Cooling system for preventing and treating limnoperna fortunei blockage disaster and oil immersed transformer

Abstract

The invention provides a cooling system for preventing and controlling limnoperna fortunei blocking disasters and an oil immersed transformer, and the cooling system comprises at least one cooler, a liquid inlet pipe, a liquid discharge pipe, a switching device and a control module; wherein in the first state, the first end and the third end of the switching device are conducted, and the second end and the fourth end of the switching device are conducted; in the second state, the first end and the fourth end of the switching device are conducted, and the second end and the third end of the switching device are conducted; the control module is used for controlling the switching device to be adjusted to the second state from the first state when the fluid flow of the heat absorption channel is smaller than the preset flow, and the switching device recovers to the first state after preset time. According to the cooling system for preventing and treating the limnoperna fortunei blockage disaster and the oil immersed transformer, flushing of the heat absorption channel is achieved through reverse water supply of the cooler within the preset time, so that the problem of limnoperna fortunei blockage is effectively solved, and then the cooling efficiency of the cooling system is greatly improved.

Description

Technical Field

[0001] The present invention relates to the technical field of blockage prevention and treatment, and in particular to a cooling system and an oil-immersed transformer for preventing and treating blockage disasters caused by freshwater shellfish. Background Art

[0002] Water is taken from the dam and filtered before being supplied to each cooling system. Although the filter can filter out a certain volume of impurities and aquatic organisms, it cannot filter out tiny aquatic organisms. After tiny aquatic organisms and their eggs enter the cooler, they attach, reproduce, and grow in some places, eventually forming a disaster, blocking the cooler flow channel, reducing cooling efficiency, and affecting the safe operation of equipment. Considering that all cooler systems in the power plant have freshwater shellfish disasters, the blockage of the oil-immersed transformer cooling system is particularly serious. Summary of the invention

[0003] The present disclosure aims to solve one of the technical problems in the related art at least to some extent.

[0004] To this end, the purpose of the present disclosure is to provide a cooling system and an oil-immersed transformer for preventing and controlling the blockage disaster of freshwater shellfish.

[0005] To achieve the above-mentioned purpose, the first aspect of the present disclosure provides a cooling system for preventing and controlling freshwater shellfish blockage disasters, comprising: at least one cooler, a liquid inlet pipe, a liquid discharge pipe, a switching device and a control module; wherein the cooler comprises: a heat absorption channel and a heat release channel for heat exchange; the first end of the switching device is connected to the liquid outlet end of the liquid inlet pipe, and the second end of the switching device is connected to the liquid inlet end of the liquid discharge pipe, the third end of the switching device is connected to the liquid inlet end of the heat absorption channel, and the fourth end of the switching device is connected to the liquid outlet end of the heat absorption channel; when in the first state, the first end and the third end of the switching device are connected, and the second end and the fourth end are connected; when in the second state, the first end and the fourth end of the switching device are connected, and the second end and the third end are connected; the control module is used to control the switching device to adjust from the first state to the second state when the fluid flow rate of the heat absorption channel is less than a preset flow rate, and then restore to the first state after a preset time.

[0006] Optionally, the switching device includes: a three-position four-way reversing valve, wherein the P port of the three-position four-way reversing valve is connected to the liquid outlet end of the liquid inlet pipe as the first end, and the T port of the three-position four-way reversing valve is connected to the liquid inlet end of the discharge pipe as the second end, the A port of the three-position four-way reversing valve is connected to the liquid inlet end of the heat absorption channel as the third end, and the B port of the three-position four-way reversing valve is connected to the liquid outlet end of the heat absorption channel as the fourth end; wherein, when in the first state, the P port and the A port of the three-position four-way reversing valve are connected, and the T port and the B port are connected; when in the second state, the P port and the B port of the three-position four-way reversing valve are connected, and the T port and the A port are connected; the signal input end of the three-position four-way reversing valve is connected to the signal output end of the control module, and the control module is used to control the three-position four-way reversing valve to adjust from the first state to the second state when the fluid flow rate of the heat absorption channel is less than the preset flow rate, and then restore to the first state after the preset time.

[0007] Optionally, the switching device includes: a first valve body, a second valve body, a third valve body and a fourth valve body, the liquid inlet end of the first valve body and the liquid inlet end of the second valve body being connected to the liquid outlet end of the liquid inlet pipe as the first end, and the liquid outlet end of the third valve body and the liquid outlet end of the fourth valve body being connected to the liquid inlet end of the discharge pipe as the second end, the liquid outlet end of the first valve body and the liquid inlet end of the fourth valve body being connected to the liquid inlet end of the heat absorption channel as the third end, and the liquid outlet end of the second valve body and the liquid inlet end of the third valve body being connected to the liquid outlet end of the heat absorption channel as the fourth end; wherein, when in the first state, the first valve body and the third valve body are conductive , and the second valve body and the fourth valve body are disconnected; when in the second state, the first valve body and the third valve body are disconnected, and the second valve body and the fourth valve body are connected; the signal input end of the first valve body, the signal input end of the second valve body, the signal input end of the third valve body and the signal input end of the fourth valve body are respectively connected to the signal output end of the control module, and the control module is used to control the first valve body, the second valve body, the third valve body and the fourth valve body to adjust from the first state to the second state when the fluid flow rate of the heat absorption channel is less than a preset flow rate, and then restore to the first state after the preset time.

[0008] Optionally, the cooling system further includes: a flow detection module, which is arranged on the drain pipe, and a signal output end of the flow detection module is connected to a signal input end of the control module, and the flow detection module is used to detect the fluid flow in the heat absorption channel.

[0009] Optionally, the cooling system also includes: a pressure detection module, which is arranged on the liquid inlet pipe, and the signal output end of the pressure detection module is connected to the signal input end of the control module, and the pressure detection module is used to detect the fluid pressure of the heat absorption channel.

[0010] Optionally, the cooler also includes: a water flow indicator, which is arranged between the fourth end of the switching device and the liquid outlet end of the heat absorption channel, and the liquid inlet end of the water flow indicator is connected to the liquid outlet end of the heat absorption channel, the liquid outlet end of the water flow indicator is connected to the fourth end of the switching device, and the signal output end of the water flow indicator is connected to the signal input end of the control module.

[0011] Optionally, the cooler also includes: a fifth valve body, which is arranged between the third end of the switching device and the liquid inlet end of the heat absorption channel, and the liquid inlet end of the fifth valve body is connected to the third end of the switching device, and the liquid outlet end of the fifth valve body is connected to the liquid inlet end of the heat absorption channel.

[0012] Optionally, the cooler also includes: a sixth valve body, which is arranged between the fourth end of the switching device and the liquid outlet end of the heat absorption channel, and the liquid inlet end of the sixth valve body is connected to the liquid outlet end of the heat absorption channel, and the liquid outlet end of the sixth valve body is connected to the fourth end of the switching device.

[0013] Optionally, the at least one cooler includes: a first cooler, the first cooler including: a first heat absorption channel and a first heat release channel for heat exchange; a second cooler, the second cooler including: a second heat absorption channel and a second heat release channel for heat exchange; a third cooler, the third cooler including: a third heat absorption channel and a third heat release channel for heat exchange; wherein the third end of the switching device is respectively connected to the liquid inlet end of the first heat absorption channel, the liquid inlet end of the second heat absorption channel and the liquid inlet end of the third heat absorption channel, and the fourth end of the switching device is respectively connected to the liquid outlet end of the first heat absorption channel, the liquid outlet end of the second heat absorption channel and the liquid outlet end of the third heat absorption channel.

[0014] A second aspect of the present disclosure provides an oil-immersed transformer, comprising: a cooling system for preventing and controlling blockage disasters caused by freshwater shellfish as provided in the first aspect of the present disclosure.

[0015] The technical solution provided by the present disclosure may have the following beneficial effects:

[0016] Since the first end of the switching device is connected to the liquid outlet end of the liquid inlet pipe, and the second end of the switching device is connected to the liquid inlet end of the discharge pipe, the third end of the switching device is connected to the liquid inlet end of the heat absorption channel, and the fourth end of the switching device is connected to the liquid outlet end of the heat absorption channel, when the first end and the third end of the switching device are connected, and the second end and the fourth end are connected, the passage between the liquid outlet end of the liquid inlet pipe and the liquid inlet end of the heat absorption channel is connected, and the passage between the liquid outlet end of the heat absorption channel and the liquid inlet end of the discharge pipe is connected, so that the cooling water can flow from the liquid inlet end to the liquid outlet end of the heat absorption channel, thereby realizing the forward water supply of the cooler; when the first end and the fourth end of the switching device are connected, and the second end and the third end are connected, the passage between the liquid outlet end of the liquid inlet pipe and the liquid outlet end of the heat absorption channel is connected, and the passage between the liquid inlet end of the heat absorption channel and the liquid inlet end of the discharge pipe is connected, so that the cooling water can flow from the liquid outlet end to the liquid inlet end of the heat absorption channel, thereby realizing the reverse water supply of the cooler. Moreover, when the fluid flow rate in the heat absorption channel is less than the preset flow rate, the control module controls the switching device to adjust from the first state to the second state, and then restores to the first state after a preset time. The heat absorption channel is flushed by utilizing the reverse water supply of the cooler within the preset time, thereby effectively reducing the blockage problem of freshwater shell vegetables, thereby greatly improving the cooling efficiency of the cooling system and ensuring the safe operation of equipment such as oil-immersed transformers.

[0017] Additional aspects and advantages of the present disclosure will be given in part in the following description and in part will be obvious from the following description or learned through practice of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The above and / or additional aspects and advantages of the present disclosure will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0019] Figure 1 It is a structural schematic diagram of a cooling system for preventing and controlling the blockage disaster of freshwater shellfish proposed in an embodiment of the present disclosure (three-position four-way reversing valve);

[0020] Figure 2 It is a structural schematic diagram of a cooling system for preventing and controlling the blockage disaster of freshwater shellfish proposed in an embodiment of the present disclosure (first valve body to fourth valve body);

[0021] As shown in the figure: 1. cooler, 11. heat absorption channel, 12. heat release channel, 13. water flow indicator, 14. fifth valve body, 15. sixth valve body;

[0022] 2. Liquid inlet pipe, 3. Liquid discharge pipe;

[0023] 4. Switching device, 41. Three-position four-way reversing valve, 42. First valve body, 43. Second valve body, 44. Third valve body, 45. Fourth valve body;

[0024] 5. Flow detection module, 6. Pressure detection module. DETAILED DESCRIPTION

[0025] Embodiments of the present disclosure are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present disclosure, and are not to be construed as limitations of the present disclosure. On the contrary, the embodiments of the present disclosure include all changes, modifications, and equivalents that fall within the spirit and connotation of the appended claims.

[0026] like Figure 1 and Figure 2 As shown, the embodiment of the present disclosure proposes a cooling system for preventing and controlling the blockage disaster of freshwater shellfish, including: at least one cooler 1, a liquid inlet pipe 2, a liquid discharge pipe 3, a switching device 4 and a control module (not shown in the figure). Among them, the cooler 1 includes: a heat absorption channel 11 and a heat release channel 12 for heat exchange, the first end of the switching device 4 is connected to the liquid outlet end of the liquid inlet pipe 2, and the second end of the switching device 4 is connected to the liquid inlet end of the liquid discharge pipe 3, the third end of the switching device 4 is connected to the liquid inlet end of the heat absorption channel 11, and the fourth end of the switching device 4 is connected to the liquid outlet end of the heat absorption channel 11.

[0027] When in the first state, the first end and the third end of the switching device 4 are connected, and the second end and the fourth end are connected; when in the second state, the first end and the fourth end of the switching device 4 are connected, and the second end and the third end are connected. The control module is used to control the switching device 4 to adjust from the first state to the second state when the fluid flow rate of the heat absorption channel 11 is less than the preset flow rate, and then restore to the first state after a preset time.

[0028] It can be understood that, since the first end of the switching device 4 is connected to the liquid outlet end of the liquid inlet pipe 2, and the second end of the switching device 4 is connected to the liquid inlet end of the liquid discharge pipe 3, the third end of the switching device 4 is connected to the liquid inlet end of the heat absorption channel 11, and the fourth end of the switching device 4 is connected to the liquid outlet end of the heat absorption channel 11, when the first end and the third end of the switching device 4 are connected, and the second end and the fourth end are connected, the passage between the liquid outlet end of the liquid inlet pipe 2 and the liquid inlet end of the heat absorption channel 11 is connected, and the passage between the liquid outlet end of the heat absorption channel 11 and the liquid inlet end of the liquid discharge pipe 3 is connected. The passage between them is connected, so that the cooling water can flow from the liquid inlet end to the liquid outlet end of the heat absorption channel 11, thereby realizing the forward water supply of the cooler 1; when the first end and the fourth end of the switching device 4 are connected, and the second end and the third end are connected, the passage between the liquid outlet end of the inlet pipe 2 and the liquid outlet end of the heat absorption channel 11 is connected, and the passage between the liquid inlet end of the heat absorption channel 11 and the liquid inlet end of the discharge pipe 3 is connected, so that the cooling water can flow from the liquid outlet end to the liquid inlet end of the heat absorption channel 11, thereby realizing the reverse water supply of the cooler 1.

[0029] Moreover, when the fluid flow rate of the heat absorption channel 11 is less than the preset flow rate, the control module controls the switching device 4 to adjust from the first state to the second state, and then restores to the first state after a preset time, thereby utilizing the reverse water supply of the cooler 1 within the preset time to achieve flushing of the heat absorption channel 11, thereby effectively reducing the blockage problem of freshwater shell vegetables, thereby greatly improving the cooling efficiency of the cooling system, and ensuring the safe operation of equipment such as oil-immersed transformers.

[0030] It should be noted that freshwater shellfish are produced in freshwater rivers and lakes, attached to exported aquatic products, the hulls of ocean-going merchant ships or in ballast water, and are brought to the port, where they reproduce and grow in large numbers in areas with suitable conditions and expand inland. The expansion speed varies in different regions.

[0031] The size of mature freshwater shellfish is generally 8mm-30mm, and the larvae are generally only a few hundred microns. After the larvae metamorphose and attach, they generally no longer move, and passively filter organic particles, algae and lower animals in the water with gills. The rich food source and suitable growth environment promote their large-scale growth and reproduction. The growth cycle is short, and the impact on the water body is serious. Its growth is also affected by external environmental conditions such as temperature, salinity, light, and water quality. The water temperature in the living area is 14℃-32.6℃, the pH range is 6.2-7.4, and the Ca2+ concentration is 3.96mg / L. The salinity in the water is generally lower than 3pus. It has a greater adaptability to temperature changes and a strong resistance to dryness. It also has a strong adaptability to changes in salinity, but too high or too low salinity will also affect their survival and reproduction. The larvae react more obviously to light intensity during the larval period. Generally, they are evenly distributed under weak light. Strong light can cause the movement and distribution of larvae, and even cause the accumulation and death of larvae. Generally, adults have no obvious response to light intensity. Even in dark water pipes, as long as food is abundant, they can still grow rapidly and have a short maturity period.

[0032] For the cooling system in the oil-immersed transformer, when the freshwater shellfish blocks the cooler 1, the cooling efficiency will be reduced, the temperature of the oil-immersed transformer insulating oil will rise, and the winding temperature will also rise accordingly, shortening the service life of the transformer and affecting the safe and stable operation of the transformer. In severe cases, the transformer will not be able to operate at the rated load, and the transformer may even trip or be forced to stop operating due to excessive operating temperature.

[0033] From the analysis of the location of equipment where freshwater shellfish are seriously blocked, it is found that the seriously blocked parts are basically at the end of the water supply pipe and the first section of the drainage pipe. The flow state of cooling water in this part has changed, and most of the organic particles, algae and low-level plankton in the water body are alluvial to this part. Although the cooling water system is equipped with filters, etc., the size of mature freshwater shellfish is generally 8-30mm, and the larvae are generally only a few hundred μm. After the larvae metamorphose and attach, they generally no longer move, so the blockage location of freshwater shellfish is in line with its attachment and growth rules.

[0034] Combined with the operation data and maintenance analysis of the cooling system in the oil-immersed transformer, it was found that the most serious blockages in the cooling system occurred at the farthest end of the water supply pipeline, where the flow change was most obvious. Therefore, through reverse water supply, the end of the water supply pipeline in the cooling system can be converted to the front end, and then restored to the end after a preset time. In this way, while achieving cooling, it can also effectively prevent and control the blockage disaster of freshwater shell vegetables.

[0035] The cooler 1 is used to achieve cooling by utilizing heat exchange between the heat absorption channel 11 and the heat release channel 12. Specifically, cooling water with a relatively low temperature is introduced into the heat absorption channel 11 of the cooler 1, while oil is introduced into the heat release channel 12 of the cooler 1. The heat absorption channel 11 absorbs heat from the heat release channel 12, thereby achieving cooling of the oil by the cooling water. The specific type of the cooler 1 can be set according to actual needs and is not limited to this.

[0036] The liquid inlet pipe 2 is used to introduce cooling water. The specific type of the liquid inlet pipe 2 can be set according to actual needs and is not limited to this.

[0037] The drain pipe 3 is used to discharge the cooling water that releases cold energy. The specific type of the drain pipe 3 can be set according to actual needs and is not limited to this.

[0038] The switching device 4 is used to switch the water path to realize forward water supply and reverse water supply of the cooler 1. The specific type of the switching device 4 can be set according to actual needs and is not limited to this.

[0039] The control module is used to control the state switching of the switching device 4 according to the fluid flow control of the heat absorption channel 11. The specific type of the control module can be set according to actual needs and is not limited to this. For example, the control module can be a controller.

[0040] The preset time can be set according to actual needs, and there is no limitation on this. For example, the preset time range can be 5 minutes to 10 minutes.

[0041] like Figure 1 As shown, in some embodiments, the switching device 4 includes: a three-position four-way reversing valve 41, the P port of the three-position four-way reversing valve 41 is connected to the liquid outlet of the liquid inlet pipe 2 as the first end, and the T port of the three-position four-way reversing valve 41 is connected to the liquid inlet end of the liquid discharge pipe 3 as the second end, the A port of the three-position four-way reversing valve 41 is connected to the liquid inlet end of the heat absorption channel 11 as the third end, and the B port of the three-position four-way reversing valve 41 is connected to the liquid outlet end of the heat absorption channel 11 as the fourth end. In the first state, the P port and the A port of the three-position four-way reversing valve 41 are connected, and the T port and the B port are connected; in the second state, the P port and the B port of the three-position four-way reversing valve 41 are connected, and the T port and the A port are connected.

[0042] The signal input end of the three-position four-way reversing valve 41 is connected to the signal output end of the control module, and the control module is used to control the three-position four-way reversing valve 41 to adjust from the first state to the second state when the fluid flow rate in the heat absorption channel 11 is less than the preset flow rate, and then restore to the first state after a preset time.

[0043] It can be understood that, since the P port of the three-position four-way reversing valve 41 is connected to the liquid outlet end of the liquid inlet pipe 2 as the first end, and the T port of the three-position four-way reversing valve 41 is connected to the liquid inlet end of the discharge pipe 3 as the second end, the A port of the three-position four-way reversing valve 41 is connected to the liquid inlet end of the heat absorption channel 11 as the third end, and the B port of the three-position four-way reversing valve 41 is connected to the liquid outlet end of the heat absorption channel 11 as the fourth end, when the P port and the A port of the three-position four-way reversing valve 41 are connected, and the T port and the B port are connected, the passage between the liquid outlet end of the liquid inlet pipe 2 and the liquid inlet end of the heat absorption channel 11 is connected, and the absorption channel 11 is connected to the liquid outlet end of the heat absorption channel 11. The passage between the liquid outlet end of the hot channel 11 and the liquid inlet end of the drain pipe 3 is connected, so that the cooling water can flow from the liquid inlet end to the liquid outlet end of the heat absorption channel 11, thereby realizing the forward water supply of the cooler 1; when the P port and the B port of the three-position four-way reversing valve 41 are connected, and the T port and the A port are connected, the passage between the liquid outlet end of the inlet pipe 2 and the liquid outlet end of the heat absorption channel 11 is connected, and the passage between the liquid inlet end of the heat absorption channel 11 and the liquid inlet end of the drain pipe 3 is connected, so that the cooling water can flow from the liquid outlet end to the liquid inlet end of the heat absorption channel 11, thereby realizing the reverse water supply of the cooler 1.

[0044] Moreover, when the fluid flow rate of the heat absorption channel 11 is less than the preset flow rate, the control module controls the three-position four-way reversing valve 41 to adjust from the first state to the second state, and then restores to the first state after a preset time. In this way, the heat absorption channel 11 is flushed by utilizing the reverse water supply of the cooler 1 within the preset time, thereby effectively reducing the blockage problem of freshwater shell vegetables, thereby greatly improving the cooling efficiency of the cooling system and ensuring the safe operation of equipment such as oil-immersed transformers.

[0045] It should be noted that the three-position four-way reversing valve 41 has three working positions and four oil ports, namely, port P, port T, port A and port B. The natural position of the three-position four-way reversing valve 41 is at the middle position, and the specific type of the three-position four-way reversing valve 41 can be set according to actual needs, and there is no limitation on this.

[0046] like Figure 2As shown, in some embodiments, the switching device 4 includes: a first valve body 42, a second valve body 43, a third valve body 44 and a fourth valve body 45, the liquid inlet end of the first valve body 42 and the liquid inlet end of the second valve body 43 are connected to the liquid outlet end of the liquid inlet pipe 2 as the first end, and the liquid outlet end of the third valve body 44 and the liquid outlet end of the fourth valve body 45 are connected to the liquid inlet end of the liquid discharge pipe 3 as the second end, the liquid outlet end of the first valve body 42 and the liquid inlet end of the fourth valve body 45 are connected to the liquid inlet end of the heat absorption channel 11 as the third end, and the liquid outlet end of the second valve body 43 and the liquid inlet end of the third valve body 44 are connected to the liquid outlet end of the heat absorption channel 11 as the fourth end. In the first state, the first valve body 42 and the third valve body 44 are connected, and the second valve body 43 and the fourth valve body 45 are disconnected; in the second state, the first valve body 42 and the third valve body 44 are disconnected, and the second valve body 43 and the fourth valve body 45 are connected.

[0047] The signal input end of the first valve body 42, the signal input end of the second valve body 43, the signal input end of the third valve body 44 and the signal input end of the fourth valve body 45 are respectively connected to the signal output end of the control module, and the control module is used to control the first valve body 42, the second valve body 43, the third valve body 44 and the fourth valve body 45 to adjust from the first state to the second state when the fluid flow rate of the heat absorption channel 11 is less than the preset flow rate, and then restore to the first state after a preset time.

[0048] It can be understood that, since the liquid inlet end of the first valve body 42 and the liquid inlet end of the second valve body 43 are connected to the liquid outlet end of the liquid inlet pipe 2 as the first end, and the liquid outlet end of the third valve body 44 and the liquid outlet end of the fourth valve body 45 are connected to the liquid inlet end of the discharge pipe 3 as the second end, the liquid outlet end of the first valve body 42 and the liquid inlet end of the fourth valve body 45 are connected to the liquid inlet end of the heat absorption channel 11 as the third end, and the liquid outlet end of the second valve body 43 and the liquid inlet end of the third valve body 44 are connected to the liquid outlet end of the heat absorption channel 11 as the fourth end, so that when the first valve body 42 and the third valve body 44 are connected, and the second valve body 43 and the fourth valve body 45 are disconnected, the liquid outlet end of the liquid inlet pipe 2 and the heat absorption channel 11 are connected. The passage between the liquid inlet end of the heat absorption channel 11 is connected, as well as the passage between the liquid outlet end of the heat absorption channel 11 and the liquid inlet end of the discharge pipe 3 is connected, so that the cooling water can flow from the liquid inlet end to the liquid outlet end of the heat absorption channel 11, thereby realizing the forward water supply of the cooler 1; when the first valve body 42 and the third valve body 44 are disconnected, and the second valve body 43 and the fourth valve body 45 are connected, the passage between the liquid outlet end of the inlet pipe 2 and the liquid outlet end of the heat absorption channel 11 is connected, as well as the passage between the liquid inlet end of the heat absorption channel 11 and the liquid inlet end of the discharge pipe 3 is connected, so that the cooling water can flow from the liquid outlet end to the liquid inlet end of the heat absorption channel 11, thereby realizing the reverse water supply of the cooler 1.

[0049] Moreover, when the fluid flow rate of the heat absorption channel 11 is less than the preset flow rate, the control module controls the first valve body 42, the second valve body 43, the third valve body 44 and the fourth valve body 45 to adjust from the first state to the second state, and then restore to the first state after the preset time. In this way, the heat absorption channel 11 is flushed by utilizing the reverse water supply of the cooler 1 within the preset time, thereby effectively reducing the blockage problem of freshwater shell vegetables, thereby greatly improving the cooling efficiency of the cooling system and ensuring the safe operation of equipment such as oil-immersed transformers.

[0050] It should be noted that the first valve body 42 is used to control the passage between the liquid outlet end of the liquid inlet pipe 2 and the liquid inlet end of the heat absorption channel 11. The specific type of the first valve body 42 can be set according to actual needs and is not limited to this. For example, the first valve body 42 can be an electromagnetic switch valve.

[0051] The second valve body 43 is used to control the passage between the liquid outlet end of the liquid inlet pipe 2 and the liquid outlet end of the heat absorption channel 11. The specific type of the second valve body 43 can be set according to actual needs and is not limited to this. For example, the second valve body 43 can be an electromagnetic switch valve.

[0052] The third valve body 44 is used to control the passage between the liquid inlet end of the discharge pipe 3 and the liquid outlet end of the heat absorption channel 11. The specific type of the third valve body 44 can be set according to actual needs and is not limited to this. For example, the third valve body 44 can be an electromagnetic switch valve.

[0053] The fourth valve body 45 is used to control the passage between the liquid inlet end of the discharge pipe 3 and the liquid inlet end of the heat absorption channel 11. The specific type of the fourth valve body 45 can be set according to actual needs and is not limited to this. For example, the fourth valve body 45 can be an electromagnetic switch valve.

[0054] like Figure 1 and Figure 2 As shown, in some embodiments, the cooling system also includes: a flow detection module 5, the flow detection module 5 is arranged on the drain pipe 3, and the signal output end of the flow detection module 5 is connected to the signal input end of the control module, and the flow detection module 5 is used to detect the fluid flow of the heat absorption channel 11.

[0055] It can be understood that since the flow detection module 5 is arranged on the discharge pipe 3, and the signal output end of the flow detection module 5 is connected to the signal input end of the control module, the flow detection module 5 can detect the fluid flow of the heat absorption channel 11 and send the detected fluid flow signal to the control module, so that the control module can control the state switching of the switching device 4 according to the fluid flow of the heat absorption channel 11.

[0056] It should be noted that the flow detection module 5 is used to detect the fluid flow in the heat absorption channel 11. The specific type of the flow detection module 5 can be set according to actual needs and is not limited to this. For example, the flow detection module 5 can be a flow meter.

[0057] like Figure 1 and Figure 2 As shown, in some embodiments, the cooling system also includes: a pressure detection module 6, the pressure detection module 6 is arranged on the liquid inlet pipe 2, and the signal output end of the pressure detection module 6 is connected to the signal input end of the control module, and the pressure detection module 6 is used to detect the fluid pressure of the heat absorption channel 11.

[0058] It can be understood that since the pressure detection module 6 is arranged on the liquid inlet pipe 2, and the signal output end of the pressure detection module 6 is connected to the signal input end of the control module, the pressure detection module 6 can detect the fluid pressure of the heat absorption channel 11 and send the detected fluid pressure signal to the control module, so that the control module can monitor the fluid pressure, thereby ensuring a higher cooling efficiency of the cooling system.

[0059] It should be noted that the pressure detection module 6 is used to detect the fluid pressure of the heat absorption channel 11. The specific type of the pressure detection module 6 can be set according to actual needs and is not limited to this. For example, the pressure detection module 6 can be a pressure gauge.

[0060] like Figure 1 and Figure 2 As shown, in some embodiments, the cooler 1 also includes: a water flow indicator 13, which is arranged between the fourth end of the switching device 4 and the liquid outlet end of the heat absorption channel 11, and the liquid inlet end of the water flow indicator 13 is connected to the liquid outlet end of the heat absorption channel 11, the liquid outlet end of the water flow indicator 13 is connected to the fourth end of the switching device 4, and the signal output end of the water flow indicator 13 is connected to the signal input end of the control module.

[0061] It can be understood that, since the liquid inlet end of the water flow indicator 13 is connected to the liquid outlet end of the heat absorption channel 11, and the liquid outlet end of the water flow indicator 13 is connected to the fourth end of the switching device 4, the signal output end of the water flow indicator 13 is connected to the signal input end of the control module, so that the water flow indicator 13 can detect the water flow between the liquid outlet end of the heat absorption channel 11 and the fourth end of the switching device 4 and send the detected water flow signal to the control module, so that the control module can monitor the water flow, thereby ensuring a higher cooling efficiency of the cooling system.

[0062] It should be noted that the water flow indicator 13 is used to detect whether there is water flow between the liquid outlet end of the heat absorption channel 11 and the fourth end of the switching device 4. The specific type of the water flow indicator 13 can be set according to actual needs and is not limited to this. Among them, the water flow indicator 13 can also detect the direction of the water flow.

[0063] like Figure 1 and Figure 2 As shown, in some embodiments, the cooler 1 also includes: a fifth valve body 14, which is arranged between the third end of the switching device 4 and the liquid inlet end of the heat absorption channel 11, and the liquid inlet end of the fifth valve body 14 is connected to the third end of the switching device 4, and the liquid outlet end of the fifth valve body 14 is connected to the liquid inlet end of the heat absorption channel 11.

[0064] It can be understood that since the liquid inlet end of the fifth valve body 14 is connected to the third end of the switching device 4, and the liquid outlet end of the fifth valve body 14 is connected to the liquid inlet end of the heat absorption channel 11, the fifth valve body 14 can control the opening and closing of the passage between the third end of the switching device 4 and the liquid inlet end of the heat absorption channel 11, thereby making the use of the cooler 1 more flexible and convenient.

[0065] It should be noted that the fifth valve body 14 is used to control the on-off of the passage between the third end of the switching device 4 and the liquid inlet end of the heat absorption channel 11. The specific type of the fifth valve body 14 can be set according to actual needs and is not limited to this. For example, the fifth valve body 14 can be an electromagnetic switch valve.

[0066] like Figure 1 and Figure 2 As shown, in some embodiments, the cooler 1 also includes: a sixth valve body 15, the sixth valve body 15 is arranged between the fourth end of the switching device 4 and the liquid outlet end of the heat absorption channel 11, and the liquid inlet end of the sixth valve body 15 is connected to the liquid outlet end of the heat absorption channel 11, and the liquid outlet end of the sixth valve body 15 is connected to the fourth end of the switching device 4.

[0067] It can be understood that since the liquid inlet end of the sixth valve body 15 is connected to the liquid outlet end of the heat absorption channel 11, and the liquid outlet end of the sixth valve body 15 is connected to the fourth end of the switching device 4, the sixth valve body 15 can control the opening and closing of the passage between the fourth end of the switching device 4 and the liquid outlet end of the heat absorption channel 11, thereby making the use of the cooler 1 more flexible and convenient.

[0068] It should be noted that the sixth valve body 15 is used to control the on-off of the passage between the fourth end of the switching device 4 and the liquid outlet end of the heat absorption channel 11. The specific type of the sixth valve body 15 can be set according to actual needs and is not limited to this. For example, the sixth valve body 15 can be a butterfly valve.

[0069] Based on the two implementation methods of the switching device 4, specifically, the method of switching using a three-position four-way reversing valve 41 is convenient to operate, but for some usage scenarios, it is necessary to cooperate with the valve body in a single cooler 1 to operate, and even the cooler 1 system control wiring and operation procedures need to be adjusted and optimized, and the use and maintenance costs of the three-position four-way reversing valve 41 are relatively high, and the market application volume is small; the method of switching using the first valve body 42, the second valve body 43, the third valve body 44 and the fourth valve body 45 can also effectively solve the problem of freshwater shellfish blockage in the heat absorption channel 11 of the cooler 1, and the overall operation only requires the installation of valves on the water supply and drainage pipelines for simple adjustment and optimization, and the construction and maintenance costs are low, but the operation of multiple valves is relatively complicated, and there is a risk of misoperation.

[0070] The above two methods can both achieve the purpose of effectively treating the situation where freshwater shellfish blocks the cooler 1, and can be selected and adapted according to actual needs.

[0071] In some embodiments, at least one cooler 1 includes: a first cooler, a second cooler and a third cooler, the first cooler includes: a first heat absorption channel and a first heat release channel for heat exchange, the second cooler includes: a second heat absorption channel and a second heat release channel for heat exchange, and the third cooler includes: a third heat absorption channel and a third heat release channel for heat exchange. Among them, the third end of the switching device 4 is respectively connected to the liquid inlet end of the first heat absorption channel, the liquid inlet end of the second heat absorption channel and the liquid inlet end of the third heat absorption channel, and the fourth end of the switching device 4 is respectively connected to the liquid outlet end of the first heat absorption channel, the liquid outlet end of the second heat absorption channel and the liquid outlet end of the third heat absorption channel.

[0072] It can be understood that, since the third end of the switching device 4 is respectively connected to the liquid inlet end of the first heat absorption channel, the liquid inlet end of the second heat absorption channel and the liquid inlet end of the third heat absorption channel, and the fourth end of the switching device 4 is respectively connected to the liquid outlet end of the first heat absorption channel, the liquid outlet end of the second heat absorption channel and the liquid outlet end of the third heat absorption channel, when the first end and the third end of the switching device 4 are connected, and the second end and the fourth end are connected, the liquid outlet end of the liquid inlet pipe 2 is respectively connected to the passage between the liquid inlet end of the first heat absorption channel, the liquid inlet end of the second heat absorption channel and the liquid inlet end of the third heat absorption channel, and the liquid outlet end of the first heat absorption channel, the liquid outlet end of the second heat absorption channel and the liquid outlet end of the third heat absorption channel are respectively connected to the passage between the liquid inlet end of the drain pipe 3, so that the cooling water can flow in the direction from the liquid inlet end to the liquid outlet end of the first heat absorption channel, and from the liquid inlet end to the outlet end of the second heat absorption channel. The cooling water flows in the direction of the liquid end and in the direction from the liquid inlet end to the liquid outlet end of the third heat absorption channel, thereby realizing the forward water supply to the first cooler, the second cooler and the third cooler; when the first end and the fourth end of the switching device 4 are connected, and the second end and the third end are connected, the liquid outlet end of the liquid inlet pipe 2 is respectively connected with the passages between the liquid outlet end of the first heat absorption channel, the liquid outlet end of the second heat absorption channel and the liquid outlet end of the third heat absorption channel, and the liquid inlet end of the first heat absorption channel, the liquid inlet end of the second heat absorption channel and the liquid inlet end of the third heat absorption channel are respectively connected with the passages between the liquid inlet end of the discharge pipe 3, so that the cooling water can flow in the direction from the liquid outlet end to the liquid inlet end of the first heat absorption channel, the direction from the liquid outlet end to the liquid inlet end of the second heat absorption channel and the direction from the liquid outlet end to the liquid inlet end of the third heat absorption channel, thereby realizing the reverse water supply to the first cooler, the second cooler and the third cooler.

[0073] The disclosed embodiment also provides an oil-immersed transformer, including: a cooling system for preventing and controlling the blockage disaster of freshwater shellfish as in the disclosed embodiment.

[0074] It can be understood that, since the first end of the switching device 4 is connected to the liquid outlet end of the liquid inlet pipe 2, and the second end of the switching device 4 is connected to the liquid inlet end of the liquid discharge pipe 3, the third end of the switching device 4 is connected to the liquid inlet end of the heat absorption channel 11, and the fourth end of the switching device 4 is connected to the liquid outlet end of the heat absorption channel 11, when the first end and the third end of the switching device 4 are connected, and the second end and the fourth end are connected, the passage between the liquid outlet end of the liquid inlet pipe 2 and the liquid inlet end of the heat absorption channel 11 is connected, and the passage between the liquid outlet end of the heat absorption channel 11 and the liquid inlet end of the liquid discharge pipe 3 is connected. The passage between them is connected, so that the cooling water can flow from the liquid inlet end to the liquid outlet end of the heat absorption channel 11, thereby realizing the forward water supply of the cooler 1; when the first end and the fourth end of the switching device 4 are connected, and the second end and the third end are connected, the passage between the liquid outlet end of the inlet pipe 2 and the liquid outlet end of the heat absorption channel 11 is connected, and the passage between the liquid inlet end of the heat absorption channel 11 and the liquid inlet end of the discharge pipe 3 is connected, so that the cooling water can flow from the liquid outlet end to the liquid inlet end of the heat absorption channel 11, thereby realizing the reverse water supply of the cooler 1.

[0075] Moreover, when the fluid flow rate of the heat absorption channel 11 is less than the preset flow rate, the control module controls the switching device 4 to adjust from the first state to the second state, and then restores to the first state after a preset time, thereby utilizing the reverse water supply of the cooler 1 within the preset time to achieve flushing of the heat absorption channel 11, thereby effectively reducing the blockage problem of freshwater shell vegetables, thereby greatly improving the cooling efficiency of the cooling system and ensuring the safe operation of the oil-immersed transformer.

[0076] It should be noted that the heat release channel 12 of the cooler 1 can be arranged on the low-voltage side of the oil-immersed transformer.

[0077] Based on the oil-immersed transformer of this embodiment, it has been proved through practice that during the period of severe freshwater shell weed disaster, when the cooling water pressure on the low-pressure side of the main transformer gradually increases and the flow rate gradually decreases, the control switching device 4 performs backwashing, and the cooling water flow rate immediately returns to a normal level. This scheme has a good effect on the control of freshwater shell weed blockage, and the scheme has a strong value for promotion and application.

[0078] Since large oil-immersed transformers now have a high degree of automation, when adjusting the valve group for recoil, it is necessary to consider in advance the impact of recoil on automation components, as well as avoid the risk of false protection caused by interruption of cooling air water flow. A special standardized process work order for cooler 1 recoil is formulated, and recoil work is carried out regularly.

[0079] In summary, the 220kV No. 2 main transformer low-pressure side cooler 1 and the 500kV No. 7 coupling transformer B and C phase cooler 1 of a power plant where the freshwater shellfish disaster is more serious are located at the end of the water supply pipeline and the head of the drainage pipeline. Many factors such as the flow state, temperature, and food of the cooler 1 water pipeline meet the conditions for the attachment and growth of freshwater shellfish. The freshwater shellfish grows by adsorption in the pipeline and the water chamber of cooler 1. The inner diameter of the cooler 1 water pipeline is only 15mm, and it is impossible to exclude the mature freshwater shellfish and the shells of the dead adults. The dead shells are blocked in the water inlet tank of cooler 1, so a freshwater shellfish disaster is formed at this location.

[0080] Combined with the analysis of freshwater shellfish control solutions, as well as the demonstration and practice of control methods, the recoil method of this embodiment has been proven in practice to be low-cost and effective. At the same time, based on the long-term control needs of freshwater shellfish, regular recoil strategies and special dangerous point preventive measures are studied and formulated, standardized work orders for recoil operations are formulated, and operational safety risks are reduced. The research results have broad promotion value.

[0081] It should be noted that, in the description of the present disclosure, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In addition, in the description of the present disclosure, unless otherwise specified, the meaning of "plurality" is two or more.

[0082] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, segment or portion of code that includes one or more executable instructions for implementing the steps of a specific logical function or process, and the scope of the preferred embodiments of the present disclosure includes alternative implementations in which functions may not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in the reverse order depending on the functions involved, which should be understood by those skilled in the art to which the embodiments of the present disclosure belong.

[0083] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present disclosure. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0084] Although the embodiments of the present disclosure have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present disclosure. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present disclosure.

Claims

1. A cooling system for preventing and controlling the blockage of freshwater shellfish, characterized in that: include: at least one cooler, a liquid inlet pipe, a liquid discharge pipe, a switching device and a control module; Wherein, the cooler comprises: a heat absorbing channel and a heat releasing channel for heat exchange; The first end of the switching device is connected to the liquid outlet end of the liquid inlet pipe, and the second end of the switching device is connected to the liquid inlet end of the liquid discharge pipe, the third end of the switching device is connected to the liquid inlet end of the heat absorption channel, and the fourth end of the switching device is connected to the liquid outlet end of the heat absorption channel; When in the first state, the first terminal and the third terminal of the switching device are conductive, and the second terminal and the fourth terminal are conductive; When in the second state, the first terminal and the fourth terminal of the switching device are conductive, and the second terminal and the third terminal are conductive; The control module is used to control the switching device to adjust from the first state to the second state when the fluid flow rate of the heat absorption channel is less than a preset flow rate, and then restore to the first state after a preset time.

2. The cooling system for preventing and controlling the blockage disaster of freshwater shellfish according to claim 1, characterized in that: The switching device comprises: A three-position four-way reversing valve, wherein the P port of the three-position four-way reversing valve is connected to the liquid outlet end of the liquid inlet pipe as a first end, and the T port of the three-position four-way reversing valve is connected to the liquid inlet end of the liquid discharge pipe as a second end, the A port of the three-position four-way reversing valve is connected to the liquid inlet end of the heat absorption channel as a third end, and the B port of the three-position four-way reversing valve is connected to the liquid outlet end of the heat absorption channel as a fourth end; Wherein, when in the first state, the P port and the A port of the three-position four-way reversing valve are connected, and the T port and the B port are connected; When in the second state, the P port and the B port of the three-position four-way reversing valve are connected, and the T port and the A port are connected; The signal input end of the three-position four-way reversing valve is connected to the signal output end of the control module, and the control module is used to control the three-position four-way reversing valve to adjust from the first state to the second state when the fluid flow rate of the heat absorption channel is less than the preset flow rate, and then restore to the first state after the preset time.

3. The cooling system for preventing and controlling the blockage disaster of freshwater shellfish according to claim 1, characterized in that: The switching device comprises: a first valve body, a second valve body, a third valve body and a fourth valve body, wherein the liquid inlet end of the first valve body and the liquid inlet end of the second valve body are connected to the liquid outlet end of the liquid inlet pipe as a first end, and the liquid outlet end of the third valve body and the liquid outlet end of the fourth valve body are connected to the liquid inlet end of the liquid discharge pipe as a second end, the liquid outlet end of the first valve body and the liquid inlet end of the fourth valve body are connected to the liquid inlet end of the heat absorption channel as a third end, and the liquid outlet end of the second valve body and the liquid inlet end of the third valve body are connected to the liquid outlet end of the heat absorption channel as a fourth end; Wherein, in the first state, the first valve body and the third valve body are connected, and the second valve body and the fourth valve body are disconnected; In the second state, the first valve body and the third valve body are disconnected, and the second valve body and the fourth valve body are connected; The signal input end of the first valve body, the signal input end of the second valve body, the signal input end of the third valve body and the signal input end of the fourth valve body are respectively connected to the signal output end of the control module, and the control module is used to control the first valve body, the second valve body, the third valve body and the fourth valve body to adjust from the first state to the second state when the fluid flow rate of the heat absorption channel is less than a preset flow rate, and then restore to the first state after the preset time.

4. The cooling system for preventing and controlling the blockage of freshwater shellfish according to claim 1, characterized in that: The cooling system further comprises: A flow detection module, wherein the flow detection module is arranged on the drain pipe, and a signal output end of the flow detection module is connected to a signal input end of the control module, and the flow detection module is used to detect the fluid flow of the heat absorption channel.

5. The cooling system for preventing and controlling the blockage disaster of freshwater shellfish according to claim 1, characterized in that: The cooling system further comprises: A pressure detection module, wherein the pressure detection module is arranged on the liquid inlet pipe, and a signal output end of the pressure detection module is connected to a signal input end of the control module, and the pressure detection module is used to detect the fluid pressure of the heat absorption channel.

6. The cooling system for preventing and controlling the blockage disaster of freshwater shellfish according to claim 1, characterized in that: The cooler also includes: A water flow indicator, wherein the water flow indicator is arranged between the fourth end of the switching device and the liquid outlet end of the heat absorption channel, and the liquid inlet end of the water flow indicator is connected to the liquid outlet end of the heat absorption channel, the liquid outlet end of the water flow indicator is connected to the fourth end of the switching device, and the signal output end of the water flow indicator is connected to the signal input end of the control module.

7. The cooling system for preventing and controlling the blockage of freshwater shellfish according to claim 1, characterized in that: The cooler also includes: The fifth valve body is arranged between the third end of the switching device and the liquid inlet end of the heat absorption channel, and the liquid inlet end of the fifth valve body is connected to the third end of the switching device, and the liquid outlet end of the fifth valve body is connected to the liquid inlet end of the heat absorption channel.

8. The cooling system for preventing and controlling the blockage of freshwater shellfish according to claim 1, characterized in that: The cooler also includes: The sixth valve body is arranged between the fourth end of the switching device and the liquid outlet end of the heat absorption channel, and the liquid inlet end of the sixth valve body is connected to the liquid outlet end of the heat absorption channel, and the liquid outlet end of the sixth valve body is connected to the fourth end of the switching device.

9. The cooling system for preventing and controlling the blockage of freshwater shellfish according to claim 1, characterized in that: The at least one cooler comprises: A first cooler, the first cooler comprising: a first heat absorbing channel and a first heat releasing channel for heat exchange; A second cooler, the second cooler comprising: a second heat absorbing channel and a second heat releasing channel for heat exchange; A third cooler, the third cooler comprising: a third heat absorbing channel and a third heat releasing channel for heat exchange; Among them, the third end of the switching device is respectively connected to the liquid inlet end of the first heat absorption channel, the liquid inlet end of the second heat absorption channel and the liquid inlet end of the third heat absorption channel, and the fourth end of the switching device is respectively connected to the liquid outlet end of the first heat absorption channel, the liquid outlet end of the second heat absorption channel and the liquid outlet end of the third heat absorption channel.

10. An oil-immersed transformer, characterized in that: include: A cooling system for preventing and controlling clogging disasters caused by freshwater shellfish as described in any one of claims 1 to 9.

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