Low-temperature water chilling unit

Abstract

The invention relates to the field of water chilling units, in particular to a low-temperature water chilling unit which comprises a condenser, an evaporator, a compressor, an oil separator, an electric cabinet, an oil cooler, an economizer body, an exhaust pipeline, an air return pipeline, an oil separator oil return pipe, a first liquid pipeline and a second liquid pipeline. The left end of the condenser is provided with an evaporator which absorbs water heat by means of refrigerant liquid evaporation. A compressor is mounted on the front side above the evaporator; an oil separator for separating lubricating oil in steam discharged by the compressor is arranged at the right end of the compressor; an electric control box used for being in charge of electric control over the whole low-temperature water chilling unit is installed on the right side of the condenser and the right side of the oil separator. Chilled water as low as-35 DEG C can be stably and efficiently prepared and maintained, external cooling equipment is not needed for oil cooling, and it is ensured that the chilled water can meet actual requirements and exert the optimal performance.

Description

Technical Field

[0001] The invention relates to the field of water chillers, and in particular to a low-temperature water chiller. Background Art

[0002] A low-temperature chiller refers to a chiller with an outlet water temperature lower than or equal to 5°C. Some high-end models can even reach lower temperatures. Low-temperature chillers play an important role in industrial production, scientific research experiments, medical treatment and other fields, but they also have some disadvantages during use.

[0003] However, the existing low-temperature chillers require the use of high-performance materials and technologies, so their manufacturing costs are relatively high, which may pose a certain economic pressure for companies with limited budgets. Low-temperature chillers consume high energy during operation, especially when the cooling water temperature is too low.

[0004] Therefore, in order to solve the problems of relatively high manufacturing cost, high energy consumption and difficulty in achieving lower water temperature of the above-mentioned low-temperature chiller, a low-temperature chiller can be designed. Summary of the invention

[0005] In order to overcome the problems of relatively high manufacturing cost, high energy consumption and difficulty in achieving lower water temperatures of low temperature chillers.

[0006] The technical scheme of the present invention is: a low-temperature chiller, comprising a condenser, an evaporator, a compressor, an oil separator, an electric control box, an oil cooler, an economizer body, an exhaust pipeline, a return air pipeline, an oil separator return pipe, a first liquid pipeline, and a second liquid pipeline; an evaporator for absorbing water heat by evaporation of a refrigerant liquid is installed at the left end of the condenser; a compressor is installed on the front side above the evaporator; an oil separator for separating lubricating oil in steam discharged from the compressor is arranged at the right end of the compressor; an electric control box for electrical control of the entire low-temperature chiller is installed on the right side of the condenser and the oil separator; an oil cooler for quickly cooling the high-temperature lubricating oil discharged from the compressor is installed at the rear end of the compressor; an economizer body is installed at the lower end of the evaporator; an air outlet at the upper end of the oil separator is connected to the compressor through an "L"-shaped exhaust pipeline; the evaporator is connected to the front end of the compressor through a return air pipeline; an oil separator return pipe is installed between the compressor and the oil separator; a first liquid pipeline is arranged at the lower end of the evaporator; and the evaporator and the economizer body are connected through a second liquid pipeline.

[0007] Preferably, in this refrigeration unit, the compressor inhales low-temperature and low-pressure liquid refrigerant, and discharges high-temperature and high-pressure gaseous refrigerant after compression, which is separated in the oil separator, and the lubricating oil returns to the compressor. The high-temperature and high-pressure gaseous refrigerant enters the condenser, and the heat medium enters the condenser through the water inlet pipe on the heat source side, and then exchanges heat with the high-temperature and high-pressure gaseous refrigerant in the condenser and is discharged through the water outlet pipe on the heat source side and is divided into two paths, one entering the oil cooler and the other entering the economizer body, which is divided into two parts. One part is further cooled by throttling in the form of heat expansion to reduce the temperature of the other part and make it supercooled. The stabilized supercooled liquid directly enters the evaporator for refrigeration through the liquid supply valve, and the -25°C medium enters the evaporator, exchanges heat with the supercooled liquid and becomes -30°C and is discharged. The supercooled liquid after heat exchange returns to the economizer body, and the high-temperature lubricating oil of the compressor enters the oil cooler for heat exchange, becomes low-temperature lubricating oil and returns to the compressor for reuse.

[0008] Preferably, an air supply pipeline is installed between the economizer body and the compressor; and an economizer liquid pipeline is arranged at the left end of the economizer body.

[0009] Preferably, an oil cooling liquid pipe A and an oil cooling liquid pipe B are respectively installed on the rear side of the right end of the oil cooler; the oil cooling liquid pipe A is located below the oil cooling liquid pipe B; an oil cooling oil outlet pipe and an oil cooling oil return pipe are respectively installed on the front side of the right end of the oil cooler; the oil cooling oil outlet pipe is located above the oil cooling oil return pipe.

[0010] Preferably, a liquid injection pipeline is installed at the front end of the compressor.

[0011] Preferably, a front-to-back symmetrical water inlet for the use side is provided at the right end of the evaporator.

[0012] Preferably, a heat source side water outlet pipe and a heat source side water inlet pipe are respectively provided at the front end of the condenser; the heat source side water inlet pipe is located below the heat source side water outlet pipe.

[0013] Preferably, a gap is provided between the evaporator and the compressor and they are supported by a welded oil pressure difference bracket.

[0014] Preferably, the condenser adopts a shell and tube heat exchanger; the economizer body and the oil cooler adopt a plate heat exchanger; the evaporator adopts a dry shell and tube heat exchanger; and the compressor adopts a screw compressor.

[0015] Beneficial effects of the present invention:

[0016] The present invention sucks low-temperature and low-pressure liquid refrigerant through the compressor, and discharges high-temperature and high-pressure gaseous refrigerant after compression, which is separated in the oil separator, and the lubricating oil returns to the compressor. The high-temperature and high-pressure gaseous refrigerant enters the condenser, and the heat medium enters the condenser through the heat source side water inlet pipe, and then exchanges heat with the high-temperature and high-pressure gaseous refrigerant in the condenser and is discharged through the heat source side water outlet pipe and is divided into two paths, one path enters the oil cooler, and the other path enters the economizer body, which is divided into two parts. One part is further cooled by throttling in the form of heat expansion to remove The temperature of the other part is lowered to make it supercooled. The stabilized supercooled liquid enters the evaporator directly for refrigeration through the liquid supply valve. The -25℃ medium enters the evaporator, exchanges heat with the supercooled liquid and becomes -30℃ before being discharged. The supercooled liquid after heat exchange returns to the economizer body, and the high-temperature lubricating oil of the compressor enters the oil cooler for heat exchange, becomes low-temperature lubricating oil and returns to the compressor for reuse. It can stably and efficiently produce and maintain chilled water as low as -35℃. Oil cooling does not require external cooling equipment to ensure that it can meet actual needs and perform at its best. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 What is shown is a schematic diagram of the three-dimensional structure of the chiller of the present invention;

[0018] Figure 2 Another schematic diagram of the three-dimensional structure of the water chiller of the present invention is shown;

[0019] Figure 3 Shown is a schematic diagram of the top view of the structure of the water chiller of the present invention;

[0020] Figure 4 What is shown is a front view schematic diagram of the structure of the chiller of the present invention;

[0021] Figure 5 Shown is a schematic diagram of the side view structure of the chiller of the present invention;

[0022] Figure 6 What is shown is a schematic diagram of the principle framework of the chiller of the present invention.

[0023] Explanation of the reference numerals in the accompanying drawings: 1. Condenser; 2. Evaporator; 3. Compressor; 4. Oil separator; 5. Electric control box; 6. Oil cooler; 7. Economizer body; 8. Exhaust pipe; 9. Return air pipe; 10. Oil separator return pipe; 11. First liquid pipe; 12. Second liquid pipe; 13. Economizer liquid pipe; 14. Air supply pipe; 15. Oil-cooling liquid pipe A; 16. Oil-cooling liquid pipe B; 17. Oil-cooling oil outlet pipe; 18. Oil-cooling oil return pipe; 19. Liquid injection pipe; 20. Water inlet; 21. Water outlet pipe on the heat source side; 22. Water inlet pipe on the heat source side. DETAILED DESCRIPTION

[0024] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0025] See also Figure 1-6 The present invention provides an embodiment: a low-temperature chiller, comprising a condenser 1, an evaporator 2, a compressor 3, an oil separator 4, an electric control box 5, an oil cooler 6, an economizer body 7, an exhaust pipeline 8, a return air pipeline 9, an oil separator return pipe 10, a first liquid pipeline 11, and a second liquid pipeline 12; the evaporator 2 for absorbing water heat by evaporation of a refrigerant liquid is installed at the left end of the condenser 1; the compressor 3 is installed on the front side above the evaporator 2; the oil separator 4 for separating the lubricating oil in the steam discharged from the compressor 3 is arranged at the right end of the compressor 3; the electric control box 5 for the electrical control of the entire low-temperature chiller is installed on the right side of the condenser 1 and the oil separator 4; the rear end of the compressor 3 is installed with a cooling device for quickly cooling the high-temperature lubricating oil discharged from the compressor 3 The oil cooler 6 is provided at the lower end of the evaporator 2; the economizer body 7 is installed at the lower end of the evaporator 2; the air outlet at the upper end of the oil separator 4 is connected to the compressor 3 through an "L"-shaped exhaust pipe 8; the evaporator 2 is connected to the front end of the compressor 3 through a return air pipe 9; an oil separator return oil pipe 10 is installed between the compressor 3 and the oil separator 4; a first liquid pipe 11 is provided at the lower end of the evaporator 2; the evaporator 2 and the economizer body 7 are connected through a second liquid pipe 12; the condenser 1 adopts a shell and tube heat exchanger; the economizer body 7 and the oil cooler 6 adopt a plate heat exchanger; the evaporator 2 adopts a dry shell and tube heat exchanger; the compressor 3 adopts a screw compressor; an air supply pipe 14 is installed between the economizer body 7 and the compressor 3; the economizer liquid pipe 13 is provided at the left end of the economizer body 7.

[0026] See also Figure 4 In this embodiment, a liquid injection pipeline 19 is installed at the front end of the compressor 3; a water inlet 20 for the use side water inlet is opened at the right end of the evaporator 2, and a heat source side water outlet pipe 21 and a heat source side water inlet pipe 22 are respectively arranged at the front end of the condenser 1; the heat source side water inlet pipe 22 is located below the heat source side water outlet pipe 21.

[0027] See also Figure 5 In this embodiment, a gap is provided between the evaporator 2 and the compressor 3 and they are supported by a welded oil pressure difference bracket; an oil cooling liquid pipe A15 and an oil cooling liquid pipe B16 are respectively installed on the rear side of the right end of the oil cooler 6; the oil cooling liquid pipe A15 is located below the oil cooling liquid pipe B16; an oil cooling oil outlet pipe 17 and an oil cooling oil return pipe 18 are respectively installed on the front side of the right end of the oil cooler 6; the oil cooling oil outlet pipe 17 is located above the oil cooling oil return pipe 18.

[0028] When working, low-temperature and low-pressure liquid refrigerant is sucked in through the compressor 3, and high-temperature and high-pressure gaseous refrigerant is discharged after compression, separated in the oil separator 4, and the lubricating oil returns to the compressor 3. The high-temperature and high-pressure gaseous refrigerant enters the condenser 1, and the heat medium enters the condenser 1 through the heat source side water inlet pipe 22, and then exchanges heat with the high-temperature and high-pressure gaseous refrigerant in the condenser 1 and is discharged through the heat source side water outlet pipe 21 and is divided into two paths, one of which enters the oil cooler 6 and the other enters the economizer body 7. It is divided into two parts, one of which is further throttled in the form of thermal expansion. The temperature of the other part is lowered by a step of cooling to make it supercooled. The stabilized supercooled liquid directly enters the evaporator 2 for refrigeration through the liquid supply valve. The medium at -25℃ enters the evaporator 2, and is discharged as -30℃ after heat exchange with the supercooled liquid. The supercooled liquid after heat exchange returns to the economizer body 7. The high-temperature lubricating oil of the compressor 3 enters the oil cooler 6 for heat exchange, and is returned to the compressor 3 for reuse after being converted into low-temperature lubricating oil. Chilled water as low as -35℃ can be produced and maintained stably and efficiently. No external cooling equipment is required for oil cooling to ensure that it can meet actual needs and perform at its best performance.

Claims

1. A low-temperature water chiller, comprising a condenser (1); characterized in that: The condenser (1) also includes an evaporator (2), a compressor (3), an oil separator (4), an electric control box (5), an oil cooler (6), an economizer body (7), an exhaust pipe (8), an air return pipe (9), an oil return pipe (10), a first liquid pipe (11), and a second liquid pipe (12); the evaporator (2) for absorbing water heat by evaporating a refrigerant liquid is installed at the left end of the condenser (1); the compressor (3) is installed on the front side above the evaporator (2); the oil separator (4) for separating lubricating oil from steam discharged from the compressor (3) is arranged at the right end of the compressor (3); and a cooling element for the entire low-temperature chiller is installed on the right side of the condenser (1) and the oil separator (4). An electric control box (5) for electrical control of the group; an oil cooler (6) for quickly cooling high-temperature lubricating oil discharged from the compressor (3) is installed at the rear end of the compressor (3); an economizer body (7) is installed at the lower end of the evaporator (2); an air outlet at the upper end of the oil separator (4) and the compressor (3) are connected via an "L"-shaped exhaust pipeline (8); the evaporator (2) and the front end of the compressor (3) are connected via an air return pipeline (9); an oil separator return pipe (10) is installed between the compressor (3) and the oil separator (4); a first liquid pipeline (11) is provided at the lower end of the evaporator (2); and the evaporator (2) and the economizer body (7) are connected via a second liquid pipeline (12).

2. The low temperature chiller according to claim 1, characterized in that: An air supply pipeline (14) is installed between the economizer body (7) and the compressor (3); and an economizer liquid pipeline (13) is arranged at the left end of the economizer body (7).

3. The low temperature water chiller according to claim 1, characterized in that: An oil cooling liquid pipe A (15) and an oil cooling liquid pipe B (16) are respectively installed on the rear side of the right end of the oil cooler (6); the oil cooling liquid pipe A (15) is located below the oil cooling liquid pipe B (16); an oil cooling oil outlet pipe (17) and an oil cooling oil return pipe (18) are respectively installed on the front side of the right end of the oil cooler (6); the oil cooling oil outlet pipe (17) is located above the oil cooling oil return pipe (18).

4. The low temperature water chiller according to claim 1, characterized in that: A liquid injection pipeline (19) is installed at the front end of the compressor (3).

5. The low temperature water chiller according to claim 1, characterized in that: The right end of the evaporator (2) is provided with a front-to-back symmetrical water inlet (20) for inletting water from the user side.

6. The low temperature water chiller according to claim 1, characterized in that: A heat source side water outlet pipe (21) and a heat source side water inlet pipe (22) are respectively arranged at the front end of the condenser (1); the heat source side water inlet pipe (22) is located below the heat source side water outlet pipe (21).

7. The low temperature water chiller according to claim 1, characterized in that: A gap is provided between the evaporator (2) and the compressor (3), and they are supported by welding an oil pressure difference bracket.

8. The low temperature water chiller according to claim 1, characterized in that: The condenser (1) adopts a shell and tube heat exchanger; the economizer body (7) and the oil cooler (6) adopt plate heat exchangers; the evaporator (2) adopts a dry shell and tube heat exchanger; and the compressor (3) adopts a screw compressor.

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