Integrated high-pressure stop valve

Abstract

The invention discloses an integrated high-pressure stop valve, and particularly relates to the technical field of stop valves, the integrated high-pressure stop valve comprises a valve body and a valve rod, the valve body comprises a first valve body and a second valve body which are integrally formed, and the first valve body and the second valve body are coaxially arranged and fixedly connected with the same connecting piece; a main flow channel, an inlet flow channel and an outlet flow channel which are communicated are formed in the first valve body, the valve rod coaxially slides in the valve body, a valve clack is coaxially arranged at the end, located in the main flow channel, of the valve rod, and a valve seat matched with the valve clack is coaxially arranged at the communication position of the inlet flow channel and the main flow channel. According to the stop valve, the compression cavity, the valve clack, the outlet flow channel, the main flow channel and the like are arranged, the valve seat and the compression cavity form the first valve port, the outlet flow channel and the compression cavity form the second valve port, and when a fluid medium flows in the stop valve, under the arrangement of the double valve ports, the pressure caused to the valve seat when the fluid passes through the valve seat is reduced, and erosion of the fluid medium to the valve seat is weakened.

Description

Technical Field

[0001] The present invention belongs to the technical field of stop valves, and more specifically, relates to an integrated high-pressure stop valve. Background Art

[0002] The Y-shaped high-pressure stop valve is also called a diagonal flow or direct flow high-pressure stop valve because its flow channel is shaped like the letter "Y". This design reduces the pressure loss when the fluid passes through the valve and reduces the degree of damage to the flow state.

[0003] When using a stop valve, an excessively high flow rate will produce a strong scouring effect on the valve seat area. Especially when the valve is opened, the fluid passing through a narrow space at high speed will cause impact and wear on the valve seat.

[0004] The Chinese patent with application number 201811259186.7 discloses a Y-type stop valve, including a valve body, a valve seat ring, a valve core rod, an inverted sealing ring, an anti-rotation guide sleeve, a combined packing, a clamping part, a movable rod, a bracket, and a driving part. The valve seat ring is fixedly connected to the valve body, and the inverted sealing ring is pressed in the valve body through the anti-rotation guide sleeve. The valve body and the valve core rod are both integrated structures, and the valve core and the valve stem are combined into a whole. When the stop valve is closed, the sealing surface of the valve core rod and the sealing surface of the valve seat ring cooperate to form a sealing pair. When the stop valve is fully opened, the upper sealing surface of the valve core rod forms a seal with the inverted sealing ring, the clamp is spherically hingedly connected to the movable rod, and the upper end of the movable rod forms a kinematic pair with the driving part. Through the above structural design, the structure of the Y-type stop valve is simplified, and the technical problems of easy erosion and wear of the sealing surface of the high-temperature and high-pressure Y-type stop valve and easy internal and external leakage of the valve are solved, thereby improving the service life of the valve.

[0005] A Chinese patent with application number 202010171228.2 discloses a Y-type stop valve with a detachable movable valve seat, comprising a valve body, an integrated valve core rod, a bracket and a handwheel; the valve body has a three-channel structure of a medium inlet flow channel and a medium outlet flow channel in the valve body middle cavity; in the valve body middle cavity of the valve body, a valve seat sealing gasket, a valve seat, a sleeve and a sleeve gland are installed in sequence from bottom to top; a sleeve is installed on the upper surface of the valve seat base ring; the integrated valve core rod is inserted into the valve body through the sleeve; a sleeve gland is installed above the sleeve; the outer circle of the lower end of the valve core rod cooperates with the inner wall of the sleeve to form a guide, and the upper end passes through the stuffing box hole provided on the sleeve gland, and the stuffing box hole is successively equipped with a packing liner, a combined packing and a packing gland; the bracket is installed on the upper part of the valve body, and the lower end of the bracket adopts a clamp design, which is fixed to the valve body by a threaded connection and fastened with a bracket locking screw.

[0006] However, in actual use, when the stop valve is in the on state, the medium passes through the valve seat and erodes the sealing surface of the valve seat. In addition, on the side close to the outlet flow channel, the medium has a high flow rate and a large flow rate, which makes the valve seat wear more frequently. In long-term use, uneven wear is prone to occur, resulting in sealing failure and leakage. If the valve seat is replaced regularly, it is not only time-consuming and labor-intensive, but also has a high cost, and the valve seat is not effectively utilized.

[0007] At the same time, when workers operate the stop valve to close it, the contact surface between the valve disc and the valve seat may be mixed with impurities in the liquid, such as rust, mud and other hard particles. These impurities will scratch the sealing surface. With long-term use, the sealing surface between the valve disc and the valve seat will inevitably leak.

[0008] Therefore, the present invention proposes an integrated high-pressure stop valve to solve the above problems. Summary of the invention

[0009] In order to overcome the above defects of the prior art, an embodiment of the present invention provides an integrated high-pressure stop valve, which solves the problems raised in the above background technology by providing a double valve port, a pressure rotation mechanism, a rotating part and a connecting part.

[0010] To achieve the above-mentioned object, the present invention provides the following technical solutions: an integrated high-pressure stop valve, comprising a valve body and a valve stem, the valve body comprising an integrally formed first valve body and a second valve body, the first valve body and the second valve body are coaxially arranged and fixedly connected with a same connecting piece, a main flow channel, an inlet flow channel and an outlet flow channel connected to each other are provided in the first valve body, the valve stem coaxially slides in the valve body, a valve disc is coaxially arranged at one end of the valve stem located in the main flow channel, a valve seat matching the valve disc is coaxially arranged at the connecting point between the inlet flow channel and the main flow channel, and the contact surface between the valve disc and the valve seat is conical; The angle between the axis of the outlet flow channel and the main flow channel is an acute angle, and the lowest point of the outlet flow channel is higher than the valve seat. When the valve flap and the valve seat are in a sealed state, the valve flap and the main flow channel form a compression chamber; A pressure rotating mechanism is arranged in the valve seat.

[0011] Preferably, a spline bushing is coaxially arranged in the first valve body, a spline matching the spline bushing is arranged on the valve stem, a yoke bushing is threadedly connected to the second valve body, a yoke nut is coaxially arranged in the yoke bushing, one end of the valve stem away from the valve disc is threadedly connected to the yoke nut, and a handwheel is coaxially fixed on the circumferential side of the yoke nut.

[0012] Preferably, the valve flap includes a cylindrical connecting seat, the circumferential side of the connecting seat is in contact with the side wall of the main channel, a notch groove is coaxially opened on the connecting seat, the end of the valve stem close to the valve flap is inserted into the inside of the notch groove, a sealing block is coaxially fixed to the end of the connecting seat away from the valve stem, and a conical sealing surface is provided on the circumferential side of the sealing block.

[0013] Preferably, a sealing platform located between the valve disc and the spline is coaxially fixed on the valve stem, a back seat is coaxially fixed on one end of the spline bushing close to the sealing platform, and the contact surface between the sealing platform and the back seat is a conical surface.

[0014] Preferably, the valve seat comprises a base and a rotating seat, the pressure rotating mechanism comprises an annular groove coaxially opened on the upper surface of the base, an annular plate is coaxially arranged on the rotating seat, the annular plate is sealingly and slidingly connected with the annular groove, an elastic member is arranged between the annular groove and the annular plate, an annular rotating portion is opened on the side wall of the annular groove, and a connecting portion matching the rotating portion is arranged on the side wall of the annular plate; When the valve flap and the valve seat gradually form a seal, the pressure in the compression chamber gradually increases, the rotating seat drives the annular plate to move downward, and the rotating seat rotates under the limit of the connecting part and the rotating part.

[0015] Preferably, the rotating part comprises a plurality of inclined descending grooves and ascending grooves, the plurality of descending grooves and ascending grooves are alternately arranged one by one and connected end to end, the plurality of ascending grooves and descending grooves form an annular wave-like structure, and the peak and valley sections and the peak sections are both provided with guide grooves, the guide grooves comprise staggered sections and horn sections connected to the ascending grooves or descending grooves; The connecting part comprises a connecting rod, and one end of the connecting rod away from the annular plate is slidably disposed in the descending groove, the guiding groove or the ascending groove; After the connecting rod enters the guiding groove from the ascending groove, the connecting rod moves toward the descending groove under the guidance of the guiding groove, so that the connecting rod can enter the descending groove when moving downward.

[0016] Preferably, the rotating seat includes a pressure plate, a sealing plate and a sliding plate, the pressure plate is arranged parallel to the upper surface of the base, and the annular plate is fixedly connected to the lower surface of the pressure plate, the sealing plate is inclined and matches the sealing surface of the valve disc, the base is provided with an inclined surface matching the sealing plate, and the base is provided with an annular groove matching the sliding plate.

[0017] Preferably, when the connecting seat moves toward the side close to the valve seat, the distance that the lower surface of the connecting seat exceeds the lowest point of the outlet flow channel is the downward pressure gap D, the downward pressure distance of the rotating seat is the active gap d, and the downward pressure gap D is greater than the active gap d.

[0018] Preferably, a liquid inlet cavity is formed between the rotating seat and the base, and a plurality of through holes distributed at equal intervals are formed through the sealing plate.

[0019] Preferably, a packing ring located above the spline bushing is arranged in the main flow channel, and a sealing bushing in contact with the packing ring is coaxially arranged at the end of the main flow channel; It also includes a packing flange located between the first valve body and the second valve body. The packing flange is connected to the first valve body via bolts, and a side of the sealing bushing away from the packing ring is coaxially sleeved inside the packing flange.

[0020] Technical effects and advantages of the present invention: The present invention is provided with a compression chamber, a valve disc, an outlet flow channel and a main flow channel, wherein the valve seat and the compression chamber form a first valve port, and the outlet flow channel and the compression chamber form a second valve port. When the fluid medium flows in the stop valve, under the setting of the "double valve port", the pressure on the valve seat caused by the fluid passing through the valve seat is reduced, and the erosion of the valve seat by the fluid medium is weakened; at the same time, because the circumferential side of the connecting seat is always in contact with the side wall of the main flow channel, when the fluid medium enters the compression chamber, most of the medium will not enter the side and back of the valve disc due to the obstruction of the connecting seat, thereby avoiding the leakage problem caused by the eccentricity of the valve stem or the valve disc due to the action of the medium flow during the switching process of the stop valve.

[0021] The present invention is provided with rising grooves, descending grooves and guide grooves, etc., so that whenever the staff opens or closes the stop valve, the rotating seat will rotate in the same direction during the rising and descending processes, thereby avoiding the problem of uneven wear of the sealing surface of the valve seat, extending the service life of the valve seat, and improving the utilization rate of the valve seat; at the same time, even if the sealing surface of the valve seat leaks, the staff can directly replace the rotating seat and install the new rotating seat on the base, thereby reducing the repair cost of the stop valve.

[0022] The present invention is provided with a sealing plate, a liquid inlet cavity and a plurality of through holes. When the rotating seat moves downward, the fluid medium in the liquid inlet cavity flows out from the through holes to flush the surface of the sealing plate, thereby preventing rust and hard particles from being caught in the sealing surfaces of the valve seat and the valve disc, thereby causing scratches and other problems, and further improving the service life of the valve seat. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0024] Figure 2 It is a schematic plan cross-sectional view of the present invention.

[0025] Figure 3 It is a schematic plan cross-sectional view of the stop valve of the present invention in a closed state.

[0026] Figure 4 for Figure 3 A schematic diagram of the enlarged structure at point A in the middle.

[0027] Figure 5 It is a schematic plan cross-sectional view of the stop valve of the present invention in a conducting state.

[0028] Figure 6 for Figure 5 A magnified schematic diagram of the structure at point B in the middle.

[0029] Figure 7 It is a partial cross-sectional view of the overall structure of the valve seat in the present invention.

[0030] Figure 8 It is a disassembly schematic diagram of the valve seat in the present invention.

[0031] Fig. 9 It is a schematic diagram of the plane expansion of the rotating part in the present invention.

[0032] Fig.10 It is a three-dimensional half-section view of the rotating seat and the annular plate in the present invention.

[0033] The accompanying drawings are marked as follows: 1. Valve body; 11. First valve body; 111. Main flow channel; 112. Inlet flow channel; 113. Outlet flow channel; 114. Spline bushing; 115. Back seat; 116. Packing ring; 117. Sealing bushing; 12. Second valve body; 121. Yoke bushing; 122. Yoke nut; 2. Valve stem; 21. Sealing platform; 3. Connectors; 4. Valve disc; 41. Connecting seat; 42. Sealing block; 5. valve seat; 51. base; 511. annular slide groove; 52. rotating seat; 521. pressure plate; 522. sealing plate; 5221. through hole; 523. sliding plate; 6. Compression chamber; 7. pressure rotation mechanism; 71. annular groove; 72. annular plate; 73. elastic member; 74. rotating part; 741. descending groove; 742. ascending groove; 743. guide groove; 7431. staggered section; 7432. horn section; 75. connecting rod; 8. Liquid inlet cavity; 9. Packing flange. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] Embodiment 1 In actual use, when the stop valve is in the conducting state, when the medium passes through the valve seat and enters the outlet flow channel, the sealing surface of the valve seat will be subjected to a greater impact, causing the medium to erode the valve seat to a greater extent. In severe cases, problems such as sealing surface leakage may occur. This embodiment is specially invented to solve the above problems.

[0036] See also Figures 1 to 4 As shown, an integrated high-pressure stop valve according to an embodiment of the present invention comprises a valve body 1 and a valve stem 2, the valve body 1 comprises an integrally formed first valve body 11 and a second valve body 12, the first valve body 11 and the second valve body 12 are coaxially arranged and fixedly connected with a same connecting piece 3, and the first valve body 11, the second valve body 12 and the connecting piece 3 are all integrally formed, a main flow channel 111, an inlet flow channel 112 and an outlet flow channel 113 which are connected are provided in the first valve body 11, the valve stem 2 slides coaxially in the valve body 1, a valve flap 4 is coaxially arranged at one end of the valve stem 2 located in the main flow channel 111, a valve seat 5 matching the valve flap 4 is coaxially arranged at the connecting point between the inlet flow channel 112 and the main flow channel 111, and the contact surface between the valve flap 4 and the valve seat 5 is conical.

[0037] See also Figure 2 As shown, the ends of the outlet flow channel 113 and the inlet flow channel 112 are both provided with connecting ports, the axes of the two connecting ports are consistent, the angle between the axes of the outlet flow channel 113 and the main flow channel 111 is an acute angle, the angle between the axes of the connecting port of the main flow channel 111 and the outlet flow channel 113 is 65 degrees, and the lowest point of the outlet flow channel 113 is higher than the valve seat 5. When the valve flap 4 and the valve seat 5 are in a sealed state, the valve flap 4 and the main flow channel 111 form a compression chamber 6. When the stop valve is in a conducting state, the compression chamber 6 reaches the maximum volume and is connected to the outlet flow channel 113. At this time, the valve seat 5 and the compression chamber 6 form a first valve port, and the outlet flow channel 113 and the compression chamber 6 form a second valve port.

[0038] See also Figure 2 As shown, a spline bushing 114 is coaxially arranged in the first valve body 11, and the spline bushing 114 is threadedly connected to the main channel 111. A spline matching the spline bushing 114 is arranged on the valve stem 2. A yoke bushing 121 is threadedly connected to the second valve body 12, and a yoke nut 122 is coaxially arranged in the yoke bushing 121. The end of the valve stem 2 away from the valve disc 4 is threadedly connected to the yoke nut 122, and a handwheel is coaxially fixed to the circumferential side of the yoke nut 122.

[0039] See also Figure 3 and Figure 4As shown, the valve flap 4 includes a cylindrical connecting seat 41, the circumferential side of the connecting seat 41 contacts the side wall of the main channel 111, a notch groove is coaxially opened on the connecting seat 41, the end of the valve stem 2 close to the valve flap 4 is inserted into the inside of the notch groove, a first annular groove is arranged at the head of the valve stem 2, a second annular groove matching the first annular groove is arranged on the side wall of the notch groove, the same steel wire is arranged in the first annular groove and the second annular groove, the valve stem 2 and the valve flap 4 are connected by the steel wire, a sealing block 42 is coaxially fixed to the end of the connecting seat 41 away from the valve stem 2, and a conical sealing surface is arranged on the circumferential side of the sealing block 42.

[0040] See also Figure 2 As shown, a sealing platform 21 located between the valve disc 4 and the spline is coaxially fixed on the valve stem 2, and a rear seat 115 is coaxially fixed on one end of the spline bushing 114 close to the sealing platform 21, and the contact surface between the sealing platform 21 and the rear seat 115 is a conical surface.

[0041] A packing ring 116 is disposed in the main channel 111 and is located above the spline bushing 114 . The packing ring 116 is a combined graphite ring packing. A sealing bushing 117 in contact with the packing ring 116 is coaxially disposed at the end of the main channel 111 .

[0042] It also includes a packing flange 9 located between the first valve body 11 and the second valve body 12 . The packing flange 9 is connected to the first valve body 11 by bolts, and a sealing bushing 117 is coaxially sleeved inside the packing flange 9 on a side away from the packing ring 116 .

[0043] When in use, the staff turns the hand wheel to move the valve stem 2 up and down in the valve body 1. During the movement, due to the action of the spline and the spline bushing 114, the valve stem 2 is not rotated and raised, but linearly raised and lowered, which not only avoids rotational friction between the valve stem 2 and the valve body 1, but also eliminates the torque on the sealing materials such as the packing ring 116. At the same time, in the process of forming a seal between the valve disc 4 and the valve seat 5, it also avoids the valve stem 2 driving the valve disc 4 to rotate and causing wear on the sealing surface of the valve seat 5.

[0044] When the stop valve is in the conducting state, the fluid medium enters the compression chamber 6 from the inlet flow channel 112, and then enters the outlet flow channel 113 through the compression chamber 6. However, it should be noted that even if a small amount of fluid medium enters the back side of the valve disc 4 through the gap between the connecting seat 41 and the main flow channel 111, the valve body 1 will not leak due to the sealing effect of the sealing platform 21, the rear seat 115 and the packing ring 116.

[0045] Through the arrangement of the compression chamber 6, the valve disc 4, the outlet flow channel 113 and the main flow channel 111, the valve seat 5 and the compression chamber 6 form a first valve port, and the outlet flow channel 113 and the compression chamber 6 form a second valve port. When the fluid medium flows in the stop valve, under the arrangement of the "double valve port", the pressure on the valve seat 5 caused by the fluid passing through the valve seat 5 is reduced, and the erosion of the valve seat 5 by the fluid medium is weakened; at the same time, because the circumferential side of the connecting seat 41 is always in contact with the side wall of the main flow channel 111, when the fluid medium enters the compression chamber 6, most of the medium will not enter the side and back of the valve disc 4 due to the obstruction of the connecting seat 41, thereby avoiding leakage caused by the eccentricity of the valve stem 2 or the valve disc 4 due to the flow of the medium during the switching process of the stop valve.

[0046] Embodiment 2 In actual use, it is found that the double valve port setting alone reduces the pressure on the valve seat 5 and reduces the erosion of the sealing surface of the valve seat 5. However, the side of the valve seat 5 close to the medium outlet flow channel 113 has a higher wear amount on the sealing surface due to the high flow rate and large flow rate. In long-term use, the sealing surface is prone to uneven wear, resulting in sealing failure and leakage. If the valve seat 5 is replaced regularly, it is not only time-consuming and labor-intensive, but also has high use costs, and the valve seat 5 is not effectively utilized. Further improvements are made on the basis of the above embodiments.

[0047] See also Figures 4 to 9 As shown, the valve seat 5 includes a base 51 and a rotating seat 52, and a pressure rotating mechanism 7 is arranged inside the valve seat 5. The pressure rotating mechanism 7 includes an annular groove 71 coaxially opened on the upper surface of the base 51, and an annular plate 72 is coaxially arranged on the rotating seat 52. The annular plate 72 is sealingly and slidingly connected to the annular groove 71, and an elastic member 73 is arranged between the annular groove 71 and the annular plate 72. A rotating portion 74 is opened on the side wall of the annular groove 71, and a connecting portion matching the rotating portion 74 is arranged on the side wall of the annular plate 72.

[0048] When the valve disc 4 and the valve seat 5 gradually form a seal, the pressure in the compression chamber 6 gradually increases, the rotating seat 52 drives the annular plate 72 to move downward, and the rotating seat 52 rotates a certain angle under the limit of the connecting part and the rotating part 74.

[0049] See also Fig. 9As shown, the rotating portion 74 includes a plurality of inclined descending grooves 741 and ascending grooves 742, the plurality of descending grooves 741 and ascending grooves 742 are alternately arranged one by one and connected end to end, the plurality of ascending grooves 742 and descending grooves 741 form an annular wave-like structure, and the peak and valley sections and the peak sections are both provided with guide grooves 743, the guide grooves 743 include a staggered section 7431 and a horn section 7432 connected to the ascending grooves 742 or the descending grooves 741, the staggered section 7431 is used to guide the connecting rod 75 to deviate in the direction of the descending grooves 741 or the ascending grooves 742, the horn section 7432 is to prevent the rotating seat 52 from rotating in the opposite direction due to the eddy current generated by the fluid medium during the ascending process, and the horn section 7432 can increase the fault tolerance of the connecting rod 75 during the movement process.

[0050] The connecting part includes a connecting rod 75, and one end of the connecting rod 75 away from the annular plate 72 is slidably set in the descending groove 741, the guide groove 743 or the ascending groove 742. The staggered section 7431 of the peak section causes the connecting rod 75 to shift in the direction of the descending groove 741. When the annular plate 72 moves downward, the connecting rod 75 enters the descending groove 741 under the guidance of the staggered section 7431 and the horn section 7432 and gradually enters the staggered section 7431 of the peak and valley section.

[0051] The reason for providing the staggered section 7431 and the trumpet section 7432 is to prevent the connecting rod 75 from moving in the ascending groove 742 and the descending groove 741 in the process of reverse movement; at the same time, it can also improve the smoothness of the connecting rod 75 sliding in the rotating part 74.

[0052] After the connecting rod 75 enters the guide groove 743 from the ascending groove 742, the connecting rod 75 moves toward the direction close to the descending groove 741 under the guidance of the guide groove 743, so that the connecting rod 75 can enter the descending groove 741 when moving downward.

[0053] See also Figure 7 and Fig.10 As shown, the rotating seat 52 includes a pressure plate 521, a sealing plate 522 and a sliding plate 523. The pressure plate 521 is arranged parallel to the upper surface of the base 51, and the annular plate 72 is fixedly connected to the lower surface of the pressure plate 521. The sealing plate 522 is inclined and matches the sealing surface of the valve disc 4. The base 51 is provided with an inclined surface matching the sealing plate 522, and the base 51 is provided with an annular groove 511 matching the sliding plate 523.

[0054] When the connecting seat 41 moves toward the side close to the valve seat 5, the distance that the lower surface of the connecting seat 41 exceeds the lowest point of the outlet flow channel 113 is the downward pressure gap D, the downward pressure distance of the rotating seat 52 is the movable gap d, and the downward pressure gap D is greater than the movable gap d.

[0055] During use, when the staff operates the handle to make the valve stem 2 drive the valve disc 4 to rise, the volume of the compression chamber 6 gradually increases, and the annular plate 72 and the rotating seat 52 move upward under the action of the elastic member 73. When the compression chamber 6 is connected with the outlet flow channel 113, the rotating seat 52 rises to the maximum position. It should be noted that during the rising process of the rotating seat 52 and the annular plate 72, the connecting rod 75 slides in the rising groove 742 and finally enters the guide groove 743. During this process, the rotating seat 52 will rotate a certain angle.

[0056] When the staff operates the handle to make the valve stem 2 drive the valve disc 4 to descend, the volume of the compression chamber 6 gradually decreases. As the outlet flow channel 113 and the compression chamber 6 are closed, the pressure in the compression chamber 6 increases rapidly. At this time, the pressure plate 521 moves downward under the action of pressure. During this process, the connecting rod 75 slides in the descending groove 741 and finally enters the guide groove 743. During this process, the rotating seat 52 will rotate a certain angle, and no matter whether the rotating seat 52 rises or falls, its rotation direction is always consistent.

[0057] Through the settings of the rising groove 742, the descending groove 741 and the guide groove 743, whenever the staff opens or closes the stop valve, the rotating seat 52 will rotate in the same direction during the rising and falling processes, thereby avoiding uneven wear of the sealing surface of the valve seat 5, extending the service life of the valve seat 5, and improving the utilization rate of the valve seat 5; at the same time, even if the sealing surface of the valve seat 5 leaks, the staff can directly replace the rotating seat 52 and install the new rotating seat 52 on the base 51, thereby reducing the repair cost of the stop valve.

[0058] Embodiment 3 When a worker operates the stop valve to close it, the contact surface between the valve flap 4 and the valve seat 5 may be mixed with impurities in the liquid, such as hard particles such as rust and sand, which may scratch the sealing surface. With long-term use, the sealing surface between the valve flap 4 and the valve seat 5 will inevitably leak. Further improvements are made on the basis of the above embodiments.

[0059] See also Figure 6 and Figure 7 As shown, a liquid inlet cavity 8 is formed between the rotating seat 52 and the base 51 , and a plurality of through holes 5221 equidistantly distributed are formed through the sealing plate 522 .

[0060] During use, when the rotating seat 52 moves upward, the volume of the liquid inlet chamber 8 gradually increases, and part of the fluid medium enters the liquid inlet chamber 8 through the multiple through holes 5221; when the rotating seat 52 moves downward, the volume of the liquid inlet chamber 8 gradually decreases and the fluid medium is discharged from the liquid inlet chamber 8. During the discharge process, the fluid medium will flush the surface of the sealing plate 522.

[0061] Through the arrangement of the sealing plate 522, the liquid inlet cavity 8 and the plurality of through holes 5221, when the rotating seat 52 moves downward, the fluid medium in the liquid inlet cavity 8 flows out from the through holes 5221 to flush the surface of the sealing plate 522, thereby preventing rust and hard particles from being caught in the sealing surfaces of the valve seat 5 and the valve disc 4, thereby preventing scratches and other problems, and further improving the service life of the valve seat 5.

[0062] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An integrated high-pressure stop valve, comprising a valve body (1) and a valve stem (2), characterized in that: The valve body (1) comprises an integrally formed first valve body (11) and a second valve body (12); the first valve body (11) and the second valve body (12) are coaxially arranged and fixedly connected to a same connecting piece (3); a main flow channel (111), an inlet flow channel (112) and an outlet flow channel (113) are provided in the first valve body (11); the valve stem (2) slides coaxially in the valve body (1); a valve flap (4) is coaxially arranged at one end of the valve stem (2) located in the main flow channel (111); a valve seat (5) matching the valve flap (4) is coaxially arranged at the connection point between the inlet flow channel (112) and the main flow channel (111); and the contact surface between the valve flap (4) and the valve seat (5) is conical; The angle between the axes of the outlet flow channel (113) and the main flow channel (111) is an acute angle, and the lowest point of the outlet flow channel (113) is higher than the valve seat (5); when the valve flap (4) and the valve seat (5) are in a sealed state, the valve flap (4) and the main flow channel (111) form a compression chamber (6); A pressure rotation mechanism (7) is arranged inside the valve seat (5).

2. The integrated high-pressure stop valve according to claim 1, characterized in that: A spline bushing (114) is coaxially arranged inside the first valve body (11), a spline matching the spline bushing (114) is arranged on the valve stem (2), a yoke bushing (121) is threadedly connected inside the second valve body (12), a yoke nut (122) is coaxially arranged inside the yoke bushing (121), an end of the valve stem (2) away from the valve disc (4) is threadedly connected to the yoke nut (122), and a hand wheel is coaxially fixed to the circumferential side of the yoke nut (122).

3. The integrated high-pressure stop valve according to claim 2, characterized in that: The valve flap (4) comprises a cylindrical connecting seat (41), the circumferential side of the connecting seat (41) contacts the side wall of the main flow channel (111), a notch groove is coaxially provided on the connecting seat (41), an end of the valve stem (2) close to the valve flap (4) is inserted into the inside of the notch groove, and a sealing block (42) is coaxially fixed to an end of the connecting seat (41) away from the valve stem (2), and a conical sealing surface is provided on the circumferential side of the sealing block (42).

4. The integrated high-pressure stop valve according to claim 3, characterized in that: A sealing platform (21) located between the valve disc (4) and the spline is coaxially fixed on the valve stem (2), and a rear seat (115) is coaxially fixed on one end of the spline bushing (114) close to the sealing platform (21), and the contact surface between the sealing platform (21) and the rear seat (115) is a conical surface.

5. The integrated high-pressure stop valve according to claim 4, characterized in that: The valve seat (5) comprises a base (51) and a rotating seat (52); the pressure rotating mechanism (7) comprises an annular groove (71) coaxially provided on the upper surface of the base (51); an annular plate (72) is coaxially provided on the rotating seat (52); the annular plate (72) is sealingly and slidably connected to the annular groove (71); an elastic member (73) is provided between the annular groove (71) and the annular plate (72); an annular rotating portion (74) is provided on the side wall of the annular groove (71); and a connecting portion matching the rotating portion (74) is provided on the side wall of the annular plate (72); When the valve flap (4) and the valve seat (5) gradually form a seal, the pressure in the compression chamber (6) gradually increases, the rotating seat (52) drives the annular plate (72) to move downward, and the rotating seat (52) rotates under the limit of the connecting portion and the rotating portion (74).

6. The integrated high-pressure stop valve according to claim 5, characterized in that: The rotating portion (74) comprises a plurality of inclined descending grooves (741) and ascending grooves (742), the plurality of descending grooves (741) and ascending grooves (742) being alternately arranged one by one and connected end to end, the plurality of ascending grooves (742) and descending grooves (741) forming an annular wave-like structure, and the peak-valley section and the peak-top section are both provided with guide grooves (743), the guide grooves (743) comprising a staggered section (7431) connected to the ascending groove (742) or the descending groove (741) and a horn section (7432); The connecting portion comprises a connecting rod (75), and one end of the connecting rod (75) away from the annular plate (72) is slidably disposed in the descending groove (741), the guiding groove (743) or the ascending groove (742); After the connecting rod (75) enters the guide groove (743) from the ascending groove (742), the connecting rod (75) moves in a direction close to the descending groove (741) under the guidance of the guide groove (743), so that the connecting rod (75) can enter the descending groove (741) when moving downward.

7. The integrated high-pressure stop valve according to claim 6, characterized in that: The rotating seat (52) comprises a pressure plate (521), a sealing plate (522) and a sliding plate (523); the pressure plate (521) is arranged parallel to the upper surface of the base (51), and the annular plate (72) is fixedly connected to the lower surface of the pressure plate (521); the sealing plate (522) is arranged obliquely and matches the sealing surface of the valve flap (4); the base (51) is provided with an inclined surface matching the sealing plate (522); and the base (51) is provided with an annular sliding groove (511) matching the sliding plate (523).

8. The integrated high-pressure stop valve according to claim 7, characterized in that: When the connecting seat (41) moves toward the side close to the valve seat (5), the distance that the lower surface of the connecting seat (41) exceeds the lowest point of the outlet flow channel (113) is the downward pressure gap D, the downward pressure distance of the rotating seat (52) is the movable gap d, and the downward pressure gap D is greater than the movable gap d.

9. The integrated high-pressure stop valve according to claim 8, characterized in that: A liquid inlet cavity (8) is formed between the rotating seat (52) and the base (51), and a plurality of through holes (5221) distributed at equal intervals are formed through the sealing plate (522).

10. The integrated high-pressure stop valve according to claim 9, characterized in that: A packing ring (116) located above the spline bushing (114) is arranged in the main channel (111), and a sealing bushing (117) in contact with the packing ring (116) is coaxially arranged at the end of the main channel (111); It also includes a packing flange (9) located between the first valve body (11) and the second valve body (12), wherein the packing flange (9) and the first valve body (11) are connected via bolts, and a side of the sealing bushing (117) away from the packing ring (116) is coaxially sleeved inside the packing flange (9).

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