Reinforced refrigeration system and method based on pulse tube principle

Abstract

The invention relates to the field of refrigerators, in particular to an enhanced refrigeration system and method based on a pulse tube principle. The reinforced refrigeration system based on the pulse tube principle comprises a pulse module, at least two refrigeration modules connected in parallel, a cooling module and a closed-loop water-based working medium heat exchange module with the boiling point below 80 DEG C which are connected in sequence. The closed-loop water-based working medium heat exchange module group comprises an evaporator and a condenser, the evaporator is a sealed container, a calandria formed by bending a single copper pipe is arranged in the evaporator, the inlet end of the calandria is connected with a one-way valve of the cooling module, and the outlet end of the calandria is connected with an air compressor of the pulsation module through another opening of the container; the evaporator and the condenser are connected through a pipeline, and the condenser and the evaporator are connected through a pipeline, so that the problems of low heat exchange efficiency, complex system structure, high energy consumption, high maintenance cost, high working medium corrosion risk and the like in the traditional refrigeration technology are solved, and through the collaborative design of pulse tube cooling capacity amplification and water-based closed-loop heat exchange.

Description

Technical Field

[0001] The present invention relates to the field of refrigerators, and particularly to an enhanced refrigeration system and method based on the pulse tube principle. Background Art

[0002] The pulse tube is the core component in a pulse tube refrigerator. The refrigeration principle of the pulse tube is based on the thermodynamic process of the gas working medium under periodic pressure fluctuations: the compressor generates an alternating pressure wave, driving the gas to reciprocate in the pulse tube, and realizing heat energy transfer through the

[0003] thermodynamic effect. Under the action of the pressure wave, the gas expands and absorbs heat at the cold end (absorbing heat in the low-temperature area), and then compresses and releases heat at the hot end (discharging heat to the outside). At the same time, through phase adjustment (such as a regenerator or an inertia tube), the timing, pressure variation, and low-temperature return air of the gas movement are controlled, so that the system temperature decreases, and thus a continuous low temperature is formed at the cold end. This process does not require mechanical moving parts and only relies on gas fluctuations to achieve efficient refrigeration.

[0004] However, when the pulse tube refrigerator is in the return air cycle, some of the gas has an increased temperature due to heat exchange, which makes the overall temperature decrease slowly, and further leads to problems such as low refrigeration efficiency and long refrigeration time. Summary of the Invention

[0005] The present invention provides an enhanced refrigeration system and method based on the pulse tube principle, and the technical problem to be solved is: solving the problems existing in traditional refrigeration technologies such as low heat exchange efficiency, complex system structure, high energy consumption, high maintenance cost, and high risk of working medium corrosion. Through the collaborative design of pulse tube cold quantity amplification and water-based closed-loop heat exchange, high-efficiency adaptive refrigeration is achieved while simplifying the structure and reducing energy consumption.

[0006] To achieve the above invention purpose, the enhanced refrigeration system based on the pulse tube principle of the present invention includes a pulsating module, at least two parallel refrigeration modules, a cooling module, and a closed-loop water-based working medium heat exchange module connected in sequence;

[0007] The closed-loop water-based working medium heat exchange module includes an evaporator and a condenser. The evaporator is a sealed container with a row of pipes formed by bending a single copper pipe inside. The inlet end of the row of pipes is connected to the one-way valve of the cooling module, and the outlet end of the row of pipes is connected to the air compressor of the pulsating module. A water-based solution is stored in the evaporator, and the row of pipes is surrounded by the water-based solution;

[0008] The closed-loop water-based working medium heat exchange module is separated from the overall heat source (servers, computers, etc.);

[0009] The evaporator and the condenser are connected by pipes for the water vapor in the evaporator to enter the condenser. The condenser and the evaporator are connected by pipes for the condensed water formed after the condenser condenses the water vapor to flow to the evaporator. A fan is provided on the condenser.

[0010] The air after heat exchange in the cooling module enters the closed-loop water-based working fluid heat exchange module through a one-way valve. Then, the water-based solution in the evaporator conducts heat exchange with it. The aqueous solution is heated and converted into a gas state, and rises into the condenser by the principle of thermosiphon.

[0011] Further, the condenser is arranged at a position higher than the evaporator, the height difference between the condenser and the evaporator is greater than one meter, the air inlet of the condenser is at the top, and the water outlet is at the bottom.

[0012] Further, the copper pipe of the condenser is in a continuous s-shaped form, and each section of the copper pipe is inclined downward. The solution water vapor condenses into water after being cooled by the fan in the condenser and flows back to the evaporator under the action of gravity.

[0013] Further, the water-based solution in the evaporator is an absorbent containing lithium bromide or an aqueous solution of deionized water.

[0014] Further, the closed-loop water-based working fluid heat exchange module is sealed and evacuated to 30 kPa, so that the water-based solution can evaporate at 70 °C and condense at 25 °C.

[0015] Further, the pulsation module includes an air compressor, an air storage tank, a dryer, and a radiator connected in sequence. The refrigeration module includes a cold storage pipe, a cold end pipe, a pulse pipe, an inertia pipe, and an air reservoir connected in sequence. There are two sets of the cold storage pipe, the cold end pipe, the pulse pipe, and the inertia pipe, which are connected in parallel to the air reservoir. The cooling module is connected to the cold end pipes of the two sets of refrigeration modules. The radiator is provided with a fan; the cooling module includes a copper cooling plate and a temperature controller. The copper cooling plate is connected to the temperature controller. The temperature controller is provided with a temperature sensor to measure the temperatures of the copper cooling plate and the cold end pipe and adjust the corresponding valves. The copper cooling plate is provided with microtubes inside; the cold end pipe is connected to the copper cooling plate. The copper cooling plate and the copper pipe of the evaporator are connected by a cold air duct. A one-way valve is provided in the pipeline between the copper cooling plate and the copper pipe of the evaporator.

[0016] Further, the dryer is filled with replaceable zeolite packages.

[0017] Further, the cold storage pipe is filled with zeolite molecular sieves.

[0018] Further, the cold end pipe is provided with small holes with a pore diameter of 0.5 - 1.2 mm near the end connected to the cold storage pipe, and an electric small hole valve for adjusting the small holes is provided to control the discharge amount of cold air.

[0019] Further, a pneumatic pressure regulating valve is provided at the outlet of the gas storage tank.

[0020] Further, the adjustment range of the pulsation module is 3.5 - 4 standard atmospheric pressures.

[0021] Further, a multi-way solenoid valve is provided between the radiator and the cold storage pipes of the two parallel refrigeration modules.

[0022] In this solution, a strengthened refrigeration method based on the pulse tube principle includes the following steps:

[0023] S1. The air compressor is started, compresses the ambient air, and transports it through the air pipe to be temporarily stored in the gas storage tank. The pneumatic pressure regulating valve at the outlet of the gas storage tank stabilizes the air pressure of the compressed air within the range of 3.5 - 4 atmospheres;

[0024] S2. After the compressed air in the gas storage tank is dehydrated and dried by the zeolite dryer, it enters the radiator equipped with a fan for pre-cooling to reduce the air temperature, and then is transported through the pipeline to the multi-way solenoid valve;

[0025] S3. The multi-way solenoid valve alternately distributes the air to the two parallel pipelines of the refrigeration module according to the pulsation time preset by the controller. When one pipeline is in the intake state, the other pipeline synchronously enters the return gas state, forming an alternating and cyclic air flow distribution;

[0026] S4. The air entering the intake pipeline flows through the cold storage pipe to store cold energy, and then generates a periodic pulsed air flow through the cold end pipe and the pulse tube. The pulsed air flow forms a phase delay in the inertia tube (with adjustable length), and cooperates with the gas reservoir to regulate the return gas phase, maintaining the stability of the refrigeration cycle;

[0027] S5. The cold air is led out from the small holes near the cold storage pipe end of the cold end pipe, and the cold air flow is controlled by an electric small hole valve (the opening degree is regulated by the controller). The cold air pipe transports the cold air to the microtubes inside the copper cooling plate;

[0028] S6. The cold air exchanges heat with the heat source (such as GPU, CPU) in the microtubes of the copper cooling plate, absorbs heat and then warms up. After passing through the one-way valve, the warmed air enters the pipes immersed in the water-based solution in the evaporator for heat exchange. The cooled air in the pipes returns to the air compressor to be recompressed; the water-based solution is heated to 70 °C and then vaporizes and rises by the principle of thermosiphon into the condenser. The water vapor of the solution condenses into water after being cooled by the fan in the condenser and flows back to the evaporator under the action of gravity, forming a closed-loop cycle.

[0029] The beneficial effects of the present invention are as follows: The enhanced refrigeration system based on the pulse tube principle of the present invention realizes an efficient and energy-saving refrigeration effect by integrating the cold amplification effect of the pulse tube and the closed-loop heat exchange technology of the water-based working medium. It utilizes the high latent heat of vaporization of water and the design of using lithium bromide absorbent or deionized water to reduce the boiling point of the working medium. Combining with the 30 kPa low-pressure closed-loop environment, water and solution can evaporate at 70°C and condense at 25°C. The self-circulation of the working medium by gravity is realized through the high-position inclined layout of the condenser and the thermosiphon principle, reducing energy consumption. There are no moving parts in the modular structure. The pulsating air flow of the air compressor drives the heat exchange between the cold end tube and the copper cooling plate. Combining with the alternating cycle control of the multi-way solenoid valve, while ensuring the system stability and low maintenance cost, the cooling working medium is isolated from external equipment through the sealing design to avoid the risk of corrosion, and the refrigeration intensity can be automatically adjusted according to the heat source load such as GPU and CPU, with the advantages of simple structure, cheap materials, energy efficiency adaptability and long service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0031] Figure 2 It is a working flow chart of the closed-loop water-based working medium heat exchange module of the present invention;

[0032] Corresponding table of reference numerals in the drawings:

[0033] 101, air compressor; 102, gas storage tank; 103, air pressure regulating valve; 104, radiator; 105, multi-way solenoid valve; 106, dryer; 201, cold storage tube; 202, pulse tube; 203, cold end tube; 204, inertia tube; 205, gas reservoir; 206, cold air duct; 207, orifice valve; 301, cooling plate; 302, microtube; 303, check valve; 304, temperature controller; 401, evaporator; 402, condenser. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0034] The following further describes the specific embodiments of the present invention with reference to the drawings. The same components are denoted by the same reference numerals.

[0035] It should be noted that the terms "front", "rear", "left", "right", "upper" and "lower" used in the following description refer to the directions in the drawings, and the terms "inner" and "outer" refer to the directions towards or away from the geometric center of a specific component respectively.

[0036] In order to make the content of the present invention more clearly understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention.

[0037] The enhanced refrigeration system of the present invention is based on the pulse tube 202 principle, and includes a pulsating module, at least two parallel refrigeration modules, a cooling module, and a closed-loop water-based working fluid heat exchange module connected in sequence;

[0038] The boiling point of the closed-loop water-based working fluid heat exchange module is below 80°C. The closed-loop water-based working fluid heat exchange module includes an evaporator 401 and a condenser 402. The copper tube of the evaporator 401 is connected to the cooling module through a pipeline, and a check valve 303 is provided in the pipeline between the copper tube of the evaporator 401 and the cooling module;

[0039] The evaporator 401 and the condenser 402 are connected by a pipeline for the water vapor in the evaporator 401 to enter the condenser 402. The condenser 402 and the evaporator 401 are connected by a pipeline. After the condenser 402 condenses the water vapor into condensed water, it flows to the evaporator 401. A water-based solution is provided in the evaporator 401, and a fan is provided on the condenser 402.

[0040] After the air is heat-exchanged in the cooling module, it enters the exhaust pipe of the closed-loop water-based working fluid heat exchange module through the check valve 303. The water-based solution in the evaporator 401 performs heat exchange on it, and the cooled air in the curved exhaust pipe returns to the air compressor for recompression; the water-based solution is heated and converted into a gas state, and rises into the condenser 402 by the principle of thermosiphon.

[0041] Among them, the condenser 402 is arranged at a position higher than the evaporator 401. The height difference between the condenser 402 and the evaporator 401 is greater than one meter. The air inlet of the condenser 402 is at the upper part and the water outlet is at the lower part. The copper tube of the condenser 402 is in a continuous s shape, and each section of the copper tube is inclined downward. The solution water vapor condenses into water after being cooled by the fan in the condenser 402 and flows back to the evaporator 401 under the action of gravity.

[0042] The water-based solution in the evaporator 401 is an absorbent containing lithium bromide or an aqueous solution using deionized water.

[0043] The closed-loop water-based working fluid heat exchange module is sealed and evacuated to 30 kPa, so that the aqueous solution can evaporate at 70°C and condense at 25°C.

[0044] The pulsation module includes an air compressor 101, a gas storage tank 102, a dryer 106, and a radiator 104 connected in sequence. The refrigeration module includes a cold storage pipe 201, a cold end pipe 203, a pulse pipe 202, an inertia pipe 204, and a gas reservoir 205 connected in sequence. The cold storage pipe 201, the cold end pipe 203, the pulse pipe 202, and the inertia pipe 204 are all provided with two groups and are connected in parallel to the gas reservoir 205. The cooling module is connected to the cold end pipes 203 of the two refrigeration modules. The cooling module includes a copper cooling plate 301 and a temperature controller 304. The copper cooling plate 301 is connected to the temperature controller 304. The temperature controller 304 is provided with a temperature sensor to measure the temperatures of the copper cooling plate 301 and the cold end pipe 203 and adjust the corresponding valves. The copper cooling plate 301 is provided with microtubes 302 inside.

[0045] The cold end pipe 203 is connected to the copper cooling plate 301. The copper cooling plate 301 is connected to the copper pipe of the evaporator 401 through a cold air pipe 206. A one-way valve 303 is provided in the pipeline between the copper cooling plate 301 and the copper pipe of the evaporator 401.

[0046] The dryer 106 is filled with a replaceable zeolite package.

[0047] The cold storage pipe 201 is filled with zeolite molecular sieve.

[0048] One end of the cold end pipe 203 close to the cold storage pipe 201 is provided with a small hole with a pore diameter of 0.5 - 1.2 mm, and an electric small hole valve 207 for adjusting the small hole is provided to control the discharge amount of cold air.

[0049] The outlet of the air storage tank air compressor; 102 is provided with a pressure regulating valve 103.

[0050] The regulation range of the pulsation module is 3.5 - 4 standard atmospheric pressures.

[0051] A multi-way solenoid valve 105 is provided between the radiator 104 and the cold storage pipes 201 of the two parallel refrigeration modules.

[0052] In this solution, a method for enhancing refrigeration based on the pulse tube principle includes the following steps:

[0053] S1. The air compressor is started, ambient air is compressed and transported through a gas pipe to be temporarily stored in the gas storage tank. The pressure regulating valve at the outlet of the gas storage tank stabilizes the air pressure of the compressed air within the range of 3.5 - 4 atmospheres.

[0054] S2. After the compressed air in the gas storage tank is dehydrated and dried by the zeolite dryer, it enters the radiator for pre-cooling to reduce the air temperature, and then is transported through a pipeline to the multi-way solenoid valve.

[0055] S3. The multi-way solenoid valve alternately distributes air to two parallel pipelines of the refrigeration module according to the pulsation time preset by the controller. When one pipeline is in the intake state, the other pipeline synchronously enters the return state, forming an alternating and cyclic air flow distribution.

[0056] S4. The air entering the intake pipeline flows through the cold storage pipe to store cold energy, and then generates a periodic pulsed air flow through the cold end pipe and the pulse pipe. The pulsed air flow forms a phase delay in the inertia pipe (with adjustable length) and cooperates with the air reservoir to regulate the return gas phase, maintaining the stability of the refrigeration cycle.

[0057] S5. The cold air is led out from the small holes at the end of the cold end pipe close to the cold storage pipe, and the electric small hole valve (the opening degree is controlled by the controller) controls the cold air flow rate. The cold air pipe transports the cold air to the micro pipes inside the copper cooling plate.

[0058] S6. The cold air exchanges heat with the heat source (such as GPU, CPU) in the micro pipes of the copper cooling plate, absorbs heat and then heats up. After passing through the one-way valve, the heated air enters the row pipes of the water-based solution in the evaporator for heat exchange. The cooled air in the row pipes returns to the air compressor for re-compression; the water-based solution is heated to 70 °C and then vaporizes and rises by the principle of thermosiphon into the condenser. The solution water vapor condenses into water after being cooled by the fan in the condenser and flows back to the evaporator under the action of gravity, forming a closed-loop cycle.

[0059] During specific use, after the air compressor 101 is started, it compresses the ambient air and transports it to the air storage tank 102 for temporary storage. The pressure regulating valve 103 at the outlet of the air storage tank 102 stabilizes the air pressure at 3.5 - 4 atmospheres. The compressed air is then dehydrated and dried by the zeolite dryer 106, pre-cooled by the radiator 104, and alternately distributed to two pipelines of the refrigeration module by the multi-way solenoid valve 105 according to the preset pulsation time; when one pipeline is in the intake state, the other pipeline enters the return state. After the air flows through the cold storage pipe 201 to store cold energy, it generates a pulsed air flow through the cold end pipe 203 and the pulse pipe 202. The inertia pipe 204 and the air reservoir 205 cooperate to regulate the return gas phase. The cold air led out from the cold end pipe 203 has its flow rate controlled by the electric small hole valve 207 and is transported through the cold air pipe 206 to the micro pipes 302 inside the copper cooling plate 301 for heat exchange with the heat source (such as GPU, CPU); the heated air passes through the one-way valve 303 and enters the row pipes of the water-based solution in the evaporator 401 for heat exchange. The cooled air in the row pipes returns to the air compressor for re-compression; the aqueous solution is heated to 70 °C and then vaporizes and rises by the principle of thermosiphon into the condenser 402. The solution water vapor condenses into water after being cooled by the fan in the condenser 402 and flows back to the evaporator 401 under the action of gravity, forming a closed-loop cycle.

[0060] The above are only the preferred embodiments of the present invention patent and are not intended to limit the present invention patent. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention patent shall be included within the protection scope of the present invention patent.

Claims

1. A reinforced refrigeration system based on the pulse tube principle, comprising a pulsating module, at least two parallel refrigeration modules, a cooling module, and a closed-loop water-based working fluid heat exchange module connected in sequence; The closed-loop water-based working fluid heat exchange module group includes an evaporator and a condenser. The evaporator is a sealed container with a row of pipes formed by bending a single copper pipe inside. The inlet end of the row of pipes is connected to the one-way valve of the cooling module, and the outlet end of the row of pipes is connected to the air compressor of the pulsating module. A water-based solution is stored in the evaporator, and the row of pipes is surrounded by the water-based solution; The evaporator and the condenser are connected by a pipe for the water vapor in the evaporator to enter the condenser. The condenser and the evaporator are connected by a pipe for the condenser to condense the water vapor into condensed water and then flow to the evaporator. A fan is provided on the condenser.

2. The enhanced refrigeration system based on the pulse tube principle according to claim 1, wherein, The condenser is arranged at a position higher than the evaporator, the height difference between the condenser and the evaporator is greater than one meter, the air inlet of the condenser is at the top, and the water outlet is at the bottom.

3. The enhanced refrigeration system based on the pulse tube principle according to claim 2, wherein, The copper pipe of the condenser is in a continuous s shape, and each section of the copper pipe is inclined downward.

4. The enhanced refrigeration system based on the pulse tube principle according to claim 1, characterized in that, The pulsating module includes an air compressor, a gas storage tank, a dryer, and a radiator connected in sequence. The refrigeration module includes a cold storage pipe, a cold end pipe, a pulse tube, an inertia tube, and an air reservoir connected in sequence. The cold storage pipe, the cold end pipe, the pulse tube, and the inertia tube are all provided with two groups and are connected in parallel to the air reservoir. The cooling module is connected to the cold end pipes of the two groups of refrigeration modules; the cooling module includes a copper cooling plate and a temperature controller. The copper cooling plate is connected to the temperature controller. The temperature controller is provided with a temperature sensor to measure the temperature of the copper cooling plate and the cold end pipe and adjust the corresponding valves. Microtubes are provided inside the copper cooling plate; the cold end pipe is connected to the copper cooling plate, the copper cooling plate and the copper pipe of the evaporator are connected by a cold air pipe, and a one-way valve is provided in the pipe between the copper cooling plate and the copper pipe of the evaporator.

5. The enhanced refrigeration system based on the pulse tube principle according to claim 4, characterized in that A small hole is provided at one end of the cold end pipe close to the cold storage pipe, and an electric small hole valve with adjustable small holes is provided to control the release amount of cold air.

6. The enhanced refrigeration system based on the pulse tube principle according to claim 4, characterized in that, A pressure regulating valve is provided at the outlet of the gas storage tank.

7. The enhanced refrigeration system based on the pulse tube principle according to claim 4, characterized in that, A multi-way solenoid valve is provided between the radiator and the cold storage pipes of the two parallel refrigeration modules.

8. The enhanced refrigeration system based on the pulse tube principle according to claim 4, characterized in that, The coolant in the evaporator is an absorbent containing lithium bromide or an aqueous solution of deionized water.

9. A method for enhancing refrigeration based on the pulse tube principle, characterized in that, Including the following steps: S1. The air compressor is started to compress the ambient air and transport it to the gas storage tank through a gas pipe for temporary storage. The pressure regulating valve at the outlet of the gas storage tank stabilizes the pressure of the compressed air in the range of 3.5 - 4 atmospheres; S2. The compressed air in the gas storage tank is dehydrated and dried by a zeolite dryer, then enters the radiator for pre-cooling to reduce the air temperature, and then is transported to the multi-way solenoid valve through a pipe; S3. The multi-way solenoid valve alternately distributes the air to the two parallel pipelines of the refrigeration module according to the pulsating time preset by the controller. When one pipeline is in the intake state, the other pipeline synchronously enters the return state to form an alternating cyclic air flow distribution; S4. The air flowing into the intake pipeline stores cold energy through the cold storage pipe, and then generates a periodic pulse air flow through the cold end pipe and the pulse tube. The pulse air flow forms a phase delay in the inertia tube and cooperates with the air reservoir to regulate the return gas phase to maintain the stability of the refrigeration cycle; S5. The small holes near the end of the cold end pipe close to the cold storage pipe lead out cold air, and the electric small hole valve controls the cold air flow. The cold air pipe transports the cold air to the microtubes inside the copper cooling plate. S6. The cold air exchanges heat with the heat source in the microtubes of the copper cooling plate, absorbs heat and then heats up. After passing through the one-way valve, the heated air enters the pipes immersed in the water-based solution in the evaporator for heat exchange. The cooled air in the pipes returns to the air compressor for re-compression. The water-based solution is heated and vaporized, and rises by the thermosiphon principle into the condenser. The solution water vapor condenses into water after being cooled by the fan in the condenser, and flows back to the evaporator under the action of gravity, forming a closed-loop cycle.

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