Refrigerating system for reducing refrigeration oil temperature by adopting secondary heat exchange device

Abstract

The utility model relates to the technical field of refrigerating systems, and discloses a refrigerating system for reducing refrigeration oil temperature by adopting a secondary heat exchange device, which comprises an evaporator, a condenser arranged below the evaporator, a compressor arranged above the evaporator, an exhaust shut-off valve mounted at the upper end of the compressor, and a secondary heat exchange device mounted at the lower end of the compressor. The exhaust shut-off valve is connected with the condenser through an exhaust pipe, a plate exchange type oil cooler is installed in the middle of the upper end of the condenser, and an oil cooling liquid supply pipe is installed at the position, close to the bottom, of one side of the plate exchange type oil cooler. The operating condition and the operating efficiency of the refrigerating unit can be obviously improved, the designed structure and manufacturing are simple, the number of parts is small, the size is small, connection is convenient, performance is stable, reliability is high, cost is low, high practicability is achieved, wide-range wide popularization can be achieved, and the market prospect is wide. The stable operation of the low-temperature refrigerating unit can be improved, the energy efficiency is improved, and energy conservation and emission reduction are achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of refrigeration systems, and particularly relates to a refrigeration system that uses a secondary heat exchange device to reduce the temperature of the refrigeration oil. Background Technique

[0002] The refrigeration principle of a general refrigerating machine: The function of the compressor is to compress the steam with lower pressure and temperature into steam with higher pressure and temperature, reducing the volume of the steam and increasing its pressure and temperature. The compressor sucks in the working medium steam with lower pressure and temperature coming out of the evaporator, raises its pressure and temperature, and then sends it into the condenser. In the condenser, it condenses into a liquid with higher pressure. After throttling through the throttle valve, it becomes a liquid with lower pressure and temperature and is sent into the evaporator. In the evaporator, it absorbs heat and evaporates into steam with lower pressure, and then is sent into the inlet of the compressor, thus completing the refrigeration cycle.

[0003] In the existing refrigeration system, during use, the operating conditions and operating efficiency of the refrigeration unit are low, and the designed structure is complex to manufacture, with many components, large volume, inconvenient connection, unstable performance, low reliability, high cost, and weak practicability, resulting in the inability to achieve wide promotion on a large scale. Secondly, it is impossible to improve the stable operation, energy efficiency improvement, energy conservation and emission reduction of low-temperature refrigeration units. Therefore, there is an urgent need for a refrigeration system that uses a secondary heat exchange device to reduce the temperature of the refrigeration oil to solve the above technical problems. Content of the Utility Model

[0004] The purpose of the utility model is to provide a refrigeration system that uses a secondary heat exchange device to reduce the temperature of the refrigeration oil, so as to solve the problems raised in the above background technique.

[0005] To achieve the above purpose, the utility model provides the following technical solutions:

[0006] A refrigeration system using a secondary heat exchange device to reduce the temperature of the refrigeration oil, including an evaporator, a condenser is arranged below the evaporator, a compressor is arranged above the evaporator, an exhaust shut-off valve is installed at the upper end of the compressor, the exhaust shut-off valve is connected to the condenser through an exhaust pipe, a plate heat exchanger type oil cooler is installed at the middle of the upper end of the condenser, an oil cooling liquid supply pipe is installed at the bottom on one side of the plate heat exchanger type oil cooler, one end of the oil cooling liquid supply pipe is connected to a subcooled main liquid pipe, an oil cooling solenoid valve is installed on the oil cooling liquid supply pipe, an oil cooling expansion valve is installed on the oil cooling liquid supply pipe and on the right side of the oil cooling solenoid valve, an oil cooling return pipe is installed at the top on one side of the plate heat exchanger type oil cooler, an oil inlet pipe is installed on one side of the plate heat exchanger type oil cooler and on one side of the oil cooling return pipe, one end of the oil inlet pipe is connected to the oil outlet of the compressor, an oil outlet pipe is arranged at the bottom on one side of the plate heat exchanger type oil cooler and on one side of the oil cooling liquid supply pipe, one end of the oil outlet pipe is connected to the oil inlet of the compressor, a return pipe is arranged at one side of the end of the evaporator, a subcooled main liquid pipe is connected below the end of the evaporator and at the lower side of the return pipe, one end of the oil cooling return pipe is connected to the return pipe, the other end of the return pipe is connected to the compressor, and an electric control box is arranged obliquely behind the compressor.

[0007] As a preferred technical solution of the present invention, a return air shut-off valve is installed on the return pipe.

[0008] As a preferred technical solution of the present invention, a main liquid path expansion valve is installed on the subcooled main liquid pipe, and the number of the main liquid path expansion valves is set to two.

[0009] As a preferred technical solution of the present invention, the oil cooling return pipe and the oil inlet pipe are arranged symmetrically about the plate heat exchanger type oil cooler in the front and back.

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

[0011] The present invention can significantly improve the operating conditions and operating efficiency of the refrigeration unit. The structure of this design is simple, with few components, small volume, convenient connection, stable performance, high reliability, and low cost. It has strong practicability, can be widely promoted on a large scale, and can improve the stable operation, energy efficiency improvement, and energy conservation and emission reduction of low-temperature refrigeration units. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] By reading the detailed description of the non-restrictive embodiments with reference to the following drawings, other features, purposes, and advantages of the present application will become more obvious:

[0013] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0014] Figure 2 The enlarged structural schematic diagram of part A in the present utility model Figure 1 ;

[0015] Figure 3 The enlarged structural schematic diagram of part B in the present utility model Figure 1 ;

[0016] In the figure: 1, evaporator; 2, exhaust pipe; 3, plate heat exchanger oil cooler; 4, oil cooling return air pipe; 5, oil cooling expansion valve; 6, oil outlet pipe; 7, oil cooling liquid supply pipe; 8, condenser; 9, main liquid circuit expansion valve; 10, subcooled main liquid pipe; 11, return air shut-off valve; 12, return air pipe; 13, oil inlet pipe; 14, exhaust shut-off valve; 15, electric control box; 16, compressor; 17, oil cooling solenoid valve. Specific embodiments

[0017] The present application will be further described in detail below with reference to the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the related utility model and do not limit the utility model. In addition, it should be noted that for the convenience of description, only the parts related to the utility model are shown in the drawings. In the drawings of the embodiments of the present utility model, different types of hatching lines are not marked according to the national standard, nor are the materials of the components required. It is to distinguish the sectional views of the components in the drawings.

[0018] Please refer to Figures 1-3 , a refrigeration system using a secondary heat exchange device to reduce the temperature of refrigeration oil, including an evaporator 1, a condenser 8 is arranged below the evaporator 1, a compressor 16 is arranged above the evaporator 1, an exhaust shut-off valve 14 is installed at the upper end of the compressor 16, the exhaust shut-off valve 14 is connected to the condenser 8 through an exhaust pipe 2, a plate heat exchanger oil cooler 3 is installed at the middle of the upper end of the condenser 8, an oil cooling liquid supply pipe 7 is installed at the bottom of one side of the plate heat exchanger oil cooler 3, one end of the oil cooling liquid supply pipe 7 is connected to the subcooled main liquid pipe 10, an oil cooling solenoid valve 17 is installed on the oil cooling liquid supply pipe 7, an oil cooling expansion valve 5 is installed on the oil cooling liquid supply pipe 7 and on the right side of the oil cooling solenoid valve 17, an oil cooling return air pipe 4 is installed at the top of one side of the plate heat exchanger oil cooler 3, an oil inlet pipe 13 is installed on one side of the plate heat exchanger oil cooler 3 and on one side of the oil cooling return air pipe 4, one end of the oil inlet pipe 13 is connected to the oil outlet of the compressor 16, an oil outlet pipe 6 is arranged at the bottom of one side of the plate heat exchanger oil cooler 3 and on one side of the oil cooling liquid supply pipe 7, one end of the oil outlet pipe 6 is connected to the oil inlet of the compressor 16, a return air pipe 12 is arranged at one end of the evaporator 1, the subcooled main liquid pipe 10 is connected below the return air pipe 12 at one end of the evaporator 1, one end of the oil cooling return air pipe 4 is connected to the return air pipe 12, the other end of the return air pipe 12 is connected to the compressor 16, and an electric control box 15 is arranged obliquely behind the compressor 16.

[0019] Among them, a return air shut-off valve 11 is installed on the return air pipe 12.

[0020] Among them, a main liquid line expansion valve 9 is installed on the subcooled main liquid pipe 10, and the number of the main liquid line expansion valves 9 is set to two.

[0021] Among them, the oil-cooled return air pipe 4 and the oil inlet pipe 13 are arranged in front-back axisymmetry with respect to the plate heat exchanger type oil cooler 3.

[0022] The working principle and usage process of the present utility model: First, the structure of this secondary heat exchange and refrigerating oil temperature reduction device mainly consists of a plate heat exchanger type oil cooler 3, an oil-cooled expansion valve 5, an oil-cooled solenoid valve 17, an oil-cooled liquid supply pipe 7, an oil-cooled return air pipe 4, etc. The opening condition of the plate heat exchanger type oil cooler 3 is jointly controlled according to the refrigerating oil temperature and the exhaust gas temperature of the refrigeration unit. When either the refrigerating oil temperature or the exhaust gas temperature reaches the set value, the oil-cooled solenoid valve 17 on the refrigerant oil-cooled liquid supply pipe 7 of the plate heat exchanger type oil cooler 3 is energized, so that the refrigerant liquid shunted from the main liquid path of the unit is conducted to the plate heat exchanger type oil cooler 3, flows through the oil-cooled expansion valve 5 and throttles and expands into a low-temperature and low-pressure refrigerant liquid, enters the plate heat exchanger type oil cooler 3 and indirectly exchanges heat with the relatively high-temperature refrigerating oil liquid in the oil path, thereby reducing the temperature of the refrigerating oil liquid, enabling it to be fully cooled, and further reducing the exhaust gas temperature of the high-pressure section of the refrigeration system. At the same time, the refrigerant liquid after throttling and expansion on the refrigerant side of the plate heat exchanger type oil cooler 3 vaporizes after absorbing the heat of the refrigerating oil liquid, and finally flows into the suction port of the compressor 16 in the refrigeration system. Due to the increase in the intake air volume (equivalent to the increase in the pressure on the suction side of the low-pressure end), the compression effect of the compressor 16 is improved. Because the refrigerant gas entering the compression chamber is at a low temperature, the temperature of the compression chamber can be reduced, and further the exhaust gas temperature of the high-pressure side of the compressor 16 is also reduced. The reduction of the exhaust gas temperature also makes the operating condition of the entire refrigeration unit more superior and the energy efficiency higher.

[0023] To sum up, this device can significantly improve the operating condition and operating efficiency of the refrigeration unit. The structure and manufacturing of this design are simple, with few components, small volume, convenient connection, stable performance, high reliability, and low cost. It has strong practicability, can be widely promoted on a large scale, can improve the stable operation, energy efficiency improvement, and energy conservation and emission reduction of low-temperature refrigeration units. The content not described in detail in this specification belongs to the prior art well-known to those skilled in the art.

[0024] The above description is only a preferred embodiment of the present application and an explanation of the applied technical principles. Those skilled in the art should understand that the scope of the utility model involved in the present application is not limited to the technical solution formed by the specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept of the utility model. For example, the technical solution formed by mutually replacing the above features with the technical features (but not limited to) having similar functions disclosed in the present application.

Claims

1. A refrigeration system using a secondary heat exchange device to reduce the temperature of refrigeration oil, comprising an evaporator (1), characterized in that: A condenser (8) is arranged below the evaporator (1), a compressor (16) is arranged above the evaporator (1), an exhaust shut-off valve (14) is installed at the upper end of the compressor (16), the exhaust shut-off valve (14) and the condenser (8) are connected via an exhaust pipe (2), a plate-change oil cooler (3) is installed at the middle of the upper end of the condenser (8), an oil-cooling liquid supply pipe (7) is installed on one side of the plate-change oil cooler (3) near the bottom, one end of the oil-cooling liquid supply pipe (7) is connected to the supercooling main liquid pipe (10), an oil-cooling solenoid valve (17) is installed on the oil-cooling liquid supply pipe (7), an oil-cooling expansion valve (5) is installed on the oil-cooling liquid supply pipe (7) and located on the right side of the oil-cooling solenoid valve (17), and an oil-cooling return air pipe is installed on one side of the plate-change oil cooler (3) near the top (4), an oil inlet pipe (13) is installed on one side of the plate-change oil cooler (3) and located on one side of the oil-cooling return pipe (4), one end of the oil inlet pipe (13) is connected to the oil outlet of the compressor (16), an oil outlet pipe (6) is provided on one side of the plate-change oil cooler (3) near the bottom and located on one side of the oil-cooling liquid supply pipe (7), one end of the oil outlet pipe (6) is connected to the oil inlet of the compressor (16), a return pipe (12) is provided on one side of the end of the evaporator (1), the end of the evaporator (1) and located below the return pipe (12) is connected to the subcooling main liquid pipe (10), one end of the oil-cooling return pipe (4) is connected to the return pipe (12), the other end of the return pipe (12) is connected to the compressor (16), and an electric control box (15) is provided obliquely behind the compressor (16).

2. A refrigeration system using a secondary heat exchange device to reduce the temperature of refrigeration oil according to claim 1, characterized in that: The return air pipe (12) is provided with a return air shut-off valve (11).

3. A refrigeration system using a secondary heat exchange device to reduce the temperature of refrigeration oil according to claim 1, characterized in that: A main liquid circuit expansion valve (9) is installed on the subcooling main liquid pipe (10), and the number of the main liquid circuit expansion valves (9) is set to two.

4. A refrigeration system using a secondary heat exchange device to reduce the temperature of refrigeration oil according to claim 1, characterized in that: The oil cooling air return pipe (4) and the oil inlet pipe (13) are arranged symmetrically about the front and rear axes of the plate-changing oil cooler (3).

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