Gravity type one-way valve

Abstract

The utility model provides a gravity type one-way valve which comprises a valve body, a blade, a shaft side baffle and a linkage mechanism. The one-way valve has the advantages of being simple in structure, light in weight and stable in performance, closing of the one-way valve can be achieved through the weight of the blades in air flow from top to bottom, a tedious pneumatic or electric control system is replaced, and the one-way valve is more suitable for being installed in a channel which is limited in installation space and inconvenient to disassemble. The opening angle of the blades can be better controlled during opening, the blades are of a special structure, every two blades intersect during closing, a limiting mechanism is arranged on the side face of each blade, and the leakproofness and reliability of the one-way valve can be guaranteed to the maximum degree. Noise generated during opening and closing can be effectively reduced, the protection effect is achieved, and the service life of the one-way valve is prolonged.

Description

Technical Field

[0001] The utility model belongs to the field of valves, and in particular relates to a gravity type one-way valve. Background Art

[0002] In order to prevent gas backflow, a one-way valve needs to be installed in the equipment channel, which can play a role of safety isolation to prevent equipment failure. The one-way valve plays a vital role in the channel with airflow.

[0003] The one-way valve in the gas channel can be divided into two installation methods according to the installation method: vertical and horizontal.

[0004] In order to facilitate installation and reduce costs, horizontal installations mostly rely on the deadweight of the blade to close the one-way valve, and a few are electric or pneumatic. When installed vertically, one situation is that the airflow flows from bottom to top, and the one-way valve can be closed by the deadweight of the blade. Another situation is that the airflow flows from top to bottom, and electric or pneumatic control is mostly used at this time. In order to reduce maintenance costs, a gravity-type one-way valve has been developed. Summary of the invention

[0005] In view of the above technical problems, the utility model provides a gravity type one-way valve.

[0006] In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model is: a gravity-type one-way valve, including a valve body, a blade, a shaft side baffle and a linkage mechanism.

[0007] The one-way valve is installed vertically, and the airflow is from top to bottom. When airflow passes through, the blades are automatically opened by the impact of the airflow. When there is no airflow, the blades close the one-way valve due to their own center of gravity being biased to one side. Limit baffles are provided in the open and closed states of the blades to prevent the center of gravity from shifting and causing the one-way valve to fail.

[0008] The valve body includes a shell assembly, a left limit baffle, a right limit baffle, a lower limit baffle and a buffer pad. The shell assembly is formed by bending four plates into an L-shape and welding; the left limit baffle, the right limit baffle and the lower limit baffle are all welded to the shell assembly to limit the blade; the left limit baffle, the right limit baffle and the lower limit baffle are all pasted with a buffer pad to prevent the blade from making abnormal noise after rotating to a fixed position, and to protect the valve body and the blade.

[0009] The blade includes a blade body, a blade shaft, a shaft limit baffle, a short connecting rod, a counterweight and a buffer pad. The blade body is made of steel and bent into a form that can be buckled on both sides. The blade can achieve maximum sealing and limiting effects when it is closed; the shaft limit baffle and the blade shaft are welded to the blade body. First, the blade shaft passes through the shaft limit baffle and then is welded to the blade body together. Three shaft limit baffles are welded on each blade body. The three shaft limit baffles are evenly distributed. The shaft limit baffles on both sides are symmetrical with respect to the center line of the length direction of the blade body. The other shaft limit baffle is located on the center line, which can maximize the parallelism between the blade shaft end face and the blade body end face; the short connecting rod is welded to the long notch of the blade body close to the edge of the blade body, and is located on the center line of the length direction; the counterweight is installed on one side of the short side of the blade body, and the counterweight is riveted to the blade body by a blind rivet. When the counterweights are installed, they are ensured to be symmetrical with respect to the center line of the length direction of the blade body; a buffer pad is pasted in the limit groove on one side of the short side of the blade body. It prevents abnormal noise caused by the contact between the blade and the valve body when the blade rotates to the closed state, and plays a role in protecting the blade.

[0010] The shaft side baffle includes a through-shaft plate and a polytetrafluoro gasket. The through-shaft plate is a several-shaped piece formed by bending a steel plate. A gap is left between the maximum dimension of the through-shaft plate in the length direction and the inner end surface of the valve body to ensure the horizontality of the through-shaft plate and the flange surface during riveting. A polytetrafluoro gasket is embedded in the through-shaft hole of the through-shaft plate to play a lubricating role during the rotation of the blades.

[0011] The linkage mechanism includes a long connecting rod, bolts and nuts. The long connecting rod and the short connecting rod are connected by bolts and nuts. A gap is left between the nut and the short connecting rod during connection. After the connection is completed, the bolts and the nuts are spot welded and anti-loosening treatment is performed to prevent the linkage mechanism parts from falling off during the rotation of the blades.

[0012] The assembly sequence and method of the one-way valve are as follows: first, the blade body and the counterweight are riveted together by means of blind rivets, and then a buffer pad is pasted in the limiting groove of the blade body, and then the blade is assembled into the through-shaft hole of the shaft side baffle, and the flange surface of the valve body is placed on a horizontal tooling, and the blade body and the shaft side baffle are installed to ensure the horizontality and verticality of the shaft side baffle, and the through-shaft holes of the shaft side baffles on both sides are concentric, and the shaft side baffle and the valve body are riveted by means of blind rivets to fix the position of the blade, and a polytetrafluoro washer is used between the shaft side baffle and the blade shaft for lubrication. The distance between the end face of the blade shaft and the valve body is smaller than the distance between the end face of the blade body and the shaft side baffle, so as to ensure that there is no interference between the blade and other components during the rotation of the blade.

[0013] After the blades and the shaft side baffles are installed, the left limit baffle, right limit baffle and lower limit baffle are welded. The left limit baffle and the right limit baffle need to adjust the blades to a horizontal state. A buffer pad gap is left when welding the left limit baffle and the right limit baffle. After appropriate adjustment, the left limit baffle and the right limit baffle are welded and the buffer pad is pasted; the lower limit baffle needs to adjust the blade to a suitable angle so that the blade can return to a horizontal state by its own weight. At this time, the lower limit baffles on both sides are welded and the buffer pad is pasted.

[0014] After the one-way valve is installed, the valve body flange can be connected to other components. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of an embodiment of the utility model.

[0016] Figure 2 This is a schematic diagram of the valve body structure of the utility model.

[0017] Figure 3 This is a schematic diagram of the blade structure of the utility model.

[0018] Figure 4 This is a schematic diagram of the main structure of the blade of the utility model.

[0019] Figure 5 This is a schematic diagram of the shaft side baffle structure of the utility model.

[0020] Figure 6 It is a schematic diagram of the linkage mechanism structure of the utility model.

[0021] Figure 7 It is a cross-sectional view of the blades of the present invention in an open state.

[0022] Figure 8 It is a cross-sectional view of the utility model in a closed state of the blades. DETAILED DESCRIPTION

[0023] The present invention is further described below in conjunction with the accompanying drawings and embodiments: Embodiment 1: A gravity-type one-way valve comprises a valve body 1, a blade 2, an axial side baffle 3 and a linkage mechanism 4.

[0024] Further Figure 1 As shown: the two axial ends of the blade 2 pass through the axial side baffle 3, and then the blade 2 and the axial side baffle 3 are riveted to the valve body 1 with blind rivets, and multi-point riveting is used to ensure a firm installation. The distances between the blades 2 are equal, and the axial side baffle 3 is aligned with the two ends of the valve body 1. During the installation process, the horizontality of the axial side baffle 3 and the flange of the valve body 1 is ensured, and then the linkage mechanism 4 is installed. The linkage mechanism 4 is installed under the blade 2. After the connection is completed, the synchronous rotation of the blades can be achieved.

[0025] Further Figure 2 As shown: the valve body 1 includes a shell component 5, a left limit baffle 6, a right limit baffle 7, a lower limit baffle 8 and a buffer pad 9; the shell component 5 is welded into a square, the left limit baffle 6 and the right limit baffle 7 are welded to the left and right sides, and the welding height is matched according to the installation height of the blade 2. The left limit baffle 6 and the right limit baffle 7 are the limits when the blade 2 rotates to a horizontal state, and the lower limit baffle 8 is welded to the front and rear sides, and the welding height is matched according to the maximum angle of the blade 2. At the bottom, the maximum rotation angle of the blade 2 is determined by the center of gravity of the blade 2 during rotation. The center of gravity of the blade 2 must be ensured to be on one side of the counterweight block. The welding height is determined by theoretical calculations and actual field tests. The buffer pad 9 is pasted at the position where the left limit baffle 6, the right limit baffle 7, and the lower limit baffle 8 contact the blade 2. The pasting height of the buffer pad 9 is left during welding to prevent the blade 2 from not being able to fully rotate to a horizontal state when closed, and to prevent the blade 2 from having an angle deviation at the maximum angle after opening.

[0026] Further Figure 3 As shown: the blade 2 includes a blade body 10, a blade shaft 11, a shaft limiting baffle 12, a short connecting rod 13, a counterweight 14 and a buffer pad 9; the shaft limiting baffle 12 is evenly welded to the side of the blade body 10 close to the short slot, and the blade shaft 11 passes through the shaft limiting baffle 12. After passing through, the distance between the blade shaft 11 and the two ends of the blade body 10 is ensured to be equal, and then the blade body 10, the blade shaft 11 and the shaft limiting baffle 12 are welded together, and then the short connecting rod 13 is welded. The short connecting rod 13 is welded to the side of the long slot of the blade body 10 close to the edge of the blade body and is located on the center line of the length direction of the blade body 10. The counterweight 14 is riveted above the short slot of the blade body 10 by rivets, and the buffer pad 9 is pasted into the short slot of the blade body 10.

[0027] Further Figure 4 As shown: the blade body 10 is made of steel and bent into a form in which the two sides can be buckled together, and the blade 2 can achieve maximum sealing and limiting effects in the closed state.

[0028] Further Figure 5 As shown: the shaft side baffle 3 includes a shaft through plate 16 and a polytetrafluoro gasket 17, the polytetrafluoro gasket 17 is inserted into the shaft through plate 16 and fixed with glue, the shaft through plate 16 is a steel plate bent into several shapes, the polytetrafluoro gasket 17 is a shaft sleeve with one end closed, the shaft through plate 16 is connected to the valve body 1 by a blind rivet, and when riveted, the two leg surfaces are fitted with the inner surface of the valve body 1, and the two ends of the shaft side baffle 3 are aligned with the valve body 1.

[0029] Further Figure 6 As shown: the linkage mechanism 4 includes a long connecting rod 18, a bolt 19 and a nut 20. The long connecting rod 18 is connected to the short connecting rod 13 by the bolt 19 and the nut 20. The gap between the bolt 19 and the nut 20 is greater than the thickness between the short connecting rod 13 and the long connecting rod 18 to ensure the smoothness of the rotation of the blade 2. After installation, the bolt 19 and the nut 20 are welded together to prevent the blade 2 from falling off due to long-term rotation.

[0030] Further Figure 7 As shown: The figure shows a cross-sectional view of the blade 2 in the open state. When air flows through, the gravity of the blade 2 is less than the pressure of the air flow acting on the blade 2, and the blade opens. The actual opening angle can be adjusted according to the height dimension of the valve body 1 and the position of the lower limit baffle 8.

[0031] Further Figure 8 As shown: The figure shows a cross-sectional view of the blade 2 in the closed state. When there is no airflow passing through, the blade 2 is closed because the center of gravity is biased toward the side of the counterweight block 14. The blades 2 are buckled in pairs in the closed state, and the leftmost and rightmost blades are in contact with the left limit baffle 6 and the right limit baffle 7, which can achieve maximum sealing.

Claims

1. A gravity check valve, characterized by: The invention comprises a valve body (1), a blade (2), a shaft side baffle (3) and a linkage mechanism (4); the gravity check valve is installed vertically, and the airflow is from top to bottom. When the airflow passes through, the blade is automatically opened by the impact of the airflow. When there is no airflow, the blade closes the check valve due to the center of gravity offset of its own counterweight. The blade is provided with a limit baffle in both the open and closed states to prevent the center of gravity offset from causing the check valve to fail; the valve body (1) comprises a housing assembly (5), a left limit baffle (6), a right limit baffle (7), a lower limit baffle (8) and a buffer pad (9); the blade (2) comprises a blade body (10), a blade shaft (11), a shaft limit baffle (12), a short connecting rod (13), a counterweight (14) and a buffer pad (9); the shaft side baffle (3) comprises a shaft through plate (16) and a polytetrafluoroethylene gasket (17); the linkage mechanism (4) comprises a long connecting rod (18), a bolt (19) and a nut (20).

2. A gravity check valve according to claim 1, characterized in that: The valve body (1) is characterized in that: the shell assembly (5) is formed by bending and welding steel plates; the left limit baffle (6), the right limit baffle (7), and the lower limit baffle (8) can control the opening and closing angles of the blade (2); the buffer pad (9) can prevent the blade (2) from making abnormal noise after rotating to a fixed position, and plays a role in protecting the valve body (1) and the blade (2).

3. A gravity check valve according to claim 1, characterized in that: The blade (2) is characterized in that: the main body of the blade (2) is made of steel and bent into a form in which both sides can be buckled together, and the closed state of the blade (2) can achieve maximum sealing and limiting effects; the counterweight block (14) can realize the closure of the gravity-type one-way valve when there is no airflow.

4. A gravity-type one-way valve according to claim 1, characterized in that: The shaft side baffle (3) is characterized in that: the shaft through plate (16) is a several-shaped part formed by bending a steel plate, and its two sides are fitted with the valve body (1) and connected together by riveting; the polytetrafluoroethylene gasket (17) is a shaft sleeve with one end closed, embedded in the shaft through hole of the shaft through plate (16), and plays a lubricating role; the blade shaft (11) passes through the shaft side baffle (3) to realize the rotation of the blade (2).

5. A gravity-type one-way valve according to claim 1, characterized in that: The linkage mechanism (4) is characterized in that the long connecting rod (18) and the short connecting rod (13) are connected together through the bolt (19) and the nut (20) to achieve the linkage of the blades (2).

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