Novel check air valve

Abstract

The utility model discloses a novel non-return air valve, and belongs to the field of ventilation pipelines, the non-return air valve comprises a valve body, the two ends of the valve body are an air inlet port and an air outlet port respectively, and a limiting check ring is fixedly installed on the inner wall of the end, close to the air inlet port, of the valve body; valve plates are symmetrically arranged in the valve body through a rotating shaft, the valve plates are semicircular, and when the two valve plates make contact with the limiting check ring, a channel of the valve body is closed; the outer side of the valve body is provided with a balance weight structure which is connected with one end of the rotating shaft and used for enabling the valve plate to rotate to be close to the limiting check ring. The non-return air valve is simple in structure and wide in application, the driving force for closing the valve plate is increased through the balance weight structure, and the risk that the valve plate cannot be closed or is not tightly closed due to the fact that resistance is too large when the valve plate rotates to be closed can be effectively reduced.

Description

Technical Field

[0001] The present application relates to the technical field of ventilation ducts, and in particular to a novel check air valve. Background Art

[0002] In ventilation, smoke exhaust and other piping systems, in order to prevent backflow, a check valve needs to be installed in the piping system. Commonly used check valves generally rely on wind power to open, and the valve plate is closed by the weight of the valve plate itself; that is, when wind enters the valve body from the inlet end, the valve plate is opened by the wind; when no wind enters the valve body, the valve plate is closed by the gravity of the valve plate itself. However, when used in an environment containing impurities such as dust, the rotating axis of the valve plate is very likely to be difficult to rotate due to dust or gel accumulation, and the valve plate is easily closed loosely or cannot be closed due to excessive rotation resistance when it is completely closed by the weight of the valve plate itself.

[0003] Therefore, the present application provides a new type of check air valve to solve the above problems. Utility Model Content

[0004] The present application provides a novel check air valve, which aims to solve the problem in the background art that the existing check air valve relies on the weight of the valve plate to close, and is prone to loose closure or failure to close.

[0005] To achieve the above-mentioned purpose, the present application provides a new type of non-return air valve. The non-return air valve includes a valve body, the two ends of the valve body are respectively an air inlet port and an air outlet port, and a limit retaining ring is fixedly installed on the inner wall of one end of the valve body close to the air inlet port; the interior of the valve body is symmetrically provided with valve plates through a rotating shaft, and the valve plates are semicircular, and the passage of the valve body is closed when the two valve plates contact the limit retaining ring; the outer side of the valve body is provided with a counterweight structure connected to one end of the rotating shaft for rotating the valve plate close to the limit retaining ring. In this way, the driving force for closing the valve plate is increased by the counterweight structure, thereby reducing the risk that the valve plate cannot be closed or is not closed tightly due to excessive resistance when rotating and closing.

[0006] Preferably, the two counterweight structures are respectively arranged at ends of the two rotating shafts that are away from each other.

[0007] Preferably, a pressure gauge for detecting the air inlet pressure is fixedly installed on the valve body at a position corresponding to the air inlet port.

[0008] In order to improve the flexibility of the use of the check valve, preferably, the counterweight structure includes a rocker arm arranged on the outside of the valve body and fixedly connected to one end of the rotating shaft, at least two counterweight blocks mounted on the end of the rocker arm away from the rotating shaft, and limit bolts screwed on the rocker arm at the positions of both ends corresponding to the counterweight blocks. In this way, the gravity of the counterweight structure can be adjusted according to the pressure of the air inlet port, and the gravity of the counterweight structure can be adjusted by assembling the counterweight blocks as needed, thereby adjusting the driving force of the valve plate closing according to the pressure of the air inlet port, ensuring the driving force of the valve plate closing, and improving the applicability of the check valve.

[0009] Preferably, a limiting rod is fixedly installed inside one end of the valve body close to the air outlet port for limiting the ends of the two valve plates away from the rotating shaft from approaching each other.

[0010] Preferably, when the valve plate contacts the limiting rod, the two valve plates are parallel to each other.

[0011] The check air valve increases the driving force when the valve plate is closed by providing a counterweight structure, thereby reducing the risk of the valve plate being unable to rotate and close or not closing tightly due to excessive resistance when rotating and closing, thereby improving the stability of the check air valve.

[0012] The counterweight structure of the check air valve can adjust the weight of the counterweight structure according to the pressure of the air inlet port by setting a pressure gauge and a counterweight structure, so that the closing of the valve plate has sufficient driving force, which can effectively improve the applicability of the check air valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic diagram of the structure of the stop return air valve in the closed state in Example 1;

[0014] Figure 2 This is a schematic diagram of the structure of the stop return air valve in the open state in Example 1;

[0015] Figure 3 This is a schematic diagram of the structure of the stop return air valve in the closed state in Example 2;

[0016] Figure 4 This is a schematic diagram of the structure of the stop return air valve in the open state in Example 2.

[0017] In the figure:

[0018] 1. Valve body;

[0019] 11. Air inlet port; 12. Air outlet port; 13. Limit retaining ring;

[0020] 2. Rotating shaft;

[0021] 3. Valve plate;

[0022] 4. Counterweight structure;

[0023] 41. Rocker arm; 42. Counterweight; 43. Locking bolt;

[0024] 5. Pressure gauge;

[0025] 6. Limit rod. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0027] Example 1

[0028] This embodiment provides a new type of check valve. Figure 1 and Figure 2 As shown, the check valve includes a valve body 1, the two ends of the valve body 1 are respectively an air inlet port 11 and an air outlet port 12, and a limit retaining ring 13 is fixedly installed on the inner wall of one end of the valve body 1 close to the air inlet port 11; the valve plates 3 are symmetrically arranged inside the valve body 1 through the rotating shaft 2, and the valve plates 3 are semicircular. When the two valve plates 3 contact the limit retaining ring 13, the passage of the valve body 1 is closed; the outer side of the valve body 1 is provided with a counterweight structure 4 connected to one end of the rotating shaft 2 for rotating the valve plate 3 close to the limit retaining ring 13, and the air inlet pressure of the air inlet port 11 is at least greater than the gravity of the counterweight structure 4. In order to avoid mutual interference between the two counterweight structures 4 when they are in action, the two counterweight structures 4 are respectively arranged at one end of the two rotating shafts 2 away from each other.

[0029] When in use, when wind enters the valve body 1 through the air inlet port 11, the two valve plates 3 are pushed to overcome their own weight and the gravity of the counterweight structure 4 and rotate away from the limit retaining ring 13 under the action of wind force, so that the valve plates 3 are opened, and the wind is discharged from the air outlet port 12 of the valve body 1; and when there is no wind entering the air inlet port 11, under the action of the gravity of the counterweight structure 4 and the gravity of the valve plate 3 itself, the valve plate 3 is reversely rotated close to the limit retaining ring 13, and when the valve plate 3 contacts the limit retaining ring 13, the passage of the valve body 1 is closed, thereby closing the check valve. Among them, the driving force for closing the valve plate 3 is increased by the counterweight structure 4, and the risk of the valve plate 3 not closing tightly or failing to close due to excessive resistance when the valve plate 3 is closed and rotated is reduced.

[0030] Specifically, the counterweight structure 4 includes a rocker arm 41 disposed on the outside of the valve body 1 and fixedly connected to one end of the rotating shaft 2, at least two counterweight blocks 42 mounted on the end of the rocker arm 41 away from the rotating shaft 2, and limit bolts 43 screwed on the rocker arm 41 at the positions at both ends corresponding to the counterweight blocks 42; wherein, a pressure gauge 5 for detecting the air inlet pressure is fixedly installed at the position corresponding to the air inlet port 11 on the valve body 1. The air inlet pressure of the check valve is detected by the pressure gauge 5, and the weight of the counterweight structure 4 can be adjusted by the pressure of the air inlet port of the check valve during installation.

[0031] Example 2

[0032] Different from Example 1, Figure 3 and Figure 4 As shown, a limiting rod 6 is fixedly installed inside the end of the valve body 1 close to the air outlet port 12, which is used to limit the two valve plates 3 from approaching each other at one end away from the rotating shaft 2. When the valve plates 3 are in contact with the limiting rod 6, the two valve plates 3 are parallel to each other. During exhaust, when the non-return air valve is fully opened, the limiting rod 6 limits the rotation angle of the valve plates 3, so that the valve plates 3 are in a parallel state, so as to avoid excessive rotation angle of the valve plates 3 due to excessive inlet pressure, thereby affecting the opening of the non-return air valve.

[0033] The above is only a preferred specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can make equivalent substitutions or changes according to the technical solution and concept of the present application within the technical scope disclosed in the present application, which should be covered by the protection scope of the present application.

Claims

1. A novel check air valve, comprising a valve body (1), wherein two ends of the valve body (1) are respectively an air inlet port (11) and an air outlet port (12); the characteristics are: A limit stop ring (13) is fixedly mounted on the inner wall of one end of the valve body (1) close to the air inlet port (11); The valve body (1) is internally provided with valve plates (3) symmetrically via a rotating shaft (2); the valve plates (3) are semicircular in shape, and when the two valve plates (3) are in contact with the limit retaining ring (13), the passage of the valve body (1) is closed; and the outer side of the valve body (1) is provided with a counterweight structure (4) connected to one end of the rotating shaft (2) for rotating the valve plates (3) close to the limit retaining ring (13).

2. The novel check air valve according to claim 1 is characterized in that: The two counterweight structures (4) are respectively arranged at ends of the two rotating shafts (2) that are away from each other.

3. The novel check air valve according to claim 2 is characterized in that: A pressure gauge (5) for detecting air inlet pressure is fixedly mounted on the valve body (1) at a position corresponding to the air inlet port (11).

4. The novel check air valve according to claim 3 is characterized in that: The counterweight structure (4) comprises a rocker arm (41) arranged on the outer side of the valve body (1) and fixedly connected to one end of the rotating shaft (2), at least two counterweight blocks (42) sleeved on one end of the rocker arm (41) away from the rotating shaft (2), and limit bolts (43) screwed on the rocker arm (41) at the two end positions corresponding to a plurality of the counterweight blocks (42).

5. The novel check air valve according to claim 1 is characterized in that: A limiting rod (6) is fixedly installed inside one end of the valve body (1) close to the air outlet port (12) and is used to limit the ends of the two valve plates (3) away from the rotating shaft (2) from approaching each other.

6. The novel check air valve according to claim 5 is characterized in that: When the valve plate (3) is in contact with the limiting rod (6), the two valve plates (3) are parallel to each other.

Images