A low-temperature air-supplementing enthalpy-increasing compression system

Abstract

The present invention discloses a low-temperature air-injection and regenerative compression system, comprising a liquid reservoir, wherein a liquid reservoir outlet and a liquid reservoir inlet are fixedly provided on both sides of the upper end of the liquid reservoir, an auxiliary valve front liquid inlet, an auxiliary expansion valve, and an auxiliary valve rear air outlet are fixedly provided inside the liquid reservoir, and a heat exchanger is provided at the bottom of the liquid reservoir. Compared with the prior art, the present invention has the advantages of reducing the number of peripheral components of the compressor operating system and the number of welding points, eliminating the need for independent insulation of the economizer, and ensuring that when the low-temperature air-injection and regenerative compression compressor is in operation, gas refrigerant enters the auxiliary circuit, while the main circuit refrigerant is effectively supercooled.

Description

Technical Field

[0001] The present invention relates to the technical field of low-temperature air-supplementing and enthalpy-increasing compressor equipment, and in particular to a low-temperature air-supplementing and enthalpy-increasing compression system. Background Art

[0002] The current low-temperature air-injection and reheat-increasing compressor unit features two main and auxiliary refrigerant inlets, with heat exchange between the main and auxiliary refrigerants via an economizer. The air-injection and reheat-increasing liquid inlet introduces liquid refrigerant from the main economizer inlet or outlet. Through throttling and pressure reduction, it absorbs heat and vaporizes on the economizer's auxiliary side, ensuring that only gaseous refrigerant enters the compressor. Simultaneously, the main refrigerant's liquid temperature is lowered by heat absorption in the auxiliary side, increasing the refrigerant's subcooling. This is beneficial for both cooling and heating operations. However, this involves the addition of an economizer, which increases costs. The economizer also requires independent insulation and installation of peripheral components for compressor operation, increasing costs and installation steps, as well as increasing joint welds and leaks. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to overcome the above technical defects and provide a low-temperature air-supply enthalpy-increasing compression system that can reduce the peripheral components of the compressor of the unit system and effectively protect the normal and efficient operation of the compressor.

[0004] In order to solve the above technical problems, the technical solution provided by the present invention is: a low-temperature air-injection enthalpy-increasing compression system, comprising a liquid reservoir, wherein a liquid reservoir outlet and a liquid reservoir inlet are fixedly provided on both sides of the upper end of the liquid reservoir, and an auxiliary valve front liquid inlet, an auxiliary expansion valve and an auxiliary valve rear air outlet are fixedly provided inside the liquid reservoir and are located between the liquid reservoir outlet and the liquid reservoir inlet, and a heat exchanger is provided at the bottom of the liquid reservoir.

[0005] The advantages of the present invention compared with the prior art are: a low-temperature air-injection enthalpy-increasing compression system, including a liquid reservoir, a liquid reservoir outlet and a liquid reservoir inlet are fixedly provided on both sides of the upper end of the liquid reservoir, an auxiliary valve front liquid inlet, an auxiliary expansion valve and an auxiliary valve rear air outlet are fixedly provided inside the liquid reservoir and are located between the liquid reservoir outlet and the liquid reservoir inlet, and a heat exchanger is provided at the bottom of the liquid reservoir.

[0006] As an improvement, the heat exchanger is configured as a shell and tube heat exchanger located at the bottom of the inner cavity of the liquid reservoir, and the liquid inlet of the shell and tube heat exchanger is close to a side wall of the bottom of the inner cavity of the liquid reservoir.

[0007] As an improvement, the outlet of the shell and tube heat exchanger is divided into two paths, one path serves as the main flow channel and continues to flow to the next path, and the other path is the auxiliary path and returns to the outer flow channel of the shell and tube heat exchanger after being reduced in pressure by the auxiliary expansion valve.

[0008] As an improvement, refrigerant is provided in the heat exchanger, and when the refrigerant evaporates, heat is exchanged with the refrigerant in the liquid storage device.

[0009] The advantages of the present invention are that: the peripheral components of the compressor operating system can be reduced, the welding points are reduced, and the economizer does not need to be independently insulated. It can also ensure that when the low-temperature gas-supplementing and heat-increasing compressor is in operation, the auxiliary circuit enters with gas refrigerant, and the main circuit refrigerant is effectively supercooled. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a structural schematic diagram of embodiment 1 of a low-temperature air-supplementing enthalpy-increasing compression system of the present invention.

[0011] Figure 2 It is a structural schematic diagram of a second embodiment of a low-temperature air-supplementing enthalpy-increasing compression system of the present invention.

[0012] As shown in the figure: 1. Liquid reservoir, 2. Liquid reservoir outlet, 3. Liquid reservoir inlet, 4. Liquid inlet before auxiliary valve, 5. Auxiliary expansion valve, 6. Air outlet after auxiliary valve, 7. Heat exchanger, 8. Shell and tube heat exchanger. DETAILED DESCRIPTION

[0013] The present invention will be described in further detail below with reference to the accompanying drawings.

[0014] When implemented, the present invention provides a low-temperature air-injection enthalpy-increasing compression system, including a liquid reservoir 1, wherein a liquid reservoir outlet 2 and a liquid reservoir inlet 3 are fixedly provided on both sides of the upper end of the liquid reservoir 1, and an auxiliary valve front liquid inlet 4, an auxiliary expansion valve 5 and an auxiliary valve rear air outlet 6 located between the liquid reservoir outlet 2 and the liquid reservoir inlet 3 are fixedly provided inside the liquid reservoir 1, and a heat exchanger 7 is provided at the bottom inside the liquid reservoir 1.

[0015] The heat exchanger 7 is configured as a shell and tube heat exchanger 8 located at the bottom of the inner cavity of the liquid reservoir 1 , and the liquid inlet of the shell and tube heat exchanger 8 is close to a side wall of the bottom of the inner cavity of the liquid reservoir 1 .

[0016] The outlet of the double-tube heat exchanger 8 is divided into two paths, one path serves as the main flow channel and continues to flow to the next path, and the other path serves as the auxiliary flow channel and returns to the outer flow channel of the double-tube heat exchanger 8 after being reduced in pressure by the auxiliary expansion valve 5.

[0017] The heat exchanger 7 contains refrigerant, and when the refrigerant evaporates, the refrigerant exchanges heat with the refrigerant in the accumulator 1 .

[0018] Example 1:

[0019] The auxiliary heat exchange copper tube is directly placed at the bottom of the liquid reservoir cavity as a heat exchanger 7. In this way, the refrigerant in the auxiliary circuit can absorb the heat of the refrigerant in the liquid reservoir 1 when evaporating in the tube, which not only ensures the vaporization of the auxiliary circuit refrigerant but also cools the main circuit refrigerant to form supercooling.

[0020] Example 2:

[0021] The shell and tube heat exchanger 8 is placed at the bottom of the inner cavity of the liquid reservoir 1. The liquid inlet of the shell and tube heat exchanger 8 is directly sucked in at the bottom of the liquid reservoir 1 and flows in the inner flow channel of the shell and tube heat exchanger 8. At its outlet, it is divided into two paths: one path serves as the main flow channel and continues to flow to the next path, and the other path is the auxiliary path. After the pressure is reduced by the auxiliary expansion valve 5, it returns to the outer flow channel of the shell and tube heat exchanger 8 and evaporates in the shell and tube heat exchanger 8, which not only ensures the vaporization of the auxiliary refrigerant but also cools the main refrigerant to form supercooling.

[0022] The present invention and its embodiments are described above. This description is not restrictive. The drawings show only one embodiment of the present invention, and the actual structure is not limited thereto. In short, if a person skilled in the art is inspired by this and, without departing from the purpose of the present invention, designs structures and embodiments similar to this technical solution without inventiveness, they shall fall within the scope of protection of the present invention.

Claims

1. A low-temperature air-injection enthalpy-increasing compression system, comprising a liquid reservoir (1), characterized in that: A liquid reservoir outlet (2) and a liquid reservoir inlet (3) are fixedly provided on both sides of the upper end of the liquid reservoir (1); an auxiliary valve front liquid inlet (4), an auxiliary expansion valve (5) and an auxiliary valve rear air outlet (6) located between the liquid reservoir outlet (2) and the liquid reservoir inlet (3) are fixedly provided inside the liquid reservoir (1); and a heat exchanger (7) is provided at the bottom inside the liquid reservoir (1). The heat exchanger (7) is configured as a shell and tube heat exchanger (8) located at the bottom of the inner cavity of the liquid reservoir (1), and the liquid inlet of the shell and tube heat exchanger (8) is close to a side wall of the bottom of the inner cavity of the liquid reservoir (1). The outlet of the shell and tube heat exchanger (8) is divided into two paths, one path serves as the main flow channel and continues to flow to the next path, and the other path serves as the auxiliary flow channel and returns to the outer flow channel of the shell and tube heat exchanger (8) after being reduced in pressure by the auxiliary expansion valve (5). The heat exchanger (7) is provided with a refrigerant, and when the refrigerant evaporates, heat is exchanged with the refrigerant in the liquid storage container (1).

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