CN217080890U - Self-tightening sealed water outlet section and double-shell pump comprising same - Google Patents

Abstract

The utility model relates to a self-tightening sealed water outlet section and a double-shell pump comprising the same.A middle-pressure fluid channel and a high-pressure fluid channel are arranged on the water outlet section, the water outlet section part between two outlets of the middle-pressure fluid channel and the high-pressure fluid channel is formed into a sealing contact section, the outer circumferential surfaces of the water outlet section parts at two sides of the sealing contact section are respectively formed into an inner flow cavity contact section and an outer flow cavity contact section, and the outlet of the high-pressure fluid channel is positioned on the outer flow cavity contact section; the outflow cavity contact section is provided with a circle of annular stress groove in a concave mode, the inner wall of one side, close to the sealing contact section, of the annular stress groove forms a self-tightening force transmission surface, the self-tightening force transmission surface extends towards the direction of the sealing contact section in an inclined mode along the radial direction inwards of the outflow section, and the self-tightening force transmission surface extends into the sealing contact section. When the self-tightening force transfer surface sealing device is used, the acting force of high-pressure fluid on the self-tightening force transfer surface can extrude and deform the sealing contact section outside the self-tightening force transfer surface to make up for the sealing gap between the contact surfaces, so that the problem of overlarge radial gap between the contact surfaces can be solved, and the effect of improving the sealing performance is achieved.

Description

Self-tightening sealed water outlet section and double-shell pump comprising same

Technical Field

The utility model belongs to the technical field of non-positive displacement pump among the mechanical engineering, concretely relates to from tight sealed play water section and contain this two shell pump that go out water section.

Background

The double-shell multistage centrifugal pump is widely applied due to compact structure, good axial balance and high pumping capacity. A double-casing multistage centrifugal pump generally includes an outer casing and an inner casing mounted within the outer casing, with a pump shaft rotating portion mounted within the inner casing. The inner shell generally comprises a water inlet section, a low-pressure middle section, a water outlet section, a high-pressure middle section and a high-pressure water inlet section which are sequentially arranged along the axial direction of the pump, and the rotating part of the pump shaft generally comprises a pump shaft, a low-pressure impeller (front impeller), a high-pressure impeller (rear impeller) and a necessary shaft sleeve. When the device is used, a fluid medium is sucked through the pump inlet, is gradually pressurized into medium-pressure fluid through the low-pressure impeller, the medium-pressure fluid is collected by the low-pressure liquid collecting ring cavity on one side of the water outlet section and then passes through the medium-pressure fluid channel in the water outlet section to enter the inner flow cavity between the water outlet section (and the high-pressure middle section) and the inner wall of the outer shell, then the fluid is gradually pressurized into high-pressure fluid through the high-pressure impeller in the opposite direction, the high-pressure fluid is collected by the high-pressure liquid collecting ring cavity on the other side of the water outlet section and then passes through the high-pressure fluid channel in the water outlet section to enter the outflow cavity between the water outlet section and the inner wall of the outer shell, and finally flows out through the outflow cavity and the pump inlet. The prior art such as CN201003505Y and CN 202203174U, CN 112283148A are all concerned.

Referring to fig. 1, on the outer circumferential surface of the water outlet section 1, the outer circumferential surface of the water outlet section between the outlets of the medium pressure fluid passage 11 and the high pressure fluid passage 12 needs to be in supporting contact with the inner wall of the outer casing 100, and a sealing structure needs to be provided to effectively separate the aforementioned inner flow cavity 101 and the outlet flow cavity 102. The sealing structure adopts an O-shaped sealing ring 2 for sealing between contact surfaces, and mechanical calculation analysis shows that due to the existence of fluid (including fluid in the inner flow cavity 101 and fluid in the outlet flow cavity 102) between the water outlet section 1 and the inner wall of the outer shell 100, the outer shell 100 expands outwards under internal pressure to deform, the radial deformation is 0.1-0.2mm, even more than 0.2mm, and the radial gap between the contact surfaces is enlarged due to the reduction of deformation of the water outlet section 1 under external pressure, and in addition, the gap required by self-designed assembly is reduced, the sealing effect is reduced, even the gap exceeds the elastic sealing range of the O-shaped sealing ring, so that the O-shaped sealing ring can not realize sealing theoretically.

The prior art (e.g. CN 202203174U) also has a step provided on the outer circumferential surface of the water outlet section between the outlets of the medium-pressure fluid passage 11 and the high-pressure fluid passage 12 to form an axial sealing surface, and the sealing is achieved by winding a gasket. However, when the axial gap is increased, the sealing effect is also reduced, and the problem of the increase in the radial gap due to the fluid pressure still remains.

Disclosure of Invention

The above-mentioned not enough to prior art, the to-be-solved technical problem of the utility model is to provide a from tight sealed play water section and contain this two shell body pump that go out the water section, improve because of fluid pressure can cause the too big problem in radial clearance between play water section and the shell body inner wall contact surface, gain the effect of being convenient for improve sealing performance.

In order to solve the technical problem, the utility model adopts the following technical scheme:

the self-tightening sealing water outlet section is provided with a medium-pressure fluid channel and a high-pressure fluid channel, the water outlet section between two outlets of the medium-pressure fluid channel and the high-pressure fluid channel is formed into a sealing contact section, the outer circumferential surfaces of the water outlet section at two sides of the sealing contact section are respectively formed into an inner flow cavity contact section and an outflow cavity contact section, the outlet of the medium-pressure fluid channel is positioned on the inner flow cavity contact section, and the outlet of the high-pressure fluid channel is positioned on the outflow cavity contact section; the water outlet cavity is characterized in that a circle of annular stress groove is concavely formed in the water outlet cavity contact section, the inner wall of one side, close to the sealing contact section, of the annular stress groove forms a self-tightening force transmission surface, and the self-tightening force transmission surface extends towards the direction of the sealing contact section in an inclined mode along the radial direction of the water outlet section and extends into the sealing contact section.

The utility model also relates to a double-shell pump, which comprises an outer shell and an inner shell arranged on the outer shell, wherein an annular inner flow cavity and an annular outflow cavity are formed between the inner wall of the outer shell and the inner shell; the water outlet section in the inner shell is the self-tightening sealed water outlet section, and the outer circumferential surface of the sealing contact section of the water outlet section corresponds to the inner wall section of the outer shell between the inner flow cavity and the outflow cavity; the annular stress groove is communicated with the outflow cavity;

and an O-shaped sealing ring is clamped between one circle of outer circumferential surface of the sealing contact section outside the self-tightening force transmission surface and the corresponding inner wall of the outer shell body outwards along the radial direction of the water outlet section.

Compared with the prior art, the utility model discloses following beneficial effect has:

the utility model discloses a from tight sealed play water section, set up annular atress groove on the chamber contact segment of effluenting, the slope of the tight power transmission face in annular atress groove extends to the inboard that is used for supporting the sealed contact section of contact with double-shell multistage centrifugal pump, during the use, annular atress groove nature and the chamber intercommunication of effluenting, the effort of high-pressure fluid on the tight power transmission face has along radial outside component, can be with the sealed contact section part extrusion deformation in the tight power transmission face outside of oneself and go to compensate the seal clearance between the contact surface, thereby can improve and lead to the fact the too big problem in radial clearance between play water section and the shell body inner wall contact surface because of fluid pressure among the current structure, do benefit to the effect of getting the improvement sealing performance of being convenient for.

Drawings

FIG. 1 is a schematic view of a seal between a prior art double shell pump of the background art and a water outlet section within the pump;

FIG. 2 is a schematic diagram of a dual housing pump with a self-sealing discharge section according to an exemplary embodiment;

the water outlet section 1, the medium-pressure fluid channel 11, the high-pressure fluid channel 12, the inner flow cavity contact section 13, the sealing contact section 14, the outflow cavity contact section 15, the annular stress groove 16, the self-tightening force transmission surface 161, the outer shell 100, the inner flow cavity 101, the outflow cavity 102 and the O-shaped sealing ring 2 are arranged in the shell.

Detailed Description

The following describes the present invention in further detail with reference to the accompanying drawings.

Referring to fig. 2, in the self-sealing water outlet section of the specific embodiment, the water outlet section 1 is provided with a medium-pressure fluid channel 11 and a high-pressure fluid channel 12, a water outlet section between two outlets of the medium-pressure fluid channel 11 and the high-pressure fluid channel 12 is formed as a sealing contact section 14, outer circumferential surfaces of water outlet sections on two sides of the sealing contact section 14 are respectively formed as an inner flow cavity contact section 13 and an outlet flow cavity contact section 15, an outlet of the medium-pressure fluid channel 11 is located on the inner flow cavity contact section 13, and an outlet of the high-pressure fluid channel 12 is located on the outlet flow cavity contact section 15; the outflow cavity contact section 15 is concavely provided with a ring of annular stress groove 16, the inner wall of one side of the annular stress groove 16 close to the sealing contact section 14 is formed into a self-tightening force transmission surface 161, and the self-tightening force transmission surface 161 extends inwards along the radial direction of the outflow section 1 and slantingly towards the direction of the sealing contact section 14 and extends into the sealing contact section 14.

In the self-tightening sealed water outlet section of the embodiment, the contact section 15 of the water outlet cavity is provided with the annular stress groove 16, the self-tightening force transmission surface 161 of the annular stress groove 16 obliquely extends to the inner side of the sealing contact section 14 for supporting and contacting with the double-shell multistage centrifugal pump, when the self-tightening sealed water outlet section is used, the annular stress groove 16 is communicated with the water outlet cavity 102, the acting force of the pressure of high-pressure fluid on the self-tightening force transmission surface 161 has a component force which is outward in the radial direction, and the sealing contact section 14 on the outer side of the self-tightening force transmission surface 161 can be partially extruded and deformed (slightly elastically deformed) to make up a sealing gap between the contact surfaces, so that the problem that the radial gap between the contact surfaces of the water outlet section 1 and the inner wall of the outer shell 100 is too large due to the fluid pressure in the existing structure can be solved, and the effect of improving the sealing performance is facilitated.

It should be noted that the two "water outlet section parts" appearing in the foregoing are a whole word concept, and do not refer to "a part of the water outlet section 1" (there is no sentence break between the water outlet section/parts), but: the section of the water outlet section between the two outlets of the medium-pressure fluid channel 11 and the high-pressure fluid channel 12 is the section of the water outlet section on both sides of the sealing contact section, namely the water outlet section.

With reference to fig. 2, the present invention further provides a double-casing pump, which includes an outer casing 100 and an inner casing installed on the outer casing 100, an annular inner flow cavity 101 and an annular outflow cavity 102 are formed between the inner wall of the outer casing 100 and the inner casing, and the inner flow cavity 101 and the outflow cavity 102 are separated by a water outlet section in the inner casing; the water outlet section in the inner shell adopts the self-tightening sealed water outlet section 1, and one circle of outer circumferential surface of the sealing contact section 14 corresponds to the inner wall section of the outer shell 100 between the inner flow cavity 101 and the outflow cavity 102; the annular force-bearing groove 16 is communicated with the outflow cavity 102; specifically, the inner flow chamber contact section 13 corresponds to the inner flow chamber 101, the outlet of the medium-pressure fluid passage 11 communicates with the inner flow chamber 101, the outlet flow chamber contact section 15 corresponds to the outlet flow chamber 102, and the outlet of the high-pressure fluid passage 12 communicates with the outlet flow chamber 102.

And an O-shaped sealing ring 2 is clamped between one circle of outer circumferential surface of the sealing contact section 14 outside the self-tightening force transmission surface 161 and the corresponding inner wall of the outer shell 100 outwards along the radial direction of the water outlet section 1.

The double-shell pump of the embodiment has the same technical effects as the above, and the details are not repeated herein; when the theoretical clearance is reduced to be smaller than the maximum clearance elastically adapted by the O-shaped sealing ring 2, the O-shaped sealing ring 2 can ensure effective sealing. In this way, the number of the retainer rings (the sealing steps on the water outlet section 1 and the inner wall of the outer housing 100) can be reduced, and the manufacturing cost of the pump can be reduced. In addition, the arrangement of the annular stress groove 16 can also increase the overflowing area of the discharged water, reduce the flow velocity, reduce the hydraulic impact at the position and be beneficial to reducing the scouring wear and impact vibration of the pump.

In this embodiment, an annular groove for accommodating and positioning the O-ring 2 is formed on the outer circumferential surface of the seal contact section 14, and the O-ring 2 is disposed in the annular groove; in practice, the ring groove may be formed on the inner wall of the outer casing 100.

In practice, the inclination angle of the self-tightening force transmission surface 161 and the thickness of the sealing contact section 14 outside the self-tightening force transmission surface 161 radially outward of the water outlet section 1 can be matched according to the designed high-pressure fluid pressure in the pump with specific power, and specific machining dimensions can be realized, which is not limited herein.

Finally, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the present invention can be modified or replaced by other means without departing from the spirit and scope of the present invention, which should be construed as limited only by the appended claims.

Claims (2)

1. The self-tightening sealing water outlet section is characterized in that a medium-pressure fluid channel (11) and a high-pressure fluid channel (12) are arranged on the water outlet section (1), the water outlet section between two outlets of the medium-pressure fluid channel (11) and the high-pressure fluid channel (12) is formed into a sealing contact section (14), the outer circumferential surfaces of the water outlet section on two sides of the sealing contact section (14) are respectively formed into an inner flow cavity contact section (13) and an outflow cavity contact section (15), the outlet of the medium-pressure fluid channel (11) is positioned on the inner flow cavity contact section (13), and the outlet of the high-pressure fluid channel (12) is positioned on the outflow cavity contact section (15); the method is characterized in that: the water outlet cavity contact section (15) is provided with a circle of annular stress groove (16) in a concave mode, the inner wall of one side, close to the sealing contact section (14), of the annular stress groove (16) forms a self-tightening force transmission surface (161), and the self-tightening force transmission surface (161) extends towards the direction of the sealing contact section (14) in an inclined mode along the radial direction of the water outlet section (1) inwards and extends into the sealing contact section (14).

2. A double-shell pump comprises an outer shell (100) and an inner shell arranged on the outer shell (100), wherein an annular inner flow cavity (101) and an annular outlet flow cavity (102) are formed between the inner wall of the outer shell (100) and the inner shell; the method is characterized in that: the water outlet section in the inner shell is the self-tightening sealed water outlet section (1) of claim 1, the outer circumferential surface of the sealing contact section (14) of the water outlet section corresponds to the inner wall section of the outer shell between the inner flow cavity (101) and the outlet flow cavity (102); the annular stress groove (16) is communicated with the outflow cavity (102);

an O-shaped sealing ring (2) is clamped between one circle of outer circumferential surface of the sealing contact section (14) outside the self-tightening force transmission surface (161) and the corresponding inner wall of the outer shell body outwards along the radial direction of the water outlet section (1).

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