Load switch and ammeter

Abstract

The utility model provides a load switch and an ammeter, and relates to the technical field of low-voltage apparatuses. The load switch comprises a shell, and a driving mechanism, a moving contact mechanism, a static contact and a transmission piece which are arranged in the shell, the moving contact mechanism comprises a contact seat arranged in the shell, at least two moving contact rods arranged on the contact seat at intervals along a preset direction, and moving contacts fixedly arranged on the at least two moving contact rods respectively, the preset direction is parallel to the rotation axis of the contact seat, and the output end of the driving mechanism drives the contact seat to rotate through a transmission part; the static contact comprises a static contact rod arranged in the shell and at least two static contacts arranged on the static contact rod at intervals along a preset direction, the at least two static contacts are in one-to-one correspondence with the at least two movable contacts, and the overtravel of at least one movable contact is not equal to the overtravel of the other movable contacts. The load switch is simple in structure, and the stability of the contact resistance of the contact is high and can be maintained at a lower level.

Description

Technical Field

[0001] This application relates to the field of low-voltage electrical technology, and more specifically, to a load switch and an electricity meter. Background Technology

[0002] Load switches, as indispensable control devices in power systems, play a crucial role in circuit load management. Their core function is to regulate electrical energy transmission by precisely controlling the on / off state of the circuit, and they are widely used in power systems, industrial automation, building power distribution, and many other fields. Load switches mainly consist of three core components: a drive assembly, a moving contact assembly, and a stationary contact assembly. The drive assembly, as the actuator, is responsible for controlling the movement of the moving contact assembly; the moving and stationary contact assemblies constitute the key contact points for circuit on / off, realizing the control of electrical energy transmission.

[0003] According to the client's requirements, the contact resistance of the load switch should remain stable and at a low level after the moving and stationary contacts are closed. However, the contact resistance of the existing load switches fluctuates greatly after closing, which cannot meet the client's requirements. Utility Model Content

[0004] The purpose of this application is to address the shortcomings of the prior art by providing a load switch and meter with high stability of contact resistance and the ability to maintain it at a low level.

[0005] To achieve the above objectives, the technical solutions adopted in the embodiments of this application are as follows:

[0006] One aspect of this application provides a load switch, comprising: a housing, a drive mechanism, a moving contact mechanism, a stationary contact, and a transmission member disposed within the housing; the moving contact mechanism includes a contact seat disposed within the housing, at least two moving contact rods spaced apart along a preset direction and disposed on the contact seat, and moving contacts respectively fixedly disposed on the at least two moving contact rods, the preset direction being parallel to the rotation axis of the contact seat, and the output end of the drive mechanism driving the contact seat to rotate via the transmission member; the stationary contact includes a stationary contact rod disposed within the housing and at least two stationary contacts spaced apart along a preset direction on the stationary contact rod, the at least two stationary contacts corresponding one-to-one with the at least two moving contacts, and the overtravel of at least one moving contact being unequal to the overtravel of the other moving contacts.

[0007] Optionally, the contact seat is provided with at least two limiting surfaces, which correspond one-to-one with and abut against the moving contact rod. At least one limiting surface is not located in the same plane as the other limiting surfaces, so that the overtravel of at least one moving contact is not equal to the overtravel of the other moving contacts.

[0008] Optionally, the moving contact rod is provided with a mounting surface, and the moving contact abuts against the mounting surface. At least one mounting surface is not located in the same plane as the mounting surfaces on the other moving contact rods, so that the overtravel of at least one moving contact is not equal to the overtravel of the other moving contacts.

[0009] Optionally, the thickness of at least one moving contact is not equal to the thickness of the other moving contacts, so that the overtravel of at least one moving contact is not equal to the overtravel of the other moving contacts.

[0010] Optionally, the thickness of at least one stationary contact is not equal to the thickness of the other stationary contacts, so that the overtravel of at least one moving contact is not equal to the overtravel of the other moving contacts.

[0011] Optionally, the transmission component includes an extension and connecting portions that are perpendicularly connected to the two ends opposite to the extension. The extension direction of the connecting portions is parallel to the rotation axis of the output end. The contact seat is provided with a first mounting hole, and the output end of the drive mechanism is provided with a second mounting hole. The axes of the second mounting hole and the first mounting hole are parallel to each other. One connecting portion is inserted into the first mounting hole, and the other connecting portion is inserted into the second mounting hole.

[0012] Optionally, the contact seat is provided with at least two mounting shafts coaxially arranged, and at least two moving contact rods are respectively sleeved on the at least two mounting shafts.

[0013] Optionally, each mounting shaft is fitted with a contact spring, one leg of which abuts against the contact seat, and the other leg abuts against the side of the moving contact rod away from the stationary contact point.

[0014] Optionally, the two outermost mounting shafts are rotatably mounted in two mounting slots inside the housing.

[0015] In another aspect of the embodiments of this application, an electricity meter is provided, including a meter housing and a load switch as described above disposed within the meter housing.

[0016] The beneficial effects of this application include:

[0017] This application provides a load switch, comprising: a housing, a drive mechanism, a moving contact mechanism, a stationary contact, and a transmission component disposed within the housing; the moving contact mechanism includes a contact seat disposed within the housing, at least two moving contact rods spaced apart along a predetermined direction and disposed on the contact seat, and moving contacts respectively fixedly disposed on the at least two moving contact rods, the predetermined direction being parallel to the rotation axis of the contact seat, and the output end of the drive mechanism driving the contact seat to rotate via the transmission component; the stationary contact includes a stationary contact rod disposed within the housing and at least two stationary contacts spaced apart along a predetermined direction on the stationary contact rod, the at least two stationary contacts corresponding one-to-one with at least two moving contacts, and the overtravel of at least one moving contact being unequal to the overtravel of the remaining moving contacts. This load switch has a simple structure, high contact resistance stability, and can maintain a low level. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0019] Figure 1 This is one of the structural schematic diagrams of the load switch provided in the embodiments of this application;

[0020] Figure 2 This is a second schematic diagram of the structure of the load switch provided in the embodiments of this application;

[0021] Figure 3 This is one of the structural schematic diagrams of the moving contact mechanism and stationary contact in the load switch provided in the embodiments of this application;

[0022] Figure 4 This is the second schematic diagram of the moving contact mechanism and stationary contact in the load switch provided in the embodiments of this application;

[0023] Figure 5 This is a schematic diagram of the contact seat in a load switch provided in an embodiment of this application;

[0024] Figure 6 A partial structural diagram of the moving contact mechanism and stationary contact in a load switch provided in an embodiment of this application;

[0025] Figure 7 This is the third schematic diagram of the structure of the load switch provided in the embodiments of this application;

[0026] Figure 8 A cross-sectional view of a load switch provided in an embodiment of this application.

[0027] Icons: 10-Load switch; 11-Drive mechanism; 111-Output terminal; 1111-Second mounting hole; 12-Moving contact mechanism; 121-Contact seat; 1211-Limiting surface; 1212-First mounting hole; 1213-Moving shaft; 122-Moving contact rod; 1221-Moving surface; 123-Moving contact; 124-Contact spring; 13-Stationary contact; 131-Stationary contact rod; 132-Stationary contact; 14-Transmission component; 141-Extension; 142-Connecting part; 20-Housing; 21-Moving groove; 30-Meter; T1-Thickness of moving contact; T2-Thickness of stationary contact. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0029] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. It should be noted that, unless otherwise specified, the various features in the embodiments of this application can be combined with each other, and the combined embodiments are still within the protection scope of this application.

[0030] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0031] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this application is in use. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0032] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0033] Load switches, as indispensable control devices in power systems, play a crucial role in circuit load management. A load switch mainly consists of three core components: a drive assembly, a moving contact assembly, and a stationary contact assembly. The drive assembly, as the actuator, controls the movement of the moving contact assembly; the moving and stationary contact assemblies form the key contact points for circuit switching, realizing the control of electrical energy transmission. According to customer requirements, the contact resistance of the load switch should remain stable and at a low level after the moving and stationary contacts are closed. However, existing load switches exhibit significant fluctuations in contact resistance after closing, failing to meet customer requirements.

[0034] To address the aforementioned technical problems, one aspect of the embodiments of this application is described below. Figure 1 and Figure 2 A load switch 10 is provided, comprising: a housing 20, a drive mechanism 11, a moving contact mechanism 12, a stationary contact 13, and a transmission member 14 disposed within the housing 20. Please refer to the reference. Figure 3 The moving contact mechanism 12 includes a contact seat 121 disposed within the housing 20, at least two moving contact rods 122 spaced apart along a preset direction and disposed on the contact seat 121, and moving contacts 123 respectively fixedly disposed on the at least two moving contact rods 122. The preset direction is parallel to the rotation axis of the contact seat 121. The output end 111 of the drive mechanism 11 drives the contact seat 121 to rotate through the transmission member 14. The stationary contact 13 includes a stationary contact rod 131 disposed within the housing 20 and at least two stationary contacts 132 spaced apart along a preset direction on the stationary contact rod 131. The at least two stationary contacts 132 correspond one-to-one with the at least two moving contacts 123. The overtravel of at least one moving contact 123 is not equal to the overtravel of the other moving contacts 123.

[0035] Specifically, the drive mechanism 11 is fixed inside the housing 20 and has a reciprocating output end 111. This output end 111 is connected to the contact seat 121 of the moving contact mechanism 12 via a transmission member 14, thereby driving the contact seat 121 to reciprocate. By directly connecting the contact seat 121 to the output end 111 of the drive mechanism using the transmission member 14, the contact seat 121 rotates following the output end 111 of the drive mechanism 11, resulting in a simple structure that is easy to control. For example, the drive mechanism 11 is an electromagnetic mechanism.

[0036] Two or more independent movable contact rods 122 are provided on the contact base 121. The two or more movable contact rods 122 are distributed at intervals along a predetermined direction parallel to the rotation axis of the contact base 121, and each movable contact rod 122 can rotate relative to the contact base 121. A movable contact point 123 is fixedly provided on each movable contact point 122. A stationary contact rod 131 fixed in the housing 20 is provided on the side of the movable contact point 123. Two or more stationary contacts 132 are fixedly provided on the surface of the stationary contact rod 131 facing the movable contact point 123. The number of stationary contacts 132 is equal to the number of movable contacts 123 and corresponds one-to-one. Each stationary contact 132 is located on the movement path of its corresponding moving contact 123. Therefore, when the drive mechanism 11 drives the contact seat 121 to rotate in the closing direction through the transmission member 14, the moving contact 123 will contact its corresponding stationary contact 132; when the drive mechanism 11 drives the contact seat 121 to rotate in the opening direction through the transmission member 14, the moving contact 123 will separate from its corresponding stationary contact 132.

[0037] Among all moving contacts 123, at least one moving contact 123 has an overtravel that is not equal to the overtravel of the others. The overtravel referred to here is the distance that the moving contact 123 can move after the load switch 10 is fully closed. Since the load switch 10 has at least two moving contacts 123, the full closure of the load switch 10 means that all moving contacts 123 are in contact with their corresponding stationary contacts 132. Because the overtravels of each moving contact 123 are not exactly the same, during tripping, when the moving contact 123 with the smaller overtravel disconnects from the stationary contact 132, the moving contact 123 with the larger overtravel is still in contact with the stationary contact 132. An electric arc will be generated between the last moving contact 123 to separate and the stationary contact 132. No electric arc will be generated between the previously separated moving contacts 123 and the stationary contact 132. Therefore, the moving contact 123 with the smaller overtravel and the stationary contact 132 will not be burned or will be burned less.

[0038] Let the resistances of the contact branches formed between each pair of moving contacts 123 and stationary contacts 132 be denoted as R1, R2, ..., Rn, respectively. Then, the contact resistance R of the load switch 10 satisfies the following formula: R = R1 × R2 × ... × Rn / (R1 + R2 + ... + Rn). From this formula, it can be seen that if at least one set of moving contacts 123 and stationary contacts 132 is not burned or only minimally burned, the contact resistance R can be kept within a controllable range. Therefore, setting the overtravel of each moving contact 123 to be not exactly the same can improve the stability of the contact resistance of the load switch 10 and keep the contact resistance at a low level.

[0039] Optionally, there are two moving contact rods 122, two moving contacts 123, and two stationary contacts 132, which correspond one-to-one. In this case, one moving contact 123 has a large overtravel and the other moving contact 123 has a small overtravel. The pair of moving contacts 123 and stationary contacts 132 with the small overtravel will not be burned or will be burned less when the circuit is opened, so that the contact resistance R of the contact can be kept within a controllable range. This can also further simplify the mechanism of the load switch 10.

[0040] There are several ways to ensure that the overtravel of at least one moving contact 123 is not equal to the overtravel of the other moving contacts 123. Several feasible solutions are given below:

[0041] Option 1: Please refer to Figure 1 , Figure 4 and Figure 5 The overtravel of the moving contact 123 is changed by designing the dimensions of the contact seat 121. Specifically, the contact seat 121 is provided with at least two limiting surfaces 1211, which correspond one-to-one with and abut against the moving contact rod 122. At least one limiting surface 1211 is not located in the same plane as the other limiting surfaces 1211, so that the overtravel of at least one moving contact 123 is not equal to the overtravel of the other moving contacts 123.

[0042] With at least two moving contacts 122, moving contacts 123, and stationary contacts 132 aligned, the position of the limiting surface 1211 determines the position of the moving contacts 122, and consequently, the position of the moving contacts 123 on the moving contacts 122. Therefore, by setting at least one limiting surface 1211 to be in a different plane from the other limiting surfaces 1211, the moving contact 123 corresponding to that limiting surface 1211 will not be in the same position as the other moving contacts 123. Consequently, the overtravel of that moving contact 123 will be unequal to the overtravel of the other moving contacts 123.

[0043] Option 2: Please refer to Figure 1 and Figure 3 The overtravel of the moving contact 123 is changed by designing the dimensions of the moving contact rod 122. Specifically, each moving contact rod 122 is provided with a mounting surface 1221, and the moving contact 123 abuts against the mounting surface 1221. At least one mounting surface 1221 is not located in the same plane as the mounting surfaces 1221 on the other moving contact rods 122, so that the overtravel of at least one moving contact 123 is not equal to the overtravel of the other moving contacts 123.

[0044] With the contact seat 121, at least two moving contacts 123, and stationary contact 132 all aligned, the position of the mounting surface 1221 on the moving contact rod 122 determines the position of the moving contact 123. Therefore, by setting at least one mounting surface 1221 to be not located in the same plane as the other mounting surfaces 1221, the moving contact 123 that abuts against the mounting surface 1221 will not be in the same position as the other moving contacts 123, and thus the overtravel of the moving contact 123 will be unequal to the overtravel of the other moving contacts 123.

[0045] Option 3: Please refer to Figure 1 and Figure 6 The overtravel of the moving contact 123 is changed by designing the thickness T1 of the moving contact. Specifically, the thickness T1 of at least one moving contact is not equal to the thickness T1 of the other moving contacts, so that the overtravel of at least one moving contact 123 is not equal to the overtravel of the other moving contacts 123.

[0046] With the contact seat 121, at least two moving contact rods 122, and stationary contact 132 all remaining consistent, the thickness T1 of each moving contact determines the order in which they contact the stationary contact 132. Therefore, by setting the thickness T1 of at least one moving contact to be unequal to the thickness T1 of the other moving contacts, the overtravel of at least one moving contact 123 can be made unequal to the overtravel of the other moving contacts 123.

[0047] Option 4: Modify the overtravel of the moving contact 123 by designing the thickness T2 of the stationary contact. Specifically, the thickness T2 of at least one stationary contact is not equal to the thickness T2 of the other stationary contacts, so that the overtravel of at least one moving contact 123 is not equal to the overtravel of the other moving contacts 123.

[0048] With the contact seat 121, at least two moving contact rods 122, and moving contact 123 all maintaining the same position, the thickness T2 of each stationary contact determines the order in which they contact the moving contact 123. Therefore, by setting the thickness T2 of at least one stationary contact to be unequal to the thickness T2 of the other stationary contacts, the overtravel of at least one moving contact 123 can be made unequal to the overtravel of the other moving contacts 123.

[0049] It should be noted that the aforementioned four schemes can also be combined, as long as the overtravel of at least one moving contact 123 is not equal to the overtravel of the other moving contacts 123.

[0050] Please refer to Figure 7The output end 111 of the drive mechanism 11 is connected to the contact seat 121 through the transmission member 14. Optionally, the transmission member 14 includes an extension 141 and a connecting part 142 that is perpendicularly connected to both ends opposite to the extension 141. The extension direction of the connecting part 142 is parallel to the rotation axis of the output end 111. The contact seat 121 is provided with a first mounting hole 1212, and the output end 111 of the drive mechanism 11 is provided with a second mounting hole 1111. The axes of the second mounting hole 1111 and the first mounting hole 1212 are parallel to each other. One connecting part 142 is inserted into the first mounting hole 1212, and the other connecting part 142 is inserted into the second mounting hole 1111.

[0051] The rotation axis of the output end 111 of the drive mechanism 11, the rotation axis of the contact seat 121, and the axes of the two connecting parts 142 are parallel to each other. Rotation of the output end 111 of the drive mechanism 11 drives the connecting parts 142 inserted therein to rotate together around the rotation axis of the output end 111. The connecting part 142, through its extension 141, drives the other connecting part 142 inserted into the contact seat 121 to rotate, thereby driving the contact seat 121 to rotate around its own axis. This transmission member 14 can directly transmit the motion of the drive mechanism output end 111 to the contact seat 121, resulting in a simple structure and easy control of the driving process.

[0052] Alternatively, please refer to Figure 1 and Figure 3 The contact seat 121 is provided with at least two coaxially arranged mounting shafts 1213, and at least two moving contact rods 122 are respectively sleeved on the at least two mounting shafts 1213.

[0053] The number of mounting shafts 1213 is equal to the number of moving contact rods 122. Each mounting shaft 1213 is equipped with a moving contact rod 122. The moving contact rod 122 can rotate around the mounting shaft 1213, so that at least two moving contacts 123 with unequal overtravel can contact their corresponding stationary contacts 132, thereby completing the closing operation.

[0054] Optionally, each mounting shaft 1213 is fitted with a contact spring 124, one leg of the contact spring 124 abutting against the contact seat 121, and the other leg abutting against the side of the moving contact rod 122 fitted on the mounting shaft 1213 away from the stationary contact point 132.

[0055] When the moving contact 123 with a smaller overtravel contacts its corresponding stationary contact 132, the contact seat 121 needs to continue rotating in the closing direction so that the remaining moving contacts 123 with larger overtravels also contact their corresponding stationary contacts 132. During this process, the moving contact rod 122 of the already contacted moving contact 123 rotates relative to the contact seat 121, the contact spring 124 deforms and stores energy, and at the same time presses the moving contact rod 122 to ensure stable contact between the moving contact 123 and the stationary contact 132. When opening, the contact seat 121 rotates in the opening direction. After the moving contact 123 separates from the stationary contact 132, the contact spring 124 restores its energy, driving the corresponding moving contact rod 122 to reset, preparing for the next closing operation.

[0056] Optionally, please refer to the following: Figure 8 The two outermost mounting shafts 1213 are respectively rotatably disposed in the two mounting slots 21 inside the housing 20, thereby rotatably mounting the contact seat 121 inside the housing 20.

[0057] It can be understood that if there are two mounting shafts 1213, then the two mounting shafts 1213 are respectively inserted into the two mounting slots 21 inside the housing 20. If there are multiple mounting shafts 1213, then the first and last mounting shafts 1213 along the sequential setting direction are respectively inserted into the two mounting slots 21 inside the housing 20.

[0058] The mounting slot 21 can be disposed on the housing 20 or on other parts fixed inside the housing 20. For example, the housing 20 includes a base and a top cover that mates with the base, with a mounting plate between the base and the top cover. One mounting slot 21 is disposed on the base, and another mounting slot 21 is disposed on the side of the mounting plate facing the base.

[0059] Please refer to Figure 1 and Figure 2 This embodiment also provides an electricity meter 30, including a meter housing and a load switch 10 as described above disposed within the meter housing.

[0060] The meter 30 has the same structure and beneficial effects as the load switch 10 in the foregoing embodiments. The structure and beneficial effects of the load switch 10 have been described in detail in the foregoing embodiments and will not be repeated here.

[0061] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A load switch, characterized in that, include: The housing (20) includes a drive mechanism (11), a moving contact mechanism (12), a stationary contact (13), and a transmission component (14) disposed within the housing (20). The moving contact mechanism (12) includes a contact seat (121) disposed in the housing (20), at least two moving contact rods (122) spaced apart along a preset direction and disposed on the contact seat (121), and moving contacts (123) respectively fixedly disposed on the at least two moving contact rods (122). The preset direction is parallel to the rotation axis of the contact seat (121). The output end (111) of the driving mechanism (11) drives the contact seat (121) to rotate through the transmission member (14). The stationary contact (13) includes a stationary contact rod (131) disposed in the housing (20) and at least two stationary contacts (132) spaced apart on the stationary contact rod (131) along the preset direction. The at least two stationary contacts (132) correspond one-to-one with the at least two moving contacts (123). The overtravel of at least one moving contact (123) is not equal to the overtravel of the other moving contacts (123).

2. The load switch as described in claim 1, characterized in that, The contact seat (121) is provided with at least two limiting surfaces (1211), and the at least two limiting surfaces (1211) correspond one-to-one with the moving contact rod (122) and abut against it. At least one limiting surface (1211) is not located in the same plane as the other limiting surfaces (1211), so that the overtravel of at least one moving contact (123) is not equal to the overtravel of the other moving contacts (123).

3. The load switch as described in claim 1, characterized in that, The movable contact rod (122) is provided with a mounting surface (1221), and the movable contact (123) abuts against the mounting surface (1221). At least one of the mounting surfaces (1221) is not located in the same plane as the mounting surfaces (1221) on the other movable contact rods (122), so that the overtravel of at least one movable contact (123) is not equal to the overtravel of the other movable contacts (123).

4. The load switch as described in claim 1, characterized in that, The thickness (T1) of at least one of the moving contacts is not equal to the thickness (T1) of the other moving contacts, so that the overtravel of at least one of the moving contacts (123) is not equal to the overtravel of the other moving contacts (123).

5. The load switch as described in claim 1, characterized in that, The thickness (T2) of at least one of the stationary contacts is not equal to the thickness (T2) of the other stationary contacts, so that the overtravel of at least one of the moving contacts (123) is not equal to the overtravel of the other moving contacts (123).

6. The load switch as described in any one of claims 1 to 5, characterized in that, The transmission component (14) includes an extension (141) and a connecting portion (142) that is perpendicularly connected to both ends opposite to the extension (141). The extension direction of the connecting portion (142) is parallel to the rotation axis of the output end (111). The contact seat (121) is provided with a first mounting hole (1212). The output end (111) of the drive mechanism (11) is provided with a second mounting hole (1111). The axes of the second mounting hole (1111) and the first mounting hole (1212) are parallel to each other. One of the connecting portions (142) is inserted into the first mounting hole (1212), and the other connecting portion (142) is inserted into the second mounting hole (1111).

7. The load switch as described in any one of claims 1 to 5, characterized in that, The contact seat (121) is provided with at least two mounting shafts (1213) coaxially arranged, and at least two moving contact rods (122) are respectively sleeved on the at least two mounting shafts (1213).

8. The load switch as described in claim 7, characterized in that, Each of the mounting shafts (1213) is fitted with a contact spring (124), one leg of which abuts against the contact seat (121) and the other leg abuts against the side of the moving contact rod (122) away from the stationary contact point (132).

9. The load switch as described in claim 7, characterized in that, The two outermost mounting shafts (1213) are respectively rotatably disposed in the two mounting slots (21) inside the housing (20).

10. An electricity meter, characterized in that, Includes a watch case and a load switch as described in any one of claims 1 to 9 disposed within the watch case.

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