Sealing structure of a submersible pump outlet section

Abstract

The utility model provides a kind of submersible pump water outlet section sealing structure, belong to water pump technical field, it solves the sealing reliability problem that existing submersible pump water outlet section meets pressure fluctuation and is easy to leak.The utility model includes by the upper section and lower section of cover cap compression connection, the lower section is equipped with convex end, it forms sealing cavity with water outlet passage, cavity bottom is equipped with spring seat hole, the upper section and lower section between arrangement relevant sealing structure, this structure is composed of lip seal ring and pressure piece, lip seal ring upper portion is equipped with 45 ° dynamic lip, lower portion is equipped with insertion port and the cylinder cooperation of pressure piece lower end;Pressure piece upper end arc platform and lip seal ring inner cavity bevel match, the spring of sealing cavity bottom provides initial pre-tightening force and continuous wear automatic compensation for sealing structure.The utility model.The utility model has the advantages that: through the self-tightening effect of dynamic lip and the automatic compensation mechanism of spring, realize the effect that sealing is tighter under high pressure, automatically compensates after wearing, significantly improve the sealing reliability and service life under vibration and pressure fluctuation working condition.

Description

Technical Field

[0001] This utility model belongs to the field of water pump technology, and relates to a submersible pump, particularly a submersible pump outlet sealing structure. Background Technology

[0002] Submersible pumps, especially high-power submersible pumps used for deep well water extraction, mine drainage, and agricultural irrigation, have a discharge section that is a key connecting component between the pump body and the external water delivery pipe, undertaking the core functions of flow guidance, pressure bearing, and sealing. The sealing reliability of this component directly determines the pump's working efficiency, service life, and operational safety.

[0003] In the prior art, to solve the problem of convenient replacement of the water outlet section and the water pipe connection, a "submersible pump with easily replaceable water outlet section" disclosed in Chinese patent CN206329507U has emerged. This solution simplifies the water pipe replacement process to a certain extent by designing the water outlet section as a separable upper and lower section and tightening it with a cover. Although this structure is easy to replace, its sealing method has shortcomings: relying solely on the static seal of a single gasket, the gasket is prone to plastic deformation or aging after long-term exposure to water pressure fluctuations and mechanical vibrations, leading to seal failure; secondly, this sealing structure lacks self-compensation capability. When the gasket is slightly worn, the sealing pressure will drop and cannot be automatically compensated, thus causing leakage.

[0004] Therefore, developing a more reliable and longer-lasting water outlet sealing structure has become an urgent problem to be solved in this field. Utility Model Content

[0005] The purpose of this invention is to address the aforementioned problems in the existing technology by providing a sealing structure for the outlet section of a submersible pump, which effectively solves the problem of sealing reliability issues in the outlet section of existing submersible pumps, which is prone to leakage when encountering pressure fluctuations.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] This utility model discloses a sealing structure for the outlet section of a submersible pump, including an outlet section. The outlet section includes an upper section for connecting to an external water pipe, a lower section for connecting to the pump body, and a cover for pressing the upper section against the lower section. The lower section has a protruding end, and a sealing cavity is formed between the protruding end and the outlet channel. The sealing cavity is composed of multiple spring seat holes at the bottom and the inner wall of the protruding end. A sealing structure is provided between the upper section and the lower section, and the sealing structure includes a lip sealing ring and a pressure component.

[0008] In the above-mentioned submersible pump outlet sealing structure, the lip sealing ring includes an upper part and a lower part. The upper part has a dynamic lip with an inclination angle of 45° on the side near the center. Under pressure, it can deform and achieve pressure self-tightening, thus improving the sealing effect. The lower part has an insertion port corresponding to the inner axial position of the dynamic lip. The insertion ports are symmetrically arranged on both sides of the lower part.

[0009] In the above-mentioned submersible pump outlet sealing structure, the pressure component includes an upper end and a lower end. The upper end is a circular arc platform, the curvature of which matches the 45° inclined surface of the inner cavity of the lip sealing ring. The lower end is a cylindrical rotating body that matches the insertion port and is symmetrically arranged on both sides of the pressure component. When the pressure inside the pump increases, the pressure acts on the back of the dynamic lip, converting it into a clamping force, thereby improving the pressure self-tightening effect.

[0010] In the above-mentioned submersible pump outlet sealing structure, a spring is axially fitted in the spring seat hole at the bottom of the sealing cavity. The spring is pressed tightly against the sealing structure to maintain the long-term stability of the sealing pressure.

[0011] In the above-mentioned submersible pump outlet sealing structure, a sealing head is provided at the end where the upper and lower sections are connected. The sealing head is adapted to the cavity formed by the lip sealing ring and the pressure component.

[0012] In the above-mentioned submersible pump outlet sealing structure, a shoulder is provided at the end of the upper section that contacts the cover.

[0013] In the above-mentioned submersible pump outlet section sealing structure, the sleeve is connected to the lower section of the outlet section by threads, and the pressing surface at its inner end directly acts on the shoulder of the upper section to precisely press the sealing head into the sealing structure.

[0014] Compared with existing technologies, the submersible pump outlet sealing structure provided by this utility model has the following beneficial effects: the main sealing ring and lip sealing ring form multiple sealing barriers, and the system water pressure is used to achieve a self-tightening effect where the higher the pressure, the tighter the seal, which greatly improves the sealing reliability under vibration and pressure fluctuations; the built-in spring can automatically compensate for the wear and deformation of the sealing components, always maintain a stable sealing pressure, and significantly extend the service life and maintenance cycle of the sealing components. Attached Figure Description

[0015] Figure 1 This is the front view of this utility model;

[0016] Figure 2 This is a cross-sectional view of the present invention;

[0017] Figure 3 This is the front view of the lower section of this utility model;

[0018] Figure 4This is an exploded view of the sealing structure in this utility model;

[0019] Figure 5 This is a top view of the upper section of this utility model;

[0020] Among them, 1. Water outlet section; 2. Upper section; 21. Sealing head; 22. Shoulder; 3. Lower section; 31. Sealing cavity; 311. Spring seat hole; 312. Bottom; 32. Protruding end; 4. Cover; 5. Sealing structure; 51. Pressure component; 511. Upper end; 512. Lower end; 52. Lip sealing ring; 521. Upper part; 521a. Dynamic lip; 522. Lower part; 522a. Insertion port; 6. Spring; 7. Water outlet channel. Detailed Implementation

[0021] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings to further illustrate the technical solution of the present invention. However, the described embodiments are only a part of the embodiments of the present invention.

[0022] In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified. Furthermore, the terms "installed," "connected," and "linked" should be interpreted broadly; for example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0023] like Figure 1 and Figure 2 As shown, the present invention provides a sealing structure 5 for a submersible pump outlet section 1. The structure includes an outlet section 1, which is assembled from three main components: an upper section 2 for connecting to an external water pipe, a lower section 3 fixedly connected to the pump body, and a cover 4 that presses the upper section 2 against the lower section 3. The upper part 521 of the lower section 3 is provided with an integrally formed protruding end 32. The inner wall of the protruding end 32 and the outer wall of the central outlet channel 7 form an annular sealing cavity 31.

[0024] like Figure 3 As shown, the bottom 311 of the sealing cavity 31 is provided with a plurality of spring seat holes 31 evenly distributed along the circumference. In the sealing cavity 31, a plurality of springs 6 are axially installed in each of the spring seat holes 31 of the bottom 311. The upper end 511 of each spring 6 presses against the bottom surface of the pressure member 51, providing it with a continuous upward axial preload.

[0025] like Figure 5As shown, the upper section 2 and the lower section 3 are connected by a downwardly extending sealing head 21. The outer diameter of the sealing head 21 is adapted to the inner diameter of the sealing cavity 31, so that when the upper section 2 is assembled, its sealing head 21 can extend into the sealing cavity 31 of the lower section 3. On the outer wall of the upper section 2, there is a radially protruding shoulder 22, which is used to mate with the inner end face of the cover 4.

[0026] like Figure 2 As shown, the sleeve cover 4 is screwed into the external thread of the upper part 521 of the protruding end 32 of the lower section 3 through its internal thread. When the sleeve cover 4 is rotated clockwise, the annular pressing surface at its inner end will abut against the shoulder 22 of the upper section 2 and apply a continuous axial pressure, thereby firmly pressing the sealing head 21 of the upper section 2 into the predetermined position of the sealing cavity 31. A sealing structure 5 is provided between the upper section 2 and the lower section 3 in the sealing cavity 31.

[0027] like Figure 4 As shown, the sealing structure 5 is composed of a lip-shaped sealing ring 52 and a pressure member 51. The lip-shaped sealing ring 52 is made of a wear-resistant and aging-resistant elastic material. Its structure is divided into a sealing part 521 and a supporting part 522. The inner side of the sealing part is designed with a dynamic lip 521a with an inclination angle of 45°. In the free state, the inner diameter of the dynamic lip 521a is slightly smaller than the outer diameter of the sealing head 21 of the upper section 2, so as to form an initial interference fit and pre-seal after installation. Two insertion ports 522a are symmetrically opened on both sides of the support part. The pressure element 51 is usually made of metal or high-strength engineering plastic. Structurally, it includes an upper end 511 and a lower end 512. The upper end 511 is a circular arc platform structure. Its convex arc surface is precisely calculated to fit with the 45° inclined surface of the inner cavity of the lip sealing ring 52. The lower end 512 consists of two symmetrically distributed cylindrical rotating bodies. Their dimensions are precisely matched with the insertion ports 522a of the lip sealing ring 52, so that the pressure element 51 can drive the lip sealing ring 52 to move synchronously, but mainly bears and transmits axial force.

[0028] In the sealed cavity 31, multiple springs 6 are axially installed in the respective spring seat holes 31 of the bottom 311. The upper end 511 of each spring 6 presses against the bottom surface of the pressure member 51, providing it with a continuous upward axial preload.

[0029] The working principle of this utility model is as follows: First, align the two lower ends 512 of the pressure member 51 with the two insertion ports 522a of the lip seal ring 52, and combine the two into an integral sealing structure 5. Then, place this assembly into the sealing cavity 31 of the lower section 3. At this time, the spring 6 is compressed between the bottom 311 of the spring 6 seat hole 31 and the pressure member 51. Next, align and press the sealing head 21 of the upper section 2 into the central cavity formed by the lip seal ring 52 and the pressure member 51. Finally, screw on the cover 4. The cover 4 tightens the lower section 3 by thread and presses the shoulder 22 of the upper section 2 with its inner end face, thereby pressing the sealing head 21 completely and accurately into the working position, completing the assembly of the entire component.

[0030] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A sealing structure for the outlet section of a submersible pump, comprising an outlet section (1), characterized in that: The water outlet section (1) includes an upper section (2) for connecting to an external water pipe, a lower section (3) for connecting to a pump body, and a cover (4) for pressing the upper section (2) against the lower section (3). The lower section (3) has a protruding end (32), and a sealing cavity (31) is formed between the protruding end (32) and the water outlet channel (7). The sealing cavity (31) is composed of a plurality of spring seat holes (311) provided at the bottom (312) and the inner wall of the protruding end (32). A sealing structure (5) is provided between the upper section (2) and the lower section (3). The sealing structure (5) includes a lip sealing ring (52) and a pressure element (51).

2. The submersible pump outlet sealing structure according to claim 1, characterized in that: The lip-shaped sealing ring (52) includes an upper part (521) and a lower part (522). The upper part (521) has a dynamic lip (521a) with an inclination angle of 45° on one side near the center. The lower part (522) has an insertion port (522a) at a position corresponding to the inner axial position of the dynamic lip (521a). The insertion ports (522a) are symmetrically arranged on both sides of the lower part (522).

3. The submersible pump outlet sealing structure according to claim 2, characterized in that: The pressure component (51) includes an upper end (511) and a lower end (512). The upper end (511) is a circular arc platform, the curvature of which is adapted to the 45° inclined surface of the inner cavity of the lip sealing ring (52). The lower end (512) is a cylindrical rotating body that cooperates with the insertion port (522a) and is symmetrically arranged on both sides of the pressure component (51).

4. The submersible pump outlet sealing structure according to claim 1, characterized in that: A spring (6) is axially fitted in the spring seat hole (311) of the bottom (312), and the spring (6) is pressed into the sealing structure (5).

5. The submersible pump outlet sealing structure according to claim 1, characterized in that: A sealing head (21) is provided at one end of the upper section (2) connected to the lower section (3). The sealing head (21) is adapted to the cavity formed by the lip sealing ring (52) and the pressure member (51).

6. The submersible pump outlet sealing structure according to claim 1, characterized in that: The upper section (2) is provided with a shoulder (22) at the end that contacts the cover (4).

7. The submersible pump outlet sealing structure according to claim 1, characterized in that: The cover (4) is connected to the lower section (3) of the water outlet section (1) by threads.

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