A rotor compressor and a wind shield thereof

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By installing a wind deflector and an oil-gas separator on the lower end face of the rotary compressor, the problems of lubricating oil diffusion and balance block disturbance are solved, thereby achieving the effects of reducing oil discharge rate and improving rotational stability.

CN224532983UActive Publication Date: 2026-07-21NANCHANG HICHLY ELECTRICAL APPLIANCE +1

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Patent Information

Authority / Receiving Office: CN · China
Patent Type: Utility models(China)
Current Assignee / Owner: NANCHANG HICHLY ELECTRICAL APPLIANCE
Filing Date: 2025-07-25
Publication Date: 2026-07-21

AI Technical Summary

Technical Problem

During the discharge of high-pressure gas in a rotary compressor, the lubricating oil is prone to diffusion, leading to an increased oil discharge rate and affecting the lubrication effect. At the same time, the rotational disturbance of the balance block reduces efficiency.

Method used

A wind deflector, including an end plate and a surrounding plate, is installed on the lower end face of the rotor. The height of the surrounding plate is not less than that of the balance block. It guides the airflow and reduces diffusion. Combined with the oil-gas separator, it reduces the oil discharge rate and wind resistance.

Benefits of technology

It effectively reduces the oil discharge rate of the rotary compressor, improves the lubrication effect, reduces the wind resistance and airflow disturbance of the balance block, and improves the rotational stability and efficiency of the rotor.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model provides a kind of wind shield of rotor compressor, wind shield includes end plate and the surrounding board of setting in the outer periphery of end plate, end plate is set on the lower end surface of rotor, and its center is equipped with a center hole, center hole is communicated with the rotor through-flow hole of rotor, and surrounding board extends from end plate to the side away from rotor;Balance block is located on the bottom of end plate, the inboard of surrounding board, and the height of surrounding board is not less than the height of balance block, which is set on the lower end surface of rotor.The utility model has the beneficial effect that by setting the wind shield with height not less than balance block on the lower end surface of rotor, the problem of airflow diffusion and affecting stator cutting edge area lubricating oil backflow caused by the increase of upper cylinder cover height and the distance between upper muffler exhaust port and rotor through-flow hole after the increase of rotor compressor exhaust capacity is alleviated, effectively reducing the oil discharge rate of rotor compressor, and also achieving the purpose of reducing balance block wind resistance and reducing airflow disturbance.

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Description

Technical Field

[0001] This utility model relates to the field of rotary compressor technology, and in particular to a rotary compressor and its windshield. Background Technology

[0002] A rotary compressor typically includes a housing, a pump body assembly, a motor assembly, an intake pipe, and an exhaust pipe. The motor assembly includes a stator and a rotor, with the rotor having a through-hole. The pump body assembly is located below the motor assembly and includes a cylinder, an upper cylinder head mounted on the cylinder, and an upper muffler mounted on the upper cylinder head. The upper end of the crankshaft is connected to the rotor, and the lower end passes through the upper muffler and the upper cylinder head, connecting to the piston inside the cylinder.

[0003] During compressor operation, the rotor rotates inside the stator, driving the piston to move eccentrically within the cylinder via the crankshaft. This compresses the low-pressure gas entering the cylinder through the intake manifold, creating high-pressure gas. The high-pressure gas then passes through the rotor's flow holes to the top of the casing and is output to the heat exchange system via the exhaust pipe. To ensure the normal operation of the rotary compressor, a lubricating oil sump at the bottom of the casing stores lubricating oil. During operation, this lubricating oil flows through the oil channels inside the crankshaft into various internal components of the compressor for lubrication. As the high-pressure gas is discharged upwards, some of the lubricating oil mixes with it, forming an oil-gas mixture that enters the heat exchange system along with the gas. This oil film on the tube walls of the heat exchange system negatively impacts heat exchange efficiency.

[0004] Currently, with the increase in displacement of rotary compressors, the height of the upper cylinder head is increased to ensure crankshaft stability during operation. However, an excessively high upper cylinder head increases the distance between the upper muffler and the rotor flow holes, increasing the likelihood of high-pressure gas spreading outwards after exiting the upper muffler. Since most of the lubricating oil in the rotary compressor is carried back to the oil sump by the downward-flowing gas in the stator tangential area, the gas spreading outwards will obstruct this downward flow and may cause large lubricating oil droplets to break down into smaller droplets that are more easily carried by the high-pressure gas. This leads to an increased compressor oil discharge rate, a low oil level in the oil sump, insufficient lubrication inside the pump body components, and an increased risk of wear on the pump body components.

[0005] On the other hand, since the lower end face of the rotor is generally equipped with a balance block to achieve dynamic balance when the rotor rotates, the balance block will also cause a certain disturbance to the airflow in the casing when it rotates with the rotor, affecting the rotational stability of the rotor, and generating a large amount of kinetic energy loss and airflow noise, thus reducing the operating efficiency of the rotary compressor. Utility Model Content

[0006] The purpose of this invention is to provide a windshield for a rotary compressor, which can reduce airflow disturbance and lower the oil discharge rate of the rotary compressor.

[0007] This utility model provides a windshield for a rotary compressor. The windshield includes an end plate and a surrounding plate disposed on the outer periphery of the end plate. The end plate is disposed on the lower end surface of the rotor and has a central hole at its center, which communicates with the rotor flow hole of the rotor. The surrounding plate extends from the end plate to the side away from the rotor. A balance block disposed on the lower end surface of the rotor is located at the bottom of the end plate and inside the surrounding plate. The height of the surrounding plate is not less than the height of the balance block.

[0008] Preferably, on a plane perpendicular to the axis of the rotor, the projection of the rotor flow passage is located inside the projection of the central hole.

[0009] Preferably, the end plate is provided with a plurality of first connecting holes spaced circumferentially along the central hole, and the first connecting holes are connected to the rotor by fasteners.

[0010] Preferably, the balance block is provided with a plurality of second connecting holes spaced apart, and the fastener passes through the second connecting holes and the first connecting hole in sequence and is connected to the rotor.

[0011] Preferably, the height of the enclosure is greater than the height of the balance block, and the height difference between the enclosure and the balance block is not less than 2mm.

[0012] Preferably, the inner diameter of the enclosure is equal to the outer diameter of the balance block.

[0013] Preferably, the outer diameter of the enclosure is smaller than the outer diameter of the rotor.

[0014] This utility model also provides a rotary compressor, including the aforementioned windshield.

[0015] Preferably, the upper end face of the rotor is further provided with an oil-gas separator, which is connected to the rotor flow passage and is used to separate the oil-gas mixture discharged from the rotor flow passage.

[0016] The advantage of this utility model is that by setting a windshield with a height not less than that of the balance block on the lower end face of the rotor, the problems of airflow diffusion caused by the increase in the height of the upper cylinder head and the excessive distance between the exhaust port of the upper muffler and the rotor flow hole after the increase in the discharge volume of the rotor compressor are effectively alleviated, thus reducing the oil discharge rate of the rotor compressor. At the same time, it also achieves the purpose of reducing the wind resistance of the balance block and reducing airflow disturbance. Attached Figure Description

[0017] Figure 1 This is a partial sectional view of the rotary compressor of this utility model;

[0018] Figure 2This is a schematic diagram of the assembly structure of the windshield on the rotor;

[0019] Figure 3 It is a 3D view of the windshield;

[0020] Figure 4 This is a side view of the windshield;

[0021] Figure 5 These are the side and top views of the balance block.

[0022] Component designation explanation:

[0023] 1. Shell

[0024] 21 Rotors

[0025] 211 Shaft Hole

[0026] 212 Rotor flow passage

[0027] 22 Stator

[0028] 3. Upper cylinder head

[0029] 4. Upper silencer

[0030] 5. Windshield

[0031] 51 end plate

[0032] 511 Center Hole

[0033] 512 First connecting hole

[0034] 52. Enclosure

[0035] 6 balance blocks

[0036] 61 Second connecting hole

[0037] 7. Oil-gas separator

[0038] 8 Crankshaft Detailed Implementation

[0039] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings. These embodiments are only used to illustrate this utility model and are not intended to limit it.

[0040] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0041] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0042] Furthermore, in the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0043] Figure 2 This is a schematic diagram of the assembly structure of the windshield on the rotor. In the following description, it will be referred to as... Figure 2 The attached diagram serves as a reference for orientation, defining the axial direction of rotor 21 as the up-down direction, with oil-gas separator 7 located above windshield 5.

[0044] like Figure 1 and Figure 2 As shown, the rotary compressor includes a housing 1, a pump assembly, and a motor assembly. The motor assembly includes a stator 22 and a rotor 21 disposed inside the stator 22. The rotor 21 has a shaft hole 211 extending along its own axial direction and multiple rotor flow holes 212. Both the shaft hole 211 and the rotor flow holes 212 penetrate the upper and lower end faces of the rotor 21. The shaft hole 211 is located at the center of the rotor 21 and is used for the crankshaft 8 to pass through. The multiple rotor flow holes 212 are distributed circumferentially around the shaft hole 211 to allow the high-pressure gas inside the rotary compressor to flow upward. The pump assembly is located below the motor assembly and includes a cylinder, an upper cylinder head 3 disposed on the cylinder, and an upper muffler 4 disposed on the upper cylinder head 3. The upper end of the crankshaft 8 is connected to the rotor 21, and the lower end passes through the upper muffler 4 and the upper cylinder head 3 and is connected to the piston inside the cylinder. Lubricating oil is stored at the bottom of the housing 1. During the operation of the rotary compressor, the lubricating oil enters the various components inside the rotary compressor through the oil delivery channel inside the crankshaft 8 for lubrication.

[0045] In the design of large displacement compressors, in order to ensure the reliability and stability of crankshaft 8 rotation, the height H1 of upper cylinder head 3 will be continuously increased, and the distance H2 from the upper end face of upper muffler 4 to the lower end face of rotor flow hole 212 will also increase accordingly. This will increase the possibility of high pressure gas spreading to the surroundings after being discharged from upper muffler 4.

[0046] In order to reduce the impact of gas diffusion and diversion on the airflow direction inside the rotary compressor, this utility model provides a windshield for a rotary compressor and a rotary compressor equipped with the windshield.

[0047] like Figure 1-3 As shown, the windshield 5 includes an end plate 51 and a surrounding plate 52 disposed around the outer periphery of the end plate 51. The end plate 51 is disposed on the lower end face of the rotor 21, and a central hole 511 is provided at its center. The central hole 511 is coaxially disposed with the shaft hole 211, facilitating the passage of the crankshaft 8. At the same time, on a plane perpendicular to the axis of the rotor 21, the projections of multiple rotor flow holes 212 are all located inside the projection of the central hole 511, so that the central hole 511 is connected to the shaft hole 211 and the multiple rotor flow holes 212 respectively. In this way, while ensuring that the crankshaft 8 can pass through the central hole 511 and the shaft hole 211, it is also ensured that the oil-gas mixture in the rotor compressor can smoothly pass through the central hole 511 and through the rotor flow holes 212 to pass through the rotor 21. The enclosure 52 extends from the end plate 51 to the side away from the rotor 21 (i.e., below). The balance block 6, which is set on the lower end face of the rotor 21, is located at the bottom of the end plate 51 and inside the enclosure 52. The height of the enclosure 52 is not less than the height of the balance block 6.

[0048] By providing the wind deflector 5 of this invention on the lower end face of the rotor 21, the wind deflector 5 can guide the high-pressure gas discharged from the upper silencer 4 to flow upward and enter the rotor flow passage 212. This reduces the impact caused by the increased distance H2 between the upper end face of the upper silencer 4 and the lower end face of the rotor flow passage 212 to a certain extent, reducing the possibility of high-pressure gas diffusing to the surroundings. This ensures that the lubricating oil can smoothly return to the oil sump under the influence of the downward gas in the stator tangent area, thereby reducing the oil discharge rate of the rotor compressor. At the same time, the wind deflector 5 can also shield the balance block 6, preventing the balance block 6 from causing significant disturbance to the airflow inside the housing 1 when it rotates, reducing the wind resistance on the balance block 6, and improving the rotational stability of the rotor 21.

[0049] like Figure 1 , Figure 4 and Figure 5As shown, the height of the balance block 6 is H3, and the height of the surrounding plate 52 is H4. The height relationship between the surrounding plate 52 and the balance block 6 should satisfy H4≥H3, more preferably, H4>H3, and the height difference between the two is H4-H3≥2mm. This arrangement is more conducive to preventing the high-pressure gas discharged from the upper silencer 4 from spreading to the surroundings and affecting the return of lubricating oil, and can reduce the wind resistance of the balance block 6.

[0050] like Figure 2-3 and Figure 5 As shown, in a specific embodiment of this utility model, the end plate 51 is provided with a plurality of first connecting holes 512 evenly spaced circumferentially along the central hole 511. The first connecting holes 512 are connected to the mounting holes in the rotor 21 by fasteners, specifically bolts, thereby fixing the windshield 5 to the lower end face of the rotor 21. Further, the balance block 6 is provided with a plurality of second connecting holes 61 spaced apart. Fasteners pass through the second connecting holes 61 and the first connecting holes 512 in sequence and are connected to the mounting holes in the rotor 21, thereby achieving relative fixation of the balance block 6 and the windshield 5 on the lower end face of the rotor 21.

[0051] like Figure 2 , Figure 4-5 As shown, the counterweight 6 is specifically arc-shaped, and its outer diameter D3 should be as close as possible to the inner diameter D1 of the surrounding plate 52. Ideally, the inner diameter D1 of the surrounding plate 52 should be equal to the outer diameter D3 of the counterweight 6, which helps to reduce wind resistance and vibration. The inner diameter of the counterweight 6 is not less than the diameter of the central hole 511, so the counterweight 6 will not block the central hole 511 or affect the upward flow of high-pressure gas.

[0052] Furthermore, such as Figure 1 and Figure 4 As shown, the outer diameter D2 of the enclosure 52 is smaller than the outer diameter D4 of the rotor 21. This arrangement can prevent the windshield 5 from interfering with other components.

[0053] Furthermore, such as Figure 2 As shown, an oil-gas separator 7 is also provided on the upper end face of the rotor 21. The oil-gas separator 7 is connected to the rotor flow hole 212 and is used to separate the oil-gas mixture discharged from the rotor flow hole 212, thereby further reducing the oil discharge rate of the rotary compressor. The oil-gas separator 7 specifically includes an upper baffle and / or an oil baffle plate.

[0054] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present utility model, and these improvements and substitutions should also be considered within the protection scope of the present utility model.

Claims

1. A windshield for a rotary compressor, characterized in that, The windshield (5) includes an end plate (51) and a surrounding plate (52) disposed on the outer periphery of the end plate (51). The end plate (51) is disposed on the lower end face of the rotor (21) and has a central hole (511) at its center. The central hole (511) is connected to the rotor flow hole (212) of the rotor (21). The surrounding plate (52) extends from the end plate (51) to the side away from the rotor (21). The balance block (6) disposed on the lower end face of the rotor (21) is located at the bottom of the end plate (51) and inside the surrounding plate (52), and the height of the surrounding plate (52) is not less than the height of the balance block (6).

2. The windshield according to claim 1, characterized in that, On a plane perpendicular to the axis of the rotor (21), the projection of the rotor flow hole (212) is located inside the projection of the central hole (511).

3. The windshield according to claim 1, characterized in that, The end plate (51) is provided with a plurality of first connecting holes (512) spaced circumferentially along the central hole (511), and the first connecting holes (512) are connected to the rotor (21) by fasteners.

4. The windshield according to claim 3, characterized in that, The balance block (6) is provided with a plurality of second connecting holes (61) spaced apart. The fastener passes through the second connecting holes (61) and the first connecting hole (512) in sequence and is connected to the rotor (21).

5. The windshield according to claim 1, characterized in that, The height of the enclosure (52) is greater than the height of the balance block (6), and the height difference between the enclosure (52) and the balance block (6) is not less than 2mm.

6. The windshield according to claim 1, characterized in that, The inner diameter of the enclosure (52) is equal to the outer diameter of the balance block (6).

7. The windshield according to claim 1, characterized in that, The outer diameter of the enclosure plate (52) is smaller than the outer diameter of the rotor (21).

8. A rotary compressor, characterized in that, Includes the windshield as described in any one of claims 1-7.

9. The rotary compressor according to claim 8, characterized in that, The upper surface of the rotor (21) is also provided with an oil-gas separator (7), which is connected to the rotor flow hole (212) and is used to separate the oil-gas mixture discharged from the rotor flow hole (212).