Air source heat pump chiller training operation experimental platform

Abstract

The present invention discloses an experimental platform for practical training of air source heat pump chillers, which can respectively simulate air source heat pump chillers to perform refrigeration cycles and heating cycles, enhance students' practical ability, and improve their ability to deal with problems. It includes a refrigeration system and a water circulation system. The refrigeration system includes a compressor, a gas-liquid separator, a four-way reversing valve, an outdoor fan, a first throttling unit, a second throttling unit, a first drying filter, a second drying filter and a heat exchanger. A high-pressure controller and a high-pressure pressure gauge are installed at the exhaust port of the compressor. The water circulation system is a closed cycle consisting of a water tank, a fourth one-way valve, a water pump and an indoor fan, and the heat exchanger is placed in the water tank. The platform provides three different throttling modes that can be switched for learning according to the purpose of the experiment, and uses high and low pressure controllers to control the inlet and outlet pressures of the compressor. At the same time, the performance test of the air source heat pump chiller can be realized.

Description

Technical Field

[0001] The present invention relates to the field of refrigeration technology, and more specifically, to an air source heat pump chiller practical operation experimental platform. Background Art

[0002] Higher engineering education is an important part of cultivating engineering and technological talents. How to cultivate students' engineering innovation ability will become the most important part of higher engineering education. Engineering innovation ability is the embodiment of students' comprehensive quality in engineering practice activities. Experimental teaching is an important part of cultivating engineering innovation ability and an indispensable part of engineering education. Experimental teaching is a process of training students to master experimental skills and then learn engineering knowledge by letting students learn, imitate and accumulate repeatedly under certain experimental conditions and experimental environment, with experimental projects as the carrier. Under such background, the requirements for experimental environment and experimental conditions are high, and the existing experimental equipment needs to be further improved and perfected. In terms of refrigeration learning, at present, there is a lack of necessary experimental equipment, and students can only learn theoretical knowledge and lack practical work experience, which affects the improvement of their ability to deal with problems in actual operation. Summary of the invention

[0003] The purpose of the present invention is to provide an air source heat pump chiller practical operation experimental platform to address the technical defects existing in the prior art, which can simulate the air source heat pump chiller to perform refrigeration cycle and heating cycle respectively, enhance students' practical ability and improve their problem-solving ability.

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

[0005] A training operation experimental platform for an air source heat pump chiller, comprising a refrigeration system and a water circulation system; the refrigeration system comprises a compressor, a gas-liquid separator, a four-way reversing valve, an outdoor fan, a first throttling unit, a second throttling unit, a first drying filter, a second drying filter and a heat exchanger, the exhaust port of the compressor is respectively connected to the inlet of a third needle valve and a second sight glass, the outlet of the second sight glass is connected to the first interface of the four-way reversing valve, the third interface of the four-way reversing valve is connected to the inlet of the gas-liquid separator in parallel with the outlet of the third needle valve, and the outlet of the gas-liquid separator is connected to the air intake port of the compressor through the first sight glass; the fourth interface of the four-way reversing valve is connected to one end of the outdoor fan through the fourth sight glass, the other end of the outdoor fan is connected to one end of the fifth sight glass, the other end of the fifth sight glass is respectively connected to the inlet of the first one-way valve and the outlet of the first throttling unit, the outlet of the first one-way valve is respectively connected to the inlet of a flow meter and the outlet of the second one-way valve; the outlet of the flow meter The ports are respectively connected to the inlets of the first filter drier and the second filter drier, and the outlet of the first filter drier is connected to the inlet of the first throttling unit; the outlet of the second filter drier is connected to the inlet of the second throttling unit, and the outlet of the second throttling unit is connected to the inlet of the sixth sight glass; the outlet of the sixth sight glass is connected to one end of the heat exchanger after being connected in parallel with the inlet of the second one-way valve, and the other end of the heat exchanger is connected to the second interface of the four-way reversing valve through the third sight glass; a high-pressure controller and a high-pressure pressure gauge are installed at the exhaust port of the compressor, and a low-pressure controller and a low-pressure pressure gauge are installed on the pipeline between the third needle valve and the gas-liquid separator; a second high-pressure pressure gauge and a second low-pressure pressure gauge are installed on the pipeline between the outdoor fan and the four-way reversing valve; a third high-pressure pressure gauge and a third low-pressure pressure gauge are installed on the pipeline between the heat exchanger and the four-way reversing valve; the water circulation system is a closed cycle consisting of a water tank, a fourth one-way valve, a water pump and an indoor fan, and the heat exchanger is placed in the water tank.

[0006] The air source heat pump chiller training operation experimental platform, the first throttling unit is composed of a first thermal expansion valve branch and a first needle valve branch in parallel.

[0007] The air source heat pump chiller training operation experimental platform, the second throttling unit is composed of a second thermal expansion valve branch, a capillary branch and a second needle valve branch in parallel.

[0008] The air source heat pump chiller training operation experimental platform, the first thermal expansion valve branch is composed of the first thermal expansion valve and the fourth manual valve, the first needle valve branch is composed of the first needle valve and the third manual valve, and the temperature sensing package of the first thermal expansion valve is placed on the return water pipe of the outdoor fan.

[0009] The air source heat pump chiller training operation experimental platform, the second thermal expansion valve branch is composed of the second thermal expansion valve and the seventh manual valve, the second needle valve branch is composed of the second needle valve and the eighth manual valve; the capillary branch is composed of a capillary and the ninth manual valve, and the temperature sensing package of the second thermal expansion valve is placed on the return water pipe of the heat exchanger.

[0010] Compared with the prior art, the present invention has the following beneficial effects:

[0011] 1. The air source heat pump chiller training operation experimental platform of the present invention can simulate the air source heat pump chiller to perform refrigeration cycle and heating cycle respectively, and use water as a coolant to exchange heat with the room, thereby realizing cooling or heating to the room, helping students to strengthen their understanding of theoretical knowledge and improve their ability to deal with problems.

[0012] 2. The practical training operation experimental platform 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] 3. The practical training operation experimental platform of the present invention is equipped with flow meter, pressure gauge and other measuring devices, which can measure the basic parameters and perform performance tests of the air source heat pump chiller.

[0014] 4. The practical training operation experimental platform of the present invention can switch between different throttling modes, which helps to understand and learn the working principles and actual performances of different throttling modes. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 Shown is a schematic diagram of the air source heat pump chiller practical operation experimental platform of the present invention. DETAILED DESCRIPTION

[0016] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0017] The principle diagram of the air source heat pump chiller training operation experimental platform of the present invention is as follows Figure 1As shown, the refrigeration system includes a refrigeration system and a water circulation system. The refrigeration system includes a compressor 1, a gas-liquid separator 4, a four-way reversing valve 7, an outdoor fan 46, a first throttling unit, a second throttling unit, a first drying filter 21, a second drying filter 23 and a heat exchanger 37. The exhaust port of the compressor 1 is connected to the inlet of the third needle valve 2 and the second sight glass 8 respectively, the outlet of the second sight glass 8 is connected to the first interface of the four-way reversing valve 7, the third interface of the four-way reversing valve 7 is connected to the inlet of the gas-liquid separator 4 in parallel with the outlet of the third needle valve 2, and the outlet of the gas-liquid separator 4 is connected to the suction port of the compressor 1 through the first sight glass 3; the fourth interface of the four-way reversing valve 7 is connected to one end of the outdoor fan 46 through the fourth sight glass 12, the other end of the outdoor fan 46 is connected to one end of the fifth sight glass 15, the other end of the fifth sight glass 15 is respectively connected to the inlet of the first one-way valve 18 and the outlet of the first throttling unit, the outlet of the first one-way valve 18 is respectively connected to the inlet of the flow meter 20 and the outlet of the second one-way valve 29; the outlet of the flow meter 20 is respectively connected to the inlet of the first drying filter 21 and the second drying filter 23, The outlet of the first drying filter 21 is connected to the inlet of the first throttling unit; the outlet of the second drying filter 23 is connected to the inlet of the second throttling unit, and the outlet of the second throttling unit is connected to the inlet of the sixth sight glass 30; the outlet of the sixth sight glass 30 is connected in parallel with the inlet of the second one-way valve 29 and then connected to one end of the heat exchanger 37, and the other end of the heat exchanger 37 is connected to the second interface of the four-way reversing valve 7 through the third sight glass 45; a high-pressure controller 6 and a high-pressure pressure gauge 5 are installed at the exhaust port of the compressor 1, and a low-pressure controller 43 and a low-pressure pressure gauge 42 are installed on the pipeline between the third needle valve 2 and the gas-liquid separator 4; a second high-pressure pressure gauge 13 and a second low-pressure pressure gauge 11 are installed on the pipeline between the outdoor fan 46 and the four-way reversing valve 7; a third high-pressure pressure gauge 33 and a third low-pressure pressure gauge 35 are installed on the pipeline between the heat exchanger 37 and the four-way reversing valve 7. The water circulation system is a closed loop consisting of a water tank 36 , a fourth one-way valve 38 , a water pump 40 , a third one-way valve 31 and an indoor fan 27 , and the heat exchanger 37 is placed in the water tank 36 .

[0018] In order to facilitate learning the working principles and actual performance of different throttling modes, the first throttling unit is composed of a first thermal expansion valve branch and a first needle valve branch in parallel. In this embodiment, the first thermal expansion valve branch is composed of a first thermal expansion valve 16 and a fourth manual valve 19, the first needle valve branch is composed of a first needle valve 14 and a third manual valve 17, and the temperature sensing package of the first thermal expansion valve 16 is placed on the return water pipeline of the outdoor fan 46.

[0019] The second throttling unit is composed of a second thermal expansion valve branch, a capillary tube branch and a second needle valve branch in parallel. The second thermal expansion valve branch is composed of a second thermal expansion valve 28 and a seventh manual valve 24, and the second needle valve branch is composed of a second needle valve 26 and an eighth manual valve 25; the capillary tube branch is composed of a capillary tube 32 and a ninth manual valve 41, and the temperature sensing package of the second thermal expansion valve 28 is placed on the return water pipeline of the heat exchanger 37.

[0020] In order to facilitate control and adjustment, a first manual valve 10 is installed at the inlet of the second high-pressure pressure gauge 13, a second manual valve 9 is installed at the inlet of the second low-pressure pressure gauge, a fifth manual valve 22 is installed between the flow meter 20 and the first drying filter 21, a sixth manual valve 44 is installed between the flow meter 20 and the second drying filter 23, an eleventh manual valve 34 is installed at the inlet of the third high-pressure pressure gauge 33, a twelfth manual valve 39 is installed at the inlet of the third low-pressure pressure gauge 35, and a tenth manual valve is installed on the water circulation pipeline.

[0021] Under refrigeration conditions: the first interface of the four-way reversing valve 7 is connected to the fourth interface, and the second interface is connected to the third interface. The refrigerant exchanges heat with the water in the water tank through the compressor 1, the four-way reversing valve 7, the outdoor fan 46, the second throttling unit (the second thermal expansion valve 28, the second needle valve 26 or the capillary tube 32), and the heat exchanger 37 in sequence. After absorbing heat and evaporating, it enters the gas-liquid separator 4 through the four-way reversing valve 7 for gas-liquid separation. The separated gas refrigerant enters the compressor 1 for a reciprocating cycle. The water in the water tank is sent to the indoor fan 27 through the water pump 40 to provide cooling for the room.

[0022] Under the heating condition: the first interface of the four-way reversing valve 7 is connected to the third interface, and the second interface is connected to the fourth interface. The refrigerant exchanges heat with the water in the water tank through the compressor 1, the four-way reversing valve 7, and the heat exchanger 37 in sequence. After releasing heat and liquefying, it passes through the first throttling unit (the first thermal expansion valve 16 or the first needle valve 14), the outdoor fan 46, and the four-way reversing valve 7, and enters the gas-liquid separator 4 for gas-liquid separation. The separated gas refrigerant enters the compressor 1 for a reciprocating cycle. The water in the water tank is sent to the indoor fan 27 through the water pump 40 to provide heat for the room.

[0023] The high and low pressure protection of the compressor 1 is realized by the high pressure controller 6 and the low pressure controller 43. When the inlet and outlet pressures of the compressor 1 are too low or too high, the high pressure controller 6 and the low pressure controller 43 control the compressor 1 to shut down.

[0024] The basic parameter measurement and performance test of the experimental platform of the present invention are completed by measuring devices such as the flow meter 20, the first high-pressure pressure gauge 5, the second high-pressure pressure gauge 13, the third high-pressure pressure gauge 33, the first low-pressure pressure gauge 42, the second low-pressure pressure gauge 11, and the third low-pressure pressure gauge 35.

[0025] The switching of the throttling mode is performed by controlling the opening and closing of the seventh manual valve 24 , the eighth manual valve 25 , and the ninth manual valve 41 to select the throttling mode in the cooling mode—the second thermal expansion valve 28 , the second needle valve 26 , or the capillary tube 32 .

[0026] The switching of the throttling mode is performed by controlling the opening and closing of the third manual valve 17 and the fourth manual valve 19 to select the throttling mode in the heating mode, namely, the first thermal expansion valve 16 or the first needle valve 14 .

[0027] The air source heat pump chiller training operation experimental platform of the present invention can simulate the air source heat pump chiller to perform refrigeration cycle and heating cycle respectively, and use water as a refrigerant to exchange heat with the room, thereby realizing cooling or heating to the room. The cooling mode and the heating mode can be switched by the four-way reversing valve 7, so as to realize a deeper study of the air source heat pump chiller.

[0028] 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 air source heat pump chiller training operation experimental platform, characterized in that: The invention comprises a refrigeration system and a water circulation system; the refrigeration system comprises a compressor, a gas-liquid separator, a four-way reversing valve, an outdoor fan, a first throttling unit, a second throttling unit, a first filter dryer, a second filter dryer and a heat exchanger, the exhaust port of the compressor is respectively connected to the inlet of the third needle valve and the second sight glass, the outlet of the second sight glass is connected to the first interface of the four-way reversing valve, the third interface of the four-way reversing valve is connected to the inlet of the gas-liquid separator after being connected in parallel with the outlet of the third needle valve, and the outlet of the gas-liquid separator is connected to the air intake port of the compressor through the first sight glass; the fourth interface of the four-way reversing valve is connected to one end of the outdoor fan through the fourth sight glass, the other end of the outdoor fan is connected to one end of the fifth sight glass, the other end of the fifth sight glass is respectively connected to the inlet of the first one-way valve and the outlet of the first throttling unit, the outlet of the first one-way valve is respectively connected to the inlet of the flow meter and the outlet of the second one-way valve; the outlet of the flow meter is respectively connected to the inlet of the first filter dryer and the second filter dryer, the outlet of the first filter dryer is connected to the inlet of the first one-way valve and the outlet of the second one-way valve; The inlet of the first throttling unit is connected; the outlet of the second filter drier is connected to the inlet of the second throttling unit, and the outlet of the second throttling unit is connected to the inlet of the sixth sight glass; the outlet of the sixth sight glass is connected to one end of the heat exchanger after being connected in parallel with the inlet of the second one-way valve, and the other end of the heat exchanger is connected to the second interface of the four-way reversing valve through the third sight glass; a high-pressure controller and a high-pressure pressure gauge are installed at the exhaust port of the compressor, and a low-pressure controller and a low-pressure pressure gauge are installed on the pipeline between the third needle valve and the gas-liquid separator; A second high-pressure pressure gauge and a second low-pressure pressure gauge are installed on the pipeline between the outdoor fan and the four-way reversing valve; a third high-pressure pressure gauge and a third low-pressure pressure gauge are installed on the pipeline between the heat exchanger and the four-way reversing valve; the water circulation system is a closed cycle consisting of a water tank, a fourth one-way valve, a water pump and an indoor fan, and the heat exchanger is placed in the water tank; the first throttling unit is composed of a first thermal expansion valve branch and a first needle valve branch in parallel; the second throttling unit is composed of a second thermal expansion valve branch, a capillary branch and a second needle valve branch in parallel.

2. The air source heat pump chiller training operation experimental platform according to claim 1 is characterized in that: The first thermal expansion valve branch is composed of a first thermal expansion valve and a fourth manual valve, the first needle valve branch is composed of a first needle valve and a third manual valve, and the temperature sensing package of the first thermal expansion valve is placed on the return water pipeline of the outdoor fan.

3. The air source heat pump chiller training operation experimental platform according to claim 1 is characterized in that: The second thermal expansion valve branch consists of the second thermal expansion valve and the seventh manual valve, and the second needle valve branch consists of the second needle valve and the eighth manual valve; the capillary branch consists of a capillary and the ninth manual valve, and the temperature sensing package of the second thermal expansion valve is placed on the return water pipeline of the heat exchanger.

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