A temperature protection device for a cleaning liquid

Abstract

The present invention relates to the field of aircraft engine cleaning, and specifically discloses a temperature protection device for a cleaning liquid, which includes a water tank, a liquid outlet located at the bottom of the water tank, a heating unit located inside the water tank, a temperature and pressure integrated sensor for measuring the temperature and pressure inside the water tank, a visual liquid level gauge for measuring the height of the cleaning liquid inside the water tank, and an electrical control system that can preset the maximum temperature and the minimum liquid level. The electrical control system is electrically connected to the heating unit, the temperature and pressure integrated sensor, and the visual liquid level gauge, and the electrical control system controls the heating unit to be powered on or off. When the electrical control system obtains a signal that the cleaning liquid reaches the preset maximum temperature or the preset minimum liquid level, the electrical control system controls the heating unit to be powered off. In this solution, when the liquid level height is lower than the minimum liquid level, the electrical control system receives the corresponding liquid level signal, and the electrical control system sends a signal to turn off the heating unit, stopping the heating of the cleaning liquid, avoiding the situation of dry burning, and reducing energy consumption.

Description

Technical Field

[0001] The present invention relates to the technical field of aircraft engine cleaning, and particularly relates to a temperature protection device for a cleaning liquid. Background Art

[0002] The engine of an aircraft is a very important component for the aircraft. The engine provides power for the aircraft and is also the most complex part on the aircraft. The engine is also a component that is vulnerable to intrusion by objects such as dust, ice, sand, ash, and even birds. The engine operates at high temperatures and usually vaporizes the intruded substances, but the remaining residues may adhere to the surroundings (such as grease or crystals). If these substances accumulate, they may cause damage to the engine. Therefore, when the aircraft has flown for a period of time, the engine must be cleaned and necessary maintenance must be carried out.

[0003] The most common engine cleaning method is to remove the engine from the aircraft and replace it with a cleaned and overhauled engine. In this way, the aircraft can not only clean the engine in time but also complete an overhaul of the engine; for some stubborn stains, special cleaning agents are generally used for cleaning. The cleaning agent is generally made of surfactants, emulsifiers, saponified substances, isolating agents, chelating agents, etc., and has a good cleaning effect on impurities such as grease and dust.

[0004] When in use, the cleaning agent is first mixed with water to form a cleaning liquid, and then the cleaning liquid is heated to activate the activity of the cleaning agent in the water to achieve the best cleaning effect; therefore, a heat preservation device is generally used to heat and keep warm the cleaning liquid. When the conventional heat preservation device is in use, the cleaning liquid will be quickly lost during the use process, and the amount of cleaning liquid stored in the heat preservation device will decrease accordingly. The heating module in the heat preservation device will continue to act, causing the temperature of the cleaning liquid to continue to rise, so that the temperature of the cleaning liquid exceeds the optimal cleaning temperature; when the cleaning liquid decreases, it is also easy to cause the heating module in the heat preservation device to continuously dry burn, affecting the service life of the heat preservation device and also increasing the energy consumption; at the same time, when heating the cleaning liquid, the heating module is located at a local part of the heat preservation device, and the stock of the cleaning liquid in the heat preservation device is huge, and it is easy to be unevenly heated, resulting in the inability of the local cleaning liquid to be heated to the corresponding temperature, affecting the cleaning efficiency of the cleaning liquid during cleaning. Summary of the Invention

[0005] Aiming at the deficiencies in the prior art, the present invention provides a temperature protection device for a cleaning liquid to solve the problems that the heating module in the heat preservation device is prone to continuous dry burning, affecting the service life of the heat preservation device and significantly increasing the energy consumption.

[0006] To achieve the above object, the basic scheme of the present invention is as follows: A temperature protection device for a cleaning liquid, including a water tank and a liquid outlet located at the bottom of the water tank, further including:

[0007] A heating unit is located in the water tank, and the heating unit is located at the bottom of the water tank;

[0008] A temperature and pressure integrated sensor for measuring the temperature and pressure in the water tank, the temperature and pressure integrated sensor is vertically fixed in the water tank, and the lowest end of the temperature and pressure integrated sensor is lower than the heating unit;

[0009] A visual level gauge for measuring the height of the cleaning fluid in the water tank, which is vertically fixed outside the water tank;

[0010] An electrical control system that can preset a maximum temperature and a minimum liquid level. The electrical control system is connected to the heating unit, the temperature-pressure integrated sensor and the visual liquid level gauge by electrical signals, and the electrical control system controls the heating unit to be powered on or off. When the electrical control system obtains a signal that the cleaning fluid has reached a preset maximum temperature or a preset minimum liquid level, the electrical control system controls the heating unit to be powered off.

[0011] The technical principle and effect of the present invention are as follows: the preset maximum temperature in the electrical control system is preset according to the maximum efficiency temperature required by the cleaning agent, and the minimum liquid level is also preset in the electrical control system; then the cleaning agent and water are poured into the water tank in proportion, and at this time, the temperature and pressure integrated sensor in the water tank measures the temperature of the cleaning liquid, and the temperature of the cleaning liquid is measured to be lower than the preset maximum temperature, and the liquid level is higher than the minimum liquid level; the electrical control system receives the corresponding temperature and liquid level signals, and performs data signal judgment, and the electrical control system sends a signal to turn on the heating unit, and the heating unit heats the cleaning liquid after it is started.

[0012] When the temperature measured by the integrated temperature and pressure sensor reaches the preset maximum temperature, the electrical control system receives the corresponding temperature signal, and sends a signal to turn off the heating unit; at this time, the cleaning fluid can be used, and the cleaning fluid flows out through the outlet for use; during this process, the visual liquid level gauge monitors the retention amount of cleaning fluid in the water tank in real time. When the liquid level is lower than the minimum liquid level, the electrical control system receives the corresponding liquid level signal, and sends a signal to turn off the heating unit, stopping the heating of the cleaning fluid to avoid dry burning and reduce energy consumption.

[0013] Furthermore, the heating unit includes a power supply, a plurality of electric heating tubes, a wiring block, a rotating ring, a sealing ring, a mounting shell and a rotating part for controlling the rotation of the rotating ring. The power supply, the rotating part, the rotating ring and the wiring block are all located in the mounting shell. The sealing ring is fixedly connected to the mounting shell. The sealing ring is fixedly installed on the water tank. The rotating ring is coaxially rotatingly sealed and installed on the sealing ring. One end of the rotating ring passes through the sealing ring and is rotatably connected to the wiring block. A connecting wire electrically connected to the power supply is pre-embedded in the wiring block. Both ends of the electric heating tube are fixedly passed through the rotating ring, and the two ends of the electric heating tube can be abutted against the ends of the connecting wire on the wiring block to be electrically connected to the power supply. The middle part of the electric heating tube is located in the water tank.

[0014] With the above settings, when the heating unit is in use, the rotating part can drive the rotating ring and the electric heating tube to rotate relative to the sealing ring. After the cleaning liquid is heated for a period of time, when controlling the rotating part to drive the electric heating tube, the rotating electric heating tube can stir the cleaning liquid in the water tank, so that the heated cleaning liquid can be mixed with the unheated cleaning liquid in a local area of the water tank, making the temperature of the cleaning liquid uniform; when the electric heating tube rotates and abuts against the connecting wire, it can be switched to the heating state of the electric heating tube for the cleaning liquid. The use of the electric heating tube can be switched according to the use requirements; when the electric heating tube is stirring, the residual heat on the electric heating tube can quickly exchange heat with the cleaning liquid, which can improve the heating efficiency of the cleaning liquid.

[0015] Further, the rotating part includes an intermittently starting motor, a rotating shaft fixedly connected to the power output end of the intermittently starting motor, a driving gear coaxially and fixedly installed on the rotating shaft, and a first switch for controlling the opening or closing of the intermittently starting motor. The rotating ring is a rotating gear, and the driving gear meshes with the rotating gear; the first switch is electrically connected to the electrical control system, and one end of the rotating gear close to the wiring block is rotatably connected to the wiring block.

[0016] With the above settings, the intermittently starting motor can control the rotation timing of the driving gear and the rotating gear and the electrical connection timing of the electric heating tube and the connecting wire, so that the stirring and heating functions of the electric heating tube can be quickly switched; since the first switch is electrically connected to the electrical control system, the opening and closing timing and the switch time length of the motor can be controlled by presetting the electrical control system, making the function switching more convenient and reliable.

[0017] Further, a stirring blade is detachably installed in the middle of the water tank where the electric heating tube is located.

[0018] With the above settings, when the electric heating tube rotates driven by the rotating gear, the stirring blade can rotate synchronously, which can expand the stirring range of the electric heating tube and improve the efficiency of stirring the temperature of the cleaning liquid evenly.

[0019] Further, a first conductive column is electrically connected to the end of the electric heating tube. The first conductive column is fixedly installed in the rotating ring. At one end of the wiring block close to the rotating ring, there are a number of second conductive columns that can abut against the end of the first conductive column. A sliding hole for the second conductive column to move along the axis of the rotating ring is provided in the wiring block. An electromagnet is provided at the bottom of the sliding hole. A magnet that repels the electromagnet is fixedly provided at one end of the second conductive column close to the electromagnet. A tension spring is arranged axially in the sliding hole. One end of the tension spring is fixedly connected to one end of the second conductive column close to the electromagnet, and the other end of the tension spring is fixedly connected to the bottom of the sliding hole of the wiring block; a groove for the end of the second conductive column to be embedded is provided at the position of the first conductive column of the rotating ring; a conductive sheet electrically connected to the connecting wire is provided on the side wall of the second conductive column. When the end of the second conductive column is embedded in the groove and abuts against the first conductive column, and the electromagnet is energized, the conductive sheet fits against the end of the connecting wire.

[0020] With the above settings, when the first conductive column and the second conductive column are opposite to each other, the motor pauses. At this time, the electromagnet is energized to generate a repulsive force that repels the magnet, thereby pushing and pressing the second conductive column and the magnet into the groove, and the tension spring is stretched and stores energy; the end of the first conductive column abuts against the end of the second conductive column. At this time, the conductive sheet fits against the end of the connecting wire, realizing the power-on of the electric heating tube; when the electric heating tube needs to rotate and stir, the electromagnet is powered off, and the tension spring pulls the second conductive column back into the sliding hole, and the second conductive column is powered off from the end of the connecting wire. At this time, the second conductive column no longer blocks the groove, and the rotation of the first conductive column and the rotating ring is convenient; the whole process makes the electrical connection between the first conductive column, the second conductive column and the connecting wire more reliable, and at the same time, it is also convenient that the first conductive column and the second conductive column do not interfere with each other when switching the rotation of the electric heating tube.

[0021] Further, insulating layers are wrapped on the side walls of both the second conductive column and the first conductive column.

[0022] With the above settings, the insulating layer can ensure the accurate and safe transmission of electric energy between the second conductive column and the first conductive column.

[0023] Further, one end of the first conductive column close to the second conductive column is a first inclined surface, and one end of the second conductive column close to the first conductive column is a second inclined surface that can fit against the first inclined surface.

[0024] With the above settings, when the first conductive column and the second conductive column abut against each other, the settings of the first inclined surface and the second inclined surface can make the electrical connection between the first conductive column and the second conductive column fit tightly.

[0025] Further, an installation ring is coaxially and fixedly installed at one end of the rotating ring away from the connection block. The installation ring and the sealing ring are coaxially sleeved. The two ends of the installation ring are attached to the two ends of the sealing ring. An annular installation cavity is provided between the installation ring and the sealing ring, and a packing is densely installed in the installation cavity; annular sealing rings that fit the installation ring and the sealing ring are provided on both sides of the packing.

[0026] Through the above settings, the packing and the annular sealing ring can perform sliding sealing between the rotating ring and the sealing ring, preventing the cleaning liquid from entering between the rotating gear and the connection block through the installation cavity.

[0027] Further, it further includes a second switch for controlling whether the connecting wire and the electromagnet are energized, and the second switch is electrically connected to the electrical control system.

[0028] Through the above settings, the timing of the disconnection and connection of the second switch can be controlled by presetting commands in the electrical control system, and then it can cooperate with the timing of the disconnection and connection of the first switch to achieve the effect of switching the functions of the electric heating tube.

[0029] Further, the bottom of the water tank is in a concave inclined shape, the liquid outlet is located at the lowest point of the bottom of the water tank, and a filter plate is detachably installed covering the liquid outlet of the water tank.

[0030] Through the above settings, the bottom of the water tank can guide the cleaning liquid, enabling the cleaning liquid in the water tank to be completely discharged for use; at the same time, before use, the filter plate can filter the cleaning liquid to prevent large particle impurities from being contained in the cleaning liquid and causing damage to the aircraft engine during the cleaning process. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic structural diagram in the axonometric direction of a temperature protection device for a cleaning liquid in an embodiment of the present invention.

[0032] Figure 2 It is a top view of a temperature protection device for a cleaning liquid in an embodiment of the present invention.

[0033] Figure 3 is Figure 2 a cross-sectional view taken along line A-A in

[0034] Figure 4 is Figure 3 an enlarged partial cross-sectional view of the heating unit in

[0035] In the above-mentioned drawings: water tank 10, liquid outlet 101, temperature and pressure integrated sensor 102, visible liquid level gauge 103, filter plate 104, electric heating tube 20, stirring blade 201, wiring block 30, connecting wire 301, sliding hole 302, electromagnet 303, tension spring 304, sealing ring 40, mounting shell 50, rotating gear 601, motor 602, rotating shaft 603, driving gear 604, first conductive column 701, second conductive column 702, insulating layer 703, magnet 704, conductive sheet 705, mounting ring 80, packing 801, annular sealing ring 802. Detailed implementation mode

[0036] The technical solutions in the present invention will be further described below in conjunction with the drawings and embodiments.

[0037] This embodiment is basically as Figure 1 , Figure 2 , Figure 3 and Figure 4 shown. An embodiment of the present invention provides a temperature protection device for cleaning liquid, including a water tank 10, a liquid outlet 101 located at the bottom of the water tank 10, a heating unit located inside the water tank 10, a temperature and pressure integrated sensor 102 for measuring the temperature and pressure inside the water tank 10, a visible liquid level gauge 103 for measuring the height of the cleaning liquid inside the water tank 10, and an electrical control system that can preset the maximum temperature and the minimum liquid level; the bottom of the water tank 10 is in a concave inclined shape, the liquid outlet 101 is located at the lowest position on the left side of the bottom of the water tank 10, a rectangular filter plate 104 is covered and horizontally buckled at the liquid outlet 101 of the water tank 10, and a number of filter holes are provided on the filter plate 104; wherein, the model of the temperature and pressure integrated sensor 102 is SUAY18 temperature and pressure integrated pressure sensor, the model of the visible liquid level gauge 103 is TALOSE-56 304 stainless steel glass tube liquid level gauge, and the electrical control system is a PLC controller.

[0038] As Figure 1 and Figure 3 shown, the heating unit is located at the lower right side of the water tank 10, the temperature and pressure integrated sensor 102 is vertically fixedly installed in the water tank 10 through a nut, the lowest end of the temperature and pressure integrated sensor 102 is lower than the heating unit, and the lowest end of the temperature and pressure integrated sensor 102 faces the filter plate 104; fixing blocks are welded on both the upper and lower ends of the visible liquid level gauge 103, the fixing blocks are both welded to the water tank 10, and the visible liquid level gauge 103 is vertically fixedly installed outside the water tank 10 through the fixing blocks.

[0039] As Figure 3 and Figure 4As shown in the figure, the heating unit includes a power supply (not shown), two electric heating tubes 20, a wiring block 30, a rotating ring, a sealing ring 40, a mounting shell 50, and a rotating part for controlling the rotation of the rotating ring. The power supply, the rotating part, the rotating ring, and the wiring block 30 are all located inside the mounting shell 50. The right side of the sealing ring 40 is fixed to the mounting shell 50 by bolts. The sealing ring 40 passes through the water tank 10 and its outer wall is welded to the water tank 10. Both of the two electric heating tubes 20 are in a "U" shape, and the two electric heating tubes 20 are arranged in a cross shape and overlap at the middle part. At the same time, the rotating ring is a rotating gear 601. The rotating part includes an intermittently starting motor 602, a rotating shaft 603 fixedly connected to the power output end of the intermittently starting motor 602, a driving gear 604 coaxially and fixedly installed on the rotating shaft 603, and a first switch for controlling the opening or closing of the intermittently starting motor 602. The driving gear 604 meshes with the rotating gear 601. The right end of the rotating gear 601 passes through the sealing ring 40 and is coaxially rotatably connected to the wiring block 30.

[0040] At the same time, as Figure 4 shown, a connecting wire 301 electrically connected to the power supply is embedded and installed in the wiring block 30. Both ends of the electric heating tube 20 fixedly pass through the mounting ring 80. The middle part of the electric heating tube 20 is located inside the water tank 10. A stirring blade 201 is detachably installed at the middle part of the electric heating tube 20 located inside the water tank 10. A first conductive column 701 is electrically connected to the end of the electric heating tube 20. The first conductive column 701 is fixedly installed inside the mounting ring 80. Four second conductive columns 702 that can abut against the end of the first conductive column 701 are provided at one end of the wiring block 30 close to the mounting ring 80. Insulating layers 703 are wrapped on the side walls of the second conductive columns 702 and the first conductive column 701. A sliding hole 302 for the second conductive column 702 to move along the horizontal axis of the rotating gear 601 is provided inside the wiring block 30. An electromagnet 303 is provided at the bottom of the sliding hole 302. A magnet 704 that repels the electromagnet 303 is fixedly arranged on the right end of the second conductive column 702. A tension spring 304 is arranged axially inside the sliding hole 302. The left end of the tension spring 304 is welded to the right end of the second conductive column 702, and the right end of the tension spring 304 is welded to the bottom of the sliding hole 302 of the wiring block 30. A groove for the end of the second conductive column 702 to be embedded is provided at the first conductive column 701 of the mounting ring 80. A conductive piece 705 electrically connected to the connecting wire 301 is provided on the side wall of the second conductive column 702. When the end of the second conductive column 702 is embedded in the groove and abuts against the first conductive column 701, and the electromagnet 303 is energized, the conductive piece 705 is in contact with the end of the connecting wire 301. As shown in the figure, the right end of the first conductive column 701 is a first inclined surface, and the left end of the second conductive column 702 is a second inclined surface that can fit with the first inclined surface. The inclination directions of the first inclined surface and the second inclined surface are the same as the rotation direction of the rotating gear 601. The right end surface of the rotating gear 601 can squeeze the second inclined surface of the second conductive column 702.

[0041] As shown Figure 4 In the figure, an installation ring 80 is coaxially welded to the left end of the rotating gear 601. The installation ring 80 and the sealing ring 40 are coaxially sleeved. The two ends of the installation ring 80 are in contact with the two ends of the sealing ring 40. An annular installation cavity is provided between the installation ring 80 and the sealing ring 40, and a packing 801 is densely installed in the installation cavity; annular sealing rings 802 that fit the installation ring 80 and the sealing ring 40 are provided on both sides of the packing 801.

[0042] In addition, it further includes a second switch for controlling whether the control connection wire 301 and the electromagnet 303 are powered on; at the same time, the electrical control system is electrically connected to the heating unit, the temperature and pressure integrated sensor 102, the first switch, the second switch, and the visual liquid level gauge 103, and the electrical control system controls the heating unit to be powered on or off. When the electrical control system obtains signals of the cleaning liquid reaching the preset maximum temperature or the preset minimum liquid level, the electrical control system controls the intermittently started motor 602 to power off through the first switch, and the electrical control system controls the intermittently started motor 602 to power off and controls the connection wire 301 and the electromagnet 303 to power off through the second switch.

[0043] When the temperature protection device for a cleaning liquid in this embodiment is in use, first set the preset maximum temperature in the electrical control system to 60 °C and the minimum liquid level to 10 cm; then pour the cleaning agent and water into the water tank 10 in proportion. At this time, the temperature and pressure integrated sensor 102 in the water tank 10 measures the temperature of the cleaning liquid, and it is measured that the temperature of the cleaning liquid is lower than 60 °C and the liquid level height is higher than 10 cm.

[0044] At this time, the electrical control system receives the corresponding temperature and liquid level height signals, and makes a data signal judgment. The electrical control system sends signals connected to the first switch and the second switch. After the first switch connects the circuit of the motor 602, the motor 602 starts and stops intermittently. The motor 602 drives the driving gear 604 to rotate, and the driving gear 604 synchronously drives the rotating gear 601 to rotate clockwise. The rotating gear 601 drives the first conductive column 701, the electric heating tube 20, and the installation ring 80 to rotate relative to the sealing ring 40. Furthermore, the first conductive column 701 continuously coincides and is misaligned with the second conductive column 702. When the first conductive column 701 and the second conductive column 702 are opposite to each other, the motor 602 pauses. At this time, the electromagnet 303 is powered on to generate a repulsive force that repels the magnet 704, thereby pushing and pressing the second conductive column 702 and the magnet 704 into the groove, and the tension spring 304 is stretched and stores energy; when the first inclined surface and the second inclined surface are in contact, the conductive sheet 705 also just contacts the end of the connection wire 301, realizing the power-on of the electric heating tube 20, and the electric heating tube 20 heats the cleaning liquid.

[0045] After the electric heating tube 20 is heated for 5 - 10 minutes, the motor 602 starts. When the rotating gear 601 rotates, it squeezes the second inclined surface of the second conductive column 702, and the tension spring 304 shortens, causing the second conductive column 702 to move back into the sliding hole 302. The rotating gear 601 continues to drive the first conductive column 701, the electric heating tube 20, and the mounting ring 80 to rotate relative to the sealing ring 40. The stirring blade 201 on the electric heating tube 20 stirs and mixes the cleaning liquid during the heating process, so that the heated cleaning liquid can be mixed with the unheated cleaning liquid in a local area of the water tank 10, making the temperature of the cleaning liquid uniform. After stirring for 1 - 2 minutes, the heating process of the cleaning liquid is repeated; repeating the above heating and stirring processes of the cleaning liquid makes the cleaning liquid heated evenly and quickly. When the stirring blade 201 stirs the cleaning liquid, the waste heat on the electric heating tube 20 can quickly exchange heat with the cleaning liquid, which can improve the heating efficiency of the cleaning liquid.

[0046] When the temperature measured by the temperature and pressure integrated sensor 102 reaches 60 °C or above, the electrical control system receives the corresponding temperature signal, and the electrical control system sends a signal to disconnect the first switch and the second switch, stopping both the stirring and heating of the cleaning liquid. At this time, the cleaning liquid can be used and flows out through the filter plate 104 and the liquid outlet 101. During this process, when it is found that the temperature of the cleaning liquid is lower than 60 °C by monitoring, the heating and stirring treatment of the heating unit can be automatically turned on to keep the temperature of the cleaning liquid at 60 °C, improving the efficiency of the cleaning liquid during cleaning. At the same time, the visible liquid level gauge 103 monitors the remaining amount of the cleaning liquid in the water tank 10 in real time. When the liquid level height is lower than or equal to 10 cm, the electrical control system receives the corresponding liquid level signal, and the electrical control system sends a signal to disconnect the first switch and the second switch, stopping both the stirring and heating of the cleaning liquid, avoiding dry burning and reducing energy consumption.

[0047] When the mounting ring 80 rotates relative to the sealing ring 40, the packing 801 and the annular sealing ring 802 between the mounting ring 80 and the sealing ring 40 can perform sliding sealing between the mounting ring 80 and the sealing ring 40, preventing the cleaning liquid from entering the rotating gear 601 and the wiring block 30 through the installation cavity. At the same time, when the first conductive column 701 and the second conductive column 702 are in contact and conduct electricity, the insulating layers 703 outside the first conductive column 701 and the second conductive column 702 can ensure the accurate and safe transmission of electric energy.

[0048] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not restrictive. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the purpose and scope of the technical solutions of the present invention, and they should all be covered by the scope of the claims of the present invention.

Claims

1. A temperature protection device for a cleaning liquid, comprising a water tank and a liquid outlet located at the bottom of the water tank, characterized in that, Also includes: A heating unit located in the water tank, wherein the heating unit is located at the bottom of the water tank; A temperature-pressure integrated sensor for measuring the temperature and pressure in the water tank, wherein the temperature-pressure integrated sensor is vertically fixed in the water tank, and the lowest end of the temperature-pressure integrated sensor is lower than the heating unit; A visual level gauge for measuring the height of the cleaning liquid in the water tank, wherein the visual level gauge is vertically fixedly installed outside the water tank; An electrical control system capable of presetting a maximum temperature and a minimum liquid level, wherein the electrical control system is connected to the heating unit, the temperature-pressure integrated sensor and the visual liquid level gauge by electrical signals, and the electrical control system controls the heating unit to be powered on or off. When the electrical control system obtains a signal that the cleaning liquid reaches a preset maximum temperature or a preset minimum liquid level, the electrical control system controls the heating unit to be powered off; The heating unit comprises a power supply, two electric heating tubes, a junction block, a rotating ring, a sealing ring, a mounting shell and a rotating part for controlling the rotation of the rotating ring. The power supply, the rotating part, the rotating ring and the junction block are all located in the mounting shell. The sealing ring is fixedly connected to the mounting shell. The sealing ring is fixedly installed on the water tank. The rotating ring is coaxially rotating and sealingly installed on the sealing ring. One end of the rotating ring passes through the sealing ring and is rotatably connected to the junction block. A connecting wire electrically connected to the power supply is pre-buried in the junction block. The two electric heating tubes are both "U"-shaped. Both ends of the electric heating tubes are fixedly passed through the rotating ring, and both ends of the electric heating tubes can be abutted against the ends of the connecting wires on the junction block to be electrically connected to the power supply. The middle part of the electric heating tube is located in the water tank. The rotating part includes an intermittently started motor, a rotating shaft fixedly connected to a power output end of the intermittently started motor, a driving gear coaxially fixedly mounted on the rotating shaft, and a first switch for controlling the intermittently started motor to be turned on or off, the rotating ring is a rotating gear, and the driving gear is meshed with the rotating gear; the first switch is electrically connected to the electrical control system, and one end of the rotating gear close to the wiring block is rotatably connected to the wiring block; The electric heating tube is located in the middle of the water tank and is detachably provided with a stirring sheet; The end of the electric heating tube is electrically connected with a first conductive column, which is fixedly installed in the rotating ring. A plurality of second conductive columns that can abut against the end of the first conductive column are provided at one end of the terminal block close to the rotating ring. A sliding hole for the second conductive column to move along the axis of the rotating ring is provided in the terminal block. An electromagnet is provided at the bottom of the sliding hole. A magnet that repels the electromagnet is fixedly provided on one end of the second conductive column close to the electromagnet. A tension spring is axially provided in the sliding hole. One end of the tension spring is fixedly connected to one end of the second conductive column close to the electromagnet, and the other end of the tension spring is fixedly connected to the bottom of the sliding hole of the terminal block. A groove for the end of the second conductive column to be embedded is provided at the first conductive column of the rotating ring. A conductive sheet electrically connected to the connecting wire is provided on the side wall of the second conductive column. When the end of the second conductive column is embedded in the groove and abuts against the first conductive column, and when the electromagnet is energized, the conductive sheet fits with the end of the connecting wire. One end of the first conductive column close to the second conductive column is a first inclined surface, and one end of the second conductive column close to the first conductive column is a second inclined surface that can be aligned with the first inclined surface; It further includes a second switch for controlling whether the connecting wire and the electromagnet are powered on, and the second switch is electrically connected to the electrical control system.

2. The temperature protection device for a cleaning liquid according to claim 1, wherein, Insulating layers are wrapped on the side walls of the second conductive column and the first conductive column.

3. The temperature protection device for a cleaning liquid according to claim 1, characterized in that, One end of the rotating ring away from the wiring block is coaxially and fixedly installed with an installation ring. The installation ring and the sealing ring are coaxially sleeved. The two ends of the installation ring are in contact with the two ends of the sealing ring. An annular installation cavity is provided between the installation ring and the sealing ring, and a filler is densely installed in the installation cavity; annular sealing rings that fit the installation ring and the sealing ring are provided on both sides of the filler.

4. A temperature protection device for a cleaning liquid as described in claim 1, characterized in that, The bottom of the water tank is in a concave inclined shape, the liquid outlet is located at the lowest point of the bottom of the water tank, and a filter plate is detachably installed and covered at the liquid outlet of the water tank.

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