A resilient pressure control valve

Abstract

The present invention discloses a tough pressure control valve, which relates to the field of valve technology and aims to solve the problem that the existing pressure control valve cannot repair the regulating function by itself when a valve stem breaks. The pressure control valve is provided with a valve stem toughness structure mainly composed of a linkage assembly, a clamping ring sleeve and a claw assembly. When the valve stem breaks, the valve core assembly will fall downward due to the loss of the direct pulling effect of the valve stem and drive the clamping ring sleeve and the buckle to move downward. When the clamping ring sleeve moves downward to eliminate the toughness gap, it will temporarily pull the valve core assembly. At this time, the buckle is opposite to the clamping hole on the corresponding claw; at the same time, due to the downward movement of the clamping ring sleeve, the claw is separated from the restriction of the clamping ring part and is driven by the claw spring to radially close, 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 replace the broken valve stem to transmit the regulating force to the valve core assembly, thereby realizing the self-repair of the valve regulating function.

Description

Technical Field

[0001] The present invention belongs to the technical field of valves, and particularly 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 fluid in a pipeline. It mainly works based on the principle of fluid mechanics and controls the pressure of the fluid by adjusting the opening degree of the valve. For the adjustment of the valve opening degree, the force balance principle is usually adopted, that is: when the pressure of the fluid medium acts on the valve core, the valve core will be displaced under the action of 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 maintain a balanced position, thereby realizing the stable control of the fluid pressure.

[0003] The current improvement schemes for pressure control valves mainly focus on the design of the valve core and the valve body passage of the valve. For example: the Chinese patent application for invention with the publication number CN113108070A discloses a multi-stage pressure reduction series type liquid level regulating valve structure; there is a valve seat in the vertical cavity of the valve body. The upper and lower parts of the valve seat are respectively a throttling valve core cylindrical cavity and a buffer cylindrical cavity. There is a valve core sleeve in the throttling valve core cylindrical cavity. The valve core sleeve sleeves the valve seat, and the valve core is installed on the valve core sleeve. A multi-stage series type pressure reduction structure is arranged between the valve core and the valve core sleeve; there is a valve cover on the valve body, and the valve cover axially presses the valve core sleeve on the valve seat; the fluid medium flows from the inlet of the valve body to the buffer cylindrical cavity, flows through the central through hole of the valve seat and then flows into the throttling valve core cylindrical cavity, and flows out from the through hole on the upper end side wall of the valve core sleeve to the commutation gap between the valve body and the valve core sleeve, and converges to flow out from the outlet of the valve body. The above multi-stage pressure reduction series type liquid level regulating valve structure optimizes the valve structure according to the service environment and structural characteristics of the high-pressure difference liquid level control valve, which is beneficial to extending the service life and the safe and stable operation period of the high-pressure difference liquid control valve.

[0004] Although the above-mentioned structure of a multi-stage step-down series liquid level regulating valve improves the service life and stability of the valve through special design of the valve core, it only conducts a separate buffer design. In the existing transportation of oil and gas, due to the uneven treatment degree of oil and gas, the fluid pressure in the pipeline often becomes unstable, fluctuates, affects the opening and closing of the valve port, and when the fluid pressure is too high, feedback self-regulation cannot be achieved. Moreover, during the use of the pressure control valve, pressure overload may occur, damaging and breaking the relatively fragile valve stem. In the face of the valve stem breakage fault, the valve cannot take autonomous measures to repair and regulate its function by itself, and manual intervention and maintenance are required, consuming more time and manpower. In addition, the existing pressure control valve only considers the influence of the high pressure of the fluid on the working condition of the valve, and does not consider other influencing factors, such as the influence of impurities in the fluid. If there are incompletely treated solid debris impurities, it will cause blockage of the valve flow channel at least and damage the valve core at worst. The damage caused by the above two situations can only be maintained manually, affecting the operation progress and being time-consuming and laborious. 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 and regulate its function by itself when the valve stem breaks.

[0006] The technical solution adopted by the present invention to solve its technical problems is: a pressure control valve with toughness, including a valve body with a top port, a valve cover arranged at the top port, 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;

[0007] It further includes a valve stem toughness structure; the valve stem toughness structure includes a linkage assembly, a snap ring sleeve, and a claw assembly;

[0008] 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;

[0009] The snap ring sleeve is sleeved outside the valve stem, its lower end is connected to the valve core assembly, its upper end is a snap ring part located inside the linkage assembly, and there is a toughness gap between the snap ring part and the inner bottom surface of the linkage assembly;

[0010] There are two claw assemblies symmetrically arranged with respect to the valve stem. The claw assembly includes a claw, a sealing slider, a buckle, and a claw spring; the claw passes through the valve cover and can move radially along the valve cover; the sealing slider is arranged on the claw and is slidably matched with the valve cover, forming a movable seal between the claw and the valve cover; a card hole is provided at the lower end of the claw, the buckle is arranged on the valve core assembly and corresponds to the claw part above the card hole; the upper end of the claw penetrates into the interior of the linkage assembly, the claw spring is arranged inside the linkage assembly and makes the upper end of the claw abut against the snap ring part, and the height of the abutting part between the claw and the snap ring part is less than or equal to the width of the toughness gap;

[0011] 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.

[0012] 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.

[0013] Further, the linkage assembly includes a linkage guide plate and a linkage sleeve;

[0014] 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;

[0015] 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;

[0016] The snap ring portion is arranged in the snap ring counterbore and corresponds to the radial slide groove;

[0017] 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.

[0018] Furthermore, the clamping hole is a tapered hole, and the end with a larger hole opening is close to the buckle;

[0019] 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.

[0020] 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;

[0021] 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;

[0022] The top opening of the valve body is formed by the vertical valve cavity penetrating upward to the top surface of the valve body;

[0023] The valve core assembly is arranged in the vertical valve cavity and is in sealing contact with the valve seat;

[0024] 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.

[0025] Further, the buffer cavity is sequentially divided into a blind cavity section, a front cavity section, a mating section, and a transition section from bottom to top. The cross-sectional dimension of the mating section is smaller than that of the front cavity section and smaller than that of the transition section;

[0026] The spool assembly includes an upper spool, a lower spool, an inner spool, and a pressure spring. The upper spool is arranged in the flow control cavity and cooperates with the valve seat. The lower spool includes a lower spool body arranged in the transition section and connected to the lower end of the upper spool, and a lower spool support pillar connected to the lower end of the lower spool body and slidably cooperating with the blind cavity section and the mating section. A first spool annular gap cavity is formed between the lower spool body and the wall surface of the transition section. An inverted tower-shaped inner cavity formed by coaxially connecting at least three inverted frustum-shaped cavities is arranged inside the lower spool body. A first spool outflow hole communicating the inverted tower-shaped inner cavity with the first spool annular gap cavity is arranged at the upper part of the lower spool body. A second spool annular gap cavity is formed between the lower spool support pillar and the wall surface of the front cavity section. The lower spool support pillar has an inner cavity, and a spool inflow hole communicating with the second spool annular gap cavity and a second spool outflow hole corresponding to the mating section are arranged thereon. The inner spool is axially movably arranged in the inverted tower-shaped inner cavity, and the inner spool has an inverted frustum structure corresponding to each inverted frustum-shaped cavity of the inverted tower-shaped inner cavity. The pressure spring is arranged between the inner spool and the upper spool and is in a compressed state, so that the corresponding inverted frustum structures are in sealing contact with the bottom inclined surfaces of the inverted frustum-shaped cavities;

[0027] The inlet is communicated with the second spool annular gap cavity;

[0028] The buckle is arranged on the side of the upper spool;

[0029] Wherein, the inner spool can perform lifting movement in response to the balance of the fluid pressure and the elastic force of the pressure spring, forming the following multi-stage adjustment states:

[0030] Initial state: The inner spool seals the inverted tower-shaped inner cavity, the second spool outflow hole is closed, and the spool inflow hole is communicated with the second spool annular gap cavity;

[0031] First-stage adjustment state: The fluid pressure causes the inner spool to lift against the elastic force of the pressure spring, and an overflow gap is left between the corresponding inverted frustum structures and the bottom inclined surfaces of the inverted frustum-shaped cavities to form a multi-stage maze channel. The fluid flows through the multi-stage maze channel, is shunted and depressurized, and then flows into the first spool annular gap cavity through the first spool outflow hole;

[0032] Second-stage adjustment state: The fluid gradually increases the pressure in the transition section. When the preset pressure is reached, the fluid pushes the upper spool to drive the entire spool assembly to move upward. The inlet is communicated with the outlet. At the same time, the position of the second spool outflow hole moves upward, and the fluid flows out after mixing from the first spool outflow hole and the second spool outflow hole;

[0033] Third - stage regulation state: When the fluid pressure continues to increase, the outflow holes of the second valve core are fully opened, the valve core assembly continues to rise, the inflow holes of the valve core move upward and the opening gradually decreases, and the fluid passage is gently reduced.

[0034] Over - pressure protection state: When the fluid pressure is too high, the valve core assembly continues to be lifted, the inflow holes of the valve core move upward until the mating section is completely closed, cutting off the fluid passage and entering the over - pressure protection state.

[0035] Furthermore, the outflow holes of the first valve core are circular holes, and there are at least three of them, which are evenly distributed circumferentially around the lower half of the valve core body.

[0036] The inflow holes of the valve core are rectangular holes axially opened along the lower half of the valve core strut, and there are at least three of them, which are evenly distributed circumferentially around the lower half of the valve core strut.

[0037] The outflow holes of the second valve core are rectangular holes, and there are at least three of them, which are evenly distributed circumferentially around the lower half of the valve core strut.

[0038] Furthermore, a spring hole is provided at the bottom of the upper half of the valve core, and a pressure spring is arranged in the spring hole.

[0039] Furthermore, the pressure - control valve further includes a solid - impurity separation device; the solid - impurity separation device includes a filter pipe, a valve pipe, a propeller, and a storage tank.

[0040] The filter pipe is arranged vertically, and a filter - screen structure is provided thereon.

[0041] The valve pipe is sleeved outside the filter pipe, and a separation chamber is formed between the valve pipe and the filter - screen structure. An outflow pipeline for connecting the separation chamber with the inner cavity of the valve body is provided on the valve pipe, and a sand - discharging port corresponding to and communicating with the inner cavity of the filter pipe is provided at the bottom of the valve pipe.

[0042] The propeller is rotatably arranged in the inner cavity of the filter pipe and is coaxial with the filter pipe.

[0043] The storage tank is arranged on the lower side of the valve pipe, and its tank opening is connected to the sand - discharging port.

[0044] Furthermore, the filter - screen structure is mainly composed of a plurality of evenly - distributed filter - screen holes opened in the lower part of the filter pipe.

[0045] An oar - frame is provided in the upper part of the inner cavity of the filter pipe, and the propeller is rotatably arranged on the oar - frame.

[0046] 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.

[0047] 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

[0048] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0049] Figure 2 is a partial cross-sectional view of the present invention;

[0050] Figure 3 yes Figure 2 A partial enlarged view of the middle A;

[0051] Figure 4 is along Figure 2 Sectional view along the midline BB;

[0052] Figure 5 yes Figure 4 A partial enlarged view of point C in the middle;

[0053] Figure 6 yes Figure 4 A partial enlarged view of point D in the middle;

[0054] Figure 7 It is a schematic diagram of the three-dimensional structure of the valve cover in the present invention;

[0055] Figure 8 It is a schematic diagram of the three-dimensional structure of the linkage guide plate in the present invention;

[0056] Figure 9 is a cross-sectional view of a solid impurity separation device in the present invention;

[0057] The markings in the figure are: 100 - valve body, 101 - flow control cavity, 102 - buffer cavity, 1021 - blind cavity section, 1022 - front cavity section, 1023 - mating section, 1024 - transition section, 103 - valve seat, 104 - inlet port, 105 - outlet port, 200 - valve cover, 210 - second jaw 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 ductile structure, 501 - ductile gap, 510 - linkage guide disc, 511 - valve stem through - hole, 512 - snap - ring counterbore, 513 - radial chute, 514 - first jaw through - hole, 520 - linkage bushing, 521 - guide disc cover, 530 - snap - ring sleeve, 531 - snap - ring part, 541 - jaw, 5411 - clamping hole, 542 - sealing slider, 543 - buckle, 544 - jaw spring, 600 - solid impurity separation device, 610 - filter pipe, 611 - filter screen structure, 612 - paddle frame, 620 - valve pipe, 621 - separation cavity, 622 - outlet pipe, 623 - sand discharge port, 630 - propeller. Detailed implementation mode

[0058] The present invention will be further described below with reference to the accompanying drawings and embodiments. The same reference numerals in the drawings denote components with the same or similar functions. Although various aspects of the embodiments are shown in the drawings, unless otherwise specified, the drawings do not have to be drawn to scale.

[0059] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "head", "tail", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or position and dimensional relationship based on the orientation or position relationship shown in the drawings, and are only for the convenience of description, rather than indicating or implying that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present invention.

[0060] 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 use on its own after failure or damage; for example: after the valve stem 400 breaks, the valve stem toughness structure 500 takes over the broken valve stem 400 to transmit the control force to the valve core assembly 300, realizing the self-repair of the valve control function. When the term "multiple" indicates a quantity, it usually means a quantity of three or more; for example: "multiple" usually means three or more. The expression of "mainly composed of..." is interpreted as that it may also contain structural components not mentioned in this sentence. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0061] Combined with Figure 1 、 Figure 2 、 Figure 4 、 Figure 5 、 Figure 6 、 Figure 7 and Figure 8 As shown in

[0062] This pressure control valve with toughness further includes a valve stem toughness structure 500; the valve stem toughness structure 500 includes a linkage assembly, a snap ring sleeve 530, and a claw assembly;

[0063] The linkage assembly is sleeved on the rod 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 by connecting to the same actuator as the valve stem 400, or can also be indirectly connected to the valve stem 400 through a transmission mechanism to achieve linkage;

[0064] The snap ring sleeve 530 is sleeved outside the valve stem 400, its lower end is connected to the valve core assembly 300, and its upper end is a snap ring part 531 located inside the linkage assembly. There is a toughness gap 501 between the snap ring part 531 and the inner bottom surface of the linkage assembly; the toughness gap 501 is a redundant space for the snap ring sleeve 530 to move downward relative to the linkage assembly, mainly used to ensure that after the valve stem 400 breaks, the snap ring part 531 can vacate the position blocking the claw 541 to trigger the valve stem toughness structure 500, and can limit the downward movement distance of the snap ring sleeve 530 and the valve core assembly 300 connected thereto to ensure that the buckle 543 can be accurately aligned with the card hole 5411;

[0065] There are two jaw components, which are symmetrically arranged with respect to the valve stem 400. The jaw component includes a jaw 541, a sealing slider 542, a buckle 543 and a jaw spring 544; the jaw 541 passes through the valve cover 200 and can move radially along the valve cover 200, that is: the opening on the valve cover 200 for the jaw 541 to pass through has a size along the radial direction of the valve cover 200 that is larger than the size of the jaw 541 along the radial direction of the valve cover 200; the sealing slider 542 is arranged on the jaw 541 and is in sliding fit with the valve cover 200 to form a movable seal between the jaw 541 and the valve cover 200; a clamping hole 5411 is provided at the lower end of the jaw 541, and the buckle 543 is arranged on the valve core assembly 300 and corresponds to the jaw part above the clamping hole 5411. The distance between the jaw part and the clamping hole 5411 is generally the width of the resilient gap 501; the upper end of the jaw 541 penetrates into the linkage assembly, and the jaw spring 544 is arranged in the linkage assembly and makes the upper end of the jaw 541 abut against the snap ring part 531, and the height of the abutting part between the jaw 541 and the snap ring part 531 is less than or equal to the width of the resilient gap 501, so as to ensure that the snap ring part 531 can give way to the position blocking the jaw 541 after the snap ring sleeve 530 moves down; the jaw spring 544 is usually arranged between the upper end of the jaw 541 and the inner wall of the linkage assembly;

[0066] When the pressure control valve is working normally, the linkage assembly and the valve stem 400 are linked, and their relative positions remain unchanged; the jaw component is relatively stationary with respect to the valve core assembly 300 in the vertical direction. The lower part of the jaw 541 is outside the valve core assembly 300 and does not interfere with its normal opening and closing. Due to the elastic force of the jaw spring 544, the jaw 541 has a tendency to contract inward in the radial direction of the valve, but is blocked by the snap ring part 531; the snap ring sleeve 530 is clamped by two jaws 541 and is not affected by the stress inside the valve stem 400;

[0067] When the valve stem 400 breaks, the valve core assembly 300 will fall downward due to the loss of the direct pulling action of the valve stem 400 and drive the snap ring sleeve 530 and the buckle 543 to move down. When the snap ring sleeve 530 moves down to eliminate the resilient gap 501, it will temporarily hold the valve core assembly 300. At this time, the buckle 543 is directly opposite to the clamping hole 5411 on the corresponding jaw 541; at the same time, since the snap ring sleeve 530 moves down, the jaw 541 is released from the restriction of the snap ring part 531 and is driven by the jaw spring 544 to radially contract. Then, the clamping hole 5411 can move towards the buckle 543 and cooperate with it to form a snap connection, so that the valve stem resilient structure 500 can take over the broken valve stem 400 to transmit the control force to the valve core assembly 300 and realize the self-repair of the valve control function.

[0068] Because the valve stem 400 is vulnerable to fluid impact when the pressure control valve is in the overall open state, the fracture failure of the valve stem 400 mainly occurs in its overall open state, that is, when the valve core assembly 300 moves upward away from the valve seat 103. If the valve stem 400 fractures when the pressure control valve is in the closed state, the ductile structure 500 of the valve stem can still be triggered and play the above-mentioned redundant role when the actuator subsequently lifts the valve stem 400, realizing the self-repair of the valve regulation function.

[0069] Combined with 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 engaged with the valve cover 200 through the slide rail 220. Through the slide rail 220, not only can the sealing slider 542 and the claw 541 connected to the sealing slider 542 be guided, and the stability of the installation of the claw 541 be improved, but also the friction between the sealing slider 542 and the valve cover 200 can be reduced, improving the performance and service life of the movable seal.

[0070] Combined with Figure 2 , Figure 4 , Figure 5 , Figure 7 and Figure 8As shown, in some embodiments, the linkage assembly includes a linkage guide disk 510 and a linkage sleeve 520; the linkage guide disk 510 can be of various shapes, preferably disk-shaped; the linkage guide disk 510 is provided with a stepped hole and two radial sliding grooves 513 symmetric to the stepped hole, and the radial sliding grooves 513 are generally arranged along the radial direction of the valve; the stepped hole includes a valve stem through hole 511 and a snap ring counterbore 512 located above the valve stem through hole 511, and the bottom surface of the snap ring counterbore 512 is the inner bottom surface of the linkage assembly; the radial sliding grooves 513 communicate with the upper part of the snap ring counterbore 512, and a first claw through hole 514 is provided at the bottom of the radial sliding grooves 513; the linkage guide disk 510 is sleeved outside the valve stem 400 through the valve stem through hole 511 and is located above the valve cover 200; a second claw through hole 210 corresponding to the first claw through hole 514 is provided on the valve cover 200; the linkage sleeve 520 is sleeved outside the valve stem 400 and can be linked with the valve stem 400, and its lower part is a guide disk cover 521 sleeved outside the linkage guide disk 510; a snap ring part 531 is arranged in the snap ring counterbore 512 and corresponds to the radial sliding grooves 513; generally, the main body part of the linkage sleeve 520 is a sleeve structure, which is coaxially arranged with the valve stem 400, and linkage is realized by fixedly connecting the main body part with the valve stem 400, and the linkage guide disk 510 is also connected with the valve stem 400 through the lower guide disk cover 521, so that the linkage guide disk 510 also keeps relatively static with the valve stem 400 axially; the upper end of the claw 541 is provided with a claw horizontal handle, that is, the claw 541 is in an inverted "L" shape structure, the claw horizontal handle is slidably matched with the radial sliding groove 513, and the lower end of the claw 541 sequentially passes through the first claw through hole 514 and the second claw through hole 210 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 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 snap ring part 531.

[0071] Combined with 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 is in clearance fit with the valve stem 400, and the fit clearance between the two is usually less than 0.05 mm; the snap ring part 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 by threads.

[0072] In order to facilitate the cooperation and connection between the buckle 543 and the card hole 5411 and ensure the reliability of the connection, combined with Figure 4 and Figure 6As shown, in some embodiments, the card hole 5411 is a tapered hole, and the end with a larger orifice is close to the snap 543; the outer end of the snap 543 is a tapered elastic block adapted to the card hole 5411, and the tapered elastic block can self-lock after the snap 543 and the card hole 5411 are engaged. The tapered elastic block is usually made of an elastic material, which has the ability of elastic deformation. It can be deformed during the process of being inserted into the card hole 5411 to facilitate insertion and avoid rigid collision. After being inserted into the card hole 5411, it can return to its original state to form a snap connection with the card hole 5411 and achieve self-locking.

[0073] Combined with Figure 2 、 Figure 3 and Figure 4 As shown in FIGS. 1, 2 and 4, in some embodiments, a vertical valve cavity and a valve seat 103 are provided in the valve body 100. The valve seat 103 divides the vertical valve cavity into an upper flow control cavity 101 and a lower buffer cavity 102; an inlet port 104 communicating with the buffer cavity 102 and an outlet port 105 communicating with the flow control cavity 101 are provided on the side of the valve body 100; the top port of the valve body 100 penetrates upward from the vertical valve cavity to the top surface of the valve body 100; the valve core assembly 300 is disposed in the vertical valve cavity and is in sealed contact with the valve seat 103; the valve rod 400 is vertically disposed and can drive the valve core assembly 300 to move along the axial direction of the vertical valve cavity so as to switch the inlet port 104 between a communicating state and a cut-off state with the outlet port 105.

[0074] Combined with FIGS. 1, 2 and 4, in some embodiments, the flow control cavity 101 has an ellipsoidal chamber, and the cross-sectional dimension of the ellipsoidal chamber is larger than the cross-sectional dimension of other parts of the flow control cavity 101. The ellipsoidal chamber can increase the area and spatial volume of the flow-through cross-section, effectively reduce the velocity of the fluid, thereby reducing the impact of the fluid on the valve rod 400, and can also increase the strength of the valve body 100 and is also convenient for processing and manufacturing.

[0075] Combined with Figure 2 、 Figure 3 、 Figure 4 and Figure 6As shown, in some embodiments, the buffer chamber 102 is sequentially divided into a blind chamber section 1021, a front chamber section 1022, a mating section 1023, and a transition section 1024 from bottom to top. The cross-sectional dimension of the mating section 1023 is smaller than that of the front chamber section 1022 and smaller than that of the transition section 1024. The valve core assembly 300 includes an upper half valve core 310, a lower half valve core 320, an inner valve core 330, and a pressure spring 340. The upper half valve core 310 is disposed in the flow control chamber 101 and cooperates with the valve seat 103. The lower half valve core 320 includes a lower half valve core body 321 disposed in the transition section 1024 and connected to the lower end of the upper half valve core 310, and a lower half valve core support 322 connected to the lower end of the lower half valve core body 321 and slidably cooperating with the blind chamber section 1021 and the mating section 1023. A first valve core annular gap chamber is formed between the lower half 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 frustum-shaped cavities is provided inside the lower half valve core body 321. A first valve core outflow hole 3212 communicating the inverted tower-shaped inner cavity 3211 with the first valve core annular gap chamber is provided at the upper part of the lower half valve core body 321. A second valve core annular gap chamber is formed between the lower half valve core support 322 and the wall surface of the front chamber section 1022. The lower half valve core support 322 has an inner cavity, and a valve core inflow hole 3221 communicating with the second valve core annular gap chamber and a second valve core outflow hole 3222 corresponding to the mating section 1023 are provided thereon. The inner valve core 330 is axially movably disposed in the inverted tower-shaped inner cavity 3211, and the inner valve core 330 has an inverted frustum structure corresponding to each inverted frustum-shaped cavity of the inverted tower-shaped inner cavity 3211. The pressure spring 340 is disposed between the inner valve core 330 and the upper half valve core 310 and is in a compressed state, so that the corresponding inverted frustum structures are in sealing contact with the bottom inclined surfaces of the inverted frustum-shaped cavities. The inflow port 104 is communicated with the second valve core annular gap chamber. The buckle 543 is disposed on the side of the upper half valve core 310.

[0076] Wherein, the inner valve core 330 can perform a lifting movement in response to the balance between the fluid pressure and the elastic force of the pressure spring 340, forming the following multi-stage adjustment states:

[0077] Initial state: The valve core assembly 300 is in sealing contact with the valve seat 103 through the upper half valve core 310. The lower half valve core support 322 is slidably mated with the blind chamber section 1021 and the mating section 1023. The inner valve core 330 seals the inverted tower-shaped inner cavity 3211. The second valve core outflow hole 3222 is closed. The valve core inflow hole 3221 is communicated with the second valve core annular gap chamber. The fluid can flow into the valve core assembly 300 from the valve core inflow hole 3221. However, under the elastic force of the pressure spring 340, the flow channel in the valve core assembly 300 is in a cut-off state.

[0078] First - stage regulation state: As the fluid pressure gradually increases, the inner valve core 330 is lifted to overcome the elastic force of the pressure spring 340, leaving an overflow gap between the corresponding inverted frustum structure and the bottom inclined surface of the inverted frustum - shaped cavity to form a multi - stage maze cavity channel. The fluid flows through the multi - stage maze cavity channel, and the pressure and speed are reduced under the blocking effect of each inverted frustum structure, effectively reducing the impact of the fluid. When the fluid pressure fluctuates, the multi - stage maze cavity channel can also play a role in stabilizing the pressure. After the fluid is shunted and the pressure is reduced, it flows into the first valve core annular gap cavity through the first valve core outflow hole 3212 for secondary storage, realizing the buffering of the fluid again.

[0079] Second - stage regulation state: As the fluid continues to flow in, the first valve core annular gap cavity is filled, and the fluid causes the pressure of the transition section 1024 to gradually increase. When the preset pressure is reached, the fluid pushes the upper half valve core 310 away from the valve seat 103 and drives the entire valve core assembly 300 to move upward. The inlet port 104 is communicated with the outlet port 105, and the pressure - control valve is fully opened. At the same time, the position of the second valve core outflow hole 3222 moves upward and is communicated with the first valve core annular gap cavity, and the fluid flows out after mixing from the first valve core outflow hole 3212 and the second valve core outflow hole 3222.

[0080] Third - stage regulation state: When the fluid pressure continues to increase, the second valve core outflow hole 3222 is fully opened, the valve core assembly 300 continues to rise, the valve core inlet hole 3221 moves upward and its opening gradually decreases, and the total inlet cross - section gradually decreases accordingly. The fluid passage is smoothly reduced without sharp changes, ensuring good pressure - reducing, pressure - stabilizing, and flow - stabilizing effects under high - pressure fluid conditions.

[0081] Over - pressure 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 upward until the mating section 1023 is completely blocked, cutting off the fluid passage and entering the over - pressure protection state.

[0082] The above - mentioned pressure - control valve realizes multiple buffering of the fluid through structures such as the multi - stage maze cavity channel and the transition section 1024. By regulating the opening degree at the mating part of the valve core assembly 300 and the valve seat 103, the pressure - control valve has a better pressure - stabilizing and flow - stabilizing effect of feedback regulation.

[0083] To increase the total outflow area and ensure the flow - control accuracy, as shown in Figure 2 、 Figure 3 and Figure 4 In some embodiments, the first valve core outflow hole 3212 is a circular hole, and there are at least three of them, which are evenly distributed around the circumference of the lower half valve core body 321. Preferably, the number of the first valve core outflow holes 3212 is four.

[0084] Preferably, as shown in Figure 2 、 Figure 3 and Figure 4As shown, in some embodiments, the outflow holes 3222 of the second valve core are rectangular holes, with at least three of them evenly distributed circumferentially around the lower valve core support column 322. Preferably, the number of the outflow holes 3222 of the second valve core is six.

[0085] To increase the total inflow area and ensure the flow control accuracy, in combination with Figure 2 、 Figure 3 and Figure 4 As shown, in some embodiments, the inflow holes 3221 of the valve core are rectangular holes axially opened along the lower valve core support column 322, with at least three of them evenly distributed circumferentially around the lower valve core support column 322. Preferably, the number of the inflow holes 3221 of the valve core is six.

[0086] To facilitate the installation of the pressure spring 340 and radially constrain it to prevent it from deflecting laterally when stressed, in combination with Figure 2 、 Figure 3 and Figure 4 As shown, in some embodiments, a spring hole 311 is provided at the bottom of the upper half valve core 310, and the pressure spring 340 is arranged in the spring hole 311.

[0087] In combination with Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 and Figure 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 pipe 610, a valve pipe 620, a propeller 630 and a storage tank; the filter pipe 610 is arranged vertically, and a filter screen structure 611 is provided thereon; the valve pipe 620 is sleeved outside the filter pipe 610 and a separation chamber 621 is formed between it and the filter screen structure 611, an outflow pipeline 622 for communicating the separation chamber 621 with the inner cavity of the valve body 100 is provided on the valve pipe 620, and a sand discharge port 623 corresponding to and communicating with the inner cavity of the filter pipe 610 is provided at the bottom of the valve pipe 620; the propeller 630 is rotatably arranged in the inner cavity of the filter pipe 610 and is coaxial with the filter pipe 610; the storage tank is arranged on the lower side of the valve pipe 620, and its tank opening is connected to the sand discharge port 623. Generally, flange structures for connection are provided at the outer ends of both the filter pipe 610 and the valve pipe 620 to facilitate connection with external pipelines and the like.

[0088] The solid impurity separation device 600 can use the spiral centrifugal separation method to separate solid impurities in the fluid before the fluid enters the valve body 100, so as to reduce the risk of blockage of the valve core assembly 300 and improve the safety and durability of the pressure control valve operation. Specifically, during normal use, the solid impurity separation device 600 is vertically arranged, and the fluid enters from the upper end of the filter pipe 610 and impacts the blades of the propeller 630, driving the propeller 630 to rotate; the fluid forms a swirling flow under the driving of the rotating propeller 630, and the solid impurities are blocked by the filter screen structure 611 and cannot enter the separation chamber 621; the fluid enters the separation chamber 621 after being filtered by the filter screen structure 611 and enters the valve body 100 through the outflow pipe 622; the solid impurities that do not pass through the filter screen structure 611 fall along the inner wall of the filter pipe 610 and are discharged into the storage tank through the sand discharge port 623. Moreover, since the solid impurity separation device 600 uses the spiral centrifugal separation method to remove impurities, during the process of separating solid impurities, the swirling fluid tangentially flushes the surface of the filter screen structure 611, which can make the impurities adsorbed on the filter screen structure 611 fall off. Compared with the traditional flat filter screen, the filter screen structure 611 is not easily blocked and has a longer service life.

[0089] For example, in order to improve the filtering effect Figure 9 As shown, in some embodiments, the filter screen structure 611 is mainly composed of a plurality of uniformly distributed filter holes opened in the lower part of the filter pipe 610. The aperture of the filter holes is generally smaller than the minimum particle size of the target solid impurities to be separated.

[0090] For example, in order to facilitate the installation of the propeller 630 Figure 9 As shown, in some embodiments, a propeller support 612 is provided in the upper part of the inner cavity of the filter pipe 610, and the propeller 630 is rotatably arranged on the propeller support 612. Preferably, the propeller 630 is a four-blade propeller.

[0091] This document presents a description of various embodiments of the present invention only for the purpose of illustration, 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. Compared with the technologies found in the market, the terms used in this document are selected to best explain the principles of the embodiments, practical applications, or technological progress, or to enable other skilled artisans in the art to understand the embodiments disclosed herein.

[0092] It should be understood that, for clarity, certain features of the invention described in the context of separate embodiments may also be provided in combination in a single embodiment. Conversely, for brevity, the various features of the invention described in the context of a single embodiment may also be provided separately 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 to be considered essential features of those embodiments unless the embodiment cannot function without those features.

[0093] All publications, patents, and patent applications mentioned herein are hereby incorporated by reference in their entirety as if each individual publication, patent, or patent application was specifically and individually indicated to be incorporated by reference. Additionally, the citation or identification of any reference in this text should not be construed as an admission that such reference is available as prior art to the present invention. With respect to the use of section headings, 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; characterized in that: Also included is a valve stem toughness structure (500); 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); 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); a flow inlet (104) and a flow outlet (105) connected to the flow control cavity (101) are provided on the side of the valve body (100); 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 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 the flow control cavity (101) and is matched with the valve seat (103); the lower valve core (320) comprises a valve core (330) which is arranged in the transition section (1024) and is connected to the lower end of the upper valve core (310); A lower valve core body (321), 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 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 part of the valve core support (321) is provided with a first valve core outflow hole (3212) 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 inlet (104) is connected with the second valve core annular gap cavity; 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 gap cavity and a matching section (1023) The inner valve core (330) is axially movable 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 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, the valve core inlet hole (3221) moves up to the matching section (1023) and is completely closed, thus cutting off the fluid passage and entering the overpressure protection state; 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) are switched between a connected state and a cut-off state; The valve stem toughness structure (500) comprises 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 movable seal is formed between the claw (541) and the valve cover (200); the claw (541) is provided with a plurality of springs and ... A clamping hole (5411) is provided at the lower end of the upper valve core (310), and a buckle (543) is arranged on the side of the upper valve core (310) and corresponds to a clamping claw portion on the upper side of the clamping hole (5411); the upper end of the clamping claw (541) penetrates into the linkage component, and a clamping claw spring (544) is arranged in the linkage component so that the upper end of the clamping claw (541) abuts against the clamping ring portion (531), and the height of the abutting portion of the clamping claw (541) and the clamping ring portion (531) 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 1, 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).

6. A tough pressure control valve according to claim 1, 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).

7. A tough pressure control valve according to any one of claims 1 to 6, 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).

8. A tough pressure control valve according to claim 7, characterized in that: The filter screen structure (611) is 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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