Double-check-valve mechanism capable of improving damping

Abstract

The utility model relates to the field of coking production devices, and discloses a double check valve mechanism capable of improving damping, which comprises a valve body, the upper end and the lower end in the valve body are fixedly connected with a connecting shaft, the periphery of the connecting shaft is rotatably connected with two valve clacks, and buffer components are arranged in the close sides of the two valve clacks. An adjusting groove is formed in the lower portion of the inner wall of the valve body, and two adjusting rods are arranged in the adjusting groove. According to the utility model, the rotating rod, the bidirectional threaded rod, the adjusting rod, the bevel gear and the fixed block are matched with each other, so that the torque of the torsion spring is adjusted, when the valve clacks are in an open state, if the pressure disappears, the two valve clacks in the valve body can be quickly closed due to an instant pressure difference, and when the two valve clacks are attached, the valve clacks can be quickly closed. The buffer assembly in the valve body can weaken impact force carried when the valve body and the valve body are closed, and the situation that the valve body is separated from a connecting pipeline due to the impact force is avoided.

Description

Technical Field

[0001] The utility model relates to the field of coking production equipment, in particular to a double check valve mechanism capable of improving damping. Background Art

[0002] A double check valve or double check assembly (DCA) is a backflow prevention device designed to protect the water supply from contamination and is different from the two-way check valves (sometimes incorrectly referred to as double check valves) used in heavy truck air brake systems that select from the highest pressure source.

[0003] During the use of the double check valve, if the closing speed of the double check valve is too fast without sufficient damping effect, water hammer may occur when the medium is closed quickly. Water hammer is a pressure shock wave generated when the medium is closed quickly, which may damage the pipeline or related equipment, and even cause the system to rupture or leak. In view of this technical problem, the present application proposes a double check valve mechanism that can improve damping. Utility Model Content

[0004] The purpose of the utility model is to solve the shortcomings existing in the prior art, and to propose a double check valve mechanism with improved damping. Through the mutual cooperation between the rotating rod, the two-way threaded rod, the adjusting rod, the bevel gear and the fixed block, the torque of the torsion spring itself can be adjusted, so that when the damping of the valve needs to be adjusted, it is no longer necessary to dismantle the entire valve to replace the damping. When the valve flap is in an open state, if the pressure disappears, the two valve flaps inside the valve body will close quickly due to the instantaneous pressure difference. When the two are fitted together, the internal buffer component will weaken the impact force carried by the two when they are closed, thereby preventing the valve body from being separated from the connecting pipe due to the impact force.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A double check valve mechanism with improved damping comprises a valve body, wherein the upper and lower ends of the valve body are fixedly connected with a connecting shaft, the outer periphery of the connecting shaft is rotatably connected with two valve flaps, a buffer assembly is arranged inside the two valve flaps on the adjacent sides, an adjustment groove is opened below the inner wall of the valve body, two adjustment rods are arranged inside the adjustment groove, the outer peripheries of the two adjustment rods are fixedly connected with fixing blocks, the front ends of the two fixing blocks are connected to the valve flaps through torsion springs, and the top of the adjustment rod is connected with a rotating rod through an adjustment assembly.

[0007] Furthermore, the buffer assembly includes a fixed rod fixedly connected to the inside of the valve flap and a transmission plate slidably connected to the left side of the inside of the valve flap, two pressure plates are slidably connected to the outer periphery of the fixed rod, the two pressure plates are connected by a buffer spring, and the two pressure plates are fixedly connected to one side close to the transmission plate with a connecting piece, and the connecting piece on the right side of the transmission plate is connected to the connecting piece on the left side of the pressure plate through a connecting rod.

[0008] Furthermore, the adjustment assembly includes a bidirectional threaded rod connected to the internal threads of the upper ends of the two adjustment rods, and the outer periphery of the middle end of the bidirectional threaded rod and the bottom of the rotating rod are fixedly connected with bevel gears, and the two bevel gears are meshedly connected.

[0009] Furthermore, an adjustment box is fixedly connected above the inner wall of the valve body, a sliding groove is provided at the bottom of the adjustment box, and the two adjustment rods are slidably connected inside the sliding groove.

[0010] Furthermore, a clamping groove is provided on one side close to the rear end of the two valve flaps, and the two torsion springs are arranged inside the clamping groove.

[0011] Furthermore, the torsion spring is sleeved on the outer circumference of the connecting shaft.

[0012] Furthermore, a plurality of mounting holes are provided at both the front and rear ends of the valve body.

[0013] The utility model has the following beneficial effects:

[0014] 1. In the utility model, through the mutual cooperation among the rotating rod, the bidirectional threaded rod, the adjusting rod, the bevel gear and the fixed block, the two bevel gears inside the adjusting box are driven to rotate by rotating the rotating rod, so that the bidirectional threaded rod rotates to adjust the distance between the two adjusting rods thereon, and the torsion spring connected to the adjusting rod through the fixed block is tightened, so as to adjust the torque of the torsion spring itself, thereby changing the ability of the valve disc to withstand pressure, so that when the valve needs to adjust the damping, it is no longer necessary to dismantle the valve as a whole to replace the damping.

[0015] 2. In the utility model, through the mutual cooperation between the transmission plate, the fixing rod, the buffer spring, the pressure plate, the connecting rod and the connecting piece, when the valve flap is in the open state, if the pressure disappears, the two valve flaps inside the valve body will quickly close due to the instantaneous pressure difference. When the two are in contact, the internal buffer component will weaken the impact force carried by the two when they are closed, thereby preventing the valve body from being separated from the connecting pipe due to the impact force. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A three-dimensional diagram of a double check valve mechanism capable of improving damping proposed by the utility model;

[0017] Figure 2This is a schematic diagram of the structure of a buffer assembly of a double check valve mechanism capable of improving damping proposed by the utility model;

[0018] Figure 3 A schematic diagram of a damping structure of a double check valve mechanism capable of improving damping proposed by the utility model;

[0019] Figure 4 This is a schematic diagram of the structure of an adjustment component of a double check valve mechanism capable of improving damping proposed by the utility model.

[0020] Legend:

[0021] 1. Valve body; 2. Valve disc; 3. Rotating rod; 4. Transmission plate; 5. Fixed rod; 6. Buffer spring; 7. Pressure plate; 8. Connecting rod; 9. Connecting piece; 10. Adjusting box; 11. Connecting shaft; 12. Torsion spring; 13. Bidirectional threaded rod; 14. Adjusting rod; 15. Fixed block; 16. Bevel gear. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0023] Reference Figure 1 , Figure 3, the utility model provides an embodiment: a double check valve mechanism that can improve damping, including a valve body 1, the upper and lower ends of the valve body 1 are fixedly connected with a connecting shaft 11, the outer periphery of the connecting shaft 11 is rotatably connected to two valve discs 2, the two valve discs 2 are slidably connected to the inner sides thereof with a transmission plate 4, the two transmission plates 4 are fixedly connected to two connecting pieces 9 on the separated sides, the connecting piece 9 is connected to the connecting piece 9 on the pressure plate 7 through a connecting rod 8, and the two pressure plates 7 are connected to a buffer spring 6 at one end thereof, and the valve body 1 is prevented from being separated from the connecting pipe due to impact force through the mutual cooperation between the transmission plate 4, the fixing rod 5, the buffer spring 6, the pressure plate 7, the connecting rod 8 and the connecting piece 9, an adjusting groove is provided at the lower inner wall of the valve body 1, two adjusting rods 14 are arranged inside the adjusting groove, the outer peripheries of the two adjusting rods 14 are fixedly connected with fixing blocks 15, the front ends of the two fixing blocks 15 are connected to the valve disc 2 through a torsion spring 12, the top of the adjusting rod 14 is threadedly connected with a bidirectional threaded rod 13, and the bevel gear 16 on the outer periphery of the middle end of the rotating rod 3 is connected to the rotating rod 3 The bevel gears 16 on the valve body 1 are meshed, and through the mutual cooperation between the rotating rod 3, the two-way threaded rod 13, the adjusting rod 14, the bevel gears 16 and the fixed block 15, the two bevel gears 16 inside the adjusting box 10 are driven to rotate by rotating the rotating rod 3, so that the two-way threaded rod 13 rotates to adjust the spacing between the two adjusting rods 14 thereon, and the torsion spring 12 connected to the adjusting rod 14 through the fixed block 15 is tightened, so as to adjust the torque of the torsion spring 12 itself, thereby changing the ability of the valve disc 2 to withstand pressure, so that when the valve needs to adjust the damping, it is no longer necessary to dismantle the entire valve disc 2 to replace the damping. An adjusting box 10 is fixedly connected to the upper inner wall of the valve body 1, and a sliding groove is provided at the bottom of the adjusting box 10. The two adjusting rods 14 are slidably connected to the inside of the sliding groove. A clamping groove is provided on one side close to the rear end of the two valve discs 2, and the two torsion springs 12 are arranged inside the clamping groove. The torsion spring 12 is sleeved on the outer periphery of the connecting shaft 11, and a plurality of mounting holes are provided at both ends of the valve body 1 to facilitate connecting the valve body 1 to the connecting pipe.

[0024] Reference Figure 2 , wherein a fixed rod 5 fixedly connected inside the valve disc 2 and a transmission plate 4 slidably connected to the left side of the valve disc 2, two pressure plates 7 are slidably connected to the outer periphery of the fixed rod 5, and the two pressure plates 7 are connected by a buffer spring 6. The two pressure plates 7 are fixedly connected to the side close to the transmission plate 4 with a connecting piece 9, and the connecting piece 9 on the right side of the transmission plate 4 is connected to the connecting piece 9 on the left side of the pressure plate 7 through a connecting rod 8. When the adjacent sides of the two valve discs 2 collide with each other, the transmission plate 4 thereon will be compressed inwardly due to the impact force, and the connecting rod 8 connected to the connecting piece 9 on the transmission plate 4 will also move inward, squeezing the pressure plate 7 on the fixed rod 5 at the same time, causing the buffer spring 6 connected to the pressure plate 7 to deform, thereby alleviating the impact force brought by the valve disc 2 and avoiding the water hammer phenomenon in the pipeline from damaging the internal structure of the valve body 1.

[0025] Reference Figure 4The upper ends of the two adjusting rods 14 are internally threadedly connected to the bidirectional threaded rod 13, and the outer periphery of the middle end of the bidirectional threaded rod 13 and the bottom of the rotating rod 3 are fixedly connected with a bevel gear 16. The two bevel gears 16 are meshingly connected. By rotating the rotating rod 3 at the top of the valve body 1, the bevel gear 16 below it is driven to rotate, so that the bidirectional threaded rod 13 and the bevel gear 16 thereon rotate together, so that the spacing between the two adjusting rods 14 on the bidirectional threaded rod 13 can be adjusted, and at the same time, the torque of the torsion spring 12 itself connected to it through the fixed block 15 is adjusted.

[0026] Working principle: By rotating the rotating rod 3 on the top of the valve body 1, the bevel gear 16 below it is driven to rotate, so that the two-way threaded rod 13 and the bevel gear 16 on it rotate together, so that the spacing between the two adjusting rods 14 on the two-way threaded rod 13 can be adjusted, and at the same time, the torque of the torsion spring 12 connected to it through the fixed block 15 is adjusted. After adjusting it to the required resistance, the valve body 1 is installed on the connecting pipe through the mounting hole on the valve body 1 to use the valve. When the pressure in front of the valve disc 2 disappears, the torsion spring 12 behind it will merge the two valve discs 2 together. When the adjacent sides of the two valve discs 2 collide with each other, the transmission plate 4 on it will be compressed inwardly due to the impact force, and the connecting rod 8 connected to the connecting piece 9 on the transmission plate 4 will also move inward, squeezing the pressure plate 7 on the fixed rod 5 at the same time, causing the buffer spring 6 connected to the pressure plate 7 to deform, thereby alleviating the impact force brought by the valve disc 2 and avoiding the water hammer phenomenon in the pipeline from damaging the internal structure of the valve body 1.

[0027] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A double check valve mechanism capable of improving damping, comprising a valve body (1), characterized in that: The valve body (1) is fixedly connected to a connecting shaft (11) at both upper and lower ends. The connecting shaft (11) is rotatably connected to two valve flaps (2). A buffer assembly is provided inside the adjacent side of the two valve flaps (2). An adjustment groove is provided below the inner wall of the valve body (1). Two adjustment rods (14) are provided inside the adjustment groove. The outer circumferences of the two adjustment rods (14) are fixedly connected to fixed blocks (15). The front ends of the two fixed blocks (15) are connected to the valve flaps (2) via torsion springs (12). The top of the adjustment rod (14) is connected to a rotating rod (3) via an adjustment assembly.

2. A double check valve mechanism capable of improving damping according to claim 1, characterized in that: The buffer assembly comprises a fixed rod (5) fixedly connected to the inside of the valve flap (2) and a transmission plate (4) slidably connected to the left side of the inside of the valve flap (2); two pressure plates (7) are slidably connected to the outer periphery of the fixed rod (5); the two pressure plates (7) are connected via a buffer spring (6); the two pressure plates (7) are fixedly connected to a connecting piece (9) on one side close to the transmission plate (4); the connecting piece (9) on the right side of the transmission plate (4) is connected to the connecting piece (9) on the left side of the pressure plate (7) via a connecting rod (8).

3. A double check valve mechanism capable of improving damping according to claim 1, characterized in that: The adjustment assembly comprises a bidirectional threaded rod (13) which is internally threadedly connected to the upper ends of the two adjustment rods (14); a bevel gear (16) is fixedly connected to the outer periphery of the middle end of the bidirectional threaded rod (13) and the bottom of the rotating rod (3); and the two bevel gears (16) are meshingly connected.

4. A double check valve mechanism capable of improving damping according to claim 1, characterized in that: An adjustment box (10) is fixedly connected to the upper inner wall of the valve body (1), a sliding groove is provided at the bottom of the adjustment box (10), and the two adjustment rods (14) are slidably connected inside the sliding groove.

5. A double check valve mechanism capable of improving damping according to claim 1, characterized in that: A clamping groove is provided on one side adjacent to the rear ends of the two valve flaps (2), and the two torsion springs (12) are arranged inside the clamping groove.

6. A double check valve mechanism capable of improving damping according to claim 1, characterized in that: The torsion spring (12) is sleeved on the outer circumference of the connecting shaft (11).

7. A double check valve mechanism capable of improving damping according to claim 1, characterized in that: The valve body (1) is provided with a plurality of mounting holes at both the front and rear ends.

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