Single-side support split check valve

Abstract

The utility model discloses a unilateral support split check valve which comprises a valve body, and a valve seat is fixed inside the valve body. The valve body is rotationally connected with the shaft through a bearing; one end of the shaft is fixedly connected with a heavy hammer, and the other end of the shaft is fixedly connected with the valve plate; the valve plate is lapped on the valve seat; the number of the shafts is two, and the two shafts are distributed on the left side and the right side of the valve body. The valve plate is composed of an upper half part and a lower half part, the shaft on the left side is fixedly connected with the upper half part of the valve plate, and the shaft on the right side is fixedly connected with the lower half part of the valve plate. The split check valve solves the problems that due to the fact that two shafts of an existing split check valve need to be connected through a shaft sleeve, operation of the valve is not flexible, the opening pressure difference is large, and the leakage rate cannot meet the requirement.

Description

Technical Field

[0001] The utility model belongs to the technical field of valves and relates to a single-side supported split-type check valve. Background Art

[0002] The split check valve is generally installed at the air outlet of the fan in the ventilation system of the nuclear power plant. It plays the role of isolating unexpected reverse airflow in the ventilation system. When the fan is running, the positive pressure formed in front of the valve acts on the valve plate, forming a pressure that overcomes the valve plate torque and the weight torque to open the valve plate. When an unexpected reverse airflow occurs, the valve plate closes under the gravity of the weight, which plays the role of isolating the reverse airflow.

[0003] The two shafts of the existing split check valve are connected together by a shaft sleeve. Since the concentricity of the two shafts is difficult to meet the requirements, the valve operation is inflexible, the opening pressure difference is large, and the leakage volume does not meet the requirements. Summary of the invention

[0004] In order to achieve the above purpose, the utility model provides a single-side supported split check valve, which solves the problem that the existing split check valve has two shafts that need to be connected by a shaft sleeve, resulting in inflexible valve operation, large opening pressure difference, and insufficient leakage.

[0005] In order to solve the above technical problems, the technical solution adopted by the utility model is a one-side supported split check valve, comprising a valve body, a valve seat is fixed inside the valve body; the valve body is rotatably connected to a shaft through a bearing; a weight is fixedly connected to one end of the shaft, and the other end of the shaft is fixedly connected to a valve plate; the valve plate is overlapped on the valve seat;

[0006] There are two shafts, and the two shafts are distributed on the left and right sides of the valve body; the valve plate is composed of upper and lower halves, the shaft on the left is fixedly connected to the upper half of the valve plate, and the shaft on the right is fixedly connected to the lower half of the valve plate.

[0007] Furthermore, the shaft is fixedly connected to the valve plate via a first adjustable connecting plate and a second adjustable connecting plate.

[0008] Furthermore, the first adjustable connecting plate is fixedly sleeved on the shaft, the second adjustable connecting plate is a 90-degree bent piece, one side of the bend is on the valve plate, and the other side of the bend is fixedly connected to the first adjustable connecting plate through a long slot and a fastener.

[0009] Furthermore, the long slot of the first adjustable connecting plate and the long slot of the second adjustable connecting plate are perpendicular to each other.

[0010] Furthermore, the bearing is fixed in the bearing seat through a bearing cover, and the bearing seat is fixed in the valve body.

[0011] Furthermore, the bearing cover and the bearing are overfitted, with the maximum clearance controlled within 0.02 mm and the maximum interference controlled within 0.01 mm.

[0012] Furthermore, the shaft and the bearing are clearance-fitted, and the maximum clearance is controlled within 0.02 mm.

[0013] Furthermore, the valve seat includes an intermediate valve seat and an outer valve seat, wherein the shape of the outer valve seat matches the internal shape of the valve body, and the outer valve seat is fixed to the valve body; the intermediate valve seat is located at the center line of the outer valve seat, dividing the outer valve seat into upper and lower halves.

[0014] Furthermore, the lower edge of the upper half of the valve plate and the upper edge of the lower half of the valve plate are both overlapped on the middle valve seat, and a gap is left between the lower edge of the upper half of the valve plate and the upper edge of the lower half of the valve plate.

[0015] The beneficial effects of the utility model are:

[0016] 1. The shaft support of this check valve adopts a single-side support split structure, removing the connecting sleeve between the shafts, avoiding the requirement of the connecting sleeve for coaxiality. This structure is simple and reliable, and is suitable for small-sized circular and rectangular split structure check valves.

[0017] 2. The long holes arranged in a staggered manner between the first adjustable connecting plate and the second adjustable connecting plate ensure that the position of the valve plate can be adjusted up and down and left and right during the assembly process, thereby eliminating the errors between the shaft center and the valve seat and valve plate sealing surface caused by the processing errors of the valve seat and the bearing seat and the gap between the shaft and the bearing, thereby ensuring that the valve plate and the valve seat fit well, thereby ensuring the sealing performance of the valve and the reliability of operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 It is a structural schematic diagram of a single-side supported split-open check valve according to an embodiment of the utility model.

[0020] Figure 2 It is a schematic diagram of the installation position of the valve plate and the valve seat of the embodiment of the utility model.

[0021] Figure 3 yes Figure 2 Enlarged view of point A in the middle.

[0022] Figure 4 It is a structural schematic diagram of the first adjustable connecting plate of an embodiment of the utility model.

[0023] Figure 5 yes Figure 4 Left view of .

[0024] Figure 6 It is a structural schematic diagram of the second adjustable connecting plate of an embodiment of the utility model.

[0025] Figure 7 yes Figure 6 Left view of .

[0026] In the figure, 1. valve body, 2. valve seat, 3. middle valve seat, 4. outer valve seat, 5. shaft, 6. weight, 7. valve plate, 8. first adjustable connecting plate, 9. second adjustable connecting plate, 10. bearing, 11. bearing cover, 12. bearing seat. DETAILED DESCRIPTION

[0027] 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.

[0028] like Figure 1 to Figure 7 As shown, the utility model provides a single-side supported split check valve, comprising a valve body 1, which is circular or rectangular; a valve seat 2 is fixed inside the valve body 1; the valve seat 2 comprises an intermediate valve seat 3 and an outer valve seat 4, wherein the shape of the outer valve seat 4 matches the internal shape of the valve body 1 and is fixed to the valve body 1, and the intermediate valve seat 3 is located inside the outer valve seat 4, dividing the outer valve seat 4 into upper and lower halves; the valve body 1 is rotatably connected to a shaft 5 through a bearing 10; a weight 6 is fixedly connected to one end of the shaft 5, and the other end of the shaft 5 is fixedly connected to a valve plate 7 through a first adjustable connecting plate 8, a set screw or a pin, a second adjustable connecting plate 9, bolts, nuts and other fasteners.

[0029] In some embodiments, the bearing 10 is fixed in the bearing seat 12 through the bearing cover 11, and the bearing seat 12 is fixed in the valve body 1. The bearing cover 11 and the bearing 10 are overfitted, and the maximum clearance is controlled within 0.02 mm, and the maximum interference is controlled within 0.01 mm; the shaft 5 and the bearing 10 are clearance-fitted, and the maximum clearance is controlled within 0.02 mm; thereby ensuring the stability of the rotation of the shaft 5.

[0030] In some embodiments, the valve plate 7 is composed of an upper and lower half, the shaft 5 on the left side is fixedly connected to the upper half of the valve plate 7, and the shaft 5 on the right side is fixedly connected to the lower half of the valve plate 7 to achieve splitting. The lower edge of the upper half of the valve plate 7 and the upper edge of the lower half of the valve plate 7 overlap the middle valve seat 3, and a gap is left between the lower edge of the upper half of the valve plate 7 and the upper edge of the lower half of the valve plate 7 to prevent friction during switching.

[0031] In some embodiments, the first adjustable connecting plate 8 is sleeved on the shaft 5 and connected to the shaft 5 by a set screw or a pin, the second adjustable connecting plate 9 is fixed to the valve plate 7 by bolts and nuts, the second adjustable connecting plate 9 is a 90-degree bending structure, and the first adjustable connecting plate 8 and the second adjustable connecting plate 9 are both provided with long slots, and the long slots of the first adjustable connecting plate 8 and the second adjustable connecting plate 9 are perpendicular to each other; the long slots arranged in an alternating manner between the first adjustable connecting plate 8 and the second adjustable connecting plate 9 ensure that the position of the valve plate 7 can be adjusted up and down and left and right during the assembly process, thereby eliminating the errors between the center of the shaft 5 and the sealing surfaces of the valve seat 2 and the valve plate 7 caused by the machining errors of the valve seat 2 and the bearing seat 12 and the gap between the shaft 5 and the bearing 10, thereby ensuring that the valve plate 7 is well fitted with the valve seat 2, thereby ensuring the sealing performance and operation reliability of the valve.

[0032] In some embodiments, the valve plate 7 needs to be at a certain distance from the shaft 5 so that the valve plate 7 does not generate friction with the valve seat 2 during rotation, thereby ensuring the flexibility of its operation.

[0033] The working process of the utility model is:

[0034] When the fan is running, the positive pressure formed in front of the valve acts on the valve plate 7, forming a pressure that overcomes the valve plate torque and the weight torque to open the valve plate. When an unexpected reverse airflow occurs, the valve plate 7 is closed under the gravity of the weight 6, which plays a role in isolating the reverse airflow. When the sealing is not tight during the manufacturing process or after long-term use, the leakage volume cannot meet the requirements, the long hole opened in the first adjustable connecting plate 8 can be used to adjust the distance between the valve plate 7 and the valve seat 2, eliminate the error between the center of the shaft 5 and the valve seat 2 caused by the processing error of the valve seat 2 and the bearing seat 12 and the gap between the shaft 5 and the bearing 10, so as to ensure that the valve plate 7 fits tightly with the valve seat 2 and meet the sealing requirements; the long hole opened in the second adjustable connecting plate 9 can eliminate the upper and lower errors between the middle valve seat 3 and the center of the shaft 5, so as to ensure that the valve plate 7 fits tightly with the middle valve seat 3 and there is a certain gap between the upper and lower parts of the valve plate 7, so as to achieve the reliability of sealing and operation.

[0035] Each embodiment in this specification is described in a related manner, and the same or similar parts between the embodiments can be referenced to each other, and each embodiment focuses on the differences from other embodiments.

[0036] The above description is only a preferred embodiment of the present invention and is not intended to limit the protection scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention are included in the protection scope of the present invention.

Claims

1. A one-side supported split-open check valve, comprising a valve body (1), characterized in that: A valve seat (2) is fixed inside the valve body (1); the valve body (1) is rotatably connected to the shaft (5) via a bearing (10); a weight (6) is fixedly connected to one end of the shaft (5), and the other end of the shaft (5) is fixedly connected to the valve plate (7); the valve plate (7) is overlapped on the valve seat (2); The number of the shafts (5) is two, and the two shafts (5) are distributed on the left and right sides of the valve body (1); the valve plate (7) is composed of an upper and lower half, the shaft (5) on the left side is fixedly connected to the upper half of the valve plate (7), and the shaft (5) on the right side is fixedly connected to the lower half of the valve plate (7).

2. A one-side supported split-open check valve according to claim 1, characterized in that: The shaft (5) is fixedly connected to the valve plate (7) via a first adjustable connecting plate (8) and a second adjustable connecting plate (9).

3. A one-side supported split-open check valve according to claim 2, characterized in that: The first adjustable connecting plate (8) is fixedly sleeved on the shaft (5); the second adjustable connecting plate (9) is a 90-degree bent piece, one side of the bend is on the valve plate (7), and the other side of the bend is fixedly connected to the first adjustable connecting plate (8) via a long slotted hole and a fastener.

4. A one-side supported split-open check valve according to claim 3, characterized in that: The long slotted hole of the first adjustable connecting plate (8) and the long slotted hole of the second adjustable connecting plate (9) are perpendicular to each other.

5. The one-side supported split-open check valve according to claim 1, characterized in that: The bearing (10) is fixed in a bearing seat (12) via a bearing cover (11), and the bearing seat (12) is fixed in the valve body (1).

6. A one-side supported split-open check valve according to claim 5, characterized in that: The bearing cap (11) and the bearing (10) are overfitted, with the maximum clearance controlled within 0.02 mm and the maximum interference controlled within 0.01 mm.

7. The one-side supported split-open check valve according to claim 1, characterized in that: The shaft (5) and the bearing (10) are clearance-matched, and the maximum clearance is controlled within 0.02 mm.

8. The one-side supported split-open check valve according to claim 1, characterized in that: The valve seat (2) comprises an intermediate valve seat (3) and an outer valve seat (4), wherein the shape of the outer valve seat (4) matches the internal shape of the valve body (1), and the outer valve seat (4) is fixed to the valve body (1); the intermediate valve seat (3) is located at the inner center line of the outer valve seat (4), dividing the outer valve seat (4) into upper and lower halves.

9. A one-side supported split-open check valve according to claim 8, characterized in that: The lower edge of the upper part of the valve plate (7) and the upper edge of the lower part of the valve plate (7) are both overlapped on the middle valve seat (3), and a gap is left between the lower edge of the upper part of the valve plate (7) and the upper edge of the lower part of the valve plate (7).

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