Blowing and washing pump

Abstract

A purging pump comprises a shell, a transmission hole is formed in the shell, a rotor sleeve, a bearing and a mandrel are arranged in the transmission hole, the bearing comprises an inner ring, an outer ring and balls arranged between the inner ring and the outer ring, the inner ring is fixed to the outer surface of the mandrel and is in transmission connection with the mandrel, and the outer ring is fixed to the outer surface of the mandrel. The outer diameter face of the outer ring abuts against the inner diameter face of the rotor sleeve, an expansion groove is formed in the inner diameter face of the rotor sleeve, a damping piece is arranged in the expansion groove, and the two ends of the damping piece abut against the groove bottom of the expansion groove and the outer ring respectively and are used for preventing relative rotation between the outer ring and the rotor sleeve. The blow washing pump has the advantages that the expansion groove is formed in the inner diameter face of the rotor sleeve, the damping piece is installed, the anti-rotation function between the outer ring and the rotor sleeve is achieved, the high-precision machining requirement caused by the fact that the expansion groove is formed in the bearing outer ring in the traditional design is avoided, and therefore the production cost of the blow washing pump is reduced.

Description

Technical Field

[0001] The utility model relates to an automobile accessory, in particular to a blowing and cleaning pump. Background Art

[0002] In the automotive industry, the purge pump is a key component of the evaporative emission control system (EVAP system). It is mainly used to treat volatile organic compound (VOC) vapors generated in the fuel tank to prevent harmful gases from being emitted into the atmosphere and comply with environmental regulations. Specific application scenarios include the engine compartment of gasoline or hybrid vehicles. When the engine is started, the ECU controls the activation of the purge pump. Through vacuum or electric drive, the fuel vapor adsorbed in the activated carbon canister is sucked into the intake manifold and consumed during the engine combustion process, thereby achieving efficient emission reduction. The use process involves a centrifugal mechanism inside the pump body. The motor drives the rotor assembly to rotate, generating negative pressure suction. The entire cycle is automatically executed during vehicle operation, ensuring system reliability and long-term stability while reducing fuel waste. This design is widely used in passenger cars and commercial vehicles and is the foundation of modern emission control technology.

[0003] However, the existing technology of the purge pump has significant defects in the centrifugal mechanism, mainly involving the fixing method between the outer ring of the miniature bearing sleeved outside the core shaft and the rotor sleeve. The current practice is to directly purchase finished miniature bearings, whose outer rings have a preset annular groove and a built-in sealing ring, and are fixed to the inner wall of the rotor sleeve through the elastic expansion of the sealing ring to form a reliable connection. However, due to the customized design and material requirements of this special non-standard bearing, the production cost is extremely high, which greatly increases the overall manufacturing cost of the purge pump. In addition, since this finished miniature bearing has grooves on the outer ring, the structural strength of the finished miniature bearing is reduced. In order to increase its service life, it is necessary to increase the material requirements, further increasing the purchase cost of this finished miniature bearing. In addition, reliance on finished bearings limits design flexibility, making it impossible to optimize size or performance for different vehicle models, and increasing supply chain risks. Therefore, there is an urgent need to develop a low-cost alternative to reduce material costs and improve product competitiveness. Utility Model Content

[0004] In view of the deficiencies in the prior art, the utility model provides a purge pump which has a lower cost than purchasing finished product miniature non-standard bearings.

[0005] To achieve the above-mentioned purpose, the technical solution of the present invention is as follows: A purge pump, comprising a shell, a transmission hole is provided on the shell, a rotor sleeve, a bearing and a core shaft are provided in the transmission hole, the bearing comprises an inner ring, an outer ring and a ball arranged between the inner ring and the outer ring, the inner ring is fixed to the outer surface of the core shaft and forms a transmission connection with the core shaft, the outer diameter surface of the outer ring abuts against the inner diameter surface of the rotor sleeve, the inner diameter surface of the rotor sleeve is provided with a tightening groove, a damping member is provided in the tightening groove, the two ends of the damping member respectively abut against the bottom of the expansion groove and the outer ring and are used to prevent relative rotation between the outer ring and the rotor sleeve.

[0006] The present invention achieves the following beneficial effects: by providing an expansion groove on the inner diameter surface of the rotor sleeve and installing a damping element, an anti-rotation function is achieved between the outer ring and the rotor sleeve. This avoids the high-precision machining requirements associated with traditional designs that place the expansion groove on the bearing outer ring, thereby reducing the production cost of the purge pump. This simplifies the bearing manufacturing process. For example, no additional grooves are required on the bearing outer ring, reducing the risk of accumulated machining errors and improving assembly reliability and long-term stability. The lack of additional grooves ensures the integrity of the bearing outer ring, further extending the bearing's service life. Furthermore, this design reduces the tolerance requirements of the overall components, effectively suppressing vibration and noise during high-speed operation of the purge pump and extending its service life. Preferably, the expansion groove can be designed as an annular groove, its depth and width precisely machined using a CNC machine tool to ensure that the damping element (such as an elastic O-ring) is securely embedded within it. During assembly, the damping element generates radial friction through pre-compression deformation. When the outer ring is subjected to torque, this friction is directly converted into anti-rotation resistance, eliminating the need for complex locking mechanisms and simplifying the installation process. Another preferred method is that the expansion groove adopts a stepped structure, and a micro-protrusion is set at the bottom of the groove to increase the anchoring effect of the damping element. In this way, during the operation of the pump body, the elastic deformation of the damping element can adaptively compensate for the thermal expansion difference, prevent loosening, and further improve the anti-rotation reliability.

[0007] Furthermore, the damping member is elastic, and the outer ring and the rotor sleeve respectively abut against two ends of the damping member, causing the damping member to deform.

[0008] This elastic deformation design enhances the anti-rotation performance of the damping element, provides continuous pressure through the restoring force of the material itself, ensures that the outer ring and the rotor sleeve maintain close contact under dynamic loads, and avoids wear and energy loss caused by relative sliding. Specifically, elastic deformation allows the damping element to automatically adapt to tolerance changes during assembly, improves the fault tolerance of the component, and reduces the risk of failure due to processing errors; at the same time, during the start-up and shutdown or speed change of the pump body, the deformation can absorb impact energy and reduce vibration transmission, thereby improving overall operating smoothness and noise control. As a preferred method, the damping element can be made of a cylindrical gasket made of rubber or silicone material, and its elastic modulus is selected to generate a uniform radial force when compressed and deformed. When pressure is applied to the outer ring, the gasket expands to both sides, the friction force increases, and a self-locking effect is formed; in terms of working principle, the structure maintains a constant contact pressure through elastic restoring force, without the need for external adjustment, which simplifies maintenance. Another preferred method is to design the damping element as a multi-layer corrugated spring leaf structure, in which the crests and troughs are arranged alternately, bending and deforming when under pressure, thereby increasing the contact area and damping effect; in this way, during high-speed rotation, the elastic deformation of the spring leaf can dynamically offset the influence of centrifugal force, prevent the outer ring from shifting, and ensure the stability of the anti-rotation function under extreme working conditions.

[0009] Furthermore, one end of the damping member facing the outer ring protrudes out of the opening of the expansion groove.

[0010] This protruding design precisely controls the pre-compression deformation of the damping element, ensuring sufficient contact pressure during the initial assembly phase and avoiding anti-rotation failure due to clearance. The protruding end directly abuts the outer ring, and the deformation can be adjusted through geometric dimensions, optimizing the damping effect. It also allows the damping element to adaptively rebound when the pump body expands thermally or the load changes, maintaining a constant anti-rotation force, reducing wear and extending component life. Furthermore, the protruding structure simplifies the installation process, allowing operators to confirm the position by sight or touch, improving assembly accuracy and efficiency. As a preferred method, the protruding portion is chamfered (e.g., a 45-degree bevel) corresponding to the opening of the expansion groove to facilitate smooth guidance and compression of the damping element during press-in. In terms of its working principle, when the protruding end of the damping element is compressed, its material contracts into the groove, generating a reverse elastic force that firmly locks the outer ring and prevents any slight rotation. Another preferred method is to adopt a spherical or conical head structure for the protruding end to match the outer ring surface, increase stress concentration at the contact point, and enhance friction damping through local deformation under dynamic conditions; in this way, when the pump body is running at high speed, the structure can effectively disperse the impact force, avoid fatigue cracks caused by stress concentration, and improve overall durability.

[0011] Furthermore, one end of the damping member facing the outer ring abuts against the center of the outer ring.

[0012] The center-contact design optimizes force distribution, ensuring that the damping element's pressure is evenly applied to the outer ring's center area, avoiding localized wear or unbalanced vibration caused by eccentric loading. This improves anti-rotation stability and reliability, especially under high-speed or variable-load conditions. Centered contact reduces the risk of outer ring deformation, ensuring smooth bearing operation. It also simplifies damping element positioning and reduces assembly complexity. Furthermore, center alignment helps maintain force balance during thermal expansion, extending component life. In one preferred embodiment, the damping element's end is machined into a concave arc surface that matches the curvature of the outer ring's outer diameter. Precise alignment ensures the contact point is located on the centerline. Operating principle: During assembly, the rotor sleeve's guiding structure (such as the inner wall boss) automatically adjusts the position. When the outer ring is compressed, the concave surface engages, generating a uniform radial force and preventing slippage. Another preferred embodiment is an axial locating pin positioned at the bottom of the expansion groove. The damping element is secured via a pin hole, ensuring its end is always aligned with the outer ring's center. This pin limits damping element deflection during pump vibration, maintaining center contact, enhancing anti-rotation effectiveness, and reducing noise.

[0013] Furthermore, the axial width of the damping member is at least one quarter of the axial width of the outer ring.

[0014] This width ratio ensures the damping element provides sufficient contact area and elastic reserve, enhancing the durability and stability of the anti-rotation force and preventing local overload or rapid failure caused by insufficient width. Specifically, the larger width disperses pressure, reduces wear per unit area, and improves wear resistance. Furthermore, under axial vibration or impact loads, the width provides a buffer, allowing the damping element to fully deform and absorb energy, thereby protecting the bearing structure and extending the life of the entire pump body. Furthermore, this dimension optimizes material utilization, balancing manufacturing cost and performance requirements. As a preferred approach, the damping element adopts a segmented, multi-layered axial width (e.g., stacked elastic sheets), with each layer deforming independently to increase overall flexibility and damping capacity. Operating principle: During operation, the multi-layered structure distributes the load through progressive compression, maintaining uniform pressure distribution. Another preferred approach is to design the damping element's axial edge with a sloped transition to reduce stress concentration points. When axial force is applied to the outer ring, the slope guides deformation toward the center, preventing edge tearing. This structure effectively suppresses resonance under high-frequency vibration conditions, ensuring consistent anti-rotation performance over long-term use. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the utility model;

[0016] Figure 2 This is an axonometric view of the rotor sleeve and bearing according to an embodiment of the present utility model;

[0017] Figure 3 This is a disassembled diagram of the rotor sleeve and bearing according to an embodiment of the present utility model;

[0018] Figure 4 This is a partial perspective view of the installation location of the damping member according to an embodiment of the present utility model. DETAILED DESCRIPTION

[0019] The utility model embodiment of a purge pump such as Figure 1-4 The structure shown in the figure comprises a housing 1 with a transmission hole 11. A rotor sleeve 2, a bearing 3, and a core shaft (not shown) are mounted within the transmission hole 11. The bearing 3 is a standard miniature bearing, comprising an inner ring 31, an outer ring 32, and balls (not shown) disposed between the inner and outer rings 31 and 32. The balls (not shown) enable the rolling function of the bearing 3. The inner ring 31 is fixed to the outer surface of the core shaft (not shown) and forms a transmission connection with the core shaft (not shown), transmitting the rotational energy of the core shaft (not shown) to the inner ring 31. The outer diameter of the outer ring 32 abuts against the inner diameter of the rotor sleeve 2 for support. An expansion groove 21 is machined into the inner diameter of the rotor sleeve 2. A damping element 5 is positioned within the expansion groove 21. The two ends of the damping element 5 abut against the bottom of the expansion groove 21 and the outer ring 32, respectively, to prevent relative rotation between the outer ring 32 and the rotor sleeve 2. The damping member 5 is elastic. When the outer ring 32 and the rotor sleeve 2 respectively abut against its ends, the damping member 5 deforms, thereby achieving an anti-rotation effect through elastic deformation. The end of the damping member 5 facing the outer ring 32 protrudes beyond the opening of the expansion groove 21 and abuts the center of the outer ring 32. The axial width of the damping member 5 is at least one-quarter the axial width of the outer ring 32 to ensure sufficient contact area and stability.

[0020] The operating principle of this embodiment is as follows: The core shaft (not shown) rotates via an external drive, driving the inner ring 31 of the bearing 3 fixed to it. Due to the elastic deformation of the damping element 5, it abuts the bottom of the expansion groove 21 and the center of the outer ring 32, generating a continuous compressive force that firmly secures the outer ring 32 to the inner diameter of the rotor sleeve 2 and prevents relative rotation between the two. Furthermore, the damping element 5 protrudes beyond the opening of the expansion groove, resulting in an inner diameter smaller than that of the rotor sleeve 2 when not installed. During installation, the deformation creates a tight fit. This structure eliminates the need to machine an expansion groove on the outer ring 32 of the miniature bearing, reducing the machining precision requirements of the bearing 3 and thus production costs. The rolling of the balls (not shown) ensures low-friction operation of the bearing 3, while the placement of the expansion groove 21 on the rotor sleeve 2 simplifies the machining process and reduces production costs.

[0021] The above embodiment is only one preferred embodiment of the present invention. Common changes and substitutions made by those skilled in the art within the scope of the technical solution of the present invention are all included in the protection scope of the present invention.

Claims

1. A purge pump, comprising a housing, a transmission hole provided in the housing, a rotor sleeve, a bearing, and a core shaft disposed within the transmission hole, the bearing comprising an inner ring, an outer ring, and balls disposed between the inner and outer rings, the inner ring being fixed to the outer surface of the core shaft and forming a transmission connection therewith, the outer diameter surface of the outer ring abutting against the inner diameter surface of the rotor sleeve, characterized in that: An expansion groove is provided on the inner diameter surface of the rotor sleeve, and a damping member is provided in the expansion groove. The two ends of the damping member respectively abut against the bottom of the expansion groove and the outer ring and are used to prevent relative rotation between the outer ring and the rotor sleeve.

2. The purge pump according to claim 1, characterized in that: The damping member is elastic, and the outer ring and the rotor sleeve respectively abut against two ends of the damping member to cause the damping member to deform.

3. The purge pump according to claim 2, characterized in that: One end of the damping member facing the outer ring protrudes out of the opening of the expansion groove.

4. The purge pump according to claim 2, characterized in that: One end of the damping member facing the outer ring abuts against the center of the outer ring.

5. The purge pump according to claim 4, characterized in that: The axial width of the damping element is at least one quarter of the axial width of the outer ring.

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