Stator assembly and electronic expansion valve having the same

Abstract

The present invention discloses a stator assembly including: a housing (10) having an accommodation chamber (11) and an accommodation groove (12) on the bottom surface; a stator (20) provided at the bottom of the housing (10), having a hollow structure in the middle, the hollow structure being provided to correspond to the accommodation groove (12); a circuit board (30) provided within the accommodation chamber (11) and electrically connected to the stator (20) by a pin (40); and a sensor (50) provided within the accommodation chamber (11), electrically connected to the stator (20), and positioned on the side of the circuit board away from the stator (20). The present invention also discloses an electronic expansion valve including this stator assembly, thereby solving the problem of the great difficulty in processing electronic expansion valves in the prior art.

Description

[Technical Field]

[0001] This application claims priority to a patent application filed with the State Intellectual Property Office of China on June 29, 2021, bearing application number 202121465503.8 and titled "Stator assembly and electronic expansion valve having the same."

[0002] The present application relates to the technical field of electronic expansion valves, and more particularly to a stator assembly and an electronic expansion valve having the same. [Background technology]

[0003]

[0003] Currently, conventional electronic expansion valves include a permanent magnet, a stator, a circuit board, and a sensor element. Specifically, the sensor element is disposed below the circuit board and electrically connected to the circuit board, and the stator is disposed below the sensor element, with pins on the stator connected to the circuit board. In this configuration, the pins connecting the stator and the circuit board are too long, which makes manufacturing difficult and makes the connection between the stator and the circuit board prone to failure, affecting the normal use of the electronic expansion valve. Summary of the Invention

[0004] The present application provides a stator assembly and an electronic expansion valve having the same, in order to solve the problem of the high difficulty in manufacturing electronic expansion valves in the prior art.

[0005] According to one aspect of the present application, there is provided a stator assembly including: a housing having an accommodating chamber and an accommodating groove on its bottom surface; a stator provided at the bottom of the housing and having a hollow structure in its center, the hollow structure being arranged to correspond to the accommodating groove; a circuit board provided in the accommodating chamber and electrically connected to the stator by a pin; and a sensor provided in the accommodating chamber, electrically connected to the stator, and positioned on the side of the circuit board away from the stator. The above design can effectively shorten the vertical distance between the circuit board and the stator, thereby shortening the length of the pin and improving the stability of the electrical connection between the circuit board and the stator.

[0006] Furthermore, multiple components are mounted on the circuit board, and the sensor and components with a height of more than 1 mm are located on the same side of the circuit board. This arrangement not only facilitates the installation of the sensor and components, but also improves the integration density of the circuit board. It also allows the overall thickness of the circuit board to be made as thin as possible, thereby minimizing the space occupied by the circuit board.

[0007] Furthermore, the sensor is a Hall sensor, which has the advantages of high sensitivity and small volume, which greatly reduces the space required during installation and also makes it easy to receive signals.

[0008] Furthermore, the sensor has a mounting portion on the outside, which is fixedly connected to the circuit board. This arrangement allows the sensor and the circuit board to be indirectly connected, which allows the sensor to receive and feedback signals immediately, making the operation of the device more stable.

[0009] The stator further includes a casing located below the housing, connected to the housing, and corresponding to the receiving groove, a bobbin provided in the casing, and a coil wound around the bobbin and electrically connected to the circuit board by a pin. When the coil is energized, a magnetic field is formed around the stator, and the corresponding assembly is driven to rotate under the action of the magnetic field force, thereby controlling the electronic expansion valve.

[0010] The stator assembly further includes a sealant layer disposed within the chamber, with the circuit board and the sensor located within the sealant layer, thereby sealing the circuit board and the sensor together to prevent damage to the components due to interference from the external environment after installation and to extend the service life of the device.

[0011] Furthermore, the thickness of the sealant layer is less than 8 mm. This design not only benefits the sealing of the circuit board and the sensor, but also reduces the manufacturing cost accordingly.

[0012] Furthermore, the distance between the circuit board and the bottom wall of the housing is 1 mm or less, which further shortens the length of the pins required, making it easier to mount the circuit board and further improving the stability of the mounted circuit board.

[0013] According to another aspect of the present application, there is provided an electronic expansion valve including the above-mentioned stator assembly, further comprising a valve body inserted into the receiving groove and hollow structure of the stator assembly, a permanent magnet rotatably provided within the valve body and corresponding to the hollow structure, a valve core assembly movably provided within the valve body, and a transmission mechanism provided within the valve body, wherein the permanent magnet drives and moves the valve core assembly via the transmission mechanism, so that the opening and closing of the electronic expansion valve can be controlled by the movement of the valve core assembly.

[0014] Furthermore, the sensor at least partially overlaps the permanent magnet in the axial projection direction, which allows the sensor to receive stable signals during operation of the device, making it easier to control the device.

[0015] When the technical aspects of the present application are applied, the sensor is positioned on the side of the circuit board away from the stator, thereby efficiently shortening the vertical distance between the circuit board and the stator, thereby shortening the height of the pin, reducing the difficulty of processing, improving the stability of the connection between the circuit board and the stator, and improving the efficiency of installation. [Brief explanation of the drawings]

[0016] The drawings in the specification that form a part of this application are intended to provide a further understanding of the application, and the schematic examples and descriptions thereof are intended to aid in the interpretation of the application and are not intended to unduly limit the application.

[0017] [Figure 1] 1 shows a schematic diagram of a stator assembly provided by the present application. [Figure 2] 1 shows a schematic diagram of the configuration of an electronic expansion valve provided by the present application.

[0018] Here, the above drawings include the following reference numerals: 10 housing, 11 chamber, 111 bottom wall of chamber, 12 chamber groove, 20 stator, 21 casing, 22 bobbin, 23 coil, 30 circuit board, 40 pin, 50 sensor, 51 mounting portion, 60 valve body, 70 permanent magnet, 80 valve core assembly. DETAILED DESCRIPTION OF THE INVENTION

[0019] The technical aspects of the embodiments of the present application will be described below clearly and completely with reference to the drawings in the embodiments of the present application, but it is clear that the described embodiments are only some of the embodiments of the present application, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is not intended to be any limitation on the present application and its application or use. All other embodiments that can be obtained by a person skilled in the art without creative effort based on the embodiments of the present application fall within the scope of protection of the present application.

[0020] As shown in FIG. 1 , an embodiment of the present application provides a stator assembly including a housing 10, a stator 20, a circuit board 30, and a sensor 50. Here, the housing 10 has an accommodating chamber 11 and an accommodating groove 12 on its bottom surface. The stator 20 is disposed at the bottom of the housing 10 and has a hollow structure corresponding to the accommodating groove 12. The circuit board 30 is disposed in the accommodating chamber 11 and electrically connected to the stator 20 by a pin 40. The sensor 50 is disposed in the accommodating chamber 11 and electrically connected to the stator 20, and is located on the side of the circuit board 30 away from the stator 20. The above design effectively shortens the vertical distance between the circuit board 30 and the stator 20, thereby shortening the length of the pin 40 and improving the stability of the electrical connection between the circuit board 30 and the stator 20.

[0021] According to the technical aspects provided by the present application, the sensor 50 is positioned on the side of the circuit board 30 away from the stator 20, thereby effectively shortening the vertical distance between the circuit board 30 and the stator 20, thereby shortening the height of the pin 40, reducing manufacturing costs and improving installation efficiency.

[0022] Furthermore, multiple components are provided on the circuit board 30, and the sensor 50 and components with a height of more than 1 mm are located on the same side of the circuit board 30. This arrangement not only facilitates the attachment of the sensor 50 and components, but also improves the degree of integration of the circuit board 30. Furthermore, the overall thickness of the circuit board 30 can be made as thin as possible, thereby reducing the space occupied by the circuit board 30.

[0023] Here, the sensor 50 is a Hall sensor. The sensor 50 has the advantages of high sensitivity and small volume, which greatly reduces the space required for installation and also facilitates signal reception.

[0024] Furthermore, a mounting portion 51 is provided on the outside of the sensor, and the mounting portion 51 is fixedly connected to the circuit board 30. The above arrangement allows the sensor 50 to be indirectly connected to the circuit board 30, which allows the sensor 50 to immediately receive and feed back signals, making the operation of the device more stable.

[0025] Specifically, the stator 20 includes a casing 21, a bobbin 22, and a coil 23. Here, the casing 21 is located below the housing 10, connected to the housing 10, and is provided corresponding to and abuttingly connected to the receiving groove 12. The bobbin 22 is provided within the casing 21, and the coil 23 is wound around the bobbin 22 and supported, and is electrically connected to the circuit board 30 by a pin 40. When the coil 23 is energized, a magnetic field is formed around the stator 20, and the corresponding assembly is driven to rotate under the action of the magnetic field force, thereby achieving the effect of controlling the electronic expansion valve.

[0026] Furthermore, the stator assembly further includes a sealant layer disposed within the receiving chamber 11, with the circuit board 30 and the sensor 50 located within the sealant layer. This configuration seals the circuit board 30 and the sensor 50 together, preventing damage to the components due to interference from the external environment after installation and extending the service life of the device.

[0027] In the present embodiment, the circuit board 30 is disposed below the sensor 50, thereby shortening the length of the pins 40 connecting the stator 20 and the circuit board 30, thereby reducing the area of ​​the space formed by the circuit board 30 and the pins 40 and further reducing the thickness of the sealant layer. This design not only reduces the required manufacturing cost, but also simplifies the assembly of the device, improving installation efficiency. In another embodiment, if the stator 20 and the housing 10 are securely sealed, the installation of the sealant layer may be omitted, which further reduces the manufacturing cost and shortens the installation time, improving assembly efficiency.

[0028] Specifically, the thickness of the sealant layer is less than 8 mm. This design not only benefits the sealing of the circuit board 30 and the sensor 50, but also reduces the manufacturing cost accordingly.

[0029] Furthermore, the distance between the circuit board 30 and the bottom wall 111 of the housing chamber is 1 mm or less, which further shortens the length of the pins 40 required, making it easier to mount the circuit board 30 and further improving the stability of the mounted circuit board 30.

[0030] As shown in FIG. 2, another embodiment of the present application provides an electronic expansion valve including the above-mentioned stator assembly. The electronic expansion valve further includes a valve body 60, a permanent magnet 70, a valve core assembly 80, and a transmission mechanism. Here, the valve body 60 is inserted into the receiving groove 12 of the stator assembly and the hollow structure. The permanent magnet 70 is rotatably installed within the valve body 60 and is installed correspondingly to the hollow structure. The valve core assembly 80 is movably installed within the valve body 60. The transmission mechanism is installed within the valve body 60, and the permanent magnet 70 drives and moves the valve core assembly 80 via the transmission mechanism. The movement of the valve core assembly 80 can control the opening and closing of the electronic expansion valve.

[0031] Specifically, the sensor 50 at least partially overlaps the permanent magnet 70 in the axial projection direction. By providing the sensor 50 in this manner, the sensor 50 can stably receive signals during operation of the device, making it easier to control the device.

[0032] According to the technical aspects provided by the present application, by arranging the sensor 50 on the side of the circuit board 30 away from the stator 20, the vertical distance between the circuit board 30 and the stator 20 can be effectively shortened, thereby shortening the length of the pin 40 and improving the stability of the electrical connection between the circuit board 30 and the stator 20, while reducing the area of ​​the space formed by the circuit board 30 and the pin 40 and further reducing the thickness of the sealant layer. The above design not only reduces the required manufacturing cost, but also facilitates the assembly of the device, improving installation efficiency.

[0033] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to the present application. As used herein, the singular also intends to include the plural unless the context clearly dictates otherwise, and it should also be understood that when the terms "comprise" and / or "comprises" are used herein, it means that features, steps, operations, devices, assemblies, and / or combinations thereof are present.

[0034] Unless otherwise specifically stated, the relative arrangements of components and steps, formulas, and numerical values ​​described in these embodiments do not limit the scope of this application. At the same time, it should be understood that, for the sake of convenience, the dimensions of each part shown in the drawings are not drawn to actual proportions. Detailed descriptions of techniques, methods, and equipment already known to those skilled in the art may be omitted, but, where necessary, such techniques, methods, and equipment should be considered part of the approved specification. In all examples shown and described herein, any specific values ​​should be construed as merely illustrative and not limiting. Therefore, other examples of the illustrative embodiments may have different values. It should be noted that similar symbols and characters represent similar objects in the following drawings, so once something is defined in one drawing, there is no need to further describe it in subsequent drawings.

[0035] In the description of this application, orientations or positional relationships expressed by directional terms such as "front, rear, top, bottom, left, right," "lateral, longitudinal, vertical, horizontal," and "top, bottom" are generally based on the orientations or positional relationships shown in the drawings, but this is merely for the ease and simplicity of the description of this application, and unless otherwise stated, these directional terms do not necessarily indicate or imply that the devices or elements shown have a specific orientation or are constructed and operated in a specific orientation, and therefore should not be understood as limiting the scope of protection of this application, and directional terms such as "inside, outside" refer to the inside and outside of the contours of each member itself.

[0036] For convenience of description, spatially relative terms such as "above," "upper," "on top of," "above," etc. may be used herein to describe the spatial location of one device or feature relative to another device or feature, as shown in the figures. It should be understood that spatially relative terms are intended to encompass different orientations during use or operation other than the orientation depicted in the figures of the device. For example, if a device in the figures were turned upside down, a device described as "above other devices or structures" or "on top of other devices or structures" would then be positioned "below other devices or structures" or "below other devices or structures." Thus, the exemplary term "above" can encompass two orientations: "above" and "below." The device can also be oriented in other different ways (rotated 90 degrees or at other orientations) and a corresponding interpretation given to the spatially relative descriptions used herein.

[0037] It should be further explained that the use of terms such as "first" and "second" to define components is merely for distinguishing corresponding components, and unless otherwise specified, the terms do not have any special meaning and should not be understood as limiting the scope of protection of the present application.

[0038] The above is only a preferred embodiment of the present application, and is not intended to limit the present application, and those skilled in the art can make various modifications and variations to the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. a housing (10) having a storage chamber (11) and a storage groove (12) on the bottom surface; a stator (20) provided at the bottom of the housing (10), having a hollow structure in the center, the hollow structure being provided to correspond to the accommodation groove (12); a circuit board (30) provided in the housing (11) and electrically connected to the stator (20) by pins (40), the circuit board (30) having a first surface away from the stator (20) and a second surface opposite to the first surface; a sensor (50) provided in the housing (11), electrically connected to the stator (20), and located on the first surface of the circuit board (30) away from the stator (20); Including, The stator assembly includes a stator (20) disposed entirely on the second surface of the circuit board (30).

2. The stator assembly of claim 1, wherein the circuit board (30) is provided with a plurality of components, and the sensor (50) and the component having a height of more than 1 mm are located on the same side of the circuit board (30).

3. The stator assembly of claim 2, wherein the sensor (50) is a Hall sensor.

4. 3. The stator assembly according to claim 2, wherein the sensor (50) has an outer mounting portion (51) fixedly connected to the circuit board (30).

5. The stator (20) a casing (21) located below the housing (10), connected to the housing (10), and provided corresponding to the receiving groove (12); a bobbin (22) provided in the casing (21); a coil (23) wound around the bobbin (22) and electrically connected to the circuit board (30) by the pin (40); The stator assembly of claim 2 , comprising:

6. The stator assembly of claim 1, further comprising a sealant layer disposed within the chamber (11), the circuit board (30) and the sensor (50) being located within the sealant layer.

7. The stator assembly of claim 6 , wherein the sealant layer has a thickness of less than 8 mm.

8. 2. The stator assembly according to claim 1, wherein the distance between the circuit board (30) and the bottom wall (111) of the chamber is 1 mm or less.

9. An electronic expansion valve including a stator assembly according to any one of claims 1 to 8, a valve body (60) inserted into the receiving groove (12) and hollow structure of the stator assembly; a permanent magnet (70) rotatably provided within the valve body (60) and provided corresponding to the hollow structure; a valve core assembly (80) movably mounted within the valve body (60); a transmission mechanism provided in the valve body (60), the permanent magnet (70) driving the valve core assembly (80) to move through the transmission mechanism; The electronic expansion valve further includes:

Images