Swing check valve with water balance structure

Abstract

The utility model discloses a swing check valve with a water balance structure, which belongs to the field of check valves and comprises a three-way valve body, one side of the three-way valve body is provided with a water inlet, the other side of the three-way valve body is provided with a water outlet, and the top of the three-way valve body is provided with a sealing cover plate through a bolt. A mounting plate is arranged on the side, close to the water inlet, of the upper portion of the inner wall of the three-way valve body, a fixed U-shaped frame is downwards mounted on the surface of the mounting plate, the fixed U-shaped frame is opened downwards, a rotating shaft is rotationally mounted at the opening of the fixed U-shaped frame, and a swing plate is downwards arranged on the surface of the rotating shaft; a valve clack is installed on the side, close to the water inlet, of the bottom of the swing plate, the end face of the valve clack is matched with the section of an internal flow channel of the water inlet, a balance weight block corresponding to the valve clack is arranged on the outer side of the valve body, the balance weight block can rotate along with the valve clack, and the position of the valve clack can be independently adjusted. And the pressure required for opening the valve clack is controlled through the position of the balancing weight relative to the valve clack.

Description

Technical Field

[0001] The utility model relates to the field of check valves, and more specifically, to a swing check valve with a water balance structure. Background Art

[0002] A swing check valve primarily consists of a valve body, bonnet, and disc. The disc rotates around an axis, like a door that can be opened in one direction. When the medium flows in the normal direction, the force of the medium pushes the disc away from the valve seat, opening the valve and allowing the medium to pass through. However, when the medium flows in the reverse direction, the disc, under the influence of its own gravity and the reverse flow of the medium, quickly closes and presses against the valve seat, preventing the medium from flowing in the opposite direction. Therefore, the opening force of a swing check valve is primarily determined by the weight of the disc itself.

[0003] When a check valve passes through the water in the forward direction, the weight of the disc creates a certain amount of resistance to the water flow, which affects the water flow rate. If a system has multiple check valves, the impact of these check valve resistances on the water flow distribution in each branch must be considered when performing hydraulic calculations to achieve system water balance. However, existing check valves cannot adjust the amount of water flow resistance, which affects the water balance of the entire system. Utility Model Content

[0004] 1. Technical problems to be solved

[0005] In view of the problems existing in the prior art, the purpose of the present invention is to provide a swing check valve with a water-balanced structure, which can adjust the pressure when the valve disc opens.

[0006] 2. Technical solution

[0007] In order to solve the above problems, the present invention adopts the following technical solutions.

[0008] A water-balancing swing check valve comprises a three-way valve body, one side of the three-way valve body is provided with a water inlet, and the other side of the three-way valve body is provided with a water outlet, a sealing cover plate is installed on the top of the three-way valve body by bolts, a mounting plate is provided on the upper side of the inner wall of the three-way valve body near the water inlet, a fixed U-shaped frame is downwardly mounted on the surface of the mounting plate, the fixed U-shaped frame is open downwardly, a rotating shaft is rotatably mounted on the open end of the fixed U-shaped frame, a swing plate is provided downwardly on the surface of the swing plate, and a side of the bottom of the swing plate near the water inlet is provided with a A valve disc is installed, and the end face of the valve disc is adapted to the cross-section of the internal flow channel of the water inlet. Mounting protrusions are symmetrically provided on both sides of the interior of the three-way valve body. The rotating shaft is rotatably placed between the two mounting protrusions. A docking square hole is opened at one end of the rotating shaft, and a linkage shaft is rotatably passed through the inner side of one of the mounting protrusions. A docking square head is provided at one end of the linkage shaft, and the docking square head is adapted to the internal size of the docking square hole. A turntable is rotatably installed at the other end of the linkage shaft, and the turntable is placed outside the three-way valve body. A counterweight is installed on the surface of the turntable.

[0009] Furthermore, a connecting rod is vertically provided on one side of the arc surface of the turntable, the counterweight is installed at the bottom of the connecting rod, and a nut for fixing the counterweight is screwed on the surface of the connecting rod.

[0010] Furthermore, the connecting rod corresponds to the swing plate.

[0011] Furthermore, a surface of one side of the turntable facing away from the connecting rod is evenly provided with protruding teeth with the linkage shaft as the center, and a support plate is provided on one end of the linkage shaft surface close to the turntable.

[0012] Furthermore, the support plate structure is in an L-shaped row, and a control screw is vertically screwed through the horizontal surface of the support plate, and the control screw is vertically distributed to the axis of the linkage shaft.

[0013] Furthermore, an extrusion plate is provided at one end of the control screw, and grooves matching the convex teeth are evenly opened on the surface of the extrusion plate.

[0014] 3. Beneficial effects

[0015] Compared with the existing technology, the advantages of the present invention are: the present invention provides a swing check valve with a water-balanced structure, in which a counterweight corresponding to the valve disc is arranged on the outside of the valve body, and this counterweight can rotate together with the valve disc, and the position of the valve disc can also be adjusted separately, so as to control the pressure required to open the valve disc by the position of the counterweight relative to the valve disc. When the valve plate is in a closed state, if the counterweight is placed on the front side, the water pressure required to open the valve disc is relatively small, otherwise a larger water pressure is required to open the valve disc. By adjusting the position of the counterweight, the resistance of a single check valve to the water flow can be controlled, thereby realizing the adjustment of the water balance of the overall system. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the three-dimensional structure of the valve body of the present utility model;

[0017] Figure 2 This is a schematic diagram of the cross-sectional internal structure of the valve body of the present invention;

[0018] Figure 3 This is a schematic diagram of the valve disc installation structure of the utility model;

[0019] Figure 4 This is a schematic diagram of the installation structure of the linkage shaft and counterweight block of the utility model;

[0020] Figure 5 For the utility model Figure 4 Schematic diagram of the enlarged structure of area A.

[0021] Explanation of the numbers in the figure: 1. Three-way valve body; 101. Mounting protrusion; 102. Mounting plate; 2. Water inlet; 3. Water outlet; 4. Fixed U-shaped frame; 5. Rotating shaft; 6. Docking square hole; 7. Swinging plate; 8. Valve disc; 9. Sealing cover plate; 10. Linkage shaft; 11. Docking square head; 12. Turntable; 13. Protruding teeth; 14. Connecting rod; 15. Counterweight; 16. Support plate; 17. Control screw; 18. Extrusion plate; 19. Groove. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention; it is obvious that the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0023] Example:

[0024] See also Figure 1-Figure 4As shown, a water-balanced swing check valve comprises a three-way valve body 1, one side of the three-way valve body 1 is provided with a water inlet 2, and the other side of the three-way valve body 1 is provided with a water outlet 3. A sealing cover plate 9 is installed on the top of the three-way valve body 1 by bolts, so that the liquid passing through the valve body can only enter the water inlet 2 and flow out of the water outlet 3, and the rest remain sealed. A mounting plate 102 is provided on the side above the inner wall of the three-way valve body 1 near the water inlet 2, and a fixed U-shaped frame 4 is mounted downward on the surface of the mounting plate 102. The fixed U-shaped frame 4 is open downward, and a rotating shaft 5 is rotatably mounted at the open end of the fixed U-shaped frame 4. A swing plate 7 is provided downward on the surface of the swing plate 5, and a valve disc 8 is installed on the side of the bottom of the swing plate 7 near the water inlet 2. The end face of the valve disc 8 is adapted to the cross section of the internal flow channel of the water inlet 2, and the swing When the plate 7 is vertically downward, the valve disc 8 seals the flow channel, so that the valve body is closed. When water flows in, the valve disc 8 can be pushed to open. Mounting protrusions 101 are symmetrically provided on both sides of the three-way valve body 1. The rotating shaft 5 is rotated and placed between the two mounting protrusions 101. A docking square hole 6 is provided at one end of the rotating shaft 5. A linkage shaft 10 is rotated through the inner side of one of the mounting protrusions 101. A docking square head 11 is provided at one end of the linkage shaft 10. The docking square head 11 is adapted to the internal size of the docking square hole 6 so that the linkage shaft 10 and the swing plate 7 can rotate together after being installed in place. Both mounting protrusions 101 can be installed. The linkage shaft 10 can adjust the direction in which the counterweight block 15 is placed on the valve body according to actual usage requirements, and the other mounting protrusion 101 can be blocked and sealed by a plug.

[0025] refer to Figure 2 and Figure 4 As shown, a turntable 12 is rotatably mounted on the other end of the linkage shaft 10. The turntable 12 is placed outside the three-way valve body 1. A counterweight 15 is mounted on the surface of the turntable 12. A connecting rod 14 is vertically arranged on one side of the arc surface of the turntable 12. The counterweight 15 is mounted on the bottom of the connecting rod 14. A nut for fixing the counterweight 15 is screwed on the surface of the connecting rod 14. The connecting rod 14 is fixed to the turntable 12, so that the gravity of the counterweight 15 can act on the turntable 12.

[0026] The connecting rod 14 corresponds to the swing plate 7. When the connecting rod 14 is parallel to the swing plate 7, the counterweight 15 and the valve disc 8 are both vertically downward, and the valve is closed. To open the valve, water pressure is needed to push open the valve disc 8 and the weight of the counterweight 15, while maintaining resistance to the water flow. Placing the counterweight 15 at the rear can also increase resistance.

[0027] When the counterweight 15 is placed at the front side, the counterweight 15 has a downward force, which in turn makes the linkage shaft 10 have a certain torque. At this time, the torque of the counterweight 15 can reduce the gravity of the valve disc 8. At this time, the pressure required to open the valve is larger, and the resistance to water flow is larger.

[0028] refer to Figure 4 and Figure 5As shown, the surface of the turntable 12 on one side away from the connecting rod 14 is evenly provided with convex teeth 13 with the linkage shaft 10 as the center. A support plate 16 is provided on the surface of the linkage shaft 10 close to the turntable 12. The support plate 16 structure is L-shaped, and a control screw 17 is vertically screwed through the horizontal plane of the support plate 16. The control screw 17 is perpendicular to the axis of the linkage shaft 10. An extrusion plate 18 is provided at one end of the control screw 17. The surface of the extrusion plate 18 is evenly provided with grooves 19 that are compatible with the convex teeth 13. By controlling the rotation of the screw 17 to control the distance between the extrusion plate 18 and the turntable 12, and then controlling whether relative rotation can occur between the turntable 12 and the linkage shaft 10, the fixation of the counterweight block 15 after position adjustment is achieved.

[0029] The distribution range of the protruding teeth 13 is larger than 180°.

[0030] Working principle: flanges are provided at both ends of the three-way valve body 1, which are installed on the pipeline through the flanges and kept sealed by the sealing cover plate 9. After the water flows in through the water inlet 2, the valve disc 8 will be pushed open, causing the swing plate 7 to rotate at a certain angle, and then flow out through the water outlet 3. On the contrary, due to the deadweight of the valve disc 8, it is in a vertical sealing state to prevent the internal liquid from flowing back. When the valve disc 8 is opened by water pressure, the linkage shaft 10 is driven to rotate through the cooperation of the docking square hole 6 and the docking square head 11, and the turntable 12 and the linkage shaft 10 can pass through. The control screw 17 is kept fixed by screwing. After the control screw 17 is loosened, the turntable 12 can be rotated to adjust the angle of the connecting rod 14 relative to the swing plate 7, and then locked and fixed by the control screw 17. The influence of the deadweight of the counterweight block 15 on the deadweight of the valve flap 8 is then adjusted. When the valve flap 8 is closed, the connecting rod 14 is adjusted to be rotated and fixed in the direction of the water inlet 2. At this time, a small pressure is required to open the valve flap 8. On the contrary, when the connecting rod 14 is vertical or rotated and fixed in the direction of the water outlet 3, a larger water pressure is required to open the valve flap 8.

[0031] The above description is merely a preferred embodiment of the present invention; however, the scope of protection of the present invention is not limited thereto. Any person skilled in the art who, within the technical scope disclosed in the present invention, makes equivalent substitutions or modifications based on the technical solutions and improved concepts of the present invention shall be covered by the scope of protection of the present invention.

Claims

1. A water-balanced swing check valve, comprising a three-way valve body (1), wherein one side of the three-way valve body (1) is provided with a water inlet (2), and the other side of the three-way valve body (1) is provided with a water outlet (3), and a sealing cover plate (9) is mounted on the top of the three-way valve body (1) by bolts, characterized in that: A mounting plate (102) is provided on the side of the inner wall of the three-way valve body (1) close to the water inlet (2), a fixed U-shaped frame (4) is mounted downward on the surface of the mounting plate (102), the fixed U-shaped frame (4) is open downward, a rotating shaft (5) is rotatably mounted at the open portion of the fixed U-shaped frame (4), a swing plate (7) is provided on the surface of the rotating shaft (5), a valve flap (8) is mounted on the bottom of the swing plate (7) close to the water inlet (2), the end face of the valve flap (8) is adapted to the cross section of the flow channel inside the water inlet (2), and mounting plates are symmetrically provided on both sides of the interior of the three-way valve body (1). The mounting protrusions (101) are installed, and the rotating shaft (5) is rotatably placed between the two mounting protrusions (101). A docking square hole (6) is opened at one end of the rotating shaft (5). A linkage shaft (10) is rotatably passed through the inner side of one of the mounting protrusions (101). A docking square head (11) is provided at one end of the linkage shaft (10). The docking square head (11) is adapted to the inner size of the docking square hole (6). A turntable (12) is rotatably installed at the other end of the linkage shaft (10). The turntable (12) is placed outside the three-way valve body (1), and a counterweight (15) is installed on the surface of the turntable (12).

2. The water-balanced swing check valve according to claim 1, characterized in that: A connecting rod (14) is vertically arranged on one side of the arc surface of the turntable (12), the counterweight (15) is installed at the bottom of the connecting rod (14), and a nut for fixing the counterweight (15) is screwed on the surface of the connecting rod (14).

3. The water-balanced swing check valve according to claim 2, characterized in that: The connecting rod (14) corresponds to the swing plate (7).

4. The water-balanced swing check valve according to claim 2, characterized in that: The surface of the rotating disk (12) on one side away from the connecting rod (14) is evenly provided with protruding teeth (13) with the linkage shaft (10) as the center of the circle, and a support plate (16) is provided on the surface of the linkage shaft (10) at one end close to the rotating disk (12).

5. The water-balanced swing check valve according to claim 4, characterized in that: The support plate (16) is structured in an L-shaped row. A control screw (17) is vertically screwed and penetrates the horizontal surface of the support plate (16). The control screw (17) is vertically distributed with the axis of the linkage shaft (10).

6. The water-balanced swing check valve according to claim 5, characterized in that: An extrusion plate (18) is provided at one end of the control screw (17), and grooves (19) matching the convex teeth (13) are evenly formed on the surface of the extrusion plate (18).

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