High-pressure erosion-resistant check valve

Abstract

The high-pressure erosion-resistant check valve relates to the technical field of check valves and comprises a valve body, a valve cavity is formed in the center of the valve body, a valve element is slidably connected to one side of the valve cavity, and a first spring is connected between the valve element and the inner wall of the valve cavity; the pressure regulating piece is slidably connected to the other side of the valve cavity, a fluid channel is formed in the center of the pressure regulating piece, and the end of the valve element is connected to one end of the fluid channel in a sealed mode. According to the check valve, the first spring is connected with the valve element, the one-way conduction function of the check valve is effectively achieved, and the reset capacity of the valve element is improved; the pressure adjusting part is arranged in the valve cavity, the position of the pressure adjusting part is automatically adjusted according to the pressure in the valve cavity, the elastic force of the first spring acting on the valve element is changed, then the gap between the valve element and the pressure adjusting part is adjusted, pressure adjustment and compensation are achieved when fluid flows out of the valve cavity, the pressure stabilizing effect of the check valve is improved, and the check valve is effectively suitable for the high-pressure environment during oil exploitation.

Description

Technical Field

[0001] The present invention relates to the technical field of check valves, and more particularly to a high-pressure erosion-resistant check valve. Background Art

[0002] Check valves, also known as non-return valves, are used in hydraulic systems to prevent reverse flow of oil, or in pneumatic systems to prevent reverse flow of compressed air. During the production process of oil wells, check valves are installed in the tubing string to ensure that oil can only flow from the formation to the surface equipment without backflow, thus protecting the oil pumps, screw pumps and other equipment downhole.

[0003] In the prior art, for example, the utility model patent with application number CN202223400902.3 discloses a forced reset and erosion-resistant downhole check valve, including a valve body, one end of which is connected to a joint; a valve core is provided in the valve body, a plurality of through holes are formed on the valve core, and a reset spring is provided between the valve body and the valve core; a hard alloy layer is formed at the end of the valve core near one end of the joint; a hard alloy layer is also provided at the inner wall of the joint corresponding to the hard alloy layer of the valve core. This device can monitor the position pressure, and when the internal reset spring fails or the elasticity is reduced, the electrical pump on the well is controlled by an electrical signal to supplement the pressure of the hydraulic cylinder inside the equipment, thereby ensuring the application effect of the check valve.

[0004] However, in actual use, this type of one-flow valve introduces sensors and control equipment when performing pressure compensation. When installing the one-flow valve structure, the electronic control equipment also needs to be installed and debugged, which increases the cost and control difficulty.

[0005] Therefore, it is necessary to provide a high-pressure erosion-resistant check valve to at least partially solve the problems existing in the prior art. Summary of the invention

[0006] A series of simplified concepts are introduced in the Summary of the Invention, which will be further described in detail in the Detailed Description of the Invention. The Summary of the Invention does not mean to attempt to define the key features and essential technical features of the claimed technical solution, nor does it mean to attempt to determine the scope of protection of the claimed technical solution.

[0007] In order to at least partially solve the above problems, the present invention provides a high-pressure erosion-resistant check valve, comprising:

[0008] A valve body, wherein a valve cavity is arranged at the center of the valve body, a valve core is slidably connected to one side of the valve cavity, and a first spring is connected between the valve core and the inner wall of the valve cavity;

[0009] A pressure regulating member is slidably connected to the other side of the valve cavity, a fluid channel is arranged at the center of the pressure regulating member, and an end of the valve core is sealed and connected to one end of the fluid channel.

[0010] Preferably, the valve core includes: a flange, a through hole and a tapered end cap, the flange is concentrically connected to the valve core, and the first spring is connected between the flange and the inner wall of the valve cavity; a plurality of through holes are provided on the valve core and are evenly arranged along the circumferential direction; the tapered end cap is connected to one end of the valve core close to the pressure regulating member, and a tapered port adapted to the tapered end cap is provided at the end of the fluid channel.

[0011] Preferably, the surfaces of the conical end and the pressure regulating member are both provided with a hard alloy layer.

[0012] Preferably, the high-pressure erosion-resistant check valve further includes a pressure drive assembly, and the pressure drive assembly includes:

[0013] A support frame connected to the inner wall of the valve cavity;

[0014] A rotating shaft, the rotating shaft is rotatably connected to the supporting frame;

[0015] An impeller connected to an end of the rotating shaft away from the pressure regulating member;

[0016] A driving sleeve, one end of which is slidably connected to the rotating shaft, a guide groove is provided along the length direction of the rotating shaft, and the other end of the driving sleeve abuts against the pressure regulating member;

[0017] The limiting frame is connected to the supporting frame, and the end of the limiting frame is slidably connected to the guide groove.

[0018] Preferably, the pressure drive assembly further comprises:

[0019] The airbag is connected to the rotating shaft and arranged in the thread groove at the end of the driving sleeve. The side wall of the thread groove is provided with threads. The volume of the airbag changes with the pressure in the valve cavity.

[0020] A first clamping plate, the first clamping plate is connected to the rotating shaft and arranged at the bottom of the thread groove, and the first clamping plate is connected to one side of the airbag;

[0021] A second clamping plate, the second clamping plate is connected to the other side of the airbag;

[0022] The threaded sleeve is threadedly connected to the side wall of the threaded groove. One end of the threaded sleeve is rotatably connected to the first clamping plate, and the other end extends out of the threaded groove. A gap is provided between the threaded sleeve and the second clamping plate.

[0023] Preferably, the drive assembly further comprises:

[0024] The spiral blade is connected to the extended end of the threaded sleeve, and the spiral direction of the spiral blade is opposite to the spiral direction of the impeller.

[0025] Preferably, under the condition of the same liquid flow rate in the valve chamber, the torque generated by the rotation of the impeller is greater than the torque generated by the rotation of the spiral blade.

[0026] Preferably, an annular groove is provided on the outer side of the pressure regulating member, and a balancing component is provided in the annular groove, and the balancing component includes:

[0027] A support, the support is arranged in the annular groove and connected to the inner wall of the valve cavity, and the support is concentrically arranged between the pressure regulating member and the valve body;

[0028] The second spring is connected between the support and the side wall of the annular groove, and the second spring is arranged close to the support frame.

[0029] Preferably, the balancing component further comprises:

[0030] Ring parts, two ring parts are symmetrically arranged on the inner wall of the support with a gap between them, and the support is provided with an arc groove corresponding to the ring parts; the ring parts are evenly provided with a plurality of grooves along the circumferential direction, and the inner side of the ring parts is slidably connected with the pressure regulating part;

[0031] The stabilizing block is arranged in the groove and abuts between the two annular members and the support.

[0032] Preferably, the balancing component further comprises:

[0033] The elastic part includes a main section and a curved section. The two curved sections are connected to the two ends of the main section. The center of the main section bends outwards, and the center of the curved section bends toward the left and right sides of the main section. The center of the main section abuts against the stabilizing block, and the two curved sections abut against two annular parts respectively.

[0034] Compared with the prior art, the present invention has at least the following beneficial effects:

[0035] The present invention provides a high-pressure, erosion-resistant, one-way valve, which adopts a first spring connected to the valve core, effectively realizing the one-way conduction function of the one-way valve and improving the resetting ability of the valve core; a pressure regulating component is arranged in the valve cavity, and the position of the pressure regulating component is automatically adjusted according to the pressure in the valve cavity, thereby changing the elastic force of the first spring acting on the valve core, and then adjusting the gap between the valve core and the pressure regulating component, thereby realizing the regulation and compensation of the pressure when the fluid flows out of the valve cavity, improving the pressure stabilizing effect of the one-way valve, and being effectively applicable to the high-pressure environment during oil extraction.

[0036] The high-pressure erosion-resistant check valve described in the present invention, other advantages, objectives and features of the present invention will be reflected in part through the following description, and in part will be understood by technicians in this field through research and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0038] Figure 1It is a schematic cross-sectional structure diagram of a high-pressure erosion-resistant check valve of the present invention;

[0039] Figure 2 It is a schematic diagram of the partial cross-sectional structure of the check valve at the pressure regulating member in the present invention;

[0040] Figure 3 For the present invention Figure 2 The local enlarged structure diagram at A in the middle;

[0041] Figure 4 Schematic diagram of the cross-sectional structure of the pressure regulating member in the present invention (equilibrium state);

[0042] Figure 5 Schematic diagram of the cross-sectional structure of the pressure regulating member in the present invention (slightly deflected state);

[0043] Figure 6 For the present invention Figure 4 The local enlarged structure diagram at B in the middle;

[0044] Figure 7 It is a schematic diagram of the structure of the stabilizing block and the elastic member in the present invention.

[0045] In the figure: 1. valve body; 2. valve cavity; 3. valve core; 4. first spring; 5. pressure regulating member; 6. fluid channel; 11. flange; 12. through hole; 13. tapered end; 21. support frame; 22. rotating shaft; 23. impeller; 24. driving sleeve; 25. limiting frame; 26. guide groove; 27. air bag; 28. first clamping plate; 29. ​​second clamping plate; 31. threaded sleeve; 32. threaded groove; 33. spiral blade; 41. annular groove; 42. support; 43. second spring; 44. annular member; 45. arc groove; 46. groove; 47. stabilizing block; 48. elastic member; 49. main section; 50. bending section. DETAILED DESCRIPTION

[0046] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments so that those skilled in the art can implement the invention with reference to the description.

[0047] It should be understood that the terms such as “having”, “including” and “comprising” used herein do not exclude the existence or addition of one or more other elements or combinations thereof.

[0048] Embodiment 1:

[0049] like Figure 1 As shown, the present invention provides a high-pressure erosion-resistant check valve, comprising:

[0050] A valve body 1, a valve cavity 2 is arranged at the center of the valve body 1, a valve core 3 is slidably connected to one side of the valve cavity 2, and a first spring 4 is connected between the valve core 3 and the inner wall of the valve cavity 2;

[0051] The pressure regulating member 5 is slidably connected to the other side of the valve cavity 2 , a fluid channel 6 is provided at the center of the pressure regulating member 5 , and the end of the valve core 3 is sealed and connected to one end of the fluid channel 6 .

[0052] The working principle and beneficial effects of the above technical solution are:

[0053] The present invention provides a high-pressure erosion-resistant one-flow valve, wherein a fluid inlet and a fluid outlet are respectively arranged at both ends of a valve body 1, and a valve cavity 2 is arranged in the center, and the fluid can pass through the fluid inlet, the valve cavity 2 and the fluid outlet in sequence; a valve core 3 is slidably arranged in the valve cavity 2, and when the one-flow valve is not working or the fluid is reversely introduced, the valve core 3 abuts against the pressure regulating component 5 under the action of a first spring 6, and blocks one end of the pressure regulating component 5, so that the fluid cannot pass through; when the one-flow valve is used normally, under the action of the fluid pressure, the valve core 3 is separated from the pressure regulating component 5, and the fluid passes through the gap between the valve core 3 and the pressure regulating component 5 and flows to the other end of the valve body 1. A pressure regulating member 5 is arranged in the valve body 1. By adjusting the position of the pressure regulating member 5 in the valve cavity 2, the position of the end of the valve core 3 is adjusted, and then the length of the first spring 6 is adjusted, so that the pre-pressure acting on the valve core 3 is different; when the fluid pressure increases, the pressure regulating member 5 moves in the positive direction, so that the length of the first spring 6 is reduced, the elastic force acting on the valve core 3 is increased, the pressure required to open the valve core 3 is increased, the gap between the valve core 3 and the pressure regulating member 5 is reduced, and then the pressure when the fluid flows out of the valve cavity 2 is reduced; on the contrary, when the fluid pressure decreases, the pressure regulating member 5 moves in the reverse direction, so that the length of the first spring 6 is increased, the elastic force acting on the valve core 3 is reduced, the pressure required to open the valve core 3 is reduced, the gap between the valve core 3 and the pressure regulating member 5 is increased, and then the pressure when the fluid flows out of the valve cavity 2 is increased.

[0054] Through the above-mentioned structural design, the first spring 4 is connected to the valve core 3, so as to effectively realize the one-way conduction function of the check valve and improve the resetting ability of the valve core 3; a pressure regulating member 5 is arranged in the valve cavity 2, and the position of the pressure regulating member 5 is automatically adjusted according to the pressure in the valve cavity 2, so as to change the elastic force of the first spring 6 acting on the valve core 3, and then adjust the gap between the valve core 3 and the pressure regulating member 5, so as to realize the regulation and compensation of the pressure when the fluid flows out of the valve cavity 2, improve the pressure stabilizing effect of the check valve, and effectively apply to the high-pressure environment during oil extraction.

[0055] Embodiment 2:

[0056] like Figure 1 , 2 As shown, on the basis of the above-mentioned embodiment 1, the valve core 3 includes: a flange 11, a through hole 12 and a tapered end 13, the flange 11 is concentrically connected to the valve core 3, and the first spring 4 is connected between the flange 11 and the inner wall of the valve cavity 2; a plurality of through holes 12 are provided on the valve core 3 and are evenly arranged along the circumferential direction; the tapered end 13 is connected to one end of the valve core 3 close to the pressure regulating member 5, and a tapered mouth adapted to the tapered end 13 is provided at the end of the fluid channel 6.

[0057] The working principle and beneficial effects of the above technical solution are:

[0058] A flange 11 is provided on the valve core 3, and the flange 11 is slidably connected to the inside of the valve cavity 2 to guide the valve core 3; and the flange 11 can abut the first spring 4 between it and the inner wall of the valve cavity 2; the conical end 13 on the valve core 3 abuts on the pressure regulating member 5 under the action of the first spring 4 to seal the conical mouth of the pressure regulating member 5; a through hole 12 is provided in the circumferential direction of the valve core 3, and when the conical end 13 is separated from the pressure regulating member 5, the fluid passes through the gap between the valve core 3 and the pressure regulating member 5, enters the valve cavity 2, and enters the inside of the valve core 3 through the through hole 12, and flows through the other end of the valve core 3 to the fluid outlet of the valve body 1.

[0059] Embodiment 3:

[0060] On the basis of the above-mentioned embodiment 2, the surfaces of the tapered end 13 and the pressure regulating member 5 are both provided with a hard alloy layer.

[0061] The working principle and beneficial effects of the above technical solution are:

[0062] The surfaces of the conical end 13 and the pressure regulating member 5 are both provided with a hard alloy layer, and the hard alloy layer is made of any one of a cobalt-based alloy, a nickel-based alloy, and a tungsten carbide-based alloy. The provision of the hard alloy layer makes it difficult for the conical end 13 and the pressure regulating member 5 to be damaged when subjected to fluid erosion for a long time, thereby improving the erosion resistance of the check valve.

[0063] Embodiment 4:

[0064] like Figure 1-Figure 3 As shown, based on the above embodiment 1, the high-pressure erosion-resistant check valve further includes a pressure drive component, and the pressure drive component includes:

[0065] A support frame 21, the support frame 21 is connected to the inner wall of the valve chamber 2;

[0066] A rotating shaft 22, the rotating shaft 22 is rotatably connected to the supporting frame 21;

[0067] An impeller 23, the impeller 23 is connected to an end of the rotating shaft 22 away from the pressure regulating member 5;

[0068] A driving sleeve 24, one end of which is slidably connected to the rotating shaft 22, a guide groove 26 is provided on the driving sleeve 24 along the length direction of the rotating shaft 22, and the other end of the driving sleeve 24 abuts against the pressure regulating member 5;

[0069] The limiting frame 25 is connected to the supporting frame 21 , and the end of the limiting frame 25 is slidably connected to the guide groove 26 .

[0070] The working principle and beneficial effects of the above technical solution are:

[0071] When the pressure drive assembly is used, the impeller 23 and the rotating shaft 22 are driven to rotate in the forward direction under the action of the fluid pressure, and the rotating shaft 22 drives the driving sleeve 24 to move through the threaded transmission; under the guidance of the limit frame 25, the driving sleeve 24 moves along the axial direction of the rotating shaft 22; the driving sleeve 24 abuts against the pressure regulating member 5, and when the driving sleeve 24 moves away from the impeller 23, the driving sleeve 24 pushes the pressure regulating member 5 to squeeze the valve core 3, so that the compressed length of the first spring 4 is reduced; when the driving sleeve 24 moves toward the impeller 23, the pressure regulating member 5 moves in the opposite direction to reset, the released length of the first spring 4 is increased, and the valve core 4 is squeezed on the pressure regulating member 5. Through the above structural design, the driving sleeve 24 is driven by the fluid pressure, so that it can adjust the position of the pressure regulating member 5 to adapt to the size of the fluid pressure, without the need for an additional power source, to achieve the pressure stabilization control of the check valve, and improve the use effect of the check valve.

[0072] Embodiment 5:

[0073] like Figure 1-Figure 3 As shown, based on the above-mentioned embodiment 4, the pressure drive component further includes:

[0074] The airbag 27 is connected to the rotating shaft 22 and is disposed in the thread groove 32 at the end of the driving sleeve 24. The side wall of the thread groove 32 is provided with threads. The volume of the airbag 27 changes with the pressure in the valve cavity 2.

[0075] A first clamping plate 28, the first clamping plate 28 is connected to the rotating shaft 22 and arranged at the bottom of the thread groove 32, and the first clamping plate 28 is connected to one side of the airbag 27;

[0076] A second clamping plate 29, the second clamping plate 29 is connected to the other side of the airbag 27;

[0077] A threaded sleeve 31, the threaded sleeve 31 is threadedly connected to the side wall of the thread groove 32, one end of the threaded sleeve 31 is rotatably connected to the first clamping plate 28, and the other end extends out of the thread groove 32, and a gap is provided between the threaded sleeve 31 and the second clamping plate 29;

[0078] The spiral blade 33 is connected to the extended end of the threaded sleeve 31 , and the spiral direction of the spiral blade 33 is opposite to the spiral direction of the impeller 23 .

[0079] In the case of the same liquid flow rate in the valve chamber 2 , the torque generated by the rotation of the impeller 23 is greater than the torque generated by the rotation of the spiral blade 33 .

[0080] The working principle and beneficial effects of the above technical solution are:

[0081] When the pressure drive assembly is in use, the impeller 23 and the rotating shaft 22 are driven to rotate under the action of fluid pressure, and the airbag 27 is arranged on the rotating shaft 22. As the fluid pressure in the valve chamber 2 increases, the volume of the airbag 27 is compressed, so that the second clamping plate 29 is close to the first clamping plate 28; when the fluid pressure reaches a preset value, the second clamping plate 29 contacts and clamps the threaded sleeve 31, thereby connecting the rotating shaft 22 and the threaded sleeve 31; therefore, as the rotating shaft 22 rotates, the threaded sleeve 31 is driven to rotate synchronously, and the threaded sleeve 31 and the threaded groove 32 at the end of the driving sleeve 24 are spirally driven, driving the driving sleeve 24 to move away from the impeller 23, so that the driving sleeve 24 squeezes the pressure regulating member 5, and the compressed length of the first spring 4 is reduced, thereby achieving the purpose of pressure regulation. As the fluid pressure in the valve chamber 2 decreases, the volume of the airbag 27 increases under the action of its own elasticity, so that the second clamping plate 29 is separated from the threaded sleeve 31, and the threaded sleeve 31 does not rotate with the impeller 23 and the rotating shaft 33; the spiral blade 33 rotates under the action of the fluid pressure, and the rotation direction is opposite to the spiral direction of the impeller 23, so the spiral blade 33 drives the threaded sleeve 31 to rotate in the opposite direction, so that the driving sleeve 24 moves toward the impeller 23, and the pressure regulating member 5 moves accordingly, so that the compressed length of the first spring 4 increases, thereby achieving the purpose of pressure regulation.

[0082] Under the condition of the same liquid flow rate in the valve chamber 2, the torque generated by the rotation of the impeller 23 is greater than the torque generated by the rotation of the spiral blade 33; when the pressure is high, the impeller 23 can overcome the reverse force of the spiral blade 33 and drive the threaded sleeve 31 to rotate.

[0083] Through the above-mentioned structural design, an air bag 27 that changes with the pressure of the valve chamber 2 and two clamping plates connected thereto are used to achieve switching of the clutch state of the rotating shaft 22 and the threaded sleeve 31 under different fluid pressure states. When the fluid pressure exceeds a preset value, the rotating shaft 22 and the threaded sleeve 31 rotate synchronously, so that the driving sleeve 24 drives the pressure regulating part 5 to move forward; when the fluid pressure is lower than the preset value, the rotating shaft 22 is separated from the threaded sleeve 31, so that the driving sleeve 24 drives the pressure regulating part 5 to move in the reverse direction; that is, the automatic driving of the pressure regulating part 5 is achieved when the pressure changes, thereby improving the accuracy of fluid pressure regulation.

[0084] Embodiment 6:

[0085] like Figure 4-Figure 7 As shown, on the basis of the above-mentioned embodiment 5, an annular groove 41 is arranged on the outer side of the pressure regulating member 5, and a balancing component is arranged in the annular groove 41, and the balancing component includes:

[0086] A support 42, the support 42 is arranged in the annular groove 41 and connected to the inner wall of the valve cavity 2, and the support 42 is concentrically arranged between the pressure regulating member 5 and the valve body 1;

[0087] The second spring 43 is connected between the support 42 and the side wall of the annular groove 41 . The second spring 43 is arranged close to the support frame 21 .

[0088] The working principle and beneficial effects of the above technical solution are:

[0089] The support 42 is relatively fixed to the valve chamber 2, and a second spring 43 is arranged between the support 42 and the pressure regulating member 5. When the support 42 is subjected to fluid pressure, the position of the pressure regulating member 5 can be kept stable under the action of the elastic force of the second spring 43, and when the fluid pressure is higher than a preset value, it can be compressed under the joint action of the drive sleeve 24 and the fluid pressure to adapt to the position change of the pressure regulating member 5 and improve the smoothness of the movement process of the pressure regulating member 5; when the fluid pressure is lower than the preset value, the elastic force of the second spring 43 helps the pressure regulating member 5 to quickly reset.

[0090] Embodiment 7:

[0091] like Figure 4-Figure 7 As shown, based on the above embodiment 6, the balancing component further includes:

[0092] Ring members 44, two ring members 44 are symmetrically arranged on the inner wall of the support 42 with a gap between them, and an arc groove 45 corresponding to the ring members 44 is arranged on the support 42; a plurality of grooves 46 are evenly arranged on the outer side of the ring members 44 along the circumferential direction, and the inner side of the ring members 44 is slidably connected with the pressure regulating member 5;

[0093] The stabilizing block 47 is disposed in the groove 46 and abuts between the two annular members 44 and the support 42 .

[0094] The working principle and beneficial effects of the above technical solution are:

[0095] When assembling the balancing assembly, the two annular members 44 are installed in the arc groove 45 of the support 42, and the pressure regulating member 5 is passed through the inner side of the annular member 44. The two annular members 44 are symmetrically arranged in the arc groove 45, which can decompose the pressure on both sides of the pressure regulating member 5, and the pressure on both sides is respectively transmitted to the annular members 44 on both sides. The stabilizing block 47 is abutted between the annular member 44 and the support 42, which can keep the two annular members 44 stably installed and prevent them from rotating at will when the balancing assembly is used.

[0096] Embodiment 8:

[0097] like Figure 4-Figure 7 As shown, based on the above embodiment 1, the balancing component further includes:

[0098] The elastic member 48 includes a main section 49 and a bending section 50. The two bending sections 50 are connected to the two ends of the main section 49. The center of the main section 49 bends outward, and the center of the bending section 50 bends to the left and right sides of the main section 49. The center of the main section 49 abuts against the stabilizing block 47, and the two bending sections 50 abut against the two annular members 44 respectively.

[0099] The working principle and beneficial effects of the above technical solution are:

[0100] The elastic member 48 includes a main section 49 and a curved section 50. Under the elastic force of the main section 49, the two annular members 44 remain fixed when no force is applied or when the forces on both sides are uniform. At this time, the rotation axis of the two annular members 44 coincides with the rotation axis of the pressure regulating member 5, and the pressure on both sides of the pressure regulating member 5 is in a balanced state; the two curved sections 50 are respectively in contact with the grooves 46 of the two annular members 44. On the one hand, when the forces on both sides of the pressure regulating member 5 are uneven and vibrate, the two curved sections 50 can respectively reduce the vibration of the two sides of the pressure regulating member 5; on the other hand, when the forces on both sides of the pressure regulating member 5 are uneven and different degrees of slight deflection occur, the two curved sections 50 can produce deformations of different amplitudes accordingly, balance the deflection of the pressure regulating member 5, and prevent the slight offset on one side of the pressure regulating member 5 from causing movement jamming, thereby improving the flexibility of the pressure regulating member 5 and making the pressure regulation process of the check valve more reliable.

[0101] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0102] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0103] Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and the implementation methods. They can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and the illustrations shown and described herein.

Claims

1. A high-pressure erosion-resistant check valve, characterized in that: include: A valve body (1), wherein a valve cavity (2) is arranged at the center of the valve body (1), a valve core (3) is slidably connected to one side of the valve cavity (2), and a first spring (4) is connected between the valve core (3) and the inner wall of the valve cavity (2); A pressure regulating member (5) is slidably connected to the other side of the valve cavity (2), a fluid channel (6) is provided at the center of the pressure regulating member (5), and an end of the valve core (3) is sealed and connected to one end of the fluid channel (6).

2. A high pressure erosion resistant check valve according to claim 1, characterized in that: The valve core (3) comprises: a flange (11), a through hole (12) and a tapered end head (13); the flange (11) is concentrically connected to the valve core (3); a first spring (4) is connected between the flange (11) and the inner wall of the valve cavity (2); a plurality of through holes (12) are provided on the valve core (3) and are evenly arranged along the circumferential direction; the tapered end head (13) is connected to one end of the valve core (3) close to the pressure regulating member (5); and a tapered opening adapted to the tapered end head (13) is provided at the end of the fluid passage (6).

3. A high pressure erosion resistant check valve according to claim 2, characterized in that: The surfaces of the conical end (13) and the pressure regulating member (5) are both provided with a hard alloy layer.

4. A high pressure erosion resistant check valve according to claim 1, characterized in that: Also included is a pressure drive assembly, which includes: A support frame (21), the support frame (21) is connected to the inner wall of the valve chamber (2); A rotating shaft (22), the rotating shaft (22) is rotatably connected to the supporting frame (21); An impeller (23), the impeller (23) being connected to an end of the rotating shaft (22) away from the pressure regulating member (5); A driving sleeve (24), one end of which is slidably connected to the rotating shaft (22), the driving sleeve (24) is provided with a guide groove (26) along the length direction of the rotating shaft (22), and the other end of the driving sleeve (24) is in contact with the pressure regulating member (5); The limiting frame (25) is connected to the supporting frame (21), and the end of the limiting frame (25) is slidably connected to the guide groove (26).

5. A high pressure erosion resistant check valve according to claim 4, characterized in that: The pressure drive assembly also includes: An airbag (27), the airbag (27) is connected to the rotating shaft (22) and is arranged in a thread groove (32) at the end of the driving sleeve (24), the side wall of the thread groove (32) is provided with threads, and the volume of the airbag (27) changes with the pressure in the valve cavity (2); A first clamping plate (28), the first clamping plate (28) is connected to the rotating shaft (22) and arranged at the bottom of the thread groove (32), and the first clamping plate (28) is connected to one side of the airbag (27); A second clamping plate (29), the second clamping plate (29) is connected to the other side of the airbag (27); The threaded sleeve (31) is threadedly connected to the side wall of the threaded groove (32), one end of the threaded sleeve (31) is rotatably connected to the first clamping plate (28), and the other end extends out of the threaded groove (32), and a gap is provided between the threaded sleeve (31) and the second clamping plate (29).

6. A high pressure erosion resistant check valve according to claim 5, characterized in that: The pressure drive assembly also includes: A spiral blade (33) is connected to the extended end of the threaded sleeve (31), and the spiral direction of the spiral blade (33) is opposite to the spiral direction of the impeller (23).

7. A high pressure erosion resistant check valve according to claim 6, characterized in that: Under the condition of the same liquid flow rate in the valve chamber (2), the torque generated by the rotation of the impeller (23) is greater than the torque generated by the rotation of the spiral blade (33).

8. The high-pressure erosion-resistant check valve according to claim 4, characterized in that: An annular groove (41) is arranged on the outer side of the pressure regulating member (5), and a balancing component is arranged in the annular groove (41), wherein the balancing component comprises: A support (42), the support (42) is arranged in the annular groove (41) and connected to the inner wall of the valve cavity (2), and the support (42) is concentrically arranged between the pressure regulating member (5) and the valve body (1); A second spring (43), the second spring (43) is connected between the support (42) and the side wall of the annular groove (41), and the second spring (43) is arranged close to the support frame (21).

9. A high-pressure erosion-resistant check valve according to claim 8, characterized in that: The balancing components also include: Ring members (44), two ring members (44) are symmetrically arranged on the inner wall of the support (42) with a gap therebetween, and the support (42) is provided with an arc groove (45) corresponding to the ring members (44); a plurality of grooves (46) are evenly arranged on the outer side of the ring members (44) along the circumferential direction, and the inner side of the ring members (44) is slidably connected to the pressure regulating member (5); A stabilizing block (47) is disposed in the groove (46) and abuts between the two annular members (44) and the support (42).

10. The high-pressure erosion-resistant check valve according to claim 9, characterized in that: The balancing components also include: The elastic member (48) comprises a main section (49) and a curved section (50). The two curved sections (50) are connected to two ends of the main section (49). The center of the main section (49) is bent outwards, and the center of the curved section (50) is bent toward the left and right sides of the main section (49). The center of the main section (49) is in contact with the stabilizing block (47), and the two curved sections (50) are in contact with the two annular members (44) respectively.

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