Novel electronic oil pump tool and PCBA sealing and heat dissipation solving method thereof

Abstract

The invention provides a novel electronic oil pump tool and a PCBA sealing and heat dissipation solution thereof.The novel electronic oil pump tool comprises an integrated shell, a pump cover is arranged at one end of the integrated shell, the surface of the pump cover is sleeved with a pump head sealing ring and a shell sealing ring, and an outer rotor and an inner rotor are arranged at the end, close to the pump cover, in the integrated shell; a stator core is arranged at the other end in the integrated shell, a hollow shaft is arranged in the middle of the stator core, an electric control cover plate is arranged at the end, away from the pump cover, of the integrated shell, a PCBA is arranged on the side, close to the integrated shell, of the electric control cover plate, a sealing piece is arranged on the surface of the PCBA, and the surface of the sealing piece is sleeved with a cover plate sealing ring. The sealing element is arranged on the surface of the PCBA; according to the invention, the surface of the PCBA facing the wet cavity is partially or completely exposed in the cooling medium instead of being completely sealed, and the sealing surface is additionally arranged on the surface of the PCBA facing the wet cavity, so that other parts of the PCBA are ensured to be still in the area of the dry cavity exposed in the cooling medium on the PCBA.

Description

Technical Field

[0001] This invention belongs to the field of electronic oil pumps, specifically a novel electronic oil pump tooling and its PCBA sealing and heat dissipation solution. Background Technology

[0002] With the rapid development of the automotive industry, electronic oil pumps are widely used in vehicle lubrication and / or cooling systems. These pumps primarily provide power to these systems. An electronic oil pump mainly consists of three main components: a PCBA (motor controller), a motor, and a hydraulic system, along with an external housing. The hydraulic system and motor typically share a common cavity, which is used for cooling and lubrication and can be called the wet cavity. The PCBA is usually sealed in a separate cavity, called the dry cavity. A special assembly connects the dry and wet cavities, sealing both cavities and connecting the PCBA and the electrical components of the motor within both cavities. The electronic oil pump primarily provides power to the vehicle's lubrication and / or cooling systems. Its internal structure typically includes a rotor assembly. During operation, impurities may accumulate on the rotor assembly, affecting the pump's performance. The electronic oil pump also includes an electronic control board assembly, which contains electronic components. During use, the electronic control board assembly may generate electromagnetic radiation.

[0003] Existing electronic oil pumps have a complex structure and use a heat-shrink assembly process to assemble the separate motor stator with the pump body. This heat-shrink assembly process has disadvantages such as high efficiency and scrap rate, poor heat dissipation, and technical problems such as increased energy consumption and reduced motor efficiency due to poor heat dissipation. In the original PCBA dry cavity design, power devices such as MOSFETs could only be placed on the side of the PCBA facing the top cover. The heat generated by these devices during operation had to be dissipated into the air through thermal conduction via a thermal pad or adhesive placed between the device's surface and the top cover of the electronic oil pump. This method resulted in low heat dissipation efficiency, and larger-sized components were required for the MOSFETs and other power devices.

[0004] To achieve direct oil temperature detection, a special pin needs to be added to the isolation component, with one end connected to the PCBA and the other end connected to a special temperature sensor. This solution is complex and has low reliability.

[0005] In summary, this invention provides a novel electronic oil pump tooling and its PCBA sealing and heat dissipation solution to address the aforementioned problems. Summary of the Invention

[0006] To address the aforementioned technical problems, this invention provides a novel electronic oil pump tooling and its PCBA sealing and heat dissipation solution. This solution addresses the issues of complex processes and low reliability associated with existing technologies that require adding specialized pins to the isolation assembly to achieve direct oil temperature detection, with one end connected to the PCBA and the other end to a specialized temperature sensor.

[0007] A novel electronic oil pump fixture includes an integral housing. One end of the integral housing is provided with a pump cover. A pump head sealing ring and a housing sealing ring are fitted on the surface of the pump cover. An outer rotor and an inner rotor are provided inside the integral housing near the pump cover. A stator core is provided inside the integral housing at the other end. A hollow shaft is provided in the middle of the stator core. An electronic control cover plate is provided on the end of the integral housing away from the pump cover. A PCBA is provided on the side of the electronic control cover plate near the integral housing. A sealing element is provided on the surface of the PCBA. A cover plate sealing ring is fitted on the surface of the sealing element. The sealing element is located on the surface of the PCBA.

[0008] Furthermore, the surface of the pump cover is fixedly connected to the surface of the integral shell by multiple self-tapping screws, the pump head sealing ring and the shell sealing ring are located on the pump cover at the end away from the integral shell, and a filter screen is installed inside the pump cover.

[0009] Furthermore, a position sensor is mounted on the surface of the seal, the seal is disposed on the surface of the electronic control cover, and the PCBA is disposed inside the electronic control cover.

[0010] Furthermore, the hollow shaft movably passes through the middle of the rotor core and the integral shell, and is connected to the inner rotor.

[0011] A novel solution for sealing and heat dissipation of the PCBA in an electronic oil pump fixture includes the following steps: Step 1: Place the PCBA at one end near the electrical control cover. Add a seal to the side of the PCBA facing the wet cavity. The seal is sealed around the seal by the cover sealing ring. The seal covers the surface of the PCBA, which is the wet cavity side. Seal one side of the PCBA inside the electrical control cover, which is the dry cavity side, to ensure that the other parts of the PCBA are in the dry cavity. Step 2: During the use of the oil pump, the side of the PCBA near the wet chamber is completely immersed in the coolant of the oil pump for direct cooling. Step 3: Install a thermistor on the PCBA to detect the temperature of the cooling medium.

[0012] Furthermore, the integrated housing is filled with coolant, which is in direct contact with the wet cavity surface of the PCBA.

[0013] Furthermore, the sidewall of the seal is in contact with the inner wall of the electronic control cover, and the seal is in contact with the surface of the PCBA via a pressing block.

[0014] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention changes the side of the PCBA facing the wet cavity from being completely sealed to being partially or completely exposed to the cooling medium. A sealing surface is added to the side of the PCBA facing the wet cavity to ensure that other parts of the PCBA are still in the dry cavity, and the area of ​​the PCBA exposed to the cooling medium.

[0015] 2. This invention improves heat dissipation capacity by directly cooling the PCBA facing the wet cavity side, which can improve the low-temperature start-up characteristics of the oil pump while reducing costs. The temperature of the cooling medium is detected by the thermistor on the PCBA, which greatly improves the detection response, accuracy and reliability, and reduces the cost of medium detection.

[0016] 3. In this invention, the side of the PCBA facing the wet cavity is partially or completely immersed in the coolant of the oil pump. The side of the PCBA facing the wet cavity is sealed with the isolation chamber. The part of the PCBA immersed in the coolant may be completely free of devices, or may be partially equipped with devices that meet the dielectric compatibility requirements (including thermistors, MOS devices, etc.), or the device surface may be coated with a special material to meet the dielectric compatibility requirements. Attached Figure Description

[0017] Figure 1 This is a perspective view of the entire invention; Figure 2 This is an exploded view of the present invention.

[0018] In the picture: 1. Integrated housing; 2. Pump head sealing ring; 3. Housing sealing ring; 4. Self-tapping screw; 5. Pump cover; 6. Inner rotor; 7. Outer rotor; 8. Stator core; 9. Rotor core; 10. Hollow shaft; 11. Position sensor; 12. Cover plate sealing ring; 13. Seal; 14. PCBA; 15. Electrical control cover plate. Detailed Implementation

[0019] The embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of the invention.

[0020] like Figure 1-2As shown, the present invention provides a novel electronic oil pump fixture, including an integral housing 1. One end of the integral housing 1 is provided with a pump cover 5. The surface of the pump cover 5 is fitted with a pump head sealing ring 2 and a housing sealing ring 3. An outer rotor 7 and an inner rotor 6 are provided inside the integral housing 1 near the pump cover 5. The other end of the integral housing 1 is provided with a stator core 8. A hollow shaft 10 is provided in the middle of the stator core 8. An electronic control cover plate 15 is provided on the end of the integral housing 1 away from the pump cover 5. A PCBA 14 is provided on the side of the electronic control cover plate 15 near the integral housing 1. A sealing element 13 is provided on the surface of the PCBA 14. A cover plate sealing ring 12 is fitted on the surface of the sealing element 13. The sealing element 13 is disposed on the surface of the PCBA 14.

[0021] In one embodiment of the present invention, the surface of the pump cover 5 is fixedly connected to the surface of the integral shell 1 by a plurality of self-tapping screws 4, the pump head sealing ring 2 and the shell sealing ring 3 are disposed on the pump cover 5 at one end away from the integral shell 1, and a filter screen is installed inside the pump cover 5.

[0022] In one embodiment of the present invention, a position sensor 11 is mounted on the surface of the sealing member 13, the sealing member is disposed on the surface of the electronic control cover plate 15, and the PCBA 14 is disposed inside the electronic control cover plate 15.

[0023] In one embodiment of the present invention, the hollow shaft 10 movably passes through the middle of the rotor core 9 and the integral shell 1, and is connected to the inner rotor 6.

[0024] A novel solution for sealing and heat dissipation of the PCBA in an electronic oil pump fixture includes the following steps: Step 1: Set PCBA14 at one end near the electrical control cover 15. A sealing element 13 is added to the side of PCBA14 facing the wet cavity. The sealing element 13 is sealed around the cover sealing ring 12. The sealing element 13 covers the surface of PCBA14, which is the wet cavity surface. Seal one side of PCBA14 inside the electrical control cover 15, which is the dry cavity surface, to ensure that the other parts of PCBA14 are in the dry cavity. Step 2: During the use of the oil pump, the side of PCBA14 near the wet chamber is completely immersed in the oil pump's coolant for direct cooling. Step 3: Install a thermistor on PCBA14 to detect the temperature of the cooling medium.

[0025] In one embodiment of the present invention, the integrated shell 1 is filled with coolant, and the coolant is in direct contact with the wet cavity surface of PCBA14.

[0026] In one embodiment of the present invention, the side wall of the sealing member 13 is in contact with the inner wall of the electronic control cover plate 15, and the sealing member 13 is in contact with the surface of the PCBA 14 through the pressing block.

[0027] This invention changes the completely sealed side of PCBA14 facing the wet cavity to partially or completely exposed to the cooling medium. A sealing surface is added to this side of PCBA14 to ensure the rest of PCBA14 remains in the dry cavity. Direct cooling of the area of ​​PCBA14 exposed to the cooling medium improves heat dissipation, enhancing the low-temperature start-up characteristics of the oil pump while reducing costs. Temperature detection of the cooling medium is performed using a thermistor on PCBA14, significantly improving detection response, accuracy, and reliability, and reducing the cost of medium-to-medium temperature detection. The side of PCBA14 facing the wet cavity is partially or completely immersed in the oil pump's coolant. This side of PCBA14 facing the wet cavity is sealed to the isolation chamber. The portion of PCBA14 immersed in the coolant can be completely devoid of components, or contain components that meet media compatibility requirements (including thermistors, MOS devices, etc.), or have their surfaces coated with a special material to meet media compatibility requirements.

[0028] During use, PCBA14 is positioned at the end near the electronic control cover 15. A sealing element 13 is added to the side of PCBA14 facing the wet cavity. The sealing element 13 is sealed around the cover sealing ring 12. The sealing element 13 covers the surface of PCBA14, which is the wet cavity surface. One side of PCBA14 is sealed inside the electronic control cover 15, which is the dry cavity surface, ensuring that the other parts of PCBA14 are in the dry cavity. During the use of the oil pump, the side of PCBA14 near the wet cavity is completely immersed in the coolant of the oil pump for direct cooling. A thermistor is installed on PCBA14 to detect the temperature of the cooling medium. The integrated housing 1 is filled with coolant, which is in direct contact with the wet cavity surface of PCBA14. The side wall of the sealing element 13 is in contact with the inner wall of the electronic control cover 15. The sealing element 13 is in contact with the surface of PCBA14 through the pressure block.

[0029] Finally, it should be noted that in the description of this invention, the terms "vertical," "upper," "lower," "horizontal," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0030] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0031] The above description is merely a preferred embodiment of the present invention; however, the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and its improved concepts, should be covered within the scope of protection of the present invention.

[0032] The embodiments of the present invention are given for the purposes of illustration and description. Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A novel electronic oil pump tooling, comprising an integral housing (1), characterized in that: One end of the integrated shell (1) is provided with a pump cover (5), and the surface of the pump cover (5) is fitted with a pump head sealing ring (2) and a shell sealing ring (3). The inner end of the integrated shell (1) near the pump cover (5) is provided with an outer rotor (7) and an inner rotor (6). The other end of the integrated shell (1) is provided with a stator core (8). The middle part of the stator core (8) is provided with a hollow shaft (10). The end of the integrated shell (1) away from the pump cover (5) is provided with an electrical control cover plate (15). The side of the electrical control cover plate (15) near the integrated shell (1) is provided with a PCBA (14). The surface of the PCBA (14) is provided with a sealing element (13). The surface of the sealing element (13) is fitted with a cover plate sealing ring (12). The sealing element (13) is provided on the surface of the PCBA (14).

2. The novel electronic oil pump tooling as described in claim 1, characterized in that: The surface of the pump cover (5) is fixedly connected to the surface of the integral shell (1) by multiple self-tapping screws (4). The pump head sealing ring (2) and the shell sealing ring (3) are set on the pump cover (5) at one end away from the integral shell (1). A filter screen is installed inside the pump cover (5).

3. The novel electronic oil pump tooling as described in claim 1, characterized in that: A position sensor (11) is mounted on the surface of the seal (13), the seal is disposed on the surface of the electronic control cover plate (15), and the PCBA (14) is disposed inside the electronic control cover plate (15).

4. The novel electronic oil pump tooling as described in claim 1, characterized in that: The hollow shaft (10) extends through the middle of the rotor core (9) and the integral shell (1) and is connected to the inner rotor (6).

5. A solution for sealing and heat dissipation of a PCBA used in the novel electronic oil pump fixture as described in claims 1-4, characterized in that: Includes the following steps: Step 1: Set PCBA (14) at one end close to the electrical control cover (15). Add a seal (13) to the side of PCBA (14) facing the wet cavity. The seal (13) is sealed around the cover sealing ring (12). The seal (13) covers the surface of PCBA (14), which is the wet cavity surface. Seal one side of PCBA (14) inside the electrical control cover (15), which is the dry cavity surface, to ensure that the other parts of PCBA (14) are in the dry cavity. Step 2: During the use of the oil pump, the side of the PCBA (14) near the wet chamber is completely immersed in the coolant of the oil pump for direct cooling; Step 3: Install a thermistor on PCBA (14) to detect the temperature of the cooling medium.

6. The PCBA sealing and heat dissipation solution for the novel electronic oil pump tooling as described in claim 5, characterized in that: The integrated shell (1) is filled with coolant, which is in direct contact with the wet cavity surface of the PCBA (14).

7. The PCBA sealing and heat dissipation solution for the novel electronic oil pump tooling as described in claim 5, characterized in that: The sidewall of the seal (13) is in contact with the inner wall of the electronic control cover (15), and the seal (13) is in contact with the surface of the PCBA (14) through the mortise block.

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