CN220039237U

CN220039237U - Charge air cooler

Info

Publication number: CN220039237U
Application number: CN202321178916.7U
Authority: CN
Inventors: 单世佳; 米海滨
Original assignee: Shaanxi Haitong Chemical Machinery Co ltd
Current assignee: Shaanxi Haitong Chemical Machinery Co ltd
Priority date: 2023-05-16
Filing date: 2023-05-16
Publication date: 2023-11-17
Anticipated expiration: 2033-05-16

Abstract

The utility model discloses a charge air cooler, which relates to the technical field of cooler devices and comprises a cooling block, wherein the inside of the cooling block is hollow, one side of the cooling block is fixedly provided with a liquid inlet pipe, the other side of the cooling block is fixedly provided with a liquid outlet pipe, both sides of the cooling block are fixedly provided with supporting blocks, the front surface and the back surface of the cooling block are respectively provided with two supporting holes, and the inner walls of every two corresponding supporting holes are fixedly provided with heat exchange pipes; the beneficial effects of the utility model are as follows: the dust screen filters the air that lets in the heat exchange tube, removes wherein dust, avoids the dust to adhere at the inner wall of heat exchange tube after getting into the inside of cooling block, is favorable to heat exchange tube and air to exchange heat, and servo motor passes through transfer line, worm wheel, worm and drive the brush layer and rotates, and the brush layer clears up the dust screen, promotes the dust that the dust screen intercepted to drop.

Description

Charge air cooler

Technical Field

The utility model relates to a cooler, in particular to a charge air cooler, and belongs to the technical field of cooler devices.

Background

Turbocharged and supercharged engines may be configured with compressed ambient air to increase power, and because compressing the air increases the temperature of the air, a charge air cooler is required to cool the heated air. The booster air cooler is mainly characterized in that high-temperature air is replaced to a required temperature range through fluid in a heat exchanger core, cold fluid and hot fluid are separated and are not contacted with each other, and heat is transferred to cold fluid through fins and copper heat exchange tubes by hot fluid.

The utility model provides a "charge air cooler" that "CN201620964762.8" disclosed wherein, its "includes curb plate, tube sheet, and both sides board and two tube sheets enclose into the cuboid space, the both sides of tube sheet are equipped with foundry goods pipe side head, be equipped with the heat exchange core in the cuboid space, the heat exchange core includes fin, heat exchange tube, baffling board, the baffling board is located between two heat exchange tubes, the fin is located the both ends of heat exchange tube, the fin with the heat exchange tube is hugged closely and is bloated together. The expansion fin type core body is adopted to effectively ensure the heat exchange quality of a product, the expansion fin type core body replaces an inherent brazing type tubular heat exchange core body, the expansion fin type heat exchange core body has the advantages of being compact in size, smaller in product, quick in heat exchange, light in weight, convenient to install, high in quality, durable, high in cost performance and the like, through further searching, the expansion fin type core body is disclosed as a pressurized air cooler device, the expansion fin type heat exchange core body comprises a cooling block, two air passages are arranged in the cooling block, cooling pipes corresponding to the cooling blocks are arranged in the cooling blocks on the front side and the rear side of a baffle ring, two ends of the cooling pipes extend into a sealing cavity formed by a sealing cover and the cooling block, connecting pipes for communicating the two cooling pipes are arranged in the cooling blocks on the left side and the right side of the baffle ring, two ends of a transverse heat conducting rod penetrate into the cooling block to be in contact with the outer edges of the connecting pipes, two ends of the longitudinal heat conducting rod penetrate into the cooling block to be in contact with the outer edges of the cooling pipes, and a liquid inlet pipe and a liquid outlet pipe are arranged on the sealing cover on the left side of the right side of the cooling block. According to the utility model, the air passage is arranged in the cooling block, so that the compressed air is safer when cooled, the phenomenon of pipe explosion caused by overhigh air pressure is prevented, and the heat conduction between the high-temperature air in the air passage and the cooling pipe and the connecting pipe is quickened by arranging the heat conducting rod, so that the cooling rate is quickened.

The charge air cooler described above, however, has the following drawbacks: the gas inside the air flue cannot be dedusted, and the cooling effect of the cooling block on the gas can be reduced due to the fact that dust adheres to the inner wall of the air flue.

Disclosure of Invention

The utility model aims to provide a charge air cooler, which solves the problems that the prior art cannot remove dust to the gas in an air passage, and dust is adhered to the inner wall of the air passage to reduce the cooling effect of a cooling block to the gas.

In order to achieve the above purpose, the present utility model provides the following technical solutions: the utility model provides a charge air cooler, includes the cooling block, the inside of cooling block sets up to the cavity, one side of cooling block is fixed and is equipped with the feed liquor pipe, the opposite side of cooling block is fixed and is equipped with the fluid-discharge tube, the both sides of cooling block are all fixed and are equipped with the supporting shoe, two supporting holes have all been seted up to the front and the back of cooling block, every two are corresponding the inner wall of supporting hole is all fixed and is equipped with the heat exchange tube, two the inner wall of heat exchange tube is all fixed and is equipped with dust screen, first dog and second dog, two the inside of heat exchange tube all is equipped with clean subassembly.

Preferably, two clean subassembly all includes servo motor and auxiliary assembly, two servo motor all fixes the top that sets up at the cooling block, two servo motor's transmission shaft is all fixed and is equipped with the transfer line, two the inside of two heat transfer tubes is arranged in respectively to the one end of transfer line, two the one end of transfer line is all fixed and is equipped with the worm wheel, two one side of worm wheel is all engaged and is connected with the worm, two the one end of worm is all fixed and is equipped with the drive plate, two the back of drive plate is all fixed and is equipped with two brush layers.

Preferably, the contact parts of the two transmission rods and the two heat exchange tubes are rotationally connected through the sealing bearings, the contact parts of the two worms and the two dustproof nets are rotationally connected through the sealing bearings, the back surfaces of the two hairbrush layers are slidingly connected with the front surface of one dustproof net, and the back surfaces of the other two hairbrush layers are slidingly connected with the front surface of the other dustproof net.

Preferably, the two auxiliary assemblies comprise connecting rods, the two connecting rods are respectively and fixedly arranged on the inner walls of the two heat exchange tubes, the two auxiliary cylinders are respectively and fixedly arranged at one ends of the connecting rods, the two inner walls of the auxiliary cylinders are respectively and rotatably connected with the surfaces of the two worms through sealing bearings, and the two temperature sensors are respectively and fixedly arranged at one ends of the auxiliary cylinders.

Preferably, the surface of two heat exchange tubes is all fixed and is equipped with the heat transfer ring, two the inside of heat transfer ring all sets up to the cavity, two the equal fixed connection of contact part of heat transfer ring and cooling block, two fixedly between the heat transfer ring be equipped with communicating pipe, one of them the surface of heat transfer ring and the one end fixed connection of feed liquor pipe, one of them the inside of heat transfer ring is linked together with the inside of feed liquor pipe, another the surface of heat transfer ring and the one end fixed connection of fluid-discharge tube, another the inside of heat transfer ring is linked together with the inside of fluid-discharge tube.

Preferably, the surfaces of the two heat exchange pipes are respectively fixedly provided with a water flushing pipe and a sewage discharge pipe, the surfaces of the two water flushing pipes are respectively fixedly provided with a first electric valve, and the surfaces of the two sewage discharge pipes are respectively fixedly provided with a second electric valve.

Preferably, two first spout has all been seted up on the surface of supporting shoe, two the screw hole has all been seted up to the front and the back of supporting shoe, two the equal sliding connection in surface of supporting shoe has the support box, two the second spout has all been seted up on the surface of support box, one of them the inner wall of second spout and the surface sliding connection of feed liquor pipe, another the inner wall of second spout and the surface sliding connection of fluid-discharge tube, two the through-hole that a plurality of interval is equal has all been seted up to the front and the back of support box, one of them the top of supporting shoe is fixed respectively and is equipped with flush mounting plate and current collection box, the inside of current collection box is fixed respectively and is equipped with singlechip and wireless transmission module, and two temperature sensor and wireless transmission module are all connected with the monolithic is electromechanical, two the one side of support box is all fixed and is equipped with two mounting panels, four the mounting hole has all been seted up on the surface of mounting panel.

Preferably, the surface of the switch panel is respectively provided with a servo motor switch, a singlechip switch, a first electric valve switch and a second electric valve switch, and the two servo motors, the singlechip, the two first electric valves and the two second electric valves are respectively electrically connected with an external power supply through the servo motor switch, the singlechip switch, the first electric valve switch and the second electric valve switch.

Compared with the related art, the charge air cooler provided by the utility model has the following beneficial effects:

1. the dustproof net filters the air introduced into the heat exchange tube to remove dust, so that the dust is prevented from adhering to the inner wall of the heat exchange tube after entering the cooling block, the heat exchange between the heat exchange tube and the air is facilitated, the servo motor drives the brush layer to rotate through the transmission rod, the worm wheel, the worm and the transmission plate, the brush layer cleans the dustproof net, the dust intercepted by the dustproof net is promoted to fall, and the air permeability of the dustproof net is ensured;

2. the proper amount of clear water is added through the flushing pipe, the clear water can be blocked by the first stop block and the second stop block, the clear water is prevented from flowing into the outer supercharged engine along the heat exchange pipe, the clear water contacts with the dust which is swept down to form sewage, and the sewage is discharged, so that the dust in the heat exchange pipe is removed, and the heat exchange pipe is not required to be disassembled.

Drawings

FIG. 1 is a schematic diagram of the structure of the present utility model;

FIG. 2 is a schematic cross-sectional view of the present utility model;

FIG. 3 is a schematic side sectional view of the present utility model;

FIG. 4 is an enlarged schematic view of the structure of FIG. 3A according to the present utility model;

FIG. 5 is a schematic view of a cleaning assembly according to the present utility model.

In the figure: 1. a cooling block; 2. a liquid inlet pipe; 3. a liquid discharge pipe; 4. a support block; 5. a support hole; 6. a heat exchange tube; 7. a cleaning assembly; 71. a servo motor; 72. a transmission rod; 73. a worm wheel; 74. a worm; 75. a drive plate; 76. a brush layer; 8. an auxiliary component; 81. a connecting rod; 82. an auxiliary cylinder; 83. a temperature sensor; 9. a dust screen; 10. a heat exchange ring; 11. a first stopper; 12. a second stopper; 13. a communicating pipe; 14. a water flushing pipe; 15. a blow-down pipe; 16. a support box; 17. a first chute; 18. a second chute; 19. a switch panel; 20. a current collecting box; 21. and (3) mounting a plate.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

Example 1:

referring to fig. 1-5, the utility model provides a charge air cooler, which comprises a cooling block 1, wherein the inside of the cooling block 1 is hollow, one side of the cooling block 1 is fixedly provided with a liquid inlet pipe 2, the other side of the cooling block 1 is fixedly provided with a liquid outlet pipe 3, both sides of the cooling block 1 are fixedly provided with supporting blocks 4, the front and the back of the cooling block 1 are respectively provided with two supporting holes 5, the inner walls of each two corresponding supporting holes 5 are respectively fixedly provided with a heat exchange pipe 6, the inner walls of the two heat exchange pipes 6 are respectively fixedly provided with a dust screen 9, a first stop block 11 and a second stop block 12, and the inside of each two heat exchange pipes 6 is respectively provided with a cleaning component 7;

the surface of each heat exchange tube 6 is fixedly provided with a heat exchange ring 10, the interiors of the two heat exchange rings 10 are hollow, the contact parts of the two heat exchange rings 10 and the cooling block 1 are fixedly connected, a communicating pipe 13 is fixedly arranged between the two heat exchange rings 10, the surface of one heat exchange ring 10 is fixedly connected with one end of the liquid inlet tube 2, the interior of one heat exchange ring 10 is communicated with the interior of the liquid inlet tube 2, the surface of the other heat exchange ring 10 is fixedly connected with one end of the liquid outlet tube 3, the interior of the other heat exchange ring 10 is communicated with the interior of the liquid outlet tube 3, cooling liquid enters the interior of one heat exchange ring 10 through the liquid inlet tube 2, air in one heat exchange tube 6 is cooled, then enters the interior of the other heat exchange ring 10 through the communicating pipe 13, air in the other heat exchange tube 6 is cooled, and finally the cooling liquid is discharged from the liquid outlet tube 3;

the surfaces of the two heat exchange pipes 6 are fixedly provided with a water flushing pipe 14 and a sewage draining pipe 15 respectively, the surfaces of the two water flushing pipes 14 are fixedly provided with a first electric valve, the surfaces of the two sewage draining pipes 15 are fixedly provided with a second electric valve, the first electric valve is opened, a proper amount of clear water is added through the water flushing pipe 14, the clear water contacts with the swept dust to form sewage, the second electric valve is opened, and the sewage is discharged, so that the dust in the heat exchange pipes 6 is removed, the heat exchange pipes 6 do not need to be disassembled, and the sewage draining device is more convenient;

the surfaces of the two supporting blocks 4 are provided with first sliding grooves 17, the front surfaces and the back surfaces of the two supporting blocks 4 are provided with threaded holes, the surfaces of the two supporting blocks 4 are connected with supporting boxes 16 in a sliding manner, the surfaces of the two supporting boxes 16 are provided with second sliding grooves 18, the inner wall of one second sliding groove 18 is connected with the surface of the liquid inlet pipe 2 in a sliding manner, the inner wall of the other second sliding groove 18 is connected with the surface of the liquid outlet pipe 3 in a sliding manner, the front surfaces and the back surfaces of the two supporting boxes 16 are provided with a plurality of through holes with equal intervals, the top ends of one supporting block 4 are respectively fixedly provided with a switch panel 19 and a current collecting box 20, the inside of the current collecting box 20 is respectively fixedly provided with a singlechip and a wireless transmission module, the two temperature sensors 83 and the wireless transmission modules are electrically connected with the single chip microcomputer, two mounting plates 21 are fixedly arranged on one sides of the two supporting boxes 16, mounting holes are formed in the surfaces of the four mounting plates 21, bolts are screwed in through the mounting holes, so that the mounting plates 21 and the supporting boxes 16 are fixed at a target place, the bolts are screwed in the threaded holes through the through holes, the supporting boxes 16 and the supporting blocks 4 are fixed, the cooling blocks 1 are fixed, if different through holes are selected to be aligned with the threaded holes, and the bolts are screwed in to fix the supporting boxes 16 and the supporting blocks 4, the height of the cooling blocks 1 is changed, and the cooling blocks are more flexible;

the surface of the switch panel 19 is respectively provided with a singlechip switch, a first electric valve switch and a second electric valve switch, and the singlechip, the two first electric valves and the two second electric valves are respectively electrically connected with an external power supply through the singlechip switch, the first electric valve switch and the second electric valve switch;

referring to fig. 1-5, the present utility model provides a charge air cooler further comprising two cleaning assemblies 7, wherein the two cleaning assemblies 7 each comprise a servo motor 71 and an auxiliary assembly 8, the two servo motors 71 are fixedly arranged at the top ends of the cooling block 1, transmission shafts of the two servo motors 71 are fixedly provided with transmission rods 72, one ends of the two transmission rods 72 are respectively arranged in the two heat exchange tubes 6, one ends of the two transmission rods 72 are fixedly provided with worm gears 73, one sides of the two worm gears 73 are respectively connected with a worm 74 in a meshed manner, one ends of the two worm gears 74 are fixedly provided with transmission plates 75, and the back surfaces of the two transmission plates 75 are fixedly provided with two brush layers 76;

the contact parts of the two transmission rods 72 and the two heat exchange tubes 6 are rotationally connected through sealing bearings, the contact parts of the two worms 74 and the two dustproof nets 9 are rotationally connected through sealing bearings, wherein the back surfaces of the two hairbrush layers 76 are slidingly connected with the front surface of one dustproof net 9, and the back surfaces of the other two hairbrush layers 76 are slidingly connected with the front surface of the other dustproof net 9;

the surface of the switch panel 19 is provided with a servo motor switch, and the servo motor 71 is electrically connected with an external power supply through the servo motor switch;

specifically, as shown in fig. 1, 3, 4 and 5, the servo motor 71 is started firstly, the servo motor 71 drives the transmission rod 72 to rotate, the transmission rod 72 drives the worm wheel 73 to rotate, the worm wheel 73 drives the worm 74 to rotate, the worm 74 drives the transmission plate 75 to rotate, the transmission plate 75 drives the brush layer 76 to rotate, the brush layer 76 cleans the dust screen 9, dust intercepted by the dust screen 9 is caused to fall, and ventilation property of the dust screen 9 is guaranteed.

Example 2:

the two auxiliary assemblies 8 comprise connecting rods 81, the two connecting rods 81 are respectively and fixedly arranged on the inner walls of the two heat exchange tubes 6, one ends of the two connecting rods 81 are respectively and fixedly provided with auxiliary cylinders 82, the inner walls of the two auxiliary cylinders 82 are respectively and rotatably connected with the surfaces of the two worms 74 through sealing bearings, and one ends of the two auxiliary cylinders 82 are respectively and fixedly provided with temperature sensors 83;

specifically, as shown in fig. 1, 3, 4 and 5, the connecting rod 81 limits the worm 74 through the auxiliary cylinder 82, which is favorable for improving the stability of the worm 74 during rotation, and the temperature sensor 83 can measure the temperature inside the heat exchange tube 6 and transmit the temperature to the singlechip, and the singlechip sends temperature data to a remote intelligent end through the wireless transmission module, so that the temperature inside the heat exchange tube 6 can be conveniently mastered.

Working principle: when the utility model is particularly used, compressed and warmed ambient air is firstly introduced through the two heat exchange pipes 6, cooling liquid enters the inside of one heat exchange ring 10 through the liquid inlet pipe 2 to cool the air in the inside of one heat exchange pipe 6, then enters the inside of the other heat exchange ring 10 through the communicating pipe 13 to cool the air in the inside of the other heat exchange pipe 6, finally is discharged from the liquid discharge pipe 3, the dust screen 9 filters the air introduced into the heat exchange pipe 6 to remove dust, the dust is prevented from adhering to the inner wall of the heat exchange pipe 6 after entering the inside of the cooling block 1, the heat exchange between the heat exchange pipe 6 and the air is facilitated, when the dust screen 9 needs to be cleaned, the servo motor 71 is started, the servo motor 71 drives the transmission rod 72 to rotate, the transmission rod 72 drives the worm wheel 73 to rotate, the worm wheel 73 can drive the worm 74 to rotate, the worm 74 can drive the transmission plate 75 to rotate, the transmission plate 75 drives the brush layer 76 to rotate, the brush layer 76 cleans the dust screen 9, dust intercepted by the dust screen 9 is caused to fall, ventilation property of the dust screen 9 is guaranteed, the servo motor 71 is closed after cleaning, a proper amount of clean water is added through the water pipe 14, the clean water can be blocked by the first stop block 11 and the second stop block 12, the clean water is prevented from flowing into the external supercharged engine along the heat exchange pipe 6, the clean water contacts with the scanned dust to form sewage, the second electric valve is opened, the sewage is discharged, thereby removing dust in the heat exchange pipe 6, the heat exchange pipe 6 is not required to be disassembled, more convenient and supplementary explanation is required to be needed, the bolts are screwed through the mounting plate 21 and the support box 16 are fixed at a target place, the bolts are screwed into the threaded holes through the through holes, thereby accomplish the fixed of support box 16 and supporting shoe 4, and then fix cooling block 1, if select different through-holes to align with the screw hole to screw in bolt fixed support box 16 and supporting shoe 4, then changed the height of cooling block 1, it is more nimble.

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

Claims

1. The utility model provides a charge air cooler, includes cooling block (1), its characterized in that, the inside of cooling block (1) sets up to the cavity, one side of cooling block (1) is fixed and is equipped with feed liquor pipe (2), the opposite side of cooling block (1) is fixed and is equipped with fluid-discharge tube (3), the both sides of cooling block (1) are all fixed and are equipped with supporting shoe (4), two supporting holes (5) have all been seted up on the front and the back of cooling block (1), every two corresponding the inner wall of supporting hole (5) is all fixed and is equipped with heat exchange tube (6), two the inner wall of heat exchange tube (6) is all fixed and is equipped with dust screen (9), first dog (11) and second dog (12), two the inside of heat exchange tube (6) all is equipped with clean subassembly (7).

2. A charge air cooler as set forth in claim 1 wherein: the cleaning assembly comprises a cleaning assembly (7) and a cooling assembly (1), wherein the cleaning assembly comprises a servo motor (71) and an auxiliary assembly (8), the servo motor (71) is fixedly arranged at the top end of the cooling block (1), a transmission shaft of the servo motor (71) is fixedly provided with a transmission rod (72), one end of the transmission rod (72) is respectively arranged in two heat exchange tubes (6), one end of the transmission rod (72) is fixedly provided with a worm wheel (73), one side of the worm wheel (73) is fixedly connected with a worm (74), one end of the worm (74) is fixedly provided with a transmission plate (75), and the back of the transmission plate (75) is fixedly provided with two brush layers (76).

3. A charge air cooler as set forth in claim 2 wherein: the contact parts of the two transmission rods (72) and the two heat exchange tubes (6) are rotationally connected through sealing bearings, the contact parts of the two worms (74) and the two dustproof nets (9) are rotationally connected through sealing bearings, the back surfaces of the two hairbrush layers (76) are slidably connected with the front surface of one dustproof net (9), and the back surfaces of the other two hairbrush layers (76) are slidably connected with the front surface of the other dustproof net (9).

4. A charge air cooler as set forth in claim 2 wherein: the two auxiliary assemblies (8) comprise connecting rods (81), the two connecting rods (81) are respectively and fixedly arranged on the inner walls of the two heat exchange tubes (6), one ends of the two connecting rods (81) are respectively and fixedly provided with auxiliary cylinders (82), the inner walls of the two auxiliary cylinders (82) are respectively and rotatably connected with the surfaces of the two worms (74) through sealing bearings, and one ends of the two auxiliary cylinders (82) are respectively and fixedly provided with temperature sensors (83).

5. A charge air cooler as set forth in claim 1 wherein: two the surface of heat exchange tube (6) is all fixed be equipped with heat exchange ring (10), two the inside of heat exchange ring (10) all sets up to the cavity, two the equal fixed connection of contact part of heat exchange ring (10) and cooling block (1), two fixed be equipped with communicating pipe (13) between heat exchange ring (10), one of them the surface of heat exchange ring (10) is linked together with the one end fixed connection of feed liquor pipe (2) the inside of one of them heat exchange ring (10) is linked together with the inside of feed liquor pipe (2), another the surface of heat exchange ring (10) is linked together with the one end fixed connection of fluid-discharge tube (3), another the inside of heat exchange ring (10) is linked together with the inside of fluid-discharge tube (3).

6. A charge air cooler as set forth in claim 4 wherein: the surfaces of the two heat exchange pipes (6) are respectively fixedly provided with a flushing pipe (14) and a sewage discharge pipe (15), the surfaces of the two flushing pipes (14) are respectively fixedly provided with a first electric valve, and the surfaces of the two sewage discharge pipes (15) are respectively fixedly provided with a second electric valve.

7. A charge air cooler as set forth in claim 6 wherein: the two the first spout (17) has all been seted up on the surface of supporting shoe (4), two the screw hole that a plurality of interval is equal has all been seted up to the front and the back of supporting shoe (4), two the equal sliding connection in surface of supporting shoe (4) has support box (16), two the second spout (18) has all been seted up on the surface of supporting box (16), one of them the inner wall of second spout (18) and the surface sliding connection of feed liquor pipe (2), another the inner wall of second spout (18) and the surface sliding connection of fluid-discharge tube (3), two the through-hole that a plurality of interval is equal has all been seted up to the front and the back of supporting box (16), one of them the top of supporting shoe (4) is fixed respectively and is equipped with flush mounting panel (19) and current collection box (20), the inside of current collection box (20) is fixed respectively and is equipped with singlechip and wireless transmission module, and two temperature sensor (83) and wireless transmission module all are connected with the monolithic is electromechanical nature, two one side of supporting box (16) is all fixed and is equipped with two mounting panel (21) are all seted up four mounting panel (21) surface mounting hole.

8. A charge air cooler as set forth in claim 7 wherein: the surface of the switch panel (19) is respectively provided with a servo motor switch, a singlechip switch, a first electric valve switch and a second electric valve switch, and the two servo motors (71), the singlechip, the two first electric valves and the two second electric valves are respectively electrically connected with an external power supply through the servo motor switch, the singlechip switch, the first electric valve switch and the second electric valve switch.