Protection device for improving reliability of circulating water pump control system

Abstract

The utility model relates to a protection device for improving reliability of a circulating water pump control system. The protection device comprises a hydraulic oil pump, a hydraulic control butterfly valve, a circulating water pump, a hydraulic control butterfly valve control system, a DCS control cabinet and remote monitoring equipment. The hydraulic oil pump is electrically connected with the hydraulic control butterfly valve control system; the hydraulic control butterfly valve is connected with the circulating water pump; a travel switch and an encoder are arranged on the hydraulic control butterfly valve; the travel switch is electrically connected with a hydraulic control butterfly valve control system; the encoder is fixed on a valve of the hydraulic control butterfly valve through a positioning screw capable of synchronously rotating with the valve, and is electrically connected with a DCS (Distributed Control System) control cabinet; the hydraulic control butterfly valve is electrically connected with the DCS control cabinet; and the DCS control cabinet is electrically connected with the remote monitoring equipment. Compared with the prior art, the system has the advantages of improving system reliability, reducing failure rate and the like.

Description

Technical Field

[0001] This utility model relates to the field of circulating water pump control system technology, and in particular to a protection device for improving the reliability of circulating water pump control system. Background Technology

[0002] Currently used circulating water pump control systems employ electrical contact pressure gauges to control the pump's start and stop. This approach suffers from low accuracy and susceptibility of mechanical components to environmental factors, leading to lower reliability. Furthermore, the DCS display for hydraulically controlled butterfly valves only shows the valve's operating position and its fully open / closed status, failing to provide a clear view of the valve's movement and intermediate positions. It also lacks interlocking protection logic, making interlocking start and stop impossible. This can result in situations where the circulating pump starts but the hydraulically controlled butterfly valve remains closed, or vice versa. The former leads to pump stalling, damaging system equipment and impacting production efficiency, while the latter affects the unit's condenser vacuum, potentially triggering a protective shutdown. Utility Model Content

[0003] The purpose of this invention is to overcome the defects of the prior art and provide a protection device that improves the reliability of the circulating water pump control system.

[0004] The objective of this utility model can be achieved through the following technical solutions:

[0005] A protection device for improving the reliability of a circulating water pump control system includes a hydraulic oil pump, a hydraulically controlled butterfly valve, a circulating water pump, a hydraulically controlled butterfly valve control system, a DCS control cabinet, and a remote monitoring device. The hydraulic oil pump is electrically connected to the hydraulically controlled butterfly valve control system. The hydraulically controlled butterfly valve is connected to the circulating water pump. The hydraulically controlled butterfly valve is equipped with a limit switch and an encoder. The limit switch controls the valve position of the hydraulically controlled butterfly valve. The encoder implements the interlocking logic of the hydraulically controlled butterfly valve's open / close and the sequential start / stop interlocking logic of the circulating water pump. The limit switch is electrically connected to the hydraulically controlled butterfly valve control system. The encoder is fixed to the hydraulically controlled butterfly valve via a positioning screw that rotates synchronously with the valve and is electrically connected to the DCS control cabinet. The hydraulically controlled butterfly valve is electrically connected to the DCS control cabinet. The DCS control cabinet is electrically connected to the remote monitoring device.

[0006] Furthermore, the remote monitoring device is a computer.

[0007] Furthermore, the hydraulic pump is equipped with a high-limit pressure relay and a low-limit pressure relay; the high-limit pressure relay and the low-limit pressure relay are electrically connected to the hydraulic butterfly valve control system.

[0008] Furthermore, the high-limit pressure relay is a pressure relay with a threshold of 16 MPa; the low-limit pressure relay is a pressure relay with a threshold of 13 MPa.

[0009] Furthermore, the limit switch is a limit switch with a switching degree of 15 degrees.

[0010] Compared with the prior art, the present invention has the following advantages:

[0011] (1) This utility model adds butterfly valve opening and closing logic and circulating water pump start and stop interlocking logic to the encoder to realize pump and valve linkage control, effectively protect the equipment, reduce water hammer effect, improve system stability and automation level, and save about RMB 200,000 in equipment and labor costs per unit per year.

[0012] (2) This utility model replaces the electric contact pressure switch by setting high and low limit pressure relays, thereby replacing the manual adjustment of the mechanical contact position to control the automatic start and stop of the oil pump, which can effectively improve the accuracy and reliability of the hydraulic system. Attached Figure Description

[0013] Figure 1 This is a structural schematic diagram of the present invention;

[0014] Figure 2 This utility model provides a schematic diagram of the butterfly valve's interlocking opening and closing logic.

[0015] Figure 3 A schematic diagram of the interlocking logic for sequential start and stop of the circulating water pump provided by this utility model.

[0016] The labels in the diagram indicate:

[0017] 1. Hydraulic oil pump; 2. Hydraulic butterfly valve; 3. Circulating water pump; 4. Hydraulic butterfly valve control system; 5. DCS control cabinet; 6. Remote monitoring equipment; 7. Limit switch; 8. Encoder; 9. Positioning screw; 10. High limit pressure relay; 11. Low limit pressure relay. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0019] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0020] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0021] In the description of this utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element 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.

[0022] It should be noted that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0023] Furthermore, terms such as "horizontal" and "vertical" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0024] Example

[0025] like Figure 1As shown, a protection device for improving the reliability of a circulating water pump control system includes a hydraulic oil pump 1, a hydraulically controlled butterfly valve 2, a circulating water pump 3, a hydraulically controlled butterfly valve control system 4, a DCS control cabinet 5, and a remote monitoring device 6. The hydraulic oil pump 1 is electrically connected to the hydraulically controlled butterfly valve control system 4. The hydraulically controlled butterfly valve 2 is connected to the circulating water pump 3. The hydraulically controlled butterfly valve 2 is equipped with a limit switch 7 and an encoder 8. The limit switch 7 controls the valve position of the hydraulically controlled butterfly valve 2, with an opening degree of 15 degrees. The encoder 8 is an encoder that realizes the interlocking logic of the hydraulically controlled butterfly valve 2's open / close and the sequential start / stop interlocking logic of the circulating water pump 3. The limit switch 7 is electrically connected to the hydraulically controlled butterfly valve control system 4. The encoder 8 is fixed to the valve of the hydraulically controlled butterfly valve 2 by a positioning screw 9 that rotates synchronously with the valve, and is electrically connected to the DCS control cabinet 5. The hydraulically controlled butterfly valve 2 is electrically connected to the DCS control cabinet 5. The DCS control cabinet 5 is electrically connected to the remote monitoring device 6. The control device 6 is a computer, facilitating remote monitoring by operators to observe and confirm the operation of the hydraulic butterfly valve 2 and its position feedback throughout its operation. The hydraulic pump 1 is equipped with a high-limit pressure relay 10 and a low-limit pressure relay 11. These relays are electrically connected to the hydraulic butterfly valve control system 4. The high-limit pressure relay 10 has a threshold pressure of 16 MPa, and the low-limit pressure relay 11 has a threshold pressure of 13 MPa. When the oil pressure exceeds 16 MPa, the high-limit pressure relay 10 senses and controls the hydraulic pump 1 to shut down, while simultaneously sending a signal to the hydraulic butterfly valve control system 4. When the oil pressure is below 13 MPa, the low-limit pressure relay 11 senses and controls the hydraulic pump 1 to start, while also sending a signal to the hydraulic butterfly valve control system 4. This system can replace the electrical contact pressure switch, thereby replacing manual adjustment of the mechanical contact position to control the automatic start and stop of the hydraulic pump 1, effectively improving the accuracy and reliability of the hydraulic system.

[0026] like Figure 2 and 3 As shown, the interlocking logic for the opening and closing of the hydraulic butterfly valve 2 and the sequential start and stop interlocking logic for the circulating water pump 3 of this utility model are as follows:

[0027] 1) Hydraulic butterfly valve 2 opening logic: When the hydraulic butterfly valve control system 4 receives the opening signal, it sequentially controls the valve opening step 1, opens the limit switch 7, or after the circulating water pump 3 runs for a three-second delay, the encoder 8 sends a signal to the DCS control cabinet 5. The DCS control cabinet 5 sends a signal to the hydraulic butterfly valve control system 4 and a signal to the remote monitoring device 6 to display the screen. The hydraulic butterfly valve control system 4 sends the valve opening signal to the hydraulic butterfly valve 2, opens the hydraulic butterfly valve 2, and sends the open status signal back to the DCS control cabinet 5 and then to the remote monitoring device 6.

[0028] 2) Hydraulic butterfly valve 2 closing logic: When the hydraulic butterfly valve control system 4 receives the closing signal, the first step of the sequential valve closing is to close the limit switch 7, or after the circulating water pump 3 stops and delays for three seconds, the encoder 8 sends a signal to the DCS control cabinet 5. The DCS control cabinet 5 sends a signal to the hydraulic butterfly valve control system 4 and a signal to the remote monitoring device 6 for display. The hydraulic butterfly valve control system 4 sends an opening signal to the hydraulic butterfly valve 2, closing the hydraulic butterfly valve 2, and feeding back the closed status signal to the DCS control cabinet 5 and sending it to the remote monitoring device 6.

[0029] 3) Circulating water pump 3 sequential start logic: Click the circulating water pump 3 sequential start button to start. The first step is to sequentially control the opening of hydraulic butterfly valve 2. After the limit switch 7 of hydraulic butterfly valve 2 is opened to 15 degrees, the second step is to sequentially control the pump to start.

[0030] 4) Circulating water pump 3 sequential stop logic: Click the sequential stop button of circulating water pump 3 to start. The first step is to sequentially control the closing of hydraulic butterfly valve 2. After the limit switch 7 of hydraulic butterfly valve 2 is closed to 15 degrees, the second step is to sequentially control the pump to stop. This realizes the linkage control of pump and valve, effectively protects the equipment, reduces water hammer effect, and improves system stability and automation.

[0031] The preferred embodiments of this utility model have been described in detail above. It should be understood that those skilled in the art can make numerous modifications and variations based on the concept of this utility model without creative effort. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of this utility model through logical analysis, reasoning, or limited experimentation on the basis of existing technology should be within the scope of protection defined by the claims.

Claims

1. A protection device for improving the reliability of a circulating water pump control system, characterized in that, The system includes a hydraulic oil pump (1), a hydraulically controlled butterfly valve (2), a circulating water pump (3), a hydraulically controlled butterfly valve control system (4), a DCS control cabinet (5), and a remote monitoring device (6); the hydraulic oil pump (1) is electrically connected to the hydraulically controlled butterfly valve control system (4); the hydraulically controlled butterfly valve (2) is connected to the circulating water pump (3); the hydraulically controlled butterfly valve (2) is equipped with a limit switch (7) and an encoder (8); the limit switch (7) is a limit switch for controlling the valve position of the hydraulically controlled butterfly valve (2); the encoder (8 ... 8) An encoder for realizing the interlocking logic of the hydraulic butterfly valve (2) opening and closing and the sequential start and stop of the circulating water pump (3); the limit switch (7) is electrically connected to the hydraulic butterfly valve control system (4); the encoder (8) is fixed on the valve of the hydraulic butterfly valve (2) by a positioning screw (9) that can rotate synchronously with the valve, and is electrically connected to the DCS control cabinet (5); the hydraulic butterfly valve (2) is electrically connected to the DCS control cabinet (5); the DCS control cabinet (5) is electrically connected to the remote monitoring equipment (6).

2. The protection device for improving the reliability of a circulating water pump control system according to claim 1, characterized in that, The remote monitoring device (6) is a computer.

3. The protection device for improving the reliability of a circulating water pump control system according to claim 1, characterized in that, The hydraulic oil pump (1) is equipped with a high-limit pressure relay (10) and a low-limit pressure relay (11); the high-limit pressure relay (10) and the low-limit pressure relay (11) are electrically connected to the hydraulic butterfly valve control system (4).

4. The protection device for improving the reliability of a circulating water pump control system according to claim 3, characterized in that, The high-limit pressure relay (10) is a pressure relay with a threshold of 16 MPa; the low-limit pressure relay (11) is a pressure relay with a threshold of 13 MPa.

5. The protection device for improving the reliability of a circulating water pump control system according to claim 1, characterized in that, The limit switch (7) is a limit switch with a switching degree of 15 degrees.

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