Combination screw for fixing relay mounting foot and relay
By designing the sleeve and screw structure of the combined screw, the problem of relay installation screw falling in the control box is solved, and a stable installation and pick-up process is achieved, reducing the risk of equipment damage.
Patent Information
- Application Number
- CN202422555277.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-22
- Publication Date
- 2025-08-19
- Estimated Expiration
- 2034-10-22
AI Technical Summary
In the prior art, relay mounting screws are prone to fall off during the pick-up and placement of the control box, resulting in the risk of short circuit and equipment damage and other adverse conditions.
Design a combination screw, including a sleeve and a screw, the sleeve is fixed to the relay mounting foot, and the sleeve is equipped with an internal thread segment, and the screw includes a bar section and an external thread segment, which is fixed by clearance fit and screw connection to prevent the screw from falling.
It realizes that the screws are not easily dropped during the pick-up and placement process, avoiding the risk of short circuit and equipment damage, and improving installation stability and reliability.
Smart Images
Figure CN223241863U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of relays, in particular to a combined screw for fixing a relay mounting foot and a relay. Background Art
[0002] Currently, most relay mounting feet on the market are secured with screws. Relays are installed in a relatively small space inside a control box, which contains numerous wiring harnesses and components. During installation and disassembly, screws often fall into the control box, becoming stuck or covered by wiring harnesses or other components, making them impossible to remove. This poses a risk of short circuits, unusual noises, and damage to the equipment during vibration. Utility Model Content
[0003] To this end, the utility model provides a combination screw and a relay for fixing a relay mounting foot, so as to prevent the mounting screw of the relay from falling off during the process of taking and placing the relay.
[0004] To achieve the above purpose, the technical solutions provided by the present invention are as follows:
[0005] A combination screw for fixing a relay mounting foot, comprising a screw and a sleeve, wherein the sleeve is fixed to the mounting foot of the relay, and the sleeve hole of the sleeve is provided with an internal thread section; the screw comprises a nut and a rod, wherein the rod is passed through the sleeve, and the rod comprises a polished rod section connected to the nut and without threads, and an externally threaded section connected to the polished rod section and having external threads; the end of the sleeve facing the nut is defined as the first end, and the end away from the nut is defined as the second end; the total length of the rod is greater than the length of the sleeve, and the length of the polished rod section is not less than the sum of the distance from the first end of the sleeve to the internal thread section and the length of the internal thread section; the diameter of the polished rod section is less than the minimum inner diameter of the internal thread section of the sleeve.
[0006] Furthermore, the mounting foot of the relay is fixedly connected to the sleeve by injection molding; or, the mounting foot of the relay and the sleeve are an integrally molded structure.
[0007] Furthermore, the sleeve hole includes a first hole segment and a second hole segment connected to each other, the first hole segment extends to the first end of the sleeve, and the second hole segment extends to the second end of the sleeve; the first hole segment is the internal thread segment, and the second hole segment is a non-thread segment.
[0008] Furthermore, the length of the polished rod section is not less than the length of the sleeve hole.
[0009] Furthermore, the length of the second hole section is greater than or equal to the length of the external thread section of the rod.
[0010] Furthermore, the combination screw for fixing the relay mounting foot also includes a washer set, and the washer set is arranged between the sleeve and the nut.
[0011] Furthermore, along the axial direction of the shank of the screw, the size of the polished shank section is not less than the sum of the distance from the first end of the sleeve to the internal thread section, the sizes of the internal thread section and the washer assembly.
[0012] Furthermore, the washer group includes flat washers and spring washers stacked in sequence.
[0013] Furthermore, in the pre-installation state, the external thread section of the screw is fitted into the internal thread section of the sleeve to prevent the screw from falling off; in the installation state, the external thread section of the screw is screwed out of the internal thread section of the sleeve, so that the bare rod section and the internal thread section of the sleeve form a clearance fit; the external thread section of the screw is used to be screwed and fixed with the external component; when screwing out, the external thread section of the screw is screwed into the internal thread section of the sleeve again to prevent the screw from falling off.
[0014] A relay comprises a housing and a relay body assembled in the housing, wherein the housing is formed with mounting feet; a mounting structure is provided on the mounting feet, and the mounting structure is the above-mentioned combined screw for fixing the relay mounting feet.
[0015] Furthermore, the mounting structures are provided in multiple groups and distributed around the periphery of the housing.
[0016] The technical solution provided by the utility model has the following beneficial effects:
[0017] With the solution of this application, during pre-installation, the external thread section of the screw can be mated to the internal thread section of the sleeve to prevent the screw from falling out. During installation, the external thread section of the screw is unscrewed from the internal thread section of the sleeve and then screwed and fixed to an external component such as a control box to complete the installation. Moreover, during the installation process, the smooth rod section and the internal thread section of the sleeve can maintain a clearance fit to avoid poor installation due to component tolerances. When unscrewing, the external thread section of the screw can be screwed to the internal thread section of the sleeve to prevent the screw from falling out. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Figure 1 Shown is a schematic diagram of the appearance of the relay in the embodiment;
[0019] Figure 2 Shown is a partial structural cross-sectional view of a relay in an embodiment;
[0020] Figure 3 Shown Figure 2 A magnified schematic diagram of area A in the middle;
[0021] Figure 4 The figure shows a cross-sectional view of the combined screws in the relay in the embodiment in a pre-fixed state;
[0022] Figure 5 Shown Figure 4 A magnified schematic diagram of area B in the middle;
[0023] Figure 6 The figure shows a cross-sectional view of the combined screw in the embodiment during the fixing and installation process;
[0024] Figure 7 The figure shows a cross-sectional view of the combined screw in the embodiment when the fixation is completed;
[0025] Figure 8 Shown is a schematic structural diagram of a single screw in an embodiment;
[0026] Figure 9 Shown is a cross-sectional view of another embodiment of the combined screw when fixing is completed. DETAILED DESCRIPTION
[0027] To further illustrate various embodiments, the present invention is provided with accompanying drawings. These drawings form part of the disclosure of this invention and are primarily used to illustrate the embodiments and, in conjunction with the relevant description in the specification, to explain the operating principles of the embodiments. By referring to these drawings, those skilled in the art will understand other possible implementations and the advantages of this invention. The components in the figures are not drawn to scale, and similar reference numerals are generally used to represent similar components.
[0028] In the description of the present invention, terms such as "up", "down", "left", "right", "front", and "back" and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, they should not be understood as limiting the present invention.
[0029] The present invention will now be further described with reference to the accompanying drawings and specific implementation methods.
[0030] Reference Figures 1 to 8As shown, this embodiment provides a combination screw for fixing a relay mounting foot, comprising a screw 12, a sleeve 11, and a washer assembly 13. The sleeve 11 is fixed to the mounting foot 3 of the housing 2 of the relay 1. Specifically, in this embodiment, the sleeve 11 is made of stainless steel, and the mounting foot 3 of the relay 1 is fixedly connected to the sleeve 11 by injection molding; that is, the sleeve 11 is pre-embedded in the injection mold, and then the mounting foot 3 of the relay 1 with the sleeve 11 is obtained by injection molding; the molding is simple and the connection is firm; and the sleeve 11 is made of stainless steel, which has good rigidity and a stable connection with the screw 12, and is not easy to wear and break. Of course, in other embodiments, the stainless steel sleeve 11 can also be fixed to the mounting foot 3 of the housing 2 of the relay 1 by assembly; or the mounting foot 3 of the housing 2 of the relay 1 and the sleeve 11 are an integrally formed structure, that is, the sleeve 11 and the mounting foot 3 are made of the same material and connected as a whole, such as by injection molding the mounting foot 3 and the sleeve 11.
[0031] The sleeve hole 110 of the sleeve 11 is provided with an internal thread section 111; the screw includes a nut 121 and a rod 122, and the rod 122 is inserted into the sleeve 11, specifically into the sleeve hole 110 of the sleeve 11, and the washer group 13 is arranged between the sleeve 11 and the nut 121; that is, the rod 122 first passes through the washer group 13 and then is inserted into the sleeve 11.
[0032] The rod portion 122 includes a threadless polished rod section 123 that connects to the nut 121 and an externally threaded section 124 that connects to the polished rod section 123 and has external threads. The end of the sleeve 11 facing the nut 121 is defined as the first end 113, and the end facing away from the nut 121 is defined as the second end 114. The total length of the rod portion 122 is greater than the length of the sleeve 11, ensuring that the externally threaded section 124 of the rod portion 11 can protrude beyond the second end 114 of the sleeve 11 for threaded connection to external components such as a control box. The length of the polished rod section 123 is no less than the sum of the distance from the first end 113 of the sleeve 11 to the internally threaded section 111 and the length of the internally threaded section 111. In this embodiment, due to the addition of the washer assembly 13, the length of the polished rod section 123 should also be no less than the sum of the thickness of the washer assembly 13, the distance from the first end 113 of the sleeve 11 to the internally threaded section 111, and the length of the internally threaded section 111. At the same time, the diameter of the polished rod section 123 is smaller than the minimum inner diameter of the internal thread section 111 of the sleeve 11 , so that when the polished rod section 123 is located in the internal thread section 111 , it can form a clearance fit with the internal thread section 111 .
[0033] Specifically, in this embodiment, the internal thread segment 111 extends to the first end 113 of the sleeve 11. Therefore, the distance between the first end 113 of the sleeve 11 and the internal thread segment 111 is zero; that is, the internal thread segment 111 extends to the first end 113 of the sleeve 11. In this embodiment, in the axial direction of the rod portion 122 (that is, the screwing direction of the screw 12), the length of the polished rod segment 123 is not less than the sum of the thickness of the washer assembly 13 and the length of the internal thread segment 111. Of course, in other embodiments, if the distance between the internal thread segment 111 and the first end 113 of the sleeve 11 is not zero, this distance needs to be added.
[0034] During pre-installation, if Figure 4 and Figure 5 As shown, the external thread section 124 of the screw 12 can be matched to the internal thread section 111 of the sleeve 11 to prevent the screw 12 from falling off; when installing, as shown in FIG. Figure 5 and Figure 6 As shown, the external thread section 124 of the screw 12 is screwed downward out of the internal thread section 111 of the sleeve 11, so that the polished rod section 123 forms a clearance fit with the internal thread section 111 of the sleeve 11; then it is screwed and fixed with external components such as the control box to achieve installation. After the installation is completed, the state of the combined screw is as shown in FIG. Figure 7 During installation, the clearance between the polished rod section 123 and the internally threaded section 111 of the sleeve 11 allows for avoidance, preventing poor installation due to component tolerances. When unscrewing, the externally threaded section 124 of the screw 12 can be screwed back to the internally threaded section 111 of the sleeve 11, preventing the screw 12 from falling out.
[0035] In the axial direction of the rod 122 (i.e., the direction of screwing in and out of the screw 12), the length of the bare rod section 123 is not less than the sum of the thickness of the washer group 13, the distance from the first end 113 of the sleeve 11 to the internal thread section 111, and the length of the internal thread section 111, to ensure that the external thread section 124 of the screw 12 can be screwed downward out of the internal thread section 111 of the sleeve 11, and then screwed and fixed to external components such as the control box.
[0036] Furthermore, the sleeve hole 110 of the sleeve 11 includes a first hole section 4 and a second hole section 5 connected to each other, wherein the first hole section 4 extends to the first end 113 of the sleeve 11, and the second hole section 5 extends to the second end of the sleeve 11; since the distance from the first end 113 of the sleeve 11 to the internal thread section 111 is 0, the first hole section 4 is the internal thread section 111, and the second hole section 5 is a non-threaded section 112; Figure 2 and Figure 3 As shown, the diameter of the second hole section 5 is larger than that of the first hole section 4. With this design, the external thread section 124 of the screw 12 can transition unhindered in the second hole section 5 when being screwed out, making the screwing operation easier.
[0037] Further preferably, the length of the second hole section 5 is greater than the length of the external thread section 124 of the shank 122. In this way, when the mounting foot 3 is kept stationary, the external thread section 124 of the screw 12 can always remain in the second hole section 5 when it is unscrewed from the external component, so that the external thread section 124 will not engage with both the external component and the internal thread section 111 at the same time. That is, the external thread section 124 will first be completely unscrewed from the external component before engaging with the internal thread section 111, ensuring smooth unscrewing. Of course, the length of the second hole section 5 can also be equal to the length of the external thread section 124 of the shank 122.
[0038] Specifically, the washer assembly 13 includes a flat washer 132 and a spring washer 131 stacked in sequence; the flat washer 132 abuts against the first end 113 of the sleeve 11 , and the nut 121 presses against the spring washer 131 .
[0039] Of course, in other embodiments, the structure of the washer group 13 is not limited thereto, and a single spring washer 131 or a single flat washer 132 may also be used; or a combination of more washers, or as shown in FIG. Figure 9 The structure shown does not use the washer assembly 13, etc. When the washer assembly 13 is not used, the length of the polished rod section 123 can also be shortened accordingly; that is, as long as the length of the polished rod section 123 is not less than the sum of the distance from the first end 113 of the sleeve 11 to the internal thread section 111 and the length of the internal thread section 111.
[0040] Continue to refer to Figure 1 As shown, this embodiment also provides a relay 1, including a housing 2 and a relay body assembled in the housing 2, wherein the housing 2 is formed with a mounting foot 3; a mounting structure 10 is provided on the mounting foot 3, wherein the mounting structure 10 is the combination screw for fixing the relay mounting foot as described above.
[0041] During installation, align the mounting feet 3 of the relay 1 with the corresponding positions and then install it on an external component such as a control box through the mounting structure 10 . The specific installation method is to screw and fix it through the screw rod 12 mentioned above.
[0042] Specifically, the mounting structures 10 are provided in multiple groups (four groups in this embodiment) and are distributed around the outer periphery of the housing 2; the stability is better after installation.
[0043] Although the present invention has been specifically shown and described in conjunction with preferred embodiments, those skilled in the art should understand that various changes can be made to the form and details of the present invention without departing from the spirit and scope of the present invention as defined by the appended claims, and all of these changes are within the scope of protection of the present invention.
Claims
1. A combination screw for fixing a relay mounting foot, characterized in that: It comprises a screw and a sleeve, the sleeve is fixed on the mounting foot of the relay, and the sleeve hole is provided with an internal thread section; the screw comprises a nut and a rod, the rod is passed through the sleeve, the rod comprises a polished rod section connected to the nut and without threads, and an externally threaded section connected to the polished rod section and having external threads; the end of the sleeve facing the nut is defined as the first end, and the end away from the nut is defined as the second end; the total length of the rod is greater than the length of the sleeve, and the length of the polished rod section is not less than the sum of the distance from the first end of the sleeve to the internal thread section and the length of the internal thread section; the diameter of the polished rod section is less than the minimum inner diameter of the internal thread section of the sleeve.
2. The combination screw for fixing the relay mounting foot according to claim 1, characterized in that: The mounting foot of the relay is fixedly connected to the sleeve by injection molding; or the mounting foot of the relay and the sleeve are an integrally molded structure.
3. The combination screw for fixing the relay mounting foot according to claim 1, characterized in that: The sleeve hole includes a first hole section and a second hole section connected to each other, the first hole section extends to the first end of the sleeve, and the second hole section extends to the second end of the sleeve; the first hole section is the internal thread section, and the second hole section is a non-thread section.
4. The combination screw for fixing the relay mounting foot according to claim 3, characterized in that: The length of the polished rod section is not less than the length of the sleeve hole.
5. The combination screw for fixing the relay mounting foot according to claim 3, characterized in that: The length of the second hole section is greater than or equal to the length of the external thread section of the rod portion.
6. The combination screw for fixing the relay mounting foot according to claim 1, characterized in that: The combination screw for fixing the relay mounting foot further comprises a washer set, which is arranged between the sleeve and the nut.
7. The combination screw for fixing the relay mounting foot according to claim 6, characterized in that: Along the axial direction of the shank of the screw, the length of the polished shank section is not less than the sum of the distance from the first end of the sleeve to the internal thread section, the length of the internal thread section and the thickness of the washer assembly.
8. The combination screw for fixing the relay mounting foot according to claim 6, characterized in that: The washer group comprises flat washers and spring washers which are stacked in sequence.
9. The combination screw for fixing the relay mounting foot according to claim 1, characterized in that: In the pre-installation state, the external thread section of the screw fits into the internal thread section of the sleeve to prevent the screw from falling off; in the installation state, the external thread section of the screw is screwed out of the internal thread section of the sleeve, so that the bare rod section and the internal thread section of the sleeve form a clearance fit; the external thread section of the screw is used to be screwed and fixed with the external component; when screwing out, the external thread section of the screw is screwed into the internal thread section of the sleeve again to prevent the screw from falling off.
10. A relay comprising a housing and a relay body assembled in the housing, wherein the housing is formed with mounting feet; characterized in that: The mounting foot is provided with a mounting structure, and the mounting structure is a combination screw for fixing the relay mounting foot as described in any one of claims 1 to 9.
11. The relay according to claim 10, characterized in that: The mounting structures are provided in multiple groups and distributed around the outer periphery of the housing.