Water seal structure and water pump
By adopting a double spring structure of inner and outer rings in the water pump, the rapid response and good fit of the dynamic ring and the static ring at different rotation speeds is achieved, which solves the problem of unstable sealing performance of the water pump and improves the sealing performance and operating reliability.
Patent Information
- Application Number
- CN202421442723.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-21
- Publication Date
- 2025-03-18
- Estimated Expiration
- 2034-06-21
AI Technical Summary
When the pump speed changes in the existing water pump sealing structure, the spring return speed cannot keep up with the change in the speed, resulting in poor follow-up of the static ring, degradation of the sealing performance, and even water leakage problems.
The inner and outer ring double spring structure is adopted, the first spring and the static ring base have preload force, and the second spring is in a free state in the initial state. Through the cooperation of the double springs, the rapid response and good fit between the static ring and the static ring at different rotation speeds are achieved.
Within a wide speed range, the moving ring and the static ring have a good fit, which solves the problem of water seal leakage when the pump speed fluctuates, and improves the sealing performance and operating reliability of the water pump.
Smart Images
Figure CN222633493U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of water pump sealing, in particular to a water seal structure and a water pump. Background Art
[0002] As a common fluid machinery, water pumps are widely used in agricultural irrigation, industrial production, urban water supply and other fields. During the operation of the water pump, the effective sealing of the dynamic ring and the static ring is the key to ensure its normal operation. The sealing performance of the dynamic ring and the static ring directly affects the efficiency and service life of the water pump.
[0003] The existing water pump sealing structure includes a dynamic ring, a static ring and a spring, among which the dynamic ring rotates with the central axis of the water pump, while the static ring does not rotate with the central axis. The dynamic ring and the static ring are usually supported by a single spring to achieve a close fit between the dynamic ring and the static ring. However, when the speed of the water pump changes, the return speed of the spring cannot keep up with the change in speed, making the static ring poor in tracking, resulting in a decrease in sealing performance and even water leakage. Utility Model Content
[0004] In view of the deficiencies in the prior art, the purpose of the embodiments of the utility model is to provide a water seal structure and a water pump to solve the problem that when the speed of the water pump fluctuates, the spring of the single spring support structure has a slow response speed and cannot adjust the fitting force between the dynamic ring and the static ring in time, resulting in unstable sealing performance.
[0005] In order to achieve the above purpose, the embodiment of the utility model provides the following technical solutions:
[0006] A water seal structure comprises a rotating part and a stationary part; the rotating part comprises a transmission seat and a moving ring, and the moving ring is sleeved on the transmission seat; the stationary part comprises a base, a stationary ring and a spring group, and the stationary ring is sleeved on the base, the stationary ring has a first end and a second end along the axial direction, and a set space is provided between the first end of the stationary ring and the bottom end of the base, the spring group is installed in the set space to press the second end of the stationary ring against the moving ring, and the spring group comprises a first spring and a second spring nested in each other, and in an initial state, the first spring is subjected to a predetermined pressure, and the second spring is in a free state.
[0007] Optionally, the initial state length of the first spring is greater than the initial state length of the second spring. When the second end of the static ring abuts against the dynamic ring, the axial length of the set space between the first end of the static ring and the base is less than the initial length of the first spring and less than the initial length of the second spring.
[0008] Optionally, the inner diameter of the first spring is larger than the outer diameter of the second spring, and the first spring is sleeved on the radially outer side of the second spring; or, the inner diameter of the second spring is larger than the outer diameter of the first spring, and the second spring is sleeved on the radially outer side of the first spring.
[0009] Optionally, the wire diameter of the first spring is smaller than the wire diameter of the second spring, wherein the wire diameter refers to the diameter of the helical spring body.
[0010] Optionally, the stationary part further comprises a gasket, which is annular and sleeved on the base and located between the spring assembly and the stationary ring. Both the first spring and the second spring can press against the gasket to generate elastic force on the stationary ring.
[0011] Optionally, the transmission seat and the base are both double-layer structures, the inner ring structure of the base is sleeved on the inner ring structure of the transmission seat, the static ring and the spring group are nested on the inner ring structure of the base, and the dynamic ring is installed on the inner ring structure of the transmission seat.
[0012] Optionally, the inner ring structure of the stationary ring and the base is a clearance fit, and the inner ring structure of the dynamic ring and the transmission seat is an interference fit.
[0013] Optionally, the inner ring of the first end of the moving ring has an annular inner platform, and the annular inner platform and the inner ring structure of the gasket and the base form a first sealed space, and a first sealing ring is installed in the first sealed space.
[0014] Optionally, an outer ring of the moving ring away from one end of the stationary ring is provided with an annular outer platform, and the annular outer platform and the end surface of the transmission seat and the outer ring structure enclose a second sealed space, and a second sealing ring is installed in the second sealed space.
[0015] The embodiment of the utility model further provides a water pump, comprising the water seal structure as described above.
[0016] One or more technical solutions provided in the embodiments of the present utility model have at least the following technical effects or advantages:
[0017] The spring group in the static ring base is an inner and outer double spring, and the first spring and the static ring base have a pre-tightening force, while the second spring is initially in a free state. The pressure borne by the dynamic ring is different under different water pump speeds, and the double spring intervention force is different for different dynamic ring input forces. The rapid expansion and contraction of the spring makes the dynamic ring and the static ring have good followability, ensuring that the dynamic ring and the static ring have a good fit within a wider speed range of the water pump, solving the problem of water seal leakage caused by the untimely return of the spring in the static ring base when the water pump speed fluctuates, and improving the sealing performance and operation reliability of the water pump.
[0018] Additional advantages of the present invention will be given in the following description, and some will become apparent from the following description or will be understood through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] The drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention.
[0020] Figure 1 It is a cross-sectional view of a water seal structure provided by an embodiment of the utility model;
[0021] Figure 2 This is an outline diagram of a water seal structure provided by an embodiment of the utility model;
[0022] In the figure: 1, base; 2, gasket; 3, static ring; 4, transmission seat; 5, dynamic ring; 6, second sealing ring; 7, first sealing ring; 8, first spring; 9, second spring;
[0023] In order to show the positions of various parts, the distances or sizes between them are exaggerated and the schematic diagram is for reference only. DETAILED DESCRIPTION
[0024] It should be noted that the following detailed descriptions are illustrative and are intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meanings as those commonly understood by those of ordinary skill in the art to which the present invention belongs. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.
[0025] Terminology explanation:
[0026] Rotating ring: A component that rotates with the central axis of the water pump, generally made of silicon carbide.
[0027] Static ring: does not rotate with the central axis, fits tightly with the dynamic ring axially, and is generally made of silicon carbide.
[0028] In order to solve the technical problems mentioned in the background technology, this embodiment proposes a water seal structure to improve the sealing performance of the water pump at different speeds, solve the problem of unstable sealing performance of the water pump sealing structure when the speed changes, and achieve fast response and good fit between the dynamic ring and the static ring at different speeds through the double spring structure of the inner and outer rings, thereby improving the sealing performance and operating reliability of the water pump. At the same time, the sealing structure is simplified, the manufacturing cost is reduced, and the overall performance of the water pump is improved.
[0029] like Figure 1 , Figure 2As shown, the water seal structure includes a rotating part and a stationary part:
[0030] The rotating part comprises a transmission seat 4 and a moving ring 5 , and the moving ring 5 is sleeved on the transmission seat 4 .
[0031] The stationary part includes a base 1, a stationary ring 3 and a spring group. The stationary ring 3 is sleeved on the base 1 and has a first end (i.e. Figure 1 The lower middle end) and the second end (i.e. Figure 1 The first end of the stationary ring 3 and the bottom end of the base 1 have a set space between them. The spring group is installed in the set space to press the second end of the stationary ring 3 against the dynamic ring 5. The spring group includes a first spring 8 and a second spring 9 nested in each other. In the initial state, the first spring 8 is subjected to a predetermined pressure, and the second spring 9 is in a free state and is not subjected to pressure. The terms "first", "second", etc. are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features.
[0032] At low speed, the input pressure of the dynamic ring 5 is small, the first spring 8 and the base 1 of the static ring 3 have pre-pressure, and the first spring 8 is in a compressed state, ensuring that the dynamic ring 5 and the static ring 3 have a certain fit. In this working condition, the second spring 9 is in a free state. When the speed of the water pump increases rapidly, the input pressure of the dynamic ring 5 increases, the compression of the first spring 8 exceeds the predetermined range, and the second spring 9 is compressed. At this time, the two springs are connected in parallel to provide spring force. When the speed of the water pump is reduced to a certain range, the compression of the two springs is reduced. By connecting the two springs in parallel, the number of internal and external springs involved at different water pump speeds is different, and the compression is different. When the dynamic ring 5 is subjected to force changes, the spring expands and contracts rapidly, and the spring force changes in time, ensuring that the dynamic ring 5 and the static ring 3 have good followability, and improving the acceleration of the water pump speed change that the water pump water seal can withstand.
[0033] like Figure 1 As shown, the initial state length of the first spring 8 is greater than the initial state length of the second spring 9. When the second end of the stationary ring 3 abuts against the dynamic ring 5, the axial length of the set space between the first end of the stationary ring 3 and the base 1 is less than the initial length of the first spring 8 and less than the initial length of the second spring 9. This design ensures that at different speeds, whether the elastic force of the second spring 9 is involved, the compression amount and the return speed can be quickly adjusted through the cooperation of the two parallel springs, avoiding the water seal leakage problem caused by the change of the water pump speed.
[0034] There are two ways to nest the first spring 8 and the second spring 9, one of which is as follows: Figure 1As shown, the inner diameter of the first spring 8 is larger than the outer diameter of the second spring 9, that is, the first spring 8 is sleeved on the radial outside of the second spring 9. In another embodiment, the inner diameter of the second spring 9 is larger than the outer diameter of the first spring 8, that is, the second spring 9 is sleeved on the radial outside of the first spring 8. This design provides flexibility, and the most suitable spring combination can be selected according to specific design requirements and working conditions of the water pump. The double springs can provide different spring forces under different pressure conditions through the mutually nested design. Under the action of the axial thrust of the spring, the static ring 3 makes the dynamic ring 5 fit tightly with the static ring 3, ensuring the sealing effect of the water pump in a wide speed range. Although the dynamic ring 5 and the transmission seat 4 rotate at high speed around the central axis during operation, they are still tightly fitted in the axial direction to achieve a stable water sealing effect.
[0035] The wire diameter of the first spring 8 is smaller than that of the second spring 9. The wire diameter refers to the diameter of the spiral spring body. This means that the second spring 9 can provide a greater elastic force under the same compression amount. By selecting springs with different wire diameters, the spring elastic force and stiffness can be precisely controlled, thereby providing a suitable spring force when the speed of the water pump changes, ensuring a tight fit between the dynamic ring 5 and the static ring 3.
[0036] like Figure 1 As shown, the stationary part also includes a gasket 2, which is annular and sleeved on the base 1, and is located between the spring group and the stationary ring 3. The gasket 2 and the base 1 constitute the spring upper seat and the spring lower seat respectively. The first spring 8 and the second spring 9 can both rest on the gasket 2 to generate elastic force on the stationary ring 3. This design ensures that the spring group is evenly stressed during compression and return, improves the transmission efficiency of the spring force, and reduces the wear that may be caused by direct contact between the spring and the stationary ring 3.
[0037] The transmission seat 4 and the base 1 are both double-layer structures, the inner ring structure of the base 1 is sleeved on the inner ring structure of the transmission seat 4, the static ring 3 and the spring group are both nested on the inner ring structure of the base 1, and the dynamic ring 5 is installed on the inner ring structure of the transmission seat 4. This double-layer structure design can improve the stability of the overall structure. Among them, the static ring 3 and the inner ring structure of the base 1 are clearance fit, and the dynamic ring 5 and the inner ring structure of the transmission seat 4 are interference fit.
[0038] The stationary ring 3 and the inner ring of the base 1 are radially positioned by gap assembly, and there is no need to use a seat sleeve for radial positioning. The stationary ring 3 is axially limited by the circular ring gasket 2 and the dynamic ring 5. The dynamic ring 5 and the transmission seat 4 are interference fit to achieve radial positioning of the dynamic ring 5, ensure the stability of the dynamic ring 5 when rotating at high speed, and the structure is compact and simple.
[0039] The inner ring of the first end of the moving ring 5 has an annular inner platform, which, together with the gasket 2 and the inner ring structure of the base 1, encloses a first sealed space, in which a first sealing ring 7 is installed. The outer ring of the moving ring 5 at the end away from the stationary ring 3 is provided with an annular outer platform, which, together with the end surface of the transmission seat 4 and the outer ring structure, encloses a second sealed space, in which a second sealing ring 6 is installed.
[0040] The moving ring 5 and the stationary ring 3 are both made of silicon carbide material. The cross section of the moving ring 5 is an L-shaped ring, so that an O-ring seal (i.e., the second sealing ring 6) can be used between the moving ring 5 and the transmission seat 4. The gasket 2 is annular, and a rectangular space (i.e., the first sealing space) is formed between the gasket 2, the base 1, and the stationary ring 3. The O-ring seal is used in the rectangular space. The seal between the moving ring 5 and the transmission seat 4 is sealed with an O-ring. Compared with the traditional method of vulcanizing rubber on the transmission seat 4, the process is simpler and the seal is more reliable.
[0041] Based on the above water seal structure, the embodiment of the utility model further provides a water pump, in which the water seal structure described in the above embodiment is arranged. By adopting the water seal structure designed as above, the water pump can maintain good sealing performance at different speeds, effectively avoiding the water seal leakage problem caused by speed fluctuation, thereby improving the overall performance of the water pump and reducing energy consumption loss and potential environmental pollution problems caused by poor sealing.
[0042] Although the above describes the specific implementation methods of the utility model in combination with the accompanying drawings, it is not intended to limit the scope of protection of the utility model. Technical personnel in the relevant field should understand that on the basis of the technical solution of the utility model, various modifications or deformations that can be made by technical personnel in this field without creative work are still within the scope of protection of the utility model.
Claims
1. A water seal structure, characterized in that: It includes a rotating part and a stationary part; The rotating part comprises a transmission seat and a moving ring, and the moving ring is sleeved on the transmission seat; The stationary part includes a base, a stationary ring and a spring group. The stationary ring is sleeved on the base. The stationary ring has a first end and a second end in the axial direction. A set space is provided between the first end of the stationary ring and the bottom end of the base. The spring group is installed in the set space to press the second end of the stationary ring against the moving ring. The spring group includes a first spring and a second spring that are nested in each other. In an initial state, the first spring is subjected to a predetermined pressure, and the second spring is in a free state.
2. The water seal structure according to claim 1, characterized in that: The initial state length of the first spring is greater than the initial state length of the second spring. When the second end of the static ring abuts against the dynamic ring, the axial length of the set space between the first end of the static ring and the base is less than the initial length of the first spring and less than the initial length of the second spring.
3. The water seal structure according to claim 1, characterized in that: The inner diameter of the first spring is larger than the outer diameter of the second spring, and the first spring is sleeved on the radially outer side of the second spring; or, the inner diameter of the second spring is larger than the outer diameter of the first spring, and the second spring is sleeved on the radially outer side of the first spring.
4. The water seal structure according to claim 1, characterized in that: The wire diameter of the first spring is smaller than the wire diameter of the second spring, wherein the wire diameter refers to the diameter of the helical spring body.
5. The water seal structure according to claim 1, characterized in that: The stationary part also includes a gasket, which is annular and sleeved on the base and located between the spring group and the stationary ring. The first spring and the second spring can both press against the gasket to generate elastic force on the stationary ring.
6. The water seal structure according to claim 5, characterized in that: The transmission seat and the base are both double-layer structures, the inner ring structure of the base is sleeved on the inner ring structure of the transmission seat, the static ring and the spring group are nested on the inner ring structure of the base, and the dynamic ring is installed on the inner ring structure of the transmission seat.
7. The water seal structure according to claim 6, characterized in that: The inner ring structure of the stationary ring and the base is a clearance fit, and the inner ring structure of the dynamic ring and the transmission seat is an interference fit.
8. The water seal structure according to claim 6, characterized in that: The inner ring of the first end of the moving ring has an annular inner platform, and the annular inner platform, the gasket, and the inner ring structure of the base form a first sealed space, and a first sealing ring is installed in the first sealed space.
9. The water seal structure according to claim 6, characterized in that: An annular outer platform is arranged on the outer ring of the moving ring away from one end of the stationary ring. The annular outer platform, the end surface of the transmission seat and the outer ring structure form a second sealed space. A second sealing ring is installed in the second sealed space.
10. A water pump, characterized in that: It comprises a water seal structure as described in any one of claims 1 to 9.