CN204025047U

CN204025047U - A kind of multi-stage roots vacuum pump

Info

Publication number: CN204025047U
Application number: CN201420087895.2U
Authority: CN
Inventors: 何文财
Original assignee: Dongguan City Ya Zhi Randt Electromechanical Technology Co Ltd
Current assignee: Dongguan City Ya Zhi Randt Electromechanical Technology Co Ltd
Priority date: 2014-02-28
Filing date: 2014-02-28
Publication date: 2014-12-17
Anticipated expiration: 2024-02-28

Abstract

The utility model relates to vacuum pump technology field, particularly relates to a kind of multi-stage roots vacuum pump.The utility model comprises the pump housing, and described pump body is provided with holding cavity, and holding cavity is provided with multiple dividing plate, and holding cavity is divided into multiple Roots chamber by dividing plate; The described pump housing also comprises rotating shaft, rotating shaft is arranged with the roots rotor matched in multiple Roots chamber, in two adjacent roots rotors, the blade quantity being arranged in the roots rotor in prime Roots chamber is less than or equals the blade quantity of the roots rotor being arranged in rear class Roots chamber.The utility model adopts the blade quantity increasing rotor, reaches the volume changing and can hold gas in Roots chamber, makes the processing of multi-stage roots pump become convenient, reduces costs.

Description

A kind of multi-stage roots vacuum pump

Technical field

The utility model relates to Roots pump technical field, particularly relates to a kind of multi-stage roots vacuum pump.

Background technique

Vacuum pump is widely used in the industries such as electronics, chemical industry, weaving, and according to the difference of user demand, adopt the combination of different vacuum pumps or multiple vacuum pump to obtain vacuum, current mechanical pump is when vacuumizing, and degree of vacuum can reach 10 ^-1pa; Therefore, when vacuum level requirement is not too high, general mechanical pump all can satisfy the demands; In order to reach good pumping speed, vacuum limit and without oiliness, generally all can adopt Roots pump, but the Roots pump of single-stage can not be used alone, generally can combinationally use with other mechanical pump; When combinationally using, can cause bulky, cost is higher; For this reason, people develop multistage Roots pump, and the Chinese invention being 200710012759.1 as application number is applied for a patent, and name is called: a kind of multi-stage roots dry vacuum pump of discharging directly into atmosphere, this multi-stage roots pump adopts multistage connected structure, and the length of pump chamber reduces successively from high vacuum.Although this multi-stage roots pump solves discharging directly into atmosphere, without wet goods problem, but the use progression of this multi-stage roots pump is limited, adopt the technology that length reduces successively, very little of the vane thickness in the Roots pump of outermost end certainly will be made, its difficulty of processing is increased, thus limits the expansion of Roots pump.Well can not improve vacuum limit.

Model utility content

The purpose of this utility model is to solve the deficiencies in the prior art, and provide a kind of multi-stage roots vacuum pump, this multi-stage roots vacuum pump can improve vacuum limit, and easy to process.

For achieving the above object, the technical solution adopted in the utility model is:

A kind of multi-stage roots vacuum pump, comprise the pump housing, described pump body is provided with holding cavity, and holding cavity is provided with multiple dividing plate, and holding cavity is divided into multiple Roots chamber by dividing plate; The described pump housing also comprises rotating shaft, rotating shaft is arranged with the roots rotor matched in multiple Roots chamber, in two adjacent roots rotors, the blade quantity being arranged in the roots rotor in prime Roots chamber is less than or equals the blade quantity of the roots rotor being arranged in rear class Roots chamber.

Further, in described two adjacent roots rotors, the external diameter being arranged in the roots rotor in prime Roots chamber is more than or equal to the external diameter of the roots rotor being arranged in rear class Roots chamber.

Further, in described two adjacent Roots chambeies, the thickness in prime Roots chamber is more than or equal to the thickness in rear class Roots chamber.

Further, the outlet port in Roots chamber is provided with the one-way valve for controlling gas flow.

Further, described rotating shaft comprises active rotating shaft and driven spindle, is provided with driving mechanism between active rotating shaft and driven spindle, and active rotating shaft drives driven spindle to rotate by driving mechanism and the sense of rotation of active rotating shaft and driven spindle is contrary.

Further, described driving mechanism comprises belt.

Further, described driving mechanism comprises driving gear and driven gear, and driving gear is sheathed on active rotating shaft, and driven gear is sheathed on driven spindle, and driving gear engages with driven gear.

Adopt gear transmission, sync rates is high; And structure is simple.

As equivalent variations, driving mechanism is chain wheel driving mechanism.Respectively drive sprocket and driven sprocket are set on active rotating shaft, driven spindle, are connected by chain.

The beneficial effect that the utility model obtains is: the utility model adopts the blade quantity increasing rotor, reaches the volume changing and can hold gas in Roots chamber, makes the processing of multi-stage roots pump become convenient, reduces costs.

Accompanying drawing explanation

Fig. 1 is a kind of sectional structure schematic diagram of the present utility model.

Fig. 2 be first order Roots chamber of the present utility model with roots rotor coordinate schematic diagram.

Fig. 3 be wherein one-level Roots pump of the present utility model with roots rotor coordinate schematic diagram.

Reference character is:

1---the pump housing 2---driven spindle 3---motor

4---coupling 5---active rotating shaft 6---roots rotors

7---gas channel 8---dividing plate 9---Roots chambeies.

Embodiment

Below in conjunction with the drawings and specific embodiments, book is described further to the utility model.

Embodiment: see Fig. 1 to Fig. 3.

A kind of multi-stage roots vacuum pump, comprise the pump housing 1, the described pump housing 1 inside is provided with holding cavity, and holding cavity is provided with multiple dividing plate 8, and holding cavity is divided into multiple Roots chamber 9 by dividing plate 8; The described pump housing 1 also comprises rotating shaft, rotating shaft is arranged with the roots rotor 6 matched in multiple Roots chamber 9, in two adjacent roots rotors 6, the blade quantity being arranged in the roots rotor 6 in prime Roots chamber 9 is less than or equals the blade quantity of the roots rotor 6 being arranged in rear class Roots chamber 9.

When multi-stage roots vacuum pump works, gas enters into first order Roots chamber 9 from the entrance of the pump housing 1, then the Roots pump of next stage is pushed into successively by compression, finally discharge from the outlet of the pump housing 1, in order to make the work of multi-stage roots vacuum pump multi-stage roots vacuum pump temperature, gas volume in multi-stage roots vacuum pump should successively successively decrease in multi-stage roots chamber 9, because the rotor of Roots pump 6 often rotates a circle, then arranges the gas of an inner gas volume size; Employing in the past progressively reduces the thickness in Roots chamber 9, thus reaches the volume reducing and hold gas in Roots chamber 9; But there will be the thickness also corresponding minimizing of rotor 6 simultaneously, cause rotor 6 thickness of afterbody very little, add manufacture difficulty and cost.And the technical program adopts the blade quantity increasing rotor 6, thus reach for holding the volume of gas in reduction Roots chamber 9, simultaneously easy to make.When specifically making, every grade of Roots pump is equipped with suction port and air outlet, and suction port is all positioned at the same side of the pump housing 1; Air outlet is positioned at the relative side of suction port; Be provided with gas channel 7 in the pump housing 1, the suction port of the air outlet of prime Roots pump with the Roots pump of rear class is connected by gas channel 7.

In addition, it should be noted that, each Roots chamber 9 forms a Roots pump with corresponding roots rotor 6, and each Roots pump is communicated with successively, with the entrance of the pump housing 1 together with Roots pump be first order Roots pump, the Roots pump identical with the outlet of the pump housing 1 is afterbody Roots pump.

Further, in described two adjacent roots rotors 6, the external diameter being arranged in the roots rotor 6 in prime Roots chamber 9 is more than or equal to the external diameter of the roots rotor 6 being arranged in rear class Roots chamber 9.

When reducing the volume for accommodating gas in rear class Roots pump successively, increasing except blade quantity except adopting, can also start with from minimizing Roots chamber 9 volume; Both combined, reach good effect, avoid the blade quantity occurring afterbody Roots pump too many, efficiency is low.

Further, in described two adjacent Roots chambeies 9, the thickness in prime Roots chamber 9 is more than or equal to the thickness in rear class Roots chamber 9.

In order to make the progression of multi-stage roots pump more, the method reducing Roots chamber 9 thickness can be adopted, reaching the volume reducing accommodating gas in Roots chamber 9.It is combined use with the former mode, the progression of Roots pump can be allowed most, obtain better vacuum.

Further, the outlet port in Roots chamber 9 is provided with the one-way valve for controlling gas flow.

One-way valve is set, the backflow of pressurized gas can be prevented the impact of roots rotor 6.

Wherein, described rotating shaft comprises active rotating shaft 5 and driven spindle 2, is provided with driving mechanism between active rotating shaft 5 and driven spindle 2, and active rotating shaft 5 drives driven spindle 2 to rotate by driving mechanism and the sense of rotation of active rotating shaft 5 and driven spindle 2 is contrary.Active rotating shaft 5 is connected by the rotating shaft of coupling 4 with motor 3, rotates under the drive of motor 3.

Further, described driving mechanism comprises belt.

Adopt belt transmission, structure is simple, and cost is low; During assembling, only need to overlap belt on active rotating shaft 5 and driven spindle 2.Certainly, as preferably, on active rotating shaft 5 and driven spindle 2, belt grooves can be set respectively, belt dropping or skidding can be prevented.

Further, described driving mechanism comprises driving gear and driven gear, and driving gear is sheathed on active rotating shaft 5, and driven gear is sheathed on driven spindle 2, and driving gear engages with driven gear.

Adopt gear transmission, sync rates is high; And structure is simple.

As equivalent variations, driving mechanism is chain wheel driving mechanism.Respectively drive sprocket and driven sprocket are set on active rotating shaft 5, driven spindle 2, are connected by chain.

Below be only the preferred embodiment of the application, equivalent technical solutions on this basis still falls into application protection domain.

Claims

1. a multi-stage roots vacuum pump, comprises the pump housing, and described pump body is provided with holding cavity, and holding cavity is provided with multiple dividing plate, and holding cavity is divided into multiple Roots chamber by dividing plate; The described pump housing also comprises rotating shaft, rotating shaft is arranged with the roots rotor matched in multiple Roots chamber, it is characterized in that: in two adjacent roots rotors, the blade quantity being arranged in the roots rotor in prime Roots chamber is less than the blade quantity of the roots rotor being arranged in rear class Roots chamber;

In described two adjacent roots rotors, the external diameter being arranged in the roots rotor in prime Roots chamber is more than or equal to the external diameter of the roots rotor being arranged in rear class Roots chamber;

In described two adjacent Roots chambeies, the thickness in prime Roots chamber is more than or equal to the thickness in rear class Roots chamber;

The outlet port in Roots chamber is provided with the one-way valve for controlling gas flow.

2. a kind of multi-stage roots vacuum pump according to claim 1, it is characterized in that: described rotating shaft comprises active rotating shaft and driven spindle, be provided with driving mechanism between active rotating shaft and driven spindle, active rotating shaft drives driven spindle to rotate by driving mechanism and the sense of rotation of active rotating shaft and driven spindle is contrary.

3. a kind of multi-stage roots vacuum pump according to claim 2, is characterized in that: described driving mechanism comprises belt.

4. a kind of multi-stage roots vacuum pump according to claim 3, is characterized in that: described driving mechanism comprises driving gear and driven gear, and driving gear is sheathed on active rotating shaft, and driven gear is sheathed on driven spindle, and driving gear engages with driven gear.