Dual-branch micro switch and triggering method thereof

Abstract

A dual-branch micro switch and its triggering method are disclosed. The micro switch includes a base with an upper guide rod movably mounted on it. The upper guide rod cooperates with a lower guide rod. The upper guide rod has an upper spring and an upper contact spring assembly, and the lower guide rod has a lower spring and a lower contact spring assembly. The upper contact spring assembly cooperates with an upper contact piece assembly, and the lower contact spring assembly cooperates with a lower contact piece assembly. The upper contact piece assembly includes a left contact and a right contact, and the lower contact piece assembly includes a left contact and a right contact. The left and right contacts of the upper and lower contacts are electrically connected, and the right and lower contacts are electrically connected. This invention improves the reliability of the micro switch contacts by sequentially connecting the contacts with different functions in the two branches.

Description

Technical Field

[0001] This invention belongs to the field of electrical switches, and specifically relates to a dual-branch micro switch and its triggering method. Background Technology

[0002] High-voltage grounding and isolating limit switches are important control components, and their reliability directly affects the success rate of grounding and isolating operations. During field use, multiple instances of disconnector operation failures were observed. Analysis revealed that, as the circuit-breaking element after the disconnector has been fully engaged, the limit switch, after repeated arc interruptions, experiences increased contact resistance due to oxidation of the switch contacts, ultimately leading to disconnector operation failure.

[0003] Currently, all limit switch products adopt a single-branch single-break / double-break form. After the circuit arc is interrupted multiple times, the contact of this type of switch will become oxidized, resulting in poor contact, increased circuit resistance, or even circuit breakage, leading to loss of control of the control circuit.

[0004] Therefore, it is necessary to develop a highly reliable micro switch to eliminate the failure of knife switch operation caused by contact oxidation and increased contact resistance, and to improve the success rate of grounding and disconnection operations. Summary of the Invention

[0005] In view of the technical problems existing in the background art, the dual-branch micro switch and its triggering method provided by the present invention improve the reliability of micro switch contact by connecting the contacts with different functions of the two branches in sequence.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0007] A dual-branch micro switch and its triggering method are disclosed, comprising a base, an upper guide rod movably disposed on the base, the upper guide rod cooperating with a lower guide rod, an upper spring and an upper contact spring assembly disposed on the upper guide rod, and a lower spring and a lower contact spring assembly disposed on the lower guide rod; the upper contact spring assembly cooperates with an upper contact plate assembly, and the lower contact spring assembly cooperates with a lower contact plate assembly; the upper contact plate assembly includes an upper contact plate left contact and an upper contact plate right contact, and the lower contact plate assembly includes a lower contact plate left contact and a lower contact plate right contact, the upper contact plate left contact and the lower contact plate left contact being conductive, and the upper contact plate right contact and the lower contact plate right contact being conductive.

[0008] In a preferred embodiment, both the left and right contacts of the lower contact piece are equipped with magnetic arc blowing components.

[0009] In a preferred embodiment, the upper guide rod and the lower guide rod are located on the same straight line, and an action gap is provided between the upper guide rod and the lower guide rod. The upper guide rod is used to delay driving the lower guide rod to move downward.

[0010] In a preferred embodiment, an intermediate sleeve is provided between the upper guide rod and the lower guide rod. The top of the intermediate sleeve is provided with a spring placement groove, and an upper spring is provided in the spring placement groove. The upper spring is sleeved on the upper guide rod. The bottom of the lower guide rod is provided with a lower sleeve, and a lower spring is provided in the lower sleeve. The lower spring is sleeved on the lower guide rod.

[0011] In a preferred embodiment, the top of the upper guide rod is provided with a switch guide pulley.

[0012] In a preferred embodiment, the upper contact spring assembly is adapted to the upper stop metal sheet, and the lower contact spring assembly is adapted to the lower stop metal sheet.

[0013] The triggering method for a dual-branch micro switch is as follows:

[0014] Step 1: When the external component pushes the switch guide pulley, the upper guide rod is pressed downward, and the upper guide rod drives the upper contact spring assembly to move downward;

[0015] Step two, the upper contact spring assembly is compressed and deformed, the upper contact spring assembly jumps upward to the upper stop metal plate, and the upper contact plate assembly breaks;

[0016] Step 3: The upper guide rod continues to press downwards, and the tail end of the upper guide rod pushes the lower guide rod downwards, which in turn drives the lower contact spring assembly to move downwards.

[0017] Step four: The lower contact spring assembly is compressed and deformed, and the lower contact spring assembly jumps upward to the lower stop metal plate, and the lower contact plate assembly breaks apart;

[0018] Step 5: The magnetic arc blowing component elongates and cools the electric arc, achieving the purpose of rapid arc extinguishing.

[0019] This patent can achieve the following beneficial effects:

[0020] This invention achieves the sequential disconnection of the upper and lower contacts through the design of upper and lower guide rods, thus realizing both arc interruption and ensuring good contact resistance in a single knife switch control circuit. This effectively avoids the problem that conventional microswitches cannot simultaneously achieve both arc interruption and good contact resistance using only one contact. Attached Figure Description

[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0022] Figure 1 It is a schematic diagram of the structure of the present invention;

[0023] Figure 2 This is the equivalent circuit diagram of the present invention.

[0024] In the diagram: 1. Switch guide pulley; 2. Upper guide rod; 3. Lower guide rod; 4. Upper spring; 5. Lower spring; 6. Upper contact spring assembly; 7. Lower contact spring assembly; 8. Upper stop metal plate; 9. Lower stop metal plate; 10. Upper contact plate assembly; 11. Lower contact plate assembly; 12. Magnetic arc blowing assembly; 13. Base. Detailed Implementation

[0025] Example 1:

[0026] Preferred solutions include Figures 1 to 2 As shown, a dual-branch micro switch and its triggering method include a base 13, which is an insulating shell. Inside the base 13 are an upper guide rod 2, a lower guide rod 3, an upper spring 4, a lower spring 5, an upper contact spring assembly 6, a lower contact spring assembly 7, an upper stop metal plate 8, a lower stop metal plate 9, an upper contact plate assembly 10, a lower contact plate assembly 11, and a magnetic arc blowing assembly 12. The upper guide rod 2 has the upper spring 4 and the upper contact spring assembly 6, and the lower guide rod 3 has the lower spring 5 and the lower contact spring assembly 7. The upper contact spring assembly 6 cooperates with the upper contact plate assembly 10, and the lower contact spring assembly 7 cooperates with the lower contact plate assembly 11. The upper contact plate assembly 10 includes a left upper contact and a right upper contact, and the lower contact plate assembly 11 includes a left lower contact and a right lower contact. The left upper contact and the left lower contact are conductive, and the right upper contact and the right lower contact are conductive. This invention proposes a dual-branch micro switch and its triggering method, which employs two parallel switch contacts: a first set of switch contacts consisting of an upper contact plate assembly 10 and an upper contact spring assembly 6, and a second set of switch contacts consisting of a lower contact plate assembly 11 and a lower contact spring assembly 7. Furthermore, the two sets of switch contacts do not open and close simultaneously, but rather with a delay between them.

[0027] Furthermore, magnetic arc-blowing components 12 are provided at both the left and right contacts of the lower contact piece. For example... Figure 1 As shown, when the upper guide rod 2 moves downward, the first set of switch contacts opens first, and the second set of switch contacts opens later. When the second set of switch contacts opens, an electric arc will be generated in the second set of switch contacts, and the arc will be extinguished by the magnetic arc blowing component 12.

[0028] Furthermore, the upper guide rod 2 and the lower guide rod 3 are located on the same straight line, and an action gap is provided between the upper guide rod 2 and the lower guide rod 3. The upper guide rod 2 is used to drive the lower guide rod 3 downward after a delay. The length of the action gap is sufficient to ensure that the upper contact spring assembly 6 actuates first, and then the lower contact spring assembly 7 actuates.

[0029] In this embodiment, the upper contact spring assembly 6 and the lower contact spring assembly 7 are the elastic moving contacts of a conventional limit switch. An intermediate sleeve is provided between the upper guide rod 2 and the lower guide rod 3. A spring placement groove is provided at the top of the intermediate sleeve, and an upper spring is placed inside the spring placement groove. The upper spring is sleeved on the upper guide rod 2, and the upper guide rod 2 is provided with an annular baffle. A lower sleeve is provided at the bottom of the lower guide rod 3, and a lower spring is placed on the lower guide rod 3. The lower guide rod 3 is provided with an annular baffle. The upper and lower springs serve a reset function.

[0030] Furthermore, a switch guide pulley 1 is provided at the top of the upper guide rod 2. The switch guide pulley 1 is the contact element of the limit switch.

[0031] Furthermore, the upper contact spring assembly 6 is adapted to the upper stop metal sheet 8, and the lower contact spring assembly 7 is adapted to the lower stop metal sheet 9. The upper stop metal sheet 8 and the lower stop metal sheet 9 serve as wear-resistant parts. The distance between the upper contact spring assembly 6 and the upper stop metal sheet 8 is greater than the distance between the lower contact spring assembly 7 and the lower stop metal sheet 9.

[0032] Working principle:

[0033] When the external component pushes the switch guide pulley 1, it presses the upper guide rod 2 downward. The upper guide rod 2 drives the upper contact spring assembly 6 downward. Under a certain pressure, the contact spring jumps upward to the upper stop metal plate 8, disconnecting the upper contact point. When the external component further pushes the switch guide pulley 1, it presses the upper guide rod 2 downward. The tail end of the upper guide rod 2 pushes the lower guide rod 3 downward. The lower guide rod 3 drives the lower contact spring assembly 7 downward. Under a certain pressure, the contact spring jumps upward to the lower stop metal plate 9, disconnecting the lower arc-extinguishing contact. To quickly extinguish the arc and prevent burnt contacts, a magnetic arc-blowing assembly 12 is installed to lengthen and cool the arc, achieving the purpose of rapid arc extinguishing.

[0034] To control the opening and closing of the high-voltage grounding switch, existing technology uses ordinary microswitches in conjunction with a limiting mechanism to control the switch's position. However, as the main component for cutting off the circuit current, the ordinary microswitch, by constantly interrupting the arc, can lead to poor contact at the contacts and increased circuit resistance, thus affecting the success rate of the grounding switch operation. Figure 2 As shown, when the contacts open: the contact point opens before the arc-breaking contact. The contact point closes after the arc-breaking contact closes. This patent uses a connecting rod divided into upper and lower sections to control the sequential action of two sets of parallel contacts, ensuring that the contact that opens first does not participate in cutting off the arc, thus guaranteeing the reliability of the contact, while the contact that opens later is responsible for cutting off the arc.

[0035] The above embodiments are merely preferred technical solutions of the present invention and should not be considered as limitations on the present invention. The scope of protection of the present invention should be limited to the technical solutions described in the claims, including equivalent substitutions of the technical features described in the claims. That is, equivalent substitutions and improvements within this scope are also within the scope of protection of the present invention.

Claims

1. A dual-branch micro switch, comprising a base (13), wherein an upper guide rod (2) is movably provided on the base (13), characterized in that: The upper guide rod (2) cooperates with the lower guide rod (3). The upper guide rod (2) is provided with an upper spring (4) and an upper contact spring assembly (6). The lower guide rod (3) is provided with a lower spring (5) and a lower contact spring assembly (7). The upper contact spring assembly (6) cooperates with the upper contact plate assembly (10). The lower contact spring assembly (7) cooperates with the lower contact plate assembly (11). The upper contact plate assembly (10) includes an upper contact plate left contact and an upper contact plate right contact. The lower contact plate assembly (11) includes a lower contact plate left contact and a lower contact plate right contact. The upper contact plate left contact and the lower contact plate left contact are connected. The upper contact plate right contact and the lower contact plate right contact are connected. The upper guide rod (2) and the lower guide rod (3) are located on the same straight line. There is an action gap between the upper guide rod (2) and the lower guide rod (3). The upper guide rod (2) is used to delay the drive of the lower guide rod (3) to move downward. An intermediate sleeve is provided between the upper guide rod (2) and the lower guide rod (3). A spring placement groove is provided at the top of the intermediate sleeve, and an upper spring is provided in the spring placement groove. The upper spring is sleeved on the upper guide rod (2). A lower sleeve is provided at the bottom of the lower guide rod (3), and a lower spring is provided in the lower sleeve. The lower spring is sleeved on the lower guide rod (3). A magnetic arc blowing assembly (12) is provided at both the left contact point and the right contact point of the lower contact piece; The top of the upper guide rod (2) is equipped with a switch guide pulley (1); The upper contact spring assembly (6) is adapted to the upper stop metal sheet (8), and the lower contact spring assembly (7) is adapted to the lower stop metal sheet (9).

2. The triggering method for a dual-branch micro switch according to claim 1, characterized in that... Includes the following steps: Step 1: When the external component pushes the switch guide pulley (1), the upper guide rod (2) presses downward, and the upper guide rod (2) drives the upper contact spring assembly (6) to move downward; Step 2, the upper contact spring assembly (6) is compressed and deformed, the upper contact spring assembly (6) jumps upward to the upper stop metal plate (8), and the upper contact plate assembly (10) disconnects; Step 3, the upper guide rod (2) continues to press downward, and the tail end of the upper guide rod (2) pushes the lower guide rod (3) downward, and the lower guide rod (3) drives the lower contact spring assembly (7) to move downward; Step 4: The lower contact spring assembly (7) is compressed and deformed, and the lower contact spring assembly (7) jumps upward to the lower stop metal plate (9), and the lower contact plate assembly (11) disconnects; Step 5: The magnetic arc blowing component (12) elongates and cools the electric arc to achieve rapid arc extinguishing.

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