阅读说明：本技术 单列多级串联式双磁场磁制冷机及其热交换方法 (Single-row multistage tandem double-magnetic-field magnetic refrigerator and heat exchange method thereof ) 是由 李兆杰 黄焦宏 刘翠兰 张英德 程娟 金培育 王强 戴默涵 于 2020-12-31 设计创作，主要内容包括：本发明公开了一种单列多级串联式双磁场磁制冷机,包括：制冷仓、循环系统、换热系统；制冷仓包括：磁场系统、工质床；磁场系统包括：至少一对双磁场单体和磁工质,双磁场单体安装在制冷仓内,双磁场单体套装在工质床的外侧,磁工质固定在工质床内部；双磁场单体为二级磁场,包括：外磁轭钢筒、外磁体、内磁轭钢筒、内磁体；内磁轭钢筒或者外磁轭钢筒连接有电机和减速机；换热系统包括：换热器、蓄冷器,循环系统包括：隔膜水泵、第一电磁阀、第二电磁阀、第三电磁阀、第四电磁阀。本发明还公开了一种单列多级串联式双磁场磁制冷机的热交换方法。本发明实现了磁热效应最大化,大大提高了磁制冷工作效率。(The invention discloses a single-row multistage tandem type double-magnetic-field magnetic refrigerator, which comprises: a refrigeration bin, a circulating system and a heat exchange system; the refrigeration bin includes: a magnetic field system and a working medium bed; the magnetic field system comprises: the double-magnetic-field single body is arranged in the refrigerating bin, the double-magnetic-field single body is sleeved on the outer side of the working medium bed, and the magnetic working medium is fixed in the working medium bed; the double-magnetic-field single body is a secondary magnetic field and comprises: the magnetic flux sensor comprises an outer yoke steel cylinder, an outer magnet, an inner yoke steel cylinder and an inner magnet; the inner yoke steel cylinder or the outer yoke steel cylinder is connected with a motor and a speed reducer; the heat exchange system comprises: heat exchanger, regenerator, circulation system includes: the diaphragm pump, first solenoid valve, second solenoid valve, third solenoid valve, fourth solenoid valve. The invention also discloses a heat exchange method of the single-row multistage tandem type double-magnetic-field magnetic refrigerator. The invention realizes the maximization of the magnetocaloric effect and greatly improves the working efficiency of magnetic refrigeration.)

1. A single-row multistage tandem type double-magnetic-field magnetic refrigerator is characterized by comprising: a refrigeration bin, a circulating system and a heat exchange system; the refrigeration bin includes: a magnetic field system and a working medium bed; the magnetic field system comprises: the double-magnetic field single body is arranged in the refrigerating bin, and the double-magnetic field single body is sleeved on the outer side of the working medium bed; the working medium bed is of an airtight structure, and the magnetic working medium is fixed inside the working medium bed; the double-magnetic-field single body is a secondary magnetic field and comprises: the magnetic flux sensor comprises an outer yoke steel cylinder, an outer magnet, an inner yoke steel cylinder and an inner magnet; the outer magnet is fixed on the inner wall of the outer yoke steel cylinder, and the inner magnet is fixed on the inner wall of the inner yoke steel cylinder; the inner yoke steel cylinder is sleeved inside the outer yoke steel cylinder; the inner yoke steel cylinder is arranged on the first supporting seat, the outer yoke steel cylinder is arranged on the second supporting seat, the first supporting seat and the second supporting seat are fixed in the refrigerating bin, and the inner yoke steel cylinder or the outer yoke steel cylinder is connected with a motor and a speed reducer; the heat exchange system comprises: heat exchanger, regenerator, circulation system includes: the device comprises a diaphragm water pump, a first electromagnetic valve, a second electromagnetic valve, a third electromagnetic valve and a fourth electromagnetic valve; the first electromagnetic valve, the third electromagnetic valve and the diaphragm water pump are connected in series on the pipeline, and the second electromagnetic valve, the fourth electromagnetic valve and the diaphragm water pump are connected in series on the pipeline and are respectively connected in parallel between the heat exchanger and the regenerator; one end of the working medium bed is connected between the first electromagnetic valve and the third electromagnetic valve through a pipeline, and the other end of the working medium bed is connected between the second electromagnetic valve and the fourth electromagnetic valve through a pipeline.

2. The single-row multistage tandem type double-magnetic-field magnetic refrigerator according to claim 1, wherein flanges are welded to both ends of the working medium bed, filter screens are installed on the flanges, a support plate is connected to the outer side of the flanges, and the bottom of the support plate is fixed to the refrigerating bin.

3. The single-row multistage series double-magnetic-field magnetic refrigerator according to claim 1, wherein the magnetic medium is a rare earth metal wire or a rare earth metal alloy wire, and the diameter is 0.1mm to 1 mm; and a diode refrigerating sheet is arranged in the refrigerating bin.

4. The single-row multistage series double-magnetic-field magnetic refrigerator according to claim 1, wherein a diode refrigeration piece for controlling the initial temperature of the refrigeration bin is provided inside the refrigeration bin, and the diode refrigeration piece is provided with a temperature sensor; the heat exchanger and the regenerator are provided with film platinum resistors for recording temperature changes.

5. The single-row multistage series double-magnetic-field magnetic refrigerator according to claim 1, wherein a vacuum pressure gauge is arranged on the pipeline, the circulating system further comprises a programmable controller, and the motor, the vacuum pressure gauge, the first electromagnetic valve, the second electromagnetic valve, the third electromagnetic valve and the fourth electromagnetic valve are powered by an external power supply; the programmable controller is respectively connected with the motor, the vacuum pressure gauge, the diaphragm water pump, the first electromagnetic valve, the second electromagnetic valve, the third electromagnetic valve and the fourth electromagnetic valve through signal lines; the working medium bed, the pipeline, the heat exchanger and the cold accumulator are filled with heat exchange fluid, and a refrigeration box body is arranged outside the cold accumulator.

6. The heat exchange method of the single-row multistage tandem type double-magnetic-field magnetic refrigerator according to any one of claims 1 to 5, comprising:

the programmable controller starts the diaphragm water pump at one side of the regenerator, opens the first electromagnetic valve and the second electromagnetic valve, and closes the third electromagnetic valve and the fourth electromagnetic valve;

the programmable controller starts the motor to rotate, the motor and the reducer drive the inner yoke steel cylinder or the outer yoke steel cylinder to rotate, the magnetic medium is demagnetized, and the magnetic medium is cooled;

the magnetic working medium absorbs the heat of the heat exchange fluid in the working medium bed, and the cooled heat exchange fluid enters the cold accumulator to reduce the temperature of the cold accumulator and realize refrigeration;

the programmable controller starts the membrane water pump at one side of the heat exchanger, opens the third electromagnetic valve and the fourth electromagnetic valve, and closes the first electromagnetic valve and the second electromagnetic valve;

the programmable controller starts the motor to rotate, the motor and the speed reducer drive the inner yoke steel cylinder or the outer yoke steel cylinder to rotate, the magnetic medium is magnetized, and the temperature of the magnetic medium is raised;

the magnetic working medium heats the heat exchange fluid in the working medium bed, the heated heat exchange fluid enters the heat exchanger 31, the temperature of the regenerator is raised, and heating is realized.

7. The heat exchange method of a single-row multistage series double-magnetic-field magnetic refrigerator as claimed in claim 6, wherein the programmable controller controls the repeated magnetization and demagnetization of the working medium bed by controlling the relative position of the inner yoke steel cylinder or the outer yoke steel cylinder, and the magnetic working medium changes the temperature of the heat exchange fluid to realize continuous refrigeration and heating.

8. The heat exchanging method of a single-row multistage series double-magnetic-field magnetic refrigerator as claimed in claim 7, wherein the programmable controller controls the relative position of the inner yoke steel cylinder or the outer yoke steel cylinder by controlling the motor to rotate continuously or by controlling the motor to rotate in forward and reverse directions.

Technical Field

The invention relates to the field of room-temperature magnetic refrigeration, in particular to a single-row multistage tandem type double-magnetic-field magnetic refrigerator and a heat exchange method thereof.

Background

At present, the traditional compression refrigeration can cause damage to the ozone layer, and can indirectly cause the change of the living environment of human beings. Gas compression refrigeration uses a fluorine-free refrigerant, such as R410, according to the montreal protocol and the kyoto protocol. Although the new refrigerant no longer has an adverse effect on ozone, the new refrigerant can cause a greenhouse effect and still destroy the natural environment.

In the traditional compressed gas refrigeration, refrigerant is compressed by a compressor in an isentropic manner, then enters a condenser for cooling, enters a throttle valve, finally exits the throttle valve and enters an evaporator, and the refrigerant circularly works according to the principle that four parts of the whole thermodynamic cycle are completed when the refrigerant passes through different mechanical parts. The thermodynamic cycle of room temperature magnetic field refrigeration is completed in the heat accumulator, the refrigerant, namely the magnetic working medium, is not moved, and the thermodynamic cycle can be completed only by the change of the magnetic field intensity, so that the thermal fluid circulation system for magnetic field refrigeration greatly improves the refrigeration working efficiency.

However, the traditional magnetic refrigeration method has a complex mechanical structure, and the demagnetization of the magnetic working medium in the room-temperature magnetic field refrigeration is incomplete, so that the magnetocaloric effect is incomplete.

Disclosure of Invention

The invention aims to provide a single-row multistage tandem type double-magnetic-field magnetic refrigerator and a heat exchange method thereof, which realize the maximization of a magnetocaloric effect and greatly improve the working efficiency of magnetic refrigeration.

In order to achieve the purpose, the technical scheme adopted by the invention is as follows:

a single-train multistage tandem double-magnetic-field magnetic refrigerator comprising: a refrigeration bin, a circulating system and a heat exchange system; the refrigeration bin includes: a magnetic field system and a working medium bed; the magnetic field system comprises: the double-magnetic field single body is arranged in the refrigerating bin, and the double-magnetic field single body is sleeved on the outer side of the working medium bed; the working medium bed is of an airtight structure, and the magnetic working medium is fixed inside the working medium bed; the double-magnetic-field single body is a secondary magnetic field and comprises: the magnetic flux sensor comprises an outer yoke steel cylinder, an outer magnet, an inner yoke steel cylinder and an inner magnet; the outer magnet is fixed on the inner wall of the outer yoke steel cylinder, and the inner magnet is fixed on the inner wall of the inner yoke steel cylinder; the inner yoke steel cylinder is sleeved inside the outer yoke steel cylinder; the inner yoke steel cylinder is arranged on the first supporting seat, the outer yoke steel cylinder is arranged on the second supporting seat, the first supporting seat and the second supporting seat are fixed in the refrigerating bin, and the inner yoke steel cylinder or the outer yoke steel cylinder is connected with a motor and a speed reducer; the heat exchange system comprises: heat exchanger, regenerator, circulation system includes: the device comprises a diaphragm water pump, a first electromagnetic valve, a second electromagnetic valve, a third electromagnetic valve and a fourth electromagnetic valve; the first electromagnetic valve, the third electromagnetic valve and the diaphragm water pump are connected in series on the pipeline, and the second electromagnetic valve, the fourth electromagnetic valve and the diaphragm water pump are connected in series on the pipeline and are respectively connected in parallel between the heat exchanger and the regenerator; one end of the working medium bed is connected between the first electromagnetic valve and the third electromagnetic valve through a pipeline, and the other end of the working medium bed is connected between the second electromagnetic valve and the fourth electromagnetic valve through a pipeline.

Furthermore, flanges are welded at two ends of the working medium bed, the filter screen is installed on the flanges, a supporting plate is connected to the outer side of the flanges, and the bottom of the supporting plate is fixed to the refrigerating bin.

Furthermore, the magnetic working medium is a rare earth metal wire or a rare earth metal alloy wire, and the diameter of the magnetic working medium is 0.1mm-1 mm; and a diode refrigerating sheet is arranged in the refrigerating bin.

Further, a diode refrigeration piece for controlling the initial temperature of the refrigeration bin is arranged in the refrigeration bin, and the diode refrigeration piece is provided with a temperature sensor; the heat exchanger and the regenerator are provided with film platinum resistors for recording temperature changes.

Furthermore, a vacuum pressure gauge is arranged on the pipeline, the circulating system also comprises a programmable controller, and the motor, the vacuum pressure gauge, the first electromagnetic valve, the second electromagnetic valve, the third electromagnetic valve and the fourth electromagnetic valve are powered by an external power supply; the programmable controller is respectively connected with the motor, the vacuum pressure gauge, the diaphragm water pump, the first electromagnetic valve, the second electromagnetic valve, the third electromagnetic valve and the fourth electromagnetic valve through signal lines; the working medium bed, the pipeline, the heat exchanger and the cold accumulator are filled with heat exchange fluid, and a refrigeration box body is arranged outside the cold accumulator.

The heat exchange method for the single-row multistage series double-magnetic-field magnetic refrigerator comprises the following steps:

the programmable controller starts the diaphragm water pump at one side of the regenerator, opens the first electromagnetic valve and the second electromagnetic valve, and closes the third electromagnetic valve and the fourth electromagnetic valve;

the programmable controller starts the motor to rotate, the motor and the reducer drive the inner yoke steel cylinder or the outer yoke steel cylinder to rotate, the magnetic medium is demagnetized, and the magnetic medium is cooled;

the magnetic working medium absorbs the heat of the heat exchange fluid in the working medium bed, and the cooled heat exchange fluid enters the cold accumulator to reduce the temperature of the cold accumulator and realize refrigeration;

the programmable controller starts the membrane water pump at one side of the heat exchanger, opens the third electromagnetic valve and the fourth electromagnetic valve, and closes the first electromagnetic valve and the second electromagnetic valve;

the programmable controller starts the motor to rotate, the motor and the speed reducer drive the inner yoke steel cylinder or the outer yoke steel cylinder to rotate, the magnetic medium is magnetized, and the temperature of the magnetic medium is raised;

the magnetic working medium heats the heat exchange fluid in the working medium bed, the heated heat exchange fluid enters the heat exchanger 31, the temperature of the regenerator is raised, and heating is realized.

Preferably, the programmable controller controls the working medium bed to be repeatedly magnetized and demagnetized by controlling the relative position of the inner yoke steel cylinder or the outer yoke steel cylinder, and the magnetic working medium changes the temperature of the heat exchange fluid to realize continuous refrigeration and heating.

Preferably, the programmable controller controls the relative position of the inner yoke steel cylinder or the outer yoke steel cylinder by controlling the motor to rotate continuously or controlling the motor to rotate in the forward direction and the reverse direction.

The invention has the technical effects that:

1. the single-row multistage tandem type double-magnetic-field magnetic refrigerator provided by the invention can completely magnetize and demagnetize the magnetic working medium, improve the utilization rate of the magnetic heating effect of the magnetic working medium, realize the maximization of the magnetic heating effect and greatly improve the working efficiency of magnetic refrigeration.

2. In the traditional compressor refrigeration, a refrigerant is compressed by the compressor in an isentropic manner, then enters a condenser for cooling, enters a throttle valve, finally exits the throttle valve, enters an evaporator, and works according to the cycle, and four parts of the whole thermodynamic cycle are completed when the refrigerant passes through different mechanical parts. In the invention, the thermodynamic cycle of the magnetic refrigerator is completed in the refrigerating bin and the heat exchange system, and the thermodynamic cycle can be completed through the change of the magnetic field intensity, thereby greatly improving the refrigerating work efficiency.

Drawings

FIG. 1 is a schematic diagram of a single-row multistage tandem type double-magnetic-field magnetic refrigerator according to the present invention;

FIG. 2 is a schematic structural diagram of a dual field unit according to the present invention;

FIG. 3 is a schematic diagram of a single-train multi-stage tandem-type dual-field magnetic refrigerator according to the present invention;

fig. 4 is a schematic diagram of three magnetic field units arranged outside the magnetic field system of the present invention.

Detailed Description

The following description sufficiently illustrates specific embodiments of the invention to enable those skilled in the art to practice and reproduce it.

Fig. 1 is a schematic diagram of a single-row multistage tandem type double-magnetic-field magnetic refrigerator according to the present invention. Fig. 2 is a schematic structural diagram of the dual-field single body according to the present invention.

A single-train multistage tandem double-magnetic-field magnetic refrigerator comprising: a refrigeration bin 1, a circulating system 2 and a heat exchange system; the refrigeration bin 1 changes the temperature of the magnetic working medium by using a magnetocaloric effect and transmits the cold energy or the heat energy generated by the magnetic working medium to the heat exchange fluid; the circulating system 2 is connected with the heat exchange system through a pipeline and is used for conveying heat exchange fluid to the heat exchange system; the heat exchange system is used for exchanging cold or heat brought out by the heat exchange fluid.

(1) The refrigerating compartment 1 comprises: magnetic field system 11, working medium bed 12, diode refrigeration piece 17.

The magnetic field system 11 comprises: a plurality of pairs of double-magnetic field single bodies and magnetic working media 16, wherein the double-magnetic field single bodies are sleeved on the outer side of the same working medium bed 12. The double-magnetic field single body is arranged in the refrigerating bin 1.

The double-magnetic-field single body is a secondary magnetic field and comprises: an outer yoke steel cylinder 111, an outer magnet 112, an inner yoke steel cylinder 113 and an inner magnet 114; the outer magnet 112 is fixed on the inner wall of the outer yoke steel cylinder 111, and the inner magnet 114 is fixed on the inner wall of the inner yoke steel cylinder 113; the inner yoke steel cylinder 113 is sleeved inside the outer yoke steel cylinder 111. The inner yoke steel cylinder 113 is installed on a first supporting seat, the outer yoke steel cylinder 111 is installed on a second supporting seat, the first supporting seat and the second supporting seat are fixed in the refrigerating bin 1, and the inner yoke steel cylinder 113 or the outer yoke steel cylinder 111 is connected with a motor and a speed reducer. The motor is powered by an external power supply.

The working medium bed 12 is of a closed structure and is connected with the circulating system 2 through a pipeline, flanges 14 are welded at two ends of the working medium bed, and a filter screen is installed on each flange 14; the outer side of the flange 14 is connected with a supporting plate 15, and the bottom of the supporting plate 15 is fixed on the refrigerating bin 1. The magnetic working medium 16 is fixed inside the working medium bed 12.

The motor drives the speed reducer to rotate, the speed reducer drives the inner yoke steel cylinder 113 to rotate, the magnetic fluxes of the outer magnet 112 and the inner magnet 114 are overlapped, the magnetic flux of the double-magnetic-field single body is changed, and the magnetic flux changes from the lowest magnetic field to the highest magnetic field.

When the magnetic working medium 16 is in the lowest magnetic field, the magnetic working medium (magnetic material) 16 is demagnetized, and the magnetic working medium 16 is cooled; when the magnetic working medium 16 is in the highest magnetic field, the magnetic working medium 16 is magnetized, the magnetic entropy is reduced, the lattice entropy is increased, the atom activity is aggravated, and the temperature of the magnetic material is increased. The magnetic working medium 16 is made of rare earth metal gadolinium wires with the diameter of 0.1mm-1mm, the gadolinium component accounts for more than 99%, and gadolinium terbium and gadolinium erbium alloy wires with the diameter of 0.1mm-1mm can be assembled in sections.

The diode refrigeration piece 17 is used for controlling the initial temperature of the refrigeration bin 1, is provided with a temperature sensor, and starts refrigeration when the temperature inside the refrigeration bin 1 reaches 20 ℃, so that the magnetocaloric effect of the magnetic working medium 16 is protected.

FIG. 3 is a schematic diagram of a circulation system of a single-row multistage tandem type double-magnetic-field magnetic refrigerator according to the present invention.

(2) The circulation system 2 includes: a programmable controller, a vacuum pressure gauge 21, a diaphragm water pump 22, a first electromagnetic valve 23, a second electromagnetic valve 24, a third electromagnetic valve 25 and a fourth electromagnetic valve 26; the vacuum pressure gauge 21, the first electromagnetic valve 23, the second electromagnetic valve 24, the third electromagnetic valve 25 and the fourth electromagnetic valve 26 are sequentially arranged on a pipeline and are powered by an external power supply.

The first electromagnetic valve 23, the third electromagnetic valve 25 and the diaphragm water pump 22 are connected in series on the pipeline, and the second electromagnetic valve 24, the fourth electromagnetic valve 26 and the diaphragm water pump 22 are connected in series on the pipeline and are respectively connected in parallel between the heat exchanger 31 and the regenerator 32; one end of the working medium bed 12 is connected between the first electromagnetic valve 23 and the third electromagnetic valve 25 through a pipeline, and the other end is connected between the second electromagnetic valve 24 and the fourth electromagnetic valve 26 through a pipeline.

The programmable controller is respectively connected with the motor, the vacuum pressure gauge 21, the diaphragm water pump 22, the first electromagnetic valve 23, the second electromagnetic valve 24, the third electromagnetic valve 25 and the fourth electromagnetic valve 26 through signal lines and is used for controlling the start and stop of the structure. The programmable controller controls the rotation direction and the action frequency of the motor at the same time so as to control the time when the magnetic working medium 16 enters or exits the magnetic field.

The working medium bed 12, the pipeline, the heat exchanger 31 and the cold accumulator 32 are filled with heat exchange fluid, and the main component of the heat exchange fluid is H₂O, a small amount of alcohol may be added. The first electromagnetic valve 23, the second electromagnetic valve 24, the third electromagnetic valve 25 and the fourth electromagnetic valve 26 are direct-conduction electromagnetic valves, and the circulation of the heat exchange fluid is controlled by the four direct-conduction electromagnetic valves. When the magnetic working medium 16 heats, the third electromagnetic valve 25 and the fourth electromagnetic valve 26 are opened, and the first electromagnetic valve 23 and the second electromagnetic valve 24 are closed; when the magnetic working medium 16 is refrigerated, the first electromagnetic valve 23 and the second electromagnetic valve 24 are opened, and the third electromagnetic valve 25 and the fourth electromagnetic valve 26 are closed.

The vacuum pressure gauge 21 is used for measuring the pressure of the heat exchange circulation system 2.

The diaphragm water pump 22 is used as a power source of the heat exchange fluid to provide power for the cold and hot circulation.

(3) And the heat exchange system 3 comprises: a heat exchanger 31 and a regenerator 32, wherein the heat exchanger 31 is connected to the pipeline between the third electromagnetic valve 25 and the fourth electromagnetic valve 26, and the regenerator 32 is connected to the pipeline between the first electromagnetic valve 23 and the second electromagnetic valve 24.

The heat exchanger 31 and the regenerator 32 are provided with thin film platinum resistors for recording temperature changes. A refrigeration case 33 is provided outside the regenerator 32.

As shown in FIG. 4, it is a schematic diagram of the present invention in which three double-magnetic-field single bodies are disposed outside the working medium bed 12.

At least one double-magnetic-field single body is arranged outside the working medium bed 12, and in the preferred embodiment, three double-magnetic-field single bodies are arranged outside the working medium bed 12.

The heat exchange method of single-row multistage series double-magnetic-field magnetic refrigerator includes the following steps:

step 1: the programmable controller starts the diaphragm water pump 22 at one side of the cold accumulator 32, opens the first electromagnetic valve 23 and the second electromagnetic valve 24, and closes the third electromagnetic valve 25 and the fourth electromagnetic valve 26;

step 2: the programmable controller starts the motor to rotate in the forward direction, the motor and the speed reducer drive the inner yoke steel cylinder 113 or the outer yoke steel cylinder 111 to rotate in the forward direction, the magnetic medium 16 is demagnetized, and the magnetic medium 16 is cooled;

the magnetization or demagnetization is realized by the superposition of the magnetic fields of the outer magnet 112 and the inner magnet 114 or by changing the position of the magnetic field of the magnetic medium 16.

And step 3: the magnetic working medium 16 absorbs the heat of the heat exchange fluid in the working medium bed 12, the cooled heat exchange fluid enters the cold accumulator 32, the temperature of the cold accumulator 32 is reduced, and refrigeration is realized;

and 4, step 4: the programmable controller starts the membrane water pump 22 at one side of the heat exchanger 31, opens the third electromagnetic valve 25 and the fourth electromagnetic valve 26, and closes the first electromagnetic valve 23 and the second electromagnetic valve 24;

and 5: the programmable controller starts the motor to rotate reversely, the motor and the reducer drive the inner yoke steel cylinder 113 or the outer yoke steel cylinder 111 to rotate reversely, the magnetic working medium 16 is magnetized, and the temperature of the magnetic working medium 16 is increased;

step 6: the magnetic working medium 16 heats the heat exchange fluid in the working medium bed 12, the heated heat exchange fluid enters the heat exchanger 31, and the temperature of the cold accumulator 32 is raised, so that heating is realized;

and 7: the programmable controller controls the working medium bed 12 to repeatedly magnetize and demagnetize by controlling the relative position of the inner yoke steel cylinder 113 or the outer yoke steel cylinder 111, and the magnetic working medium 16 changes the temperature of the heat exchange fluid to realize continuous refrigeration and heating.

The start and stop of the diaphragm water pump 22 and the on-off time of the electromagnetic valves (the first electromagnetic valve 23, the second electromagnetic valve 24, the third electromagnetic valve 25 and the fourth electromagnetic valve 26) are controlled by the programmable controller, the heat exchange fluid is driven by the diaphragm pump 22 to flow into the heat exchanger 31 at the hot end and the cold accumulator 32 at the cold end, and the temperatures of the heat exchanger 31 and the cold accumulator 32 are measured by the thin film platinum resistor, so that the refrigeration and the heating are realized.

The terminology used herein is for the purpose of description and illustration, rather than of limitation. As the present invention may be embodied in several forms without departing from the spirit or essential characteristics thereof, it should also be understood that the above-described embodiments are not limited by any of the details of the foregoing description, but rather should be construed broadly within its spirit and scope as defined in the appended claims, and therefore all changes and modifications that fall within the meets and bounds of the claims, or equivalences of such meets and bounds are therefore intended to be embraced by the appended claims.