Low-leakage square round connector single-plate check valve

Abstract

The utility model belongs to the technical field of valves, and particularly relates to a low-leakage single-plate check valve with a square round connector, which comprises a valve body, a valve plate arranged in the valve body, a valve rod rotationally connected with the valve body, and a counter weight connected with the valve plate by the aid of the valve rod. A first sealing ring is arranged on the valve plate, a second sealing ring is arranged on the valve plate, when the valve plate is closed, the first sealing ring is attached to the second sealing ring, the attaching face of the first sealing ring and the second sealing ring is parallel to the valve plate, the first sealing ring and the second sealing ring are in plane contact and extrude each other, and the sealing performance 1 of the check valve can be effectively improved; the first sealing ring and the second sealing ring have the vibration absorption effect, vibration generated when the valve plate collides with the valve body in the heavy hammer falling process is reduced, and the valve plate is prevented from falling off.

Description

Technical Field

[0001] The utility model belongs to the technical field of valves, and in particular relates to a low-leakage square round interface single-plate check valve. Background Art

[0002] The check valve is a safety valve, which is mostly used in ventilation systems such as fans, central air conditioners, and air handling units. The ventilation system provides flow for the system. The problem that affects the flow resistance in the system is the main problem of the whole system design. The working principle of the check valve is: when the system is running, the positive pressure formed in front of the valve opens the valve plate. When the system stops running, the valve plate automatically closes due to the loss of positive pressure and the gravity of the weight and valve plate to prevent the system from backflowing; and when the system is running, the fan has a large air volume, and the weight falls quickly when the system is closed, causing the valve plate to vibrate greatly when it is opened and closed, which can easily cause the valve plate to fall off; on the other hand, when the fan is closed, the pressure in the pipeline is released or other flow backflows to the ventilation duct system cause the fan impeller to reverse, which can easily damage valuable equipment. In the prior art, the inner wall of the valve body in the check valve is usually used to fit the sealing ring on the valve plate, but the inner wall of the valve body is difficult to process to the accuracy required for low leakage. How to minimize the internal leakage of the check valve while ensuring that the system is prevented from backflowing has become an urgent problem to be solved for this type of valve. Utility Model Content

[0003] In order to solve the problems existing in the prior art, the utility model provides a low-leakage square circular interface single-plate check valve, which can improve the sealing performance between the check valve plate and the valve body, thereby effectively reducing the internal leakage of the check valve.

[0004] The specific technical solution adopted by the utility model is:

[0005] A low-leakage square circular interface single-plate check valve comprises a valve body, a valve plate arranged in the valve body, a valve stem rotatably connected to the valve body, and a weight connected to the valve plate by means of the valve stem. The key lies in that a valve seat with a first sealing ring is arranged in the air inlet of the valve body, a second sealing ring is arranged on the valve plate, and when the valve plate is closed, the first sealing ring is fitted with the second sealing ring, and the fitting surface of the first sealing ring and the second sealing ring is parallel to the valve plate.

[0006] The valve seat is provided with a first mounting groove for installing a first sealing ring, and the valve plate is provided with a second mounting groove for installing a second sealing ring. The cross-sections of the first mounting groove and the second mounting groove are both trapezoidal, and the upper bottom of the trapezoidal first mounting groove is adjacent to the upper bottom of the trapezoidal second mounting groove. The cross-sections of the first sealing ring and the second sealing ring are both trapezoidal.

[0007] The valve body is provided with a buffer limit block matched with the opened valve plate.

[0008] A first bearing base with a first bearing thereon and a second bearing base with a second bearing thereon are respectively arranged on the front and rear sides of the valve body, the first bearing base is fixedly connected to a bearing cover, the first bearing is installed in the bearing cover, the second bearing base is fixedly connected to a bearing end cover, the second bearing is installed in the bearing end cover, the front end of the valve stem passes through the axial hole of the first bearing base to be connected to the first bearing, the rear end of the valve stem passes through the axial hole of the second bearing base to be connected to the second bearing, and the front end of the valve stem is also connected to a weight located on the outside of the bearing cover.

[0009] A first O-ring is arranged between the front end of the bearing cover and the valve stem, a second O-ring is arranged between the rear end of the bearing cover and the first bearing base, and a third O-ring is arranged between the bearing end cover and the second bearing base.

[0010] The valve plate is fixedly connected to the valve stem by means of a group of connecting rods arranged at intervals.

[0011] The valve plate and the valve stem are fixedly connected by means of a conical pin.

[0012] A protective cover is arranged on the valve body, and the heavy hammer is located inside the protective cover.

[0013] A group of notches are arranged at intervals on the outer sides of the first sealing ring and the second sealing ring, respectively, and the notches on the first sealing ring and the notches on the second sealing ring are arranged alternately.

[0014] The beneficial effects of the utility model are:

[0015] The utility model adopts a technical solution of adding a valve seat in the valve body, a first sealing ring on the valve seat, and a second sealing ring on the valve plate. When the valve plate is closed, the first sealing ring and the second sealing ring fit together to achieve sealing. The fitting surfaces of the first sealing ring and the second sealing ring are parallel to the valve plate. Under the influence of the gravity of the weight hammer, the first sealing ring and the second sealing ring are in plane contact and squeezed against each other, which can effectively improve the sealing performance of the check valve. At the same time, when the valve plate is closed, the first sealing ring and the second sealing ring both produce a vibration absorption effect, reducing the vibration generated by the collision between the valve plate and the valve body during the falling process of the weight hammer, and preventing the valve plate from falling off. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the utility model;

[0017] Figure 2 for Figure 1 A magnified view of the part A in the middle;

[0018] Figure 3 It is the front view of the utility model;

[0019] Figure 4 for Figure 3 A cross-sectional view of BB;

[0020] Figure 5 for Figure 4 A magnified view of the local C in the middle;

[0021] Figure 6 for Figure 4 A magnified view of the local D in the middle;

[0022] Figure 7 is a schematic structural diagram of a first sealing ring;

[0023] In the accompanying drawings, 1. valve body, 2. valve plate, 3. valve stem, 4. weight, 5. first sealing ring, 6. valve seat, 7. second sealing ring, 8. first mounting groove, 9. second mounting groove, 10. buffer limit block, 11. first bearing, 12. first bearing base, 13. second bearing, 14. second bearing base, 15. bearing cover, 16. bearing end cover, 17. first O-ring, 18. second O-ring, 19. third O-ring, 20. connecting rod, 21. tapered pin, 22. protective cover, and 23 notch. DETAILED DESCRIPTION

[0024] The utility model is further described below in conjunction with the accompanying drawings and specific embodiments:

[0025] Specific implementation examples Figure 1-7 As shown, a low leakage square round interface single plate check valve comprises a valve body 1, a valve plate 2 arranged in the valve body 1, a valve stem 3 rotatably connected to the valve body 1, and a weight 4 connected to the valve plate 2 by means of the valve stem 3. The key is that a valve seat 6 with a first sealing ring 5 is arranged in the air inlet of the valve body 1, and a second sealing ring 7 is arranged on the valve plate 2. When the valve plate 2 is closed, the first sealing ring 5 fits with the second sealing ring 7, and the fitting surface of the first sealing ring 5 and the second sealing ring 7 is parallel to the valve plate 2. The first sealing ring 5 and the second sealing ring 7 are made of the same silicone rubber material, and the size and finish are the same. In this embodiment, a valve seat 6 and a first sealing ring 5 are added to the valve body 1. When the valve plate 2 and the valve body 1 are closed, the first sealing ring 5 and the second sealing ring 7 fit in a plane, which can effectively improve the sealing performance, thereby reducing the internal leakage and achieving low leakage. The overall structure is easy to assemble, and the layout is more coordinated, which greatly improves the practicality of the check valve.

[0026] The valve seat 6 is provided with a first mounting groove 8 for mounting the first sealing ring 5, and the valve plate 2 is provided with a second mounting groove 9 for mounting the second sealing ring 7. The cross-sections of the first mounting groove 8 and the second mounting groove 9 are both trapezoidal, and the upper bottom of the trapezoidal first mounting groove 8 is adjacent to the upper bottom of the trapezoidal second mounting groove 9. The cross-sections of the first sealing ring 5 and the second sealing ring 7 are both trapezoidal, and the upper bottom of the trapezoidal first sealing ring 5 is fitted and sealed with the upper bottom of the second sealing ring 7. Since the closing process of the valve plate 2 is that there is no positive pressure acting on the valve plate 2 after the system is closed, the valve plate 2 is rotated to close with the first sealing ring 5 on the valve seat 6 under the action of the weight of the heavy hammer 4, and the first sealing ring 5 and the second sealing ring 7 are squeezed and impacted. The upper bottom surfaces with smaller areas on the first sealing ring 5 and the second sealing ring 7 are in contact with each other, and the lower bottom surfaces with larger areas are respectively installed in the first mounting groove 8 and the second mounting groove 9, so that the first sealing ring 5 and the second sealing ring 7 have better stability and support strength, which helps to improve the sealing strength; once the system is turned on, the valve plate 2 is opened, and the first sealing ring 5 and the second sealing ring 7 are separated from each other. Under the action of inertia, the first sealing ring 5 and the second sealing ring 7 are easily ejected or loosened, and the trapezoidal first mounting groove 8 and the second mounting groove 9 in this embodiment respectively form obstructions for the first sealing ring 5 and the second sealing ring 7, effectively preventing the first sealing ring 5 and the second sealing ring 7 from slipping out of the first mounting groove 8 and the second mounting groove 9 due to the action of inertia, significantly improving the service life of the sealing ring and reducing the number of maintenance times.

[0027] The valve body 1 is provided with a buffer limit block 10 matching the opened valve plate 2. The buffer limit block 10 limits the opened valve plate 2 and at the same time buffers the impact and collision between the valve plate 2 and the valve body 1 when the valve plate 2 reaches the limit position, further preventing the valve plate 2 from falling off.

[0028] The valve body 1 is provided with a first bearing base 12 with a first bearing 11 thereon and a second bearing base 14 with a second bearing 13 thereon on the front and rear sides respectively. The first bearing base 12 is fixedly connected with a bearing cover 15, the first bearing 11 is installed in the bearing cover 15, the second bearing base 14 is fixedly connected with a bearing end cover 16, and the second bearing 13 is installed in the bearing end cover 16. The front end of the valve stem 3 passes through the axial hole of the first bearing base 12 to be connected with the first bearing 11, and the rear end of the valve stem 3 passes through the axial hole of the second bearing base 14 to be connected with the second bearing 13. The front end of the valve stem 3 is also connected with a heavy hammer 4 located on the outside of the bearing cover 15. The two ends of the valve stem 3 are connected to the valve body 1 by means of the first bearing 11 and the second bearing 13, respectively, so as to reduce the friction coefficient during the rotation of the valve stem 3 and enable the valve plate 2 to open and close smoothly.

[0029] A first O-ring 17 is arranged between the front end of the bearing cover 15 and the valve stem 3, a second O-ring 18 is arranged between the rear end of the bearing cover 15 and the first bearing base 12, and a third O-ring 19 is arranged between the bearing end cover 16 and the second bearing base 14 to ensure the sealing performance inside the valve body 1 and prevent internal pressure relief and air leakage when the valve body 1 is closed.

[0030] The valve plate 2 is fixedly connected to the valve stem 3 by means of a group of spaced connecting rods 20. In this embodiment, the valve plate 2 is connected to the valve stem 3 by means of two connecting rods 20. The connecting rods 20 are located on both sides of the valve plate 2, so that the installation of the valve plate 2 is more stable and secure, and is evenly supported.

[0031] The connecting rod 20 and the valve stem 3 are fixedly connected by means of a conical pin 21 , which improves the fastness between the connecting rod 20 and the valve stem 3 , facilitates installation and prevents the valve plate 2 from being displaced on the valve stem 3 .

[0032] The valve body 1 is provided with a protective cover 22, and the heavy hammer 4 is located in the protective cover 22 to prevent the heavy hammer 4 from falling off during the closing or opening process of the valve plate 2, thereby causing damage to surrounding equipment or personal injury.

[0033] A group of notches 23 are arranged at intervals on the outer side of the first sealing ring 5 and the outer side of the second sealing ring 7, respectively. The notches 23 on the first sealing ring 5 and the notches 23 on the second sealing ring 7 are arranged alternately. In this embodiment, three notches 23 are arranged on the outer side of the first sealing ring 5, and the three notches 23 are arranged in a ring array along the first sealing ring 5; three notches 23 are arranged on the outer side of the second sealing ring 7, and the three notches 23 are arranged in a ring array along the second sealing ring 7. When the valve plate 2 is closed, the notches 23 on the first sealing ring 5 and the notches 23 on the second sealing ring 7 are arranged alternately, and the notches 23 are used to absorb the deformation caused by the mutual extrusion of the first sealing ring 5 and the second sealing ring 7, so as to prevent the fitting surface between the first sealing ring 5 and the second sealing ring 7 from being distorted and causing poor sealing. The width of the bottom of the first sealing ring 5 and the second sealing ring 7 is L, and the depth h of the notch 23 is less than 1 / 3L.

Claims

1. A low leakage square round interface single plate check valve, comprising a valve body (1), a valve plate (2) arranged in the valve body (1), a valve stem (3) rotatably connected to the valve body (1), and a weight (4) connected to the valve plate (2) by means of the valve stem (3), characterized in that: A valve seat (6) with a first sealing ring (5) is arranged in the air inlet of the valve body (1), and a second sealing ring (7) is arranged on the valve plate (2). When the valve plate (2) is closed, the first sealing ring (5) and the second sealing ring (7) are in contact with each other, and the contact surfaces of the first sealing ring (5) and the second sealing ring (7) are parallel to the valve plate (2).

2. A low leakage square round interface single plate check valve according to claim 1, characterized in that: The valve seat (6) is provided with a first mounting groove (8) for mounting a first sealing ring (5), and the valve plate (2) is provided with a second mounting groove (9) for mounting a second sealing ring (7). The cross-sections of the first mounting groove (8) and the second mounting groove (9) are both trapezoidal, and the upper bottom of the trapezoidal first mounting groove (8) is adjacent to the upper bottom of the trapezoidal second mounting groove (9). The cross-sections of the first sealing ring (5) and the second sealing ring (7) are both trapezoidal.

3. A low leakage square round interface single plate check valve according to claim 1, characterized in that: The valve body (1) is provided with a buffer limit block (10) matched with the opened valve plate (2).

4. A low leakage square round interface single plate check valve according to claim 1, characterized in that: A first bearing base (12) with a first bearing (11) thereon and a second bearing base (14) with a second bearing (13) thereon are respectively arranged on the front and rear sides of the valve body (1); a bearing cover (15) is fixedly connected to the first bearing base (12); the first bearing (11) is installed in the bearing cover (15); a bearing end cover (16) is fixedly connected to the second bearing base (14); the second bearing (13) is installed in the bearing end cover (16); the front end of the valve stem (3) passes through the axial hole of the first bearing base (12) to be connected to the first bearing (11); the rear end of the valve stem (3) passes through the axial hole of the second bearing base (14) to be connected to the second bearing (13); the front end of the valve stem (3) is also connected to a weight (4) located outside the bearing cover (15).

5. A low leakage square round interface single plate check valve according to claim 4, characterized in that: A first O-ring (17) is arranged between the front end of the bearing cover (15) and the valve stem (3), a second O-ring (18) is arranged between the rear end of the bearing cover (15) and the first bearing base (12), and a third O-ring (19) is arranged between the bearing end cover (16) and the second bearing base (14).

6. A low leakage square round interface single plate check valve according to claim 1, characterized in that: The valve plate (2) is fixedly connected to the valve stem (3) by means of a group of connecting rods (20) arranged at intervals.

7. A low leakage square round interface single plate check valve according to claim 6, characterized in that: The connecting rod (20) and the valve stem (3) are fixedly connected by means of a conical pin (21).

8. A low leakage square round interface single plate check valve according to claim 1, characterized in that: A protective cover (22) is provided on the valve body (1), and the heavy hammer (4) is located inside the protective cover (22).

9. A low leakage square round interface single plate check valve according to claim 1, characterized in that: A group of notches (23) are arranged at intervals on the outer sides of the first sealing ring (5) and the second sealing ring (7), respectively, and the notches (23) on the first sealing ring (5) and the notches (23) on the second sealing ring (7) are arranged alternately.

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