Cooling structure of semi-enclosed vacuum pump oil tank
Patent Information
- Application Number
- CN202522228864.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-10-22
- Publication Date
- 2026-09-25
- Estimated Expiration
- 2035-10-22
AI Technical Summary
这种常规的侧向出风设计存在一个显著缺陷：冷却气流在离开防护罩后迅速扩散，无法有效地吹向位于真空泵前部的油箱
本实用新型创造性地将电机防护罩的出风口设置于前端并朝向油箱，并取消原防护罩侧面的出风孔，使得已完成电机散热的冷却气流被直接引导至油箱表面，实现对油箱的强制风冷，实现了“一风两用”的协同冷却效果，在40℃环境温度下，可将油箱表面温度从95℃以上显著降低至75℃以下，彻底消除了烫伤风险，且无需为油箱增加任何额外的散热部件，仅通过改变防护罩外形以及其与支架的配合关系，即可实现强大的散热功能，结构极其简单，几乎不增加额外成本。
Smart Images
Figure CN224800443U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of vacuum pump technology, and in particular to a cooling structure for a semi-enclosed vacuum pump oil tank. Background Technology
[0002] Conventional semi-enclosed vacuum pumps have their motors entirely covered by a plastic protective cover for safety and electromagnetic shielding. Cooling air enters from the rear of the cover and, after flowing through the motor and PCB control system, typically exits through vents on the left and / or right side of the cover. This conventional side-exit design has a significant drawback: the cooling airflow diffuses rapidly after leaving the cover, failing to effectively reach the oil tank located at the front of the vacuum pump. Therefore, the oil tank's heat dissipation relies primarily on natural convection, which is inefficient and leads to excessively high operating temperatures. At an ambient temperature of 40°C, the surface temperature of the oil tank can even exceed 95°C, posing a significant safety hazard of burns to users and potentially affecting the performance and lifespan of the vacuum pump oil.
[0003] When faced with the problem of fuel tank overheating, those skilled in the art typically address it by adding an independent cooling device, such as heat sink fins or a separate fan. This approach increases the number of parts, structural complexity, and manufacturing costs, and fails to efficiently utilize existing cooling resources at the root of the problem. Utility Model Content
[0004] The technical problem to be solved by this utility model is to overcome the above-mentioned problems and provide a semi-enclosed vacuum pump oil tank cooling structure that can efficiently utilize the motor cooling air to synergistically dissipate heat from the oil tank. The structure is simple, the cost is low, and the effect is significant.
[0005] The technical solution of this utility model is: The present invention discloses a semi-enclosed vacuum pump oil tank cooling structure, wherein the vacuum pump includes an oil tank, a motor, and a protective cover covering the motor, and an air inlet is provided on the rear side of the protective cover. The characteristic feature is that the front end of the protective cover is provided with an air outlet facing the oil tank.
[0006] Furthermore, in the semi-enclosed vacuum pump oil tank cooling structure described in this utility model, the air outlet is formed between the protective cover and a bracket, and the bracket is disposed between the oil tank and the motor. The air duct is formed by utilizing the existing bracket and protective cover; this can be achieved simply by changing the shape of the protective cover, without introducing additional complex parts, resulting in extremely low cost.
[0007] Furthermore, in the semi-enclosed vacuum pump oil tank cooling structure described in this utility model, the upper and lower walls of the protective cover are sealed with the bracket, while gaps are left between the left and right walls and the bracket, thus forming two air outlets located on the left and right sides respectively. Through this specific layout of "sealed upper and lower, with gaps on the left and right sides," the cooling airflow can be precisely directed to the two largest sides of the oil tank, achieving efficient and uniform coverage of the main heat dissipation surfaces and resulting in high cooling efficiency.
[0008] Furthermore, in the semi-enclosed vacuum pump oil tank cooling structure described in this utility model, the width of the gap is 3mm or more. This size range ensures sufficient airflow to achieve a significant cooling effect while avoiding weakening the structural strength or causing excessive airflow dispersion due to an excessively large gap.
[0009] Furthermore, in the semi-enclosed vacuum pump oil tank cooling structure described in this utility model, the left and right side walls of the protective cover are inclined inwards, making the front end of the protective cover constricted. The constricted structure utilizes the Venturi effect to accelerate and concentrate the airflow, significantly increasing the wind speed and wind pressure flowing out of the air duct, making the cooling air blown towards the oil tank more powerful, and further improving the heat exchange efficiency.
[0010] Furthermore, in the semi-enclosed vacuum pump oil tank cooling structure described in this utility model, multiple reinforcing ribs extending forward and backward are provided on the inner surfaces of the two sides of the protective cover that are inclined inward. This not only enhances the rigidity and deformation resistance of the constricted section, preventing it from deforming due to stress during injection molding, assembly, or use, but also serves as a guide, making the airflow smoother and more concentrated.
[0011] Furthermore, in the semi-enclosed vacuum pump oil tank cooling structure described in this utility model, a cooling fan is provided on the rear output shaft of the motor. The active cooling fan design enhances the air pressure and flow rate of the cooling air, ensuring that sufficient cooling airflow is forced through the air duct to the oil tank under all operating conditions, resulting in a more stable and significant cooling effect.
[0012] The beneficial effects of this utility model are: This invention creatively places the air outlet of the motor protective cover at the front end and faces the oil tank, and eliminates the air outlet on the side of the original protective cover. This allows the cooling airflow that has completed the heat dissipation of the motor to be directly guided to the surface of the oil tank, achieving forced air cooling of the oil tank. This achieves a synergistic cooling effect of "one airflow for two purposes". At an ambient temperature of 40°C, the surface temperature of the oil tank can be significantly reduced from above 95°C to below 75°C, completely eliminating the risk of burns. Moreover, no additional heat dissipation components need to be added to the oil tank. The powerful heat dissipation function can be achieved simply by changing the shape of the protective cover and its cooperation with the bracket. The structure is extremely simple and adds almost no additional cost. Attached Figure Description
[0013] Figure 1 This is a schematic diagram of the structure of this utility model.
[0014] Figure 2 This is a schematic diagram of the structure of this utility model after part of the protective cover has been removed.
[0015] Figure 3 This is a schematic diagram of the protective shield. Detailed Implementation
[0016] The present invention will now be further described with reference to the accompanying drawings: Reference Figures 1 to 3 As shown in the figure, the semi-enclosed vacuum pump oil tank cooling structure described in this embodiment mainly consists of an oil tank 1, a bracket 2, a motor 3, a protective cover 4, and a cooling fan 6.
[0017] The motor 3 is fixedly mounted behind the oil tank 1 via the bracket 2, and a cooling fan 6 is fixedly mounted on the output shaft at the rear end of the motor 3. The protective cover 4 is fixedly connected to the base of the vacuum pump and covers the motor 3 and the bracket 2. It is made of plastic and has an air inlet 41 on its rear side wall.
[0018] The core improvement of this embodiment lies in the following: after assembly, the upper and lower walls of the protective cover 4 form a tight fit with the corresponding surfaces of the bracket 2, thereby achieving a seal; while the left and right walls have gaps of more than 3mm between them and the bracket 2, thus forming two air outlets 5 facing the oil tank 1 on the left and right sides between the protective cover 4 and the bracket 2. The air outlets on the left and right walls of the original protective cover are eliminated.
[0019] Furthermore, the left and right side walls of the protective cover 4 are inclined inwards, making the front end of the protective cover 4 constricted. This constricted design, based on the Venturi effect, can effectively increase the airflow velocity, making the cooling air blown towards the oil tank 1 more powerful and significantly improving the heat exchange efficiency. To further optimize, multiple reinforcing ribs 42 extending forward and backward are integrally formed on the inner surface of the inwardly inclined left and right side walls (i.e., the constricted section). This not only reinforces the structural weak points of the constricted section of the protective cover 4, ensuring the accuracy and stability of the air outlet 5 design shape, but also optimizes the airflow organization through the guiding effect, effectively dividing and sorting the airflow flowing towards the constriction, making its flow smoother and more concentrated, and significantly reducing turbulence and energy loss.
[0020] Working Principle: When motor 3 is working, it drives cooling fan 6 to rotate at high speed, forcefully drawing in cooling air through air inlet 41 on the rear side of protective cover 4. The cooling airflow passes through motor 3 and the PCB control system, carrying away their heat, and continues to flow forward. Because the upper and lower end walls of protective cover 4 are sealed to the surface of bracket 2, the airflow cannot escape from above or below, but can only pass through air outlets 5 formed between the left and right sides and bracket 2. The constricted design accelerates the airflow. Finally, two concentrated cooling airflows with a certain wind speed are ejected from the air outlets 5, directly and effectively blowing onto the entire side surface of oil tank 1, providing efficient and uniform forced air cooling. When the vacuum pump is running, the temperature of oil tank 1 decreases significantly. At an ambient temperature of 40℃, the temperature of oil tank 1 can be controlled below 75℃, reducing the risk of burns.
[0021] It should be noted that the above description is only a preferred embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural transformations made based on the description and drawings of this utility model, such as setting the gap forming the air outlet 5 between the upper and / or lower end wall of the protective cover 4 and the bracket 2, and sealing the left and / or right side wall with the bracket 2, such simple transformations that form different air outlets by changing the relative position of the sealing and the gap, should also be included within the protection scope of this utility model and are subject to the constraints of the claims of this utility model.
Claims
1. A semi-enclosed vacuum pump oil tank cooling structure, wherein the vacuum pump includes an oil tank, a motor, and a protective cover over the motor, and an air inlet is provided on the rear side of the protective cover, characterized in that, The front end of the protective cover is provided with an air outlet facing the oil tank.
2. The semi-enclosed vacuum pump oil tank cooling structure according to claim 1, characterized in that, The air outlet is formed between the protective cover and a bracket, which is located between the oil tank and the motor.
3. The semi-enclosed vacuum pump oil tank cooling structure according to claim 2, characterized in that, The upper and lower walls of the protective cover are sealed to the bracket, while gaps are left between the left and right walls and the bracket, thus forming two air outlets located on the left and right sides respectively.
4. The semi-enclosed vacuum pump oil tank cooling structure according to claim 3, characterized in that, The width of the gap is 3mm or more.
5. The semi-enclosed vacuum pump oil tank cooling structure according to claim 3, characterized in that, The left and right side walls of the protective cover are inclined inward, making the front end of the protective cover constricted.
6. The semi-enclosed vacuum pump oil tank cooling structure according to claim 5, characterized in that, The inner surfaces of the inwardly inclined side walls of the protective cover are provided with multiple reinforcing ribs extending forward and backward.
7. The semi-enclosed vacuum pump oil tank cooling structure according to claim 1, characterized in that, A cooling fan is installed on the rear output shaft of the motor.