Double-screw-rod vacuum pump

Abstract

The utility model belongs to the technical field of vacuum pumps for printing equipment, feeder heads, manipulators and robots, and particularly relates to a double-screw-rod vacuum pump which comprises a rotor spiral screw pump, an oil gas barrel and a double-cavity radiator. A first spiral screw rotor and a second spiral screw rotor which are meshed with each other are arranged in the rotor spiral screw pump, and the first spiral screw rotor is in transmission connection with a driving motor; the air inlet side of the rotor spiral screw pump sucks air through a vacuum interface; the gas outlet side of the rotor spiral screw pump is communicated with the oil gas barrel so as to convey lubricating oil and gas; an oil separator for lubricating oil and separated substances is arranged in the oil-gas barrel; an oil cooling cavity and a gas cooling cavity are formed in the double-cavity radiator; gas separated from the oil-gas barrel is communicated to the atmospheric environment or gas using equipment gas through the gas cooling cavity; and substance lubricating oil separated from the oil-gas barrel is communicated with the rotor spiral screw pump through the oil cooling cavity so as to reflow the lubricating oil. According to the scheme, efficient gas conveying can be achieved, energy saving and silence are achieved, and the vacuum pressure can be improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of vacuum pumps for printing equipment, feeder heads, manipulators and robots, and specifically relates to a double-screw vacuum pump. Background Art

[0002] In the printing industry, it is often necessary to use vacuum to suck and transport paper, and in the printing production line, it is necessary to use gas equipment to blow air to the paper. In the existing process, gas pumps are often used for gas pressurization and transportation. However, gas pumps are prone to noise pollution due to the large noise generated during use. Utility Model Content

[0003] In order to solve the above problems existing in the prior art, the present invention provides a double-screw vacuum pump.

[0004] The technical solution adopted by the utility model is:

[0005] A twin-screw vacuum pump comprises a rotor helical screw pump, a screw, an oil-gas barrel and a double-chamber radiator; the rotor helical screw pump is provided with two mutually interlocking first helical screw rotors and second helical screw rotors, and the first helical screw rotor is transmission-connected to a driving motor; the air inlet side of the rotor helical screw pump is inhaled through a vacuum interface; the air outlet side of the rotor helical screw pump is connected with the oil-gas barrel to transport lubricating oil and gas; an oil-gas separation core for separating lubricating oil and gas is provided in the oil-gas barrel; an oil cooling chamber and a gas cooling chamber are provided in the double-chamber radiator; the gas separated by the oil-gas barrel is connected to the atmosphere or gas-using equipment via the gas cooling chamber to transport the gas; the lubricating oil separated by the oil-gas barrel is connected to the rotor helical screw pump via the oil cooling chamber to reflux the lubricating oil.

[0006] As a supplement or alternative to the above solution: the rotor helical screw pump includes a pump casing, and both ends of the two helical screw rotors are connected to the pump casing through respective bearings.

[0007] As a supplement or alternative to the above solution: the bearing is a tapered roller bearing, and the drive motor is a variable frequency permanent magnet motor.

[0008] As a supplement or alternative to the above solution: the ratio of the number of double helices of the first helical screw rotor to that of the second helical screw rotor is 4:6.

[0009] As a supplement or alternative to the above solution: the pump housing is provided with an air inlet, a gas filter and an air inlet valve, and the gas filter is connected to the air inlet through the air inlet valve.

[0010] As a supplement or alternative to the above solution: an air outlet is provided on the pump housing, and the air outlet is connected to the oil and gas inlet on the barrel wall of the oil and gas barrel through a pipeline to transport lubricating oil and gas.

[0011] As a supplement or alternative to the above solution: an oil return inlet is provided on the pump housing, and the oil cavity outlet of the oil cooling cavity is connected to the oil return inlet through a pipeline.

[0012] As a supplement or alternative to the above solution: an oil return outlet is provided on the barrel wall at the lower part of the oil and gas barrel, and the oil return outlet is connected to the oil cavity inlet of the oil cooling cavity through a pipeline.

[0013] As a supplement or alternative to the above scheme: a flange cover is arranged on the top of the oil and gas barrel, and a gas exhaust port is arranged on the flange cover. The gas exhaust port is connected to the air cavity inlet of the gas cooling cavity through a new pipeline, and the air cavity outlet of the gas cooling cavity is connected to a pressure regulating valve through a pipeline.

[0014] The beneficial effects of the utility model are as follows: the present invention adopts a rotor helical screw pump to mix and transport lubricating oil and gas, which can effectively reduce noise and noise pollution at a lower rotation speed; after the vacuum pump transportation efficiency is improved, energy saving and noise reduction can be achieved to a certain extent. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below.

[0016] Figure 1 This is the piping structure diagram of the double-screw vacuum pump in this scheme;

[0017] Figure 2 It is a schematic diagram of the internal structure of the rotor helical screw pump;

[0018] Figure 3 This is the matching structure diagram of the rotor helical screw pump and the drive motor;

[0019] Figure 4 It is a schematic diagram of the structure of the oil and gas barrel;

[0020] Figure 5 It is a structural schematic diagram of a double-chamber radiator.

[0021] In the figure: 1-gas filter; 2-inlet valve; 3-rotor helical screw pump; 31-pump housing; 32-first helical screw rotor; 33-second helical screw rotor; 34-bearing; 35-air inlet; 36-air outlet; 37-return oil inlet; 4-drive motor; 5-filter; 6-dual-chamber radiator; 61-oil chamber inlet; 62-oil chamber outlet; 63-air chamber inlet; 64-air chamber outlet; 7-gas-using equipment; 8-oil and gas barrel; 81-return oil outlet; 82-oil and gas inlet; 83-flange cover; 84-gas exhaust port; 85-exhaust safety valve; 86-bolt hole; 87-oil and gas separation core; 9-pressure regulating valve; 10-vacuum interface. DETAILED DESCRIPTION

[0022] The technical solution in this embodiment will be clearly and completely described below in conjunction with the accompanying drawings. The implementation described is only a part of the implementation example, not all of it. Based on the implementation example in this solution, all other implementation examples obtained by the technicians without making any creative work are within the protection scope of this solution.

[0023] Example 1

[0024] like Figures 1 to 5 As shown, this embodiment designs a twin-screw vacuum pump, including a gas filter 1, an intake valve 2, a rotor spiral screw pump 3, an oil and gas tank 8, a double-chamber radiator 6, a driving electric pump 4, a pressure regulating valve 9 and other components.

[0025] The rotor helical screw pump 3 includes components such as a pump housing 31, a first helical screw rotor 32 and a second helical screw rotor 33. The first helical screw rotor 32 and the second helical screw rotor 33 engage with each other and are installed in the pump housing 31 of the rotor helical screw pump 3. Both ends of the first helical screw rotor 32 are connected to the pump housing 31 through a bearing 34 respectively, and both ends of the second helical screw rotor 33 are also connected to the pump housing 31 through a bearing 34 respectively. The bearing 34 is a tapered roller bearing 34, so as to improve the stability of the first helical screw rotor 32 and the second helical screw rotor 33 when rotating.

[0026] The first helical screw rotor 32 is drivingly connected to the drive motor 4; the drive motor 4 can be a variable frequency permanent magnet motor, which can reduce the noise and energy consumption of the entire equipment by utilizing the high performance, low consumption, high efficiency, low noise, and low vibration of the variable frequency permanent magnet motor.

[0027] The gear ratio of the first helical screw rotor 32 to the second helical screw rotor 33 may be 4:6. The first helical screw rotor 32 is 4-directional, and the second helical screw rotor 33 is 6-directional. This asymmetric structure can reduce the gap between the two helical screw rotors, so that the reflux loss on both sides of the helical screw rotor is small. This four-to-six helical screw rotor structure can improve efficiency by 10%-20% and increase power saving by 25%.

[0028] The pump housing 31 is made of high-strength cast iron and has a thickened and reinforced housing design, thereby reducing the vibration of the main engine and increasing the overall service life of the main engine.

[0029] A wear-resistant oil seal is also provided at the connection between the first helical screw rotor 32 and the second helical screw rotor 33 and the pump housing 31. The oil seal is made of highly wear-resistant material of Japan Daikin (PTFE), a 304 stainless steel skeleton, and a special processing technology, so as to improve the anti-leakage level and extend the service life.

[0030] An air inlet 35, a gas filter 1 and an air inlet valve 2 are provided on the pump housing 31 on the air inlet side of the rotor screw pump 3. The gas filter 1 is connected to the air inlet 35 through the air inlet valve 2. When the rotor screw pump 3 is running, the air inlet 35 sucks air from the vacuum interface to the equipment connected to the vacuum interface, and the gas enters the rotor screw pump 3 through the gas filter 1 and the air inlet valve 2 in turn.

[0031] An air outlet 36 is provided on the air outlet side of the rotor helical screw pump 3, and the air outlet 36 is connected to the oil and gas inlet 82 on the barrel wall of the oil and gas barrel 8 through a pipeline to transport lubricating oil and gas. When the rotor helical screw pump 3 is running, the gas on the air inlet side is pressurized by the helical screw rotor and mixed with the lubricating oil, and then enters the oil and gas barrel 8 through the air outlet 36, the pipeline, and the oil and gas inlet 82 in sequence.

[0032] An oil-gas separation core 87 for separating lubricating oil and gas is provided in the oil-gas barrel 8, and the oil-gas separation core 87 can separate gas and lubricating oil. The double-chamber radiator 6 is provided with an oil cooling chamber and a gas cooling chamber, and the two cooling chambers are used for cooling lubricating oil and gas respectively. In addition, the double-chamber radiator 6 can also be replaced by two independent radiators. A flange cover 83 is provided on the top of the oil-gas barrel 8, and a gas exhaust port 84 is provided on the flange cover 83. The gas exhaust port 84 is connected to the gas cavity inlet 63 of the gas cooling cavity through a pipeline, and the gas cavity outlet 64 of the gas cooling cavity is connected to the pressure regulating valve 9 through a pipeline. The gas separated by the oil-gas barrel 8 is connected to the atmospheric environment or the gas-using equipment 7 through the gas cooling cavity to transport the gas. An oil return inlet 37 is provided on the pump housing 31, and the oil chamber outlet 62 of the oil cooling chamber is connected to the oil return inlet 37 through a pipeline. An oil return outlet 81 is provided on the barrel wall at the lower part of the oil and gas barrel 8, and the oil return outlet 81 is connected to the oil chamber inlet 61 of the oil cooling chamber through a pipeline. The lubricating oil separated from the oil and gas barrel 8 is connected to the rotor helical screw pump 3 through the oil cooling chamber to return the lubricating oil.

[0033] An exhaust safety valve 85 is also provided on the flange cover 83 to prevent the gas pressure in the oil and gas barrel 8 from increasing. A plurality of bolt holes 86 are provided on the edge of the flange cover 83 to facilitate the connection between the flange cover 83 and the barrel body of the oil and gas barrel 8.

[0034] The pressure regulating valve 9 can regulate and control the pressure of the gas delivered to the gas-consuming device 7 to be within a pressure range suitable for use.

[0035] The above embodiments are merely examples for the purpose of clarifying the description, and are not intended to limit the implementation methods; it is not necessary and impossible to list all implementation methods exhaustively. However, obvious changes or modifications derived therefrom are still within the scope of protection of the present technology.

Claims

1. Double screw vacuum pump, characterized by: The invention comprises a rotor helical screw pump (3), an oil and gas barrel (8) and a double-chamber radiator (6); the rotor helical screw pump (3) is provided with two mutually interlocking first helical screw rotors (32) and second helical screw rotors (33), and the first helical screw rotor (32) is drivingly connected to a driving motor (4); the air inlet side of the rotor helical screw pump (3) is sucked through a vacuum interface; the air outlet side of the rotor helical screw pump (3) is connected to the oil and gas barrel (8) to transport lubricating oil and gas; the oil and gas barrel (8) is provided with an oil and gas separation core (87) for separating lubricating oil and gas; the double-chamber radiator (6) is provided with an oil cooling chamber and a gas cooling chamber; the gas separated by the oil and gas barrel (8) is connected to the atmosphere or gas-using equipment (7) through the gas cooling chamber to transport the gas; the lubricating oil separated by the oil and gas barrel (8) is connected to the rotor helical screw pump (3) through the oil cooling chamber to reflux the lubricating oil.

2. The twin-screw vacuum pump according to claim 1, characterized in that: The rotor helical screw pump (3) comprises a pump casing (31), and two ends of two helical screw rotors are connected to the pump casing (31) via respective bearings (34).

3. The twin-screw vacuum pump according to claim 2, characterized in that: The bearing (34) is a tapered roller bearing (34), and the drive motor (4) is a variable frequency permanent magnet motor.

4. The twin-screw vacuum pump according to claim 2, characterized in that: The ratio of the number of double helices of the first helical screw rotor (32) to that of the second helical screw rotor (33) is 4:

6.

5. The twin-screw vacuum pump according to any one of claims 2 to 4, characterized in that: The pump housing (31) is provided with an air inlet (35), a gas filter (1) and an air inlet valve (2); the gas filter (1) is connected to the air inlet (35) via the air inlet valve (2).

6. The twin-screw vacuum pump according to claim 5, characterized in that: An air outlet (36) is provided on the pump housing (31), and the air outlet (36) is connected to an oil and gas inlet (82) on the barrel wall of the oil and gas barrel (8) through a pipeline to transport lubricating oil and gas.

7. The twin-screw vacuum pump according to claim 5, characterized in that: An oil return inlet (37) is provided on the pump housing (31), and an oil chamber outlet (62) of the oil cooling chamber is connected to the oil return inlet (37) via a pipeline.

8. The twin-screw vacuum pump according to claim 7, characterized in that: An oil return outlet (81) is provided on the barrel wall at the lower part of the oil and gas barrel (8), and the oil return outlet (81) is connected to the oil chamber inlet (61) of the oil cooling chamber through a pipeline.

9. The twin-screw vacuum pump according to any one of claims 6 to 8, characterized in that: A flange cover plate (83) is provided on the top of the oil and gas barrel (8), and a gas exhaust port (84) is provided on the flange cover plate (83). The gas exhaust port (84) is connected to the gas cavity inlet (63) of the gas cooling cavity through a new pipeline, and the gas cavity outlet (64) of the gas cooling cavity is connected to a pressure regulating valve (9) through a pipeline.

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