Air blower emptying valve capable of adjusting emptying flow

Abstract

The air blower emptying valve capable of adjusting the emptying flow comprises a valve body, a top cover, a base plate and a rubber cup, the valve body comprises an intercepting pipe and an outer annular cavity which is located on the outer side of the intercepting pipe and exceeds the upper tail end of the intercepting pipe, and a plurality of spaced exhaust holes are formed in the outer annular cavity. The rubber cup is located in a space formed by the top cover and the outer annular cavity and located above the intercepting pipe, a cavity formed between the top cover and the rubber cup is an upper cavity, a cavity formed between the rubber cup and the valve body is a lower cavity, the middle of the top cover is externally connected with a first air pipe communicated with the inner space of the upper cavity, and the middle of the top cover is externally connected with a second air pipe communicated with the inner space of the lower cavity. The other tail end of the first air pipe is externally connected with an electric control proportional valve, and a second air pipe is connected between the electric control proportional valve and the valve body. According to the air release valve, the air release amount can be adjusted at will according to requirements, and the requirement for use under any working condition is met.

Description

Technical fields:

[0001] This utility model relates to a blower vent valve that can adjust the venting flow rate, which belongs to the field of centrifugal blower technology. Background technology:

[0002] In practical applications, centrifugal blowers have a limited adjustable flow rate under certain speed or constant pressure conditions. Insufficient flow rate can cause the blower to surge, leading to severe vibration and equipment damage. When centrifugal blowers are used for bottom aeration in aquaculture, one blower typically supplies oxygen to dozens or even hundreds of ponds. Due to the specific nature of aquaculture, during periods of harvesting or disease outbreaks, the blower flow rate needs to be reduced in some ponds during pond cleaning. For example, if there are 100 ponds and 70 are harvested at a certain time, the blower's airflow needs to be adjusted to 30% of the original operating volume for the remaining 30 ponds. This can cause the blower to surge, requiring venting to increase the flow rate and ensure stable operation. Conventional blower vent valves have a fixed venting flow rate when open, but the venting flow rate required during aquaculture needs to be adjustable.

[0003] Therefore, this utility model proposes a blower vent valve that can adjust the venting flow rate. Utility model content:

[0004] This invention provides a blower vent valve that can adjust the venting flow rate in order to solve the problems existing in the prior art.

[0005] The technical solution adopted in this utility model is as follows: a blower vent valve that can adjust the venting flow rate, including a valve body, a top cover, a gasket, and a rubber cup. The valve body includes a cut-off pipe and an outer annular cavity located outside the cut-off pipe and extending beyond the upper end of the cut-off pipe. A plurality of spaced-apart exhaust holes are formed on the outer annular cavity. The rubber cup is located in the space formed by the top cover and the outer annular cavity and is located above the cut-off pipe. The cavity formed between the top cover and the rubber cup is the upper cavity, and the cavity formed between the rubber cup and the valve body is the lower cavity. A first air pipe communicating with the internal space of the upper cavity is connected to the middle position of the top cover. An electrically controlled proportional valve is connected to the other end of the first air pipe. A second air pipe is connected between the electrically controlled proportional valve and the valve body.

[0006] Furthermore, the top cover is located above the upper end of the outer annular cavity, and a pad is placed between the top cover and the upper end of the outer annular cavity. The top cover, the pad, and the valve body are installed together by bolts.

[0007] Furthermore, the rubber cup is an annular structure with a first mounting hole at its center. A retaining plate is installed on the upper and lower surfaces of the rubber cup at its center. A second mounting hole is provided in the middle of the retaining plate, which is aligned vertically with the first mounting hole. Bolts and nuts are screwed into the first and second mounting holes to install the rubber cup and retaining plate together.

[0008] Furthermore, the outer edge of the rubber cup is folded to form a snap-fit ​​portion, and a boss portion is protruding at the upper end of the outer annular cavity and located inside the pad to engage with the snap-fit ​​portion. The outer edge of the rubber cup is installed between the top cover and the valve body through the engagement of the snap-fit ​​portion and the boss portion.

[0009] Furthermore, the intercepting tube is detachably installed together with the outer annular cavity.

[0010] Furthermore, the top cover is provided with pressure relief pinholes.

[0011] This utility model has the following beneficial effects:

[0012] (1) Conventional vent valves only have two working states: fully closed and fully open. They are not suitable for working conditions with large adjustment requirements. The vent valve of this utility model can adjust the amount of air released according to the needs, so as to meet the use of any working condition.

[0013] (2). Conventional vent valves usually require changing the valve body diameter to meet different venting requirements with different parameters. The valve body of this utility model can meet different venting requirements with different flow rates and pressures by simply replacing the shut-off pipe. Attached image description:

[0014] Figure 1 This is a schematic diagram of the blower vent valve of the present invention, which can adjust the venting flow rate.

[0015] Figure 2 This is a schematic diagram showing pressure relief pinholes formed on the top cover.

[0016] Figure 3 for Figure 1 A schematic diagram showing the connection to the blower. Detailed implementation method:

[0017] The present invention will be further described below with reference to the accompanying drawings.

[0018] This utility model relates to an adjustable blower vent valve, comprising a valve body 1, a top cover 2, a gasket 3, and a rubber cup 4. The valve body 1 includes a throttling pipe 10 and an outer annular cavity 11 located outside the throttling pipe 10 and extending beyond its upper end. The outer annular cavity 11 has several spaced-apart exhaust holes 110. The top cover 2 is located above the upper end of the outer annular cavity 11, and a gasket 3 is placed between the top cover 2 and the upper end of the outer annular cavity 11. The top cover 2, gasket 3, and valve body 1 are bolted together (not shown). The throttling pipe 10 and the outer annular cavity 11 are detachably mounted together. The height of the throttling pipe 10 can be adjusted to match different blowers based on their maximum vent flow requirements.

[0019] The rubber cup 4 is located in the space formed by the top cover 2 and the outer annular cavity 11, and is positioned above the shut-off pipe 10. The rubber cup 4 is an annular structure with a first mounting hole 40 at its center. The outer edge of the rubber cup 4 is folded to form a snap-fit ​​part 41. At the upper end of the outer annular cavity 11, located inside the pad 3, a boss part 111 is protruding to engage with the snap-fit ​​part 41. Through the engagement of the snap-fit ​​part 41 and the boss part 111, the outer edge of the rubber cup 4 is installed between the top cover 2 and the valve body 1. The cavity formed between the top cover 2 and the rubber cup 4 is the upper cavity, and the cavity formed between the rubber cup 4 and the valve body 1 is the lower cavity.

[0020] A retaining plate 5 is installed on the upper and lower surfaces of the rubber cup 4 at its center. A second mounting hole 50, aligned vertically with the first mounting hole 40, is provided in the middle of the retaining plate 5. Bolts and nuts are screwed into the first and second mounting holes 40 to secure the rubber cup 4 and the retaining plate 5 together. The main function of the retaining plate 5 is to prevent the bottom surface of the rubber cup 4 from developing a conical deformation when deformed. A conical deformation would lead to poor sealing when the rubber cup 4 contacts the throttling pipe 10, resulting in air leakage when the vent valve is closed.

[0021] The top cover 2 is connected to the middle position of a first air pipe 6 that communicates with the interior space of the upper chamber. The other end of the first air pipe 6 is connected to an electronically controlled proportional valve 7. The electronically controlled proportional valve 7 is connected to the valve body 1 by a second air pipe 8.

[0022] This utility model is a blower vent valve that can adjust the venting flow rate. The working principle is as follows: the valve body 1 is connected to the outlet pipe of the blower. When the blower is running, the lower chamber is connected to the outlet pipe. When the vent valve is closed, the pressure in the lower chamber is the same as the pressure in the outlet pipe, which is P1. When the electronically controlled proportional valve 7 is fully open, the pressure in the upper chamber is P2. At this time, the pressure-bearing area of ​​the lower chamber is S1 (i.e., the area inside the throttling pipe 10, while the airflow between the rubber cup 4 and the outer annular cavity 11 will be depressurized due to the presence of the exhaust port 110), and the pressure-bearing area of ​​the upper chamber is S2. Then, the forces on the upper and lower surfaces of the rubber cup 4 are N1 = S1 * P1 and N2 = S2 * P2, respectively. Since P1 ≈ P2 and S2 is greater than S1, the rubber cup 4 is deformed downward under pressure. When the rubber cup 4 deforms downward and contacts the throttling pipe 10, the vent valve is completely closed. At this time, the elastic force generated by the deformation of the rubber cup 4 is N3. Ensuring that N2 > N1 + N3 can ensure that the valve body can be completely sealed when it needs to be closed.

[0023] When the vent valve needs to be opened for venting, the electronically controlled proportional valve 7 is fully closed, disconnecting the passage between the upper and lower chambers. Since the top cover 2 is equipped with a pressure relief pinhole, the pressure will gradually decrease to the same level as atmospheric pressure without any air supply. At this time, the pressure in the upper chamber drops rapidly to the same level as atmospheric pressure, and the force on the upper surface of the rubber cup 4 also drops rapidly to zero. At this time, due to the constant high-pressure air supply in the lower chamber, pressure is generated on the lower surface of the rubber cup 4. At this time, N2 < N1, and the rubber cup 4 will generate the maximum amount of upward deformation. At this time, the vent valve reaches the fully open state, and the amount of air released reaches the maximum.

[0024] When aquaculture blowers are running, the water level in the tank remains constant, resulting in a constant operating pressure. When venting is required, the gas at constant pressure P0 is considered to be discharged into the atmosphere via a throttling process. Gas with a pressure of 10-50 kPa is discharged into the atmosphere after throttling. This gas can be simplified as incompressible, and its pressure can be considered to drop from P0 to 0, with all of it converted into kinetic energy, E0 = 1 / 2ρV0. 2 ρ is the air density, and V0 is the air velocity at the cutoff surface. Therefore, we can simplify and assume that the gas velocity at the cutoff point is constant. The gas flow rate through a given cutoff area S is Q = S * V0. The gas flow rate through the cutoff area can be controlled by adjusting the cutoff area S, where the cutoff area S = h * 2πR. The outer diameter R of the cutoff pipe is a fixed value; therefore, to control the change in the cutoff area, we only need to control the cutoff height h.

[0025] When the vent valve is operating at its maximum opening, adjust the electronically controlled proportional valve 7 to a certain opening. At this time, the upper chamber and the lower chamber are connected, and the pressure in the upper chamber will gradually increase. Due to the presence of the pressure relief pinhole 20 on the top cover 2, the pressure in the upper chamber will be lower than that in the lower chamber. As the pressure gradually increases, the force on the upper surface of the rubber cup 4 will gradually increase, while the force on the lower surface remains unchanged. The rubber cup 4 will deform downwards to reach an equilibrium point, and the vent flow rate will be adjusted to a certain value.

[0026] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements can be made without departing from the principle of the present utility model, and these improvements should also be considered within the protection scope of the present utility model.

Claims

1. A blower vent valve capable of regulating vent flow, characterized by: The valve body (1) includes a cutoff pipe (10) and an outer annular cavity (11) outside the cutoff pipe (10) and beyond the upper end of the cutoff pipe (10), a plurality of spaced apart exhaust holes (110) are formed on the outer annular cavity (11), the rubber skin bowl (4) is located in the space formed by the top cover (2) and the outer annular cavity (11) and above the cutoff pipe (10), the chamber formed between the top cover (2) and the rubber skin bowl (4) is an upper chamber, the chamber formed between the rubber skin bowl (4) and the valve body (1) is a lower chamber, a first air pipe (6) penetrating the internal space of the upper chamber is circumscribed at the middle position of the top cover (2), the other end of the first air pipe (6) is circumscribed with an electric control proportional valve (7), and the electric control proportional valve (7) is connected with the valve body (1) through a second air pipe (8).

2. The blower vent valve with adjustable vent flow of claim 1, wherein: The top cover (2) is above the upper end of the outer annular cavity (11), and the gasket (3) is placed between the top cover (2) and the upper end of the outer annular cavity (11), and the top cover (2), the gasket (3) and the valve body (1) are bolted together.

3. The blower vent valve with adjustable vent flow of claim 2, wherein: The rubber skin bowl (4) is a circular ring structure with a first mounting hole (40) in the center, and a retaining plate (5) is mounted on the upper surface and the lower surface of the center position of the rubber skin bowl (4), respectively, a second mounting hole (50) is formed in the middle position of the retaining plate (5) and is aligned with the first mounting hole (40) above and below, and the rubber skin bowl (4) and the retaining plate (5) are bolted together by screwing bolts and nuts into the first mounting hole (40) and the second mounting hole (50).

4. The blower vent valve with adjustable vent flow of claim 3, wherein: The outer side edge of the rubber skin bowl (4) is folded to form a buckle part (41), the upper end of the outer annular cavity (11) and the position inside the gasket (3) are protruded to form a boss part (111) matched with the buckle part (41), and the outer side edge of the rubber skin bowl (4) is installed between the top cover (2) and the valve body (1) through the cooperation of the buckle part (41) and the boss part (111).

5. The blower vent valve with adjustable vent flow of claim 1, wherein: The cutoff pipe (10) and the outer annular cavity (11) are detachably installed together.

6. The blower vent valve with adjustable vent flow of claim 1, wherein: The top cover (2) is provided with a pressure relief pinhole.

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