阅读说明：本技术 一种节能型高低温交变试验制冷系统 (Energy-saving high-low temperature alternation test refrigerating system ) 是由 胡斌 周贤 于 2020-04-03 设计创作，主要内容包括：本发明涉及制冷系统技术领域,特别是涉及一种节能型高低温交变试验制冷系统,制冷系统包括：制冷回路依次包括蒸发器箱体、压缩机、冷凝器和储液器,压缩机的输出端与冷凝器的输入端通过第二管道连接；余热回收回路包括第五管道,所述第五管道的两端分别连接所述蒸发器箱体的第二输入端和第二管道,所述蒸发器箱体的第二输出端与所述储液器的第二输入端通过第六管道连接；旁通管道的两端分别连接所述第二管道和所述第四管道。本发明解决现有技术中冷热对冲造成高能耗的问题,通过能量旁通和余热回收回路控制制冷系统冷源的制冷量,在降温和稳定控制某一温度点时,取消了电加热的对冲,大大节省试验箱的能耗；同时,提高了降温速率。(The invention relates to the technical field of refrigerating systems, in particular to an energy-saving high-low temperature alternating test refrigerating system, which comprises: the refrigerating circuit sequentially comprises an evaporator box body, a compressor, a condenser and a liquid storage device, wherein the output end of the compressor is connected with the input end of the condenser through a second pipeline; the waste heat recovery loop comprises a fifth pipeline, two ends of the fifth pipeline are respectively connected with the second input end of the evaporator box body and the second pipeline, and the second output end of the evaporator box body is connected with the second input end of the liquid storage device through a sixth pipeline; and two ends of the bypass pipeline are respectively connected with the second pipeline and the fourth pipeline. The invention solves the problem of high energy consumption caused by hot and cold offset in the prior art, controls the refrigerating capacity of a cold source of a refrigerating system through an energy bypass and a waste heat recovery loop, cancels the offset of electric heating when cooling and stably controlling a certain temperature point, and greatly saves the energy consumption of a test box; meanwhile, the cooling rate is improved.)

1. The utility model provides an energy-saving high low temperature alternation test refrigerating system which characterized in that, energy-saving high low temperature alternation refrigerating system includes: the refrigeration circuit comprises an evaporator box body (1), wherein a first output end of the evaporator box body (1) is in through connection with an input end of a compressor (2) through a first pipeline (5), an output end of the compressor (2) is connected with an input end of a condenser (3) through a second pipeline (6), an output end of the condenser (3) is connected with a first input end of a liquid storage device (4) through a third pipeline (7), and an output end of the liquid storage device (4) is connected with the first input end of the evaporator box body (1) through a fourth pipeline (8);

the waste heat recovery circuit comprises a fifth pipeline (12), two ends of the fifth pipeline (12) are respectively connected with the second input end of the evaporator box body (1) and the second pipeline (6), and the second output end of the evaporator box body (1) is connected with the second input end of the liquid storage device (4) through a sixth pipeline (13);

an energy bypass circuit, which comprises a bypass pipe (16), wherein two ends of the bypass pipe (16) are respectively connected with the second pipe (6) and the fourth pipe (8);

a controller (19), the controller (19) being electrically connected with the compressor (2).

2. The energy-saving high-low temperature alternating test refrigerating system according to claim 1, characterized in that: a first throttle valve (9) is installed in the refrigeration loop, a first electromagnetic valve (14) and a frequency domain control expansion valve (15) are installed in the waste heat recovery loop, and a second throttle valve (17) and a second electromagnetic valve (18) are installed in the energy bypass loop; the first electromagnetic valve (14), the frequency domain control expansion valve (15) and the second electromagnetic valve (18) are all electrically connected with the controller (19).

3. The energy-saving high-low temperature alternating test refrigerating system according to claim 2, characterized in that: the first electromagnetic valve (14) and the frequency domain control expansion valve (15) are both coupled and controlled through a controller (19); and the second throttle valve (17) and the second electromagnetic valve (18) are controlled in a time domain through a controller (19).

4. The energy-saving high-low temperature alternating test refrigerating system according to claim 1, characterized in that: the box evaporator is characterized in that a heater (10) is installed in the box body (1), and the heater (10) is electrically connected with the controller (19).

Technical Field

The invention relates to the technical field of refrigeration systems, in particular to an energy-saving high-low temperature alternating test refrigeration system.

Background

The experimental proof box of the high low temperature alternation of current simulated environment for the realization to the accurate control of temperature, need full power to open refrigerating system and refrigerate to evaporimeter box inner space at the temperature process that rises and falls, opens the electrical heating offset simultaneously, controls the heat of electrical heating output through PWM, realizes the accurate control to the incasement temperature. A prior art refrigeration system with high and low temperature crossover testing is shown in fig. 1.

In the prior art, the cold quantity output by the cold source is uncontrollable, the heat output by heating can be controlled, and the cold and the heat are in hedging, so that the high energy consumption of the test box is caused. The heating offset also causes the reduction of the cooling rate, and in the refrigeration system with the same refrigeration power, the heating offset increases the overall electric energy consumption of the unit.

Disclosure of Invention

In view of the above-mentioned shortcomings of the prior art, the present invention aims to provide an energy-saving high-low temperature alternating refrigeration system, which is used for solving the problem of high energy consumption caused by cold and hot opposite impacts in the prior art. The refrigerating capacity of a cold source of the refrigerating system is controlled by the refrigerating circuit and the waste heat recovery circuit, and the electric heating offset is cancelled when a certain temperature point is cooled and stably controlled, so that the energy consumption of the test box is greatly saved; the electric heating hedging is cancelled during the temperature reduction, and the temperature reduction rate is improved.

The heating output is completely closed in the temperature reduction process, and the refrigeration output is completely closed in the temperature rise process, so that the temperature rise and fall speed is improved, and the overall energy consumption level of the test box is saved.

To achieve the above and other related objects, the present invention provides an energy-saving high-low temperature alternating test refrigerating system, comprising:

the refrigeration circuit comprises an evaporator box body, a first output end of the evaporator box body is in through connection with an input end of a compressor through a first pipeline, an output end of the compressor is connected with an input end of a condenser through a second pipeline, an output end of the condenser is connected with a first input end of a liquid storage device through a third pipeline, and an output end of the liquid storage device is connected with the first input end of the evaporator box body through a fourth pipeline;

the waste heat recovery circuit comprises a fifth pipeline, two ends of the fifth pipeline are respectively connected with the second input end of the evaporator box body and the second pipeline, and the second output end of the evaporator box body is connected with the second input end of the liquid storage device through a sixth pipeline;

the energy bypass loop comprises a bypass pipeline, and two ends of the bypass pipeline are respectively connected with the second pipeline and the fourth pipeline;

and the controller is electrically connected with the evaporator box body through the compressor.

The refrigeration circuit is a carnot cycle refrigeration system. The flow distribution of the refrigerant in the refrigeration loop is adjusted through the waste heat recovery loop, and the two ends of the fifth pipeline are respectively connected with the second input end of the evaporator box body and the second pipeline, so that the refrigerant in the refrigeration loop can be divided from the fifth pipeline, and the flow distribution function is realized. And the waste heat recovery loop enables part of heat released to the environment by refrigerant phase change to enter the evaporator tank from the sixth pipeline and the fourth pipeline. When the device is actually used, the flow of the waste heat recovery loop is adjusted in real time according to the difference degree between the target temperature set in the controller during the test and the current environment temperature of the evaporator box body; when the target temperature is lower than the internal temperature of the current evaporator box body, the whole refrigeration power of the compressor is used for cooling, the waste heat recovery loop does not work at the moment, and the flow passing through the waste heat recovery loop is zero; when the target temperature is close to the current internal temperature of the evaporator box body, the waste heat recovery loop starts to work, the flow passing through the waste heat recovery loop is gradually increased, part of power of the compressor is used for continuously cooling in the refrigeration loop, and part of power is used for offsetting the cooling in the waste heat recovery loop.

The refrigerating capacity output by the compressor in the refrigerating loop is adjusted through the bypass pipeline. The bypass pipeline bypasses the high-temperature and high-pressure gas output by the compressor to a fourth pipeline connected with the evaporator box body, so that the refrigerating capacity output by the compressor is adjusted, and different refrigerating capacities output by the compressor under different working conditions are realized. When the evaporator is actually used, whether the bypass pipeline operates or not is controlled in real time according to the difference degree between the target temperature set in the controller during the test and the current environment temperature of the evaporator box body; when the target temperature is lower than the ambient internal temperature of the current evaporator box body, the full power of the compressor is used for refrigeration, the bypass pipeline is completely closed, and the required refrigeration capacity is gradually reduced along with the reduction of the temperature; when the target temperature is close to the current environment temperature in the evaporator box body, the bypass pipeline starts to work, and the actually required refrigerating capacity is reduced in the adjusting box until the required target temperature is reached.

The energy-saving high-low temperature alternating test refrigerating system controls the refrigerating capacity of a cold source of the refrigerating system through the refrigerating loop and the waste heat recovery loop, cancels the hedging of electric heating when a certain temperature point is cooled and stably controlled, and greatly saves the energy consumption of the test box; generally speaking, the larger the internal space of the test chamber is, the more obvious the energy-saving effect is. When the temperature reduction is finished, the offset of electric heating is cancelled through the waste heat recovery loop, the temperature reduction rate is improved, the time for reaching the target temperature is shortened, and therefore the energy consumption of the test is indirectly reduced. Through the refrigerating circuit and the waste heat recovery circuit, the refrigerating capacity of a cold source of the refrigerating system is controlled, the temperature rising and reducing speed is improved, and the overall energy consumption level of the test box is saved.

In an embodiment of the present invention, a first throttle valve is installed in the refrigeration loop, a first electromagnetic valve and a frequency domain control expansion valve are installed in the waste heat recovery loop, and a second throttle valve and a second electromagnetic valve are installed in the energy bypass loop; and the first electromagnetic valve, the frequency domain control expansion valve and the second electromagnetic valve are electrically connected with the controller. The throttling of the refrigerating circuit is controlled by a first throttling valve in the refrigerating circuit; the first electromagnetic valve is used for controlling the opening and closing of the waste heat recovery loop, and the frequency domain control expansion valve controls the flow of the waste heat recovery loop; the second electromagnetic valve controls the opening and closing of the energy bypass loop, and time domain control is adopted to realize the flow control of the energy bypass loop. In an embodiment of the present invention, the first solenoid valve and the frequency domain control expansion valve are both coupled and controlled by a controller; and the second throttle valve and the second electromagnetic valve are controlled in a time domain through a controller.

The first electromagnetic valve is opened, so that the waste heat recovery loop starts to work, and partial refrigerating capacity of the compressor is gradually offset. The controller adjusts the actually required refrigerating capacity of the evaporator box body by controlling the opening and closing time length of the first electromagnetic valve until the required target temperature is reached. The frequency domain control expansion valve accurately adjusts the actually required refrigerating capacity of the evaporator box body for cooling by adjusting the pressure of the waste heat recovery loop until the required target temperature is reached.

The second electromagnetic valve is opened to make the by-pass pipeline start to work and gradually offset part of the refrigerating capacity of the compressor. The controller adjusts the actually required refrigerating capacity of the evaporator box body by controlling the opening and closing time length of the second electromagnetic valve until the required target temperature is reached. The second throttling valve accurately adjusts the actually required refrigerating capacity of the evaporator box body for cooling through adjusting the pressure of the bypass pipeline until the required target temperature is reached.

In an embodiment of the present invention, a heater is installed in the evaporator box, and the heater is electrically connected to the controller. The heater is used for heating the evaporator box body.

In an embodiment of the present invention, a temperature sensor is installed in the evaporator tank, and a frequency domain control expansion valve is installed in the waste heat recovery loop; the controller is electrically connected with the temperature sensor and the frequency domain control expansion valve.

The temperature sensor is used for detecting the ambient temperature of the current evaporator box body, so that the opening degree of the expansion valve in the waste heat recovery loop is controlled by controlling the frequency domain, the flow of heat released by the phase change of the refrigerant to the environment in the waste heat recovery loop is adjusted, and the heat moved into the evaporator box body is adjusted.

As mentioned above, the energy-saving high-low temperature alternating test refrigeration system of the invention has the following beneficial effects: the energy-saving high-low temperature alternating refrigeration system controls the refrigerating capacity of a cold source of the refrigeration system through the refrigeration loop and the waste heat recovery loop, cancels the hedging of electric heating when a certain temperature point is cooled and stably controlled, and greatly saves the energy consumption of the test box; generally speaking, the larger the internal space of the test chamber is, the more obvious the energy-saving effect is. When the temperature reduction is finished, the offset of electric heating is cancelled through the waste heat recovery loop, the temperature reduction rate is improved, the time for reaching the target temperature is shortened, and therefore the energy consumption of the test is indirectly reduced. Through the waste heat recovery loop, the refrigerating capacity of a cold source of the refrigerating system is controlled, the cooling rate is improved, and the overall energy consumption level of the test box is saved. The energy bypass loop bypasses the high-temperature and high-pressure gas output by the compressor to a fourth pipeline connected with the evaporator box body, so that the refrigerating capacity output by the compressor is adjusted, and different refrigerating capacities output by the compressor under different working conditions are realized.

Drawings

Fig. 1 shows a schematic diagram of a high and low temperature alternating refrigeration system as disclosed in the prior art.

Fig. 2 is a schematic diagram of an energy-saving high-low temperature alternating refrigeration system according to an embodiment of the present invention.

Description of the element reference numerals

1-evaporator box body; 2-a compressor; 3-a condenser; 4-a liquid reservoir; 5-a first conduit; 6-a second conduit; 7-a third conduit; 8-a fourth conduit; 9-a first throttle valve; 10-a heater; 11-a temperature sensor; 12-a fifth pipeline; 13-a sixth conduit; 14-a first solenoid valve; 15-frequency domain control expansion valve; 16-a bypass conduit; 17-a second throttle valve; 18-a second solenoid valve; 19-a controller.

Detailed Description

The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will become apparent to those skilled in the art from the present disclosure.

Please refer to fig. 1-2. It should be understood that the structures, ratios, sizes, and the like shown in the drawings and described in the specification are only used for matching with the disclosure of the specification, so as to be understood and read by those skilled in the art, and are not used to limit the conditions under which the present invention can be implemented, so that the present invention has no technical significance, and any structural modification, ratio relationship change, or size adjustment should still fall within the scope of the present invention without affecting the efficacy and the achievable purpose of the present invention. In addition, the terms "upper", "lower", "left", "right", "middle" and "one" used in the present specification are for clarity of description, and are not intended to limit the scope of the present invention, and the relative relationship between the terms and the terms is not to be construed as a scope of the present invention.

Referring to fig. 2, the present invention provides an energy-saving refrigeration system for high and low temperature alternation tests, comprising:

the refrigeration circuit comprises an evaporator box body 1, a first output end of the evaporator box body 1 is in through connection with an input end of a compressor 2 through a first pipeline 5, an output end of the compressor 2 is connected with an input end of a condenser 3 through a second pipeline 6, an output end of the condenser 3 is connected with a first input end of a liquid accumulator 4 through a third pipeline 7, and an output end of the liquid accumulator 4 is connected with a first input end of the evaporator box body 1 through a fourth pipeline 8; the first throttle valve 9 is mounted on the fourth conduit 8; a heater 10 is installed in the evaporator box body 1, and a temperature sensor 11 is installed in the evaporator box body 1;

the waste heat recovery loop comprises a fifth pipeline 12, two ends of the fifth pipeline 12 are respectively connected with the second input end of the evaporator box body 1 and the second pipeline 6, and the second output end of the evaporator box body 1 is connected with the second input end of the liquid storage device 4 through a sixth pipeline 13; the first electromagnetic valve 14 and the frequency domain control expansion valve 15 are arranged on the sixth pipeline 13;

an energy bypass circuit, which comprises a bypass pipeline 16, wherein two ends of the bypass pipeline 16 are respectively connected with the second pipeline 6 and the fourth pipeline 8; a second throttle valve 17 and a second electromagnetic valve 18 are arranged in the bypass pipeline 16;

a first throttle valve is installed in the refrigeration loop, a first electromagnetic valve and a frequency domain control expansion valve are installed in the waste heat recovery loop, and a second throttle valve and a second electromagnetic valve are installed in the energy bypass loop;

a controller 19, wherein the controller 19 is electrically connected with the heater 10, the temperature sensor 11 and the compressor 2; the first electromagnetic valve 14 and the frequency domain control expansion valve 15 are both coupled and controlled by a controller 19; the second throttle valve 17 and the second electromagnetic valve 18 are controlled in a time domain by a controller 19.

The energy-saving high-low temperature alternating refrigerating system realizes the control of the refrigerating capacity of the refrigerating system through two modes of a waste heat recovery loop and an energy bypass loop:

A. a waste heat recovery loop: the expansion valve 15 is controlled by the frequency domain of the waste heat recovery circuit to regulate the flow distribution of the refrigerant in the refrigeration circuit. The refrigeration circuit is a Carnot cycle refrigeration mode, the waste heat recovery circuit enables part of heat released by refrigerant phase change to the environment to enter the evaporator box body 1 from the sixth pipeline 13 and the fourth pipeline 8, and the flow of the refrigerant in the waste heat recovery circuit is adjusted by adjusting the opening degree of the frequency domain control expansion valve 15 in the circuit, so that the heat moved into the evaporator box body 1 is adjusted. During actual use, the opening degree of the frequency domain control expansion valve 15 is adjusted in real time according to the difference degree between the target temperature set in the controller 19 during the test and the current environment temperature of the evaporator box body 1; when the difference between the target temperature and the current environment temperature of the evaporator box body 1 is large (when the target temperature is lower than the current environment temperature of the evaporator box body 1), the whole refrigeration power of the compressor 2 is used for cooling, at the moment, the waste heat recovery loop does not work, and the flow passing through the waste heat recovery loop is zero; when the difference between the target temperature and the current ambient temperature of the evaporator box 1 is small, the frequency domain control expansion valve 15 is gradually opened to enable the waste heat recovery circuit to start working, the flow passing through the waste heat recovery circuit is gradually increased, part of power of the compressor 2 is used for continuously cooling the refrigeration circuit, part of power is used for offsetting the cooling in the waste heat recovery circuit, the controller 19 adjusts the flow ratio of refrigerants passing through the refrigeration circuit and the waste heat circuit according to the current ambient temperature of the evaporator box 1, the refrigerating capacity of the compressor 2 and the heat generated by the waste heat recovery circuit are gradually adjusted, and when the target temperature is reached, the refrigerating capacity of the compressor 2 and the heat generated by the waste heat recovery circuit reach dynamic balance.

B. An energy bypass loop: the cooling capacity delivered by the compressor 2 in the refrigeration circuit is regulated by means of a bypass line 16. The bypass pipeline 16 bypasses the high-temperature high-pressure gas output by the compressor 2 to the fourth pipeline 8 connected with the evaporator box body 1, and can offset part of the refrigerating capacity output by the condenser 3, so that the refrigerating capacity of the energy-saving high-temperature and low-temperature alternating refrigerating system is adjusted, and different refrigerating capacities of the energy-saving high-temperature and low-temperature alternating refrigerating system under different working conditions are realized. In actual use, whether the bypass pipeline 16 operates or not is controlled in real time according to the difference degree between the target temperature set in the controller 19 in the test and the current environment temperature of the evaporator box body 1; when the target temperature and the current internal temperature of the evaporator tank 1 are greatly different (when the target temperature is lower than the current ambient temperature of the evaporator tank 1), the full power of the compressor 2 is used for refrigeration, the bypass pipeline 16 is completely closed, and the required refrigeration amount is gradually reduced along with the reduction of the temperature; when the difference between the target temperature and the current ambient temperature of the evaporator tank 1 is small, the second throttle valve 17 and the second electromagnetic valve 18 are opened to enable the bypass pipeline 16 to start working, and the actually required refrigerating capacity of the tank is adjusted until the required target temperature is reached.

In conclusion, the refrigerating capacity of the cold source of the refrigerating system is controlled by the refrigerating circuit, the waste heat recovery circuit and the energy bypass circuit, and the electric heating hedging is cancelled when a certain temperature point is cooled and stably controlled, so that the energy consumption of the test box is greatly saved; the electric heating hedging is cancelled during the temperature reduction, and the temperature reduction rate is improved. Therefore, the invention effectively overcomes various defects in the prior art and has high industrial utilization value.

The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.