Interstage cooling structure of two-stage gas compressor

Abstract

The utility model relates to the technical field of gas compressors, in particular to an interstage cooling structure of a two-stage gas compressor. Comprising a two-stage gas compressor, a first-stage gas outlet and a second-stage gas inlet of the two-stage gas compressor are connected through an interstage connecting pipe, an interstage cooling pipe is arranged in the interstage connecting pipe, and a second-stage gas outlet of the two-stage gas compressor is connected with a gas inlet of a condenser through a pipeline. One branch of a liquid outlet of the condenser is connected with an inlet of the evaporator through a first expansion valve, a gas outlet of the evaporator is connected with a first-stage gas inlet of the two-stage gas compressor through a pipeline, and the other branch of the liquid outlet of the condenser is connected with an inlet of the interstage cooling pipe through a second expansion valve. And a gas outlet of the interstage cooling pipe is connected with a first-stage gas inlet of the two-stage gas compressor through a pipeline. And finally, the rotating speed can be increased, the gas displacement can be increased, and the refrigeration efficiency can be improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a gas compressor technical field especially relates to a two stage gas compressor's interstage cooling structure. BACKGROUND

[0002] At present, in two stage high speed centrifugal air compressor, all are through motor simultaneously drive two stage compression cavity to air pressure boost, and the two stage compression cavity is connected through the connecting pipe, and the gas that discharges from the first stage compression cavity enters the second stage compression cavity through the connecting pipe and carries out pressure boost again, forms high pressure gas, and this kind of compressor is often applied in air conditioning system. Air conditioning system has the requirement to the gas temperature of compressor, under the premise of guaranteeing the gas output, the second stage gas temperature generally requires highest than room temperature 10 DEG C or so, and the compressor speed is positively correlated with the gas temperature, if want high speed, the gas output is large, and the gas temperature is low, then need the low intake temperature, and the intake temperature involves the intake temperature of first stage compression cavity on one hand, and the intake temperature of second stage compression cavity on the other hand, and the intake temperature of second stage compression cavity is not easy to control at present, thereby leading to speed reduction, exhaust volume reduction, refrigeration efficiency reduction, and there is no good method to solve the above problems at present.

[0003] In conclusion, the above problems of two stage gas compressor in the use process have become the technical problems that the industry needs to solve urgently. UTILITY MODEL CONTENTS

[0004] The utility model provides a two stage gas compressor's interstage cooling structure to make up for the deficiency of prior art, solves the problem that the intake temperature of second stage compression cavity is not easy to control and leads to speed reduction, exhaust volume reduction and refrigeration efficiency reduction.

[0005] The utility model provides a two stage gas compressor's interstage cooling structure to make up for the deficiency of prior art, solves the problem that the intake temperature of second stage compression cavity is not easy to control and leads to speed reduction, exhaust volume reduction and refrigeration efficiency reduction.

[0006] A two stage gas compressor's interstage cooling structure, including two stage gas compressor, the first stage gas outlet of two stage gas compressor is connected with the second stage gas inlet through interstage connecting pipe, and the interstage connecting pipe is equipped with interstage cooling pipe, and the second stage gas outlet of two stage gas compressor is connected with the gas inlet of condenser through pipeline, and the liquid outlet of condenser is connected with the inlet of evaporator through first expansion valve, and the gas outlet of evaporator is connected with the first stage gas inlet of two stage gas compressor through pipeline, and the liquid outlet of condenser is connected with the inlet of interstage cooling pipe through second expansion valve, and the gas outlet of interstage cooling pipe is connected with the first stage gas inlet of two stage gas compressor through pipeline.

[0007] The condenser is used for cooling the high temperature gas discharged from the second stage gas outlet and making the gas into liquid.

[0008] The first expansion valve and the second expansion valve are used for atomizing the liquid discharged from the condenser.

[0009] The evaporator is used for gasifying the mist discharged from the first expansion valve and cooling the surrounding air to blow cold air.

[0010] The inter-stage cooling pipe is arranged inside the inter-stage connecting pipe and is used for gasifying the mist discharged from the second expansion valve and cooling the gas in the inter-stage connecting pipe.

[0011] The inter-stage cooling pipe is arranged inside the inter-stage connecting pipe and is used for gasifying the mist discharged from the second expansion valve and cooling the gas in the inter-stage connecting pipe.

[0012] The utility model discloses the above -mentioned scheme has the following advantages:

[0013] The inter-stage cooling pipe is arranged inside the inter-stage connecting pipe and is used for gasifying the mist discharged from the second expansion valve and cooling the gas in the inter-stage connecting pipe. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is the structural principle schematic diagram of the utility model.

[0015] In the drawing, 1, two-stage gas compressor, 2, first-stage air inlet, 3, first-stage air outlet, 4, second-stage air inlet, 5, second-stage air outlet, 6, inter-stage connecting pipe, 7, inter-stage cooling pipe, 8, condenser, 9, first expansion valve, 10, evaporator, 11, second expansion valve. DETAILED DESCRIPTION

[0016] In order to clearly illustrate the technical features of the present application, the utility model will be described in detail below with specific embodiments and in conjunction with the drawings.

[0017] As Figure 1As shown, an inter-stage cooling structure of a two-stage gas compressor, comprising a two-stage gas compressor 1, a first-stage outlet 3 of the two-stage gas compressor 1 is connected with a second-stage inlet 4 through an inter-stage connecting pipe 6, an inter-stage cooling pipe 7 is arranged in the inter-stage connecting pipe 6, a second-stage outlet 5 of the two-stage gas compressor 1 is connected with an inlet of a condenser 8 through a pipe, one branch of a liquid outlet of the condenser 8 is connected with an inlet of an evaporator 10 through a first expansion valve 9, an outlet of the evaporator 10 is connected with a first-stage inlet 2 of the two-stage gas compressor 1 through a pipe, another branch of the liquid outlet of the condenser 8 is connected with an inlet of the inter-stage cooling pipe 7 through a second expansion valve 11, and an outlet of the inter-stage cooling pipe 7 is connected with the first-stage inlet 2 of the two-stage gas compressor 1 through a pipe.

[0018] The condenser 8 is used for cooling the high-temperature gas discharged from the second-stage outlet 5 and making the gas into liquid.

[0019] The first expansion valve 9 and the second expansion valve 11 are used for atomizing the liquid discharged from the condenser 8 by adjusting the opening size.

[0020] The evaporator 10 is used for gasifying the atomized gas discharged from the first expansion valve 9, making the surrounding air cold and blowing cold air, and realizing the air conditioning refrigeration effect.

[0021] The inter-stage cooling pipe 7 exchanges heat in the inter-stage connecting pipe 6, the atomized gas discharged from the second expansion valve 11 in the inter-stage cooling pipe 7 is gasified, and the surrounding air is made cold to cool the gas in the inter-stage connecting pipe 6.

[0022] The inter-stage cooling pipe 7 is arranged in the inter-stage connecting pipe 6 in a shape of a loop, a coil or a labyrinth, so as to improve the heat exchange effect and make the heat exchange more sufficient.

[0023] Working principle:

[0024] When the two-stage gas compressor 1 is working, the high-pressure gas discharged from the second-stage gas outlet 5 has a temperature of about 42℃, and after the gas enters the condenser 8, the high-temperature gas is cooled to make the gas become liquid, and the liquid discharged from the liquid outlet of the condenser 8 has a temperature of about 30℃, and the liquid is partly atomized by the first expansion valve 9 and then enters the evaporator 10, the evaporator 10 gasifies the atomized gas and makes the surrounding air cold to blow cold air to realize the air conditioning refrigeration effect, the gas discharged from the evaporator 10 has a temperature of about 35℃, and the gas enters the first-stage gas inlet 2 of the two-stage gas compressor 1 again; the liquid discharged from the liquid outlet of the condenser 8 is partly atomized by the second expansion valve 11 and then enters the inter-stage cooling pipe 7, and the gas in the inter-stage connecting pipe 6 is cooled by heat exchange to make the surrounding air cold to cool the gas in the inter-stage connecting pipe 6, so that the temperature of the gas entering the second-stage gas inlet 4 is about 37℃, the temperature of the gas discharged from the inter-stage cooling pipe 7 is about 35℃, and the gas enters the first-stage gas inlet 2 of the two-stage gas compressor 1 again; after the gas is compressed in the first-stage compression cavity of the two-stage gas compressor 1, the temperature of the gas is increased to about 40℃, and then the gas is discharged from the first-stage gas outlet 3 to the inter-stage connecting pipe 6, cooled to about 37℃ by the inter-stage cooling pipe 7 and then enters the second-stage gas inlet 4, and after the gas is compressed in the second-stage compression cavity, the high-pressure gas discharged from the second-stage gas outlet 5 has a temperature of about 42℃, so that the closed loop circulation of the two-stage gas compressor inter-stage cooling system is formed.

[0025] The above specific embodiment cannot be regarded as a limitation on the protection scope of the utility model, and any alternative improvement or change made by the person skilled in the art to the embodiment of the utility model falls within the protection scope of the utility model.

[0026] The not detailed parts of the utility model are the known technology of the person skilled in the art.

Claims

1. An interstage cooling structure for a two-stage gas compressor, characterized in that: The system includes a two-stage gas compressor. The first-stage outlet and the second-stage inlet of the two-stage gas compressor are connected by an interstage connecting pipe. An interstage cooling pipe is installed inside the interstage connecting pipe. The second-stage outlet of the two-stage gas compressor is connected to the inlet of the condenser through a pipeline. One branch of the liquid outlet of the condenser is connected to the inlet of the evaporator through a first expansion valve. The outlet of the evaporator is connected to the first-stage inlet of the two-stage gas compressor through a pipeline. The other branch of the liquid outlet of the condenser is connected to the inlet of the interstage cooling pipe through a second expansion valve. The outlet of the interstage cooling pipe is connected to the first-stage inlet of the two-stage gas compressor through a pipeline.

2. The interstage cooling structure of a two-stage gas compressor according to claim 1, characterized in that: The condenser is used to cool the high-temperature gas discharged from the secondary outlet and turn the gas into a liquid.

3. The interstage cooling structure of a two-stage gas compressor according to claim 2, characterized in that: The first expansion valve and the second expansion valve are used to atomize the liquid discharged from the condenser.

4. The interstage cooling structure of a two-stage gas compressor according to claim 3, characterized in that: The evaporator is used to vaporize the mist discharged from the first expansion valve and cool the surrounding air to blow out cold air.

5. The interstage cooling structure of a two-stage gas compressor according to claim 3, characterized in that: The interstage cooling pipe exchanges heat within the interstage connecting pipe. The mist discharged from the second expansion valve within the interstage cooling pipe is vaporized, and the surrounding air is cooled, thus reducing the temperature of the gas within the interstage connecting pipe.

6. The interstage cooling structure of a two-stage gas compressor according to claim 1, characterized in that: The interstage cooling pipes are arranged in a U-shape, coil shape, or labyrinth shape inside the interstage connecting pipes.

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