Double-temperature-zone pulse tube refrigerator and temperature control device and temperature control method thereof

Abstract

The invention discloses a double-temperature-zone pulse tube refrigerator and a temperature control device and method thereof, and relates to the technical field of double-temperature-zone pulse tube refrigerators, and the temperature control device of the double-temperature-zone pulse tube refrigerator comprises a control system, a heating device and two temperature sensors; the control system is in communication connection with the temperature sensors, the heating device and a compressor driving system of the double-temperature-zone pulse tube refrigerator, and the two temperature sensors are used for monitoring the temperature of a high-temperature-zone cold finger and a low-temperature-zone cold finger in the double-temperature-zone pulse tube refrigerator and transmitting temperature information to the control system; the heating device is used for heating the high-temperature zone cold finger for temperature compensation, and the control system controls the working state of the heating device according to the temperature information of the high-temperature zone cold finger; the control system controls the compressor driving system to adjust the working state of the compressor according to the temperature information of the low-temperature area cold finger. According to the invention, the temperatures of the two cold ends can be accurately adjusted.

Description

Technical Field

[0001] The present invention relates to the technical field of dual-temperature zone pulse tube refrigerators, and in particular to a dual-temperature zone pulse tube refrigerator and a temperature control device and a temperature control method thereof. Background Art

[0002] A dual-zone pulse tube refrigerator driven by a single compressor is a refrigeration device that uses a compressor to simultaneously drive two pulse tube refrigerators in different temperature zones, and can provide refrigeration needs at different refrigeration temperatures. However, the existing dual-zone pulse tube refrigerators driven by a single compressor have the defects of difficult and inaccurate temperature control. Summary of the invention

[0003] The object of the present invention is to provide a dual-temperature zone pulse tube refrigerator and a temperature control device and a temperature control method thereof, so as to solve the problems existing in the above-mentioned prior art and realize precise control of the temperatures of the two cold ends.

[0004] To achieve the above object, the present invention provides the following solutions: The present invention provides a temperature control device for a dual-temperature zone pulse tube refrigerator, comprising: a control system, a heating device and two temperature sensors; the control system and the temperature sensor, the heating device and a compressor drive system of the dual-temperature zone pulse tube refrigerator are all communicatively connected, the two temperature sensors are used to monitor the temperatures of a high-temperature zone cold finger and a low-temperature zone cold finger in the dual-temperature zone pulse tube refrigerator and transmit the temperature information to the control system; the heating device is used to heat the high-temperature zone cold finger for temperature compensation, the control system controls the working state of the heating device according to the temperature information of the high-temperature zone cold finger; the control system controls the compressor drive system to adjust the working state of the compressor according to the temperature information of the low-temperature zone cold finger.

[0005] Preferably, the working status includes working power and working time.

[0006] Preferably, the heating device is a heating plate, and the heating plate is fixedly arranged at one end of the high temperature zone cold finger.

[0007] Preferably, the heating plate is connected to one end of the high temperature zone cold finger by bonding or screwing.

[0008] Preferably, it also includes a compressor piston displacement sensor, which is used to detect the motion state information of the compressor piston and transmit it to the control system. The control system determines the required motion state of the piston based on the temperature information of the cold finger in the low-temperature zone. The control system controls the working state of the compressor based on the required motion state of the piston and the actual motion state information of the compressor piston.

[0009] Preferably, the compressor is a dual-piston compressor, and the motion state information includes the amplitudes of the two pistons.

[0010] Preferably, the compressor piston displacement sensor is an LVDT displacement sensor.

[0011] The present invention also provides a temperature control method for a dual-temperature zone pulse tube refrigerator, comprising: Temperature monitoring: monitor the temperature of the cold finger in the high temperature zone and the cold finger in the low temperature zone through the temperature sensor; First cold finger temperature control: the control system controls the power of the compressor according to the temperature information of the cold finger in the low temperature zone until the temperature of the cold finger in the low temperature zone reaches the set value; Second cold finger temperature control: The control system controls the heating power of the heating device according to the temperature of the cold finger in the high temperature zone until the temperature of the cold finger in the high temperature zone reaches the set value.

[0012] Preferably, the compressor is provided with a compressor piston displacement sensor; the compressor piston displacement sensor is used to detect the motion state information of the compressor piston and transmit it to the control system; the control system determines the required motion state of the piston according to the temperature information of the cold finger in the low-temperature zone, and the control system controls the working state of the compressor according to the required motion state of the piston and the actual motion state information of the compressor piston.

[0013] The present invention also provides a dual-temperature zone pulse tube refrigerator, comprising the dual-temperature zone pulse tube refrigerator temperature control device as described above.

[0014] Compared with the prior art, the present invention has achieved the following technical effects: The solution provided by the present invention controls the temperature of two cold ends through different temperature control strategies, the two cold ends being the cold end of the cold finger in the high temperature zone and the cold end of the cold finger in the low temperature zone, thereby achieving precise adjustment of the temperature of the two cold ends. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] 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 will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1 A schematic diagram of the structure of a dual-zone pulse tube refrigerator temperature control device and a dual-zone pulse tube refrigerator including the dual-zone pulse tube refrigerator temperature control device provided in an embodiment of the present invention; In the figure: 1-1 is a compressor; 1-2 is a cold finger in a high temperature zone; 1-3 is a cold finger in a low temperature zone; 1-4 is a phase adjustment mechanism of the cold finger in a high temperature zone; 1-5 is a phase adjustment mechanism of the cold finger in a low temperature zone; 2-1 is a temperature sensor of the cold finger in a high temperature zone; 2-2 is a temperature sensor of the cold finger in a low temperature zone; 2-3 is a piston displacement sensor of the compressor; 2-4 is a heating plate; 3-1 is a control system; 3-2 is a compressor drive system. DETAILED DESCRIPTION

[0017] 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.

[0018] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0019] The dual-temperature zone pulse tube refrigerator is driven by a single compressor, and the piston movement is driven by a linear motor. The opposing pistons in the compressor vibrate at a high frequency sinusoidally under the drive of the motor structure. The piston vibration generates a high-frequency sinusoidal pressure wave. The compressor first converts the electrical power input to the refrigerator into acoustic power, and then generates a volume flow of sinusoidal vibrations of the same frequency. Subsequently, the acoustic power in the compression chamber enters the high-temperature zone cold finger and the low-temperature zone cold finger through the transmission connecting pipe for expansion refrigeration. In the related technology, two pulse tube refrigerators can also be driven by two compressors respectively. By adjusting the electrical parameters of the two compressors respectively, dual-temperature zone temperature stability control can be achieved, but its structure is complex and the cost is high.

[0020] Combine the following Figure 1 , describing an embodiment of the present invention.

[0021] The present invention provides a temperature control device for a dual-temperature zone pulse tube refrigerator, comprising: a control system 3-1, a heating device and two temperature sensors; the control system 3-1 and the temperature sensor, the heating device and a compressor drive system 3-2 of the dual-temperature zone pulse tube refrigerator are all communicatively connected, the two temperature sensors are used to monitor the temperatures of a high-temperature zone cold finger 1-2 and a low-temperature zone cold finger 1-3 in the dual-temperature zone pulse tube refrigerator and transmit the temperature information to the control system 3-1; the heating device is used to heat the high-temperature zone cold finger 1-2 for temperature compensation, and the control system 3-1 controls the working state of the heating device according to the temperature information of the high-temperature zone cold finger 1-2; the control system 3-1 controls the compressor drive system 3-2 to adjust the working state of the compressor 1-1 according to the temperature information of the low-temperature zone cold finger 1-3.

[0022] The temperature of the high temperature zone cold finger 1-2 in the embodiment of the present invention is higher than that of the low temperature zone cold finger 1-3. The temperature of the high temperature zone cold finger 1-2 is heated by the heating device for temperature compensation. It can be understood that under the best use condition, the heating device is always in working condition, and then the power of the heating device is adjusted to adjust the temperature compensation amount to achieve precise control of the temperature of the high temperature zone cold finger 1-2.

[0023] When in use, the temperature of the cold finger 1-3 in the low temperature zone is adjusted by adjusting the working state of the compressor 1-1; the temperature of the cold finger 1-2 in the high temperature zone is adjusted by controlling the working state of the heating device.

[0024] The solution provided by the present invention controls the temperature of two cold ends through different temperature control strategies, namely the cold end of cold finger 1-2 in the high temperature zone and the cold end of cold finger 1-3 in the low temperature zone, thereby realizing precise adjustment of the temperature of the two cold ends.

[0025] In addition, the present invention realizes automatic temperature control without manual intervention, which greatly improves the convenience of operation and the automation level of the system.

[0026] The invention adopts a design of different control methods for different cold ends, which can effectively solve the problem of accurately controlling the temperatures of two cold ends of a dual-temperature zone pulse tube refrigerator, and realizes independent and accurate temperature control of the dual cold ends.

[0027] In some embodiments, the working status includes working power and working time.

[0028] This embodiment adjusts the temperature of the cold finger by adjusting the working power and working time of the heating device and the compressor 1 - 1 .

[0029] In some embodiments, the heating device is a heating plate 2-4, and the heating plate 2-4 is fixedly disposed at one end of the high temperature zone cold finger 1-2, specifically, the cold end of the high temperature zone cold finger 1-2.

[0030] The heating plate 2-4 in this embodiment generates heat by using the principle of resistance heating. The heating plate 2-4 is integrated at one end of the high temperature zone cold finger 1-2 so that the appearance of the improved product is not much different from that of the original product, and only minor changes need to be made to the original product.

[0031] In some embodiments, the heating plate 2 - 4 is connected to one end of the high temperature zone cold finger 1 - 2 by bonding or screwing.

[0032] The threaded connection in this embodiment is fixed to one end of the high temperature zone cold finger 1 - 2 by bolts.

[0033] In some embodiments, the embodiments of the present invention also include a compressor piston displacement sensor 2-3, which is used to detect the motion state information of the compressor piston and transmit it to the control system 3-1. The control system 3-1 determines the required motion state of the piston based on the temperature information of the low-temperature zone cold finger 1-3. The control system 3-1 controls the working state of the compressor 1-1 based on the required motion state of the piston and the actual motion state information of the compressor piston.

[0034] This embodiment realizes closed-loop control of the electric power input to the compressor 1 - 1 .

[0035] In some embodiments, the compressor 1-1 is a dual-piston compressor, and the motion state information includes the amplitudes of the two pistons. Specifically, the compressor piston displacement sensor 2-3 is an LVDT displacement sensor; since the two pistons approach and move away from each other synchronously, their displacements are the same, therefore, the detection head of the LVDT displacement sensor and one of the pistons in the dual-piston compressor can establish a displacement transmission relationship, for example, the detection head can be in contact with the piston or piston rod, or they can be connected to each other, and the connection here includes indirect connection and direct connection.

[0036] The present invention also provides a temperature control method for a dual-temperature zone pulse tube refrigerator, comprising: Temperature monitoring: Monitor the temperature of cold fingers 1-2 in the high temperature zone and cold fingers 1-3 in the low temperature zone through temperature sensors; First cold finger temperature control: the control system 3-1 controls the power of the compressor 1-1 according to the temperature information of the low temperature zone cold finger 1-3 until the temperature of the low temperature zone cold finger 1-3 reaches the set value; Second cold finger temperature control: The control system 3 - 1 controls the heating power of the heating device according to the temperature of the high temperature zone cold finger 1 - 2 until the temperature of the high temperature zone cold finger 1 - 2 reaches the set value.

[0037] This embodiment has all the advantages of the above embodiments, which will not be described in detail here.

[0038] In some embodiments, a compressor piston displacement sensor 2-3 is configured on the compressor 1-1; the compressor piston displacement sensor 2-3 is used to detect the motion state information of the compressor piston and transmit it to the control system 3-1; the control system 3-1 determines the required motion state of the piston based on the temperature information of the low-temperature zone cold finger 1-3, and the control system 3-1 controls the working state of the compressor 1-1 based on the required motion state of the piston and the actual motion state information of the compressor piston.

[0039] The present invention also provides a dual-temperature zone pulse tube refrigerator, comprising the dual-temperature zone pulse tube refrigerator temperature control device as described above, as well as low-temperature zone cold fingers 1-3, high-temperature zone cold fingers 1-2, a phase adjustment mechanism 1-4 of the high-temperature zone cold fingers, a phase adjustment mechanism 1-5 of the low-temperature zone cold fingers, a compressor 1-1, and a compressor drive system 3-2.

[0040] The control system 3-1 controls the compressor driving system 3-2 to drive the compressor 1-1 to work. The compressor 1-1 is connected to the high-temperature zone cold finger 1-2 and the low-temperature zone cold finger 1-3 through the transmission pipe. The phase adjustment mechanism 1-4 of the high-temperature zone cold finger is connected to the high-temperature zone cold finger 1-2, and the phase adjustment mechanism 1-5 of the low-temperature zone cold finger is connected to the low-temperature zone cold finger 1-3. Since the present invention does not improve the connection structure between the phase adjustment mechanism and the cold finger and the connection structure between the compressor 1-1 and the cold finger, this specification does not describe this in detail.

[0041] This embodiment has all the advantages of the above embodiments, which will not be described in detail here.

[0042] The solution provided by the present invention significantly improves the temperature control accuracy and stability of the dual-temperature zone pulse tube refrigerator, simplifies system operation, and enhances the adaptability of the system. It is particularly suitable for low-temperature scientific research and related fields with extremely high temperature control requirements.

[0043] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A temperature control device for a dual-temperature zone pulse tube refrigerator, characterized in that: include: A control system, a heating device and two temperature sensors; the control system and the temperature sensor, the heating device and the compressor drive system of the dual-temperature zone pulse tube refrigerator are all in communication connection, the two temperature sensors are used to monitor the temperature of the high-temperature zone cold finger and the low-temperature zone cold finger in the dual-temperature zone pulse tube refrigerator and transmit the temperature information to the control system; the heating device is used to heat the high-temperature zone cold finger for temperature compensation, and the control system controls the working state of the heating device according to the temperature information of the high-temperature zone cold finger; The control system controls the compressor driving system to adjust the working state of the compressor according to the temperature information of the low-temperature zone cold finger.

2. The temperature control device for a dual-zone pulse tube refrigerator according to claim 1, characterized in that: The working status includes working power and working time.

3. The temperature control device for a dual-zone pulse tube refrigerator according to claim 1, characterized in that: The heating device is a heating plate, and the heating plate is fixedly arranged at one end of the high temperature zone cold finger.

4. The temperature control device for a dual-zone pulse tube refrigerator according to claim 3, characterized in that: The heating plate is connected to one end of the high temperature zone cold finger by bonding or screwing.

5. The temperature control device for a dual-zone pulse tube refrigerator according to claim 1, characterized in that: It also includes a compressor piston displacement sensor, which is used to detect the motion state information of the compressor piston and transmit it to the control system. The control system determines the required motion state of the piston based on the temperature information of the cold finger in the low-temperature zone. The control system controls the working state of the compressor based on the required motion state of the piston and the actual motion state information of the compressor piston.

6. The temperature control device for a dual-zone pulse tube refrigerator according to claim 5, characterized in that: The compressor is a dual-piston compressor, and the motion state information includes the amplitudes of the two pistons.

7. The temperature control device for a dual-zone pulse tube refrigerator according to claim 6, characterized in that: The compressor piston displacement sensor is an LVDT displacement sensor.

8. A temperature control method for a dual-temperature zone pulse tube refrigerator, characterized in that: include: Temperature monitoring: monitor the temperature of the cold finger in the high temperature zone and the cold finger in the low temperature zone through the temperature sensor; First cold finger temperature control: the control system controls the power of the compressor according to the temperature information of the cold finger in the low temperature zone until the temperature of the cold finger in the low temperature zone reaches the set value; Second cold finger temperature control: The control system controls the heating power of the heating device according to the temperature of the cold finger in the high temperature zone until the temperature of the cold finger in the high temperature zone reaches the set value.

9. The temperature control method of a dual-zone pulse tube refrigerator according to claim 8, characterized in that: The compressor is equipped with a compressor piston displacement sensor; the compressor piston displacement sensor is used to detect the motion state information of the compressor piston and transmit it to the control system; The control system determines the required motion state of the piston according to the temperature information of the low-temperature zone cold finger, and the control system controls the working state of the compressor according to the required motion state of the piston and the actual motion state information of the compressor piston.

10. A dual-temperature zone pulse tube refrigerator, characterized in that: A temperature control device for a dual-temperature zone pulse tube refrigerator comprising the temperature control device of any one of claims 1 to 7.

Images