Control device based on PLC transformer cooling system

Abstract

The invention provides a control device based on a PLC transformer cooling system, and relates to the technical field of control devices. The fixed seat is fixed on a transformer mounting seat, a cooling box with a rectangular box-shaped structure is fixed on the top end surface of the fixed seat, the cooling box is filled with cooling liquid, and a cover plate is fixed on the top of the cooling box; a first liquid pump is fixed to the top end face of the fixing base, a first liquid inlet pipe and a first liquid outlet pipe are connected to the first liquid pump, and the first liquid inlet pipe and the first liquid outlet pipe are both connected with a transformer cooling oil pipe. A liquid storage box, a liquid supply pipe, a guide rod and a floating block in the supplementing assembly form an automatic liquid supplementing system, and when liquid in the cooling box is reduced due to evaporation or consumption, the liquid in the liquid storage box automatically flows in for supplementing; when the liquid reaches a proper liquid level, the floating block ascends under buoyancy, the liquid supply pipe is sealed, supplement is automatically stopped, it is ensured that the cooling system is always in the optimal working state, and the risk of cooling failure caused by insufficient liquid is effectively avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of control devices, and particularly to a control device for a PLC transformer cooling system. Background Art

[0002] During the process of electric energy conversion in a transformer, losses will inevitably occur, which will in turn cause the temperature to rise. This temperature rise will not only affect the load-carrying capacity of the transformer, but also accelerate the aging of its internal insulating materials, shorten the service life, and ultimately have an adverse impact on the economy and stability of the power system. Therefore, it is necessary to cool it down, and at this time, a cooling system control device is required.

[0003] The control and protection circuits of existing large power transformer air-cooled heat dissipation devices mainly rely on switching elements such as relays and contactors. This results in the cooling and heat dissipation control system being prone to defects, increasing the operation and maintenance costs, and also affecting the stable operation of the power system; during cooling, multiple cooling structures cannot achieve cooling synchronously. Summary of the Invention

[0004] The present invention relates to a control device for a PLC transformer cooling system, which solves the problems that the control and protection circuits of existing large power transformer air-cooled heat dissipation devices mainly rely on switching elements such as relays and contactors, resulting in the cooling and heat dissipation control system being prone to defects, increasing the operation and maintenance costs, and also affecting the stable operation of the power system; during cooling, multiple cooling structures cannot achieve cooling synchronously.

[0005] The present invention provides a control device for a PLC transformer cooling system, which specifically includes: a fixed seat; the fixed seat is fixed on the transformer mounting seat, and a cooling box in the shape of a rectangular box is fixed on the top surface of the fixed seat. The cooling box is filled with a cooling liquid, and a cover plate is fixed on the top of the cooling box; a first liquid pump is fixed on the top surface of the fixed seat, and a first liquid inlet pipe and a first liquid discharge pipe are connected to the first liquid pump. Both the first liquid inlet pipe and the first liquid discharge pipe are connected to the transformer cooling oil pipe. The first liquid inlet pipe passes through the cooling box, and the part of the first liquid inlet pipe inside the cooling box is a continuously bent structure.

[0006] Further, a second liquid inlet pipe is fixed on the top surface of the cover plate, and a second liquid discharge pipe is fixed at the front end of the cooling box. The second liquid inlet pipe is connected to an external cooling liquid supply pipeline, and the second liquid discharge pipe is connected to an external liquid collection box.

[0007] Further, the cooling box, the cover plate, the first liquid pump, the first liquid inlet pipe, the first liquid discharge pipe, the second liquid inlet pipe, and the second liquid discharge pipe together form a cooling assembly; a cooling pipe is fixed inside the cooling box, and the cooling pipe is connected to an external cooling gas supply pipeline.

[0008] Furthermore, the cooling pipe is located below the first liquid inlet pipe, and the cooling pipe is of a wavy structure.

[0009] Furthermore, an auxiliary component is installed on the cooling box. The auxiliary component is composed of a sliding frame, a mixing plate, a motor, a threaded rod, a spray pipe, a second liquid pump, and spray holes. A sliding frame slides on the cooling box. One end of the front side of the sliding frame is fixed with a mixing plate, and the mixing plate is located inside the cooling box. A motor is fixed on the rear end face of the cooling box, and a threaded rod is fixed on the output shaft of the motor. The threaded rod is threadedly connected to the sliding frame.

[0010] Furthermore, a spray pipe is fixed to the bottom end face of the mixing plate, and a second liquid pump is fixed to the top end face of the fixing seat. The liquid inlet pipe of the second liquid pump is located inside the cooling box, and the liquid discharge pipe of the second liquid pump is connected to the spray pipe.

[0011] Furthermore, the spray pipe is of a cylindrical tubular structure, and spray holes are arranged in a fan-shaped array at the lower position of the outer wall of the spray pipe.

[0012] Furthermore, a replenishing component is fixed to the top end face of the fixing seat. The replenishing component is composed of a liquid storage tank, a liquid supply pipe, a guiding rod, and a floating block. A liquid storage tank is fixed to the top end face of the fixing seat. A liquid supply pipe is connected to the liquid storage tank, and the other end of the liquid supply pipe is connected to the cooling box; a guiding rod slides on the cover plate, and one end of the lower part of the guiding rod is fixed to the floating block. The left end face of the floating block contacts the left end face of the inner wall of the liquid storage tank, and the liquid supply pipe can be sealed when the floating block slides upward.

[0013] Furthermore, a control box is fixed to the top end face of the fixing seat. A microprocessor is installed in the control box, and a temperature sensor is installed on the front end face of the mixing plate. The temperature sensor is electrically connected to the microprocessor.

[0014] The present invention provides a control device for a PLC transformer cooling system, which has the following beneficial effects: In terms of building the basic cooling efficiency, the oil in the transformer cooling oil pipe is driven to circulate by the first liquid pump. The first liquid inlet pipe extends deep into the cooling box and adopts a continuous bending structure, which greatly increases the contact area and time between the oil and the cooling liquid in the box, enabling the oil to fully release heat when flowing through the cooling box; at the same time, the cooling liquid circulation channel composed of the second liquid inlet pipe and the second liquid discharge pipe realizes the real-time update of the cooling liquid in the box, ensuring the high efficiency of the cooling medium and enabling the oil to obtain a double cooling effect; in addition, the wavy cooling pipe located below the first liquid inlet pipe introduces cooling gas, and its unique shape design allows the cold air flow to diffuse more evenly, further reducing the oil temperature from the bottom. The combined action of multiple cooling methods significantly improves the overall cooling efficiency.

[0015] In terms of optimizing the cooling effect, the design of the auxiliary components is delicate and practical; the motor drives the threaded rod to rotate, driving the sliding frame and the mixing plate to reciprocate back and forth in the cooling box. At the same time, the second liquid pump pumps out the liquid in the box and sprays it out through the fan-shaped array of spray holes at the bottom of the spray pipe; this way of combining mechanical stirring and liquid spraying realizes the all-round and high-intensity mixing of the liquid in the cooling box, making the liquid temperature distribution more uniform, and the heat exchange with the oil in the first liquid inlet pipe more sufficient, further strengthening the cooling effect.

[0016] The intelligent control and stable operation guarantee mechanism of the device is also excellent; the microprocessor in the control box and the temperature sensor at the front end of the mixing plate form an intelligent feedback system. The temperature sensor monitors the temperature in the cooling box in real time and transmits the data to the microprocessor; when the temperature is higher than the preset threshold, the microprocessor automatically increases the power of the first liquid pump to accelerate the oil circulation speed and enhance the cooling capacity; when the temperature is lower than the threshold, the power is reduced to avoid energy waste, realizing the dynamic and precise adjustment of the cooling intensity; and the liquid storage tank, liquid supply pipe, guide rod and floating block in the replenishment component form an automatic liquid replenishment system. When the liquid in the cooling box decreases due to evaporation or consumption, the liquid in the liquid storage tank automatically flows in for replenishment; when the liquid reaches the appropriate liquid level, the floating block rises under the buoyancy force and seals the liquid supply pipe, automatically stopping the replenishment, ensuring that the cooling system is always in the best working state and effectively avoiding the risk of cooling failure caused by insufficient liquid. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings of the embodiments will be briefly introduced below.

[0018] The drawings in the following description only relate to some embodiments of the present invention and do not limit the present invention.

[0019] In the drawings: Figure 1 The axonometric structural schematic diagram of the control device of the PLC transformer cooling system based on the present invention is shown; Figure 2 The present invention is shown Figure 1 The axonometric structural schematic diagram after rotation; Figure 3 The axonometric structural schematic diagram of the control device of the PLC transformer cooling system based on the present invention after partial dissection is shown; Figure 4 The present invention is shown Figure 3 The enlarged structural schematic diagram at A of; Figure 5 The front view structural schematic diagram of the control device of the PLC transformer cooling system based on the present invention after partial dissection is shown; Figure 6 The axonometric structural schematic diagram of the auxiliary components of the present invention is shown; Figure 7 shows the present invention Figure 6 a schematic enlarged structure diagram at position B of the present invention; Figure 8 shows the schematic structural diagram of the system composition of the present invention.

[0020] List of Reference Numerals 1. Fixed seat; 2. Cooling component; 201. Cooling box; 202. Cover plate; 203. First liquid pump; 204. First liquid inlet pipe; 205. First liquid discharge pipe; 206. Second liquid inlet pipe; 207. Second liquid discharge pipe; 3. Cooling pipe; 4. Auxiliary component; 401. Sliding frame; 402. Mixing plate; 403. Motor; 404. Threaded rod; 405. Spray pipe; 406. Second liquid pump; 407. Spray holes; 5. Supplementary component; 501. Liquid storage tank; 502. Liquid supply pipe; 503. Guide rod; 504. Floating block; 6. Control box; 601. Microprocessor; 602. Temperature sensor. Detailed Embodiments

[0021] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention.

[0022] Unless otherwise defined, all terms (including technical and scientific terms) used in the embodiments of the present invention have the same meaning as commonly understood by those of ordinary skill in the art to which the present invention belongs. It should also be understood that terms such as those defined in a general dictionary should be interpreted as having a meaning consistent with their meaning in the context of the relevant art, and should not be interpreted in an idealized or overly formal sense unless explicitly defined in the embodiments of the present invention.

[0023] In the embodiments of the present invention, the terms "first", "second" and similar terms do not denote any order, quantity or importance, but are only used to distinguish different components. Similar terms such as "a", "an" or "the" do not denote a quantity limitation either, but indicate that there is at least one. Similarly, terms such as "comprising" or "including" mean that the elements or objects appearing before this word cover the elements or objects listed after this word and their equivalents, without excluding other elements or objects. In the following description, spatial and orientation terms such as "upper", "lower", "front", "rear", "top", "bottom", "vertical" and "horizontal" may be used to describe the embodiments of the present invention, but it should be understood that these terms are only for the convenience of describing the embodiments shown in the drawings, and do not require the actual device to be constructed or operated in a specific orientation. In the following description, the use of terms such as "connected", "coupled", "fixed" and "attached" may mean that two elements or structures are directly connected without other elements or structures therebetween, or may mean that two elements or structures are indirectly connected through intermediate elements or structures, unless otherwise expressly stated herein.

[0024] Embodiment 1: Please refer to Figures 1 to 8 : The present invention provides a control device for a PLC transformer cooling system, comprising: a fixed seat 1; the fixed seat 1 is fixed on the transformer mounting seat, and a cooling box 201 in the shape of a rectangular box is fixed on the top surface of the fixed seat 1. The cooling box 201 is filled with a cooling liquid, and a cover plate 202 is fixed on the top of the cooling box 201; a first liquid pump 203 is fixed on the top surface of the fixed seat 1. A first liquid inlet pipe 204 and a first liquid discharge pipe 205 are connected to the first liquid pump 203. Both the first liquid inlet pipe 204 and the first liquid discharge pipe 205 are connected to the transformer cooling oil pipe. The first liquid inlet pipe 204 passes through the cooling box 201, and the part of the first liquid inlet pipe 204 inside the cooling box 201 is in a continuously bent structure. During use, when the first liquid pump 203 is started, the oil in the transformer cooling oil pipe starts to circulate under the drive of the first liquid pump 203. Through circulation, the temperature of the transformer can be reduced. When the oil flows through the area of the cooling box 201, the liquid in the cooling box 201 can cool the first liquid inlet pipe 204 and the oil inside the first liquid inlet pipe 204, ensuring the effect of cooling the transformer.

[0025] Among them, a second liquid inlet pipe 206 is fixed to the top surface of the cover plate 202, and a second liquid discharge pipe 207 is fixed to the front end of the cooling box 201. The second liquid inlet pipe 206 is connected to an external cooling liquid supply pipeline, and the second liquid discharge pipe 207 is connected to an external liquid collection box. During use, the cooling liquid enters the inside of the cooling box 201 through the second liquid inlet pipe 206 and contacts the first liquid inlet pipe 204 to cool the oil liquid. Then, the liquid is discharged through the second liquid discharge pipe 207, realizing the secondary cooling of the oil liquid in the first liquid inlet pipe 204.

[0026] Among them, the cooling box 201, the cover plate 202, the first liquid pump 203, the first liquid inlet pipe 204, the first liquid discharge pipe 205, the second liquid inlet pipe 206, and the second liquid discharge pipe 207 together form a cooling assembly 2; a cooling pipe 3 is fixed inside the cooling box 201, and the cooling pipe 3 is connected to an external cooling gas supply pipeline.

[0027] Among them, the cooling pipe 3 is located below the first liquid inlet pipe 204, and the cooling pipe 3 has a wavy structure. During use, the cooling gas enters the inside of the cooling pipe 3, and at this time, the cold air diffuses around to cool the first liquid inlet pipe 204 and the oil liquid inside, ensuring the subsequent cooling effect of the oil liquid on the transformer.

[0028] Among them, an auxiliary assembly 4 is installed on the cooling box 201. The auxiliary assembly 4 is composed of a sliding frame 401, a mixing plate 402, a motor 403, a threaded rod 404, a spray pipe 405, a second liquid pump 406, and spray holes 407. A sliding frame 401 slides on the cooling box 201. One end of the front side of the sliding frame 401 is fixed with a mixing plate 402. The mixing plate 402 is located inside the cooling box 201. A motor 403 is fixed to the rear end surface of the cooling box 201. A threaded rod 404 is fixed to the output shaft of the motor 403. The threaded rod 404 is threadedly connected to the sliding frame 401. When mixing the liquid in the cooling box 201, just drive the motor 403 to rotate reciprocally. The motor 403 drives the threaded rod 404 to rotate. Under the reciprocating drive of the threaded rod 404, the sliding frame 401 and the mixing plate 402 can move back and forth, thus realizing the mixing of the liquid in the cooling box 201. By mixing the liquid in the cooling box 201, the cooling of the oil liquid in the first liquid inlet pipe 204 can be better achieved.

[0029] Among them, a spray pipe 405 is fixed to the bottom end surface of the mixing plate 402, and a second liquid pump 406 is fixed to the top end surface of the fixing seat 1. The liquid inlet pipe of the second liquid pump 406 is located inside the cooling box 201, and the liquid discharge pipe of the second liquid pump 406 is connected to the spray pipe 405. When the second liquid pump 406 is started, the second liquid pump 406 pumps out the liquid in the cooling box 201 and then discharges it into the cooling box 201 through the spray pipe 405. At this time, the liquid in the cooling box 201 is remixed, thereby improving the cooling effect on the oil liquid in the first liquid inlet pipe 204.

[0030] Among them, the spray pipe 405 is a cylindrical tubular structure, and spray holes 407 are formed in a fan-shaped array at the lower position of the outer wall of the spray pipe 405. The liquid sprayed from the fan-shaped array of spray holes 407 can expand the mixing effect of the liquid in the cooling box 201.

[0031] Among them, a replenishing component 5 is fixed to the top end surface of the fixing seat 1. The replenishing component 5 is composed of a liquid storage tank 501, a liquid supply pipe 502, a guide rod 503, and a floating block 504. A liquid storage tank 501 is fixed to the top end surface of the fixing seat 1, and a liquid supply pipe 502 is connected to the liquid storage tank 501. The other end of the liquid supply pipe 502 is connected to the cooling box 201; a guide rod 503 slides on the cover plate 202, and the lower end of the guide rod 503 is fixed to the floating block 504. The left end surface of the floating block 504 contacts the left end surface of the inner wall of the liquid storage tank 501. When the floating block 504 slides upward, the liquid supply pipe 502 can be sealed. During use, when the liquid in the cooling box 201 gradually decreases, the liquid in the liquid storage tank 501 can be replenished through the liquid supply pipe 502. When the replenishment is sufficient, the floating block 504 seals the liquid supply pipe 502 under the action of buoyancy, and the replenishment stops automatically at this time.

[0032] Embodiment 2, on the basis of Embodiment 1, as Figures 1 - 8 shown, a control box 6 is fixed to the top end surface of the fixing seat 1. A microprocessor 601 is installed in the control box 6, and a temperature sensor 602 is installed on the front end surface of the mixing plate 402. The temperature sensor 602 is electrically connected to the microprocessor 601. During use, the temperature sensor 602 transmits temperature information to the microprocessor 601 in real time. When the temperature information is higher than the threshold value in the microprocessor 601, the microprocessor 601 increases the power of the first liquid pump 203. At this time, the first liquid pump 203 increases the circulation speed, thereby improving the circulation cooling effect of the oil liquid in the first liquid inlet pipe 204. When the temperature information is lower than the threshold value in the microprocessor 601, the microprocessor 601 reduces the power of the first liquid pump 203.

[0033] Working principle of this embodiment: The temperature sensor 602 delivers temperature information to the microprocessor 601 in real time. When the temperature information is higher than the threshold value in the microprocessor 601, the microprocessor 601 increases the power of the first liquid pump 203. At this time, the first liquid pump 203 increases the circulation speed, thereby improving the circulation and cooling effect of the oil in the first liquid inlet pipe 204. When the temperature information is lower than the threshold value in the microprocessor 601, the microprocessor 601 reduces the power of the first liquid pump 203; Driven by the first liquid pump 203, the oil in the oil pipe for transformer cooling starts to circulate, and the transformer can be cooled through the circulation. When the oil flows through the area of the cooling box 201, the liquid in the cooling box 201 can complete the cooling of the first liquid inlet pipe 204 and the oil inside the first liquid inlet pipe 204; At the same time, the cooling liquid enters the inside of the cooling box 201 through the second liquid inlet pipe 206 and contacts the first liquid inlet pipe 204 to achieve the cooling of the oil, and then the liquid is discharged through the second drain pipe 207, realizing the secondary cooling of the oil in the first liquid inlet pipe 204; At the same time, the cooling gas enters the cooling pipe 3, and at this time the cold air diffuses around to achieve the cooling of the first liquid inlet pipe 204 and the oil inside; When mixing the liquid in the cooling box 201, the driving motor 403 rotates reciprocally. The motor 403 drives the threaded rod 404 to rotate. Under the reciprocating drive of the threaded rod 404, the sliding frame 401 and the mixing plate 402 can move back and forth, thus realizing the mixing of the liquid in the cooling box 201. Through the mixing of the liquid in the cooling box 201, the cooling of the oil in the first liquid inlet pipe 204 can be better achieved; At the same time, start the second liquid pump 406. The second liquid pump 406 pumps out the liquid in the cooling box 201 and then discharges it into the inside of the cooling box 201 through the nozzle 405. At this time, the liquid in the cooling box 201 is mixed again; At the same time, when the liquid in the cooling box 201 gradually decreases, the liquid in the liquid storage tank 501 can be replenished through the liquid supply pipe 502. When the replenishment is sufficient, the floating block 504 seals the liquid supply pipe 502 under the action of buoyancy, and at this time the replenishment automatically stops.

Claims

1. A control device for a PLC transformer cooling system, characterized in that Comprising: A fixed seat (1); the fixed seat (1) is fixed on the transformer mounting seat, and a cooling box (201) with a rectangular box-like structure is fixed on the top surface of the fixed seat (1). The cooling box (201) is filled with a cooling liquid, and a cover plate (202) is fixed on the top of the cooling box (201); a first liquid pump (203) is fixed on the top surface of the fixed seat (1). A first liquid inlet pipe (204) and a first liquid discharge pipe (205) are connected to the first liquid pump (203). Both the first liquid inlet pipe (204) and the first liquid discharge pipe (205) are connected to the transformer cooling oil pipe. The first liquid inlet pipe (204) passes through the cooling box (201), and the part of the first liquid inlet pipe (204) inside the cooling box (201) has a continuously curved structure.

2. The control device for a PLC transformer cooling system according to claim 1, characterized in that A second liquid inlet pipe (206) is fixed on the top surface of the cover plate (202), and a second liquid discharge pipe (207) is fixed at the front end of the cooling box (201). The second liquid inlet pipe (206) is connected to an external cooling liquid supply pipe, and the second liquid discharge pipe (207) is connected to an external liquid collection box.

3. The control device for a PLC-based transformer cooling system according to claim 2, characterized in that, The cooling box (201), the cover plate (202), the first liquid pump (203), the first liquid inlet pipe (204), the first liquid discharge pipe (205), the second liquid inlet pipe (206) and the second liquid discharge pipe (207) together form a cooling assembly (2); a cooling pipe (3) is fixed inside the cooling box (201), and the cooling pipe (3) is connected to an external cooling gas supply pipe.

4. The control device for a PLC-based transformer cooling system according to claim 3, characterized in that, The cooling pipe (3) is located below the first liquid inlet pipe (204), and the cooling pipe (3) has a wavy structure.

5. The control device for a PLC transformer cooling system according to claim 4, characterized in that, An auxiliary assembly (4) is installed on the cooling box (201). The auxiliary assembly (4) is composed of a sliding frame (401), a mixing plate (402), a motor (403), a threaded rod (404), a spray pipe (405), a second liquid pump (406) and spray holes (407). A sliding frame (401) slides on the cooling box (201). One end of the front side of the sliding frame (401) is fixed with a mixing plate (402). The mixing plate (402) is located inside the cooling box (201). A motor (403) is fixed on the rear end face of the cooling box (201). A threaded rod (404) is fixed on the output shaft of the motor (403), and the threaded rod (404) is threadedly connected to the sliding frame (401).

6. The control device for a PLC-based transformer cooling system according to claim 5, characterized in that, A spray pipe (405) is fixed on the bottom end face of the mixing plate (402), and a second liquid pump (406) is fixed on the top surface of the fixed seat (1). The liquid inlet pipe of the second liquid pump (406) is located inside the cooling box (201), and the liquid discharge pipe of the second liquid pump (406) is connected to the spray pipe (405).

7. The control device for a PLC transformer cooling system according to claim 6, characterized in that, The spray pipe (405) has a cylindrical tubular structure, and spray holes (407) are arranged in a fan-shaped array at the lower position of the outer wall of the spray pipe (405).

8. The control device for a PLC transformer cooling system according to claim 7, characterized in that, A replenishing component (5) is fixed on the top end surface of the fixing base (1). The replenishing component (5) is composed of a liquid storage tank (501), a liquid supply pipe (502), a guide rod (503) and a floating block (504). A liquid storage tank (501) is fixed on the top end surface of the fixing base (1). A liquid supply pipe (502) is connected to the liquid storage tank (501). The other end of the liquid supply pipe (502) is connected to the cooling box (201). A guide rod (503) is slidably arranged on the cover plate (202). The lower end of the guide rod (503) is fixed on the floating block (504). The left end surface of the floating block (504) is in contact with the left end surface of the inner wall of the liquid storage tank (501). When the floating block (504) slides upward, the sealing of the liquid supply pipe (502) can be completed.

9. The control device for a PLC-based transformer cooling system according to claim 8, characterized in that, A control box (6) is fixed on the top end surface of the fixing base (1). A microprocessor (601) is installed in the control box (6). A temperature sensor (602) is installed on the front end surface of the mixing plate (402). The temperature sensor (602) is electrically connected to the microprocessor (601).

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