An experimental system based on a small commercial refrigeration unit

Abstract

The invention discloses an experimental system based on a small commercial refrigeration device, including a compressor, a condenser, a high-pressure liquid storage device, a drying filter, a regenerator, a high-pressure throttling unit, a low-pressure throttling unit, a high-temperature evaporator and a low-temperature evaporator. The high-pressure throttling unit includes a high-pressure thermal expansion valve branch, a high-pressure capillary branch and a high-pressure needle throttling valve branch connected in parallel; the low-pressure throttling unit includes a low-pressure thermal expansion valve branch and a low-pressure capillary branch connected in parallel. The pipeline between the exhaust port of the compressor and the condenser, the pipeline of the air intake port of the compressor, the inlet pipeline of the high-pressure evaporator, the inlet pipeline of the low-pressure evaporator, and the outlet pipeline of the low-pressure evaporator are respectively provided with a sight glass. The system can realize multiple functions such as manual switching of throttling mode of the refrigeration system, troubleshooting and refrigerant observation, so as to enrich the teaching process and be in line with engineering practice. The actual operation under different working conditions can be simulated, which is conducive to improving the students' ability to analyze faults.

Description

Technical Field

[0001] The present invention relates to the technical field of experimental equipment, and more particularly to an experimental system based on a small commercial refrigeration device. Background Art

[0002] Refrigeration technology is a technology that combines theory with practice. Experimental teaching plays an irreplaceable and important role in cultivating students' hands-on practical skills and the ability to solve practical problems. At present, in the teaching process of refrigeration technology, due to the lack of experimental equipment, students can only conduct simple simulation experiments and cannot fully combine the refrigeration knowledge they have mastered with practical applications. In the actual work process, they often lack the technical means to overcome practical problems, which affects the normal progress of the work. Summary of the invention

[0003] The purpose of the present invention is to provide an experimental system for a small commercial refrigeration device that can realize multiple functions such as manual switching of throttling modes, troubleshooting and refrigerant observation, etc., in order to address the technical defects existing in the prior art.

[0004] The technical solution adopted to achieve the purpose of the present invention is:

[0005] An experimental system based on a small commercial refrigeration device, comprising a compressor, a condenser, a high-pressure liquid storage device, a drying filter, a heat regenerator, a high-pressure throttling unit, a low-pressure throttling unit, a high-temperature evaporator and a low-temperature evaporator; one of the exhaust ports of the compressor is connected to the inlet of the condenser, and the other is connected to the inlet of the low-temperature evaporator through a defrost electric control valve; the outlet of the condenser is divided into two routes, one is connected to the inlet of the high-pressure liquid storage device through a seventeenth manual valve, and the other is connected to the inlet of the sixteenth manual valve. The outlet of the sixteenth manual valve is connected in parallel with the outlet of the high-pressure liquid storage device and then connected to the inlet of the drying filter. The outlet of the drying filter is divided into two routes, one is connected to the first interface of the heat regenerator through a thirteenth manual valve, and the other is connected to one end of the twelfth manual valve. The other end of the twelfth manual valve is connected in parallel with the second interface of the heat regenerator and then connected to the high-pressure throttling unit and the low-pressure throttling unit respectively. The high-pressure throttling unit is connected to the inlet of the high-temperature evaporator, and the low-pressure throttling unit is connected to the inlet of the high-pressure evaporator. The inlet of the low-temperature evaporator is connected, and the outlet of the high-temperature evaporator is connected to the evaporation pressure regulating valve, and the two ends of the evaporation pressure regulating valve are connected in parallel with the seventh manual valve; the outlet of the low-temperature evaporator is connected to the inlet of the one-way valve; the evaporation pressure regulating valve is divided into two paths after being connected in parallel with the seventh manual valve, one path is connected to the third interface of the regenerator through the eleventh manual valve, and the other path is connected in parallel with the outlet of the one-way valve and connected to the inlet of the tenth manual valve, and the outlet of the tenth manual valve is respectively connected to the fourth interface of the regenerator and the air intake of the compressor; the high-pressure throttling unit includes a high-pressure thermal expansion valve branch, a high-pressure capillary branch and a high-pressure needle throttling valve branch connected in parallel; the low-pressure throttling unit includes a low-pressure thermal expansion valve branch and a low-pressure capillary branch; the pipeline between the exhaust port of the compressor and the condenser, the pipeline of the air intake port of the compressor, the inlet pipeline of the high-pressure evaporator, the inlet pipeline of the low-pressure evaporator, and the outlet pipeline of the low-pressure evaporator are respectively provided with sight glasses.

[0006] The air intake and exhaust ports of the compressor, and the inlets and outlets of the low-temperature evaporator and the high-temperature evaporator are respectively provided with pressure sensors; temperature sensors are respectively provided on the pipelines at the air intake and exhaust ends of the compressor, a temperature controller is provided at the outlet of the low-temperature evaporator, and a thermostat is provided at the outlet of the high-temperature evaporator.

[0007] The inlet end of the low-temperature throttling unit and the inlet end of the high-temperature throttling unit are respectively provided with a valve group consisting of a manual valve and an electric control valve connected in parallel.

[0008] An inlet end valve is installed on the regenerator.

[0009] Compared with the prior art, the present invention has the following beneficial effects:

[0010] 1. The small commercial refrigeration device experimental system of the present invention adds a teaching experiment link of refrigeration equipment on the basis of learning the theoretical knowledge of refrigeration devices. The system can realize multiple functions such as manual switching of throttling mode of refrigeration system, troubleshooting and refrigerant observation, making the teaching process richer and more in line with engineering practice.

[0011] 2. The experimental system of the present invention can simulate actual operation conditions under different working conditions, which is beneficial to improving students' ability to analyze faults.

[0012] 3. The practical training operation experimental system of the present invention is equipped with a high-pressure controller and a low-pressure controller, which can simulate the high and low pressure protection of the compressor.

[0013] 4. The experimental system of the present invention is equipped with measuring devices such as temperature sensors and pressure gauges, which can be used to measure basic parameters and perform performance tests on small commercial refrigeration devices. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 Shown is a schematic diagram of an experimental system of the present invention based on a small commercial refrigeration unit. DETAILED DESCRIPTION

[0015] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0016] The principle diagram of the experimental system of the present invention based on a small commercial refrigeration device is as follows Figure 1As shown, it includes a compressor 14, a condenser 15, a high-pressure liquid storage 16, a dry filter 17, a regenerator 13, a high-pressure throttling unit, a low-pressure throttling unit, a high-temperature evaporator 1 and a low-temperature evaporator 2. One of the exhaust ports of the compressor 14 is connected to the inlet of the condenser 15, and the other is connected to the inlet of the low-temperature evaporator 2 through the defrost electric control valve 12C; the outlet of the condenser 15 is divided into two routes, one is connected to the inlet of the high-pressure liquid storage 16 through the seventeenth manual valve 8r, and the other is connected to the inlet of the sixteenth manual valve 8q. The outlet of the sixteenth manual valve 8q is connected in parallel with the outlet of the high-pressure liquid storage 16 and then connected to the inlet of the dry filter 17. The outlet of the dry filter 17 is divided into two routes, one is connected to the inlet of the thirteenth manual valve 8r, and the other is connected to the inlet of the sixteenth manual valve 8q. The manual valve 8n is connected to the first interface of the regenerator 13, and the other path is connected to one end of the twelfth manual valve 8m. The other end of the twelfth manual valve 8m is connected in parallel with the second interface of the regenerator 13 and then connected to the high-pressure throttling unit and the low-pressure throttling unit respectively. The high-pressure throttling unit is connected to the inlet of the high-temperature evaporator 1, and the low-pressure throttling unit is connected to the inlet of the low-temperature evaporator 2. The outlet of the high-temperature evaporator 1 is connected to the evaporation pressure regulating valve 11, and the two ends of the evaporation pressure regulating valve 11 are connected in parallel with the seventh manual valve 8g. The outlet of the low-temperature evaporator 2 is connected to the inlet of the check valve 19; the evaporation pressure regulating valve 11 is divided into two paths after being connected in parallel with the seventh manual valve 8g, one path is connected to the third interface of the regenerator 13 through the eleventh manual valve 8l, and the other path is connected in parallel with the outlet of the check valve and connected to the inlet of the tenth manual valve 8k. The outlet of the tenth manual valve 8k is connected to the fourth interface of the regenerator 13 and the air intake of the compressor 14 respectively. The high-pressure throttling unit includes a high-pressure thermal expansion valve branch, a high-pressure capillary branch and a high-pressure needle throttling valve branch connected in parallel; the high-pressure thermal expansion valve branch is composed of a high-pressure thermal expansion valve 7a and a first manual valve 8a connected in series, the high-pressure capillary branch is composed of a high-pressure capillary 9a and a second manual valve 8b and a third manual valve 8c connected in series at both ends of the high-pressure capillary 9a; the high-pressure needle throttling valve branch is composed of a needle throttling valve 10 and an eighteenth manual valve 8s connected in series. The low-pressure throttling unit includes a low-pressure thermal expansion valve branch and a low-pressure capillary branch; the low-pressure thermal expansion valve branch is composed of a low-pressure thermal expansion valve 7b and a sixth manual valve 8f connected in series, the low-pressure capillary branch is composed of a low-pressure capillary 9b and a fourth manual valve 8d and a fifth manual valve 8e connected in series at both ends of the low-pressure capillary 9b.

[0017] Sight glasses 6 are respectively provided on the pipeline between the exhaust port of the compressor 14 and the condenser 15, on the pipeline of the air intake port of the compressor 14, on the inlet pipeline of the high-pressure evaporator 1, on the inlet pipeline of the low-pressure evaporator 2, and on the outlet pipeline of the low-pressure evaporator 2.

[0018] The exhaust port of the compressor 14 is provided with a temperature sensor 20a and a pressure sensor 3f, and the air intake port of the compressor is provided with a temperature sensor 20b and a pressure sensor 3e, to measure the air intake and exhaust temperature and pressure of the compressor 14. The inlet of the low-temperature evaporator 2 is provided with a pressure sensor 3c, and the outlet of the low-temperature evaporator 2 is provided with a pressure sensor 3d, and the inlet of the high-temperature evaporator 1 is provided with a pressure sensor 3a, and the outlet of the high-temperature evaporator 1 is provided with a pressure sensor 3b, to measure the inlet and outlet pressures of the low-temperature evaporator 2 and the high-temperature evaporator 1. The outlet of the low-temperature evaporator 2 is provided with a temperature controller 5, and the outlet of the high-temperature evaporator 1 is provided with a thermostat 4, to monitor the temperature changes in the refrigerator 1 and the refrigerator 2 at any time. The performance test of the small commercial refrigeration device experiment is further realized based on the measured basic parameters.

[0019] Wherein, the condenser 15 is an air-cooled condenser.

[0020] The inlet end of the low-pressure throttling unit is provided with a valve group consisting of a ninth manual valve 8i and a second electric-controlled valve 12b connected in parallel. The inlet end of the high-pressure throttling unit is provided with a valve group consisting of an eighth manual valve 8h and a first electric-controlled valve 12a connected in parallel. The regenerator 13 is provided with an inlet end valve 18.

[0021] A fourteenth manual valve 8o and a fifteenth manual valve 8p are connected in series to both ends of the filter dryer 17 .

[0022] The compressor 14 compresses the low-temperature and low-pressure refrigerant gas to a high-temperature and high-pressure state, and then enters the air-cooled condenser 15 to condense into a normal-temperature and high-pressure refrigerant liquid, and then passes through the drying filter 17 for drying and filtration, and then enters the regenerator 13 to perform heat exchange with the low-temperature refrigerant from the outlets of the low-temperature evaporator 2 and the high-temperature evaporator 1, so that the refrigerant gas at the outlets of the two evaporators is superheated, and the refrigerant at the outlet of the air-cooled condenser 15 is supercooled. The refrigerant coming out of the regenerator 13 is divided into two paths, namely a high-temperature circuit and a low-temperature circuit. In the high-temperature circuit, the refrigerant enters the high-pressure throttling unit through the first electric control valve 12a, and the throttling mode is switched by manually adjusting the first manual valve 8a, the third manual valve 8c, and the eighteenth manual valve 8s in the high-pressure throttling unit. After throttling and reducing the pressure by the high-pressure thermal expansion valve 7a or the high-pressure capillary 9a or the high-pressure needle throttle valve 10, the refrigerant enters the high-temperature evaporator 1 to absorb heat and evaporate, and then enters the evaporation pressure regulating valve 10 to adjust its pressure; the refrigerant in the low-temperature circuit enters the low-pressure throttling unit through the second electromagnetic valve 12b, and the throttling mode is switched by manually adjusting the sixth manual valve 8f and the fifth manual valve 8e in the low-pressure throttling unit. After throttling and reducing the pressure by the low-pressure thermal expansion valve 7b or the low-pressure capillary 9b, the refrigerant enters the low-temperature evaporator 2 to absorb heat and evaporate. The refrigerant at the outlet of the low-temperature evaporator 2 is mixed with the refrigerant from the high-temperature evaporator 1 after passing through the one-way valve 19, and enters the compressor 14 together. A part of the refrigerant coming out of the two evaporators enters the regenerator 13, and circulates in sequence.

[0023] The defrosting process of the experimental system of the present invention is as follows: the high-temperature and high-pressure refrigerant vapor at the outlet of the compressor 14 passes through the defrosting electric control valve 12c and enters the low-temperature evaporator 2 to perform the hot gas defrosting process.

[0024] The small commercial refrigeration device experimental system of the present invention not only studies the theoretical knowledge of refrigeration devices, but also adds a teaching experiment link of refrigeration equipment. The platform can realize multiple functions such as manual switching of throttling mode of refrigeration system, troubleshooting and refrigerant observation, making the teaching process richer and more in line with engineering practice.

[0025] The above is only a preferred embodiment of the present invention. It should be pointed out that, for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. An experimental system based on a small commercial refrigeration unit, characterized in that: The invention comprises a compressor, a condenser, a high-pressure liquid storage device, a drying filter, a heat regenerator, a high-pressure throttling unit, a low-pressure throttling unit, a high-temperature evaporator and a low-temperature evaporator; one of the exhaust ports of the compressor is connected to the inlet of the condenser, and the other is connected to the inlet of the low-temperature evaporator through a defrost electric control valve; the outlet of the condenser is divided into two routes, one is connected to the inlet of the high-pressure liquid storage device through a seventeenth manual valve, and the other is connected to the inlet of a sixteenth manual valve. The outlet of the sixteenth manual valve is connected in parallel with the outlet of the high-pressure liquid storage device and then connected to the inlet of the drying filter. The outlet of the drying filter is divided into two routes. , one way is connected to the first interface of the regenerator through the thirteenth manual valve, and the other way is connected to one end of the twelfth manual valve. The other end of the twelfth manual valve is connected in parallel with the second interface of the regenerator and is respectively connected to the high-pressure throttling unit and the low-pressure throttling unit. The high-pressure throttling unit is connected to the inlet of the high-temperature evaporator, and the low-pressure throttling unit is connected to the inlet of the low-temperature evaporator. The outlet of the high-temperature evaporator is connected to the evaporation pressure regulating valve, and the two ends of the evaporation pressure regulating valve are connected in parallel with the seventh manual valve; the outlet of the low-temperature evaporator is connected to the inlet of the one-way valve; the evaporation pressure regulating valve is connected to the The seventh manual valve is divided into two paths after being connected in parallel, one path is connected to the third interface of the regenerator through the eleventh manual valve, and the other path is connected in parallel with the outlet of the one-way valve and connected to the inlet of the tenth manual valve. The outlet of the tenth manual valve is respectively connected to the fourth interface of the regenerator and the air intake of the compressor; the high-pressure throttling unit includes a high-pressure thermal expansion valve branch, a high-pressure capillary branch and a high-pressure needle throttling valve branch connected in parallel; the low-pressure throttling unit includes a low-pressure thermal expansion valve branch and a low-pressure capillary branch; the pipeline between the exhaust port of the compressor and the condenser, the pipeline of the air intake of the compressor The pipeline, the inlet pipeline of the high-temperature evaporator, the inlet pipeline of the low-temperature evaporator, and the outlet pipeline of the low-temperature evaporator are respectively provided with sight glasses; the air intake and exhaust port of the compressor, and the inlets and outlets of the low-temperature evaporator and the high-temperature evaporator are respectively provided with pressure sensors; the pipelines at the air intake end and the exhaust end of the compressor are respectively provided with temperature sensors, the outlet of the low-temperature evaporator is provided with a temperature controller, and the outlet of the high-temperature evaporator is provided with a thermostat; the inlet end of the low-pressure throttling unit and the inlet end of the high-pressure throttling unit are respectively provided with valve groups composed of manual valves and electric control valves connected in parallel.

2. The experimental system based on a small commercial refrigeration device according to claim 1 is characterized in that: An inlet end valve is installed on the regenerator.

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