CN218598807U - Air pressure closed type mechanical seal - Google Patents

Abstract

The utility model relates to the technical field of mechanical seal, in particular to a pneumatic closed mechanical seal, which comprises a transmission shaft and a protective sleeve, wherein the protective sleeve is arranged outside the transmission shaft, the protective sleeve is connected with the transmission shaft through a sealing component, the sealing component comprises movable grooves symmetrically arranged in the protective sleeve, fixed rods are transversely fixed on the inner walls of the movable grooves, push rods slide on the surfaces of the fixed rods, springs are wound on the surfaces of the fixed rods, connecting rods are arranged on the surfaces of the push rods, which are far away from the protective sleeve, and clamping plates are arranged on the surfaces of the connecting rods, which face the transmission shaft; through the seal assembly who sets up, can reduce the gap between transmission shaft and the protective sheath, can also increase the leakproofness of transmission shaft and protective sheath simultaneously, make the difficult exorbitant of liquid in transmission shaft and the protective sheath, improved the practicality of device greatly.

Description

Air pressure closed type mechanical seal

Technical Field

The utility model relates to a mechanical seal technical field especially relates to a pneumatic closed type mechanical seal.

Background

The mechanical seal is a shaft seal device of a rotary machine, which is a device for preventing fluid leakage, which is formed by keeping fit and relative sliding of at least one pair of end surfaces perpendicular to the axis of rotation under the action of fluid pressure and the elastic force (or magnetic force) of a compensation mechanism and the cooperation of an auxiliary seal.

The existing air pressure closed mechanical seal has a gap between a transmission shaft and a protective sleeve in the actual use process, dust easily enters the protective sleeve from the gap, the transmission shaft is easy to wear the surface of the transmission shaft in the process of using the transmission shaft in the protective sleeve, and the transmission shaft can rub the dust when rotating, so that large noise is generated, and therefore the air pressure closed mechanical seal is inconvenient for workers to use.

SUMMERY OF THE UTILITY MODEL

In order to overcome the not enough of prior art, the utility model provides a pneumatic closed type mechanical seal through the seal assembly who sets up, can reduce the gap between transmission shaft and the protective sheath, can also increase the leakproofness of transmission shaft and protective sheath simultaneously, makes the difficult exorbitant of liquid in transmission shaft and the protective sheath, has improved the practicality of device greatly.

In order to solve the technical problem, the utility model provides a following technical scheme: the utility model provides a pneumatic closed type mechanical seal, includes transmission shaft and protective sheath, the transmission shaft outside is provided with the protective sheath, the protective sheath passes through seal assembly and is connected with the transmission shaft, seal assembly includes that the symmetry sets up the activity groove in the protective sheath, all transversely be fixed with the dead lever on the activity inslot wall, the dead lever surface all slides there is the push rod, the dead lever surface all twines and is provided with the spring, one side that the push rod deviates from the protective sheath all is provided with the connecting rod on the surface, the connecting rod all is provided with the grip block towards one side of transmission shaft on the surface.

As a preferred technical scheme of the utility model, the push rod outside is provided with protective assembly, protective assembly includes that the symmetry sets up the fixed block on the protective sheath top surface, all rotate in the fixed block has the bull stick, the bull stick surface all is provided with the enclosing cover, one side that the enclosing cover deviates from the bull stick all is provided with the limiting plate on the surface, the spacing groove has all been seted up in the limiting plate, all rotate in the protective sheath at spacing groove middle part has the turning block, the turning block surface all twines and is provided with torsion spring, turning block top surface all is provided with the stopper.

As a preferred technical scheme of the utility model, the dead lever is cylindric design, seted up in the push rod with dead lever assorted cylinder groove.

As an optimal technical scheme of the utility model, the grip block has the rubber pad towards a side surface gluing of transmission shaft.

As the utility model discloses a preferred technical scheme, spring one end welding is on the push rod surface, the welding of the spring other end is on the activity inslot wall.

As a preferred technical scheme of the utility model, the stopper is pointer form design, the spacing groove is opened and is established to with stopper assorted through-hole, and the spacing groove is the dislocation design with the stopper.

As a preferred technical scheme of the utility model, bull stick both ends surface and the fixed block inner wall are laminated mutually.

Compared with the prior art, the utility model discloses the beneficial effect that can reach is:

1. the sealing assembly can reduce the gap between the transmission shaft and the protective sleeve and increase the sealing property of the transmission shaft and the protective sleeve, so that the liquid in the transmission shaft and the protective sleeve is not easy to leak, and the practicability of the device is greatly improved;

2. through the protection component who sets up, can protect the push rod, prevent that the transmission shaft when using, the staff mistake from touching the push rod, lead to the transmission shaft and the condition emergence that the liquid in the protective sheath leaked, can also shelter from the movable groove through the enclosing cover simultaneously, prevent that the foreign matter from falling into the movable groove.

Drawings

Fig. 1 is a schematic perspective view of the present invention;

fig. 2 is a schematic front view of the cross-sectional structure of the present invention;

fig. 3 is a side view, sectional and schematic structural view of the present invention;

fig. 4 is an enlarged schematic structural view of a point a in fig. 2 according to the present invention;

fig. 5 is an enlarged schematic structural view of the utility model at the position B in fig. 1;

fig. 6 is an enlarged schematic structural diagram of the present invention at the position C in fig. 3.

Wherein: 1. a drive shaft; 2. a protective sleeve; 3. a seal assembly; 31. a movable groove; 32. fixing the rod; 33. a push rod; 34. a spring; 35. a connecting rod; 36. a clamping plate; 4. a guard assembly; 41. a fixed block; 42. a rotating rod; 43. an outer cover; 44. a limiting plate; 45. a limiting groove; 46. rotating the block; 47. a torsion spring; 48. and a limiting block.

Detailed Description

In order to make the technical means, creation features, achievement objects and functions of the present invention easy to understand, the present invention will be further explained with reference to the following embodiments, however, the following embodiments are only preferred embodiments of the present invention, and not all embodiments are included. Based on the embodiments in the embodiment, other embodiments obtained by those skilled in the art without any creative work belong to the protection scope of the present invention. The experimental methods in the following examples are conventional methods unless otherwise specified, and materials, reagents and the like used in the following examples are commercially available unless otherwise specified.

Example (b):

referring to fig. 1-6, a pneumatic closed mechanical seal, includes a transmission shaft 1 and a protective sleeve 2, the protective sleeve 2 is disposed outside the transmission shaft 1, the protective sleeve 2 is connected with the transmission shaft 1 through a sealing assembly 3, the sealing assembly 3 includes movable grooves 31 symmetrically disposed in the protective sleeve 2, fixed rods 32 are transversely fixed on inner walls of the movable grooves 31, push rods 33 slide on surfaces of the fixed rods 32, springs 34 are wound on surfaces of the fixed rods 32, a connecting rod 35 is disposed on a surface of one side of the push rod 33 departing from the protective sleeve 2, and a clamping plate 36 is disposed on a surface of one side of the connecting rod 35 facing the transmission shaft 1.

When needs use transmission shaft 1, at first to the direction pulling push rod 33 that deviates from transmission shaft 1, make push rod 33 slide on dead lever 32, and extrude spring 34 to activity groove 31 inner wall department, then install into protective sheath 2 with transmission shaft 1 in, loosen push rod 33 this moment again, utilize spring 34 self elasticity to receive the restoring force that the extrusion produced to promote push rod 33 and slide that resets on dead lever 32, and make push rod 33 drive grip block 36 through connecting rod 35 and carry out the centre gripping to transmission shaft 1, can reduce the gap between transmission shaft 1 and the protective sheath 2 through this device, can also increase transmission shaft 1 and protective sheath 2's leakproofness simultaneously, make the difficult effluence of liquid in transmission shaft 1 and the protective sheath 2, the practicality of device has been improved greatly.

In other embodiments, the protection component 4 is disposed outside the push rod 33, the protection component 4 includes fixing blocks 41 symmetrically disposed on the top end surfaces of the protection sleeves 2, rotating rods 42 are all rotatably disposed in the fixing blocks 41, outer covers 43 are all disposed on the surfaces of the rotating rods 42, limiting plates 44 are all disposed on the surfaces of the outer covers 43 away from the rotating rods 42, limiting grooves 45 are all disposed in the limiting plates 44, rotating blocks 46 are all rotatably disposed in the protection sleeves 2 in the middle of the limiting grooves 45, torsion springs 47 are wound on the surfaces of the rotating blocks 46, and limiting blocks 48 are all disposed on the top end surfaces of the rotating blocks 46;

through the protection component 4 who sets up, when needs use transmission shaft 1, at first rotate stopper 48, make stopper 48 drive turning block 46 rotate in protective sheath 2, and make turning block 46 drive torsion spring 47 and produce deformation, rotate enclosing cover 43 again, make enclosing cover 43 drive bull stick 42 rotate in fixed block 41, and make enclosing cover 43 cover push rod 33, make enclosing cover 43 drive limiting plate 44 bottom and protective sheath 2 surface laminating again, spacing groove 45 passes stopper 48 simultaneously, then loosen stopper 48, the torsion that produces when receiving the rotation through torsion spring 47 self elasticity drives turning block 46 and resets and slide in protective sheath 2, and make stopper 48 and spacing groove 45 be the cross, it is spacing to make stopper 48 to enclosing cover 43, can protect push rod 33 through this device, prevent transmission shaft 1 when using, the staff mistake touches push rod 33, the condition that leads to the liquid in transmission shaft 1 and the protective sheath 2 to leak takes place, can also shelter from movable groove 31 through enclosing cover 43 simultaneously, prevent that the foreign matter from falling into movable groove 31.

In other embodiments, the fixing rod 32 is designed in a cylindrical shape, and a cylindrical groove matched with the fixing rod 32 is formed in the push rod 33;

through this design, can fully laminate with push rod 33 through dead lever 32 to guaranteed push rod 33 gliding stability on dead lever 32, prevented that spring 34 from promoting push rod 33 gliding in-process on dead lever 32, push rod 33 can appear blocking the condition emergence on dead lever 32.

In other embodiments, a rubber pad is glued to the surface of the clamping plate 36 facing the transmission shaft 1;

through this design, can make grip block 36 and transmission shaft 1 inner wall fully laminate through the compliance of rubber pad to the leakproofness of transmission shaft 1 has been increased.

In other embodiments, one end of the spring 34 is welded on the surface of the push rod 33, and the other end of the spring 34 is welded on the inner wall of the movable groove 31;

through this design, can carry on spacingly to spring 34, prevent that transmission shaft 1 from appearing rocking when using, spring 34 can be along with 1 rocking of transmission shaft striking activity groove 31 inner wall and push rod 33 surface, and cause the condition of great noise to take place.

In other embodiments, the limiting block 48 is designed in a pointer shape, the limiting groove 45 is provided with a through hole matched with the limiting block 48, and the limiting groove 45 and the limiting block 48 are designed in a staggered manner;

through this design, can reach the purpose of releasing to rotate spacing to enclosing cover 43 through turning to stopper 48 and lining up with spacing groove 45.

In other embodiments, the surfaces of the two ends of the rotating rod 42 are attached to the inner wall of the fixed block 41;

through the design, the rotating rod 42 can not rotate freely in the fixed block 41, so that the stability of the rotating rod 42 rotating in the fixed block 41 is ensured.

In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. "beneath," "under" and "beneath" a first feature includes the first feature being directly beneath and obliquely beneath the second feature, or simply indicating that the first feature is at a lesser elevation than the second feature.

The foregoing shows and describes the general principles, essential features, and advantages of the invention. It should be understood by those skilled in the art that the present invention is not limited by the above embodiments, and the description in the above embodiments and the description is only preferred examples of the present invention, and is not intended to limit the present invention, and that the present invention can have various changes and modifications without departing from the spirit and scope of the present invention, and these changes and modifications all fall into the scope of the claimed invention. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims (7)

1. The utility model provides a atmospheric pressure closed type mechanical seal, includes transmission shaft (1) and protective sheath (2), its characterized in that: transmission shaft (1) outside is provided with protective sheath (2), protective sheath (2) are connected with transmission shaft (1) through seal assembly (3), movable groove (31) in protective sheath (2) are seted up including the symmetry in seal assembly (3), all transversely be fixed with dead lever (32) on movable groove (31) inner wall, dead lever (32) surface all slides has push rod (33), dead lever (32) surface all twines and is provided with spring (34), one side that push rod (33) deviate from protective sheath (2) all is provided with connecting rod (35) on the surface, connecting rod (35) all is provided with grip block (36) on the surface of one side of transmission shaft (1).

2. A pneumatically closed mechanical seal according to claim 1, wherein: push rod (33) outside is provided with protecting component (4), protecting component (4) set up at protective sheath (2) top fixed block (41) on the surface including the symmetry, fixed block (41) are interior all to be rotated and have bull stick (42), bull stick (42) surface all is provided with enclosing cover (43), one side that enclosing cover (43) deviate from bull stick (42) all is provided with limiting plate (44) on the surface, spacing groove (45) have all been seted up in limiting plate (44), all rotate in protective sheath (2) at spacing groove (45) middle part and have turning block (46), turning block (46) surface all twines and is provided with torsion spring (47), turning block (46) top surface all is provided with stopper (48).

3. A pneumatically closed mechanical seal according to claim 1, wherein: the fixing rod (32) is in a cylindrical design, and a cylindrical groove matched with the fixing rod (32) is formed in the push rod (33).

4. A pneumatically closed mechanical seal according to claim 1, wherein: and a rubber pad is glued on the surface of one side, facing the transmission shaft (1), of the clamping plate (36).

5. A gas pressure closure type mechanical seal as claimed in claim 1, wherein: one end of the spring (34) is welded on the surface of the push rod (33), and the other end of the spring (34) is welded on the inner wall of the movable groove (31).

6. A pneumatically closed mechanical seal according to claim 2, wherein: stopper (48) are pointer form design, spacing groove (45) are opened and are established to the through-hole with stopper (48) assorted, and spacing groove (45) are the dislocation design with stopper (48).

7. A pneumatically closed mechanical seal according to claim 2, wherein: the surfaces of two ends of the rotating rod (42) are attached to the inner wall of the fixed block (41).

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