CN201050481Y

CN201050481Y - Mechanical seal leakage-free Root's vacuum pump

Info

Publication number: CN201050481Y
Application number: CNU2007200400423U
Authority: CN
Inventors: 陈全玉
Original assignee: Individual
Current assignee: Individual
Priority date: 2007-06-18
Filing date: 2007-06-18
Publication date: 2008-04-23
Anticipated expiration: 2017-06-18

Abstract

The utility model relates to a mechanical seal oil-free Roots vacuum pump, comprising a pump body (1), a main shaft (12), a rear end housing (2), a rear cover (3), a front end housing (15), a front cover (16) and a motor (22). Between the exserted part of the main shaft (12) and a shaft sealing gland (19), a mechanical seal 2 (20) is used for sealing. The mechanical seal 2 (20) consists of a moving sealing ring (20.3), a seat of the moving sealing ring (20.5), an O-shaped sealing ring (20.4), an automatic compensation spring (20.7), a fixed sealing ring (20.2) and a sealing ring (20.1). Between the exserted part of the main shaft and the shaft sealing gland in the utility model, a balanced mechanical seal structure is used. Cover sealing cover ensures low friction coefficient, and the sealing ring has the function of automatic compensation. The product has longer service life than that of traditional structures and accidents like leaking oil or gas cannot occur. A structure design of three exhaust ports is adopted and the placement of the three exhaust ports is convenient for arrangement of users.

Description

Roots vacuum pump with mechanical seal leakage-proof

Technical field

The utility model relates to a kind of vacuum pump, especially relates to a kind of roots vacuum pump with mechanical seal leakage-proof.

Background technique

Roots pump was invented by German engineer Roots in nineteen forty-four, and its effect is the purpose that the air in seal container or the closed system or other gas can be extracted and reaches certain vacuum.Only the application on traditional industry such as chemical industry, electric power, metallurgy was more universal for Roots pump in the past.Along with the fast development of modern industry, Roots pump also begins to be used in a large number on the new process of industries such as food, pharmacy, microelectronic, light industry.

Nearly all pharmaceutical factory, the health products raw material manufacturing enterprise in the whole world all using Roots pump or Roots Vacuum Pump Units at present.Because the Roots pump running speed is very high, must be equipped with a lubricating oil tank at the two ends of pump, make each transmission part of Roots pump that enough lubricated and coolings be arranged when running up.And the pumping chamber of Roots pump is not allow oil, otherwise can cause oil pollution to being taken out medium.And in fact in the pumping chamber of annual hundreds thousand of the Roots pumps of producing in the whole world oil is arranged all at present, well imagine that our employed medicine, health products, cosmetics etc. also can be subjected to the pollution of oil unavoidably, well imagine the harm of human body.Up to the present oilless roots vacuum pump does not also have this series products in the world in the real pumping chamber.

Existing Roots pump mainly is made up of component such as the pump housing, forward and backward end cap, impeller, dynamic seal, motors.The tradition old product mainly has the following disadvantages:

1, the motive sealing problem of main shaft external part.Traditional product all adopts the sealing configuration of outside framework oil seal, the poor reliability of this sealing, and needed only about three months working life, and pump oil external leakage is serious, gas leakage is serious.

2, single relief opening.Product has only a steam-expelling port, and the user installation position is limited to, and installs, uses inconvenient.

Summary of the invention

First purpose of the present utility model is to overcome above-mentioned deficiency, provides a kind of main shaft external part sealing reliability good roots vacuum pump with mechanical seal leakage-proof.

Second purpose of the present utility model is to overcome above-mentioned deficiency, and a kind of roots vacuum pump with mechanical seal leakage-proof that the no oil of a plurality of steam-expelling ports is arranged is provided.

First purpose of the present utility model is achieved in that a kind of roots vacuum pump with mechanical seal leakage-proof, comprise the pump housing, main shaft, rear end cover, bonnet, front cover, protecgulum and motor, described main shaft device is in the pump housing, rear end cover is fixed in pump housing rear end, bonnet is fixed in the rear end cover rear side, rear-end of spindle is stretched out rear end cover and is placed in the rear fuel tank, front cover places pump housing front end, protecgulum places the front cover front side, the protecgulum front end seals with the axle sealed cover, front-end of spindle stretches out front cover, protecgulum links to each other with motor output end with the axle sealed cover and by coupling, it is characterized in that:

Adopt mechanical seal between described main shaft external part and the axle sealed cover, this mechanical seal comprises motive sealing ring seat, rotary packing ring, O RunddichtringO, automatic counterbalance spring, stationary seal ring and seal ring, described motive sealing ring seat is fixedly connected on the main shaft external part with Cock screw, rotary packing ring is inserted in the step hole of seal ring seat front end, the O RunddichtringO is embedded in the step hole of rotary packing ring, automatically counterbalance spring axially is embedded in the spring eye on the rotary packing ring seat stand terrace, and O RunddichtringO and rotary packing ring are placed on the main shaft external part; Described seal ring is embedded in the step hole of sealed cover rear end, and stationary seal ring is embedded in the step hole of seal ring rear end, and stationary seal ring places the rotary packing ring side.

Second purpose of the present utility model is achieved in that the described pump housing is provided with three relief openings, and three relief openings are arranged at the and arranged on left and right sides and the bottom of the pump housing respectively.

The utlity model has following advantage:

1, adopt the balanced mechanical seal structure between main shaft external part and the axle sealed cover, face front cover friction factor is little, seal ring has automatic compensation function, and product is longer than conventional construction working life, leakage of oil, gas leak phenomenon can't occur.

2, adopt three exhaust outlet structure designs.Three steam-expelling ports are arranged, are convenient to user's layout.

Description of drawings

Fig. 1 is the vertical section structure schematic representation of the utility model roots vacuum pump with mechanical seal leakage-proof.

Fig. 2 is the A-A cut-away view of Fig. 1.

Fig. 3 is the I enlarged view of Fig. 1.

Fig. 4 is the External view of the utility model roots vacuum pump with mechanical seal leakage-proof.

Fig. 5 is the plan view of Fig. 4.

Fig. 6 is the side view of Fig. 4.

Among the figure: the pump housing 1, rear end cover 2, bonnet 3, mechanical seal I4, rear fuel tank 5, ball bearing 6, packing ring 7, gear ring 8, tooth shell 9, oily window 10, rotor 11, main shaft 12, driven shaft 13, air inlet cover plate 14, front cover 15, protecgulum 16, bearing gland 17, preceding fuel tank 18, axle sealed cover 19, mechanical seal II20, motor link press span 21, motor 22, coupling 23, exhaust cover plate 24, relief opening 25, suction port 26, oil filler 27, fuel outlet 28.

Seal ring 20.1, stationary seal ring 20.2, rotary packing ring 20.3, O RunddichtringO 20.4, motive sealing ring seat 20.5, Cock screw 20.6, automatic counterbalance spring 20.7.

Embodiment

Referring to Fig. 1～2, model utility is a kind of roots vacuum pump with mechanical seal leakage-proof, mainly is made up of the pump housing 1, main shaft 12, driven shaft 13, rotor 11, ball bearing 6, rear end cover 2, bonnet 3, front cover 15, protecgulum 16, axle sealed cover 17, motor link press span 21 and motor 22.Described main shaft 12 and driven shaft 13 are installed in the pump housing 1, rotor 11 is installed in main shaft 12 and the driven shaft 13, rear end cover 2 usefulness socket head screws are fixedly connected on the pump housing 1 rear end, what step hole rear end cover 2 centers are provided with, ball bearing 6 is embedded in the chopped-off head step hole of rear end cover 2, bonnet 3 usefulness socket head screws are fixedly connected on rear end cover 2 rear sides, the seal chamber that forms between bonnet 3 and the rear end cover 2 is a rear fuel tank 5, main shaft 12 rear ends are stretched out rear end cover 2 and are placed in the rear fuel tank 5, seal with employing mechanical seal I4 between main shaft 12 external parts and the rear end cover 2, main shaft 12 back external parts in the rear fuel tank 5 install packing ring 7 and tooth shell 9 successively, external part end, main shaft 12 back is fixed with round nut with rectangular seal and axle, uses hex screw and spring washer fixed gear ring 8 on the tooth shell 9.Front cover 15 places the pump housing 1 front end, protecgulum 16 places front cover 15 front sides, the seal chamber that forms between protecgulum 16 and the front cover 15 is preceding fuel tank 18, motor link press span 21 usefulness hex screws are fixedly connected on protecgulum 16 front sides, motor 22 usefulness double end hex head bolts are fixedly connected on motor link press span 21 front sides, front cover 15 front ends seal with packing ring 7 and bearing gland 19, protecgulum 16 front ends seal with axle sealed cover 19, main shaft 12 front ends stretch out front cover 15, protecgulum 16 also links to each other with motor 22 output terminals by coupling 23 with axle sealed cover 19, what step hole front cover 15 centers are provided with, ball bearing 6 is embedded in the chopped-off head step hole, adopt mechanical seal I4 sealing between main shaft 12 external parts and the front cover 15, adopt mechanical seal II20 sealing between main shaft 12 and the axle sealed cover 19, air inlet cover plate 14 usefulness O RunddichtringOs and hex screw are fixedly connected on the pump housing 1 top suction port, and exhaust cover plate 24 usefulness O RunddichtringOs and hex screw are fixedly connected on the pump housing 1 bottom and a left side, the relief opening of right side wall.

Referring to Fig. 3, the mechanical seal II20 between described main shaft external part and the axle sealed cover 19 mainly is made up of motive sealing ring seat 20.5, rotary packing ring 20.3, O RunddichtringO 20.4, automatic counterbalance spring 20.7, stationary seal ring 20.2 and seal ring 20.1.Described motive sealing ring seat 20.5 usefulness Cock screws 20.6 are fixedly connected on main shaft 12 external parts, rotary packing ring 20.3 is inserted in the step hole of seal ring seat 20.5 front ends, O RunddichtringO 20.4 is embedded in the step hole of rotary packing ring 20.3, automatically counterbalance spring 20.7 axially is embedded in the spring eye on motive sealing ring seat 20.5 step surfaces, and O RunddichtringO 20.4 and rotary packing ring 20.3 are placed on main shaft 12 external parts; Described seal ring 20.1 is embedded in the step hole of a sealed cover 19 rear ends, and stationary seal ring 20.2 is embedded in the step hole of seal ring 20.1 rear ends, and stationary seal ring 20.2 places rotary packing ring 20.3 sides.

Referring to Fig. 4,5,6, the pump housing 1 is provided with and arranged on left and right sides and the bottom that 25, three relief openings 25 of three relief openings are arranged at the pump housing 1 respectively, and suction port 26 is arranged on the top of the pump housing 1.

Claims

1. roots vacuum pump with mechanical seal leakage-proof, comprise the pump housing (1), main shaft (12), rear end cover (2), bonnet (3), front cover (15), protecgulum (16) and motor (22), described main shaft (12) is installed in the pump housing (1), rear end cover (2) is fixed in the pump housing (1) rear end, bonnet (3) is fixed in rear end cover (2) rear side, main shaft (12) rear end is stretched out rear end cover (2) and is placed in the rear fuel tank (5), front cover (15) places the pump housing (1) front end, protecgulum (16) places front cover (15) front side, protecgulum (16) front end seals with axle sealed cover (19), main shaft (12) front end stretches out front cover (15), protecgulum (16) also links to each other with motor (22) output terminal by coupling (23) with axle sealed cover (19), it is characterized in that:

Adopt mechanical seal II (20) sealing between described main shaft (12) external part and the axle sealed cover (19), this mechanical seal II (20) comprises motive sealing ring seat (20.5), rotary packing ring (20.3), O RunddichtringO (20.4), automatic counterbalance spring (20.7), stationary seal ring (20.2) and seal ring (20.1), described motive sealing ring seat (20.5) is fixedly connected on main shaft (12) external part with Cock screw (20.6), rotary packing ring (20.3) is inserted in the step hole of seal ring seat (20.5) front end, O RunddichtringO (20.4) is embedded in the step hole of rotary packing ring (20.3), automatically counterbalance spring (20.7) axially is embedded in the spring eye on motive sealing ring seat (20.5) step surface, and O RunddichtringO (20.4) and rotary packing ring (20.3) are placed on main shaft (12) external part; Described seal ring (20.1) is embedded in the step hole of a sealed cover (19) rear end, and stationary seal ring (20.2) is embedded in the step hole of seal ring (20.1) rear end, and stationary seal ring (20.2) places rotary packing ring (20.3) side.

2. a kind of roots vacuum pump with mechanical seal leakage-proof according to claim 1 is characterized in that: the described pump housing (1) is provided with three relief openings (25), and three relief openings (25) are arranged at the and arranged on left and right sides and the bottom of the pump housing (1) respectively.