A new type of air damper device for Venturi valve

Abstract

The present invention is applicable to the technical field of Venturi valves, and provides a novel air damper device for Venturi valves, including a cylinder body slidably mounted on the Venturi valve shaft, a valve cone mounted on the cylinder body, a pressure compensation spring and a piston mounted inside the cylinder body, and the inner diameter of the cylinder body is larger than the diameter of the piston, the pressure compensation spring is sleeved on the Venturi valve shaft, one end of the pressure compensation spring is connected to the piston, and the end of the pressure compensation spring away from the piston is connected to the inner wall of the cylinder body, and a counter-air channel is provided on the piston. The device is designed so that the cylinder body and the piston are non-contact, an air gap is left, and no mechanical seal lubrication is required; the piston length is increased, the flow resistance of the air gap leakage airflow along the way is increased, the leakage airflow is reduced, and the counter-airflow is formed through the cooperation of the air flow channel and the counter-air hole, forming resistance to the air flowing out of the air gap, reducing and preventing cylinder air leakage.

Description

Technical Field

[0001] The invention belongs to the technical field of Venturi valves, and in particular relates to an air damper device of a novel Venturi valve. Background Art

[0002] The Venturi valve is an important and critical airflow control device in risky airflow environments. Ensuring a constant air volume under different pipeline pressures is its most important airflow control performance. An air damper is installed inside the valve cone of the Venturi valve. Its function is to eliminate the oscillation of the pressure compensation spring when the system pressure fluctuates. The air damper adopts a cylinder and piston structure, and its air resistance / pressure is proportional to the movement speed of the piston.

[0003] However, due to the semi-open structure of the valve cone of the Venturi valve, its air damper cannot adopt the common closed air damper cylinder and piston lubrication and sealing technology. Due to the objective limitations of materials and processing technology, lubrication cannot be achieved. Instead, due to the semi-open structure of the valve cone, pollution or sediment may enter after long-term operation, causing the air damper to become blocked and fail. At the same time, due to the static friction of the air damper, there is a large return stroke difference in the pressure-independent compensation process of the Venturi valve. Summary of the invention

[0004] The purpose of the embodiment of the present invention is to provide a novel air damper device for a Venturi valve, aiming to solve the problem that the valve cone of the existing Venturi valve enters into pollution or sediment after long-term operation, causing the air damper to be blocked and fail, and at the same time, due to the static friction of the air damper, there is a large out-and-back stroke difference in the pressure-independent compensation process of the Venturi valve.

[0005] An embodiment of the present invention is implemented as follows: an air damper device for a novel Venturi valve comprises a cylinder body slidably mounted on a Venturi valve shaft, a valve cone being mounted on the cylinder body, a pressure compensation spring and a piston being mounted inside the cylinder body, and an inner diameter of the cylinder body being larger than a diameter of the piston, the pressure compensation spring being sleeved on the Venturi valve shaft, one end of the pressure compensation spring being connected to the piston, and an end of the pressure compensation spring away from the piston being connected to the inner wall of the cylinder body, and a counter-air channel being provided on the piston.

[0006] According to a further technical solution, sliding bearings are provided at both ends of the cylinder body along the axial direction of the Venturi valve shaft, and the cylinder body is cooperatively connected to the Venturi valve shaft via the sliding bearings.

[0007] A further technical solution is that the counter-air channel includes an air flow channel and a counter-air hole, the air flow channel is opened on the two end faces of the piston, the counter-air hole is opened on the side wall of the piston, and the air flow channel forms a complete channel by being interconnected with a corresponding counter-air hole.

[0008] According to a further technical solution, the air flow channel is an annular cavity.

[0009] According to a further technical solution, the piston is provided with a plurality of counter-air holes arranged side by side along its length direction, and the counter-air holes are connected with the air flow passages closer thereto according to the proximity principle.

[0010] The embodiment of the present invention provides a novel air damper device for a Venturi valve, which has the following beneficial effects:

[0011] 1. The air damper is designed so that the cylinder and the piston have no contact, leaving an air gap and no mechanical seal lubrication is required;

[0012] 2. The piston length is increased, which increases the flow resistance of the air gap leakage air flow along the way and reduces the leakage air flow;

[0013] 3. Air channels are designed at both ends of the piston. During the compression or expansion of the piston, the counter-flow holes designed on the side wall of the piston are connected to the air channels. During the compression or expansion of the piston, part of the air flows into the air channels, and part of the air flows out from the counter-flow holes, forming counter-flows, which form resistance to the air flowing out of the air gap, reducing and preventing cylinder air leakage;

[0014] 4. Sliding bearings are used to connect the two ends of the cylinder body and the Venturi valve shaft to ensure a non-contact structure between the cylinder body and the piston. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A schematic structural diagram of an air damper device of a novel Venturi valve provided by an embodiment of the present invention;

[0016] Figure 2 A front view of a piston in an air damper device of a novel venturi valve provided by an embodiment of the present invention;

[0017] Figure 3 A side view of a piston in an air damper device of a novel venturi valve provided in an embodiment of the present invention.

[0018] In the attached drawings: Venturi valve shaft 1; valve cone 2; cylinder body 3; pressure compensation spring 4; piston 5; counter-pressure air channel 6; air flow channel 61; counter-pressure air hole 62; sliding bearing 7. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0020] The specific implementation of the present invention is described in detail below in conjunction with specific embodiments.

[0021] like Figure 1-3 As shown, a new type of air damper device for a Venturi valve provided by an embodiment of the present invention includes a cylinder body 3 slidably mounted on a Venturi valve shaft 1, a valve cone 2 is mounted on the cylinder body 3, a pressure compensation spring 4 and a piston 5 are mounted inside the cylinder body 3, and the inner diameter of the cylinder body 3 is larger than the diameter of the piston 5, the pressure compensation spring 4 is sleeved on the Venturi valve shaft 1, one end of the pressure compensation spring 4 is connected to the piston 5, and the end of the pressure compensation spring 4 away from the piston 5 is connected to the inner wall of the cylinder body 3, and a counter-air channel 6 is opened on the piston 5.

[0022] In the embodiment of the present invention, by designing the inner diameter of the cylinder body 3 to be larger than the diameter of the piston 5, it is ensured that the cylinder body 3 and the piston 5 are not in contact, an air gap is left, and no mechanical seal lubrication is required. The counter-air channel 6 includes an air flow channel 61 and a counter-air hole 62, the air flow channel 61 is opened on the two end faces of the piston 5, and the air flow channel 61 is an annular cavity, the counter-air hole 62 is opened on the side wall of the piston 5, and the piston 5 is provided with a plurality of counter-air holes 62 arranged side by side along its length direction, and the counter-air holes 62 are connected with the air flow channel 61 closer to it according to the principle of proximity, and the air flow channel 61 forms a complete channel by being interconnected with a corresponding counter-air hole 62. By designing the air flow channel 61 on the piston 5, during the compression or expansion of the piston, part of the air flows into the air flow channel 61, and then part of the air flows out through the counter-air hole 62, forming a counter-air flow, forming resistance to the air flowing out of the air gap, reducing and preventing cylinder air leakage.

[0023] like Figure 1 As shown, as a preferred embodiment of the present invention, sliding bearings 7 are provided at both ends of the cylinder body 3 along the axial direction of the Venturi valve shaft 1, and the cylinder body 3 is connected to the Venturi valve shaft 1 through the sliding bearings 7. By using sliding bearings 7 or similar mechanical structure supports as a connection between the cylinder body 3 and the Venturi valve shaft 1, a non-contact structure between the cylinder body 3 and the piston 5 is ensured.

[0024] like Figure 1 and 3 As shown, as a preferred embodiment of the present invention, the length of the piston 5 is longer than that of a conventional piston, thereby increasing the flow resistance of the air gap leakage airflow along the way and reducing the leakage airflow.

[0025] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A novel air damper device for a venturi valve, comprising a cylinder body slidably mounted on a venturi valve shaft, characterized in that: A valve cone is installed on the cylinder body, a pressure compensation spring and a piston are installed inside the cylinder body, and the inner diameter of the cylinder body is larger than the diameter of the piston. The pressure compensation spring is sleeved on the Venturi valve shaft, one end of the pressure compensation spring is connected to the piston, and the end of the pressure compensation spring away from the piston is connected to the inner wall of the cylinder body, and a counter-air channel is opened on the piston; The counter-air passage comprises an air passage and a counter-air hole, wherein the air passage is provided on two end surfaces of the piston, the counter-air hole is provided on the side wall of the piston, and the air passage is connected with a corresponding counter-air hole to form a complete passage; The air flow channel is an annular cavity.

2. The novel air damper device for a Venturi valve according to claim 1 is characterized in that: Both ends of the cylinder body along the axial direction of the Venturi valve shaft are provided with sliding bearings, and the cylinder body is matched and connected with the Venturi valve shaft through the sliding bearings.

3. The novel air damper device for a Venturi valve according to claim 1 is characterized in that: The piston is provided with a plurality of counter-air holes arranged side by side along the length direction thereof, and the counter-air holes are connected with the air flow passage closer thereto according to the principle of proximity.

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