Roots vacuum pump oil supplementing device

Abstract

The utility model provides a roots vacuum pump oil supplementing device, including gear room, the recessed formation is formed in the vertical hole on the upper portion position of gear room outer surface, the straight screw thread barrel is inserted in the vertical hole, the upper portion position of straight screw thread barrel is equipped with the limit ring of fixed connection with straight screw thread barrel, the upper surface of limit ring is opened with a plurality of positioning hole in annular equidistance, the pressing plate is equipped in straight screw thread barrel, the pressing plate sets up in the upside of limit ring, both ends of pressing plate are connected with gear room through screw, the lower surface middle position of pressing plate is evenly installed with a plurality of positioning head, a plurality of positioning holes are inserted in a plurality of positioning holes respectively, the oil filling mouth bolt is screwed in straight screw thread barrel, the utility model has the beneficial effect that realizes the single replacement of the thread of oil injection part after being damaged, does not need to replace gear room, reduces the replacement cost.

Description

Technical Field

[0001] This utility model is an oil replenishment device for a Roots vacuum pump, belonging to the field of Roots vacuum pumps. Background Technology

[0002] The oil replenishment operation of a Roots vacuum pump is a core maintenance step to ensure stable equipment operation. Its proper execution directly affects the pump's lubrication effect, sealing performance, and overall service life. During long-term continuous operation, abnormal oil loss can occur in the gearbox of a Roots vacuum pump. The continuous negative pressure environment created during pump operation exerts a stable adsorption force on the lubricating oil within the gearbox. Over time, sealing components such as shaft seals and bearing oil retainers gradually age, reducing their sealing performance and causing micro-gaps. Under the combined effect of negative pressure and these gaps, some lubricating oil is slowly drawn into the pump chamber through these micro-channels, either being carried out during the exhaust process or forming oil mist residue within the pump chamber, ultimately leading to a gradual decrease in the gearbox oil level.

[0003] To solve this problem, oil needs to be replenished through the oil filling hole on the surface of the gear chamber, which is usually threaded with an oil filling plug. However, each time oil is replenished, the oil filling plug needs to be repeatedly removed and installed. During frequent operation, the threads inside the oil filling hole are easily damaged due to misalignment, impact, or other reasons. Once the threads are damaged, the oil filling hole will not be able to seal effectively, which will not only lead to lubricating oil leakage but may also introduce impurities to contaminate the oil. In this case, the entire gear chamber often needs to be replaced, resulting in a significant increase in the cost of replacing parts, becoming a major burden in equipment maintenance. Utility Model Content

[0004] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a Roots vacuum pump oil replenishment device to solve the problems mentioned in the background technology. This utility model enables the oil filling part to be replaced separately after the thread is damaged, without the need to replace the gear chamber, thus reducing the replacement cost.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a Roots vacuum pump oil replenishment device, comprising: The gear chamber has a vertical hole formed by a recess in the upper part of its outer surface; A straight threaded cylinder is inserted into a vertical hole. A limiting ring is fitted inside the upper part of the straight threaded cylinder and is connected and fixed to the straight threaded cylinder. The upper surface of the limiting ring is provided with multiple positioning holes at equal intervals in an annular shape. A pressure plate is fitted onto a straight threaded cylinder. The pressure plate is positioned on the upper side of a limiting ring. Both ends of the pressure plate are connected to the gear chamber via screws. Multiple positioning heads are evenly installed in the middle of the lower surface of the pressure plate, and multiple positioning holes are respectively inserted into multiple positioning holes. The filler cap bolt has its threaded connection inside the straight threaded cylinder.

[0006] Furthermore, two frustums are installed on the upper part of the outer surface of the gearbox. Threaded holes are formed on the upper surface of the frustums. Small holes are formed at both ends of the pressure plate. The screw passes through the small holes and is threaded into the threaded holes.

[0007] Furthermore, a lower sealing ring is provided on the lower side of the limiting ring, the lower sealing ring is sleeved on the straight threaded cylinder, and the lower sealing ring is in contact with the gear chamber.

[0008] Furthermore, an upper sealing ring is provided between the straight threaded cylinder and the pressure plate. The outer diameter of the upper sealing ring is the same as the outer diameter of the straight threaded cylinder, and the inner diameter of the upper sealing ring is the same as the inner diameter of the straight threaded cylinder. The oil filler bolt passes through the upper sealing ring.

[0009] Furthermore, the limiting ring and the straight threaded cylinder are integrally formed, and the outer diameter of the straight threaded cylinder is the same as the inner diameter of the vertical hole.

[0010] Furthermore, a rotor chamber is installed on one side of the gear chamber, and a motor for driving the gears inside the gear chamber to rotate is installed on the side of the gear chamber facing away from the rotor chamber.

[0011] Furthermore, an oil level observation window is installed on one side of the gear chamber, and the oil level observation window is located on the side of the gear chamber away from the rotor chamber.

[0012] Furthermore, an air inlet is installed at the upper part of the outer surface of the rotor, and an exhaust port is installed at the lower part of the outer surface of the rotor.

[0013] The beneficial effects of this utility model are: 1. Transfer the oil filling hole thread on the original gear chamber to an independent straight thread cylinder, and connect the oil filling port bolt directly to the thread of the straight thread cylinder. When frequent oil replenishment causes thread wear, there is no need to replace the entire gear chamber; only the straight thread cylinder needs to be replaced, significantly reducing parts replacement costs.

[0014] 2. The straight threaded cylinder is fixed to the gear chamber by a pressure plate. When disassembling, the old straight threaded cylinder can be removed simply by unscrewing the screws. This shortens the time required to replace the new part and reduces downtime for maintenance. At the same time, it allows the screws to form a threaded connection with the frustum, thereby increasing the thickness of the screw mounting area in the gear chamber.

[0015] 3. The limiting ring of the straight threaded cylinder is equipped with a positioning hole, which cooperates with the positioning head on the lower surface of the pressure plate to form circumferential positioning, preventing the straight threaded cylinder from rotating during equipment operation or disassembly and ensuring stable threaded connection. At the same time, the limiting ring fits tightly against the inner wall of the vertical hole, controlling radial wobble and preventing oil leakage. Attached Figure Description

[0016] Other features, objects, and advantages of this invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings: Figure 1 This is a schematic diagram of the structure of a Roots vacuum pump oil replenishment device according to the present invention; Figure 2 This is a perspective view of a Roots vacuum pump oil replenishment device according to the present invention. Figure 3 This is a partial exploded view of a Roots vacuum pump oil replenishment device according to this utility model; Figure 4 for Figure 3 Enlarged view of point A in the middle; Figure 5 This is a schematic diagram of the assembly of the positioning head and the pressure plate in a Roots vacuum pump oil replenishment device according to the present invention; In the picture: 1. Gear chamber; 11. Oil level observation window; 12. Frustum; 13. Vertical hole; 2. Electric motor; 3. Screws; 4. Pressure plate; 41. Small hole; 42. Positioning head; 5. Filler cap bolt; 51. Upper sealing ring; 52. Limiting ring; 53. Positioning hole; 54. Straight threaded cylinder; 55. Lower sealing ring; 6. Rotor chamber; 61. Air inlet; 62. Exhaust outlet. Detailed Implementation

[0017] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0018] Please see Figure 1 and Figure 2 This utility model provides a technical solution: a Roots vacuum pump oil replenishment device, including a gear chamber 1, a rotor chamber 6 installed on one side of the gear chamber 1, an air inlet 61 installed at the upper position of the outer surface of the rotor chamber 6, an exhaust port 62 installed at the lower position of the outer surface of the rotor chamber 6, a motor 2 for driving the gears inside the gear chamber 1 to rotate is installed on the side of the gear chamber 1 away from the rotor chamber 6, and an oil level observation window 11 is installed on one side of the gear chamber 1. The oil level observation window 11 on the gear chamber 1 can directly observe the oil level. Combined with the convenience of the oil replenishment device, it is easy for operators to detect abnormal oil levels in time and replenish oil, avoiding wear of gears and bearings due to insufficient lubrication.

[0019] See Figures 1-5A vertical hole 13 is formed by a recess at the upper part of the outer surface of the gear chamber 1. A straight threaded cylinder 54 is inserted into the vertical hole 13. The outer diameter of the straight threaded cylinder 54 is the same as the inner diameter of the vertical hole 13. A limiting ring 52 is fitted inside the upper part of the straight threaded cylinder 54 and is fixed to the straight threaded cylinder 54. The limiting ring 52 and the straight threaded cylinder 54 are integrally formed. A pressure plate 4 is fitted on the straight threaded cylinder 54 and is located on the upper side of the limiting ring 52. Both ends of the pressure plate 4 are connected to the gear chamber 1 by screws 3. The oil filler bolt 5 is threadedly connected to the straight threaded cylinder 54. The oil filler hole thread that was originally directly machined on the gear chamber 1 is now undertaken by the independent straight threaded cylinder 54. The straight threaded cylinder 54 is inserted into the vertical hole 13 of the gear chamber 1, and the threaded connection object of the oil filler bolt 5 becomes this independent straight threaded cylinder 54. In this way, even if the threads on the straight threaded cylinder 54 become stripped or misaligned due to wear during frequent oil replenishment and repeated disassembly and reassembly of the oil filler cap bolt 5, it is not necessary to replace the entire gear chamber 1. Only the damaged straight threaded cylinder 54 needs to be removed and replaced separately. This design completely avoids the high cost problem of replacing the entire gear chamber 1 due to partial thread damage in traditional structures, and significantly reduces the replacement expenses of parts.

[0020] See Figures 3-5 The upper surface of the limiting ring 52 has multiple equidistant positioning holes 53 arranged in a ring. Multiple positioning heads 42 are evenly installed at the center of the lower surface of the pressure plate 4, and each positioning head 42 is inserted into one of the positioning holes 53. Two frustums 12 are installed at the upper part of the outer surface of the gear chamber 1. Threaded holes are formed on the upper surface of each frustum 12. Small holes 41 are formed at both ends of the pressure plate 4. Screws 3 pass through the small holes 41 and are threaded into the threaded holes. The straight threaded cylinder 54 is fixed to the gear chamber 1 by means of the pressure plate 4—the pressure plate 4 is fitted onto the straight threaded cylinder 54, and both ends are connected to the gear chamber 1 by screws 3. When the straight threaded cylinder 54 needs to be replaced, simply unscrew the screws 3 at both ends of the pressure plate 4 to easily remove the old straight threaded cylinder 54. The entire replacement process is significantly shortened, effectively reducing equipment downtime for maintenance. Simultaneously, two frustums 12 are installed at corresponding positions in the gear chamber 1. After the screws 3 pass through the small holes 41 on the pressure plate 4, they directly form a threaded connection with the threaded holes on the frustums 12. This frustum 12 design locally increases the thickness of the area where the screw 3 is installed on the gear chamber 1, enhancing the structural strength of this connection and ensuring the stability of the screw 3's fixation. The limiting ring 52 of the straight threaded cylinder 54 has a positioning hole 53, which precisely engages with the positioning head 42 on the lower surface of the pressure plate 4. This structure provides circumferential positioning for the straight threaded cylinder 54, effectively preventing rotation during equipment operation or disassembly / reassembly, thus ensuring the stability of the threaded connection between the oil filler bolt 5 and the straight threaded cylinder 54. Furthermore, the limiting ring 52 fits tightly against the inner wall of the vertical hole 13 on the gear chamber 1, strictly controlling the radial wobble of the straight threaded cylinder 54 and structurally preventing oil leakage.

[0021] See Figure 3 and Figure 4 A lower sealing ring 55 is provided on the lower side of the limiting ring 52. The lower sealing ring 55 is sleeved on the straight threaded cylinder 54 and fits against the gear chamber 1. An upper sealing ring 51 is provided between the straight threaded cylinder 54 and the pressure plate 4. The outer diameter of the upper sealing ring 51 is the same as the outer diameter of the straight threaded cylinder 54, and the inner diameter of the upper sealing ring 51 is the same as the inner diameter of the straight threaded cylinder 54. The oil filler bolt 5 passes through the upper sealing ring 51. The lower sealing ring 55 on the lower side of the limiting ring 52 fits tightly against the surface of the gear chamber 1, and the upper sealing ring 51 between the straight threaded cylinder 54 and the pressure plate 4 forms a secondary seal. The two sealing structures can completely prevent oil leakage and the intrusion of external impurities, reduce the oil contamination rate, and ensure the cleanliness of the lubricating oil.

[0022] Although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A Roots vacuum pump oil replenishment device, characterized in that, include: The gear chamber (1) has a vertical hole (13) formed by a recess at the upper part of its outer surface. A straight threaded cylinder (54) is inserted into a vertical hole (13). A limiting ring (52) is fitted inside the upper part of the straight threaded cylinder (54) and is connected and fixed to the straight threaded cylinder (54). Multiple positioning holes (53) are opened in an annular shape on the upper surface of the limiting ring (52). A pressure plate (4) is sleeved on a straight threaded cylinder (54). The pressure plate (4) is set on the upper side of the limiting ring (52). Both ends of the pressure plate (4) are connected to the gear chamber (1) by screws (3). Multiple positioning heads (42) are evenly installed in the middle of the lower surface of the pressure plate (4). The multiple positioning heads (42) are respectively inserted into multiple positioning holes (53). The oil filler bolt (5) is threaded inside the straight threaded cylinder (54).

2. The oil replenishment device for a Roots vacuum pump according to claim 1, characterized in that: Two frustums (12) are installed on the upper part of the outer surface of the gear chamber (1). The frustums (12) have threaded holes on their upper surfaces. The pressure plate (4) has small holes (41) at both ends. The screw (3) passes through the small holes (41) and is threaded into the threaded holes.

3. The oil replenishment device for a Roots vacuum pump according to claim 1, characterized in that: The lower side of the limiting ring (52) is provided with a lower sealing ring (55), which is sleeved on the straight threaded cylinder (54) and fits against the gear chamber (1).

4. The oil replenishment device for a Roots vacuum pump according to claim 1, characterized in that: An upper sealing ring (51) is provided between the straight threaded cylinder (54) and the pressure plate (4). The outer diameter of the upper sealing ring (51) is the same as the outer diameter of the straight threaded cylinder (54), and the inner diameter of the upper sealing ring (51) is the same as the inner diameter of the straight threaded cylinder (54). The oil filler bolt (5) passes through the upper sealing ring (51).

5. The oil replenishment device for a Roots vacuum pump according to claim 1, characterized in that: The limiting ring (52) and the straight threaded cylinder (54) are integrally formed, and the outer diameter of the straight threaded cylinder (54) is the same as the inner diameter of the vertical hole (13).

6. The oil replenishment device for a Roots vacuum pump according to claim 1, characterized in that: The gear chamber (1) has a rotor chamber (6) installed on one side, and a motor (2) for driving the gears inside the gear chamber (1) to rotate is installed on the side of the gear chamber (1) away from the rotor chamber (6).

7. The oil replenishment device for a Roots vacuum pump according to claim 6, characterized in that: An oil level observation window (11) is installed on one side of the gear chamber (1), and the oil level observation window (11) is located on the side of the gear chamber (1) away from the rotor chamber (6).

8. The oil replenishment device for a Roots vacuum pump according to claim 6, characterized in that: An air inlet (61) is installed on the upper part of the outer surface of the rotor chamber (6), and an exhaust port (62) is installed on the lower part of the outer surface of the rotor chamber (6).

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