CN212616302U - Double-end-face mechanical seal for push-type double-screw pump - Google Patents

Abstract

The utility model discloses a double-end-face mechanical seal for a push-type double-screw pump, which comprises a first movable ring, a first static ring, a static ring seat, a second static ring and a second movable ring which are sequentially sleeved on a rotating shaft, wherein one end of the static ring seat is provided with a first mounting groove, the first static ring is assembled in the first mounting groove, and a sealing surface of the first static ring and a sealing surface of the first movable ring are laminated to form a main sealing grinding surface; the other end of the static ring seat is provided with a second mounting groove, a second static ring is matched in the second mounting groove, and a sealing surface of the second static ring is attached to a sealing surface of the second movable ring to form an auxiliary sealing grinding surface; elastic compensation components are arranged between the first static ring tail end and the first mounting groove and between the second static ring tail end and the second mounting groove. The utility model provides a pair of two end face mechanical seal for impulse type twin-screw pump, simple structure, the installation distance is short, and occupation space is little, and the totality part is few, and reduce cost is convenient for install and maintain.

Description

Double-end-face mechanical seal for push-type double-screw pump

Technical Field

The utility model relates to a mechanical seal technical field specifically is a two-end mechanical seal for impulse type double screw pump.

Background

With the development of screw pump equipment, a special propelling type screw pump appears in the market, combines the advantages of all traditional screw pumps, is very suitable for working conditions of most viscous media, and is suitable for working conditions of low-viscosity media due to the fact that the pump generates small pulsation and the rotating speed can reach 3600 r/min. The special screw pump has wide application range, including food, sanitary field and industrial field, and has complex use working condition, so the special screw pump has high requirement on mechanical seal, and the mechanical seal must simultaneously meet the requirements of the working conditions of different fields such as food sanitary field, industrial field and the like. The mechanical seal for the traditional double-screw pump is difficult to be applied to the wide field and the variable and complicated working conditions.

The mechanical seal commonly used for the screw pump comprises a single-end-face mechanical seal and a double-end-face mechanical seal. The double-end-face mechanical seal is usually a series mechanical seal or a back-to-back mechanical seal composed of two sets of general mechanical seals. The screw pump has the defects of complex structure, large installation difficulty, occupied space, easy dead angle of a sealing structure and difficulty in meeting the requirement of sanitation level, and the defects that the universal sealing does not adjust the sealing parameters according to the working condition characteristics and the use requirement of the special screw pump.

Due to the defects, the existing sealing structure is often unstable in sealing performance and difficult to meet the conditions of different industrial standards when the special screw pump is used.

SUMMERY OF THE UTILITY MODEL

The utility model discloses the technical problem that will solve is: the double-end-face mechanical seal for the push type double-screw pump is simple in structure, short in installation distance, small in occupied space, few in total parts, low in cost and convenient to install and maintain.

The utility model adopts the technical proposal that: the double-end-face mechanical seal for the push-type double-screw pump comprises a first movable ring, a first static ring, a static ring seat, a second static ring and a second movable ring which are sequentially sleeved on a rotating shaft, wherein one end of the static ring seat is provided with a first installation groove, the first static ring seal is assembled in the first installation groove in a sliding mode, and a sealing surface of the first static ring is attached to a sealing surface of the first movable ring to form a main seal grinding surface; the other end of the static ring seat is provided with a second mounting groove, the second static ring is hermetically and slidably matched in the second mounting groove, and a sealing surface of the second static ring is attached to a sealing surface of the second movable ring to form an auxiliary sealing grinding surface; elastic compensation components are arranged between the first static ring tail end and the first mounting groove and between the second static ring tail end and the second mounting groove.

Compared with the prior art, the utility model has the following advantage:

in the mechanical sealing structure of the utility model, double mechanical seals are adopted, and two sets of seals share one static ring seat, thus effectively saving the sealing installation space; the design can reduce the number of different sealing parts and reduce the inventory pressure of equipment accessories; the utilization rate of product parts is improved, the complexity of the sealing structure is reduced, the sealing structure is simpler, the sealing use cost is reduced while the sealing performance is ensured, and the product competitiveness is improved; in addition, corresponding elastic compensation assemblies are arranged at the tail parts of the first static ring and the second static ring in the structure, and the sealing performance of the sealing grinding surface is effectively guaranteed.

Furthermore, first rotating ring include rotating ring main part and rotating ring seat, the rotating ring seat on be equipped with the cooperation groove, the sealed cooperation of the one end that first quiet ring was kept away from to the rotating ring main part is in the cooperation groove.

And the improved structure is characterized in that a sealing ring is arranged between the radial outer side wall of the moving ring main body and the inner side wall of the assembling groove, and a tetrafluoro gasket is arranged between the assembling groove and the tail end of the moving ring main body. The structure effectively avoids rigid contact between the movable ring main body and the movable ring metal seat, and avoids deformation of the sealing surface when the movable ring main body is in rigid contact and in sealing operation.

Preferably, one end of the rotating shaft, which is close to the second rotating ring, is provided with a limiting step and a second transmission pin, the second rotating ring is provided with a corresponding second transmission pin groove, and after the second rotating ring is axially arranged in the limiting step, the second transmission pin is matched in the second transmission pin groove.

And the fixed ring seat is provided with a positioning groove on one side close to the outer end face of the pump cavity, the outer end face of the pump cavity is provided with an anti-rotation stop block, and the anti-rotation stop block is provided with a positioning block matched with the positioning groove. In the structure, as long as a positioning groove is milled on the static ring seat at the atmosphere side and is matched with the protruding end of the anti-rotation stop block on the outer end face of the pump cavity, the anti-rotation effect of the static ring seat is achieved, the structure is very simple, the transmission performance is reliable, and meanwhile, the static ring seat is convenient to mount and dismount.

As the improvement, be equipped with feed liquor hole and play liquid hole on the quiet ring seat lateral wall, be equipped with the runner of two intercommunications first mounting groove and second mounting groove on the quiet ring seat inside wall along the axial, and two the runner respectively with feed liquor hole, play liquid hole intercommunication. In this structure, at the inside runner design that washes of quiet ring seat to the runner communicates with first mounting groove, second mounting groove respectively, and the runner realizes the intercommunication with main seal, vice sealed position promptly, thereby makes the more timely abundant lubrication of flush fluid/buffer fluid to main and vice sealed face, reduces the frictional heat of sealed face, avoids sealed face at the operation in-process, the terminal surface heat altered shape that a large amount of friction people lead to.

Preferably, the elastic compensation assembly comprises a plurality of small springs, a plurality of spring holes are formed in the bottoms of the first mounting groove and the second mounting groove along the circumferential direction, one ends of the small springs are matched in the corresponding spring holes, and the other ends of the small springs respectively abut against the tail ends of the first static ring and the second static ring. A plurality of small springs are used as elastic compensation pieces, so that the structure is simple, the elastic compensation force is stable, and the maintenance is convenient.

Drawings

Fig. 1 is the double-end-face mechanical seal half-section structure schematic diagram for the push-type double-screw pump.

Fig. 2 is a schematic structural view of the middle stationary ring seat of the present invention.

Fig. 3 is another angle structure diagram of the middle stationary ring seat of the present invention.

Fig. 4 is another angle structure diagram of the middle stationary ring seat of the present invention.

Fig. 5 is a schematic structural diagram of the double-end-face mechanical seal assembly for the push-type twin-screw pump of the present invention in the pump cavity.

Fig. 6 is a structural diagram of the anti-rotation stopper of the present invention.

Fig. 7 is a mounting structure view of the middle anti-rotation block and the stationary ring seat of the present invention.

Wherein, 101-liquid inlet hole, 102-liquid outlet hole;

1-first movable ring, 1.1-movable ring main body, 1.2-movable ring seat, 1.2.1-assembly groove, 1.3-first transmission pin, 2-first stationary ring, 3-stationary ring seat, 3.1-first installation groove, 3.2-second installation groove, 3.3-positioning groove, 3.4-flushing runner, 3.5-annular clamping groove, 4-second stationary ring, 5-second movable ring, 5.1-second transmission pin groove, 6-small spring, 7-spring hole, 8-anti-rotation pin, 9-second transmission pin, 10-anti-rotation block, 10.1-positioning block and 10.2-arc-shaped clamping ring.

Detailed Description

The present invention will be further described with reference to the accompanying drawings and the following detailed description.

In the description of the present invention, it should be noted that the terms "outer side wall", "inner side wall", "bottom", "tail end", "outer end face", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. In addition, in the description of the present invention, the terms "first" and "second" are used for convenience of description and distinction, and have no specific meaning.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted", "connected" and "fitted" are to be understood broadly, and may be, for example, 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 meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

As shown in fig. 1, the double-end mechanical seal for a push-type double-screw pump provided by the present invention comprises a first rotating ring 1, a first stationary ring 2, a stationary ring seat 3, a second stationary ring 4 and a second rotating ring 5, which are sequentially sleeved on a pump shaft; wherein, one end of the stationary ring seat 3 is provided with a first mounting groove 3.1, and the first stationary ring 2 is hermetically and slidably assembled in the first mounting groove 3.1; specifically, a corresponding sealing ring is arranged between the radial outer end face of the first stationary ring 2 and the inner side wall of the first mounting groove 3.1, meanwhile, for stable limiting of the sealing ring, a corresponding sealing ring groove is formed in the inner side wall of the first mounting groove 3.1, the outer ring of the sealing ring is accommodated in the sealing ring groove, and the inner ring of the sealing ring is sleeved on the outer side wall of the first stationary ring 2 to realize sealing connection at a matching position; the sealing surface of the first static ring 2 is attached to the sealing surface of the first movable ring 1 to form a main sealing grinding surface.

On the other hand, a second mounting groove 3.2 is formed in the other end of the stationary ring seat 3, and the second stationary ring 4 is hermetically and slidably matched in the second mounting groove 3.2; similarly, a corresponding sealing ring is arranged between the radial outer end face of the second stationary ring 4 and the inner side wall of the second mounting groove 3.2, meanwhile, for stable limiting of the sealing ring, a corresponding sealing ring groove is formed in the inner side wall of the second mounting groove 3.2, the outer ring of the sealing ring is accommodated in the sealing ring groove, and the inner ring of the sealing ring is sleeved on the outer side wall of the second stationary ring 4 to realize sealing connection at a matching part; and the sealing surface of the second static ring 4 is jointed with the sealing surface of the second movable ring 5 to form a secondary sealing grinding surface.

In this structure, in order to realize that main seal grinds the face, vice seal grinds the face after taking place the terminal surface wearing and tearing, can continue to guarantee sealing performance, all be equipped with the elasticity compensation subassembly between 2 tail ends of first quiet ring and first mounting groove 3.1 and between 4 tail ends of second quiet ring and second mounting groove 3.2. Due to the fact that the corresponding elastic compensation elements are arranged, after certain abrasion occurs to the corresponding sealing grinding surface, the elastic compensation elements always have axial acting force at the tail ends of the first static ring 2 and the second static ring 4, and therefore the movable ring and the static ring can be attached tightly all the time, and sealing performance is guaranteed.

In this embodiment, specific elastic compensation subassembly includes a plurality of little springs 6, and the bottom of first mounting groove 3.1, second mounting groove 3.2 all is equipped with a plurality of spring holes 7 along circumference, and the cooperation of a plurality of little springs 6 one end is in corresponding spring hole 7, and the other end corresponds respectively and leans on the tail end at first quiet ring 2, second quiet ring 4. Of course, in order to increase the stability of each small spring and prevent the small spring from inclining laterally in the compression process, a spring guide pin can be sleeved in the small spring 6, one end of the guide pin is inserted in the spring hole 6, and the other end of the guide pin abuts against the tail end face of the corresponding stationary ring.

Specifically, in the sealing structure, the first movable ring 1 comprises a movable ring main body 1.1 and a movable ring seat 1.2, a fitting groove 1.2.1 is formed in the movable ring seat 1.2, and one end, far away from the first stationary ring 2, of the movable ring main body 1.1 is in sealing fit with the fitting groove 1.2.1. Specifically, be equipped with the sealing washer between the radial lateral wall of rotating ring main part 1.1 and the inside wall of joining in marriage dress groove 1.2.1 to, join in marriage and still be equipped with tetrafluoro gasket 1.4 between the tail end of dress groove 1.2.1 bottom and rotating ring main part 1.1, connected mode has avoided rotating ring main part 1.1 and rotating ring seat 1.2's rigid contact like this, has avoided the rotating ring main part under rigid contact, when sealed operation, sealed face takes place to warp.

As shown in fig. 1, in the structure, the seal ring between the moving ring main body 1.1 and the moving ring seat 1.2 and the seal ring between the first stationary ring 2 and the first mounting groove 3.1 are located on the same horizontal line, and the design can effectively balance the pressure bearing of the sealing end face and parts and reduce the influence of the pressure of medium fluid on the deformation of the sealing end face.

As shown in fig. 1, a first transmission pin 1.3 arranged along the axial direction is arranged at the bottom of the assembling groove 1.2.1, a first transmission pin groove 1.1.1 matched with the first transmission pin 1.3 is arranged at the tail end of the rotating ring main body 1.1, so that the power transmission of the rotating ring main body 1.1 by the rotating ring seat 1.2 is realized, and an anti-rotation effect is also realized on the rotating ring main body 1.1.

In addition, as shown in fig. 3 and 4, the bottom of the first mounting groove 3.1 and the bottom of the second mounting groove 3.2 are respectively provided with an anti-rotation pin 8, and the rear ends of the first stationary ring 2 and the second stationary ring 4 are correspondingly provided with anti-rotation pin holes matched with the anti-rotation pins 8, so that an anti-rotation effect of each stationary ring is realized.

As shown in fig. 1, one end of the rotating shaft near the second rotating ring 5 is provided with a limiting step and a second transmission pin 9, the second rotating ring 5 is provided with a corresponding second transmission pin groove 5.1, after the second rotating ring 5 is axially installed into the limiting step, the second transmission pin 9 is matched in the second transmission pin groove 5.1, and a sealing ring is arranged between the inner side wall of the second rotating ring 5 and the outer side wall of the rotating shaft, so that the sealing connection between the second rotating ring 5 and the rotating shaft is realized.

As shown in fig. 2, 5, 6, and 7, a positioning groove 3.3 is provided on a side of the stationary ring seat 3 near the outer end surface of the pump cavity, and in this embodiment, the positioning groove 3.3 is formed by milling a notch on a side of the stationary ring seat 3 near the atmosphere end.

The outer terminal surface of pump chamber is equipped with prevents changeing dog 10, prevents changeing the dog 10 and is equipped with the locating piece 10.1 that is used for cooperating with constant head tank 3.3, and this structure has effectively realized the effect of preventing changeing of stationary ring seat 3. More specifically, still be equipped with ring groove 3.5 on the outer terminal surface of stationary ring seat 3, be equipped with corresponding arc snap ring 10.2 on preventing changeing dog 10, wherein, locating piece 10.1 is located the middle part position of arc snap ring 10.2 to locating piece 10.1 protrusion in the plane at arc snap ring 10.2 place on the axial direction, the constant head tank 3.3 of seting up on this locating piece 10.1 and the stationary ring seat 3 cooperatees. During the connection, will prevent changeing dog 10 along the perpendicular to pivot put the direction towards quiet ring seat 3 displacement, until arc snap ring 10.2 cooperation in ring groove 3.5 to locating piece 10.1 cooperation is in constant head tank 3.3, and the installation back that targets in place will prevent changeing dog 10 fixed connection on the outer terminal surface of pump chamber, realizes preventing changeing the connection to quiet ring seat 3, and prevents changeing simple structure, easy dismounting.

On the other hand, as shown in fig. 2 and 3, in this embodiment, a liquid inlet hole 101 and a liquid outlet hole 102 are formed in the outer side wall of the stationary ring seat 3, two flushing flow channels 3.4 communicating with the first mounting groove 3.1 and the second mounting groove 3.2 are axially formed in the inner side wall of the stationary ring seat 3, and the two flushing flow channels 3.4 are respectively communicated with the liquid inlet hole 101 and the liquid outlet hole 102. According to the novel double-end-face sealing structure, the flushing flow channel 3.4 is axially arranged in the static ring seat 3, and the two flushing flow channels 3.4 are respectively communicated with the first mounting groove 3.1 and the second mounting groove 3.2, namely, the flushing flow channel 3.4 is communicated with the positions of the main seal and the auxiliary seal; therefore, the flushing liquid/isolation liquid can be more timely and fully lubricated to the main sealing surface and the auxiliary sealing surface, the friction heat of the sealing surfaces is reduced, and the thermal deformation of the end surfaces is avoided; meanwhile, foreign matters on the end face and impurities attached to the small spring 6 can be taken away in time, and the impurities are prevented from being accumulated on the end face and being blocked and corroded by the small spring 6, so that the sealing is guaranteed to operate in a stable working condition, the sealing performance is guaranteed, and the service life of the sealing is prolonged.

In addition: in the above description, the end of the moving and static rings for forming the seal wear surface is referred to as the leading end, and the end facing away from the seal wear surface is referred to as the trailing end.

While the above is directed to the preferred embodiment of the present invention, it is not intended that it be limited, except as by the appended claims. The present invention is not limited to the above embodiments, and the specific structure thereof allows for changes, all the changes made within the protection scope of the independent claims of the present invention are within the protection scope of the present invention.

Claims (7)

1. The utility model provides a two-sided mechanical seal for impulse type twin-screw pump which characterized in that: the sealing device comprises a first movable ring (1), a first stationary ring (2), a stationary ring seat (3), a second stationary ring (4) and a second movable ring (5) which are sequentially sleeved on a rotating shaft, wherein one end of the stationary ring seat (3) is provided with a first mounting groove (3.1), the first stationary ring (2) is hermetically and slidably assembled in the first mounting groove (3.1), and a sealing surface of the first stationary ring (2) is attached to a sealing surface of the first movable ring (1) to form a main sealing grinding surface; a second mounting groove (3.2) is formed in the other end of the static ring seat (3), the second static ring (4) is matched in the second mounting groove (3.2) in a sealing and sliding mode, and a sealing surface of the second static ring (4) is attached to a sealing surface of the second movable ring (5) to form an auxiliary sealing grinding surface; elastic compensation components are arranged between the tail end of the first static ring (2) and the first installation groove (3.1) and between the tail end of the second static ring (4) and the second installation groove (3.2).

2. The double-ended mechanical seal for a pusher-type twin-screw pump according to claim 1, characterized in that: first rotating ring (1) include rotating ring main part (1.1) and rotating ring seat (1.2), rotating ring seat (1.2) on be equipped with and join in marriage dress groove (1.2.1), the sealed cooperation of one end that first quiet ring (2) was kept away from in joining in marriage dress groove (1.2.1) to rotating ring main part (1.1).

3. A twin-face mechanical seal for a pusher twin-screw pump according to claim 2, wherein: a sealing ring is arranged between the radial outer side wall of the movable ring main body (1.1) and the inner side wall of the assembling groove (1.2.1); and a tetrafluoro gasket (1.4) is arranged between the bottom of the assembling groove (1.2.1) and the tail end of the movable ring main body (1.1).

4. The double-ended mechanical seal for a pusher-type twin-screw pump according to claim 1, characterized in that: the one end of nearly second rotating ring (5) is equipped with limit step and second transmission round pin (9) in the pivot, be equipped with corresponding second transmission cotter way (5.1) on second rotating ring (5), after limit step was packed into along the axial in second rotating ring (5), second transmission round pin (9) cooperation in second transmission cotter way (5.1).

5. The double-ended mechanical seal for a pusher-type twin-screw pump according to claim 1, characterized in that: one side of the static ring seat (3) close to the outer end face of the pump cavity is provided with a positioning groove (3.3), the outer end face of the pump cavity is provided with an anti-rotation stop block (10), and the anti-rotation stop block (10) is provided with a positioning block (10.1) matched with the positioning groove (3.3).

6. The double-ended mechanical seal for a pusher-type twin-screw pump according to claim 1, characterized in that: be equipped with feed liquor hole (101) and play liquid hole (102) on quiet ring seat (3) lateral wall, be equipped with washing runner (3.4) of two first mounting grooves of intercommunication (3.1) and second mounting groove (3.2) along the axial on quiet ring seat (3) inside wall, and two washing runner (3.4) communicate with feed liquor hole (101), play liquid hole (102) respectively.

7. The mechanical seal for a pusher-type twin-screw pump according to any one of claims 1 to 6, characterized in that: the elasticity compensation subassembly include a plurality of little springs (6), the bottom of first mounting groove (3.1), second mounting groove (3.2) all is equipped with a plurality of spring holes (7) along circumference, a plurality of little spring (6) one end cooperation in corresponding spring hole (7), the other end corresponds respectively the top lean on the tail end at first quiet ring (2), second quiet ring (4).

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