Magnetic suspension air refrigeration device

Abstract

The magnetic suspension air refrigeration device comprises a compressor, an expansion machine and a heat exchanger, the compressor and the expansion machine are coaxially connected to form a compression and expansion all-in-one machine, the inlet end of the compressor is used for being communicated with a refrigeration unit, and the outlet end of the compressor, the heat exchanger and the inlet end of the expansion machine are sequentially communicated; the outlet end of the expansion machine is used for communicating with a cooling unit. According to the magnetic suspension air refrigeration device, natural working medium air serves as a refrigerant, the magnetic suspension compression and expansion all-in-one machine serves as a power source, energy is saved, environment is protected, cost is saved, expansion work output by the expansion machine acts on the compressor, and therefore overall power consumption is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of refrigeration devices, and more specifically to a magnetic suspension air refrigeration device. Background Art

[0002] Existing refrigeration devices are usually composed of a compressor, a condenser, a throttle valve, and an evaporator connected in sequence through pipelines. The compressor discharges high-temperature and high-pressure refrigerant, which enters the condenser to release heat and become medium-temperature and high-pressure refrigerant, and then passes through the throttle valve to reduce the pressure to low-temperature and low-pressure refrigerant and enter the evaporator. After the refrigerant evaporates, the cold energy is transferred to the cooling place through the evaporator heat exchange, and the refrigerant is sucked into the compressor again, thus completing the refrigeration cycle.

[0003] Therefore, existing refrigeration devices use phase-changeable refrigerants as refrigerants, such as CFCs and HCFCs, which not only have high refrigeration costs but also pollute the environment.

[0004] Under the promotion of environmental protection and energy conservation strategies, the first generation of refrigerants (CFCs) are gradually replaced, the second generation of refrigerants (HCFCs) and the third generation of refrigerants (HFCs) are restricted and replaced, and natural refrigerants are once again valued. Moreover, magnetic levitation technology belongs to the high-tech industry, which is energy-saving, efficient and green.

[0005] In summary, how to develop new fourth-generation refrigerants, improve the energy-saving efficiency of refrigeration systems, and explore new refrigeration methods are issues that urgently need to be solved by technical personnel in this field. Summary of the invention

[0006] In view of this, the purpose of the present invention is to provide a magnetic levitation air refrigeration device, which uses natural working fluid air as a refrigerant and a magnetic levitation compression and expansion integrated machine as a power source, so as to save energy, protect the environment, save costs, and use the expansion work output by the expander to act on the compressor to reduce overall power consumption.

[0007] In order to achieve the above object, the present invention provides the following technical solutions:

[0008] A magnetic levitation air refrigeration device comprises a compressor, an expander and a heat exchanger, wherein the compressor and the expander are coaxially connected to form a compression-expansion integrated machine, and the inlet end of the compressor is used to connect to a common refrigeration unit, the outlet end of the compressor, the heat exchanger and the inlet end of the expander are connected in sequence, and the outlet end of the expander is used to connect to the refrigeration unit.

[0009] Preferably, the compressor is a magnetic levitation compressor, the expander is a magnetic levitation expander, and the rotor of the magnetic levitation compressor and the rotor of the magnetic levitation expander are connected as a whole via a rotating shaft.

[0010] Preferably, the heat exchanger is a plate-fin heat exchanger, and a fan is provided on one side of the heat exchanger.

[0011] Preferably, a flow guide cover is provided on the outer periphery of the heat exchanger, and the fan is arranged at a cover opening of the flow guide cover.

[0012] Preferably, the integrated compression and expansion machine is arranged on a first support, the heat exchanger is arranged on a second support, and the inlet end of the heat exchanger is higher than the outlet end of the compressor, and the outlet end of the heat exchanger is lower than the inlet end of the expander.

[0013] Preferably, the outlet end of the compressor is connected to the inlet end of the heat exchanger through a first pipeline, the outlet end of the heat exchanger is connected to the inlet end of the expander through a second pipeline, and the first pipeline and the second pipeline are extended in the same direction.

[0014] Preferably, the integrated compression-expansion machine is arranged in a first housing, and the heat exchanger is arranged in a second housing;

[0015] Two opposite shell walls of the first shell and the second shell are both provided with a first through hole for the first pipeline to pass through and a second through hole for the second pipeline to pass through;

[0016] An intake pipe and an exhaust pipe are also provided on the shell wall of the first shell. The intake pipe is connected between the refrigeration unit and the inlet end of the compressor, and the exhaust pipe is connected between the outlet end of the expander and the refrigeration unit.

[0017] Preferably, it also includes a first temperature detection device, which is used to be installed in the refrigeration unit, and the first temperature detection device and the compressor electrical signal are connected to a control system, and the control system is used to obtain the temperature detected by the first temperature detection device and control the speed of the compressor.

[0018] Preferably, the outlet end of the expander is connected to a common refrigeration unit through an exhaust pipe, a second temperature detection device is provided on the exhaust pipe, and the electrical signal of the second temperature detection device is connected to the control system, and the control system is used to obtain the temperature detected by the second temperature detection device and control the speed of the compressor.

[0019] Preferably, a pressure detection device is also provided on the exhaust pipe, and the electrical signal of the pressure detection device is connected to the control system. The control system is used to obtain the pressure detected by the pressure detection device and control the rotation speed of the compressor.

[0020] When the magnetic levitation air refrigeration device provided by the present invention is used for refrigeration, the air in the environment of the cooling unit is sucked into the compressor, the compressor compresses the air into high-temperature and high-pressure air, the high-temperature and high-pressure air enters the heat exchanger for heat exchange to become medium-temperature and high-pressure air, the medium-temperature and high-pressure air then enters the expander for expansion and pressure reduction to become low-temperature and low-pressure air, at the same time, the work done by the gas to the outside during the expansion process (that is, the output work of the expander) is transferred to the compressor through the shaft as the input work of the compressor, and then the low-temperature and low-pressure air enters the cooling unit to cool the cooling unit.

[0021] Therefore, the present invention has the following beneficial effects:

[0022] (1) Using natural air as the refrigerant. Compared with traditional refrigerants, air does not produce a greenhouse effect and is easy to obtain, which is energy-saving, environmentally friendly and cost-saving.

[0023] (2) By using a coaxially connected compressor and expander as the power source, the expansion work output by the expander can be applied to the compressor. Under the same cooling capacity, the overall power consumption is lower. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0025] Figure 1 This is a schematic diagram of the structure of the magnetic suspension air refrigeration device provided by the present invention;

[0026] Figure 2 This is an air flow path diagram of the magnetic suspension air refrigeration device provided by the present invention.

[0027] Reference numerals:

[0028] 1-cold unit; 2-compression expansion machine; 21-compressor; 22-expander; 3-heat exchanger; 4-fan; 5-rotating shaft; 6-intake pipe; 7-first pipeline; 8-second pipeline; 9-exhaust pipe; 10-first support; 11-second support; 12-second temperature detection device; 13-pressure detection device. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] The core of the present invention is to provide a magnetic levitation air refrigeration device, which uses natural working fluid air as a refrigerant to save energy and protect the environment, and uses the expansion work output by the expander to act on the compressor to improve the refrigeration efficiency and reduce the overall power consumption.

[0031] Please refer to Figure 1 and Figure 2 The present invention provides a magnetic levitation air refrigeration device, including a compressor 21, an expander 22 and a heat exchanger 3. The compressor 21 and the expander 22 are coaxially connected to form a compression-expansion integrated machine 2, and the inlet end of the compressor 21 is used to connect to the common refrigeration unit 1, the outlet end of the compressor 21, the heat exchanger 3 and the inlet end of the expander 22 are connected in sequence, and the outlet end of the expander 22 is used to connect to the common refrigeration unit 1.

[0032] It should be noted that the function of the compressor 21 is to compress low-temperature and low-pressure gas into high-temperature and high-pressure gas. The function of the expander 22 is to utilize the compressed gas to expand and reduce pressure to output mechanical work to the outside, so as to reduce the gas temperature to obtain cooling capacity, thereby achieving the purpose of reducing pressure and temperature. In addition, the cold unit 1 refers to the indoor space or equipment of the building that needs to be refrigerated and cooled.

[0033] Specifically, the compressor 21 and the expander 22 are coaxially connected to form a compression-expansion integrated machine 2, that is, the impeller of the compressor 21 and the impeller of the expander 22 are coaxially connected, so that the mechanical work output by the expander 22 when the compressed gas is expanded and reduced can be transmitted to the compressor 21, so as to drive the compressor 21 to operate as the input work of the compressor 21. The inlet end of the compressor 21 is connected to the common refrigeration unit 1 through the suction pipe 6, the outlet end of the compressor 21 is connected to the inlet end of the heat exchanger 3 through the first pipeline 7, the outlet end of the heat exchanger 3 is connected to the inlet end of the expander 22 through the second pipeline 8, and the outlet end of the expander 22 is connected to the common refrigeration unit 1 through the exhaust pipe 9, thereby forming a refrigeration cycle.

[0034] When the above-mentioned magnetic levitation air refrigeration device is used for refrigeration, the air in the environment of the cooling unit 1 is sucked into the compressor 21, and the compressor 21 compresses the air into high-temperature and high-pressure air. The high-temperature and high-pressure air enters the heat exchanger 3 for heat exchange and becomes medium-temperature and high-pressure air. The medium-temperature and high-pressure air then enters the expander 22 for expansion and pressure reduction to become low-temperature and low-pressure air. At the same time, the work done by the gas to the outside during the expansion process (that is, the output work of the expander 22) is transferred to the compressor 21 through the shaft as the input work of the compressor 21, and then the low-temperature and low-pressure air enters the cooling unit 1 to cool the cooling unit 1.

[0035] Therefore, the present invention has the following beneficial effects: First, natural working fluid air is used as the refrigerant. Compared with traditional refrigerants, air does not produce a greenhouse effect and is easy to obtain, thereby saving energy, protecting the environment and saving costs; Second, a coaxially connected compressor 21 and expander 22 are used as power sources, and the expansion work output by the expander 22 can be applied to the compressor 21. Under the same cooling capacity, the overall power consumption is lower.

[0036] On the basis of the above embodiment, the compressor 21 is a magnetic levitation compressor 21 , the expander 22 is a magnetic levitation expander 22 , and the rotor of the magnetic levitation compressor 21 and the rotor of the magnetic levitation expander 22 are connected as a whole through a rotating shaft 5 .

[0037] Therefore, the magnetic levitation compressor 21 and the magnetic levitation expander 22 both adopt the magnetic levitation bearing technology, which eliminates mechanical contact and friction and has high transmission efficiency, thereby not only saving energy consumption but also improving refrigeration efficiency. It should be noted that the specific structure of the magnetic levitation compressor 21 and the magnetic levitation expander 22 is not the focus of protection of the present invention, and reference may be made to the prior art, and will not be described in detail here.

[0038] In one embodiment, the heat exchanger 3 is a plate-fin heat exchanger, and a fan 4 is provided on one side of the plate-fin heat exchanger.

[0039] It should be noted that a plate-fin heat exchanger is usually composed of multiple fin groups arranged at equal intervals. The gaps between the fin groups form a heat exchange channel, so that the high-temperature air flowing into the fin group and the air in the environment can exchange heat by convection to achieve air cooling. In addition, the plate-fin heat exchanger can meet the situation where both sides of the heat exchange are air and the cold side is negative pressure, and the sealing condition is good.

[0040] Therefore, the fan 4 is arranged on one side of the plate-fin heat exchanger, which can increase the air in the environment to flow through the gap between the fin groups, so as to increase the contact area between the air in the environment and the fin group, thereby accelerating the heat exchange process between the air in the environment and the high-temperature air in the fin group, thereby enhancing the cooling effect of the plate-fin heat exchanger, and then under the same cooling capacity, the speed of the compressor 21 or the air intake amount can be reduced to further reduce the overall power consumption. In addition, the use of a plate-fin heat exchanger as the heat exchanger 3 saves water cooling pipes and the setting of a cooling water group compared to a water-cooled heat exchanger, so that it is more adaptable.

[0041] Preferably, a shroud is provided around the outer periphery of the heat exchanger 3, and the fan 4 is provided at the shroud opening of the shroud. Thus, the air in the environment can only enter from the shroud opening under the action of the suction force of the fan 4, so that the air and the fin group of the heat exchanger 3 are fully in contact with each other for heat exchange, thereby further improving the heat exchange effect of the heat exchanger 3.

[0042] Based on the above examples, please refer to Figure 1 The compression-expansion integrated machine 2 is arranged on the first support 10, the heat exchanger 3 is arranged on the second support 11, and the inlet end of the heat exchanger 3 is higher than the outlet end of the compressor 21, and the outlet end of the heat exchanger 3 is lower than the inlet end of the expander 22.

[0043] Thus, the first support 10 can stably support the compression-expansion integrated machine 2, and the second support 11 can stably support the heat exchanger 3, thereby improving the structural stability of the refrigeration device. At the same time, the inlet end of the heat exchanger 3 is higher than the outlet end of the compressor 21, which facilitates the high-temperature and high-pressure air discharged from the compressor 21 to rise and diffuse into the heat exchanger 3 for heat exchange, and the outlet end of the heat exchanger 3 is lower than the inlet end of the expander 22, which facilitates the medium-temperature and high-pressure air after heat exchange to rise and diffuse into the inlet end of the expander 22, thereby improving the air flow efficiency, and further improving the refrigeration efficiency.

[0044] Based on the above examples, please refer to Figure 1 The outlet of the compressor 21 is connected to the inlet of the heat exchanger 3 through the first pipeline 7, and the outlet of the heat exchanger 3 is connected to the inlet of the expander 22 through the second pipeline 8, and the first pipeline 7 and the second pipeline 8 are extended in the same direction.

[0045] Therefore, the first pipeline 7 and the second pipeline 8 are relatively placed between the compression and expansion machine 2 and the heat exchanger 3, and the two are approximately parallel to simplify the overall pipeline structure, reduce the resistance of air flow, and further improve the refrigeration efficiency.

[0046] On the basis of the above embodiment, the integrated compression and expansion machine 2 is arranged in the first shell, and the heat exchanger 3 is arranged in the second shell.

[0047] Thus, the first shell can protect the integrated compression and expansion machine 2, and the second shell can protect the heat exchanger 3, which is beneficial to ensure the normal operation of the integrated compression and expansion machine 2 and the heat exchanger 3, and further ensure that the refrigeration device can reliably perform refrigeration operations.

[0048] It should be noted that the two opposite shell walls of the first shell and the second shell are both provided with a first through-hole for the first pipeline 7 to pass through and a second through-hole for the second pipeline 8 to pass through. In this way, one end of the first pipeline 7 is connected to the outlet end of the compressor 21, and the other end is connected to the inlet end of the heat exchanger 3 through the first through-hole, and one end of the second pipeline 8 is connected to the outlet end of the heat exchanger 3, and the other end is connected to the inlet end of the expander 22 through the second through-hole, so as to realize the connection between the compression-expansion integrated machine 2 and the heat exchanger 3. In addition, an air intake pipe 6 connecting the refrigeration unit 1 and the inlet end of the compressor 21 is passed through the shell wall on one side of the first shell, so as to realize the compressor 21 to inhale the air in the refrigeration unit 1, and an exhaust pipe 9 connecting the outlet end of the expander 22 and the refrigeration unit 1 is passed through the shell wall on the other side of the first shell, so as to realize the expander 22 to discharge the cooled air into the refrigeration unit 1.

[0049] On the basis of the above embodiments, the present invention also includes a first temperature detection device, which is used to be installed in the cooling unit 1, and the first temperature detection device and the compressor 21 are electrically connected to the control system, and the control system is used to obtain the temperature detected by the first temperature detection device and control the speed of the compressor 21.

[0050] Thus, the first temperature detection device detects the real-time temperature of the cooling unit 1 and transmits it to the control system. The control system compares the real-time temperature of the cooling unit 1 with the preset maximum temperature. If the real-time temperature of the cooling unit 1 exceeds the preset maximum temperature, it means that the temperature of the cooling unit 1 is too high and does not meet the requirements. The control system controls the start of the compressor 21 and the expansion machine 22, and controls the speed of the compressor 21. If the real-time temperature of the cooling unit 1 is lower than the preset maximum temperature, it means that the temperature of the cooling unit 1 is reduced to a temperature range that meets the requirements, and the control system controls the compressor 21 and the expansion machine 22 to stop. Therefore, the first temperature detection device connected to the control system by electrical signals can maintain the temperature of the cooling unit within a suitable temperature range, thereby effectively improving the cooling effect and reliability of the refrigeration device, and thus improving the comfort of indoor users.

[0051] Please note that, please refer to Figure 2 The compressor 21 and the expander 22 are connected as a whole through a rotating shaft 5. A motor is connected to the end of the rotating shaft 5. The motor serves as a power source for driving the compression and expansion machine 2. The control system can control the speed of the compressor 21 and the expander 22 by controlling the speed of the motor.

[0052] For further information, please refer to Figure 1A second temperature detection device 12 is provided on the exhaust pipe 9 , and the second temperature detection device 12 is electrically connected to the control system. The control system is used to obtain the temperature detected by the second temperature detection device 12 and control the rotation speed of the compressor 21 .

[0053] Therefore, the second temperature detection device 12 is used to detect the real-time temperature after the expansion machine 22 is cooled (that is, the temperature of the air discharged from the refrigeration device into the cold unit 1), and transmit it to the control system. If the temperature of the air discharged into the cold unit 1 does not exceed the temperature threshold, it indicates that the refrigeration effect of the refrigeration device meets the requirements, that is, the refrigeration operation of the cold unit 1 is carried out normally; if the temperature of the air discharged into the cold unit 1 exceeds the temperature threshold, it indicates that the refrigeration effect of the refrigeration device does not meet the requirements, and the refrigeration device is abnormal. At this time, the control system sends a warning to the personnel to facilitate timely adjustment or maintenance of the refrigeration device.

[0054] Based on the above examples, please refer to Figure 1 The present invention also includes a pressure detection device connected to the control system electrical signal. The pressure detection device is arranged on the exhaust pipe 9 and is used for the air pressure in the exhaust pipe 9. If the air pressure exceeds the preset pressure value, it indicates that the unit pressure is too high, and the control system controls the speed of the expander 22 to reduce the unit pressure; if the air pressure does not exceed the preset pressure value, it indicates that the unit pressure meets the requirements, and the control system controls the speed of the compressor 21 and the expander 22 to remain unchanged. Therefore, the pressure detection device connected to the control system electrical signal can maintain the unit pressure stable, thereby ensuring the normal and stable operation of the unit.

[0055] It should be noted that, in this specification, relational terms such as first and second are merely used to distinguish one entity from other entities, but do not necessarily require or imply any actual relationship or order between these entities.

[0056] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0057] The magnetic levitation air refrigeration device provided by the present invention is introduced in detail above. Specific examples are used in this article to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A magnetic suspension air refrigeration device, characterized in that: The invention comprises a compressor (21), an expander (22) and a heat exchanger (3), wherein the compressor (21) and the expander (22) are coaxially connected to form a compression-expansion integrated machine (2), and the inlet end of the compressor (21) is used to connect to a common refrigeration unit (1), the outlet end of the compressor (21), the heat exchanger (3) and the inlet end of the expander (22) are connected in sequence, and the outlet end of the expander (22) is used to connect to the common refrigeration unit (1).

2. The magnetic suspension air refrigeration device according to claim 1, characterized in that: The compressor (21) is a magnetic levitation compressor (21), and the expander (22) is a magnetic levitation expander (22). The rotor of the magnetic levitation compressor (21) and the rotor of the magnetic levitation expander (22) are connected as a whole via a rotating shaft (5).

3. The magnetic suspension air refrigeration device according to claim 1, characterized in that: The heat exchanger (3) is a plate-fin heat exchanger, and a fan (4) is provided on one side of the heat exchanger (3).

4. The magnetic suspension air refrigeration device according to claim 3, characterized in that: A flow guide cover is provided on the outer periphery of the heat exchanger (3), and the fan (4) is arranged at the cover opening of the flow guide cover.

5. The magnetic suspension air refrigeration device according to claim 1, characterized in that: The integrated compression and expansion machine (2) is arranged on a first support (10), the heat exchanger (3) is arranged on a second support (11), and the inlet end of the heat exchanger (3) is higher than the outlet end of the compressor (21), and the outlet end of the heat exchanger (3) is lower than the inlet end of the expander (22).

6. The magnetic suspension air refrigeration device according to claim 1, characterized in that: The outlet end of the compressor (21) is connected to the inlet end of the heat exchanger (3) through a first pipeline (7), and the outlet end of the heat exchanger (3) is connected to the inlet end of the expander (22) through a second pipeline (8), and the first pipeline (7) and the second pipeline (8) are extended in the same direction.

7. The magnetic suspension air refrigeration device according to claim 6, characterized in that: The integrated compression and expansion machine (2) is arranged in a first shell, and the heat exchanger (3) is arranged in a second shell; Two opposite shell walls of the first shell and the second shell are each provided with a first through hole for the first pipeline (7) to pass through, and a second through hole for the second pipeline (8) to pass through; An intake pipe (6) and an exhaust pipe (9) are also provided on the shell wall of the first shell. The intake pipe (6) connects the refrigeration unit (1) with the inlet end of the compressor (21), and the exhaust pipe (9) connects the outlet end of the expander (22) with the refrigeration unit (1).

8. The magnetic suspension air refrigeration device according to any one of claims 1 to 7, characterized in that: It also includes a first temperature detection device, which is installed in the cooling unit (1), and the first temperature detection device and the compressor (21) are both connected to a control system via electrical signals, and the control system is used to obtain the temperature detected by the first temperature detection device and control the rotation speed of the compressor (21).

9. The magnetic suspension air refrigeration device according to any one of claims 1 to 7, characterized in that: The outlet end of the expander (22) is connected to the common refrigeration unit (1) via an exhaust pipe (9); a second temperature detection device (12) is provided on the exhaust pipe (9); an electrical signal of the second temperature detection device (12) is connected to a control system; the control system is used to obtain the temperature detected by the second temperature detection device (12) and control the rotation speed of the compressor (21).

10. The magnetic suspension air refrigeration device according to claim 9, characterized in that: A pressure detection device (13) is also provided on the exhaust pipe (9), and an electrical signal of the pressure detection device (13) is connected to the control system. The control system is used to obtain the pressure detected by the pressure detection device (13) and control the rotation speed of the compressor (21).

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