Gas-oil separation dry type sucking pump

By designing an air-oil separation structure and maintenance-free bearings in the dry vacuum pump, the heat dissipation and sealing problems are solved, efficient vacuum pump operation is achieved, maintenance costs are reduced, and the purity of the pumped gas is ensured.

CN223398875UActive Publication Date: 2025-09-30GUANGDONG KENFLO PUMP CO LTD
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Patent Information

Application Number
CN202422962503.9
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-12-02
Publication Date
2025-09-30
Estimated Expiration
2034-12-02

AI Technical Summary

Technical Problem

In existing dry vacuum pumps, the heat dissipation effect of synchronous gears, bearings and shaft seal components is poor, the sealing is poor, the lubricating oil is easy to leak, and the water cooling coil is prone to blockage or leakage, resulting in high-temperature expansion and seizure of parts, wear and lubricating oil emulsification.

Method used

A dry vacuum pump with air-oil separation is designed. By setting a rotor and sealing structure in the pump body, the air circuit and the oil circuit are completely separated. Maintenance-free bearings and oil seals are adopted, the shaft seal components are eliminated, and hollow interlayer water cooling is used to ensure the independence and sealing of the air circuit and the oil circuit.

Benefits of technology

It achieves efficient heat dissipation and sealing of the vacuum pump, avoids high-temperature expansion and seizure of parts and leakage of lubricating oil, improves product operation reliability and reduces maintenance costs, ensures that the sucked gas is not contaminated by oil and gas, and simplifies maintenance difficulty.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model belongs to the technical field of dry type sucking pumps, in particular to a gas-oil separation dry type sucking pump, which is characterized in that a pair of rotors is arranged in a pump body, two ends of each rotor are sealed by a driving end side cover and a non-driving end side cover, a shaft of each rotor and the driving end side cover are sealed by a shaft seal component, and the non-driving end side cover is sealed by a rear end cover; the synchronous gear, the first bearing, the second bearing and the third bearing are arranged on a shaft of the rotor, the shaft of the rotor and the oil tank inner cover are sealed through the first oil seal and the second oil seal, and the shaft of the rotor and the oil tank are sealed through the third oil seal. A gas path and an oil path of the sucking pump are completely separated, the problems that parts are blocked or abraded due to high-temperature expansion caused by heat mixing and difficult heat dissipation are solved, the problem that lubricating oil is emulsified due to the fact that the lubricating oil leaks into a sucking cavity or wet gas is solved, and the running reliability of products is improved; not only are the production cost and the maintenance cost reduced, but also the sealing performance of the pump cavity is improved, and the maintenance difficulty is reduced.
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Description

Technical Field

[0001] The utility model belongs to the technical field of dry-type air pumps, in particular to a dry-type air pump for separating gas and oil. Background Art

[0002] Dry vacuum pumps such as Roots vacuum pumps and screw vacuum pumps achieve the suction and exhaust functions by having two rotors rotating synchronously in opposite directions, pushing the gas from the suction port to the exhaust port. This type of dry vacuum pump is equipped with a pair of synchronous gears in the oil tank at the driving end or non-driving end for the transmission of the two rotors. Existing Roots vacuum pumps and screw vacuum pumps all place the synchronous gears, shaft seal components and bearings in the oil tank at the driving end or non-driving end, and the above parts are lubricated and cooled by lubricating oil.

[0003] The following problems exist:

[0004] 1. The synchronous gears, bearings and shaft seal components are all concentrated in the small cavity of the pump end cover, resulting in poor heat dissipation effect of various parts and the pump itself when working. Various heats are mixed together, making it difficult to achieve rapid heat dissipation. Although lubrication and cooling are achieved through lubricating oil, it is also easy to cause high-temperature expansion, jamming or wear of parts.

[0005] 2. The installation space of the shaft seal is narrow, and the flushing of the shaft seal can only rely on the lubricating oil in the oil tank, so the sealing effect is poor. Even if two or more sealing schemes are used, it is difficult to solve the sealing problem. If a mechanical seal relies on splashing lubricating oil for flushing, lubrication and cooling, it is difficult to meet the needs of normal operation, and the mechanical seal is easily damaged. Therefore, when the pump is working, the lubricating oil leaks into the suction system, or the liquid in the gas leaks into the lubricating oil, causing the lubricating oil emulsification failure, which is a common problem.

[0006] 3. The pump end cover is also the lubricating oil tank. Due to limited space, it can generally only be cooled by a water-cooling coil, which is prone to problems such as coil scaling and blockage or interface leakage. Summary of the Invention

[0007] To overcome the above-mentioned shortcomings of the prior art, the present invention proposes a dry-type air pump with air-oil separation, which completely separates the air and oil circuits of the air pump, thus avoiding the problems of heat mixing and difficulty in heat dissipation, which can lead to high-temperature expansion, seizure, or wear of parts, as well as the problem of lubricating oil leaking into the air pump chamber or wet gas causing lubricating oil emulsification. The technical problem to be solved by the present invention is achieved through the following technical solutions:

[0008] A dry-type air pump with gas-oil separation comprises a pair of rotors arranged in a pump body, the two ends of the rotor being closed by a driving end side cover and a non-driving end side cover, the shaft of the rotor and the driving end side cover being sealed by a shaft sealing component, the non-driving end side cover being sealed by a rear end cover, a sealed maintenance-free bearing being arranged in the rear end cover, the sealed maintenance-free bearing being interference fit with the shaft of the rotor, and the driving end side cover being connected to the oil tank through an oil tank inner cover; a synchronous gear, a first bearing, a second bearing and a third bearing being arranged on the shaft of the rotor, the first bearing and the second bearing being arranged in the bearing cavity of the oil tank inner cover, the third bearing being arranged in the bearing cavity of the oil tank, the shaft of the rotor and the inner cover of the oil tank being sealed by a first oil seal and a second oil seal, and the shaft of the rotor and the oil tank being sealed by a third oil seal.

[0009] Furthermore, a sealed working air extraction cavity is formed between the driving end side cover and the non-driving end side cover.

[0010] Furthermore, a sealed space is formed between the fuel tank and the fuel tank inner cover.

[0011] Furthermore, a shaft seal seat is provided at one end of the driving end side cover, and an oil tank bracket is provided at the other end, and the shaft seal seat and the oil tank bracket are connected via an overhead support body.

[0012] Specifically, the fuel tank bracket is connected to the fuel tank through the fuel tank inner cover.

[0013] Specifically, one end of the fuel tank is cast into a closed structure, and the other end is an open structure, and the other end is connected to the fuel tank inner cover.

[0014] Specifically, an oil supply port is provided at the top of the oil tank, an oil discharge port is provided at the bottom of the oil tank, and an oil level sight glass mounting hole is provided at one end of the oil tank.

[0015] Preferably, a hollow partition is provided between the inner wall and the outer wall of the fuel tank, a water inlet is provided at the bottom of the hollow partition, and a water outlet is provided at the top of the hollow partition.

[0016] Preferably, the first oil seal, the second oil seal and the third oil seal can be replaced by isolators.

[0017] Preferably, the sealed maintenance-free bearing is axially fixed by a circlip or a round nut.

[0018] The utility model realizes complete separation of the air circuit and the oil circuit of the vacuum pump, avoids the problems of heat mixing and difficulty in heat dissipation resulting in high-temperature expansion, jamming or wear of parts, as well as the problem of lubricating oil leaking into the vacuum chamber or wet gas causing lubricating oil emulsification, thereby ensuring that the sucked gas is 100% not contaminated by oil and gas, and significantly improving the operating reliability of the product; not only will the oil tank not form negative pressure, the seal between the shaft head and the oil tank can fully meet the sealing requirements with only a skeleton oil seal or an isolator, thereby reducing production and maintenance costs; and there is no need to add lubricating oil between the non-driving end side cover and the rear end cover, and no shaft sealing component is needed, and the length of the shaft is shortened, the force on the shaft is reduced, the sealing of the pump chamber is improved, and the difficulty of maintenance is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural diagram of the utility model;

[0020] Figure 2 for Figure 1 Exploded diagram;

[0021] Figure 3 It is a structural diagram of the drive end side cover;

[0022] Figure 4 for Figure 3 AA cross-section of

[0023] Figure 5 It is a structural diagram of the fuel tank;

[0024] Figure 6 A cross-sectional view of the fuel tank. DETAILED DESCRIPTION

[0025] Figure 1 This is a schematic diagram of the structure of the utility model. Figure 2 for Figure 1 Exploded diagram, combined with Figure 1 and Figure 2 As shown, a dry-type air pump with gas-oil separation is provided in a pump body 16. The two ends of the rotor 1 are closed by a driving end side cover 2 and a non-driving end side cover 3. The shaft of the rotor 1 and the driving end side cover 2 are sealed by a shaft seal component 4, and the non-driving end side cover 3 is sealed by a rear end cover 5. A sealed maintenance-free bearing 6 is provided in the rear end cover 5. The sealed maintenance-free bearing 6 is interference fit with the shaft of the rotor 1. The driving end side cover 2 is connected to the oil tank 8 through an oil tank inner cover 7; a synchronous gear 9, a first bearing 10, a second bearing 11 and a third bearing 12 are provided on the shaft of the rotor 1, the first bearing 10 and the second bearing 11 are provided in the bearing cavity of the oil tank inner cover 7, and the third bearing 12 is provided in the bearing cavity of the oil tank 8. The shaft of the rotor 1 and the oil tank inner cover 7 are sealed by a first oil seal 13 and a second oil seal 14, and the shaft of the rotor 1 and the oil tank 8 are sealed by a third oil seal 15.

[0026] In this embodiment, the shaft sealing components 4 are a pair, which are respectively sealed with a pair of rotors 1; the maintenance-free bearings 6 are a pair, which are respectively interference fit with the shafts of the pair of rotors 1; the sealed maintenance-free bearings 6 can be strengthened with axial fixation by a retaining spring or a round nut 17.

[0027] A closed working air extraction chamber is formed between the driving end side cover 2 and the non-driving end side cover 3, and a closed space is formed between the oil tank 8 and the oil tank inner cover 7. Through these two closed spaces, the air circuit and the oil circuit of the air extraction pump are completely separated, avoiding heat mixing and difficulty in heat dissipation, which may lead to high-temperature expansion, jamming or wear of parts, as well as lubricating oil leakage into the air extraction chamber or emulsification of lubricating oil caused by wet gas. The lubricating oil will not leak outside the oil tank normally. Even if parts are damaged, the lubricating oil will only leak outside the pump, or leak onto the bracket of the driving end side cover and then flow out of the pump, and will never flow into the working air extraction chamber of the pump body.

[0028] In the present invention, since the non-driving end side cover 3 is directly sealed by the rear end cover 5 and is not connected to the outside world, and no lubricating oil is used between the non-driving end side cover 3 and the rear end cover 5, the non-driving end does not need to use a shaft sealing component, which saves two sets of shaft sealing components compared with the prior art. At the same time, the length of the shaft is shortened, the force on the shaft is reduced, the sealing performance of the pump chamber is improved, and the difficulty of maintenance is reduced.

[0029] Figure 3 This is a schematic diagram of the structure of the drive end side cover. Figure 4 for Figure 3 AA cross-section diagram, combined with Figure 3 and Figure 4 As shown, one end of the driving end side cover 2 is provided with a shaft seal seat 2.1, and the other end is provided with an oil tank bracket 2.2. The shaft seal seat 2.1 and the oil tank bracket 2.2 are connected by an overhead support body 2.3. The overhead support body 2.3 of this embodiment is provided with two through holes. There are two overhead support bodies 2.3, which are respectively arranged at the upper and lower ends. The oil tank bracket 2.2 is connected to the oil tank 8 through the oil tank inner cover 7. Compared with the existing dry vacuum pump, the utility model adds an overhead support body 2.3, an oil tank bracket 2.2 and an oil tank inner cover 7, so that the shaft seal seat 2.1 at one end is sealed with the shaft of the rotor 1 through the shaft seal component 4, and the oil tank bracket 2.2 at the other end is sealed with the oil tank inner cover 7 and the oil tank 8, while the shaft seal seat 2.1 and the oil tank bracket 2.2 are overhead, and the overhead support body 2.3 is used as a load-bearing column to ensure that the air path and the oil path of the vacuum pump are completely separated.

[0030] The driving end side cover 2 adopts two sets of shaft sealing components 4, and can adopt sealing solutions such as independently flushed double-end mechanical seals, dry gas single-end or double-end seals. Compared with the traditional solution using four sets of single-end internal oil flushing seals, oil seals, piston rings or lip seals, the sealing performance of the utility model is significantly improved. The outer side of the shaft sealing component 4 is connected to the atmosphere, and the use of external flushing liquid or dry gas flushing also improves the heat dissipation performance of the pump end face; in addition, an integral containerized mechanical seal can also be used to reduce the difficulty of installation and maintenance.

[0031] The first oil seal 13, the second oil seal 14 and the third oil seal 15 of the utility model can be replaced by an isolator. Since the oil tank 8 is separated from the working air pumping chamber and there is an overhead layer in between that is connected to the atmosphere, the first oil seal 13, the second oil seal 14 and the third oil seal 15 only prevent the oil in the oil tank 8 from leaking into the air, and have no effect on the air tightness of the pumping chamber. There is no pressure difference between the inside and outside of the oil tank 8, so the sealing requirement is relatively low.

[0032] Figure 5 The structural diagram of the fuel tank is shown in Figure 2. Figure 6 This is a cross-sectional view of the fuel tank, combined with Figure 5 and Figure 6 As shown, one end of the oil tank 8 is cast into a closed structure, and the other end is an open structure. The other end of the oil tank 8 is connected to the oil tank inner cover 7. An oil supply port 8.1 is provided at the top of the oil tank 8, an oil drain port 8.2 is provided at the bottom of the oil tank 8, and an oil level sight glass mounting hole 8.3 is provided at one end of the oil tank 8; a hollow partition 8.4 is provided between the inner wall and the outer wall of the oil tank 8, a water inlet 8.5 is provided at the bottom of the hollow partition 8.4, and a water outlet 8.6 is provided at the top of the hollow partition 8.4. The hollow partition 8.4 is a connected layer. Figure 5 The hollow partition 8.4 is only separated by the oil supply port 8.1 and the oil drain port 8.2. The hollow partition 8.4 is cooled by water, which solves the problem of using a water-cooled coil for cooling, which is prone to problems such as coil scaling and blockage or interface leakage.

[0033] In short, the utility model realizes the complete separation of the air circuit and the oil circuit of the vacuum pump, avoids the problems of heat mixing and difficulty in heat dissipation, which lead to high-temperature expansion, jamming or wear of parts, and the problem of lubricating oil leaking into the vacuum chamber or wet gas causing lubricating oil emulsification, ensuring that the sucked gas is 100% not contaminated by oil and gas, and significantly improves the operating reliability of the product; not only will the oil tank not form negative pressure, the requirements for the shaft seal are reduced, and the seal between the shaft head and the oil tank can fully meet the sealing requirements with a skeleton oil seal or an isolator, reducing production and maintenance costs; and there is no need to add lubricating oil between the non-drive end side cover and the rear end cover, and no shaft sealing components are needed, and the length of the shaft is shortened, the force on the shaft is reduced, the sealing of the pump chamber is improved, and the difficulty of maintenance is reduced; and the oil tank is provided with a hollow partition for water cooling, thereby solving the problems of cooling with a water-cooled coil, which is prone to coil scaling and clogging or interface leakage.

Claims

1. A dry air pump for separating gas and oil, comprising a pump body, a pair of rotors arranged in the pump body, characterized in that: Both ends of the rotor are closed by a driving end side cover and a non-driving end side cover, the shaft of the rotor is sealed with the driving end side cover by a shaft sealing component, the non-driving end side cover is sealed by a rear end cover, a sealed maintenance-free bearing is arranged in the rear end cover, the sealed maintenance-free bearing is interference fit with the shaft of the rotor, and the driving end side cover is connected to the oil tank through an oil tank inner cover; a synchronous gear, a first bearing, a second bearing and a third bearing are arranged on the shaft of the rotor, the first bearing and the second bearing are arranged in the bearing cavity of the oil tank inner cover, and the third bearing is arranged in the bearing cavity of the oil tank, the shaft of the rotor and the oil tank inner cover are sealed by a first oil seal and a second oil seal, and the shaft of the rotor and the oil tank are sealed by a third oil seal.

2. The dry type air pump for gas-oil separation according to claim 1, characterized in that: A closed working air extraction cavity is formed between the driving end side cover and the non-driving end side cover.

3. The dry type air pump for gas-oil separation according to claim 1, characterized in that: A closed space is formed between the oil tank and the oil tank inner cover.

4. The dry type air pump for gas-oil separation according to claim 1, characterized in that: One end of the driving end side cover is provided with a shaft seal seat, and the other end is provided with an oil tank bracket. The shaft seal seat and the oil tank bracket are connected through an overhead support body.

5. The dry type air pump for gas-oil separation according to claim 4, characterized in that: The fuel tank bracket is connected to the fuel tank through the fuel tank inner cover.

6. The dry type air pump for gas-oil separation according to claim 1, characterized in that: One end of the oil tank is cast into a closed structure, and the other end is an open structure, and the other end is connected to the oil tank inner cover.

7. The dry type air pump for gas-oil separation according to claim 6, characterized in that: An oil supply port is arranged on the top of the oil tank, an oil discharge port is arranged on the bottom of the oil tank, and an oil level sight glass mounting hole is arranged at one end of the oil tank.

8. The dry type air pump for gas-oil separation according to claim 1, characterized in that: A hollow partition is provided between the inner wall and the outer wall of the oil tank, a water inlet is provided at the bottom of the hollow partition, and a water outlet is provided at the top of the hollow partition.

9. The dry type air pump for gas-oil separation according to claim 1, characterized in that: The first oil seal, the second oil seal and the third oil seal may be replaced by isolators.

10. The dry type air pump for gas-oil separation according to claim 1, characterized in that: The sealed maintenance-free bearing is axially fixed by a retaining ring or a round nut.