A protective micro switch for a flood gate

Abstract

The application relates to the technical field of microswitches, and particularly provides a protective microswitch for a flood-proof door, which comprises a sealed shell, an always-open terminal and an always-closed terminal are arranged in the sealed shell, a movable terminal is arranged between the always-open terminal and the always-closed terminal, the movable terminal is provided with a first terminal and a second terminal, and the first terminal and the second terminal on the movable terminal are sequentially arranged in contact with two contacts of the always-open terminal and the always-closed terminal, so that synchronous loss of multiple contacts caused by electric arc is avoided, at least half of the contact and terminal loss is reduced compared with the traditional simultaneous contact mode, the service life of the microswitch is prolonged, and if a certain terminal and contact are adhered due to electric arc welding, the other terminal can still normally separate from the contact due to asynchronous contact, the circuit can be timely disconnected, and a safety hazard caused by welding is avoided.

Description

Technical Field

[0001] This invention relates to the field of micro switch technology, and in particular to a protective micro switch for flood-proof doors. Background Technology

[0002] A micro switch is a switch with a small contact gap and a quick-acting mechanism that performs switching action with a specified stroke and a specified force. It is covered by a housing and has a drive rod on the outside. Because the contact gap of the switch is relatively small, it is called a micro switch, also known as a sensitive switch.

[0003] In the lifting or sliding mechanism of floodgates, microswitches can be used as limit switches. For example, when the floodgate rises to the highest position or falls to the lowest position, the corresponding microswitch is activated to stop the door from continuing to move, preventing the door from exceeding its limit position and causing damage, thus protecting the door and related equipment.

[0004] For example, Chinese patent CN118824753A discloses a limit switch and a power connector. This solution sets up a push rod, a common contact, a normally closed contact, a normally open contact, and a conductive connector. The conductive connector is always in contact with the common contact. By moving the push rod, the conductive connector makes contact with the normally closed contact and the normally open contact respectively, thereby realizing the electrical conduction between the common contact and the normally closed contact or the normally open contact.

[0005] However, the above solution may generate an electric arc when the common contact and normally closed or normally open contact are closed. This phenomenon will cause wear and tear on the normally closed contact, normally open contact and common contact. Furthermore, the high temperature of the electric arc during closure may cause the common contact and normally closed or normally open contact to fuse together, posing a safety hazard. Summary of the Invention

[0006] Therefore, it is necessary to provide a protective micro switch for flood-proof doors, addressing the problems of current switches being affected by arc losses during closing and opening, extending their service life, and being prone to welding during closing and opening.

[0007] The above objectives are achieved through the following technical solutions:

[0008] A protective micro switch for flood-proof doors, comprising:

[0009] A sealed housing, wherein normally open terminals and normally closed terminals are fixedly disposed inside the sealed housing, and each normally open terminal and normally closed terminal has two contacts;

[0010] A push rod is slidably sealed on the sealing housing. A movable terminal is provided on one end of the push rod inside the sealing housing. The movable terminal is located between the normally open terminal and the normally closed terminal. The movable terminal has a first terminal and a second terminal. The first terminal and the second terminal are configured to contact the two contacts of the normally open terminal or the normally closed terminal sequentially when the movable terminal is electrically connected to the normally open terminal or the normally closed terminal.

[0011] Furthermore, a guide rod is vertically arranged between the first terminal and the second terminal. The first terminal and the second terminal are slidably arranged on the outer periphery of the guide rod along the axial direction of the guide rod. The axis of the guide rod is parallel to the axis of the push rod. A first elastic element is vertically arranged between the first terminal and the second terminal. The first elastic element is used to push the first terminal and the second terminal away from each other.

[0012] Furthermore, a first pull rope is provided between the upper end face of the first terminal and the upper end face of the second terminal, the first pull rope is wound inside the push rod, and a first tension spring is provided between the first pull rope and the upper end face of the second terminal;

[0013] A second pull rope is provided between the lower end face of the first terminal and the lower end face of the second terminal. The second pull rope is wound inside the push rod. A second tension spring is provided between the second pull rope and the lower end face of the first terminal.

[0014] The push rod is equipped with a locking component, which is configured to delay and quickly release the second terminal or the first terminal when the first terminal or the second terminal contacts the normally open terminal or the normally closed terminal.

[0015] Furthermore, the locking assembly includes a first locking rod, a second locking rod, a first locking ramp, and a second locking ramp. The first locking rod and the second locking rod are slidably disposed inside the push rod. A second elastic element is disposed between the first locking rod and the second locking rod. The second elastic element is used to pull the first locking rod and the second locking rod closer to each other. The first locking ramp and the second locking ramp are slidably disposed inside the push rod. Both the first locking ramp and the second locking ramp are provided with a first inclined surface and a second inclined surface. The inclination of the second inclined surface is greater than that of the first inclined surface. Limiting grooves are formed on both the first terminal and the second terminal.

[0016] Furthermore, the sliding directions of the first locking ramp and the second locking ramp are perpendicular to the sliding directions of the first locking rod and the second locking rod.

[0017] Furthermore, the first inclined surface on the first locking ramp is located above the second inclined surface, and the second inclined surface on the second locking ramp is located above the first inclined surface.

[0018] Furthermore, both the first locking rod and the second locking rod have wedge-shaped surfaces at their ends that are far apart from each other, and the narrow ends of the two wedge-shaped surfaces are close to each other. The push rod has a first push plate and a second push plate slidably disposed inside it. The first push plate and the second push plate are respectively connected to the first locking ramp and the second locking ramp. The wedge-shaped surfaces on the first locking rod and the second locking rod slide against the first push plate and the second push plate.

[0019] Furthermore, there are multiple first locking blocks and multiple second locking blocks, and the multiple first locking blocks and multiple second locking blocks are distributed along the axial direction of the push rod.

[0020] Furthermore, the upper end of the sealing housing has an end cap with a sliding hole. The push rod is slidably sealed within the sliding hole. An elastic membrane is provided below the connection point between the sealing housing and the end cap. The middle part of the elastic membrane is connected to the part of the push rod located inside the sealing housing. A return spring is provided on the outer periphery of the push rod. The return spring is used to push the upper part of the push rod out of the sealing housing. The air pressure in the upper cavity of the elastic membrane is greater than the air pressure in the lower cavity of the elastic membrane.

[0021] Furthermore, a sealing plate is provided below the connection position between the sealing housing and the end cap. A through groove is opened at the center of the sealing plate. The outer ring of the elastic membrane is connected to the inner wall of the through groove. A one-way valve is provided on the sealing plate. The one-way valve allows gas in the lower cavity of the elastic membrane to enter the upper cavity of the elastic membrane.

[0022] The beneficial effects of this invention are:

[0023] This invention addresses the issue of sequential contact between the first and second terminals on the active terminal and the two contacts of the normally open and normally closed terminals. This arrangement avoids the synchronous damage to multiple contacts caused by simultaneous contact due to electric arcing. Compared to the traditional method of simultaneous contact, this reduces contact and terminal damage by at least half, extending the lifespan of the microswitch. Furthermore, if one terminal and contact become stuck together due to electric arc welding, the other terminal can still detach normally from the contact because it did not make synchronous contact, ensuring that the circuit can be disconnected in a timely manner and avoiding safety hazards caused by welding.

[0024] This invention achieves "delayed and rapid release" when the terminal contacts the contactor through structures such as a first locking rod, a second locking rod, a first locking block, and a second locking wedge. For example, when the second terminal contacts the contactor first, the first terminal quickly contacts the contactor under the force stored by the tension spring, shortening the arc generation time, reducing the burning time of the arc on the terminal and contactor, and further reducing losses.

[0025] The present invention uses multiple first locking wedges and second locking wedges distributed along the axial direction of the push rod, and the positions of the blocks at both ends of the guide rod can be adjusted to change the tension of the first or second tension spring, thereby adjusting the moving speed of the first or second terminal. In this way, the speed can be adapted according to the circuit voltage. At high voltage, the contact is fast to reduce the arc time, and at low voltage, the contact is slow to avoid mechanical impact damage.

[0026] This invention creates a positive pressure protection system by setting an elastic membrane inside the housing, which separates the upper and lower cavities. The air pressure in the upper cavity of the elastic membrane is greater than that in the outside. Combined with a one-way valve design (which only allows gas from the lower cavity to enter the upper cavity), this system prevents external gases, water, dust, and other impurities from entering the housing and protects the internal electrical components. It is suitable for humid and dusty environments for floodproof doors. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of a protective micro switch for a flood-proof door provided according to an embodiment of the present invention;

[0028] Figure 2 An exploded view of a protective micro switch for a flood-proof door provided according to an embodiment of the present invention;

[0029] Figure 3 for Figure 2 A partial enlarged view of the protective micro switch X portion for a flood-proof door provided in one embodiment;

[0030] Figure 4 for Figure 2 A partial enlarged view of the Y-section of a protective micro switch for a flood-proof door provided in one embodiment;

[0031] Figure 5 for Figure 1 A left view of a protective micro switch for a flood-proof door provided in one embodiment;

[0032] Figure 6 for Figure 5 A cross-sectional view along AA of a protective micro switch for a floodproof door provided in one embodiment;

[0033] Figure 7 for Figure 1 A rear view of a protective micro switch for a flood-proof door provided in one embodiment;

[0034] Figure 8 for Figure 7 A cross-sectional view along BB of a protective micro switch for a floodproof door provided in one embodiment;

[0035] Figure 9 for Figure 8 A partial enlarged view of the Z part of a protective micro switch for a flood-proof door provided in one embodiment;

[0036] Figure 10 This is a schematic diagram of the first switching state of a protective micro switch for a flood-proof door provided in an embodiment of the present invention;

[0037] Figure 11 This is a schematic diagram of the second switching state of a protective micro switch for a flood-proof door provided in an embodiment of the present invention;

[0038] Figure 12 This is a schematic diagram of the third switching state of a protective micro switch for a flood-proof door provided in an embodiment of the present invention.

[0039] in:

[0040] 100. Sealed housing; 110. End cap; 120. Sliding hole; 130. Sealing plate; 140. Check valve; 150. Elastic diaphragm; 160. Normally open terminal; 170. Normally closed terminal;

[0041] 200, push rod; 210, return spring; 220, guide rod; 230, first terminal; 231, first pull rope; 232, first tension spring; 240, second terminal; 241, second pull rope; 242, second tension spring; 250, first elastic element; 260, stop block; 270, sliding groove; 280, first limiting groove; 290, second limiting groove;

[0042] 300, First locking rod; 310, First limiting plate; 320, First push plate; 330, First locking inclined block; 331, First inclined surface; 332, Second inclined surface; 340, Second locking rod; 350, Second limiting plate; 360, Second push plate; 370, Second locking inclined block; 380, Second elastic element. Detailed Implementation

[0043] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0044] The component designations used in this document, such as "first" and "second," are merely for distinguishing the described objects and do not have any sequential or technical meaning. The terms "connection" and "linkage" used in this invention, unless otherwise specified, include both direct and indirect connections (linkages). It should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are used only for the convenience of describing the invention and simplifying the description. They 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 limiting the invention.

[0045] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0046] The following reference Figures 1-12 This invention describes a protective micro switch for flood-proof doors.

[0047] A protective micro switch for flood-proof doors includes a sealed housing 100. The sealed housing 100 contains a normally open terminal 160 and a normally closed terminal 170. The normally open terminal 160 is located above the normally closed terminal 170. Both the normally open terminal 160 and the normally closed terminal 170 have two contacts. A push rod 200 is slidably and sealed on the sealed housing 100. A movable terminal is connected to the push rod 200 and is located between the normally open terminal 160 and the normally closed terminal 170. The movable terminal has a first terminal 230 and a second terminal 240, which correspond vertically to the two contacts on the normally open terminal 160 and the normally closed terminal 170, respectively. The push rod 200 slides vertically, thereby causing the movable terminal to electrically connect with either the normally open terminal 160 or the normally closed terminal 170. In the prior art, when the movable terminal is electrically connected to the normally open terminal 160 or the normally closed terminal 170, the movable terminal moves up and down to drive the first terminal 230 and the second terminal 240 to simultaneously contact the two contacts of the normally open terminal 160 or the normally closed terminal 170. When the terminals and contacts are closed, arcing and welding problems are easily generated. This is mainly due to the release of the magnetic field energy stored in the inductive components (such as coils, motor windings, etc.) in the circuit at the moment the contacts open or close, forming a high voltage in the contact gap that breaks down the air, thereby generating a high-temperature arc. The arc not only causes material wear on the surface of the normally open terminal 160 and the normally closed terminal 170, accelerating contact wear and reducing the service life of the switch, but the excessively high temperature may also cause the contact material to melt and stick together, i.e., welding, causing the micro switch to lose its normal control function and posing a serious safety hazard.

[0048] Based on this, the first terminal 230 and the second terminal 240 on the movable terminal in this invention are not fixedly connected. When the first terminal 230 and the second terminal 240 contact the normally open terminal 160 or the normally closed terminal 170, there will be a sequence. That is, when the push rod 200 drives the movable terminal to be electrically connected to the normally open terminal 160 or the normally closed terminal 170, the first terminal 230 and the second terminal 240 on the movable terminal will contact the two contacts of the normally open terminal 160 or the normally closed terminal 170 in sequence. In other words, the first terminal 230 or the second terminal 240 will first contact one of the contacts of the normally open terminal 160 or the normally closed terminal 170, and then the second terminal 240 or the first terminal 230 will contact the other contact of the normally open terminal 160 or the normally closed terminal 170. When the first terminal 230 or the second terminal 240 contacts one of the normally open terminal 160 or the normally closed terminal 170, no current flows through the circuit. This means that no arc is generated when the first terminal 230 or the second terminal 240 contacts one of the normally open terminal 160 or the normally closed terminal 170. Subsequently, if an arc is generated when the second terminal 240 or the first terminal 230 contacts the other of the normally open terminal 160 or the normally closed terminal 170, it will only cause wear and tear on that terminal and contact, and will not cause wear and tear on the other terminal and contact. This reduces the wear and tear between the terminals and contacts to a certain extent.

[0049] It is understandable that if the first terminal 230 and the second terminal 240 simultaneously contact the two contacts of the normally open terminal 160 or the normally closed terminal 170, the resulting arc will cause wear to occur on the first terminal 230, the second terminal 240, and the two contacts of the normally open terminal 160 or the normally closed terminal 170. However, by setting the two contacts of the normally open terminal 160 or the normally closed terminal 170 to contact sequentially according to the present invention, the wear can be reduced by at least half, thereby improving the overall service life.

[0050] It should be noted that the sequential contact method of the present invention can also avoid the situation where the circuit cannot be disconnected when welding occurs. When the generated arc temperature is too high, causing the first terminal 230 or the second terminal 240 to stick to one of the contacts of the normally open terminal 160 or the normally closed terminal 170, the second terminal 240 or the first terminal 230 and the other contact of the normally open terminal 160 or the normally closed terminal 170 do not generate an arc, and therefore no welding occurs. At this time, the push rod 200 can drive the first terminal 230 or the second terminal 240, which has not undergone welding, to detach from the contact of the normally open terminal 160 or the normally closed terminal 170, thereby disconnecting the circuit and avoiding safety issues.

[0051] Specifically, such as Figure 2 and Figure 4As shown, the present invention has a guide rod 220 vertically arranged between the first terminal 230 and the second terminal 240. The first terminal 230 and the second terminal 240 can slide along the axial direction of the guide rod 220. The middle position of the guide rod 220 is fixedly arranged inside the push rod 200. At the same time, the first terminal 230 and the second terminal 240 are slidably arranged on the push rod 200, and the axes of the guide rod 220 and the push rod 200 are parallel, so that the first terminal 230 and the second terminal 240 can slide smoothly. A first elastic element 250 is also vertically arranged between the first terminal 230 and the second terminal 240. The first elastic element 250 is a compression spring. One end of the first elastic element 250 is fixedly connected to the first terminal 230, and the other end of the first elastic element 250 is fixedly connected to the second terminal 240. The first elastic element 250 can push the first terminal 230 and the second terminal 240 away from each other. Stops 260 are arranged at both ends of the guide rod 220. The two stops 260 are used to restrict the first terminal 230 and the second terminal 240 from disengaging from the guide rod 220.

[0052] It should be noted that, as Figure 10 As shown, when the movable terminal is not connected to the normally open terminal 160 and the normally closed terminal 170, the first terminal 230 and the second terminal 240 on the movable terminal are positioned vertically, with the first terminal 230 located above the second terminal 240. Figure 8 and Figure 9 As shown, the push rod 200 moves upward, causing the first terminal 230 and the second terminal 240 to abut against the two contacts of the normally open terminal 160, respectively. At this time, the first elastic element 250 between the first terminal 230 and the second terminal 240 is in a compressed state. When the first terminal 230 and the second terminal 240 need to contact the two contacts of the normally closed terminal 170, the push rod 200 moves downward, causing the first terminal 230 and the second terminal 240 to move downward. Since the initial position of the first terminal 230 is higher than that of the second terminal 240, when disengaging from the two contacts of the normally open terminal 160, the second terminal 240 will disengage from the contacts first, and the first terminal 230 will disengage from the contacts subsequently under the action of the first elastic element 250. The second terminal 240 will then contact one contact of the normally closed terminal 170, and then the first terminal 230 will contact the other contact of the normally closed terminal 170, thereby preventing the first terminal 230 and the second terminal 240 from contacting the two contacts simultaneously.

[0053] In a further embodiment, such as Figure 2 , Figure 4 and Figure 9As shown, to further reduce the loss caused by the electric arc when the first terminal 230 or the second terminal 240 contacts the normally open terminal 160 and the normally closed terminal 170, the present invention provides a first pull rope 231 between the upper surface of the first terminal 230 and the upper surface of the second terminal 240. A first arc-shaped groove is provided inside the push rod 200, through which the first pull rope 231 passes. A first tension spring 232 is provided between the first pull rope 231 and the upper surface of the second terminal 240, and the first pull rope 231 and the first tension spring 232 elastically connect the upper surface of the first terminal 230 and the upper surface of the second terminal 240 together. Similarly, a second pull rope is provided between the lower surface of the first terminal 230 and the lower surface of the second terminal 240. 241. A second arc-shaped groove is provided inside the push rod 200. The second pull rope 241 passes through the second arc-shaped groove. The position of the second arc-shaped groove through which the second pull rope 241 passes is symmetrical about the center of the guide rod 220 with respect to the position of the first arc-shaped groove through which the first pull rope 231 passes. A second tension spring 242 is provided between the second pull rope 241 and the lower end face of the second terminal 240. The second pull rope 241 and the second tension spring 242 elastically connect the lower end face of the first terminal 230 and the lower end face of the second terminal 240. A locking assembly is provided inside the push rod 200. The locking assembly is configured to delay the release of the second terminal 240 or the first terminal 230 when the first terminal 230 or the second terminal 240 contacts the normally open terminal 160 or the normally closed terminal 170.

[0054] It is understandable, such as Figure 8 Status to Figure 10 As shown in the diagram, push rod 200 moves downward, causing first terminal 230 and second terminal 240 to move downward. Second terminal 240 disengages from the contact of normally open terminal 160. Subsequently, first terminal 230 also disengages from the contact of normally open terminal 160. The first elastic element 250 on first terminal 230 and second terminal 240 returns to its original length. Both first terminal 230 and second terminal 240 are locked onto push rod 200 by locking components. First terminal 230 and second terminal 240 can only disengage from the locking components under significant external force. Figure 11As shown, as the push rod 200 continues to move downward, the second terminal 240 gradually approaches the contact of the normally closed terminal 170. When the second terminal 240 approaches the contact of the normally closed terminal 170, under the pushing action of the push rod 200, the second terminal 240 disengages from the locking assembly, causing the second terminal 240 to slide upward relative to the guide rod 220. The second pull rope 241 pulls the second tension spring 242, stretching the second tension spring 242. The other end of the second tension spring 242 pulls the lower end of the first terminal 230. Terminal 30 is locked by the locking assembly, and the tension of the second tension spring 242 cannot release the locking assembly. Therefore, as the push rod 200 moves downward, the second tension spring 242 begins to store force. When the push rod 200 moves a preset distance, the locking assembly releases the locking assembly from locking the first terminal 230. At this time, the first terminal 230 moves downward rapidly under the pulling action of the second tension spring 242, thereby contacting the contact of the normally closed terminal 170. This reduces the time for arc generation, thereby reducing the wear of the arc on the contacts of the first terminal 230 and the normally open terminal 160.

[0055] Specifically, such as Figure 2 , Figure 3 and Figure 9 As shown, the locking assembly of the present invention includes a first locking rod 300, a second locking rod 340, a first locking wedge 330, and a second locking wedge 370. Both the first locking rod 300 and the second locking rod 340 are slidably disposed inside the push rod 200. A sliding groove 270 is provided inside the push rod 200, extending axially along the push rod 200. Limiting grooves are alternately provided at the middle positions of the sliding grooves 270. For ease of description, the two limiting grooves are named the first limiting groove 280 and the second limiting groove 290, respectively. The first limiting groove 280 corresponds to the first locking rod 300, and the second limiting groove 290 corresponds to the second locking rod 340. The position of the second limiting groove 290 is higher than the position of the first limiting groove 280. Both the first locking rod 300 and the second locking rod 340 are slidably disposed within the sliding groove 270. Figure 3As shown, the first locking rod 300 is located above the second locking rod 340. A first limiting plate 310 is provided on the end of the first locking rod 300 near the second locking rod 340, and a second limiting plate 350 is provided on the end of the second locking rod 340 near the first locking rod 300. The second limiting plate 350 is slidably disposed within the first limiting groove 280, and the first limiting plate 310 is slidably disposed within the second limiting groove 290, with a portion extending out of both grooves. The extended portion of the first limiting plate 310 can contact the lower end face of the first terminal 230, and the extended portion of the second limiting plate 350 can contact the upper end face of the second terminal 240. A second elastic element 380, which is a tension spring, is connected to the ends of the first locking rod 300 and the second locking rod 340 that are close to each other. The second elastic element 380 can pull the first locking rod 300 and the second locking rod 340 closer together.

[0056] like Figure 8 and Figure 9 As shown, limiting grooves are provided on both the first terminal 230 and the second terminal 240. The first locking oblique block 330 and the second locking oblique block 370 of the present invention are slidably disposed inside the push rod 200. The sliding direction of the first locking oblique block 330 and the second locking oblique block 370 is perpendicular to the sliding direction of the first locking rod 300 and the second locking rod 340. When the first locking oblique block 330 is located in the limiting oblique groove of the first terminal 230, the first locking oblique block 330 restricts the first terminal 230 from sliding inside the push rod 200. Similarly, when the second locking oblique block 370 is located in the limiting oblique groove of the second terminal 240, the second locking oblique block 370 restricts the second terminal 240 from sliding inside the push rod 200. The arrangement of the first locking oblique block 330 and the second locking oblique block 370 can restrict the first terminal 230 and the second terminal 240 inside the push rod 200, so that the first terminal 230 and the second terminal 240 move synchronously with the push rod 200.

[0057] Specifically, such as Figure 3 , Figure 8 and Figure 9As shown, to enable the first locking ramp 330 and the second locking ramp 370 to have locking and unlocking functions, a first push plate 320 and a second push plate 360 ​​are slidably disposed in the sliding groove 270 of the push rod 200. Two connecting grooves perpendicular to the extending direction of the sliding groove 270 are formed in the sliding groove 270. The first push plate 320 and the second push plate 360 ​​are respectively located in the two connecting grooves, such that the sliding direction of the first push plate 320 and the second push plate 360 ​​is perpendicular to the sliding direction of the first locking rod 300 and the second locking rod 340. Wedge-shaped surfaces are provided on the ends of the first locking rod 300 and the second locking rod 340 that are far apart from each other. The narrow ends of the two wedge-shaped surfaces approach each other, and the two wedge-shaped surfaces slide in contact with the first push plate 320 and the second push plate 360 ​​respectively. When the first locking rod 300 and the second locking rod 340 approach each other... The first push plate 320 and the second push plate 360 ​​can be moved by the two wedge-shaped surfaces. The first locking wedge block 330 and the second locking wedge block 370 in this invention are respectively on the first push plate 320 and the second push plate 360. The first locking wedge block 330 and the second locking block each have two inclined surfaces. For ease of description, the two inclined surfaces are named the first inclined surface 331 and the second inclined surface 332, respectively. The inclination of the first inclined surface 331 is less than that of the second inclined surface 332. The first inclined surface 331 on the first locking wedge block 330 is located on the upper end surface of the first locking wedge block 330, and the second inclined surface 332 is located on the lower end surface of the first locking wedge block 330. The first inclined surface 331 on the second locking wedge block 370 is located on the lower end surface of the second locking wedge block 370, and the second inclined surface 332 is located on the upper end surface of the second locking wedge block 370.

[0058] It is understandable that the first push plate 320 and the second push plate 360 ​​can push out the first locking ramp 330 and the second locking ramp 370, so that the first locking ramp 330 and the second locking ramp 370 enter the limiting ramp groove of the first terminal 230 and the second terminal 240 through the second ramp 332. When the first locking ramp 330 and the second locking ramp 370 disengage from the limiting ramp groove, they need to pass through the first ramp 331. Since the inclination of the second ramp 332 is greater than that of the first ramp 331, the force required for the first locking ramp 330 and the second locking ramp 370 to enter the limiting ramp groove is less than the force required for the first locking ramp and the second locking ramp to disengage from the limiting ramp groove. In other words, the first locking ramp 330 or the second locking ramp 370 can enter the limiting ramp groove more easily, but it is more difficult to disengage from the limiting ramp groove.

[0059] It should be noted that, as Figures 8-12As shown, in this embodiment, during the process of the active terminal disengaging from the two contacts of the normally open terminal 160 to contact the two contacts of the normally closed terminal 170, the push rod 200 moves downward. Under the action of the first elastic member 250, the second terminal 240 moves downward relative to the push rod 200, thereby disengaging from one contact of the normally open terminal 160. The upper end of the second terminal 240 disengages from the first limiting plate 310 of the first locking rod 300. Under the action of the second elastic member 380, the first limiting plate 310 moves downward, thereby pushing the first push plate 320. The first push plate 320 pushes out the first locking ramp 330. When the second terminal 240 moves downward to the lower end of the guide rod 220, the limiting ramp on the second terminal 240 approaches the position of the second locking ramp 370, and the second ramp 332 of the second locking ramp 370 easily engages with the limiting ramp of the second terminal 240. Simultaneously, as the push rod 200 moves downward, the first terminal 230 moves upward relative to the push rod 200 under the action of the first elastic member 250. The lower end of the first terminal 230 disengages from the second limiting plate 350 of the second locking rod 340. The second locking rod 340 moves upward under the action of the second elastic member 380. The second locking rod 340 pushes the second push plate 360 ​​to push out the second locking wedge block 370, thereby locking the second terminal 240. As the push rod 200 continues to move downwards, the limiting groove on the first terminal 230 gradually approaches the second inclined surface 332 of the first locking block 330. Due to the large inclination of the second inclined surface 332, the first locking block 330 can be easily pushed inwards by the action of the first elastic member 250. The first push plate 320 overcomes the tension of the second elastic member 380 under the action of the wedge-shaped surface of the first locking rod 300, thereby making the limiting groove of the first terminal 230 correspond to the position of the first locking block 330. At this time, the first terminal 230 has moved to the upper limit position of the guide rod 220, thereby allowing the first locking block 330 to enter the limiting groove of the first terminal 230, forming a... Figure 10 The state shown.

[0060] like Figure 11As shown, at this time, the first terminal 230 and the second terminal 240 move downward synchronously with the push rod 200. When the second terminal 240 contacts one contact of the normally closed terminal 170, the push rod 200 continues to move downward, causing the limiting groove on the second terminal 240 to disengage from the second locking block 370. After disengaging from the second locking block 370, the second terminal 240 moves upward relative to the push rod 200. Since the first terminal 230 is only subjected to the force of the second tension spring 242 at this time, the second tension spring 242 cannot overcome the action of the first inclined surface 331 on the first locking block 330. The second tension spring 242 is continuously stretched and stores force. When the upper end face of the second terminal 240 contacts the first limiting plate 310 of the first locking rod 300 and pushes the first locking rod 300 to move upward, the wedge-shaped surface on the first locking rod 300 disengages from the pressure on the first push plate 320. The first locking oblique block 330 on the first push plate 320 instantly disengages from the limiting oblique groove on the first terminal 230. At this time, the first terminal 230 quickly contacts one of the normally closed terminals 170 under the action of the second tension spring 242, thereby reducing the time for arc generation.

[0061] When the movable terminal disengages from the normally closed terminal 170 and contacts the normally open terminal 160, the push rod 200 moves upward, and the movement process of the first terminal 230 and the second terminal 240 is the reverse of the above process, which will not be described in detail here.

[0062] In a further embodiment, such as Figure 3 , Figure 4 and Figure 7As shown, the present invention has multiple first locking ramps 330 and multiple second locking ramps 370. These multiple first locking ramps 330 and multiple second locking ramps 370 are distributed along the axial direction of the push rod 200. The positions of the stops 260 at both ends of the guide rod 220 are adjustable, thereby allowing adjustment of the upper limit position of the first terminal 230 and the lower limit position of the second terminal 240. The positions of the stops 260 at both ends of the guide rod 220 are related to the positions of the first locking ball and the second locking ball. In this embodiment, there are three first locking ramps 330 and three second locking ramps 370, so there are three speed settings for adjusting the movement speed of the first terminal 230 or the second terminal 240. For example, when the first terminal 230 or the second terminal 240 needs to reach its fastest speed, the stops 260 at both ends of the guide rod 220 are moved to the position corresponding to the outermost position of the first locking ramp 330 and the second locking ramp 370, that is, the uppermost first locking ramp 330 and the lowermost second locking ramp 370. At the corresponding position of the anti-tilt block 370, the greater the degree of stretching of the first tension spring 232 or the second tension spring 242, the faster the second terminal 240 or the first terminal 230 moves. When the stops 260 at both ends of the guide rod 220 correspond to the lowermost first locking tilt block 330 and the uppermost second locking tilt block 370 respectively, the less the degree of stretching of the first tension spring 232 or the second tension spring 242, the slower the movement speed of the second terminal 240 or the first terminal 230. Thus, the movement speed of the first terminal 230 or the second terminal 240 can be adjusted according to the voltage in the circuit. If the voltage in the circuit is high, the first terminal 230 and the second terminal 240 need to move faster. If the voltage in the circuit is low, the movement speed of the first terminal 230 or the second terminal 240 needs to be slowed down. This prevents the first terminal 230 or the second terminal 240 from striking the two contacts of the normally closed terminal 170 or the normally open terminal 160 at a high speed when the voltage in the circuit is low.

[0063] It is understandable that when the voltage in the circuit is low, the generated arc temperature is low, and the loss to the first terminal 230 or the second terminal 240 is small. If a faster speed is still used to contact the two contacts of the normally closed terminal 170 or the normally open terminal 160, the faster speed will be converted into greater potential energy, which will lead to an increase in the loss to the first terminal 230 or the second terminal 240. Therefore, when the present invention is applied in a low voltage environment, the moving speed of the first terminal 230 or the second terminal 240 is slowed down to reduce the loss. However, when applied in a high voltage environment, the generated arc temperature is high, and the loss to the first terminal 230 or the second terminal 240 is greater. Therefore, a faster speed is used to reduce the time that the arc takes to wear down the first terminal 230 or the second terminal 240.

[0064] In a further embodiment, such as Figure 6 and Figure 8As shown, the sealing housing 100 of the present invention has a protective function. An end cap 110 is provided on the sealing housing 100, and a sliding hole 120 is provided on the end cap 110. The push rod 200 is slidably sealed in the sliding hole 120. An elastic membrane 150 is provided inside the sealing housing 100. The elastic membrane 150 is located below the connection position between the sealing housing 100 and the end cap 110. The elastic membrane 150 divides the space between the end cap 110 and the sealing housing 100 into upper and lower cavities. The elastic membrane 150 is connected to the push rod 200. When the push rod 200 moves downward, it can reduce the air pressure in the lower cavity of the elastic membrane 150. When the elastic membrane 150 moves upward, it can increase the air pressure in the upper cavity of the elastic membrane 150. Since the elastic membrane 150 is located at the lower end of the connection between the end cap 110 and the sealing housing 100, and the push rod 200 is slidably sealed to the end cap 110, the connection between the end cap 110 and the sealing housing 100 and the connection between the push rod 200 and the end cap 110 are prone to poor sealing. Therefore, the present invention provides an elastic membrane 150 inside the housing, and the air pressure in the upper cavity of the elastic membrane 150 is greater than the external air pressure, thereby preventing external gas, water or other dust from entering the end cap 110 and the sealing housing 100, thus providing a protective function.

[0065] Specifically, such as Figure 6 and Figure 8 As shown, the sealing housing 100 of the present invention is provided with a sealing plate 130 inside. A through groove is provided at the center of the sealing plate 130. The through groove is used to fit the push rod 200. The diameter of the through groove is larger than the diameter of the push rod 200. The outer ring of the elastic membrane 150 is connected to the inner circumference of the through groove. The inner ring of the elastic membrane 150 is fixedly connected to the push rod 200. A return spring 210 is provided at the connection position between the push rod 200 and the elastic membrane 150. The return spring 210 is used to push the push rod 200 to move upward. To allow the push rod 200 to change the air pressure in the cavities at both ends of the elastic diaphragm 150 by moving up and down, a one-way valve 140 is provided on the sealing plate 130. The one-way valve 140 only allows gas to enter the upper cavity of the elastic diaphragm 150 from the lower cavity. Therefore, when the push rod 200 moves downward, the volume of the lower cavity of the elastic diaphragm 150 decreases, and gas enters the upper cavity of the elastic diaphragm 150 from the one-way valve 140. Subsequently, when the push rod 200 moves upward, the volume of the upper cavity of the elastic diaphragm 150 decreases, but the gas in the upper cavity of the elastic diaphragm 150 cannot pass through the one-way valve 140. Therefore, the air pressure inside the upper cavity of the elastic diaphragm 150 is relatively high and is greater than the external air pressure, thereby preventing external gas, water, or other impurities from entering the sealed housing 100.

[0066] The specific working process of a protective micro switch for flood-proof doors provided by the present invention will be described in conjunction with the above embodiments:

[0067] Install:

[0068] During installation, the distance between the stops 260 at both ends of the guide rod 220 needs to be adjusted according to the voltage in the circuit, thereby adjusting the distance between the first terminal 230 and the second terminal 240. This ensures that the length of the tension spring on the first terminal 230 or the second terminal 240 is positively correlated with the voltage in the circuit. For example, in this embodiment, the circuit voltage is relatively high, requiring the first terminal 230 or the second terminal 240 to contact the contacts at a faster speed. The two stops 260 on the guide rod 220 are adjusted to correspond to the outermost first locking ramp 330 and the second locking ramp 370 of the first push plate 320 and the second push plate 360, that is, to correspond to the positions of the uppermost first locking ramp 330 and the lowermost second locking ramp 370.

[0069] Normally open state:

[0070] The first terminal 230 and the second terminal 240 inside the sealed housing 100 are in contact with the two contacts of the normally open terminal 160, and the state at this time is as follows. Figure 8 and Figure 9 As shown, the return spring 210 on the push rod 200 has a certain pushing force, which keeps the push rod 200 in contact with the two contacts of the first terminal 230 and the second terminal 240 and the normally open terminal 160. At this time, the first elastic member 250 between the first terminal 230 and the second terminal 240 is in a compressed state, and the first limiting plate 310 on the first locking rod 300 is in contact with the upper end of the second terminal 240, and the second limiting plate 350 of the second locking rod 340 is in contact with the lower end of the first terminal 230. The first locking rod 300 and the second locking rod 340 are far apart from each other, so as not to push the first push plate 320 and the second push plate 360.

[0071] When switching states:

[0072] When it is necessary to switch from the normally open state to the normally closed state, the push rod 200 is subjected to a downward force, the return spring 210 on the push rod 200 is compressed, and the first terminal 230 and the second terminal 240 on the push rod 200 will gradually separate from the two contacts of the normally open terminal 160 and move closer to the two contacts of the normally closed terminal 170. The second terminal 240 will first separate from one of the contacts of the normally open terminal 160, and the upper end of the second terminal 240 will separate from the contact with the first limiting plate 310, thereby causing the first locking rod 300 to move downward under the action of the second elastic member 380. The first locking rod 300 pushes the first push plate 320, and the first push plate 320 pushes out the three locking ramps above it. When the second terminal 240 moves to contact the stop 260 at the lower end of the guide rod 220, it stops moving. At this time, the limiting ramp on the second terminal 240 approaches the lowermost second locking ramp 370.

[0073] Simultaneously, when the push rod 200 moves downward, the first terminal 230 moves upward relative to the push rod 200 under the action of the first elastic member 250. The lower end of the first terminal 230 disengages from the second limiting plate 350 of the second locking rod 340. The second limiting plate 350 moves upward under the action of the second elastic member 380, thereby causing the second locking rod 340 to push the second push plate 360. The second push plate 360 ​​pushes out the second locking inclined block 370, thereby pushing the second locking inclined block 370 into the limiting inclined groove on the second terminal 240. When terminal 230 moves upward relative to push rod 200, it easily passes through the second inclined surface 332 of first locking inclined block 330 under the action of first elastic element 250, so that the limiting inclined groove on first terminal 230 engages with the uppermost first locking inclined block 330. At this time, first terminal 230 moves to contact the upper end stop 260 of guide rod 220. First terminal 230 and second terminal 240 move synchronously with push rod 200 through the restriction of first locking inclined block 330 and second locking inclined block 370, forming a... Figure 10 The state shown.

[0074] When the second terminal 240 contacts one of the normally closed terminals 170, the downward force of the push rod 200 overcomes the force between the first inclined surface 331 on the second locking block 370 and the limiting groove of the second terminal 240, causing the second terminal 240 to disengage from the second locking block 370. The push rod 200 continues to move downward, and at this time, the second terminal 240 moves upward relative to the push rod 200. Since the first terminal 230 is restricted by the first locking block 330, and the force of the second tension spring 242 cannot overcome the force between the first inclined surface 331 and the limiting groove of the first locking block 330, the second pull rope 241 on the second terminal 240 pulls the second tension spring 242, stretching it. The second tension spring 242 gradually stores force, forming a... Figure 11 As shown, when the upper end of the second terminal 240 pushes the first limiting plate 310 of the first locking rod 300 upward, the wedge-shaped surface of the first locking rod 300 disengages from pushing the first push plate 320, and the first locking oblique block 330 on the first push plate 320 releases its restriction on the first terminal 230. Under the action of the second tension spring 242, the first terminal 230 is quickly released and thus quickly contacts one of the contacts of the normally closed terminal 170, avoiding the arcing time being too long and thus aggravating the wear of the first terminal 230 and the contact.

[0075] Similarly, when the push rod 200 moves upward under the action of the return spring 210, the movement process of the first terminal 230 and the second terminal 240 is the same as the above process, but in the opposite direction, which will not be described in detail here. When the push rod 200 moves downward, it can drive the elastic diaphragm 150 to squeeze the cavity at the lower end of the elastic diaphragm 150. The gas in the cavity at the lower end of the elastic diaphragm 150 will enter the cavity at the upper end of the elastic diaphragm 150 through the one-way valve 140 on the sealing plate 130. When the push rod 200 moves upward, the elastic diaphragm 150 compresses the gas in the cavity at the upper end of the elastic diaphragm 150. The gas pressure in the cavity at the upper end of the elastic diaphragm 150 is greater than the external air pressure, so it can play a protective role and prevent external gas, water or dust impurities from entering the sealing housing 100.

[0076] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0077] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are somewhat descriptive and detailed, they should not be construed as limiting the scope of the invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the appended claims.

Claims

1. A protective micro switch for flood-proof doors, characterized in that, include: A sealed housing, wherein normally open terminals and normally closed terminals are fixedly disposed inside the sealed housing, and each normally open terminal and normally closed terminal has two contacts; A push rod is slidably and sealed on the sealing housing. A movable terminal is provided on one end of the push rod inside the sealing housing. The movable terminal is located between the normally open terminal and the normally closed terminal. The movable terminal has a first terminal and a second terminal. The first terminal and the second terminal are configured to contact the two contacts of the normally open terminal or the normally closed terminal sequentially when the movable terminal is electrically connected to the normally open terminal or the normally closed terminal. A guide rod is vertically arranged between the first terminal and the second terminal. The first terminal and the second terminal are slidably arranged on the outer periphery of the guide rod along the axial direction of the guide rod. The axis of the guide rod is parallel to the axis of the push rod. A first elastic element is vertically arranged between the first terminal and the second terminal. The first elastic element is used to push the first terminal and the second terminal away from each other. A first pull rope is provided between the upper end face of the first terminal and the upper end face of the second terminal. The first pull rope is wound inside the push rod. A first tension spring is provided between the first pull rope and the upper end face of the second terminal. A second pull rope is provided between the lower end face of the first terminal and the lower end face of the second terminal. The second pull rope is wound inside the push rod. A second tension spring is provided between the second pull rope and the lower end face of the first terminal. The push rod is provided with a locking component, which is configured to delay and quickly release the second terminal or the first terminal when the first terminal or the second terminal contacts the normally open terminal or the normally closed terminal; The locking assembly includes a first locking rod, a second locking rod, a first locking ramp, and a second locking ramp. The first locking rod and the second locking rod are slidably disposed inside the push rod. A second elastic element is disposed between the first locking rod and the second locking rod, and the second elastic element is used to pull the first locking rod and the second locking rod closer to each other. The first locking ramp and the second locking ramp are slidably disposed inside the push rod. Both the first locking ramp and the second locking ramp are provided with a first inclined surface and a second inclined surface. The inclination of the second inclined surface is greater than that of the first inclined surface. Limiting grooves are formed on both the first terminal and the second terminal.

2. The protective micro switch for flood-proof doors according to claim 1, characterized in that, The sliding directions of the first locking ramp and the second locking ramp are perpendicular to the sliding directions of the first locking rod and the second locking rod.

3. The protective micro switch for flood-proof doors according to claim 1, characterized in that, The first inclined surface on the first locking ramp is located above the second inclined surface, and the second inclined surface on the second locking ramp is located above the first inclined surface.

4. The protective micro switch for flood-proof doors according to claim 1, characterized in that, Both the first locking rod and the second locking rod have wedge-shaped surfaces at their far ends, with the narrow ends of the two wedge-shaped surfaces close to each other. The push rod has a first push plate and a second push plate slidably disposed inside it. The first push plate and the second push plate are respectively connected to the first locking ramp and the second locking ramp. The wedge-shaped surfaces on the first locking rod and the second locking rod slide against the first push plate and the second push plate.

5. The protective micro switch for flood-proof doors according to claim 4, characterized in that, There are multiple first locking blocks and multiple second locking blocks, and the multiple first locking blocks and multiple second locking blocks are distributed along the axial direction of the push rod.

6. The protective micro switch for flood-proof doors according to claim 1, characterized in that, The sealing housing has an end cap at its upper end, and a sliding hole is provided on the end cap. The push rod is slidably sealed in the sliding hole. An elastic membrane is provided below the connection position between the sealing housing and the end cap. The middle part of the elastic membrane is connected to the part of the push rod located inside the sealing housing. A return spring is provided on the outer periphery of the push rod. The return spring is used to push the upper part of the push rod out of the sealing housing. The air pressure in the upper cavity of the elastic membrane is greater than the air pressure in the lower cavity of the elastic membrane.

7. The protective micro switch for flood-proof doors according to claim 6, characterized in that, A sealing plate is provided below the connection position between the sealing housing and the end cap. A through groove is opened at the center of the sealing plate. The outer ring of the elastic membrane is connected to the inner wall of the through groove. A one-way valve is provided on the sealing plate. The one-way valve allows gas in the lower cavity of the elastic membrane to enter the upper cavity of the elastic membrane.

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