A pump structure for reducing backflow

Abstract

The utility model relates to the technical field of fluid machinery, in particular to a pump structure of backflow reduction, which provides structural reliability for sealing effect under subsequent different working conditions, is simple in structure, small in space occupation, perfectly adapts to the application scene of electronic water pump "high speed, small size", avoids the adaptation conflict of traditional complex sealing structure and small pump body, and comprises a pump shell, a composite sealing ring, a metal supporting ring, a steel ring, an impeller and a stator casing assembly, the composite sealing ring is pressed and fitted in the inner circle of the pump shell, the metal supporting ring is embedded in the inside of the composite sealing ring, the steel ring is fixedly installed on the impeller and rotates synchronously with the impeller, the impeller and the stator casing assembly are cooperatively installed in the pump shell, and the main part of the composite sealing ring is provided with a V-shaped opening towards the outlet side of the impeller, and the V-shaped opening constitutes a flexible lip.

Description

Technical Field

[0001] This utility model relates to the technical field of fluid machinery, and in particular to a pump structure that reduces backflow. Background Technology

[0002] With increasingly stringent requirements for energy conservation and environmental protection, water pumps, as a key power source for fluid transportation, must meet the core standards of high efficiency and low energy consumption. The core function of a water pump is to transfer the mechanical energy of a prime mover or other external energy to a liquid, thereby achieving liquid transportation or pressurization. It can be used to transport various media such as water, oil, acid and alkali solutions, emulsions, suspensions, and liquid metals.

[0003] Among them, electric water pumps, as a common type of pump, typically consist of a motor, an impeller (mostly a closed impeller), and a pump casing. During operation, the impeller rotates at high speed within the pump casing to drive fluid flow. However, a gap inevitably exists between the impeller and the pump casing due to assembly requirements. Since the impeller outlet is a high-pressure zone and the inlet is a low-pressure zone, the pressure difference between the two can cause the high-pressure fluid to flow back through this gap to the low-pressure inlet. This backflow problem leads to a series of drawbacks: 1. Reduced volumetric efficiency: Some of the fluid that has completed energy transfer is recycled due to backflow, resulting in a significant decrease in the effective flow rate and head of the water pump; 2. Reduced hydraulic efficiency: The return fluid and the main flow body interfere with each other, which can easily generate eddies in the pump and cause additional energy loss. 3. Increased noise and vibration: Backflow and eddies induce fluid dynamic noise and may also cause pump body vibration, affecting the stability of equipment operation.

[0004] To address the backflow problem, existing technologies often employ fixed-gap seals (such as labyrinth seals) or contact mechanical seals. However, fixed-gap seals cannot dynamically adjust according to pressure changes under static clearance conditions, making it difficult to completely eliminate backflow. Contact mechanical seals, on the other hand, experience wear and heat generation due to long-term contact, significantly shortening their service life and making them particularly unsuitable for high-speed small electric water pumps. Utility Model Content

[0005] To solve the above-mentioned technical problems, this utility model provides a pump structure that reduces backflow.

[0006] This utility model discloses a pump structure for reducing backflow, comprising a pump casing, a composite sealing ring, a metal support ring, a steel ring, an impeller, and a stator housing assembly. The composite sealing ring is press-fitted into the inner ring of the pump casing, the metal support ring is embedded inside the composite sealing ring, and the steel ring is fixedly mounted on the impeller and rotates synchronously with the impeller. The impeller and the stator housing assembly are fitted together and installed inside the pump casing. The main body of the composite sealing ring has a V-shaped opening facing the impeller outlet side, and this V-shaped opening forms a flexible lip. Through the structural combination of "composite sealing ring (V-shaped opening flexible lip) + steel ring (rotating with the impeller)," the traditional fixed gap sealing or connection method is broken. The single design of the contact mechanical seal provides a structural carrier for the dynamic adaptive function of "high-pressure sealing and low-pressure / shutdown disconnection", fundamentally solving the pain points of traditional seals that are "either severely backflowed or worn quickly". The design of the metal support ring embedded in the composite sealing ring avoids the problem of "overall compression deformation and loss of sealing direction" of the elastomeric sealing ring under high pressure, ensuring that the sealing ring deforms only in the direction of the steel ring, providing structural reliability for the sealing effect under different operating conditions. The structure is simple and occupies little space, perfectly adapting to the "high-speed and small" application scenarios of electronic water pumps, avoiding the compatibility conflict between traditional complex sealing structures and small pump bodies.

[0007] Preferably, the metal support ring is used to provide structural support for the composite sealing ring, restricting the composite sealing ring to elastic deformation only in the direction of the rotating component where the steel ring is located, thus avoiding overall compression deformation of the composite sealing ring under high pressure; by limiting "only allowing the composite sealing ring to deform in the direction of the rotating component (steel ring)," the direction of sealing deformation can be precisely controlled, the service life of the composite sealing ring can be extended, and the dependence on assembly accuracy can be reduced.

[0008] Preferably, the steel ring is a rigid ring structure, and its fixed connection with the impeller is any one of welding, bolting, or interference fit. The sealing surface of the steel ring is a smooth and flat annular end face. The "rigid ring structure" and "smooth and flat annular sealing surface" of the steel ring can form a "hard-soft" matching sealing pair with the flexible lip of the composite sealing ring. The rigid sealing surface avoids the fitting gap caused by the deformation of the rotating parts, while the smooth surface reduces the sliding friction resistance of the lip, which ensures the sealing effect and reduces lip wear.

[0009] Preferably, the composite sealing ring is made of an elastomer material, which is any one of fluororubber, silicone rubber, or polyurethane, and the metal support ring is made of any one of stainless steel, aluminum alloy, or engineering plastic. The use of fluororubber, silicone rubber, or polyurethane as the material for the composite sealing ring, and stainless steel, aluminum alloy, or engineering plastic as the material for the metal support ring, improves the adaptability to the medium and temperature, and balances performance and cost.

[0010] Preferably, under low pressure differential conditions, the V-shaped opening of the composite sealing ring experiences less pressure, and the deformation of the composite sealing ring is sufficient to maintain a non-contact state with the steel ring, thus preventing dry friction.

[0011] Preferably, under high pressure differential conditions, the fluid pressure acts on the V-shaped opening of the composite sealing ring, causing the flexible lip to elastically deform towards the impeller outlet side and the steel ring direction. The flexible lip is tightly attached to the sealing surface of the steel ring, forming a contact sealing pair.

[0012] Preferably, when the pump stops or is short of water, the V-shaped opening of the composite sealing ring loses fluid pressure, the flexible lip disengages from the sealing surface of the steel ring, and returns to its initial undeformed state.

[0013] Compared with existing technologies, the advantages of this utility model are as follows: By combining a composite sealing ring (V-shaped opening flexible lip) with a steel ring (rotating with the impeller), it breaks away from the single design of traditional fixed gap seals or contact mechanical seals, providing a structural carrier for the dynamic adaptive function of "high-pressure sealing and low-pressure / shutdown disconnection". This fundamentally solves the pain points of traditional seals, which are either "severe backflow or rapid wear". The design of embedding the metal support ring into the composite sealing ring avoids the problem of "overall compression deformation and loss of sealing direction" of the elastomeric sealing ring under high pressure, ensuring that the sealing ring deforms only in the direction of the steel ring. This provides structural reliability for the sealing effect under different working conditions. The structure is simple and occupies little space, perfectly adapting to the "high-speed and small" application scenarios of electronic water pumps, avoiding the compatibility conflict between traditional complex sealing structures and small pump bodies. Attached Figure Description

[0014] Figure 1 This is an exploded structural diagram of the present invention; Figure 2 This is a cross-sectional structural schematic diagram of the present invention; Figure 3 yes Figure 2 A partially enlarged structural diagram of section A in the middle; Figure 4 This is a schematic diagram of the first isometric structure of this utility model; Figure 5 This is a schematic diagram of the second isometric structure of this utility model.

[0015] The following are labels in the attached diagram: 1. Pump casing; 2. Composite sealing ring; 3. Metal support ring; 4. Steel ring; 5. Impeller; 6. Stator housing assembly. Detailed Implementation

[0016] To facilitate understanding of this utility model, a more complete description will be given below with reference to the accompanying drawings. This utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to make the disclosure of this utility model more thorough and complete.

[0017] Example 1 like Figures 1 to 5 As shown, a pump structure for reducing backflow according to this utility model includes a pump casing 1, a composite sealing ring 2, a metal support ring 3, a steel ring 4, an impeller 5, and a stator housing assembly 6. The composite sealing ring 2 is press-fitted into the inner ring of the pump casing 1, the metal support ring 3 is embedded inside the composite sealing ring 2, the steel ring 4 is fixedly installed on the impeller 5 and rotates synchronously with the impeller 5, the impeller 5 and the stator housing assembly 6 are fitted and installed inside the pump casing 1, and the main body of the composite sealing ring 2 is provided with a V-shaped opening facing the outlet side of the impeller 5, the V-shaped opening forming a flexible lip. The metal support ring 3 is used to provide structural support for the composite sealing ring 2, restricting the composite sealing ring 2 to elastically deform only in the direction of the rotating component where the steel ring 4 is located, and preventing the composite sealing ring 2 from undergoing overall extrusion deformation under high pressure. The steel ring 4 is a rigid ring structure, and its fixed connection with the impeller 5 is any one of welding, bolt connection or interference fit. The sealing surface of the steel ring 4 is a smooth and flat annular end face. The composite sealing ring 2 is made of an elastomer material, which is any one of fluororubber, silicone rubber or polyurethane, and the metal support ring 3 is made of any one of stainless steel, aluminum alloy or engineering plastic. Under low pressure differential conditions, the V-shaped opening of the composite sealing ring 2 is subjected to relatively small pressure, and the deformation of the composite sealing ring 2 is sufficient to maintain a non-contact state with the steel ring 4, without generating dry friction. Under high pressure differential, the fluid pressure acts on the V-shaped opening of the composite sealing ring 2, causing the flexible lip to elastically deform towards the outlet side of the impeller 5 and the steel ring 4. The flexible lip is tightly attached to the sealing surface of the steel ring 4, forming a contact sealing pair. When the pump stops or is short of water, the V-shaped opening of the composite sealing ring 2 loses fluid pressure, the flexible lip separates from the sealing surface of the steel ring 4, and returns to its initial undeformed state.

[0018] In this embodiment, through the innovative design of "dynamic adaptive sealing," the pain points of traditional water pump sealing technology are overcome from multiple dimensions such as structure, performance, operating condition adaptability, cost, and lifespan. It "suppresses backflow at the source," significantly improving water pump efficiency and meeting the needs of energy conservation and environmental protection. The "contactless-contact" intelligent switching completely solves the problem of wear on sealing components, extending equipment lifespan. The structure is simple and reliable, with no additional control mechanism, adaptable to miniaturization and complex operating conditions. The materials and structure are flexibly adaptable, covering the needs of multiple media and multiple scenarios, reducing the total life cycle cost, and possessing both technical and economic value. In summary, this patent, through five core beneficial effects of "efficiency improvement, wear avoidance, structural reliability, scenario adaptability, and cost optimization," not only solves the technical pain points of traditional water pumps such as "severe backflow, short lifespan, and poor adaptability," but also brings economic benefits to end users. It has extremely high technical innovation and market promotion value and can be widely used in fields such as electronic water pumps, automotive cooling systems, industrial circulation systems, and medical equipment.

[0019] The composite sealing ring 2 of the pump structure for reducing backflow of this utility model is commercially available. Technical personnel in this industry only need to install and operate it according to the accompanying instruction manual, without requiring any creative work from those skilled in the art.

[0020] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A pump structure for reducing backflow, comprising a pump casing (1), a composite sealing ring (2), a metal support ring (3), a steel ring (4), an impeller (5), and a stator housing assembly (6); characterized in that, The composite sealing ring (2) is press-fitted into the inner ring of the pump housing (1). The metal support ring (3) is embedded inside the composite sealing ring (2). The steel ring (4) is fixedly installed on the impeller (5) and rotates synchronously with the impeller (5). The impeller (5) and the stator housing assembly (6) are fitted together and installed inside the pump housing (1). The main body of the composite sealing ring (2) is provided with a V-shaped opening facing the outlet side of the impeller (5). The V-shaped opening forms a flexible lip.

2. The pump structure for reducing backflow as described in claim 1, characterized in that, The metal support ring (3) is used to provide structural support for the composite sealing ring (2), restricting the composite sealing ring (2) to elastically deform only in the direction of the rotating component where the steel ring (4) is located, and preventing the composite sealing ring (2) from undergoing overall extrusion deformation under high pressure.

3. The pump structure for reducing backflow as described in claim 1, characterized in that, The steel ring (4) is a rigid ring structure, and its fixed connection with the impeller (5) is any one of welding, bolt connection or interference fit. The sealing surface of the steel ring (4) is a smooth and flat annular end face.

4. The pump structure for reducing backflow as described in claim 1, characterized in that, The composite sealing ring (2) is made of an elastomer material, which is any one of fluororubber, silicone rubber or polyurethane, and the metal support ring (3) is made of any one of stainless steel, aluminum alloy or engineering plastic.

5. The pump structure for reducing backflow as described in claim 1, characterized in that, Under low pressure differential conditions, the V-shaped opening of the composite sealing ring (2) is subjected to less pressure, and the deformation of the composite sealing ring (2) is sufficient to maintain a non-contact state with the steel ring (4), and no dry friction phenomenon is generated.

6. The pump structure for reducing backflow as described in claim 1, characterized in that, Under high pressure differential, the fluid pressure acts on the V-shaped opening of the composite sealing ring (2), causing the flexible lip to elastically deform towards the outlet side of the impeller (5) and the steel ring (4). The flexible lip is tightly attached to the sealing surface of the steel ring (4) to form a contact sealing pair.

7. The pump structure for reducing backflow as described in claim 1, characterized in that, When the pump stops or is short of water, the V-shaped opening of the composite sealing ring (2) loses fluid pressure, and the flexible lip separates from the sealing surface of the steel ring (4), returning to its initial undeformed state.

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