Double-motor screw vacuum pump with built-in cooling rotor

Abstract

The utility model relates to a double-motor screw vacuum pump with a built-in cooling rotor. The motor comprises a motor shell, a gear box, a pump shell and a front end cover, one end of the motor shell is fixed to one end of the gear box, the other end of the gear box is fixed to one end of the pump shell, and the front end cover is fixed to the other end of the pump shell. Each rotor mechanism comprises a rotor assembly, a motor and a protective gear, one end of the rotor assembly is installed at the other end of the motor shell, the middle of the rotor assembly is installed at the other end of the gear box, the front half portion of the rotor assembly is of a cantilever type structure and located in the pump shell, and the motor is installed on the rotor assembly and located in the motor shell; the protection gear is installed on the rotor assembly and located in the gear box, and a cooling liquid channel is formed in the rotor mechanism; the two rotor mechanisms are installed side by side. The motor provided by the utility model is good in heat dissipation effect, facilitates the maintenance of the rotor, and is small in size.

Description

TECHNICAL FIELD

[0001] The utility model relates to a screw vacuum pump especially to a double motor screw vacuum pump with rotor built-in cooling, which can be applied in photovoltaic, semiconductor, chemical industry and other fields. BACKGROUND

[0002] The screw vacuum pump is usually a dry pump, and the gas generated heat in the compression and transportation process is difficult to dissipate because there is no cooling liquid in the pumping cavity of the screw vacuum pump, so the heat dissipation problem of the screw vacuum pump needs to be solved. The commonly used cooling methods are divided into two kinds of air cooling and water cooling. The air cooling method is realized by increasing the heat dissipation fins on the shell of the screw vacuum pump and externally arranging the fan; the water cooling method is to increase the cooling jacket in the shell of the screw vacuum pump, and the cooling liquid flows in the cooling jacket to cool the screw vacuum pump. Both of the two cooling methods have a common shortcoming, that is, they are cooled from the outside to the inside of the screw vacuum pump, which is difficult to effectively cool the whole rotor, and can only cool the shell and the outer circle of the rotor, and the heat dissipation effect of the high temperature at the root of the rotor is not ideal. Under some working conditions, the high temperature at the root of the rotor will be transmitted to the seals and bearings on both sides of the rotor through the rotor shaft, and these parts will affect their service life under the action of high temperature, thereby affecting the overall performance of the screw vacuum pump.

[0003] At the same time, in the actual use process of the screw vacuum pump, the process gas sucked usually produces dust, glue and other impurities in the pump, and the gap value reserved between the rotor and the shell during normal use of the screw vacuum pump is relatively small, so the accumulation of these dust and other impurities may cause the machine to be stuck, affecting the normal use of the vacuum pump. Therefore, the maintenance of the vacuum pump mainly cleans the rotor to clean the dust and other impurities accumulated on the rotor, and the commonly used screw vacuum pump needs to be completely disassembled to clean the impurities accumulated on the rotor during maintenance, which is difficult to operate in the process site where the screw vacuum pump is used, thereby causing the problem of difficult maintenance. The essence of this problem is that the commonly used screw vacuum pump has its support bearings distributed at both ends of the rotor, so the rotor and the shell can be separated only after the bearings at both ends of the rotor are removed, which is almost equivalent to completely disassembling the whole screw vacuum pump, which has high requirements for the disassembling tool and the operator, and the work of disassembling the screw vacuum pump is large, which brings great inconvenience to the maintenance of the screw vacuum pump. UTILITY MODEL CONTENTS

[0004] The utility model aims at overcoming the above-mentioned deficiencies in the prior art, and provides a double motor screw vacuum pump with built-in cooling rotor, which has reasonable structure design, good heat dissipation effect, is convenient to maintain, small in size and good in heat dissipation effect.

[0005] The utility model discloses a rotor built-in cooling's double motor screw vacuum pump, including motor shell, gear box, pump shell and front end cover, one end of motor shell and the one end of gear box are fixed, the other end of gear box and the one end of pump shell are fixed, be provided with gear box cavity in gear box, the front end cover is fixed in the other end of pump shell, and its structural characteristics lie in: still including two sets of rotor mechanism, and each rotor mechanism includes rotor assembly, motor and protection gear, one end of rotor assembly is installed in the other end of motor shell, and the middle part of this rotor assembly is installed in the other end of gear box, and the front half of rotor assembly is cantilever type structure and is located in pump shell, and the motor is installed on rotor assembly, and the motor is located in motor shell, and the protection gear is installed on rotor assembly, and the protection gear is located in the gear box cavity of gear box, and the inside of rotor mechanism is provided with cooling liquid channel, two sets of rotor mechanism are installed side by side, and the teeth of one protection gear in two sets of rotor mechanism are embedded in the tooth slot of another protection gear, but the two protection gears in two sets of rotor mechanism do not contact.

[0006] As preferred, the rotor assembly includes a rotor shaft, a shaft sleeve, a shaft sleeve, and a rotor. The front half of the rotor shaft is sleeved in the rear half of the rotor, and an axle sleeve mounting cavity is formed between the front end of the rotor shaft and the front end of the rotor. The shaft sleeve is fixed to the front end of the rotor shaft and located in the axle sleeve mounting cavity. The shaft sleeve is sleeved in the rotor shaft and located in the front half of the rotor shaft. The motor and the protection gear are directly installed on the rotor shaft. The two rotors in the two sets of rotor mechanisms cooperate.

[0007] As preferred, the motor shell includes a first bearing and a bearing seat. The bearing seat is fixed to the other end of the motor shell. The rear end of the rotor shaft is installed on the bearing seat through the first bearing. The gear box includes a second bearing. The other end of the gear box is provided with a bearing hole. The second bearing is installed in the bearing hole. The middle part of the rotor shaft is installed on the second bearing.

[0008] As preferred, the rotor shaft is hollow. The rotor shaft is provided with a rotor shaft cooling channel. The shaft sleeve is hollow. The shaft sleeve is provided with a shaft sleeve cooling channel. The head of the shaft sleeve cooling channel and the tail of the rotor shaft cooling channel are communicated. The shaft sleeve is provided with a shaft sleeve cavity. The head of the shaft sleeve cavity and the tail of the shaft sleeve cooling channel are communicated. The rotor is hollow. The front end of the rotor is provided with a cover.

[0009] As preferred, the bearing seat is provided with a cooling liquid input hole. The cooling liquid input hole and the head of the rotor shaft cooling channel in the rotor shaft are communicated.

[0010] Preferably, the outer wall of the shaft sleeve and the inner wall of the rotor form a front rotor cooling cavity, the outer wall of the front part of the rotor shaft and the inner wall of the rotor form a rear rotor cooling cavity, and the outer wall of the rear half of the shaft sleeve tube and the inner wall of the rotor shaft form a cooling liquid return cavity.

[0011] Preferably, the tail part of the shaft sleeve is provided with a shaft sleeve hole, the tail part of the shaft sleeve cavity and the head part of the front rotor cooling cavity are communicated through the shaft sleeve hole, the front end of the rotor shaft is provided with a horizontal rotor shaft cooling liquid inlet hole, the tail part of the front rotor cooling cavity and the head part of the rear rotor cooling cavity are communicated through the rotor shaft cooling liquid inlet hole, the rotor shaft is provided with a rotor shaft radial through hole, the tail part of the rear rotor cooling cavity and the head part of the cooling liquid return cavity are communicated through the rotor shaft radial through hole, the rotor shaft is provided with a rotor shaft cooling liquid return hole, the guard gear is provided with a gear cooling liquid return hole, the gear cooling liquid return hole is aligned with the rotor shaft cooling liquid return hole, the tail part of the cooling liquid return cavity sequentially passes through the rotor shaft cooling liquid return hole and the gear cooling liquid return hole and is communicated with a gear box cavity in the gear box, and the bottom of the gear box is provided with a cooling liquid outlet hole.

[0012] Preferably, the front rotor cooling cavity, the rear rotor cooling cavity and the cooling liquid return cavity are all circular ring structures, the number of the shaft sleeve holes on the shaft sleeve is 4-8, the number of the rotor shaft cooling liquid inlet holes, the number of the rotor shaft radial through holes and the number of the rotor shaft cooling liquid return holes on the rotor shaft are all 4-8, and the number of the gear cooling liquid return holes on the guard gear is equal to the number of the rotor shaft cooling liquid return holes.

[0013] Preferably, the material of the rotor is aluminum, magnesium-aluminum alloy or titanium alloy, and the material of the pump shell is aluminum, magnesium-aluminum alloy or titanium alloy.

[0014] Preferably, the guard gear is fixed on the rotor shaft through a key.

[0015] A rotor cooling method of a double-motor screw vacuum pump with a built-in rotor cooling function, characterized in that: cooling liquid for cooling enters through a cooling liquid inlet hole, sequentially passes through a cooling liquid channel composed of a rotor shaft cooling channel, a shaft sleeve tube cooling channel, a shaft sleeve cavity, a shaft sleeve hole, a front rotor cooling cavity, a rotor shaft cooling liquid inlet hole, a rear rotor cooling cavity, a rotor shaft radial through hole, a cooling liquid return cavity and a rotor shaft cooling liquid return hole, and then enters a gear box cavity of a gear box through a gear cooling liquid return hole, and flows out from a cooling liquid outlet hole of the gear box, so as to complete the cooling of the whole rotor assembly.

[0016] Compared with the prior art, the utility model has the following advantages and effects: the utility model improves the stability of the screw vacuum pump, reduces the overall volume of the pump and reduces the maintenance difficulty of the screw vacuum pump.

[0017] In order to solve the problem that the cooling liquid in the screw vacuum pump is difficult to cool to the rotor root, the utility model provides a scheme of opening a hole in the rotor shaft and installing a shaft sleeve pipe and a shaft sleeve for guiding the flow direction of the cooling liquid to carry out cooling. Through the cooling liquid input hole at the end of the rotor shaft, the cooling liquid is pumped into the rotor shaft, and then the flow is guided through the shaft sleeve pipe and the shaft sleeve in the rotor, so that the purpose of cooling the rotor is achieved from the rotor shaft. Compared with the existing cooling form of external fan or cooling jacket, the cooling mode of the utility model directly cools the rotor from the inside to the outside, and the cooling effect is more remarkable.

[0018] In order to solve the problem that the screw vacuum pump is difficult to maintain and disassemble, the utility model sets the bearing supporting the rotor to one end and the middle part of the rotor shaft, so that the rotor becomes a cantilever structure. Since the bearing is not in direct contact with the pump shell, the pump shell is only fixed on the gear box, so that the pump shell does not need to be disassembled when disassembled, and the disassembly is convenient. After the pump shell is disassembled, the rotor is exposed, and the rotor can be cleaned, so that the disassembly and assembly when the rotor needs to be maintained are very convenient. The biggest advantage of this scheme in the utility model is that the disassembled parts are few, and the disassembly does not affect the sealing parts and the bearing, and has no effect on the gap value of the rotor. After maintenance, the pump shell can be directly assembled and used. In order to improve the stability of the cantilever structure and reduce the disassembly difficulty, the materials of the rotor and the pump shell of the cantilever are preferably not conventional steel materials, and preferably can be adjusted, such as selecting aluminum and other metal materials with smaller density.

[0019] The utility model provides a solution of double motor drive, adopts two motors to drive two rotor shafts respectively, and the power demand of single motor is reduced by half, and both of the two motors adopt direct connection form installation, namely the rotor of motor is directly sleeved on the rotor shaft of screw vacuum pump. Taking 15kW motor as an example, the motor shell diameter and length of 7.5kW motor are far smaller than single 15kW motor, therefore, two 7.5kW motors are installed on two rotor shafts respectively, which can not only shorten the total length of screw vacuum pump, but also reduce the height, and utilize the originally vacant space in front of the rotor mechanism, and the width of screw vacuum pump is also not increased, and the overall size is more compact than single 15kW motor. Meanwhile, the screw vacuum pump of single motor needs gear or belt etc. to drive between main rotor and slave rotor, and the double motor scheme directly drives independently through motor, cancels a transmission structure, and improves energy efficiency again. DRAWINGS

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model and / or the prior art, the drawings used in the description of the embodiments and / or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a front view schematic diagram of the dual-motor screw vacuum pump with built-in rotor cooling in an embodiment of this utility model.

[0022] Figure 2 This is a schematic diagram of the internal structure of a dual-motor screw vacuum pump with built-in rotor cooling in an embodiment of this utility model.

[0023] Figure 3 yes Figure 2 A magnified structural diagram of point A in the middle.

[0024] Figure 4 yes Figure 2 A magnified structural diagram of section B.

[0025] Figure 5 yes Figure 2 A magnified structural diagram of point C.

[0026] Figure 6 yes Figure 2 A magnified structural diagram of point D in the middle.

[0027] In the diagram: 1-Motor housing; 2-Gearbox; 3-Pump housing; 4-Front end cover; 5-Rotor mechanism; 11-Bearing No. 1; 12-Bearing housing; 13-Coolant inlet hole; 14-Motor; 21-Bearing hole; 22-Bearing No. 2; 23-Gearbox cavity; 24-Protective gear; 25-Key; 51-Rotor shaft; 52-Shaft sleeve; 53-Shaft sleeve; 54-Rotor; 55-Rotor shaft cooling channel; 56-Shaft sleeve cooling channel; 57-Shaft sleeve cavity; 58-Shaft sleeve mounting cavity; 59-Cap; 61-Shaft sleeve hole; 62-Rotor shaft coolant inlet hole; 63-Rotor shaft radial through hole; 64-Rotor shaft coolant return hole; 65-Gear coolant return hole; 71-Rotor front cooling cavity; 72-Rotor rear cooling cavity; 73-Coolant return cavity. Detailed Implementation

[0028] The present invention will be further described in detail below with reference to the accompanying drawings and through embodiments. The following embodiments are explanations of the present invention, but the present invention is not limited to the following embodiments.

[0029] Example

[0030] SeeFigures 1 to 6 The double-motor screw vacuum pump with rotor built-in cooling in the embodiment comprises a motor shell 1, a gear box 2, a pump shell 3, a front end cover 4 and two sets of rotor mechanisms 5.

[0031] One end of the motor shell 1 and one end of the gear box 2 are fixed, the other end of the gear box 2 and one end of the pump shell 3 are fixed, a gear box cavity 23 is arranged in the gear box 2, and the front end cover 4 is fixed at the other end of the pump shell 3. The pump shell 3 and the gear box 2 are directly fixed, so that when the pump shell 3 and the front end cover 4 are directly disassembled, the assembly requirements inside the double-motor screw vacuum pump will not be affected.

[0032] Each of the rotor mechanisms 5 in the embodiment comprises a rotor assembly, a motor 14 and a protective gear 24, one end of the rotor assembly is installed at the other end of the motor shell 1, the middle part of the rotor assembly is installed at the other end of the gear box 2, the front half of the rotor assembly is a cantilever structure and is located in the pump shell 3, the motor 14 is installed on the rotor assembly and is located in the motor shell 1, the protective gear 24 is installed on the rotor assembly and is located in the gear box cavity 23 of the gear box 2, and the inside of the rotor mechanism 5 is provided with a cooling liquid channel; the two sets of rotor mechanisms 5 are installed side by side, the teeth of one protective gear 24 in the two sets of rotor mechanisms 5 are embedded in the tooth groove of the other protective gear 24, but the two protective gears 24 in the two sets of rotor mechanisms 5 do not contact each other.

[0033] The rotor assembly in the embodiment comprises a rotor shaft 51, a shaft sleeve 52, a shaft sleeve 53 and a rotor 54, the front half of the rotor shaft 51 is sleeved in the rear half of the rotor 54, and the shaft sleeve installation cavity 58 is formed between the front end of the rotor shaft 51 and the front end of the rotor 54, the shaft sleeve 53 is fixed on the front end of the rotor shaft 51, and the shaft sleeve 53 is located in the shaft sleeve installation cavity 58; the shaft sleeve 52 is sleeved in the rotor shaft 51 and located in the front half of the rotor shaft 51; the motor 14 and the protection gear 24 are both directly installed on the rotor shaft 51, and the protection gear 24 is usually fixed on the rotor shaft 51 through the key 25. The two rotors 54 in the two sets of rotor mechanisms 5 are matched but not in contact, that is, the teeth on the two rotors 54 are matched but not in contact, and when the two rotors 54 are driven to rotate by the motors 14 connected thereto, the two rotors 54 can compress and transport the working medium. The material of the rotor 54 is preferably aluminum, magnesium-aluminum alloy or titanium alloy, and the material of the pump shell 3 is preferably aluminum, magnesium-aluminum alloy or titanium alloy. The two rotor shafts 51 in the two sets of rotor mechanisms 5 are respectively driven by independent motors 14, that is, one motor 14 drives one rotor shaft 51 in one set of rotor mechanism 5, and one motor 14 drives one rotor shaft 51 in the other set of rotor mechanism 5, and the two rotor shafts 51 are independently driven, which is conducive to reducing the power required by the motor 14, and the power of the motor 14 is half of the existing conventional motor power of the corresponding speed vacuum pump. The double-motor scheme is obviously smaller in size than the single-motor scheme, which is very advantageous for reducing the overall volume of the screw vacuum pump. Since the rotor shaft 51 is independently driven by the motor 14, the two protection gears 24 in the two sets of rotor mechanisms 5 are not in contact and do not mesh, and only play a protection role.

[0034] The motor shell 1 in the embodiment comprises a first bearing 11 and a bearing seat 12, the bearing seat 12 is fixed on the other end of the motor shell 1, and the rear end of the rotor shaft 51 is installed on the bearing seat 12 through the first bearing 11; the gear box 2 comprises a second bearing 22, the other end of the gear box 2 is provided with a bearing hole 21, the second bearing 22 is installed in the bearing hole 21, and the middle part of the rotor shaft 51 is installed on the second bearing 22. It can be seen that the rotor 54 forms a cantilever structure, and the first bearing 11 and the second bearing 22 are both not in contact with the pump shell 3, so that the pump shell 3 can be disassembled without disassembling the first bearing 11 and the second bearing 22 when the pump shell 3 is disassembled, and the pump shell 3 is very convenient to disassemble, which is convenient for cleaning and maintenance of the rotor 54.

[0035] The rotor shaft 51 in the embodiment is hollow, and the rotor shaft cooling channel 55 is arranged in the rotor shaft 51. The bearing seat 12 is provided with a cooling liquid input hole 13, which is an external cooling liquid inlet of a driving pump. The cooling liquid input hole 13 is communicated with the head of the rotor shaft cooling channel 55. The shaft sleeve pipe 52 is hollow, and the shaft sleeve cooling channel 56 is arranged in the shaft sleeve pipe 52. The head of the shaft sleeve cooling channel 56 is communicated with the tail of the rotor shaft cooling channel 55. The shaft sleeve 53 is provided with the shaft sleeve cavity 57, and the head of the shaft sleeve cavity 57 is communicated with the tail of the shaft sleeve cooling channel 56. The rotor 54 is hollow, and the front end of the rotor 54 is provided with the cover 59.

[0036] The rotor front cooling cavity 71 is formed between the outer wall of the shaft sleeve 53 and the inner wall of the rotor 54. The rotor rear cooling cavity 72 is formed between the outer wall of the front part of the rotor shaft 51 and the inner wall of the rotor 54. The cooling liquid backflow cavity 73 is formed between the outer wall of the rear half of the shaft sleeve pipe 52 and the inner wall of the rotor shaft 51.

[0037] The tail of the shaft sleeve 53 is provided with the shaft sleeve hole 61, and the tail of the shaft sleeve cavity 57 is communicated with the head of the rotor front cooling cavity 71 through the shaft sleeve hole 61. The front end of the rotor shaft 51 is provided with the horizontal rotor shaft cooling liquid inlet hole 62, and the tail of the rotor front cooling cavity 71 is communicated with the head of the rotor rear cooling cavity 72 through the rotor shaft cooling liquid inlet hole 62. The rotor shaft 51 is provided with the rotor shaft radial through hole 63, and the tail of the rotor rear cooling cavity 72 is communicated with the head of the cooling liquid backflow cavity 73 through the rotor shaft radial through hole 63. The rotor shaft 51 is provided with the rotor shaft cooling liquid backflow hole 64, and the protective gear 24 is provided with the gear cooling liquid backflow hole 65. The gear cooling liquid backflow hole 65 is aligned with the rotor shaft cooling liquid backflow hole 64. The tail of the cooling liquid backflow cavity 73 is communicated with the gear box cavity 23 in the gear box 2 through the rotor shaft cooling liquid backflow hole 64 and the gear cooling liquid backflow hole 65 in sequence. The bottom of the gear box 2 is provided with a cooling liquid output hole.

[0038] The rotor front cooling cavity 71, the rotor rear cooling cavity 72 and the cooling liquid backflow cavity 73 in the embodiment are all circular ring structures, which make the cooling liquid have more sufficient heat exchange area with the rotor 54 in the cavities. The number of the shaft sleeve holes 61 on the shaft sleeve 53 is 4-8. The number of the rotor shaft cooling liquid inlet holes 62, the number of the rotor shaft radial through holes 63 and the number of the rotor shaft cooling liquid backflow holes 64 on the rotor shaft 51 are all 4-8. The number of the gear cooling liquid backflow holes 65 on the protective gear 24 is equal to the number of the rotor shaft cooling liquid backflow holes 64.

[0039] The rotor cooling method of the rotor built-in cooling double-motor screw vacuum pump in the embodiment is as follows: the cooling liquid for cooling enters the cooling liquid input hole 13 through the external driving pump, the pumping flow rate of the cooling liquid is usually designed as 0.1-1 m / s, and the cooling liquid sequentially passes through the rotor shaft cooling channel 55, the shaft sleeve cooling channel 56, the shaft sleeve cavity 57, the shaft sleeve hole 61, the rotor front cooling cavity 71, the rotor shaft cooling liquid inlet hole 62, the rotor rear cooling cavity 72, the rotor shaft radial through hole 63, the cooling liquid return cavity 73 and the rotor shaft cooling liquid return hole 64 to form a cooling liquid channel, and then enters the gear box cavity 23 of the gear box 2 through the gear cooling liquid return hole 65, and flows out from the cooling liquid output hole of the gear box 2, the cooling liquid output hole is arranged at the bottom of the gear box 2 and connected with the driving pump, thereby forming a whole cooling liquid circulation loop, so that the whole rotor assembly is effectively cooled from inside to outside. Usually, the whole cooling liquid circulation loop flows from the exhaust side of the screw vacuum pump, passes through the intake side of the screw vacuum pump, and is finally discharged from the exhaust side, so that the exhaust side with higher temperature is double-cooled, the temperature of the rotor 54 is more balanced, and the cooling effect is better.

[0040] The thickness of the rotor front cooling cavity 71, the rotor rear cooling cavity 72 and the cooling liquid return cavity 73 in the embodiment is relatively narrow, and the hole diameter of the shaft sleeve hole 61, the rotor shaft cooling liquid inlet hole 62, the rotor shaft radial through hole 63, the rotor shaft cooling liquid return hole 64 and the gear cooling liquid return hole 65 is relatively large, which is beneficial to the rapid flow of the cooling liquid in different cavities and is beneficial to improving the cooling effect.

[0041] In addition, it should be noted that the specific embodiments described in the specification, the shape of the components, the name taken, etc. can be different, and the above described in the specification is only an example of the structure of the utility model. Any equivalent change or simple change made according to the structure, features and principles described in the utility model patent concept is included in the protection scope of the utility model patent. The person skilled in the art of the utility model can make various modifications or supplements or adopt similar ways to replace the described specific embodiments, as long as it does not deviate from the structure of the utility model or exceed the range defined by the claims, and it should belong to the protection scope of the utility model.

Claims

1. A dual motor screw vacuum pump with built-in cooling rotor, comprising a motor shell (1), a gear box (2), a pump shell (3) and a front end cover (4), one end of the motor shell (1) and one end of the gear box (2) are fixed, the other end of the gear box (2) and one end of the pump shell (3) are fixed, the front end cover (4) is fixed at the other end of the pump shell (3), characterized in that: Also include two sets of rotor mechanism (5), each set of rotor mechanism (5) includes rotor assembly, motor (14) and protective gear (24), one end of the rotor assembly is installed in the motor housing (1) on the other end, the middle part of the rotor assembly is installed in the gear box (2) on the other end, the front half of the rotor assembly is cantilever structure and located in the pump housing (3), the motor (14) is installed on the rotor assembly, the motor (14) is located in the motor housing (1), the protective gear (24) is installed on the rotor assembly, the protective gear (24) is located in the gear box (2), the inside of the rotor mechanism (5) is provided with cooling liquid channel; Two sets of rotor mechanism (5) are installed side by side.

2. The dual motor screw vacuum pump with rotor-in-can cooling of claim 1, wherein: The rotor assembly includes rotor shaft (51), shaft sleeve (52), shaft sleeve (53) and rotor (54), the front half of the rotor shaft (51) is sleeved in the rear half of the rotor (54), and the shaft sleeve installation cavity (58) is formed between the front end of the rotor shaft (51) and the front end of the rotor (54), the shaft sleeve (53) is fixed on the front end of the rotor shaft (51), and the shaft sleeve (53) is located in the shaft sleeve installation cavity (58); The shaft sleeve (52) is sleeved in the rotor shaft (51) and located in the front half of the rotor shaft (51); The motor (14) and the protective gear (24) are directly installed on the rotor shaft (51); Two rotors (54) in two sets of rotor mechanism (5) cooperate.

3. A rotor-injected-cooled dual-motor screw vacuum pump according to claim 2, characterized in that: The motor housing (1) includes a bearing (11) and a bearing seat (12), the bearing seat (12) is fixed on the other end of the motor housing (1), and the rear end of the rotor shaft (51) is installed on the bearing seat (12) through the bearing (11); The gear box (2) includes a second bearing (22), the gear box (2) is provided with a bearing hole (21) on the other end, the second bearing (22) is installed in the bearing hole (21), and the middle part of the rotor shaft (51) is installed on the second bearing (22).

4. A rotor-injected cooled dual-motor screw vacuum pump according to claim 2 or 3, characterized in that: The rotor shaft (51) is hollow structure, the rotor shaft (51) is provided with rotor shaft cooling channel (55); The shaft sleeve (52) is hollow structure, the shaft sleeve (52) is provided with shaft sleeve cooling channel (56), and the head of the shaft sleeve cooling channel (56) and the tail of the rotor shaft cooling channel (55) are communicated; The shaft sleeve (53) is provided with shaft sleeve cavity (57), and the head of the shaft sleeve cavity (57) and the tail of the shaft sleeve cooling channel (56) are communicated; The rotor (54) is hollow structure, and the front end of the rotor (54) is provided with a cover (59).

5. The rotor-injected-cooled dual-motor screw vacuum pump of claim 3, wherein: The bearing seat (12) is provided with a cooling liquid input hole (13), and the cooling liquid input hole (13) and the head of the rotor shaft cooling channel (55) in the rotor shaft (51) are communicated.

6. A rotor-injected-cooled dual-motor screw vacuum pump according to claim 5, characterized in that: The outer wall of the shaft sleeve (53) and the inner wall of the rotor (54) form a rotor front cooling cavity (71), the outer wall of the front part of the rotor shaft (51) and the inner wall of the rotor (54) form a rotor rear cooling cavity (72), and the outer wall of the rear half of the shaft sleeve tube (52) and the inner wall of the rotor shaft (51) form a cooling liquid return cavity (73).

7. A rotor-injected-cooled dual-motor screw vacuum pump according to claim 6, characterized in that: The tail of the shaft sleeve (53) is provided with a shaft sleeve hole (61), the tail of the shaft sleeve cavity (57) and the head of the rotor front cooling cavity (71) are communicated through the shaft sleeve hole (61); the front end of the rotor shaft (51) is provided with a horizontal rotor shaft cooling liquid inlet hole (62), the tail of the rotor front cooling cavity (71) and the head of the rotor rear cooling cavity (72) are communicated through the rotor shaft cooling liquid inlet hole (62); the rotor shaft (51) is provided with a rotor shaft radial through hole (63), the tail of the rotor rear cooling cavity (72) and the head of the cooling liquid return cavity (73) are communicated through the rotor shaft radial through hole (63); the rotor shaft (51) is provided with a rotor shaft cooling liquid return hole (64), the guard gear (24) is provided with a gear cooling liquid return hole (65), the gear cooling liquid return hole (65) and the rotor shaft cooling liquid return hole (64) are aligned, and the tail of the cooling liquid return cavity (73) is sequentially communicated with the gear box (2) through the rotor shaft cooling liquid return hole (64) and the gear cooling liquid return hole (65); the bottom of the gear box (2) is provided with a cooling liquid outlet hole.

8. A rotor-injected-cooled dual-motor screw vacuum pump according to claim 7, characterized in that: The rotor front cooling cavity (71), the rotor rear cooling cavity (72) and the cooling liquid return cavity (73) are all circular ring structures; the number of the shaft sleeve holes (61) on the shaft sleeve (53) is 4-8, the number of the rotor shaft cooling liquid inlet holes (62), the number of the rotor shaft radial through holes (63) and the number of the rotor shaft cooling liquid return holes (64) on the rotor shaft (51) are all 4-8, and the number of the gear cooling liquid return holes (65) on the guard gear (24) is equal to the number of the rotor shaft cooling liquid return holes (64).

9. A rotor-injected, dual motor screw vacuum pump according to claim 2 or 3, characterized in that: The material of the rotor (54) is aluminum, magnesium-aluminum alloy or titanium alloy, and the material of the pump housing (3) is aluminum, magnesium-aluminum alloy or titanium alloy.

10. A rotor-injected, dual motor screw vacuum pump according to claim 2 or 3, characterized in that: The guard gear (24) is fixed on the rotor shaft (51) through a key (25).

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