Screw compression multi-temperature zone system with double air injection

Abstract

The present invention discloses a screw compression multi-temperature zone system with injection and twice air replenishment, comprising a screw compressor, a condenser whose inlet is connected to the outlet of the screw compressor, two gas-liquid separators and a third evaporator connected to three of the four outlets of the condenser through throttle valves, respectively, the liquid outlets of the two gas-liquid separators are respectively connected to the liquid inlets of the first and second evaporators, the gas outlets of the first, second and third evaporators are respectively connected to the injection fluid inlets of the first, second and third ejectors, the pressure-expanding outlets of the first, second and third ejectors are respectively connected to the air intake of the screw compressor and the two air replenishment ports; the main fluid inlet of the first ejector is connected to one of the four outlets of the condenser, and the main fluid inlets of the second and third ejectors are respectively connected to the gas outlets of the two gas-liquid separators. The present invention uses an ejector to inject the gas formed by the heat absorption and evaporation of the refrigerant liquid in the evaporator, and twice intermediate air replenishment, so as to realize multi-temperature zone cooling and heating.

Description

Technical Field

[0001] The present invention relates to the technical field of refrigeration, and particularly to a screw compression multi-temperature zone system with two-stage air injection by jet ejector. Background Art

[0002] Energy waste and resource shortage are common problems faced by today's society. Refrigeration and air-conditioning systems consume energy. How to efficiently and reasonably utilize energy is an urgent problem to be solved. Summary of the Invention

[0003] The purpose of the present invention is to provide a screw compression multi-temperature zone system with two-stage air injection by jet ejector in view of the defects of the prior art.

[0004] The technical solution adopted to achieve the purpose of the present invention is as follows:

[0005] The screw compression multi-temperature zone system with two-stage air injection by jet ejector of the present invention includes a screw compressor. The outlet of the screw compressor is connected to the inlet of a condenser. The outlet of the condenser is divided into four paths. The first path is connected to the main fluid inlet of a first ejector. The second path is connected to the mixed fluid inlet of a first gas-liquid separator through a first throttle valve. The third path is connected to the mixed fluid inlet of a second gas-liquid separator through a second throttle valve. The fourth path is connected to the inlet of a third evaporator through a third throttle valve. The liquid outlet of the first gas-liquid separator is connected to the liquid inlet of a first evaporator. The gas outlet of the first evaporator is connected to the entrained fluid inlet of the first ejector. The diffuser outlet of the first ejector is connected to the second air injection port of the screw compressor near the exhaust end. The gas outlet of the first gas-liquid separator is connected to the main fluid inlet of a second ejector. The diffuser outlet of the second ejector is connected to the first air injection port of the screw compressor near the suction end. The gas outlet of the second gas-liquid separator is connected to the main fluid inlet of a third ejector. The diffuser outlet of the third ejector is connected to the suction port of the screw compressor. The liquid outlet of the second gas-liquid separator is connected to the inlet of a second evaporator. The gas outlet of the second evaporator is connected to the entrained fluid inlet of the second ejector.

[0006] The screw compression multi-temperature zone system with two-stage air injection by jet ejector of the present invention has two air injection ports axially opened along the cylinder of the screw compressor body. The ejector entrains the gas formed by the endothermic evaporation of the refrigerant liquid in the evaporator, and performs two-stage intermediate air injection, which can realize multi-temperature zone cooling and heating, effectively improve the thermodynamic performance of the system, and save energy consumption. Brief Description of the Drawings

[0007] Figure 1 The figure shows a schematic diagram of the screw compression multi-temperature zone system with two-stage air injection by jet ejector of the present invention. Detailed Embodiment

[0008] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0009] As Figure 1 shown, the screw compression multi-temperature zone system with jet ejector double air replenishment of the present invention includes:

[0010] A first ejector 1, a first evaporator 2, a condenser 3, a first gas-liquid separator 4, a first throttle valve 5, a second throttle valve 6, a second gas-liquid separator 7, a third throttle valve 8, a second evaporator 9, a third evaporator 10, a third ejector 11, a second ejector 12, and a screw compressor 13; the outlet of the screw compressor 13 is connected to the inlet of the condenser 3, and the outlet of the condenser 3 is divided into four paths. The first path is connected to the main fluid inlet of the first ejector 1, the second path is connected to the mixed fluid inlet of the first gas-liquid separator 4 through the first throttle valve 5, the third path is connected to the mixed fluid inlet of the second gas-liquid separator 7 through the second throttle valve 6, and the fourth path is connected to the inlet of the third evaporator 10 through the third throttle valve 8; the liquid outlet of the first gas-liquid separator 4 is connected to the liquid inlet of the first evaporator 2, the gas outlet of the first evaporator 2 is connected to the entrained fluid inlet of the first ejector 1, and the diffuser outlet of the first ejector 1 is connected to the second air replenishment port of the screw compressor 13 near the exhaust end; the gas outlet of the first gas-liquid separator 4 is connected to the main fluid inlet of the second ejector 12, and the diffuser outlet of the second ejector 12 is connected to the first air replenishment port of the screw compressor 13 near the suction end; the gas outlet of the second gas-liquid separator 7 is connected to the main fluid inlet of the third ejector 11, and the diffuser outlet of the third ejector 11 is connected to the suction port of the screw compressor 13; the liquid outlet of the second gas-liquid separator 7 is connected to the inlet of the second evaporator 9, and the gas outlet of the second evaporator 9 is connected to the entrained fluid inlet of the second ejector 12.

[0011] Among them, the first ejector 1, the second ejector 12, and the third ejector 11 are ejectors with the same structure or ejectors with different structures.

[0012] The first ejector 1, the second ejector 12, and the third ejector 11 may be single-entrained fluid inlet ejectors, each including a main fluid inlet, a diffuser outlet, and an entrained fluid inlet.

[0013] Furthermore, two air replenishment ports are axially opened on the cylinder of the screw compressor body, and the two air replenishment ports are separated by a predetermined distance and are located in the same axial direction.

[0014] During system operation, the high-temperature and high-pressure gas discharged from the screw compressor 13 enters the condenser 3. The liquid that releases heat through heat exchange with the cooling medium and condenses is divided into four paths. The first path enters the main fluid inlet of the first ejector 1, is ejected and expanded to reduce pressure in the first ejector 1, and then entrains the gas of the first evaporator 2. After mixing, it is compressed in the first ejector 1 and enters the body of the screw compressor 13 from the second air supplement port. The second path enters the first throttle valve 5 to reduce pressure and then enters the first gas-liquid separator 4. The separated liquid enters the first evaporator 2 to absorb the heat of the space to be cooled and provide a cold source. The gas separated by the first gas-liquid separator 4 enters the second ejector 12, is ejected and expanded to reduce pressure, and then entrains the gas of the second evaporator 9. After mixing, it is compressed in the second ejector 12 and enters the body of the screw compressor 13 from the first air supplement port. The third path enters the second throttle valve 6 to reduce pressure and then enters the second gas-liquid separator 7. The separated liquid enters the second evaporator 9 to absorb the heat of the space to be cooled and provide a cold source. The separated gas enters the third ejector 11, is ejected and expanded to reduce pressure, and then entrains the gas of the third evaporator 10. After mixing, it is compressed in the third ejector 11 and enters the screw compressor 13 from the suction port. The fourth path enters the third throttle valve 8 to reduce pressure and then enters the third evaporator 10 to absorb the heat of the space to be cooled and provide a cold source. The first evaporator 2, the second evaporator 9, and the third evaporator 10 of this system can achieve refrigeration at three temperatures, and the condenser 3 can supply heat.

[0015] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. A screw compression multi-temperature zone system with two-stage air injection and ejector air replenishment, characterized in that, it includes a screw compressor. The outlet of the screw compressor is connected to the inlet of the condenser. The outlet of the condenser is divided into four paths. The first path is connected to the main fluid inlet of the first ejector. The second path is connected to the mixed fluid inlet of the first gas-liquid separator through the first throttle valve. The third path is connected to the mixed fluid inlet of the second gas-liquid separator through the second throttle valve. The fourth path is connected to the inlet of the third evaporator through the third throttle valve. The liquid outlet of the first gas-liquid separator is connected to the liquid inlet of the first evaporator. The gas outlet of the first evaporator is connected to the entrained fluid inlet of the first ejector. The diffuser outlet of the first ejector is connected to the second air replenishment port of the screw compressor near the exhaust end. The gas outlet of the first gas-liquid separator is connected to the main fluid inlet of the second ejector. The diffuser outlet of the second ejector is connected to the first air replenishment port of the screw compressor near the suction end. The gas outlet of the second gas-liquid separator is connected to the main fluid inlet of the third ejector. The diffuser outlet of the third ejector is connected to the suction port of the screw compressor. The liquid outlet of the second gas-liquid separator is connected to the inlet of the second evaporator. The gas outlet of the second evaporator is connected to the entrained fluid inlet of the second ejector. The first ejector, the second ejector and the third ejector are single-entrained fluid inlet ejectors, and each includes a main fluid inlet, a diffuser outlet and an entrained fluid inlet.

2. The screw compression multi-temperature zone system with two-stage air injection and ejector air replenishment according to claim 1, characterized in that, two air replenishment ports are axially opened in the cylinder of the screw compressor body, and the two air replenishment ports are separated by a predetermined distance and are located in the same axial direction.

3. The screw compression multi-temperature zone system with two-stage air injection and ejector air replenishment according to claim 1, characterized in that, the first ejector, the second ejector and the third ejector are ejectors with the same structure or ejectors with different structures.

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