Pulse tube refrigerator cold head wireless frequency modulation device, system and method

Abstract

The invention relates to the technical field of pulse tube refrigerators, and provides a pulse tube refrigerator cold head wireless frequency modulation device, system and method, and the pulse tube refrigerator cold head wireless frequency modulation device comprises a cold head driving module which is used for being connected with a cold head of a pulse tube refrigerator; the pulse generation module is connected with the cold head driving module, and the pulse generation module is used for generating a pulse signal; and the wireless frequency modulation module is connected with the pulse generation module, and the wireless frequency modulation module is used for acquiring a control instruction of external control equipment based on wireless communication so as to adjust the frequency of the pulse signal generated by the pulse generation module. Through the cold head driving module, the pulse generation module and the wireless frequency modulation module, the function of remotely and wirelessly adjusting the working frequency of the cold head is achieved, the adjusting operation is more convenient and flexible, remote wireless adjustment can be conducted in the working process of the pulse tube refrigerator, the debugging process is simpler, more convenient and more efficient, the working frequency is accurately adjusted in real time, and the working efficiency is improved. And the efficiency and precision of frequency adjustment are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of pulse tube refrigerators, and in particular to a pulse tube refrigerator cold head wireless frequency modulation device, system and method. Background Art

[0002] The pulse tube refrigerator achieves refrigeration through the compression and expansion process of gas. For a single refrigeration cycle, it includes intake time, exhaust time and the time interval between the two. The timing is the ratio of exhaust time to intake time, that is, the ratio of the time of gas expansion and compression inside the refrigerator. Frequency and timing are important parameters of the pulse tube refrigerator and have a great influence on the performance of the refrigerator. Pulse tube refrigerators of different structural sizes have an optimal operating frequency and optimal timing. Even for pulse tube refrigerators of the same size, due to processing errors and differences in the filling method of cold storage materials, their optimal operating frequencies and timings are also different.

[0003] However, in the prior art, the pulse tube refrigerator needs to be manually operated on the pulse tube control machine body to adjust the operating frequency, which has the problems of inconvenient adjustment and poor flexibility. In addition, for safety reasons, the pulse tube refrigerator is usually required to be completely shut down for adjustment. The debugging process is cumbersome and cannot be adjusted in real time, resulting in the need for multiple adjustments and low adjustment accuracy. Summary of the invention

[0004] The present invention provides a pulse tube refrigerator cold head wireless frequency modulation device, system and method, which are used to solve the problem in the prior art that the pulse tube refrigerator needs to be adjusted on the main body, resulting in inconvenient and cumbersome adjustment.

[0005] The present invention provides a pulse tube refrigerator cold head wireless frequency modulation device, comprising: A cold head driving module, used for connecting with the cold head of the pulse tube refrigerator; A pulse generating module, connected to the cold head driving module, and used to generate a pulse signal; A wireless frequency modulation module is connected to the pulse generation module, and is used to obtain control instructions from an external control device based on wireless communication to adjust the frequency of the pulse signal generated by the pulse generation module.

[0006] According to a pulse tube refrigerator cold head wireless frequency modulation device provided by the present invention, the pulse generating module includes a timer unit and a level conversion unit, the timer unit is respectively connected to the wireless frequency modulation module and the level conversion unit, and the level conversion unit is connected to the cold head driving module.

[0007] According to a pulse tube refrigerator cold head wireless frequency modulation device provided by the present invention, the wireless frequency modulation module includes a first wireless transceiver unit and a second wireless transceiver unit, the first wireless transceiver unit is connected to the pulse generating module, and the second wireless transceiver unit is used to connect to an external control device.

[0008] According to a pulse tube refrigerator cold head wireless frequency modulation device provided by the present invention, the first wireless transceiver unit includes a first radio frequency circuit and a serial communication circuit, and the serial communication circuit is respectively connected to the first radio frequency circuit and the pulse generation module.

[0009] According to a pulse tube refrigerator cold head wireless frequency modulation device provided by the present invention, the second wireless transceiver unit includes a second radio frequency circuit and a communication interface, the communication interface is connected to the second radio frequency circuit, and the communication interface is used to be detachably connected to the control device.

[0010] According to a pulse tube refrigerator cold head wireless frequency modulation device provided by the present invention, the first radio frequency circuit includes a first transmitting modulation circuit, a first receiving demodulation circuit and a first 2.4G antenna, the serial communication circuit is respectively connected to the first transmitting modulation circuit and the first receiving demodulation circuit, and the first transmitting modulation circuit and the first receiving demodulation circuit are both connected to the first 2.4G antenna; The second RF circuit includes a second transmit modulation circuit, a second receive demodulation circuit and a second 2.4G antenna. The communication interface is connected to the second transmit modulation circuit and the second receive demodulation circuit respectively. The second transmit modulation circuit and the second receive demodulation circuit are both connected to the second 2.4G antenna.

[0011] The present invention also provides a pulse tube refrigerator system, including the above-mentioned pulse tube refrigerator cold head wireless frequency modulation device, and also includes a cold head, a compressor, a pulse tube component and a control device, the cold head is respectively connected to the compressor and the pulse tube component, the cold head drive module is connected to the compressor, and the control device is communicatively connected to the wireless frequency modulation module.

[0012] According to a pulse tube refrigerator system provided by the present invention, the cold head includes a rotary valve, and the cold head driving module is connected to the rotary valve to drive the rotary valve to rotate.

[0013] According to a pulse tube refrigerator system provided by the present invention, the pulse tube assembly includes a regenerator, a pulse tube body, a hot end heat exchanger and a cold end heat exchanger, the regenerator is connected to a cold head and the pulse tube body respectively, the cold end heat exchanger is arranged between the pulse tube body and the regenerator, and the hot end heat exchanger is arranged at the other end of the pulse tube body away from the cold end heat exchanger.

[0014] The present invention also provides a pulse tube refrigerator system control method, which is applied to the above-mentioned pulse tube refrigerator system, comprising: The control device generates an adjustment instruction and transmits the adjustment instruction to the wireless frequency modulation module; The wireless frequency modulation module transmits the adjustment instruction to the pulse generation module based on wireless communication; The pulse generating module determines the target frequency according to the adjustment instruction, and generates a corresponding pulse signal according to the target frequency and transmits it to the cold head driving module; The cold head driving module controls the operating frequency of the cold head according to the pulse signal.

[0015] The present invention provides a pulse tube refrigerator cold head wireless frequency modulation device, system and method, which at least have a beneficial effect: the control instruction of the external control device is obtained through the wireless frequency modulation module based on wireless communication to adjust the frequency of the pulse signal generated by the pulse generation module, and then the cold head driving module drives the cold head of the pulse tube refrigerator to work under the action of the pulse signal, so that the cold head working frequency of the pulse tube refrigerator corresponds to the frequency of the pulse signal, and the effect of remote wireless frequency modulation is achieved. In this way, through the structure of the cold head driving module, the pulse generation module and the wireless frequency modulation module, the function of remotely wirelessly adjusting the cold head working frequency of the pulse tube refrigerator is realized, without the need to manually operate close to the pulse tube refrigerator, which is conducive to making the adjustment operation more convenient and flexible, and the remote wireless adjustment can be adjusted during the operation of the pulse tube refrigerator, making the debugging process more simple and efficient, and at the same time, the working frequency can be accurately adjusted in real time, which is conducive to improving the efficiency and accuracy of frequency adjustment. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are 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.

[0017] Figure 1 This is one of the structural frame schematic diagrams of a pulse tube refrigerator cold head wireless frequency modulation device provided by the present invention.

[0018] Figure 2 This is the second structural block diagram of a pulse tube refrigerator cold head wireless frequency modulation device provided by the present invention.

[0019] Figure 3 It is a structural schematic diagram of a pulse tube refrigerator system provided by the present invention.

[0020] Figure 4It is a structural schematic diagram of a compressor, a cold head and a pulse tube assembly in a pulse tube refrigerator system provided by the present invention.

[0021] Reference numerals: 100: cold head driving module; 200: pulse generating module; 210: timer unit; 220: level conversion unit; 300: wireless frequency modulation module; 310: first wireless transceiver unit; 311: first radio frequency circuit; 312: serial communication circuit; 320: second wireless transceiver unit; 321: second radio frequency circuit; 322: communication interface; 400: cold head; 500: compressor; 600: pulse tube assembly; 610: regenerator; 620: pulse tube body; 630: hot end heat exchanger; 640: cold end heat exchanger; 700: control device. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are 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.

[0023] Combine the following Figure 1-Figure 3 The present invention is a pulse tube refrigerator cold head wireless frequency modulation device, comprising: A cold head driving module 100, used to connect to a cold head 400 of a pulse tube refrigerator; A pulse generating module 200, connected to the cold head driving module 100, the pulse generating module 200 is used to generate a pulse signal; The wireless frequency modulation module 300 is connected to the pulse generation module 200 , and is used to obtain control instructions from an external control device 700 based on wireless communication to adjust the frequency of the pulse signal generated by the pulse generation module 200 .

[0024] The wireless frequency modulation module 300 obtains control instructions from the external control device 700 based on wireless communication to adjust the frequency of the pulse signal generated by the pulse generating module 200, and then the cold head driving module 100 drives the cold head 400 of the pulse tube refrigerator to work under the action of the pulse signal, so that the working frequency of the cold head 400 of the pulse tube refrigerator corresponds to the frequency of the pulse signal, thereby achieving the effect of remote wireless frequency modulation.

[0025] In this way, through the structure of the cold head driving module 100, the pulse generating module 200 and the wireless frequency modulation module 300, the function of remotely and wirelessly adjusting the working frequency of the cold head 400 of the pulse tube refrigerator is realized, without the need to manually operate close to the pulse tube refrigerator, which is conducive to making the adjustment operation more convenient and flexible. In addition, the remote wireless adjustment can be performed during the operation of the pulse tube refrigerator, making the debugging process simpler and more efficient. At the same time, the working frequency can be accurately adjusted in real time, which is conducive to improving the efficiency and accuracy of frequency regulation.

[0026] In the related art, the frequency modulation is adjusted inside the compressor, while the present solution provides a pulse tube refrigerator cold head wireless frequency modulation device, which can realize the frequency modulation externally by remote wireless means, which is beneficial to improve the convenience and efficiency of the frequency modulation and make the frequency modulation operation more efficient and quick.

[0027] The pulse tube refrigerator generally includes a compressor 500, a cold head 400 and a pulse tube assembly 600. The cold head 400 is connected to the compressor 500 and the pulse tube assembly 600 respectively. The compressor 500 is used to compress the gas. The cold head 400 may include a rotary valve. The rotary valve is controlled to control the gas to enter the pulse tube assembly 600, the gas to be discharged from the pulse tube assembly 600 or to be in a sealed state between the two. The rotation frequency of the rotary valve is controlled, that is, the working frequency of the cold head 400 is adjusted to adjust the refrigeration process of the pulse tube refrigerator. The wireless frequency modulation module 300 adjusts the frequency of the pulse signal generated by the pulse generation module 200 based on wireless communication, and the cold head driving module 100 drives the cold head 400 of the pulse tube refrigerator to work according to the pulse signal. When the frequency of the pulse signal of the pulse generation module 200 is adjusted to make the cold head 400 work at the optimal working frequency, the pulse tube refrigerator has the best refrigeration efficiency.

[0028] In some embodiments of the present invention, the cold head 400 of the pulse tube refrigerator includes a rotary valve, and the cold head driving module 100 may include a motor driving circuit and a stepping motor, the stepping motor is connected to the rotary valve to accurately drive the rotary valve to rotate, and the motor driving circuit is connected to the stepping motor to control the rotation angle of the stepping motor, thereby driving the rotary valve to work at a specified rotation frequency, thereby controlling the working frequency of the cold head 400. In some embodiments, when the rotary valve of the cold head 400 has its own motor, the cold head driving module 100 may include a motor driving circuit.

[0029] refer to Figure 1 In some embodiments of a pulse tube refrigerator cold head wireless frequency modulation device of the present invention, the pulse generating module 200 includes a timer unit 210 and a level conversion unit 220, the timer unit 210 is respectively connected to the wireless frequency modulation module 300 and the level conversion unit 220, and the level conversion unit 220 is connected to the cold head driving module 100.

[0030] The timer unit 210 generates a signal according to the set timing interval to form a frequency signal, and the frequency signal is transmitted to the level conversion unit 220. The level conversion unit 220 converts the level of the frequency signal into a suitable and stable level to form a pulse signal for controlling the cold head driving module 100. In this way, based on the structure of the timer unit 210 and the level conversion unit 220, the function of pulse generation is realized, the structure is simple and easy to implement, and the level conversion unit 220 can make the level of the pulse signal more stable and reliable.

[0031] In some embodiments of the present invention, the timer unit 210 may be implemented as a single-chip microcomputer, using a timer integrated in the single-chip microcomputer to realize the function of generating a timed signal; in some embodiments, it may also be implemented as a timer circuit.

[0032] In some embodiments of the present invention, the level conversion unit 220 may include a level conversion circuit, a level conversion chip, or other circuit or device implementation. In some embodiments of the present invention, the level conversion unit 220 may include a SN74LVC4245APWR chip. In some embodiments of the present invention, the level conversion unit 220 may be a 3.3V frequency pulse converted into a 5V pulse signal.

[0033] refer to Figure 1 and Figure 2 In some embodiments of a pulse tube refrigerator cold head wireless frequency modulation device of the present invention, the wireless frequency modulation module 300 includes a first wireless transceiver unit 310 and a second wireless transceiver unit 320, the first wireless transceiver unit 310 is connected to the pulse generating module 200, and the second wireless transceiver unit 320 is used to connect to an external control device 700.

[0034] The second wireless transceiver unit 320 is connected to the external control device 700. When the pulse tube refrigerator operating frequency needs to be adjusted, the external control device 700 generates an adjustment instruction and transmits it to the second wireless transceiver unit 320. The second wireless transceiver unit 320 converts the adjustment instruction into a wireless signal and sends it to the first wireless transceiver unit 310. After the first wireless transceiver unit 310 obtains the wireless signal, it restores the wireless signal to the adjustment instruction and transmits it to the pulse generating module 200, so that the pulse generating module 200 adjusts the frequency of the generated pulse signal according to the adjustment instruction. In this way, through the structure of the first wireless transceiver unit 310 and the second wireless transceiver unit 320, the first wireless transceiver unit 310 and the second wireless transceiver unit 320 perform wireless communication correspondingly to realize the function of remote wireless control.

[0035] In some embodiments of the present invention, a connecting pin and a connecting female socket may be further included, wherein the connecting pin is connected to the first wireless transceiver unit 310, the connecting female socket is connected to the pulse generating module 200, and the connecting pin is connected to the connecting female socket to realize the connection between the first wireless transceiver unit 310 and the pulse generating module 200. Through the structure of the connecting pin and the connecting female socket, the installation positions of the first wireless transceiver unit 310 and the pulse generating module 200 can be set more flexibly.

[0036] In some embodiments of the present invention, the first wireless transceiver unit 310 and the second wireless transceiver unit 320 are paired with each other, and the first identification information may be stored in the first wireless transceiver unit 310, and / or the second identification information may be stored in the second wireless transceiver unit 320, and the first wireless transceiver unit 310 and the second wireless transceiver unit 320 are identified and paired according to the first identification information and the second identification information to establish wireless communication. In some embodiments, the first identification information and the second identification information may be MAC addresses.

[0037] In some embodiments of the present invention, after the pulse generating module 200 completes the frequency adjustment according to the adjustment instruction, a response instruction can be generated and transmitted to the first wireless transceiver unit 310, so as to feed back the response instruction to the control device 700 via wireless communication, so that the control device 700 knows that the frequency adjustment has been completed.

[0038] refer to Figure 1 In some embodiments of a pulse tube refrigerator cold head wireless frequency modulation device of the present invention, the first wireless transceiver unit 310 includes a first radio frequency circuit 311 and a serial communication circuit 312, and the serial communication circuit 312 is connected to the first radio frequency circuit 311 and the pulse generating module 200 respectively.

[0039] After the first RF circuit 311 obtains the wireless signal and converts it into an adjustment instruction, the adjustment instruction is transmitted to the pulse generating module 200 through the serial communication circuit 312, so that the pulse generating module 200 adjusts the frequency of the generated pulse signal according to the adjustment instruction. The structure using the serial communication circuit 312 has the advantages of strong anti-interference ability, less resource occupation, and low power consumption, which is conducive to enabling the pulse generating module 200 to more accurately generate a pulse signal of the required frequency.

[0040] refer to Figure 1 In some embodiments of a pulse tube refrigerator cold head wireless frequency modulation device of the present invention, the second wireless transceiver unit 320 includes a second radio frequency circuit 321 and a communication interface 322, the communication interface 322 is connected to the second radio frequency circuit 321, and the communication interface 322 is used to be detachably connected to the control device 700.

[0041] The control device 700 is connected to the communication interface 322, and is connected to the second RF circuit 321 through the communication interface 322. The control device 700 generates a control instruction and transmits it to the second RF circuit 321 through the communication interface 322. The second RF circuit 321 converts the control instruction into a corresponding wireless signal for transmission. By providing a structure with the communication interface 322, it is convenient to connect with different control devices 700, and different control devices 700 can be flexibly used to achieve remote wireless control, which is conducive to making use more convenient.

[0042] In some embodiments of the present invention, the communication interface 322 may include an implementation of an interface such as a USB interface. It is understandable that the communication interface 322 includes a communication processing circuit corresponding to the interface, such as a USB processing circuit corresponding to the USB interface.

[0043] In some embodiments of the wireless frequency modulation device of a pulse tube refrigerator cold head of the present invention, the first radio frequency circuit 311 includes a first transmitting modulation circuit, a first receiving demodulation circuit and a first 2.4G antenna, the serial communication circuit 312 is respectively connected to the first transmitting modulation circuit and the first receiving demodulation circuit, and the first transmitting modulation circuit and the first receiving demodulation circuit are both connected to the first 2.4G antenna; The second RF circuit 321 includes a second transmit modulation circuit, a second receive demodulation circuit and a second 2.4G antenna. The communication interface 322 is connected to the second transmit modulation circuit and the second receive demodulation circuit respectively. The second transmit modulation circuit and the second receive demodulation circuit are both connected to the second 2.4G antenna.

[0044] In the first RF circuit 311, after modulating the signal, the first transmitting modulation circuit converts it into a wireless signal for transmission through the first 2.4G antenna, and the first receiving demodulation circuit obtains the wireless signal through the first 2.4G antenna for demodulation to restore the signal, thereby realizing the transmission and reception of the wireless signal; similarly, in the second RF circuit 321, the second transmitting modulation circuit and the second receiving demodulation circuit also realize the transmission and reception of the wireless signal through the second 2.4G antenna. In this way, the first RF circuit 311 and the second RF circuit 321 transmit wireless signals through the 2.4G antenna, that is, the 2.4G frequency band, which has a strong anti-interference ability and is suitable for various complex industrial environments, which is conducive to making the transmission of the frequency modulation command more stable and reliable, and thus the adjustment of the working frequency of the cold head 400 of the pulse tube refrigerator is also more stable and reliable.

[0045] In some embodiments of the present invention, the first transmitting modulation circuit includes a first modulator, a first up-converter and a first power amplifier, and the serial communication circuit 312, the first modulator, the first up-converter, the first power amplifier and the first 2.4G antenna are connected in sequence; the first receiving demodulation circuit includes a first demodulator, a first filter, a first down-converter and a first amplifier, and the serial communication circuit 312, the first demodulator, the first filter, the first down-converter, the first amplifier and the first 2.4G antenna are connected in sequence. The second transmitting modulation circuit includes a second modulator, a second up-converter and a second power amplifier, and the communication interface 322, the second modulator, the second up-converter, the second power amplifier and the second 2.4G antenna are connected in sequence; the second receiving demodulation circuit includes a second demodulator, a second filter, a second down-converter and a second amplifier, and the communication interface 322, the second demodulator, the second filter, the second down-converter, the second amplifier and the second 2.4G antenna are connected in sequence.

[0046] A pulse tube refrigerator system control method provided by the present invention is described below. The pulse tube refrigerator system control method described below and the pulse tube refrigerator system described above can be referred to each other.

[0047] refer to Figure 3 The present invention also provides a pulse tube refrigerator system, including the above-mentioned pulse tube refrigerator cold head wireless frequency modulation device, and also includes a cold head 400, a compressor 500, a pulse tube component 600 and a control device 700, the cold head 400 is respectively connected to the compressor 500 and the pulse tube component 600, the cold head driving module 100 is connected to the compressor 500, and the control device 700 is communicatively connected to the wireless frequency modulation module 300.

[0048] The compressor 500 is used to compress the gas, and the cold head 400 controls the frequency of the gas entering and exiting the pulsating assembly 600, so that the pulsating assembly 600 can realize the refrigeration function. The control device 700 is connected to the wireless frequency modulation module 300 in communication. When the operating frequency of the cold head 400 needs to be adjusted, the control device 700 generates a control instruction, and the wireless frequency modulation module 300 obtains the control instruction of the control device 700, and transmits the control instruction to the pulse generation module 200 based on wireless communication, so that the pulse generation module 200 adjusts the frequency of the generated pulse signal under the action of the control instruction, and then the cold head driving module 100 drives the cold head 400 to work under the action of the pulse signal, so that the operating frequency of the cold head 400 corresponds to the frequency of the pulse signal, achieving the effect of remote wireless frequency modulation.

[0049] In this way, through the structure of the cold head driving module 100, the pulse generating module 200 and the wireless frequency modulation module 300, the function of remotely and wirelessly adjusting the working frequency of the cold head 400 is realized without the need to manually operate close to the pulse tube refrigerator, which is conducive to making the adjustment operation more convenient and flexible. In addition, the remote wireless adjustment can be performed during the operation of the pulse tube refrigerator, making the debugging process simpler and more efficient. At the same time, the working frequency can be accurately adjusted in real time, which is conducive to improving the efficiency and accuracy of frequency regulation.

[0050] Based on the operation of the compressor 500, the gas is periodically compressed and expanded to generate alternating high and low pressure waves, and the gas enters and exits the pulse tube, forming a temperature gradient between the cold end and the hot end of the pulse tube. The timing and frequency of the gas entry and discharge are adjusted by the cold head 400, so that the cold end of the pulse tube continuously absorbs heat and conducts it to the hot end of the pulse tube for release, thereby achieving a cooling effect.

[0051] refer to Figure 3 In some embodiments of the present invention, the compressor can be arranged in a cabinet, and the pulse tube refrigerator cold head wireless frequency modulation device provided by the present invention can also be arranged in a cabinet. In some embodiments of the present invention, the control device 700 can be an implementation of a device with a control function such as a computer or a main controller.

[0052] refer to Figure 4 In some embodiments of a pulse tube cooling system of the present invention, the cold head 400 includes a rotary valve, and the cold head driving module 100 is connected to the rotary valve to drive the rotary valve to rotate.

[0053] Under the action of the pulse signal, the cold head driving module 100 controls the rotation speed of the rotary valve accordingly, and can control the frequency of gas entering and exiting the pulse tube assembly 600. Under the action of the pulse signal, the cold head driving module 100 can accurately control the rotation angle of the rotary valve, which is convenient for accurately controlling the phase of gas expansion and compression, and can also accurately control the rotation speed of the rotary valve, which is conducive to accurately controlling the working frequency of the cold head 400.

[0054] The cold head 400 adopts a rotary valve structure, which has the advantages of simple structure and high reliability, and is convenient for accurately and stably controlling the entry and exhaust of gas.

[0055] refer to Figure 4 In some embodiments of a pulse tube refrigeration system of the present invention, the pulse tube assembly 600 includes a regenerator 610, a pulse tube body 620, a hot end heat exchanger 630 and a cold end heat exchanger 640, the regenerator 610 is respectively connected to the cold head 400 and the pulse tube body 620, the cold end heat exchanger 640 is arranged between the pulse tube body 620 and the regenerator 610, and the hot end heat exchanger 630 is arranged at the other end of the pulse tube body 620 away from the cold end heat exchanger 640.

[0056] During intake, the gas passes through the regenerator 610 and is initially cooled down before entering the pulse tube body 620. The gas in the pulse tube body 620 is compressed and heated up. The end of the pulse tube body 620 away from the regenerator 610 has the highest temperature and serves as the hot end, which is cooled by the hot end heat exchanger 630. During exhaust, the gas in the pulse tube body 620 expands and is discharged through the regenerator 610. The gas expands and absorbs heat and cools down. The end of the pulse tube body 620 close to the regenerator 610 has the lowest temperature and serves as the cold end. The cold end heat exchanger 640 provides cooling capacity. At the same time, the temperature of the expanded and discharged gas is lower than that during intake, which reduces the temperature of the regenerator 610 and facilitates the initial cooling of the next round of intake gas. A temperature gradient is formed between the cold end and the hot end in the pulse tube body 620, allowing the heat absorbed by the cold end to be dissipated from the hot end, and the cold end is cooled. The regenerator 610 recovers the cooling capacity of the cold end to initially cool the intake gas, which is conducive to improving the cooling efficiency.

[0057] In some embodiments of the present invention, the pulse generation module 200 includes a single chip microcomputer and a level conversion unit 220, and the wireless frequency modulation module 300 includes a first radio frequency circuit 311, a serial communication circuit 312, a second radio frequency circuit 321, and a communication interface 322. When in use, the communication interface 322 is connected to the control device 700 to connect the control device 700 to the second radio frequency circuit 321; the compressor 500, the wireless frequency modulation module 300, the pulse generation module 200, and the cold head driving module 100 are started, and the first radio frequency circuit 311 and the second radio frequency circuit 321 are paired to establish wireless communication. When frequency modulation is required, the control device 700 generates a frequency modulation instruction. The frequency modulation instruction may include information such as "frame header + channel + speed + frame tail". The frequency modulation instruction is converted into a corresponding wireless signal by the second RF circuit 321 for transmission; the first RF circuit 311 receives and obtains the wireless signal and converts it back into a frequency modulation instruction. The frequency modulation instruction is transmitted to the single-chip microcomputer. The single-chip microcomputer parses the frequency modulation instruction. After obtaining the channel and speed information, it generates a pulse signal of corresponding frequency according to the speed information and transmits it to the cold head driving module 100, thereby adjusting the working frequency of the cold head 400 to achieve the effect of remote wireless frequency modulation.

[0058] In some embodiments of the present invention, after adjusting the operating frequency of the cold head 400, the single chip microcomputer obtains the actual operating frequency of the cold head 400 and generates a response instruction. The response instruction may include information such as "SUCCES+channel+RPM+speed", and is transmitted to the control device 700 by wireless communication through the first RF circuit 311 and the second RF circuit 321, so that the control device 700 is informed that the frequency modulation is successful and obtains information such as the operating frequency of the cold head 400.

[0059] The present invention also provides a pulse tube refrigerator system control method, which is applied to the above-mentioned pulse tube refrigerator system, comprising: The control device 700 generates an adjustment instruction and transmits the adjustment instruction to the wireless frequency modulation module 300; The wireless frequency modulation module 300 transmits the adjustment instruction to the pulse generation module 200 based on wireless communication; The pulse generating module 200 determines the target frequency according to the adjustment instruction, and generates a corresponding pulse signal according to the target frequency and transmits it to the cold head driving module 100; The cold head driving module 100 controls the operating frequency of the cold head 400 according to the pulse signal.

[0060] The control device 700 is communicatively connected with the wireless frequency modulation module 300. When the operating frequency of the cold head 400 needs to be adjusted, the control device 700 generates a control instruction, the wireless frequency modulation module 300 obtains the control instruction of the control device 700, and transmits the control instruction to the pulse generating module 200 based on wireless communication, so that the pulse generating module 200 adjusts the frequency of the generated pulse signal under the action of the control instruction, and then the cold head driving module 100 drives the cold head 400 to work under the action of the pulse signal, so that the operating frequency of the cold head 400 corresponds to the frequency of the pulse signal, thereby achieving the effect of remote wireless frequency modulation.

[0061] In this way, through the structure of the cold head driving module 100, the pulse generating module 200 and the wireless frequency modulation module 300, the function of remotely and wirelessly adjusting the working frequency of the cold head 400 is realized without the need to manually operate close to the pulse tube refrigerator, which is conducive to making the adjustment operation more convenient and flexible. In addition, the remote wireless adjustment can be performed during the operation of the pulse tube refrigerator, making the debugging process simpler and more efficient. At the same time, the working frequency can be accurately adjusted in real time, which is conducive to improving the efficiency and accuracy of frequency regulation.

[0062] In some embodiments of the pulse tube refrigerator system control method of the present invention, after the pulse generating module 200 determines the target frequency according to the adjustment instruction and generates a corresponding pulse signal according to the target frequency and transmits it to the cold head driving module 100, it also includes: The pulse generation module 200 generates a response instruction and transmits the response instruction to the wireless frequency modulation module 300; The wireless frequency modulation module 300 transmits the response instruction to the control device 700 based on wireless communication; The response instruction is used to indicate that the frequency modulation is completed.

[0063] By returning a response instruction to the control device 700, the control device 700 can be informed whether the frequency modulation is successful, which is conducive to making the control process more reliable and facilitating timely discovery and notification when an abnormality occurs.

[0064] In some embodiments of the present invention, the response instruction may include operating frequency information of the cold head 400 .

[0065] In the description of the present invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0066] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are contradictory.

[0067] All actions to obtain signals, information or data in this application are carried out in compliance with the relevant data protection laws and policies of the location and with the authorization given by the owner of the corresponding device.

[0068] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A pulse tube refrigerator cold head wireless frequency modulation device, characterized in that: include: A cold head driving module (100) used to be connected to a cold head (400) of a pulse tube refrigerator; A pulse generating module (200) connected to the cold head driving module (100), the pulse generating module (200) being used to generate a pulse signal; A wireless frequency modulation module (300) is connected to the pulse generation module (200), and the wireless frequency modulation module (300) is used to obtain a control instruction of an external control device (700) based on wireless communication to adjust the frequency of the pulse signal generated by the pulse generation module (200).

2. A pulse tube refrigerator cold head wireless frequency modulation device according to claim 1, characterized in that: The pulse generation module (200) comprises a timer unit (210) and a level conversion unit (220); the timer unit (210) is connected to the wireless frequency modulation module (300) and the level conversion unit (220) respectively; and the level conversion unit (220) is connected to the cold head driving module (100).

3. A pulse tube refrigerator cold head wireless frequency modulation device according to claim 2, characterized in that: The wireless frequency modulation module (300) comprises a first wireless transceiver unit (310) and a second wireless transceiver unit (320); the first wireless transceiver unit (310) is connected to the pulse generation module (200); and the second wireless transceiver unit (320) is used to connect to an external control device (700).

4. A pulse tube refrigerator cold head wireless frequency modulation device according to claim 3, characterized in that: The first wireless transceiver unit (310) comprises a first radio frequency circuit (311) and a serial communication circuit (312), and the serial communication circuit (312) is connected to the first radio frequency circuit (311) and the pulse generation module (200) respectively.

5. A pulse tube refrigerator cold head wireless frequency modulation device according to claim 4, characterized in that: The second wireless transceiver unit (320) comprises a second radio frequency circuit (321) and a communication interface (322), wherein the communication interface (322) is connected to the second radio frequency circuit (321), and the communication interface (322) is used to be detachably connected to the control device (700).

6. A pulse tube refrigerator cold head wireless frequency modulation device according to claim 5, characterized in that: The first radio frequency circuit (311) comprises a first transmitting modulation circuit, a first receiving demodulation circuit and a first 2.4G antenna, the serial communication circuit (312) is connected to the first transmitting modulation circuit and the first receiving demodulation circuit respectively, and the first transmitting modulation circuit and the first receiving demodulation circuit are both connected to the first 2.4G antenna; The second radio frequency circuit (321) comprises a second transmitting modulation circuit, a second receiving demodulation circuit and a second 2.4G antenna, the communication interface (322) is connected to the second transmitting modulation circuit and the second receiving demodulation circuit respectively, and the second transmitting modulation circuit and the second receiving demodulation circuit are both connected to the second 2.4G antenna.

7. A pulse tube refrigerator system, characterized in that: The invention comprises a pulse tube refrigerator cold head wireless frequency modulation device as claimed in any one of claims 1 to 6, and further comprises a cold head (400), a compressor (500), a pulse tube assembly (600) and a control device (700), wherein the cold head (400) is respectively connected to the compressor (500) and the pulse tube assembly (600), the cold head drive module (100) is connected to the compressor (500), and the control device (700) is communicatively connected to the wireless frequency modulation module (300).

8. The pulse tube refrigerator system according to claim 7, characterized in that: The cold head (400) comprises a rotary valve, and the cold head driving module (100) is connected to the rotary valve to drive the rotary valve to rotate.

9. The pulse tube refrigerator system according to claim 7, characterized in that: The pulse tube assembly (600) comprises a regenerator (610), a pulse tube body (620), a hot end heat exchanger (630) and a cold end heat exchanger (640); the regenerator (610) is respectively connected to a cold head (400) and the pulse tube body (620); the cold end heat exchanger (640) is arranged between the pulse tube body (620) and the regenerator (610); and the hot end heat exchanger (630) is arranged at the other end of the pulse tube body (620) away from the cold end heat exchanger (640).

10. A pulse tube refrigerator system control method, characterized in that: A pulse tube refrigerator system as claimed in any one of claims 7 to 9, comprising: The control device (700) generates an adjustment instruction and transmits the adjustment instruction to the wireless frequency modulation module (300); The wireless frequency modulation module (300) transmits the adjustment instruction to the pulse generation module (200) based on wireless communication; The pulse generating module (200) determines the target frequency according to the adjustment instruction, and generates a corresponding pulse signal according to the target frequency and transmits it to the cold head driving module (100); The cold head driving module (100) controls the operating frequency of the cold head (400) according to the pulse signal.

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