Pressure control valve with toughness

Abstract

The invention discloses a pressure control valve with toughness, relates to the technical field of valves, and aims to solve the problem that an existing pressure control valve cannot automatically repair the regulation and control function when a valve rod is broken. According to the pressure control valve, the valve rod toughness structure mainly composed of the linkage assembly, the clamping ring sleeve and the clamping jaw assembly is arranged, when the valve rod is broken, the valve element assembly falls down due to the fact that the direct traction effect of the valve rod is lost and drives the clamping ring sleeve and the buckle to move downwards, the clamping ring sleeve temporarily pulls the valve element assembly when the clamping ring sleeve moves downwards to eliminate the toughness gap, and therefore the valve element assembly is prevented from being damaged. At the moment, the buckles are opposite to the clamping holes in the corresponding clamping jaws; meanwhile, due to the fact that the clamping ring sleeve moves downwards, the clamping jaws are separated from the limitation of the clamping ring part and are driven by the clamping jaw springs to be folded in the radial direction, the clamping holes can move towards the buckles and are matched with the buckles to form buckle connection, the valve rod toughness structure replaces the broken valve rod to transmit regulation and control acting force to the valve element assembly, and self-repairing of the valve regulation and control function is achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of valves, and in particular relates to a pressure control valve with toughness. Background Art

[0002] A pressure control valve, also known as a pressure control valve, is a valve used to control the pressure of a fluid in a pipeline. It is mainly based on the principle of fluid mechanics and controls the pressure of the fluid by adjusting the valve opening. The opening adjustment of the valve is usually achieved by the force balance principle, that is, when the pressure of the fluid medium acts on the valve core, the valve core will be displaced by the pressure. At this time, the elastic force of the spring will offset the pressure of the fluid medium, so that the valve core can be kept in a balanced position, thereby achieving stable control of the fluid pressure.

[0003] The current improvement schemes of the pressure control valve are mainly designed for the valve core and the valve body passage. For example, the Chinese invention patent application with the publication number CN113108070A discloses a multi-stage pressure reduction series liquid level control valve structure; a valve seat is provided in the vertical cavity of the valve body, and the valve seat is divided into a throttling valve core cylindrical cavity and a buffer cylindrical cavity from top to bottom, a valve core sleeve is provided in the throttling valve core cylindrical cavity, the valve core sleeve is connected to the valve seat, the valve core sleeve is installed with the valve core, and a multi-stage series pressure reduction structure is provided between the valve core and the valve core sleeve; a valve cover is provided on the valve body, and the valve cover presses the valve core sleeve axially against the valve seat; the fluid medium flows from the inlet of the valve body to the buffer cylindrical cavity, flows to the throttling valve core cylindrical cavity after passing through the central through hole of the valve seat, flows out from the through hole on the upper side wall of the valve core sleeve to the reversing gap between the valve body and the valve core sleeve, and converges to the outlet of the valve body to flow out. The multi-stage step-down cascade liquid level regulating valve structure optimizes the valve structure according to the service environment and structural characteristics of the high-pressure differential liquid level control valve, which is beneficial to extending the service life and safe and stable operation cycle of the high-pressure differential liquid control valve.

[0004] Although the above-mentioned multi-stage pressure-reducing series liquid level regulating valve structure has improved the service life and stability of the valve by specially designing the valve core, it has only been designed as a separate buffer. In the existing transportation of oil and natural gas, the treatment degree of oil and natural gas is often different, which will cause the fluid pressure in the pipeline to be unstable and fluctuate, affecting the opening and closing of the valve port. When the fluid pressure is too large, feedback self-regulation cannot be achieved. In addition, during the use of the pressure control valve, pressure overload may occur, causing the relatively fragile valve stem to be damaged and broken. When the valve stem breaks, the valve cannot take measures to repair the control function by itself, and manual intervention and maintenance are required, which consumes more time and manpower. In addition, the existing pressure control valve only considers the impact of the high pressure of the fluid on the working condition of the valve, and does not consider other influencing factors, such as the impact of impurities in the fluid. If there are solid debris impurities that have not been completely processed, the valve flow channel will be blocked at the least, and the valve core will be damaged at the worst. The damage caused by the above two situations can only be maintained manually, affecting the progress of the operation, which is time-consuming and labor-intensive. Summary of the invention

[0005] The present invention provides a pressure control valve with toughness, aiming to solve the problem that the existing pressure control valve cannot repair the control function by itself when a valve stem breaks.

[0006] The technical solution adopted by the present invention to solve the technical problem is: a tough pressure control valve, comprising a valve body with a top opening, a valve cover arranged at the top opening, a valve core assembly arranged in the valve body, and a valve stem passing through the valve cover and connected to the valve core assembly at the lower end; It also includes a valve stem toughness structure; the valve stem toughness structure includes a linkage assembly, a clamping ring sleeve and a claw assembly; The linkage assembly is sleeved on the valve stem section on the upper side of the valve cover and can be linked with the valve stem; The clamping ring sleeve is arranged outside the valve stem, and its lower end is connected to the valve core assembly, and its upper end is the clamping ring part inside the linkage assembly, and there is a toughness gap between the clamping ring part and the inner bottom surface of the linkage assembly; There are two claw assemblies symmetrically arranged on the valve stem, and the claw assemblies include claws, a sealing slider, a buckle and a claw spring; the claws are arranged through the valve cover and can move radially along the valve cover; the sealing slider is arranged on the claws and slidably cooperates with the valve cover to form a movable seal between the claws and the valve cover; a clamping hole is arranged at the lower end of the claw, and the buckle is arranged on the valve core assembly and corresponds to the claw part on the upper side of the clamping hole; the upper end of the claw penetrates into the linkage assembly, and the claw spring is arranged in the linkage assembly so that the upper end of the claw abuts against the clamping ring part, and the height of the abutting part is less than or equal to the width of the toughness gap; When the valve stem breaks, the valve core assembly falls and drives the clamping ring sleeve and the buckle to move downward, the claws are free from the restriction of the clamping ring part and are driven by the claw spring to radially retract, so that the clamping hole can move toward the buckle and cooperate with it.

[0007] Furthermore, a slide rail is provided on the valve cover, and the sealing slider is slidably matched with the valve cover through the slide rail.

[0008] Further, the linkage assembly includes a linkage guide plate and a linkage sleeve; The linkage guide plate is provided with a stepped hole and two radial slide grooves symmetrical to the stepped hole; the stepped hole includes a valve stem through hole and a clamp ring countersunk hole; the radial slide groove is connected with the upper part of the clamp ring countersunk hole, and the bottom of the radial slide groove is provided with a first claw through hole; the linkage guide plate is sleeved outside the valve stem through the valve stem through hole and is located on the upper side of the valve cover; the valve cover is provided with a second claw through hole corresponding to the first claw through hole; The linkage shaft sleeve is sleeved outside the valve stem and can be linked with the valve stem, and the lower part thereof is a guide plate cover sleeved outside the linkage guide plate; The snap ring portion is arranged in the snap ring counterbore and corresponds to the radial slide groove; A claw horizontal handle is provided at the upper end of the claw, and the claw horizontal handle is slidably matched with the radial slide groove. The lower end of the claw passes through the first claw through hole and the second claw through hole in sequence and extends into the valve body; the claw spring is arranged between the outer end of the claw horizontal handle and the guide disc cover and is in a compressed state. Under the action of its elastic force, the inner end of the claw horizontal handle abuts against the clamping ring part.

[0009] Furthermore, the clamping hole is a tapered hole, and the end with a larger hole opening is close to the buckle; The outer end of the buckle is a conical elastic block adapted to the clamping hole, and the conical elastic block can self-lock the buckle after it is matched with the clamping hole.

[0010] Furthermore, a vertical valve cavity and a valve seat are provided in the valve body, and the valve seat divides the vertical valve cavity into an upper flow control cavity and a lower buffer cavity; The side of the valve body is provided with an inlet connected to the buffer chamber, and an outlet connected to the flow control chamber; The top opening of the valve body is formed by the vertical valve cavity penetrating upward to the top surface of the valve body; The valve core assembly is arranged in the vertical valve cavity and is in sealing contact with the valve seat; The valve stem is arranged vertically, and can drive the valve core assembly to move axially along the vertical valve cavity, so that the inlet and the outlet can be switched between a connected state and a cut-off state.

[0011] Furthermore, the buffer cavity is divided into a blind cavity section, a front cavity section, a matching section and a transition section from bottom to top, and the cross-sectional dimension of the matching section is smaller than the cross-sectional dimension of the front cavity section and smaller than the cross-sectional dimension of the transition section; The valve core assembly includes an upper valve core, a lower valve core, an inner valve core and a pressure spring; the upper valve core is arranged in the flow control cavity and cooperates with the valve seat; the lower valve core includes a lower valve core body arranged in the transition section and connected to the lower end of the upper valve core, and a lower valve core support connected to the lower end of the lower valve core body and slidingly cooperated with the blind cavity section and the matching section; a first valve core annular gap cavity is formed between the lower valve core body and the wall surface of the transition section, an inverted tower-shaped inner cavity formed by coaxially connecting at least three inverted cone-shaped cavities is provided inside the lower valve core body, and a connection is provided on the upper part of the lower valve core body to connect the inverted tower-shaped inner cavity with the first valve core The valve core has a first valve core outflow hole connected to the core annular gap cavity; a second valve core annular gap cavity is formed between the lower valve core support and the wall surface of the front cavity section, the lower valve core support has an inner cavity and is provided with a valve core inlet hole connected to the second valve core annular gap cavity and a second valve core outflow hole corresponding to the matching section; the inner valve core is axially movably arranged in the inverted tower-shaped inner cavity, and the inner valve core has an inverted cone structure corresponding to each inverted cone-shaped cavity of the inverted tower-shaped inner cavity; a pressure spring is arranged between the inner valve core and the upper valve core and is in a compressed state, so that the inverted cone structures corresponding to each other are in sealing contact with the bottom inclined surface of the inverted cone-shaped cavity; The inlet is communicated with the second valve core annular gap cavity; The buckle is arranged on the side of the upper valve core; Among them, the inner valve core can respond to the balance between the fluid pressure and the elastic force of the pressure spring to perform lifting and lowering movements, forming the following multi-stage adjustment states: Initial state: the inner valve core seals the inverted tower-shaped inner cavity, the outflow hole of the second valve core is closed, and the inflow hole of the valve core is connected with the annular gap cavity of the second valve core; First-stage regulation state: the fluid pressure causes the inner valve core to overcome the elastic force of the pressure spring and lift up, and a flow gap is left between the corresponding inverted cone structure and the bottom slope of the inverted cone-shaped cavity to form a multi-stage labyrinth cavity. After the fluid flows through the multi-stage labyrinth cavity and is decompressed, it flows into the first valve core annular gap cavity through the first valve core outlet hole; Second-stage regulation state: the fluid gradually increases the pressure in the transition section. When the preset pressure is reached, the fluid pushes the upper valve core to drive the valve core assembly to move upward as a whole, the inlet and the outlet are connected, and at the same time, the outlet hole of the second valve core moves upward, and the fluid flows out from the outlet hole of the first valve core and the outlet hole of the second valve core in a mixed manner; The third-level regulating state: when the fluid pressure continues to increase, the second valve core outlet hole is fully opened, the valve core assembly continues to rise, the valve core inlet hole moves upward and the opening gradually decreases, and the fluid passage is gently reduced; Overpressure protection state: When the fluid pressure is too high, the valve core assembly continues to be lifted, the valve core inlet hole moves up to the matching section and is completely closed, cutting off the fluid passage and entering the overpressure protection state.

[0012] Furthermore, the outflow holes of the first valve core are circular holes, of which there are at least three and are evenly distributed around the circumference of the lower half valve core body; The valve core inlet holes are rectangular holes opened along the axial direction of the lower valve core support, and there are at least three of them evenly distributed around the circumference of the lower valve core support; The second valve core outflow holes are rectangular holes, of which there are at least three and are evenly distributed around the circumference of the lower half valve core support.

[0013] Furthermore, a spring hole is provided at the bottom of the upper valve core, and a pressure spring is arranged in the spring hole.

[0014] Furthermore, the pressure control valve also includes a solid impurity separation device; the solid impurity separation device includes a filter tube, a valve tube, a propeller and a storage box; The filter tube is arranged vertically, and a filter screen structure is arranged on it; The valve pipe is sleeved outside the filter pipe and a separation cavity is formed between the valve pipe and the filter screen structure. The valve pipe is provided with an outflow pipe connecting the separation cavity with the inner cavity of the valve body. The bottom of the valve pipe is provided with a sand discharge port correspondingly connected with the inner cavity of the filter pipe. The propeller is rotatably arranged in the inner cavity of the filter tube and is kept coaxial with the filter tube; The storage box is arranged at the lower side of the valve pipe, and the box opening is connected with the sand discharge port.

[0015] Furthermore, the filter structure is mainly composed of a plurality of evenly distributed filter holes opened at the lower part of the filter tube; An oar rack is arranged on the upper part of the inner cavity of the filter tube, and a propeller is rotatably arranged on the oar rack.

[0016] The beneficial effects of the present invention are as follows: the pressure control valve is provided with a valve stem toughness structure mainly composed of a linkage assembly, a retaining ring sleeve and a claw assembly. When the valve stem is broken, the valve core assembly will fall downward due to the loss of the direct pulling effect of the valve stem and drive the retaining ring sleeve and the buckle to move downward. When the retaining ring sleeve moves down to eliminate the toughness gap, it will temporarily pull the valve core assembly. At this time, the buckle is exactly opposite to the clamping hole on the corresponding claw; at the same time, due to the downward movement of the retaining ring sleeve, the claw is separated from the restriction of the retaining ring part and radially contracted by the claw spring, and then the clamping hole can move toward the buckle and cooperate with it to form a buckle connection, so that the valve stem toughness structure can take over the broken valve stem to transmit the regulating force to the valve core assembly, thereby realizing the self-repair of the valve regulating function, so that the pressure control valve can continue to work without manual replacement of the valve stem, thereby ensuring the continuous and stable operation of the valve, and reducing the operation and maintenance costs and labor intensity.

[0017] The technical effects brought about or directly produced by other technical features of the present invention will be described in detail in the subsequent specific implementation methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention; Figure 2 is a partial cross-sectional view of the present invention; Figure 3 yes Figure 2 A partial enlarged view of the middle A; Figure 4 is along Figure 2 Sectional view along the midline BB; Figure 5 yes Figure 4 A partial enlarged view of point C in the middle; Figure 6 yes Figure 4 A partial enlarged view of point D in the middle; Figure 7 It is a schematic diagram of the three-dimensional structure of the valve cover in the present invention; Figure 8 It is a schematic diagram of the three-dimensional structure of the linkage guide plate in the present invention; Fig. 9 is a cross-sectional view of a solid impurity separation device in the present invention; Marked in the figure: 100-valve body, 101-flow control cavity, 102-buffer cavity, 1021-blind cavity section, 1022-front cavity section, 1023-matching section, 1024-transition section, 103-valve seat, 104-inlet, 105-outlet, 200-valve cover, 210-second claw through hole, 220-slide rail, 300-valve core assembly, 310-upper half valve core, 311-spring hole, 320-lower half valve core, 321-lower half valve core body, 3211-inverted tower-shaped inner cavity, 3212-first valve core outlet hole, 322-lower half valve core support, 3221-valve core inlet hole, 3222-second valve core outlet hole, 330-inner valve core, 340- Pressure spring, 400-valve stem, 500-valve stem toughness structure, 501-toughness gap, 510-linkage guide plate, 511-valve stem through hole, 512-snap ring countersunk hole, 513-radial slide groove, 514-first claw through hole, 520-linkage sleeve, 521-guide plate cover, 530-snap ring sleeve, 531-snap ring part, 541-claw, 5411-clamping hole, 542-sealing slider, 543-buckle, 544-claw spring, 600-solid impurity separation device, 610-filter tube, 611-filter screen structure, 612-paddle rack, 620-valve tube, 621-separation chamber, 622-outflow pipe, 623-sand discharge port, 630-propeller. DETAILED DESCRIPTION

[0019] The present invention will be further described below in conjunction with the accompanying drawings and embodiments. The same reference numerals in the accompanying drawings represent components with the same or similar functions. Although various aspects of the embodiments are shown in the accompanying drawings, the drawings are not necessarily drawn to scale unless otherwise specified.

[0020] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "head", "tail", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate directions or positions, and dimensional relationships based on the directions or position relationships shown in the accompanying drawings, and are only for the convenience of description, and do not indicate or imply that the referred device or component must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as limiting the present invention.

[0021] In the description of the present invention, the term "toughness" refers to: the ability of a device or component to restore its original function and purpose after failure or damage; for example: after the valve stem 400 breaks, the valve stem toughness structure 500 replaces the broken valve stem 400 to transmit the control force to the valve core assembly 300, thereby realizing the self-repair of the valve control function. When the term "multiple" represents a quantity, it usually refers to a quantity of three or more, for example: "multiple" usually refers to three or more. The expression "mainly composed of..." is interpreted as also containing structural components not mentioned in the sentence. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance.

[0022] Combination Figure 1 , Figure 2 , Figure 4 , Figure 5 , Figure 6 , Figure 7 and Figure 8 As shown, a tough pressure control valve comprises a valve body 100 with a top opening, a valve cover 200 arranged at the top opening, a valve core assembly 300 arranged in the valve body 100, and a valve stem 400 which passes through the valve cover 200 and is connected to the valve core assembly 300 at the lower end; The pressure control valve further includes a valve stem toughness structure 500; the valve stem toughness structure 500 includes a linkage assembly, a clamping ring sleeve 530 and a claw assembly; The linkage assembly is sleeved on the stem section of the valve stem 400 on the upper side of the valve cover 200 and can be linked with the valve stem 400; the linkage assembly can be directly connected to the valve stem 400 to achieve linkage, or can be linked to the valve stem 400 by connecting the same actuator to achieve linkage, or can be indirectly connected to the valve stem 400 through a transmission mechanism to achieve linkage; The clamping ring sleeve 530 is sleeved outside the valve stem 400, and its lower end is connected to the valve core assembly 300. Its upper end is a clamping ring portion 531 located inside the linkage assembly. There is a toughness gap 501 between the clamping ring portion 531 and the inner bottom surface of the linkage assembly. The toughness gap 501 is a redundant space for the clamping ring sleeve 530 to move downward relative to the linkage assembly, and is mainly used to ensure that the clamping ring portion 531 can give up the position of the blocking claw 541 after the valve stem 400 breaks, so as to trigger the valve stem toughness structure 500, and limit the downward movement distance of the clamping ring sleeve 530 and the valve core assembly 300 connected thereto, so as to ensure that the buckle 543 can be accurately aligned with the clamping hole 5411. There are two claw assemblies symmetrically arranged on the valve stem 400, and the claw assemblies include a claw 541, a sealing slider 542, a buckle 543 and a claw spring 544; the claw 541 is arranged through the valve cover 200 and can move in the radial direction of the valve cover 200, that is, the opening on the valve cover 200 for the claw 541 to pass through has a radial dimension of the valve cover 200 that is larger than the radial dimension of the claw 541 along the valve cover 200; the sealing slider 542 is arranged on the claw 541 and slidably cooperates with the valve cover 200 to form a movable seal between the claw 541 and the valve cover 200; the lower end of the claw 541 is provided with a clamping hole 5411, and the buckle 543 is provided with a clamping hole 5411. The claw portion 541 is arranged on the valve core assembly 300 and corresponds to the claw portion on the upper side of the clamping hole 5411. The distance between the claw portion and the clamping hole 5411 is generally the width of the toughness gap 501. The upper end of the claw 541 penetrates into the linkage assembly. The claw spring 544 is arranged in the linkage assembly and makes the upper end of the claw 541 abut against the clamping ring portion 531. The height of the abutting portion is less than or equal to the width of the toughness gap 501. In this way, it can be ensured that the clamping ring portion 531 can give up the position of blocking the claw 541 after the clamping ring sleeve 530 moves downward. The claw spring 544 is usually arranged between the upper end of the claw 541 and the inner wall of the linkage assembly. When the pressure control valve is in normal operation, the linkage assembly is linked with the valve stem 400, and the relative positions of the two remain unchanged; the claw assembly is relatively still with the valve core assembly 300 in the vertical direction, and the lower part of the claw 541 is located outside the valve core assembly 300 and does not interfere with its normal opening and closing. Due to the elastic force of the claw spring 544, the claw 541 tends to shrink inward in the radial direction of the valve, but is blocked by the clamping ring 531; the clamping ring sleeve 530 is clamped by the two claws 541 and is not affected by the stress inside the valve stem 400; When the valve stem 400 breaks, the valve core assembly 300 will fall downward due to the loss of the direct pulling effect of the valve stem 400 and drive the retaining ring sleeve 530 and the buckle 543 to move downward. When the retaining ring sleeve 530 moves down to eliminate the toughness gap 501, it will temporarily pull the valve core assembly 300. At this time, the buckle 543 is opposite to the retaining hole 5411 on the corresponding claw 541; at the same time, due to the downward movement of the retaining ring sleeve 530, the claw 541 is separated from the restriction of the retaining ring part 531 and is driven radially to shrink by the claw spring 544, and then the retaining hole 5411 can move toward the buckle 543 and cooperate with it to form a buckle connection, so that the valve stem toughness structure 500 can replace the broken valve stem 400 to transmit the regulating force to the valve core assembly 300, thereby realizing the self-repair of the valve regulating function.

[0023] Because the valve stem 400 is easily impacted by fluid when the pressure control valve is in the overall open state, the fracture failure of the valve stem 400 mainly occurs in the overall open state, that is, when the valve core assembly 300 moves upward away from the valve seat 103. If the valve stem 400 breaks when the pressure control valve is in the closed state, the valve stem toughness structure 500 can still be triggered and play the above-mentioned redundant role when the actuator lifts the valve stem 400, thereby realizing the self-repair of the valve control function.

[0024] Combination Figure 1 , Figure 4 , Figure 5 and Figure 7 As shown, in some embodiments, a slide rail 220 is provided on the valve cover 200, and the sealing slider 542 is slidably matched with the valve cover 200 through the slide rail 220. The slide rail 220 can not only guide the sealing slider 542 and the claw 541 connected to the sealing slider 542, and improve the stability of the installation of the claw 541, but also reduce the friction between the sealing slider 542 and the valve cover 200, thereby improving the performance and service life of the movable seal.

[0025] Combination Figure 2 , Figure 4 , Figure 5 , Figure 7 and Figure 8As shown, in some embodiments, the linkage assembly includes a linkage guide plate 510 and a linkage sleeve 520; the linkage guide plate 510 can be in various shapes, preferably in a disc shape; the linkage guide plate 510 is provided with a stepped hole and two radial slide grooves 513 symmetrical to the stepped hole, and the radial slide grooves 513 are usually arranged along the radial direction of the valve; the stepped hole includes a valve stem through hole 511 and a snap ring countersunk hole 512 on the upper side of the valve stem through hole 511, and the bottom surface of the snap ring countersunk hole 512 is The inner bottom surface of the linkage assembly; the radial groove 513 is connected to the upper part of the clamp ring counterbore 512, and the bottom of the radial groove 513 is provided with a first claw through hole 514; the linkage guide plate 510 is sleeved on the outside of the valve stem 400 through the valve stem through hole 511 and is located on the upper side of the valve cover 200; the valve cover 200 is provided with a second claw through hole 210 corresponding to the first claw through hole 514; the linkage sleeve 520 is sleeved on the outside of the valve stem 400 and can be linked with the valve stem 400, and its lower part is The guide disc cover 521 is sleeved outside the linkage guide disc 510; the snap ring portion 531 is arranged in the snap ring counterbore 512 and corresponds to the radial slide groove 513; the main body of the linkage sleeve 520 is usually a sleeve structure, which is coaxially arranged with the valve stem 400, and the linkage is achieved by fixedly connecting the main body with the valve stem 400, and is connected to the linkage guide disc 510 through the lower guide disc cover 521, so that the linkage guide disc 510 also maintains a relatively static position with the valve stem 400 in the axial direction. Stop; a claw horizontal handle is provided at the upper end of the claw 541, that is: the claw 541 is an inverted "L" shaped structure, the claw horizontal handle is slidably matched with the radial slide groove 513, and the lower end of the claw 541 passes through the first claw through hole 514 and the second claw through hole 210 in sequence and extends into the valve body 100; the claw spring 544 is arranged between the outer end of the claw horizontal handle and the guide disk cover 521 and is in a compressed state, and under the action of its elastic force, the inner end of the claw horizontal handle abuts against the clamping ring portion 531.

[0026] Combination Figure 2 , Figure 4 and Figure 5 As shown, in some embodiments, the snap ring sleeve 530 is a cylindrical structure, and its inner diameter is slightly larger than the outer diameter of the valve stem 400; the snap ring sleeve 530 and the valve stem 400 are clearance-matched, and the clearance between the two is usually less than 0.05 mm; the snap ring portion 531 at the upper end of the snap ring sleeve 530 is a circular ring structure, and its outer diameter is larger than the outer diameter of other parts of the snap ring sleeve 530. The lower end of the snap ring sleeve 530 is generally connected to the valve core assembly 300 through a thread.

[0027] In order to facilitate the connection between the buckle 543 and the clamp hole 5411 and ensure the reliability of the connection, Figure 4 and Figure 6As shown, in some embodiments, the clamping hole 5411 is a conical hole, and the end with a larger hole opening is close to the buckle 543; the outer end of the buckle 543 is a conical elastic block adapted to the clamping hole 5411, and the conical elastic block can self-lock the buckle 543 after it is matched with the clamping hole 5411. The conical elastic block is usually made of elastic material, which has the ability of elastic deformation. It can be deformed during the process of embedding into the clamping hole 5411 to facilitate embedding and avoid rigid collision. After embedding into the clamping hole 5411, it can return to its original state to form a buckle connection with the clamping hole 5411 to achieve self-locking.

[0028] Combination Figure 2 , Figure 3 and Figure 4 As shown, in some embodiments, a vertical valve cavity and a valve seat 103 are provided in the valve body 100, and the valve seat 103 divides the vertical valve cavity into an upper flow control cavity 101 and a lower buffer cavity 102; a side of the valve body 100 is provided with an inlet 104 connected to the buffer cavity 102, and an outlet 105 connected to the flow control cavity 101; the top opening of the valve body 100 is formed by the vertical valve cavity penetrating upward to the top surface of the valve body 100; the valve core assembly 300 is arranged in the vertical valve cavity and is in sealing contact with the valve seat 103; the valve stem 400 is vertically arranged, which can drive the valve core assembly 300 to move axially along the vertical valve cavity, so that the inlet 104 and the outlet 105 can switch between a connected state and a cut-off state.

[0029] In conjunction with Fig. 1, Fig. 2 and Fig. 4, in some embodiments, the flow control chamber 101 has an ellipsoidal chamber, and the cross-sectional size of the ellipsoidal chamber is larger than the cross-sectional size of other parts of the flow control chamber 101. The ellipsoidal chamber can increase the area and spatial volume of the flow cross section to effectively reduce the velocity of the fluid, thereby reducing the impact of the fluid on the valve stem 400, and can also increase the strength of the valve body 100, and is also easy to process and manufacture.

[0030] Combination Figure 2 , Figure 3 , Figure 4 and Figure 6As shown, in some embodiments, the buffer cavity 102 is divided into a blind cavity section 1021, a front cavity section 1022, a matching section 1023 and a transition section 1024 from bottom to top, and the cross-sectional dimension of the matching section 1023 is smaller than the cross-sectional dimension of the front cavity section 1022 and smaller than the cross-sectional dimension of the transition section 1024; the valve core assembly 300 includes an upper valve core 310, a lower valve core 320, an inner valve core 330 and a pressure spring 340; the upper valve core 310 is arranged in the flow control cavity 101 The lower valve core 320 includes a lower valve core body 321 disposed in the transition section 1024 and connected to the lower end of the upper valve core 310, and a lower valve core support 322 connected to the lower end of the lower valve core body 321 and slidably matched with the blind cavity section 1021 and the matching section 1023; a first valve core annular gap cavity is formed between the lower valve core body 321 and the wall surface of the transition section 1024, and the interior of the lower valve core body 321 is provided with at least three inverted cone-shaped cavities. The inverted tower-shaped inner cavity 3211 is formed by the shaft connection, and the upper part of the lower valve core body 321 is provided with a first valve core outflow hole 3212 which connects the inverted tower-shaped inner cavity 3211 with the first valve core annular cavity; a second valve core annular cavity is formed between the lower valve core support 322 and the wall surface of the front cavity section 1022, and the lower valve core support 322 has an inner cavity and is provided with a valve core inlet hole 3221 connected with the second valve core annular cavity and a second valve core outflow hole 3222 corresponding to the matching section 1023; The valve core 330 is axially movable in the inverted pyramid-shaped inner cavity 3211, and the inner valve core 330 has an inverted cone structure corresponding to each inverted cone-shaped cavity of the inverted pyramid-shaped inner cavity 3211; the pressure spring 340 is arranged between the inner valve core 330 and the upper valve core 310 and is in a compressed state, so that the corresponding inverted cone structures are in sealing contact with the bottom inclined surface of the inverted cone-shaped cavity; the inlet 104 is connected to the second valve core annular gap cavity; the buckle 543 is arranged on the side of the upper valve core 310; The inner valve core 330 can move up and down in response to the balance between the fluid pressure and the elastic force of the pressure spring 340, forming the following multi-stage adjustment state: Initial state: the valve core assembly 300 is in sealing contact with the valve seat 103 through the upper valve core 310, the lower valve core support 322 is in sliding cooperation with the blind cavity section 1021 and the cooperation section 1023, the inner valve core 330 seals the inverted tower-shaped inner cavity 3211, the second valve core outflow hole 3222 is closed, and the valve core inflow hole 3221 is connected with the second valve core annular gap cavity; the fluid can flow into the valve core assembly 300 from the valve core inflow hole 3221, but under the elastic force of the pressure spring 340, the flow channel in the valve core assembly 300 is in a cut-off state; First-stage regulation state: the fluid pressure gradually increases, so that the inner valve core 330 overcomes the elastic force of the pressure spring 340 and rises, and a flow gap is left between the corresponding inverted cone structures and the bottom inclined surface of the inverted cone-shaped cavity to form a multi-stage labyrinth cavity. The fluid flows through the multi-stage labyrinth cavity, and the pressure is reduced and the speed is reduced under the blocking effect of each inverted cone structure, which effectively reduces the impact of the fluid; when the fluid pressure fluctuates, the multi-stage labyrinth cavity can also play a role in stabilizing the pressure; after the fluid is divided and depressurized, it flows into the first valve core annular gap cavity through the first valve core outlet hole 3212 for secondary storage, and the fluid is buffered again; Second-stage regulation state: as the fluid continues to flow in, the first valve core annular gap cavity is filled, and the fluid gradually increases the pressure of the transition section 1024. When the preset pressure is reached, the fluid pushes the upper valve core 310 away from the valve seat 103 and drives the valve core assembly 300 to move upward as a whole, the inlet 104 is connected with the outlet 105, and the pressure control valve is generally opened; at the same time, the second valve core outlet hole 3222 moves upward and communicates with the first valve core annular gap cavity, and the fluid flows out from the first valve core outlet hole 3212 and the second valve core outlet hole 3222; The third-stage regulating state: when the fluid pressure continues to increase, the second valve core outlet hole 3222 is fully opened, the valve core assembly 300 continues to rise, the valve core inlet hole 3221 moves upward and the opening gradually decreases, the total inlet cross section gradually decreases, and the fluid passage is gradually reduced without abrupt changes, ensuring that good pressure reduction, pressure stabilization and flow stabilization effects can be achieved under the high-pressure state of the fluid; Overpressure protection state: When the fluid pressure is too high, the valve core assembly 300 continues to be lifted, and the valve core inlet hole 3221 moves up to the matching section 1023 and is completely closed, thereby cutting off the fluid passage and entering the overpressure protection state.

[0031] The pressure control valve achieves multiple buffering of the fluid through structures such as a multi-stage labyrinth cavity and a transition section 1024, and by adjusting the opening of the valve core assembly 300 and the valve seat 103, the pressure control valve has a better feedback-regulated pressure and flow stabilization effect.

[0032] In order to increase the total outflow area and ensure the flow control accuracy, combined with Figure 2 , Figure 3 and Figure 4 As shown, in some embodiments, the first valve core outflow holes 3212 are circular holes, and there are at least three of them evenly distributed around the circumference of the lower valve core body 321. Preferably, the number of the first valve core outflow holes 3212 is four.

[0033] Preferably, combined Figure 2 , Figure 3 and Figure 4As shown, in some embodiments, the second valve core outflow holes 3222 are rectangular holes, which are at least three and evenly distributed around the circumference of the lower valve core support 322. Preferably, the number of the second valve core outflow holes 3222 is six.

[0034] In order to increase the total inlet area and ensure the flow control accuracy, combined with Figure 2 , Figure 3 and Figure 4 As shown, in some embodiments, the valve core inlet holes 3221 are rectangular holes opened along the axial direction of the lower valve core support 322, and there are at least three of them and they are evenly distributed around the circumference of the lower valve core support 322. Preferably, the number of the valve core inlet holes 3221 is six.

[0035] In order to facilitate the installation of the pressure spring 340 and to constrain it radially to prevent it from lateral deviation when subjected to force, Figure 2 , Figure 3 and Figure 4 As shown, in some embodiments, a spring hole 311 is provided at the bottom of the upper valve core 310 , and the pressure spring 340 is disposed in the spring hole 311 .

[0036] Combination Figure 1 , Figure 2 , Figure 3 , Figure 4 and Fig. 9 As shown, in some embodiments, the pressure control valve further includes a solid impurity separation device 600; the solid impurity separation device 600 includes a filter tube 610, a valve tube 620, a propeller 630 and a storage box; the filter tube 610 is vertically arranged, and a filter screen structure 611 is arranged on it; the valve tube 620 is sleeved outside the filter tube 610 and a separation chamber 621 is formed between the valve tube 620 and the filter screen structure 611, and an outflow pipe 622 is provided on the valve tube 620 to connect the separation chamber 621 with the inner cavity of the valve body 100, and a sand discharge port 623 corresponding to the inner cavity of the filter tube 610 is provided at the bottom of the valve tube 620; the propeller 630 is rotatably arranged in the inner cavity of the filter tube 610 and keeps coaxial with the filter tube 610; the storage box is arranged at the lower side of the valve tube 620, and its box port is connected to the sand discharge port 623. Usually, flange structures for connection are provided at the outer ends of the filter tube 610 and the valve tube 620 to facilitate connection with external pipelines, etc.

[0037] The solid impurity separation device 600 can separate the solid impurities in the fluid by a spiral centrifugal separation method before the fluid enters the valve body 100, so as to reduce the risk of clogging of the valve core assembly 300 and improve the safety and durability of the operation of the pressure control valve. Specifically, during normal use, the solid impurity separation device 600 is arranged vertically, and the fluid enters from the upper end of the filter tube 610 and impacts the blades of the propeller 630, driving the propeller 630 to rotate; the fluid forms a vortex under the rotation of the propeller 630, and the solid impurities are blocked by the filter structure 611 and cannot enter the separation chamber 621; the fluid enters the separation chamber 621 after being filtered by the filter structure 611, and enters the valve body 100 through the outlet pipe 622; the solid impurities that have not passed through the filter structure 611 fall along the inner wall of the filter tube 610 and are discharged into the storage box through the sand discharge port 623. Moreover, since the solid impurity separation device 600 adopts a spiral centrifugal separation method to remove impurities, during the process of separating solid impurities, the vortex fluid tangentially flushes the surface of the filter structure 611, which can cause impurities adsorbed on the filter structure 611 to fall off. Compared with traditional flat filters, the filter structure 611 is not easy to be blocked and has a longer service life.

[0038] In order to improve the filtering effect, Fig. 9 As shown, in some embodiments, the filter structure 611 is mainly composed of a plurality of evenly distributed filter holes opened at the lower part of the filter tube 610. The pore size of the filter hole is generally smaller than the minimum particle size of the solid impurities to be separated.

[0039] In order to facilitate the installation of propeller 630, Fig. 9 As shown, in some embodiments, a propeller 612 is provided at the upper portion of the inner cavity of the filter tube 610, and a propeller 630 is rotatably disposed on the propeller 612. Preferably, the propeller 630 is a four-blade propeller.

[0040] The description of various embodiments of the present invention is presented herein for illustrative purposes only and is not intended to be exhaustive or limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terms used herein are selected to best explain the principles, practical applications, or technological advances of the embodiments, or to enable other persons skilled in the art to understand the embodiments disclosed herein, compared to the technology found on the market.

[0041] It should be understood that certain features of the invention described in the context of separate embodiments for the sake of clarity may also be provided in combination in a single embodiment. Conversely, various features of the invention described in the context of a single embodiment for the sake of brevity may also be provided individually or in any suitable sub-combination, or in any other described embodiment of the invention where appropriate. Certain features described in the context of various embodiments are not considered essential features of those embodiments unless the embodiments would not function without those features.

[0042] All publications, patents, and patent applications mentioned herein are incorporated herein by reference in their entirety, to the same extent as if each individual publication, patent, or patent application was specifically and individually indicated as being incorporated herein by reference. In addition, the citation or identification of any reference herein should not be construed as an admission that such reference is available as prior art to the present invention. To the extent that section headings are used, the section headings should not be construed as necessarily limiting.

Claims

1. A tough pressure control valve, comprising a valve body (100) having a top opening, a valve cover (200) arranged at the top opening, a valve core assembly (300) arranged in the valve body (100), and a valve stem (400) passing through the valve cover (200) and connected to the valve core assembly (300) at its lower end; Features: Also included is a valve stem toughness structure (500); the valve stem toughness structure (500) includes a linkage assembly, a clamping ring sleeve (530) and a claw assembly; The linkage assembly is sleeved on a stem section of the valve stem (400) on the upper side of the valve cover (200) and is capable of linkage with the valve stem (400); The clamping ring sleeve (530) is sleeved outside the valve stem (400), the lower end of which is connected to the valve core assembly (300), and the upper end of which is a clamping ring portion (531) located inside the linkage assembly, and a toughness gap (501) exists between the clamping ring portion (531) and the inner bottom surface of the linkage assembly; The claw assemblies are two and are symmetrically arranged with respect to the valve stem (400), and include a claw (541), a sealing slider (542), a buckle (543), and a claw spring (544); the claw (541) is arranged through the valve cover (200) and can move along the radial direction of the valve cover (200); the sealing slider (542) is arranged on the claw (541) and is slidably matched with the valve cover (200), so that a seal is formed between the claw (541) and the valve cover (200). A movable seal; a clamping hole (5411) is provided at the lower end of the clamping claw (541); a buckle (543) is arranged on the valve core assembly (300) and corresponds to the clamping claw portion on the upper side of the clamping hole (5411); the upper end of the clamping claw (541) penetrates into the linkage assembly; a clamping claw spring (544) is arranged in the linkage assembly and causes the upper end of the clamping claw (541) to abut against the clamping ring portion (531), and the height of the abutting portion is less than or equal to the width of the toughness gap (501); When the valve stem (400) breaks, the valve core assembly (300) falls and drives the clamping ring sleeve (530) and the buckle (543) to move downward, and the claw (541) is separated from the restriction of the clamping ring portion (531) and driven by the claw spring (544) to radially retract, so that the clamping hole (5411) can move toward the buckle (543) and cooperate with it.

2. A tough pressure control valve according to claim 1, characterized in that: A slide rail (220) is provided on the valve cover (200), and the sealing slider (542) is slidably matched with the valve cover (200) via the slide rail (220).

3. A tough pressure control valve according to claim 1, characterized in that: The linkage assembly comprises a linkage guide plate (510) and a linkage shaft sleeve (520); The linkage guide plate (510) is provided with a stepped hole and two radial slide grooves (513) symmetrical to the stepped hole; the stepped hole includes a valve stem through hole (511) and a snap ring countersunk hole (512); the radial slide groove (513) is connected to the upper part of the snap ring countersunk hole (512), and a first claw through hole (514) is provided at the bottom of the radial slide groove (513); the linkage guide plate (510) is sleeved outside the valve stem (400) through the valve stem through hole (511) and is located on the upper side of the valve cover (200); the valve cover (200) is provided with a second claw through hole (210) corresponding to the first claw through hole (514); The linkage shaft sleeve (520) is sleeved outside the valve stem (400) and can be linked with the valve stem (400), and the lower part of the linkage shaft sleeve is a guide plate cover (521) sleeved outside the linkage guide plate (510); The snap ring portion (531) is disposed in the snap ring counterbore (512) and corresponds to the radial slide groove (513); A claw horizontal handle is provided at the upper end of the claw (541), and the claw horizontal handle is slidably matched with the radial slide groove (513). The lower end of the claw (541) passes through the first claw through hole (514) and the second claw through hole (210) in sequence and extends into the valve body (100); a claw spring (544) is arranged between the outer end of the claw horizontal handle and the guide plate cover (521) and is in a compressed state. Under the action of its elastic force, the inner end of the claw horizontal handle abuts against the clamping ring portion (531).

4. A tough pressure control valve according to claim 3, characterized in that: The clamping hole (5411) is a tapered hole, and the end with a larger hole opening is close to the clamping buckle (543); The outer end of the buckle (543) is a conical elastic block adapted to the clamping hole (5411), and the conical elastic block can self-lock the buckle (543) after it is matched with the clamping hole (5411).

5. A tough pressure control valve according to claim 3, characterized in that: A vertical valve chamber and a valve seat (103) are provided in the valve body (100); the valve seat (103) divides the vertical valve chamber into an upper flow control chamber (101) and a lower buffer chamber (102); The side of the valve body (100) is provided with an inlet (104) connected to the buffer chamber (102), and an outlet (105) connected to the flow control chamber (101); The top opening of the valve body (100) is formed by the vertical valve cavity penetrating upward to the top surface of the valve body (100); The valve core assembly (300) is arranged in the vertical valve chamber and is in sealing contact with the valve seat (103); The valve stem (400) is arranged vertically, and can drive the valve core assembly (300) to move axially along the vertical valve cavity, so that the inlet (104) and the outlet (105) can switch between a connected state and a cut-off state.

6. A tough pressure control valve according to claim 5, characterized in that: The buffer cavity (102) is divided into a blind cavity section (1021), a front cavity section (1022), a matching section (1023) and a transition section (1024) from bottom to top, and the cross-sectional dimension of the matching section (1023) is smaller than the cross-sectional dimension of the front cavity section (1022) and smaller than the cross-sectional dimension of the transition section (1024); The valve core assembly (300) comprises an upper valve core (310), a lower valve core (320), an inner valve core (330) and a pressure spring (340); the upper valve core (310) is arranged in a flow control cavity (101) and cooperates with a valve seat (103); the lower valve core (320) comprises a lower valve core body (321) arranged in a transition section (1024) and connected to the lower end of the upper valve core (310), and a lower valve core support (322) connected to the lower end of the lower valve core body (321) and slidably cooperates with a blind cavity section (1021) and a cooperation section (1023); a first valve core annular gap cavity is formed between the lower valve core body (321) and the wall surface of the transition section (1024); an inverted tower-shaped inner cavity (3211) formed by coaxially connecting at least three inverted cone-shaped cavities is provided inside the lower valve core body (321); the upper end of the lower valve core body (321) is provided with a plurality of inverted tower-shaped cavities (3211) and a plurality of inverted tower-shaped cavities (3211) are provided with a plurality of inverted tower-shaped cavities (3211) and a plurality of inverted tower-shaped cavities (321) are provided with a plurality of inverted tower-shaped cavities (32 ... The first valve core outflow hole (3212) is provided in the upper part of the valve core for connecting the inverted tower-shaped inner cavity (3211) with the first valve core annular gap cavity; a second valve core annular gap cavity is formed between the lower valve core support (322) and the wall surface of the front cavity section (1022); the lower valve core support (322) has an inner cavity and is provided with a valve core inflow hole (3221) connected with the second valve core annular gap cavity and a second valve core outflow hole (3222) corresponding to the matching section (1023); the inner valve core (330) is axially movably arranged in the inverted tower-shaped inner cavity (3211), and the inner valve core (330) has an inverted cone structure corresponding to each inverted cone-shaped cavity of the inverted tower-shaped inner cavity (3211); the pressure spring (340) is arranged between the inner valve core (330) and the upper valve core (310) and is in a compressed state, so that the corresponding inverted cone structures are in sealing contact with the bottom inclined surface of the inverted cone-shaped cavity; The inlet port (104) is in communication with the second valve core annular gap cavity; The buckle (543) is arranged on the side of the upper valve core (310); The inner valve core (330) can perform lifting and lowering movements in response to the balance between the fluid pressure and the elastic force of the pressure spring (340), thereby forming the following multi-stage adjustment states: Initial state: the inner valve core (330) seals the inverted tower-shaped inner cavity (3211), the second valve core outflow hole (3222) is closed, and the valve core inflow hole (3221) is connected to the second valve core annular gap cavity; First-stage regulation state: the fluid pressure causes the inner valve core (330) to overcome the elastic force of the pressure spring (340) and rise, and a flow gap is left between the corresponding inverted cone structures and the bottom slope of the inverted cone-shaped cavity to form a multi-stage labyrinth cavity. After the fluid flows through the multi-stage labyrinth cavity and is decompressed, it flows into the first valve core annular gap cavity through the first valve core outlet hole (3212); Second-stage regulation state: the fluid gradually increases the pressure in the transition section (1024). When the preset pressure is reached, the fluid pushes the upper valve core (310) to drive the valve core assembly (300) to move upward as a whole, so that the inlet (104) is connected to the outlet (105). At the same time, the position of the second valve core outlet hole (3222) moves upward, and the fluid flows out from the first valve core outlet hole (3212) and the second valve core outlet hole (3222) in a mixed state. The third-stage regulating state: when the fluid pressure continues to increase, the second valve core outlet hole (3222) is fully opened, the valve core assembly (300) continues to rise, the valve core inlet hole (3221) moves upward and the opening gradually decreases, and the fluid passage is gradually reduced; Overpressure protection state: When the fluid pressure is too high, the valve core assembly (300) continues to be lifted, and the valve core inlet hole (3221) moves up to the matching section (1023) and is completely closed, thereby cutting off the fluid passage and entering the overpressure protection state.

7. A tough pressure control valve according to claim 6, characterized in that: The first valve core outflow holes (3212) are circular holes, of which there are at least three and are evenly distributed around the circumference of the lower half valve core body (321); The valve core inlet holes (3221) are rectangular holes opened along the axial direction of the lower valve core support (322), and there are at least three of them evenly distributed around the circumference of the lower valve core support (322); The second valve core outflow holes (3222) are rectangular holes, of which there are at least three and are evenly distributed around the circumference of the lower half valve core support (322).

8. A tough pressure control valve according to claim 6, characterized in that: A spring hole (311) is provided at the bottom of the upper valve core (310), and a pressure spring (340) is arranged in the spring hole (311).

9. A tough pressure control valve according to any one of claims 1 to 8, characterized in that: It also includes a solid impurity separation device (600); the solid impurity separation device (600) includes a filter tube (610), a valve tube (620), a propeller (630) and a storage box; The filter tube (610) is arranged vertically, and a filter screen structure (611) is provided on the filter tube; The valve pipe (620) is sleeved on the outside of the filter pipe (610) and forms a separation chamber (621) between the valve pipe and the filter screen structure (611). The valve pipe (620) is provided with an outflow pipe (622) that connects the separation chamber (621) with the inner chamber of the valve body (100). The bottom of the valve pipe (620) is provided with a sand discharge port (623) that is correspondingly connected to the inner chamber of the filter pipe (610). The propeller (630) is rotatably disposed in the inner cavity of the filter tube (610) and remains coaxial with the filter tube (610); The storage box is arranged at the lower side of the valve pipe (620), and the box opening is connected to the sand discharge port (623).

10. A tough pressure control valve according to claim 9, characterized in that: The filter screen structure (611) is mainly composed of a plurality of evenly distributed filter screen holes opened at the lower part of the filter tube (610); A paddle rack (612) is provided at the upper portion of the inner cavity of the filter tube (610), and a propeller (630) is rotatably disposed on the paddle rack (612).

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