surface of the inlet end.

[0017] Optionally, the valve plate is provided with a sealing plate, the sealing plate comprises a first sealing surface and a second sealing surface, the shape of the first sealing surface matches the shape of the first cylindrical sealing surface, the shape of the second sealing surface matches the shape of the conical sealing surface, the first sealing surface in the first position is tightly attached to the first cylindrical sealing surface, and the second sealing surface in the first position is tightly attached to the conical sealing surface. Thereby, the sealing property is improved.

[0018] Optionally, the valve seat further comprises a valve seat side surface connected to the first cylindrical sealing surface and the conical sealing surface, and the valve plate further comprises a valve plate side surface, the valve plate side surface is provided with the sealing plate, and the length of the valve plate side surface is greater than the length of the sealing plate, the valve plate side surface in the first position is tightly attached to the valve seat side surface.

[0019] Optionally, the valve plate is provided with a connecting plate, the connecting plate in the first position extends along a first direction towards the outlet end, the connecting plate in the first position is abutted against the valve rod, and the first direction is perpendicular to the moving direction of the valve rod.

[0020] Optionally, the valve body further comprises an intermediate chamber, the intermediate chamber is used for connecting the inlet end and the outlet end, a part of the intermediate chamber, the inlet end and the outlet end are coaxially arranged along a first direction, the first direction is perpendicular to the moving direction of the valve rod, and another part of the intermediate chamber is provided with the valve rod. BRIEF DESCRIPTION OF DRAWINGS

[0021] The following drawings for the present application are hereby incorporated as a part of the present application for the purpose of understanding the present application. The embodiments of the present application and their description shown in the drawings are used to explain the devices and principles of the present application. In the drawings,

[0022] Figure 1 is a longitudinal sectional view of the burst needle valve according to a preferred embodiment of the present application, wherein the valve plate is in the first position;

[0023] Figure 2 is a longitudinal sectional view of the burst needle valve according to a preferred embodiment of the present application, wherein the valve plate is in the second position;

[0024] Figure 3 is Figure 1 is a schematic view of the burst needle shown in a stable state; and

[0025] Figure 4 is Figure 2 is a schematic view of the burst needle shown in a curved state.

[0026] BRIEF DESCRIPTION OF DRAWINGS

[0027] 100: burst needle valve 110: valve body

[0028] 111: inlet end 112: outlet end

[0029] 113: intermediate valve body 114: connecting portion

[0030] 115: tube portion 116: groove

[0031] 117: valve seat 118: inner diameter surface of the inlet end

[0032] 120: first cylindrical sealing surface 121: conical sealing surface

[0033] 122: second cylindrical sealing surface 123: valve seat side surface

[0034] 124: one portion of the intermediate chamber 125: another portion of the intermediate chamber

[0035] 130: valve cover 131: support member

[0036] 132: pressure plate 133: first connecting member

[0037] 134: second connecting member 135: through hole

[0038] 139: valve plate 140: sealing plate

[0039] 141: first sealing surface 142: second sealing surface

[0040] 143: first valve plate side surface 144: second valve plate side surface

[0041] 145: connecting plate 151: burst needle

[0042] 152: first end of the burst needle 153: second end of the burst needle

[0043] 154: valve stem 155: first end of the valve stem

[0044] 156: second end of the valve stem 161: first sealing member

[0045] 162: second sealing member 163: third sealing member

[0046] 164: hinged plate 165: swing arm

[0047] 166: pin shaft DETAILED DESCRIPTION

[0048] In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the invention. However, it will be apparent to those skilled in the art that the invention can be practiced without one or more of these details. In other instances, certain technical features well-known in the art have not been described in order to avoid obscuring the invention.

[0049] To fully understand the present invention, detailed structures will be presented in the following description to illustrate it. Obviously, the implementation of the present invention is not limited to the specific details familiar to those skilled in the art. Preferred embodiments of the present invention are described in detail below; however, the present invention may have other embodiments besides these detailed descriptions and should not be construed as being limited to the embodiments set forth herein.

[0050] It should be understood that the terminology used herein is intended only to describe particular embodiments and is not intended to limit the invention. The singular forms “a,” “an,” and “the” are also intended to include the plural forms unless the context clearly indicates otherwise. When the terms “comprising” and / or “including” are used in this specification, they indicate the presence of the stated feature, integral, step, operation, element, and / or component, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or combinations thereof. The terms “upper,” “lower,” “front,” “rear,” “left,” “right,” and similar expressions used in this invention are for illustrative purposes only and are not intended to be limiting.

[0051] The ordinal numbers such as "first" and "second" used in this invention are merely identifiers and do not have any other meaning, such as a specific order. Moreover, for example, the term "first component" does not imply the existence of "second component," and the term "second component" does not imply the existence of "first component."

[0052] Hereinafter, specific embodiments of the present invention will be described in more detail with reference to the accompanying drawings, which illustrate representative embodiments of the present invention and are not intended to limit the present invention.

[0053] like Figure 1 and Figure 2 As shown, this invention provides a rupture needle valve 100 for releasing pressure on a medium within a system. The rupture needle valve 100 provided by this invention can be applied to pressure vessels, systems, or other closed systems in petrochemical and chemical plants. The medium within the system can be substances such as petroleum or natural gas. The rupture needle valve 100 provided by this invention can release pressure and can operate without relying on any external energy source.

[0054] Specifically, the burst needle valve 100 includes a valve body 110, a valve cover 130, a support member 131, a pressing plate 132, a valve plate 139, a burst needle 151, and a valve stem 154. The valve body 110 is hollow, and the valve body 110 includes an inlet end 111 and an outlet end 112. The medium can enter the valve body 110 via the inlet end 111. When the pressure of the medium is less than or equal to a set pressure value, the inlet end 111 and the outlet end 112 of the valve body 110 are not in communication. When the pressure of the medium is greater than the set pressure value, the inlet end 111 and the outlet end 112 of the valve body 110 are in communication, and the medium can flow from the inlet end 111 to the outlet end 112, thereby releasing the pressure. The flow of the medium will be described later.

[0055] The longitudinal cross-sectional shape of the valve body 110 can be substantially "convex" to facilitate timely pressure relief. The inlet end 111 and the outlet end 112 of the valve body 110 can each include a connecting portion 114 and a pipe portion 115. The connecting portion 114 can be configured as a flange structure. The connecting portion 114 and the pipe portion 115 can be integrally formed, or the connecting portion 114 and the pipe portion 115 can be threadedly connected or welded together. The central axis of the connecting portion 114 can coincide with the central axis of the pipe portion 115. The pipe portion 115 extends from the inner surface of the connecting portion 114 in the axial direction of the connecting portion 114. The connecting portion 114 is substantially a hollow disc structure to facilitate connection with the pipeline of the system. The inner diameter surface of the connecting portion 114 and the inner diameter surface of the pipe portion 115 are flush to reduce the impact on the flow of the medium.

[0056] Preferably, the central axes of the inlet end 111 of the valve body 110 and the outlet end 112 of the valve body 110 coincide, so that the inlet end 111 of the valve body 110 and the outlet end 112 of the valve body 110 are coaxially arranged, thereby reducing energy loss. The central axes of the connecting portion 114 and the pipe portion 115 coincide with the central axis of the inlet end 111. The inlet end 111 of the valve body 110 and the outlet end 112 of the valve body 110 can be connected by an intermediate valve body 113.

[0057] Specifically, the two pipe portions 115 on both sides of the intermediate valve body 113 in the axial direction of the inlet end 111 of the valve body 110 are connected. The intermediate valve body 113 includes an intermediate chamber for communicating the inlet end 111 and the outlet end 112. When the pressure of the medium is greater than the set pressure value, the medium can flow from the inlet end 111 and the intermediate chamber to the outlet end 112.

[0058] Optionally, the bottom of the intermediate chamber can be configured in an arc shape to facilitate the flow of the medium. A portion 124 of the intermediate chamber is disposed between the inlet end 111 and the outlet end 112 in a first direction D1. In the present embodiment, the "first direction D1" refers to the axial direction of the inlet end 111 of the valve body 110, the outlet end 112 of the valve body 110, and the portion 124 of the intermediate chamber. When the pressure of the medium is greater than the set pressure value, the flow direction of the medium can be parallel to the axial direction of the inlet end 111 of the valve body 110, the outlet end 112 of the valve body 110, and the portion 124 of the intermediate chamber. In order to reduce energy loss, the portion 124 of the intermediate chamber, the inlet end 111, and the outlet end 112 can be coaxially disposed in the first direction D1.

[0059] Another portion 125 of the intermediate chamber is in communication with the portion 124 of the intermediate chamber in a second direction D2. The second direction D2 is perpendicular to the first direction D1. The other portion 125 of the intermediate chamber is open, and a valve cover 130 can be connected to the other portion 125 of the intermediate chamber to close the intermediate valve body 113. Preferably, the valve cover 130 can be connected to the valve body 110 by a first connecting member 133. The valve cover 130 can be configured in a substantially plate-like structure. The valve cover 130 includes a base and a protruding portion. The base is connected to the valve body 110 by the first connecting member 133. The protruding portion extends from the inner surface of the base in the direction of the valve body 110 in the second direction D2. The protruding portion can extend into the other portion 125 of the intermediate chamber to enhance the sealing performance. In this way, the valve cover 130 can close the intermediate valve body 113 to prevent leakage of the medium.

[0060] The support member 131 and the pressing plate 132 are both disposed outside the valve body 110, and the support member 131 can be connected to the valve body 110 by the valve cover 130. The support member 131 can also connect the pressing plate 132 and the valve cover 130. The support member 131 can be configured as a hollow distance tube with both ends open. The radial direction of the support member 131 is parallel to the first direction D1, and the axial direction of the support member 131 is parallel to the second direction D2. Optionally, the bottom end of the support member 131 can be connected to the valve cover 130 by welding. The top end of the support member 131 can be provided with the pressing plate 132, and the top of the support member 131 can be connected to the pressing plate 132 by welding. In this way, the axial length of the support member 131 can be pre-set to set the predetermined pressure value.

[0061] The support member 131 is provided with a deformable burst pin 151. The axial direction of the burst pin 151 is parallel to the second direction D2, and the radial direction of the burst pin 151 is parallel to the first direction D1. Preferably, the burst pin 151 can coincide with the central axis of the support member 131, and the support member 131 can provide sufficient space for the deformation of the burst pin. The first end 152 of the burst pin 151 along the second direction D2 can abut against the pressure plate 132. The pressure plate 132 is provided with a second connector 134, which can be a locking nut, and the first end 152 of the burst pin 151 abuts against the locking nut. The second end 153 of the burst pin 151 along the second direction D2 abuts against the valve stem 154.

[0062] The valve stem 154 can be arranged in the other part 125 of the intermediate chamber. The valve stem 154 can be configured as a substantially circular rod structure. The valve cover 130 is provided with a through hole 135, and the valve stem 154 extends through the through hole 135 along the second direction D2. The radial direction of the valve stem 154 is parallel to the first direction D1, and the axial direction of the valve stem 154 is parallel to the second direction D2. A part of the valve stem 154 is located in the support member 131, another part of the valve stem 154 is located in the through hole 135, and still another part of the valve stem 154 is located in the valve body 110.

[0063] The valve stem 154 can move relative to the valve cover 130. In the present embodiment, the movement direction of the valve stem 154 is perpendicular to the first direction D1, and the movement direction of the valve stem 154 is parallel to the second direction D2, and the axial direction (length direction) of the valve stem 154 is parallel to the second direction D2. The movement of the valve stem will be described later.

[0064] Further, the valve plate 139 is arranged inside the valve body 110. The valve plate 139 can be hinged to the valve body 110 and can rotate between a first position and a second position. Specifically, as shown in Figure 2 The inside of the valve body 110 is further provided with a hinge plate 164. Optionally, the inner surface of the other part 125 of the intermediate chamber is provided with the hinge plate 164. The valve plate 139 is provided with a rotating arm 165, and the rotating arm 165 can be hinged to the hinge plate 164 through a pin shaft 166, so as to facilitate the rotation of the valve plate 139 without damaging the structural strength of the valve body 110.

[0065] Now returning to Figure 1, the valve plate 139 is in the first position. The valve plate 139 in the first position can be substantially perpendicular to the first direction D1 to seal the inlet end 111 so that the inlet end 111 and the outlet end 112 are not in communication. The valve stem 154 can abut the valve plate 139 in the first position to apply a force to the valve plate 139 in the first position. Specifically, a first end 155 of the valve stem 154 along the second direction D2 abuts the valve plate 139 in the first position, and a second end 156 of the valve stem 154 along the second direction D2 extends through the through hole 135 and abuts the second end 153 of the burst pin 151.

[0066] The surface of the second connecting piece 134 facing the burst pin 151 is provided with a hole, and the first end 152 of the burst pin 151 can extend into the hole of the second connecting piece 134. The top of the second end 156 of the valve stem 154 can be provided with a hole, and the second end 153 of the burst pin 151 can extend into the hole of the second end 156 of the valve stem 154. In this way, both end faces of the burst pin 151 are under force.

[0067] As shown in Figure 1 and Figure 3 , when the pressure of the medium is not greater than the predetermined pressure value, the burst pin 151 does not deform, the burst pin 151 remains in a stable state, and the valve stem 154 and the valve plate 139 remain stationary. The medium exerts a force on the valve plate 139 in the first direction D1, and the force is transmitted to the burst pin 151 through the valve stem 154. The load transmitted by the medium to the burst pin 151 through the valve stem 154 is less than the critical load at which the burst pin 151 loses stability, and the burst pin 151 maintains a stable straight state, and the valve stem 154 does not move, so that the valve plate 139 does not move, the valve plate 139 tightly seals the inlet end 111, and the burst pin valve 100 is in a closed stable state.

[0068] As shown in Figure 2 and Figure 4 , as the pressure of the medium continues to rise, when the system set pressure value is reached, the load transmitted to the burst pin 151 through the valve stem 154 reaches the critical load at which the burst pin 151 loses stability, i.e. reaches the yield point of the burst pin 151. Within a millisecond, the burst pin 151 is bent and deformed, the length of the burst pin 151 along the second direction D2 is greatly reduced, and the burst pin 151 no longer exerts a force on the valve stem 154 in the direction towards the valve plate 139. The deformation of the burst pin 151 causes the valve stem 154 to lose constraint and be able to move in the direction of the second direction D2 towards the pressure plate 132. The rapid movement of the valve stem 154 in the second direction D2 can cause the valve plate 139 to rotate towards the second position, so that the inlet end 111 and the outlet end 112 are in communication, and the rapid discharge of high-pressure medium is realized. In Figure 2The unstable burst pin 151 is shown as not being separated from the valve stem 154, of course, in unillustrated embodiments, the unstable burst pin 151 can be separated from the valve stem 154.

[0069] The burst pin 151 can be supported by an elongated rod of a specific material, such as a large flexibility rod. The burst pin 151 complies with the Euler formula for buckling of a column: axial force on the pin ∽ pin diameter to the fourth power x pin material modulus of elasticity / pin length squared. The burst pin 151 is deformed to cause the valve plate 139 to rotate open.

[0070] From the Euler law for buckling of a column, for an elongated rod that is subjected to only axial load, when the axial force is less than the critical load of the rod, the elongated rod will remain in a straight equilibrium state and have stability against lateral disturbance. When the axial force reaches the critical load, the column will change from a straight stable state to an unstable state in a very short time and bend. This process of the column losing its stable equilibrium of straight shape and changing to unstable equilibrium of curved shape is buckling. After buckling occurs, the rod loses its load carrying capacity and a small increase in pressure will cause a significant increase in bending deformation. This property of stability and buckling of the elongated rod is very suitable for use in triggering of a pressure relief device.

[0071] Through the stable and unstable states of the burst pin 151, the straight structure of the burst pin 151 is changed to control the movement of the valve plate 139 and in turn to control the sealing and pressure relief of the burst pin valve 100. The burst pin 151 is not affected by the cyclic change of the pressure in the system, nor by the temperature and corrosiveness of the medium, and has high relief accuracy, such as within ±5%, to achieve the purpose of safely relieving the system pressure.

[0072] According to the burst pin valve 100 of the present application, the burst pin valve 100 comprises a valve body 110, a valve cover 130, a support member 131, a pressure plate 132, a valve plate 139, a burst pin 151 and a valve stem 154, the valve plate 139 is arranged inside the valve body 110 and is hinged to the valve body 110, the valve plate 139 is rotatable between a first position and a second position, the burst pin 151 is arranged in the support member 131, one end of the burst pin 151 abuts against the pressure plate 132, one end of the valve stem 154 abuts against the valve plate 139 in the first position, the other end of the burst pin 151 abuts against the other end of the valve stem 154, the valve plate 139 in the first position seals the inlet end 111 so that the inlet end 111 and the outlet end 112 are not communicated, and the valve plate 139 in the second position is separated from the inlet end 111 so that the inlet end 111 and the outlet end 112 are communicated. In this way, the burst pin valve 100 provided by the present application can relieve pressure and can act without relying on any external energy source, has high relief accuracy and reduces the pressure of the medium.

[0073] Further, when the pressure of the medium is greater than the predetermined pressure value, the burst pin 151 is kept in the bent state. The medium flows into the portion 124 of the middle chamber via the inlet end 111 and flows to the outlet end 112 through the portion 124 of the middle chamber. The medium can continuously push the valve plate 139 to move to the second position in the direction away from the inlet end 111. The first end 155 of the valve stem 154 is spaced apart from the valve plate 139. The through hole 135 of the valve cover 130 can guide the moving direction of the valve stem 154 to prevent the valve stem 154 from deviating.

[0074] To prevent the medium from leaking, a first seal 161 is arranged in the through hole 135, which can be configured as a sealing ring. The first seal 161 can be arranged around the valve stem 154 to prevent the medium from leaking from the through hole 135. Of course, a second seal 162 is also arranged between the valve body 110 and the valve cover 130 to seal the gap between the valve body 110 and the valve cover 130, thereby preventing the medium from leaking. Figure 1

[0075] When the burst pin 151 is deformed, the burst pin 151 is located in the support member 131, and the pressure relief process does not produce debris. The support member 131 is also provided with an observation window, through which the operator can observe the state of the burst pin 151 and directly detect whether the system is pressure relieved, which is easy to judge. The support member 131 can be made of transparent material, thereby facilitating observation. Preferably, the support member 131 is also provided with a position transmitter, which can be electrically connected with the control device to transmit the position signal of the valve stem 154 to the control device, so that the operator can remotely obtain the opening and closing information of the valve plate 139.

[0076] Further, the burst pin valve 100 can also prevent the medium from flowing backward. Specifically, as shown in Figure 2 The projection of the valve plate 139 in the second position along at least part of the first direction D1 coincides with the inlet end 111 and the outlet end 112. When the medium flows backward from the outlet end 112 to the inlet end 111, the medium acts on the valve plate 139, which can make the valve plate 139 in the second position move to the first position in the direction of the inlet end 111. The valve plate 139 in the first position seals the inlet end 111, thereby blocking the medium from flowing backward to the inlet end 111, thereby preventing the backward flowing medium from affecting the system. The first direction D1 is perpendicular to the moving direction of the valve stem 154, so that the flow of the medium does not interfere with the valve stem 154.

[0077] Now return to Figure 1 ​In order to improve the sealing between the valve plate 139 in the first position and the valve body 110, the valve body 110 is further provided with a recess 116 and a valve seat 117, the recess 116 is arranged on the inner diameter surface 118 of the inlet end 111. The valve seat 117 is arranged in the recess 116, and the inner diameter surface of the valve seat 117 does not protrude from the inner diameter surface 118 of the inlet end 111, so as to avoid affecting the flow of the medium. The valve plate 139 in the first position is tightly attached to the valve seat 117. In this way, the leakage of the medium from the position where the valve plate 139 contacts the valve body 110 can be prevented, so as to avoid affecting the pressure of the medium.

[0078] In order to improve the sealing, as shown in the drawings, Figure 2 The inner diameter surface of the valve seat 117 can include a first cylindrical sealing surface 120 and a tapered sealing surface 121, the first cylindrical sealing surface 120 is connected with the tapered sealing surface 121 along the circumferential direction of the valve seat 117. The axial direction of the valve seat 117 is parallel to the first direction D1, and the radial direction of the valve seat 117 is parallel to the second direction D2. The first cylindrical sealing surface 120 and the tapered sealing surface 121 are both tightly attached to the valve plate 139 in the first position, so that the cylindrical sealing surface and the tapered sealing surface 121 can jointly seal the valve plate 139 and the valve seat 117, and have more reliable sealing performance and lower opening resistance. The first cylindrical sealing surface 120 and the tapered sealing surface 121 do not protrude from the inner diameter surface 118 of the inlet end 111 along the second direction D2, so as to prevent affecting the flow of the medium.

[0079] Further, the inner diameter surface of the valve seat 117 further includes a second cylindrical sealing surface 122, the second cylindrical sealing surface 122 is connected with the tapered sealing surface 121 along the axial direction of the valve seat 117. Of course, the second cylindrical sealing surface 122 can also be connected with the first cylindrical sealing surface 120 along the circumferential direction of the valve seat 117. The second cylindrical sealing surface 122 can be flush with the first cylindrical sealing surface 120 along the circumferential direction of the valve seat 117, and the first cylindrical sealing surface 120 and the second cylindrical sealing surface 122 are flush with the inner diameter surface 118 of the inlet end 111, so as to avoid affecting the pressure of the medium. The tapered sealing surface 121 is closer to the valve plate 139 than the second cylindrical sealing surface 122 along the first direction D1. The tapered sealing surface 121 is inclined upward along the axial direction of the valve seat 117 towards the valve plate 139. In this way, the sealing performance is more reliable, and the opening resistance is lower.

[0080] To enable the valve plate 139 to be well tightly attached to the valve seat 117, the valve plate 139 is provided with a sealing plate 140. Specifically, the valve plate 139 comprises opposite first and second valve plate side surfaces 143 and 144, the first valve plate side surface 143 in the first position faces the inlet end 111, and the second valve plate side surface 144 in the first position faces the outlet end 112. The first valve plate side surface 143 is provided with the sealing plate 140. The length of the first valve plate side surface 143 is greater than the length of the sealing plate 140. The valve plate 139 and the sealing plate 140 can be integrally formed. The first valve plate side surface 143 and the sealing plate 140 can jointly form a stepped structure to enhance the sealing performance.

[0081] The sealing plate 140 comprises first and second sealing surfaces 141 and 142, the first sealing surface 141 is matched in shape with the first cylindrical sealing surface 120, and the first sealing surface 141 in the first position can be tightly attached to the first cylindrical sealing surface 120. The second sealing surface 142 is matched in shape with the conical sealing surface 121, and the second sealing surface 142 in the first position can be tightly attached to the conical sealing surface 121. In this way, leakage of the medium from the contact position between the sealing plate 140 and the valve seat 117 is prevented.

[0082] Optionally, as shown in Figure 1 The sealing plate 140 and the valve seat 117 are further provided with a third sealing member 163, which can be arranged between the first cylindrical sealing surface 120 and the first sealing surface 141, or between the conical sealing surface 121 and the second sealing surface 142, thereby enhancing the sealing performance.

[0083] Further, the valve seat 117 further comprises a valve seat side surface 123 connected to the first cylindrical sealing surface 120 and the conical sealing surface 121, the valve seat side surface 123 faces the outlet end 112 in the first direction D1. The first valve plate side surface 143 in the first position can be tightly attached to the valve seat side surface 123, thereby further sealing the gap between the valve plate 139 and the valve seat 117, and improving the sealing performance.

[0084] The valve plate 139 is further provided with a connecting plate 145, preferably, the connecting plate 145 is arranged on the second valve plate side surface 144. As shown in Figure 1As shown, the connecting plate 145 in the first position extends in the first direction D1 toward the outlet end 112, and the connecting plate 145 in the first position abuts against the valve stem 154. Preferably, the connecting plate 145 in the first position abuts against the first end 155 of the valve stem 154. The surface of the connecting plate 145 in the first position that abuts against the valve stem 154 can be substantially parallel to the first direction D1 to stably contact the valve stem 154. The blast pin 151 in the stable state can apply a force to the connecting plate 145 in the second direction D2 away from the pressure plate 132, and thus to the valve plate 139, to enhance the sealing between the valve plate 139 and the valve seat 117.

[0085] As described above, the load transmitted to the blast pin 151 by the valve stem 154 is less than the critical load at which the blast pin 151 loses stability, the blast pin 151 maintains a stable straight state, the valve stem 154 does not move, the valve plate 139 does not act, the valve plate 139 and the valve seat 117 are tightly sealed, and the blast pin valve 100 is in a closed stable state.

[0086] As the pressure of the medium continues to rise, when the system set pressure value is reached, the load transmitted to the blast pin 151 by the valve stem 154 reaches the critical load at which the blast pin 151 loses stability, i.e. reaches the yield point of the blast pin 151. Within milliseconds, the blast pin 151 is bent and deformed, the length of the blast pin 151 in the second direction D2 is greatly reduced, and the blast pin 151 no longer exerts a force on the valve stem 154 in the direction of the valve plate 139. The bottom of the blast pin 151 can move the valve stem 154 in the second direction D2 away from the pressure plate 132. The valve stem 154 loses its constraint and moves rapidly to rotate the valve plate 139. When the valve plate 139 separates from the valve seat 117, the inlet end 111 is in communication with the outlet end 112, and the high-pressure medium is rapidly released.

[0087] The contact point of the blast pin 151 of the blast pin valve 100 of the present application in contact with the valve plate 139 is different from the conventional arrangement. When the pressure of the medium is greater than the predetermined pressure value, the length of the force arm of the valve plate 139 when rotating is adjusted to achieve the purpose of adjusting the opening pressure of the valve plate 139. When the pressure of the medium is greater than the predetermined pressure value, the medium pushes the valve plate 139 and the connecting plate 145 to move away from the inlet end 111, and the connecting plate 145 is provided with a chamfer to avoid interference with the movement of the valve stem 154 when the connecting plate 145 moves.

[0088] When the bursting pin 151 needs to be replaced, the operator can first remove the bent bursting pin 151, and then push the valve plate 139 to rotate so that the valve plate 139 tightly abuts against the valve seat 117. The operator manually or with the aid of a tool pushes the valve stem 154 so that the first end 155 of the valve stem 154 abuts against the connecting plate 145. The operator then installs the new bursting pin 151, and tightens the second connecting piece 134, so that the bursting pin valve 100 returns to the initial sealing state. Thus, the resetting is simple, the shutdown cost is low.

[0089] According to the bursting pin valve 100 of the present application, the valve plate 139 can be opened or closed in a screwing manner, the structure is compact, the weight is small, the occupied space is small, the resetting is simple, the shutdown cost is low, the operation and installation are convenient, the long-term use cost is low, and the problems such as the pollution of the medium and the interference with the equipment work caused by the fragments during the pressure relief process are avoided.

[0090] Unless otherwise defined, technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of this application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items. As used herein, the term "about" when used in connection with a numerical value, means that the value is within 10% of the recited value.

[0091] The present application has been described by the above embodiments, but it should be understood that the above embodiments are only for the purpose of example and illustration, and are not intended to limit the present application to the described embodiments. In addition, those skilled in the art can understand that the present application is not limited to the above embodiments, and more various modifications and changes can be made according to the teachings of the present application, and these modifications and changes all fall within the scope of the present application. The scope of protection of the present application is defined by the attached claims and their equivalent scope.

Claims

1. A blasting needle valve, characterized in that, The burst needle valve comprises: a valve body comprising an inlet end and an outlet end coaxially arranged along a first direction; a valve cover connected with the valve body and provided with a through hole, a support member and a pressing plate, the support member and the pressing plate are arranged outside the valve body, and the support member connects the pressing plate and the valve cover; a valve plate arranged inside the valve body, the valve plate is hinged with the valve body, and the valve plate is rotatable between a first position and a second position, the valve plate in the first position seals the inlet end so that the inlet end and the outlet end are not communicated, and the valve plate in the second position is separated from the inlet end so that the inlet end and the outlet end are communicated; a burst needle arranged in the support member, the radial direction of the burst needle is parallel to the first direction, and one end of the burst needle abuts against the pressing plate; a valve rod, one end of the valve rod abuts against the valve plate in the first position, and the other end of the valve rod extends through the through hole and abuts against the other end of the burst needle, wherein the projection of the valve plate in the second position along at least part of the first direction coincides with the inlet end and the outlet end, and the first direction is perpendicular to the moving direction of the valve rod, wherein the valve plate is provided with a connecting plate, the connecting plate in the first position extends along the first direction towards the outlet end, and the connecting plate in the first position abuts against the valve rod.

2. The blasting needle valve according to claim 1, characterized in that The inside of the valve body is further provided with a hinge plate, the valve plate is provided with a rotating arm, and the rotating arm is hinged with the hinge plate.

3. The blasting needle valve of claim 1, wherein, The valve body is further provided with a groove and a valve seat, the valve seat is arranged in the groove, the inner diameter surface of the valve seat does not protrude from the inner diameter surface of the inlet end, and the valve plate in the first position is tightly fitted with the valve seat.

4. The blasting needle valve of claim 3, wherein, The inner diameter surface of the valve seat comprises a first cylindrical sealing surface and a conical sealing surface, the first cylindrical sealing surface is connected with the conical sealing surface along the circumferential direction of the valve seat, and the first cylindrical sealing surface and the conical sealing surface are tightly fitted with the valve plate in the first position.

5. The blasting needle valve of claim 4, wherein, The inner diameter surface of the valve seat further comprises a second cylindrical sealing surface, the second cylindrical sealing surface is connected with the conical sealing surface along the axial direction of the valve seat, the conical sealing surface is upwardly inclined along the axial direction towards the valve plate, and the first cylindrical sealing surface and the second cylindrical sealing surface are flush with the inner diameter surface of the inlet end.

6. The blasting needle valve of claim 4, wherein, The valve plate is provided with a sealing plate, the sealing plate comprises a first sealing surface and a second sealing surface, the shape of the first sealing surface matches the shape of the first cylindrical sealing surface, the shape of the second sealing surface matches the shape of the conical sealing surface, the first sealing surface in the first position is tightly fitted with the first cylindrical sealing surface, and the second sealing surface in the first position is tightly fitted with the conical sealing surface.

7. The blasting needle valve of claim 6, wherein, The valve seat further comprises a valve seat side surface connected with the first cylindrical sealing surface and the conical sealing surface, and the valve plate further comprises a valve plate side surface provided with the sealing plate and having a length greater than that of the sealing plate, the valve plate side surface in the first position being tightly combined with the valve seat side surface.

8. The blasting needle valve of claim 1, wherein, The valve body further comprises an intermediate chamber for connecting the inlet end and the outlet end, a part of the intermediate chamber, the inlet end and the outlet end being coaxially arranged along a first direction perpendicular to the moving direction of the valve rod, and the other part of the intermediate chamber being provided with the valve rod.

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