CN218098323U

CN218098323U - Modular cold and hot impact device

Info

Publication number: CN218098323U
Application number: CN202220862782.XU
Authority: CN
Inventors: 林子杰; 黎观生; 周佳
Original assignee: Guangzhou Automobile Group Co Ltd
Current assignee: Guangzhou Automobile Group Co Ltd
Priority date: 2022-04-14
Filing date: 2022-04-14
Publication date: 2022-12-20
Anticipated expiration: 2032-04-14

Abstract

The utility model discloses a modular cold and hot impact device, which comprises a temperature control device and a switch valve group, wherein the temperature control device comprises a first temperature control device and a second temperature control device, the first end of the switch valve group is connected with the first temperature control device, the second end of the switch valve group is connected with the second temperature control device, and the third end of the switch valve group is connected with equipment to be tested; the switch valve group can enable the first temperature control device to be communicated with equipment to be tested to form a first circulation loop under a first working condition, and enable the second temperature control device to be communicated with the switch valve group to form a second circulation loop; the switch valve group can enable the second temperature control device to be communicated with the equipment to be tested to form a third circulation loop under the second working condition, and enables the first temperature control device to be communicated with the switch valve group to form a fourth circulation loop. The utility model provides a cold and hot impact device can compromise response speed and component life's problem.

Description

Modular cold and hot impact device

Technical Field

The utility model relates to a cold and hot impact test technical field, concretely relates to cold and hot impact device.

Background

The cooler is an important component of an automobile power assembly, and sometimes, cold and hot impact is required to be carried out on the cooler in an engine or transmission bench test so as to achieve the purposes of verifying the cold and hot impact resistance of parts or other purposes. In the existing cold and hot impact device, if the heat engine is turned off when the cold machine is used, the quick response is difficult when the heat engine is used, but if the heat engine is not turned off, the cooling liquid in the heat engine cannot circulate, so that the circulating pump is easy to damage after long-term use; in a similar way, if the heat engine is closed to be cold when in use, the heat engine is difficult to respond quickly when in use, but if the heat engine is not closed to be cold, the cooling liquid in the cold engine cannot circulate, and the circulating pump is easy to damage after long-term use.

SUMMERY OF THE UTILITY MODEL

In view of this, the utility model provides a modular cold and hot impact device realizes treating the cold and hot impact test of equipment of measureing through the combination of two temperature control device and ooff valve group, solves prior art and is difficult to compromise response speed and component life's problem.

The utility model provides a cold and hot impact device, including temperature control device and switch valves, temperature control device includes first temperature control device and second temperature control device, the first end of switch valves with first temperature control device is connected, the second end of switch valves with the second temperature control device is connected, the third end of switch valves is connected with the equipment to be measured; the switch valve bank can enable the first temperature control device to be communicated with the equipment to be tested to form a first circulation loop and enable the second temperature control device to be communicated with the switch valve bank to form a second circulation loop under a first working condition; and the switch valve group can enable the second temperature control device to be communicated with the equipment to be tested to form a third circulation loop under a second working condition, and enable the first temperature control device to be communicated with the switch valve group to form a fourth circulation loop.

Furthermore, the switch valve group comprises a first connecting pipeline and a switch valve which are arranged in the first integral frame, and the switch valve is connected through the first connecting pipeline; the switch valves comprise a first switch valve, a second switch valve, a third switch valve, a fourth switch valve, a fifth switch valve and a sixth switch valve; the first temperature control device is communicated with the first switch valve, the second switch valve and the equipment to be tested to form the first circulation loop, and the second temperature control device is communicated with the sixth switch valve to form the second circulation loop; the second temperature control device is communicated with the fourth switching valve, the fifth switching valve and the equipment to be tested to form a third circulation loop; the first temperature control device is communicated with the first switch valve to form the fourth circulation loop.

Further, first connecting pipeline includes first pipeline, second pipeline, third pipeline, fourth pipeline, fifth pipeline and sixth pipeline, first pipeline and second pipeline parallel arrangement, the third pipeline is connected perpendicularly between first pipeline and the second pipeline, fourth pipeline and fifth pipeline parallel arrangement, the sixth pipeline is connected perpendicularly the fourth pipeline with between the fifth pipeline, the fourth pipeline is close to the one end of the equipment to be tested with first tube coupling, the fifth pipeline is close to the one end of the equipment to be tested with the second tube coupling.

Further, the first switch valve, the second switch valve, the third switch valve, the fourth switch valve, the fifth switch valve and the sixth switch valve are respectively installed on the first pipeline, the second pipeline, the third pipeline, the fourth pipeline, the fifth pipeline and the sixth pipeline, the first switch valve, the second switch valve, the fourth switch valve and the fifth switch valve are in a normally closed state, and the third switch valve and the sixth switch valve are in a normally open state.

Furthermore, a first water inlet in the first temperature control device is connected with one end, far away from the equipment to be tested, of the second pipeline, and a first water outlet of the first temperature control device is connected with one end, far away from the equipment to be tested, of the first pipeline; a first water inlet of the second temperature control device is connected with one end, far away from the equipment to be tested, of the fifth pipeline, and a first water outlet of the second temperature control device is connected with one end, far away from the equipment to be tested, of the fourth pipeline; when the first temperature control device is connected with the equipment to be tested, the first switch valve and the second switch valve are opened, the third switch valve is closed, the fourth switch valve and the fifth switch valve are kept in a normally closed state, and the sixth switch valve is kept in a normally open state; when the second temperature control device is connected with the equipment to be tested, the fourth switch valve and the fifth switch valve are opened, the sixth switch valve is closed, the first switch valve and the second switch valve are kept in a normally closed state, and the third switch valve is kept in a normally open state.

Further, the switch valve group also comprises a first control system, and the first control system is in electric signal connection with the switch valve.

Furthermore, the first temperature control device and the second temperature control device comprise a circulating pump, a heat exchanger, a heater, a three-way proportional valve and an expansion water replenishing kettle which are arranged in the second integral frame, and the circulating pump, the heat exchanger, the heater, the three-way proportional valve and the expansion water replenishing kettle are connected with each other through a second connecting pipeline.

Furthermore, one end of the circulating pump is provided with a first water inlet, the other end of the circulating pump is divided into two paths, one path of the circulating pump is connected with one end of the heater, the other path of the circulating pump is connected with one end of the heat exchanger, the other ends of the heater and the heat exchanger are connected with one end of the three-way proportional valve, the other end of the three-way proportional valve is provided with a first water outlet, and the expansion water supplementing kettle is connected with the first water inlet.

Furthermore, a second water inlet and a second water outlet are arranged on the heat exchanger, and water in the heat exchanger flows into or out of the heat exchanger through the second water inlet and the second water outlet to cool the heat exchanger.

Furthermore, the first temperature control device and the second temperature control device both comprise second control systems, and the second control systems are in electric signal connection with the circulating pump, the heat exchanger, the heater, the three-way proportional valve and the expansion water replenishing kettle.

Compared with the prior art, the utility model discloses following profitable technological effect has:

the utility model provides a pair of cold and hot impact device, the cold and hot impact test of the equipment that awaits measuring is realized through the combination of two temperature control device and switch valves, two temperature control device functions are the same, can regard as cold machine or heat engine, can be when one of them cold and hot impact test of first temperature control device and second temperature control device, coolant liquid in the control another temperature control device makes second temperature control device also keep the running state through the return circuit circulation with the switch valves intercommunication, both can switch over first temperature control device and second temperature control device fast and carry out cold and hot impact test, the temperature control device that can also avoid not carrying out cold and hot impact test leads to the circulating pump impaired because the return circuit does not circulate.

Drawings

FIG. 1 is a schematic structural view of a thermal shock device according to the present invention;

FIG. 2 is a schematic view of a temperature control device of the thermal shock device of the present invention;

FIG. 3 is a schematic diagram of a switch valve set of the cold and hot impact device of the present invention;

fig. 4 is a structural diagram of the on-off valve of the cold and hot impact device of the present invention.

Wherein: 10-a temperature control device; 101-a first temperature control device; 102-a second temperature control device; 11-a second unitary frame; 12-a circulation pump; 13-a heat exchanger; 131-a second water inlet; 132-a second water outlet; 14-a heater; 15-three-way proportional valve; 16-expansion water replenishing kettle; 17-a second connecting line; 18 a-a first water inlet; 18 b-a first water outlet; 19-a second control system; 20-a switch valve group; 21-a first unitary frame; 22-a switch valve; 221-a first on-off valve; 222-a second on-off valve; 223-a third on/off valve; 224-a fourth switching valve; 225-fifth on-off valve; 226-sixth switching valve; 23-a first connecting line; 231-a first conduit; 232-a second conduit; 233-third pipeline; 234-fourth line; 235-a fifth conduit; 236-sixth conduit; 24-first control system.

Detailed Description

The following detailed description of the embodiments of the present invention is provided with reference to the accompanying drawings and examples. The following examples are intended to illustrate the invention, but are not intended to limit the scope of the invention.

In the description of the present invention, it should be noted that the directions or positional relationships indicated in the present description are based on the directions or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, and do not indicate or imply that the indicated device or element must have a specific direction, be constructed and operated in a specific direction, and thus, should not be construed as limiting the present invention.

Referring to fig. 1 to 4, the present invention provides a thermal shock device, which includes a temperature control device and a switch valve set, wherein the temperature control device 10 includes a first temperature control device 101 and a second temperature control device 102, a first end of the switch valve set 20 is connected to the first temperature control device 101, a second end of the switch valve set 20 is connected to the second temperature control device 102, and a third end of the switch valve set 20 is connected to a device to be tested; the switch valve group 20 can enable the first temperature control device 101 to be communicated with equipment to be tested to form a first circulation loop under a first working condition, and enable the second temperature control device 102 to be communicated with the switch valve group 20 to form a second circulation loop; the switch valve bank 20 can communicate the second temperature control device 102 with the device to be tested to form a third circulation loop under the second working condition, and communicate the first temperature control device 101 with the switch valve bank to form a fourth circulation loop.

The first working condition is one of a cold shock test or a thermal shock test, the first temperature control device 101 is communicated with the equipment to be tested through the switch valve group 20 to form a first circulation loop, and the cooling liquid in the first temperature control device 101 is adjusted to the required temperature and then flows into the equipment to be tested under the control of the switch valve group 20. At this time, the second thermostat 102 is still in an operating state, the second thermostat 102 is communicated with the valve block 20 to form a second circulation loop, and the cooling liquid in the second thermostat 102 can circulate in the second circulation loop. Similarly, the second working condition is the other one of the cold shock test and the thermal shock test, the second temperature control device 102 is communicated with the device to be tested through the switch valve group 20 to form a third circulation loop, and the cooling liquid in the second temperature control device 102 is adjusted to the required temperature and then flows into the device to be tested under the control of the switch valve group 20. At this time, the first temperature control device 101 is still in an operating state, the first temperature control device 101 is communicated with the valve group 20 to form a fourth circulation loop, and the cooling liquid in the first temperature control device 101 can circulate in the fourth circulation loop.

The utility model provides a cold and hot impact device can be when one of them carries out cold and hot impact test at first temperature control device and second temperature control device, and the coolant liquid in another temperature control device of control makes another temperature control device also keep running state through the return circuit circulation with the switch valve group intercommunication, but both first temperature control device 101 of fast switch-over and second temperature control device 102 carry out cold and hot impact test, can also avoid not carrying out cold and hot impact test's temperature control device because the return circuit does not circulate and lead to the circulating pump impaired.

Referring to fig. 3 and 4, the switching valve assembly includes a first connecting pipeline 23 and a switching valve 22 arranged in the first integral frame 21, and the switching valve 22 is connected through the first connecting pipeline 23; the switching valve 22 includes a first switching valve 221, a second switching valve 222, a third switching valve 223, a fourth switching valve 224, a fifth switching valve 225, and a sixth switching valve 226; the first temperature control device 101 is communicated with the first switch valve 221, the second switch valve 222 and the equipment to be tested to form a first circulation loop, and the second temperature control device 102 is communicated with the sixth switch valve 226 to form a second circulation loop; the second temperature control device 102 is communicated with the fourth switch valve 224, the fifth switch valve 225 and the equipment to be tested to form a third circulation loop; the first temperature control device 101 communicates with the first on-off valve 221 to form a fourth circulation circuit. Through the combination of the first switch valve 221, the second switch valve 222, the third switch valve 223, the fourth switch valve 224, the fifth switch valve 225 and the sixth switch valve 226, the first temperature control device 101 can be communicated with the equipment to be tested in a large circulation loop of the first circulation loop when performing a cold-hot impact test, and the second temperature control device 102 can be communicated with the sixth switch valve 226 to be communicated in a small circulation loop of the second circulation loop; when the second temperature control device 102 is communicated with the equipment to be tested in a large circulation loop of a third circulation loop during a cold and hot shock test, the first temperature control device 101 can be communicated with the third on-off valve 223 to be communicated in a small circulation loop of a fourth circulation loop, so that the circulation loops are mutually independent and convenient to control.

The second connecting pipeline 23 includes a first pipeline 231, a second pipeline 232, a third pipeline 233, a fourth pipeline 234, a fifth pipeline 235 and a sixth pipeline 236, the first pipeline 231 and the second pipeline 232 are arranged in parallel, the third pipeline 233 is vertically connected between the first pipeline 231 and the second pipeline 232, the fourth pipeline 234 and the fifth pipeline 235 are arranged in parallel, the sixth pipeline 236 is vertically connected between the fourth pipeline 234 and the fifth pipeline 235, one end of the fourth pipeline 234 close to the device to be tested is connected with the first pipeline 231, and one end of the fifth pipeline 235 close to the device to be tested is connected with the second pipeline 232. Through the combined design of the first pipeline 231, the second pipeline 232, the third pipeline 233, the fourth pipeline 234, the fifth pipeline 235 and the sixth pipeline 236, the composition and the trend of each pipeline are simple, and the mutual independence and the convenient control of each circulation loop are ensured.

Further, the first, second, third, fourth, fifth and

sixth switching valves

221, 222, 223, 224, 225 and 226 are respectively installed on the first, second, third, fourth, fifth and

sixth pipes

231, 232, 233, 234, 235 and 236, and the flow of water in the pipes is controlled by whether or not the switching valves are opened. Normally, the first, second, fourth, and

fifth switching valves

221, 222, 224, and 225 are normally closed, and the third, sixth, and

sixth switching valves

223 and 226 are normally open. By setting the first on-off valve 221, the second on-off valve 222, the fourth on-off valve 224, and the fifth on-off valve 225 to be in the normally closed state and the third on-off valve 223 and the sixth on-off valve 226 to be in the normally open state, the cold and hot impact device can be kept in the standby state before the cold and hot impact test is performed, and the first temperature control device 101 and the second temperature control device 102 can be prepared for temperature adjustment in advance in their respective small circulation circuits, and the switching speed can be further increased when in use.

Referring to fig. 1 to 4, regardless of whether the first temperature control device is used as a cold machine or a heat machine in a test, the first water inlet 18a in the first temperature control device may be connected to one end of the second pipeline 232 away from the device to be tested, or may be connected to one end of the fifth pipeline 235 away from the device to be tested, when the first water inlet 18a in the first temperature control device is connected to one end of the second pipeline 232 away from the device to be tested, the first water outlet 18b of the first temperature control device is connected to one end of the first pipeline 231 away from the device to be tested, at this time, the first switch valve 221 and the second switch valve 222 are opened, the third switch valve 223 is closed, the fourth switch valve 224 and the fifth switch valve 225 are kept in a normally closed state, and the sixth switch valve 226 is kept in a normally open state;

when the first water inlet 18a in the first temperature control device is connected with one end of the fifth pipeline 235 far away from the device to be tested, the first water outlet 18b of the first temperature control device is connected with one end of the fourth pipeline 234 far away from the device to be tested, at this time, the third switch valve 223 and the fourth switch valve 224 are opened, the sixth switch valve 226 is closed, the first switch valve 221 and the second switch valve 222 are kept in a normally closed state, and the third switch valve 223 is kept in a normally open state.

Similarly, the second temperature control device is also the same, and is not described herein again.

The valve block 20 further includes a first control system 24, the first control system 24 being in electrical signal communication with the on-off valve 22. The first control system 24 is electrically connected to the switching valve 22, so that the first switching valve 221, the second switching valve 222, the third switching valve 223, the fourth switching valve 224, the fifth switching valve 225 and the sixth switching valve 226 can be quickly and accurately controlled to open and close, and the quick switching between the first temperature control device 101 and the second temperature control device 102 can be further improved.

Referring to fig. 2, each of the first temperature control device 101 and the second temperature control device 102 includes a second integral frame 11, and a circulation pump 12, a heat exchanger 13, a heater 14, a three-way proportional valve 15, an expansion water replenishing kettle 16 and a second control system 19 which are arranged in the second integral frame 11, wherein the circulation pump 12, the heat exchanger 13, the heater 14, the three-way proportional valve 15 and the expansion water replenishing kettle 16 are connected to each other through a second connecting pipeline 17. One end of the circulating pump 12 is provided with a first water inlet 18a, the other end is divided into two paths, one path is connected with one end of the heater 14, the other path is connected with one end of the heat exchanger 13, the other ends of the heater 14 and the heat exchanger 13 are both connected with one end of the three-way proportional valve 15, the other end of the three-way proportional valve 15 is provided with a first water outlet 18b, and the expansion water supplementing kettle 16 is connected with the first water inlet 18 a. The second control system 19 is connected with the circulating pump 12, the heat exchanger 13, the heater 14, the three-way proportional valve 15 and the expansion water replenishing kettle 16 in an electric signal mode. The coolant liquid passes through circulating pump 12 and drives, divides two routes from the export of circulating pump 12 and flows through heater 14 and heat exchanger 13, and two routes (a hot one is cold) converge to first delivery port 18b after converging through tee bend proportional valve 15, can adjust the coolant liquid to required temperature and carry out the cold and hot impact test to improve this accurate control to the required coolant liquid temperature of experiment. Through the equal electric signal connection of second control system 19 with circulating pump 12, heat exchanger 13, heater 14, tee bend proportional valve 15 and inflation benefit kettle 16, can make second control system 19 carry out quick, accurate control to circulating pump 12, heat exchanger 13, heater 14, tee bend proportional valve 15 and inflation benefit kettle 16 to further improve first temperature control device 101 and second temperature control device 102's fast switch-over.

Water in the expansion water supplementing kettle 16 enters from the first water inlet 18a, is heated by the heater 14 and cooled by the heat exchanger 13 and then is collected to the three-way proportional valve 15, the three-way proportional valve 15 adjusts the flow and the temperature according to the temperature required by the test, and enters the equipment to be tested through the first water outlet 18b after the target is reached. It should be noted that, the heat exchanger 13 is provided with a second water inlet 131 and a second water outlet 132, external water enters the heat exchanger 13 through the second water inlet 131, and then flows out from the second water outlet 132, and the water in the heat exchanger 13 is cooled through multiple cycles. The second control system 19 comprises a PLC controller, a relay contactor, a temperature sensor, a flow switch, a pressure switch and the like, the water temperatures in the heater 14 and the heat exchanger 13 are sensed by the temperature sensor in the second control system 19, and the flow and the water temperature are controlled by the three-way proportional valve 15 through the flow switch, the temperature sensor, the pressure switch and the like in the second control system 19. Water in the expansion water replenishing kettle 16 enters from the first water inlet 18a, is heated by the heater 14 and cooled by the heat exchanger 13 and then is converged at the three-way proportional valve 15, the three-way proportional valve 15 adjusts the flow and the temperature according to the temperature required by the test, and the water in the expansion water replenishing kettle 16 can be used for supplementing and adjusting the cooling liquid in the first temperature control device 101 and the second temperature control device 102, so that the accurate control of the temperature of the cooling liquid required by the test is further improved.

In the cold-hot shock test, the first temperature control device 101 and the second temperature control device 102 are simultaneously connected to the valve block 20, but the first temperature control device 101 and the second temperature control device 102 are separately performed during the test. Both the first temperature control device 101 and the second temperature control device 102 can be used as a cold machine or a heat machine for testing. If the first temperature control device 101 is used as a cooler, the temperature of the water flowing out of the first temperature control device 101 is relatively low, at this time, the heat exchanger 13 has a large effect, and the second control system 19 needs to adjust the water temperature accordingly; it is also possible to use the first temperature control device 101 as a heat engine, so that the temperature of the water flowing out of the first temperature control device 101 is relatively high, and at this time, the heater 14 has a large effect, and the second control system 19 needs to adjust the water temperature accordingly. Similarly, the second temperature control device is also the same, and will not be described herein.

After the first temperature control device 101, the second temperature control device 102 and the switch valve group 20 are installed, a test is performed. The first temperature control device 101 is used as a cold machine, the second temperature control device 102 is used as a heat machine for testing, when the cold machine works, namely the first temperature control device 101 works, firstly, cooling liquid in the expansion water replenishing kettle 16 of the first temperature control device 101 is replenished to a proper position, the cooling liquid is driven by the circulating pump 12, two paths of cooling liquid flow through the heater 14 and the heat exchanger 13 from the outlet of the circulating pump 12, two paths (one heat and one cold) converge to the first water outlet 18b after converging through the three-way proportional valve 15, and the whole process is controlled by the second control system 19 and adjusted to a proper temperature. The first water inlet 18a is connected with the second pipeline 232, the first water outlet 18b is connected with the first pipeline 231, the switch valve group 20 is divided into an upper group and a lower group and controlled by the first control system 24, the first switch valve 221 and the second switch valve 222 are opened, the third switch valve 223 is closed, and cooling water enters the equipment to be tested to circulate, so that the cold machine test is completed. The operation of the heat engine, i.e., the second thermostat 102, is the same, except that the temperature of the coolant is different, and will not be described further herein.

It should be noted that, when neither the first temperature control device 101 nor the second temperature control device 102 is combined with the valve block 20, they can be individually applied to temperature control of the engine (such as inter-cooling gas temperature control, EGR gas temperature control, etc.), and thus, the device resources can be fully utilized.

Through the description above, can know, the utility model provides a pair of modular cold and hot impact device, the cold and hot impact test of the equipment that awaits measuring is realized to the combination through two temperature control device and ooff valve group, two temperature control device functions are the same, can regard as cold machine or heat machine, can carry out cold and hot impact test at one of them of first temperature control device and second temperature control device, control another temperature control device of coolant liquid in the temperature control device through the return circuit circulation with ooff valve group intercommunication and make another temperature control device also keep the running state, both can fast switch over first temperature control device 101 and second temperature control device 102 and carry out cold and hot impact test, can also avoid not carrying out cold and hot impact test's temperature control device because the return circuit does not circulate and lead to the circulating pump impaired. Meanwhile; two temperature control devices also can be applied to the temperature control of engine respectively alone when not making up with the ooff valve group respectively (for example well cold gaseous temperature control, the gaseous temperature control of EGR etc.), the utility model has the advantages of use flexibility, response are quick, the control by temperature change precision is high, make full use of equipment resource.

The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art can easily think of the changes or substitutions within the technical scope of the present invention, and all should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A cold and hot impact device is characterized by comprising a temperature control device (10) and a switch valve group (20), wherein the temperature control device (10) comprises a first temperature control device (101) and a second temperature control device (102), a first end of the switch valve group (20) is connected with the first temperature control device (101), a second end of the switch valve group (20) is connected with the second temperature control device (102), and a third end of the switch valve group (20) is connected with equipment to be tested;

the switch valve group (20) enables the first temperature control device (101) to be communicated with the equipment to be tested to form a first circulation loop under a first working condition, and enables the second temperature control device (102) to be communicated with the switch valve group (20) to form a second circulation loop; the switch valve group (20) can enable the second temperature control device (102) to be communicated with the equipment to be tested to form a third circulation loop under a second working condition, and enable the first temperature control device (101) to be communicated with the switch valve group to form a fourth circulation loop.

2. A cold-thermal impact device according to claim 1, wherein said switching valve group comprises a first connecting pipe (23) and a switching valve (22) arranged in a first integral frame (21), said switching valve (22) being connected through said first connecting pipe (23); the switching valve (22) includes a first switching valve (221), a second switching valve (222), a third switching valve (223), a fourth switching valve (224), a fifth switching valve (225), and a sixth switching valve (226); the first temperature control device (101) is communicated with the first switch valve (221), the second switch valve (222) and the equipment to be tested to form the first circulation loop, and the second temperature control device (102) is communicated with the sixth switch valve (226) to form the second circulation loop; the second temperature control device (102) is communicated with the fourth switch valve (224), the fifth switch valve (225) and the equipment to be tested to form a third circulation loop; the first temperature control device (101) is communicated with the first switch valve (221) to form the fourth circulation loop.

3. A cold-thermal impact device according to claim 2, wherein said first connecting pipe (23) comprises a first pipe (231), a second pipe (232), a third pipe (233), a fourth pipe (234), a fifth pipe (235) and a sixth pipe (236), said first pipe (231) and said second pipe (232) are arranged in parallel, said third pipe (233) is vertically connected between said first pipe (231) and said second pipe (232), said fourth pipe (234) and said fifth pipe (235) are arranged in parallel, said sixth pipe (236) is vertically connected between said fourth pipe (234) and said fifth pipe (235), said fourth pipe (234) is connected to said first pipe (231) near one end of said device under test, and said fifth pipe (235) is connected to said second pipe (232) near one end of said device under test.

4. A cold-thermal impact device according to claim 3, wherein said first switching valve (221), said second switching valve (222), said third switching valve (223), said fourth switching valve (224), said fifth switching valve (225) and said sixth switching valve (226) are installed on said first pipe (231), said second pipe (232), said third pipe (233), said fourth pipe (234), said fifth pipe (235) and said sixth pipe (236), respectively, said first switching valve (221), said second switching valve (222), said fourth switching valve (224), said fifth switching valve (225) are in a normally closed state, and said third switching valve (223) and said sixth switching valve (226) are in a normally open state.

5. A cold-thermal shock device according to claim 4, wherein the first water inlet (18 a) of the first temperature control device is connected to the end of the second pipe (232) remote from the device under test, and the first water outlet (18 b) of the first temperature control device (101) is connected to the end of the first pipe (231) remote from the device under test; a first water inlet (18 a) in the second temperature control device is connected with one end, far away from the equipment to be tested, of the fifth pipeline (235), and a first water outlet (18 b) of the second temperature control device (102) is connected with one end, far away from the equipment to be tested, of a fourth pipeline (234);

when the first temperature control device is connected with the equipment to be tested, the first switch valve (221) and the second switch valve (222) are opened, the third switch valve (223) is closed, the fourth switch valve (224) and the fifth switch valve (225) are kept in a normally closed state, and the sixth switch valve (226) is kept in a normally open state; when the second temperature control device is connected with the equipment to be tested, the fourth switch valve (224) and the fifth switch valve (225) are opened, the sixth switch valve (226) is closed, the first switch valve (221) and the second switch valve (222) are kept in a normally closed state, and the third switch valve (223) is kept in a normally open state.

6. A cold-thermal shock device according to claim 1, wherein said switching valve group (20) further comprises a first control system (24), said first control system (24) being in electrical signal connection with said switching valve (22).

7. A cold-hot impact device according to claim 1, wherein said first temperature control device (101) and said second temperature control device (102) each comprise a circulation pump (12), a heat exchanger (13), a heater (14), a three-way proportional valve (15), and an expansion water supplement tank (16) arranged in a second integral frame (11), said circulation pump (12), said heat exchanger (13), said heater (14), said three-way proportional valve (15), and said expansion water supplement tank (16) being interconnected by a second connecting pipe (17).

8. A cold-hot impact device according to claim 7, wherein one end of said circulating pump (12) is provided with a first water inlet (18 a), the other end is divided into two paths, one path is connected with one end of said heater (14), the other path is connected with one end of said heat exchanger (13), the other ends of said heater (14) and said heat exchanger (13) are both connected with one end of said three-way proportional valve (15), the other end of said three-way proportional valve (15) is provided with a first water outlet (18 b), and said expansion water supplementing kettle (16) is connected with said first water inlet (18 a).

9. A cold-thermal shock device according to claim 8, wherein a second water inlet (131) and a second water outlet (132) are provided in the heat exchanger (13), and water in the heat exchanger (13) flows into or out of the heat exchanger (13) through the second water inlet (131) and the second water outlet (132) to cool the heat exchanger (13).

10. A cold-thermal shock device according to claim 9, characterized in that the first temperature control device (101) and the second temperature control device (102) each comprise a second control system (19), the second control system (19) being in electrical connection with the circulation pump (12), the heat exchanger (13), the heater (14), the three-way proportional valve (15) and the expansion makeup kettle (16).