Eccentric reducing check valve

Abstract

The utility model relates to an eccentric reducing check valve which comprises a valve body, a valve seat and a valve clack, and the valve seat is arranged in a radial annular step between an inlet pipeline and an outlet pipeline of the valve body. The valve is characterized in that an inlet pipeline is of a variable-diameter eccentric structure composed of a small-diameter pipeline, an expanded-diameter pipeline and a large-diameter pipeline, the inlet end of the valve body can be directly connected with a water pump outlet pipeline, and pipeline installation parts are reduced; the valve clack is installed on a radial positioning shaft in an outlet pipeline of the valve body through a torsion spring, when a medium passes through a variable-diameter eccentric flow channel of an inlet pipeline, thrust generated on the lower portion of the valve clack is larger than that generated on the upper portion of the valve clack, when the valve clack is pushed to move, the valve clack is rotated and opened clockwise, and when inlet medium pressure disappears, torsion of the torsion spring enables the valve clack to rotate and reset. And the valve clack is tightly pressed by reverse medium pressure and elastic force of the torsional spring to be in sealing fit with the valve seat. The product has the advantages of simple structure, convenience in installation, low installation cost and the like.

Description

Technical Field

[0001] The utility model belongs to the field of valves, and in particular relates to a check valve. The utility model is suitable for preventing medium backflow at the outlet of a high-pressure water pump, and protecting the high-pressure water pump equipment and environmental safety. Background Art

[0002] In the water pump water supply system, due to the flow characteristics, the water pump outlet and the pipeline system are generally connected through a reducer, and the reducer is short. When installing other valves, the overall length and space are limited, and valves cannot be installed on it. In order to prevent the medium from flowing back when the high-pressure water pump stops, generating a large water hammer pressure, causing damage to the water pump and pipeline and causing an accident, a check valve needs to be installed between the reducer and the pipeline to achieve the purpose of protecting the safety of the water pump. At present, the check valve used at the water pump outlet generally adopts a swing check valve or a butterfly check valve, which uses the positive medium pressure to push the valve disc to open and the reverse medium pressure to push the valve disc to close. In order to prevent water hammer from damaging the pipeline system equipment during the closing process, the existing check valve needs to be equipped with a fast closing and slow closing device, which can only be used in medium and low pressure systems. The high-pressure valve has a long structure length and limited space, and the structure is complex and the cost is high. In addition, a straight pipe section needs to be installed between the check valve and the water pump outlet, which increases the equipment installation space, installation cost and installation process, and increases the leakage point. Due to vibration and thermal expansion and contraction, medium leakage may occur, thereby increasing the safety risks of personnel, equipment and the environment. Utility Model Content

[0003] The purpose of the utility model is to provide an eccentric reducer check valve which integrates a reducer joint and a check valve in order to address the shortcomings of the prior art. The product has a simple structure and low cost, can greatly reduce the installation cost of system equipment, simplify the installation process, and improve the safety of water pumps, pipeline equipment and the environment.

[0004] The technical solution to achieve the purpose of this utility model is:

[0005] An eccentric variable-diameter check valve comprises a valve body, a valve seat and a valve disc, wherein the valve seat is arranged in a radial annular step between an inlet pipe and an outlet pipe of the valve body; the inlet pipe is characterized in that: the inlet pipe is composed of a small-diameter pipe, an expanded-diameter pipe and a large-diameter pipe to form a variable-diameter eccentric structure, the flow channel diameter of the small-diameter pipe is equal to the flow channel diameter of the water pump outlet pipe, and the two are connected to each other through a flange, the flow channel of the expanded-diameter pipe has a conical surface structure at the upper part, and a cylindrical surface structure at the lower part, forming an eccentric structure of the center line of the large-diameter pipe and the center line of the small-diameter pipe; the valve disc is installed on a radial positioning shaft in the outlet pipe through a torsion spring, the torsion spring strengthens the torsion force when the valve disc rotates clockwise, and an axial gap is provided between the back of the valve disc sealing surface and the radial positioning shaft, and the axial gap is at least equal to the radial distance between the contact surface of the valve disc and the valve seat.

[0006] Preferably, a positioning device is provided between the valve disc and the radial positioning shaft, the positioning device being composed of two connecting lugs fixed on the back of the valve disc and interconnected with the outer cylindrical surfaces at both ends of the radial positioning shaft; the two connecting lugs have U-shaped connecting holes, the open ends of the U-shaped connecting holes are welded to the two sides of the radial arc groove on the back of the valve disc, the diameters of the radial arc groove and the arc of the U-shaped connecting hole are equal to the diameter of the radial positioning shaft, and the maximum distance between the arc of the U-shaped connecting hole and the radial arc groove on the back of the valve disc is at least equal to the sum of the diameter of the radial positioning shaft and the axial clearance; an axial limiting device is provided between the outer end surfaces of the two connecting lugs and the radial positioning shaft.

[0007] Preferably, a conical slope is provided at the lower part of the large diameter pipeline, which is upward along the flow direction of the medium.

[0008] Preferably, a sewage monitoring pipe is provided on the upper portion of the large diameter pipeline.

[0009] Compared with the prior art, the utility model has the following beneficial effects: the valve body inlet pipe adopts a variable diameter eccentric structure design, the valve body inlet end can be directly connected to the water pump outlet pipe, the valve does not need to be connected to the water pump through an expansion pipe, and the pipeline installation components are reduced; the valve disc is installed on the radial positioning shaft in the valve body outlet pipe by a torsion spring, and when the medium passes through the variable diameter eccentric flow channel of the inlet pipe, the thrust generated on the lower part of the valve disc is greater than the upper part, and when the valve disc is pushed to move, the valve disc rotates clockwise to open, and when the inlet medium pressure disappears, the torsion spring torsion forces the valve disc to rotate and reset, and the reverse medium pressure and the torsion spring elastic force press the valve disc to seal with the valve seat. It has the advantages of simple product structure, convenient installation, and low installation cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a structural sectional view of the utility model.

[0011] Figure 2 It is a left view of the utility model.

[0012] In the figure: 1 valve body, 2 valve seat, 3 valve disc, 4 radial positioning shaft, 5 torsion spring, 6 outlet flange, 7 inlet flange, 8 conical slope, 9 sewage monitoring pipe, 10 connecting lug. DETAILED DESCRIPTION

[0013] like Figure 1 , Figure 2The eccentric variable-diameter check valve shown comprises a valve body 1, a valve seat 2 and a valve disc 3. The valve seat 2 is arranged in a radial annular step between the inlet pipe and the outlet pipe of the valve body 1. The inlet pipe is connected to the water pump outlet through the inlet flange 7, and the outlet pipe is connected to the pipe system through the outlet flange 6. The characteristic of the eccentric variable-diameter check valve is that the inlet pipe is composed of a small-diameter pipe, an expanded-diameter pipe and a large-diameter pipe to form a variable-diameter eccentric structure. The flow channel diameter of the small-diameter pipe is equal to the flow channel diameter of the water pump outlet pipe, and the two are connected to each other through a flange. The upper part of the flow channel of the expanded-diameter pipe has a conical surface structure, and the lower part is a cylindrical surface structure, forming an eccentric structure between the center line of the large-diameter pipe and the center line of the small-diameter pipe. After the medium enters the expanded-diameter pipe from the small-diameter pipe, the flow area of ​​the upper part of the flow channel gradually expands along the conical surface, and the pressure of the medium entering the upper part of the large-diameter pipe is less than the pressure of the medium at the lower part. The valve disc 3 is installed on the radial positioning shaft 4 in the outlet pipe through the torsion spring 5. The torsion spring 5 strengthens the torsion force when the valve disc 3 rotates clockwise. There is an axial gap between the back of the sealing surface of the valve disc 3 and the radial positioning shaft 4, and the axial gap is at least equal to the radial distance between the contact surface of the valve disc 3 and the valve seat 2. The medium pushes the back of the valve disc 3 to contact the radial positioning shaft 4 through the large-diameter pipe. After the medium passes through the expanded-diameter pipe, the thrust generated on the lower part of the valve disc 3 is greater than the thrust on the upper part, so that the valve disc 3 rotates clockwise and the valve opens. When the water pump stops, the medium pressure in the inlet pipe disappears, and the torsion spring 5 causes the valve disc 3 to rotate counterclockwise and reset, and presses the valve disc 3 and the valve seat 2 to seal and prevent reverse medium from flowing back. The product has a simple structure and low cost, and the valve body 1 can directly connect the water pump to the pipeline system, reducing the expansion pipe and reducing the equipment installation cost.

[0014] A positioning device is provided between the valve disc 3 and the radial positioning shaft 4, and the positioning device is composed of two connecting lugs 10 fixed on the back of the valve disc 3 and the outer cylindrical surfaces at both ends of the radial positioning shaft 4 are connected to each other; the two connecting lugs 10 have U-shaped connecting holes, and the open ends of the U-shaped connecting holes are welded to the two sides of the radial arc groove on the back of the valve disc 3, and the radial arc groove is arranged in the diameter direction of the back of the valve disc 3. The diameter of the radial arc groove and the arc of the U-shaped connecting hole is equal to the diameter of the radial positioning shaft 4, so that the radial positioning shaft 4 is limited to rotate between the two sides of the U-shaped connecting hole of the connecting lug 10, so as to realize the up and down positioning of the valve disc 3, and the maximum distance between the arc of the U-shaped connecting hole and the radial arc groove on the back of the valve disc 3 is at least equal to the sum of the diameter of the radial positioning shaft 4 and the axial clearance. The axial clearance is the axial clearance between the back side of the valve disc 3 and the radial positioning shaft 4, so that the connecting lug 10 can drive the valve disc 3 to move axially along the outlet pipe of the valve body 1 on the radial positioning shaft 4, and when the radial arc groove on the back side of the valve disc 3 contacts the outer cylindrical surface of the radial positioning shaft 4, it is ensured that the valve disc 3 can rotate unimpeded in the channel of the valve seat 2; an axial limiting device is provided between the outer end surfaces of the two connecting lugs 10 and the radial positioning shaft 4 to prevent the valve disc 3 from moving axially along the radial positioning shaft 4, and the axial limiting device can be composed of the outer end surfaces of the two connecting lugs 10 and the retaining ring installed in the outer cylindrical groove of the radial positioning shaft 4, or it can be composed of a radial positioning pin set on the radial positioning shaft 4 at the outer end surfaces of the two connecting lugs 10.

[0015] A conical slope 8 is arranged at the lower part of the large diameter pipeline, which is upward along with the medium flow direction. When the medium passes through the large diameter pipeline, the lower medium generates an upward impulse, which pushes the lower part of the valve disc 3 to rotate and rise, thereby increasing the medium flow area.

[0016] A sewage monitoring pipe 9 is provided on the upper part of the large diameter pipeline, through which the dirt in the valve body 1 can be cleaned to prevent dirt accumulation from affecting the sealing performance between the valve disc 3 and the valve seat 2. At the same time, a pressure detection device can also be installed to monitor the pressure of the water pump in real time when it is working.

Claims

1. An eccentric variable diameter check valve, comprising a valve body (1), a valve seat (2), and a valve disc (3), wherein the valve seat (2) is arranged in a radial annular step between an inlet pipe and an outlet pipe of the valve body (1); wherein: The inlet pipe is composed of a small diameter pipe, an expanded diameter pipe and a large diameter pipe to form a variable diameter eccentric structure. The flow channel diameter of the small diameter pipe is equal to the flow channel diameter of the water pump outlet pipe, and the two are connected to each other through a flange. The flow channel of the expanded diameter pipe has a conical surface structure at the upper part and a cylindrical surface structure at the lower part, forming an eccentric structure in which the center line of the large diameter pipe and the center line of the small diameter pipe are eccentric. The valve disc (3) is installed on the radial positioning shaft (4) in the outlet pipe through a torsion spring (5). The torsion spring (5) increases the torque when the valve disc (3) rotates clockwise. There is an axial gap between the back side of the sealing surface of the valve disc (3) and the radial positioning shaft (4), and the axial gap is at least equal to the radial distance between the contact surface of the valve disc (3) and the valve seat (2).

2. The eccentric variable diameter check valve according to claim 1 is characterized in that: A positioning device is provided between the valve disc (3) and the radial positioning shaft (4), the positioning device comprising two connecting lugs (10) fixedly mounted on the back of the valve disc (3) and connected to the outer cylindrical surfaces at both ends of the radial positioning shaft (4); the two connecting lugs (10) have U-shaped connecting holes, the opening ends of the U-shaped connecting holes are welded to the two sides of the radial arc groove on the back of the valve disc (3), the diameters of the radial arc groove and the arc portion of the U-shaped connecting hole are equal to the diameter of the radial positioning shaft (4), and the maximum distance between the arc of the U-shaped connecting hole and the radial arc groove on the back of the valve disc (3) is at least equal to the sum of the diameter of the radial positioning shaft (4) and the axial clearance; an axial limit device is provided between the outer end surfaces of the two connecting lugs (10) and the radial positioning shaft (4).

3. The eccentric variable diameter check valve according to claim 1 or 2, characterized in that: A conical inclined surface (8) is arranged at the lower part of the large diameter pipeline, which is upward along the flow direction of the medium.

4. The eccentric variable diameter check valve according to claim 3 is characterized in that: A sewage monitoring pipe (9) is provided on the upper part of the large diameter pipeline.

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