Electromagnetic drive unit and relay

Abstract

The present disclosure provides an electromagnetic drive unit and a relay. The electromagnetic drive unit includes a frame (4), a coil (5), a fixed adsorption member, and a movable adsorption member. The coil (5) is wound around the frame (4). The frame (4) is provided with an inner hole (41). The movable adsorption member is disposed in the inner hole (41). The fixed adsorption member is disposed at one end of the inner hole (41) and faces the movable adsorption member. Taking a plane perpendicular to the axial direction of the inner hole (41) as a projection plane, the orthographic projection area of the movable adsorption member on the projection plane is the first projection area, and the orthographic projection area of the fixed adsorption member on the projection plane is the second projection area. The second projection area is larger than the first projection area. In the present disclosure, since the fixed adsorption member can effectively absorb the leakage magnetic flux in the magnetic circuit, the electromagnetic attraction force of the electromagnetic drive unit is increased.

Description

Technical Field

[0001] The present disclosure relates to the technical field of relay manufacturing, and particularly to electromagnetic drive units and relays.

Background Art

[0002] A relay is an electronic control element that has a control system (also called an input circuit) and a controlled system (also called an output circuit), and is usually applied to an automatic control circuit, where it plays roles such as automatic adjustment, safety protection, and conversion circuit in the circuit. With the expansion of the usage scenarios of relays, existing high-voltage DC relays generally require features such as strong electromagnetic attraction force, low driving power, and miniaturization. A common method in this field to improve the electromagnetic attraction force is to increase the coil winding space and coil driving force of the magnetic circuit part of the relay, but this goes against the requirements of low driving power and miniaturization of the relay. Therefore, under the requirements of low driving power and miniaturization, how to improve the electromagnetic attraction force of the relay has become one of the urgent problems in this field.

Summary of the Invention

Problems to be Solved by the Invention

[0003] Therefore, in response to the above problems, the present disclosure proposes an electromagnetic drive unit having an optimized structure, and also proposes a relay based on the electromagnetic drive unit.

Means for Solving the Problems

[0004] According to one aspect of the present disclosure, there is provided an electromagnetic drive unit including a frame, a coil, a fixed adsorption member, and a movable adsorption member. The coil is wound around the frame, the frame is provided with an inner hole, the movable adsorption member is disposed in the inner hole, and the fixed adsorption member is disposed at one end of the inner hole and faces the movable adsorption member. Taking a plane perpendicular to the axial direction of the inner hole as a projection plane, the orthographic projection area of the movable adsorption member on the projection plane is a first projection area, the orthographic projection area of the fixed adsorption member on the projection plane is a second projection area, and the second projection area is larger than the first projection area.

[0005] According to one embodiment of the present disclosure, the fixed adsorption member includes a fixed iron core, and the fixed iron core has a radially expanding portion whose radial dimension is larger than that of the movable adsorption member, or the fixed adsorption member includes a fixed iron core and a magnetic ring sleeved on the outer periphery of the fixed iron core.

[0006] According to one embodiment of the present disclosure, the fixed adsorption member includes a fixed iron core and a magnetic ring sleeved on the outer periphery of the fixed iron core, and the orthographic projection area of the fixed iron core on the projection plane is the same as the first projection area of the movable adsorption member.

[0007] According to one embodiment of the present disclosure, it further includes a straight yoke plate, a U-shaped yoke, and a magnetic cylinder. The yoke plate and the U-shaped yoke are fixedly connected to form a frame surrounding the coil. The magnetic cylinder is fixedly connected to the U-shaped yoke and extends toward the yoke plate. The length of the magnetic cylinder extending toward the yoke plate is smaller than the height of the U-shaped yoke, forming a space between the magnetic cylinder and the yoke plate. The magnetic cylinder is sleeved on the outer periphery of the movable adsorption member, and the radially expanding portion or the magnetic ring is disposed in the space.

[0008] According to one embodiment of the present disclosure, the fixed iron core is an independent component, and the fixed iron core is fixedly connected to the yoke plate, or the fixed iron core and the yoke plate are integrally formed.

[0009] According to an embodiment of the present disclosure, the radial expansion portion has a tapered structure or a stepped structure that contracts in a direction toward the movable adsorption member or in a direction away from the movable adsorption member.

[0010] According to an embodiment of the present disclosure, the magnetic ring has a tapered structure or a stepped structure that contracts in a direction toward the movable adsorption member or in a direction away from the movable adsorption member.

[0011] According to an embodiment of the present disclosure, it further includes a sealing cylinder used to seal and cover the movable adsorption member. The sealing cylinder has a flange at the cylinder opening, and the flange is in contact with and fixed to the yoke plate. The sealing cylinder is provided with a radial expansion section for accommodating the radial expansion portion or the magnetic ring.

[0012] According to an embodiment of the present disclosure, it further includes a sealing cylinder used to seal and cover the movable adsorption member. The sealing cylinder has a flange at the cylinder opening, and the sealing cylinder is a straight circular cylinder with the same diameter for each cross-section in the axial direction. The flange is in contact with and fixed to the radial expansion portion.

[0013] According to an embodiment of the present disclosure, it further includes a sealing cylinder used to seal and cover the movable adsorption member. The sealing cylinder has a flange at the cylinder opening, and the sealing cylinder is a straight circular cylinder with the same diameter for each cross-section in the axial direction. The flange is in contact with and fixed to the yoke plate, and the magnetic ring is sleeved and fixed on the sealing cylinder.

[0014] According to an embodiment of the present disclosure, the movable adsorption member has a cylindrical structure with the same diameter for each cross-section in the axial direction.

[0015] According to another aspect of the present disclosure, a relay includes a contact portion for realizing a switching function and an electromagnetic drive unit for driving the contact portion of the relay to perform a switching operation. The electromagnetic drive unit is the electromagnetic drive unit described in the present disclosure.

[0016] The present disclosure has the following beneficial effects. That is, since the area of the orthographic projection of the fixed adsorption member on the projection plane perpendicular to the axial direction of the inner hole of the frame is larger than the area of the orthographic projection of the movable adsorption member on the projection plane perpendicular to the axial direction of the inner hole of the frame, the fixed adsorption member can effectively absorb the leakage magnetic flux in the magnetic circuit and increase the electromagnetic attraction force of the electromagnetic drive unit.

Brief Description of the Drawings

[0017] The above and other features and advantages of the present invention will become more apparent by describing its exemplary embodiments in detail with reference to the drawings.

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Figure 12

Figure 13

Best Mode for Carrying Out the Invention

[0018] Next, with reference to the drawings, exemplary embodiments will be described in more detail. However, the exemplary embodiments can be implemented in various forms and should not be understood as being limited to the embodiments described herein. In this specification, relative terms such as "upper" and "lower" are used to describe the relative relationship between one component shown in the drawings and other components. These terms are used in this specification only for convenience, for example, in accordance with the exemplary directions shown in the drawings. It will be understood that if the device shown in the drawings is turned upside down, the component described as "upper" will become the "lower" component. Other relative terms such as "top" and "bottom" have the same meaning. When a structure is "above" another structure, it may mean that the structure is integrally formed on the other structure, or that the structure is "directly" disposed on the other structure, or that the structure is "indirectly" disposed on the other structure via another structure.

[0019] The terms "one", "a", "said", and "the" are used to indicate the presence of one or more elements / components, etc. The terms "comprising" and "having" are used to indicate open inclusion and mean that there may be additional elements / components, etc. in addition to the listed elements / components, etc. The terms "first", "second", etc. are used only as markers and are not used as quantitative limitations on the object.

[0020] Example 1: The electromagnetic drive unit, also called the magnetic circuit part when applied to a relay, drives the contact part of the relay to perform a switching operation and is used to realize the switching function of the relay.

[0021] Referring to FIGS. 1-3, the electromagnetic drive unit includes a yoke plate 1, a U-shaped yoke 2, a magnetic cylinder 3, a frame 4, a coil 5, a sealing cylinder 6, a fixed adsorption member and a movable adsorption member. In this embodiment, the fixed adsorption member is a fixed iron core 7, and the movable adsorption member is a movable iron core 8. The coil 5 is wound around the frame 4, and the frame 4 is provided with an inner hole 41. The movable iron core 8 is slidably disposed in the inner hole 41, the fixed iron core 7 is fixedly disposed at one end of the inner hole 41 and faces the movable iron core 8. When an electric current flows through the coil 5, the fixed iron core 7 generates an electromagnetic attraction force on the movable iron core 8, and the movable iron core 8 moves toward the fixed iron core 7, resulting in an operating action. Further, a reaction spring (not shown) for applying an elastic force to reset the movable iron core 8 is provided between the fixed iron core 7 and the movable iron core 8. The sealing cylinder 6 is used to hermetically cover the movable iron core 8.

[0022] The yoke plate 1 and the U-shaped yoke 2 are fixedly connected to form a frame-shaped magnetic yoke, surrounding the periphery of the coil 5 to close the magnetic lines of force generated by the coil 5 and enhance the electromagnetic attraction force. The magnetic cylinder 3 is fixed to the U-shaped yoke 2 and extends toward the yoke plate 1. The frame 4 is sleeved on the outer periphery of the magnetic cylinder 3, and the magnetic cylinder 3 is annularly sleeved on the outer periphery of the movable iron core 8, that is, the movable iron core 8 is also slidably disposed in the inner hole of the magnetic cylinder 3, enabling further transmission of the magnetic lines of force through the magnetic cylinder 3. Here, the length of the magnetic cylinder 3 extending toward the yoke plate 1 (i.e., the height of the magnetic cylinder 3) is smaller than the height of the U-shaped yoke 2. Since the height of the magnetic cylinder 3 is between 1 / 2 and 4 / 5 of the height of the U-shaped yoke 2, it is preferable that a space P is formed between the magnetic cylinder 3 and the yoke plate 1.

[0023] In this embodiment, the movable iron core 8 has a cylindrical structure with the same diameter in each axial cross-section. The fixed iron core 7 has a radially expanding portion 71 with a larger radial dimension than the radial dimension of the movable iron core 8. The orthographic projection area (the second projection area) of the fixed iron core 7 on the projection plane perpendicular to the inner hole 41 is larger than the orthographic projection area (the first projection area) of the movable iron core 8 on the projection plane perpendicular to the axial direction of the inner hole 41. Since the radially expanding portion 71 increases the diameter of the fixed iron core 7, it can effectively absorb the leakage magnetic flux in the magnetic circuit and increase the electromagnetic attraction force of the electromagnetic driving unit.

[0024] Also, in this embodiment, the radially expanding portion 71 is located in the space P between the magnetic cylinder 3 and the yoke plate 1, and can further absorb the leakage magnetic flux caused by the high magnetic resistance of the space P, reducing the magnetic flux loss. Moreover, the radially expanding portion 71 only effectively utilizes the space P between the magnetic cylinder 3 and the yoke plate 1. Based on reducing the magnetic flux loss, it does not increase the volume of the entire electromagnetic driving unit, realizing the design concept of killing two birds with one stone.

[0025] In this embodiment, the radially expanding portion 71 is a cylindrical structure that uniformly expands in the radial direction of the fixed iron core 7 to increase the radial dimension of the fixed iron core 7. In other embodiments, as long as the second projection area of the fixed iron core 7 on the projection plane perpendicular to the axial direction of the inner hole 41 is larger than the first projection area of the movable iron core 8 on the projection plane perpendicular to the axial direction of the inner hole 41, the radially expanding portion 71 may be irregular and non-uniform.

[0026] In this embodiment, the sealing cylinder 6 has a flange 62 at the cylinder opening. This flange 62 is in contact with the yoke plate 1 and welded. In order to accommodate the radially expanding portion 71, the sealing cylinder 6 is further provided with a radially expanding section 61, thereby making the electromagnetic driving unit more compact.

[0027] This embodiment improves the structure of the fixed iron core 7 to effectively utilize the internal space of the electromagnetic driving unit, and while maintaining the requirements of low power consumption and miniaturization of the electromagnetic driving unit, improves the electromagnetic attraction force.

[0028] The electromagnetic drive unit provided in this embodiment can be applied to a relay and can also be applied to other electronic components such as a solenoid valve that needs to convert electromagnetic energy into mechanical energy.

[0029] Example 2: Referring to FIG. 4, the electromagnetic drive unit provided in this embodiment is basically the same as that in Embodiment 1 and has the same technical effects with the same structure. The difference is that in Embodiment 1, the fixed iron core 7 and the yoke plate 1 are two independent parts, and the fixed iron core 7 is fixedly assembled to the yoke plate 1, while in this embodiment, the fixed iron core 7A and the yoke plate 1A have an integral structure, and the fixed iron core 7A is formed to protrude outward from the lower surface of the yoke plate 1A. According to this embodiment, the assembly process of the fixed iron core 7A and the yoke plate 1A can be omitted, and the cost can be reduced.

[0030] Example 3: Referring to FIG. 5, the electromagnetic drive unit provided in this embodiment is basically the same as that in Embodiment 1 and has the same technical effects with the same structure. The difference is that in this embodiment, the radially expanding portion 71B of the fixed iron core has a tapered structure that shrinks toward the direction of the movable iron core 8B. According to this embodiment, it can absorb leakage magnetic flux and reduce the material usage amount of the fixed iron core, thereby reducing the cost.

[0031] Example 4: Referring to FIG. 6, the electromagnetic drive unit provided in this embodiment is basically the same as that in Embodiment 3 and has the same technical effects with the same structure. The difference is that in this embodiment, the fixed iron core 7C is integrally formed with the yoke plate 1C. According to this embodiment, the assembly process of the fixed iron core 7C and the yoke plate 1C can be omitted, and the cost can be reduced.

[0032] Example 5: Referring to Fig. 7, the electromagnetic drive unit provided in this embodiment is basically the same as that in Embodiment 1 and has the same technical effects with the same structure. The difference is that in this embodiment, the radially expanding portion 71D of the fixed core has a tapered structure that shrinks in a direction away from the movable core 8D. According to this embodiment, it is possible to absorb leakage magnetic flux and reduce the material usage amount of the fixed core, thereby reducing the cost.

[0033] Embodiment 6: Referring to Fig. 8, the electromagnetic drive unit provided in this embodiment is basically the same as that in Embodiment 1 and has the same technical effects with the same structure. The difference is that in this embodiment, the radially expanding portion 71E of the fixed core has a stepped structure that shrinks in the direction of the movable core 8E. According to this embodiment, it is possible to absorb leakage magnetic flux and reduce the material usage amount of the fixed core, thereby reducing the cost.

[0034] Embodiment 7: Referring to Fig. 9, the electromagnetic drive unit provided in this embodiment is basically the same as that in Embodiment 1 and has the same technical effects with the same structure. The difference is that in this embodiment, the radially expanding portion 71F of the fixed core is a stepped structure that shrinks in a direction away from the movable core 8F. According to this embodiment, it is possible to absorb leakage magnetic flux and reduce the material usage amount of the fixed core, thereby reducing the cost.

[0035] Embodiment 8: Referring to FIG. 10, the electromagnetic drive unit provided in this embodiment is basically the same as that in Embodiment 1 and has the same technical effects with the same structure. The difference is that in this embodiment, the fixed adsorption member includes two parts, namely a fixed iron core 7G and a magnetic ring 9. The radial dimensions of the fixed iron core 7G and the movable iron core 8G are equal. The magnetic ring 9 is sleeved and fixed on the outer periphery of the fixed iron core 7G. The sum of the orthographic projection areas of the fixed iron core 7G and the magnetic ring 9 on the projection plane perpendicular to the axial direction of the inner hole of the frame (i.e., the second projection area of the fixed adsorption member) is larger than the first projection area of the movable iron core 8G on the projection plane perpendicular to the axial direction of the inner hole of the frame. The magnetic ring 9 can effectively absorb more leakage magnetic flux, reduce the magnetic flux loss, and thereby increase the electromagnetic attraction force.

[0036] In this embodiment, since the magnetic ring 9 is sleeved and fixed on the outer periphery of the fixed iron core 7G, the assembly and installation of the fixed adsorption member become more flexible and the applicability is improved. In this embodiment, since the radial dimensions of the fixed iron core 7G and the movable iron core 8G are equal, the manufacturing and installation are facilitated. In other embodiments, as long as the sum of the orthographic projection areas of the fixed iron core 7G and the magnetic ring 9 (the second projection area) on the projection plane perpendicular to the axial direction of the inner hole of the frame is larger than the orthographic projection area (the first projection area) of the movable iron core 8G on the projection plane perpendicular to the axial direction of the inner hole of the frame, the radial dimension of the fixed iron core 7G may be slightly smaller than the radial dimension of the movable iron core 8G. Similarly, the magnetic ring 9 only effectively utilizes the space P between the magnetic cylinder 3 and the yoke plate 1G, reduces the magnetic flux loss, and does not increase the volume of the entire electromagnetic drive unit.

[0037] In Embodiment 8, the sealing cylinder 6G is a straight circular cylinder with the same diameter for each axial cross-section. The flange 62G at the cylinder opening of the sealing cylinder 6G is in contact with and fixed to the yoke plate 1G. The magnetic ring 9 is sleeved and fixed on the sealing cylinder 6G, and thus is sleeved on the outer periphery of the fixed iron core 7G. The sealing cylinder 6G in this embodiment has a simpler structure, is easier to manufacture and install, and has a lower cost.

[0038] Embodiment 9: Referring to Fig. 11, the electromagnetic drive unit provided in this embodiment is basically the same as that in Embodiment 8 and has the same technical effects with the same structure. The difference is that in this embodiment, the magnetic ring 9H has a tapered structure that shrinks towards the movable iron core 8H. According to this embodiment, it can absorb leakage magnetic flux and reduce the material usage amount of the fixed iron core, thereby reducing costs.

[0039] In other embodiments, the magnetic ring may have a tapered structure similar to the radial expansion portion of Embodiment 5, or may have a stepped structure similar to the radial expansion portions of Embodiments 6 and 7.

[0040] Embodiment 10: Referring to Fig. 12, the electromagnetic drive unit provided in this embodiment is basically the same as that in Embodiment 8 and has the same technical effects with the same structure. The difference is that in Embodiment 8, the magnetic ring 9 is sleeved and fixed on the sealing cylinder 6G, while in this embodiment, the magnetic ring 9M is sleeved and fixed on the fixed iron core 7M, and on the sealing cylinder 6M, a radial expansion section 61M similar to the radial expansion section 61 of the sealing cylinder 6 in Embodiment 1 is provided to accommodate the magnetic ring 9M.

[0041] Embodiment 11: Referring to Fig. 13, the electromagnetic drive unit provided in this embodiment is basically the same as that in Embodiment 1 and has the same technical effects with the same structure. The difference is that in this embodiment, the sealing cylinder 6N is a straight circular cylinder with the same diameter in each axial cross-section, and the flange 62N at the cylinder opening of the sealing cylinder 6N is in contact with the radial expansion portion 71N of the fixed iron core 7N. The sealing cylinder 6N in this embodiment has a simpler structure, is easier to manufacture and install, and has a lower cost.

[0042] Embodiment 12: This embodiment provides a relay including a contact portion for realizing a switching function and an electromagnetic drive unit (or a magnetic circuit portion) for driving the contact portion of the relay to perform a switching operation. The electromagnetic drive unit is any of the electromagnetic drive units in the above Embodiments 1 to 11 and has the same technical effect of the corresponding structure.

[0043] It should be understood that in its application, the present disclosure is not limited to the detailed structure and arrangement of the components described in this specification. The present disclosure allows other embodiments and can be implemented and carried out in various ways. The foregoing modifications and variations are included within the scope of the present disclosure. It will be understood that the present disclosure as disclosed and limited in this specification extends to all alternative combinations of two or more distinct features mentioned or apparent in the text and / or drawings. All such different combinations constitute multiple alternative aspects of the present disclosure. The embodiments described in this specification illustrate the best-known mode for carrying out the invention and are provided to enable those skilled in the art to utilize the invention.

[0044] The present disclosure claims the priority of the Chinese patent application with the application number 202210818439.X filed on July 13, 2022, and the entire content thereof is incorporated herein by reference.

Claims

1. It includes a frame, a coil, a fixed adsorption member, and a movable adsorption member. The coil is wound around the frame. The frame is provided with an inner hole. The movable adsorption member is disposed in the inner hole. The fixed adsorption member is an electromagnetic drive unit disposed at one end of the inner hole and facing the movable adsorption member, Taking a plane perpendicular to the axial direction of the inner hole as the projection plane, the orthographic projection area of the movable adsorption member on the projection plane is the first projection area, the orthographic projection area of the fixed adsorption member on the projection plane is the second projection area, and the electromagnetic drive unit is characterized in that the second projection area is larger than the first projection area.

2. The fixed adsorption member includes a fixed iron core. The fixed iron core has a radially expanding portion whose radial dimension is larger than the radial dimension of the movable adsorption member, or the fixed adsorption member includes a fixed iron core and a magnetic ring sleeved on the outer periphery of the fixed iron core. The electromagnetic drive unit according to claim 1, characterized in that.

3. The fixed adsorption member includes a fixed iron core and a magnetic ring sleeved on the outer periphery of the fixed iron core. The electromagnetic drive unit according to claim 1, characterized in that the orthographic projection area of the fixed iron core on the projection plane is the same as the first projection area of the movable adsorption member.

4. It further includes a straight yoke plate, a U-shaped yoke, and a magnetic cylinder. The yoke plate and the U-shaped yoke are fixedly connected to form a frame surrounding the coil. The magnetic cylinder is fixedly connected to the U-shaped yoke and extends toward the yoke plate. The length of the magnetic cylinder extending toward the yoke plate is smaller than the height of the U-shaped yoke, forming a space between the magnetic cylinder and the yoke plate. The magnetic cylinder is sleeved on the outer periphery of the movable adsorption member, and the radially expanding portion or the magnetic ring is disposed in the space. The electromagnetic drive unit according to claim 2, characterized in that.

5. The fixed iron core is an independent component. The electromagnetic drive unit according to claim 4, characterized in that the fixed iron core is fixedly connected to the yoke plate, or the fixed iron core and the yoke plate are integrally formed.

6. The radially expanding portion is a tapered structure or a stepped structure that shrinks in the direction toward the movable adsorption member or in the direction away from the movable adsorption member. The electromagnetic drive unit according to claim 2, characterized in that.

7. The electromagnetic drive unit according to claim 2, wherein the magnetic ring has a tapered structure or a stepped structure that contracts in a direction toward the movable adsorption member or in a direction away from the movable adsorption member.

8. The electromagnetic drive unit according to claim 4, further comprising a sealing cylinder used for hermetically covering the movable adsorption member, the sealing cylinder having a flange at its cylinder opening, the flange being in contact with and fixed to the yoke plate, and the sealing cylinder being provided with a radially expanding section for accommodating the radially expanding portion or the magnetic ring.

9. The electromagnetic drive unit according to claim 4, further comprising a sealing cylinder used for hermetically covering the movable adsorption member, the sealing cylinder having a flange at its cylinder opening, the sealing cylinder being a straight circular cylinder with equal diameters in each axial cross-section, and the flange being in contact with and fixed to the radially expanding portion.

10. The electromagnetic drive unit according to claim 4, further comprising a sealing cylinder used for hermetically covering the movable adsorption member, the sealing cylinder having a flange at its cylinder opening, the sealing cylinder being a straight circular cylinder with equal diameters in each axial cross-section, the flange being in contact with and fixed to the yoke plate, and the magnetic ring being sleeved and fixed on the sealing cylinder.

11. The electromagnetic drive unit according to claim 1, wherein the movable adsorption member has a cylindrical structure with equal diameters in each axial cross-section.

12. A relay comprising a contact portion for realizing a switching function and an electromagnetic drive unit for driving the contact portion of the relay to perform a switching operation, wherein the electromagnetic drive unit is the electromagnetic drive unit according to any one of claims 1 to 11.

Images