A lubricating device for a side main shaft support structure of a screw compressor

Abstract

This utility model discloses a lubrication device for the side main shaft support structure of a screw compressor, including a compressor body, a motor, and a motor rotor. The compressor body has an internal lubrication oil chamber and a male rotor coaxially and rotatably mounted with the motor rotor. The motor end has a motor cover, and the inner side of the motor cover has a stable support seat for supporting the male rotor. A storage cavity is formed on the side of the stable support seat near the male rotor. A smooth drainage hole communicating with the lubrication oil chamber and the storage cavity is formed in the middle of the stable support seat for stable support and lubrication of the cantilever rotor of the screw compressor. A connecting bearing is provided on the stable support seat, and the male rotor is connected to the connecting bearing. This lubrication device for the support structure in a screw compressor can provide continuous and highly stable lubrication for the cantilever rotor in the screw compressor.

Description

Technical Field

[0001] This utility model relates to a screw compressor, and more particularly to a lubrication device for the side main shaft support structure of a screw compressor. Background Technology

[0002] A screw compressor is a positive displacement rotary compressor. It contains two meshing rotors that compress gas by the periodic change in the volume between the rotor teeth during meshing. During compression, the rotors continue to rotate, and the tip of the male rotor's teeth gradually inserts into the groove of the female rotor's teeth, continuously reducing the volume between the teeth and forcibly compressing the gas, thus increasing its pressure. During compression, an oil-injected screw simultaneously injects lubricating oil, which mixes with the gas to form an oil-gas mixture. The lubricating oil absorbs the heat of compression and fills the gaps between the teeth, improving sealing efficiency. The compression ratio is determined by the rotor tooth profile, length, and exhaust port position. When the volume between the teeth shrinks to the point where it connects with the exhaust port, the high-pressure gas (or oil-gas mixture) is discharged through the exhaust port. As the rotors continue to rotate, the small amount of gas remaining between the teeth is squeezed out. The injected lubricating oil then seals, cools, and lubricates the gas, further improving compression efficiency and stability until the next cycle begins.

[0003] A screw compressor consists of a pair of meshing male and female rotors that perform intake, compression, and exhaust. The higher the horsepower (HP) of a screw compressor, the larger its displacement, and therefore the greater the power of its motor. Currently, screw compressors use a cantilevered rotor assembly structure. This results in a heavy motor, and the cantilevered rotor can cause misalignment with the internal rotor of the compressor, rubbing against the stator and causing damage, thus affecting the normal operation of the high-power screw compressor. Therefore, ensuring the effective operation of the cantilevered rotor in a high-power screw compressor is crucial. For these reasons, it is necessary to design a lubrication device that stably supports the cantilevered rotor and provides continuous, high-stability lubrication. Utility Model Content

[0004] In view of the above-mentioned problems in the prior art, the purpose of this utility model is to provide a lubrication device for the side main shaft support structure of a screw compressor, which realizes the stable support of the cantilever rotor in the screw compressor and provides continuous and highly stable lubrication.

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

[0006] A lubrication device for a screw compressor side main shaft support structure includes a compressor body, a motor, and a motor rotor. The compressor body has a lubricating oil chamber and a male rotor that is coaxially and rotatably mounted with the motor rotor. The motor end has a motor cover, and the inner side of the motor cover has a stable support seat for supporting the male rotor. The stable support seat has a storage cavity on the side near the male rotor. The middle of the stable support seat has a smooth drainage hole that communicates with the lubricating oil chamber and the storage cavity, for stabilizing support and lubricating the cantilever rotor of the screw compressor.

[0007] Preferably, the stabilizing support is provided with a connecting bearing, the male rotor is connected to the connecting bearing through the bearing, and the stabilizing support is located between the motor rotor and the male rotor for stable support of the cantilever end of the male rotor.

[0008] Preferably, the compressor body has a suction chamber for cooling the compressor body, characterized in that the left and right sides of the connecting bearing are connected, and the storage chamber is connected to the suction chamber through the connecting bearing for continuous lubrication of the stable support.

[0009] Preferably, the smooth flow hole is provided with a flow-blocking structure inside the lubricating oil cavity, and the smooth flow hole is provided with a self-sealing seepage structure inside the storage cavity, for the purpose of stabilizing the lubrication of the support seat.

[0010] Preferably, the self-sealing seepage structure includes a plug body that penetrates the male rotor and a plug head disposed at the end. A seepage hole is provided through the middle of the plug body and the plug head. A self-sealing pin is sleeved inside the seepage hole in the plug body. The self-sealing pin is made of tin bronze.

[0011] Preferably, the end of the plug body is provided with a chamfered opening, and the self-sealing pin is located near the chamfered opening. The end of the seepage hole near the plug head is tapered inward, and the seepage hole is smaller than the inner diameter of the chamfered opening.

[0012] Preferably, the storage cavity is provided with an oil equalization and cooling component, and a gap is provided between the oil equalization and cooling component and the male rotor for connecting the bearing for uniform oil delivery.

[0013] Preferably, the oil equalization and cooling component includes a damping sleeve connected to the stable support base. One end of the damping sleeve is provided with a spring, and the end of the spring is provided with a baffle. The outer end of the baffle is provided with a uniform groove of a hemispherical structure, and the other end of the baffle is provided with a storage part that penetrates the spring for connecting the bearing for full lubrication.

[0014] Compared with existing technologies, the lubrication device for the main shaft support structure of the screw compressor provided by this utility model can provide stable support for the cantilever rotor in the screw compressor and provide continuous and highly stable lubrication. Specifically, the stable support seat facilitates the support of the cantilever end of the cantilever rotor, and the male rotor in the compressor and the motor rotor are coaxially arranged to ensure the stable use of the rotor and stator of the high-power motor, avoid rotor and stator rubbing, and increase the meshing stability between the male and female rotors. Then, the opening of the smooth drainage hole in the middle of the male rotor facilitates the connection between the compressor's lubricating oil chamber and the storage chamber in the stable support seat, and leads the high-pressure lubricating oil in the lubricating oil chamber to the storage chamber for lubrication of the stable support seat and connecting bearings. The structure is simple, does not require an external lubricating oil delivery structure, has low lubrication cost, and high safety, which is very beneficial for the lubrication of screw compressors.

[0015] Furthermore, by incorporating interception and self-sealing drainage structures within the stable drainage holes, the lubricating oil can be intercepted, allowing the high-pressure lubricating oil to be slowly guided to the stable support base for lubrication of the connecting bearing within the structure. The through-hole design on both sides of the connecting bearing facilitates the lubricating oil being pumped along with the refrigeration vapor inside the compressor to the suction chamber and discharged, achieving circulation. The oil equalization and cooling components within the storage chamber ensure continuous oil supply to the connecting bearing. The hemispherical uniform grooves fully cover the continuous bearing with lubricating oil, improving heat dissipation efficiency. The storage compartment stores an appropriate amount of lubricating oil, enhancing the sustained stability of the lubrication effect.

[0016] It should be understood that the general descriptions and details herein are exemplary and illustrative only and are not intended to limit this disclosure.

[0017] This application provides an overview of various implementations or exemplary embodiments of the technology described in this disclosure, and is not a full disclosure of the entire scope or all features of the disclosed technology. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the lubrication device for the side main shaft support structure of the screw compressor of this utility model.

[0019] Figure 2 This is a partial structural diagram of the stabilizing support seat and the male rotor in the lubrication device for the side main shaft support structure of the screw compressor of this utility model;

[0020] Figure 3 This is a diagram showing the position of the motor cover in the compressor body of the lubrication device for the side main shaft support structure of the screw compressor of this utility model.

[0021] Figure 4This is a partial structural diagram of the lubrication device for the main shaft support structure of the screw compressor of this utility model, which connects the bearing and the self-sealing seepage structure.

[0022] Figure 5 This is a cross-sectional view of the self-sealing seepage structure in the lubrication device for the side main shaft support structure of the screw compressor of this utility model.

[0023] Figure 6 This is a schematic diagram of the oil equalization and cooling component in the lubrication device for the side main shaft support structure of the screw compressor of this utility model.

[0024] Key reference numerals:

[0025] 1. Compressor body; 2. Male rotor; 3. Lubricating oil chamber; 4. Motor rotor; 5. Motor cover; 6. Stabilizing support; 7. Connecting bearing; 8. Smooth flow guide hole; 9. Flow interception structure; 10. Self-sealing seepage structure; 11. Chamfered end; 12. Self-sealing pin; 13. Seepage hole; 14. Storage chamber; 15. Suction chamber; 16. Oil equalization and cooling component; 17. Baffle; 18. Spring; 19. Damping sleeve; 20. Equalization groove; 21. Storage section. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of the embodiments of this disclosure clearer, the embodiments of this disclosure will be described in more detail below with reference to the accompanying drawings. Note: The described embodiments are only some, not all, of the embodiments of this disclosure. All other embodiments obtained by those skilled in the art based on the described embodiments of this disclosure without creative effort are within the scope of protection of this disclosure.

[0027] As attached Figure 1 To be continued Figure 6As shown in the embodiment of this utility model, a lubrication device for the main shaft support structure of a screw compressor is provided. Existing screw compressors include meshing male and female rotors. After the male rotor is fitted with a rotor, it is cantilevered within the stator of the motor. Lubricating oil is supplied to the male and female rotors through the lubrication oil chamber. During operation, the vaporized condensate in the compressor's internal suction chamber can be discharged through an external suction valve to cool the compressor. To lubricate high-power screw compressors and improve the problem of rotor-stator misalignment when using high-power motors in large-horsepower screw compressors, support can be provided for the cantilevered end of the screw compressor, and this end can be quickly and easily lubricated. First, a stable support seat 6 can be provided inside the motor cover 5 to support the male rotor 2. This stable support seat 6 is located inside the compressor. While supporting the male rotor, the stable support seat 6 also facilitates the rotation of the male rotor, improving the adaptability of high-power motors to screw compressors. Then, a storage cavity 14 is opened on the side near the male rotor 2, and a smooth flow hole 8 is opened in the middle of the stable support 6. The two ends of the smooth flow hole 8 are respectively connected to the lubricating oil cavity 3 and the storage cavity 14, so that the lubricating oil in the lubricating oil cavity can be transported to the storage cavity 14 to lubricate the stable support, thereby providing stable support and lubrication for the cantilever rotor of the screw compressor at the same time.

[0028] It is worth noting that, for example Figure 1 and 2 As shown, in some embodiments, a connecting bearing 7 is provided on the stable support 6 as a rotating connection structure between the stable support 6 and the male rotor. The inner side of the connecting bearing 7 is connected through the male rotor, and the outside of the connecting bearing 7 is connected to the stable support 6. According to the existing connection technology between the motor rotor and the male rotor, the male rotor is rotatably installed in the compressor using ball bearings and roller bearings. The male rotor can synchronously drive the motor rotor to rotate coaxially. The stable support 6 is located between the motor rotor 4 and the male rotor 2, realizing stable support for the cantilever end of the male rotor 2.

[0029] Furthermore, the existing compressor body 1 has a suction chamber 15 for cooling the compressor body 1. In order to facilitate the long-term use of the connecting bearing, the connecting bearing can be selected with a hollow structure. The left and right sides of the connecting bearing 7 can be interconnected, so that the storage chamber 14 is connected to the suction chamber 15 through the connecting bearing 7. When the screw compressor is working, the connecting bearing can also be continuously lubricated by the stable support seat 6. The lubricating oil after use is discharged together with the vapor condensate in the suction chamber through the suction valve to continuously cool the connecting bearing.

[0030] In order to supply the introduced lubricating oil slowly, such as Figure 1As shown, in some embodiments, a small-diameter intercepting structure 9 can be provided inside the stable drainage hole 8 near the lubricating oil cavity 3, and an oil quantity control self-sealing seepage structure 10 can be provided inside the stable drainage hole 8 near the storage cavity 14 to more precisely seal the lubricating oil, so that the lubricating oil can be slowly seeped to the connecting bearing through the self-sealing seepage structure to provide stable lubrication supply to the stable support seat 6.

[0031] And, as Figure 4 and 5 As shown, in some embodiments, the self-sealing seepage structure 10 can use an internal hex bolt. The self-sealing seepage structure includes a bolt body that penetrates through the male rotor 2 and a bolt head disposed at the end. The bolt head is disposed close to the storage cavity. A seepage hole 13 is formed through the middle of the bolt body and the bolt head for conveying lubricating oil. The seepage hole 13 can be sealed by the sleeve of the self-sealing pin 12 inside the seepage hole 13 in the bolt body. The tin bronze material used for the self-sealing pin 12 has good wear resistance and suitable porosity. The amount of lubricating oil seepage is controlled by the gap between the self-sealing pin 12 and the seepage hole 13, thereby improving the oil delivery stability.

[0032] The end of the plug can be provided with a chamfered opening 11. By placing the self-sealing pin 12 close to the chamfered opening 11, the inflow rate is reduced. The self-sealing pin 12 is used to more precisely control the delivery of lubricating oil. Then, the seepage hole 13 is close to the end of the plug head and is drawn inward. The seepage hole 13 is smaller than the inner diameter of the chamfered opening 11, so as to realize the small hole output, balance the high pressure input of the lubricating oil on the left side, and ensure the safety of lubricating oil delivery.

[0033] Furthermore, in order to uniformly deliver oil to the connecting bearing and improve the lubrication effect of the connecting bearing, in some embodiments, an oil equalization and cooling component 16 can be provided inside the storage cavity 14. A gap is left between the oil equalization and cooling component 16 and the male rotor 2 to prevent the oil equalization and cooling component from directly contacting and rubbing against the bearing. The lubricating oil extending from the rotating self-sealing seepage structure can be spun onto the oil equalization and cooling component to uniformly deliver oil to the connecting bearing 7.

[0034] Next, the oil equalization and cooling component 16 includes a damping sleeve 19 connected to the stable support 6. One end of the damping sleeve 19 is provided with a spring 18, and the end of the spring 18 is provided with a baffle 17. The outer end of the baffle 17 is provided with a uniform groove 20 of a hemispherical structure, and the other end of the baffle 17 is provided with a storage part 21 that penetrates through the spring 18. The uniform groove 20 can be used to provide comprehensive lubrication for the connecting bearing, and the storage part 21 stores excess lubricating oil. In some embodiments, the size of the baffle 17 can be the same as the inner diameter of the storage cavity. By using the spring between the baffle 17 and the damping sleeve 19, the balance between the stored lubricating oil and the lubricating oil that has penetrated is increased, so that the oil is evenly applied to the connecting bearing, increasing the integrity and uniformity of the oil film. The cooling can be achieved by circulating and discharging the condensate vapor in the absorption cavity, increasing the sustainability of lubrication and improving the lubrication stability of the support structure.

[0035] Of course, the above description is the preferred embodiment of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this utility model, and these improvements and modifications are also considered to be within the protection scope of this utility model.

Claims

1. A lubrication device for a side main shaft support structure of a screw compressor, comprising a compressor body (1), a motor and a motor rotor (4), wherein the compressor body (1) has a lubricating oil chamber (3) and a male rotor (2) coaxially and rotatably connected to the motor rotor (4), and the motor end is provided with a motor cover (5), characterized in that: The inner side of the motor cover (5) is provided with a stable support seat (6) for supporting the male rotor (2). The stable support seat (6) has a storage cavity (14) on the side close to the male rotor (2). The middle part of the stable support seat (6) has a smooth drainage hole (8) that communicates with the lubricating oil cavity (3) and the storage cavity (14) for stable support and lubrication of the cantilever rotor of the screw compressor.

2. The lubrication device for the main shaft support structure of the screw compressor as described in claim 1, characterized in that, The stable support base (6) is provided with a connecting bearing (7), and the male rotor (2) is connected to the connecting bearing (7) through. The stable support base (6) is located between the motor rotor (4) and the male rotor (2) and is used for stable support of the cantilever end of the male rotor (2).

3. The lubrication device for the main shaft support structure of the screw compressor as described in claim 2, wherein the compressor body (1) has a suction chamber (15) for cooling the compressor body (1), characterized in that, The left and right sides of the connecting bearing (7) are connected, and the storage cavity (14) is connected to the suction cavity (15) through the connecting bearing (7) for the continuous lubrication of the stable support seat (6).

4. The lubrication device for the main shaft support structure of the screw compressor as described in claim 1, characterized in that, The smooth flow hole (8) is provided with a flow interception structure (9) inside the lubricating oil cavity (3), and the smooth flow hole (8) is provided with a self-sealing seepage structure (10) inside the storage cavity (14) for stable lubrication of the support seat (6).

5. The lubrication device for the main shaft support structure of the screw compressor as described in claim 4, characterized in that, The self-sealing seepage structure (10) includes a plug body that penetrates the male rotor (2) and a plug head disposed at the end. A seepage hole (13) is provided in the middle of the plug body and the plug head. A self-sealing pin (12) is sleeved inside the seepage hole (13) in the plug body. The self-sealing pin (12) is made of tin bronze.

6. The lubrication device for the main shaft support structure of the screw compressor as described in claim 5, characterized in that, The end of the plug is provided with a guide angle opening (11), and the self-sealing pin (12) is provided close to the guide angle opening (11). The seepage hole (13) is close to the end of the plug head and is drawn inward. The seepage hole (13) is smaller than the inner diameter of the guide angle opening (11).

7. The lubrication device for the main shaft support structure of the screw compressor as described in claim 6, characterized in that, The storage cavity (14) is provided with an oil equalization and cooling component (16), and there is a gap between the oil equalization and cooling component (16) and the male rotor (2) for connecting the bearing (7) to uniformly deliver oil.

8. The lubrication device for the main shaft support structure of the screw compressor as described in claim 7, characterized in that, The oil equalization and cooling component (16) includes a damping sleeve (19) connected to the stable support base (6). One end of the damping sleeve (19) is provided with a spring (18), and the end of the spring (18) is provided with a baffle (17). The outer end of the baffle (17) is provided with a uniform groove (20) of a hemispherical structure. The other end of the baffle (17) is provided with a storage part (21) that penetrates the spring (18) for connecting the full lubrication of the bearing (7).

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