CN209781280U - Spiral packing double-sealing structure of centrifugal pump - Google Patents

Abstract

The utility model discloses a centrifugal pump spiral packing double seal structure locates between multistage centrifugal pump's pump shaft and the packing letter body, including spiral shaft sleeve, screw gland and filler. The spiral shaft sleeve is sleeved on the pump shaft, threads are arranged on the outer surface of the spiral shaft sleeve along the circumferential direction, the inner wall of the central hole of the spiral gland is parallel to the outer surface of the spiral shaft sleeve, a gap is kept between the inner wall of the central hole of the spiral gland and the outer surface of the spiral shaft sleeve, and the spiral shaft sleeve and the spiral gland form a first heavy sealing structure. And a packing cavity is arranged at the inner end between the spiral shaft sleeve and the packing box body and close to the spiral gland, and packing is loaded in the packing cavity to form a second resealing structure. The utility model discloses centrifugal pump spiral packing double seal structure is through setting up helical structure and setting up reasonable clearance fit on the axle sleeve, combines the sealed double seal structure that forms of packing, makes to let out leakage quantity obviously reduce, and the water of leaking can not splash, avoids packing to leak and leaks and splash to influence the lubricated effect of bearing in the bearing gland.

Description

Spiral packing double-sealing structure of centrifugal pump

Technical Field

The utility model relates to a pump seal technical field especially relates to a centrifugal pump spiral packing double seal structure.

Background

The centrifugal pump integrates more than two centrifugal pumps with the same function, and the fluid channel structure is represented by that a medium pressure relief opening of a first stage is communicated with an inlet of a second stage, and a medium pressure relief opening of the second stage is communicated with an inlet of a third stage, so that a mechanism connected in series forms the multi-stage centrifugal pump. As shown in figure 1, the sealing structure of the multistage centrifugal pump, the external end of the central hole of the gland 11 is set to be an inclined opening 12, and only the packing seal is adopted, in the actual use process, leaked water can splash everywhere, and part of water can splash into the bearing gland to influence the bearing lubrication effect

Disclosure of Invention

In view of this, the utility model aims at providing a centrifugal pump spiral packing double seal structure.

In order to achieve the above purpose, the utility model provides a following technical scheme:

The utility model relates to a centrifugal pump spiral packing double-sealing structure, which is arranged between a pump shaft and a packing box body of a multistage centrifugal pump and comprises a spiral shaft sleeve, a spiral gland and packing; the screw shaft sleeve is sleeved on the pump shaft, threads are arranged on the outer surface of the screw shaft sleeve along the circumferential direction, the threads are arranged close to the outer end of the packing box body, the screw gland is coaxially sleeved on the screw shaft sleeve through a central hole corresponding to the threads, the inner wall of the central hole of the screw gland is parallel to the outer surface of the screw shaft sleeve, a gap is kept between the inner wall of the central hole of the screw gland and the outer surface of the screw shaft sleeve, and the screw shaft sleeve and the screw gland form a first heavy seal structure; and a packing cavity is arranged at the inner end between the spiral shaft sleeve and the packing box body and close to the spiral gland, and the packing is loaded in the packing cavity to form a second resealing structure.

Further, the clearance distance between the inner wall of the spiral gland and the outer surface of the spiral shaft sleeve is 1mm to 1.5 mm.

Furthermore, the thread is a trapezoidal thread, namely the cross section of the thread opening is trapezoidal.

The beneficial effects of the utility model reside in that: the utility model discloses centrifugal pump spiral packing double seal structure is through setting up helical structure and setting up reasonable clearance fit on the axle sleeve, combines the sealed double seal structure that forms of packing, makes to let out leakage quantity obviously reduce, and the water of leaking can not splash, avoids packing to leak and leaks and splash to influence the lubricated effect of bearing in the bearing gland.

Drawings

in order to make the purpose, technical scheme and beneficial effect of the utility model clearer, the utility model provides a following figure explains:

Fig. 1 is a schematic view of a sealing structure of a centrifugal pump of the prior art.

Fig. 2 is the double-sealing structure schematic diagram of the spiral packing of the centrifugal pump of the utility model.

Fig. 3 is a partially enlarged view of fig. 2.

In the figure, 11 is a gland, 12 is an oblique opening, 1 is a spiral shaft sleeve, 2 is a spiral gland, 3 is packing, 4 is a pump shaft, 5 is a packing box body, and 10 is a thread.

Detailed Description

The present invention will be further described with reference to the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and can implement the present invention, but the embodiments are not to be construed as limiting the present invention.

As shown in FIG. 2 and FIG. 3, the utility model relates to a centrifugal pump spiral packing double seal structure, which is arranged between a pump shaft 4 and a packing box body 5 of a multistage centrifugal pump, and comprises a spiral shaft sleeve 1, a spiral gland 2 and packing 3. The spiral shaft sleeve 1 is sleeved on the pump shaft 4, threads 10 are arranged on the outer surface of the spiral shaft sleeve 1 along the circumferential direction, and the threads 10 are arranged close to the outer end of the packing box body 5. In the in-service use in-process, the right side of the filler box body is the high pressure side in the drawing, and the left side is the low pressure side, and water can leak to the left side through the gap between the part, because this embodiment comes to carry out the spiral direction to the water that leaks through screw thread 10, and the experiment shows, the water production that can effectively avoid leaking out of is guided through the spiral to water to screw thread 10 on the swivel nut 1 splashes, and the water that leaks promptly does not produce and splashes. The screw gland 2 is coaxially sleeved on the screw shaft sleeve 1 through a central hole corresponding to the thread 10, the inner wall of the central hole of the screw gland 2 is parallel to the outer surface of the screw shaft sleeve 1, a gap is kept between the inner wall and the outer surface of the screw shaft sleeve 1, and the screw shaft sleeve 1 and the screw gland 2 form a first heavy seal structure. A packing cavity is arranged at the inner end between the spiral shaft sleeve 1 and the packing box body and close to the spiral gland 2, and packing 3 is loaded in the packing cavity to form a second resealing structure. The leakage amount of water can be further reduced by the double sealing structure.

In the present embodiment, the clearance distance between the inner wall of the screw cap 2 and the outer surface of the swivel nut 1 is 1mm to 1.5mm, and the splashing of water can be optimally controlled by the thread 10 structure of the swivel nut 1 and fitting the optimal clearance.

Preferably, the thread 10 is a trapezoidal thread, i.e. the cross-sectional shape of the thread mouth is trapezoidal.

The utility model discloses centrifugal pump spiral packing double seal structure is through setting up helical structure and setting up reasonable clearance fit on the axle sleeve, combines the sealed double seal structure that forms of packing, makes to let out leakage quantity obviously reduce, and the water of leaking can not splash, avoids packing to leak and leaks and splash to influence the lubricated effect of bearing in the bearing gland. Of course, the double seal structure of the present invention can be applied to single-stage or multistage centrifugal pumps.

The above-mentioned embodiments are merely preferred embodiments for fully illustrating the present invention, and the scope of the present invention is not limited thereto. Equivalent substitutes or changes made by the technical personnel in the technical field on the basis of the utility model are all within the protection scope of the utility model. The protection scope of the present invention is subject to the claims.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, when used in the orientation or positional relationship indicated in the figures, are used merely for convenience in describing the invention and to simplify the description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered as limiting. Furthermore, the appearances of the terms "first," "second," and the like, if any, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

In the description of the present invention, it should be noted that unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" should be interpreted broadly, e.g., as being fixed or detachable 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 by those of ordinary skill in the art through specific situations.

Claims (3)

1. a centrifugal pump spiral packing double-seal structure is characterized in that: the spiral gland packing box is arranged between a pump shaft and a packing box body of the multistage centrifugal pump and comprises a spiral shaft sleeve, a spiral gland and packing; the screw shaft sleeve is sleeved on the pump shaft, threads are arranged on the outer surface of the screw shaft sleeve along the circumferential direction, the threads are arranged close to the outer end of the packing box body, the screw gland is coaxially sleeved on the screw shaft sleeve through a central hole corresponding to the threads, the inner wall of the central hole of the screw gland is parallel to the outer surface of the screw shaft sleeve, a gap is kept between the inner wall of the central hole of the screw gland and the outer surface of the screw shaft sleeve, and the screw shaft sleeve and the screw gland form a first heavy seal structure; and a packing cavity is arranged at the inner end between the spiral shaft sleeve and the packing box body and close to the spiral gland, and the packing is loaded in the packing cavity to form a second resealing structure.

2. A centrifugal pump spiral packing double seal structure according to claim 1, characterized in that: the clearance distance between the inner wall of the spiral gland and the outer surface of the spiral shaft sleeve is 1mm to 1.5 mm.

3. A centrifugal pump spiral packing double seal structure according to claim 2, characterized in that: the thread is a trapezoidal thread, namely the cross section of a thread opening is trapezoidal.