CN115164431A

CN115164431A - Injection refrigerating system

Info

Publication number: CN115164431A
Application number: CN202210834474.0A
Authority: CN
Inventors: 陈斌; 尚惠青; 王传华; 石伟
Original assignee: Gree Electric Appliances Inc of Zhuhai
Current assignee: Gree Electric Appliances Inc of Zhuhai
Priority date: 2022-07-14
Filing date: 2022-07-14
Publication date: 2022-10-11

Abstract

The invention discloses an injection refrigeration system which comprises a compressor, a condenser, an evaporator, a gas-liquid separator and an injector, wherein outlet pipelines of the condenser and the evaporator are respectively communicated with two inlets of the injector, the outlet pipeline of the injector is communicated with the gas-liquid separator, a gas outlet of the gas-liquid separator is communicated with a gas suction pipe of the compressor, a liquid outlet of the gas-liquid separator is communicated with the evaporator through a pipeline, and an electronic expansion valve is arranged on a gas inlet pipeline of the evaporator. Be equipped with a bypass between the business turn over pipeline of condenser, be equipped with bypass valve and condensation re-heater on the bypass in proper order, the condensation re-heater sets up the air outlet of evaporimeter is used for heating the air supply. The invention well solves the technical problems of mechanical energy loss generated by the throttling device and high energy consumption for keeping indoor air supply constant temperature and humidity.

Description

Injection refrigerating system

Technical Field

The invention relates to the technical field of air conditioners, in particular to an injection refrigeration system.

Background

With the progress of science and technology, the living standard of people is improved, and the energy consumption is increased. The energy consumption of buildings has become the great head, wherein the energy consumption of the heating, ventilating and air conditioning industry accounts for most of the energy consumption. Under the background of the times of 'carbon peak reaching and carbon neutralization', energy conservation and emission reduction are in need. In a traditional vapor compression refrigeration system, an expansion valve is adopted for throttling and depressurizing, so that high-pressure working media are throttled to cause mechanical energy loss and influence the system performance. For some special occasions, the temperature and humidity in a control room are required to be kept constant, the humidity is controlled by adopting an electric heating mode in the traditional method, and the condensation heat generated in a refrigeration system is not fully utilized, so that the energy waste is also caused.

Disclosure of Invention

The invention provides an injection refrigeration system, which aims to solve the technical problems that an expansion valve generates mechanical energy loss and the energy consumption for keeping indoor air supply constant temperature and humidity is high in the prior art.

The invention provides an injection refrigerating system, which comprises a compressor, a condenser, an evaporator, a gas-liquid separator and an injector, wherein outlet pipelines of the condenser and the evaporator are respectively communicated with two inlets of the injector; a bypass is arranged between the inlet and outlet pipelines of the condenser, a bypass valve and a condensation reheater are sequentially arranged on the bypass, and the condensation reheater is arranged at an air outlet of the evaporator and used for heating air supply.

Preferably, the bypass valve is an infinitely adjustable electric bypass valve.

Preferably, the ejector is a Laval nozzle with a needle.

In one embodiment, the condenser is a finned tube heat exchanger and is placed outdoors.

In another embodiment, the condenser adopts a shell-and-tube heat exchanger, and the condensation heat is used for heating domestic hot water.

Preferably, the evaporator and the condenser reheater are formed as a module and share a common fan.

Compared with the prior art, the invention has the following beneficial effects:

1. an ejector (or an ejector) is adopted to replace a throttling device in the traditional vapor compression refrigeration cycle, so that throttling loss can be effectively reduced, and the system performance is improved.

2. The supercooling refrigerant passing through the condensation reheater and the refrigerant at the outlet of the condenser are converged together and enter the ejector, so that the supercooling degree of the refrigerant entering the evaporator can be further increased, and the energy efficiency ratio of the system is improved.

3. Design condensation reheater in drawing penetrating refrigerating system carries out the reheat to the evaporimeter air-out, solves the power consumption problem that traditional constant temperature and humidity machine adopted the electrical heating to improve air supply temperature and brought, can retrieve partial condensation heat simultaneously, avoids the energy extravagant.

Drawings

The invention is described in detail below with reference to the following figures and specific examples, wherein:

fig. 1 is a schematic diagram of an injection refrigeration system according to the present invention;

figure 2 is a schematic view of a faraday nozzle with a needle.

In the figure: the system comprises a compressor 1, a condenser 2, a condenser 3, a reheater 4, an evaporator 5, an ejector 5, a gas-liquid separator 6, an electronic expansion valve 7, a bypass valve 8, a blower 9, nozzles 10 and spray needles 11.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in detail with reference to the accompanying drawings and examples. It should be understood that the following specific examples are only for illustrating the present invention and are not to be construed as limiting the present invention.

As shown in fig. 1, the ejector refrigeration system provided by the invention comprises a compressor 1, a condenser 2, an evaporator 4, an ejector 5 and a gas-liquid separator 6 which are sequentially communicated by pipelines. The outlet pipelines of the condenser and the evaporator are respectively communicated with two inlets of the ejector 5, the outlet pipeline of the ejector is communicated with the gas-liquid separator 6, the gas outlet of the gas-liquid separator is communicated with the air suction pipe of the compressor 1, the liquid outlet of the gas-liquid separator is communicated with the inlet pipeline of the evaporator, and the inlet pipeline of the evaporator is provided with an electronic expansion valve 7.

A bypass is further arranged between the inlet and outlet pipelines of the condenser 2, a bypass valve 8 and a condensation reheater 3 are sequentially arranged on the bypass, and the condensation reheater and the evaporator 4 are arranged together and are located at an air outlet of the evaporator and used for heating indoor air supply.

The ejector is a pressure device which can mix two fluids with different pressures with each other, exchange energy and form a mixed fluid, and can improve the ejection fluid without directly consuming mechanical energy. The ejector refrigeration system provided by the invention adopts an ejector (or an ejector) to replace a throttling device in the traditional vapor compression refrigeration cycle, thereby effectively reducing throttling loss and improving system performance. On the other hand, the refrigerant passing through the condensation reheater and the refrigerant at the outlet of the condenser are converged and enter the ejector, so that the supercooling degree of the refrigerant entering the evaporator can be further increased, and the energy efficiency ratio of the system is improved.

As shown in fig. 2, the ejector 5 of the present invention may be an electric ejector, for example, a faraday nozzle 10 having a nozzle 11 at its throat, and the effective flow cross-sectional area (that is, the throat cross-sectional area) of the nozzle throat is adjusted by adjusting the depth of the nozzle throat into which the nozzle is screwed, so as to achieve the purpose of adjusting the ejector ratio (ejector ratio = ejected flow/main ejector flow). The injection ratio can change the speed of the refrigerant ejected from the ejector, thereby controlling the flow.

As a preferred embodiment, the indoor evaporator 4 and the condensing evaporator 3 can be formed as a module, and share a blower 9, which facilitates installation and space utilization.

A condensation reheater is added in the system, and the problem of energy consumption of a traditional constant temperature and humidity machine for heating air supply in an electric heating mode is solved.

When the high-temperature high-pressure gas refrigerant compressed by the compressor 1 works, the high-temperature high-pressure gas refrigerant is divided into two parts, one part of the high-temperature high-pressure gas refrigerant enters the outdoor condenser 2, the other part of the high-temperature high-pressure gas refrigerant enters the indoor condenser reheater 3 through the bypass valve 8, and the two parts of the high-temperature high-pressure gas refrigerant are converged after heat exchange and then enter the ejector 5 as main ejection flow. The refrigerant discharged by the ejector enters the gas-liquid separator 6, the low-temperature low-pressure gaseous refrigerant in the gas-liquid separator 6 enters the compressor 1 through the air suction pipe for compression, and the low-temperature low-pressure liquid refrigerant at the bottom of the gas-liquid separator 6 enters the evaporator 4 for evaporation and heat absorption after being throttled by the electronic expansion valve 7. The low-temperature and low-pressure refrigerant from the evaporator exchanges heat with air and then enters the ejector 5 as an ejected flow through the ejection port, is mixed with the main ejected flow and then ejected, and enters the gas-liquid separator 6 together. And the air at the air outlet of the evaporator is heated by a condensation reheater 3 and then sent into a room.

The injection refrigeration system with the condensation reheater can meet the temperature and humidity requirements of special occasions, and meanwhile, the throttling valve is replaced by the injector to reduce throttling loss.

In the invention, the bypass valve 8 adopts a stepless adjustable electric bypass valve, and the flow of a refrigerant flowing through the indoor condensation reheater is controlled by adjusting the bypass valve through an electric signal so as to achieve the purpose of controlling the indoor air supply temperature and humidity.

The invention sets two condensers in the refrigeration system, one condenser is set outside the room, the other condenser is set inside the room. The condenser placed outdoors can be a finned tube heat exchanger or a shell and tube heat exchanger, and if the condenser is the shell and tube heat exchanger, the condensation heat generated by the outdoor condenser can be used for heating domestic hot water; the condenser placed indoors is used for heating the air supply passing through the indoor evaporator and increasing the temperature of the air supply.

The foregoing is considered as illustrative only of the embodiments of the invention. It should be understood that any modifications, equivalents and variations made within the spirit and framework of the inventive concept are intended to be included within the scope of the invention.

Claims

1. An injection refrigeration system comprises a compressor, a condenser, an evaporator and a gas-liquid separator, and is characterized by further comprising an injector, wherein outlet pipelines of the condenser and the evaporator are respectively communicated with two inlets of the injector; be equipped with a bypass between the business turn over pipeline of condenser, be equipped with bypass valve and condensation re-heater on the bypass in proper order, the condensation re-heater sets up the air outlet of evaporimeter is used for heating the air supply.

2. The injection refrigeration system as claimed in claim 1, wherein the bypass valve is an infinitely adjustable electric bypass valve.

3. The ejector refrigeration system of claim 1, wherein the ejector employs a Laval nozzle with a needle.

4. The ejector refrigeration system of claim 1 wherein the condenser is a finned tube heat exchanger.

5. The ejector refrigeration system as claimed in claim 1, wherein the condenser adopts a shell-and-tube heat exchanger, and the condensation heat is used for heating domestic hot water.

6. The ejector refrigeration system of claim 1 wherein the evaporator and the condenser reheater are formed as a module and share a common fan.