WO2022121950A1

WO2022121950A1 - Low-temperature flooded evaporator and using method

Info

Publication number: WO2022121950A1
Application number: PCT/CN2021/136497
Authority: WO
Inventors: 郭江虹; 俞宏
Original assignee: 爱法科技(无锡)有限公司
Priority date: 2020-12-11
Filing date: 2021-12-08
Publication date: 2022-06-16
Also published as: CN112432391A

Abstract

The present invention relates to the field of evaporators, and specifically, to a low-temperature flooded evaporator. There is a problem in the prior art that flooded evaporator compressor lubricating oil is difficult to flow at low temperature. The present invention comprises an evaporation housing; a compressor is connected to the outside of the evaporation housing; a refrigerant is provided inside the evaporation housing; a micro-channel heat carrying layer is provided at the top of the refrigerant. The present invention has a reasonable and simple structure and is convenient to operate, lubricating oil condensed and floating on the surface layer of a refrigerant liquid surface can be heated by means of the micro-channel heat carrying layer, so as to ensure the fluidity of the lubricating oil, so that the heated lubricating oil can flow back to the inside of the compressor along with the gaseous refrigerant, thereby improving the working stability of the compressor.

Description

A low temperature flooded evaporator and using method

technical field

The invention relates to the field of evaporators, in particular to a low-temperature flooded evaporator and a use method.

Background technique

An evaporator is a device that converts a liquid substance into a gaseous state. The evaporator is a very important part of the four major components of refrigeration. The low-temperature liquid refrigerant passes through the evaporator and exchanges heat with the medium that needs to be cooled, absorbs heat and converts it into a gaseous state to achieve the effect of refrigeration.

Among them, flooded evaporators are widely used, but during use, the lubricating oil in the compressor will be mixed with the refrigerant and flow into the evaporator with the refrigerant. Due to the low temperature, the viscosity of the lubricating oil will increase or even increase The solidification floats on the surface of the refrigerant, thereby affecting the safe operation of the system. Type the Background Description paragraph here. The above problem is an urgent problem to be solved in the art.

technical problem

The technical problem to be solved by the present invention is to provide a low-temperature flooded evaporator, which can avoid the solidification and accumulation of lubricating oil and greatly improve the operation stability of the equipment.

technical solutions

In order to solve the above technical problems, the solution provided by the present invention is: a low-temperature flooded evaporator, comprising an evaporating shell, a compressor is connected to the outside of the evaporating shell, and a refrigerant is arranged inside the evaporating shell, so The top of the refrigerant is provided with a micro-channel heat-carrying layer. The invention has a reasonable and simple structure and convenient operation. The micro-channel heat-carrying layer can heat the lubricating oil floating on the surface of the refrigerant, so as to ensure the fluidity of the lubricating oil, and it can change with the gaseous state. The refrigerant is sucked into the compressor to ensure the stability of the compressor operation.

As a further improvement of the present invention, capillaries are arranged inside the micro-channel heat-carrying layer, and the capillaries are distributed in micro-channels, so that the micro-channel heat-carrying layer is heated evenly, and the side of the micro-channel heat-carrying layer is provided with connecting The inlet of the capillary tube and the side surface of the microchannel heat-carrying layer are provided with an outlet that communicates with the capillary tube, which can facilitate the discharge of the liquid inside the microchannel heat-carrying layer.

As a further improvement of the present invention, fins are provided on the outer wall of the capillary tube inside the microchannel heat-carrying layer, which can improve the heat-absorbing efficiency of the micro-channel heat-carrying layer.

As a further improvement of the present invention, the side surface of the microchannel heat carrier layer is provided with several outlets communicating with the capillary tubes at intervals, so that the liquid from all places inside the microchannel heat carrier layer can flow to the outside.

As a further improvement of the present invention, one end of the outlet is connected with an ejector, which can facilitate the outflow of the liquid in the heat-carrying layer of the microchannel.

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

As a further improvement of the present invention, the microchannel heat-carrying layer is made of steel, which can ensure its strength and service life.

beneficial effect

The invention has reasonable and simple structure and convenient operation. The micro-channel heat-carrying layer can heat the lubricating oil floating on the surface of the refrigerant to ensure the fluidity of the lubricating oil, and is sucked into the compressor with the gaseous refrigerant, thereby ensuring the working of the compressor. stability.

Description of drawings

Fig. 1 is the front view of the present invention;

Figure 2 is a plan view of the present invention.

Reference numerals: 1. Evaporation shell; 2. Refrigerant; 3. Microchannel heat transfer layer; 301, Capillary tube; 302, Fin; 303, Inlet; 304, Outlet; 4, Ejector; .

Detailed ways

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

Referring to FIG. 1 , an embodiment of the present invention includes an evaporating casing 1, a compressor 5 is connected to the outside of the evaporating casing 1, and a refrigerant 2 is arranged inside the evaporating casing 1, in order to solve the problem of floating on the surface of the refrigerant 2 and solidifying Therefore, a micro-channel heat-carrying layer 3 made of steel is arranged on the top of the refrigerant 2, and a capillary 301 is arranged inside the micro-channel heat-carrying layer 3, and a communicating capillary 301 is arranged on the side of the micro-channel heat-carrying layer 3. The inlet 303 of the microchannel heat-carrying layer 3 is provided with an outlet 304 communicating with the capillary 301 on the side, and the inlet 303 is connected with an external hot gas source, thereby heating the micro-channel heat-carrying layer 3, through the heating of the micro-channel heat-carrying layer 3, It can dissolve the solidified 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. In order to make the heating more uniform, the capillary 301 is distributed according to the micro-channel, and the hot gas passes through Cooling forms a liquid that can be discharged from outlet 304 .

In the actual use process, in order to further accelerate the heating efficiency of the microchannel heat-carrying layer 3, fins 302 are arranged on the outer wall of the capillary 301 inside the micro-channel heat-carrying layer 3, and the heat absorption of the fins 302 can improve the heating efficiency. Efficiency; since the hot gas enters the microchannel heat-carrying layer 3 and liquefies rapidly, a plurality of outlets 304 are arranged at intervals on the side of the micro-channel heat-carrying layer 3, so that the liquid can easily flow out of the micro-channel heat-carrying layer 3; at the same time, in order to facilitate the liquid The ejector 4 is connected to the outlet 304 to facilitate the liquid flowing out of the microchannel heat-carrying layer 3 .

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

The above-mentioned embodiments are only preferred embodiments for fully illustrating 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 all within the protection scope of the present invention. The protection scope of the present invention is subject to the claims.

Claims

A low-temperature flooded evaporator, characterized in that it comprises an evaporation shell (1), a compressor (5) is connected to the outside of the evaporation shell (1), and a refrigeration system is arranged inside the evaporation shell (1). The refrigerant (2) is provided with a micro-channel heat-carrying layer (3) on the top of the refrigerant (2).
The low-temperature flooded evaporator according to claim 1, characterized in that a capillary tube (301) is arranged inside the microchannel heat-carrying layer (3), and the capillary tube (301) is distributed in a microchannel, so An inlet (303) communicating with the capillary (301) is provided on the side of the micro-channel heat-carrying layer (3), and an outlet (304) communicating with the capillary (301) is provided on the side of the micro-channel heat-carrying layer (3). .
The low-temperature flooded evaporator according to claim 2, characterized in that fins (302) are provided on the outer wall of the capillary tube (301) inside the microchannel heat-carrying layer (3).
The low-temperature flooded evaporator according to claim 2, characterized in that, several outlets (304) communicating with the capillary (301) are provided at intervals on the side surface of the microchannel heat-carrying layer (3).
The low-temperature flooded evaporator according to claim 2, characterized in that, one end of the outlet (304) is connected with an ejector (4).
The low-temperature flooded evaporator according to claim 1, characterized in that, the distance between the microchannel heat transfer layer (3) and the liquid surface of the refrigerant (2) is 0.5mm-2mm.
The low-temperature flooded evaporator according to claim 1, characterized in that, the micro-channel heat-carrying layer (3) is made of steel.
A method of using a low-temperature flooded evaporator, comprising the following steps:

Step 1: connect the hot gas source to the inlet (303), and fill the capillary tube (301) with the hot gas to heat the microchannel heat-carrying layer (3);

Step 2: The microchannel heat-carrying 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 (301) is cooled to form a liquid, which is discharged from the outlet (304).