Relay rear cover

Abstract

The utility model belongs to the technical field of low-voltage electric appliances, and discloses a relay rear cover, which comprises a cover body and a shielding piece, and is characterized in that the cover body covers the rear end of a thermal overload relay in a sealing manner, and an avoiding hole allowing a lead to penetrate out is formed in the cover body; the shielding piece comprises a shielding part and a first auxiliary part, the first end of the shielding part is connected with the cover body and arranged above the receding hole, the second end of the shielding part extends in the direction away from the cover body, the first side of the shielding part is connected with the first auxiliary part, and the first auxiliary part extends towards the side away from the shielding part and is matched with the shielding part to form a shielding space. The projection of the second side of the shielding part on the projection surface is tangent to the avoiding hole, and when the thermal overload relay is matched with the contactor, the second side of the shielding part is used for abutting against the side wall of a corresponding isolation rib on the contactor. The rear cover of the relay can completely shield a lead exposed between the thermal overload relay and the contactor and avoid interference with an isolation rib.

Description

Technical Field

[0001] This utility model relates to the field of low-voltage electrical technology, and in particular to a relay back cover. Background Technology

[0002] A thermal overload relay is a protection device based on the principle of current thermal effect. It mainly utilizes the thermal expansion characteristics of a bimetallic strip to detect current overload. When the current exceeds a set value, the bimetallic strip bends due to heat, triggering the contacts to actuate and cut off the circuit, thereby protecting the motor or other equipment. In order to achieve complete circuit protection, a thermal overload relay needs to be used in conjunction with a contactor.

[0003] When a thermal overload relay is used in conjunction with a contactor, and a wire extends from the thermal overload relay to mate with the contactor's wiring, the exposed wire between the thermal overload relay and the wiring needs to be shielded. However, since there are insulating ribs on the end faces where the contactor and thermal overload relay mate, if the shielding tube is too long, although it can completely shield the exposed wire, it will cause interference between the shielding tube and the insulating rib. If the shielding tube is too short, it cannot completely shield the exposed wire. Utility Model Content

[0004] The purpose of this utility model is to provide a relay back cover that can completely shield the exposed wires between the thermal overload relay and the contactor, and avoid interference with the isolation ribs.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] A relay rear cover is disposed on a thermal overload relay, the thermal overload relay cooperating with a contactor, the relay rear cover comprising:

[0007] A cover is provided on the rear end of the thermal overload relay, and the cover is provided with a clearance hole that allows wires to pass through.

[0008] The shielding component includes a shielding portion and a first auxiliary portion. The first end of the shielding portion is connected to the cover and is disposed above the clearance hole. The second end of the shielding portion extends away from the cover. The first side of the shielding portion is connected to the first auxiliary portion. The first auxiliary portion extends away from the shielding portion and cooperates with the shielding portion to form a shielding space. The projection of the second side of the shielding portion on the projection plane is tangent to the clearance hole. When the thermal overload relay cooperates with the contactor, the second side of the shielding portion is used to abut against the side wall of the corresponding isolation rib on the contactor.

[0009] As a further technical solution, along the length direction of the shielding member, the cross-sectional shape of the side wall of the first auxiliary part near the avoidance hole is arc-shaped.

[0010] As a further technical solution, the radius of the arc is equal to the radius of the clearance hole, and the center of the arc coincides with the center of the clearance hole.

[0011] As a further technical solution, the shielding member also includes a second auxiliary part, which is connected to the side of the first auxiliary part away from the shielding part, and the second auxiliary part extends along the direction from the first side to the second side of the shielding part.

[0012] As a further technical solution, the projection of the side of the second auxiliary part away from the first auxiliary part on the projection plane is tangent to the avoidance hole.

[0013] As a further technical solution, both the second auxiliary part and the shielding part are parallel to the projection surface.

[0014] As a further technical solution, the end face of the second end of the shielding member is set to be flush.

[0015] As a further technical solution, the relay back cover also includes a wiring sleeve, which is disposed on the cover body corresponding to the clearance hole, and the clearance hole penetrates the wiring sleeve to form a clearance channel. The first end of the shielding member is connected to the cover body through the wiring sleeve.

[0016] As a further technical solution, the end face of the wiring sleeve facing away from the cover is set to be flush with the cover.

[0017] As a further technical solution, the cover is integrally formed with the wiring sleeve and the shielding component.

[0018] Compared with the prior art, the relay back cover provided by this utility model has the following technical advantages:

[0019] Because a shielding element is provided on the cover corresponding to the clearance hole, the shielding part and the first auxiliary part of the shielding element cooperate to form a shielding space, and the shielding part is located above the clearance hole. The projection of the second side of the shielding part on the projection plane is tangent to the clearance hole. Therefore, when the thermal overload relay and the contactor are in operation, since the shielding element is located on the cover corresponding to the clearance hole, when the wire extends out of the clearance hole, the exposed wire between the thermal overload relay and the contactor is within the shielding space, ensuring that the shielding element completely shields the exposed wire between the thermal overload relay and the contactor. At the same time, since the projection of the second side of the shielding part on the projection plane is tangent to the clearance hole, when the second side of the shielding part abuts against the side wall of the corresponding isolation rib on the contactor, it ensures that the shielding element completely shields the wire while avoiding interference between the shielding element and the isolation rib on the contactor. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of the relay back cover and the contactor in accordance with an embodiment of the present invention;

[0021] Figure 2 yes Figure 1 A magnified view of a section at point A in the middle;

[0022] Figure 3 This is a front view of a first example of a relay back cover provided in this embodiment of the present utility model;

[0023] Figure 4 yes Figure 3 A magnified view of a section at point B in the middle;

[0024] Figure 5 This is a schematic diagram of the structure of a first example of a relay back cover provided in this embodiment of the present utility model;

[0025] Figure 6 yes Figure 5 A magnified view of a section at point C;

[0026] Figure 7 This is a front view of a second example of a relay back cover provided in this embodiment of the present utility model;

[0027] Figure 8 This is a schematic diagram of the structure of a second example of a relay back cover provided in this embodiment of the present utility model;

[0028] Figure 9 This is a disassembly diagram of the relay back cover and the universal mold provided in this embodiment of the utility model.

[0029] In the picture:

[0030] 10. Thermal overload relay; 20. Contactor; 21. Isolating rib; 30. Projected surface;

[0031] 100. Cover body; 110. Clearance hole;

[0032] 200, shielding component; 210, shielding part; 220, first auxiliary part; 230, second auxiliary part;

[0033] 300. Wiring socket;

[0034] 410. First general-purpose mold; 420. Second general-purpose mold; 430. Support general-purpose mold; 440. Replacement core. Detailed Implementation

[0035] Before explaining any implementation of this application in detail, it should be understood that this application is not limited to its application to the structural details and component arrangements set forth in the following description or shown in the above drawings.

[0036] In this application, the terms "comprising," "including," "having," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0037] In this application, the term "and / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent three cases: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this application generally indicates that the preceding and following related objects have an "and / or" relationship.

[0038] In this application, the terms "connection," "combination," "coupling," and "installation" can refer to direct connection, combination, coupling, or installation, or indirect connection, combination, coupling, or installation. For example, a direct connection refers to two parts or components being connected together without the need for an intermediary, while an indirect connection refers to two parts or components each being connected to at least one intermediary, with the connection achieved through the intermediary. Furthermore, "connection" and "coupling" are not limited to physical or mechanical connections or couplings, but can also include electrical connections or couplings.

[0039] In this application, those skilled in the art will understand that relative terms (e.g., “about,” “approximately,” “basically,” etc.) used in conjunction with quantities or conditions are to include the values ​​and have the meaning indicated by the context. For example, such relative terms include at least the degree of error associated with the measurement of a particular value, tolerances associated with the particular value due to manufacturing, assembly, use, etc. Such terms should also be considered as disclosing a range defined by the absolute values ​​of the two endpoints. Relative terms may refer to a certain percentage (e.g., 1%, 5%, 10% or more) of the indicated value. Numerical values ​​not using relative terms should also be disclosed as specific values ​​with tolerances. Furthermore, “basically” when expressing relative angular relationships (e.g., substantially parallel, substantially perpendicular) may refer to a certain degree (e.g., 1 degree, 5 degrees, 10 degrees or more) added to or subtracted from the indicated angle.

[0040] In this application, those skilled in the art will understand that the function performed by a component can be performed by one component, multiple components, one part, or multiple parts. Similarly, the function performed by a part can also be performed by one part, one component, or a combination of multiple parts.

[0041] In this application, the directional terms "upper," "lower," "left," "right," "front," and "rear" are used to describe the orientation and positional relationships shown in the accompanying drawings and should not be construed as limiting the embodiments of this application. Furthermore, in the context, it should be understood that when an element is mentioned as being connected "upper" or "lower" to another element, it can be directly connected to the other element "upper" or "lower," or indirectly connected through an intermediate element. It should also be understood that directional terms such as upper side, lower side, left side, right side, front side, and rear side not only represent positive orientation but can also be understood as lateral orientation. For example, "below" can include directly below, lower left, lower right, lower front, and lower rear.

[0042] Combination Figures 1 to 6 As shown, the relay back cover provided in this embodiment is disposed on the thermal overload relay 10. The thermal overload relay 10 is used to cooperate with the contactor 20. The relay back cover can completely shield the exposed wires between the thermal overload relay 10 and the contactor 20 and avoid interference with the isolation rib 21.

[0043] Because multiple wiring points are spaced apart along the width direction of the contactor 20, and each wiring point is correspondingly provided with an isolation rib 21; therefore, multiple clearance holes 110 are spaced apart along the width direction of the cover 100 corresponding to the multiple wiring points, and each clearance hole 110 is correspondingly provided with a shielding member 200. When the thermal overload relay 10 cooperates with the contactor 20, the second side of each shielding part 210 abuts against the side wall of the corresponding isolation rib 21, so as to completely shield the exposed wires between the thermal overload relay 10 and the contactor 20. For ease of explanation, this embodiment will be described using one clearance hole 110 and the shielding member 200 corresponding to the clearance hole 110 as an example.

[0044] Specifically, the relay rear cover includes a cover body 100 and a shielding member 200. The cover body 100 is closed and covered at the rear end of the thermal overload relay 10. The cover body 100 is provided with a clearance hole 110 that allows wires to pass through. The shielding member 200 includes a shielding part 210 and a first auxiliary part 220. The first end of the shielding part 210 is connected to the cover body 100 and is located above the clearance hole 110. The second end of the shielding part 210 extends away from the cover body 100. The first side of the shielding part 210 is connected to the first auxiliary part 220. The first auxiliary part 220 extends away from the shielding part 210 and cooperates with the shielding part 210 to form a shielding space. The projection of the second side of the shielding part 210 on the projection plane 30 is tangent to the clearance hole 110. When the thermal overload relay 10 cooperates with the contactor 20, the second side of the shielding part 210 is used to abut against the side wall of the corresponding isolation rib 21 on the contactor 20.

[0045] Combination Figure 1 and Figure 2 As shown, since a shielding member 200 is provided on the cover 100 corresponding to the clearance hole 110, the shielding part 210 and the first auxiliary part 220 in the shielding member 200 cooperate to form a shielding space, and the shielding part 210 is provided above the clearance hole 110. The projection of the second side of the shielding part 210 on the projection surface 30 is tangent to the clearance hole 110. Therefore, when the thermal overload relay 10 and the contactor 20 are engaged, since the shielding member 200 is provided on the cover 100 corresponding to the clearance hole 110, after the wire extends out from the clearance hole 110, the exposed wire between the thermal overload relay 10 and the contactor 20 is in the shielding space, so as to ensure that the shielding member 200 completely shields the exposed wire between the thermal overload relay 10 and the contactor 20; at the same time, since the projection of the second side of the shielding part 210 on the projection plane 30 is tangent to the clearance hole 110, when the second side of the shielding part 210 abuts against the side wall of the corresponding isolation rib 21 on the contactor 20, it ensures that the shielding member 200 completely shields the wire while avoiding interference between the shielding member 200 and the isolation rib 21 on the contactor 20.

[0046] Since the cross-section of the conductor along its length is circular, after the conductor extends from the clearance hole 110 and is located in the shielding space, in order to prevent the first auxiliary part 220 from squeezing the conductor near the side wall of the clearance hole 110, in this embodiment, the cross-sectional shape of the first auxiliary part 220 near the side wall of the clearance hole 110 along the length of the shielding member 200 is set to be arc-shaped corresponding to the conductor; that is, the first auxiliary part 220 is set as an arc-shaped plate. In some other embodiments, when the cross-section of the conductor along its length is rectangular, the first auxiliary part 220 can be set as a flat plate.

[0047] Furthermore, combining Figure 4 As shown, the radius of the arc is equal to the radius of the clearance hole 110, and the center of the arc coincides with the center of the clearance hole 110. This design avoids steps between the sidewall of the first auxiliary part 220 and the wall of the clearance hole 110, ensuring that the wire extends smoothly from the clearance hole 110 and remains within the shielding space while minimizing the volume of the shielding space. With the cooperation of the shielding part 210, the first auxiliary part 220, and the corresponding isolation rib 21, the relative position of the wire within the shielding space is restricted, preventing displacement or bending of the wire within the shielding space. The radius of the arc and the radius of the clearance hole 110 are adaptively set according to the specifications of the wire; no specific limitation is made in this embodiment.

[0048] Preferably, the shielding member 200 further includes a second auxiliary part 230, which is connected to the side of the first auxiliary part 220 opposite to the shielding part 210, and extends along the direction from the first side to the second side of the shielding part 210. By providing the second auxiliary part 230, the relative position of the wires in the shielding space is restricted from below, preventing the wires from detaching from the shielding space from below, thus avoiding affecting the cooperation between the thermal overload relay 10 and the contactor 20.

[0049] Furthermore, the projection of the side of the second auxiliary part 230 away from the first auxiliary part 220 onto the projection plane 30 is tangent to the clearance hole 110.

[0050] Combination Figure 2 and Figure 4 As shown, with this configuration, when the thermal overload relay 10 cooperates with the contactor 20, the side of the second auxiliary part 230 away from the first auxiliary part 220 and the second side of the shielding part 210 both abut against the side wall of the corresponding isolation rib 21 on the contactor 20, thereby forming a closed space in the shielding space, which further enhances the shielding effect and limiting effect on the wires in the shielding space.

[0051] Furthermore, in this embodiment, both the second auxiliary part 230 and the shielding part 210 are parallel to the projection plane 30. That is, along the length of the shielding member 200, the rounded corner of the side wall of the first auxiliary part 220 near the clearance hole 110 is 180°, and the cross-sectional shape of the shielding member 200 along its length is U-shaped. This arrangement avoids the situation where the distance between the side of the second auxiliary part 230 away from the first auxiliary part 220 and the second side of the shielding part 210 is greater than the diameter of the clearance hole 110, which would cause the wire to shift or bend in this area; at the same time, it avoids the situation where the distance between the side of the second auxiliary part 230 away from the first auxiliary part 220 and the second side of the shielding part 210 is less than the diameter of the clearance hole 110, which would cause the second auxiliary part 230 and the first auxiliary part 220 to squeeze the wire, thus affecting the cooperation effect between the thermal overload relay 10 and the contactor 20. In some other embodiments, depending on the actual situation of the conductor, the second auxiliary part 230 or the shielding part 210 is set at an angle to the projection surface 30, and the angle between the second auxiliary part 230 and the shielding part 210 can be set as an acute angle or an obtuse angle.

[0052] Preferably, the end face of the second end of the shielding member 200 is set to be flush. When the thermal overload relay 10 and the contactor 20 are engaged, it ensures that all parts of the second end of the shielding member 200 abut against the corresponding side wall on the contactor 20, so as to avoid gaps between the second end of the shielding member 200 and the contactor, which would affect the shielding effect on the wire.

[0053] Preferably, the relay rear cover further includes a wiring sleeve 300, which is correspondingly disposed on the cover body 100 with the clearance hole 110, and the clearance hole 110 penetrates the wiring sleeve 300 to form a clearance channel, that is, the wiring sleeve 300 is cylindrical; the first end of the shielding member 200 is connected to the cover body 100 through the wiring sleeve 300. By setting the wiring sleeve 300, with the cooperation of the clearance channel, the wiring process is simplified, and the wires can be fixed and connected without welding or other methods, ensuring the stability of the wire connection, and protecting the wires in this area, avoiding mechanical damage to the wires in this area during installation and use.

[0054] Combination Figure 2As shown, when the first end of the shielding member 200 is connected to the cover 100 via the wiring sleeve 300, the projections of the second side of the shielding part 210 and the side of the second auxiliary part 230 away from the first auxiliary part 220 on the projection plane 30 are both tangent to the clearance hole 110. Since the wiring sleeve 300 is cylindrical, a stepped structure is formed between the shielding member 200 and the end of the wiring sleeve 300 away from the cover 100. Therefore, when the thermal overload relay 10 cooperates with the contactor 20, the stepped structure formed by the cooperation of the shielding member 200 and the wiring sleeve 300 abuts against the end face of the corresponding isolating rib 21 away from the contactor 20, restricting the relative position of the contactor 20 and the thermal overload relay 10 while ensuring the shielding effect on the wires.

[0055] In some other embodiments, the wiring sleeve 300 may not be provided. Instead, the shielding member 200 and the clearance hole 110 may be directly provided on the cover 100, and then the wires may be fixed and connected by means of wiring terminals, wire clamps, etc.

[0056] Preferably, the end face of the terminal block 300 facing away from the cover 100 is made flush with the cover 100. This ensures that the end face of the terminal block 300 facing away from the cover 100 is in contact with the end face of the corresponding isolation rib 21 facing away from the contactor 20 at all points, thus avoiding gaps between the end face of the terminal block 300 facing away from the cover 100 and the isolation rib 21, which would affect the shielding effect on the wires.

[0057] Preferably, in this embodiment, the cover 100, the wiring sleeve 300, and the shielding member 200 are integrally formed, reducing the processing difficulty of the relay back cover while ensuring the overall strength of the relay back cover. In other embodiments, the cover 100, the wiring sleeve 300, and the shielding member 200 can be formed separately and then connected by welding, bonding, or other methods.

[0058] There are generally two types of existing thermal overload relays 10. The only difference between the two types of thermal overload relays 10 is the position of the wire exit on the rear cover of the relay, that is, the position of the clearance hole 110 on the cover 100 is different. Correspondingly, the setting position of the shielding member 200 is different, such as... Figures 3 to 6 As the first example, Figure 7 and Figure 8 This is a second example; the above embodiments use the first example for illustration.

[0059] Since the only differences between the two types of relay back covers are the positions of the clearance hole 110 and the placement of the shielding member 200, in order to reduce the mold development cost of the relay back cover, this embodiment also provides a universal mold structure for the relay back cover, specifically:

[0060] The universal mold structure includes a first universal mold 410, a second universal mold 420, multiple supporting universal molds 430, and two types of replacement cores 440. Taking the production of the relay back cover of the first example as an example, the multiple supporting universal molds 430 are placed in the first universal mold 410 to support the relay back cover to be produced; the replacement core 440 corresponding to the relay back cover of the first example is placed in the second universal mold 420 to block the outgoing wire hole on the second universal mold 420 that does not correspond to the relay back cover of the first example, thereby preventing production errors in the relay back cover of the first example; then the first universal mold 410 and the second universal mold 420 cooperate to complete the production of the relay back cover. When producing the relay back cover of the second example, only the replacement core 440 corresponding to the relay back cover of the second example needs to be placed in the second universal mold 420. Since this embodiment involves two types of relay back covers, two types of replacement cores 440 are correspondingly provided. In other embodiments, the type of replacement core 440 can be adaptively set according to the type of relay back cover. For example, if there are five types of relay back covers, then the replacement core 440 is set to five types accordingly.

[0061] Furthermore, since the structure of the first and second example relay back covers is largely the same, to avoid mixing of the two types of replacement cores 440 during production, different markings can be set on the two types of replacement cores 440. This allows the two relay back covers produced using a universal mold structure to have different markings, and also facilitates operators in distinguishing the two types of relay back covers during assembly; for example, as... Figure 3 and Figure 5 As shown, the label "A" is displayed on the rear cover of the first example relay, as... Figure 7 and Figure 8 As shown, the symbol "B" is displayed on the rear cover of the second example relay. In other embodiments, the symbol may also be set as different numbers or graphics, which will not be described here.

[0062] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A relay back cover disposed on a thermal overload relay (10), the thermal overload relay (10) cooperating with a contactor (20), characterized in that, The relay rear cover includes: Cover (100), the cover (100) is closed and installed on the rear end of the thermal overload relay (10), and the cover (100) is provided with a clearance hole (110) that allows wires to pass through; The shielding member (200) includes a shielding part (210) and a first auxiliary part (220). The first end of the shielding part (210) is connected to the cover (100) and is disposed above the clearance hole (110). The second end of the shielding part (210) extends away from the cover (100). The first side of the shielding part (210) is connected to the first auxiliary part (220). The first auxiliary part (220) extends away from the shielding part (210) and cooperates with the shielding part (210) to form a shielding space. The projection of the second side of the shielding part (210) on the projection plane (30) is tangent to the clearance hole (110). When the thermal overload relay (10) cooperates with the contactor (20), the second side of the shielding part (210) is used to abut against the side wall of the corresponding isolation rib (21) on the contactor (20).

2. The relay back cover according to claim 1, characterized in that, Along the length of the shielding member (200), the cross-sectional shape of the side wall of the first auxiliary part (220) near the clearance hole (110) is arc-shaped.

3. The relay back cover according to claim 2, characterized in that, The radius of the arc is equal to the radius of the clearance hole (110), and the center of the arc coincides with the center of the clearance hole (110).

4. The relay back cover according to claim 1, characterized in that, The shielding member (200) further includes a second auxiliary part (230), which is connected to the side of the first auxiliary part (220) away from the shielding part (210) and extends along the direction from the first side to the second side of the shielding part (210).

5. The relay back cover according to claim 4, characterized in that, The projection of the side of the second auxiliary part (230) away from the first auxiliary part (220) onto the projection surface (30) is tangent to the clearance hole (110).

6. The relay back cover according to claim 4, characterized in that, The second auxiliary part (230) and the shielding part (210) are both parallel to the projection surface (30).

7. The relay back cover according to claim 1, characterized in that, The end face of the second end of the shielding member (200) is set to be flush.

8. The relay back cover according to any one of claims 1-7, characterized in that, The relay back cover also includes a wiring socket (300), which is disposed on the cover body (100) corresponding to the clearance hole (110), and the clearance hole (110) passes through the wiring socket (300) to form a clearance channel. The first end of the shielding member (200) is connected to the cover body (100) through the wiring socket (300).

9. The relay back cover according to claim 8, characterized in that, The end face of the wiring sleeve (300) facing away from the cover (100) is set to be flush.

10. The relay back cover according to claim 8, characterized in that, The cover (100) is integrally formed with the wiring sleeve (300) and the shielding member (200).

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