A centrifugal pump suction section self-venting module

Abstract

The utility model discloses a centrifugal pump suction section self -bleeding module, clamps in the pump body suction port and between import pipeline. Module body is equipped with the through suction passage, and the upper portion is integrally formed gas collection chamber, and the cavity top is equipped with automatic exhaust valve, and the gas collection chamber is provided with manual degassing / water injection interface, and the gas collection chamber is communicated with the channel through the communication opening located on the upper edge of the suction passage. The module both ends are provided with first flange connecting surface (connect with import pipeline) and second flange connecting surface (connect with pump body suction port) respectively, and when installing, can rotate positioning in the circumference, make automatic exhaust valve be at the highest place of the service suction section, to discharge a large amount of air in the starting stage, and continuously discharge air in the operation. The module does not need to change the pump body, and the structure is compact, and the installation and maintenance are convenient, can effectively reduce the air lock and cavitation risk caused by the gas collection of suction section, and improve the starting reliability and operation stability of pump.

Description

Technical Field

[0001] This utility model relates to the field of gas management and installation technology for centrifugal pump supporting pipelines, and in particular to a self-venting module for the suction section of a centrifugal pump. Background Technology

[0002] During the startup and operation of a centrifugal pump, air can easily accumulate in the suction section (between the pump body suction inlet and its upstream inlet pipeline) due to local high points or arching. Trapped air can cause cavitation at the first-stage impeller inlet, startup difficulties, and fluctuations in flow rate and head. On-site solutions typically involve modifying the pipeline slope, adding vents to the pump casing or pipeline, and manual venting. However, these measures depend on on-site construction conditions and operating procedures, the venting effect is significantly affected by installation posture and personnel operation, and maintenance is inconvenient.

[0003] To improve start-up reliability and operational stability, the proposed technical objective is to achieve automatic and manual dual-path venting in the suction section without altering the main pump body, and to facilitate modular modification and maintenance of existing units. Relevant existing technologies, such as CN101400896B, CN201206555Y, and CN202545271U, focus on self-venting pumps in whole-unit form or venting units located externally to the system. They do not integrate the air collection chamber, automatic venting valve, and manual venting / water injection interface into a clamp-on independent module between the pump suction inlet and inlet pipeline, thus requiring improvement in the versatility and convenience of on-site modification. Utility Model Content

[0004] The technical problem this invention aims to solve is to overcome the above-mentioned shortcomings and provide a self-venting module sandwiched between the pump inlet and the inlet pipeline. This module has a top-mounted air collection chamber on the upper part of its body, with an automatic venting valve at the top of the chamber, and a manual venting / water injection interface on the chamber. Through a connection structure with the upper part of the suction channel, free air in the suction section is preferentially collected and discharged via an automatic / manual path, thereby achieving controllable management of the venting process with simple installation and reducing modifications to the original pump body and existing pipelines.

[0005] To solve the above-mentioned technical problems, this utility model provides the following technical solution: This utility model discloses a self-venting module for the suction section of a centrifugal pump, comprising a module body 1 sandwiched between the pump body suction inlet and the inlet pipe, wherein a through suction channel 2 is formed within the module body 1; an air collecting chamber 3 is integrally formed on the upper part of the module body 1; an automatic venting valve 4 is installed on the top of the air collecting chamber 3; a manual venting / water filling interface 5 is provided on the air collecting chamber 3; the air collecting chamber 3 is connected to the upper part of the suction channel 2 via a connecting opening 6; a first flange connection surface 7 is provided at one end of the module body 1 for connecting to the inlet pipe; and a second flange connection surface 8 is provided at the other end of the module body 1 for connecting to the pump body suction inlet.

[0006] As a preferred technical solution of this utility model, the automatic exhaust valve 4 is a float-type or composite air valve. When needed, an anti-siphon component can be set at the exhaust end to achieve large-volume exhaust during startup and small-volume continuous exhaust during operation.

[0007] As a preferred technical solution of this utility model, the manual venting / water injection interface 5 adopts a threaded or quick-connect structure and can be connected to an external pipeline through a rotatable connector to facilitate on-site injection and manual venting.

[0008] As a preferred technical solution of this utility model, the connecting opening 6 is located in the upper edge region of the suction channel 2, and its edge is rounded or chamfered to promote the gas phase to float into the gas collection chamber 3 and reduce local eddies.

[0009] As a preferred technical solution of this utility model, the module body 1 can be circumferentially rotated and positioned relative to the axis of the inhalation channel 2, so that the automatic exhaust valve 4 is located at the highest point of the inhalation section it serves after installation.

[0010] As a preferred technical solution of this utility model, the module body 1 is a metal casting or welded part, and the material is carbon steel, ductile iron or stainless steel. A corrosion-resistant lining or anti-corrosion coating can be provided on the inner surface of the suction channel 2 according to the medium and working conditions.

[0011] Compared with the prior art, the beneficial effects of this utility model are as follows: 1. Easy on-site installation and modification: The first flange connection surface 7 of the module is used to connect with the inlet pipeline, and the second flange connection surface 8 is used to connect with the pump body suction port. It can be implemented without modifying the pump body casting. 2. More efficient exhaust: An air collection chamber 3 and an automatic exhaust valve 4 are set before the inlet of the first stage impeller, so that the air trapped in the upper part of the suction channel 2 is preferentially collected and discharged, which significantly reduces the risk of air lock and cavitation. 3. User-friendly operation and maintenance: The manual venting / water filling interface 5 facilitates pre-start priming and manual venting; the automatic valve can adaptively vent during operation, reducing manual intervention; 4. Strong installation adaptability: The module body can be rotated and positioned circumferentially to ensure that the valve is at the highest point of the suction section it serves, adapting to various site layouts and spaces; 5. Optional materials, reliable corrosion resistance: The body can be made of carbon steel, ductile iron or stainless steel, and can be equipped with anti-corrosion lining / coating to adapt to different media such as clean water and seawater. Attached Figure Description

[0012] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the appearance of this utility model; Figure 2 This is a longitudinal sectional view of the present invention; Figure 3 This is an installation diagram of this utility model; In the diagram: 1. Module body; 2. Suction channel; 3. Air collection chamber; 4. Automatic exhaust valve; 5. Manual air release / water injection interface; 6. Connecting opening; 7. First flange connection surface; 8. Second flange connection surface.

[0013] Note: For the sake of simplicity, conventional or optional components such as sealing gaskets, isolation valves, check valves, vent ports, and drain pipes are not shown in the accompanying drawings. These components are described in the preferred embodiments in the "Detailed Description" section and do not affect the understanding of this utility model. Detailed Implementation

[0014] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0015] In the attached diagram, all identical reference numerals refer to the same components.

[0016] like Figures 1-3As shown, this utility model provides a self-venting module for the suction section of a centrifugal pump. The module body 1 is a short-section shell structure, with a through suction channel 2 formed inside. An air collecting chamber 3 is integrally formed on the upper part of the body. An automatic venting valve 4 is installed on the top of the air collecting chamber 3 for large-volume venting during startup and small-volume continuous venting during stable operation. A manual venting / water injection interface 5 is provided on the air collecting chamber 3 for manual venting and liquid injection into the system. The air collecting chamber 3 is connected to the suction channel 2 through a connecting opening 6 located in the upper edge area of ​​the suction channel 2, allowing the gas at the top of the suction channel to smoothly enter the air collecting chamber 3. A first flange connection surface 7 and a second flange connection surface 8 are respectively provided at both ends of the module body 1. The first flange connection surface 7 is used to connect to the upstream inlet pipe, and the second flange connection surface 8 is used to connect to the downstream pump body suction port, thereby forming a clamp-on installation.

[0017] In one embodiment, the automatic vent valve 4 is a float-type or composite air valve. The manual vent / water inlet 5 can be threaded or a quick-connect coupling, and its orientation can be adjusted via a rotatable connector if necessary to facilitate connection to an external hose or drain pipe. The edges of the connecting opening 6 can be rounded or chamfered to reduce the formation of local eddies and cavitation nuclei.

[0018] During installation, the module body 1 can be rotated circumferentially relative to the axis of the intake channel 2, so that the automatic exhaust valve 4 is located at the highest point of the intake section it serves, which facilitates the natural rise and concentration of free air and timely discharge.

[0019] The method of using this utility model is as follows: 1. Installation: Connect the first flange connection surface 7 to the inlet pipeline flange, and connect the second flange connection surface 8 to the pump body suction port flange; select appropriate gaskets and fasteners according to the medium and pressure, and tighten them according to specifications. Rotate the module body 1 circumferentially to position the automatic exhaust valve 4 at the highest point of the suction section it serves; 2. Pre-start priming and venting: Connect an external water source through the manual venting / water filling port 5 to prime the system. Simultaneously, the automatic venting valve 4 will automatically vent when gas accumulates at the top. After priming, close port 5 and ensure the external plug / blind cap is in place. 3. Operation: After the pump starts, the automatic air vent valve 4 maintains a small amount of air venting to remove microbubbles that are released during operation; when the operating conditions fluctuate, the automatic air vent valve works with the anti-siphon component to suppress unfavorable flow.

[0020] Furthermore, a manual isolation valve can be installed on the air intake side of the automatic exhaust valve 4, and a venting port can be installed between the isolation valve and the automatic exhaust valve for releasing residual pressure at the clamp point and for safe disassembly and assembly during maintenance; the isolation valve remains open during operation.

[0021] Furthermore, when the manual venting / water filling port 5 is connected to the outside, a one-way valve and / or a throttling element can be connected in series downstream, and a blind cover is provided at the outer end to prevent backflow, siphoning, and external contamination.

[0022] Furthermore, depending on the medium and operating conditions, the material of the module body 1 can be selected as carbon steel, ductile iron or stainless steel (such as 304, 316L or duplex stainless steel), and a corrosion-resistant lining or anti-corrosion coating can be provided on the inner surface of the suction channel (2) to improve corrosion resistance and service life.

[0023] Furthermore, during installation, it is recommended to ensure that the automatic exhaust valve 4 has a certain relative height difference with the highest inner top of its service range intake side in order to enhance the air gathering and exhaust effect.

[0024] This invention relates to a compact, easy-to-install, and reliable self-venting module for the suction section of a centrifugal pump, suitable for pump stations or units handling clean water, circulating water, and similar media. Without departing from the concept of this invention, the automatic venting valve can employ different flow control mechanisms to adapt to various operating conditions; this is not limited herein.

[0025] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A centrifugal pump suction section self-venting module, comprising a module body (1) sandwiched between the pump body suction port and the inlet pipe, wherein a through suction channel (2) is formed within the module body (1), characterized in that: The upper part of the module body (1) is integrally formed into a gas collecting chamber (3); an automatic exhaust valve (4) is installed on the top of the gas collecting chamber (3); a manual venting / water injection interface (5) is provided on the gas collecting chamber (3); the gas collecting chamber (3) is connected to the upper part of the suction channel (2) through a connecting opening (6); a first flange connection surface (7) is provided at one end of the module body (1) for connecting to the inlet pipeline; a second flange connection surface (8) is provided at the other end of the module body (1) for connecting to the suction port of the pump body.

2. The self-exhausting module according to claim 1, characterized in that: The automatic exhaust valve (4) is a float-type or composite air valve.

3. The self-exhausting module according to claim 1 or 2, characterized in that: The manual venting / water filling port (5) adopts a threaded or quick-connect structure and can be connected to an external pipeline through a rotatable connector.

4. The self-exhausting module according to claim 1, characterized in that: The connecting opening (6) is located in the upper edge region of the suction channel (2), and its edge is rounded or chamfered.

5. The self-exhausting module according to claim 1, characterized in that: The module body (1) is circumferentially rotatable relative to the axis of the inhalation channel (2) so that the automatic exhaust valve (4) is at the highest point of the inhalation section it serves after installation.

6. The self-exhausting module according to claim 1, characterized in that: The module body (1) is a metal casting or welded part, and the material is carbon steel, ductile iron or stainless steel; and a corrosion-resistant lining or anti-corrosion coating can be provided on the inner surface of the suction channel according to the medium and working conditions.

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