Novel closed water pump control cabinet for coal-fired power plant

Abstract

The invention relates to the technical field of control cabinets, and discloses a novel closed water pump control cabinet for a coal-fired power plant. Comprising a cabinet body, a frequency converter additionally arranged in an inner cavity of the cabinet body, an A closed water pump frequency conversion input disconnecting link QS2, an A closed water pump frequency conversion output disconnecting link QS3, an A closed water pump power frequency output disconnecting link QS1, a B closed water pump frequency conversion input disconnecting link QS5, a B closed water pump frequency conversion output disconnecting link QS6, a B closed water pump power frequency output disconnecting link QS4, an A closed water pump wire inlet switch QF01 and a B closed water pump wire inlet switch QF02. Compared with the prior art, by optimizing the control cabinet loop and the operation and locking between the operation disconnecting links, the two closed water pumps can both have the variable-frequency adjustment and energy-saving capacity only through one frequency converter, the adjustment effect is improved, and the one-time investment of the control loop is greatly reduced; through switching operation of the disconnecting link, the equipment flexibility is high, the use of one frequency converter does not affect the standby of the other frequency converter, and the operation reliability is ensured.

Description

Technical Field

[0001] This invention relates to the field of control cabinet technology, specifically to a novel closed-loop water pump control cabinet for coal-fired power plants. Background Technology

[0002] In coal-fired power plants, the closed-loop cooling water system undertakes the tasks of cooling the sealing oil system, condensate pump bearing housing and other important oil systems and auxiliary equipment. As the core equipment of the system, the operation status of the closed-loop water pump is directly related to the stable operation of related equipment in the power plant.

[0003] In existing technologies, closed-loop water pumps have two common operating configurations. One configuration uses two power frequency motors, one in operation and one on standby. This configuration relies on power frequency operation for basic water supply, resulting in the pumps being unable to adjust motor power according to actual cooling water demand. This leads to unnecessary power consumption in scenarios with low cooling water demand, resulting in poor regulation and energy-saving performance. The other configuration equips both pumps with frequency converters. This structure achieves frequency conversion regulation through dual frequency converters, but the inherent characteristics of high-power frequency converters significantly increase the initial investment in equipment. Furthermore, this fixed dual-frequency converter configuration lacks a flexible switching mechanism, making it difficult to ensure effective backup for the other pump when one is running, thus affecting the reliability of the closed-loop water pump system. Therefore, a novel closed-loop water pump control cabinet for coal-fired power plants is proposed. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a novel closed-loop water pump control cabinet for coal-fired power plants, thereby solving the aforementioned technical problem that prevents water pumps from adjusting motor power according to actual cooling water demand.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a novel closed-loop water pump control cabinet for coal-fired power plants, comprising:

[0006] The cabinet includes a cabinet door that rotates to connect to the front of the cabinet. The cabinet's interior is equipped with a frequency converter, a closed-loop water pump frequency converter input switch QS2, a closed-loop water pump frequency converter output switch QS3, a closed-loop water pump power frequency output switch QS1, a closed-loop water pump frequency converter input switch QS5, a closed-loop water pump frequency converter output switch QS6, a closed-loop water pump power frequency output switch QS4, a closed-loop water pump inlet switch QF01, and a closed-loop water pump inlet switch QF01. The circuit breaker QF02 is installed, and a closed-loop water pump is installed outside the cabinet. The frequency converter is connected to the closed-loop water pump via a signal connection. Mechanical interlocking structures are installed at the corresponding positions of the A closed-loop water pump frequency converter input switch QS2, A closed-loop water pump frequency converter output switch QS3, A closed-loop water pump power frequency output switch QS1, B closed-loop water pump frequency converter input switch QS5, B closed-loop water pump frequency converter output switch QS6 and B closed-loop water pump power frequency output switch QS4.

[0007] The mounting plate is located on the back of the inner cavity of the cabinet, and electrical components are evenly distributed on the front of the mounting plate.

[0008] A. Closed-loop water pump variable frequency operation mode

[0009] When the A-type closed-loop water pump frequency converter input switch QS2 and the A-type closed-loop water pump frequency converter output switch QS3 are closed, the mechanical interlocking structure prevents the B-type closed-loop water pump frequency converter input switch QS5 and the B-type closed-loop water pump frequency converter output switch QS6 from closing simultaneously.

[0010] Close the power frequency output switch QS4 of closed-type water pump B, close the incoming switch QF01 of closed-type water pump A, and the frequency converter drives closed-type water pump A to operate in frequency conversion mode through signal connection, while closed-type water pump B is in power frequency standby mode.

[0011] B. Closed-loop water pump variable frequency operation mode

[0012] When the B-type closed-loop water pump frequency converter input switch QS5 and the B-type closed-loop water pump frequency converter output switch QS6 are closed, the mechanical interlocking structure prevents the A-type closed-loop water pump frequency converter input switch QS2 and the A-type closed-loop water pump frequency converter output switch QS3 from closing simultaneously.

[0013] Close the power frequency output switch QS1 of closed-loop water pump A, close the incoming switch QF02 of closed-loop water pump B, and the frequency converter drives closed-loop water pump B to operate in variable frequency mode through signal connection. Closed-loop water pump A is in power frequency standby mode.

[0014] Preferably, an observation window is installed on the upper front of the cabinet door, and a silicone rubber elastic sealing gasket is added between the cabinet body and the cabinet door. The observation window allows for a direct view of the internal condition of the cabinet without opening the cabinet door; the silicone rubber elastic sealing gasket enhances the sealing between the cabinet body and the cabinet door, preventing external impurities from entering the internal cavity of the cabinet.

[0015] Preferably, the lower part of the cabinet is equipped with spring-loaded shock-absorbing support feet on all four sides, and each spring-loaded shock-absorbing support foot consists of an upper connecting seat, a lower support seat, a compression spring, and a rubber sleeve. The compression spring's expansion and contraction dampens the cabinet's vibration, and the rubber sleeve protects the compression spring, reducing the impact of external factors on the compression spring, improving the cabinet's shock absorption and buffering capacity, and ensuring the stability of the internal structure.

[0016] Preferably, the upper connecting seat of the spring-loaded shock-absorbing support foot is connected to the bottom of the cabinet by bolts, and an anti-slip rubber pad is added to the surface of the lower support seat, with a rubber outer sleeve covering the compression spring. The bolt connection enhances the connection between the upper connecting seat and the bottom of the cabinet, preventing the spring-loaded shock-absorbing support foot from falling off; the anti-slip rubber pad increases the friction between the lower support seat and the placement surface, preventing the cabinet from shifting; the rubber outer sleeve prevents impurities from entering the gap of the compression spring, ensuring the expansion and contraction performance of the compression spring and maintaining the shock-absorbing effect of the spring-loaded shock-absorbing support foot.

[0017] Preferably, guide rails are installed on both sides of the inner cavity of the cabinet, and guide grooves are formed on the inner side of the guide rails, with guide blocks slidably connected to the inner cavity of the guide grooves. The guide grooves provide stable sliding guidance for the guide blocks, ensuring smooth movement of the guide blocks and providing basic support for adjusting the position of the mounting plate.

[0018] Preferably, the inner cross-section of the guide groove and the entire guide block are both T-shaped, and the surface of the guide block is connected to the center of both sides of the mounting plate. The T-shaped guide groove and the guide block cooperate with each other to prevent the guide block from detaching from the guide groove and enhance stability during sliding; the connection between the mounting plate and the guide block ensures that the mounting plate moves synchronously and smoothly with the guide block.

[0019] Preferably, the upper part of the guide groove has a vertical through groove, and a connecting stud is slidably connected to the inner cavity of the vertical through groove. The vertical through groove provides precise vertical movement guidance for the connecting stud, ensuring the accuracy of the moving direction of the connecting stud and facilitating subsequent alignment and connection with the guide block.

[0020] Preferably, the upper center of the guide block has a connecting screw groove, and the lower part of the connecting stud is threadedly connected to the connecting screw groove through a vertical through groove. The threaded connection method ensures a firm connection between the connecting stud and the guide block, preventing loosening and effectively positioning and fixing the guide block within the guide groove, thus ensuring the positional stability of the mounting plate.

[0021] Preferably, a fixing plate is installed on the upper part of the connecting stud, and an external rotating handle is added to the top of the connecting stud. The external rotating handle provides the operator with a convenient force application component, making it easy to rotate the connecting stud; the fixing plate increases the contact area between the connecting stud and the guide rail, improving the stability of subsequent fixing.

[0022] Preferably, the upper part of the guide rail is equipped with anti-slip protrusions, which are located on both sides of the top of the vertical groove. Anti-slip grooves are evenly formed on the lower part of the fixing pad, and the anti-slip grooves are in close contact with the corresponding anti-slip protrusions. The close contact between the anti-slip grooves and the anti-slip protrusions increases the friction between the fixing pad and the guide rail, effectively preventing the connecting studs from accidentally rotating and loosening, further strengthening the fixing effect of the guide block and the mounting plate, and improving the stability of the overall structure.

[0023] Compared with the prior art, the present invention provides a novel closed-loop water pump control cabinet for coal-fired power plants, which has the following advantages:

[0024] This new type of closed-loop water pump control cabinet for coal-fired power plants optimizes the circuit of the closed-loop water pump control cabinet, and enables the operation and interlocking of the knife switches between each operating knife switch. With only one frequency converter, it can enable two closed-loop water pumps to have frequency conversion regulation and energy-saving capabilities, improve the regulation effect, and at the same time significantly reduce the initial investment in the control circuit.

[0025] The equipment is highly flexible due to the switching operations of each disconnector. The use of one frequency converter does not affect the backup of another frequency converter, thus ensuring the reliability of the closed-loop water pump system. Attached Figure Description

[0026] Figure 1 This is a circuit diagram of the present invention;

[0027] Figure 2 This is a schematic diagram of the overall structure of the present invention;

[0028] Figure 3 This is a schematic diagram of the cabinet door and cabinet body separation structure of the present invention;

[0029] Figure 4 This is a schematic diagram of the mounting plate and its connection structure of the present invention;

[0030] Figure 5 This is a schematic diagram of the guide rail and its connection structure of the present invention;

[0031] Figure 6 This is a cross-sectional view of the guide rail and a schematic diagram of its connection structure according to the present invention.

[0032] In the diagram: 1. Cabinet body; 2. Cabinet door; 3. Spring shock-absorbing support foot; 4. Observation window; 5. Mounting plate; 6. Guide rail; 7. Guide groove; 8. Guide block; 9. Connecting screw groove; 10. Vertical through groove; 11. Connecting stud; 12. Fixing pad; 13. External rotating handle; 14. Anti-slip convex plate. Detailed Implementation

[0033] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] This invention provides a technical solution: a novel closed-loop water pump control cabinet for coal-fired power plants, comprising: (See attached diagram) Figures 1-6The cabinet consists of a cabinet body 1 and a cabinet door 2 rotatably connected to the front of the cabinet body 1. The inner cavity of the cabinet body 1 is equipped with a frequency converter, a closed-loop water pump frequency converter input switch QS2, a closed-loop water pump frequency converter output switch QS3, a closed-loop water pump power frequency output switch QS1, a closed-loop water pump frequency converter input switch QS5, a closed-loop water pump frequency converter output switch QS6, a closed-loop water pump power frequency output switch QS4, a closed-loop water pump inlet switch QF01, and a closed-loop water pump... The water pump inlet switch is QF02, and a closed-loop water pump is installed outside the cabinet 1. The frequency converter is connected to the closed-loop water pump via a signal connection. Mechanical interlocking structures are installed at the corresponding positions of the A closed-loop water pump frequency converter input switch QS2, A closed-loop water pump frequency converter output switch QS3, A closed-loop water pump power frequency output switch QS1, B closed-loop water pump frequency converter input switch QS5, B closed-loop water pump frequency converter output switch QS6 and B closed-loop water pump power frequency output switch QS4.

[0035] Mounting plate 5 is located on the back of the inner cavity of cabinet 1, and electrical components are evenly added to the front of mounting plate 5.

[0036] With just one frequency converter and a knife switch and mechanical interlocking structure, the variable frequency operation function of two closed water pumps can be realized, which greatly reduces the equipment investment cost.

[0037] The mechanical interlocking structure directly limits the misoperation of the disconnect switch, avoids circuit conflicts in different operating modes, and ensures the safety of personnel operation and the stable operation of equipment.

[0038] When one water pump is running at a variable frequency, the other water pump always remains in a standby state at the power frequency, ensuring that the standby water pump can be put into use in a timely manner if the frequency converter or the running water pump fails, thereby improving the reliability of the system operation.

[0039] The frequency converter drives the water pump to operate at a variable frequency through signal connection. It can adjust the water pump's operating status according to actual cooling needs, achieve energy-saving effect, and improve the power waste problem of traditional power frequency operation.

[0040] Please see Figure 2 and Figure 3 An observation window 4 is installed on the upper front of cabinet door 2, and a silicone rubber elastic sealing gasket is added between the cabinet body 1 and cabinet door 2. When cabinet door 2 is closed, the joint between cabinet body 1 and cabinet door 2 is sealed by the silicone rubber elastic sealing gasket; the internal cavity of cabinet body 1 can be observed through observation window 4.

[0041] The lower part of the cabinet 1 is equipped with spring-loaded shock-absorbing support feet 3 on all four sides. Each spring-loaded shock-absorbing support foot 3 consists of an upper connecting seat, a lower support seat, a compression spring, and a rubber sleeve. When the cabinet 1 vibrates, the vibration is transmitted to the upper connecting seat of the spring-loaded shock-absorbing support foot 3. The upper connecting seat drives the compression spring to expand and contract, while the lower support seat remains in contact with the placement surface. The rubber sleeve covers the compression spring.

[0042] The upper connecting seat of the spring-loaded shock-absorbing support foot 3 is connected to the bottom of the cabinet 1 by bolts, and an anti-slip rubber pad is added to the surface of the lower support seat, and a rubber sleeve is fitted over the compression spring. The upper connecting seat of the spring-loaded shock-absorbing support foot 3 is fixedly connected to the bottom of the cabinet 1 by bolts; the anti-slip rubber pad of the lower support seat is in contact with the placement surface; and the rubber sleeve is fitted over the compression spring.

[0043] Please see Figure 4 , Figure 5 and Figure 6 The cabinet body 1 has guide rails 6 installed on both sides of its inner cavity, and guide grooves 7 are formed on the inner side of the guide rails 6. Guide blocks 8 are slidably connected to the inner cavity of the guide grooves 7. The guide blocks 8 slide along the guide grooves 7 on the inner side of the guide rails 6.

[0044] The inner cross-section of the guide groove 7 and the entire guide block 8 are both T-shaped, and the surface of the guide block 8 is connected to the center of both sides of the mounting plate 5. The mounting plate 5 drives the guide block 8 to slide along the T-shaped guide groove 7.

[0045] A vertical through groove 10 is vertically formed in the upper part of the guide groove 7, and a connecting stud 11 is slidably connected to the inner cavity of the vertical through groove 10. The connecting stud 11 slides vertically along the vertical through groove 10 in the upper part of the guide groove 7.

[0046] The upper center of the guide block 8 has a connecting screw groove 9, and the lower part of the connecting stud 11 is threadedly connected to the connecting screw groove 9 through the vertical through groove 10. After the connecting stud 11 moves downward along the vertical through groove 10, by rotating the connecting stud 11, the lower part of the connecting stud 11 is driven into the inner cavity of the connecting screw groove 9 of the guide block 8, thus realizing the threaded connection.

[0047] A fixing plate 12 is installed on the upper part of the connecting stud 11, and an outer rotating handle 13 is added to the top of the connecting stud 11. The outer rotating handle 13 drives the connecting stud 11 to rotate, and the connecting stud 11 drives the fixing plate 12 to move vertically.

[0048] Anti-slip protrusions 14 are installed on the upper part of the guide rail 6, and the anti-slip protrusions 14 are located on both sides of the top of the vertical through groove 10. Anti-slip grooves are evenly formed on the lower part of the fixing pad 12, and the anti-slip grooves are tightly fitted with the corresponding anti-slip protrusions 14. The fixing pad 12 moves downward with the connecting stud 11, so that the anti-slip grooves on the lower part of the fixing pad 12 are tightly fitted with the anti-slip protrusions 14 on the upper part of the guide rail 6.

[0049] This solution involves closing the A-type closed-circuit pump frequency converter input switch QS2 and output switch QS3, and using a mechanical interlocking structure to prevent the B-type closed-circuit pump frequency converter input switch QS5 and output switch QS6 from closing simultaneously; closing the B-type closed-circuit pump power frequency output switch QS4, and closing the A-type closed-circuit pump inlet switch QF01, allowing the frequency converter to drive the A-type closed-circuit pump in frequency conversion operation via signal connection;

[0050] When the input switch QS5 and output switch QS6 of the B closed-loop water pump are closed, the mechanical interlocking structure prevents the input switch QS2 and output switch QS3 of the A closed-loop water pump from closing simultaneously. When the power frequency output switch QS1 of the A closed-loop water pump is closed, the inlet switch QF02 of the B closed-loop water pump is closed, and the frequency converter drives the B closed-loop water pump to operate in frequency conversion mode through the signal connection.

[0051] Mounting plate 5 drives guide block 8 to slide along guide groove 7 on the inner side of guide rail 6, and guide block 8 stops after moving to the corresponding position; connecting stud 11 slides vertically downward along vertical through groove 10 on the upper part of guide groove 7 and fits with guide block 8; outer rotating handle 13 drives connecting stud 11 to rotate, and connecting stud 11 drives the lower part to rotate into the inner cavity of connecting screw groove 9 of guide block 8; connecting stud 11 drives fixing pad 12 to move vertically downward, and fixing pad 12 drives the lower anti-slip groove to fit tightly with anti-slip protrusion 14 on the upper part of guide rail 6;

[0052] When cabinet door 2 is closed, the joint between cabinet body 1 and cabinet door 2 is sealed by a silicone rubber elastic sealing gasket; the internal cavity of cabinet body 1 can be observed through observation window 4.

[0053] When cabinet 1 vibrates, the vibration is transmitted to the upper connecting seat of spring damping support foot 3. The upper connecting seat drives the compression spring to expand and contract, while the lower support seat remains in contact with the placement surface, and the rubber sleeve wraps around the compression spring.

[0054] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0055] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A novel closed-loop water pump control cabinet for a coal-fired power plant, characterized in that, include: The cabinet (1) and the cabinet door (2) are rotatably connected to the front of the cabinet (1). The inner cavity of the cabinet (1) is equipped with a frequency converter, a closed-type water pump frequency converter input switch QS2, a closed-type water pump frequency converter output switch QS3, a closed-type water pump power frequency output switch QS1, a closed-type water pump frequency converter input switch QS5, a closed-type water pump frequency converter output switch QS6, a closed-type water pump power frequency output switch QS4, a closed-type water pump inlet switch QF01, and a closed-type water pump inlet switch QF01. The water pump inlet switch QF02 is provided, and a closed water pump is provided outside the cabinet (1). The frequency converter and the closed water pump are connected by a signal. The frequency converter input switch QS2, frequency converter output switch QS3, power frequency output switch QS1, frequency converter input switch QS5, frequency converter output switch QS6 and power frequency output switch QS4 of the closed water pump are all equipped with mechanical locking structures. The mounting plate (5) is located on the back of the inner cavity of the cabinet (1), and electrical components are evenly provided on the front of the mounting plate (5).

2. The novel closed-loop water pump control cabinet for a coal-fired power plant according to claim 1, characterized in that: An observation window (4) is installed on the upper front of the cabinet door (2), and a silicone rubber elastic sealing gasket is added between the cabinet body (1) and the cabinet door (2).

3. The novel closed-loop water pump control cabinet for a coal-fired power plant according to claim 1, characterized in that: The lower part of the cabinet (1) is equipped with spring shock-absorbing support feet (3) on all four sides, and the spring shock-absorbing support feet (3) are composed of an upper connecting seat, a lower support seat, a compression spring and a rubber sleeve.

4. The novel closed-loop water pump control cabinet for a coal-fired power plant according to claim 3, characterized in that: The upper connecting seat of the spring shock-absorbing support foot (3) is connected to the bottom of the cabinet (1) by bolts, and an anti-slip rubber pad is added to the surface of the lower support seat, and a rubber sleeve is provided on the outside of the compression spring.

5. A novel closed-loop water pump control cabinet for a coal-fired power plant according to claim 1, characterized in that: The cabinet (1) has guide rails (6) installed on both sides of its inner cavity, and guide grooves (7) are provided on the inner side of the guide rails (6), and guide blocks (8) are slidably connected to the inner cavity of the guide grooves (7).

6. A novel closed-loop water pump control cabinet for a coal-fired power plant according to claim 5, characterized in that: The inner cross-section of the guide groove (7) and the entire guide block (8) are T-shaped, and the surface of the guide block (8) is connected to the center of both sides of the mounting plate (5).

7. A novel closed-loop water pump control cabinet for a coal-fired power plant according to claim 5, characterized in that: The upper part of the guide groove (7) is provided with a vertical through groove (10), and a connecting stud (11) is slidably connected to the inner cavity of the vertical through groove (10).

8. A novel closed-loop water pump control cabinet for a coal-fired power plant according to claim 7, characterized in that: The upper center of the guide block (8) is provided with a connecting screw groove (9), and the lower part of the connecting stud (11) is threadedly connected to the connecting screw groove (9) through a vertical through groove (10).

9. A novel closed-loop water pump control cabinet for a coal-fired power plant according to claim 8, characterized in that: A fixing plate (12) is installed on the upper part of the connecting stud (11), and an external rotating handle (13) is added to the top of the connecting stud (11).

10. A novel closed-loop water pump control cabinet for a coal-fired power plant according to claim 9, characterized in that: The upper part of the guide rail (6) is equipped with an anti-slip convex plate (14), and the anti-slip convex plate (14) is located on both sides of the top of the vertical through groove (10), and an anti-slip groove is evenly provided on the lower part of the fixing pad (12), and the anti-slip groove is tightly fitted with the corresponding anti-slip convex plate (14).

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