A circuit control system based on liquid helium-free temperature control equipment

Abstract

The present application relates to the field of cryogenic temperature control technology, and in particular to a circuit control system based on a liquid helium-free temperature control device, wherein the circuit control system comprises: a temperature control module, comprising an information receiving unit and a refrigeration control unit, the refrigeration control unit being used to control a refrigeration device to perform a refrigeration operation, the information receiving unit being used to send the received and collected first temperature information and second temperature information to a main control module; a vacuum control module being used to control a vacuum device to perform a vacuum operation on the liquid helium-free temperature control device, and being used to receive pipeline pressure information and send the information to the main control module; the main control module being electrically connected to the temperature control module and the vacuum control module, respectively, and when the vacuum degree indicated by the pipeline pressure information meets a preset vacuum condition, the main control module being able to send a refrigeration trigger instruction to control the refrigeration device to perform a refrigeration operation; and determining the temperature control instruction currently corresponding to the refrigeration device based on the first temperature information and the second temperature information to control the operating state of the refrigeration device.

Description

Technical Field

[0001] The present application relates to the field of cryogenic temperature control technology, and in particular to a circuit control system based on a liquid helium-free temperature control device. Background Art

[0002] At present, the liquid helium-free temperature control system mainly relies on dry refrigeration technology, such as pulse tube cryocooler and GM cryocooler. These cryocoolers use the compression and expansion cycle of gas (usually helium) to achieve low-temperature refrigeration. The cold head of the cryocooler exchanges heat with the helium in the refrigeration system, cooling the helium in the system into cold helium; then the circulating pump circulates the cold helium to allow the sample in the thermostat to exchange heat with the cold helium, and the sample temperature in the thermostat is maintained at a relatively stable value through a high-precision temperature controller.

[0003] However, after the hardware design is completed, the use of cryogenic equipment in scientific research sites generally requires manual replenishment / release of helium according to the various instruments, temperatures, valves, etc. on the refrigeration equipment, turning on the vacuum pump to increase the vacuum degree of the insulation pipe, and manually setting the flow rate to maintain a stable temperature of the sample in the thermostat. The whole process is cumbersome and labor-intensive, and sometimes it is necessary to contact the manufacturer for guidance before use, which brings a high threshold to the use of cryogenic equipment.

[0004] Therefore, it is necessary to provide an improved circuit control system based on a liquid helium-free temperature control device to solve at least one of the above-mentioned prior art problems. Summary of the invention

[0005] The present application provides a circuit control system based on a liquid helium-free temperature control device, which is applied to the liquid helium-free temperature control device. The liquid helium-free temperature control device includes a sample end and a refrigeration device. The sample end and the refrigeration device are connected by a pipeline. The main control circuit system includes:

[0006] The temperature control module includes an information receiving unit and a refrigeration control unit, wherein the refrigeration control unit is used to control the refrigeration device to perform a refrigeration operation, and the information receiving unit is used to receive the collected first temperature information and second temperature information, and send them to the main control module; the first temperature information is used to indicate the current temperature in the cold head cavity of the refrigeration device, and the second temperature information is used to indicate the current temperature of the sample end;

[0007] A vacuum control module, used to control the vacuum device to evacuate the liquid helium-free temperature control device, and to receive pipeline pressure information and send it to the main control module, wherein the pipeline pressure information is used to indicate the vacuum degree in the connecting pipeline between the sample end and the refrigeration device;

[0008] a main control module, electrically connected to the temperature control module and the vacuum control module, respectively, for sending a refrigeration trigger instruction to the temperature control module when the vacuum degree indicated by the pipeline pressure information satisfies a preset vacuum condition, so that the temperature control module controls the refrigeration device to perform the refrigeration operation in response to the refrigeration trigger instruction; and determining the temperature control instruction currently corresponding to the refrigeration device based on the first temperature information and the second temperature information, and sending the temperature control instruction to the temperature control module, so that the temperature control module controls the operating state of the refrigeration device based on the temperature control instruction;

[0009] The main control module is also used to respond to the remote control instruction sent by the host computer and execute the control operation corresponding to the remote control instruction.

[0010] Furthermore, the main control module is also used to send a detection refrigeration instruction to the refrigeration control unit before the vacuum control module controls the vacuum device to perform a vacuum operation; the refrigeration control unit is also used to control the refrigeration device to perform a detection refrigeration operation in response to the detection refrigeration instruction, and send the first temperature information and the second temperature information during the detection refrigeration operation to the main control module; the main control module is also used to compare the first temperature information and the first target temperature information during the detection refrigeration operation to obtain a first comparison result, and compare the second temperature information and the second target temperature information to obtain a second comparison result; when the first temperature comparison result and the second temperature comparison result both meet the preset normal temperature comparison result, it is determined that the liquid helium-free temperature control device is in a low-temperature environment state, and the first target temperature information is used to indicate the target temperature to be reached in the cold head cavity during the refrigeration detection operation; the second target temperature information is used to indicate the target temperature to be reached in the sample end during the refrigeration detection operation.

[0011] Furthermore, the temperature control module also includes a heating control unit, and the liquid nitrogen-free temperature control equipment also includes a heating device; the main control module is used to send a heating instruction to the heating control unit in response to a shutdown event of the liquid nitrogen-free temperature control equipment; the heating control unit is used to control the heating device to perform a heating operation in response to the heating instruction, and send second temperature information during the heating operation to the main control module; the main control module is also used to compare the second temperature information with the preset normal temperature information during the heating operation to obtain a temperature comparison result; and determine the heating state of the heating device according to the temperature comparison result, and the preset normal temperature information is used to indicate the preset normal temperature that needs to be reached in the sample end during the operation of the heating device.

[0012] Furthermore, the circuit control system also includes a cleaning control module, and the liquid helium-free temperature control equipment also includes a purging device; the cleaning control module is electrically connected to the main control module, and the cleaning control module is used to control the purging device to perform a purging operation; the main control module is used to send a purging instruction to the cleaning control module when the vacuum degree indicated by the pipeline pressure information meets a preset vacuum degree condition, so that the cleaning control module controls the purging device to perform a purging operation in response to the purging instruction.

[0013] Furthermore, the main control module is also used to send a low-temperature cycle instruction to the temperature control module during the refrigeration operation if it is detected that the first temperature information and the second temperature information meet the steady-state condition, and meeting the steady-state condition means that the current temperature in the cold head cavity indicated by the first temperature information and the current temperature at the sample end indicated by the second temperature information both reach the expected refrigeration state; the temperature control module is also used to control the refrigeration device to perform a refrigeration cycle operation in response to the low-temperature cycle instruction.

[0014] Further, a first cold head and a second cold head are arranged in the cold head cavity of the refrigeration device; the sample end includes a sample cavity and a sample holder arranged in the sample cavity; the first temperature information includes a first temperature and a second temperature, the first temperature is used to indicate the current temperature of the first cold head in the cold head cavity of the refrigeration device, and the second temperature is used to indicate the current temperature of the second cold head in the cold head cavity of the refrigeration device; the second temperature information includes a third temperature and a fourth temperature, the third temperature is used to indicate the current temperature of the sample cavity of the sample end, and the fourth temperature is used to indicate the current temperature of the sample holder of the sample end; satisfying the steady-state condition means that the current temperature of the first cold head indicated by the first temperature and the current temperature of the second cold head indicated by the second temperature both reach the expected refrigeration state of their respective cold head ends; and the current temperature of the sample cavity of the sample end indicated by the third temperature and the current temperature of the sample holder of the sample end indicated by the fourth temperature both reach the expected refrigeration state of the sample end.

[0015] Furthermore, the main control module also includes a human-computer interaction interface, and the liquid helium-free temperature control equipment also includes an interaction device; the main control module is communicatively connected to the interaction device through the human-computer interaction interface, and is used to respond to the interaction control instruction sent by the interaction device and execute the interaction control operation corresponding to the interaction control instruction.

[0016] Furthermore, the main control module is also used to obtain the operating status information of the liquid helium-free temperature control device and send the operating status information to the interactive device; the interactive device is used to display the operating status of the liquid helium-free temperature control device based on the operating status information.

[0017] Furthermore, the vacuum control module is also used to obtain the rotational speed information of the vacuum device and send it to the main control module; the main control module is also used to send sampling prompt information to the interactive device when the temperature indicated by the second temperature information reaches a preset sampling temperature and the rotational speed information meets a preset sampling speed condition, so that the interactive device displays the sampling prompt information.

[0018] Furthermore, the circuit control system also includes an alarm control module, which is electrically connected to the main control module; the main control module is also used to perform fault detection based on the operating status information of the liquid helium-free temperature control equipment and generate a fault detection result; if the fault detection result indicates that there is an equipment failure event, a fault alarm signal is sent to the alarm control module; the alarm control module is used to control the alarm device to release fault alarm information in response to the fault alarm signal.

[0019] The circuit control system based on the liquid helium-free temperature control device provided by the present application has at least the following technical effects:

[0020] The circuit control system based on the liquid helium-free temperature control device in the present application is applied to the liquid helium-free temperature control device. The liquid helium-free temperature control device includes a sample end and a refrigeration device, and the sample end and the refrigeration device are connected by pipeline. The circuit control system includes: a temperature control module, including an information receiving unit and a refrigeration control unit, the refrigeration control unit is used to control the refrigeration device to perform a refrigeration operation, and the information receiving unit is used to receive the collected first temperature information and the second temperature information, and send them to the main control module; the first temperature information is used to indicate the current temperature in the cold head cavity of the refrigeration device, and the second temperature information is used to indicate the current temperature of the sample end; a vacuum control module is used to control the vacuum device to perform a vacuum operation on the liquid helium-free temperature control device, and is used to receive pipeline pressure information and send it to the main control module, and the pipeline pressure information is used to indicate the vacuum degree in the connecting pipeline between the sample end and the refrigeration device; the main control module is electrically connected to the temperature control module and the vacuum control module respectively, and is used to indicate the pipeline pressure information when the pipeline pressure information indicates the vacuum degree in the connecting pipeline between the sample end and the refrigeration device. When the vacuum degree meets the preset vacuum condition, a refrigeration trigger instruction is sent to the temperature control module, so that the temperature control module controls the refrigeration device to perform a refrigeration operation in response to the refrigeration trigger instruction; and, based on the first temperature information and the second temperature information, the temperature control instruction currently corresponding to the refrigeration device is determined, and the temperature control instruction is sent to the temperature control module, so that the temperature control module controls the operating state of the refrigeration device based on the temperature control instruction; and the main control module is also used to respond to the remote control instruction sent by the host computer and execute the control operation corresponding to the remote control instruction; the main control module of the circuit control system of the present application can determine the temperature control instruction currently corresponding to the refrigeration device based on the first temperature information and the second temperature information received by the temperature control module, and send the temperature control instruction to the temperature control module, so that the temperature control module controls the operating state of the refrigeration device based on the temperature control instruction, thereby adjusting the temperature of the sample end within the preset temperature range, and making the liquid helium-free temperature control equipment have a high degree of automation and high accuracy of temperature control adjustment. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions and advantages in the embodiments of the present application or the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0022] Figure 1 : A structural block diagram of a circuit control system provided in an embodiment of the present application.

[0023] Figure 2 : A structural block diagram of the main control module provided in an embodiment of the present application.

[0024] Among them, the reference numerals in the figure correspond to:

[0025] 1- Main control module, 2- Temperature control module, 3- Vacuum control module, 4- Cleaning control module, 5- Alarm control module, 11- Remote interface, 12- Temperature control interface, 13- Human-computer interaction interface, 14- Sampling indicator light interface, 15- AC power interface, 16- Temperature control power interface, 17- DC power interface, 18- Vacuum pump power interface, 19- Circulation pump power interface, 20- Solenoid valve interface, 21- Vacuum pump interface, 22- Flow meter interface, 23- Multiplexer, 24- Refrigeration device interface, 25- Reserved interface, 26- Status output interface, 27- SCR circuit, 28- Vacuum gauge pressure gauge interface. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0027] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions.

[0028] The following describes the embodiments with reference to the accompanying drawings, which do not limit the application contents described in the claims.

[0029] Please refer to Figure 1-2As shown, the embodiment of the present application provides a circuit control system based on a liquid helium-free temperature control device, which is applied to the liquid helium-free temperature control device. The liquid helium-free temperature control device includes a sample end and a refrigeration device, and the sample end and the refrigeration device are connected by pipeline. The circuit control system includes: a temperature control module 2, including an information receiving unit and a refrigeration control unit, the refrigeration control unit is used to control the refrigeration device to perform a refrigeration operation, the information receiving unit is used to receive the collected first temperature information and the second temperature information, and send them to the main control module 1; the first temperature information is used to indicate the current temperature in the cold head cavity of the refrigeration device, and the second temperature information is used to indicate the current temperature of the sample end; a vacuum control module 3 is used to control the vacuum device to perform a vacuum operation on the liquid helium-free temperature control device, and is used to receive pipeline pressure information, And sent to the main control module 1, the pipeline pressure information is used to indicate the vacuum degree in the connecting pipeline between the sample end and the refrigeration device; the main control module 1 is electrically connected to the temperature control module 2 and the vacuum control module 3, respectively, and is used to send a refrigeration trigger instruction to the temperature control module 2 when the vacuum degree indicated by the pipeline pressure information meets the preset vacuum condition, so that the temperature control module 2 controls the refrigeration device to perform a refrigeration operation in response to the refrigeration trigger instruction; and, based on the first temperature information and the second temperature information, determine the temperature control instruction currently corresponding to the refrigeration device, and send the temperature control instruction to the temperature control module 2, so that the temperature control module 2 controls the operating state of the refrigeration device based on the temperature control instruction; the main control module 1 is also used to respond to the remote control instruction sent by the host computer and execute the control operation corresponding to the remote control instruction.

[0030] In the embodiment of the present application, through the close cooperation and efficient communication between the main control module 1 and the temperature control module 2 and the vacuum control module 3, comprehensive and precise control of the liquid helium-free temperature control equipment is achieved, meeting the needs of precise control of the low-temperature environment and stable operation of the equipment in scientific research and industrial applications; at the same time, through the remote communication between the host computer and the main control module 1, the user operation convenience of the equipment is improved, providing strong support for the remote management and use of the equipment.

[0031] It should be noted that the sample end of the liquid helium-free temperature control device has a sample cavity for accommodating the sample to be cooled and a sample holder for carrying the sample to be cooled; the liquid helium-free temperature control device includes a temperature control device, the temperature control device includes a refrigeration device, the refrigeration device is connected to the sample cavity through a pipeline, and the refrigeration device is used to transfer a refrigerant to the sample cavity through the pipeline, so that the temperature in the sample cavity meets the actual working temperature requirements.

[0032] Specifically, the refrigeration device may be a pulse tube refrigerator (Pu l se Tube Cryocoo ler) and a GM refrigerator (Gifford-McMahon cryocoo ler).

[0033] Specifically, the main control module 1 includes a refrigeration device interface 24, and the refrigeration device is connected to the main control module 1 via the refrigeration device interface 24; thus, the main control module 1 can control the refrigeration device by controlling the refrigeration device driving circuit.

[0034] Specifically, a first temperature acquisition device is provided in the cold head cavity of the refrigeration device for acquiring first temperature information in the cold head cavity; a second temperature acquisition device is provided in the sample end for acquiring second temperature information of the sample end.

[0035] The liquid helium-free temperature control device also includes a vacuum device, which includes a vacuum driving device and a vacuum degree collection device; the vacuum driving device is connected to the pipeline in an on-off manner; the vacuum degree collection device is used to collect pipeline pressure information and send it to the vacuum control module 3.

[0036] Specifically, the vacuum degree collecting device may be a vacuum gauge pressure gauge, and the vacuum driving device may be a vacuum pump.

[0037] The main control module 1 also includes a vacuum gauge pressure gauge interface 28 , through which the vacuum gauge pressure gauge is communicatively connected to the main control module 1 , and the vacuum degree information collected by the vacuum gauge pressure gauge 28 can be sent to the main control module 1 .

[0038] Specifically, the vacuum pump is communicatively connected to the main control module 1 via the vacuum pump interface 21 .

[0039] Furthermore, the main control module 1 is also used to respond to the vacuum pumping event and send a vacuum pumping instruction to the vacuum control module 3, thereby controlling the vacuum device to perform a vacuum pumping operation on the liquid helium-free temperature control device until the pipeline pressure information collected by the vacuum degree collection device reaches the preset vacuum degree requirement. For example, when the vacuum degree of the pipeline pressure information reaches 1X10 -5 .

[0040] Furthermore, the main control module 1 is also used to respond to a vacuum pumping event and obtain the speed information of the vacuum pump. When the vacuum degree of the pipeline pressure information reaches a preset vacuum degree requirement and the speed of the vacuum pump reaches a preset speed requirement, the main control module 1 is also used to send a vacuum holding instruction to the vacuum control module 3, thereby controlling the speed of the vacuum pump and the vacuum degree in the connecting pipeline between the sample end and the refrigeration device to be maintained within a preset time.

[0041] When the vacuum degree indicated by the pipeline pressure information meets the preset vacuum conditions, the main control module 1 is also used to send a refrigeration trigger instruction to the refrigeration control unit, so that the refrigeration control unit can control the refrigeration device to perform a refrigeration operation until the first temperature information of the cold head chamber of the refrigeration device and the second temperature information of the sample end reach their respective preset temperature requirements.

[0042] Furthermore, a circulation drive device is provided on the connecting pipeline between the sample end and the refrigeration device. When the refrigeration device performs a refrigeration operation, the main control module 1 is also used to control the start-up of the circulation drive device, thereby driving the cold medium generated by the refrigeration device to circulate continuously along the pipeline between the cold head cavity and the sample cavity, thereby realizing effective heat transfer.

[0043] Specifically, the circulation driving device may be a circulation pump. The main control module 1 further includes a circulation pump interface 19 , and the circulation pump is communicatively connected with the main control module 1 via the circulation pump interface 19 .

[0044] Specifically, the main control module 1 is also provided with a remote interface 11, which is used for remote communication connection with the host computer, so that the main control module 1 can respond to the remote control instruction sent by the host computer and execute the control operation corresponding to the remote control instruction.

[0045] For example, the host computer can send a refrigeration trigger instruction to the main control module 1, and the main control module 1 can respond to the refrigeration trigger instruction so that the temperature control module 2 controls the refrigeration device to perform a refrigeration operation in response to the refrigeration trigger instruction; thereby realizing the remote control function, so that the device has remote operability.

[0046] Furthermore, new preset temperature, preset speed, preset vacuum degree and other data can be set through the host computer, and corresponding operations can be performed according to the instructions to realize the remote control function.

[0047] Furthermore, the operating status information, temperature data (cold head chamber and sample end temperature), vacuum data, speed data and possible fault alarm information of the liquid helium-free temperature control equipment can also be transmitted to the host computer so that the host computer can perform remote monitoring and data analysis.

[0048] In some embodiments, the main control module 1 is also used to send a detection refrigeration instruction to the refrigeration control unit before the vacuum control module 3 controls the vacuum device to perform a vacuum operation; the refrigeration control unit is also used to control the refrigeration device to perform a detection refrigeration operation in response to the detection refrigeration instruction, and send the first temperature information and the second temperature information during the detection refrigeration operation to the main control module 1; the main control module 1 is also used to compare the first temperature information and the first target temperature information during the detection refrigeration operation to obtain a first comparison result, and compare the second temperature information and the second target temperature information to obtain a second comparison result; when the first comparison result and the second comparison result both meet the preset low-temperature comparison result, it is determined that the liquid helium-free temperature control device is in a low-temperature environment state, and the first target temperature information is used to indicate the target temperature to be reached in the cold head cavity during the refrigeration detection operation; the second target temperature information is used to indicate the target temperature to be reached in the sample end during the refrigeration detection operation.

[0049] Specifically, the preset low temperature comparison result may be that the first temperature information reaches the first target temperature information, and the second temperature information reaches the second target temperature information.

[0050] Specifically, before the vacuum device performs a vacuum operation, it is necessary to determine that the liquid helium-free temperature control equipment is in a low-temperature environment, that is, the temperatures of the cold head chamber and the sample chamber are both in the preset low-temperature environment, and then it is necessary to detect the temperature of the current sample chamber and the cold head chamber and the temperature in the pipeline connecting the sample chamber and the cold head chamber to make them meet the preset low-temperature environment temperature.

[0051] Specifically, before the vacuum device performs a vacuum operation, the main control module 1 sends a detection refrigeration instruction to the refrigeration control unit, and then controls the refrigeration device to perform a detection refrigeration test. During the detection refrigeration operation, the refrigeration device can generate a cold medium, and the cold medium is transferred to the sample cavity along the pipeline. When the first temperature information in the cold head cavity reaches the first target temperature information, and the second temperature information in the sample cavity reaches the second target temperature information, the temperatures of the cold head cavity and the sample cavity are both in a preset low temperature environment.

[0052] In this embodiment, before the vacuum device performs a vacuum operation, the main control module 1 sends a detection refrigeration instruction to the refrigeration control unit, thereby controlling the refrigeration device to perform a detection refrigeration operation, so that the temperatures of the cold head chamber and the sample chamber are both within a preset low temperature environment, thereby avoiding the situation where, after the temperature control device is started, stress is generated inside the device due to the rapid drop in temperature, thereby affecting the service life of the device.

[0053] In some embodiments, the temperature control module 2 also includes a heating control unit, and the liquid nitrogen-free temperature control device also includes a heating device; the main control module 1 is used to send a heating instruction to the heating control unit in response to a shutdown event of the liquid nitrogen-free temperature control device; the heating control unit is used to control the heating device to perform a heating operation in response to the heating instruction, and send the first temperature information and the second temperature information during the heating operation to the main control module 1; the main control module 1 is also used to compare the first temperature information and the first preset normal temperature information during the heating operation to obtain a first temperature comparison result; compare the second temperature information and the second preset normal temperature information to obtain a second temperature comparison result; when the first temperature comparison result and the second temperature comparison result both meet the preset normal temperature comparison result, it is determined that the liquid helium-free temperature control device is in a preset normal temperature state, the first preset normal temperature information is used to indicate the preset normal temperature that needs to be reached in the cold head cavity during the operation of the heating device, and the second preset normal temperature information is used to indicate the preset normal temperature that needs to be reached in the sample end during the operation of the heating device.

[0054] Specifically, the preset normal temperature comparison result may be that the first temperature information reaches the first preset normal temperature information, and the second temperature information reaches the second preset normal temperature information.

[0055] Specifically, the temperature control device also includes a heating device, which includes a cold cavity heating device arranged in the cold head cavity and a sample cavity heating device arranged in the sample cavity; the main control module 1 can send a heating instruction to the heating control unit in response to a shutdown event of the liquid nitrogen-free temperature control device, and then the heating control unit can control the cold head cavity heating device to perform a heating operation until the first temperature information in the cold cavity reaches the first preset normal temperature information; at the same time, the heating control unit can control the sample cavity heating device to perform a heating operation until the second temperature information in the sample cavity reaches the second preset normal temperature information.

[0056] Furthermore, the main control module 1 is used to respond to the shutdown event of the liquid nitrogen-free temperature control device, and is also used to send a vacuum device shutdown instruction to the vacuum control module 3, so that the vacuum control module 3 controls the vacuum device to shut down.

[0057] In some embodiments, a cleaning control module 4 is further included, and the liquid helium-free temperature control device also includes a purging device; the cleaning control module 4 is electrically connected to the main control module 1, and the cleaning control module 4 is used to control the purging device to perform a purging operation; the main control module 1 is used to send a purging instruction to the cleaning control module 4 when the vacuum degree indicated by the pipeline pressure information meets the preset vacuum degree condition, so that the cleaning control module 4 controls the purging device to perform a purging operation in response to the purging instruction.

[0058] Specifically, the purging device may include a circulation drive device and a helium storage device arranged on the pipeline. The air inlet end of the helium storage device can be connected to the pipeline through a connecting valve, and a vent valve is also arranged on the pipeline.

[0059] Specifically, the cleaning control module 4 can respond to the purge instruction sent by the main control module 1, control the bleed valve to close, and the connecting valve to open, so that the air inlet end of the helium storage device is connected to the pipeline, and then control the air inlet end of the helium storage device to transport a preset flow of refrigerant into the pipeline; when the helium storage device transports a preset flow of refrigerant into the pipeline, the cleaning control module 4 can control the bleed valve and the circulation drive device to start, and control the connecting valve to close, so as to discharge the refrigerant in the pipeline. When the preset purge time is reached, the cleaning control module 4 is also used to control the bleed valve and the circulation drive device to close, so as to complete a purge operation.

[0060] Specifically, the liquid nitrogen-free temperature control device further includes a flow detection device, which is used to detect the flow information of the refrigerant medium in the pipeline, and the flow detection device can be a flow meter.

[0061] Specifically, the purging effect on the pipeline can be improved by setting the number of cycles of the purging operation. For example, the number of cycles is generally 3-5 times.

[0062] In the embodiment of the present application, the cleaning control module 4 is provided to control the purging device to complete the purging operation, thereby eliminating impurities in the pipeline and in the cold head chamber and sample chamber respectively connected to the pipeline, thereby improving the temperature control effect of the equipment.

[0063] In some embodiments, the main control module 1 is also used to send a low-temperature cycle instruction to the temperature control module 2 during the refrigeration operation if it is detected that the first temperature information and the second temperature information meet the steady-state condition, and meeting the steady-state condition means that the current temperature in the cold head cavity indicated by the first temperature information and the current temperature at the sample end indicated by the second temperature information both reach the expected refrigeration state; the temperature control module 2 is also used to control the refrigeration device to perform a refrigeration cycle operation in response to the low-temperature cycle instruction.

[0064] Specifically, the first temperature information satisfies the steady-state condition, which can be understood as the current temperature in the cold head cavity reaches the first preset steady-state temperature, and the second temperature information satisfies the steady-state condition, which can be understood as the current temperature at the sample end reaches the second preset steady-state temperature; the first preset steady-state temperature and the second preset steady-state temperature can both be set according to the actual use requirements of the liquid nitrogen-free temperature control equipment.

[0065] Specifically, during the refrigeration operation, the main control module 1 is also used to compare the first temperature information and the first preset steady-state temperature to obtain a first control result; and to compare the second temperature information and the second preset steady-state temperature to obtain a second control result; and determine that the refrigeration device performs a refrigeration cycle operation based on the first control result and the second control result.

[0066] Specifically, the refrigeration device performs a refrigeration cycle operation, including performing a refrigeration operation or a heating operation, so that the first control result and the second control result both meet a preset temperature control range.

[0067] In some other embodiments, the liquid helium-free temperature control device further includes a temperature controller. A temperature control interface 12 is provided on the main control module 1 , and the main control module 1 is communicatively connected to the temperature controller via the temperature control interface 12 .

[0068] Specifically, a first preset steady-state temperature and a second preset steady-state temperature can be set through the temperature controller. The temperature controller is also used to compare the first temperature information and the first preset steady-state temperature to obtain a first control result, and to compare the second temperature information and the second preset steady-state temperature to obtain a second control result; and send the first control result and the second control result to the main control module 1. The main control module 1 sends a low-temperature cycle instruction to the temperature control module 2 according to the first control result and the second control result, and then the temperature control module 2 controls the refrigeration device to perform a refrigeration cycle operation, so that the first control result and the second control result both meet the preset temperature control range.

[0069] In the embodiment of the present application, by setting up a temperature controller, the temperature controller is communicated with the main control module 1, so that the sample end temperature and the cold head cavity temperature of the liquid helium-free temperature control device can be dynamically controlled, and the current temperature of the sample end temperature and the cold head cavity temperature can be maintained to reach the expected refrigeration state, thereby ensuring the accuracy and stability of the temperature control of the liquid helium-free temperature control device, and achieving deep cooling of the target sample or material.

[0070] In some embodiments, a first cold head and a second cold head are arranged in a cold head cavity of a refrigeration device; the sample end includes a sample cavity and a sample holder arranged in the sample cavity; the first temperature information includes a first temperature and a second temperature, the first temperature is used to indicate the current temperature of the first cold head in the cold head cavity of the refrigeration device, and the second temperature is used to indicate the current temperature of the second cold head in the cold head cavity of the refrigeration device; the second temperature information includes a third temperature and a fourth temperature, the third temperature is used to indicate the current temperature of the sample cavity of the sample end, and the fourth temperature is used to indicate the current temperature of the sample holder of the sample end; satisfying the steady-state condition means that the current temperature of the first cold head indicated by the first temperature and the current temperature of the second cold head indicated by the second temperature both reach the expected refrigeration state of their respective cold head ends; and the current temperature of the sample cavity of the sample end indicated by the third temperature and the current temperature of the sample holder of the sample end indicated by the fourth temperature both reach the expected refrigeration state of the sample end.

[0071] Specifically, the first cold head and the second cold head are arranged along the cold head cavity, and the first temperature collection device includes a first temperature sensor and a second temperature sensor. The first temperature sensor is arranged near the first cold head and is used to collect the first temperature at the first cold head; the second temperature sensor is arranged near the second cold head and is used to collect the second temperature at the second cold head.

[0072] Specifically, the second temperature acquisition device includes a third temperature sensor and a fourth temperature sensor. The third temperature sensor is arranged in the sample cavity for acquiring a third temperature in the sample cavity; the fourth temperature sensor is arranged on the sample holder for acquiring a fourth temperature on the sample holder.

[0073] In the embodiment of the present application, by arranging the first cold head and the second cold head in the cold head cavity, the cooling efficiency of the equipment can be improved, so that the temperature in the cold head cavity quickly reaches the expected cooling state, and at the same time, the first temperature at the first cold head is collected by the first temperature sensor, the second temperature at the second cold head is collected by the second temperature sensor, and the third temperature in the sample cavity is collected by the third temperature sensor, and the fourth temperature on the sample holder is collected by the fourth temperature sensor, thereby improving the accuracy and efficiency of the temperature control of the current temperature of the sample end and the current temperature in the cold head cavity by the main control module 1.

[0074] In other embodiments, three or more cold heads may be disposed in the cold head cavity, as well as a temperature sensor device for collecting the temperature at the cold heads, which can further improve the refrigeration efficiency.

[0075] In some embodiments, the main control module 1 also includes a human-computer interaction interface 13, and the liquid helium-free temperature control device also includes an interactive device; the main control module 1 is communicatively connected to the interactive device through the human-computer interaction interface 13, and is used to respond to the interactive control instructions sent by the interactive device and execute the interactive control operations corresponding to the interactive control instructions.

[0076] Specifically, the interactive device can be an interactive touch liquid crystal display device, which is connected to the main control module 1 through the human-computer interaction interface 13. Interactive control instruction buttons and step information of the current running instruction are displayed on the main interface of the interactive touch liquid crystal display device. The interactive control instruction buttons include a standby instruction button, a cooling instruction button, a sampling instruction button, a layout instruction button, and a shutdown instruction button, etc. The user can send the corresponding interactive control instruction to the main control module 1 by clicking the instruction button on the interactive touch liquid crystal display device, thereby realizing the corresponding interactive control operation of the liquid helium-free temperature control device.

[0077] It should be noted that when the user clicks the standby instruction button, the interactive touch liquid crystal display device can send a standby instruction to the main control module 1, and the main control module 1 responds to the standby instruction and can control the liquid helium-free temperature control device to perform the corresponding standby operation; when the user clicks the cooling instruction button, the interactive touch liquid crystal display device can send a cooling instruction to the main control module 1, and the main control module 1 responds to the cooling instruction and can control the liquid helium-free temperature control device to perform the corresponding cooling operation, and the cooling operation includes but is not limited to controlling the refrigeration device to perform a detection refrigeration operation, controlling the vacuum device to perform a vacuum operation, controlling the purge device to perform a purge operation, and controlling the refrigeration device to perform a refrigeration cycle operation.

[0078] Furthermore, the main control module 1 is also used to obtain the operating status information of the liquid helium-free temperature control device and send the operating status information to the interactive touch liquid crystal display device, so that the interactive touch liquid crystal display device can display the operating status of the liquid helium-free temperature control device based on the operating status information.

[0079] Specifically, the operating status information of the liquid helium-free temperature control device may include but is not limited to the standby status information of the device, shutdown status information, temperature information in the cold head cavity, temperature information at the sample end, and vacuum degree information in the pipeline.

[0080] Specifically, for the temperature information at the sample end, the interactive touch liquid crystal display device can present the temperature value and change curve in digital and / or graphical form, so that users can intuitively observe the real-time status and historical change trend of the sample temperature.

[0081] In the embodiment of the present application, a human-computer interaction interface 13 is set on the main control module 1, and then the human-computer interaction interface 13 is used to communicate with the interactive touch liquid crystal display device, so that the interactive touch liquid crystal display device can intuitively present the operating status information of the device and the temperature information in the sample end, so that the user can understand the working status of the device in real time; at the same time, the user can also perform parameter setting, device control (such as start, stop, temperature adjustment, etc.) and view detailed device operation data records and historical curves on the interactive touch liquid crystal display device through touch operations, thereby improving the convenience of device operation and human-computer interactivity.

[0082] In some embodiments, the vacuum control module 3 is also used to obtain the rotational speed information of the vacuum device and send it to the main control module 1; the main control module 1 is also used to send sampling prompt information to the interactive device when the temperature indicated by the second temperature information reaches a preset sampling temperature and the rotational speed information meets the preset sampling speed conditions, so that the interactive device displays the sampling prompt information.

[0083] Specifically, when the user clicks the sampling button, the interactive touch LCD display device can send a sampling instruction to the main control module 1, and then the main control module 1 controls the speed of the vacuum device to meet the preset sampling speed conditions in response to the sampling instruction, and at the same time controls the refrigeration device to perform the corresponding sampling refrigeration operation until the temperature at the sample end reaches the preset sampling temperature.

[0084] Specifically, when the temperature at the sample end reaches the preset sampling temperature and the speed of the vacuum device meets the preset sampling speed conditions, the main control module 1 can send sampling prompt information to the interactive touch LCD display device, and then the interactive touch LCD display device can prompt the user to take out the sample by displaying the sampling prompt light.

[0085] Specifically, a sampling indicator light interface 14 is provided on the main control module 1, and the liquid nitrogen-free temperature control device also includes an LED prompt light, which is electrically connected to the main control module 1 through the sampling indicator light interface 14. Then, the main control module 1 can control the start of the LED prompt light by sending sampling prompt information to the sampling indicator light driving circuit to prompt the customer that sampling is possible.

[0086] In other embodiments, when the user clicks the layout button, the interactive touch liquid crystal display device can send a layout instruction to the main control module 1, and the main control module 1 can be used to respond to the layout instruction and send a layout prompt information to the interactive touch liquid crystal display device, so that the interactive device displays the layout prompt information. Furthermore, the interactive touch liquid crystal display device can prompt the user to put in the sample by displaying a layout prompt light.

[0087] Specifically, the main control module 1 is also used to respond to the user completing the sampling operation, and the main control module 1 is also used to send a state recovery instruction to the vacuum control module 3 and the temperature control module 2, and then the vacuum control module 3 is used to control the vacuum device so that its speed information speed meets the preset state speed, and the temperature control module 2 controls the refrigeration device to perform the corresponding sampling refrigeration operation until the temperature of the sample end reaches the preset state temperature.

[0088] In other embodiments, when the user clicks the shutdown button, the interactive touch liquid crystal display device can send a shutdown command to the main control module 1, and the main control module 1 can be used to respond to the shutdown command to control the liquid nitrogen-free temperature control device to perform a shutdown operation; the shutdown operation includes but is not limited to controlling the circulation drive device, the refrigeration device, and the vacuum device to be turned off, and the system is now completely in a shutdown state.

[0089] In some embodiments, an alarm control module 5 is further included, and the liquid helium-free temperature control device also includes an alarm device. The alarm control module 5 is electrically connected to the main control module 1; the main control module 1 is also used to perform fault detection based on the operating status information of the liquid helium-free temperature control device and generate a fault detection result; if the fault detection result indicates that there is an equipment failure event, a fault alarm signal is sent to the alarm control module 5; the alarm control module 5 is used to control the alarm device to release the fault alarm information in response to the fault alarm signal.

[0090] Specifically, the alarm device may be a buzzer; one end of the alarm control module 5 is electrically connected to the buzzer, and the other end is electrically connected to the main control module 1 .

[0091] Furthermore, the main control module 1 can also perform fault detection based on the operating status information of the liquid helium-free temperature control equipment, analyze the equipment parameters and working conditions, and generate fault detection results; when the fault detection results indicate that there is an equipment failure event, the main control module 1 immediately sends a fault alarm signal to the alarm control module 5, triggering the alarm mechanism of the alarm control module 5, and then controlling the buzzer to release the fault alarm signal so that the operator can take countermeasures in time.

[0092] Specifically, after receiving the fault alarm signal, the alarm control module 5 displays the fault alarm information through a display screen or sound prompts, etc., to remind the operator to pay attention and take corresponding measures to ensure the safe operation of the equipment.

[0093] In an embodiment of the present application, by setting the alarm control module 5 to be electrically connected to the main control module 1, a fault detection result can be generated according to the main control module 1, triggering the alarm mechanism of the alarm control module 5, and then an alarm prompt sound signal can be issued to remind the user to pay attention to the operating status and potential problems of the equipment, thereby ensuring the normal operation of the equipment and the safety of the user.

[0094] In some embodiments, the main control module 1 includes an AC power interface 15, a temperature control power interface 16, a vacuum pump power interface 18, a circulating pump power interface 19, and a solenoid valve interface 20; the AC power interface 15 is used to connect to an external power supply; the temperature control power interface 16, the vacuum pump power interface 18, and the circulating pump power interface 19 are connected to the main control module 1 and the AC power interface 15 respectively, and the main control module 1 can send control instructions to control the on / off connection of the thyristor circuit 27 and the AC power interface 15, the temperature control power interface 16, the vacuum pump power interface 18, the circulating pump power interface 19 or the solenoid valve interface 20.

[0095] Specifically, the solenoid valve interface 20 is used to connect with the connecting valve and the air release valve, and then control the opening and closing of the connecting valve or the air release valve through the main control module.

[0096] Specifically, the main control module 1 includes a DC power interface 17, which is electrically connected to the main control module through a low voltage difference linear regulator (LDO). The DC power interface 17 is used to receive an external DC power supply and then stabilize and adjust the voltage through the LDO; the stable power after LDO processing is then connected to the main control module 1 to provide the required stable operation for the main control module 1.

[0097] Specifically, the main control module 1 is also provided with a vacuum pump interface 21 and a flow meter interface 22. The main control module 1 also includes a multiplexer 23. The first communication end of the multiplexer 23 is used to communicate with the main control module 1 through a serial interface, and the second communication end of the multiplexer 23 is driven by RS485 for parallel connection with the vacuum pump interface 21, the flow meter interface 22 and the temperature control interface 12.

[0098] Specifically, the multiplexer 23 can connect the TTL serial port signal of the main control module 1 to the serial port of each communication module through the channel selection of A and B, and control the high and low level switching switches of A and B to communicate with each module through polling of the main control module 1, thereby realizing efficient utilization of the limited serial port resources of the main control module 1, thereby improving the flexibility and scalability of the system and reducing the overall cost.

[0099] The flow meter is connected to the main control module 1 via the flow meter interface 22, so that the flow information collected by the flow meter can be sent to the main control module.

[0100] Specifically, the main control module 1 also includes a status output interface 26; the main control module 1 is connected in parallel to the human-computer interaction interface 13, the temperature control interface 12, the remote interface 11 and the status output interface 26 through RS232 drive; thereby, real-time display and control of the system status can be achieved, the scalability and flexibility of the system are improved, and the overall cost and complexity are reduced.

[0101] Specifically, the status output interface 26 is used to connect to a display device, and the operating status of the device can be viewed through the display device.

[0102] In some embodiments, the main control module 1 further includes a storage medium; the storage medium is in communication connection with the main control module 1, and the storage medium is used to store configuration information, device parameters, and data information that needs to be retained after power failure.

[0103] Specifically, the storage medium may be an EEPROM.

[0104] Specifically, the main control module 1 also includes a reserved interface 25, which is used for system external device redundancy, so that the system can easily access various external devices, such as sensors, actuators or other control systems, to facilitate system expansion and upgrading, and can also meet changing needs in different application scenarios.

[0105] The various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referenced to each other, and each embodiment focuses on the differences from other embodiments.

[0106] It should be noted that all the features recorded in this application (including technical features recorded in different embodiments) can be combined arbitrarily under reasonable circumstances, and new technical solutions formed by the combination are all within the protection scope of this application.

[0107] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A circuit control system based on a liquid helium-free temperature control device, applied to a liquid helium-free temperature control device, wherein the liquid helium-free temperature control device comprises a sample end and a refrigeration device, wherein the sample end and the refrigeration device are connected by a pipeline, and characterized in that: The circuit control system comprises: The temperature control module includes an information receiving unit and a refrigeration control unit, wherein the refrigeration control unit is used to control the refrigeration device to perform a refrigeration operation, and the information receiving unit is used to receive the collected first temperature information and second temperature information, and send them to the main control module; the first temperature information is used to indicate the current temperature in the cold head cavity of the refrigeration device, and the second temperature information is used to indicate the current temperature of the sample end; A vacuum control module, used to control the vacuum device to evacuate the liquid helium-free temperature control device, and to receive pipeline pressure information and send it to the main control module, wherein the pipeline pressure information is used to indicate the vacuum degree in the connecting pipeline between the sample end and the refrigeration device; a main control module, electrically connected to the temperature control module and the vacuum control module, respectively, for sending a refrigeration trigger instruction to the temperature control module when the vacuum degree indicated by the pipeline pressure information satisfies a preset vacuum condition, so that the temperature control module controls the refrigeration device to perform the refrigeration operation in response to the refrigeration trigger instruction; and determining the temperature control instruction currently corresponding to the refrigeration device based on the first temperature information and the second temperature information, and sending the temperature control instruction to the temperature control module, so that the temperature control module controls the operating state of the refrigeration device based on the temperature control instruction; The main control module is also used to respond to the remote control instruction sent by the host computer and execute the control operation corresponding to the remote control instruction.

2. The circuit control system according to claim 1, characterized in that: The main control module is also used to send a refrigeration detection instruction to the refrigeration control unit before the vacuum control module controls the vacuum device to perform a vacuum operation; The refrigeration control unit is further used to control the refrigeration device to perform a detection refrigeration operation in response to the detection refrigeration instruction, and send first temperature information and second temperature information during the detection refrigeration operation to the main control module; The main control module is also used to compare the first temperature information and the first target temperature information to obtain a first comparison result, and to compare the second temperature information and the second target temperature information to obtain a second comparison result during the detection refrigeration operation; when the first comparison result and the second comparison result both meet the preset low-temperature comparison result, it is determined that the liquid helium-free temperature control device is in a low-temperature environment state, and the first target temperature information is used to indicate the target temperature to be reached in the cold head cavity during the refrigeration detection operation; the second target temperature information is used to indicate the target temperature to be reached in the sample end during the refrigeration detection operation.

3. The circuit control system according to claim 1, characterized in that: The temperature control module further includes a heating control unit, and the liquid nitrogen-free temperature control device further includes a heating device; the main control module is used to send a heating instruction to the heating control unit in response to a shutdown event of the liquid nitrogen-free temperature control device; the heating control unit is used to control the heating device to perform a heating operation in response to the heating instruction, and send first temperature information and second temperature information during the heating operation to the main control module; the main control module is also used to compare the first temperature information with the first preset normal temperature information during the heating operation to obtain a first temperature comparison result; and compare the second temperature information with the second preset normal temperature information to obtain a second temperature comparison result; When the first temperature comparison result and the second temperature comparison result both meet the preset normal temperature comparison result, it is determined that the liquid helium-free temperature control device is in a preset normal temperature state, the first preset normal temperature information is used to indicate the preset normal temperature that needs to be reached in the cold head cavity during the operation of the heating device, and the second preset normal temperature information is used to indicate the preset normal temperature that needs to be reached in the sample end during the operation of the heating device.

4. The circuit control system according to claim 1, characterized in that: It also includes a cleaning control module, and the liquid helium-free temperature control device also includes a purge device; The cleaning control module is electrically connected to the main control module, and the cleaning control module is used to control the purge device to perform a purge operation; The main control module is used to send a purge instruction to the cleaning control module when the vacuum degree indicated by the pipeline pressure information meets the preset vacuum degree condition, so that the cleaning control module controls the purge device to perform a purge operation in response to the purge instruction.

5. The circuit control system according to claim 1, characterized in that: The main control module is also used to send a low temperature cycle instruction to the temperature control module during the refrigeration operation if it is detected that the first temperature information and the second temperature information meet a steady-state condition, wherein meeting the steady-state condition means that the current temperature in the cold head cavity indicated by the first temperature information and the current temperature at the sample end indicated by the second temperature information both reach an expected refrigeration state; The temperature control module is further used to control the refrigeration device to perform a refrigeration cycle operation in response to the low temperature cycle instruction.

6. The circuit control system according to claim 5, characterized in that: The cold head cavity of the refrigeration device is provided with a first cold head and a second cold head; the sample end includes a sample cavity and a sample holder provided in the sample cavity; The first temperature information includes a first temperature and a second temperature, the first temperature is used to indicate the current temperature of the first cold head in the cold head cavity of the refrigeration device, and the second temperature is used to indicate the current temperature of the second cold head in the cold head cavity of the refrigeration device; The second temperature information includes a third temperature and a fourth temperature, the third temperature is used to indicate the current temperature of the sample cavity of the sample end, and the fourth temperature is used to indicate the current temperature of the sample holder of the sample end; Satisfying the steady-state condition means that the current temperature of the first cold head indicated by the first temperature and the current temperature of the second cold head indicated by the second temperature both reach the expected cooling state of their respective cold head ends; and the current temperature of the sample cavity of the sample end indicated by the third temperature and the current temperature of the sample holder of the sample end indicated by the fourth temperature both reach the expected cooling state of the sample end.

7. The circuit control system according to claim 1, characterized in that: The main control module further includes a human-computer interaction interface, and the liquid helium-free temperature control device further includes an interaction device; The main control module is communicatively connected with the interactive device via the human-computer interaction interface, and is used for responding to the interactive control instruction sent by the interactive device and executing the interactive control operation corresponding to the interactive control instruction.

8. The circuit control system according to claim 7, characterized in that: The main control module is also used to obtain the operating status information of the liquid helium-free temperature control device and send the operating status information to the interactive device; The interactive device is used to display the operating status of the liquid helium-free temperature control device based on the operating status information.

9. The circuit control system according to claim 7, characterized in that: The vacuum control module is also used to obtain the rotation speed information of the vacuum device and send it to the main control module; The main control module is also used to send sampling prompt information to the interactive device when the temperature indicated by the second temperature information reaches a preset sampling temperature and the rotation speed information meets a preset sampling rotation speed condition, so that the interactive device displays the sampling prompt information.

10. The circuit control system according to claims 1-9, characterized in that: It also includes an alarm control module, which is electrically connected to the main control module; the main control module is also used to perform fault detection based on the operating status information of the liquid helium-free temperature control device and generate a fault detection result; if the fault detection result indicates that there is a device failure event, a fault alarm signal is sent to the alarm control module; The alarm control module is used for controlling the alarm device to release fault alarm information in response to the fault alarm signal.

Images