Water pump with multiple sealing structure
By designing a multi-seal structure, utilizing a pressure chamber and an elastic plate to enhance the sealing effect, the problem of liquid leakage under high pressure in single-stage mechanical seals is solved, achieving better sealing performance.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- NANJING HUAMING ENERGY SAVING & ENVIRONMENTAL PROTECTION CO LTD
- Filing Date
- 2025-08-08
- Publication Date
- 2026-07-21
AI Technical Summary
The existing single-stage mechanical seal structure of water pumps is difficult to effectively prevent liquid leakage under high pressure conditions, especially when the liquid volume is large, the sealing effect is poor.
It adopts a multi-layer sealing structure, including components such as air chamber, elastic plate, sealing block and water baffle. It uses air pressure instead of elastic elements to squeeze the sealing block, combined with a tortuous liquid outflow path, to enhance the sealing effect.
Under high pressure, it ensures that the liquid is not easily leaked, significantly improves the sealing effect, prevents the liquid from flowing out through gaps, and improves the sealing performance of the water pump.
Smart Images
Figure CN224533061U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of water pumps, and in particular to a water pump with a multi-seal structure. Background Technology
[0002] A water pump is a mechanical device used to transport or pressurize liquids. It is driven by a power source to rotate an impeller or other working parts at high speed. It uses centrifugal force or the pressure difference generated by reciprocating motion to transport water, oil, chemical liquids, etc. from a low place to a high place, or from a low-pressure area to a high-pressure area.
[0003] Since the driving components of a water pump are often located on the outside of its pump casing, a gap inevitably exists between its output shaft and the pump casing. To prevent liquid from leaking out through the gap during the pump's operation, it is often necessary to seal the gap.
[0004] Currently, most existing water pumps achieve sealing effects through single-stage mechanical seals. However, due to the large centrifugal force inside the water pump and its outlet being located at the top, when a large amount of water or other liquid is drawn in, the liquid can easily flow out through gaps under internal pressure. Existing mechanical seals only use a single elastic element to compress the seal, which can easily affect the sealing effect when the pressure is high. Therefore, a water pump with a multi-seal structure is proposed to solve the above problems. Utility Model Content
[0005] To overcome the above shortcomings, this utility model provides a water pump with a multi-seal structure, which aims to solve the problem that the existing single-stage mechanical seal, which applies force to the sealing material only through a single elastic element, is difficult to meet the sealing requirements when the pressure is high.
[0006] To achieve the above objectives, the present invention adopts the following technical solution: a water pump with a multi-seal structure, including a pump casing, an impeller is provided inside the pump casing, a drive assembly is provided on the rear side of the pump casing, the output end of the drive assembly passes through and is fixedly connected to the rotating shaft of the impeller, and a sealing device is provided together with the output shaft of the drive assembly and the inner wall of the pump casing.
[0007] The sealing device includes a sealing mechanism;
[0008] The sealing mechanism includes a pressure chamber, which is located on the inner wall of the pump housing. An installation chamber is located on the inner wall of the pump housing near the front of the pressure chamber. An elastic plate is fixedly connected to the inner wall of the installation chamber. A sealing block is fixedly connected to the inner wall of the pressure chamber near the output shaft of the drive assembly. A sealing block is fixedly connected to the outer wall of the output shaft of the drive assembly.
[0009] As a further description of the above technical solution:
[0010] The sealing device further includes a second sealing mechanism, which includes a mounting groove. The mounting groove is located on the inner wall of the pump housing, outside the output shaft of the drive assembly and on the right side of the pressure chamber. A stationary plate is fixedly connected to the inner wall of the mounting groove. An mounting plate is fixedly connected to the outer wall of the output shaft of the drive assembly. Rotating plates are fixedly connected to the front and rear sides of the mounting plate. A water-blocking strip is slidably connected to the inner wall of the rotating plate. The side of the water-blocking strip closest to the mounting plate is elastically connected to the inner wall of the rotating plate by a spring.
[0011] As a further description of the above technical solution:
[0012] A separation groove is provided on the side of the water-blocking strip near the stationary plate, and a separation strip is fixedly connected to the side of the stationary plate near the mounting plate.
[0013] As a further description of the above technical solution:
[0014] The drive assembly includes a motor, the output shaft of which passes through the inner wall of the pump casing and is fixedly connected to the impeller shaft.
[0015] As a further description of the above technical solution:
[0016] A support plate is fixedly connected to the lower surface of the motor, and the lower side of the pump casing is fixedly installed on the upper surface of the support plate.
[0017] As a further description of the above technical solution:
[0018] The sealing block one is disposed on the outside of the sealing block two, and the inner circumferential surface of the sealing block one is provided with multiple annular protrusions, the outer circumferential surface of the sealing block two is provided with multiple annular protrusions, and the annular protrusions of the sealing block one are disposed in the gaps between two adjacent annular protrusions of the sealing block two.
[0019] As a further description of the above technical solution:
[0020] The separating strip is annular in shape, and the cross-section of the separating strip is semi-circular.
[0021] As a further description of the above technical solution:
[0022] The air pressure chamber is ring-shaped, and the installation chamber is connected to the air pressure chamber.
[0023] This utility model has the following beneficial effects:
[0024] 1. In this utility model, by setting up an air pressure chamber, an installation chamber, an elastic plate, a sealing block one, and a sealing block two, it is ensured that when the pressure inside the pump casing is high, the deformation degree of the elastic plate increases, thereby increasing the air pressure inside the air pressure chamber. The air pressure replaces the elastic element to squeeze the sealing block one, making it fit better with the sealing block two, thus achieving a sealing effect when the pressure inside the pump casing is high.
[0025] 2. In this utility model, by setting up a stationary plate, mounting plate, rotating plate, water baffle strip, spring, separation strip, etc., the path of liquid flowing out of the pump casing through the gap becomes more tortuous, and when the liquid comes into contact with the curved surface generated by the bending of the water baffle strip, it can generate a backflow force, thereby achieving the effect of preventing liquid leakage. Attached Figure Description
[0026] Figure 1 This is a three-dimensional structural diagram of the overall structure of this utility model;
[0027] Figure 2 This is a three-dimensional cross-sectional view of the overall structure of this utility model;
[0028] Figure 3 In this utility model Figure 2 Enlarged schematic diagram of the three-dimensional structure of part A in the middle;
[0029] Figure 4 In this utility model Figure 3 Enlarged schematic diagram of the three-dimensional structure of part B;
[0030] Figure 5 In this utility model Figure 3 Enlarged schematic diagram of the three-dimensional structure of part C.
[0031] Legend:
[0032] 1. Pump casing; 2. Impeller; 3. Drive assembly; 4. Sealing device; 41. Sealing mechanism one; 42. Sealing mechanism two; 411. Pressure chamber; 412. Mounting chamber; 413. Elastic plate; 414. Sealing block one; 415. Sealing block two; 421. Mounting groove; 422. Stationary plate; 423. Mounting plate; 424. Rotating plate; 425. Water baffle; 426. Spring; 427. Separation bar; 428. Separation groove; 5. Support plate; 31. Motor. Detailed Implementation
[0033] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0034] Reference Figure 1 - Figure 3 This utility model provides an embodiment of a water pump with a multi-seal structure, including a pump casing 1. An impeller 2 is disposed inside the pump casing 1. By rotating the impeller 2, water or other liquids from the outside are drawn into the pump casing 1. A drive assembly 3 is disposed on the rear side of the pump casing 1. The drive assembly 3 is used to provide rotational power for the impeller 2. The output end of the drive assembly 3 passes through and is fixedly connected to the rotating shaft of the impeller 2. A sealing device 4 is disposed together with the output shaft of the drive assembly 3 and the inner wall of the pump casing 1. The sealing device 4 is used to seal the holes opened in the inner wall of the pump casing 1. The drive assembly 3 includes a motor 31. The output shaft of the motor 31 passes through the inner wall of the pump casing 1 and is fixedly connected to the rotating shaft of the impeller 2. A support plate 5 is fixedly connected to the lower surface of the motor 31. The lower side of the pump casing 1 is fixedly mounted on the upper surface of the support plate 5. The setting of the support plate 5 ensures that the motor 31 and the pump casing 1 are relatively fixed.
[0035] Reference Figure 2 - Figure 4 The sealing device 4 includes a sealing mechanism 41, which includes a pressure chamber 411. The pressure chamber 411 is located on the inner wall of the pump housing 1 and is annular in shape. An installation chamber 412 is provided on the inner wall of the pump housing 1 near the front of the pressure chamber 411. The installation chamber 412 communicates with the pressure chamber 411. An elastic plate 413 is fixedly connected to the inner wall of the installation chamber 412. When one side of the elastic plate 413 is compressed, it can bend to the other side. A sealing block 414 is fixedly connected to the inner wall of the pressure chamber 411 near the output shaft of the drive assembly 3. A second sealing block 415 is fixedly connected to the outer wall of the output shaft of the drive assembly 3. A first sealing block 414 is located on the outside of the second sealing block 415, and the inner circumferential surface of the first sealing block 414 is provided with multiple annular protrusions. The outer circumferential surface of the second sealing block 415 is provided with multiple annular protrusions. The annular protrusions of the first sealing block 414 are located in the gap between two adjacent annular protrusions of the second sealing block 415. Through the shape setting of the first sealing block 414 and the second sealing block 415, it is ensured that water or other liquids cannot easily pass through the gap between the first sealing block 414 and the second sealing block 415.
[0036] Reference Figure 2 , Figure 3 and Figure 5The sealing device 4 also includes a second sealing mechanism 42, which includes a mounting groove 421. The mounting groove 421 is located on the inner wall of the pump housing 1, outside the output shaft of the drive assembly 3 and on the right side of the pressure chamber 411. A stationary plate 422 is fixedly connected to the inner wall of the mounting groove 421. The stationary plate 422 does not rotate with the output shaft of the drive assembly 3. A mounting plate 423 is fixedly connected to the outer wall of the output shaft of the drive assembly 3. The mounting plate 423 is annular in shape. Rotating plates 424 are fixedly connected to the front and rear sides of the mounting plate 423. The outer diameter of the rotating plate 424 is smaller than the outer diameter of the mounting plate 423. A water-blocking strip 425 is slidably connected to the inner wall of the rotating plate 424. The water-blocking strip 425 is close to the stationary plate 421. A separation groove 428 is provided on one side of the stop plate 422. The separation groove 428 is used to divide the side of the water-blocking strip 425 near the stationary plate 422 into two parts. A separation strip 427 is fixedly connected to the side of the stationary plate 422 near the mounting plate 423. The separation strip 427 is annular in shape and has a semi-circular cross-section. By setting the separation strip 427, it is ensured that the areas of the water-blocking strip 425 on both sides of the separation groove 428 can move away from the middle of the water-blocking strip 425, thereby ensuring that the water-blocking strip 425 can deform according to the required shape. The side of the water-blocking strip 425 near the mounting plate 423 is elastically connected to the inner wall of the rotating plate 424 by a spring 426.
[0037] Working principle: During use, when the internal pressure of the pump casing 1 is high, it is more difficult for the liquid to enter the gap between the output shaft of the motor 31 and the inner wall of the pump casing 1 than to squeeze the elastic plate 413. Therefore, the elastic plate 413 is more likely to generate a backward squeezing force under pressure. After the elastic plate 413 deforms, it occupies the internal space of the air pressure chamber 411, thus increasing the internal air pressure of the air pressure chamber 411. As a result, the sealing block 414 generates a force that moves towards the sealing block 415 under the pressure of the air pressure, thereby achieving the effect of squeezing the sealing block 414 by the gas pressure instead of the elastic element. Since the pressure exerted on the sealing block 414 by the air pressure is proportional to the internal pressure of the pump casing 1, the relative pressure between the sealing block 414 and the sealing block 415 will also increase when the internal pressure of the pump casing 1 increases. Therefore, it is ensured that the liquid is not prone to leakage due to the high internal pressure of the pump casing 1.
[0038] Meanwhile, because the end of the water-blocking strip 425 near the stationary plate 422 is in contact with the separation strip 427, and the separation groove 428 is provided on this side, the two sides of the water-blocking strip 425 can be dispersed on both sides of the separation strip 427, so that the end is blocked and an arc surface appears on the side away from the separation strip 427. Therefore, when the water comes into contact with the arc surface, it can generate a backflow force due to the action of the curved surface, so that the outward flowing water loses the outward flow force, thus making it difficult for the liquid to leak out.
[0039] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.
Claims
1. A water pump with a multi-seal structure, comprising a pump casing (1), characterized in that: An impeller (2) is provided inside the pump casing (1), and a drive assembly (3) is provided on the rear side of the pump casing (1). The output end of the drive assembly (3) passes through and is fixedly connected to the rotating shaft of the impeller (2). A sealing device (4) is provided together with the output shaft of the drive assembly (3) and the inner wall of the pump casing (1). The sealing device (4) includes a sealing mechanism (41); The sealing mechanism 1 (41) includes a pressure chamber (411), which is located on the inner wall of the pump housing (1). An installation chamber (412) is provided on the inner wall of the pump housing (1) near the front side of the pressure chamber (411). An elastic plate (413) is fixedly connected to the inner wall of the installation chamber (412). A sealing block 1 (414) is fixedly connected to the inner wall of the pressure chamber (411) near the output shaft of the drive assembly (3). A sealing block 2 (415) is fixedly connected to the outer wall of the output shaft of the drive assembly (3).
2. A water pump with a multi-seal structure according to claim 1, characterized in that: The sealing device (4) further includes a second sealing mechanism (42), which includes a mounting groove (421). The mounting groove (421) is located on the inner wall of the pump housing (1) on the outside of the output shaft of the drive assembly (3) and on the right side of the pressure chamber (411). A stationary plate (422) is fixedly connected to the inner wall of the mounting groove (421). A mounting plate (423) is fixedly connected to the outer wall of the output shaft of the drive assembly (3). A rotating plate (424) is fixedly connected to the front and rear sides of the mounting plate (423). A water baffle (425) is slidably connected to the inner wall of the rotating plate (424). The side of the water baffle (425) closest to the mounting plate (423) is elastically connected to the inner wall of the rotating plate (424) by a spring (426).
3. A water pump with a multi-seal structure according to claim 2, characterized in that: The water-blocking strip (425) has a separation groove (428) on the side near the stationary plate (422), and the stationary plate (422) has a separation strip (427) fixedly connected to the side near the mounting plate (423).
4. A water pump with a multiple sealing structure according to claim 1, characterized in that: The drive assembly (3) includes a motor (31), the output shaft of which passes through the inner wall of the pump casing (1) and is fixedly connected to the shaft of the impeller (2).
5. A water pump with a multi-seal structure according to claim 4, characterized in that: A support plate (5) is fixedly connected to the lower surface of the motor (31), and the lower side of the pump casing (1) is fixedly installed on the upper surface of the support plate (5).
6. A water pump with a multi-seal structure according to claim 1, characterized in that: The sealing block one (414) is disposed on the outside of the sealing block two (415), and the inner circumferential surface of the sealing block one (414) is provided with a plurality of annular protrusions, the outer circumferential surface of the sealing block two (415) is provided with a plurality of annular protrusions, and the annular protrusions of the sealing block one (414) are disposed in the gap between two adjacent annular protrusions of the sealing block two (415).
7. A water pump with a multi-seal structure according to claim 3, characterized in that: The separation strip (427) is annular in shape, and the cross-sectional shape of the separation strip (427) is semi-circular.
8. A water pump with a multiple sealing structure according to claim 1, characterized in that: The air pressure chamber (411) is annular in shape, and the installation chamber (412) is connected to the air pressure chamber (411).