Oil return mechanism of electric scroll compressor of automobile air conditioner

Abstract

The utility model relates to an oil return mechanism of an electric scroll compressor of an automobile air conditioner, a de-noising rod is arranged in a high-pressure oil return hole channel of the oil return structure for connecting a high-pressure oil storage pool and a low-pressure cavity, a longitudinal tooth groove is arranged on the surface of the de-noising rod, and the inner wall of the high-pressure oil return hole channel and the tooth groove form a small hole channel. The noise elimination rod effectively changes the gas flowing state, and eliminates buzzing noise generated by gas flowing when high-pressure oil gas in the exhaust high-pressure cavity passes through the oil return throttling channel.

Description

Technical Field

[0001] This utility model relates to the field of noise reduction technology for electric scroll compressors, and in particular to an oil return mechanism for an electric scroll compressor for automotive air conditioning. Background Technology

[0002] As a type of rotating fluid machinery, electric scroll compressors require an effective and reliable oil circulation system to ensure the lubrication and sealing of their internal core components. Especially in recent years, the operating speed of scroll compressors has reached around 10,000 RPM, which necessitates better lubrication of the internal components, thus forcing the compressor to be designed with an effective and better oil return structure.

[0003] Current oil return structure design, such as Figure 1 , Figure 2 As shown, the compressed high-pressure oil-containing gas passes through an oil-gas separator, separating the refrigerant oil into the high-pressure oil storage tank 1, and then flows to the high-pressure oil return channel 3. From there, it flows through the small-diameter throttling pipe 4 to the throttling capillary tube 5 for pressure reduction before being discharged to the low-pressure chamber 2 to lubricate the components. When the compressor stops operating, the high-pressure side of the entire refrigeration system still maintains a relatively high pressure. This pressure is continuously released to the low-pressure side through the high-pressure oil return channel 3. Since the compressor stops compressing, it no longer supplies pressure to the high-pressure side, causing the high-pressure side pressure to gradually decrease and the low-pressure side pressure to gradually increase until the pressure on both sides of the system reaches equilibrium. During this pressure equilibrium process, at a certain pressure difference, when the high-pressure gas passes through the small-diameter throttling pipe 4, the airflow changes drastically, producing a buzzing sound, which creates noise and affects user comfort. Utility Model Content

[0004] The purpose of this invention is to provide an oil return mechanism for an electric scroll compressor for automotive air conditioning, which solves the problem that in the prior art, when high-pressure gas passes through a throttling orifice under a specific pressure difference, the airflow changes drastically, producing a buzzing sound.

[0005] To achieve the above objectives, the technical solution of this utility model is as follows:

[0006] An oil return mechanism for an electric scroll compressor for automotive air conditioning includes a high-pressure oil reservoir and a low-pressure chamber, as well as an oil return structure connecting the high-pressure oil reservoir and the low-pressure chamber. The oil return structure includes a high-pressure oil return channel, a throttling buffer channel, and a throttling capillary tube. The high-pressure oil return channel opens into the high-pressure oil reservoir, and the high-pressure oil return channel, the throttling buffer channel, and the throttling capillary tube are connected in sequence. The throttling capillary tube opens into the low-pressure chamber. A noise-reducing rod is provided inside the high-pressure oil return channel, and longitudinal toothed grooves are provided on the surface of the noise-reducing rod. The inner wall of the high-pressure oil return channel and the toothed grooves form a fine channel.

[0007] The noise reduction rod has three or more longitudinal toothed grooves on its surface, and the cross-section of the noise reduction rod is gear-shaped. The noise reduction rod is interference-fitted with the high-pressure return oil channel.

[0008] The surface of the noise reduction rod is provided with eight toothed grooves, and the cross-section of the small channel formed by the toothed grooves and the inner wall of the high-pressure return oil channel is fan-shaped.

[0009] The inner diameter of the high-pressure return oil channel is 4mm, and the cross-sectional area of ​​the small channel formed by the toothed groove and the inner wall of the high-pressure return oil channel is 0.25mm². 2 .

[0010] The inner diameter of the throttling buffer channel is at least 3 mm.

[0011] The noise-canceling rod is made of a material that can withstand temperatures up to 180°C.

[0012] The noise-canceling rod is made of metal or nylon.

[0013] The advantages of this utility model are as follows: 1. A noise-reducing rod is press-fitted into the high-pressure return oil channel, which effectively changes the gas flow state. Combined with a throttling buffer channel, it replaces the small-diameter throttling tube in the prior art, and more effectively plays the role of throttling, reducing pressure and speed, thereby reducing the pressure difference at both ends of the capillary throttling tube and eliminating the buzzing noise caused by the rapid change of airflow; 2. The noise-reducing rod with toothed grooves on its surface plays the role of initial damping and pressure reduction, so that the flow rate and pressure of the high-pressure oil and gas passing through it can be reduced; 3. Due to the small diameter and large hole depth of the existing small-diameter throttling tube, the processing time is long during the production of parts, and the processing tools are prone to breakage. This utility model eliminates the small-diameter throttling tube in the prior art and replaces it with a throttling buffer channel with a slightly larger diameter, saving processing costs and improving production efficiency. Attached Figure Description

[0014] Figure 1 This is a longitudinal section view of the oil return mechanism with a small-diameter throttling pipe in the prior art;

[0015] Figure 2 This is a cross-sectional view of the oil return mechanism with a small-diameter throttling pipe in the prior art;

[0016] Figure 3 This is a longitudinal section view of the oil return mechanism of this utility model.

[0017] Figure 4 This is a cross-sectional structural diagram of the oil return mechanism of this utility model;

[0018] Figure 5 This is a cross-sectional structural diagram of the noise-reducing rod of this utility model.

[0019] In the diagram: 1-High-pressure oil storage tank; 2-Low-pressure chamber; 3-High-pressure return oil channel; 4-Small-diameter throttling pipe; 5-Throttling capillary; 6-Throttling buffer channel; 7-Noise reduction rod; 71-Groove. Detailed Implementation

[0020] The present invention will be further described below with reference to the accompanying drawings. The drawings are for illustrative purposes only and should not be construed as limiting the scope of this patent.

[0021] To simplify the description of this embodiment, some components that are well-known to those skilled in the art but are not related to the main content of this invention may be omitted in the accompanying drawings or description. Additionally, for ease of description, some components in the drawings may be omitted, enlarged, or reduced, but these do not represent the actual product dimensions or the complete structure.

[0022] This utility model discloses an oil return structure for an electric scroll compressor of an automotive air conditioning system, such as... Figure 3 , Figure 4 As shown, it includes a high-pressure oil storage tank 1 and a low-pressure chamber 2, as well as an oil return structure connecting the high-pressure oil storage tank 1 and the low-pressure chamber 2; the oil return structure includes a high-pressure oil return channel 3, a throttling buffer channel 6 and a throttling capillary tube 5, wherein the high-pressure oil return channel 3 opens into the high-pressure oil storage tank 1, the high-pressure oil return channel 3, the throttling buffer channel 6 and the throttling capillary tube 5 are connected in sequence, and the throttling capillary tube 5 opens into the low-pressure chamber 2; a noise reduction rod 7 is provided in the high-pressure oil return channel 3, and the surface of the noise reduction rod 7 is provided with longitudinal toothed grooves 71, and the inner wall of the high-pressure oil return channel 3 and the toothed grooves 71 form a fine channel.

[0023] The noise reduction rod 7 can play the role of initial damping and pressure reduction, so that the flow rate and pressure of high-pressure oil and gas passing through it can be reduced. After the oil and gas is throttled and depressurized, it enters the throttle buffer channel 6 area, where the flow rate is further slowed down. Finally, it slowly enters the throttle capillary 5 for secondary throttle and pressure reduction before being depressurized to the low-pressure chamber 2.

[0024] The surface of the noise-canceling rod 7 is provided with three or more longitudinal grooves 71, such as... Figure 5 As shown, the cross-section of the noise reduction rod 7 is gear-shaped, and the noise reduction rod 7 is interference-fitted with the high-pressure return oil channel 3.

[0025] When high-pressure oil and gas pass through the noise-reducing rod 7 with toothed grooves 71, the fluid is cut into multiple small channels by the toothed grooves 71 of the noise-reducing rod 7 and the inner wall of the high-pressure return oil channel 3. Then, the flow is buffered and decelerated in the throttling buffer channel 6. At this time, the pressure difference between the two ends of the throttling capillary 5 is reduced, thus eliminating the buzzing noise.

[0026] Because the smaller the cross-sectional area of ​​the fine channel, the better the throttling and pressure reduction effect, preferably, the surface of the noise reduction rod 7 is provided with eight toothed grooves 71, and the cross-section of the fine channel formed by the toothed grooves 71 and the inner wall of the high pressure return oil channel 3 is fan-shaped.

[0027] Furthermore, the inner diameter of the high-pressure oil return channel 3 of this invention is 4mm, and the cross-sectional area of ​​the small channel formed by the toothed groove 71 and the inner wall of the high-pressure oil return channel 3 is 0.25mm². 2 .

[0028] The noise-dampening rod 7 should be made of a material that can withstand temperatures up to 180°C and should not chemically react with refrigerants or refrigeration oils. The noise-dampening rod 7 can be made of metal or nylon.

[0029] This utility model eliminates the small-diameter throttling tube 4 in the prior art and replaces it with a larger-diameter throttling buffer channel 6. The inner diameter of the throttling buffer channel 6 is at least 3mm, that is, not less than 3mm. It is not only easy to process and low in cost, but also has better pressure reduction and speed reduction effects.

[0030] The above description is merely a preferred embodiment of this utility model and is not intended to limit the scope of this utility model. All equivalent changes and modifications made within the scope of the claims of this utility model should be considered within the technical scope of this utility model.

Claims

1. An oil return mechanism for an electric scroll compressor for automotive air conditioning, comprising a high-pressure oil reservoir (1) and a low-pressure chamber (2), and an oil return structure connecting the high-pressure oil reservoir (1) and the low-pressure chamber (2); characterized in that: The oil return structure includes a high-pressure oil return channel (3), a throttling buffer channel (6), and a throttling capillary (5). The high-pressure oil return channel (3) opens into the high-pressure oil storage tank (1). The high-pressure oil return channel (3), the throttling buffer channel (6), and the throttling capillary (5) are connected in sequence. The throttling capillary (5) opens into the low-pressure chamber (2). A noise reduction rod (7) is provided inside the high-pressure oil return channel (3). The surface of the noise reduction rod (7) is provided with longitudinal toothed grooves (71). The inner wall of the high-pressure oil return channel (3) and the toothed grooves (71) form a small channel.

2. The oil return mechanism of claim 1, wherein: The surface of the noise reduction rod (7) is provided with more than three longitudinal toothed grooves (71), the cross-section of the noise reduction rod (7) is gear-shaped, and the noise reduction rod (7) is interference-fitted with the high pressure return oil channel (3).

3. The oil return mechanism of claim 2, wherein: The surface of the noise reduction rod (7) is provided with eight grooves (71), and the cross-section of the small channel formed by the grooves (71) and the inner wall of the high pressure return oil channel (3) is fan-shaped.

4. The oil return mechanism of claim 3, wherein: The high-pressure oil return hole (3) has an inner diameter of 4 mm, and the small hole formed by the tooth groove (71) and the inner wall of the high-pressure oil return hole (3) has a cross-sectional area of 0.25 mm 2 .

5. The oil return mechanism of claim 1, wherein: The inner diameter of the throttling buffer channel (6) is at least 3 mm.

6. The oil return mechanism of claim 1, wherein: The noise reduction bar (7) is made of a material that can withstand high temperatures of 180°C.

7. The oil return mechanism of claim 6, wherein: The noise-reducing rod (7) is a metal rod or a nylon rod.

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