WO2022099609A1

WO2022099609A1 - Air conditioning unit having oil return device

Info

Publication number: WO2022099609A1
Application number: PCT/CN2020/128667
Authority: WO
Inventors: 张华�
Original assignee: 常兴集团有限公司
Priority date: 2020-11-13
Filing date: 2020-11-13
Publication date: 2022-05-19
Also published as: CN114930098A

Abstract

An air conditioning unit having an oil return device. the oil return device comprises an oil return pipe (1), a counterweight block (2), an oil collection housing (3), and a float (4); an opening I (31) and an opening II (32) are formed on the oil collection housing (3); after entering along the opening II (32), a lubricating oil flows downward along a guide plate (33) to extrude out a portion of a liquid which enters along the opening I (31), such that the lubricating oil is located in the upper portion of the oil collection housing (3), and a small amount of liquid is converged in the lower portion of the oil collection housing (3); the lubricating oil is continuously injected into the oil collection housing (3) until a small amount of liquid is extruded out of the oil collection housing (3) along the opening I (31), so that the oil collection housing (3) merely retains the lubricating oil, thereby avoiding oil return nonsmoothness and oil return incapability caused by the fact that the liquid in the lower portion turns upwards when the oil return device fluctuates or inclines lower liquid is turned upwards; in addition, by pressing the oil return pipe (1) downwards by means of the counterweight block (2), a pipe I (11) and a pipe II (12) of the oil return pipe (1) can be accurately retracted when in an extended state, thus avoiding the occurrence of sticking caused by friction.

Description

An air-conditioning unit with an oil return device

technical field

The invention relates to the technical field of air conditioners, in particular to an air conditioner unit of an oil return device.

Background technique

The oil return device is widely used in air conditioning, refrigeration and other industries. The oil return device is an important part of the air conditioning unit. The function of the oil return device affects the working efficiency of the air conditioner and refrigeration. However, the oil return port of some oil return devices is in a fixed state and cannot follow the change of the liquid level. Due to the dislocation, the oil cannot be returned, and the compressor has a hidden danger of running without oil.

In order to solve the above problems, the existing technology sets an active oil return port that can follow the change of the liquid level, but there are still shortcomings: 1. The active oil return port can only follow the change of the liquid level height in the vertical direction to a limited extent. When the liquid level fluctuates Or when it is tilted, the liquid below is easy to surge upward, and it is difficult to ensure that the oil return port continues to absorb lubricating oil, resulting in poor oil return or even failure to return oil; 2. The float slides along the guide rod, and there is friction to cause it to become stuck.

SUMMARY OF THE INVENTION

Therefore, the present invention is made in view of the above problems, and the purpose of the present invention is to provide an air-conditioning unit with an oil return device. The present invention concentrates the lubricating oil and then extracts the concentrated lubricating oil to ensure the extraction Accuracy of lubricating oil, avoid empty pumping or false pumping.

An air conditioning unit of an oil return device comprises an oil return pipe and a low-pressure circulating liquid storage tank, wherein the oil return pipe is arranged at the bottom of the low-pressure circulating liquid storage tank; the lower end of the oil return pipe is fixedly connected with the bottom of the low-pressure circulating liquid storage tank; The oil pipe includes a pipe 1, the lower end of the pipe is fixedly connected with the bottom of the low-pressure circulating liquid storage tank; the top of the pipe 1 is slidably connected with a pipe 2, and the top of the pipe 2 is slidably connected with a pipe 3; the top of the pipe 3 is provided with There is a throttle valve, a weight is set at the lower end of the third pipe, the bottom of the weight is fixedly connected with the top of the second pipe; the top of the weight is fixedly connected with an oil collecting shell; the top of the oil collecting shell is fixedly connected with a float The upper and lower sides of the outer surface of the oil collecting shell are sequentially provided with an opening two and an opening one; a guide plate is fixedly connected to the upper side of the oil collecting shell close to the opening two.

An air-conditioning unit adopts the above-mentioned oil return device, and the first pipe of the oil return device is communicated with the oil outlet of the low-pressure circulating liquid storage tank.

Beneficial effects:

1. In the present invention, the lubricating oil entering along the second opening flows down the guide plate, and the liquid that enters along the first opening is extruded. The lubricating oil is located under the oil collecting shell, and a small amount of liquid gathers under the oil collecting shell, and the lubricating oil continuously flows to the Inject into the oil collecting shell until a small amount of liquid is squeezed out of the oil collecting shell along the opening, so that only the lubricating oil is retained in the oil collecting shell, so as to avoid the liquid below easily surging upward due to fluctuations or inclinations, resulting in poor oil return or even failure. return oil;

2. In the present invention, the heavy block is pressed down to return the oil pipe, so that the first and second pipes can be recovered accurately in a stretched state, so as to avoid friction and jamming.

3. The air-conditioning unit of the present invention has smooth oil return and stable operation due to the adoption of the above-mentioned oil return device.

Description of drawings

FIG. 1 is a schematic diagram of the overall structure of the present invention.

Figure 2 is a schematic diagram of the internal structure of the present invention.

3 is a schematic diagram of the lubricating oil convergence of the present invention.

FIG. 4 is a schematic diagram of the float of the oil return device of the present invention.

As shown in 1-4 in the picture: 1- oil return pipe, 2- heavy block, 3- oil collecting shell, 4- float, 11- pipe one, 12- pipe two, 13- pipe three, 31- opening one, 32 - Opening two, 33-guide plate, 111-sealing ring, 121-fitting part, 5-low pressure circulating liquid storage tank.

Detailed ways

The present invention will be further described below with reference to specific embodiments and accompanying drawings. More details are set forth in the following description to facilitate a full understanding of the present invention, but it is obvious that the present invention can be implemented in many other ways that are different from those described herein. Those skilled in the art can make similar promotions and deductions according to the actual application situation without violating the connotation of the present invention. Therefore, the content of the specific embodiments should not limit the protection scope of the present invention.

As shown in Figure 1, an oil return device includes: an oil return pipe 1, a weight 2, an oil collecting shell 3, and a float 4;

As shown in FIG. 2 , the oil return pipe 1 is composed of pipe one 11 , pipe two 12 and pipe three 13 ;

The pipe one 11 is vertically arranged in the low pressure circulating liquid storage tank 5, the lower end of the pipe one 11 is connected to the low pressure circulating liquid storage tank 5, and a sealing ring 111 is installed inside the upper end of the pipe one 11;

The diameter of the second tube 12 is the same as the inner diameter of the sealing ring 111. The lower end of the second tube 12 penetrates the sealing ring 111 and extends into the interior of the first tube 11. The second tube 12 communicates with the first tube 11, and the lower end of the second tube 12 is provided with a fitting part 121;

The fitting portion 121 is annular, and the outer wall of the fitting portion 121 is fitted with the inner wall of the tube one 11, so that the tube two 12 can move vertically up and down along the tube one 11;

Described pipe three 13 is connected up and down with pipe two 12, and communicates, and wherein the upper end of pipe three 13 is installed with throttle valve (not shown in the figure), thereby lubricating oil keeps flowing outward at a stable flow;

The weight block 2 is annular, coaxial with the pipe one 11, the pipe two 12, and the pipe three 13, the inner diameter of the weight block 2 is the same as the diameter of the pipe three 13, the weight block 2 is nested in the pipe three 13, and the bottom surface of the weight block 2 is connected to the pipe three Two 12 upper end faces are fixed;

Through the pressing force of the weight 2, the tube one 11 and the tube two 12 can be recovered accurately in the re-stretched state, so as to prevent the sealing ring 111 of the tube one 11 and the fitting part 121 of the tube two 12 from being on the tube two 12 and 12 respectively. Tube one 11 produces friction, resulting in a stuck;

The lower end of the oil collecting shell 3 is trumpet-shaped, and the upper end is cylindrical. The trumpet-shaped lower end surface of the oil collecting shell 3 is connected with the top surface of the weight 2, and wraps the tube 3 13, wherein the lower side of the outer surface of the oil collecting shell 3 has a trumpet-shaped opening. There are a plurality of openings 31, a plurality of openings 32 are provided on the outer surface of the oil collecting shell 3 in a cylindrical shape, and a plurality of guide plates 33 are installed inside the oil collecting shell 3;

There is a certain distance between the upper end of the pipe three 13 and the inner top surface of the oil collecting shell 3;

The plurality of openings 1 31 and the second opening 32 are evenly arranged along the wall surface of the oil collecting shell 3, and the oil intake of the second opening 32 and the opening one 31 is greater than the oil output of the third pipe 13;

The number of the guide plates 33 is the same as that of the opening two 32 , the plurality of guide plates 33 are arranged obliquely downward, and the upper ends of the plurality of guide plates 33 are connected with the upper end surface of the opening two 32 , and the lower ends of the plurality of guide plates 33 face the opening one 31 respectively. ;

The opening two 32 is located in the oil-rich layer, the lubricating oil enters the oil collecting shell 3 along the opening two 32, the opening one 31 is located below the oil-rich layer, and part of the lubricating oil and the liquid enter the oil collecting shell 3 together, and the lubricating oil enters the oil collecting shell 3 along the opening two 32. The lubricating oil flows downward through the guidance of the guide plate 33, and the lubricating oil and the liquid are layered in the oil collecting shell 3, and then upward. During this process, the lubricating oil entering along the opening two 32 will enter along the opening one 31. When the lubricating oil is continuously injected into the oil collecting shell 3, due to the low density of the lubricating oil, a small amount of liquid is forced to gather at the lower end of the oil collecting shell 3 until a small amount of liquid is squeezed out along the opening 31 The oil collecting shell 3, so that only the lubricating oil can be retained in the oil collecting shell 3;

The float 4 is fixed on the top surface of the oil collecting shell 3, and the oil collecting shell 3 is located below the liquid level through the float 4, and can move up and down with the rise or fall of the liquid level;

The working principle of the present invention

As shown in FIG. 3 , the lubricating oil enters the oil collecting shell 3 along the opening 2 32 , part of the lubricating oil and liquid enter the oil collecting shell 3 along the opening 1 31 , and the lubricating oil entering along the opening 2 32 flows down the guide plate 33 and The lubricating oil and the liquid are layered in the oil collecting shell 3. During this process, the lubricating oil entering along the opening two 32 will squeeze out part of the liquid entering along the opening one 31. Due to the low density of the lubricating oil, a small amount of liquid is forced. The liquid gathers at the lower end of the oil collecting shell 3, the lubricating oil is located above the oil collecting shell 3, and the lubricating oil is continuously injected into the oil collecting shell 3 until a small amount of liquid is squeezed out of the oil collecting shell 3 along the opening 31, so that the oil collecting shell 3 Only the lubricating oil is kept. When the liquid level fluctuates or tilts, the lubricating oil in the oil collecting shell 3 is full, which will not affect the lubricating oil in the oil collecting shell 3, so that the lubricating oil flows stably to the pipe 3 13, thereby ensuring Return oil, as shown in Figure 4, when the liquid level moves up or down, the oil collecting shell 3 rises or falls with the liquid level through the float 4, so that the oil collecting shell 3 and the liquid level are always kept at a fixed distance .

The present invention also provides an air-conditioning unit. The air-conditioning unit adopts the above-mentioned oil return device, and the pipe one 11 of the oil return device is connected with the oil outlet of the low-pressure circulating liquid storage tank 5 .

The air-conditioning unit of the present invention adopts the above-mentioned oil return device, which can perform reliable and stable oil return.

Claims

An oil return device, comprising an oil return pipe (1) and a low-pressure circulating liquid storage tank (5), characterized in that: the oil return pipe (1) is arranged at the bottom of the low-pressure circulating liquid storage tank (5); the oil return pipe ( 1) The lower end is fixedly connected to the bottom of the low-pressure circulating liquid storage tank (5); the oil return pipe (1) includes a pipe one (11), and the lower end of the first pipe (11) is fixedly connected to the bottom of the low-pressure circulating liquid storage tank (5) The top of the pipe one (11) is slidably connected with a pipe two (12), and the top of the pipe two (12) is slidably connected with a pipe three (13); the top of the pipe three (13) is provided with a throttle valve A weight (2) is sleeved at the lower end of the third pipe (13), the bottom of the weight (2) is fixedly connected with the top of the second pipe (12); the top of the weight (2) is fixedly connected with an oil collecting shell (3); a float (4) is fixedly connected to the top of the oil collecting shell (3); opening two (32) and opening one (31) are sequentially opened above and below the outer surface of the oil collecting shell (3); A guide plate (33) is fixedly connected inside the oil collecting shell (3) close to the upper side of the second opening (32).
The oil return device according to claim 1, characterized in that: the lower end of the second pipe (12) is provided with a fitting portion (121), and the fitting portion (121) is connected to the pipe through a sealing ring (111). One (11) slip connection.
The oil return device according to claim 1, characterized in that: the first opening (31) and the second opening (32) are provided with a plurality of them and are evenly arranged according to the wall surface of the oil collecting shell (3).
An oil return device according to claim 1, characterized in that: the oil intake of the second opening (32) and the opening one (31) is greater than the oil output of the pipe three (13).
An air-conditioning unit, characterized in that: the air-conditioning unit adopts the oil return device according to any one of claims 1-4.