阅读说明：本技术 无油真空泵 (Oil-free vacuum pump ) 是由 姚宾勇 于 2020-12-02 设计创作，主要内容包括：本发明属于真空泵技术领域,具体涉及无油真空泵,包括第一安装壳、第二安装壳、双轴电机和两个气缸,第一安装壳的内部和第二安装壳的内部均设置有轴承安装架,双轴电机的两个输出轴套设有第一轴承,第一轴承设置于轴承安装架,双轴电机的两个输出轴还设置有转动座和散热风扇,转动座和气缸之间设置有连杆,连杆的顶部伸入气缸的内部,气缸的顶部盖设有阀板,气缸内设置有活塞,活塞设置于连杆的顶部和阀板之间。本发明运行稳定性好,散热效率高,其结构紧凑,容量大,能够满足同时持续抽吸和排放的工作强度。(The invention belongs to the technical field of vacuum pumps, and particularly relates to an oil-free vacuum pump which comprises a first mounting shell, a second mounting shell, a double-shaft motor and two cylinders, wherein bearing mounting frames are arranged inside the first mounting shell and inside the second mounting shell, two output shafts of the double-shaft motor are sleeved with first bearings, the first bearings are arranged on the bearing mounting frames, two output shafts of the double-shaft motor are also provided with a rotating seat and a radiating fan, a connecting rod is arranged between the rotating seat and the cylinders, the top of the connecting rod extends into the cylinders, a valve plate is arranged on a top cover of the cylinders, pistons are arranged in the cylinders, and the pistons are arranged between the top of the connecting rod and the valve. The invention has good operation stability, high heat dissipation efficiency, compact structure and large capacity, and can meet the working strength of continuous suction and discharge at the same time.)

1. Oil-free vacuum pump, its characterized in that: the device comprises a first mounting shell (1), a second mounting shell (2), a double-shaft motor (3) and two cylinders (4), wherein the two cylinders (4) are respectively arranged on the first mounting shell (1) and the second mounting shell (2);

two output shafts (31) of the double-shaft motor (3) are respectively sleeved with a first bearing (5), a rotating seat (6) and a cooling fan (7), bearing mounting frames (8) are respectively arranged inside the first mounting shell (1) and the second mounting shell (2), and the first bearings (5) are arranged on the bearing mounting frames (8);

the rotating base (6) comprises a rotating part (61) and a deflection part (62) which are integrally formed, the deflection part (62) is sleeved on the end part of the rotating part (61), and the shaft hole (71) of the heat dissipation fan (7) and the rotating part (61) are respectively sleeved on the output shaft (31) of the double-shaft motor (3);

the rotating part (61) is sleeved with a second bearing (9), a connecting rod (10) is arranged between the second bearing (9) and the cylinder (4), the bottom of the connecting rod (10) is sleeved on the second bearing (9), and the top of the connecting rod (10) extends into the cylinder (4);

the top cover of cylinder (4) is equipped with valve plate (11), be provided with piston (41) in cylinder (4), piston (41) set up in the top of connecting rod (10) with between valve plate (11).

2. An oil-free vacuum pump as claimed in claim 1, wherein:

a motor heat dissipation shell (12) is arranged between the first mounting shell (1) and the second mounting shell (2), and the motor heat dissipation shell (12) is respectively connected with the first mounting shell (1) and the second mounting shell (2);

the motor heat dissipation shell (12) is provided with heat dissipation holes (120), and the heat dissipation holes (120) are arranged around the motor heat dissipation shell (12).

3. An oil-free vacuum pump as claimed in claim 2, wherein:

a heat dissipation cavity is arranged between the bearing mounting rack (8) of the first mounting shell (1) and the bearing mounting rack (8) of the second mounting shell (2), and the heat dissipation holes (120) are communicated with the heat dissipation cavity;

bearing mounting bracket (8) of first installation shell (1) with bearing mounting bracket (8) of second installation shell (2) all are provided with a plurality of supports (81), and are a plurality of be formed with heat dissipation channel (82) between support (81), the heat dissipation chamber communicate in heat dissipation channel (82).

4. An oil-free vacuum pump as claimed in claim 3, wherein:

the left side and the right side of the bearing mounting frame (8) of the first mounting shell (1) are respectively provided with a first air hole (101) and a second air hole (102);

the left side and the right side of the bearing mounting frame (8) of the second mounting shell (2) are respectively provided with a third air hole (201) and a fourth air hole (202);

the second air hole (102) and the third air hole (201) are communicated with the heat dissipation cavity.

5. An oil-free vacuum pump as claimed in claim 1, wherein:

the side part of the first mounting shell (1) and the side part of the second mounting shell (2) are both provided with a heat dissipation cover (13) corresponding to the heat dissipation fan (7);

the heat radiation fan (7) is arranged between the rotating seat (6) and the heat radiation cover (13);

the fan blades (72) of the heat radiation fan (7) are used for blowing air to the rotating seat (6) and the double-shaft motor (3);

the rotating seat (6) and the heat dissipation fan (7) are arranged between the bearing mounting frame (8) and the heat dissipation cover (13).

6. An oil-free vacuum pump as claimed in claim 1, wherein:

the first mounting shell (1) and the second mounting shell (2) are both provided with a top cover (14), and the top cover (14) is provided with a plurality of heat dissipation prismatic grooves (140);

a first sealing ring (141) is arranged at the bottom of the top cover (14), and the first sealing ring (141) is used for sealing an upper positioning groove (111) of the valve plate (11);

the top cover (14) of the first mounting shell (1) is communicated with the top cover (14) of the second mounting shell (2) through a conduit (15).

7. An oil-free vacuum pump as claimed in claim 6, wherein:

the valve plate (11) is arranged between the top cover (14) and the cylinder (4), and a second sealing ring (113) for sealing the cylinder (4) is arranged in a lower positioning groove (112) of the valve plate (11);

the top of first installation shell (1) and the top of second installation shell (2) all are provided with heat dissipation frame (16), cylinder (4) set up in heat dissipation frame (16).

8. An oil-free vacuum pump as claimed in claim 6, wherein: the top cover (14), the valve plate (11), the piston (41) and the guide pipe (15) are all attached with hard oxide layers.

9. An oil-free vacuum pump as claimed in claim 6, wherein: valve plate (11) are provided with first valve opening (114) and second valve opening (115), piston (41) be provided with respectively with first valve opening (114) with the hole of dodging (410) that second valve opening (115) correspond, first valve opening (114) with be provided with the diameter between second valve opening (115) and be 1mm ~ 2 mm's round hole.

10. An oil-free vacuum pump as claimed in claim 7, wherein: the top of cylinder (4) is provided with valve plate fixing base (17), valve plate (11) install in valve plate fixing base (17).

Technical Field

The invention belongs to the technical field of vacuum pumps, and particularly relates to an oil-free vacuum pump.

Background

The vacuum pump is a device or equipment for obtaining vacuum by pumping a pumped container by using a mechanical, physical, chemical or physical-chemical method, and basically can be divided into two types, namely a gas capture pump and a gas transmission pump according to the working principle of the vacuum pump, and the vacuum pump is widely applied to industries such as metallurgy, chemical engineering, food, electronic coating and the like.

However, the inventors have found that the conventional vacuum pump has low operation stability, a small capacity, and inflexible operation of a motor, and also has large heat accumulation in the vacuum pump, low heat dissipation efficiency, and failure to efficiently diffuse heat, and is liable to affect the normal operation of the vacuum pump, and that the conventional vacuum pump has low compatibility among components, and each component lacks functional support for other components, so that the vacuum pump cannot perform its entire function. Therefore, a new vacuum pump is needed to solve the above problems.

Disclosure of Invention

The invention aims to: the oil-free vacuum pump has the advantages of high reliability, good stability, high heat dissipation efficiency, strong universality, compact structure and large capacity, and can meet the working strength of continuous pumping and discharging.

In order to achieve the purpose, the invention adopts the following technical scheme:

oilless vacuum pump, including first installation shell, second installation shell, double-shaft motor and two cylinders, two the cylinder set up respectively in first installation shell with the second installation shell, two output shaft of double-shaft motor all overlaps and is equipped with first bearing, rotation seat and radiator fan, the inside of first installation shell with the inside of second installation shell all is provided with the bearing mounting bracket, first bearing sets up in the bearing mounting bracket, the rotation seat includes integrated into one piece's rotating part and deflection portion, the deflection portion cover is located the tip of rotating part, radiator fan's shaft hole the rotating part overlaps respectively and is located the output shaft of double-shaft motor, the rotating part cover is equipped with the second bearing, the second bearing with be provided with the connecting rod between the cylinder, the bottom cover of connecting rod is located the second bearing, the top of connecting rod stretches into the inside of cylinder, the top lid of cylinder is equipped with the valve plate, be provided with the piston in the cylinder, the piston set up in the top of connecting rod with between the valve plate.

Further, be provided with the motor heat dissipation shell between first installation shell and the second installation shell, the motor heat dissipation shell respectively with first installation shell with the second installation shell is connected, the motor heat dissipation shell is provided with the louvre, and a plurality of louvres center on the motor heat dissipation shell sets up, the biax motor install in the motor heat dissipation shell, make the biax motor can follow in the operation process the week side of motor heat dissipation shell is evenly dispelled the heat.

Further, be provided with the heat dissipation chamber between the bearing mounting bracket of first installation shell and the bearing mounting bracket of second installation shell, it is a plurality of the louvre communicate in the heat dissipation chamber makes the heat that the heat dissipation chamber was gathered can be from a plurality of the louvre is discharged, the bearing mounting bracket of first installation shell with the bearing mounting bracket of second installation shell all is provided with a plurality of supports, and is a plurality of be formed with heat dissipation channel between the support, the heat dissipation chamber communicate in heat dissipation channel, heat dissipation channel is fan-shaped, heat dissipation channel can increase the inside heat radiating area of vacuum pump.

Further, the left and right sides of the bearing mounting bracket of first installation shell is provided with first bleeder vent and second bleeder vent respectively, the left and right sides of the bearing mounting bracket of second installation shell is provided with third bleeder vent and fourth bleeder vent respectively, the second bleeder vent with the third bleeder vent all with heat dissipation chamber intercommunication makes first installation shell the second installation shell the bearing mounting bracket with the motor heat dissipation shell all has the radiating performance of coordination of mutually supporting, has improved the whole radiating efficiency of vacuum pump effectively.

Further, the lateral part of first installation shell with the lateral part of second installation shell all is provided with the cooling lid that radiator fan corresponds, radiator fan set up in rotate the seat with between the cooling lid, radiator fan's flabellum is used for to rotate the seat with the biax motor is bloied, rotate the seat with radiator fan all set up in the bearing mounting bracket with between the cooling lid, the cooling lid is opened and is equipped with a plurality of logical grooves, and the radiating efficiency of vacuum pump can be accelerated in a plurality of logical grooves.

Further, first installation shell with the second installation shell all is provided with the top cap, the top cap is provided with a plurality of heat dissipation arris grooves, the width in heat dissipation arris groove is 20mm ~ 40mm, the bottom of top cap is provided with first sealing washer, first sealing washer is used for sealing the last constant head tank of valve plate, the top cap of first installation shell with the top cap of second installation shell passes through the pipe intercommunication.

Further, the valve plate set up in the top cap with between the cylinder, the lower constant head tank of valve plate is provided with and is used for sealing the second sealing washer of cylinder, the top of first installation shell with the top of second installation shell all is provided with the heat dissipation frame, the cylinder set up in the heat dissipation frame, the lateral part of heat dissipation frame is provided with a plurality of flutings that are used for the radiating, can ensure the high-efficient heat dissipation of cylinder.

Furthermore, hard oxide layers are attached to the top cover, the valve plate, the piston and the guide pipe, the thickness of each hard oxide layer is 1 cm-3 cm, the hard oxide layers are used for improving the corrosion resistance and the wear resistance of each part and prolonging the service life of each part, and the purity of compressed air sucked by the vacuum pump is kept.

Further, the valve plate is provided with suction valve and discharge valve, the valve plate is provided with first valve opening and second valve opening, the piston be provided with respectively with first valve opening with the hole of dodging that the second valve opening corresponds, thereby ensured the operational safety of piston, and, first valve opening with be provided with the diameter between the second valve opening and be 1mm ~ 2 mm's round hole, the function that the pressure was started can be realized to the round hole, when vacuum pump and other equipment are connected promptly to keeping under the condition of certain pressure, can making the vacuum pump can start the operation at any time under the condition of vacuum pump pipeline and acceptor area negative pressure.

Further, the top of cylinder is provided with the valve plate fixing base, the valve plate fixing base set up in the cylinder with between the top cap, the valve plate install in the valve plate fixing base, the valve plate fixing base is used for improving the installation stability of valve plate.

The invention has the beneficial effects that: 1) when the first bearing is arranged on the bearing mounting frame, the output operation of the two output shafts of the double-shaft motor is more stable and reliable due to the fixed supporting function of the bearing mounting frame, so that the output shafts of the double-shaft motor can rotate efficiently without interference; 2) the rotating seat comprises a rotating part and a deflection part which are integrally formed, the deflection part is sleeved at the end part of the rotating part, a shaft hole of the cooling fan and the rotating part are respectively sleeved on output shafts of the double-shaft motor, the rotating part is sleeved with a second bearing, a connecting rod is arranged between the second bearing and the air cylinder, the bottom of the connecting rod is sleeved on the second bearing, when the output shafts of the double-shaft motor drive the rotating part to rotate circumferentially, the second bearing sleeved on the rotating part and the connecting rod connected with the second bearing can realize up-and-down reciprocating motion under the action of centrifugal deflection of the deflection part, and meanwhile, the connecting rod, the second bearing, the output shafts of the double-shaft motor of the rotating part and the deflection part are good in; 3) the heat dissipation fan rotates along with the two output shafts of the double-shaft motor, so that the bearing mounting frame, the rotating seat and the double-shaft motor are effectively and efficiently dissipated, the operation temperature of the motor is reduced, and the motor can efficiently and continuously work; 4) two cylinders set up respectively in first installation shell and second installation shell, and the capacity of cylinder is big, can make the vacuum pump satisfy the working strength who lasts suction and discharge simultaneously.

Drawings

Fig. 1 is an exploded view of embodiment 1 of the present invention.

Fig. 2 is an exploded schematic view of a biaxial motor, a rotary base, a heat radiation fan, a second bearing, and a link according to embodiment 1 of the present invention.

Fig. 3 is an exploded view of the first mounting case, the second mounting case, and the motor heat dissipation case in embodiment 1 of the present invention.

Fig. 4 is one of the schematic structural views of the valve plate according to embodiment 1 of the present invention.

Fig. 5 is a second schematic structural view of the valve plate according to embodiment 1 of the present invention.

Fig. 6 is a schematic structural view of a piston according to embodiment 1 of the present invention.

Wherein: 1-a first mounting housing; 2-a second mounting housing; 3-a two-shaft motor; 4-a cylinder; 5-a first bearing; 6-rotating the seat; 7-a heat dissipation fan; 8-a bearing mounting frame; 9-a second bearing; 10-a connecting rod; 11-a valve plate; 12-a motor heat dissipation shell; 13-a heat dissipation cover; 14-a top cover; 15-a catheter; 16-a heat dissipation frame; 17-valve plate fixing seat; 31-an output shaft; 41-a piston; 61-a rotating part; 62-a deflection section; 71-axle hole; 72-fan blades; 81-bracket; 82-heat dissipation channels; 101-a first vent; 102-a second vent; 111-upper positioning groove; 112-lower positioning groove; 113-a second seal ring; 114-a first valve orifice; 115-a second valve opening; 120-heat dissipation holes; 140-heat dissipation edge grooves; 141-a first seal ring; 201-third air holes; 202-fourth vent; 410-avoiding holes.

Detailed Description

As used in this specification and the appended claims, certain terms are used to refer to particular components, and it will be appreciated by those skilled in the art that a manufacturer may refer to a component by different names. This specification and claims do not intend to distinguish between components that differ in name but not function. In the following description and in the claims, the terms "include" and "comprise" are used in an open-ended fashion, and thus should be interpreted to mean "include, but not limited to. "substantially" means within an acceptable error range, and a person skilled in the art can solve the technical problem within a certain error range to substantially achieve the technical effect.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", horizontal ", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.

In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

The present invention will be described in further detail with reference to the accompanying drawings 1 to 6 and specific examples, but the present invention is not limited thereto.

Example 1

An oilless vacuum pump, as shown in fig. 1, comprises a first mounting housing 1, a second mounting housing 2, a dual-shaft motor 3 and two cylinders 4, wherein the two cylinders 4 are respectively arranged on the first mounting housing 1 and the second mounting housing 2, as shown in fig. 2, two output shafts 31 of the dual-shaft motor 3 are respectively sleeved with a first bearing 5, a rotating base 6 and a heat dissipation fan 7, bearing mounting frames 8 are respectively arranged inside the first mounting housing 1 and inside the second mounting housing 2, the first bearing 5 is arranged on the bearing mounting frames 8, wherein the rotating base 6 comprises a rotating part 61 and a deflecting part 62 which are integrally formed, the deflecting part 62 is sleeved on an end part of the rotating part 61, a shaft hole 71 of the heat dissipation fan 7 and the rotating part 61 are respectively sleeved on the output shaft 31 of the dual-shaft motor 3, the rotating part 61 is sleeved with a second bearing 9, a connecting rod 10 is arranged between the second bearing 9 and the cylinders 4, a bottom, the rotating part 61 drives the second bearing 9 and the connecting rod 10 to reciprocate up and down in the rotating process, meanwhile, the top of the connecting rod 10 extends into the inside of the cylinder 4, the top cover of the cylinder 4 is provided with a valve plate 11, the valve plate 11 is provided with a suction valve and an exhaust valve, a piston 41 is arranged in the cylinder 4, the piston 41 is arranged between the top of the connecting rod 10 and the valve plate 11, the piston 41 is driven at the top of the connecting rod 10, the cylinder 4 and the valve plate 11 cyclically realize suction gas and exhaust gas, and therefore the vacuum pumping effect of the vacuum pump is achieved.

And, in order to improve the radiating efficiency of biax motor 3, be provided with motor heat dissipation shell 12 between first installation shell 1 and second installation shell 2, motor heat dissipation shell 12 is connected with first installation shell 1 and second installation shell 2 respectively, and motor heat dissipation shell 12 is provided with louvre 120, and a plurality of louvres 120 set up around motor heat dissipation shell 12, and a plurality of louvres 120 distribute evenly in motor heat dissipation shell 12's week side, and it is stable to have promoted the heat dissipation cooling when biax motor 3 moves.

Preferably, a heat dissipation cavity is formed between the bearing mounting frame 8 of the first mounting shell 1 and the bearing mounting frame 8 of the second mounting shell 2, and the plurality of heat dissipation holes 120 are communicated with the heat dissipation cavity, as shown in fig. 3, the bearing mounting frame 8 of the first mounting shell 1 and the bearing mounting frame 8 of the second mounting shell 2 are both provided with a plurality of supports 81, a plurality of heat dissipation channels 82 are formed between the plurality of supports 81, the heat dissipation cavity is communicated with the plurality of heat dissipation channels 82, and the heat dissipation channels 82 are fan-shaped, so that the heat dissipation area inside the vacuum pump can be increased.

Preferably, in order to improve the heat dissipation coordination performance of the first mounting shell 1, the second mounting shell 2, the bearing mounting rack 8 and the motor heat dissipation shell 12 and the overall heat dissipation performance of the vacuum pump, the left side and the right side of the bearing mounting rack 8 of the first mounting shell 1 are respectively provided with a first vent hole 101 and a second vent hole 102, the left side and the right side of the bearing mounting rack 8 of the second mounting shell 2 are respectively provided with a third vent hole 201 and a fourth vent hole 202, the second vent hole 102 and the third vent hole 201 are both communicated with the heat dissipation cavity, wherein the size of the first vent hole 101 is equal to the size of the fourth vent hole 202, the size of the second vent hole 102 is equal to the size of the third vent hole 201, the aperture of the second vent hole 102 is larger than that of the first vent hole 101, each vent hole is smooth to the outside, and all components and each area of the vacuum.

And, the lateral part of first installation shell 1 and the lateral part of second installation shell 2 all are provided with radiator cap 13 corresponding with radiator fan 7, radiator fan 7 sets up and rotates between seat 6 and radiator cap 13, radiator fan 7's flabellum 72 is used for rotating seat 6 and biaxial motor 3 and blowing, it all sets up between bearing mounting bracket 8 and radiator cap 13 to rotate seat 6 and radiator fan 7, simultaneously, flabellum 72 is inwards blown, can promote the high-efficient heat dissipation who rotates seat 6, bearing mounting bracket 8, second bearing 9, connecting rod 10, first bearing 5 and biaxial motor 3.

Preferably, the first mounting case 1 and the second mounting case 2 have the same structure, the first mounting case 1 and the second mounting case 2 are both provided with the top cover 14, the top cover 14 is provided with a plurality of heat dissipation grooves 140, the width of the heat dissipation grooves 140 is 20mm to 40mm, the plurality of heat dissipation grooves 140 are used for improving the heat dissipation efficiency of the top cover 14, the bottom of the top cover 14 is provided with a first sealing ring 141, the first sealing ring 141 is used for sealing the upper positioning groove 111 of the valve plate 11, and the top cover 14 of the first mounting case 1 and the top cover 14 of the second mounting case 2 can be communicated through the conduit 15.

Meanwhile, the valve plate 11 is arranged between the top cover 14 and the air cylinder 4, the lower positioning groove 112 of the valve plate 11 is provided with a second sealing ring 113 for sealing the air cylinder 4, the top of the first mounting shell 1 and the top of the second mounting shell 2 are both provided with a heat dissipation frame 16, the air cylinder 4 is arranged in the heat dissipation frame 16, and the heat dissipation frame 16 promotes the heat dissipation of the air cylinder 4.

As shown in fig. 4 to 5, the valve plate 11 is provided with a first valve hole 114 and a second valve hole 115, and a circular hole with a diameter of 1mm to 2mm is provided between the first valve hole 114 and the second valve hole 115, and the circular hole can realize the function of starting under pressure, that is, when the vacuum pump is connected with other equipment and a certain pressure is maintained, the vacuum pump can be started and operated at any time under the condition that the vacuum pump pipeline and the receiver have negative pressure.

As shown in fig. 6, the piston 41 is provided with relief holes 410 corresponding to the first valve hole 114 and the second valve hole 115, respectively, and the relief holes 410 can avoid collision of the piston 41 with the valve plate 11, thereby ensuring safety of the piston 41 in operation in the cylinder 4.

In addition, in order to improve the installation stability of valve plate 11, the top of cylinder 4 is provided with valve plate fixing base 17, and valve plate fixing base 17 sets up between cylinder 4 and top cap 14, and valve plate 11 is installed in valve plate fixing base 17.

Example 2

The difference between the embodiment and embodiment 1 is that the top cover 14, the valve plate 11, the piston 41 and the conduit 15 are all adhered with hard oxide layers, the thickness of the hard oxide layers is 1 cm-3 cm, the hard oxide layers are used for improving the corrosion resistance and the wear resistance of each part and the service life of each part, and the purity of the air sucked by the vacuum pump after being compressed is maintained.

Other structures of this embodiment are the same as those of embodiment 1, and are not described herein again.

Example 3

The present embodiment is different from embodiment 1 in that the size of the first vent 101, the size of the second vent 102, the size of the third vent 201, and the size of the fourth vent 202 are equal, and each vent is smoothly ventilated with the outside, so that each component and each area of the vacuum pump can efficiently dissipate heat.

Other structures of this embodiment are the same as those of embodiment 1, and are not described herein again.

Example 4

The difference between this embodiment and embodiment 1 is that the top of connecting rod 10 is still overlapped and is equipped with the leak protection air cushion that adopts high temperature resistant, the material of stand wear and tear to make, leak protection air cushion butt in the inside wall of cylinder 4, at connecting rod 10 up-and-down reciprocating motion's in-process, the gas tightness of connecting rod 10's top and the inside wall contact of cylinder 4 is good, thereby ensured that cylinder 4 can bleed and breathe in with high accuracy, simultaneously, can directly change the leak protection air cushion when connecting rod 10 is maintained to needs, and need not maintain whole connecting rod 10, thereby can show ground and improve connecting rod 10's life and reduce the maintenance cost of vacuum pump effectively.

Other structures of this embodiment are the same as those of embodiment 1, and are not described herein again.

The working principle of the invention comprises: the double-shaft motor 3 drives the connecting rods 10 on the two output shafts 31 to reciprocate up and down, the two connecting rods 10 respectively drive the piston 41 in the cylinder 4 of the first mounting shell 1 and the piston 41 in the cylinder 4 of the second mounting shell 2, thereby making the piston 41 reciprocate and changing the pressure in the cylinder 4, and then making the valve plate at the top of the cylinder 4 finish air suction and air suction, the capacity of the two cylinders 4 is large, the vacuum pump can meet the working strength of continuous suction and discharge at the same time, and the vacuum pump can more flexibly select to realize suction and discharge, at the same time, the heat radiation fans 7 of the two output shafts 31 rotate along with the output shafts 31, continuously cool and radiate the double-shaft motor 3 when the vacuum pump realizes suction and discharge, ensure the stable and efficient operation of the vacuum pump, and moreover, the heat dissipation air duct in the vacuum pump is smoothly communicated with the outside, the vacuum pump dissipates heat quickly, and the operation safety of the vacuum pump is greatly improved.

Obviously, the invention effectively solves the problems of unstable operation of the motor and low heat dissipation efficiency of each component in the vacuum pump, has stable and reliable operation, high heat dissipation efficiency, strong universality, compact structure and large capacity, and can meet the working strength of continuous suction and discharge at the same time.

Variations and modifications to the above-described embodiments may also occur to those skilled in the art, which fall within the scope of the invention as disclosed and taught herein. Therefore, the present invention is not limited to the above-mentioned embodiments, and any obvious improvement, replacement or modification made by those skilled in the art based on the present invention is within the protection scope of the present invention. Furthermore, although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.