Electric drive structure and valve device with same

Abstract

The utility model relates to an electric driving structure and a valve device with the same. The electric drive structure includes a stator assembly, a rotor assembly, and a seal. The stator assembly is provided with a containing cavity, and one end of the containing cavity is provided with an opening. The rotor assembly is at least partially loaded into the accommodating cavity through the opening of the accommodating cavity. The sealing piece is arranged at the opening end of the containing cavity, and in the process that the rotor assembly is installed in the containing cavity, the sealing piece makes sliding contact with the outer wall of the rotor assembly so as to seal the containing cavity when the rotor assembly is installed to the preset position. The rotor assembly further comprises an exhaust part, the exhaust part is arranged on the outer wall of the rotor assembly, and in the process that the rotor assembly is installed in the containing cavity, the exhaust part is matched with the sealing piece, so that a gap for gas circulation is formed between the outer wall of the rotor assembly and the sealing piece. And the gas in the accommodating cavity can be exhausted through the gap, so that the air pressure in the accommodating cavity can be reduced, and the rotor assembly can be smoothly mounted at a preset position.

Description

Technical Field

[0001] This disclosure relates to the field of fluid control, and in particular to an electrically driven structure and a valve device having therein. Background Technology

[0002] Valve devices are commonly used in equipment or systems with fluid control requirements, such as vehicle thermal management systems. As a type of valve device, the electronic expansion valve in a vehicle thermal management system is used to regulate refrigerant flow for temperature control. Some valve devices include an electrically driven structure, which comprises a stator assembly and a rotor assembly. The stator assembly has a receiving cavity into which the rotor assembly can be installed. To prevent external contaminants from entering the receiving cavity and causing malfunctions in the electrically driven structure, the inner diameter of the receiving cavity needs to be very close to the outer diameter of the rotor assembly, and the receiving cavity needs to be sealed after the rotor assembly is installed.

[0003] However, in traditional electric drive structures, when the rotor assembly is installed into the housing cavity, the fit between the seal and the housing cavity creates a dead space, making it difficult to install the rotor assembly in place. Utility Model Content

[0004] In view of this, the present disclosure provides an electric drive structure aimed at solving the problem that when the rotor assembly is installed into the receiving cavity, a dead cavity is formed due to the fit between the seal and the receiving cavity, making it difficult to install the rotor assembly in place.

[0005] The electric drive structure disclosed herein includes a stator assembly, a rotor assembly, and a seal. The stator assembly has a receiving cavity with an opening at one end. The rotor assembly is at least partially inserted into the receiving cavity through the opening. The seal is located at the open end of the receiving cavity and slides against the outer wall of the rotor assembly during insertion to seal the receiving cavity when the rotor assembly is installed in a predetermined position. The rotor assembly also includes an exhaust portion located on the outer wall of the rotor assembly. During insertion, the exhaust portion cooperates with the seal to form a gap between the outer wall of the rotor assembly and the seal for gas flow. When the rotor assembly is installed in the predetermined position, the exhaust portion separates from the seal to eliminate the gap and seal the receiving cavity.

[0006] During the installation of the rotor assembly into the receiving cavity, the gas in the cavity can be discharged through the gap between the outer wall of the rotor assembly and the seal. This helps to reduce the gas pressure in the receiving cavity, allowing the rotor assembly to be smoothly installed in the predetermined position. Furthermore, the receiving cavity is sealed when the rotor assembly is installed in the predetermined position, preventing external contaminants from entering the gap between the outer wall of the rotor assembly and the seal and affecting the working environment of the rotor assembly. Therefore, this implementation ensures the performance of the electric drive structure.

[0007] The electrically driven structure is suitable for valve devices, which include an electrically driven structure and a valve body. In one possible implementation, the electrically driven structure further includes a connector for connecting the valve body. The connector is fixed to a stator assembly, which is connected to the valve body via the connector. The stator assembly has a mounting recess that is recessed radially outward from a receiving cavity, and the mounting recess opens to the bottom of the stator assembly. The inner periphery of the connector protrudes radially inward beyond the side of the mounting recess to partially close the bottom of the mounting recess, thereby mounting a seal within the mounting recess.

[0008] According to the above implementation, the connector can both connect the stator assembly to the valve body and block the seal from the bottom of the mounting recess, making it less likely for the seal to accidentally come out of the mounting recess and enhancing the reliability of the seal's connection with the stator assembly. One component performs multiple functions, which helps improve the structural compactness of the electric drive structure.

[0009] In one possible implementation, the exhaust section is a protrusion that extends out of the outer wall of the rotor assembly.

[0010] During the insertion of the rotor assembly into the receiving cavity, the protrusion supports the inner edge of the seal, creating a gap between the seal and the outer wall of the rotor assembly. This allows gas in the receiving cavity to escape through the gap between the outer wall of the rotor assembly and the seal. Once the rotor assembly is installed in the predetermined position, the seal separates from the protrusion, and the inner edge of the seal contacts the outer wall of the rotor assembly, eliminating the gap and thus sealing the receiving cavity.

[0011] In one possible implementation, the protrusion is integrally formed with the outer wall of the rotor assembly.

[0012] A one-piece design reduces the number of connection points between components, thus improving the overall strength of the structure. Furthermore, by reducing the number of connection steps between components, this approach also reduces the complexity of the manufacturing process.

[0013] In one possible implementation, the protrusion is an attachment that is attached to the outer wall of the rotor assembly.

[0014] By constructing the protrusions as attachments on the outer wall of the rotor assembly, this implementation method can reduce the complexity of the manufacturing process compared to a one-piece implementation.

[0015] In one possible implementation, the adhesive is an adhesive strip pasted on the outer wall of the rotor assembly; or, the adhesive is a cured coating applied to the outer wall of the rotor assembly.

[0016] Using adhesive strips or coatings can effectively reduce production costs.

[0017] In one possible implementation, the exhaust portion is a recess formed on the outer wall of the rotor assembly.

[0018] During the insertion of the rotor assembly into the receiving cavity, a gap is formed between the seal and the bottom surface of the recess, allowing gas in the receiving cavity to escape through this gap. Once the rotor assembly is installed in the predetermined position, the seal separates from the recess, and the inner edge of the seal contacts the outer wall of the rotor assembly, thereby sealing the receiving cavity. Furthermore, constructing the exhaust portion as a recess helps prevent interference between the outer wall of the rotor assembly and the inner circumferential surface of the receiving cavity. Additionally, constructing the exhaust portion as a recess reduces friction between the recess and the seal during rotor assembly installation, making the installation process easier and reducing the risk of damaging the seal.

[0019] In one possible implementation, the exhaust section is in the form of an elongated strip, extending in a straight line or curve along the axial direction of the rotor assembly.

[0020] Because the exhaust section extends along the axial direction of the rotor assembly, the gas in the housing can be continuously discharged during the process of installing the rotor assembly into the housing, which makes the installation process of the rotor assembly relatively smooth.

[0021] In one possible implementation, along the axial direction of the rotor assembly, the distance from the seal to the top of the rotor assembly is D1, the distance from the exhaust portion to the top of the rotor assembly is D2, and the distance from the seal to the exhaust portion is D3, wherein D2 / D1≤1 / 5, and / or, D3 / D1≤1 / 5.

[0022] Based on the aforementioned numerical range, the exhaust section, when the rotor assembly is installed into the receiving cavity, can engage with the seal earlier, allowing gas in the receiving cavity to escape through the gap between the outer wall of the rotor assembly and the seal. This helps to reduce the gas pressure in the receiving cavity earlier, making the installation of the front section of the rotor assembly easier. On the other hand, after the exhaust section separates from the seal, as the rotor assembly continues to be installed to the predetermined position, the receiving cavity can be sealed quickly, thus preventing a sharp increase in gas pressure within the receiving cavity. This makes the installation of the rear section of the rotor assembly easier.

[0023] On the other hand, this disclosure also provides a valve device including the above-described electrically driven structure. Attached Figure Description

[0024] To more clearly illustrate the technical solutions of the embodiments of this disclosure, the accompanying drawings used in the embodiments will be briefly described below.

[0025] It should be understood that the following figures only illustrate certain embodiments of this disclosure and should not be construed as limiting the scope.

[0026] It should also be understood that the same or similar reference numerals are used in the accompanying drawings to denote the same or similar elements.

[0027] It should also be understood that the accompanying drawings are only schematic, and the dimensions and scales of the elements in the drawings are not necessarily precise.

[0028] Figure 1 This is a schematic diagram of the valve device according to the first embodiment of the present disclosure.

[0029] Figure 2 yes Figure 1 An exploded view of the valve device.

[0030] Figure 3 It is along Figure 1 A schematic cross-sectional view taken along line AA.

[0031] Figure 4 yes Figure 3 Enlarged view of section C.

[0032] Figure 5 yes Figure 2 A schematic diagram of the structure of the outer wall and seals of the rotor assembly.

[0033] Figure 6 It is along Figure 5 A schematic cross-sectional view taken from the DD line.

[0034] Figure 7 This is a schematic diagram of the structure of the outer wall and seal of the rotor assembly according to the second embodiment of this disclosure.

[0035] Figure 8 It is along Figure 7 A schematic cross-sectional view taken from the EE line.

[0036] Figure 9 This is a schematic diagram of the structure of the outer wall of the rotor assembly according to the third embodiment of this disclosure.

[0037] Figure 10 This is a schematic diagram of the structure of the outer wall of the rotor assembly according to the fourth embodiment of this disclosure.

[0038] Figure 11 This is a schematic diagram of the structure of the outer wall of the rotor assembly according to the fifth embodiment of this disclosure. Detailed Implementation

[0039] The embodiments of this disclosure are described below with reference to the accompanying drawings. It should be understood that there are many ways to implement this disclosure, and it should not be construed as being limited to the embodiments set forth herein. The embodiments set forth herein are only for a more thorough and clear understanding of this disclosure.

[0040] Figure 1 and Figure 2 Valve assembly 1000 is shown, see [link / reference] Figure 1 and Figure 2 The valve device 1000 includes an electrically driven structure 100 and a valve body 200. The electrically driven structure 100 includes a stator assembly 10 and a rotor assembly 20. The stator assembly 10 includes a stator housing 11 and a stator 12. The stator housing 11, alone or together with the stator 12, forms a receiving cavity 13, one end of which is... Figure 2 The lower end of the rotor assembly 20 has an opening 131. The rotor assembly 20 can be inserted into the receiving cavity 13 through the opening 131, such that the rotor assembly 20 is surrounded by the stator 12.

[0041] The stator 12 may include stator coils. When energized, the stator coils generate a rotating magnetic field. When this rotating magnetic field acts on the rotor assembly 20, the rotor assembly 20 is driven to rotate about axis BB. An electric drive structure 100 is connected to the valve body 200, which contains a valve core. The rotation of the rotor assembly 20 drives the valve core to rotate, thereby changing the flow path. For example, the valve core may consist of one or more valve plates.

[0042] After the rotor assembly 20 is installed into the receiving cavity 13, in order to ensure that the working environment of the rotor assembly 20 is not affected by the external environment, the valve device 1000 is also provided with a sealing element 30 to seal the receiving cavity 13. The sealing element 30 is located at the open end of the receiving cavity 13. During the process of installing the rotor assembly 20 into the receiving cavity 13, the sealing element 30 slides in contact with the outer wall 21 of the rotor assembly, and seals the receiving cavity 13 when the rotor assembly 20 is installed in the predetermined position.

[0043] When the receiving cavity 13 has an opening 131 at only one end, as the rotor assembly 20 is inserted into the receiving cavity 13, the gas in the receiving cavity 13 will be compressed, causing the gas pressure inside the receiving cavity 13 to rise. Due to the pressure difference between the inside and outside of the receiving cavity 13, the operator will feel resistance when inserting the rotor assembly 20. When the pressure difference between the inside and outside of the receiving cavity 13 is too large, the rotor assembly 20 may not be able to be installed smoothly into the intended position.

[0044] In view of the above, based on the embodiments provided in this disclosure, and referring to Figures 1 to 3The rotor assembly 20 includes an exhaust section 22 disposed on the outer wall 21 of the rotor assembly. During the process of installing the rotor assembly 20 into the receiving cavity 13, the exhaust section 22 cooperates with the seal 30 to form a gap between the outer wall 21 of the rotor assembly and the seal 30 for gas flow. When the rotor assembly 20 is installed in the predetermined position, the exhaust section 22 separates from the seal 30 to eliminate the gap and seal the receiving cavity 13. During the process of installing the rotor assembly 20 into the receiving cavity 13, the gas in the receiving cavity 13 can be discharged through the gap between the outer wall 21 of the rotor assembly and the seal 30, which helps to reduce the gas pressure in the receiving cavity 13, thereby allowing the rotor assembly 20 to be smoothly installed in the predetermined position. In addition, the sealing of the receiving cavity 13 when the rotor assembly 20 is installed in the predetermined position can prevent external contaminants from entering the gap between the outer wall 21 of the rotor assembly and the seal 30 and affecting the working environment of the rotor assembly 20. Therefore, this implementation can ensure the performance of the electric drive structure 100.

[0045] refer to Figure 5 and Figure 6 The exhaust portion 22 can be configured as a protrusion 22a extending from the outer wall 21 of the rotor assembly. During the insertion of the rotor assembly 20 into the receiving cavity 13, the protrusion 22a supports the inner edge of the seal 30, forming a gap between the seal 30 and the outer wall 21 of the rotor assembly. This allows gas in the receiving cavity 13 to be discharged through the gap between the outer wall 21 of the rotor assembly and the seal 30. When the rotor assembly 20 is installed in the predetermined position, the seal 30 separates from the protrusion, and the inner edge of the seal 30 contacts the outer wall 21 of the rotor assembly, eliminating the gap and thus sealing the receiving cavity 13.

[0046] As one possible implementation, the protrusion 22a can be integrally formed with the outer wall 21 of the rotor assembly. This integral design reduces the number of connection points between components, improving the overall structural strength. Furthermore, by reducing the number of connection steps between components, this implementation also reduces the complexity of the manufacturing process.

[0047] As another possible implementation, the protrusion 22a can be an attachment that is attached to the outer wall 21 of the rotor assembly. Constructing the protrusion 22a as an attachment on the outer wall 21 of the rotor assembly reduces the complexity of the manufacturing process compared to an integrally formed implementation.

[0048] It is understood that there are many ways to implement the attachment, and this disclosure does not impose any particular limitation on it. As an example, the attachment can be an adhesive strip pasted on the outer wall of the rotor assembly, or, for example, a cured coating applied to the outer wall of the rotor assembly. Using adhesive strips or coatings can effectively reduce production costs.

[0049] refer to Figure 7 and Figure 8 The exhaust portion 22 can be a recess 22b formed on the outer wall 21 of the rotor assembly. During the insertion of the rotor assembly 20 into the receiving cavity 13, the seal 30 and the bottom surface of the recess 22b are spaced apart to form a gap, allowing gas in the receiving cavity 13 to be discharged through this gap. When the rotor assembly 20 is installed in the predetermined position, the seal 30 separates from the recess 22b, and the inner edge of the seal 30 contacts the outer wall 21 of the rotor assembly 20, thereby sealing the receiving cavity 13. Furthermore, constructing the exhaust portion 22 as a recess 22b helps to avoid interference between the outer wall of the rotor assembly 20 and the inner circumferential surface of the receiving cavity 13. In addition, constructing the exhaust portion 22 as a recess 22b can also reduce the friction between the recess 22b and the seal 30 during the installation of the rotor assembly 20, thereby making the installation process easier and reducing the risk of damage to the seal 30.

[0050] It is understandable that the shape of the exhaust section 22 can be implemented in various ways, see reference. Figure 5 and Figure 7 Whether constructed as a convex or concave portion, the exhaust portion 22 can be elongated and extend linearly along the axial direction of the rotor assembly 20. As another example, see reference... Figure 9 The exhaust section 22 can also extend in a curved manner along the axial direction of the rotor assembly 20. When the exhaust section 22 extends along the axial direction of the rotor assembly 20, the gas in the receiving cavity 13 can be continuously discharged during the process of installing the rotor assembly 20 into the receiving cavity 13, which makes the installation process of the rotor assembly 20 smoother.

[0051] Furthermore, when the exhaust section 22 extends in a curved manner along the axial direction of the rotor assembly 20, the curve can be a spiral around the outer wall 21 of the rotor assembly 20, or it can be a wavy or curved curve. Of course, the curve can also have both of the above characteristics at the same time, and this disclosure does not impose any particular limitation on this.

[0052] It should be noted that, in this disclosure, the orientation description "axial" can refer to the direction of extension of axis BB. Correspondingly, the orientation description "radial" can refer to the direction of extension of a straight line passing through axis BB in a radial plane (i.e., a plane perpendicular to axis BB).

[0053] refer to Figure 2 and Figure 6Along the axial direction of the rotor assembly 20, the distance from the seal 30 to the top of the rotor assembly 20 (i.e., the top of the outer wall 21 of the rotor assembly) is D1, the distance from the exhaust part 22 to the top of the rotor assembly 20 is D2, and the distance from the seal 30 to the exhaust part 22 is D3. D2 and D1 can satisfy: D2 / D1≤1 / 5, and D3 and D1 can satisfy: D3 / D1≤1 / 5.

[0054] If D2 / D1 is too large, the rotor assembly 20 needs to extend a considerable distance into the receiving cavity 13 before the exhaust section 22 can engage with the seal 30. As the rotor assembly 20 is inserted into the receiving cavity 13, the gas in the cavity 13 is compressed, causing the gas pressure inside the cavity 13 to rise, which is detrimental to the insertion of the rotor assembly 20. With the exhaust section 22 configured according to the aforementioned numerical range, it can engage with the seal 30 earlier when the rotor assembly 20 is inserted into the receiving cavity 13. This allows the gas in the receiving cavity 13 to be discharged through the gap between the outer wall 21 of the rotor assembly and the seal 30, which helps to reduce the gas pressure in the receiving cavity 13 earlier, making the initial insertion of the rotor assembly 20 easier.

[0055] If D3 / D1 is too large, the rotor assembly 20 will need to extend a considerable distance after the exhaust section 22 separates from the seal 30 to be properly installed. At this point, the seal 30 will be in contact with the outer wall 21 of the rotor assembly, and the receiving cavity 13 will be sealed. As the rotor assembly 20 is installed into the receiving cavity 13, the gas in the cavity is compressed, causing the pressure inside the cavity to rise, which is detrimental to the installation of the rotor assembly 20. With the exhaust section 22 configured according to the above numerical range, the receiving cavity 13 can be sealed more quickly during the process of installing the rotor assembly 20 to the predetermined position after the exhaust section 22 separates from the seal 30. Therefore, the pressure in the receiving cavity 13 will not rise sharply, making the subsequent installation of the rotor assembly 20 easier.

[0056] It should be noted that D2 can refer to the distance from the end of the exhaust section 22 near the rotor assembly 20 to the top of the rotor assembly 20, and D3 can refer to the distance from the midpoint of the seal 30 to the end of the exhaust section 22 near the seal 30.

[0057] The above are merely illustrative examples of some embodiments of this disclosure. It is understood that there are various implementations of this disclosure, and it is not limited to the embodiments described above. As an example, see reference [link to relevant documentation]. Figure 10 It can be discontinuous. As another example, see [reference needed]. Figure 11 It is possible to turn back.

[0058] After the electric drive structure 100 is installed, it needs to be connected to the valve body 200. As one possible implementation, the electric drive structure 100 can be connected to the valve body 200 via a connector. (See reference) Figures 2 to 4 The electric drive structure 100 may further include a connector 40, which is fixed to the stator assembly 10. The stator assembly 10 is connected to the valve body 200 via the connector 40. The stator assembly 10 has a mounting recess 14 that is recessed radially outward from the receiving cavity 13. The mounting recess 14 is open to the bottom of the stator assembly 10. The inner periphery of the connector 40 protrudes radially inward beyond the side 141 of the mounting recess 14 to partially close the bottom of the mounting recess 14, so that the seal 30 is installed in the mounting recess 14. According to the above implementation, the connector 40 can both connect the stator assembly 10 to the valve body 200 and block the seal 30 from the bottom of the mounting recess 14, making it less likely for the seal 30 to accidentally fall out of the mounting recess and enhancing the reliability of the connection between the seal 30 and the stator assembly 10. One component performs multiple functions, which helps to reduce the number of components and improve the structural compactness of the electric drive structure 100.

[0059] To connect the stator assembly 10 and the valve body 200, the connector 40 needs to be connected to both the stator assembly 10 and the valve body 200. There are various connection methods, and this disclosure does not limit the specific method. As an example, refer to... Figure 2 The connector 40 may have a plurality of axially spaced limiting holes 41, and the stator assembly 10 has downwardly extending positioning protrusions 15, each positioning protrusion 15 being able to be installed in a corresponding limiting hole 41 to fix the stator assembly 10 to the connector 40. The connector 40 may also have a pair of radially outwardly extending ears 42, each ear 42 having a mounting hole 43. Through the engagement of the mounting hole 43 with a bolt, the connector 40 can be fixed to the valve body 200. Of course, in some possible embodiments, the ears 42 may also be welded to the valve body 200.

[0060] It should be understood that the term "comprising" and its variations as used in this disclosure are open-ended, meaning "including but not limited to". The term "according to" means "at least in part according to". The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least another embodiment".

[0061] The scope of protection of this disclosure is not limited to the above embodiments. Any variations or substitutions that can be conceived by those skilled in the art within the scope of the technology disclosed in this disclosure should be included within the scope of protection of this disclosure. Therefore, the scope of protection of this disclosure should be determined by the scope of the claims.

Claims

1. An electrically driven structure, comprising: A stator assembly having a receiving cavity, one end of which has an opening; A rotor assembly, which is at least partially inserted into the receiving cavity through an opening in the receiving cavity; A sealing element, disposed at the open end of the receiving cavity, slides in contact with the outer wall of the rotor assembly during the process of installing the rotor assembly into the receiving cavity, so as to seal the receiving cavity when the rotor assembly is installed in a predetermined position, characterized in that the rotor assembly further comprises: An exhaust section is disposed on the outer wall of the rotor assembly. During the process of installing the rotor assembly into the receiving cavity, the exhaust section cooperates with the seal to form a gap for gas flow between the outer wall of the rotor assembly and the seal. When the rotor assembly is installed in the predetermined position, the exhaust section separates from the seal to eliminate the gap and seal the receiving cavity.

2. The electric drive structure according to claim 1, characterized in that, The electric drive structure is applicable to a valve device, which includes the electric drive structure and a valve body. The electric drive structure also includes a connector for connecting the valve body. The connector is fixed to the stator assembly, and the stator assembly is connected to the valve body through the connector. The stator assembly has a mounting recess that is recessed radially outward from the receiving cavity. The mounting recess is open to the bottom of the stator assembly. The inner periphery of the connector protrudes radially inward beyond the side of the mounting recess to partially close the bottom of the mounting recess, so that the seal is installed in the mounting recess.

3. The electric drive structure according to claim 1, characterized in that, The exhaust portion is a protrusion protruding from the outer wall of the rotor assembly; during the process of installing the rotor assembly into the receiving cavity, the protrusion supports the seal to form the gap between the seal and the outer wall of the rotor assembly.

4. The electric drive structure according to claim 3, characterized in that, The protrusion is integrally formed with the outer wall of the rotor assembly.

5. The electric drive structure according to claim 3, characterized in that, The protrusion is an attachment that is attached to the outer wall of the rotor assembly.

6. The electric drive structure according to claim 5, characterized in that, The adhesive is an adhesive strip pasted on the outer wall of the rotor assembly; or, the adhesive is a cured coating applied to the outer wall of the rotor assembly.

7. The electric drive structure according to claim 1, characterized in that, The exhaust portion is a recess formed on the outer wall of the rotor assembly; during the process of installing the rotor assembly into the receiving cavity, the seal is spaced apart from the bottom surface of the recess to form the gap.

8. The electric drive structure according to any one of claims 1 to 7, characterized in that, The exhaust section is elongated and extends in a straight line or curve along the axial direction of the rotor assembly.

9. The electric drive structure according to claim 8, characterized in that, Along the axial direction of the rotor assembly, the distance from the seal to the top of the rotor assembly is D1, the distance from the exhaust portion to the top of the rotor assembly is D2, and the distance from the seal to the exhaust portion is D3, wherein D2 / D1≤1 / 5, and / or, D3 / D1≤1 / 5.

10. A valve device, characterized in that, Includes the electric drive structure according to any one of claims 1 to 9.

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