A venting system for preventing surge in a centrifugal blower

Abstract

The utility model belongs to centrifugal blower field, concretely relates to a kind of venting system for preventing centrifugal blower surge, comprising: fan pipeline, venting valve main body, venting outlet, two-position two-way electromagnetic valve and gas supply pipeline, the fan pipeline is connected with the air outlet of blower, the venting valve main body is connected in the side portion of the fan pipeline, the venting outlet is connected in the upper portion of the venting valve main body, the bottom of the venting valve main body is provided with tee, the lower part of the venting valve main body is connected with the gas supply pipeline and the two-position two-way electromagnetic valve by tee, the other end of the gas supply pipeline is connected with fan pipeline, the venting outlet is provided with muffler. The device replaces the conventional two-position three-way electromagnetic valve by using two-position two-way electromagnetic valve, saves cost to achieve the same venting valve operating effect, avoids the surge phenomenon of centrifugal blower.

Description

Technical Field

[0001] This utility model relates to the field of centrifugal blowers, and specifically to a venting system for preventing surge in centrifugal blowers. Background Technology

[0002] In the industrial sector, blowers (especially centrifugal or axial blowers) are widely used in ventilation, pneumatic conveying, and gas compression. However, when the blower's operating conditions deviate from the design range (such as insufficient flow or sudden changes in system resistance), surge is highly likely to occur. Surge can cause periodic airflow pulsations, severe pressure fluctuations, and even equipment vibration, noise, and blade damage, seriously threatening system safety and equipment lifespan. Therefore, vent valves are needed to address these issues. Existing technologies often use two-position three-way solenoid valves to control the airflow entering the vent valve, thus opening and closing it. However, this method requires strict control over the airflow volume; otherwise, the vent valve will fail, and the structure will be unstable.

[0003] Therefore, in order to solve the above-mentioned problems, a venting system for preventing surge in centrifugal blowers is proposed. Utility Model Content

[0004] This utility model addresses the problems mentioned above by designing a venting system to prevent surge in centrifugal blowers. This device replaces the traditional two-position three-way solenoid valve with a two-position two-way solenoid valve, saving costs while achieving the same venting valve operation effect and preventing surge in centrifugal blowers.

[0005] To achieve the above objectives, this utility model provides a venting system for preventing surge in a centrifugal blower, comprising: a blower duct, a venting valve body, a venting outlet, a two-position two-way solenoid valve, and an air supply duct. The blower duct is connected to the air outlet of the blower. The venting valve body is connected to the side of the blower duct. The venting outlet is connected to the upper part of the venting valve body. A tee is provided at the bottom of the venting valve body. The lower part of the venting valve body is connected to the air supply duct and the two-position two-way solenoid valve via the tee. The other end of the air supply duct is connected to the blower duct. A silencer is provided on the venting outlet.

[0006] Furthermore, the vent valve body includes a limiting sleeve, a cover, and a vent hole. The limiting sleeve is fixedly connected to the bottom of the vent valve body, the cover is slidably connected inside the limiting sleeve, and an exhaust port is provided on the upper part of the vent valve body. The outer diameter of the cover is larger than the diameter of the exhaust port, and the vent hole is provided on the cover.

[0007] Furthermore, it also includes a support structure, which is an elastic telescopic structure, located at the bottom of the vent valve body, with its top end abutting against the underside of the cover.

[0008] Furthermore, the support structure includes an elastic element, which is a tower-shaped spring structure. The large-diameter end of the elastic element is placed at the bottom of the vent valve body, and the small-diameter end abuts against the bottom of the cover.

[0009] In this way, when the vent valve is closed, the elastic element can assist the cover to rise quickly and seal the vent.

[0010] Furthermore, it also includes a sealing device, which is slidably connected to the top of the cover and connected to the vent hole.

[0011] Furthermore, the sealing device includes: a sliding sleeve, a stop bar, a sliding groove, a magnetic part, and a magnetic block. The sliding sleeve is slidably connected to the top of the cover. The inner wall of the sliding sleeve is provided with the stop bar. The outer wall of the cover is provided with the sliding groove. The stop bar is slidably connected to the inside of the sliding groove. The magnetic part is provided at the top of the sliding sleeve. The magnetic block is fixedly connected to the top of the vent valve body.

[0012] In this way, when the vent valve is closed, the sleeve is rising and the sliding sleeve is pressing against the top of the vent valve. As the sleeve rises, the position of the sliding sleeve relative to the sleeve falls, thus blocking the vent hole below. When the sleeve rises to the highest point, the vent hole is completely blocked, thus improving its internal sealing. Under the action of airflow, the sleeve can more stably block the exhaust port.

[0013] Furthermore, the top of the limiting sleeve is provided with an inwardly protruding limiting platform, and the bottom of the sleeve cover is provided with an outwardly protruding back rib. When the sleeve cover is raised, the back rib abuts against the limiting sleeve.

[0014] In summary, this utility model has the following advantages and beneficial technical effects: 1. This utility model provides a venting system for preventing surge in centrifugal blowers, which has a faster response, lower price, and more reliable performance; it automatically vents upon power failure, making it safer and more reliable, and the venting insurance remains effective even if the entire blower suddenly loses power. 2. The venting system of this utility model for preventing surge in centrifugal blowers can close the venting valve more quickly through the support structure; 3. The venting system of this utility model for preventing surge in centrifugal blowers can provide a more stable support effect when the venting valve is closed by using a sealing device. Attached Figure Description

[0015] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is a schematic diagram of the structure of a venting system for preventing surge in a centrifugal blower according to the present invention; Figure 2 This is a schematic diagram of the internal structure of a venting system for preventing surge in a centrifugal blower according to this utility model. Figure 3 This is a front view of the present invention; Figure 4 This is a utility model Figure 2 Enlarged view of A in the middle; Figure 5 This is a utility model Figure 2 Enlarged view of B in the middle; Figure 6 This is a schematic diagram of the elastic component of this utility model.

[0016] The reference numerals in the attached figures are: 1- Fan duct; 2-Vent valve body; 21-Air inlet; 22-Exhaust outlet; 23-Limit sleeve; 231-Limit platform; 24-Cover; 241-Back rib; 25-Vent hole; 26-Support structure; 261-Elastic element; 27-Sealing device; 271-Sliding sleeve; 272-Stop lever; 273-Slide groove; 274-Magnetic part; 275-Magnetic block; 3-Vent outlet; 4-Two-position two-way solenoid valve; 5-Gas supply pipeline. Detailed Implementation

[0017] The following is in conjunction with the appendix Figures 1-6 The present invention will be further described in detail below. Examples of embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar components or components having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0018] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection or a detachable connection; a mechanical connection or an electrical connection; a direct connection or an indirect connection through an intermediate medium; or the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0019] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used solely for ease of description and simplification of operation, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first" and "second" are merely used for descriptive distinction and have no special meaning. All parts and equipment use conventional models found in the prior art, and the circuit connections employ conventional connection methods found in the prior art, which will not be detailed here. Content not described in detail in this specification belongs to prior art known to those skilled in the art.

[0020] like Figure 1 and Figure 2 As shown, it includes: a fan duct 1, a vent valve body 2, a vent outlet 3, a two-position two-way solenoid valve 4, and an air supply duct 5. The fan duct 1 is connected to the air outlet of the blower. The vent valve body 2 is connected to the side of the fan duct 1 through a duct. The vent outlet 3 is connected to the upper part of the vent valve body 2. The bottom of the vent valve body 2 is an air inlet 21. A tee is provided on the air inlet 21. The lower part of the vent valve body 2 is connected to the air supply duct 5 and the two-position two-way solenoid valve 4 through a tee connected to the air inlet 21. The other end of the air supply duct 5 is connected to the fan duct 1. A silencer is provided on the vent outlet 3.

[0021] like Figure 2 and Figure 5 As shown, the vent valve body 2 includes a limiting sleeve 23, a cover 24, and a vent hole 25. The limiting sleeve 23 is fixedly connected to the bottom of the vent valve body 2, and the cover 24 is slidably connected inside the limiting sleeve 23. An exhaust port 22 is provided at the top of the vent valve body 2. The outer diameter of the cover 24 is larger than the diameter of the exhaust port 22. Four vent holes 25 are provided on the cover 24, evenly distributed on the cover 24. The top of the limiting sleeve 23 is integrally formed with an inwardly protruding limiting platform 231, and the bottom of the cover 24 is integrally formed with an outwardly protruding back rib 241. When the cover 24 is raised, the back rib 241 abuts against the limiting sleeve 23.

[0022] like Figure 1 and Figure 3 As shown, it also includes a support structure 26, which is an elastic telescopic structure. The support structure 26 is located at the bottom of the vent valve body 2, and its top end abuts against the bottom of the cover 24.

[0023] like Figure 3 and Figure 6As shown, the support structure 26 includes a spring element 261, which is a tower-shaped spring structure. The large-diameter end of the spring element 261 is placed at the bottom of the vent valve body 2, and the small-diameter end abuts against the bottom of the cover 24. The bottom of the spring element 261 does not block the air inlet 21, and the gas introduced through the air inlet 21 can effectively enter the inner cavity.

[0024] like Figure 1 and Figure 4 As shown, it also includes a sealing device 27, which is slidably connected to the top of the cover 24 and connected to the vent 25. The sealing device 27 includes: a sliding sleeve 271, a stop bar 272, a sliding groove 273, a magnetic part 274, and a magnetic block 275. The magnetic part 274 is an iron block that can be affected by magnetic force, and the magnetic block 275 is a permanent magnet with magnetic force. The sliding sleeve 271 is slidably connected to the top of the cover 24. The stop bar 272 is provided on the inner wall of the sliding sleeve 271 by welding. The sliding groove 273 is opened on the outer wall of the cover 24. The stop bar 272 is slidably connected to the inside of the sliding groove 273. The stop bar 272 cannot be horizontally displaced in the sliding groove 273, but can move in the vertical direction. The magnetic part 274 is provided on the top of the sliding sleeve 271 by adhesive. The magnetic block 275 is embedded and adhered to the top of the vent valve body 2. When the cover 24 moves down, the magnetic part 274 and the magnetic block 275 remain connected under the action of magnetic force, so the sliding sleeve 271 remains stationary. After the vent hole 25 is fully opened, the stop lever 272 is limited by the sliding groove 273, so it overcomes the magnetic force under the action of pulling force and the cover 24 continues to move down.

[0025] The working principle of this utility model is as follows: When the centrifugal fan starts (pressure boosting stage) or stops (pressure relief stage), the venting system needs to be opened. At this time, the fan is in the blowing state. The two-position two-way solenoid valve 4 is normally open and cannot be energized. Therefore, the solenoid valve opens, and the inside of the venting valve is connected to the atmosphere. The pressure inside the valve core is lower than the pressure in the pipeline and the outer cavity of the venting valve. Under the action of the pipeline pressure, the cover 24 overcomes the elastic force of the elastic element 261 and moves down along the contour of the limiting sleeve 23. The gas inside the valve core is discharged through the air inlet 21 at the bottom of the valve body and the venting valve is opened. At this time, the gas in the main pipeline is discharged through the venting valve and the exhaust port 22, so as to achieve the purpose of venting the fan and preventing surge.

[0026] When the centrifugal fan reaches its operating pressure and needs to stop venting, the pressure in the main fan pipeline is greater than the network pressure. The 2-position 2-way solenoid valve 4 is energized and closed. At this time, the bottom of the vent valve body 2 is only connected to an external air source. Air is drawn from the outlet pipe tee, passes through a high-temperature resistant pipeline, and enters the valve body through the inlet 21 at the bottom of the vent valve. Under the pressure of the internal cavity, the elastic force of the spring element 261 overcomes the downward pressure of the cover 24. The cover 24 rises along the contour of the limiting sleeve 23, closing the exhaust port 22, thus achieving the purpose of closing the vent valve. When the blower stops and there is no airflow, the spring element 261 uses its elastic force to push the cover 24 up, closing the exhaust port 22.

[0027] The above are all preferred embodiments of this utility model, and are not intended to limit the scope of protection of this utility model. Therefore, all equivalent changes made to the structure, shape and principle of this utility model should be covered within the scope of protection of this utility model.

Claims

1. A venting system for preventing surge in a centrifugal blower, characterized in that, include: The fan duct (1), the vent valve body (2), the vent outlet (3), the two-position two-way solenoid valve (4), and the air supply duct (5) are provided. The fan duct (1) is connected to the air outlet of the blower. The vent valve body (2) is connected to the side of the fan duct (1). The vent outlet (3) is connected to the upper part of the vent valve body (2). A three-way valve is provided at the bottom of the vent valve body (2). The lower part of the vent valve body (2) is connected to the air supply duct (5) and the two-position two-way solenoid valve (4) through the three-way valve. The other end of the air supply duct (5) is connected to the fan duct (1). A silencer is provided on the vent outlet (3).

2. The venting system for preventing surge in a centrifugal blower according to claim 1, characterized in that, The vent valve body (2) includes a limiting sleeve (23), a cover (24) and a vent hole (25). The limiting sleeve (23) is fixedly connected to the bottom of the vent valve body (2). The cover (24) is slidably connected inside the limiting sleeve (23). An exhaust port (22) is provided on the upper part of the vent valve body (2). The outer diameter of the cover (24) is larger than the diameter of the exhaust port (22). The vent hole (25) is provided on the cover (24).

3. A venting system for preventing surge in a centrifugal blower according to claim 2, characterized in that, It also includes a support structure (26), which is an elastic telescopic structure. The support structure (26) is located at the bottom of the vent valve body (2), and its top end abuts against the bottom of the cover (24).

4. A venting system for preventing surge in a centrifugal blower according to claim 3, characterized in that, The support structure (26) includes an elastic element (261), which is a tower-shaped spring structure. The large-diameter end of the elastic element (261) is placed at the bottom of the vent valve body (2), and the small-diameter end abuts against the bottom of the cover (24).

5. A venting system for preventing surge in a centrifugal blower according to claim 2, characterized in that, It also includes a sealing device (27) which is slidably connected to the top of the cover (24) and connected to the vent (25).

6. A venting system for preventing surge in a centrifugal blower according to claim 5, characterized in that, The sealing device (27) includes: a sliding sleeve (271), a stop bar (272), a sliding groove (273), a magnetic part (274), and a magnetic block (275). The sliding sleeve (271) is slidably connected to the top of the cover (24). The stop bar (272) is provided on the inner wall of the sliding sleeve (271). The sliding groove (273) is provided on the outer wall of the cover (24). The stop bar (272) is slidably connected to the inside of the sliding groove (273). The magnetic part (274) is provided on the top of the sliding sleeve (271). The magnetic block (275) is fixedly connected to the top of the vent valve body (2).

7. A venting system for preventing surge in a centrifugal blower according to claim 2, characterized in that, The top of the limiting sleeve (23) is provided with an inwardly protruding limiting platform (231), and the bottom of the cover (24) is provided with an outwardly protruding back rib (241). When the cover (24) is raised, the back rib (241) abuts against the limiting sleeve (23).

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