CN216953598U

CN216953598U - Open-type variable-frequency two-stage screw unit refrigerating system

Info

Publication number: CN216953598U
Application number: CN202220099712.3U
Authority: CN
Inventors: 教百玲; 董艳; 于潇
Original assignee: Both Refrigertion Dalian Co ltd
Current assignee: Both Refrigertion Dalian Co ltd
Priority date: 2022-01-15
Filing date: 2022-01-15
Publication date: 2022-07-12
Anticipated expiration: 2032-01-15

Abstract

The utility model discloses an open-type variable-frequency two-stage screw unit refrigerating system, which relates to the technical field of refrigerating systems and comprises a compressor, an oil separator, an oil plate heat exchanger and an economizer, wherein the upper end and the lower end of the compressor are respectively connected with a compressor air inlet pipe and a compressor exhaust pipe, the other end of the compressor exhaust pipe is mutually connected with the oil separator, the left side of the oil separator is communicated with the compressor air inlet pipe through a compression return pipe, the right lower end of the oil separator is connected with the oil plate heat exchanger through an oil outlet pipe, and the left lower end of the oil plate heat exchanger is connected to the middle part of the compressor through an oil supply pipe. The utility model adopts the compressor comprising the compressor, the oil separator, the oil plate heat exchanger and the economizer, adopts the double-screw compressor, has high compression ratio, frequency conversion control, good refrigeration effect, stable performance, energy conservation and environmental protection, and has the energy conservation effect of more than 10 percent in the application of the instant freezer; the energy-saving effect in the application of the quick-freezing warehouse is about more than 15 percent; the energy-saving effect in the freezer with the temperature below minus 25 ℃ reaches more than 20 percent.

Description

Open-type variable-frequency two-stage screw unit refrigerating system

Technical Field

The utility model relates to the technical field of refrigeration systems, in particular to an open-type variable-frequency two-stage screw unit refrigeration system.

Background

Today, there are many types of cryogenic refrigerators on the screw compressor market. However, some refrigerators are actually reformed based on air conditioners, although such products can also be used for refrigerating, the operating cost under the working condition is higher than that of the real low-temperature products, for refrigeration, especially for low-temperature refrigeration and quick-freezing, the evaporation temperature is lower, the suction and exhaust pressure difference of a compressor is larger, and most of small and medium-sized items at present do not have strict requirements on the fluctuation of the storage temperature, so that most of screw machines in the market adopt plungers as energy-adjusting structures to avoid the larger influence of a larger gap between a slide valve and a rotor on the leakage of the rotor under the working condition of large pressure difference so as to improve the energy efficiency; only by the optimization, when the screw compressor is operated under the low-temperature working condition, the efficiency of the low-temperature screw in full load can be improved by about 10% compared with the energy efficiency of a middle-low screw modified by an air conditioner screw, and the lower the evaporation temperature is, the larger the improvement amplitude is, so that engineers continuously carry out optimization research and development on improving the compression ratio and energy conservation, technicians of the company design an open-type variable-frequency two-stage screw compressor unit refrigerating system, and the compression ratio and energy conservation are improved greatly.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide an open-type variable-frequency two-stage screw unit refrigerating system to solve the problems in the background technology.

In order to achieve the purpose, the utility model provides the following technical scheme: open-type frequency conversion doublestage screw unit refrigerating system, including compressor, oil separator, oil slab heat exchanger and economic ware, the upper and lower end of compressor is connected with compressor intake pipe and compressor blast pipe respectively, the other end and the oil separator interconnect of compressor blast pipe, the left side of oil separator is passed through compression muffler and compressor intake pipe intercommunication, the right lower extreme of oil separator is connected with the oil slab heat exchanger through an oil pipe, the left lower extreme of oil slab heat exchanger is through supplying oil union coupling at the middle part of compressor.

Further: the compressor adopts double screw compressor to include the motor on the compressor, the left end of motor is connected with screw compressor, and the upper and lower end of compressor is equipped with compressor import and compressor export, the middle part of compressor is equipped with the lubrication mouth, and compressor intake pipe and compressor blast pipe are connected respectively to compressor import and compressor export, the oil pipe is supplied in lubrication mouth connection.

Preferably: and the left side of the outlet of the compressor is provided with an air supplement port, and the air supplement port is connected with the economizer through an economizer air supplement pipe.

Further: the top and the bottom of oil separator are equipped with gas vent and drain respectively, separation temperature sensor and oil supplementing mouth are installed to the left side of oil separator, high pressure switch and exhaust pressure sensor are installed to the right side of oil separator.

Further: the oil plate heat exchanger is characterized in that a heat exchange outlet pipe and a heat exchange inlet pipe are connected to the left side of the oil plate heat exchanger from top to bottom, and a drying filter, an oil mixing valve, an oil filter and an oil supply temperature sensor are sequentially installed on an oil supply pipe connected to the right side of the oil plate heat exchanger from left to right.

Preferably: the oil supply pipe is communicated with the compressor air inlet pipe through an oil supply branch pipe, and a loading electromagnetic valve is arranged at the middle upper end of the oil supply pipe.

Preferably: and the air inlet pipe of the compressor is provided with a check valve and an air suction temperature sensor.

Preferably: and a stop valve is arranged on the compression air return pipe.

Compared with the prior art, the utility model has the beneficial effects that: the utility model adopts the compressor comprising the compressor, the oil separator, the oil plate heat exchanger and the economizer, and the compressor adopts a double-screw compressor, so that the compression ratio is high, the frequency conversion control is realized, the refrigeration effect is good, the performance is stable, the energy is saved, the environment is protected, the technical performance comparison analysis is carried out, and the energy saving effect is about more than 10 percent in the application of the instant freezer; the energy-saving effect in the application of the quick-freezing warehouse is about more than 15 percent; the energy-saving effect in the freezer with the temperature below minus 25 ℃ reaches more than 20 percent.

Drawings

FIG. 1 is a schematic diagram of the system of the present invention;

FIG. 2 is an enlarged schematic view of a portion of the compressor;

FIG. 3 is an enlarged schematic view of an oil separator;

fig. 4 is a schematic view of an oil plate heat exchanger.

In the figure: 1. The system comprises a compressor, 2, a compressor air inlet pipe, 3, a compressor exhaust pipe, 4, an oil supply pipe, 5, an oil supply shunt pipe, 6, a compression return air pipe, 7, an oil separator, 8, an oil outlet pipe, 9, an oil plate heat exchanger, 10, an economizer air supplement pipe, 11, an economizer, 12, a loading electromagnetic valve, 101, a motor, 102, a screw compressor, 103, a compressor inlet, 104, a lubricating port, 105, a compressor outlet, 106, an air supplement port, 701, an exhaust port, 702, a separation temperature sensor, 703, an oil supplement port, 704, a sewage discharge port, 705, a high-pressure switch, 706, an exhaust pressure sensor, 901, a heat exchange outlet pipe, 902, a heat exchange inlet pipe, 903, a drying filter, 904, an oil mixing valve, 905, an oil filter, 906 and an oil supply temperature sensor.

Detailed Description

The present invention will hereinafter be described based on embodiments with reference to the drawings in the embodiments of the present invention, but it should be noted that the present invention is not limited to these embodiments, and in the following detailed description of the present invention, some specific details are described in detail, however, for those parts not described in detail, the present invention can be fully understood by those skilled in the art.

Furthermore, those skilled in the art will appreciate that the drawings are provided solely for the purposes of illustrating the utility model, features and advantages thereof, and are not necessarily drawn to scale.

Also, unless the context clearly requires otherwise, throughout the description and the claims, the words "comprise", "comprising", and the like are to be construed in an inclusive sense as opposed to an exclusive or exhaustive sense; that is, the meaning of "includes but is not limited to".

Referring to fig. 1-4, the present invention provides a technical solution: including compressor 1, oil separator 7, oiled-plate heat exchanger 9 and economic ware 11, its characterized in that: the upper end and the lower end of the compressor 1 are respectively connected with a compressor air inlet pipe 2 and a compressor exhaust pipe 3, the other end of the compressor exhaust pipe 3 is connected with an oil separator 7, the left side of the oil separator 7 is communicated with the compressor air inlet pipe 2 through a compression air return pipe 6, the right lower end of the oil separator 7 is connected with an oil plate heat exchanger 9 through an oil outlet pipe 8, and the left lower end of the oil plate heat exchanger 9 is connected to the middle of the compressor 1 through an oil supply pipe 4.

The compressor 1 adopts the double screw compressor to include motor 101 on the compressor 1, the left end of motor 101 is connected with screw compressor 102, and the upper and lower end of compressor 1 is equipped with compressor inlet 103 and compressor outlet 105, the middle part of compressor 1 is equipped with lubrication mouth 104, and compressor inlet 103 and compressor outlet 105 connect compressor intake pipe 2 and compressor blast pipe 3 respectively, lubrication mouth 104 connects and supplies oil pipe 4.

The left side of the compressor outlet 105 is provided with an air supplement port 106, and the air supplement port 106 is connected with the economizer 11 through an economizer air supplement pipe 10.

The uppermost end and the lowermost end of the oil separator 7 are respectively provided with an exhaust port 701 and a sewage draining exit 704, the left side of the oil separator 7 is provided with a separation temperature sensor 702 and an oil supplementing port 703, and the right side of the oil separator 7 is provided with a high-pressure switch 705 and an exhaust pressure sensor 706.

A heat exchange outlet pipe 901 and a heat exchange inlet pipe 902 are connected to the left side of the oil plate heat exchanger 9 from top to bottom, and a drying filter 903, an oil mixing valve 904, an oil filter 905 and an oil supply temperature sensor 906 are sequentially installed on an oil supply pipe 4 connected to the right side of the oil plate heat exchanger 9 from left to right.

The oil supply pipe 4 is communicated with the compressor air inlet pipe 2 through an oil supply shunt pipe 5, and a loading electromagnetic valve 12 is arranged at the middle upper end of the oil supply pipe 4.

And a check valve and an air suction temperature sensor are arranged on the air inlet pipe 2 of the compressor.

And a stop valve is arranged on the compression air return pipe 6.

When the utility model is used, the refrigerant enters the compressor 1 through the compressor air inlet pipe 2 after the evaporator finishes working, the compressor 1 liquefies the refrigerant through working, the refrigerant enters the oil separator 7 through the compression exhaust pipe 3 in a gas-liquid mixed state, the treated part carries out refrigeration work on the evaporator through the exhaust port 701, the other part of the gas which is not compressed returns to the compressor air inlet pipe 2 through the compression return pipe 6 to be continuously compressed, the lubricating oil filtered by the oil separator 7 returns to the oil plate heat exchanger 9 to continuously lubricate the compressor 1, the compressor air inlet pipe 2 is also provided with an oil supply shunt pipe 5 to lubricate the inlet of the compressor 1, the compressor 1 is connected with the economizer 11 for the conventional operation of the industry, the system is mainly designed to enhance the compression ratio, increase the lubrication, reduce the friction and prolong the service life of the compressor, and the whole system is stable, and is more energy-saving and environment-friendly.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.

Claims

1. Open-type frequency conversion doublestage screw unit refrigerating system, including compressor (1), oil separator (7), oiled-plate heat exchanger (9) and economic ware (11), its characterized in that: the upper and lower end of compressor (1) is connected with compressor intake pipe (2) and compressor blast pipe (3) respectively, the other end and oil separator (7) interconnect of compressor blast pipe (3), the left side of oil separator (7) is through compression muffler (6) and compressor intake pipe (2) intercommunication, the right lower extreme of oil separator (7) is connected with oil slab heat exchanger (9) through going out oil pipe (8), the middle part at compressor (1) is connected through supplying oil pipe (4) to the left lower extreme of oil slab heat exchanger (9).

2. The open-type variable-frequency two-stage screw unit refrigerating system according to claim 1, characterized in that: compressor (1) adopts double screw compressor to include motor (101) on compressor (1), the left end of motor (101) is connected with screw compressor (102), and the upper and lower end of compressor (1) is equipped with compressor inlet (103) and compressor outlet (105), the middle part of compressor (1) is equipped with lubrication mouth (104), and compressor inlet (103) and compressor outlet (105) are connected compressor intake pipe (2) and compressor blast pipe (3) respectively, lubrication mouth (104) are connected and are supplied oil pipe (4).

3. The open-type variable-frequency two-stage screw unit refrigerating system according to claim 2, wherein: the left side of the compressor outlet (105) is provided with an air supplement port (106), and the air supplement port (106) is connected with the economizer (11) through an economizer air supplement pipe (10).

4. The open-type variable-frequency two-stage screw unit refrigerating system according to claim 1, characterized in that: the oil separator is characterized in that the uppermost end and the lowermost end of the oil separator (7) are respectively provided with an exhaust port (701) and a sewage draining outlet (704), a separation temperature sensor (702) and an oil supplementing port (703) are installed on the left side of the oil separator (7), and a high-pressure switch (705) and an exhaust pressure sensor (706) are installed on the right side of the oil separator (7).

5. The open-type variable-frequency two-stage screw unit refrigerating system according to claim 1, characterized in that: the oil-mixing device is characterized in that a heat exchange outlet pipe (901) and a heat exchange inlet pipe (902) are connected to the upper portion and the lower portion of the left side of the oil plate heat exchanger (9), and an oil supply pipe (4) connected to the right side of the oil plate heat exchanger (9) is sequentially provided with a drying filter (903), an oil mixing valve (904), an oil filter (905) and an oil supply temperature sensor (906) from left to right.

6. The open-type variable-frequency two-stage screw unit refrigerating system according to claim 1, characterized in that: the oil supply pipe (4) is communicated with the compressor air inlet pipe (2) through an oil supply shunt pipe (5), and a loading electromagnetic valve (12) is arranged at the middle upper end of the oil supply pipe (4).

7. The open-type variable-frequency two-stage screw unit refrigerating system according to claim 1, characterized in that: and a check valve and an air suction temperature sensor are arranged on the air inlet pipe (2) of the compressor.

8. The open-type variable-frequency two-stage screw unit refrigerating system according to claim 1, characterized in that: and a stop valve is arranged on the compression air return pipe (6).