A dual seal redundant design automotive water pump

Abstract

The utility model relates to the technical field of automobile water pump discloses a double -sealed redundancy design automobile water pump, including water pump casing, the both ends of water pump casing are provided with the double -sealed structure for improving the leakproofness respectively in one side, and the double -sealed structure includes metal bellows, metal bellows is screwed on the inner chamber of joint, the inner chamber fixed connection of metal bellows upper end has micro -hydraulic cylinder, the upper end fixed connection of micro -hydraulic cylinder has disc spring, and disc spring fixed connection is in the upper end of metal bellows, the upper end fixed connection of disc spring has elastic sealing ring, and elastic sealing ring is set up in the outside of metal bellows and micro -hydraulic cylinder and disc spring, the metal bellows of double -sealed structure is also adaptable to small displacement of corrosion -resistant wear -resistant, and micro -hydraulic cylinder is matched with sensor and can give early warning to seal abnormality, disc spring compensates wear and pressure stability, elastic sealing ring is corrosion -resistant and the liquid -conducting groove of flow guide is liquid -conducting and stress -relaxing, and each component cooperatively realizes redundancy seal.

Description

Technical Field

[0001] This utility model relates to the field of automotive water pump technology, specifically to an automotive water pump with a double-seal redundant design. Background Technology

[0002] Inside the engine block of a car, there are multiple water channels for cooling water circulation. These channels are connected to the radiator located at the front of the car via water pipes, forming a large water circulation system. A water pump is installed at the upper outlet of the engine, driven by a fan belt, to pump hot water out of the engine block's water channels and pump in cold water. Next to the water pump is a thermostat. When the car is first started, it does not open, allowing the coolant to circulate only within the engine and not through the radiator. Once the engine temperature reaches above 95 degrees Celsius, it opens, pumping the hot water from the engine into the radiator. The cool air from the car as it moves forward blows across the radiator, carrying away the heat.

[0003] However, traditional automotive water pumps often suffer from problems such as simple sealing structure design and insufficient durability of sealing components, making them difficult to adapt to the complex operating conditions of a vehicle. Vibrations during vehicle operation and temperature fluctuations generated by engine operation can easily lead to loosening of the sealing surface, wear or aging of sealing components, and consequently, coolant leakage. Coolant leakage not only reduces engine cooling efficiency and affects normal engine operation, but may also cause engine overheating and damage due to insufficient coolant. Furthermore, leaking coolant can corrode surrounding components of the water pump, shortening the overall lifespan of the vehicle. Therefore, those skilled in the art provide a dual-seal redundant design automotive water pump to solve the problems mentioned in the background art. Utility Model Content

[0004] The purpose of this invention is to provide a dual-seal redundant design automotive water pump to solve the problems in the prior art.

[0005] This utility model provides the following technical solution: a double-seal redundant design car water pump, including a water pump housing, with double-seal structures for improving sealing at both ends of the water pump housing on one side, a bracket for fixing the water pump fixedly connected to one side of the water pump housing, a power component for providing power to the water pump fixedly connected to the upper side of the center of the water pump housing, a connector for connection fixedly connected between the water pump housing and the double-seal structure, and the inner cavity of the connector is threaded, the double-seal structure includes a metal bellows, the metal bellows is threaded to the inner cavity of the connector, a miniature hydraulic cylinder is fixedly connected to the inner cavity of the upper end of the metal bellows, a disc spring is fixedly connected to the upper end of the miniature hydraulic cylinder, and the disc spring is fixedly connected to the upper end of the metal bellows, an elastic sealing ring is fixedly connected to the upper end of the disc spring, and the elastic sealing ring is sleeved on the outer surface of the connector (5).

[0006] As a preferred embodiment of the above technical solution, the metal corrugated pipe is made of 316L stainless steel, with a wall thickness of 0.3mm-0.5mm, and the outer surface of the metal corrugated pipe is coated with an alumina ceramic coating of 0.1mm-0.2mm thickness.

[0007] As a preferred embodiment of the above technical solution, the inner cavity of the micro hydraulic cylinder is filled with inert hydraulic oil compatible with automotive water pump coolant, and a micro pressure sensor is installed on the side wall of the micro hydraulic cylinder. The detection range of the micro pressure sensor is 0.1MPa-2.0MPa, and the accuracy is ±0.02MPa.

[0008] As a preferred embodiment of the above technical solution, the number of disc springs is 2-3 pieces, and the multiple disc springs are arranged in a paired combination. The disc springs are made of 50CrVA spring steel, the working stroke of the disc springs is 1.5mm-3mm, and the rated spring force is 50N-80N.

[0009] As a preferred embodiment of the above technical solution, the elastic sealing ring is made of a composite modified material of fluororubber and nano-silica, and the inner wall of the elastic sealing ring is provided with an annular guide groove. The cross-section of the annular guide groove is an isosceles trapezoid with a groove width of 0.8mm-1.2mm and a groove depth of 0.5mm-0.7mm.

[0010] As a preferred embodiment of the above technical solution, the power assembly includes a drive motor and a transmission shaft. One end of the transmission shaft is rigidly connected to the output shaft of the drive motor via a coupling, and the other end extends into the interior of the car water pump and is fixedly connected to the impeller. The external thread of the connector and the internal thread of the connection hole of the car water pump have a matching accuracy of 6H / 6g. Furthermore, a nitrile rubber sealing gasket is fitted at the connection between the connector and the car water pump, and the thickness of the nitrile rubber sealing gasket is 1.5mm-2mm.

[0011] Compared with the prior art, the beneficial effects of this utility model are: This invention features a double-sealing structure. The metal bellows is made of 316L stainless steel and coated with an alumina ceramic layer, providing excellent corrosion resistance, wear resistance, and high-temperature resistance. It can withstand the harsh environment inside the water pump and adapt to minor displacements caused by vibration and temperature changes, providing reliable structural support for the seal. The miniature hydraulic cylinder is filled with inert hydraulic oil compatible with the coolant and is equipped with a high-precision miniature pressure sensor, which can monitor changes in sealing pressure in real time, provide timely warnings of sealing abnormalities, and achieve proactive monitoring and troubleshooting of the sealing status. Two to three paired 50CrVA spring steel disc springs provide continuous and stable rated elastic force, while compensating for displacement and loss caused by vibration and wear through their own elastic deformation, ensuring stable sealing pressure. The elastic sealing ring, modified with fluororubber and nano-silica, has excellent oil and chemical corrosion resistance and elastic recovery ability. The inner annular guide groove can also guide a small amount of leaked coolant and alleviate thermal expansion and contraction stress, further enhancing the sealing effect. Attached Figure Description

[0012] Figure 1 A schematic diagram of the overall structure of a dual-seal redundant design automotive water pump; Figure 2 A disassembly diagram of the dual-seal structure of a dual-seal redundant design automotive water pump; Figure 3 This is a schematic cross-sectional view of the overall structure of a dual-seal redundant design automotive water pump.

[0013] In the diagram: 1. Pump housing; 2. Double-seal structure; 21. Metal bellows; 22. Miniature hydraulic cylinder; 23. Disc spring; 24. Elastic sealing ring; 3. Bracket; 4. Power assembly; 5. Connector. Detailed Implementation

[0014] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0015] Please see Figures 1-3As shown, this utility model provides a technical solution: a double-sealed redundant design automotive water pump, including a water pump housing 1. Double-sealed structures 2 for improving sealing are respectively provided on one side of both ends of the water pump housing 1. A bracket 3 for fixing the water pump is fixedly connected to one side of the water pump housing 1. A power component 4 for providing power to the water pump is fixedly connected to the upper side of the center of the water pump housing 1. A connector 5 for connection is fixedly connected between the water pump housing 1 and the double-sealed structure 2, and the inner cavity of the connector 5 is threaded. The double-sealed structure 2 includes a metal bellows 21, which is threadedly connected to the inner cavity of the connector 5. A miniature hydraulic cylinder 22 is fixedly connected to the inner cavity of the upper end of the metal bellows 21. A disc spring 23 is fixedly connected to the upper end of the miniature hydraulic cylinder 22, and the disc spring 23 is fixedly connected to the upper end of the metal bellows 21. An elastic sealing ring 24 is fixedly connected to the upper end of the disc spring 23, and the elastic sealing ring 24 is sleeved on the outer surface of the connector 5.

[0016] The power assembly 4 located on the upper center of the pump housing 1 provides operating power, ensuring the core functions of pumping water and delivering coolant. The bracket 3 on one side of the pump housing 1 serves to fix the pump and maintain the overall structural stability, preventing vibration and displacement during pump operation from affecting the sealing and power transmission effects. The double-seal structure 2 on one side of both ends of the pump housing 1 is key to achieving high sealing performance. It is connected to the pump housing 1 through a connector 5, and the threaded design of the inner cavity of the connector 5 provides a stable installation base for the metal bellows 21. The metal bellows 21 is threaded into the inner cavity of the connector 5, laying the structural support for the subsequent assembly and sealing of the sealing components. The miniature hydraulic cylinder 22, fixed in the inner cavity of the upper end of the metal bellows 21, can monitor the sealing status in real time through the inert hydraulic oil compatible with coolant inside the cavity and the miniature pressure sensor on the side wall, and promptly capture pressure changes to warn of sealing abnormalities. The disc spring 23, fixed in the upper end of the miniature hydraulic cylinder 22, provides stable pressure to the elastic sealing ring 24 above by means of its own elastic deformation capability, ensuring that the elastic sealing ring 24 fits tightly against the sealing surface and can compensate for displacement and loss caused by vibration and wear. The elastic sealing ring 24 is sleeved on the outside of the metal bellows 21, the miniature hydraulic cylinder 22 and the disc spring 23, and directly contacts the sealing surface to form a core sealing barrier. Its material properties and the inner annular guide groove design further enhance the sealing performance and delay loss. Finally, through the synergistic effect of the components of the double sealing structure 2, combined with the sealing design at the joint 5, the overall high-efficiency sealing of the water pump is achieved.

[0017] As one implementation method in this embodiment, please refer to Figures 1-3 As shown, the metal corrugated pipe 21 is made of 316L stainless steel, with a wall thickness of 0.3mm-0.5mm, and the outer surface of the metal corrugated pipe 21 is coated with an alumina ceramic coating of 0.1mm-0.2mm thickness.

[0018] The 316L stainless steel material possesses corrosion resistance and mechanical strength. The 0.3mm-0.5mm wall thickness ensures structural stability while providing a certain degree of elastic deformation, accommodating the minute displacements of the water pump caused by vibration and temperature changes during vehicle operation, thus avoiding seal failure issues due to rigid connections. The 0.1mm-0.2mm thick alumina ceramic coating on the outer surface further enhances the wear resistance of the metal bellows 21, preventing surface damage caused by friction during long-term use. It also improves its high-temperature resistance and chemical corrosion resistance, resisting the erosion of various chemicals in the automotive coolant, extending the service life of the metal bellows 21, and thus ensuring the basic sealing performance of the double-seal structure 2.

[0019] As one implementation method in this embodiment, please refer to Figures 1-3 As shown, the inner cavity of the miniature hydraulic cylinder 22 is filled with inert hydraulic oil compatible with automotive water pump coolant, and a miniature pressure sensor is installed on the side wall of the miniature hydraulic cylinder 22. The detection range of the miniature pressure sensor is 0.1MPa-2.0MPa, and the accuracy is ±0.02MPa.

[0020] The inner cavity of the miniature hydraulic cylinder 22 is filled with inert hydraulic oil compatible with the automotive water pump coolant. This inertness ensures that the hydraulic oil will not chemically react with the coolant, preventing impurities from affecting the normal operation of the water pump and also preventing the hydraulic oil itself from deteriorating and causing cylinder malfunction. When the water pump is operating, if a minor leak occurs in the double-seal structure 2, the coolant pressure change will be transmitted to the miniature hydraulic cylinder 22, causing a corresponding change in the pressure of the inert hydraulic oil within the cavity. At this time, a miniature pressure sensor mounted on the side wall can accurately capture this pressure change and transmit the signal to the vehicle's control system. Operators or the system can use this pressure signal to determine the sealing status; if the pressure exceeds the normal range, a potential problem with the sealing structure can be identified promptly.

[0021] As one implementation method in this embodiment, please refer to Figures 1-3 As shown, there are 2-3 disc springs 23, and the multiple disc springs 23 are arranged in a paired combination. The material of the disc springs 23 is 50CrVA spring steel. The working stroke of the disc springs 23 is 1.5mm-3mm, and the rated spring force is 50N-80N.

[0022] The system employs 2-3 disc springs 23 made of 50CrVA spring steel. This material possesses a high elastic limit, good fatigue strength, and impact resistance, maintaining stable elastic performance under long-term repeated stress. The multiple disc springs 23 are arranged in a paired configuration. This arrangement effectively enhances the spring's load-bearing capacity and deformation, allowing its working stroke to reach 1.5mm-3mm and its rated spring force to remain between 50N and 80N. This provides continuous and stable pressure to the elastic sealing ring 24, ensuring a tight fit between the ring and the sealing surface and enhancing the sealing effect. Furthermore, when the pump vibrates or the sealing surface experiences minor wear, the springs compensate for displacement and wear through their elastic deformation, maintaining stable sealing pressure and preventing leakage due to insufficient sealing.

[0023] As one implementation method in this embodiment, please refer to Figures 1-3 As shown, the elastic sealing ring 24 is made of a composite modified material of fluororubber and nano silica, and the inner wall of the elastic sealing ring 24 is provided with an annular guide groove. The cross-section of the annular guide groove is an isosceles trapezoid with a groove width of 0.8mm-1.2mm and a groove depth of 0.5mm-0.7mm.

[0024] The elastic sealing ring 24 is made of a composite modified material of fluororubber and nano-silica. Fluororubber itself has excellent high temperature resistance, oil resistance, and chemical corrosion resistance, and can adapt to the harsh working environment inside the automotive water pump. The addition of nano-silica can significantly improve the mechanical strength, wear resistance, and elastic recovery performance of fluororubber, preventing the sealing ring from deforming or breaking due to compression and friction during long-term use, and ensuring its long-lasting sealing performance. The annular guide groove with an isosceles trapezoidal cross-section opened on the inner wall of the elastic sealing ring 24 plays multiple roles in the sealing process: on the one hand, when a small amount of coolant seeps into the inner side of the sealing ring, the annular guide groove can guide the coolant to a specific area, preventing the coolant from accumulating on the sealing surface and causing excessive pressure, thereby reducing the risk of leakage; on the other hand, the structural design of the guide groove can increase the contact area between the sealing ring and the metal bellows 21 and the micro hydraulic cylinder 22, improve the tightness of the connection between the three, and further enhance the overall sealing effect.

[0025] As one implementation method in this embodiment, please refer to Figures 1-3 As shown, the power assembly 4 includes a drive motor and a transmission shaft. One end of the transmission shaft is rigidly connected to the output shaft of the drive motor via a coupling, and the other end extends into the interior of the car water pump and is fixedly connected to the impeller. The external thread of the connector 5 and the internal thread of the connection hole of the car water pump have a matching accuracy of 6H / 6g. A nitrile rubber sealing gasket is fitted at the connection between the connector 5 and the car water pump. The thickness of the nitrile rubber sealing gasket is 1.5mm-2mm.

[0026] In power assembly 4, the drive motor is rigidly connected to the drive shaft via a coupling. This rigid connection ensures that the drive motor's power is efficiently and losslessly transmitted to the drive shaft, preventing unstable power transmission due to loose connections. This, in turn, ensures that the drive shaft drives the impeller to rotate at a uniform speed, providing stable pumping power to the water pump and ensuring smooth coolant circulation. The other end of the drive shaft extends into the water pump and is fixedly connected to the impeller. The stable rotation of the impeller creates a negative pressure within the water pump housing 1, drawing in coolant and pressurizing it for discharge, thus meeting the cooling requirements of the automotive engine. The external thread of connector 5 and the internal thread of the water pump connection hole have a precision of 6H / 6g. This high-precision thread fit minimizes thread clearance, reducing the possibility of coolant leakage from thread gaps and providing a basic sealing guarantee for the connection between connector 5 and the water pump housing 1. Meanwhile, a 1.5mm-2mm thick nitrile rubber sealing gasket is fitted at the connection between the connector 5 and the water pump. Nitrile rubber has good elasticity and oil resistance, and can further fill the connection gap on the basis of the threaded connection. Through the elastic deformation of the gasket itself, it tightly fits the connection surface between the connector 5 and the water pump housing 1, forming a second sealing barrier, which effectively prevents coolant leakage.

[0027] Working principle: The power unit 4 located on the upper side of the center of the water pump housing 1 provides power to drive the impeller to rotate, thereby achieving the intake and discharge of coolant and meeting the heat dissipation needs of the car. The bracket 3 on one side of the water pump housing 1 is used to fix the water pump, ensuring its structural stability during operation and preventing vibration and displacement from affecting its function. The pump housing 1 has a double-seal structure 2 on one side at both ends, which is connected to the housing via a threaded connector 5. In the double-seal structure 2, a metal bellows 21 made of 316L stainless steel with an external alumina ceramic coating is threaded into the inner cavity of the connector 5, providing structural support and accommodating small displacements. The micro hydraulic cylinder 22 in the upper inner cavity can monitor changes in sealing pressure to provide early warning of abnormalities. The 2-3 paired 50CrVA spring steel disc springs 23 at the upper end of the micro hydraulic cylinder 22 can provide continuous and stable pressure and compensate for vibration and wear. The fluororubber and nano-silica composite modified elastic sealing ring 24 at the upper end of the disc spring 23 and sleeved on the outside of each component forms a core seal by tightly fitting the sealing surface. The guide groove can also guide the leaking coolant and relieve the stress of thermal expansion and contraction. The synergistic effect of each component achieves double-seal redundancy and significantly reduces the risk of coolant leakage.

[0028] The above embodiments are only used to illustrate the technical solution of this utility model, and are not intended to limit it.

Claims

1. A dual-seal redundant design automotive water pump, characterized in that: The system includes a water pump housing (1), with double-seal structures (2) for improving sealing at both ends of the water pump housing (1) near one side. A bracket (3) for fixing the water pump is fixedly connected to one side of the water pump housing (1). A power assembly (4) for providing power to the water pump is fixedly connected to the upper side of the center of the water pump housing (1). A connector (5) for connection is fixedly connected between the water pump housing (1) and the double-seal structures (2), and the inner cavity of the connector (5) is threaded. The double-seal structures (2) include... The device includes a metal bellows (21), which is threaded into the inner cavity of the connector (5). A miniature hydraulic cylinder (22) is fixedly connected to the inner cavity at the upper end of the metal bellows (21). A disc spring (23) is fixedly connected to the upper end of the miniature hydraulic cylinder (22), and the disc spring (23) is fixedly connected to the upper end of the metal bellows (21). An elastic sealing ring (24) is fixedly connected to the upper end of the disc spring (23), and the elastic sealing ring (24) is sleeved on the outer surface of the connector (5).

2. The dual-seal redundant design automotive water pump according to claim 1, characterized in that: The metal corrugated pipe (21) is made of 316L stainless steel, with a wall thickness of 0.3mm-0.5mm, and the outer surface of the metal corrugated pipe (21) is coated with an alumina ceramic coating of 0.1mm-0.2mm thickness.

3. The dual-seal redundant design automotive water pump according to claim 1, characterized in that: The inner cavity of the micro hydraulic cylinder (22) is filled with inert hydraulic oil compatible with automotive water pump coolant, and a micro pressure sensor is installed on the side wall of the micro hydraulic cylinder (22). The detection range of the micro pressure sensor is 0.1MPa-2.0MPa, and the accuracy is ±0.02MPa.

4. The dual-seal redundant design automotive water pump according to claim 1, characterized in that: The number of disc springs (23) is 2-3 pieces, and multiple disc springs (23) are arranged in a paired combination. The material of the disc springs (23) is 50CrVA spring steel. The working stroke of the disc springs (23) is 1.5mm-3mm, and the rated spring force is 50N-80N.

5. A dual-seal redundant design automotive water pump according to claim 1, characterized in that: The elastic sealing ring (24) is made of a composite modified material of fluororubber and nano silica, and the inner wall of the elastic sealing ring (24) is provided with an annular guide groove. The cross-section of the annular guide groove is an isosceles trapezoid with a groove width of 0.8mm-1.2mm and a groove depth of 0.5mm-0.7mm.

6. The dual-seal redundant design automotive water pump according to claim 1, characterized in that: The power assembly (4) includes a drive motor and a transmission shaft. One end of the transmission shaft is rigidly connected to the output shaft of the drive motor through a coupling, and the other end extends into the interior of the car water pump and is fixedly connected to the impeller. The external thread of the connector (5) and the internal thread of the connection hole of the car water pump have a matching accuracy of 6H / 6g. A nitrile rubber sealing gasket is provided at the connection between the connector (5) and the car water pump. The thickness of the nitrile rubber sealing gasket is 1.5mm-2mm.

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