A detachable fluorine-lined check valve

Abstract

The present invention relates to the field of valve technology, and specifically to a detachable fluorine-lined check valve, comprising a valve body, an outer valve core, a cleaning air bag, and an auxiliary mechanism; a water-passing cavity is provided in the valve body; a fluorine-lined layer is coated on the inner wall of the water-passing cavity; a partition is provided in the water-passing cavity; a connecting hole is provided on the partition; and the conical wall of the upper opening of the connecting hole is set as an upper sealing wall. A check spring is fixedly connected between the upper end of the outer valve core and the valve body; an inner valve core is provided on the lower end surface of the outer valve core to slide up and down; a limit assembly is provided between the inner valve core and the outer valve core; when the fluid hydraulic pressure is reduced to the point where the outer valve core cannot be pushed away from the connecting hole by overcoming the elastic force of the check spring, the auxiliary mechanism releases the limit of the inner valve core by the limit assembly, and the inner valve core, driven by inertia and the elastic force of the push spring, drives the cleaning air bag to move downward relative to the outer valve core to wipe and clean the impurities on the matching sealing wall and the upper sealing wall, so as to avoid the impurities causing wear of the matching sealing wall and the upper sealing wall, and improve the sealing performance between the matching sealing wall and the upper sealing wall.

Description

Technical Field

[0001] The invention relates to the technical field of valves, and in particular to a detachable fluorine-lined check valve. Background Art

[0002] A check valve is a valve whose opening and closing parts are circular discs and which rely on their own weight and medium pressure to produce movement to block the backflow of the medium. Check valves belong to the category of automatic valves, also known as non-return valves, one-way valves, reflux valves or isolation valves. According to the movement of the disc, check valves are divided into lift type and swing type. A valve that is lined with fluoroplastics in all places where the medium can reach is called a fluorine-lined check valve. Fluorine-lined valves are specially used to control corrosive or highly corrosive media. The inner surface of the valve body is covered with various fluoroplastics that can be selected. It is suitable for different working temperatures and fluid pipelines, and has the characteristics of high strength and good corrosion resistance.

[0003] In the prior art, for example, the Chinese patent with the announcement number CN217003246U, entitled a high-performance fluorine-lined check valve, states in the public technical solution that when there is no medium in the water inlet channel, the valve disc falls and closes the valve body to prevent the medium in the water outlet channel from flowing back. There may be certain impurities in the fluid, which may adhere to the contact sealing surface of the valve disc and the valve body. When the valve disc falls and contacts and impacts the valve body, the impurities may cause wear of the contact sealing surface of the valve disc and the valve body, thereby affecting the sealing performance of the valve. Summary of the invention

[0004] The present invention provides a detachable fluorine-lined check valve to solve the above problem.

[0005] A detachable fluorine-lined check valve of the present invention adopts the following technical scheme: a detachable fluorine-lined check valve comprises a valve body, an outer valve core, a cleaning air bag, and an auxiliary mechanism; a water passage cavity is provided in the valve body; a fluorine-lined layer is coated on the inner wall of the water passage cavity; a partition is provided in the water passage cavity; the partition divides the water passage cavity into an inlet cavity and an outlet cavity distributed up and down; the inlet cavity is located below the outlet cavity; a connecting hole with a vertical axis is provided on the partition; the connecting hole has a vertical axis; the connecting hole connects the inlet cavity and the outlet cavity; the upper opening of the connecting hole is a cone with the large end facing upward, and the conical wall of the upper opening of the connecting hole is set as an upper sealing wall.

[0006] The outer valve core is cylindrical and coaxial with the connecting hole; the outer valve core is arranged in the water outlet cavity for upward and downward movement, and a check spring is fixedly connected between the upper end of the outer valve core and the valve body; the side wall of the lower end of the outer valve core is a tapered wall with the small end facing downward; the tapered wall of the outer valve core is set as a matching sealing wall; a circular ring-shaped matching groove is provided on the lower end surface of the outer valve core; the diameter of the matching groove is smaller than the diameter of the connecting hole; the matching groove and the connecting hole are coaxial; an inner valve core is provided in the matching groove for upward and downward sliding; a pushing spring is connected between the inner valve core and the outer valve core; a limiting assembly is provided between the inner valve core and the outer valve core; when the fluid hydraulic pressure overcomes the check spring to push the outer valve core away from the connecting hole, so that the fluid passes through the connecting hole from the water inlet cavity into the water outlet cavity, the limiting assembly limits the inner valve core to the matching groove, and makes the pushing spring in a compressed and force-accumulated state; a cleaning air bag is arranged between the matching sealing wall and the upper sealing wall, and the cleaning air bag is elastic and fixed at the lower end of the side wall of the inner valve core.

[0007] When the fluid hydraulic pressure is reduced to a level that cannot overcome the check spring force to push the outer valve core away from the connecting hole, the check spring drives the outer valve core downward to squeeze the cleaning air bag between the mating sealing wall and the upper sealing wall. When the cleaning air bag buffers and decelerates the impact of the outer valve core moving downward, the auxiliary mechanism releases the limit of the inner valve core by the limit assembly. Driven by inertia and the push spring force, the inner valve core drives the cleaning air bag to move downward relative to the outer valve core, dragging the cleaning air bag out of the gap between the mating sealing wall and the upper sealing wall to wipe and clean impurities on the mating sealing wall and the upper sealing wall.

[0008] Furthermore, the cleaning airbag is in the shape of a ring; the cleaning airbag is coaxially sleeved on the side wall of the inner valve core; an annular installation opening is provided on the side wall of the cleaning airbag close to the inner valve core; the two opening edges of the installation opening are distributed up and down; the installation opening and the inner valve core are coaxial; the opening edge above the installation opening is fixed on the side wall of the inner valve core, and the opening edge below the installation opening is fixed on the lower end of the inner valve core.

[0009] Furthermore, a cylindrical sliding groove is provided on the upper end surface of the inner valve core; the groove wall of the sliding groove and the inner groove wall of the matching groove are slidingly matched; the outer wall of the inner valve core and the outer groove wall of the matching groove are slidingly matched; an adjusting hole arranged vertically along the axis is provided at the axis of the outer valve core; an adjusting airbag is fixedly connected to the upper orifice of the adjusting hole; an adjusting spring is provided in the adjusting airbag; the adjusting airbag and the adjusting hole are connected; a balancing hole is provided at the upper end of the side wall of the adjusting hole; the balancing hole connects the matching groove and the adjusting hole; when the inner valve core moves downward relative to the outer valve core, the air in the adjusting airbag is sucked into the matching groove through the adjusting hole.

[0010] Furthermore, a buffer airbag is fixed on the bottom wall of the sliding groove; the buffer airbag is connected to the cleaning airbag through an air passage; a buffer spring is arranged in the buffer airbag. When the outer valve core moves downward to squeeze the cleaning airbag between the matching sealing wall and the upper sealing wall for buffering, part of the air in the cleaning airbag is squeezed into the buffer airbag through the air passage, and the buffer spring is stretched for buffering at the same time.

[0011] Furthermore, the limit assembly includes a permanent magnet and an electromagnetic ring; the permanent magnet is coaxially fixed on the upper end surface of the inner valve core; the electromagnetic ring is coaxially fixed on the upper groove wall of the matching groove; when the fluid hydraulic pressure overcomes the check spring to push the outer valve core away from the connecting hole, so that the fluid passes through the connecting hole from the water inlet chamber into the water outlet chamber, the auxiliary mechanism makes the permanent magnet and the electromagnetic ring have opposite magnetic poles, and the permanent magnet and the electromagnetic ring are magnetically adsorbed and abutted. When the fluid hydraulic pressure in the water inlet chamber is reduced to a level that cannot overcome the elastic force of the check spring to push the outer valve core away from the connecting hole, the check spring drives the outer valve core to move downward to squeeze the cleaning air bag between the matching sealing wall and the upper sealing wall. When the cleaning air bag buffers and decelerates the impact of the outer valve core moving downward, the auxiliary mechanism makes the permanent magnet and the electromagnetic ring have the same magnetic poles. The combined force of the repulsive force between the electromagnetic ring and the permanent magnet and the elastic force of the push spring assists the inertia of the inner valve core moving downward, drives the inner valve core to continue to move downward, and drags the cleaning air bag out of the gap between the matching sealing wall and the upper sealing wall to wipe and clean impurities on the matching sealing wall and the upper sealing wall.

[0012] Furthermore, the lower opening of the communicating hole is in a cone shape with the larger end facing downward, and the conical wall of the lower opening of the communicating hole is set as a lower sealing wall; the hole wall of the communicating hole between the upper sealing wall and the lower sealing wall is set as a middle sealing wall.

[0013] Furthermore, a reverse sealing assembly is provided between the cleaning air bag and the inner valve core; in the process that the lower end of the inner valve core drives the cleaning air bag to continue to move downward through the connecting hole, when the lower end of the inner valve core drives the cleaning air bag to pass through the middle sealing wall, the reverse sealing assembly drives the cleaning air bag to clean the middle sealing wall, and when the cleaning air bag moves to the lower sealing wall, the reverse sealing assembly causes the cleaning air bag to stick to the lower sealing wall for reverse auxiliary sealing.

[0014] Furthermore, the reverse sealing assembly includes an installation groove; the installation groove is arranged on the side wall of the inner valve core and is located in the cleaning air bag; the installation groove is an annular groove; a push rod is arranged in the installation groove; the push rod is arranged to be inclined up and down along the radial direction of the inner valve core; a rotating shaft is fixed to the upper end of the push rod; the rotating shaft is arranged horizontally and along the tangential direction of the inner valve core; the rotating shaft is rotatably installed on the groove wall of the installation groove; a torsion spring is connected between the rotating shaft and the groove wall of the installation groove; when the permanent magnet ring and the electromagnetic ring are in contact, the lower end of the push rod presses the cleaning air bag between the inner valve core and the outer valve core against the outer groove wall of the matching groove. When the cleaning airbag passes through the middle sealing wall, the torsion spring drives the push rod to rotate upward and pop out, pressing the cleaning airbag against the middle sealing wall. As the cleaning airbag moves downward, the middle sealing wall is cleaned. When the cleaning airbag moves to the lower sealing wall, the torsion spring drives the push rod to rotate upward to press the cleaning airbag against the lower sealing wall. The torsion spring makes the cleaning airbag stick to the lower sealing wall through the push rod to perform reverse auxiliary sealing, so as to improve the sealing effect after the upper sealing wall and the matching sealing wall abut against the check valve. When the hydraulic pressure in the water inlet chamber increases to a level sufficient to overcome the elastic force of the check spring and push the outer valve core away from the connecting hole, the fluid pushes the inner valve core upward, overcomes the elastic force of the torsion spring and causes the push rod to rotate downward, so that the inner valve core moves toward the outer valve core through the connecting hole.

[0015] Furthermore, the auxiliary mechanism is arranged in the outer valve core; the auxiliary mechanism includes a speed sensor and a controller; the speed sensor and the controller are electrically connected; the controller and the electromagnetic coil are electrically connected; the speed sensor detects the speed of the outer valve core and transmits a signal to the controller to control the magnitude and direction of the current in the electromagnetic coil; when the fluid hydraulic pressure in the water inlet chamber is reduced to a level that cannot overcome the elastic force of the check spring to push the outer valve core away from the connecting hole, the check spring drives the outer valve core to move downward, the speed sensor detects the speed of the outer valve core and transmits a signal to the controller, and when the cleaning air bag is squeezed between the matching sealing wall and When the outer valve core moves downward, the controller changes the direction of the electromagnetic coil current so that the magnetic poles of the electromagnetic coil and the permanent magnet coil are the same; and when the outer valve core moves downward at a smaller speed, the controller makes the current in the electromagnetic coil larger, so that the repulsive force between the electromagnetic coil and the permanent magnet coil is larger; when the outer valve core moves downward at a larger speed, the controller makes the current in the electromagnetic coil smaller, so that the repulsive force between the electromagnetic coil and the permanent magnet coil is smaller, so as to adjust the downward repulsive force provided by the permanent magnet coil and the electromagnetic coil to the inner valve core according to the downward speed of the outer valve core, so as to ensure that the inner valve core has sufficient downward moving force to reach the lower sealing wall for reverse sealing.

[0016] Furthermore, a disassembly port is provided at the upper end of the water outlet chamber; an upper cover is fixed to the disassembly port by bolts; and a check spring is fixedly connected to the valve body through the upper cover.

[0017] The beneficial effect of the present invention is that when the fluid hydraulic pressure is reduced to a level that cannot overcome the elastic force of the check spring to push the outer valve core away from the connecting hole, the check spring drives the outer valve core to move downward to squeeze the cleaning air bag between the mating sealing wall and the upper sealing wall. When the cleaning air bag buffers and decelerates the impact of the outer valve core moving downward, the auxiliary mechanism releases the limit of the inner valve core by the limit assembly. Driven by inertia and the elastic force of the push spring, the inner valve core drives the cleaning air bag to move downward relative to the outer valve core, and drags the cleaning air bag out of the gap between the mating sealing wall and the upper sealing wall to wipe and clean impurities on the mating sealing wall and the upper sealing wall, thereby avoiding impurities causing wear of the mating sealing wall and the upper sealing wall when the outer valve core falls to the mating sealing wall and the upper sealing wall and impacts them, thereby improving the sealing between the mating sealing wall and the upper sealing wall.

[0018] Furthermore, when the cleaning air bag passes through the middle sealing wall, the torsion spring drives the push rod to rotate upward and pop out, pressing the cleaning air bag against the middle sealing wall. As the cleaning air bag moves downward, the middle sealing wall is cleaned. When the cleaning air bag moves to the lower sealing wall, the torsion spring drives the push rod to rotate upward to press the cleaning air bag against the lower sealing wall. The torsion spring causes the cleaning air bag to be stuck on the lower sealing wall through the push rod, performing reverse auxiliary sealing to enhance the sealing effect after the upper sealing wall and the matching sealing wall abut against the non-return shut-off. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0020] Figure 1 It is a structural schematic diagram of an embodiment of a detachable fluorine-lined check valve of the present invention;

[0021] Figure 2 It is a cross-sectional view of an embodiment of a detachable fluorine-lined check valve of the present invention;

[0022] Figure 3 for Figure 2 The enlarged view of point A in the middle;

[0023] Figure 4 for Figure 3 The enlarged view of point B in the middle;

[0024] Figure 5 An exploded view of the internal structure of an embodiment of a detachable fluorine-lined check valve of the present invention;

[0025] Figure 6 for Figure 5 Enlarged view of point C in the middle;

[0026] Figure 7 It is a cross-sectional view of an outer valve core of an embodiment of a detachable fluorine-lined check valve of the present invention;

[0027] Figure 8 It is a cross-sectional view of an inner valve core of an embodiment of a detachable fluorine-lined check valve of the present invention;

[0028] Fig. 9 It is a schematic diagram of a cleaning air bag of an embodiment of a detachable fluorine-lined check valve of the present invention being squeezed between a matching sealing wall and an upper sealing wall.

[0029] In the figure: 100, valve body; 110, water inlet chamber; 120, water outlet chamber; 130, connecting hole; 131, upper sealing wall; 132, middle sealing wall; 133, lower sealing wall; 140, upper cover; 150, fluorine lining layer; 200, outer valve core; 210, matching sealing wall; 220, matching groove; 230, adjusting hole; 231, balancing hole; 240, adjusting airbag; 250, check spring; 300, inner valve core; 310, sliding groove; 320, buffer airbag; 321, airway; 330, push spring; 410, mounting groove; 420, push rod; 430, rotating shaft; 510, permanent magnet; 520, electromagnetic coil; 600, cleaning airbag; 610, mounting opening; 700, speed sensor. DETAILED DESCRIPTION

[0030] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] An embodiment of a detachable fluorine-lined check valve of the present invention is as follows Figures 1 to 9As shown: a detachable fluorine-lined check valve, including a valve body 100, an outer valve core 200, a cleaning air bag 600, and an auxiliary mechanism; a water passage cavity is provided in the valve body 100; a fluorine-lined layer 150 is coated on the inner wall of the water passage cavity; a partition is provided in the water passage cavity; the partition divides the water passage cavity into an inlet cavity 110 and an outlet cavity 120 distributed up and down; the inlet cavity 110 is located below the outlet cavity 120; a disassembly port is provided at the upper end of the outlet cavity 120; an upper cover 140 is fixed to the disassembly port by bolts. A connecting hole 130 with a vertical axis is provided on the partition; the connecting hole 130 has a vertical axis; the connecting hole 130 connects the water inlet chamber 110 and the water outlet chamber 120; the upper hole opening of the connecting hole 130 is a cone with the large end facing upward, and the conical wall of the upper hole opening of the connecting hole 130 is set as an upper sealing wall 131; the lower hole opening of the connecting hole 130 is a cone with the large end facing downward, and the conical wall of the lower hole opening of the connecting hole 130 is set as a lower sealing wall 133; the hole wall of the connecting hole 130 between the upper sealing wall 131 and the lower sealing wall 133 is set as a middle sealing wall 132.

[0032] The outer valve core 200 is cylindrical and coaxial with the connecting hole 130; the outer valve core 200 is arranged in the water outlet cavity 120 to move up and down, and a check spring 250 is fixedly connected between the upper end of the outer valve core 200 and the valve body 100; the check spring 250 is fixedly connected to the valve body 100 through the upper cover 140. The side wall of the lower end of the outer valve core 200 is a tapered wall with the small end facing downward; the tapered wall of the outer valve core 200 is set as a matching sealing wall 210; a circular ring-shaped matching groove 220 is provided on the lower end surface of the outer valve core 200; the diameter of the matching groove 220 is smaller than the diameter of the connecting hole 130; the matching groove 220 and the connecting hole 130 are coaxial; the inner valve core 300 is slidably arranged in the matching groove 220; a push spring 330 is connected between the inner valve core 300 and the outer valve core 200.

[0033] A cylindrical sliding groove 310 is provided on the upper end surface of the inner valve core 300; the groove wall of the sliding groove 310 and the inner groove wall of the matching groove 220 are slidably matched; the outer wall of the inner valve core 300 and the outer groove wall of the matching groove 220 are slidably matched; an adjusting hole 230 with a vertical axis is provided at the axis of the outer valve core 200; an adjusting airbag 240 is fixedly connected to the upper orifice of the adjusting hole 230; an adjusting spring is provided in the adjusting airbag 240; the adjusting airbag 240 and the adjusting hole 230 are connected; a balancing hole 231 is provided at the upper end of the side wall of the adjusting hole 230; the balancing hole 231 connects the matching groove 220 and the adjusting hole 230; when the inner valve core 300 moves downward relative to the outer valve core 200, the air in the adjusting airbag 240 is sucked into the matching groove 220 through the adjusting hole 230.

[0034] A buffer airbag 320 is fixed on the bottom wall of the sliding groove 310; the buffer airbag 320 is connected to the cleaning airbag 600 through the air passage 321; a buffer spring is arranged inside the buffer airbag 320. When the outer valve core 200 moves downward to squeeze the cleaning airbag 600 between the matching sealing wall 210 and the upper sealing wall 131 for buffering, part of the air in the cleaning airbag 600 is squeezed into the buffer airbag 320 through the air passage 321, and the buffer spring is stretched for buffering at the same time.

[0035] A limit assembly is provided between the inner valve core 300 and the outer valve core 200; when the fluid hydraulic pressure overcomes the check spring 250 to push the outer valve core 200 away from the connecting hole 130, allowing the fluid to enter the water outlet chamber 120 from the water inlet chamber 110 through the connecting hole 130, the limit assembly limits the inner valve core 300 to the matching groove 220 and puts the push spring 330 in a compressed and force-accumulating state.

[0036] The limit assembly includes a permanent magnet ring 510 and an electromagnetic ring 520; the permanent magnet ring 510 is coaxially fixed on the upper end surface of the inner valve core 300; the electromagnetic ring 520 is coaxially fixed on the upper groove wall of the matching groove 220; when the fluid hydraulic pressure overcomes the check spring 250 to push the outer valve core 200 away from the connecting hole 130, so that the fluid passes through the connecting hole 130 from the water inlet chamber 110 into the water outlet chamber 120, the auxiliary mechanism makes the permanent magnet ring 510 and the electromagnetic ring 520 have opposite magnetic poles, and the permanent magnet ring 510 and the electromagnetic ring 520 are magnetically adsorbed and abutted. When the fluid hydraulic pressure in the water inlet chamber 110 is reduced to a level that cannot overcome the elastic force of the check spring 250 to push the outer valve core 200 away from the connecting hole 130, the check spring 250 is pressed against the outer valve core 200. 50 drives the outer valve core 200 to move downward to squeeze the cleaning airbag 600 between the matching sealing wall 210 and the upper sealing wall 131. When the cleaning airbag 600 buffers and decelerates the impact of the outer valve core 200 moving downward, the auxiliary mechanism makes the permanent magnet ring 510 and the electromagnetic ring 520 have the same magnetic poles. The repulsive force between the electromagnetic ring 520 and the permanent magnet ring 510 and the elastic force of the push spring 330 assist the inertia of the inner valve core 300 to move downward, driving the inner valve core 300 to continue to move downward, dragging the cleaning airbag 600 out of the gap between the matching sealing wall 210 and the upper sealing wall 131 to wipe and clean the impurities on the matching sealing wall 210 and the upper sealing wall 131.

[0037] The cleaning airbag 600 is arranged between the matching sealing wall 210 and the upper sealing wall 131, the cleaning airbag 600 is elastic and fixed to the lower end of the side wall of the inner valve core 300; the cleaning airbag 600 is annular; the cleaning airbag 600 is coaxially sleeved on the side wall of the inner valve core 300; an annular installation opening 610 is provided on the side wall of the cleaning airbag 600 close to the inner valve core 300; the two opening edges of the installation opening 610 are distributed up and down; the installation opening 610 and the inner valve core 300 are coaxial; the opening edge above the installation opening 610 is fixed on the side wall of the inner valve core 300, and the opening edge below the installation opening 610 is fixed to the lower end of the inner valve core 300.

[0038] A reverse sealing assembly is provided between the cleaning airbag 600 and the inner valve core 300; when the lower end of the inner valve core 300 drives the cleaning airbag 600 to continue to move downward through the communicating hole 130, when the lower end of the inner valve core 300 drives the cleaning airbag 600 to pass through the middle sealing wall 132, the reverse sealing assembly drives the cleaning airbag 600 to clean the middle sealing wall 132, and when the cleaning airbag 600 moves to the lower sealing wall 133, the reverse sealing assembly causes the cleaning airbag 600 to be stuck on the lower sealing wall 133 to perform reverse auxiliary sealing. The reverse sealing assembly includes a mounting groove 410.

[0039] The mounting groove 410 is arranged on the side wall of the inner valve core 300 and is located in the cleaning air bag 600; the mounting groove 410 is an annular groove; a push rod 420 is arranged in the mounting groove 410; the push rod 420 is arranged to be inclined up and down along the radial direction of the inner valve core 300; a rotating shaft 430 is fixed to the upper end of the push rod 420; the rotating shaft 430 is arranged horizontally and along the tangential direction of the inner valve core 300; the rotating shaft 430 is rotatably mounted on the groove wall of the mounting groove 410; a torsion spring is connected between the rotating shaft 430 and the groove wall of the mounting groove 410; when the permanent magnet ring 510 and the electromagnetic ring 520 are in contact, the lower end of the push rod 420 presses the cleaning air bag 600 between the inner valve core 300 and the outer valve core 200 against the outer groove wall of the matching groove 220. When the cleaning air bag 600 passes through the middle sealing wall 132, the torsion spring drives the push rod 420 to rotate upward and pop out, pressing the cleaning air bag 600 against the middle sealing wall 132. As the cleaning air bag 600 moves downward, the middle sealing wall 132 is cleaned. When the cleaning air bag 600 moves to the lower sealing wall 133, the torsion spring drives the push rod 420 to rotate upward to press the cleaning air bag 600 against the lower sealing wall 133. The torsion spring causes the cleaning air bag 600 to be stuck on the lower sealing wall 133 through the push rod 420 to perform reverse auxiliary sealing to enhance the sealing effect after the upper sealing wall 131 and the matching sealing wall 210 abut against the non-return shut-off. When the hydraulic pressure in the water inlet chamber 110 increases to a level sufficient to overcome the elastic force of the check spring 250 and push the outer valve core 200 away from the connecting hole 130, the fluid pushes up the inner valve core 300, overcoming the elastic force of the torsion spring to cause the push rod 420 to rotate downward, so that the inner valve core 300 moves toward the outer valve core 200 through the connecting hole 130.

[0040] When the fluid hydraulic pressure is reduced to a level that cannot overcome the elastic force of the check spring 250 to push the outer valve core 200 away from the connecting hole 130, the check spring 250 drives the outer valve core 200 to move downward to squeeze the cleaning airbag 600 between the mating sealing wall 210 and the upper sealing wall 131. When the cleaning airbag 600 buffers and decelerates the impact of the downward movement of the outer valve core 200, the auxiliary mechanism releases the limit of the inner valve core 300 by the limit assembly. Driven by inertia and the elastic force of the push spring 330, the inner valve core 300 drives the cleaning airbag 600 to move downward relative to the outer valve core 200, and drags the cleaning airbag 600 out of the gap between the mating sealing wall 210 and the upper sealing wall 131 to wipe and clean impurities on the mating sealing wall 210 and the upper sealing wall 131.

[0041] The auxiliary mechanism is arranged in the outer valve core 200; the auxiliary mechanism includes a speed sensor 700 and a controller; the speed sensor 700 is electrically connected to the controller; the controller is electrically connected to the electromagnetic coil 520; the speed sensor 700 detects the speed of the outer valve core 200 and transmits a signal to the controller to control the magnitude and direction of the current in the electromagnetic coil 520; when the fluid hydraulic pressure in the water inlet chamber 110 is reduced to a level that cannot overcome the elastic force of the check spring 250 to push the outer valve core 200 away from the connecting hole 130, and the check spring 250 drives the outer valve core 200 to move downward, the speed sensor 700 detects the speed of the outer valve core 200 and transmits a signal to the controller, and when the cleaning air bag 600 is squeezed between the matching sealing wall 210 and the upper sealing wall 131, the controller changes the current direction of the electromagnetic coil 520 so that the magnetic poles of the electromagnetic coil 520 and the permanent magnet coil 510 are the same; and when the downward speed of the outer valve core 200 is smaller, the current in the electromagnetic coil 520 is increased by the controller, so that the repulsive force between the electromagnetic coil 520 and the permanent magnet coil 510 is larger; when the downward speed of the outer valve core 200 is larger, the current in the electromagnetic coil 520 is decreased by the controller, so that the repulsive force between the electromagnetic coil 520 and the permanent magnet coil 510 is smaller, so as to adjust the downward repulsive force provided by the permanent magnet coil 510 and the electromagnetic coil 520 to the inner valve core 300 according to the downward speed of the outer valve core 200, so as to ensure that the inner valve core 300 has sufficient downward moving force to reach the lower sealing wall 133 for reverse sealing.

[0042] In combination with the above embodiments, the use principle and working process of the present invention are as follows: the fluid pushes the inner valve core 300 and the outer valve core 200 to overcome the check spring 250 and move upward synchronously, so that the fluid enters the water outlet chamber 120 from the water inlet chamber 110 through the connecting hole 130.

[0043] When the fluid hydraulic pressure is reduced to a level that cannot overcome the elastic force of the check spring 250 to push the outer valve core 200 away from the connecting hole 130, the check spring 250 drives the outer valve core 200 to move downward to squeeze the cleaning airbag 600 between the matching sealing wall 210 and the upper sealing wall 131. When the cleaning airbag 600 buffers and decelerates the impact of the outer valve core 200 moving downward, the speed sensor 700 detects the speed of the outer valve core 200 and transmits the signal to the controller, and when the cleaning airbag 600 is squeezed between the matching sealing wall 210 and the upper sealing wall 131, the controller changes the current direction of the electromagnetic coil 520 so that the magnetic poles of the electromagnetic coil 520 and the permanent magnet coil 510 are the same; the combined force of the repulsive force between the electromagnetic coil 520 and the permanent magnet coil 510 and the elastic force of the push spring 330 assists the inertia of the inner valve core 300 to move downward, driving the inner valve core 300 to continue to move downward, dragging the cleaning airbag 600 out of the gap between the matching sealing wall 210 and the upper sealing wall 131, so as to wipe and clean the impurities on the matching sealing wall 210 and the upper sealing wall 131. The inner valve core 300 drives the cleaning airbag 600 to continue to move downward in the connecting hole 130. When the cleaning air bag 600 passes through the middle sealing wall 132, the torsion spring drives the push rod 420 to rotate upward and pop out, pressing the cleaning air bag 600 against the middle sealing wall 132. As the cleaning air bag 600 moves downward, the middle sealing wall 132 is cleaned. When the cleaning air bag 600 moves to the lower sealing wall 133, the torsion spring drives the push rod 420 to rotate upward to press the cleaning air bag 600 against the lower sealing wall 133. The torsion spring causes the cleaning air bag 600 to be stuck on the lower sealing wall 133 through the push rod 420 to perform reverse auxiliary sealing to enhance the sealing effect after the upper sealing wall 131 and the matching sealing wall 210 abut against the non-return shut-off. When the hydraulic pressure in the water inlet chamber 110 increases to a level sufficient to overcome the elastic force of the check spring 250 and push the outer valve core 200 away from the connecting hole 130, the fluid pushes up the inner valve core 300, overcomes the elastic force of the torsion spring and causes the push rod 420 to rotate downward, so that the inner valve core 300 moves toward the outer valve core 200 through the connecting hole 130, and the inner valve core 300 drives the outer valve core 200 to move upward. The speed sensor 700 detects the speed change of the outer valve core 200 and transmits the signal to the controller, and the controller makes the magnetic poles of the electromagnetic coil 520 and the permanent magnet coil 510 opposite, so that the electromagnetic coil 520 and the permanent magnet coil 510 abut and adsorb. The fluid pushes the inner valve core 300 and the outer valve core 200 again to overcome the check spring 250 and move upward synchronously, so that the fluid enters the water outlet chamber 120 from the water inlet chamber 110 through the connecting hole 130.

[0044] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A detachable fluorine-lined check valve, Features: Including valve body, outer valve core, cleaning air bag and auxiliary mechanism; A water passage cavity is provided in the valve body; a fluorine lining layer is coated on the inner wall of the water passage cavity; a partition is provided in the water passage cavity; the partition divides the water passage cavity into an inlet cavity and an outlet cavity which are distributed up and down; the inlet cavity is located below the outlet cavity; a connecting hole with a vertical axis is provided on the partition; the connecting hole has a vertical axis; the connecting hole connects the inlet cavity and the outlet cavity; the upper opening of the connecting hole is in a cone shape with the large end facing upward, and the conical wall of the upper opening of the connecting hole is set as an upper sealing wall; The outer valve core is cylindrical and coaxial with the connecting hole; the outer valve core is arranged in the water outlet cavity for upward and downward movement, and a check spring is fixedly connected between the upper end of the outer valve core and the valve body; the side wall of the lower end of the outer valve core is a tapered wall with the small end facing downward; the tapered wall of the outer valve core is set as a matching sealing wall; a circular ring-shaped matching groove is provided on the lower end surface of the outer valve core; the matching groove and the connecting hole are coaxial; an inner valve core is provided in the matching groove for upward and downward sliding; a push spring is connected between the inner valve core and the outer valve core; a limit assembly is provided between the inner valve core and the outer valve core; when the fluid hydraulic pressure overcomes the check spring to push the outer valve core away from the connecting hole, so that the fluid passes through the connecting hole from the water inlet cavity into the water outlet cavity, the limit assembly limits the inner valve core to the matching groove, and makes the push spring in a compressed and stored state; The cleaning air bag is arranged between the matching sealing wall and the upper sealing wall, and the cleaning air bag is elastic and fixed at the lower end of the side wall of the inner valve core; When the fluid hydraulic pressure is reduced to a level that cannot overcome the elastic force of the check spring to push the outer valve core away from the connecting hole, the check spring drives the outer valve core downward to squeeze the cleaning air bag between the matching sealing wall and the upper sealing wall, and the auxiliary mechanism releases the limit of the inner valve core by the limit assembly. The inner valve core, driven by inertia and the elastic force of the push spring, drives the cleaning air bag to move downward relative to the outer valve core. The cleaning air bag is annular; the cleaning air bag is coaxially sleeved on the side wall of the inner valve core; an annular mounting opening is provided on the side wall of the cleaning air bag close to the inner valve core; the two opening edges of the mounting opening are distributed up and down; the mounting opening and the inner valve core are coaxial; the opening edge above the mounting opening is fixed on the side wall of the inner valve core, and the opening edge below the mounting opening is fixed on the lower end of the inner valve core, and a cylindrical sliding groove is provided on the upper end surface of the inner valve core; the groove wall of the sliding groove and the inner groove wall of the matching groove are slidingly matched; the outer side wall of the inner valve core and the outer groove wall of the matching groove are slidingly matched; An adjusting hole vertically arranged on the axis of the outer valve core is provided; an adjusting airbag is fixedly connected to the upper orifice of the adjusting hole; an adjusting spring is provided in the adjusting airbag; the adjusting airbag is connected to the adjusting hole; a balancing hole is provided at the upper end of the side wall of the adjusting hole; the balancing hole connects the matching groove and the adjusting hole, and a buffer airbag is fixed on the bottom wall of the sliding groove; the buffer airbag is connected to the cleaning airbag through the airway; a buffer spring is provided in the buffer airbag, and the limit assembly includes a permanent magnet ring and an electromagnetic ring; the permanent magnet ring is coaxially fixed on the upper end face of the inner valve core; the electromagnetic ring is coaxially fixed on the upper groove wall of the matching groove, the lower orifice of the communicating hole is a cone with the large end facing downward, and the tapered wall of the lower orifice of the communicating hole is set as a lower sealing wall; the communicating hole between the upper sealing wall and the lower sealing wall The hole wall is set as the middle sealing wall, and a reverse sealing component is provided between the cleaning air bag and the inner valve core; in the process that the lower end of the inner valve core drives the cleaning air bag to continue to move downward through the connecting hole, when the lower end of the inner valve core drives the cleaning air bag to pass through the middle sealing wall, the reverse sealing component drives the cleaning air bag to clean the middle sealing wall, and when the cleaning air bag moves to the lower sealing wall, the reverse sealing component makes the cleaning air bag stick to the lower sealing wall to perform reverse auxiliary sealing, and the reverse sealing component includes a mounting groove; the mounting groove is set on the side wall of the inner valve core and is in the cleaning air bag; the mounting groove is an annular groove; a push rod is provided in the mounting groove; the push rod is inclined up and down along the radial direction of the inner valve core; a rotating shaft is fixed to the upper end of the push rod; the rotating shaft is horizontally set and along the tangent direction of the inner valve core Setting; the rotating shaft is rotatably installed on the groove wall of the installation groove; a torsion spring is connected between the rotating shaft and the groove wall of the installation groove; when the permanent magnetic ring and the electromagnetic ring are in contact, the lower end of the push rod presses the cleaning air bag between the inner valve core and the outer valve core against the outer groove wall of the matching groove; when the cleaning air bag is squeezed between the matching sealing wall and the upper sealing wall, the controller changes the current direction of the electromagnetic ring to make the magnetic poles of the electromagnetic ring and the permanent magnetic ring the same. When in use, when the fluid hydraulic pressure is reduced to the point where it cannot overcome the elastic force of the check spring to push the outer valve core away from the connecting hole, the check spring drives the outer valve core to move downward to squeeze the cleaning air bag between the matching sealing wall and the upper sealing wall. When the cleaning air bag buffers and decelerates the impact of the outer valve core moving downward, the auxiliary mechanism releases the limit of the limit assembly on the inner valve core. Driven by inertia and the elastic force of the pushing spring, the inner valve core drives the cleaning air bag to move downward relative to the outer valve core, dragging the cleaning air bag out of the gap between the matching sealing wall and the upper sealing wall to wipe and clean the impurities on the matching sealing wall and the upper sealing wall. When the cleaning air bag passes through the middle sealing wall, the torsion spring drives the push rod to rotate upward and pop out, pressing the cleaning air bag against the middle sealing wall. As the cleaning air bag moves downward, the middle sealing wall is cleaned. When the cleaning air bag moves to the lower sealing wall, the torsion spring drives the push rod to rotate upward to press the cleaning air bag against the lower sealing wall. The torsion spring causes the cleaning air bag to be stuck on the lower sealing wall through the push rod for reverse auxiliary sealing to enhance the sealing effect after the upper sealing wall and the matching sealing wall abut against the non-return interception.

2. A detachable fluorine-lined check valve according to claim 1, Features: The auxiliary mechanism is arranged in the outer valve core; the auxiliary mechanism includes a speed sensor and a controller; the speed sensor and the controller are electrically connected; the controller and the electromagnetic coil are electrically connected; the speed sensor detects the speed of the outer valve core and transmits a signal to the controller to control the magnitude and direction of the current in the electromagnetic coil.

3. A detachable fluorine-lined check valve according to claim 1, Features: A disassembly port is arranged at the upper end of the water outlet cavity; an upper cover is fixed on the disassembly port by bolts; and a check spring is fixedly connected with the valve body through the upper cover.

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