阅读说明：本技术 一种利用工质直膨油冷却的螺杆并联机组 (Screw parallel unit cooled by using working medium direct expansion oil ) 是由 李宗生 田洪运 郭相声 曹州阳 于 2021-01-17 设计创作，主要内容包括：本发明涉及一种利用工质直膨油冷却的螺杆并联机组,储液器的出液端连接安装有供液总管；供液总管上固定安装有第一截止阀；换热器的进液端与供液总管之间连接安装有供液支管；供液支管上依次固定安装有第一过滤器、第二截止阀、电磁阀和电子膨胀阀；电磁阀和电子膨胀阀之间连接安装有对接管；换热器的出气端与回气总管的进气端连接安装有回气支管；回气支管上固定安装有第三截止阀；换热器的出油端连接安装有回油管；回油管上依次固定安装有第四截止阀和油泵；本发明能够提供一种螺杆机组冷却效果好、冷却温度平衡以及设备无需额外添加部件安装简单的利用工质直膨油冷却的螺杆并联机组。(The invention relates to a screw parallel unit cooled by using working medium direct expansion oil, wherein a liquid outlet end of a liquid storage device is connected with a liquid supply main pipe; a first stop valve is fixedly arranged on the liquid supply main pipe; a liquid supply branch pipe is connected and installed between the liquid inlet end of the heat exchanger and the liquid supply main pipe; a first filter, a second stop valve, an electromagnetic valve and an electronic expansion valve are fixedly arranged on the liquid supply branch pipe in sequence; a butt joint pipe is connected and installed between the electromagnetic valve and the electronic expansion valve; the air outlet end of the heat exchanger is connected with the air inlet end of the air return main pipe and is provided with an air return branch pipe; a third stop valve is fixedly arranged on the air return branch pipe; an oil return pipe is connected and installed at the oil outlet end of the heat exchanger; a fourth stop valve and an oil pump are fixedly arranged on the oil return pipe in sequence; the screw parallel unit capable of cooling by using the working medium direct expansion oil has the advantages of good cooling effect, balanced cooling temperature, no need of extra parts for equipment and simplicity in installation.)

1. The utility model provides an utilize oily screw rod parallel unit of working medium direct expansion which characterized in that: comprises a liquid storage device (1), a heat exchanger (2), a separator (3) and a gas return main pipe (4); the liquid outlet end of the liquid storage device (1) is connected with a liquid supply main pipe (5); a first stop valve (6) is fixedly arranged on the liquid supply main pipe (5); a liquid supply branch pipe (7) is connected and mounted between the liquid inlet end of the heat exchanger (2) and the liquid supply main pipe (5); a first filter (8), a second stop valve (9), an electromagnetic valve (10) and an electronic expansion valve (11) are sequentially and fixedly arranged on the liquid supply branch pipe (7); a butt joint pipe (12) is connected and installed between the electromagnetic valve (10) and the electronic expansion valve (11); the air outlet end of the heat exchanger (2) is connected with the air inlet end of the air return header pipe (4) and is provided with an air return branch pipe (13); a third stop valve (14) is fixedly arranged on the air return branch pipe (13); an oil return pipe (15) is connected and mounted at the oil outlet end of the heat exchanger (2); a fourth stop valve (16) and an oil pump (17) are fixedly mounted on the oil return pipe (15) in sequence; a connecting pipe (18) is connected and installed between the butt joint pipe (12) and the oil inlet end of the oil pump (17); an oil temperature sensor (19) is fixedly arranged on the connecting pipe (18); an oil outlet pipe (20) is connected and mounted between the oil inlet end of the heat exchanger (2) and the oil outlet end of the separator (3); and a fifth stop valve (21), a second filter (22) and a sixth stop valve (23) are sequentially and fixedly mounted on the oil outlet pipe (20).

2. The screw parallel-connection machine cooled by using the working medium direct expansion oil as claimed in claim 1, wherein: the liquid inlet end of the liquid storage device (1) is connected with a liquid inlet pipe (24); and a seventh stop valve (25) is fixedly installed on the liquid inlet pipe (24).

3. The screw parallel-connection machine cooled by using the working medium direct expansion oil as claimed in claim 1, wherein: and an oil inlet pipe (26) is connected and installed at the oil inlet end of the separator (3).

4. The screw parallel unit cooled by using the direct expansion oil of the working medium according to claim 1, wherein: and an eighth stop valve (27) is fixedly mounted on the air return main pipe (4).

5. The screw parallel unit cooled by using the direct expansion oil of the working medium according to claim 1, wherein: the heat exchanger (2) is an oil cooling plate type heat exchanger.

6. The screw parallel unit cooled by using the direct expansion oil of the working medium according to claim 1, wherein: the air outlet end of the air return header pipe (4) is connected and installed with a cold air inlet pipe of an external compressor; the oil outlet end of the oil return pipe (15) is connected and installed with a low-temperature oil inlet pipe of an external compressor; the oil inlet end of the oil inlet pipe (26) is connected and installed with a high-temperature oil outlet pipe of an external compressor; and the liquid inlet end of the liquid inlet pipe (24) is connected and installed with the liquid outlet end of an external compressor.

Technical Field

The invention belongs to the technical field related to cooling equipment, and particularly relates to a screw parallel unit cooled by using working medium direct expansion oil.

Background

In the current large-scale freezer market, screw rod parallel unit relies on its stability and energy-conserving advantage, become the best selection of customer, screw compressor is whole refrigerating system's core component, whole system's operation has screw compressor drive, and oil cooling is the key place that screw compressor stablizes high-efficient operation, compressor unit inner loop's low temperature lubricating oil can reduce the exhaust temperature of compressor, form sealed oil film between screw compressor's rotor, reduce the interior rate of leaking between the rotor high-low pressure, promote compressor operating efficiency, reduce compressor running noise etc..

The existing oil-cooled screw parallel unit technology has the following problems: 1. air cooling and water cooling units are mostly adopted in the industry, and the air cooling can cause the temperature of a machine room to be abnormally increased, so that internal equipment is damaged due to high temperature; the number of water cooling accessories is large, and the heat exchange efficiency is gradually reduced along with the time; 2. working medium siphon cooling units are adopted in the industry, although the cooling effect is good, the siphon oil cooling units need to additionally weld parts such as siphon tanks and pipelines on site, time and labor are wasted, and equipment is more complex.

Disclosure of Invention

The invention aims to provide a screw parallel unit which is cooled by using working medium direct expansion oil and has the advantages of good cooling effect of the screw unit, balanced cooling temperature and simple installation of equipment without adding extra parts.

In order to achieve the purpose, the invention provides the following technical scheme: a screw parallel unit cooled by using working medium direct expansion oil comprises a liquid storage device, a heat exchanger, a separator and a gas return main pipe; the liquid outlet end of the liquid storage device is connected with a liquid supply main pipe; a first stop valve is fixedly arranged on the liquid supply main pipe; a liquid supply branch pipe is connected and mounted between the liquid inlet end of the heat exchanger and the liquid supply main pipe; a first filter, a second stop valve, an electromagnetic valve and an electronic expansion valve are fixedly arranged on the liquid supply branch pipe in sequence; a butt joint pipe is connected and installed between the electromagnetic valve and the electronic expansion valve; the air outlet end of the heat exchanger is connected with the air inlet end of the air return main pipe and is provided with an air return branch pipe; a third stop valve is fixedly arranged on the air return branch pipe; an oil return pipe is connected and mounted at the oil outlet end of the heat exchanger; a fourth stop valve and an oil pump are fixedly arranged on the oil return pipe in sequence; a connecting pipe is connected and installed between the butt joint pipe and the oil inlet end of the oil pump; an oil temperature sensor is fixedly arranged on the connecting pipe; an oil outlet pipe is connected and installed between the oil inlet end of the heat exchanger and the oil outlet end of the separator; and a fifth stop valve, a second filter and a sixth stop valve are sequentially and fixedly mounted on the oil outlet pipe.

As a further improvement of the invention, the liquid inlet end of the liquid storage device is connected with and provided with a liquid inlet pipe; and a seventh stop valve is fixedly installed on the liquid inlet pipe.

As a further improvement of the invention, the oil inlet end of the separator is connected with an oil inlet pipe.

As a further improvement of the present invention, an eighth stop valve is fixedly mounted on the air return manifold.

As a further improvement of the invention, the heat exchanger is an oil cooling plate type heat exchanger.

As a further improvement of the invention, the air outlet end of the air return header pipe is connected and installed with a cold air inlet pipe of an external compressor; the oil outlet end of the oil return pipe is connected and installed with a low-temperature oil inlet pipe of an external compressor; the oil inlet end of the oil inlet pipe is connected and installed with a high-temperature oil outlet pipe of an external compressor; and the liquid inlet end of the liquid inlet pipe is connected and installed with the liquid outlet end of the external compressor.

Compared with the prior art, the invention has the beneficial effects that: according to the technical scheme, a liquid supply main pipe and a liquid supply branch pipe are arranged between a liquid storage device and a heat exchanger, a first stop valve, a first filter second stop valve, an electromagnetic valve and an electronic expansion valve are arranged on the liquid supply main pipe and the liquid supply branch pipe, and liquid can be effectively conveyed to the heat exchanger through the liquid supply branch pipe; the liquid conveying can be closed or opened in real time through the first stop valve and the second stop valve; impurities in the liquid can be effectively filtered through the first filter, so that the equipment is prevented from being damaged by the impurities; the flow direction, the flow rate, the flow velocity and the like of the liquid can be controlled in real time through the electromagnetic valve and the electronic expansion valve; according to the technical scheme, the air return branch pipe is arranged between the heat exchanger and the air return main pipe, and low-temperature and low-pressure cold air after heat exchange can be effectively led out through the air return branch pipe; according to the technical scheme, the heat exchanger is further provided with an oil return pipe, the oil return pipe is provided with an oil pump, the oil return pipe and the butt joint pipe are provided with connecting pipes, the connecting pipes are provided with oil temperature sensors, and low-temperature lubricating oil after heat exchange can be effectively led out through the oil return pipe; the oil pump can more quickly convey the lubricating oil; the oil temperature sensor can facilitate the working personnel to know the temperature of the lubricating oil in real time; according to the technical scheme, the heat exchanger and the separator are provided with the oil outlet pipe, the oil outlet pipe is provided with the European fifth stop valve, the European second filter and the European sixth stop valve, and high-temperature lubricating oil in the separator can be effectively guided into the heat exchanger through the oil outlet pipe to be cooled and exchanged heat; the fifth stop valve and the sixth stop valve can effectively control the opening or closing of the lubricating oil; the filter can filter the impurity of lubricating oil inside, avoids impurity to cause the damage to the heat exchanger.

Drawings

Fig. 1 is a schematic view of the overall structure of the present invention.

In the figure: 1. a reservoir; 2. a heat exchanger; 3. a separator; 4. a main air return pipe; 5. a liquid supply main pipe; 6. a first shut-off valve; 7. a branch liquid supply pipe; 8. a first filter; 9. a second stop valve; 10. an electromagnetic valve; 11. an electronic expansion valve; 12. butt-joint pipes; 13. a return air branch pipe; 14. a third stop valve; 15. an oil return pipe; 16. a fourth stop valve; 17. an oil pump; 18. a connecting pipe; 19. an oil temperature sensor; 20. an oil outlet pipe; 21. a fifth stop valve; 22. a second filter; 23. a sixth stop valve; 24. a liquid inlet pipe; 25. a seventh stop valve; 26. an oil inlet pipe; 27. and an eighth stop valve.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1, the present invention provides a technical solution: a screw rod parallel unit cooled by using working medium direct expansion oil comprises a liquid storage device 1, a heat exchanger 2, a separator 3 and a gas return header pipe 4; the liquid outlet end of the liquid storage device 1 is connected with a liquid supply main pipe 5; a first stop valve 6 is fixedly arranged on the liquid supply main pipe 5; a liquid supply branch pipe 7 is connected and installed between the liquid inlet end of the heat exchanger 2 and the liquid supply main pipe 5; a first filter 8, a second stop valve 9, an electromagnetic valve 10 and an electronic expansion valve 11 are sequentially and fixedly arranged on the liquid supply branch pipe 7; a butt joint pipe 12 is connected and installed between the electromagnetic valve 10 and the electronic expansion valve 11; the air outlet end of the heat exchanger 2 is connected with the air inlet end of the air return header pipe 4 and is provided with an air return branch pipe 13; a third stop valve 14 is fixedly arranged on the air return branch pipe 13; the oil outlet end of the heat exchanger 2 is connected with an oil return pipe 15; a fourth stop valve 16 and an oil pump 17 are sequentially and fixedly arranged on the oil return pipe 15; a connecting pipe 18 is connected and installed between the butt joint pipe 12 and the oil inlet end of the oil pump 17; an oil temperature sensor 19 is fixedly arranged on the connecting pipe 18; an oil outlet pipe 20 is connected and installed between the oil inlet end of the heat exchanger 2 and the oil outlet end of the separator 3; a fifth stop valve 21, a second filter 22 and a sixth stop valve 23 are fixedly arranged on the oil outlet pipe 20 in sequence; the liquid inlet end of the liquid storage device 1 is connected with a liquid inlet pipe 24; a seventh stop valve 25 is fixedly arranged on the liquid inlet pipe 24; the oil inlet end of the separator 3 is connected with an oil inlet pipe 26; an eighth stop valve 27 is fixedly arranged on the air return main pipe 4; the heat exchanger 2 is an oil cooling plate type heat exchanger; the air outlet end of the air return header pipe 4 is connected with a cold air inlet pipe of an external compressor; the oil outlet end of the oil return pipe 15 is connected and installed with a low-temperature oil inlet pipe of an external compressor; the oil inlet end of the oil inlet pipe 26 is connected and installed with the high-temperature oil outlet pipe of the external compressor; the liquid inlet end of the liquid inlet pipe 24 is connected with the liquid outlet end of the external compressor.

The working principle and the using process of the invention are as follows: after the device is installed, a power supply is switched on, at the moment, condensed liquid in the liquid reservoir 1 flows into the heat exchanger 2 through the liquid supply main pipe 5 and the liquid supply branch pipes 7 to be evaporated, and low-temperature low-pressure gas formed after evaporation enters an external compressor through the gas return branch pipes 13 and the gas return main pipe 4 to be refrigerated; meanwhile, high-temperature lubricating oil generated by an external compressor enters the separator 3 through the oil inlet pipe 26 for oil-gas separation, and the separated high-temperature lubricating oil enters the heat exchanger 2 through the oil outlet pipe 20 for heat exchange; finally, the lubricating oil cooled by heat exchange flows back to the external compressor for lubrication through the oil return pipe 15.

Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.