A low-temperature flooded evaporator and its usage method

Abstract

The present invention relates to the field of evaporators, and particularly to a low-temperature flooded evaporator. In the prior art, there is a problem that the lubricating oil of the compressor of the flooded evaporator is difficult to flow at low temperatures. The present invention includes an evaporation housing, an external connection of the evaporation housing is provided with a compressor, a refrigerant is provided inside the evaporation housing, and a microchannel heat-carrying layer is provided on top of the refrigerant. The structure of the present invention is reasonable and simple, and the operation is convenient. The microchannel heat-carrying layer can heat the lubricating oil condensed and floating on the surface layer of the refrigerant liquid level, ensuring the fluidity of the lubricating oil, so that the heated lubricating oil can flow back into the compressor together with the gaseous refrigerant, thereby improving the working stability of the compressor.

Description

Technical Field

[0001] The present invention relates to the field of evaporators, and in particular to a low-temperature flooded evaporator and a use method thereof. Background Art

[0002] An evaporator is a device that converts liquid substances into gaseous substances. It is a crucial component in the four major components of refrigeration. Low-temperature liquid refrigerant passes through the evaporator, exchanging heat with the medium to be cooled, absorbing heat and converting it into gaseous form, achieving the cooling effect.

[0003] Among them, flooded evaporators are widely used. However, during use, the lubricating oil in the compressor will mix with the refrigerant and flow into the evaporator with the refrigerant. Due to the low temperature, the viscosity of the lubricating oil will increase and even solidify and float on the surface of the refrigerant, thereby affecting the safe operation of the system.

[0004] The above problems are issues that need to be urgently solved in this field. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a low-temperature flooded evaporator, thereby preventing the solidification and accumulation of lubricating oil and greatly improving the operating stability of the equipment.

[0006] In order to solve the above technical problems, the present invention provides a solution: a low-temperature flooded evaporator, including an evaporation shell, a compressor is connected to the outside of the evaporation shell, a refrigerant is arranged inside the evaporation shell, and a microchannel heat carrier layer is arranged on the top of the refrigerant. The present invention has a reasonable and simple structure and is easy to operate. The microchannel heat carrier layer can heat the lubricating oil floating on the surface of the refrigerant, ensuring the fluidity of the lubricating oil, and the lubricating oil is sucked into the compressor along with the gaseous refrigerant, thereby ensuring the stability of the compressor operation.

[0007] As a further improvement of the present invention, capillaries are provided inside the microchannel heat carrier layer, and the capillaries are distributed in a microchannel manner so that the microchannel heat carrier layer is heated evenly. An inlet connected to the capillaries is provided on the side of the microchannel heat carrier layer, and an outlet connected to the capillaries is provided on the side of the microchannel heat carrier layer, which can facilitate the discharge of liquid inside the microchannel heat carrier layer.

[0008] As a further improvement of the present invention, fins are provided on the outer wall of the capillary tube inside the microchannel heat carrier layer, which can improve the heat absorption efficiency of the microchannel heat carrier layer.

[0009] As a further improvement of the present invention, a plurality of outlets communicating with the capillaries are spaced apart on the side surface of the microchannel heat carrier layer, so that liquid at various locations inside the microchannel heat carrier layer can flow to the outside.

[0010] As a further improvement of the present invention, ejectors are connected to one end of each of the outlets, which can facilitate the outflow of the liquid in the microchannel heat-carrying layer.

[0011] As a further improvement of the present invention, the distance between the microchannel heat-carrying layer and the refrigerant liquid level is 0.5 mm - 2 mm, so as to better heat the surface lubricating oil without immersion.

[0012] As a further improvement of the present invention, the microchannel heat-carrying layer is made of steel material, which can ensure its strength and service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 is the front view of the present invention;

[0014] Figure 2 is the top view of the present invention.

[0015] Reference numerals: 1, evaporation housing; 2, refrigerant; 3, microchannel heat-carrying layer; 301, capillary tube; 302, fin; 303, inlet; 304, outlet; 4, ejector; 5, compressor. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0016] The present invention will be further described below in conjunction with the drawings and specific embodiments, so that those skilled in the art can better understand the present invention and be able to implement it, but the embodiments cited are not intended to limit the present invention.

[0017] Refer to Figure 1 As shown, an embodiment of the present invention includes an evaporation housing 1, a compressor 5 is connected to the outside of the evaporation housing 1, a refrigerant 2 is provided inside the evaporation housing 1. In order to solve the lubricating oil floating on the surface of the refrigerant 2 and solidifying, a microchannel heat-carrying layer 3 made of steel material is provided on the top of the refrigerant 2. At the same time, a capillary tube 301 is provided inside the microchannel heat-carrying layer 3. An inlet 303 communicating with the capillary tube 301 is provided on the side of the microchannel heat-carrying layer 3, and an outlet 304 communicating with the capillary tube 301 is provided on the side of the microchannel heat-carrying layer 3. The inlet 303 is connected to an external hot gas source to heat the microchannel heat-carrying layer 3. Through the heating of the microchannel heat-carrying layer 3, the lubricating oil floating on the surface of the refrigerant 2 can be dissolved, and the dissolved lubricating oil is brought back into the compressor 5 by the boiling refrigerant 2. In order to make the heating more uniform, the capillary tubes 301 are distributed according to the microchannels. At the same time, the hot gas is cooled to form a liquid, which can be discharged from the outlet 304.

[0018] During actual use, in order to further accelerate the heating efficiency of the microchannel heat-carrying layer 3, fins 302 are provided on the outer wall of the capillary 301 inside the microchannel heat-carrying layer 3. The heat absorption of the fins 302 can improve the heating efficiency. Since the hot gas will quickly liquefy when entering the microchannel heat-carrying layer 3, a plurality of outlets 304 are provided at intervals on the side of the microchannel heat-carrying layer 3, which can facilitate the liquid to flow out of the microchannel heat-carrying layer 3. At the same time, in order to facilitate the liquid to flow out of the microchannel heat-carrying layer 3, an ejector 4 is connected to the outlet 304, which can facilitate the liquid to flow out of the microchannel heat-carrying layer 3.

[0019] According to the actual situation, the microchannel heat-carrying layer 3 is not in immersion contact with the refrigerant 2. At the same time, in order to better heat the lubricating oil on the surface of the refrigerant 2, the distance between the microchannel heat-carrying layer 3 and the liquid level of the refrigerant 2 is controlled between 0.5 mm and 2 mm, so as to better heat and dissolve the solidified lubricating oil without immersion.

[0020] The above-mentioned embodiments are only preferred embodiments cited to fully illustrate the present invention, and the protection scope of the present invention is not limited thereto. Equivalent substitutions or transformations made by those skilled in the art on the basis of the present invention are within the protection scope of the present invention. The protection scope of the present invention is subject to the claims.

Claims

1. A low-temperature flooded evaporator, characterized in that: It comprises an evaporation shell (1), the evaporation shell (1) is externally connected to a compressor (5), a refrigerant (2) is arranged inside the evaporation shell (1), and a microchannel heat carrier layer (3) is arranged on top of the refrigerant (2); Capillaries (301) are provided inside the microchannel heat-carrying layer (3), and the capillaries (301) are distributed in a microchannel manner. An inlet (303) communicating with the capillaries (301) is provided on the side of the microchannel heat-carrying layer (3), and an outlet (304) communicating with the capillaries (301) is provided on the side of the microchannel heat-carrying layer (3); Fins (302) are provided on the outer wall of the capillary tube (301) inside the microchannel heat carrier layer (3); The side of the microchannel heat carrier layer (3) is provided with a plurality of outlets (304) connected to the capillary tube (301) at intervals; One end of the outlet (304) is connected to an ejector (4); The distance between the microchannel heat carrier layer (3) and the liquid surface of the refrigerant (2) is 0.5 mm to 2 mm.

2. A low-temperature flooded evaporator according to claim 1, characterized in that: The microchannel heat carrier layer (3) is made of steel.

3. The method for using a low-temperature flooded evaporator according to any one of claims 1 to 2, characterized in that: The following steps are involved: Step 1: Connect the hot air source to the inlet (303), and fill the capillary (301) with hot air to heat the microchannel heat carrier layer (3); Step 2: The microchannel heat carrier layer (3) heats and dissolves the lubricating oil floating on the surface of the refrigerant (2), and the dissolved lubricating oil is brought back to the compressor (5) through the boiling refrigerant (2); Step 3: The hot gas in the capillary tube (301) is cooled to form liquid and discharged from the outlet (304).

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