An air conditioning unit with an oil return device

Abstract

The present invention relates to the technical field of air conditioners, and particularly to an air conditioner unit with an oil return device, including components such as an oil return pipe, a weight, an oil collecting shell, and a float; and an air conditioner unit including the above-mentioned oil return device. In the present invention, the lubricating oil entering along the second opening flows downward along the guiding plate, extruding part of the liquid entering along the first opening. The lubricating oil is located below the oil collecting shell, and a small amount of liquid converges below the oil collecting shell. The lubricating oil continuously injects into the oil collecting shell until a small amount of liquid is extruded from the oil collecting shell along the first opening, so that only the lubricating oil is retained in the oil collecting shell, avoiding the problem that when there are fluctuations or inclinations, the liquid below is prone to surge upward, resulting in poor oil return or even inability to return oil; at the same time, by pressing down the oil return pipe with the weight, the pipe one and the pipe two can be accurately recovered under the stretching state, avoiding frictional jamming.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioners, and particularly to an air conditioner unit with an oil return device. Background Art

[0002] The existing oil return devices are widely used in industries such as air conditioners, refrigeration, and cold storage. The oil return device is an important component in an air conditioner unit, and the function of the oil return device affects the working efficiency of air conditioners, refrigeration, and cold storage. However, the oil return ports of some oil return devices are in a fixed state and cannot follow the change of the liquid level height. Due to misalignment, oil return cannot be achieved, and there is a hidden danger of the compressor running with insufficient oil.

[0003] To solve the above problems, the existing technology sets an active oil return port that can follow the liquid level change, but there are still deficiencies: First, the active oil return port can only follow the liquid level height change in the vertical direction limitedly. When the liquid level fluctuates or tilts, the liquid below is prone to surge upwards, making it difficult to ensure that the oil return port continuously absorbs lubricating oil, resulting in poor oil return or even inability to return oil; Second, the float slides along the guide rod, and there is friction and jamming. Summary of the Invention

[0004] Therefore, the present invention is made in view of the above problems. The purpose of the present invention is to provide an air conditioner unit with an oil return device. The present invention concentrates the lubricating oil and then extracts the concentrated lubricating oil to ensure the accuracy of extracting lubricating oil and avoid empty extraction or mis-extraction.

[0005] An air conditioner unit with an oil return device includes an oil return pipe and a low-pressure circulating liquid storage tank. 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 to the bottom of the low-pressure circulating liquid storage tank; the oil return pipe includes pipe one, and the lower end of pipe one is fixedly connected to the bottom of the low-pressure circulating liquid storage tank; a pipe two is slidably connected inside the top end of pipe one, and a pipe three is slidably connected inside the top end of pipe two; a throttle valve is arranged at the top end of pipe three, a weight is sleeved at the lower end of pipe three, and the bottom of the weight is fixedly connected to the top end of pipe two; a collecting oil shell is fixedly connected to the top of the weight; a float is fixedly connected to the top of the collecting oil shell; an opening two and an opening one are sequentially arranged above and below the outer surface of the collecting oil shell; a guiding plate is fixedly connected to the inside of the collecting oil shell near the upper side of opening two.

[0006] An air conditioner unit adopts the above oil return device, and the pipe one of the oil return device is communicated with the oil outlet of the low-pressure circulating liquid storage tank.

[0007] Advantageous Effects:

[0008] 1. In the present invention, the lubricating oil entering through opening two flows downward along the guiding plate, squeezing out part of the liquid entering through opening one. The lubricating oil is located below the oil collecting shell, and a small amount of liquid converges below the oil collecting shell. The lubricating oil continuously injects into the oil collecting shell until a small amount of liquid is squeezed out of the oil collecting shell through opening one, so that only the lubricating oil is retained in the oil collecting shell, avoiding the problem that when there is fluctuation or inclination, the liquid below is likely to surge upward, resulting in poor oil return or even inability to return oil.

[0009] 2. In the present invention, the heavy block presses down the oil return pipe, enabling pipe one and pipe two to be accurately recovered in a stretched state, avoiding friction and jamming.

[0010] 3. For the air conditioner unit of the present invention, due to the adoption of the above oil return device, the oil return is smooth and the operation is stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0012] Figure 2 It is a schematic diagram of the internal structure of the present invention.

[0013] Figure 3 It is a schematic diagram of the convergence of the lubricating oil of the present invention.

[0014] Figure 4 It is a schematic diagram of the floating of the oil return device of the present invention.

[0015] As shown in Figures 1 - 4: 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 - guiding plate, 111 - sealing ring, 121 - fitting part, 5 - low - pressure circulating liquid storage tank. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0016] The present invention will be further described below in conjunction with specific embodiments and the drawings. More details are set forth in the following description to facilitate a full understanding of the present invention. However, the present invention can obviously be implemented in many other ways different from this description. Those skilled in the art can make similar generalizations and deductions according to the actual application situation without departing from the connotation of the present invention. Therefore, the protection scope of the present invention should not be limited by the content of this specific embodiment.

[0017] As Figure 1 shown, an oil return device includes: an oil return pipe 1, a heavy block 2, an oil collecting shell 3, and a float 4;

[0018] As Figure 2 shown, the oil return pipe 1 is composed of pipe one 11, pipe two 12, and pipe three 13;

[0019] The first pipe 11 is vertically arranged in the low-pressure circulating liquid storage tank 5. The lower end of the first pipe 11 is communicated with the low-pressure circulating liquid storage tank 5. An inner seal ring 111 is installed inside the upper end of the first pipe 11.

[0020] The second pipe 12 has the same diameter as the inner diameter of the seal ring 111. The lower end of the second pipe 12 penetrates through the seal ring 111 and extends into the first pipe 11. The second pipe 12 is communicated with the first pipe 11. A fitting part 121 is provided at the lower end of the second pipe 12.

[0021] The fitting part 121 is annular. The outer wall of the fitting part 121 is in contact with the inner wall of the first pipe 11, so that the second pipe 12 can move vertically up and down along the first pipe 11.

[0022] The third pipe 13 is connected to and communicated with the second pipe 12 up and down. A throttle valve (not shown in the figure) is installed at the upper end of the third pipe 13, so that the lubricating oil flows out at a stable flow rate.

[0023] The weight 2 is annular and coaxial with the first pipe 11, the second pipe 12 and the third pipe 13. The inner diameter of the weight 2 is the same as the diameter of the third pipe 13. The weight 2 sleeves the third pipe 13, and the bottom surface of the weight 2 is fixed to the upper end surface of the second pipe 12.

[0024] By the pressing force of the weight 2, the first pipe 11 and the second pipe 12 can be accurately recovered in the stretched state, avoiding friction between the seal ring 111 of the first pipe 11 and the fitting part 121 of the second pipe 12 on the second pipe 12 and the first pipe 11 respectively, resulting in jamming.

[0025] 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 to the top surface of the weight 2 and wraps the third pipe 13. A plurality of first openings 31 are provided on the lower trumpet-shaped outer surface of the oil collecting shell 3, and a plurality of second openings 32 are provided on the upper cylindrical outer surface of the oil collecting shell 3. A plurality of guide plates 33 are installed inside the oil collecting shell 3.

[0026] There is a certain distance between the upper end of the third pipe 13 and the inner top surface of the oil collecting shell 3.

[0027] The plurality of first openings 31 and the second openings 32 are arranged uniformly along the wall surface of the oil collecting shell 3, and the oil inflow of the second openings 32 and the first openings 31 is greater than the oil outflow of the third pipe 13.

[0028] The number of the guide plates 33 is the same as that of the second openings 32. The plurality of guide plates 33 are arranged obliquely downward, and the upper ends of the plurality of guide plates 33 are connected to the upper end surfaces of the second openings 32. The lower ends of the plurality of guide plates 33 are respectively directed towards the first openings 31.

[0029] The second opening 32 is located in the rich oil layer. The lubricating oil enters the oil collecting shell 3 along the second opening 32. The first opening 31 is located below the rich oil layer. Part of the lubricating oil and the liquid enter the oil collecting shell 3 together. The lubricating oil entering along the second opening 32 first flows downward under the guidance of the guiding plate 33, and the lubricating oil and the liquid are stratified in the oil collecting shell 3, and then upward. During this process, the lubricating oil entering along the second opening 32 will squeeze out part of the liquid entering along the first opening 31. When the lubricating oil is continuously injected into the oil collecting shell 3, because the density of the lubricating oil is smaller than that of the liquid, a small amount of liquid is forced to converge at the lower end of the oil collecting shell 3 until a small amount of liquid is squeezed out of the oil collecting shell 3 along the first opening 31, so that only the lubricating oil can be retained in the oil collecting shell 3;

[0030] The float 4 is fixed on the top surface of the oil collecting shell 3. Through the float 4, the oil collecting shell 3 is located below the liquid level and can move up and down with the rise or fall of the liquid level.

[0031] Working principle of the present invention

[0032] As Figure 3 shown, the lubricating oil enters the oil collecting shell 3 along the second opening 32, and part of the lubricating oil and the liquid enter the oil collecting shell 3 along the first opening 31. The lubricating oil entering along the second opening 32 flows downward along the guiding plate 33, and the lubricating oil and the liquid are stratified in the oil collecting shell 3. During this process, the lubricating oil entering along the second opening 32 will squeeze out part of the liquid entering along the first opening 31. Because the density of the lubricating oil is smaller than that of the liquid, a small amount of liquid is forced to converge at the lower end of the oil collecting shell 3. The lubricating oil is located above the oil collecting shell 3. 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 first opening 31, so that only the lubricating oil is retained in the oil collecting shell 3. When the liquid level fluctuates or tilts, the lubricating oil in the oil collecting shell 3 is in a full state, which will not affect the lubricating oil in the oil collecting shell 3, so that the lubricating oil can flow stably to the third pipe 13, thus ensuring the oil return. As Figure 4 shown, when the liquid level moves up or down, the oil collecting shell 3 is made to move up or down with the liquid level through the float 4, so that the oil collecting shell 3 and the liquid level always maintain a fixed distance.

[0033] The present invention also provides an air-conditioning unit, and the air-conditioning unit adopts the above-mentioned oil return device. The first pipe 11 of the oil return device is communicated with the oil outlet of the low-pressure circulating liquid storage tank 5.

[0034] The air-conditioning unit of the present invention adopts the above-mentioned oil return device and can perform reliable and stable oil return.

Claims

1. An oil return device, comprising an oil return pipe (1) and a low-pressure circulating liquid storage tank (5), characterized in that: The return oil pipe (1) is arranged at the bottom of the low-pressure circulating liquid storage tank (5); the lower end of the return oil pipe (1) is fixedly connected to the bottom of the low-pressure circulating liquid storage tank (5); the return oil pipe (1) includes a first pipe (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); a second pipe (12) is slidably connected inside the top end of the first pipe (11), and a third pipe (13) is slidably connected inside the top end of the second pipe (12); a throttle valve is arranged at the top end of the third pipe (13), a weight (2) is sleeved at the lower end of the third pipe (13), and the bottom of the weight (2) is fixedly connected to the top end of the second pipe (12); a oil collecting shell (3) is fixedly connected to the top of the weight (2); a float (4) is fixedly connected to the top of the oil collecting shell (3); an opening two (32) and an opening one (31) are sequentially arranged above and below the outer surface of the oil collecting shell (3); a guiding plate (33) is fixedly connected inside the oil collecting shell (3) near the upper side of the opening two (32).

2. The oil return device according to claim 1, characterized in that: A fitting part (121) is arranged at the lower end of the second pipe (12), and the fitting part (121) is slidably connected to the first pipe (11) through a sealing ring (111).

3. The oil return device according to claim 1, characterized in that: A plurality of the opening one (31) and the opening two (32) are arranged and uniformly arranged along the wall surface of the oil collecting shell (3).

4. The oil return device according to claim 1, characterized in that: The oil inlet amount of the opening two (32) and the opening one (31) is greater than the oil outlet amount of the third pipe (13).

5. An air-conditioning unit, characterized in that: The air conditioner unit adopts the oil return device described in any one of claims 1-4.

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