Pump body and motor connection sealing structure

Abstract

The utility model belongs to the technical field of magnetic drive pumps, and particularly relates to a pump body and motor connection sealing structure which comprises a rear shell, a motor cylinder body, a rear shell isolation sleeve, a pump body, a concave sealing ring, an annular groove sealing ring and a gap sealing ring. The rear shell isolation sleeve is sleeved in the motor cylinder body, the rear shell and the motor cylinder body form a binding surface, the binding surface is provided with an annular groove with a concave cross section, the concave sealing ring is arranged in the annular groove, and the concave sealing ring is arranged in the annular groove. The annular groove sealing ring is installed between the rear shell, the motor cylinder body and the pump body, the gap sealing ring is installed between the pump body and the rear shell isolation sleeve, and the components are sealed through the sealing rings to form a triple sealing structure. And internal and external liquid leakage and internal permeation corrosion to the end face of the motor cylinder body are effectively prevented, and equipment safety is effectively protected.

Description

Technical Field

[0001] The utility model belongs to the technical field of magnetic pumps, and in particular relates to a sealing structure for connecting a pump body and a motor. Background Art

[0002] Sealing structures are widely used in many fields and are very practical. The Chinese patent publication number CN103782020A discloses an invention called "Sealing Structure of Fuel Pump", which relates to a sealing structure of a fuel pump. The sealing structure of the fuel pump is a double sealing structure in which an external seal and an internal seal are separately arranged, which can make the assembly of the two seals good and the setting area of ​​the double seal compact. A double seal is arranged between the fuel pump insertion port and the flange of the fuel pump, and the double seal includes an external seal and an internal seal that is separately arranged from the external seal. An inner protrusion of the external seal protruding radially inward is arranged on the external seal, and an outer protrusion of the internal seal protruding radially outward is arranged on the internal seal, and a cutout is provided as a positioning portion in which each protrusion is embedded, and each protrusion is alternately arranged along the circumferential direction of the seal and is located within the same width in the radial direction.

[0003] Although the sealing structure of the invention has double sealing protection and can effectively prevent the leakage of external liquid and internal liquid, when the internal liquid leaks, due to the obstruction of the two inner and outer rubber pads, the leaked liquid stays on the end face of the motor, and then corrodes the end face of the motor. In the long run, it not only affects the use, but also poses a serious safety hazard.

[0004] Therefore, it is necessary to improve the prior art. Utility Model Content

[0005] The utility model aims to provide a sealing structure for connecting a pump body and a motor, aiming to solve the technical problem in the prior art that liquid penetrates the seal and stays on the end surface of the equipment, causing corrosion.

[0006] To achieve the above-mentioned purpose, an embodiment of the utility model provides a pump body and motor connection sealing structure, comprising a rear shell, a motor cylinder, a rear shell isolation sleeve, a pump body, a concave sealing ring, an annular groove sealing ring and a gap sealing ring, the rear shell is provided with a accommodating cavity matching the motor cylinder, the motor cylinder is installed in the accommodating cavity, the rear shell isolation sleeve is sleeved in the motor cylinder, the rear shell and the motor cylinder form a fitting surface, an annular groove with a concave cross-section is provided on the fitting surface, the concave sealing ring has a concave cross-section, a circumferential protrusion, fits in the annular groove, and is in sealing contact with the annular groove ; An annular connecting portion is provided at a position of the pump body corresponding to the annular groove, and an annular docking portion is provided on the rear shell isolation sleeve, the annular connecting portion sealingly contacts the radially outer side surface of the concave sealing ring and the end surface of the rear shell, and the annular groove sealing ring is also provided between the annular connecting portion and the concave sealing ring; the annular docking portion sealingly contacts the radially inner side surface of the concave sealing ring and the end surface of the rear shell, and an inner cavity is formed between the pump body and the rear shell isolation sleeve, and the gap sealing ring is provided in the inner cavity; the sealing ring is tightly connected between the rear shell, the motor cylinder body, the rear shell isolation sleeve and the pump body.

[0007] Optionally, the rear shell is provided with a first annular step at a position corresponding to the annular groove, and the motor cylinder is provided with a second annular step at a position corresponding to the annular groove, the second annular step is 0.4-1 mm lower than the end face of the motor cylinder, and the radial end of the second annular step is further recessed to form a third annular step, and the first annular step, the second annular step and the third annular step constitute the annular groove.

[0008] Optionally, the central portion of the concave sealing ring is in sealing contact with the end face of the motor cylinder body, that is, in close contact with the second annular step, and the circumferential protrusion of the concave sealing ring forms an outer protrusion and an inner protrusion, both of which are narrow on the left and wide on the right.

[0009] Optionally, the annular connecting portion abuts against the outer protrusion of the concave sealing ring and the end face of the rear shell, and at the same time abuts against the middle position of the concave sealing ring, and the annular docking portion abuts against the inner protrusion and the end face of the motor cylinder body, and the annular connecting portion, the annular docking portion and the concave sealing ring are all in interference fit sealing contact.

[0010] Optionally, an annular groove is further provided at the center of the annular connecting portion, the annular groove is fitted to the outer side of the concave sealing ring, and the annular groove sealing ring is arranged in the annular groove.

[0011] Optionally, the gap sealing ring is installed in the inner cavity formed at the junction of the rear shell isolation sleeve and the pump body.

[0012] The above one or more technical solutions in the sealing structure for connecting the pump body and the motor provided by the embodiment of the utility model have at least one of the following technical effects: by recessing the second annular step portion of the motor cylinder by 0.4-1 mm and sealing with the above-mentioned sealing ring, the sealing effect of the annular connecting portion between the motor cylinder and the pump body is greatly improved, and the gaps between the components are tightly connected, which greatly avoids the leakage and penetration of internal and external liquids, greatly avoids the corrosion of the motor end face, and effectively protects the safety of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. 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 paying creative labor.

[0014] Figure 1 A schematic diagram of the rear shell and pump body structure of the pump body and motor connection sealing structure provided in an embodiment of the utility model;

[0015] Figure 2 for Figure 1 Sectional view along line AA;

[0016] Figure 3 For the utility model embodiment Figure 2 A partial enlarged view of point B in the middle;

[0017] Figure 4 A schematic diagram of the structure of the motor cylinder of the pump body and the motor connection sealing structure provided by the embodiment of the utility model;

[0018] Figure 5 for Figure 4 Sectional view of the midline CC.

[0019] Among them, the reference numerals in the figure are:

[0020] 10. Rear shell; 11. Accommodating cavity; 20. Motor cylinder; 30. Rear shell isolation sleeve; 31. Annular docking portion; 40. Pump body; 41. Annular connecting portion; 41a. Annular groove; 50. Concave sealing ring; 51. External protrusion; 52. Internal protrusion; 60. Fitting surface; 61. Annular groove; 61a. First annular step; 61b. Second annular step; 61c. Third annular step; 70. Annular groove sealing ring; 80. Gap sealing ring; 90. Inner cavity. DETAILED DESCRIPTION

[0021] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the embodiments of the present invention, and should not be construed as limiting the present invention.

[0022] In the description of the embodiments of the present invention, it should be understood that if there are directional indications in the embodiments of the present invention, such as up, down, left, right, front, back, inside, outside, etc., the directions or positional relationships indicated are based on the directions or positional relationships shown in the accompanying drawings. This is only for the convenience of describing the embodiments of the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, it should not be understood as a limitation on the present invention.

[0023] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present utility model, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0024] In the embodiments of the present invention, unless otherwise clearly specified and limited, if there are terms such as "installed", "connected", "connected", "fixed", etc., they should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0025] In one embodiment of the present invention, Figures 1 to 5As shown, a sealing structure for connecting a pump body and a motor is provided, comprising a rear shell 10, a motor cylinder 20, a rear shell isolation sleeve 30, a pump body 40, a concave sealing ring 50, an annular groove sealing ring 70 and a gap sealing ring 80. The rear shell 10 is provided with a receiving cavity 11 matching the motor cylinder 20, the motor cylinder 20 is installed in the receiving cavity 11, the rear shell isolation sleeve 30 is sleeved in the motor cylinder 20, the rear shell 10 and the motor cylinder 20 form a fitting surface 60, an annular groove 61 with a concave cross section is provided on the fitting surface 60, the concave sealing ring 50 has a concave cross section, circumferentially protrudes, fits in the annular groove 61, and is sealed with the annular groove 61 An annular connecting portion 41 is provided at a position of the pump body 40 corresponding to the annular groove 61, and an annular docking portion 31 is provided on the rear shell isolation sleeve 30. The annular connecting portion 41 seals and contacts the radially outer side of the concave sealing ring 50 and the end face of the rear shell 10, and an annular groove sealing ring 70 is also provided between the annular connecting portion 41 and the concave sealing ring 50; the annular docking portion 31 seals and contacts the radially inner side of the concave sealing ring 50 and the end face of the rear shell 10, and an inner cavity 90 is formed between the pump body 40 and the rear shell isolation sleeve 30, and a gap sealing ring 80 is provided in the inner cavity 90; the sealing ring is tightly connected between the rear shell 10, the motor cylinder body 20, the rear shell isolation sleeve 30 and the pump body 40.

[0026] In this embodiment, if Figures 2-3 As shown, the position of the rear shell 10 corresponding to the annular groove 61 is provided with a first annular step 61a, and the position of the motor cylinder 20 corresponding to the annular groove 61 is provided with a second annular step 61b, and the second annular step 61b is 0.4-1 mm lower than the end face of the motor cylinder 20, and in this embodiment, it is specifically concave by 0.7 mm. The radial end of the second annular step 61b is further concave to form a third annular step 61c, and the first annular step 61a, the second annular step 61b and the third annular step 61c form the annular groove 61. The design that the second annular step 61b is lower than the end face of the motor cylinder 20 can make the concave sealing ring 50 not too high above the end face of the motor cylinder 20 when it fits with the annular groove 61, and can make the annular connecting portion 41 and the annular docking portion 31 closely contact and seal the annular groove 61, and can also closely fit the rear shell 10 and the motor cylinder 20, so as to better protect the end faces of the motor cylinder 20 and the rear shell 10.

[0027] In this embodiment, if Figure 3As shown, the center part of the concave sealing ring 50 is in sealing contact with the end face of the motor cylinder 20, that is, in close contact with the second annular step 61b, which better protects the end face and avoids corrosion as much as possible. The concave sealing ring 50 circumferentially protrudes to form an external protrusion 51 and an internal protrusion 52, both of which are narrow on the left and wide on the right. When the pump body 40 and the rear shell isolation sleeve 30 are connected to the motor cylinder 20 and the rear shell 10, the concave sealing ring 50 is stressed, the narrow part on the left side of the protrusion is resisted, and the wide part on the right side is stressed to expand evenly to both sides, and closely contact the inner wall of the annular groove 61, thereby effectively preventing the liquid outside the equipment from leaking into the inside and causing corrosion to the motor.

[0028] In this embodiment, if Figure 3 As shown, the annular connecting portion 41 abuts against the side of the outer protrusion 51 of the concave sealing ring 50 and the end surface of the rear shell 10, and also abuts against the middle position of the concave sealing ring 50, and the annular docking portion 31 abuts against the inner protrusion 52 and the end surface of the motor cylinder 20, and the annular connecting portion 41, the annular docking portion 31 and the concave sealing ring 31 are all in sealing contact with interference fit. The design here more tightly seals the gap of the connection structure.

[0029] Preferably, an annular groove 41a is further provided at the center of the annular connecting portion 41, and the annular groove 41a is fitted to the side of the concave sealing ring 50. The annular groove sealing ring 70 is provided in the annular groove 41a to tightly contact and seal the annular groove 41a. When the magnetic pump is working, the annular groove sealing ring 70 can effectively prevent internal or external liquid from leaking and penetrating here, thereby effectively preventing the end face of the motor from being corroded.

[0030] Preferably, a gap sealing ring 80 is provided in the inner cavity 90 formed by the annular docking portion 31 of the rear shell isolation sleeve 30 and the pump body 40. This sealing ring is provided to achieve contact sealing between the rear shell isolation sleeve 30 and the pump body 40, effectively preventing liquid leakage inside the equipment, thereby greatly avoiding corrosion of the motor.

[0031] The above-mentioned concave sealing ring 50, annular groove sealing ring 70 and gap sealing ring 80 form a triple seal, which effectively prevents internal or external liquid leakage and internal liquid from penetrating into the end face of the motor cylinder body, thereby greatly avoiding equipment corrosion.

[0032] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A sealing structure for connecting a pump body and a motor, comprising a rear shell (10), a motor cylinder (20), a rear shell isolation sleeve (30), a pump body (40), a concave sealing ring (50), a ring groove sealing ring (70) and a gap sealing ring (80), wherein the rear shell (10) is provided with a receiving cavity (11) matching the motor cylinder (20), the motor cylinder (20) is installed in the receiving cavity (11), the rear shell isolation sleeve (30) is sleeved in the motor cylinder (20), the rear shell (10) and the motor cylinder (20) form a fitting surface (60), characterized in that: The fitting surface (60) is provided with an annular groove (61) with a concave cross section. The concave sealing ring (50) has a concave cross section and circumferential protrusions. It fits in the annular groove (61) and is in sealing contact with the annular groove (61). The pump body (40) is provided with an annular connecting portion (41) at a position corresponding to the annular groove (61). The rear shell isolation sleeve (30) is provided with an annular docking portion (31). The annular connecting portion (41) is in sealing contact with the radially outer side surface of the concave sealing ring (50) and the end surface of the rear shell (10). The annular groove sealing ring (70) is also provided between the annular connecting portion (41) and the concave sealing ring (50); the annular docking portion (31) seals and contacts the radially inner side surface of the concave sealing ring (50) and the end surface of the rear shell (10), and an inner cavity (90) is formed between the pump body (40) and the rear shell isolation sleeve (30), and the gap sealing ring (80) is provided in the inner cavity (90); the sealing ring tightly connects the rear shell (10), the motor cylinder body (20), the rear shell isolation sleeve (30) and the pump body (40).

2. The pump body and motor connection sealing structure according to claim 1 is characterized in that: The rear housing (10) is provided with a first annular step (61a) at a position corresponding to the annular groove (61), and the motor cylinder (20) is provided with a second annular step (61b) at a position corresponding to the annular groove (61), the second annular step (61b) is 0.4-1 mm lower than the end surface of the motor cylinder (20), and the radial end of the second annular step (61b) is further recessed to form a third annular step (61c), and the first annular step (61a), the second annular step (61b) and the third annular step (61c) constitute the annular groove.

3. The pump body and motor connection sealing structure according to claim 2 is characterized in that: The central portion of the concave sealing ring (50) is in sealing contact with the end surface of the motor cylinder (20), that is, in close contact with the second annular step (61b), and the circumferential protrusion of the concave sealing ring (50) forms an outer protrusion (51) and an inner protrusion (52), both of which are narrow on the left and wide on the right.

4. The pump body and motor connection sealing structure according to claim 3 is characterized in that: The annular connecting portion (41) abuts against the outer protrusion (51) of the concave sealing ring (50) and the end surface of the rear shell (10), and also abuts against the middle position of the concave sealing ring (50); the annular docking portion (31) abuts against the inner protrusion (52) and the end surface of the motor cylinder body (20); and the annular connecting portion (41), the annular docking portion (31) and the concave sealing ring (50) are all in sealing contact with interference fit.

5. The pump body and motor connection sealing structure according to claim 1 is characterized in that: The annular connecting portion (41) is also provided with an annular groove (41a) at the center thereof. The annular groove (41a) is fitted to the outside of the concave sealing ring (50), and the annular groove sealing ring (70) is arranged in the annular groove.

6. The pump body and motor connection sealing structure according to claim 1, characterized in that: The gap sealing ring (80) is installed in the inner cavity (90) formed at the junction of the rear shell isolation sleeve (30) and the pump body (40).

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