A screw compressor screw

Abstract

The present application aims to provide a screw rod of screw compressor, comprising a screw rod body, a shaft, an outer bearing, an inner bearing, a sleeve, and an elastic torsion assembly; both ends of the screw rod body are respectively provided with a shaft, both sides of each group of shafts are respectively provided with an outer bearing and an inner bearing, a sleeve is arranged on the shaft between the outer bearing and the inner bearing, and the sleeve can slide relative to the shaft; the shaft is of a hollow structure, and the shaft is respectively provided with an inner oil hole near the outer bearing and the inner bearing; the sleeve is provided with an outer oil hole corresponding to the inner oil hole; the sleeve is provided with the elastic torsion assembly, the outer oil hole and the inner oil hole are misaligned under the action of the elastic torsion assembly in a natural state; and the elastic torsion assembly is in sliding contact with the inner wall of the bearing seat through friction. The present application can timely lubricate the bearings and other components in the bearing seat, realize long-term self-lubrication protection of the shaft part, and prolong the service life of the screw rod.

Description

Technical Field

[0001] This invention relates to the field of screw compressor technology, and more specifically to a screw compressor screw. Background Technology

[0002] Screw compressors, due to their simple structure, few vulnerable parts, ability to operate under large pressure differences or pressure ratios with low discharge temperatures, insensitivity to refrigerants containing large amounts of lubricating oil, and good gas delivery capacity regulation, quickly occupied the application range of large-capacity reciprocating compressors and are widely used in refrigeration equipment such as refrigeration, cold storage, air conditioning, and chemical processes.

[0003] Screw compressors generate compression force through the rotation of male and female screws. The most common failure of screw compressors is caused by friction. The screw shaft is supported by bearings, which lack long-term self-lubrication, making it easy to damage the screw shaft and bearings. Summary of the Invention

[0004] The present invention aims to provide a screw compressor screw that can lubricate the bearings and other components in the bearing housing in a timely manner, thereby achieving long-term autonomous lubrication protection of the shaft and extending the service life of the screw.

[0005] The screw of the screw compressor includes a screw body, a shaft, an outer bearing, an inner bearing, a sleeve, and an elastic torsion assembly; The screw body has shafts at both ends, and each shaft has an outer bearing and an inner bearing on both sides. A sleeve is provided on the shaft between the outer bearing and the inner bearing, and the sleeve can slide relative to the shaft. The shaft has a hollow internal structure, with internal oil holes near the outer and inner bearings respectively. The sleeve has an external oil hole corresponding to the internal oil hole. The sleeve is equipped with an elastic torsion assembly. In its natural state, under the action of the elastic torsion assembly, the external oil hole and the internal oil hole are misaligned. The elastic torsion assembly slides in contact with the inner wall of the bearing seat through friction. When the friction force is greater than the elastic force of the elastic torsion assembly, the sleeve rotates, and the external oil hole aligns with the internal oil hole.

[0006] The elastic torsion assembly includes a ring, a friction assembly, a plug, a stop, and a spring I; The ring body is fitted onto the middle of the shaft and can slide relative to the shaft; the sleeve is provided in two sets, located on both sides of the ring body, and is fixedly connected to the ring body respectively; The ring body is provided with a slot, and the shaft is provided with a retaining groove corresponding to the position of the ring body, with the top of the retaining groove communicating with the slot; The plug body is inserted into the slot and fixedly connected to the ring body. The bottom of the plug body is provided with a stop block. The stop block is inserted into the stop groove. A spring I is provided between the stop block and the inner wall of the stop groove located on the rear side of the rotation direction. In the natural state, under the action of the elastic force of the spring I, the outer oil hole and the inner oil hole are misaligned. The friction assembly is installed on the outer side of the plug body and contacts the inner wall of the bearing seat through friction. When the friction force is greater than the elastic force of spring I, the sleeve rotates and the outer oil hole aligns with the inner oil hole.

[0007] The combined structure of the slot, the stop groove, the plug body, the stop block, and the spring I is provided in two or more sets, and is evenly spaced along the circumferential direction.

[0008] The ring body is provided with a mounting recess next to the slot, and the top side of the plug body is provided with an extension. The extension is placed on the mounting recess and connected by screws. At this time, the top surface of the extension is flush with the outer circular surface of the ring body.

[0009] The friction assembly includes a friction plate, a sliding column, a baffle, a spring II, and a stud. The top of the plug body has a telescopic cavity, the baffle is located in the telescopic cavity, and the sliding column can be slidably assembled in the telescopic cavity. The friction plate is installed on the top of the sliding column, and the top surface of the friction plate slides in contact with the inner wall of the bearing seat. The two ends of the spring II are respectively connected to the bottom surface of the telescopic cavity and the bottom of the baffle. The baffle is provided with a threaded hole I in the middle. The top of the friction plate is provided with a groove, and a through hole is provided in the groove to penetrate the lower end of the sliding column. The stud passes through the through hole and is screwed into the threaded hole I through threaded engagement.

[0010] The sleeves on both sides of the ring body are provided with external oil ports, and the shaft is provided with internal oil ports at corresponding positions. The external oil ports are longer in the circumferential direction, and the external oil ports and internal oil ports are connected regardless of whether the ring body and sleeves rotate.

[0011] It also includes oil guiding spiral blades. The sleeves on both sides of the ring body are respectively provided with oil guiding spiral blades with opposite spiral directions. The inlet of the oil guiding spiral blade corresponds to the outer bearing or the inner bearing, and the outlet corresponds to the outer oil port. The oil guiding spiral blades guide the sludge at the outer bearing or the inner bearing to the outer oil port.

[0012] The screw of the screw compressor also includes a threaded cap, a connecting rod, and a filter screen; The cavity inside the shaft corresponds to the inner oil holes on both sides of the ring body and is a frustum-shaped cavity. The top surfaces of these two frustum-shaped cavities are positioned opposite each other, and the bottom surface of the frustum-shaped cavity is connected to the inner oil hole. The remaining cavities are cylindrical cavities, and the diameter of the cylindrical cavity is equal to the diameter of the top surface of the frustum-shaped cavity. The opening of the cylindrical cavity on the outer end face of the shaft is a threaded opening. The threaded cap is screwed into the threaded opening through a threaded fit. The inner side of the threaded cap is provided with a connecting rod, which is arranged along the shaft axis. Two sets of filter screens are fixedly arranged on the connecting rod at intervals, and the two sets of filter screens are respectively located at the top surface of the frustum-shaped cavity.

[0013] The screw of the screw compressor also includes a retaining ring, which is located on the side of the filter screen near the ring body and is fixedly connected to the filter screen. The outer circular surface of the retaining ring is in clearance fit with the cylindrical cavity, and the inner circular surface of the retaining ring is provided with several rings, which are inclined upwards to both sides of the retaining ring.

[0014] The working process of this invention is as follows: When the screw body rotates, the ring and sleeve rotate with the shaft. The friction assembly contacts the inner wall of the bearing housing. When the lubrication conditions inside the bearing housing decrease, the friction between the friction assembly and the inner cavity of the bearing housing increases. This causes the ring, sleeve, and shaft to gradually overcome the spring force of spring I and undergo axial torsion during rotation, aligning the outer oil hole with the inner oil hole. The lubricant is then introduced into the bearing housing through the inner and outer oil holes to lubricate the bearing and friction assembly parts. After the lubrication conditions are restored, the friction of the friction assembly decreases, and the spring force causes the sleeve and shaft to torsion reset, sealing the inner oil hole and preventing the continuous discharge of lubricant.

[0015] Long-term operation of the screw body will cause sludge and other impurities to accumulate in the bearing housing. During the rotation of the shaft, the sleeve drives the spiral blades to rotate, which conducts the excess sludge and impurities in the bearing housing towards the ring. The sludge and impurities, as well as the excess lubricating fluid, will be introduced into the oil cavity through the outer and inner oil ports. The lubricating oil will carry the sludge and impurities to the larger diameter frustum-shaped cavity. The sludge and impurities are filtered by the filter screen, and the lubricating oil accumulates in the frustum-shaped cavity. The sludge and impurities are blocked and hidden in the ring. The threaded cover should be removed regularly, the retaining ring should be pulled out, and the surface of the filter screen and the sludge and impurities blocked by the ring should be cleaned.

[0016] The beneficial effects of this invention are as follows: This invention stores lubricant in the cavity inside the shaft and feeds back the friction force in the bearing housing through a friction component that rotates with the shaft. When the lubrication environment deteriorates, the friction force causes the friction component to drive the sleeve and shaft to twist, aligning the outer oil hole with the inner oil hole to discharge the lubricant. This timely lubrication of the bearing housing provides long-term autonomous lubrication protection for the shaft and extends the service life of the screw.

[0017] The invention also features a unique sludge filtration structure that enables the reuse of lubricating oil within the shaft cavity, facilitating cleaning and further enhancing ease of use and durability. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the screw of a screw compressor as shown in the embodiment. Figure 2This is a schematic diagram of the shaft and its mounting structure on one side of the embodiment; Figure 3 This is a cross-sectional view of the shaft and its mounting structure on one side of the embodiment. Figure 4 This is a cross-sectional view of the mounting structure of the ring body in the embodiment; Figure 5 This is a cross-sectional view of the connector in the embodiment; Figure 6 This is a schematic diagram of the structure of the retaining ring and filter screen in the embodiment; Figure 7 Half-sectional view of the retaining ring and filter screen in the embodiment The numbers and names in the diagram are as follows: 1-Screw body, 2-Bearing seat, 3-Shaft, 4-Outer bearing, 5-Inner bearing, 6-Sleeve, 7-Inner oil hole, 8-Outer oil hole, 9-Ring body, 10-Plug-in body, 11-Stop block, 12-Spring I, 13-Slot, 14-Stop groove, 15-Mounting recess, 16-Extension, 17-Friction plate, 18-Sliding column, 19-Stop plate, 20-Spring II, 21-Screw, 22-Telescopic cavity, 23-Sink, 24-Outer oil port, 25-Inner oil port, 26-Threaded cap, 27-Connecting rod, 28-Filter screen, 29-Sticking ring, 30-Ring, 31-Oil guide spiral, 32-Frustoconical cavity, 33-Cylindrical cavity. Detailed Implementation

[0019] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0020] Example 1

[0021] like Figure 1-7 As shown, the screw of the screw compressor includes a screw body 1, a shaft 3, an outer bearing 4, an inner bearing 5, a sleeve 6, and an elastic torsion assembly; The screw body 1 has shafts 3 at both ends. Each shaft 3 has an outer bearing 4 and an inner bearing 5 on both sides. A sleeve 6 is provided on the shaft 3 between the outer bearing 4 and the inner bearing 5. The sleeve 6 can slide relative to the shaft 3. The shaft 3 has a hollow internal structure. The shaft 3 has internal oil holes 7 near the outer bearing 4 and the inner bearing 5, respectively. The sleeve 6 has an external oil hole 8 corresponding to the internal oil hole 7. The sleeve 6 is equipped with an elastic torsion assembly. In its natural state, under the action of the elastic torsion assembly, the external oil hole 8 is misaligned with the internal oil hole 7. The elastic torsion assembly slides in contact with the inner wall of the bearing seat 2 through friction. When the friction force is greater than the elastic force of the elastic torsion assembly, the sleeve 6 rotates, and the external oil hole 8 aligns with the internal oil hole 7.

[0022] The elastic torsion assembly includes a ring 9, a friction assembly, a plug 10, a stop 11, and a spring I 12; The ring 9 is fitted onto the middle of the shaft 3 and can slide relative to the shaft 3; the sleeve 6 is provided in two sets, located on both sides of the ring 9, and is fixedly connected to the ring 9 respectively; The ring body 9 is provided with a slot 13, and the shaft 3 is provided with a stop groove 14 corresponding to the position of the ring body 9. The top of the stop groove 14 is connected to the slot 13. The plug body 10 is inserted into the slot 13 and fixedly connected to the ring body 9. The bottom of the plug body 10 is provided with a stop block 11. The stop block 11 is inserted into the stop groove 14. A spring I 12 is provided between the stop block 11 and the inner wall of the stop groove 14 located on the rear side of the rotation direction. In the natural state, under the elastic force of the spring I 12, the outer oil hole 8 and the inner oil hole 7 are misaligned. The friction assembly is installed on the outer side of the plug body 10 and contacts the inner wall of the bearing seat 2 through friction. When the friction force is greater than the elastic force of the spring I12, the sleeve 6 rotates and the outer oil hole 8 aligns with the inner oil hole 7.

[0023] The combined structure of the slot 13, the stop groove 14, the plug body 10, the stop block 11, and the spring I 12 is provided in two or more sets, and is evenly spaced along the circumferential direction.

[0024] The ring body 9 is provided with a mounting recess 15 next to the slot 13. The top side of the plug body 10 is provided with an extension 16. The extension 16 is placed on the mounting recess 15 and connected by screws. At this time, the top surface of the extension 16 is flush with the outer circular surface of the ring body 9.

[0025] The friction assembly includes a friction plate 17, a sliding column 18, a baffle 19, a spring 20, and a stud 21. The top of the plug body 10 has a telescopic cavity 22, the baffle 19 is disposed in the telescopic cavity 22, and the sliding column 18 can be slidably assembled in the telescopic cavity 22. The friction plate 17 is installed on the top of the sliding column 18, and the top surface of the friction plate 17 slides in contact with the inner wall of the bearing seat 2. The two ends of the spring II 20 are respectively connected to the bottom surface of the telescopic cavity 22 and the bottom of the baffle 19. The baffle 19 has a threaded hole I in the middle. The top of the friction plate 17 has a groove 23, and the groove 23 has a through hole that passes through the lower end of the sliding column 18. The stud 21 passes through the through hole and is screwed into the threaded hole I through thread engagement.

[0026] The sleeves 6 on both sides of the ring body 9 are respectively provided with external oil ports 24, and the shaft 3 is provided with internal oil ports 25 at the corresponding positions. The external oil ports 24 are longer in the circumferential direction, and the external oil ports 24 and internal oil ports 25 are connected regardless of whether the ring body 9 and the sleeves 6 rotate.

[0027] The sleeves 6 on both sides of the ring body 9 are respectively provided with oil guiding spiral blades 31 with opposite spiral directions. The inlet of the oil guiding spiral blade 31 corresponds to the outer bearing 4 or the inner bearing 5, and the outlet corresponds to the outer oil port 24. The oil guiding spiral blade 31 guides the sludge at the outer bearing 4 or the inner bearing 5 to the outer oil port 24.

[0028] The cavity inside the shaft 3 corresponds to the inner oil holes 7 on both sides of the ring 9 and is a frustum-shaped cavity 32. The top surfaces of these two frustum-shaped cavities 32 are arranged opposite each other, and the bottom surface of the frustum-shaped cavity 32 is connected to the inner oil hole 7. The remaining cavity is a cylindrical cavity 33. The diameter of the cylindrical cavity 33 is equal to the diameter of the top surface of the frustum-shaped cavity. The opening of the cylindrical cavity on the outer end face of the shaft 3 is a threaded opening. The threaded cap 26 is screwed into the threaded opening through a threaded fit. The inner side of the threaded cap 26 is provided with a connecting rod 27, which is axially arranged along the shaft 3. Two sets of filter screens 28 are fixedly arranged on it at intervals. The two sets of filter screens 28 are respectively located on the top surface of the frustum-shaped cavity 32.

[0029] The screw of the screw compressor also includes a retaining ring 29. The retaining ring 29 is located on the side of the filter screen 28 near the ring body 9 and is fixedly connected to the filter screen 28. The outer circular surface of the retaining ring 29 is in clearance fit with the cylindrical cavity. A plurality of rings 30 are provided on the inner circular surface of the retaining ring 29. The rings 30 are inclined upwards to both sides of the retaining ring 29.

Claims

1. A screw compressor screw, comprising a screw body (1), a shaft (3), an outer bearing (4), an inner bearing (5), a sleeve (6), and an elastic torsion assembly; characterized in that: The screw body (1) has shafts (3) at both ends. Each shaft (3) has an outer bearing (4) and an inner bearing (5) on both sides. A sleeve (6) is provided on the shaft (3) between the outer bearing (4) and the inner bearing (5). The sleeve (6) can slide relative to the shaft (3). The shaft (3) has a hollow structure inside. The shaft (3) is provided with an inner oil hole (7) near the outer bearing (4) and the inner bearing (5). The sleeve (6) is provided with an outer oil hole (8) corresponding to the inner oil hole (7). The sleeve (6) is provided with an elastic torsion assembly. In its natural state, under the action of the elastic torsion assembly, the outer oil hole (8) and the inner oil hole (7) are misaligned. The elastic torsion assembly slides in contact with the inner wall of the bearing seat (2) through friction. When the friction force is greater than the elastic force of the elastic torsion assembly, the sleeve (6) rotates and the outer oil hole (8) aligns with the inner oil hole (7). The elastic torsion assembly includes a ring (9), a friction assembly, a plug (10), a stop (11), and a spring I (12). The ring (9) is fitted in the middle of the shaft (3) and can slide relative to the shaft (3); the sleeve (6) is provided in two sets, located on both sides of the ring (9) and fixedly connected to the ring (9) respectively; The ring (9) is provided with a slot (13), and the shaft (3) is provided with a stop groove (14) corresponding to the position of the ring (9). The top of the stop groove (14) is connected to the slot (13). The plug body (10) is inserted into the slot (13) and fixedly connected to the ring body (9). The bottom of the plug body (10) is provided with a stop block (11). The stop block (11) is inserted into the stop groove (14). A spring I (12) is provided between the stop block (11) and the inner wall of the stop groove (14) located on the rear side of the rotation direction. In the natural state, under the elastic force of the spring I (12), the outer oil hole (8) and the inner oil hole (7) are misaligned. The friction assembly is installed on the outer side of the plug body (10) and contacts the inner wall of the bearing seat (2) through friction. When the friction force is greater than the elastic force of spring I (12), the sleeve (6) rotates and the outer oil hole (8) aligns with the inner oil hole (7). The friction assembly includes a friction plate (17), a sliding column (18), a baffle (19), a spring II (20), and a stud (21). The top of the plug body (10) is provided with a telescopic cavity (22). The baffle (19) is located in the telescopic cavity (22). The sliding column (18) can be slidably assembled in the telescopic cavity (22). The friction plate (17) is installed on the top of the sliding column (18), and the top surface of the friction plate (17) slides in contact with the inner wall of the bearing seat (2). The two ends of the spring II (20) are respectively connected to the bottom surface of the telescopic cavity (22) and the bottom of the baffle (19). The baffle (19) has a threaded hole I in the middle. The friction plate (17) has a groove (23) at the top. The groove (23) has a through hole that passes through the lower end of the sliding column (18). The stud (21) passes through the through hole and is screwed into the threaded hole I through the threaded engagement. Lubricating fluid is introduced into the bearing housing (2) through the inner oil hole (7) and the outer oil hole (8) to lubricate the bearing part and the friction component part. After the lubrication conditions are restored, the friction of the friction component is reduced, and the elastic force causes the sleeve (6) and the shaft (3) to twist and reset. The inner oil hole (7) is blocked to prevent the lubricating fluid from being continuously discharged.

2. The screw of the screw compressor as described in claim 1, characterized in that: The combination structure of the slot (13), the stop groove (14), the plug body (10), the stop block (11), and the spring I (12) is provided in two or more sets, and is evenly spaced along the circumferential direction.

3. The screw of the screw compressor as described in claim 1, characterized in that: The ring (9) is provided with a mounting recess (15) next to the slot (13). The plug body (10) has an extension (16) on one side of its top. The extension (16) is placed on the mounting recess (15) and connected by screws. At this time, the top surface of the extension (16) is flush with the outer circle surface of the ring (9).

4. The screw of the screw compressor as described in claim 1, characterized in that: The sleeves (6) on both sides of the ring (9) are provided with external oil ports (24) respectively, and the shaft (3) is provided with internal oil ports (25) at the corresponding positions. The external oil ports (24) are longer in the circumferential direction. Regardless of whether the ring (9) and the sleeves (6) rotate, the external oil ports (24) and the internal oil ports (25) are connected.

5. The screw of the screw compressor as described in claim 4, characterized in that: It also includes an oil guide spiral blade (31). The sleeves (6) on both sides of the ring body (9) are respectively provided with oil guide spiral blades (31) with opposite spiral directions. The inlet of the oil guide spiral blade (31) corresponds to the outer bearing (4) or the inner bearing (5), and the outlet corresponds to the outer oil port (24). The oil guide spiral blade (31) guides the sludge at the outer bearing (4) or the inner bearing (5) to the outer oil port (24).

6. The screw of the screw compressor as described in claim 4, characterized in that: It also includes a threaded cap (26), a connecting rod (27), and a filter screen (28); The cavity inside the shaft (3) is a frustum-shaped cavity (32) corresponding to the inner oil holes (7) on both sides of the ring (9). The top surfaces of these two frustum-shaped cavities (32) are arranged opposite each other, and the bottom surface of the frustum-shaped cavity (32) is connected to the inner oil hole (7). The remaining cavity is a cylindrical cavity (33). The diameter of the cylindrical cavity (33) is equal to the diameter of the top surface of the frustum-shaped cavity. The opening of the cylindrical cavity on the outer end face of the shaft (3) is a threaded opening. The threaded cap (26) is screwed into the threaded opening through threaded engagement. The inner side of the threaded cap (26) is provided with a connecting rod (27). The connecting rod (27) is axially arranged along the shaft (3). Two sets of filter screens (28) are fixedly arranged on it at intervals. The two sets of filter screens (28) are respectively located at the top surface of the frustum-shaped cavity (32).

7. The screw of the screw compressor as described in claim 6, characterized in that: It also includes a retaining ring (29), which is located on the side of the filter screen (28) near the ring body (9) and is fixedly connected to the filter screen (28). The outer circular surface of the retaining ring (29) is in clearance fit with the cylindrical cavity. Several rings (30) are provided on the inner circular surface of the retaining ring (29). The rings (30) are inclined upwards to both sides by the retaining ring (29).

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