A sealing structure for a submersible pump

Abstract

The present invention discloses a sealing structure for a submersible pump, which relates to the field of submersible pumps, including an upper shell assembly and a lower shell, which are fixed by bolts. The sealing structure also includes 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 two ends of the lower shell, the first sealing ring is installed in the lower shell and connected to 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 smaller than the shrinkage rate of the lower shell, and the sealing ring is arranged between the second sealing ring and the lower shell. The present invention avoids the problem of loosening and failure in cold state when only bolt sealing is used on the outside in the prior art, ensures sealing at normal temperature and cold state, has strong sealing performance, ensures that the submersible pump can be used normally at normal temperature and cold state, is safe and reliable, and has strong applicability.

Description

Technical Field

[0001] The invention relates to the field of submersible pumps, and in particular to a sealing structure for submersible pumps. Background Art

[0002] The submersible pump includes an upper housing assembly, a lower housing, a rotor, an impeller, etc. The impeller is sleeved on the rotor, and the two are installed together in the upper housing assembly and the lower housing. At present, for the sealing of the submersible pump, the lower housing is generally only fixed to the upper housing assembly by bolts on the outside, which is no problem under normal temperature conditions, but when it is in a low temperature condition, that is, in a cold state, the lower housing will shrink, causing the bolts to loosen and fail, that is, the sealing of the entire submersible pump fails, and pressure relief and other problems occur.

[0003] Therefore, it is necessary to design a sealing structure to avoid the above problems and ensure that the submersible pump can be used normally at room temperature and in cold state. Summary of the invention

[0004] In view of the above-mentioned deficiencies that currently exist, the present invention provides a sealing structure for a submersible pump, which avoids the problem in the prior art that only external bolt sealing will loosen and fail in a cold state, ensures sealing at normal temperature and cold state, has strong sealing performance, and ensures that the submersible pump can be used normally at normal temperature and cold state, is safe, reliable and has strong applicability.

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

[0006] A sealing structure for a submersible pump comprises an upper shell assembly and a lower shell, which are fixed by bolts. The sealing structure also 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 two ends of the lower shell. The first sealing ring is installed in the lower shell and connected to 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 smaller than the shrinkage rate of the lower shell. The sealing ring is arranged between the second sealing ring and the lower shell.

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

[0008] According to one aspect of the present invention, the lower shell is a rotating cylindrical structure, a mounting cavity is provided in the lower shell, a mounting hole is opened at the end of the lower shell, the first sealing ring is arranged in the mounting cavity and in contact with the lower shell, one end of the second sealing ring is arranged in the mounting cavity and in contact with the lower shell, and the other end extends out of the mounting hole.

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

[0010] According to one aspect of the present invention, the second sealing ring includes a main ring and a secondary ring, which are integrally connected. The main ring is arranged in the installation cavity and contacts the lower shell, the secondary ring extends out of the installation hole, and the sealing groove is arranged on the main ring.

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

[0012] According to one aspect of the present invention, the submersible pump includes an impeller assembly, the impeller assembly is disposed in a mounting cavity, and the first sealing ring and the second sealing ring are respectively disposed at two ends of the impeller assembly.

[0013] According to one aspect of the present invention, an auxiliary annular member is provided on the second sealing ring, and the two are fixed by bolts. The auxiliary annular member is provided at one end of the impeller assembly.

[0014] The advantages of the implementation of the present invention are as follows: at room temperature, by fixing the upper shell assembly and the lower shell with bolts and by setting a sealing ring, etc., normal sealing during use can be ensured; in a low-temperature cold state, by setting a first sealing ring, a second sealing ring, and a sealing ring, and by setting the shrinkage rates of the first sealing ring and the second sealing ring to be smaller than the shrinkage rate of the lower shell, that is, the shrinkage of the lower shell is greater than the shrinkage of the first sealing ring and the second sealing ring, the lower shell will be tightly sealed with the first sealing ring, the second sealing ring, and the sealing ring, ensuring the sealing in the cold state, avoiding the problem of loosening and failure in the cold state when only bolt sealing is used on the outside in the prior art; in this way, the present sealing structure ensures sealing in both normal temperature and cold state, has strong sealing performance, ensures that the submersible pump can be used normally in both normal temperature and cold state, is safe and reliable, and has strong applicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0016] Figure 1 It is a structural schematic diagram of the present invention.

[0017] The names corresponding to the serial numbers in the figure are as follows:

[0018] 1. Upper housing assembly; 2. Lower housing; 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 ring; 7. Impeller assembly. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] like Figure 1 As shown, a sealing structure for a submersible pump comprises an upper shell assembly 1, a lower shell 2, a first sealing ring 3, a second sealing ring 4, and a sealing ring 5; the upper shell assembly 1 and the lower shell 2 are fixed by circumferentially arranged bolts, the first sealing ring 3 and the second sealing ring 4 are respectively located at the upper and lower ends of the lower shell 2, the first sealing ring 3 is installed in the lower shell 2 and is connected to the upper shell assembly 1 by fasteners, the upper end of the second sealing ring 4 is installed in the lower shell 2, and the lower end penetrates and extends out of the lower shell 2; the shrinkage rates of the first sealing ring 3 and the second sealing ring 4 are both smaller than the shrinkage rate of the lower shell 2, so that in the cold state, the shrinkage amount of the lower shell 2 is greater than the shrinkage amount of the first sealing ring 3 and the second sealing ring 4, at which time the lower shell 2 will hug the first sealing ring 3, the second sealing ring 4, etc. and seal; the sealing ring 5 is arranged between the second sealing ring 4 and the lower shell 2, so that it can ensure sealing at room temperature together with the above-mentioned bolts.

[0021] In practical applications, the first sealing ring 3 and the second sealing ring 4 are both made of iron-based materials, and the lower shell 2 is made of aluminum; thus, in a cold state, the shrinkage of the lower shell 2 is greater than that of the first sealing ring 3 and the second sealing ring 4 .

[0022] In actual application, the lower shell 2 is a rotating cylindrical structure, a columnar installation cavity 21 is provided inside the lower shell 2, and a circular hole-shaped installation hole is opened at the central position of the lower end of the lower shell 2; the first sealing ring 3 is arranged in the installation cavity 21 and contacts with the lower shell 2, so as to facilitate the lower shell 2 to squeeze and seal against the first sealing ring 3 in a cold state; the upper end of the second sealing ring 4 is arranged in the installation cavity 21 and contacts with the lower shell 2, and the lower end of the second sealing ring 4 extends out of the installation hole, so as to facilitate the lower shell 2 to squeeze and seal against the second sealing ring 4 in a cold state.

[0023] In practical applications, the first sealing ring 3 and the second sealing ring 4 are both rotating parts. An annular groove 22 is provided at the upper end of the inner wall of the lower housing 2 or above the mounting cavity 21, and the first sealing ring 3 is provided with a series of concentrically arranged stepped protrusions along the axial direction (or vertically downward), and the stepped protrusions are arranged in the annular groove 22; in this way, the first sealing ring 3 and the lower housing 2 are conveniently positioned and installed, and the extrusion seal between the two is convenient.

[0024] In actual application, the second sealing ring 4 includes an integrally formed main ring 41 and a secondary ring 42. The main ring 41 is arranged in the installation cavity 21 and contacts the inner wall of the lower end of the lower shell 2, and the secondary ring 42 is sleeved and extends out of the installation hole; an annular sealing groove is provided at the bottom of the main ring 41, and the sealing ring 5 is installed in the sealing groove.

[0025] In practical applications, the submersible pump includes an impeller assembly 7 , which is disposed in the installation cavity 21 , and the first sealing ring 3 and the second sealing ring 4 (main ring 41 ) are respectively located at the upper and lower ends of the impeller assembly 7 .

[0026] In actual application, a stepped groove is provided on the main ring 41 of the second sealing ring 4, and an auxiliary ring member 6 is provided in the stepped groove. The structural shapes of the two are adapted to each other, and the two are fixed by bolt-like fasteners; the auxiliary ring member 6 is provided at the lowermost side of the impeller assembly 7.

[0027] Advantages of the implementation of the present invention: at room temperature, by fixing the upper shell assembly 1 and the lower shell 2 with bolts and by setting the sealing ring 5, etc., normal sealing during use can be ensured; in a low-temperature cold state, by setting the first sealing ring 3, the second sealing ring 4, and the sealing ring 5, and at the same time setting the shrinkage rates of the first sealing ring 3 and the second sealing ring 4 to be smaller than the shrinkage rate of the lower shell 2, that is, the shrinkage of the lower shell 2 is greater than the shrinkage of the first sealing ring 3 and the second sealing ring 4, at this time, the lower shell 2 will be tightly sealed with the first sealing ring 3, the second sealing ring 4, and the sealing ring 5, ensuring the sealing in the cold state, avoiding the problem of loosening and failure in the cold state when only bolt sealing is used on the outside in the prior art; in this way, the present sealing structure ensures sealing at room temperature and cold state, has strong sealing performance, ensures that the submersible pump can be used normally at room temperature and cold state, is safe and reliable, and has strong applicability.

[0028] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by any technician familiar with the art within the technical scope disclosed in the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A sealing structure for a submersible pump, comprising an upper housing assembly (1) and a lower housing assembly (2), the two being fixed by bolts, characterized in that: The sealing structure further comprises a first sealing ring (3), a second sealing ring (4) and a sealing ring (5); the first sealing ring (3) and the second sealing ring (4) are respectively arranged at two ends of the lower shell (2); the first sealing ring (3) is coaxially placed in the lower shell (2) and connected to the upper shell assembly (1); an annular groove (22) is arranged in the lower shell (2); a stepped protrusion is arranged on the first sealing ring (3), and the stepped protrusion is arranged in the annular groove (22); the second sealing ring (4) is coaxially sleeved with the lower shell (2); the upper end of the second sealing ring (4) is installed in the lower shell (2), and the lower end penetrates and protrudes out of the lower shell (2); the lower shell The housing (2) is provided with a mounting cavity (21), the end of the lower housing (2) is provided with a mounting hole, the first sealing ring (3) is arranged in the mounting cavity (21) and in contact with the lower housing (2), one end of the second sealing ring (4) is arranged in the mounting cavity (21) and in contact with the lower housing (2), and the other end extends out of the mounting hole; the shrinkage rates of the first sealing ring (3) and the second sealing ring (4) are both smaller than the shrinkage rate of the lower housing (2), the first sealing ring (3) and the second sealing ring (4) are both made of iron-based materials, the lower housing (2) is made of aluminum material, and the sealing ring (5) is arranged between the second sealing ring (4) and the lower housing (2).

2. The sealing structure according to claim 1, characterized in that: The lower shell (2) is a rotary cylinder structure.

3. The sealing structure according to claim 2, characterized in that: The second sealing ring (4) is provided with a sealing groove, and the sealing ring (5) is installed in the sealing groove.

4. The sealing structure according to claim 3, characterized in that: The second sealing 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).

5. The sealing structure according to claim 1, characterized in that: The submersible pump comprises an impeller assembly (7), wherein the impeller assembly (7) is arranged in an installation cavity (21), and the first sealing ring (3) and the second sealing ring (4) are respectively arranged at two ends of the impeller assembly (7).

6. The sealing structure according to claim 5, characterized in that: An auxiliary annular component (6) is provided on the second sealing ring (4), and the two are fixed by bolts. The auxiliary annular component (6) is provided at one end of the impeller assembly (7).

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