CN106949050B

CN106949050B - Roots pump

Info

Publication number: CN106949050B
Application number: CN201710365049.0A
Authority: CN
Inventors: 王于祥
Original assignee: Madebao Vacuum Equipment Group Co ltd
Current assignee: Madebao Vacuum Equipment Group Co ltd
Priority date: 2017-05-22
Filing date: 2017-05-22
Publication date: 2020-04-21
Anticipated expiration: 2037-05-22
Also published as: CN106949050A

Abstract

The invention provides a roots pump, and belongs to the technical field of vacuum obtaining equipment. The technical problem that the sealing performance between a shell and a lining of an existing roots pump is poor is solved. The Roots pump comprises a shell, wherein an inner sleeve made of an anti-corrosion material is arranged in the shell, a cooling water channel is arranged between the inner wall of the shell and the outer surface of the inner sleeve, a water inlet and a water outlet which are communicated with the cooling water channel are also formed in the shell, and a connecting layer is fixed at the joint of the shell and the inner sleeve to fix the inner sleeve on the inner wall of the shell. The cooling water channel has been seted up on the inner wall of this lobe pump's casing, and it is fixed to be connected through the connecting layer between casing and the endotheca, when can having good radiating effect to the endotheca, can also guarantee good leakproofness between casing and the endotheca.

Description

Roots pump

Technical Field

The invention belongs to the technical field of vacuum obtaining equipment, and relates to a roots pump.

Background

The Roots vacuum pump is a Roots pump for short, and is a variable-capacity vacuum pump in which two blade-shaped rotors which rotate synchronously in opposite directions are arranged in the pump, and small gaps are formed among the rotors and between the rotors and the inner wall of a pump shell so as not to be in contact with each other. When the roots pump conveys corrosive media, the corrosive media can corrode the pump body and the rotor, and the service life is shortened.

To solve the above technical problem, chinese patent document No. 201320229004.8 discloses: a Roots pump with an anti-corrosion layer comprises a screw, a left shell, a right shell and left and right linings made of polyhexamethylene adipamide; the left lining is attached to the inner side face of the left shell, the right lining is attached to the inner side face of the right shell, the left lining is connected with the right lining, and the left shell is connected with the right shell through screws and tightly presses the left lining and the right lining.

The roots pump has an anti-corrosion function, however, the lining is attached to the housing through injection molding, no cooling water channel is formed between the housing and the lining, so that after the roots pump works for a long time, heat is difficult to dissipate from the lining, and if the cooling water channel is arranged between the housing and the lining, for example, the cooling water channel is arranged on the inner wall of the housing, the lining cannot be attached to the housing through injection molding, and molten plastic can be filled into the cooling water channel during injection molding.

Disclosure of Invention

The invention provides a roots pump aiming at the problems in the prior art, and the technical problems to be solved by the invention are as follows: how to ensure good sealing performance between the shell and the inner sleeve.

The purpose of the invention can be realized by the following technical scheme:

a Roots pump comprises a shell, wherein an inner sleeve made of an anti-corrosion material is arranged in the shell, and the Roots pump is characterized in that a cooling water channel is arranged between the inner wall of the shell and the outer surface of the inner sleeve, the shell is also provided with a water inlet and a water outlet which are communicated with the cooling water channel, and a connecting layer is fixed at the joint of the shell and the inner sleeve to fix the inner sleeve on the inner wall of the shell.

The casing (being the pump body) internal fixation of this lobe pump has the endotheca, and the endotheca is made by corrosion resistant material, plays fine anti-corrosion to the pump body, forms the cooling water course between the inner wall of casing and the surface of endotheca, and at lobe pump during operation, add water toward the cooling water course through the water inlet, and the water rethread delivery port of circulation flows, and at the endless in-process, the water in the cooling water course all direct contact with casing and endotheca, and water plays good radiating effect to the pump body. A cooling water channel is required to be arranged between the inner wall of the shell and the outer surface of the inner sleeve, so that the inner sleeve cannot be directly molded on the inner wall of the shell in an injection molding mode.

The shell of the Roots pump can be firstly provided with a cooling water channel on the inner wall of the shell, then the inner sleeve is separately manufactured and molded, then the inner sleeve is fixed in the shell, as the inner sleeve and the shell are of a split structure, a gap is formed at the joint of the shell and the inner sleeve, a sealant is coated at the gap, a connecting layer is formed after the sealant is solidified, the connecting layer is simultaneously adhered with the inner sleeve and the shell, so that the inner sleeve is fixed on the inner wall of the shell, and the connecting layer simultaneously fills the gap between the inner sleeve and the shell, so that good sealing is formed between the shell and the inner sleeve.

In the roots pump, the inner sleeve includes a cylindrical sleeve body, the inner sleeve is of an integrated structure, the housing includes an upper housing and a lower housing, the upper housing and the lower housing are detachably fixed, the upper housing and the lower housing respectively abut against the upper half part and the lower half part of the sleeve body, and the connecting layer is fixed at the joint between the housing and the front end part and the rear end part of the sleeve body. The casing of split type structure can be with the more convenient installation of endotheca in the casing, the endotheca of integral type structure can and the casing between form better sealed, and make the water in the cooling water course can not flow into the endotheca the inside, the articulamentum is all fixed on the casing with the preceding tip and the back tip of the cover body, and makes the preceding tip and the back tip of the cover body and form sealedly with the casing, further increases leakproofness and the firmness of being connected between casing and the endotheca. Of course, the housing may be a combined structure of a left housing and a right housing, which is a conventional technical means for those skilled in the art.

In the roots pump, the front end portion and the rear end portion of the housing are both provided with annular grooves, the front end portion and the rear end portion of the sleeve body respectively penetrate out of the two ends of the housing, the annular grooves respectively surround the front end portion and the rear end portion of the sleeve body, and the connecting layer is fixed in each annular groove. The annular groove can contain more sealing agents, after the sealing agents are solidified, the connecting layer is in contact with the inner side wall of the shell and is fixed, and the connecting layer is in contact with the outer side face of the sleeve body and is fixed, so that the sealing performance and firmness of connection between the shell and the inner sleeve can be further improved.

In the roots pump, the left half part and the right half part of the sleeve body are both partial circular rings, the joint of the two parts is provided with a groove which is recessed inwards, the shape of the annular groove is consistent with that of the sleeve body, the shape of the connecting layer in each annular groove is consistent with that of the corresponding annular groove, and the connecting layer is provided with a convex part which extends into the groove. The sealing agent is filled in the annular groove, the connecting layers are formed after solidification, the protruding parts of the connecting layers extend into the grooves, the connecting layers and the end parts of the corresponding sleeve bodies form clamping structures, and the sealing performance and firmness of connection between the shell and the inner sleeve can be further improved.

In the roots pump, the lower portion and the upper portion of the housing are respectively provided with the air inlet and the air outlet, the peripheries of the air inlet and the air outlet are respectively provided with a first convex edge extending outwards, the upper portion and the lower portion of the inner sleeve are respectively provided with a second convex edge extending outwards, the first convex edge and the second convex edge are both annular, the outer side surface of each second convex edge is attached to and fixed to the inner wall of one first convex edge, and a connecting layer is fixed at the joint of each second convex edge and the end of the corresponding first convex edge. The structure that all is annular protruding along one and protruding along two phase and pastes can increase the area of contact between casing and the endotheca, and the articulamentum is fixed and is sealed protruding along two and protruding tip along one, further increases the leakproofness between casing and the endotheca and the firmness of being connected.

In the roots pump, the outer end face of the first convex edge is provided with notches, each notch is respectively communicated with the inner wall of the corresponding first convex edge, and the connecting layer is fixed in the corresponding notch and fixed with the outer wall of the second convex edge. The gap on the outer terminal surface of protruding edge one can hold more sealants, and when the sealant solidifies the back, the articulamentum both contacted and fixed mutually with protruding edge one and gone up the lateral wall of breach, contacted and fixed mutually with protruding lateral surface along two again, and the leakproofness and the firmness of being connected between casing and the inside lining can further be increased to this structure.

In the roots pump, the notches are annular, and the connecting layer fixed in the corresponding notch is also annular. The contact area between the annular connecting layer and the first convex edge and the second convex edge is larger, and the structure can further increase the sealing property and firmness of the connection between the shell and the lining.

In the roots pump, the circumferential edges of the air inlet and the air outlet are respectively provided with a third convex edge extending inwards, the third convex edges are both annular, and the third convex edges are respectively attached to and fixed with the outer side surface of the inner sleeve. The three annular convex edges can further increase the contact area between the shell and the inner sleeve, thereby increasing the sealing property and firmness of connection between the shell and the inner sleeve.

In the roots pump, the cooling water channel is formed in the inner wall of the housing, the bottom wall of the cooling water channel is arc-shaped, and two ends of the cooling water channel extend to the corresponding convex edges respectively. The diapire of water course is the arc, and the water course extends to the lower part of casing from the upper portion of casing, and the cooling water course volume of this structure is bigger, can make the water in the cooling water course and the more abundant contact of lateral surface of endotheca, improves the radiating effect.

As another scheme, a cooling water channel can be arranged on the outer surface of the inner sleeve.

In the roots pump, the edge of the upper casing has an upper convex edge extending outward, the edge of the lower casing has a lower convex edge extending outward, the upper convex edge and the lower convex edge are attached to each other and fixed by bolts, and the upper casing and the lower casing are tightly fitted with the inner sleeve. Go up casing and inferior valve body group and constitute split type structure, earlier sheathe including last casing and lower casing cover in the installation, paste the back with protruding along with protruding down along mutually, will go up casing and casing down through the bolt and fix, this structure simple to operate (dismantle also convenient), firm in connection. After the upper shell and the lower shell are fixed together, the inner sleeve is clamped by the upper shell and the lower shell, a good fixing effect is achieved, and the sealing performance and firmness of connection between the upper shell and the lower shell and the inner sleeve can be further improved by the structure.

Compared with the prior art, the invention has the following advantages:

1. the cooling water channel has been seted up on the inner wall of this lobe pump's casing, and it is fixed to be connected through the connecting layer between casing and the endotheca, when can having good radiating effect to the endotheca, can also guarantee good leakproofness between casing and the endotheca.

2. In this lobe pump's the casing, breach on the casing all is the annular, fixes and also is the annular at the inlayer that corresponds in the breach (solidify the back sealant promptly), fixes mutually through being annular inlayer between casing and the endotheca, can further increase leakproofness and the firmness of being connected between casing and the endotheca.

Drawings

Fig. 1 is a schematic view of the construction of a roots pump.

Fig. 2 is a sectional view of the roots pump.

Fig. 3 is a schematic structural view of the notch.

Fig. 4 is a schematic view of the structure of the annular groove.

Fig. 5 is a schematic structural view of the glove body.

In the figure, 1a housing; 1a is convex along one; 1b convex edge three; 1c, an upper shell; 1c1 upper convex edge; 1d lower shell; 1d1 lower ledge; 2, inner sleeve; 2a convex edge II; 2b, a sleeve body; 2b1 groove; 3, cooling water channels; 4, a water inlet; 5, water outlet; 6 connecting layers; 6a projection; 7 an air inlet; 8, an air outlet; 9, a notch; 10, bolts; 11 annular grooves.

Detailed Description

The following are specific embodiments of the present invention and are further described with reference to the drawings, but the present invention is not limited to these embodiments.

As shown in fig. 1-2, the roots pump comprises a housing 1, an inner sleeve 2 made of an anti-corrosion material is arranged in the housing 1, a cooling water channel 3 is arranged between the inner wall of the housing 1 and the outer surface of the inner sleeve 2, the housing 1 is further provided with a water inlet 4 and a water outlet 5 which are both communicated with the cooling water channel 3, and a connecting layer 6 is fixed at the joint of the housing 1 and the inner sleeve 2 so that the inner sleeve 2 is fixed on the inner wall of the housing 1.

As shown in fig. 2 or 5, in this embodiment, the inner sleeve 2 includes a cylindrical sleeve body 2b, the inner sleeve 2 is of an integrated structure, the shell 1 includes an upper shell 1c and a lower shell 1d, the upper shell 1c and the lower shell 1d are detachably fixed, the upper shell 1c and the lower shell 1d respectively abut against the upper half part and the lower half part of the sleeve body 2b, and the joints between the front end part and the rear end part of the sleeve body 2b and the shell 1 are fixed with the connecting layer 6. Casing 1 of split type structure can be with 2 more convenient installations of endotheca in casing 1, the endotheca of integral type structure 2 can and casing 1 between form better sealed, and make the water in the cooling water course 3 can not flow into 2 insides of endotheca, artical 6 all fixes the preceding tip and the back tip of the cover body 2b on casing 1, and make the preceding tip and the back tip of the cover body 2b form sealedly with casing 1, further increase the leakproofness and the firmness of being connected between casing 1 and endotheca 2. Of course, the housing 1 may be a combined structure of the left housing 1 and the right housing 1, which is a conventional technique for those skilled in the art.

As shown in fig. 2 or 4, the front end and the rear end of the housing 1 are both provided with annular grooves 11, the front end and the rear end of the sleeve body 2b respectively penetrate through the two ends of the housing 1, each annular groove 11 respectively surrounds the front end and the rear end of the sleeve body 2b, and the connecting layer 6 is fixed in each annular groove 11. The annular groove 11 can contain more sealing agent, and after the sealing agent is solidified, the connecting layer 6 is in contact with the inner side wall of the shell 1 and is fixed with the inner side wall of the shell 2b, and is in contact with the outer side surface of the sleeve body 2b and is fixed with the outer side wall of the shell 2b, so that the sealing performance and firmness of connection between the shell 1 and the inner sleeve 2 can be further improved.

As shown in fig. 4 or 5, the left half and the right half of the sheath body 2b are both partial circular rings, and the joint of the two is provided with a concave groove 2b1 which is concave inwards, the shape of the annular groove 11 is consistent with that of the sheath body 2b, the connecting layer 6 in each annular groove 11 is consistent with that of the corresponding annular groove 11, and each connecting layer 6 is provided with a convex part 6a which extends into the concave groove 2b 1. The sealing agent is filled in the annular groove 11, the connecting layers 6 are formed after solidification, the convex parts 6a of the connecting layers 6 extend into the grooves 2b1, and the connecting layers 6 and the end parts of the corresponding sleeve bodies 2b form clamping structures, so that the sealing performance and firmness of connection between the shell 1 and the inner sleeve 2 can be further improved.

As shown in fig. 2, the lower portion and the upper portion of the casing 1 are respectively provided with an air inlet 7 and an air outlet 8, the peripheries of the air inlet 7 and the air outlet 8 are respectively provided with a first convex edge 1a extending outwards, the upper portion and the lower portion of the inner sleeve 2 are respectively provided with a second convex edge 2a extending outwards, the first convex edge 1a and the second convex edge 2a are both annular, the outer side surface of each second convex edge 2a is attached to and fixed with the inner wall of one first convex edge 1a, and the connecting layer 6 is fixed at the connecting position of each second convex edge 2a and the end of the corresponding first convex edge 1 a. The structure that all is annular protruding along one 1a and protruding along two 2a and paste mutually can increase the area of contact between casing 1 and the endotheca 2, and articulamentum 6 is fixed and sealed protruding along two 2a and protruding along the tip of one 1a, further increases the leakproofness between casing 1 and the endotheca 2 and the firmness of being connected.

As shown in fig. 3 or 4, in the present embodiment, notches 9 are formed on the outer end surface of the first ledge 1a, each notch 9 penetrates through the inner wall of the corresponding first ledge 1a, and the connection layer 6 is fixed in the corresponding notch 9 and fixed to the outer wall of the second ledge 2 a. The gap 9 on the outer end face of the convex edge I1 a can contain more sealant, and after the sealant is solidified, the connecting layer 6 is in contact with the side wall of the gap 9 on the convex edge I1 a and is fixed with the side wall of the convex edge II 2a, and is in contact with the outer side face of the convex edge II 2a and is fixed with the outer side face of the convex edge II 2a, so that the sealing performance and firmness of connection between the shell 1 and the inner sleeve 2 can be further improved.

As shown in fig. 4, the notches 9 are preferably annular, and the connecting layer 6 fixed in the corresponding notch 9 is also annular. The contact area between the annular connecting layer 6 and the convex edges 1a and 2a is larger, and the structure can further increase the sealing property and firmness of the connection between the shell 1 and the lining.

As shown in fig. 2, the circumferential edges of the air inlet 7 and the air outlet 8 are provided with convex edges three 1b extending inwards, the convex edges three 1b are annular, and the convex edges three 1b are attached to and fixed with the outer side surface of the inner sleeve 2. The convex edges 1b which are all annular can further increase the contact area between the shell 1 and the lining, thereby increasing the sealing property and firmness of connection between the shell and the lining.

As shown in fig. 2, the cooling water channel 3 is provided on the inner wall of the housing 1, the bottom wall of the cooling water channel 3 is arc-shaped, and two ends of the cooling water channel 3 extend to the corresponding convex edges three 1b respectively. The diapire of water course is the arc, and the water course extends to the lower part of casing 1 from the upper portion of casing 1, and the cooling water course 3 volume of this structure is bigger, can make the water in the cooling water course 3 and the more abundant contact of the lateral surface of endotheca 2, improves the radiating effect.

Alternatively, the outer surface of the inner sleeve 2 may be provided with a cooling water channel 3.

In the embodiment, as shown in fig. 2, the edge of the upper casing 1c has an outwardly extending upper ledge 1c1, the edge of the lower casing 1d has an outwardly extending lower ledge 1d1, the upper ledge 1c1 abuts against the lower ledge 1d1 and is fixed by the bolt 10, and the upper casing 1c and the lower casing 1d are tightly fitted with the inner sleeve 2. Go up casing 1c and casing 1d and constitute split type structure down, earlier go up casing 1c and casing 1d cover on endotheca 2 down in the installation, paste the back along 1c1 and lower flange 1d1 mutually at last protruding, fix last casing 1c and casing 1d down through bolt 10, this structure simple to operate (dismantle also convenient), firm in connection. After the upper shell 1c and the lower shell 1d are fixed together, the inner sleeve 2 is clamped by the upper shell 1c and the lower shell 1d, so that a good fixing effect is achieved, and the structure can further improve the sealing performance and firmness of connection between the upper shell 1c and the inner sleeve 2 and between the lower shell 1d and the inner sleeve 2.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.

Claims

1. A Roots pump comprises a shell (1), wherein an inner sleeve (2) made of an anti-corrosion material is arranged in the shell (1), and the Roots pump is characterized in that a cooling water channel (3) is arranged between the inner wall of the shell (1) and the outer surface of the inner sleeve (2), the shell (1) is further provided with a water inlet (4) and a water outlet (5) which are communicated with the cooling water channel (3), a connecting layer (6) is fixed at the joint of the shell (1) and the inner sleeve (2) to fix the inner sleeve (2) on the inner wall of the shell (1), and the connecting layer (6) is formed by solidifying a sealant; the inner sleeve (2) comprises a cylindrical sleeve body (2b), annular grooves (11) are formed in the front end portion and the rear end portion of the shell (1), the front end portion and the rear end portion of the sleeve body (2b) penetrate out of the two ends of the shell (1) respectively, each annular groove (11) surrounds the front end portion and the rear end portion of the sleeve body (2b) respectively, and the connecting layer (6) is fixed in each annular groove (11).

2. A roots pump according to claim 1, wherein the inner housing (2) is a one-piece structure, the housing (1) comprises an upper housing (1c) and a lower housing (1d), the upper housing (1c) and the lower housing (1d) are detachably fixed, and the upper housing (1c) and the lower housing (1d) respectively abut against the upper half part and the lower half part of the housing body (2 b).

3. A roots pump according to claim 1, wherein the left and right halves of the sheath body (2b) are part circular rings and the junction of the two has an inwardly recessed groove (2b1), the shape of the annular groove (11) corresponds to the shape of the sheath body (2b), the tie layer (6) in each annular groove (11) corresponds to the shape of the corresponding annular groove (11) and each tie layer (6) has a protrusion (6a) extending into the groove (2b 1).

4. A roots pump according to claim 1 or 2 or 3, wherein the lower part and the upper part of the shell (1) are respectively provided with the air inlet (7) and the air outlet (8), the peripheral edges of the air inlet (7) and the air outlet (8) are respectively provided with a first outwardly extending convex edge (1a), the lower part and the upper part of the inner sleeve (2) are respectively provided with a second outwardly extending convex edge (2a), the first convex edge (1a) and the second convex edge (2a) are respectively annular, the outer side surface of each second convex edge (2a) is abutted against and fixed with the inner wall of one first convex edge (1a), and the connection part of each second convex edge (2a) and the end part of the corresponding first convex edge (1a) is respectively fixed with the connecting layer (6).

5. A Roots pump according to claim 4, wherein the outer end faces of the first flanges (1a) are provided with notches (9), each notch (9) extends through the inner wall of the corresponding first flange (1a), and the connecting layer (6) is fixed in the corresponding notch (9) and fixed with the outer wall of the second flange (2 a).

6. A Roots pump according to claim 5, in which the indentations (9) are each annular, as are the connecting layers (6) secured in the respective indentations (9).

7. A Roots pump according to claim 4, wherein the inlet (7) and outlet (8) have inwardly extending flanges (1b) on their peripheral edges, the flanges (1b) are annular, and the flanges (1b) are attached to and fixed to the outer surface of the inner casing (2).

8. A Roots pump according to claim 7, wherein the cooling water channel (3) opens on the inner wall of the housing (1), the bottom wall of the cooling water channel (3) is arc-shaped, and both ends of the cooling water channel (3) extend to the corresponding convex edges (1b), respectively.

9. A roots pump according to claim 2, wherein the rim of the upper casing (1c) has an outwardly extending upper ledge (1c1), the rim of the lower casing (1d) has an outwardly extending lower ledge (1d1), the upper ledge (1c1) abuts against the lower ledge (1d1) and the upper ledge and the lower ledge are fixed by the bolt (10), and the upper casing (1c) and the lower casing (1d) are tightly fitted with the inner casing (2).