A controllable swing check valve

Abstract

A controllable swing check valve, comprising a valve body, a valve core assembly, and an adjusting mechanism. The valve core assembly includes a valve stem and a circular valve flap located at the lower end of the valve stem. The adjusting mechanism includes a rotating air shaft drivingly connected to the valve stem, a fixed sleeve fixedly connected to the valve body, and a pneumatic regulator for controlling the air pressure inside the rotating air shaft. The rotating air shaft is sleeved inside the fixed sleeve. A radially fixed arc-shaped telescopic block is connected to the outer surface of the rotating air shaft. The arc-shaped telescopic block extends circumferentially relative to the outer edge of the rotating air shaft. An arc-shaped inner pressure cavity communicating with the pneumatic regulator is provided inside the arc-shaped telescopic block. The pneumatic regulator is used to control the elongation and compression of the arc-shaped telescopic block. The fixed sleeve is provided with an arc-shaped track groove corresponding to the arc-shaped telescopic block. A return spring is provided inside the arc-shaped track groove. One end of the return spring is connected to the inner wall of the arc-shaped track groove, and the other end of the return spring is connected to the end of the arc-shaped telescopic block.

Description

Technical Field

[0001] The present invention relates to the field of valves, and particularly to a controllable swing check valve. Background Art

[0002] A check valve refers to a valve whose closing member is a circular valve flap and which blocks the reverse flow of the medium by its own weight and the action of the medium pressure. It belongs to the category of automatic valves and is also called a non-return valve, a one-way valve, a reflux valve or an isolation valve. The movement mode of the valve flap is divided into a lifting type and a swing type. The lifting check valve is similar in structure to a globe valve, only lacking a valve stem for driving the valve flap. The medium flows in from the inlet end (lower side) and flows out from the outlet end (upper side). When the inlet pressure is greater than the sum of the valve flap weight and its flow resistance, the valve is opened. Conversely, when the medium flows backward, the valve closes.

[0003] The prior art, such as a check valve rocker and a check valve disclosed in the application number CN2008202000966, specifically discloses a check valve rocker. The rocker is connected to the valve flap, the front end of the rocker is connected to the valve body of the check valve through a pin shaft, and a buffer device is provided at the end of the rocker, but it cannot achieve pressure control of the check valve. Summary of the Invention

[0004] In order to solve the above problems, the present invention provides a controllable swing check valve:

[0005] A controllable swing check valve includes a valve body, a valve core assembly, and an adjustment mechanism.

[0006] The valve body is provided with a liquid inlet channel, a liquid outlet channel, and an intermediate adjustment chamber, and the adjustment chamber communicates with the liquid inlet channel and the liquid outlet channel respectively.

[0007] The valve core assembly includes a valve stem and a circular valve flap located at the lower end of the valve stem. The valve stem is an arc-shaped rod structure. The circular valve flap is adapted to the liquid inlet channel, and the circular valve flap is used to control the opening and closing of the liquid inlet channel.

[0008] The adjustment mechanism includes a rotary air shaft drivingly connected to the valve stem, a fixed sleeve fixedly connected to the valve body, and a pneumatic regulator for controlling the air pressure inside the rotary air shaft.

[0009] The rotary air shaft is sleeved in the fixed sleeve. An arc-shaped telescopic block is radially fixedly connected to the outer surface of the rotary air shaft. The arc-shaped telescopic block extends circumferentially relative to the outer edge of the rotary air shaft. An arc-shaped inner pressure chamber communicating with the pneumatic regulator is provided inside the arc-shaped telescopic block, and the pneumatic regulator is used to control the elongation and compression of the arc-shaped telescopic block.

[0010] The fixed sleeve is provided with an arc-shaped track groove corresponding to the arc-shaped telescopic block. A return spring is provided in the arc-shaped track groove. One end of the return spring is connected to the inner wall of the arc-shaped track groove, and the other end of the return spring is connected to the end of the arc-shaped telescopic block.

[0011] Preferably, the inner end of the rotating air shaft is fixedly connected to the valve stem, the rotating air shaft is used to control the swing of the valve stem, the interior of the rotating air shaft is provided with a cylindrical sealing cavity connected to the air pressure regulator, and the cylindrical sealing cavity is provided with a radial vent hole connected to the interior of the arc-shaped telescopic block. The technical solution adjusts the internal air pressure of the cylindrical sealing cavity through the air pressure regulator, and the cylindrical sealing cavity is connected to the internal air pressure of the arc-shaped telescopic block through the radial vent hole, thereby controlling the extension and contraction of the arc-shaped telescopic block.

[0012] Preferably, the arc-shaped telescopic block includes an arc-shaped main block and an arc-shaped sub-block located at one end of the arc-shaped main block, the arc-shaped main block is fixedly connected to the outer surface of the rotating air shaft, the arc-shaped main block is provided with the arc-shaped internal pressure chamber connected to the cylindrical sealing chamber, the arc-shaped main block and the arc-shaped sub-block are sealingly slidably matched, the arc-shaped sub-block is located at one end of the arc-shaped main block relative to the reset spring, the arc-shaped sub-block is adaptively connected to the reset spring, and when the arc-shaped internal pressure chamber is pressurized, the arc-shaped sub-block is relatively extended. The arc-shaped sub-block of this product can only have one side and must be extended relative to the spring side. If it is extended away from the spring side, it will drive the rotating air shaft to rotate when the arc-shaped sub-block is extended, thereby causing the swing leakage of the valve core assembly.

[0013] Preferably, the interior of the rotating air shaft is hollow, and the rotating air shaft is mainly composed of an annular inner column, an outer shaft cylinder and a plurality of circumferentially distributed partitions. The annular inner column is provided with an inner column cavity located in the center, and an outer ring cavity surrounding the inner column cavity is provided between the annular inner column and the outer shaft cylinder. The inner column cavity and the outer ring cavity are interconnected to form the cylindrical sealing cavity. A plurality of partitions are sealingly connected between the annular inner column and the outer shaft cylinder, and a plurality of partitions divide the outer ring cavity into a plurality of circumferentially distributed arc-shaped air cavities, wherein one arc-shaped air cavity is connected to the air pressure regulator and the arc-shaped inner pressure cavity.

[0014] Preferably, the plurality of arc-shaped air cavities include a first arc-shaped air cavity and a second arc-shaped air cavity which are sealed and isolated from each other, the first arc-shaped air cavity is connected to the arc-shaped internal pressure cavity and the inner column cavity, the air pressure regulator is a piston assembly, the piston assembly includes a piston head and a first piston rod fixed to each other, the piston head and the inner column cavity form a threaded piston match, and the first piston rod is provided with an outwardly protruding toggle ring on the outside. The user drives the piston assembly to perform piston movement in the inner column cavity by turning the toggle ring, thereby controlling the pressure of the inner column cavity, the first arc-shaped air cavity and the arc-shaped internal pressure cavity, and controlling the extension and contraction of the arc-shaped sub-block.

[0015] Preferably, a telescopic top position piece is provided on the surface of the outer shaft cylinder corresponding to the second arc-shaped air cavity, and an outer end of the telescopic top position piece is provided with an outer friction surface; an inner friction surface is provided on the hollow inner wall of the fixed sleeve, and when the second arc-shaped air cavity is inflated, the telescopic top position piece is pushed outward, and the outer friction surface and the inner friction surface are adapted and locked.

[0016] Preferably, the second arc-shaped air cavity is provided with an arc-shaped plug head that forms a piston fit therewith. The outer end of the arc-shaped plug head is connected to a second piston rod. The second piston rod is provided with a radial locking pin. The first piston rod is provided with a plurality of annular clamping grooves arranged in an array along the length of the first piston rod. The annular clamping grooves and the locking pin form a locking fit.

[0017] Beneficial effects: The user controls the adjustment of the air pressure in the arc-shaped expansion block, thereby controlling the extension and contraction of the arc-shaped expansion block. Since the arc length of the arc-shaped track groove is fixed, when the arc-shaped expansion block extends, it correspondingly compresses the return spring. As a result, the elastic pressure of the return spring on the arc-shaped expansion block increases, improving the pressure for the rotation of the rotary air shaft, so that a higher hydraulic pressure is required to drive the valve core assembly and the rotary air shaft to rotate relative to the fixed sleeve and the valve body to open. Therefore, the user of this application can directly adjust the air pressure in the arc-shaped expansion block through the air pressure regulator, thereby controlling the hydraulic pressure value required by the hydraulic valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic structural diagram of an embodiment.

[0019] Figure 2 is Figure 1 an enlarged schematic view of part A in

[0020] Figure 3 It is a schematic internal structure diagram of an embodiment.

[0021] Figure 4 is Figure 3 an enlarged schematic view of part B in

[0022] Figure 5 It is a sectional structure of an embodiment Figure 1 .

[0023] Figure 6 It is a sectional structure of an embodiment Figure 2 .

[0024] Figure 7 It is a sectional view of the adjustment mechanism of an embodiment.

[0025] Figure 8 It is a schematic structure of an embodiment Figure 2 .

[0026] Figure 9 is Figure 8 an enlarged schematic view of part C in

[0027] Figure numerals: 1. valve body; 2. valve stem; 3. circular valve disc; 4. rotating air shaft; 41. annular inner column; 42. outer shaft cylinder; 43. partition; 5. fixed sleeve; 6. arc-shaped telescopic block; 61. arc-shaped main block; 62. arc-shaped auxiliary block; 7. arc-shaped track groove; 8. return spring; 9. inner column cavity; 10. first arc-shaped air cavity; 11. second arc-shaped air cavity; 12. piston assembly; 121. piston head; 122. first piston rod; 123. toggle ring; 13. telescopic top position piece; 14. arc-shaped plug head; 15. second piston rod; 16. locking pin; 17. annular locking groove; 18. radial vent. DETAILED DESCRIPTION

[0028] The following is combined with Figure 1-9 The present invention is further illustrated with examples.

[0029] Embodiment: A controllable swing check valve comprises a valve body 1, a valve core assembly, and an adjustment mechanism. Figure 5-6 As shown, the valve body 1 is provided with a liquid inlet channel, a liquid outlet channel and a regulating chamber in the middle, and the regulating chamber is connected to the liquid inlet channel and the liquid outlet channel respectively. The valve core assembly includes a valve stem 2 and a circular valve flap 3 located at the lower end of the valve stem 2. The valve stem 2 is an arc-shaped rod body structure. The circular valve flap 3 is adapted to the liquid inlet channel and is used to control the opening and closing of the liquid inlet channel.

[0030] like Figure 2 As shown, the regulating mechanism includes a rotating air shaft 4 that is transmission-connected to the valve stem 2, a fixed sleeve 5 that is fixedly connected to the valve body 1, and an air pressure regulator for controlling the air pressure in the rotating air shaft 4. The rotating air shaft 4 is sleeved in the fixed sleeve 5, and an arc-shaped telescopic block 6 is radially fixedly connected to the outer surface of the rotating air shaft 4. The arc-shaped telescopic block 6 extends circumferentially relative to the outer edge of the rotating air shaft 4. An arc-shaped internal pressure chamber connected to the air pressure regulator is provided in the arc-shaped telescopic block 6, and the air pressure regulator is used to control the extension and compression of the arc-shaped telescopic block 6. The fixed sleeve 5 is provided with an arc-shaped track groove 7 corresponding to the arc-shaped telescopic block 6, and a reset spring 8 is provided in the arc-shaped track groove 7. One end of the reset spring 8 is connected to the inner wall of the arc-shaped track groove 7, and the other end of the reset spring 8 is connected to the end of the arc-shaped telescopic block 6.

[0031] The inner end of the rotating air shaft 4 is fixedly connected to the valve stem 2. The rotating air shaft 4 is used to control the swing of the valve stem 2. The interior of the rotating air shaft 4 is provided with a cylindrical sealed cavity connected to the air pressure regulator. The cylindrical sealed cavity is provided with a radial vent hole 18 connected to the interior of the arc-shaped telescopic block 6. The technical solution adjusts the internal air pressure of the cylindrical sealed cavity through the air pressure regulator. The cylindrical sealed cavity is connected to the internal air pressure of the arc-shaped telescopic block 6 through the radial vent hole 18, thereby controlling the extension and contraction of the arc-shaped telescopic block 6. The arc-shaped telescopic block 6 includes an arc-shaped main block 61 and an arc-shaped sub-block 62 located at one end of the arc-shaped main block 61. The arc-shaped main block 61 is fixedly connected to the outer surface of the rotating air shaft 4. The arc-shaped main block 61 is provided with the arc-shaped internal pressure chamber connected to the cylindrical sealing chamber. The arc-shaped main block 61 and the arc-shaped sub-block 62 are sealed and slidably matched. The arc-shaped sub-block 62 is located at one end of the arc-shaped main block 61 relative to the reset spring 8. The arc-shaped sub-block 62 is adaptively connected to the reset spring 8. When the arc-shaped internal pressure chamber is pressurized, the arc-shaped sub-block 62 relatively extends outward. The arc-shaped sub-block 62 of this product can only have one side and must extend outward relative to the spring side. If it extends outward away from the spring side, it will drive the rotating air shaft 4 to rotate when the arc-shaped sub-block 62 extends outward, thereby causing the swing leakage of the valve core assembly.

[0032] like Figure 7 As shown, the interior of the rotating air shaft 4 is hollow, and the rotating air shaft 4 is mainly composed of an annular inner column 41, an outer shaft cylinder 42 and a plurality of circumferentially distributed partitions 43. The annular inner column 41 is provided with an inner column cavity 9 located in the center, and an outer ring cavity surrounding the inner column cavity 9 is provided between the annular inner column 41 and the outer shaft cylinder 42. The inner column cavity 9 and the outer ring cavity are interconnected to form the cylindrical sealed cavity. The plurality of partitions 43 seal and connect the annular inner column 41 and the outer shaft cylinder 42, and the plurality of partitions 43 divide the outer ring cavity into a first arc-shaped air cavity 10 and three second arc-shaped air cavities 11 distributed circumferentially. The first arc-shaped air cavity 10 is connected to the arc-shaped internal pressure cavity and the inner column cavity 9, and the second arc-shaped air cavity 11 and the first arc-shaped air cavity 10 are sealed and isolated from each other.

[0033] The gas pressure regulator is Figure 9 The piston assembly 12 shown can also be an existing air pressure regulator device with a micro air pump or the like. The structure of the piston assembly 12 is simpler and easier to control, and there is no need to connect a corresponding power supply. The piston assembly 12 includes a piston head 121 and a first piston rod 122 fixed to each other. The piston head 121 and the inner column cavity 9 form a threaded piston fit, and the outer portion of the first piston rod 122 is provided with a toggle ring 123 protruding outward. The user drives the piston assembly 12 to perform piston movement in the inner column cavity 9 by rotating the toggle ring 123, thereby controlling the pressure of the inner column cavity 9, the first arc-shaped air cavity 10 and the arc-shaped inner pressure cavity, and controlling the extension and contraction of the arc-shaped auxiliary block 62.

[0034] The surface of the outer shaft cylinder 42 is provided with a plurality of circumferentially distributed telescopic top-positioning members 13, and each telescopic top-positioning member 13 corresponds to one of the second arc-shaped air cavities 11. The outer end of the telescopic top-positioning member 13 is provided with an outer friction surface; the inner wall of the hollow fixed sleeve 5 is provided with an inner friction surface. When the second arc-shaped air cavity 11 is inflated, the telescopic top-positioning member 13 is pushed outwards, and the outer friction surface is adapted and locked with the inner friction surface. The second arc-shaped air cavity 11 is provided with an arc-shaped plug 14 that forms a piston fit with it. The outer end of the arc-shaped plug 14 is connected to a second piston rod 15. The second piston rod 15 is provided with a radial locking pin 16. The first piston rod 122 is provided with a plurality of annular clamping grooves 17 arranged in an array along the length of the first piston rod 122, and the annular clamping grooves 17 and the locking pin 16 form a locking fit.

[0035] Operating principle: When the valve needs to be opened, it is necessary to drive the swing of the valve stem 2 by rotating the air shaft 4. At this time, the greater the force required for the rotation of the air shaft 4, the greater the hydraulic pressure required to realize the connection between the liquid inlet channel and the liquid outlet channel. The user controls the rotary piston assembly 12 to control the movement of the piston head 121 in the inner column cavity 9, and then controls the internal air pressure of the inner column cavity 9. The inner column cavity 9 is interconnected with the arc-shaped inner pressure cavity in the arc-shaped telescopic block 6. The change in the internal air pressure of the arc-shaped inner pressure cavity realizes the elongation and contraction of the arc-shaped sub-block 62 relative to the arc-shaped telescopic block 6. Since the arc length of the arc-shaped track groove 7 is fixed, when the arc-shaped telescopic block 6 elongates, it correspondingly compresses the return spring 8, and then the elastic pressure of the return spring 8 on the arc-shaped telescopic block 6 increases, increasing the pressure for the rotation of the air shaft 4, so that a higher hydraulic pressure is required to drive the valve core assembly and the air shaft 4 to rotate relative to the fixed sleeve 5 and the valve body 1 to open. Among them, in this application Figure 4 the piston assembly 12 is only for showing the corresponding structure, and the actual size is relatively longer.

[0036] In this application, when it is necessary to lock the position of the valve core assembly, the pressure of the arc-shaped plug 14 in the second arc-shaped air cavity 11 can be directly controlled to realize the control of the elongation and contraction of the telescopic top-positioning member 13. When the telescopic top-positioning member 13 elongates and abuts against the inner wall of the fixed sleeve 5, the position of the valve core assembly can be locked, and the swinging position of the valve stem 2 can be fixed.

[0037] Obviously, the above-mentioned embodiments of the present invention are only examples for explaining the present invention, and are not intended to limit the embodiments of the present invention. For those of ordinary skill in the art, other different forms of changes or modifications can be made on the basis of the above description. It is not necessary and impossible to list all the embodiments here. And these obvious changes or modifications derived from the essence of the present invention still fall within the protection scope of the present invention.

Claims

1. A controllable swing check valve, comprising a valve body (1), a valve core assembly, and an adjusting mechanism, wherein the valve body (1) is provided with a liquid inlet channel, a liquid outlet channel, and an adjusting chamber in the middle, wherein the adjusting chamber is connected to the liquid inlet channel and the liquid outlet channel respectively; the valve core assembly comprises a valve stem (2) and a circular valve flap (3) located at the lower end of the valve stem (2), wherein the valve stem (2) is an arc-shaped rod body structure, and the circular valve flap (3) is adapted to the liquid inlet channel, and the circular valve flap (3) is used to control the opening and closing of the liquid inlet channel, and is characterized in that: The regulating mechanism comprises a rotating air shaft (4) drivingly connected to the valve stem (2), a fixed sleeve (5) fixedly connected to the valve body (1), and an air pressure regulator for controlling the air pressure in the rotating air shaft (4); The rotating air shaft (4) is sleeved in the fixed sleeve (5), and an arc-shaped telescopic block (6) is radially fixedly connected to the outer surface of the rotating air shaft (4). The arc-shaped telescopic block (6) extends circumferentially relative to the outer edge of the rotating air shaft (4). An arc-shaped internal pressure chamber connected to an air pressure regulator is provided in the arc-shaped telescopic block (6), and the air pressure regulator is used to control the extension and compression of the arc-shaped telescopic block (6); The fixing sleeve (5) is provided with an arc-shaped track groove (7) corresponding to the arc-shaped telescopic block (6), and a return spring (8) is provided in the arc-shaped track groove (7), one end of the return spring (8) is connected to the inner wall of the arc-shaped track groove (7), and the other end of the return spring (8) is connected to the end of the arc-shaped telescopic block (6); The inner end of the rotating air shaft (4) is fixedly connected to the valve stem (2), and the rotating air shaft (4) is used to control the swing of the valve stem (2). The interior of the rotating air shaft (4) is provided with a cylindrical sealing cavity connected to the air pressure regulator, and the cylindrical sealing cavity is provided with a radial vent hole (18) connected to the interior of the arc-shaped telescopic block (6); The arc-shaped telescopic block (6) comprises an arc-shaped main block (61) and an arc-shaped auxiliary block (62) located at one end of the arc-shaped main block (61); the arc-shaped main block (61) is fixedly connected to the outer surface of the rotating air shaft (4); the arc-shaped main block (61) is provided with an arc-shaped internal pressure chamber connected to the cylindrical sealing chamber; the arc-shaped auxiliary block (62) is located at one end of the arc-shaped main block (61) opposite to the return spring (8); the arc-shaped auxiliary block (62) is adaptively connected to the return spring (8); when the arc-shaped internal pressure chamber is pressurized, the arc-shaped auxiliary block (62) extends relatively outward.

2. The controllable swing check valve according to claim 1, characterized in that: The interior of the rotating air shaft (4) is hollow. The rotating air shaft (4) is mainly composed of an annular inner column (41), an outer shaft cylinder (42) and a plurality of circumferentially distributed partitions (43). The annular inner column (41) is provided with an inner column cavity (9) located in the center. An outer ring cavity surrounding the inner column cavity (9) is provided between the annular inner column (41) and the outer shaft cylinder (42). The inner column cavity (9) and the outer ring cavity are interconnected to form the cylindrical sealed cavity. The plurality of partitions (43) seal the annular inner column (41) and the outer shaft cylinder (42). The plurality of partitions (43) divide the outer ring cavity into a plurality of circumferentially distributed arcuate air cavities, wherein one arcuate air cavity is connected to the air pressure regulator and the arcuate inner pressure cavity.

3. The controllable swing check valve according to claim 2, characterized in that: The plurality of arc-shaped air cavities include a first arc-shaped air cavity (10) and a second arc-shaped air cavity (11) which are sealed and isolated from each other. The first arc-shaped air cavity (10) is connected to the arc-shaped inner pressure cavity and the inner column cavity (9). The air pressure regulator is a piston assembly (12). The piston assembly (12) includes a piston head (121) and a first piston rod (122) which are fixed to each other. The piston head (121) and the inner column cavity (9) form a threaded piston. The first piston rod (122) is provided with an outwardly protruding toggle ring (123) on the outside.

4. The controllable swing check valve according to claim 3, characterized in that: A telescopic top member (13) is provided on the surface of the outer shaft cylinder (42) corresponding to the second arc-shaped air cavity (11), and an outer end of the telescopic top member (13) is provided with an outer friction surface; an inner friction surface is provided on the hollow inner wall of the fixed sleeve (5); when the second arc-shaped air cavity (11) is inflated, the telescopic top member (13) is pushed outward, and the outer friction surface is adapted and locked with the inner friction surface.

5. A controllable swing check valve according to claim 4, characterized in that: The second arc-shaped air cavity (11) is provided with an arc-shaped plug (14) which cooperates with the piston therewith; the outer end of the arc-shaped plug (14) is connected with a second piston rod (15); the second piston rod (15) is provided with a radial locking pin (16); the first piston rod (122) is provided with a plurality of annular locking grooves (17) distributed in an array along the length of the first piston rod (122); the annular locking grooves (17) and the locking pin (16) form a locking cooperation.

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