CN110849008A

CN110849008A - Refrigerating system and refrigerating method thereof

Info

Publication number: CN110849008A
Application number: CN201911212055.8A
Authority: CN
Inventors: 张波
Original assignee: Jiangsu Tomilo Environmental Testing Equipment Co Ltd
Current assignee: Jiangsu Tomilo Environmental Testing Equipment Co Ltd
Priority date: 2019-12-02
Filing date: 2019-12-02
Publication date: 2020-02-28

Abstract

The invention provides a refrigeration system and a refrigeration method thereof, wherein the system comprises: the cold bypass pipeline and the air bypass pipeline are connected in parallel in the main pipeline; the main pipeline is sequentially provided with a compressor, a condenser, a main throttle valve, a main electromagnetic valve and an evaporator; a cold bypass capillary tube is arranged in the cold bypass pipeline, one end of the cold bypass capillary tube is connected with a low-pressure port of the compressor in parallel, the other end of the cold bypass capillary tube is connected with a cold bypass electromagnetic valve, and the cold bypass electromagnetic valve is connected in the main pipeline in parallel; the air bypass pipeline is internally provided with an air bypass capillary tube, one end of the air bypass capillary tube is connected with a low-pressure port of the compressor in parallel, the other end of the air bypass capillary tube is connected with an air bypass electromagnetic valve, and the air bypass electromagnetic valve is connected in parallel in the main pipeline. The accurate pressure compensation and cooling of the compressor are realized, and the stability of the compressor is improved.

Description

Refrigerating system and refrigerating method thereof

Technical Field

The invention belongs to the technical field of environmental test equipment, and particularly relates to a refrigerating system and a refrigerating method thereof.

Background

The test box in the environmental test equipment, which relates to the constant medium-low temperature or low-temperature damp-heat state, usually adopts a PRO (pulse width modulation) control method, and the main principle of the control method is as follows: when the temperature/humidity point is constant, the heater does not participate in working in the low-temperature working state, the flow of the refrigerant entering the evaporator is controlled and adjusted through the PID + PRO technology, and meanwhile, the three-way flow adjustment is automatically carried out on the refrigeration pipeline, the cold bypass pipeline and the air bypass pipeline, so that the automatic constant of the temperature of the working chamber is realized. However, when the required refrigeration capacity of the system is particularly small, the flow rate of the refrigeration pipeline is extremely small, in order to meet the basic suction capacity required by the operation of the compressor, the cold side and gas side pipelines can supplement pressure to the suction end, the pressure supplementing valve is generally a mechanical valve, under the conditions of different condensing pressures (environment temperature/water temperature), the deviation of the pressure supplementing quantity is very large (the pressure supplementing is more when the condensing pressure is high, and the pressure supplementing is less when the condensing pressure is low), and the thermal expansion valve adopted by the cold side is difficult to meet the whole-process suitability when the test temperature range is too large (such as-70 ℃ to +150 ℃), the situations that the cooling quantity of a high-temperature section is insufficient, the liquid return quantity of a low-temperature section is too large can occur, and the operation stability (suction and exhaust pressure/suction and exhaust temperature) of the compressor and the fluctuation degree of a test box can be.

Disclosure of Invention

The embodiment of the invention aims to provide a refrigeration system and a refrigeration method thereof, which realize the automatic control of refrigeration and improve the stability of the system.

In one aspect, an embodiment of the present invention provides a refrigeration system, including: the cold bypass pipeline and the air bypass pipeline are connected in parallel in the main pipeline;

the main pipeline is sequentially provided with a compressor, a condenser, a main throttle valve, a main electromagnetic valve and an evaporator;

a cold bypass capillary tube is arranged in the cold bypass pipeline, one end of the cold bypass capillary tube is connected with a low-pressure port of the compressor in parallel, the other end of the cold bypass capillary tube is connected with a cold bypass electromagnetic valve, and the cold bypass electromagnetic valve is connected in the main pipeline in parallel;

the air bypass pipeline is internally provided with an air bypass capillary tube, one end of the air bypass capillary tube is connected with a low-pressure port of the compressor in parallel, the other end of the air bypass capillary tube is connected with an air bypass electromagnetic valve, and the air bypass electromagnetic valve is connected in parallel in the main pipeline.

Optionally, an oil separator is further disposed in the main pipeline, the oil separator is disposed between the compressor and the condenser, and the gas-side electromagnetic valve is connected in parallel to an output port of the oil separator.

Optionally, an accumulator is further disposed in the main pipeline, and the accumulator is disposed between the condenser and the main solenoid valve and is configured to store the liquid refrigerant output by the condenser.

Optionally, a dry filter is further disposed in the main pipeline, and the dry filter is configured to filter impurities and/or moisture in the refrigerant.

Optionally, the cold side electromagnetic valve is configured to be opened when the compressor discharge temperature is higher than a preset safety threshold upper limit, and be closed when the compressor discharge temperature is lower than a preset safety threshold lower limit;

the gas-side electromagnetic valve is used for being opened when the refrigerating output quantity of the refrigerating system is smaller than the preset refrigerating output quantity.

Optionally, the main path solenoid valve, the cold side solenoid valve, and the gas side solenoid valve all adopt pulse type solenoid valves.

In another aspect, the present invention provides a method for refrigerating with a refrigeration system, where a flow control valve of a cold bypass pipeline in the refrigeration system is a gas bypass capillary and a gas bypass electromagnetic valve connected to each other, the method including:

the pulse width regulation technology and the PID algorithm are utilized to control the on-off of a main solenoid valve in the refrigeration system and control the flow of the refrigerant entering an evaporator so as to realize the refrigeration function;

when the refrigerating output quantity of the refrigerating system is smaller than the preset refrigerating output quantity, closing the main path electromagnetic valve and opening a gas bypass electromagnetic valve in the gas bypass pipeline;

and the gas bypass capillary tube is utilized to divide a part of the gaseous refrigerant at the exhaust end of the compressor and directly return to the low-pressure end of the compressor, so that the pressure of the compressor is supplemented.

Optionally, the flow control valve in the cold bypass pipeline in the refrigeration system adopts a cold bypass capillary and a cold bypass electromagnetic valve which are connected with each other, and the method further includes:

when the exhaust temperature of the compressor is higher than the upper limit of a preset safety threshold, a cold bypass electromagnetic valve in the cold bypass pipeline is opened;

the condensed liquid refrigerant is converted into low-temperature and low-pressure refrigerant liquid through throttling expansion by using a cold side capillary tube, and the compressor is cooled;

and when the exhaust temperature of the compressor is lower than the lower limit of a preset safety threshold, closing the cold side electromagnetic valve.

Optionally, the method further includes:

and collecting the suction and exhaust pressure of the compressor by using a pressure sensor, and opening the gas-side electromagnetic valve to supplement the pressure to the compressor when the collected suction pressure of the compressor is less than or equal to 0.

In yet another aspect, the present invention provides an environmental test chamber, comprising: the system comprises a test chamber and a refrigeration system, wherein the refrigeration system is used for controlling the stability of the test chamber, and comprises the system recorded above.

According to the refrigeration system and the refrigeration method thereof, the mechanical flow regulating valves in the cold bypass pipeline and the air bypass pipeline are replaced by the capillary tubes, the pulse type electromagnetic valves are arranged on the capillary tubes, automatic cooling and pressure compensation can be performed on the compressor in the main pipeline, the deviation of the pressure compensation amount is small, accurate pressure compensation and cooling on the compressor are achieved, the stability of the compressor is improved, the stability of the refrigeration system is further improved, and the service life of the refrigeration system is further prolonged.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, it is obvious that the drawings in the following description are only some embodiments described in the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a schematic diagram of the principle construction of a refrigeration system in accordance with one embodiment of the present invention;

FIG. 2 is a schematic flow diagram of a method for controlling the operating conditions of a refrigeration system according to an embodiment of the present invention;

FIG. 3 is a flow chart illustrating a condition stabilizing control for a refrigerant system in accordance with another embodiment of the present invention.

Detailed Description

In order to make those skilled in the art better understand the technical solution of the present invention, the technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the drawings in the embodiment of the present invention, and it is obvious that the described embodiment is only a part of the embodiment of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The refrigeration system in the embodiment of the invention can be applied to environmental test equipment, and can provide a constant temperature or constant 2-humidity test environment for the environmental test equipment, such as a constant low temperature or low temperature damp and hot state for the environmental test equipment. Generally, the refrigeration principle of a refrigeration system is that a compressor sucks low-temperature and low-pressure refrigerant vapor generated by an evaporator into a cylinder, the refrigerant vapor is compressed by the compressor, and when the pressure is increased (the temperature is also increased) to be slightly higher than the pressure in a condenser, high-pressure refrigeration vapor in the cylinder is discharged into the condenser. The high-temperature and high-pressure refrigerant vapor in the condenser exchanges heat with air (or normal-temperature water) with lower temperature to be condensed into liquid refrigerant, and the liquid refrigerant is cooled (reduced in pressure) by an expansion valve and then enters an evaporator, and the liquid refrigerant is vaporized after absorbing the heat of an object to be cooled in the evaporator. Thus, the cooled object is cooled and the refrigerant vapor is sucked away by the compressor, so that a cycle is completed in the refrigerating system through four processes of compression, condensation, expansion and evaporation.

It should be noted that, the refrigeration system in the embodiment of the present invention may also be used for heating, during heating, high-temperature and high-pressure superheated steam compressed by the compressor is discharged from the exhaust port of the compressor, and then directly sent to the evaporator of the indoor unit through the four-way valve by connecting the pipes of the indoor evaporator, at this time, the evaporator of the indoor unit acts as a condenser, the superheated steam dissipates heat through the heat exchanger of the indoor unit, and the dissipated heat is blown out from the air port by the cross-flow fan.

Fig. 1 is a schematic structural view of a refrigeration system according to an embodiment of the present invention, and as shown in fig. 1, the refrigeration system according to an embodiment of the present invention may include: the main pipeline comprises a main pipeline, a cold bypass pipeline and an air bypass pipeline, wherein the cold bypass pipeline and the air bypass pipeline are connected in parallel in the main pipeline, namely the cold bypass pipeline and the air bypass pipeline can be understood as two branches of the main pipeline.

As shown in fig. 1, a compressor 1 is arranged in the main path pipeline, a condenser 3 is arranged behind the compressor 1, a main path electromagnetic valve 9 and a main path throttle valve 8 are arranged behind the condenser 3, an evaporator 12 is connected behind the main path throttle valve 8, and the other end of the evaporator 12 is connected with the compressor 1 to form a closed loop main path pipeline. The compressor 1 may be configured to compress a low-temperature low-pressure refrigerant gas into a high-temperature high-pressure refrigerant gas, and the condenser 3 may be configured to convert the high-temperature high-pressure refrigerant gas output by the compressor 1 into a normal-temperature high-pressure refrigerant liquid by heat exchange with air. The main throttle 8 may be used to convert the condensed liquid refrigerant into a low-temperature low-pressure refrigerant liquid through throttling expansion, and the evaporator 12 is used to cool down a working room or a laboratory facility. The evaporator 12 may perform heat exchange between the throttled low-temperature and low-pressure refrigerant liquid and the working chamber by forced air circulation, and the liquid refrigerant is evaporated to become low-temperature and low-pressure refrigerant gas and returns to the low-pressure end of the compressor 1. The main solenoid valve 9 can control the on-off of the pulse type solenoid valve by a PRO (store width adjustment) technology according to the difference between the actual temperature of the working chamber and the set temperature, thereby controlling the flow of the refrigerant entering the evaporator 12 and finally achieving the purpose of constant temperature/constant humidity without heating.

As shown in fig. 1, a cold bypass capillary tube 7 and a cold bypass solenoid valve 10 are arranged in the cold bypass pipeline, the cold bypass capillary tube 7 is connected to a low pressure port of the compressor 1, and the low pressure port is a port of the compressor, which can be specifically seen from fig. 1. The cold side solenoid valve 10 is connected in the pipeline behind the condenser 3. The cold side capillary tube 7 can be used for converting the liquid refrigerant condensed by the condenser 3 into low-temperature and low-pressure refrigerant liquid through throttling expansion, and cooling the compressor 1. The cold side electromagnetic valve 10 can be opened and closed to control whether liquid refrigerant passes through the cold side capillary 7, and further control whether the cold side pipeline is used for cooling the compressor 1. In some embodiments of the present invention, the cold side electromagnetic valve 10 may be opened when the exhaust temperature of the compressor 1 is higher than the upper limit of the preset safety threshold, the cold side capillary 7 is used to cool the compressor 1, and the cold side electromagnetic valve 10 is closed when the exhaust temperature of the compressor 1 is lower than the lower limit of the preset safety threshold, at this time, the temperature of the compressor 1 may be considered to be within the safety range, and the compressor 1 does not need to be cooled. The exhaust temperature based on the compressor controls the opening and closing of the cold side electromagnetic valve, so that the automatic control of the cooling of the compressor is realized, and the problem that the temperature of the compressor is too high to cause system failure or poor refrigeration effect is avoided. The specific values of the upper limit and the lower limit of the preset safety threshold may be set according to actual needs, and embodiments of the present invention are not limited specifically.

As shown in fig. 1, a gas bypass capillary tube 6 and a gas bypass solenoid valve 11 are arranged in a gas bypass pipeline, the gas bypass capillary tube 6 is connected to a low-pressure port of the compressor 1, and the gas bypass solenoid valve 11 is connected to a pipeline between the compressor 1 and the condenser 3. The gas bypass capillary tube 6 can be used for shunting a part of gaseous refrigerant at the exhaust end (namely a high-pressure port) of the compressor 1 and directly returning the part of the gaseous refrigerant to the low-pressure end of the compressor, and the low-pressure end of the compressor is supplemented with pressure according to the return gas pressure of the compressor 1, so that negative pressure of the system is prevented. The gas bypass electromagnetic valve 11 can be used for controlling whether the gas bypass capillary tube 6 supplements the pressure of the compressor 1 or not by being switched on or off. In some embodiments of the present invention, the logical control mode of the gas-bypass electromagnetic valve 11 may be set as a control mode of inverse logic with the refrigeration main-path liquid-supply electromagnetic valve, when the refrigeration output is extremely small, such as smaller than the refrigeration capacity, the main-path liquid-supply electromagnetic valve 9 is closed, and the gas-bypass electromagnetic valve 11 may be opened, so as to implement pressure compensation for the compressor 1 by using the gas-bypass pipeline.

As shown in fig. 1, in the embodiment of the present invention, pulse-type solenoid valves may be used as the main-path liquid supply solenoid valve in the main-path pipeline, the cold bypass solenoid valve in the cold bypass pipeline, and the gas bypass solenoid valve in the gas bypass pipeline, instead of the existing ordinary solenoid valves, and the number of times of the pulse-type solenoid valves may reach 800 ten thousand or more, which may result in a service life of 8 to 16 years, which may completely meet the control requirements of the system, perform well in the actual operation test, and may improve the stability and service life of the system.

According to the refrigeration system provided by the embodiment of the invention, the mechanical flow regulating valves in the cold bypass pipeline and the air bypass pipeline are replaced by the capillary tubes, and the pulse type electromagnetic valves are arranged on the capillary tubes, so that the automatic cooling and pressure supplementing of the compressor in the main pipeline can be realized, the deviation of the pressure supplementing quantity is small, the accurate pressure supplementing and cooling of the compressor are realized, the stability of the compressor is improved, and the stability and the service life of the refrigeration system are further improved.

On the basis of the above embodiments, as shown in fig. 1, in some embodiments of the present invention, an oil separator 2 is further disposed in the main pipeline, the oil separator 2 is disposed between the compressor 1 and the condenser 3, and the air bypass solenoid valve 11 in the air bypass pipeline may be connected in parallel to the output port of the oil separator 2. The oil separator 2 can be used for separating lubricating oil in the refrigerant output by the compressor 1 and returning the lubricating oil to an oil cavity of the compressor 1, so that energy is provided for the lubrication of the compressor, and the energy is saved.

On the basis of the above embodiments, as shown in fig. 1, in some embodiments of the present invention, an accumulator 4 is further disposed in the main pipeline, the accumulator 4 may be disposed between the condenser 3 and the main solenoid valve 9, and the accumulator 4 may be used to store the liquid refrigerant output by the condenser 3 to prevent the liquid refrigerant from entering the throttling device.

In addition, as shown in fig. 1, a dry filter 5 may be further disposed behind the accumulator 4, and the dry filter 5 may be used to filter impurities and/or moisture in the refrigerant, so as to further prevent the liquid refrigerant from entering the throttling device.

Of course, the refrigeration system may further include other devices or apparatuses according to actual use requirements, and the embodiment of the present invention is not particularly limited.

In addition, the control of the solenoid valve in the embodiment of the present invention may be controlled by a computer program, or may be controlled by a logic circuit, a pulse, or the like, and the embodiment of the present invention is not particularly limited.

Fig. 2 is a schematic flow chart of a method for controlling a working condition of a refrigeration system in an embodiment of the present invention, as shown in fig. 2, in some embodiments of the present invention, the refrigeration system may be used for refrigeration, where a flow control valve of a cold bypass pipeline in the refrigeration system is a gas bypass capillary and a gas bypass electromagnetic valve that are connected to each other, a specific structure of the refrigeration system is not described herein again with reference to the description of the above embodiment, and a refrigeration process is as follows:

step 202, controlling the on-off of a main electromagnetic valve by using a pulse width modulation technology and a PID algorithm, and controlling the flow of a refrigerant entering an evaporator to realize a refrigeration function.

In a specific implementation process, when the refrigeration system normally works, the on-off of the main-path electromagnetic valve can be automatically controlled by using a pulse width modulation technology and a PID algorithm according to the temperature of the working chamber, the target temperature and the like, and the flow of the refrigerant entering the evaporator is controlled, so that the refrigeration function is realized. The PID algorithm may be implemented by using a PID controller (proportional-integral-derivative controller), and the embodiment of the present invention is not limited to a specific calculation manner.

And 204, when the refrigerating output quantity of the refrigerating system is smaller than the preset refrigerating output quantity, closing the main path electromagnetic valve, and inflating a gas bypass electromagnetic valve in the bypass pipeline.

In a specific implementation process, a gas bypass capillary tube and a gas bypass electromagnetic valve are adopted as a flow regulating valve in a gas bypass pipeline of a refrigeration system in the embodiment of the invention, when the refrigeration output quantity of the refrigeration system is smaller than the preset refrigeration quantity, the specific value of the preset refrigeration quantity can be set according to actual needs, the embodiment of the invention is not particularly limited, namely the refrigeration output quantity is extremely small, and at the moment, the temperature in a working chamber is considered to be relatively low, and high-strength refrigeration is not needed. The main path electromagnetic valve in the main path pipeline in the refrigeration system can be closed, so that no refrigeration liquid passes through the evaporator, at the moment, no refrigerant gas flows back from the low-pressure end of the compressor, and the pressure difference between the two ends of the compressor is larger and larger. At this time, the embodiment of the invention automatically opens the gas bypass electromagnetic valve in the gas bypass pipeline.

And step 206, shunting a part of the gaseous refrigerant at the exhaust end of the compressor by using a gas bypass capillary tube and directly returning the part of the gaseous refrigerant to the low-pressure end of the compressor to supplement the pressure of the compressor.

In a specific implementation process, when the refrigerating output of the refrigerating system is lower, the main path electromagnetic valve is closed, and after the gas side electromagnetic valve is opened, a part of the gaseous refrigerant at the exhaust end of the compressor can be shunted by the gas side capillary tube and directly returns to the low-pressure end of the compressor to supplement pressure to the compressor, so that negative pressure of the refrigerating system is prevented, and the stability of the refrigerating system is improved.

The automatic pressure compensation is realized on the compressor by utilizing the capillary tube and the gas side electromagnetic valve, the pressure compensation precision is high, and the stability of the system is ensured.

Based on the foregoing embodiments, in some embodiments of the present invention, the flow control valve in the cold bypass pipeline in the refrigeration system uses a cold bypass capillary tube and a cold bypass solenoid valve which are connected to each other, and the method may further include:

opening a cold bypass electromagnetic valve in a cold bypass pipeline when the exhaust temperature of the compressor is higher than the upper limit of a preset safety threshold;

In specific implementation process, can set up temperature sensor in the compressor, when the exhaust temperature of compressor was higher than preset safe threshold value upper limit, can open the cold by-pass solenoid valve in the cold by-pass pipeline, utilize cold by-pass capillary, convert the liquid refrigerant after the condenser condensation into low temperature low pressure refrigerant liquid through the throttle expansion, cool down the compressor, avoid the compressor because of the system fault that the high temperature leads to, or because of the high refrigeration effect that influences of high temperature. When the compressor presets the safety threshold value lower limit, can regard the temperature of compressor to be in normal range this moment, need not additionally cool down, can close cold side solenoid valve. According to the exhaust temperature of the compressor, the cold bypass electromagnetic valve in the cold bypass pipeline is automatically controlled to be opened and closed, the cold bypass capillary tube is used for automatically cooling the compressor, the cooling precision is high, and the human stability of the system is ensured.

The upper and lower limits of the preset safety threshold may be set according to actual use requirements, and embodiments of the present invention are not particularly limited.

On the basis of the foregoing embodiments, in some embodiments of the present invention, the method may further include:

In a specific implementation process, a pressure sensor can be arranged in the compressor to measure the suction pressure and the exhaust pressure of the compressor, when the suction pressure of the compressor is measured to be less than or equal to 0, even if a main path electromagnetic valve in a main path pipeline is opened, the gas bypass electromagnetic valve in the gas bypass pipeline can be automatically controlled to be opened, and the gas bypass capillary tube is used for supplementing pressure to the compressor, so that the dual protection of the compressor is realized.

Fig. 3 is a schematic flow chart of steady state control of a refrigeration system according to another embodiment of the present invention, and as shown in fig. 3, the steady state control process of the refrigeration system according to the embodiment of the present invention may include:

and step 302, controlling the on-off of a main electromagnetic valve by using a pulse width modulation technology and a PID algorithm, and controlling the flow of the refrigerant entering the evaporator to realize the refrigeration function.

When the refrigerating system works normally, the pulse width regulation technology and the PID algorithm can be utilized to realize the automatic control of the on-off of the main electromagnetic valve so as to control the flow of the refrigerant entering the evaporator, realize the refrigerating function and realize the automatic constant temperature control of the working chamber.

And step 304, when the refrigerating output of the system is extremely small, closing the main-path electromagnetic valve, opening the gas-side electromagnetic valve, and supplementing pressure to the low-pressure end of the compressor.

And step 306, when the flow required by the main liquid supply path is extremely small, the suction pressure is less than or equal to 0bar (gauge pressure) even if the liquid supply electromagnetic valve is opened. The pressure sensor can be used for acquiring the suction and exhaust pressure of the compressor, namely outputting a control signal when the suction pressure is less than or equal to 0bar (gauge pressure), and forcibly opening the gas-side electromagnetic valve for pressure supplement to play a role in double protection.

And 308, opening the cold side electromagnetic valve when the exhaust temperature of the compressor is higher than the upper limit of the preset safety threshold, and closing the cold side electromagnetic valve when the exhaust temperature of the compressor is lower than the lower limit of the preset safety threshold.

The main-path liquid supply electromagnetic valve, the cold bypass electromagnetic valve and the gas bypass electromagnetic valve can adopt pulse electromagnetic valves to replace original common electromagnetic valves, the pulse electromagnetic valves can act for more than 800 thousands of times, the service life is 8-16 years, the control requirements of the system can be completely met, and the system has good performance in actual operation tests.

The embodiment of the description provides an automatic control technology of a refrigerating system, which can realize stable and accurate pressure compensation of a bypass for a compressor, so that the exhaust temperature of the compressor is always kept in a safe range (such as +80 ℃ to +110 ℃), the suction pressure is not less than 0bar (gauge pressure), and the temperature fluctuation degree is not more than 0.2 ℃ when the low temperature in a test box is constant. Long-term test and verification of field equipment prove that the whole control system is stable in constant temperature/constant humidity, and the pressure and the temperature of the air suction and exhaust of the compressor are more stable than those of the traditional system, so that the system plays a great role in prolonging the service life of the equipment. In addition, the refrigeration system provided by the embodiment of the invention has the advantages of good constant temperature/humidity effect, long service life of equipment and high safety.

In an embodiment of the present invention, an environmental test chamber may further include a test chamber and a refrigeration system, where the refrigeration system is used to provide a constant temperature test environment for the test chamber, and the specific structure of the refrigeration system may refer to the descriptions of the above embodiments, and the specific structure of the test chamber may be selected according to actual needs, and the embodiment of the present invention is not limited specifically. The description of the above embodiments can be referred to for the humidification method, and details are not repeated here.

All the embodiments of the system and the method are described in a progressive mode, the same and similar parts among the embodiments are referred to each other, and each embodiment is mainly explained to be different from other embodiments. The relevant points can be obtained by referring to the partial description of the method embodiment.

In the 90 s of the 20 th century, improvements in a technology could clearly distinguish between improvements in hardware (e.g., improvements in circuit structures such as diodes, transistors, switches, etc.) and improvements in software (improvements in process flow). However, as technology advances, many of today's process flow improvements have been seen as direct improvements in hardware circuit architecture. Designers almost always obtain the corresponding hardware circuit structure by programming an improved method flow into the hardware circuit. Thus, it cannot be said that an improvement in the process flow cannot be realized by hardware physical modules. For example, a Programmable Logic Device (PLD), such as a Field Programmable Gate Array (FPGA), is an integrated circuit whose Logic functions are determined by programming the Device by a user. A digital system is "integrated" on a PLD by the designer's own programming without requiring the chip manufacturer to design and fabricate application-specific integrated circuit chips. Furthermore, nowadays, instead of manually making an integrated Circuit chip, such Programming is often implemented by "logic compiler" software, which is similar to a software compiler used in program development and writing, but the original code before compiling is also written by a specific Programming Language, which is called Hardware Description Language (HDL), and HDL is not only one but many, such as abel (advanced Boolean Expression Language), ahdl (alternate Language Description Language), traffic, pl (core unified Programming Language), HDCal, JHDL (Java Hardware Description Language), langue, Lola, HDL, laspam, hardsradware (Hardware Description Language), vhjhd (Hardware Description Language), and vhigh-Language, which are currently used in most popular applications. It will also be apparent to those skilled in the art that hardware circuitry that implements the logical method flows can be readily obtained by merely slightly programming the method flows into an integrated circuit using the hardware description languages described above.

From the above description of the embodiments, it is clear to those skilled in the art that the present application can be implemented by software plus necessary general hardware platform. With this understanding in mind, the present solution, or portions thereof that contribute to the prior art, may be embodied in the form of a software product, which in a typical configuration includes one or more processors (CPUs), input/output interfaces, network interfaces, and memory. The computer software product may include instructions for causing a computing device (which may be a personal computer, a server, or a network device, etc.) to perform the methods described in the various embodiments or portions of embodiments of the present application. The computer software product may be stored in a memory, which may include forms of volatile memory in a computer readable medium, Random Access Memory (RAM) and/or non-volatile memory, such as Read Only Memory (ROM) or flash memory (flash RAM). Memory is an example of a computer-readable medium. Computer-readable media, including both non-transitory and non-transitory, removable and non-removable media, may implement information storage by any method or technology. The information may be computer readable instructions, data structures, modules of a program, or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), Static Random Access Memory (SRAM), Dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), Read Only Memory (ROM), Electrically Erasable Programmable Read Only Memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-ROM), Digital Versatile Discs (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices, or any other non-transmission medium that can be used to store information that can be accessed by a computing device. As defined herein, computer readable media does not include transitory computer readable media (transient media), such as modulated data signals and carrier waves.

The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, systems and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable resource data updating apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable resource data updating apparatus, create a system for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable resource data update apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including an instruction system which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be loaded onto a computer or other programmable resource data update apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

In a typical configuration, a computing device includes one or more processors (CPUs), input/output interfaces, network interfaces, and memory. The memory may include forms of volatile memory in a computer readable medium, Random Access Memory (RAM) and/or non-volatile memory, such as Read Only Memory (ROM) or flash memory (flash RAM). Memory is an example of a computer-readable medium. Computer-readable media, including both non-transitory and non-transitory, removable and non-removable media, may implement information storage by any method or technology. The information may be computer readable instructions, data structures, modules of a program, or other data.

As will be appreciated by one skilled in the art, one or more embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, one or more embodiments of the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, one or more embodiments of the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.

One or more embodiments of the invention may be described in the general context of computer-executable instructions, such as program modules, being executed by a computer. Generally, program modules include routines, programs, objects, components, data structures, etc. that perform particular tasks or implement particular abstract data types. One or more embodiments of the invention may also be practiced in distributed computing environments where tasks are performed by remote processing devices that are linked through a communications network. In a distributed computing environment, program modules may be located in both local and remote computer storage media including memory storage devices.

The embodiments of the present invention are described in a progressive manner, and the same and similar parts in the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, for system embodiments, since they are substantially similar to method embodiments, the description is relatively simple, and the relevant points can be referred to only part of the description of the method embodiments. In the description of the present invention, reference to the description of the terms "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In the present disclosure, the schematic representations of the terms used above are not necessarily intended to be the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this disclosure can be combined and combined by one skilled in the art without contradiction.

The foregoing is merely an example of one or more embodiments of the present invention and is not intended to limit the scope of one or more embodiments of the present invention. Various modifications and alterations to one or more embodiments of the present invention will be apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the scope of the claims.

Claims

1. A refrigeration system, comprising: the cold bypass pipeline and the air bypass pipeline are connected in parallel in the main pipeline;

2. The refrigeration system according to claim 1, wherein an oil separator is further disposed in the main conduit, the oil separator being disposed between the compressor and the condenser, and the gas bypass solenoid valve being connected in parallel to an output port of the oil separator.

3. The refrigerant system as set forth in claim 1, wherein an accumulator is further provided in said main conduit, said accumulator being disposed between said condenser and said main solenoid valve for storing liquid refrigerant output from said condenser.

4. The refrigeration system according to claim 3, wherein a dry filter is further provided in the main path pipe, and the dry filter is used for filtering impurities and/or moisture in the refrigerant.

5. The refrigerant system as set forth in claim 1, wherein said cold bypass solenoid valve is adapted to open when said compressor discharge temperature is above a preset safety threshold upper limit and to close when said compressor discharge temperature is below a preset safety threshold lower limit;

6. The refrigerant system as set forth in claim 1, wherein said main circuit solenoid valve, said cold side solenoid valve and said gas side solenoid valve are pulse type solenoid valves.

7. The method for refrigerating by utilizing the refrigerating system is characterized in that a flow control valve of a cold bypass pipeline in the refrigerating system is a gas bypass capillary tube and a gas bypass electromagnetic valve which are connected with each other;

the method comprises the following steps:

8. The method of claim 7, wherein the flow control valve in the cold bypass line in the refrigerant system employs a cold bypass capillary tube and a cold bypass solenoid valve connected to each other, the method further comprising:

9. The method of claim 7, wherein the method further comprises:

10. An environmental test chamber, comprising; a test chamber and a refrigeration system as claimed in any one of claims 1 to 6 above for controlling the stability of the test chamber.