Shell of switch unit

Abstract

The invention discloses a shell of a switch unit. The shell is provided with a transmission shaft mounting hole, a sliding rail and a static contact mounting part, wherein the slide rail extends from the transmission shaft mounting hole to the direction of the static contact mounting part, and is used for providing sliding support for a moving contact. According to the invention, a larger arc extinguishing chamber can be realized, the arc extinguishing effect is improved, and the miniaturization design of products is facilitated.

Description

Technical Field

[0001] The invention relates to the field of low-voltage electrical appliances, and in particular to a shell of a switch unit. Background Art

[0002] The rotary disconnector is usually composed of an operating mechanism unit and several stacked switch units. The switch unit includes a unit housing, each of which is equipped with a pair of stationary contact assemblies and a rotatable moving contact module. The moving contact module is fixed on the rotating shaft, and the operating mechanism unit can operate the rotating shaft to rotate, thereby closing or opening the moving and stationary contacts.

[0003] The traditional moving contact moves in a circular motion, so it is necessary to leave space for the moving contact to move in the housing. Specifically, a circular cavity is set in the middle area of ​​the housing for the moving contact and its support to rotate. This results in an increase in the housing structure and compresses the space available for the arc extinguishing chamber, which limits the arc extinguishing effect of the traditional disconnector and makes the product volume larger. Summary of the invention

[0004] The purpose of the present invention is to overcome the defects of the prior art and provide a housing of a switch unit.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] A housing of a switch unit, the housing being provided with: a transmission shaft mounting hole, a slide rail and a static contact mounting portion;

[0007] Wherein, the slide rail extends from the transmission shaft mounting hole toward the static contact mounting portion to provide sliding support for the moving contact.

[0008] Preferably, the slide rail is formed by two parallel retaining walls arranged on the bottom surface of the shell.

[0009] Preferably, the slide rail comprises: a first slide rail extending from the middle area of ​​the shell to the first side edge of the shell and a second slide rail extending from the middle area of ​​the shell to the second side edge of the shell, and the first side and the second side are two opposite sides.

[0010] Preferably, two slide rails, four static contact mounting parts, and four arc extinguishing chamber setting parts are provided in the shell, the transmission shaft mounting hole is located in the middle of the shell, and isolation bosses are provided on radially opposite sides of the transmission shaft mounting hole to separate the shell into a first side cavity and a second side cavity, and the two slide rails are respectively arranged in the first side cavity and the second side cavity relative to the radial direction of the mounting hole, two of the four static contact mounting parts are arranged in the first side cavity, and the other two are arranged in the second side cavity, and two of the four arc extinguishing chamber setting parts are respectively arranged on both sides of the slide rails of the first side cavity, and the other two are arranged on both sides of the slide rails of the second side cavity.

[0011] Preferably, a slide rail separates the first side cavity into a first cavity and a second cavity, and another slide rail separates the second side cavity into a third cavity and a fourth cavity, and a static contact mounting portion and an arc extinguishing chamber setting portion are respectively provided in the first cavity, the second cavity, the third cavity and the fourth cavity.

[0012] Preferably, the shell is rectangular, and the first cavity, the second cavity, the third cavity and the fourth cavity are respectively located in four corner areas of the rectangle.

[0013] Preferably, a sliding limit boss is provided at one end of the slide rail facing the stationary contact mounting portion; and stationary contact limit bosses are provided at both ends of the limit boss.

[0014] Preferably, a through hole penetrating downward is provided on the housing adjacent to the stationary contact mounting portion, so as to be used for setting a series connection structure for connecting the stationary contacts in series.

[0015] Preferably, the shell is formed by splicing a first half shell and a second half shell, a first half through hole is provided at the splicing portion of the first half shell, and a second half through hole is provided at the splicing portion of the second half shell, and after splicing, the first half through hole and the second half through hole constitute the through hole.

[0016] Preferably, the shell is formed by splicing a first half shell and a second half shell, and the two retaining walls are respectively arranged near the splicing point of the first half shell and the second half shell.

[0017] Preferably, a reinforcing rib is further provided on a side adjacent to the two retaining walls and away from the joint, the reinforcing rib is provided along the extension direction of the two retaining walls, and an auxiliary supporting surface is provided on the top of the reinforcing rib.

[0018] The housing structure of the embodiment of the present invention is different from that of the conventional switch unit, in that the movable contact is driven by a slide rail, while the conventional housing structure is to provide a rotating space for the movable contact to rotate. The way in which the slide rail drives the movable contact in the embodiment reduces the space required for the movable contact to move, thereby expanding the use space of the arc extinguishing chamber, achieving a better arc extinguishing effect, and facilitating the miniaturization design of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the housing structure of the switch unit of the present invention;

[0020] Figure 2 is a schematic diagram of the housing structure of the switch unit of the present invention (from another perspective);

[0021] Figure 3 It is a schematic diagram of the housing and internal structure of the switch unit of the present invention;

[0022] Figure 4 It is a structural schematic diagram of the support member of the present invention;

[0023] Figure 5 It is a schematic diagram of the structure of the moving contact of the present invention;

[0024] Figure 6 is a schematic diagram of the series connection structure between the switch units of the present invention;

[0025] Figure 7 It is a schematic diagram of the shell splicing structure of the switch unit of the present invention.

[0026] L1 The first switch unit L2 The second switch unit 20 Interrupter 31 Stationary contact 32 Stationary contact 31a First stationary contact 32a Second static contact 31b The third static contact 32b Fourth static contact 40 Moving contact 40a First moving contact 40b Second moving contact 401 Mounting holes 411 First sliding surface 101 Drive shaft mounting hole 102 Isolation boss 103 Slide rails 104 Arc extinguishing chamber setting part 105 Stationary contact mounting part 108 Through Hole 108a First half through hole 108b Second half through hole 1030 Retaining Wall 1031 Second sliding surface 80 Support 801 Transmission connection 802 slider 803 Contact connection 804 Limiting surface 106 Limit boss 107 Static contact limit boss DETAILED DESCRIPTION

[0027] The following is a further description of the specific implementation of the housing of the switch unit of the present invention in conjunction with the embodiments given in the accompanying drawings. The housing of the switch unit of the present invention is not limited to the description of the following embodiments.

[0028] A rotary isolating switch usually includes an operating unit and at least one switch unit, which are stacked together. The switch unit includes a moving contact and a stationary contact. The operating unit is provided with an output shaft, which is connected to a contact drive mechanism of the switch unit. The contact drive mechanisms of adjacent switch units are connected. The output shaft of the operating unit rotates to drive the contact drive mechanism of the switch unit. The contact drive mechanism drives the moving contact to cooperate with the stationary contact to achieve closing and opening of the switch unit.

[0029] like Figure 1-3 As shown, the present invention provides a specific embodiment of a shell of a switch unit, wherein the shell is provided with: a transmission shaft mounting hole 101, a slide rail 103 and a static contact mounting portion 105; wherein the slide rail 103 extends from the vicinity of the transmission shaft mounting hole 101 toward the direction of the static contact mounting portion 105 to provide sliding support for the moving contact 40.

[0030] In some embodiments, for example, when used in an environment with relatively large current, an arc extinguishing chamber should be provided in the switch unit for breaking and extinguishing the arc. Therefore, the housing is also provided with an arc extinguishing chamber setting portion 104 for installing the arc extinguishing chamber.

[0031] As a specific implementation, the slide rail 103 is formed by two parallel retaining walls 1030 arranged on the bottom surface of the housing. Of course, the slide rail 103 can be in a variety of structural forms, for example, it can also be a single retaining wall structure, or a V-shaped groove or V-shaped long strip protrusion structure, or a long rod structure.

[0032] This embodiment is described with two parallel retaining walls 1030. Correspondingly, there are multiple implementations for the movable contact 40 to slide on the two parallel retaining walls 1030. This embodiment is described with one of them to show that it is feasible to set the slide rail 103 on the housing to drive the movable contact 40.

[0033] For this embodiment, the slide rail 103 is arranged in a straight line. Based on the existing square or rectangular housing structure, the straight line arrangement can save more moving contact movement space. Of course, the slide rail 103 can also be arranged in a curved manner. For example, in some special usage scenarios, the housing needs to be made into an arc structure, or based on the component layout requirements inside the housing, the slide rail 103 can also be arranged in a circular arc structure.

[0034] Specifically, Figure 3 As shown (to facilitate observation of the interior, Figure 3 A group of arc extinguishing chambers are hidden in the display), the moving contact 40 can be set between the two retaining walls 1030 through the support member 80, used for limiting and sliding, and the moving contact 40 and the support member 80 are fixedly connected.

[0035] Please continue to refer to Figure 4 As shown, the support member 80 includes a slider 802 slidably connected to the slide rail 103, a contact connecting portion 803 fixedly connected to the moving contact 40, and a transmission connecting portion 801 for transmission connection with the contact driving mechanism. The shape and size of the slider 802 are adapted to the spacing between the two retaining walls 1030, and the sliding direction can be well limited. A limiting surface 804 is also provided on the upper part of the slider 802 to limit the moving contact 40 and prevent the moving contact 40 from shaking.

[0036] Of course, the structure of the slider 802 is mainly set according to the structural form of the slide rail 103. If the slide rail 103 adopts other forms such as trapezoidal rails, columnar rails, etc., the shape of the slider 802 also needs to be set accordingly.

[0037] Please continue to refer to Figure 5As shown, the moving contact 40 is installed on the contact connection part 803 of the support member 80 through the installation hole 401. The moving contact 40 is provided with a first sliding surface 411. The first sliding surface 411 and the limiting surface 804 of the support member 80 are mutually limited to prevent the swing of the moving contact. At the same time, the first sliding surface 411 contacts the second sliding surface 1031 at the top of the retaining wall 1030, and the moving contact 40 is supported upward by the second sliding surface 1031 of the retaining wall (i.e., the main sliding friction generating surface). The second sliding surface 1031 at the top of the retaining wall 1030 is used to support the sliding, so that the contact area can be made smaller (relative to the slider 802), thereby making the sliding smoother.

[0038] The shell structure of this embodiment is different from the shell structure of the traditional switch unit. The sliding rail 103 is provided to drive the moving contact 40, while the traditional shell structure is to provide a rotating space for the moving contact to rotate. The way in which the sliding rail drives the moving contact in this embodiment reduces the space required for the movement of the moving contact, thereby expanding the use space of the arc extinguishing chamber, achieving a better arc extinguishing effect, and being conducive to the miniaturization design of the product. Furthermore, if used in some scenes with relatively small currents, the demand for the arc extinguishing chamber is not very high, then the shell of this embodiment can further reduce the volume, thereby further reducing the overall structure of the switch unit.

[0039] Of course, in order to realize the sliding of the moving contact, the present embodiment adopts the driving method of combining the transmission shaft 70 with the two-link mechanism, which occupies relatively little space. Figure 3 and 6 The figure shows the contraction and extension states of the two-link mechanism, and it can be seen that the space occupied by the two-link mechanism after contraction is also very small, and it can drive the moving contact 40 to achieve a sufficient opening distance for movement. Specifically, taking the first switch unit L1 of one layer as an example, a rotating frame 60 is radially fixed on the transmission shaft 70 as the first connecting rod, the rotating frame is hinged to one end of the second connecting rod 50, and the other end of the second connecting rod 50 is hinged to the moving contact 40. The transmission shaft 70 rotates through the rotating frame 60 and the second connecting rod 50 to drive the moving contact 40 to slide linearly along the slide rail 103, and to contact or separate with the static contact.

[0040] As a further improvement, the slide rail 103 includes: a first slide rail 103a extending from the middle area of ​​the shell to the first side edge of the shell and a second slide rail 103b extending from the middle area of ​​the shell to the second side edge of the shell. The first side and the second side are two opposite sides. This arrangement is used for the transmission shaft to drive two moving contacts at the same time, increasing the number of moving contacts and realizing multi-circuit control.

[0041] As a further improvement, refer to Figure 1In this embodiment, the housing is provided with two slide rails 103, four static contact mounting parts 105, and four arc extinguishing chamber setting parts 104. The transmission shaft mounting hole 101 is located in the middle of the housing. Isolation bosses 102 are provided on two radially opposite sides of the transmission shaft mounting hole 101 to separate the housing into a first side cavity and a second side cavity. The two slide rails 103 are respectively arranged in the first side cavity and the second side cavity relative to the radial direction of the mounting hole 101; two of the four static contact mounting parts 105 are arranged in the first side cavity, and the other two are arranged in the second side cavity; two of the four arc extinguishing chamber setting parts 104 are respectively arranged on both sides of the slide rail 103 of the first side cavity, and the other two are arranged on both sides of the slide rail 103 of the second side cavity. In this way, two groups of independent circuit switches are arranged in the housing in an orderly manner, making full use of the structure of the housing, realizing the arrangement of the two groups of circuit switches, maximizing the arc extinguishing chamber setting part 104, and maximizing the moving contact opening distance.

[0042] Furthermore, a slide rail 103 separates the first side cavity into a first cavity and a second cavity, and another slide rail 103 separates the second side cavity into a third cavity and a fourth cavity. A static contact mounting portion 105 and an arc extinguishing chamber setting portion 104 are respectively provided in the first cavity, the second cavity, the third cavity and the fourth cavity. The arc extinguishing chamber setting portion 104 substantially completely occupies the space of the first cavity, the second cavity, the third cavity and the fourth cavity. The static contact mounting portion 105 is disposed adjacent to the side wall of the shell away from the isolation boss. After the arc extinguishing chamber is installed in the corresponding cavity, a space for the static contact mounting portion 105 is formed between the arc extinguishing chamber and the side wall of the shell away from the isolation boss. The two moving contacts slide back and forth between the drive shaft mounting hole 101 and the side wall of the shell away from the isolation boss on the two slide rails 103, respectively. In this embodiment, the shell is rectangular, and the first cavity, the second cavity, the third cavity and the fourth cavity are respectively located in the four corner areas of the rectangle. In this embodiment, as Figure 2 As shown, a sliding limiting boss 106 is provided at one end of the slide rail 103 facing the static contact mounting portion 105. The limiting boss 106 can limit the sliding of the moving contact 40 to ensure the contact reliability of the moving contact.

[0043] Further, such as Figure 1 As shown in FIG. 2 , static contact limiting bosses 107 are provided at both ends of the limiting boss 106 , which can be used to limit the contact portion of the static contact 31 and the static contact 32 , thereby ensuring that the static contact will not shift during dynamic conditions such as transportation, use, and installation.

[0044] Furthermore, a through hole 108 penetrating downward is provided on the housing adjacent to the static contact mounting portion 105, so as to be used for setting a series connection structure for connecting the static contacts in series. Figure 6As shown, the first contact module of the first switch unit L1 includes: a first moving contact 40a, a first static contact 31a and a second static contact 32a, wherein the first moving contact 40a is used to simultaneously contact or disconnect with the first static contact 31a and the second static contact 32a to realize the conduction and disconnection of the first static contact 31a and the second static contact 32a. The second contact module of the second switch unit L2 includes: a second moving contact 40b, a third static contact 31b and a fourth static contact 32b, wherein the second moving contact 40b is used to simultaneously contact or disconnect with the third static contact 31b and the fourth static contact 32b to realize the conduction and disconnection of the third static contact 31b and the fourth static contact 32b. The second static contact 32a is electrically connected to the third static contact 31b through a series conductor 91 penetrating the upper and lower shells, and the series conductor 91 is connected in series up and down through a through hole 108.

[0045] In this embodiment, if Figure 3 and Figure 7 As shown, the shell is formed by splicing a first half shell a and a second half shell b, a first half through hole 108a is provided at the splicing portion of the first half shell a, and a second half through hole 108b is provided at the splicing portion of the second half shell b, and after splicing, the first half through hole 108a and the second half through hole 108b constitute the through hole 108. The two half shell structures are arranged to facilitate the subsequent assembly of various components, especially the installation of the serial structure.

[0046] Furthermore, the two retaining walls 1030 are respectively arranged near the joint of the first half shell a and the second half shell b.

[0047] Furthermore, a reinforcing rib 109 is provided on one side close to the two retaining walls 1030 and away from the joint, and the reinforcing rib 109 is provided along the extension direction of the two retaining walls 1030. The provision of the reinforcing rib can enhance the structural strength of the joint between the first half shell a and the second half shell b, and prevent the moving contact from shaking when sliding, which causes the moving contact to fail to accurately contact the static contact. At the same time, the two ends of the moving contact of this embodiment are provided based on the distance between the two static contacts. To ensure a sufficient safety distance, there are certain requirements for the distance between the two static contacts, so the lengths of the two ends of the moving contact are also relatively long. In this embodiment, an auxiliary support surface 1090 is provided on the top of the reinforcing rib 109, which can be used to support the two ends of the moving contact, so that the moving contact can maintain a horizontal state during the sliding process, so that it can accurately achieve docking contact with the static contact.

[0048] It should be noted that in the description of the present invention, the terms "upper", "lower", "left", "right", "inner", "outer", etc. indicate directions or positional relationships based on directions or positional relationships shown in the accompanying drawings, or directions or positional relationships that are usually placed when in use, and are only for the convenience of description, rather than indicating that the device or element referred to must have a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish descriptions, and cannot be understood as indicating relative importance.

[0049] The above contents are further detailed descriptions of the present invention in combination with specific preferred embodiments, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as falling within the protection scope of the present invention.

Claims

1. A housing of a switch unit, characterized in that: The housing is provided with: a transmission shaft mounting hole (101), a slide rail (103) and a stationary contact mounting portion (105); The slide rail (103) extends from the transmission shaft mounting hole (101) toward the stationary contact mounting portion (105) to provide sliding support for the moving contact (40).

2. The housing of the switch unit according to claim 1, characterized in that: The slide rail (103) is formed by two parallel retaining walls (1030) arranged on the bottom surface of the shell.

3. The housing of the switch unit according to claim 1 or 2, characterized in that: The slide rail (103) comprises: a first slide rail (103a) extending from the middle area of ​​the shell to the first side edge of the shell and a second slide rail (103b) extending from the middle area of ​​the shell to the second side edge of the shell, wherein the first side and the second side are two opposite sides.

4. The housing of the switch unit according to claim 1, characterized in that: Two slide rails (103), four stationary contact mounting parts (105), and four arc extinguishing chamber setting parts (104) are arranged in the shell; the transmission shaft mounting hole (101) is located in the middle of the shell; isolation bosses (102) are arranged on two radially opposite sides of the transmission shaft mounting hole (101) to separate the shell into a first side cavity and a second side cavity; the two slide rails (103) are respectively arranged in the first side cavity and the second side cavity relative to the radial direction of the mounting hole (101); two of the four stationary contact mounting parts (105) are arranged in the first side cavity, and the other two are arranged in the second side cavity; two of the four arc extinguishing chamber setting parts (104) are respectively arranged on both sides of the slide rail (103) of the first side cavity, and the other two are arranged on both sides of the slide rail (103) of the second side cavity.

5. The housing of the switch unit according to claim 4, characterized in that: A slide rail (103) separates the first side cavity into a first cavity and a second cavity, and another slide rail (102) separates the second side cavity into a third cavity and a fourth cavity, wherein a static contact mounting portion (105) and an arc extinguishing chamber setting portion (104) are respectively provided in the first cavity, the second cavity, the third cavity and the fourth cavity.

6. The housing of the switch unit according to claim 5, characterized in that: The shell is rectangular, and the first cavity, the second cavity, the third cavity and the fourth cavity are respectively located in four corner areas of the rectangle.

7. The housing of the switch unit according to claim 1, characterized in that: A sliding limit boss (106) is provided at one end of the slide rail (103) facing the stationary contact mounting portion (105); stationary contact limit bosses (107) are provided at both ends of the limit boss (106).

8. The housing of the switch unit according to claim 1, characterized in that: A through hole (108) penetrating downwards is provided on the housing adjacent to the stationary contact mounting portion (105) for providing a series connection structure for connecting the stationary contacts in series.

9. The housing of the switch unit according to claim 8, characterized in that: The shell is formed by splicing a first half shell (1a) and a second half shell (1b); a first half through hole (108a) is provided at the splicing portion of the first half shell (1a); a second half through hole (108b) is provided at the splicing portion of the second half shell (1b); after splicing, the first half through hole (108a) and the second half through hole (108b) constitute the through hole (108).

10. The housing of the switch unit according to claim 2, characterized in that: The shell is formed by splicing a first half shell (1a) and a second half shell (1b), and the two retaining walls (1030) are respectively arranged near the splicing point of the first half shell (1a) and the second half shell (1b); a reinforcing rib (109) is also arranged on a side close to the two retaining walls (1030) and away from the splicing point, and the reinforcing rib (109) is arranged along the extension direction of the two retaining walls (1030), and an auxiliary supporting surface (1090) is arranged on the top of the reinforcing rib (109).

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