Sealing structure for submersible pump

Abstract

A sealing structure for a submersible pump, comprising an upper housing assembly (1) and a lower housing (2), which are fixed together by means of bolts. The sealing structure further comprises a first sealing ring (3), a second sealing ring (4), and a sealing gasket (5), wherein the first sealing ring (3) and the second sealing ring (4) are respectively arranged at two ends of the lower housing (2); the first sealing ring (3) is mounted in the lower housing (2) and is connected to the upper housing assembly (1); one end of the second sealing ring (4) is mounted in the lower housing (2), and the other end extends out of the lower housing (2); the shrinkage rates of both the first sealing ring (3) and the second sealing ring (4) are less than the shrinkage rate of the lower housing (2); and the sealing gasket (5) is arranged between the second sealing ring (4) and the lower housing (2). The sealing structure ensures the sealing performance of a submersible pump at room temperature and cold conditions, featuring high safety, reliability and wide applicability.

Description

Sealing structure for submerged pump TECHNICAL FIELD

[0001] The present application relates to the field of submerged pump, in particular to a sealing structure for submerged pump. BACKGROUND

[0002] The submerged pump includes upper shell assembly, lower shell, rotor and impeller, etc., the impeller is sleeved on the rotor, and both are installed in the upper shell assembly and the lower shell. At present, for the sealing of the submerged pump, generally only the lower shell is fixed with the upper shell assembly by bolts outside, which has no problem under normal temperature working condition, but when in low temperature working condition, i.e. cold state, the lower shell will shrink to cause the bolts to loosen and fail, which causes the sealing failure of the whole submerged pump and the problems of pressure relief, etc.

[0003] Therefore, it is necessary to design a sealing structure to avoid the above problems and ensure that the submerged pump can be normally used under normal temperature and cold state. SUMMARY

[0004] In view of the above problems existing in the prior art, the present application provides a sealing structure for submerged pump, which avoids the problem that the bolts will loosen and fail under cold state when only used for external sealing in the prior art, ensures the sealing under normal temperature and cold state, has strong sealing performance, ensures that the submerged pump can be normally used under normal temperature and cold state, is safe and reliable, and has strong applicability.

[0005] To achieve the above object, the embodiments of the present application adopt the following technical solutions:

[0006] A sealing structure for submerged pump, comprising an upper shell assembly and a lower shell, both of which are fixed by bolts, the sealing structure further comprises a first sealing ring, a second sealing ring and a sealing ring, the first sealing ring and the second sealing ring are respectively arranged at both ends of the lower shell, the first sealing ring is installed in the lower shell and connected with the upper shell assembly, one end of the second sealing ring is installed in the lower shell and the other end extends out of the lower shell, the shrinkage rates of the first sealing ring and the second sealing ring are both less than that of the lower shell, and the sealing ring is arranged between the second sealing ring and the lower shell.

[0007] According to one aspect of the present application, the first sealing ring and the second sealing ring are both made of iron-based material, and the lower shell is made of aluminum material.

[0008] According to one aspect of the present application, the lower shell is a rotary cylindrical structure, an installation cavity is arranged in the lower shell, an installation hole is arranged at the end of the lower shell, the first sealing ring is arranged in the installation cavity and in contact with the lower shell, and one end of the second sealing ring is arranged in the installation cavity and in contact with the lower shell and the other end extends out of the installation hole.

[0009] According to one aspect of the present application, a sealing groove is arranged on the second sealing ring, and the sealing ring is installed in the sealing groove.

[0010] According to one aspect of the present application, the second sealing ring comprises a main ring and a secondary ring, which are integrally connected, the main ring is arranged in the mounting cavity and in contact with the lower shell, and the secondary ring extends out of the mounting hole, and the sealing groove is arranged on the main ring.

[0011] According to one aspect of the present application, the lower shell is provided with an annular groove, and the first sealing ring is provided with a stepped protrusion arranged in the annular groove.

[0012] According to one aspect of the present application, the submersible pump comprises an impeller assembly arranged in the mounting cavity, and the first sealing ring and the second sealing ring are respectively arranged at two ends of the impeller assembly.

[0013] According to one aspect of the present application, the second sealing ring is provided with an auxiliary annular member fixed by bolts, and the auxiliary annular member is arranged at one end of the impeller assembly.

[0014] The advantages of the present application are as follows: at normal temperature, the upper shell assembly and the lower shell are fixed by bolts, and the sealing ring is arranged, so that normal sealing during use can be ensured; at low-temperature cold state, the first sealing ring, the second sealing ring and the sealing ring are arranged, and the shrinkage rates of the first sealing ring and the second sealing ring are both less than the shrinkage rate of the lower shell, that is, the shrinkage amount of the lower shell is greater than the shrinkage amounts of the first sealing ring and the second sealing ring, so that the lower shell tightly seals the first sealing ring, the second sealing ring and the sealing ring, the sealing at cold state is ensured, and the problem that the bolts only seal externally and are loose and invalid at cold state in the prior art is avoided; in this way, the sealing structure of the present application ensures sealing at normal temperature and at cold state, has strong sealing performance, ensures that the submersible pump can be normally used at normal temperature and at cold state, is safe and reliable, and has strong applicability. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiments will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative effort on the basis of these drawings.

[0016] Fig. 1 is a structural schematic view of the present application.

[0017] The names corresponding to the serial numbers in the drawings are as follows: 1, upper shell assembly; 2, lower shell; 21, mounting cavity; 22, annular groove; 3, first sealing ring; 4, second sealing ring; 41, main ring; 42, secondary ring; 5, sealing ring; 6, auxiliary annular member; 7, impeller assembly. DETAILED DESCRIPTION

[0018] With reference to the drawings and the embodiments of the present application, the technical solutions in the embodiments of the present application will be described clearly and completely. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by a person of ordinary skill in the art without creative effort belong to the scope of the present application.

[0019] As shown in FIG. 1, a sealing structure for a submerged pump includes an upper housing assembly 1, a lower housing 2, a first seal ring 3, a second seal ring 4, and a sealing ring 5. The upper housing assembly 1 and the lower housing 2 are fixed by circumferentially arranged bolts. The first seal ring 3 and the second seal ring 4 are respectively located at the upper and lower ends of the lower housing 2. The first seal ring 3 is installed in the lower housing 2 and connected to the upper housing assembly 1 by fasteners. The upper end of the second seal ring 4 is installed in the lower housing 2, and the lower end extends out of the lower housing 2. The shrinkage rates of the first seal ring 3 and the second seal ring 4 are both less than the shrinkage rate of the lower housing 2. Thus, in a cold state, the shrinkage amount of the lower housing 2 is greater than the shrinkage amounts of the first seal ring 3 and the second seal ring 4. At this time, the lower housing 2 will tightly seal the first seal ring 3 and the second seal ring 4. The sealing ring 5 is arranged between the second seal ring 4 and the lower housing 2, so as to ensure the sealing at room temperature with the above-mentioned bolts.

[0020] In actual application, the first seal ring 3 and the second seal ring 4 are made of iron-based material, and the lower housing 2 is made of aluminum material. Thus, in a cold state, the shrinkage amount of the lower housing 2 is greater than the shrinkage amounts of the first seal ring 3 and the second seal ring 4.

[0021] In actual application, the lower housing 2 is a rotary cylindrical structure. The lower housing 2 is internally provided with a cylindrical mounting cavity 21, and a circular mounting hole is formed at the central position of the lower end of the lower housing 2. The first seal ring 3 is arranged in the mounting cavity 21 and in contact with the lower housing 2, so as to facilitate the extrusion sealing of the lower housing 2 to the first seal ring 3 in a cold state. The upper end of the second seal ring 4 is arranged in the mounting cavity 21 and in contact with the lower housing 2, and the lower end of the second seal ring 4 extends out of the mounting hole, so as to facilitate the extrusion sealing of the lower housing 2 to the second seal ring 4 in a cold state.

[0022] In actual application, the first seal ring 3 and the second seal ring 4 are both rotary parts. An annular groove 22 is arranged on the upper end of the inner wall of the lower housing 2 or above the mounting cavity 21. The first seal ring 3 is provided with a plurality of concentrically arranged stepped protrusions along the axial direction (or vertically downward). The stepped protrusions are arranged in the annular groove 22. Thus, the positioning and installation of the first seal ring 3 and the lower housing 2 are facilitated, and the extrusion sealing of the two is facilitated.

[0023] In practical application, the second sealing ring 4 comprises a main ring 41 and a sub-ring 42, the main ring 41 is arranged in the mounting cavity 21 and in contact with the inner wall of the lower end of the lower shell 2, and the sub-ring 42 is sleeved and extends out of the mounting hole; the bottom of the main ring 41 is provided with an annular sealing groove, and the sealing ring 5 is arranged in the sealing groove.

[0024] In practical application, the submersible pump comprises an impeller assembly 7, which is arranged in the mounting cavity 21, and the first sealing ring 3 and the second sealing ring 4 (the main ring 41) are respectively arranged at the upper and lower ends of the impeller assembly 7.

[0025] In practical application, the main ring 41 of the second sealing ring 4 is provided with a stepped groove, and the auxiliary annular part 6 is arranged in the stepped groove, the structures of the two are matched with each other, and the two are fixed by a bolt fastener; the auxiliary annular part 6 is arranged at the lowermost side of the impeller assembly 7.

[0026] The advantages of the embodiment of the present application are as follows: at normal temperature, the upper shell assembly 1 and the lower shell 2 are fixed by bolts, and the sealing ring 5 is arranged, so that normal sealing during use can be ensured; at low-temperature cold state, the first sealing ring 3, the second sealing ring 4 and the sealing ring 5 are arranged, and the shrinkage rates of the first sealing ring 3 and the second sealing ring 4 are both less than the shrinkage rate of the lower shell 2, that is, the shrinkage amount of the lower shell 2 is greater than the shrinkage amounts of the first sealing ring 3 and the second sealing ring 4, so that the lower shell 2 tightly seals the first sealing ring 3, the second sealing ring 4 and the sealing ring 5, the sealing at cold state is ensured, and the problem that the bolt sealing at the outside in the prior art is loose and fails at cold state is avoided; in this way, the sealing structure of the present application ensures the sealing at normal temperature and at cold state, has strong sealing performance, ensures that the submersible pump can be normally used at normal temperature and at cold state, is safe and reliable, and has strong applicability.

[0027] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited to this, any person skilled in the art can easily think of changes or replacements within the technical range disclosed in the present application, which should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A sealing structure for a submerged pump, comprising an upper casing assembly (1) and a lower casing (2) fixed by bolts, characterized in that, The sealing structure further comprises a first seal ring (3), a second seal ring (4) and a sealing ring (5), the first seal ring (3) and the second seal ring (4) are respectively arranged at two ends of the lower shell (2), the first seal ring (3) is mounted in the lower shell (2) and connected with the upper shell assembly (1), one end of the second seal ring (4) is mounted in the lower shell (2) and the other end extends out of the lower shell (2), the shrinkage rates of the first seal ring (3) and the second seal ring (4) are both less than the shrinkage rate of the lower shell (2), and the sealing ring (5) is arranged between the second seal ring (4) and the lower shell (2).

2. The seal structure for a submerged liquid pump according to claim 1, wherein The first seal ring (3) and the second seal ring (4) are both made of iron-based material, and the lower shell (2) is made of aluminum material.

3. The seal structure for a submerged liquid pump according to claim 1, wherein The lower shell (2) is a rotary cylinder structure, the lower shell (2) is provided with a mounting cavity (21), the lower shell (2) is provided with a mounting hole at an end, the first seal ring (3) is arranged in the mounting cavity (21) and in contact with the lower shell (2), one end of the second seal ring (4) is arranged in the mounting cavity (21) and in contact with the lower shell (2), and the other end extends out of the mounting hole.

4. The seal structure for a submerged liquid pump according to claim 3, wherein The second seal ring (4) is provided with a sealing groove, and the sealing ring (5) is mounted in the sealing groove.

5. The seal structure for a submerged liquid pump according to claim 4, wherein The second seal ring (4) comprises a main ring (41) and a secondary ring (42), which are integrally connected, the main ring (41) is arranged in the mounting cavity (21) and in contact with the lower shell (2), the secondary ring (42) extends out of the mounting hole, and the sealing groove is arranged on the main ring (41).

6. The seal structure for a submerged liquid pump according to claim 1, wherein The lower shell (2) is provided with an annular groove (22), and the first seal ring (3) is provided with a stepped protrusion, the stepped protrusion is arranged in the annular groove (22).

7. The seal structure for a submerged liquid pump according to claim 6, wherein The submersible pump comprises an impeller assembly (7), the impeller assembly (7) is arranged in the mounting cavity (21), and the first seal ring (3) and the second seal ring (4) are respectively arranged at two ends of the impeller assembly (7).

8. The seal structure for a submerged liquid pump according to claim 7, wherein The second seal ring (4) is provided with an auxiliary annular member (6), and the two are fixed by bolts, the auxiliary annular member (6) is arranged at one end of the impeller assembly (7).

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