Static contact group of switching device

Abstract

The utility model discloses a static contact group of a switching device, which mainly improves the structure of a contact piece: the front part of the contact piece is provided with a multi-stage arc bend, and particularly forms a closing section and an embracing section, the closing section is used as a smooth transition section between an opening section and the embracing section, and the closing width of the closing section is smaller than the diameter of a contact column; symmetrical inwards-concave cambered surfaces are formed in the embracing section, the distance between arc tops is larger than the closing-up width of the closing-up section but smaller than the diameter of the contact column, when the contact column is clamped into the embracing section, the inwards-concave cambered surfaces of the embracing section generate elastic pressure on the contact column, and closing-up openings in the front end and the rear end of the embracing section limit the contact column front and back. Therefore, the contact between the contact column and the contact sheet is more stable and reliable, and is not easy to fall off.

Description

Technical Field

[0001] The present application relates to the technical field of switchgear in railway signal systems and power systems, and in particular to a static contact group of a switchgear. Background Art

[0002] As an important signal infrastructure equipment in railway turnout switching equipment, the switch machine can drive the turnout to switch and lock to ensure the safety of railway train driving. The electric switch machine uses a contact assembly to indicate the position status of the turnout, including a static contact group and a dynamic contact group, wherein the static contact group includes a static contact seat (block) and multiple groups of contact plates (usually three groups) fixed to the mounting slot of the static contact seat (block), each group of contact plates consists of a left contact plate and a right contact plate, and the dynamic contact group is in the form of a contact column (the contact surface is a cylindrical surface). When the contact column is inserted into the corresponding group of contact plates, the cylindrical surface of the contact column contacts the inner side surface of the contact plate to turn on the signal circuit. The static contact group of the switch machine controls the switching and indication of the turnout by closing and opening its contact plates. It plays a very important role in ensuring driving safety and improving transportation efficiency.

[0003] The structure of the close-fitting static contact group is similar to that of the switch machine static contact group, usually consisting of two sets of contact pieces. The close-fitting static contact group is mainly used to check the close-fitting state of the point rail and the heart rail, and can also be used to indicate the cut-off when the turnout is squeezed.

[0004] The structure of the static plug is similar to the static contact group of the switch machine, usually a group of contact pieces. The contact pieces of the static plug are used for power on / off control and circuit isolation in the power system. They are important components of low-voltage switches and low-voltage circuit breakers to ensure the stable operation of the circuit and the protection of the equipment.

[0005] The switch machine static contact group, close-fitting static contact group and static plug are all static contact groups in the switch device.

[0006] Researchers in this field have made many improvements in some details. For example:

[0007] Patent document CN201023491Y (A new type of reinforced static contact group for railway electric switch machine);

[0008] Patent document CN201354084Y (Redundant defrosting contact group for switch machine);

[0009] Patent document CN205469117U (balanced redundant contact group of switch machine);

[0010] Patent document CN217170693U (a constant pressure double-wing contact group);

[0011] Patent document CN209955998U (double-wing redundant reinforced dynamic and static contact group);

[0012] Patent document CN220865422U (a constant pressure dynamic and static contact group with an improved double-wing structure) and the like.

[0013] Among them, the last three figures in patent document CN217170693U (a constant pressure double-wing contact group) are also equivalent to respectively illustrating the static contact group of the switch machine (three groups of contact pieces), the close-fitting static contact group (two groups of contact pieces), and the static plug (one group of contact pieces).

[0014] The inventors noticed that in the above prior art static contact group, each group of contact pieces maintains this basic form: the left contact piece (first contact piece) and the right contact piece (second contact piece) are integrally formed with a front end opening for guidance, and the contact piece tends to be straight along the direction of the contact post insertion, and a pair of approximately straight inner side surfaces are in contact with the cylindrical surface of the contact post to achieve signal circuit conduction. Figure 1 , Figure 2 , Figure 3 In the three exemplary schemes shown, each group of contact pieces 2 is composed of a symmetrical first contact piece 2a and a second contact piece 2b. The rear part of the contact piece 2 is fixed to the static contact seat 1, and the front part extends out of the static contact seat, forming a front end opening as an entrance for the contact post 4 of the moving contact to be connected. Some schemes will also add an elastic reinforcement piece 3, which plays a role in assisting elastic pressure on the corresponding contact piece to the inside when the contact post is inserted into the front part of the contact piece. In these schemes, the contact and conduction parts of the front part of the contact piece 2 are all straight, and a pair of approximately straight inner side surfaces are in contact with the cylindrical surface of the contact post to realize signal circuit conduction.

[0015] In practice, poor contact sometimes still occurs. After an alarm is issued, the conversion and locking operations are performed manually. Summary of the invention

[0016] The present application provides a static contact group of a switch device, aiming to further improve the reliability of contact between dynamic and static contacts, thereby reducing manual operations.

[0017] In order to achieve the above objectives, this application provides the following technical solutions:

[0018] A static contact group of a switch device comprises a static contact seat and at least one group of contact pieces, each group of contact pieces comprises a first contact piece and a second contact piece which are symmetrical to each other, the rear parts of the first contact piece and the second contact piece are both mounted and fixed on the static contact seat, the front parts of the first contact piece and the second contact piece extend out of the static contact seat, and the whole forms a front end opening as an entrance for the contact column of the moving contact to be clamped; the improvements compared with the prior art are mainly:

[0019] The front parts of the first contact piece and the second contact piece have multi-stage arc bends, and the symmetrical structure of the front part as a whole includes an opening section, a closing section and an embracing section arranged in sequence along the insertion direction;

[0020] The opening section is used to form a guide for the docking point column;

[0021] The closing section serves as a smooth transition section between the opening section and the embracing section, and its closing width is smaller than the diameter of the contact column;

[0022] The embracing section forms a symmetrical concave arc surface, and the arc top spacing is greater than the closing width of the closing section, but smaller than the diameter of the contact column. When the contact column is inserted into the embracing section, the concave arc surface of the embracing section generates elastic pressure on the contact column, and the closing of the front and rear ends of the embracing section forms front and rear limiters for the contact column.

[0023] Optionally, a corresponding elastic reinforcing sheet is further provided on the outer side or the inner side of each group of contact sheets, and the rear part of the elastic reinforcing sheet and the corresponding contact sheet are installed and fixed at the same position of the static contact seat.

[0024] Optionally, the concave arc surface is matched with the cylindrical surface of the contact column, so that the contact column forms a surface contact with the concave arc surface when it is inserted into the embracing section.

[0025] Optionally, the minimum width of the closing section is 65% to 80% of the diameter of the contact column; the arc top spacing of the embracing section is 80% to 93% of the diameter of the contact column. Further optionally, for a contact column with a diameter of 14 mm, the minimum width of the closing section of the static contact group is 9.5 mm to 10.5 mm, and the arc top spacing of the embracing section is 11.5 to 12.5 mm.

[0026] Optionally, the specific form of the front part of the first contact piece and the second contact piece is: the front end of the main body of the first contact piece and the second contact piece is bent inward in opposite directions to form an inner section and an outer section, and the smooth transition part from the outer section to the inner section serves as the opening section and the closing section respectively, and the main body of the inner section serves as the embracing section.

[0027] Optionally, the specific form of the front part of the first contact piece and the second contact piece is: the front end of the main body of the first contact piece and the second contact piece directly forms an opening as the opening section, and is smoothly bent backward in sequence to form the closing section and the embracing section.

[0028] Optionally, each group of contact sheets is also configured with a redundant contact structure. Further optionally, the redundant contact structure is specifically in the form of: each group of contact sheets is divided into two independently spaced upper and lower layers of contact sheets; or, the front contact area of ​​each group of contact sheets is divided into two upper and lower layers.

[0029] Optionally, one group of contact pieces, two groups of contact pieces or three groups of contact pieces are installed on one static contact seat.

[0030] Compared with the prior art, this application has at least the following beneficial effects:

[0031] 1. The front part of the contact piece of the present application has multi-stage arc bends, especially forming a closing section and an embracing section, wherein the closing section serves as a smooth transition section between the opening section and the embracing section, and its closing width is smaller than the diameter of the contact column; the embracing section forms a symmetrical concave arc surface, and the arc top spacing is larger than the closing width of the closing section, but smaller than the diameter of the contact column. When the contact column is inserted into the embracing section, the concave arc surface of the embracing section generates elastic pressure on the contact column, and the closing of the front and rear ends of the embracing section forms front and rear limiters for the contact column, thereby making the contact between the contact column and the contact piece (at the embracing section) more stable and reliable.

[0032] 2. The concave arc surface of the present application can be matched with the cylindrical surface of the contact column, so that the contact column forms surface contact with the concave arc surface when it is inserted into the embracing section, further improving the reliability of the contact. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more intuitively illustrate the prior art and the present application, exemplary drawings are given below. It should be understood that the specific shapes and structures shown in the drawings should not generally be regarded as limiting conditions for implementing the present application; for example, those skilled in the art are capable of easily making conventional adjustments or further optimizations to the addition / reduction / attribution division, specific shapes, positional relationships, connection methods, dimensional ratios, etc. of certain units (components) based on the technical concepts and exemplary drawings disclosed in the present application.

[0034] Figure 1 It is a schematic diagram of the first structure of the prior art;

[0035] Figure 2 It is a second structural schematic diagram of the prior art;

[0036] Figure 3 It is a third structural schematic diagram of the prior art;

[0037] Figure 4 A schematic structural diagram of an embodiment of a contact sheet of the present application;

[0038] Figure 5 A schematic structural diagram of another embodiment of the contact sheet of the present application;

[0039] Figure 6 Based on Figure 4 The schematic diagram of the structure of the contact piece with an elastic reinforcement piece added thereto;

[0040] Figure 7 Based on Figure 5The schematic diagram of the structure of the contact piece with an elastic reinforcement piece added thereto;

[0041] Figure 8 , Fig. 9 They are Figure 6 , Figure 7 Axonometric drawing of the scheme shown;

[0042] Fig.10 To adopt Figure 6 A structural schematic diagram of an example of a static contact group of the structure shown.

[0043] Fig.11 To adopt Figure 7 A structural schematic diagram of an example of a static contact group of the structure shown.

[0044] Fig.12 A schematic diagram of a structure of a single contact sheet with a redundant contact structure (corresponding to Figure 4 infrastructure shown).

[0045] Fig.13 FIG. 1 is a schematic diagram of another embodiment of a single contact sheet with a redundant contact structure (corresponding to FIG. 1 ). Figure 5 infrastructure shown).

[0046] Fig.14 This is a schematic structural diagram of the first embodiment of the static contact group with redundant contacts of the present application.

[0047] Fig.15 It is a structural schematic diagram of a second embodiment of a static contact group with redundant contacts of the present application.

[0048] Fig.16 It is a schematic structural diagram of a third embodiment of a static contact group with redundant contacts of the present application.

[0049] Description of reference numerals:

[0050] 1. Static contact seat;

[0051] 2. Contact piece; 2a. First contact piece; 2b. Second contact piece;

[0052] 201, opening section; 202, closing section; 203, embracing section;

[0053] 3. Elastic reinforcement sheet;

[0054] 4. Contact post. DETAILED DESCRIPTION

[0055] The present application is further described below in detail through specific embodiments in conjunction with the accompanying drawings.

[0056] In the description of this application: unless otherwise specified, the meaning of "plurality" is two or more. The terms "first", "second", "third", etc. in this application are intended to distinguish the objects referred to, and do not have special meanings in terms of technical connotations (for example, they should not be understood as emphasizing the importance or order, etc.). Expressions such as "including", "comprising", "having", etc. also mean "not limited to" (certain units, components, materials, steps, etc.).

[0057] The static contact group of a switch device provided in the embodiment of the present application comprises a static contact seat and at least one group of contact pieces, each group of contact pieces comprises a first contact piece and a second contact piece which are symmetrical to each other, the rear parts of the first contact piece and the second contact piece are both mounted and fixed to the static contact seat, the front parts of the first contact piece and the second contact piece extend out of the static contact seat, and the whole forms a front end opening as an entrance for the contact column of the moving contact to be clamped; compared with the prior art, the improvement of the embodiment of the present application mainly lies in the shape and structure of the front part of the contact piece, specifically:

[0058] like Figure 4 , Figure 5 In the two exemplary structures shown, the front parts of the first contact piece and the second contact piece have multi-stage arc bends, and the symmetrical structure of the front part as a whole includes an opening section, a closing section and an embracing section arranged in sequence along the insertion direction; wherein:

[0059] The opening section is used to form a guide for the docking point column; the opening section itself can be an arc-shaped opening or a straight and bent opening; a smooth transition can be adopted between the opening section and the closing section;

[0060] The closing section serves as a smooth transition section between the opening section and the embracing section, and its closing width is smaller than the diameter of the contact column;

[0061] The embracing section forms a symmetrical concave arc surface, and the arc top spacing is greater than the closing width of the closing section, but smaller than the diameter of the contact column. When the contact column is inserted into the embracing section, the concave arc surface of the embracing section generates elastic pressure on the contact column, and the closing of the front and rear ends of the embracing section forms front and rear limiters for the contact column; thereby making the contact between the contact column and the contact sheet more stable and reliable.

[0062] The closing width and arc top spacing mentioned above refer to the dimensions when the contact post is not inserted (circuit disconnected state).

[0063] The concave arc surface can be matched with the cylindrical surface of the contact column, so that the contact column forms a surface contact with the concave arc surface when it is inserted into the embracing section, thereby increasing the contact area and further improving the reliability of the contact. It should be noted that the matching here does not mean that the diameter of the concave arc surface is completely equal to the diameter of the contact column, and the concave arc surface completely covers the cylindrical surface of the contact column, but is intended to emphasize that the corresponding actual product can form sufficient surface contact.

[0064] The front parts of the first contact piece and the second contact piece may have various specific forms, for example:

[0065] Figure 4 An exemplary structure is shown, in which the front ends of the main bodies of the first contact piece and the second contact piece are bent inward in opposite directions to form an inner section and an outer section, and the smooth transition portion from the outer section to the inner section serves as the opening section and the closing section respectively, and the main body of the inner section serves as the embracing section.

[0066] Figure 5 In another exemplary structure shown, the front ends of the main bodies of the first contact piece and the second contact piece are directly opened as the opening section, and are smoothly bent backward in sequence to form the closing section and the embracing section.

[0067] According to the need, a corresponding elastic reinforcing sheet can be arranged on the outside or inside of each group of contact sheets. Corresponding to the above two exemplary structures, the structure of adding an elastic reinforcing sheet on the outside of each group of contact sheets is as follows: Figure 6-Figure 11 Of course, the elastic reinforcing sheet can also be arranged on the inner side of the contact sheet, for example, Figure 4 The above exemplary structure can make the elastic reinforcing sheet be placed between the inner section and the outer section formed by the contact sheet being bent inward in the opposite direction. The rear part of the elastic reinforcing sheet and the rear part of the corresponding contact sheet are usually fitted together and fixed to the same position of the static contact seat.

[0068] It should be noted that, since the focus of the present application is on the front part of the contact piece, the drawings of each embodiment focus on the front structure of the contact piece, while the rear structure of the contact piece and its fixed connection structure with the static contact seat are partially omitted. A person skilled in the art can clearly understand that each embodiment of the present application can use the rear structure of the contact piece and its fixed connection structure with the static contact seat in various prior arts (not limited to the multiple patent documents mentioned in the above background art) or make simple conventional modifications.

[0069] Alternatively, if Figure 6 , Figure 7 As shown, the minimum width w of the closing section is 65% to 80% of the diameter of the contact column; the arc top spacing d of the embracing section is 80% to 93% of the diameter of the contact column. If the minimum width w of the closing section is too small, the resistance may be too great to drive into the embracing section; if the arc top spacing d of the embracing section is too large, the pressure applied to the connection column may be too small; if it is too large, the embracing section may not be able to be smoothly withdrawn when it needs to be disconnected.

[0070] Taking the contact column diameter of 14 mm as an example, the minimum width w of the closing section can be about 10 mm, and the arc top spacing d of the embracing section can be about 12 mm.

[0071] Taking into account that some contact posts are in the form of convex posts, the diameter of the contact post mentioned here should be understood as the diameter of the effective part of the contact post (i.e., the part of the contact post that ultimately makes reliable contact with the contact sheet).

[0072] Based on the front structure design of the contact sheet mentioned above, a redundant contact structure can also be configured for each group of contact sheets. The specific form of the redundant contact structure is: each group of contact sheets is divided into two layers of upper and lower contact sheets with independent spacing, which is the same as the existing technology; or, each group of contact sheets only has the front contact area divided into two layers (the rear part is connected as one), such as Fig.12 , Fig.13 If an elastic reinforcing sheet is added, it can be divided into two layers of upper and lower elastic reinforcing sheets, or it can be reinforced uniformly by a pair of larger elastic reinforcing sheets (such as Fig.14 , Fig.15 shown).

[0073] The structures of the upper and lower contact sheets / upper and lower contact areas are usually preferably the same specific structure to facilitate mass standardized production. However, in theory, they can also be different specific structures (for example, the upper layer uses Figure 4 The exemplary structure shown in the figure uses Figure 5 Even a certain layer can also adopt the existing conventional structure, such as Fig.16 As shown, each group of contact sheets is divided into two layers of upper and lower contact sheets that are independently spaced apart, wherein the contact sheets of the upper layer adopt the contact sheet form of the prior art and are equipped with corresponding elastic reinforcement sheets (similar to Figure 2 The structure shown in FIG. 1 ), the lower contact sheet adopts the Figure 4 Therefore, the redundant contact structure mentioned in the claims of this application should be considered to cover the above various combinations.

[0074] The drawings of the static contact groups mentioned above are mainly exemplified by the static contact groups of switch machines. The structural improvements on the front part of the static contact plates in the embodiments of the present application can be widely applied to the static contact groups of switch machines (three groups of contact plates), close-fitting static contact groups (two groups of contact plates), and static plugs (one group of contact plates). In multiple groups of contact plates, the structure of each group of contact plates should usually adopt the same specific structure, but in theory, different specific structures can also be adopted; the "each group of contact plates" mentioned in the claims of the present application only regards each group of contact plates as a relatively independent unit to facilitate the description of its structure, and does not limit the specific structure of each group of contact plates (each unit) to be the same. The claims of the present application should be deemed to cover the above various combinations.

[0075] Similarly, the structures of each group of elastic reinforcing sheets can adopt the same specific structure or different specific structures (as long as they can assist in applying elastic pressure to the inside of the corresponding contact sheet when the contact column is inserted into the front of the contact sheet).

[0076] During on-site installation and commissioning, the extension positions of the first contact piece and the second contact piece are adjusted according to the travel range of the contact column of the moving contact, so that when the contact column moves to the switch target position, the contact column just stops at the embracing section of the contact piece and makes reliable contact with the concave arc surface of the embracing section.

[0077] The technical features of the above embodiments may be arbitrarily combined (as long as there is no contradiction in the combination of these technical features). To make the description concise, not all possible combinations of the technical features in the above embodiments are described; these embodiments that are not explicitly written should also be considered to be within the scope of this specification.

Claims

1. A static contact group of a switch device, comprising a static contact seat and at least one group of contact pieces, each group of contact pieces comprising a first contact piece and a second contact piece which are symmetrical to each other, the rear parts of the first contact piece and the second contact piece are both mounted and fixed to the static contact seat, the front parts of the first contact piece and the second contact piece extend out of the static contact seat, and the whole forms a front end opening as an entrance for the contact column of the moving contact to be clamped; characterized in that: The front parts of the first contact piece and the second contact piece have multi-stage arc bends, and the symmetrical structure of the front part as a whole includes an opening section, a closing section and an embracing section arranged in sequence along the insertion direction; The opening section is used to form a guide for the docking point column; The closing section serves as a smooth transition section between the opening section and the embracing section, and its closing width is smaller than the diameter of the contact column; The embracing section forms a symmetrical concave arc surface, and the arc top spacing is greater than the closing width of the closing section, but smaller than the diameter of the contact column. When the contact column is inserted into the embracing section, the concave arc surface of the embracing section generates elastic pressure on the contact column, and the closing of the front and rear ends of the embracing section forms front and rear limiters for the contact column.

2. The static contact group of the switch device according to claim 1, characterized in that: A corresponding elastic reinforcing sheet is also arranged on the outside or inside of each group of contact sheets, and the rear part of the elastic reinforcing sheet and the corresponding contact sheet are installed and fixed at the same position of the static contact seat.

3. The static contact group of the switch device according to claim 1, characterized in that: The inner concave arc surface is matched with the cylindrical surface of the contact column, so that the contact column forms surface contact with the inner concave arc surface when it is inserted into the embracing section.

4. The static contact group of the switch device according to claim 1, characterized in that: The minimum width of the closing section is 65% to 80% of the diameter of the contact column; the arc top spacing of the embracing section is 80% to 93% of the diameter of the contact column.

5. The static contact group of the switch device according to claim 4, characterized in that: For a contact column with a diameter of 14 mm, the minimum width of the closing section of the static contact group is 9.5 mm to 10.5 mm, and the arc top spacing of the embracing section is 11.5 to 12.5 mm.

6. The static contact group of the switch device according to claim 1, characterized in that: The specific form of the front part of the first contact piece and the second contact piece is: the front end of the main body of the first contact piece and the second contact piece is bent inward in opposite directions to form an inner section and an outer section, and the smooth transition part from the outer section to the inner section serves as the opening section and the closing section respectively, and the main body of the inner section serves as the embracing section.

7. The static contact group of the switch device according to claim 1, characterized in that: The specific form of the front part of the first contact piece and the second contact piece is: the front end of the main body of the first contact piece and the second contact piece directly forms an opening as the opening section, and is smoothly bent backward in sequence to form the closing section and the embracing section.

8. The static contact group of the switch device according to claim 1, characterized in that: Each group of contact sheets is also configured with a redundant contact structure.

9. The static contact group of the switch device according to claim 8, characterized in that: The specific form of the redundant contact structure is: each group of contact sheets is divided into two independently spaced upper and lower layers of contact sheets; or, the front contact area of ​​each group of contact sheets is divided into two upper and lower layers.

10. The static contact group of the switch device according to claim 1, characterized in that: One set of contact pieces, two sets of contact pieces or three sets of contact pieces are installed on one static contact seat.

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