Gas-oil separation dry type sucking pump

Through the design of the gas oil separation structure in the dry pump, the complete separation of the air path and the oil circuit solves the problem of poor heat dissipation effect and lubricating oil leakage in existing technology, improve the reliability and sealing of the product, reduce Cost.

CN119333392APending Publication Date: 2025-01-21GUANGDONG KENFLO PUMP CO LTD
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Patent Information

Application Number
CN202411756695.6
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-02
Publication Date
2025-01-21

AI Technical Summary

Technical Problem

In existing dry-type air pumps, synchronous gears, bearings and shaft seal components are concentrated in the small cavity of the pump end cover, resulting in poor heat dissipation effect and prone to high-temperature expansion and stuck or wear; at the same time, shaft sealing effect Poor oil leakage and emulsification failure are likely to occur.

Method used

A dry air suction pump for gas and oil separation is designed. A pair of rotors is installed in the pump body, and a closed working suction chamber is formed between the driving end side cover and the non-driving end side cover. A closed space is formed between them to achieve complete separation of the gas circuit and the oil circuit. Seal with sealed maintenance-free bearings and skeleton oil seals or isolators to avoid heat mixing and lubricant leakage.

Benefits of technology

The air and oil circuits of the air pump are completely separated, avoiding heat mixing and lubricating oil leakage, improving the operational reliability and sealing of the product, and reducing production and maintenance costs.

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Abstract

The invention belongs to the technical field of dry-type sucking pumps, and particularly relates 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 through a driving end side cover and a non-driving end side cover, shafts of the rotors and the driving end side covers are sealed through shaft sealing parts, and the non-driving end side covers are sealed through 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. Complete separation of a gas path and an oil path of the sucking pump is achieved, 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 lubricating oil leaks into a sucking cavity or wet gas is solved, and the running reliability of a product 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 invention belongs to the technical field of dry air pumps, in particular to a dry air pump for separating gas and oil. Background Art

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

[0003] There are the following problems:

[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 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 more than two sealing schemes are used, it is difficult to solve the sealing problem. If a mechanical seal is used to flush, lubricate and cool by splashing lubricating oil, it is difficult to meet the needs of normal work, 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 is a common problem.

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

[0007] In order to overcome the defects of the above-mentioned prior art, the present invention proposes a dry air pump with air-oil separation, which realizes the complete separation of the air circuit and the oil circuit of the air pump, avoids the problem of heat mixing and difficulty in heat dissipation, which leads to the problem of high-temperature expansion, jamming or wear of parts, and the problem of lubricating oil leaking into the air pump cavity 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 air-oil separation has a pair of rotors arranged in a pump body, the two 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, the third bearing is arranged in the bearing cavity of the oil tank, the shaft of the rotor is sealed with the oil tank inner cover by a first oil seal and a second oil seal, and the shaft of the rotor is sealed with the oil tank by a third oil seal.

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

[0010] Furthermore, a closed space is formed between the oil tank and the oil 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 oil tank is cast into a closed structure, and the other end is an open structure, and the other end is connected to the inner cover of the oil tank.

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

[0015] Preferably, 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.

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

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

[0018] The present invention achieves 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, and lubricating oil leakage 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 improves the operating reliability of the product; not only will the oil tank not form negative pressure, but the seal between the shaft head and the oil tank can fully meet the sealing requirements by using 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 there is no need to use a shaft sealing component, 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 schematic diagram of the present invention;

[0020] Figure 2 for Figure 1 Exploded diagram of

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

[0022] Figure 4 for Figure 3 AA section view;

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

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

[0025] Figure 1 It is a structural schematic diagram of the present invention, Figure 2 for Figure 1 Exploded diagram, combined with Figure 1 and Figure 2 As shown, a dry-type air pump for 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 is sealed with the driving end side cover 2 by a shaft seal component 4. 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. The third bearing 12 is provided in the bearing cavity of the oil tank 8. The shaft of the rotor 1 is sealed with the oil tank inner cover 7 by a first oil seal 13 and a second oil seal 14. The shaft of the rotor 1 is sealed with the oil tank 8 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 axially fixed 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 due to 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 closed 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. Compared with the prior art, two sets of shaft sealing components are omitted, and at the same time, 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.

[0029] Figure 3 This is a schematic diagram of the structure of the drive end side cover. Figure 4 for Figure 3 AA profile, combined with Figure 3 and Figure 4 As shown, a shaft seal seat 2.1 is provided at one end of the driving end side cover 2, and an oil tank bracket 2.2 is provided at the other end. 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. The number of overhead support bodies 2.3 is two, 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 present invention 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, thereby ensuring 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 present invention is significantly improved. The outer side of the shaft sealing component 4 is connected to the atmosphere, and external flushing liquid or dry gas flushing is used, which 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 present invention 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 schematic diagram of the fuel tank structure is as follows: Figure 6 This is a cross-sectional view of the fuel tank. 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 arranged at the top of the oil tank 8, an oil discharge port 8.2 is arranged at the bottom of the oil tank 8, and an oil level sight glass mounting hole 8.3 is arranged at one end of the oil tank 8; a hollow partition 8.4 is arranged between the inner wall and the outer wall of the oil tank 8, a water inlet 8.5 is arranged at the bottom of the hollow partition 8.4, and a water outlet 8.6 is arranged 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 discharge 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 coil scaling and clogging or interface leakage.

[0033] In short, the present invention realizes the complete separation of the gas circuit and the oil circuit of the vacuum pump, avoids the problem of heat mixing and difficulty in heat dissipation, which leads 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, ensures 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 by using 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 there is no need to use a shaft sealing component, and the length of the shaft is shortened, reducing the force on the shaft, improving the sealing of the pump chamber, and reducing the difficulty of maintenance; and the oil tank is provided with a hollow partition for water cooling, thereby solving the problem of cooling with a water-cooled coil, which is prone to coil scaling and blockage or interface leakage.

Claims

1. A dry air pump for gas-oil separation, comprising a pump body, in which a pair of rotors are arranged, characterized in that: The two 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, the third bearing is arranged in the bearing cavity of the oil tank, the shaft of the rotor is sealed with the oil tank inner cover by a first oil seal and a second oil seal, and the shaft of the rotor is sealed with the oil tank by a third oil seal.

2. The dry type air pump for gas-oil separation according to claim 1 is 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 is 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 is characterized in that: 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. The shaft seal seat and the oil tank bracket are connected via an overhead support body.

5. The dry type air pump for gas-oil separation according to claim 4 is 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 is 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 inner cover of the oil tank.

7. The dry type air pump for gas-oil separation according to claim 6 is characterized in that: An oil supply port is arranged at the top of the oil tank, an oil discharge port is arranged at 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 is characterized in that: A hollow partition is arranged between the inner wall and the outer wall of the oil tank, a water inlet is arranged at the bottom of the hollow partition, and a water outlet is arranged 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.