A windless thermostat

Abstract

The application discloses a windless constant-temperature box, which adopts an electric heating wire to heat and an evaporator to refrigerate, simultaneously adopts multiple temperature probes to acquire temperatures at multiple positions of an inner box, and adopts a circulating pipe to drive fluid circulation to realize rapid and uniform of the inner box when the temperature of the inner box is uneven. In addition, the application also has two sets of shell independent or cooperating refrigeration systems, one set is a compressor system driven by a compressor, and the other set is a circulating pump system driven by a circulating pump. When in use, different systems can be selected according to different needs to independently operate refrigeration or combined operation refrigeration. When a lower temperature of the inner box is needed, the circulating pump system can be used as a pre-cooling system of the compressor system to realize cascade refrigeration. The whole refrigeration system has multiple functions, and can be started according to different needs to save energy or reach a lower test temperature under the premise of meeting the needs.

Description

TECHNICAL FIELD

[0001] The present application relates to test equipment, in particular to a windless constant temperature oven. BACKGROUND

[0002] The windless constant temperature test oven is a device for simulating a precise windless constant temperature environment for testing high-performance electronic products (such as computer whole machine, display, terminal, vehicle electronic product, power supply, motherboard, monitor, and switching charger), and is a key experimental device for improving product stability and reliability, and is an important production process for improving product quality and competitiveness of various production enterprises.

[0003] The existing windless constant temperature test oven uses ventilation between the inner box and the outer box, and the test sample is placed in the inner box, and the ventilation is used to control the temperature. However, the temperature range that can be achieved by this method is very limited, and some extreme temperature environments cannot be simulated. SUMMARY

[0004] In view of the above defects of the prior art, the technical problem to be solved by the present application is to provide a windless constant temperature oven which can obtain simulation test in a larger temperature range.

[0005] To achieve the above-mentioned purpose, the present application provides a windless constant temperature oven, which comprises an electronic heat exchanger, an inner box and an outer box, the inner box is installed in the outer box, and an electric heating wire and a circulating pipe are installed in the gap between the inner box and the outer box.

[0006] A plurality of temperature probes are installed on the inner box, the temperature probes are connected to a temperature sensor, and the temperature sensor inputs the detected temperature signal to an industrial computer; an evaporator is installed in the inner box, and an evaporator pipe is installed on the evaporator.

[0007] The inlet end of the evaporator pipe is communicated with the outlet of an expansion valve, the outlet end is communicated with the inlet of a compressor, the outlet of the compressor is communicated with the inlet of a condenser, and the outlet of the condenser is communicated with the inlet of the expansion valve.

[0008] A pre-cooling pipe is installed in the condenser, the inlet end of the pre-cooling pipe is communicated with the second outlet of a first pre-cooling reversing valve, the outlet end of the pre-cooling pipe is communicated with the second inlet of a second pre-cooling reversing valve, the inlet of the first pre-cooling reversing valve is communicated with the outlet of a circulating pump, the first outlet of the first pre-cooling reversing valve is communicated with the inlet of the circulating pipe, the first pre-cooling reversing valve is used to control the inlet to be selectively communicated with the first outlet and the second outlet, the second inlet of the second pre-cooling reversing valve is communicated with the outlet of the pre-cooling pipe, the first inlet of the second pre-cooling reversing valve is communicated with the outlet of the circulating pipe, the outlet of the second pre-cooling reversing valve is communicated with the inlet of a uniform heating reversing valve, and the outlet of the second pre-cooling reversing valve is selectively communicated with the first inlet and the second inlet.

[0009] The first outlet of the heat equalizing valve is communicated with the inlet of the refrigeration pipe of the electronic heat exchanger, the second outlet of the heat equalizing valve is communicated with the inlet of the circulating pump, the outlet of the refrigeration pipe is communicated with the inlet of the one-way valve, the outlet of the one-way valve is communicated with the inlet of the circulating pump, and the heat equalizing valve is used for making the inlet thereof selectively communicated with the first outlet and the second outlet.

[0010] As a further improvement of the present application, a rack and a box door are further included, the electronic heat exchanger is mounted on the rack, and the box door is mounted on the rack.

[0011] One side of the box door is hinged to the rack through a hinge, the other side of the box door is locked to the rack through a box door lock, and an observation window is further arranged on the box door; a support is further mounted in the rack, an installation space is formed at the support, an installation seat is mounted in the installation space, an installation seat groove is formed on the inner side of the installation seat, and the electronic heat exchanger is clamped and mounted in the installation seat groove.

[0012] As a further improvement of the present application, the electric heating wire and the circulating pipe are tightly attached to the outer wall of the inner box, and a heat preservation and insulation material is filled between the inner box and the outer box; the electric heating wire is controlled to be turned on and turned off through a contactor, and the contactor is controlled through an industrial computer.

[0013] As a further improvement of the present application, the evaporator includes an evaporator shell, heat conducting sheets and an evaporator pipe, the heat conducting sheets are mounted on the evaporator shell, and the evaporator shell is mounted on the inner box; the heat conducting sheets are multiple, and the evaporator pipe is fixedly assembled with each heat conducting sheet.

[0014] As a further improvement of the present application, the electronic heat exchanger includes two heat exchange shells and two heat exchange seats, the two heat exchange seats are respectively mounted in the corresponding heat exchange shells, and installation plates and heat exchange seat grooves are arranged on the two heat exchange seats; the installation plates are mounted on the corresponding heat exchange shells, one of the heat exchange seats is further provided with a liquid cavity communicated with the heat exchange seat groove, and a heat conducting film is mounted on the heat exchange seat groove and seals the opening end of the liquid cavity.

[0015] The liquid cavity is further communicated with a piston hole through a connecting groove, the piston hole is axially slidably assembled with a piston which is sealed with the piston hole; the piston is mounted on one end of a piston screw, and the piston hole is arranged on the corresponding heat exchange seat; the other end of the piston screw is threaded and assembled with the heat exchange seat, and the liquid cavity, the connecting groove and the piston hole are filled with heat conducting oil.

[0016] The piston extrudes the heat conducting oil to the liquid cavity to make the oil pressure in the liquid cavity rise, so that the heat conducting film is pressed on the corresponding heat seat.

[0017] As a further improvement of the present application, the heat exchange seat grooves of the two heat exchange seats are communicated to form an exchange groove, and the cold seat and the hot seat are clamped and installed in the exchange groove; the cold seat and the hot seat are respectively clamped into the corresponding heat exchange seat grooves, the thermoelectric refrigeration piece is installed on the cold seat, and the refrigeration surface of the thermoelectric refrigeration piece is tightly attached to the cold seat and the heating surface is tightly attached to the hot seat.

[0018] The heat sink is installed on the heat exchange seat assembled with the hot seat, the heat sink is installed with a heat absorption pipe, the heat absorption pipe introduces the flowing heat dissipation liquid to dissipate heat for the heat exchange seat installed with the hot seat; the refrigeration device is installed on the other heat exchange seat, and the refrigeration pipe is installed on the refrigeration device.

[0019] As a further improvement of the present application, the hot seat is provided with a boss on the end face of the end facing the cold seat, the cold seat is provided with a cold seat groove and a mounting groove on the end facing the hot seat, the cold seat groove and the mounting groove are communicated with each other, the thermoelectric refrigeration piece is installed in the mounting groove, the refrigeration surface of the thermoelectric refrigeration piece is tightly attached to the inner end face of the mounting groove, and the boss is clamped into the cold seat groove and tightly attached to the heating surface of the thermoelectric refrigeration piece.

[0020] As a further improvement of the present application, the heat insulation pad is clamped and installed between the two heat exchange seats and outside the cold seat and the hot seat, and the heat insulation pad is made of heat insulation material.

[0021] As a further improvement of the present application, the cold seat and the hot seat are respectively assembled and fixed with the end block at the end penetrating out of the exchange groove, and the heat insulation sheet is clamped between the cold seat, the hot seat and the end block, and the heat insulation sheet is made of heat insulation material.

[0022] As a further improvement of the present application, the thermoelectric refrigeration piece is electrically connected with one end of the wire, the other end of the wire is electrically connected with the power source through the relay or the contactor, and the relay or the contactor is used for controlling the on-off of the current between the wire and the power source.

[0023] The second bolt is respectively screwed with the corresponding nut after penetrating through the two heat exchange seats to realize the assembly and fixation of the two heat exchange seats; the first bolt is screwed and assembled with the corresponding nut after penetrating through the connecting convex strips of the two heat exchange shells to realize the assembly and fixation of the two heat exchange shells; and the heat insulation pad is clamped between the two heat exchange shells.

[0024] The heat exchange pipe is installed on the heat sink and the refrigeration device, the heat exchange pipe takes away the heat on the heat sink and the refrigeration device through the internal flowing fluid to realize heat exchange and cooling, and the installation mode and structure of the heat exchange pipe are the same as those of the refrigeration pipe and the heat absorption pipe.

[0025] One end of the heat exchange pipe installed on the heat absorber is communicated with the first liquid outlet joint of the liquid supply valve, and one end of the heat exchange pipe installed on the heat absorber is communicated with the second liquid outlet joint of the liquid supply valve; the first liquid inlet joint and the second liquid inlet joint of the liquid supply valve are respectively communicated with the liquid outlet of the heat radiator, the liquid inlet of the heat radiator is communicated with the outlet of the heat pump, the inlet of the heat pump is respectively communicated with the other end of the heat exchange pipe installed on the heat absorber and the other end of the heat exchange pipe installed on the heat absorber, and the liquid supply valve is used for controlling the liquid supply flow of the heat exchange pipe installed on the heat absorber and the heat exchange pipe installed on the heat absorber; the heat radiator is opposite to the fan, and the airflow blown by the fan passes through the heat radiator;

[0026] The heat absorber is further installed between the heat radiator and the corresponding heat exchange seat, the heat absorber is made of high thermal conductivity material and is internally provided with a boiling cavity, the boiling cavity is filled with a liquid that boils at a certain temperature, and the boiling cavity is communicated with one end of a heat conduction pipe, the heat conduction pipe is installed on the heat absorber, the other end of the heat conduction pipe is communicated with one end of a connecting pipe, and the other end of the connecting pipe is communicated with an expansion joint of the liquid supply valve.

[0027] As a further improvement of the application, the liquid supply valve comprises a valve shell, an electromagnet, an end cover, and a valve core, a valve cavity is arranged in the valve shell, the valve core is sealingly and slidingly arranged in the valve cavity, a first liquid inlet joint, a second liquid inlet joint, a first liquid outlet joint, a second liquid outlet joint, and an expansion joint are respectively arranged on the valve shell, the first liquid inlet joint, the second liquid inlet joint, the first liquid outlet joint, and the second liquid outlet joint are communicated with the valve cavity, the expansion joint is communicated with an expansion ring, the expansion ring is made of elastic material and has a sealed expansion cavity inside, and the expansion cavity is communicated with the expansion joint.

[0028] The expansion ring is installed in an end cover cavity arranged between an inner cylinder and an outer cylinder, the inner cylinder and the outer cylinder are both installed on the end cover, the end cover is installed on one end of the valve shell and seals one end of the valve cavity, and a second spring is installed in the inner cylinder, the second spring applies a repulsive force to the valve core to prevent the valve core from moving towards the inner cylinder.

[0029] The valve core is respectively provided with a first ring groove and a second ring groove, when the heat radiator separately cools the fluid in the circulating pipe, the second ring groove is communicated with the second liquid inlet joint and the second liquid outlet joint, and the first ring groove is not communicated with the first liquid inlet joint and the first liquid outlet joint, at this time, the expansion ring does not expand, and thus does not apply a pushing force to the valve core; when the thermoelectric cooling piece is started, the first ring groove is communicated with the first liquid inlet joint and the first liquid outlet joint, and the second ring groove is not communicated with the second liquid inlet joint and the second liquid outlet joint.

[0030] The valve core is further assembled and fixed with a lock ring through a connecting shaft, one end of the lock ring is assembled with the telescopic shaft, the other end of the telescopic shaft is sleeved with the first spring, penetrates out of the valve shell, and is then assembled into the electromagnet, and the electromagnet is installed on the valve shell.

[0031] The valve shell is provided with a stop cavity near one end of the electromagnet, the stop cavity is provided with a stop ring and a limiting ring, the stop ring is provided with an elastic sheet, and the elastic sheet is provided with a stop protrusion.

[0032] The present application has the following advantages:

[0033] The present application adopts electric heating wire heating and evaporator refrigeration, simultaneously adopts multiple temperature probes to obtain the temperature of multiple positions of the inner box, and adopts a circulating pipe to drive fluid circulation to realize rapid and uniform of the inner box when the temperature of the inner box is uneven. In addition, the present application has two sets of independent or cooperating refrigeration systems, one set is a compressor system driven by a compressor, and the other set is a circulating pump system driven by a circulating pump. When in use, different systems can be selected according to different needs to independently operate refrigeration or combined operation refrigeration. When a lower temperature of the inner box is required, the circulating pump system can be used as a pre-cooling system of the compressor system to realize cascade refrigeration. The whole refrigeration system has multiple functions, and can be started according to different needs to save energy as much as possible or achieve a lower test temperature under the premise of meeting the needs. BRIEF DESCRIPTION OF DRAWINGS

[0034] Figures 1-2 is a structural schematic diagram of the present application;

[0035] Figures 3-5 is a partial structural schematic diagram of the present application;

[0036] Figures 6-8 is a structural schematic diagram of the fan 682, the radiator 681, the electronic heat exchanger 300 and the liquid supply valve 800;

[0037] Figures 9-10 is a structural schematic diagram of the electronic heat exchanger 300 and the mounting seat 170;

[0038] Figures 11-12 is a structural schematic diagram of the electronic heat exchanger 300;

[0039] Figures 13-14 is a partial structural schematic diagram of the electronic heat exchanger 300;

[0040] Figures 15-16 is a structural schematic diagram of the heat exchange seat 320, the heat insulation pad 410, the cold seat 340, the hot seat 350 and the end block 330;

[0041] Figure 17 is a sectional view of the heat exchange seat 320, the heat insulation pad 410, the cold seat 340 and the hot seat 350 located at the center surface of the axis of the piston bolt 530;

[0042] Figure 18 is a structural schematic diagram of the hot seat 350, the end block 330 and the thermoelectric refrigeration sheet 630;

[0043] Figures 19-20 is a structural schematic diagram of the cold seat 340, the hot seat 350, and the end block 330;

[0044] Figure 21 is a sectional view of the cold seat 340, the hot seat 350, the end block 330, and the thermoelectric refrigeration sheet 630 located at the center surface of the boss 351;

[0045] Figure 22 is a structural schematic diagram of one of the heat exchange seats 320;

[0046] Figure 23 is a structural schematic diagram of another heat exchange seat 320;

[0047] Figure 24 is a sectional view of the heat exchange seat 320, the heat insulation pad 410, the cold seat 340, the hot seat 350, the end block 330, and the thermoelectric refrigeration sheet 630 located at the center surface of the boss 351;

[0048] Figure 25 is a sectional view of the inner box 180 and the outer box 190 in the longitudinal direction;

[0049] Figure 26 is a structural schematic diagram of the liquid supply valve 800;

[0050] Figure 27 is a sectional view of the liquid supply valve 800 located at the center surface of the axis of the telescopic shaft 821, and a sectional view of the heat conduction block 680 located at the center surface of the axis of the heat conduction pipe 806;

[0051] Figure 28 is a sectional view of the liquid supply valve 800 located at another center surface of the axis of the telescopic shaft 821;

[0052] Figure 29 is Figure 27 is a state diagram of the valve core 840 switching to a high heat dissipation mode in the liquid supply valve 800;

[0053] Figure 30 is a block diagram of the temperature control system of the present application. DETAILED DESCRIPTION

[0054] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application.

[0055] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0056] Referring to Figures 1-8 The windless thermostat of the embodiment comprises a frame 110, a cabinet door 120, one side of which is hinged to the frame 110 through a hinge 140, and the other side of which is locked to the frame 110 through a cabinet door lock 150, and an observation window 130 is further arranged on the cabinet door 120 for facilitating the operator to observe the situation inside the inner cabinet 180.

[0057] A bracket 160 is further arranged in the frame 110, and a mounting space is formed at the bracket 160, in which a mounting seat 170 and related equipment of a temperature control system are arranged.

[0058] Referring to Figure 25 The frame 110 is further provided with an outer cabinet 190 and an inner cabinet 180, the inner cabinet 180 is arranged in the outer cabinet 190, and an electric heating wire 660 and a circulating pipe 650 are arranged in the gap between the inner cabinet 180 and the outer cabinet 190, the electric heating wire 660 and the circulating pipe 650 are tightly attached to the outer wall of the inner cabinet 180, and a heat insulation material is filled between the inner cabinet 180 and the outer cabinet 190.

[0059] The electric heating wire 660 generates heat, and the circulating pipe 650 circulates fluid to control the temperature of the inner cabinet 180, and the inner cabinet 180 is made of a material with high thermal conductivity.

[0060] Referring to Figures 3-4 , Figure 25 , Figure 30 The electric heating wire is controlled by a contactor, and the contactor is controlled by an industrial computer; an evaporator 200 is arranged in the inner cabinet 180, the evaporator 200 comprises an evaporator shell, a heat conduction sheet and an evaporator pipe, the heat conduction sheet is arranged on the evaporator shell, and the evaporator shell is arranged on the inner cabinet 180; the heat conduction sheet has multiple pieces, and the evaporator pipe is fixed with each piece, and the evaporator pipe and the heat conduction sheet are made of a material with high thermal conductivity.

[0061] The inlet end of the evaporator tube is communicated with the outlet of the expansion valve, the outlet end is communicated with the inlet of the compressor, the outlet of the compressor is communicated with the inlet of the condenser, the outlet of the condenser is communicated with the inlet of the expansion valve, and the condenser can be selected in a wind-cooled mode. When refrigeration is needed, the compressor outputs refrigerant to the condenser for condensation, the refrigerant enters the expansion valve and then enters the evaporator to absorb the heat of the evaporator, and finally the refrigerant returns to the compressor for circulation. In this way, the inside of the inner box 180 can be cooled by the evaporator 200, and the open end of the inner box 180 is sealed by the box door 120.

[0062] The pre-cooling pipe is installed in the condenser, and the pre-cooling pipe is bent and installed on the condenser to increase the residence time of the fluid inside the pre-cooling pipe, that is, to increase the heat exchange time of the fluid in the pre-cooling pipe with the condenser. The inlet end of the pre-cooling pipe is communicated with the second outlet of the first pre-cooling reversing valve, the outlet end of the pre-cooling pipe is communicated with the second inlet of the second pre-cooling reversing valve, the inlet of the first pre-cooling reversing valve is communicated with the outlet of the circulating pump, the first outlet of the first pre-cooling reversing valve is communicated with the inlet of the circulating pipe, and the first pre-cooling reversing valve is used to control the inlet to be selectively communicated with the first outlet or the second outlet. The second inlet of the second pre-cooling reversing valve is communicated with the outlet of the pre-cooling pipe, the first inlet of the second pre-cooling reversing valve is communicated with the outlet of the circulating pipe, the outlet of the second pre-cooling reversing valve is communicated with the inlet of the soaking reversing valve, and the outlet of the second pre-cooling reversing valve is selectively communicated with the first inlet or the second inlet.

[0063] The first outlet of the soaking reversing valve is communicated with the inlet of the refrigeration pipe 621 of the electronic heat exchanger, and the second outlet of the soaking reversing valve is communicated with the inlet of the circulating pump. The outlet of the refrigeration pipe 621 is communicated with the inlet of the one-way valve, and the outlet of the one-way valve is communicated with the inlet of the circulating pump. The soaking reversing valve is used to selectively communicate the inlet with the first outlet or the second outlet.

[0064] The first pre-cooling reversing valve, the second pre-cooling reversing valve, and the soaking reversing valve are all solenoid valves, and are controlled by an industrial computer to work.

[0065] Referring to Figures 3-30 The electronic heat exchanger 300 includes two heat exchange shells 310 and two heat exchange seats 320. The two heat exchange seats 320 are respectively installed in the corresponding heat exchange shells 310, and the two heat exchange seats 320 are respectively provided with mounting plates 321 and heat exchange seat grooves 322. The mounting plate 321 is installed on the corresponding heat exchange shell 310 by screws. One of the heat exchange seats 320 is further provided with a liquid cavity 323 communicated with the heat exchange seat groove 322. A heat-conducting film 440 is installed on the heat exchange seat groove 322, and the heat-conducting film 440 is elastic. The heat-conducting film 440 seals the open end of the liquid cavity 323.

[0066] The liquid cavity 323 is also communicated with the piston hole 325 through the connecting groove 324, the piston hole 325 is sealingly and axially slidably fitted with the piston 531, the piston 531 is installed on one end of the piston screw 530, the piston hole 325 is arranged on the corresponding heat exchange seat 320, the other end of the piston screw 530 penetrates out of the heat exchange seat 320 and is threadedly and rotatably fitted with the heat exchange seat 320, the liquid cavity 323, the connecting groove 324 and the piston hole 325 are filled with the heat-conducting oil. In the initial state (state 1), the piston 531 extrudes the heat-conducting oil to the liquid cavity 323 so that the oil pressure in the liquid cavity 323 rises to press the heat-conducting film 440 on the corresponding heat seat 350, so that the cold seat 340 and the heat seat 350 are clamped in the exchange groove 301, the exchange groove 301 is formed by the heat exchange groove 322 of the two heat exchange seats 320. Figure 17 In the initial state (state 1), the piston 531 extrudes the heat-conducting oil to the liquid cavity 323 so that the oil pressure in the liquid cavity 323 rises to press the heat-conducting film 440 on the corresponding heat seat 350, so that the cold seat 340 and the heat seat 350 are clamped in the exchange groove 301, the exchange groove 301 is formed by the heat exchange groove 322 of the two heat exchange seats 320.

[0067] The cold seat 340 and the heat seat 350 are clamped and installed in the exchange groove 301, the cold seat 340 and the heat seat 350 are clamped into the corresponding heat exchange groove 322, the heat seat 350 is provided with the boss 351 on the end face facing the cold seat 340, the cold seat 340 is provided with the cold seat groove 341 and the mounting groove 342 on the end facing the heat seat 350, the cold seat groove 341 and the mounting groove 342 are communicated with each other, the thermoelectric refrigeration piece 630 is mounted in the mounting groove 342, the refrigeration face of the thermoelectric refrigeration piece 630 is tightly attached to the inner end face of the mounting groove 342, and the boss 351 is clamped into the cold seat groove 341 and tightly attached to the heating face of the thermoelectric refrigeration piece 630.

[0068] The cold seat 340 and the heat seat 350 are clamped and installed in the exchange groove 301, the cold seat 340 and the heat seat 350 are clamped into the corresponding heat exchange groove 322, the heat seat 350 is provided with the boss 351 on the end face facing the cold seat 340, the cold seat 340 is provided with the cold seat groove 341 and the mounting groove 342 on the end facing the heat seat 350, the cold seat groove 341 and the mounting groove 342 are communicated with each other, the thermoelectric refrigeration piece 630 is mounted in the mounting groove 342, the refrigeration face of the thermoelectric refrigeration piece 630 is tightly attached to the inner end face of the mounting groove 342, and the boss 351 is clamped into the cold seat groove 341 and tightly attached to the heating face of the thermoelectric refrigeration piece 630.

[0069] The cold seat 340 and the heat seat 350 are clamped and installed in the exchange groove 301, the cold seat 340 and the heat seat 350 are clamped into the corresponding heat exchange groove 322, the heat seat 350 is provided with the boss 351 on the end face facing the cold seat 340, the cold seat 340 is provided with the cold seat groove 341 and the mounting groove 342 on the end facing the heat seat 350, the cold seat groove 341 and the mounting groove 342 are communicated with each other, the thermoelectric refrigeration piece 630 is mounted in the mounting groove 342, the refrigeration face of the thermoelectric refrigeration piece 630 is tightly attached to the inner end face of the mounting groove 342, and the boss 351 is clamped into the cold seat groove 341 and tightly attached to the heating face of the thermoelectric refrigeration piece 630.

[0070] One of the heat exchange seats 320 is provided with a heat absorber 610, and the heat absorber 610 is provided with a heat absorbing pipe 611. The heat absorbing pipe 610 introduces flowing heat dissipation liquid, such as cold water, to dissipate heat from the heat exchange seat 320 provided with the heat seat 350. Another heat exchange seat 320 is provided with a refrigeration device 620, and the refrigeration device 620 is provided with a refrigeration pipe 621. The thermoelectric refrigeration sheet 630 is electrically connected to one end of the wire 640, and the other end of the wire 640 is electrically connected to the power supply through a relay or contactor. The relay or contactor is used to control the on-off of the current between the wire 640 and the power supply, that is, to control the start or stop of the thermoelectric refrigeration sheet 630.

[0071] In use, the thermoelectric refrigeration sheet 630 is powered to make the refrigeration surface refrigerate and the heating surface heat. The heat of the heating surface is transferred to the heat absorber 610, and then is taken away by the heat dissipation liquid, so as to ensure that the refrigeration surface has better refrigeration effect. The circulating pump is started to drive the fluid (such as heat conducting oil) to circulate between the circulating pipe and the condenser.

[0072] Preferably, the second bolt 520 passes through the two heat exchange seats 320 and is screwed with corresponding nuts to realize the assembly and fixation of the two heat exchange seats 320.

[0073] Preferably, the two heat exchange shells 310 are further respectively provided with connecting convex strips 311. The first bolt 510 passes through the connecting convex strips 311 of the two heat exchange shells 310 and is screwed with corresponding nuts to realize the assembly and fixation of the two heat exchange shells 310. The heat insulation pad 410 is clamped between the two heat exchange shells 310 to realize the heat insulation between the two heat exchange shells 310.

[0074] Preferably, the heat insulation pad 410 is provided with a missing groove 411. The missing groove 411 is mainly used for facilitating the installation of the heat insulation pad 410. The missing groove 411 is provided with a supplementary heat insulation pad 420, and the supplementary heat insulation pad 420 is clamped by the two heat exchange shells 310.

[0075] Referring to Figure 17 When the cold seat 340 and the heat seat 350 need to be taken out for maintenance, the piston bolt 530 is rotated, the piston screw 530 carries the piston 531 to move upwards, so that the piston 531 forms a suction negative pressure on the piston hole 325 and the liquid cavity 323, and the heat conducting oil is sucked into the piston hole 325. At this time, the pressure of the liquid cavity is reduced, the extrusion force of the heat conducting film 440 on the heat seat 350 is reduced, so that the cold seat 340 and the heat seat 350 can be taken out from the exchange slot 301 through the end block 330. The heat conducting film 440 and the heat conducting oil have high heat conductivity, so that the heat of the thermoelectric refrigeration sheet 630 is quickly transferred to the heat absorber 610 for heat dissipation. In the embodiment, the structures of the heat absorber 610, the refrigeration device 620 and the heat sink 681 can be the same as those of the evaporator.

[0076] Referring to Figures 3-8 ,Figure 14 、 Figures 26-29 、 Figure 30 The heat absorber 610 and the refrigeration device 620 are respectively provided with heat exchange pipes 601, which are used to take away the heat on the heat absorber 610 and the refrigeration device 620 by flowing fluid inside to realize heat exchange and cooling. The heat exchange pipes 601 are installed in the same way and have the same structure as the refrigeration pipes 621 and the heat absorption pipes 611, i.e. they are installed on the heat absorber 610 and the refrigeration device 620 by bending, so as to increase the contact time of the fluid inside the heat exchange pipes 601 with the heat absorber 610 and the refrigeration device 620, and increase the heat exchange amount.

[0077] One end of the heat exchange pipe 601 installed on the heat absorber 610 is communicated with the first liquid outlet joint 802 of the liquid supply valve 800, and one end of the heat exchange pipe 601 installed on the refrigeration device 620 is communicated with the second liquid outlet joint 804 of the liquid supply valve 800. The first liquid inlet joint 801 and the second liquid inlet joint 803 of the liquid supply valve 800 are respectively communicated with the liquid outlet of the radiator 681, the liquid inlet of the radiator 681 is communicated with the outlet of the heat dissipation pump, the inlet of the heat dissipation pump is respectively communicated with the other end of the heat exchange pipe 601 installed on the heat absorber 610 and the other end of the heat exchange pipe 601 installed on the refrigeration device 620, and the liquid supply valve 800 is used to control the liquid supply flow of the heat exchange pipe 601 installed on the heat absorber 610 and the heat exchange pipe 601 installed on the refrigeration device 620.

[0078] The radiator 681 is opposite to the fan 682, and the airflow blown by the fan 682 passes through the radiator 681, so as to take away the heat on the radiator 681, and thus realize heat dissipation of the fluid entering the radiator 681, which will flow through the heat exchange pipe 601 installed on the heat absorber 610 and / or the heat exchange pipe 601 installed on the refrigeration device 620, so as to realize heat dissipation of the heat absorber 610 and the refrigeration device 620.

[0079] The heat absorber 610 and the refrigeration device 620 are respectively provided with heat exchange pipes 601, which are used to take away the heat on the heat absorber 610 and the refrigeration device 620 by flowing fluid inside to realize heat exchange and cooling. The heat exchange pipes 601 are installed in the same way and have the same structure as the refrigeration pipes 621 and the heat absorption pipes 611, i.e. they are installed on the heat absorber 610 and the refrigeration device 620 by bending, so as to increase the contact time of the fluid inside the heat exchange pipes 601 with the heat absorber 610 and the refrigeration device 620, and increase the heat exchange amount.

[0080] The liquid supply valve 800 comprises a valve shell 810, an electromagnet 820, an end cover 830, a valve core 840, the valve shell 810 is provided with a valve cavity 811, the valve core 840 is sealingly and slidingly installed in the valve cavity 811, the valve shell 810 is respectively provided with a first liquid inlet connector 801, a second liquid inlet connector 803, a first liquid outlet connector 802, a second liquid outlet connector 804 and an expansion connector 805, the first liquid inlet connector 801, the second liquid inlet connector 803, the first liquid outlet connector 802 and the second liquid outlet connector 804 are communicated with the valve cavity 811, the expansion connector 805 is communicated with an expansion ring 870, the expansion ring 870 is made of elastic material and the inside of the expansion ring 870 is a sealed expansion cavity 871, the expansion cavity 871 is communicated with the expansion connector 805.

[0081] The expansion ring 870 is installed in an end cover cavity 833, the end cover cavity 833 is arranged between an inner cylinder 832 and an outer cylinder 831, the inner cylinder 832 and the outer cylinder 831 are both installed on the end cover 830, the end cover 830 is installed on one end of the valve shell 810 and seals one end of the valve cavity 811. The inner cylinder 832 is provided with a second spring 862, the second spring 862 applies an elastic force to the valve core 840 to prevent the valve core 840 from moving towards the inner cylinder 832, but due to the gravity of the valve core and the thrust of the first spring, the valve core 840 remains in the initial state.

[0082] The valve core 840 is respectively provided with a first ring groove 841 and a second ring groove 842, when the refrigeration device 620 independently cools the fluid in the circulating pipe, the second ring groove 842 is communicated with the second liquid inlet connector 803 and the second liquid outlet connector 804 and the first ring groove 841 is not communicated with the first liquid inlet connector 801 and the first liquid outlet connector 802, at this time, the expansion ring 870 does not expand and does not apply a thrust force to the valve core; when the thermoelectric refrigeration piece is started, the first ring groove 841 is communicated with the first liquid inlet connector 801 and the first liquid outlet connector 802 and the second ring groove 842 is not communicated with the second liquid inlet connector 803 and the second liquid outlet connector 804, so as to ensure that the heat sink can fully dissipate heat from the heat absorber 610, so that the refrigeration temperature of the refrigeration device 620 is lower, and at the same time, the fluid in the heat exchange pipe 601 installed on the refrigeration device 620 avoids heating the refrigeration device 620 to cause poor refrigeration effect and high energy consumption of the refrigeration device.

[0083] The valve core 840 is also assembled and fixed with the lock ring 844 through the connecting shaft 843, the lock ring 844 is assembled with one end of the telescopic shaft 821, the other end of the telescopic shaft 821 is sleeved with the first spring 861, penetrates out of the valve shell 810 and is assembled into the electromagnet 820, the electromagnet 820 is installed on the valve shell 810, and the electromagnet 820 can drive the telescopic shaft to axially expand after being started, so as to drive the valve core 840 to axially slide. The first spring 861 exerts a spring force on the valve core 840 to prevent the valve core 840 from moving to the electromagnet 820, so as to ensure that the second ring groove 842 is in communication with the second liquid inlet connector 803 and the second liquid outlet connector 804 and the first ring groove 841 is not in communication with the first liquid inlet connector 801 and the first liquid outlet connector 802 in the initial state.

[0084] The valve shell 810 is provided with a stop cavity 813 near one end of the electromagnet 820, the stop cavity 813 is installed with a stop ring 850 and a limiting ring 812, the stop ring 850 is installed with an elastic sheet 851, and the elastic sheet 851 is provided with a stop protrusion 852.

[0085] Referring to Figure 27 In the initial state, the valve core 840 is pressed against the end face of the inner cylinder 832, the outer cylinder 831 and the expansion ring 870 away from the electromagnet 820. When the heat absorber 610 is not used, as the temperature of the refrigerator 620 rises, once the boiling temperature of the liquid in the boiling cavity 691 is reached, the liquid will boil into gas and enter the expansion cavity 871 to make the expansion ring 870 expand. Due to the limitation of the inner cylinder 832 and the outer cylinder 831, the expansion ring 870 can only expand axially to push the valve core 840 to move upward and press the first spring 861, so as to gradually make the first ring groove 841 connect the first liquid inlet connector 801 and the first liquid outlet connector 802 to supply liquid to the heat absorber 610. At this time, the temperature of the heat absorber 610 is also absorbed and dissipated, so as to accelerate the temperature of the entire refrigerator 620 and heat absorber 610, and to accelerate the heat dissipation and refrigeration of the liquid circulating in the refrigerator 620 to the circulating pipe. At the same time, according to the temperature of the refrigerator 620, the expansion displacement of the expansion ring 870 changes dynamically, that is, the connection opening of the first liquid inlet connector 801 and the first liquid outlet connector 802, the second liquid inlet connector 803 and the second liquid outlet connector 804 is dynamically adjusted to realize automatic adjustment of the best heat dissipation mode.

[0086] When the thermoelectric refrigeration piece is needed to refrigerate the refrigerator, the industrial computer controls the thermoelectric refrigeration piece and the electromagnet 820 to start, the electromagnet 820 drives the telescopic shaft to contract and thus drives the valve core 840 to move up under the elastic force of the first spring 861 until the first liquid inlet joint 801 and the first liquid outlet joint 802 are completely connected, the second liquid inlet joint 803 and the second liquid outlet joint 804 are not connected, in the process, the locking ring 844 extrudes the stop protrusion 852 to make the stop protrusion 852 extrude the elastic sheet 851 to be elastically deformed and make the locking ring 844 pass through the stop protrusion 852, then the stop protrusion 852 resets under the action of the elastic sheet 851 to make the locking ring 844 and the stop protrusion 852 be pressed tightly and cannot reset, thereby keeping the current state. At this time, the liquid cooled by the radiator passes through the heat absorber 610 to cool the thermoelectric refrigeration piece, thereby ensuring the stable operation of the thermoelectric refrigeration piece. When resetting is needed, the electromagnet applies displacement to the telescopic shaft to move the end cover 830 to make the locking ring 844 extrude the stop protrusion 852 until the stop protrusion 852 is extruded and then passes through the stop protrusion 852, thereby completing the resetting and restoring the initial state. In the embodiment, the limiting ring 812 is used to limit the maximum displacement of the locking ring, to ensure that when the limiting ring 812 is tightly attached to the locking ring, the first liquid inlet joint 801 and the first liquid outlet joint 802 are completely connected, and the second liquid inlet joint 803 and the second liquid outlet joint 804 are not connected.

[0087] Referring to Figure 30 The use mode of the embodiment is roughly as follows:

[0088] When refrigeration is needed:

[0089] S1, the first pre-cooling reversing valve connects the circulating pump with the circulating pipe, the second pre-cooling reversing valve connects the circulating pipe with the uniform heating reversing valve, the uniform heating reversing valve is connected with the refrigeration pipe 621 of the electronic heat exchanger 300, the refrigeration pipe 621 is connected with the one-way valve, and the one-way valve is connected with the circulating pump, to form an independent refrigeration cycle, and the heat absorption pipe 611 is connected with the heat dissipation liquid (such as cold water) to dissipate heat. At the same time, the temperature of the refrigerator 620 is transmitted to the heat absorption block 690, and once the temperature of the heat absorption block 690 reaches the boiling temperature of the liquid in the boiling cavity 691, the expansion ring 870 is expanded to make the heat dissipated liquid enter the heat absorber to be absorbed, thereby increasing the refrigeration efficiency and quality of the refrigerator.

[0090] S2, at the same time, the compressor starts to drive the refrigerant to circulate between the condenser, the expansion valve, the evaporator and the compressor, so that the evaporator absorbs the heat in the inner tank 180. This is equivalent to two refrigeration cycles running simultaneously, so that the temperature in the inner tank 180 can be quickly reduced. Until the preset temperature is reached, the compressor cycle refrigeration or circulating pump refrigeration is selected according to the need of refrigeration, because the temperature of the compressor refrigeration is lower but the energy consumption is larger; the circulating pump refrigeration is fast and low in energy consumption, but the minimum temperature reached is high. Therefore, according to the actual need to maintain the temperature, the selection is conducive to energy saving and keeping the stability of the test conditions.

[0091] S3, if a lower refrigeration temperature is required, the first pre-cooling reversing valve can be controlled to communicate the circulating pump with the condenser, the second pre-cooling reversing valve can be controlled to communicate the condenser with the heat equalizing reversing valve, and the heat equalizing reversing valve can be controlled to communicate with the electronic heat exchanger. At this time, the circulation of the circulating pump is equivalent to a pre-cooling cycle, which is used to pre-cool the condenser to reduce the refrigeration temperature of the condenser to the refrigerant and increase the heat dissipation speed of the condenser. At this time, the temperature in the inner tank 180 can be greatly reduced through the evaporator. The solenoid is started to make the valve core reach Figure 29 state, and then the heat dissipation pump and the fan are started. The heat dissipation pump drives the heat dissipation liquid to circulate between the heat absorption pipe, the heat sink and the water supply valve, so as to quickly dissipate heat from the thermoelectric refrigeration piece.

[0092] S4, when the evaporator 200 is used to cool or maintain the temperature in the inner tank 180 alone, the temperature will gradually spread from the evaporator 200 to the entire inner tank 180. In order to ensure the uniformity of the temperature in the inner tank 180 and improve the test accuracy, the first pre-cooling reversing valve can be controlled to communicate the circulating pump with the circulating pipe, the second pre-cooling reversing valve can be controlled to communicate the circulating pipe with the heat equalizing reversing valve, and the heat equalizing reversing valve can be controlled to communicate with the circulating pump. The circulating pump is started to make the circulating pump carry the fluid to flow in the circulating pipe 650 to quickly and uniformly the temperature of the entire inner tank 180. The temperature is detected by the temperature sensor. When the temperature in the inner tank 180 reaches a uniform degree within the error range, the circulating pump can be stopped.

[0093] When heating is required:

[0094] S1, the electric heating wire is powered to generate heat, and the temperature sensor detects the temperature of multiple places in the inner tank 180.

[0095] S2, if it is found that the temperature difference of the inner tank 180 exceeds the preset threshold value (such as 2°C), the first pre-cooling reversing valve can be controlled to communicate the circulating pump with the circulating pipe, the second pre-cooling reversing valve can be controlled to communicate the circulating pipe with the heat equalizing reversing valve, and the heat equalizing reversing valve can be controlled to communicate with the circulating pump. The circulating pump is started to make the fluid circulate in the circulating pipe to quickly and uniformly the temperature in the inner tank 180. The fluid can be heat-conducting oil, and the fluid will not enter the electronic heat exchanger in the heating mode, so as to avoid overheating of the electronic heat exchanger and damage to the thermoelectric refrigeration piece 630.

[0096] The details of the application are not described in detail, which is the known technology of those skilled in the art.

[0097] The above describes the preferred embodiments of the application in detail. It should be understood that those skilled in the art can make many modifications and changes without creative labor according to the concept of the application. Therefore, any technical solutions obtained by logical analysis, reasoning or limited experiments on the basis of the prior art according to the concept of the application should be within the protection scope determined by the claims.

Claims

1. A windless constant temperature box, comprising an electronic heat exchanger, an inner box, and an outer box, wherein the inner box is installed in the outer box, and is characterized by: The gap between the inner box and the outer box is equipped with heating wire and circulation pipe; A plurality of temperature probes are installed on the inner box, and the temperature probes are connected to the temperature sensor, and the temperature sensor inputs the detected temperature signal into the industrial computer; an evaporator is installed in the inner box, and an evaporator tube is installed on the evaporator; The inlet end of the evaporator tube is connected to the outlet of the expansion valve, and the outlet end is connected to the inlet of the compressor. The outlet of the compressor is connected to the inlet of the condenser, and the outlet of the condenser is connected to the inlet of the expansion valve. A precooling pipe is installed in the condenser, the inlet end of the precooling pipe is connected to the second outlet of the first precooling reversing valve, the outlet end of the precooling pipe is connected to the second inlet of the second precooling reversing valve, the inlet of the first precooling reversing valve is connected to the outlet of the circulating pump, the first outlet of the first precooling reversing valve is connected to the inlet of the circulating pipe, the first precooling reversing valve is used to control its inlet to selectively connect with its first outlet and the second outlet; the second inlet of the second precooling reversing valve is connected to the outlet of the precooling pipe, the first inlet of the second precooling reversing valve is connected to the outlet of the circulating pipe, the outlet of the second precooling reversing valve is connected to the inlet of the heat equalizing reversing valve, and the outlet of the second precooling reversing valve is selectively connected with its first inlet and the second inlet; The first outlet of the heat equalizing reversing valve is connected to the inlet of the refrigeration pipe of the electronic heat exchanger, and the second outlet of the heat equalizing reversing valve is connected to the inlet of the circulation pump. The outlet of the refrigeration pipe is connected to the inlet of the one-way valve, and the outlet of the one-way valve is connected to the inlet of the circulation pump. The heat equalizing reversing valve is used to enable its inlet to selectively connect to the first outlet or the second outlet.

2. The windless constant temperature box according to claim 1, characterized in that: The machine also includes a frame and a door, wherein the electronic heat exchanger and the door are mounted on the frame, and an outer box and an inner box are mounted on the frame respectively; One side of the box door is hinged to the frame by a hinge, and the other side of the box door is locked to the frame by a box door lock. The box door is also provided with an observation window. A bracket is also installed in the frame, and an installation space is formed at the bracket. A mounting seat is installed in the installation space, and the inner side of the mounting seat is a mounting seat groove, and an electronic heat exchanger is clamped and installed in the mounting seat groove.

3. The windless constant temperature box according to claim 1, characterized in that: The heating wire and the circulation pipe are both attached to the outer wall of the inner box, and the space between the inner box and the outer box is filled with thermal insulation material; the heating wire is controlled to be on and off by a contactor, which is controlled by an industrial computer.

4. The windless thermostat according to claim 1, wherein: The evaporator includes an evaporator shell, a heat conducting plate, and an evaporator tube. The heat conducting plate is installed on the evaporator shell, and the evaporator shell is installed on the inner box. There are multiple heat conducting plates, and the evaporator tube is assembled and fixed to each plate.

5. The windless constant temperature box according to any one of claims 1 to 4, characterized in that: The electronic heat exchanger includes two heat exchange shells and two heat exchange seats. The two heat exchange seats are respectively installed in the corresponding heat exchange shells, and both heat exchange seats are provided with a mounting plate and a heat exchange seat groove. The mounting plate is installed on the corresponding heat exchange shell. One of the heat exchange seats is also provided with a liquid cavity connected to its heat exchange seat groove. A heat conductive film is installed on the heat exchange seat groove, and the heat conductive film seals the open end of the liquid cavity. The liquid chamber is also connected to the piston hole through a connecting groove. The piston hole is sealed and axially slidably assembled with the piston. The piston is installed on one end of the piston screw. The piston hole is provided on the corresponding heat exchange seat. The other end of the piston screw passes through the heat exchange seat and is screwed together with the heat exchange seat through a thread. The liquid chamber, connecting groove, and piston hole are filled with heat transfer oil. The piston squeezes the heat-conducting oil toward the liquid cavity so that the oil pressure in the liquid cavity increases, thereby pressing the heat-conducting film tightly against the corresponding hot seat.

6. The windless constant temperature box according to claim 5, characterized in that: The heat exchange seat grooves of the two heat exchange seats are interconnected to form an exchange slot, in which a cold seat and a hot seat are clamped and installed. The cold seat and the hot seat are respectively clamped and installed in the corresponding heat exchange seat grooves. A thermoelectric cooling plate is installed on the cold seat, and the cooling surface of the thermoelectric cooling plate is closely attached to the cold seat, and the heating surface is closely attached to the hot seat. A heat absorber is installed on the heat exchange seat assembled with the hot seat, and a heat absorption tube is installed in the heat absorber. The heat absorption tube introduces flowing heat dissipation liquid to dissipate heat from the heat exchange seat on which the hot seat is installed; a refrigerator is installed on the other heat exchange seat, and a cooling tube is installed on the refrigerator.

7. The windless constant temperature box according to claim 6, characterized in that: A boss is provided on the end surface of the hot seat facing the cold seat, and a cold seat groove and a mounting groove are provided on the end of the cold seat facing the hot seat. The cold seat groove and the mounting groove are connected to each other. A thermoelectric cooling plate is installed in the mounting groove, and the cooling surface of the thermoelectric cooling plate is tightly attached to the inner end surface of the mounting groove. The boss is inserted into the cold seat groove and is tightly attached to the heating surface of the thermoelectric cooling plate.

8. The windless constant temperature box according to claim 5, characterized in that: The thermoelectric cooling plate is electrically connected to one end of the wire, and the other end of the wire is electrically connected to the power supply through a relay or a contactor, and the relay or contactor is used to control the on and off of the current between the wire and the power supply; The second bolt passes through the two heat exchange seats and is tightened with the corresponding nuts to assemble and fix the two heat exchange seats; The two heat exchange shells are also provided with connecting ridges respectively. The first bolt passes through the connecting ridges of the two heat exchange shells and is tightened with the corresponding nut to assemble the two heat exchange shells, thereby achieving the assembly and fixation of the two heat exchange shells; a thermal insulation pad is also clamped between the two heat exchange shells.

9. The windless constant temperature box according to claim 6, characterized in that: The heat absorber and the refrigerator are both equipped with heat exchange tubes, which carry away the heat from the heat absorber and the refrigerator through the fluid flowing inside to achieve heat exchange and cooling. The installation method and structure of the heat exchange tubes are the same as those of the refrigerator tubes and the heat absorber tubes; One end of the heat exchange tube installed on the heat absorber is connected to the first liquid discharge joint of the liquid supply valve, and one end of the heat exchange tube installed on the refrigerator is connected to the second liquid discharge joint of the liquid supply valve; the first liquid inlet joint and the second liquid inlet joint of the liquid supply valve are respectively connected to the liquid outlet of the radiator, the liquid inlet of the radiator is connected to the outlet of the heat pump, and the inlet of the heat pump is respectively connected to the other end of the heat exchange tube installed on the heat absorber and the other end of the heat exchange tube installed on the refrigerator. The liquid supply valve is used to control the liquid supply flow to the heat exchange tube installed on the heat absorber and the heat exchange tube installed on the refrigerator; the radiator is directly opposite the fan, and the air flow blown by the fan passes through the radiator; A heat absorbing block is also installed between the refrigerator and the corresponding heat exchange seat. The heat absorbing block is made of a high thermal conductivity material and is provided with a boiling cavity inside. The boiling cavity is filled with liquid boiling at a certain temperature, and the boiling cavity is connected to one end of the heat conduction pipe. The heat conduction pipe is installed on the heat absorbing block, and the other end of the heat conduction pipe is connected to one end of the connecting pipe. The other end of the connecting pipe is connected to the expansion joint of the liquid supply valve.

10. The windless constant temperature box according to claim 9, characterized in that: The liquid supply valve includes a valve housing, an electromagnet, an end cover, and a valve core. A valve cavity is provided in the valve housing, and a valve core is sealed and slidably installed in the valve cavity. A first liquid inlet joint, a second liquid inlet joint, a first liquid discharge joint, a second liquid discharge joint, and an expansion joint are respectively installed on the valve housing. The first liquid inlet joint, the second liquid inlet joint, the first liquid discharge joint, and the second liquid discharge joint are all connected to the valve cavity. The expansion joint is connected to an expansion ring. The expansion ring is made of elastic material and has a sealed expansion cavity inside the expansion ring. The expansion cavity is connected to the expansion joint. The expansion ring is installed in the end cover cavity, which is arranged between the inner cylinder and the outer cylinder. The inner cylinder and the outer cylinder are both installed on the end cover. The end cover is installed on one end of the valve housing and closes one end of the valve cavity. A second spring is installed inside the inner cylinder, and the second spring applies an elastic force to the valve core to prevent it from moving toward the inner cylinder. The valve core is provided with a first annular groove and a second annular groove, respectively. When the refrigerator cools the fluid in the circulation pipe alone, the second annular groove is connected to the second liquid inlet joint and the second liquid outlet joint, and the first annular groove is not connected to the first liquid inlet joint and the first liquid outlet joint. At this time, the expansion ring does not expand and thus does not apply thrust to the valve core. When the thermoelectric cooling plate is started, the first annular groove is connected to the first liquid inlet joint and the first liquid outlet joint, and the second annular groove is not connected to the second liquid inlet joint and the second liquid outlet joint. The valve core is also fixed by a connecting shaft and a lock ring. The lock ring is assembled with one end of the telescopic shaft. The other end of the telescopic shaft is covered with a first spring, passes through the valve housing, and is installed in an electromagnet. The electromagnet is installed on the valve housing. A stop cavity is provided at one end of the valve housing close to the electromagnet. A stop ring and a limit ring are installed in the stop cavity. An elastic sheet is installed on the stop ring, and a stop protrusion is provided on the elastic sheet.

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