Single-pole double-throw microswitch

Abstract

The utility model belongs to the technical field of micro-switches, and particularly discloses a single-pole double-throw micro-switch, which comprises a fixed contact assembly comprising a first port contact and a second port contact; the switching contact is arranged between the first port contact and the second port contact, and the switching contact has a first working state in which the switching contact is in contact with the first port contact and a second working state in which the switching contact is in contact with the second port contact; the switching mechanism comprises a switching block and a switching piece, the switching block is elastically connected with the switching piece, the switching contact is arranged on the switching piece, and the switching block can be used for driving the switching contact to swing and driving the switching point to be switched between the first working state and the second working state. According to the utility model, the switch is prevented from being closed by mistaken touch under the condition of frequent vibration, the possibility of mistaken touch of the microswitch is reduced, and the overall anti-vibration performance of the microswitch is improved.

Description

Technical Field

[0001] This utility model relates to the field of micro switch technology, and in particular to a single-pole double-throw micro switch. Background Technology

[0002] A single-pole double-throw micro switch is a switching device with one moving contact and two stationary contacts. It has a small contact interval, fast response, and supports multiple functions such as signal switching, limit control, and status detection. It has mature applications in industrial, automotive, and medical fields.

[0003] Chinese Patent No. CN203406188U discloses a small single-pole double-throw micro switch, which includes a base, a reed assembly, and upper / lower contacts that form normally closed / normally open contacts with the reed assembly. The reed assembly includes a reed, a spring, and a transmission rod, with the reed disposed between the transmission rod and the spring. Cover plates are provided on both sides of the base, and a pressure rod is hinged between the two cover plates to limit and apply force to the transmission rod in the reed assembly. Existing single-pole double-throw micro switches generally use the elastic action of a reed to switch the position of a common contact to change the switching state.

[0004] For special environments, such as the nuclear power field, microswitches are required to have properties such as high temperature resistance, radiation resistance, and earthquake resistance, and to be reliable over a long period of time. However, existing microswitches are designed without a design margin, making them prone to false triggering under strong vibration and earthquake conditions, and therefore unreliable for use in the nuclear power field. In view of this, the applicant has proposed a single-pole double-throw microswitch. Utility Model Content

[0005] In view of the shortcomings of the prior art described above, the purpose of this utility model is to provide a single-pole double-throw micro switch to solve the problem of insufficient shock resistance of the existing single-pole double-throw micro switch.

[0006] To achieve the above and other related objectives, this utility model provides a single-pole double-throw micro switch, comprising:

[0007] A fixed contact assembly, the fixed contact assembly including a first port contact and a second port contact;

[0008] A switching contact is disposed between a first port contact and a second port contact. The switching contact has a first working state in contact with the first port contact and a second working state in contact with the second port contact.

[0009] A switching mechanism includes a switching block and a switching plate. The switching block is elastically connected to the switching plate. The switching contact is disposed on the switching plate. The switching block can be used to drive the switching contact to swing and to drive the switching contact to switch between a first working state and a second working state.

[0010] Optionally, the switching mechanism further includes a common terminal, the switching block and the switching piece are both fixed on the common terminal, an elastic element is provided between the switching block and the common terminal, and the switching block and the switching piece respectively abut against the common terminal through the elastic element.

[0011] Optionally, the common terminal is provided with a first slot, the conversion block is provided with a block, the block and the first slot have a first abutting part that abuts against each other, and the conversion block can swing around the first abutting part.

[0012] Optionally, the common terminal is provided with a second slot, the switching plate is provided with a connecting part, the connecting part and the second slot have a second abutting part that abuts against each other, and the switching plate can swing around the second abutting part.

[0013] Optionally, the single-pole double-throw micro switch further includes a housing assembly and a button, wherein the fixed contact assembly, the switching contact, and the switching mechanism are all disposed within the housing assembly.

[0014] Optionally, the housing assembly includes an outer shell, an inner shell, and a base, with the base disposed at the bottom of the outer shell, and the inner shell disposed inside the outer shell and abutting against the base.

[0015] Optionally, the single-pole double-throw micro switch further includes a button, the inner shell is provided with a clearance opening, and the bottom of the button is provided with a trigger rod that can pass through the clearance opening. The trigger rod can be used to drive the switching block to swing.

[0016] Optionally, the inner shell is provided with a reset rod, the button is provided with a reset groove, and a reset spring is sleeved on the reset rod and passes through the reset groove.

[0017] Optionally, the inner shell is provided with a plurality of guide holes, and the bottom of the button is provided with a guide rod corresponding to the guide holes, the guide rod being inserted into the guide holes.

[0018] Optionally, the single-pole double-throw micro switch further includes a first terminal and a second terminal, the first port contact is disposed on the first terminal, the second port contact is disposed on the second terminal, the base is provided with a first slot, a second slot and a third slot, the first terminal is fixedly connected to the first slot, the second slot is fixedly connected to the second terminal, and the common terminal is fixedly connected to the third slot.

[0019] As described above, the single-pole double-throw micro switch proposed in this utility model has the following beneficial effects:

[0020] In this invention, by setting a fixed contact component and a switching contact, the position of the switching contact can be changed under the action of the switching mechanism to realize the first working state and the second working state of the switching contact. The switching mechanism adopts a combination of a switching block and a switching plate, and the two are elastically connected, so that the switching contact needs to reach a certain pressure condition to swing and realize the switching of working state. Compared with the prior art, this invention has high shock resistance in special fields, such as nuclear power environment and working environment with frequent vibration, reduces the possibility of false contact of micro switch, and improves the overall performance of micro switch. Attached Figure Description

[0021] Figure 1 The diagram shown is a structural schematic diagram of an embodiment of the present utility model;

[0022] Figure 2 The diagram shown is a structural cross-sectional view of an embodiment of the present invention.

[0023] Figure 3 The diagram shown is a schematic representation of the internal structure of an embodiment of the present invention.

[0024] Figure 4 The diagram shown is a structural schematic of the base in one embodiment of the present invention.

[0025] Figure 5 This is a schematic diagram of another structure of the base in one embodiment of the present invention;

[0026] Figure 6 The diagram shown is a structural schematic of the switching mechanism in one embodiment of the present invention.

[0027] Figure 7 The diagram shows the connection structure of the conversion block and the switching plate in one embodiment of the present invention.

[0028] Figure 8 The diagram shown is a structural schematic of the conversion block in one embodiment of this utility model.

[0029] Explanation of reference numerals in the attached figures:

[0030] Outer shell 1, inner shell 2, clearance opening 201, guide hole 202, reset rod 203, reset spring 204, button 3, reset groove 303, trigger rod 301, guide rod 302, base 4, first terminal 5, second terminal 6, first port contact 7, second port contact 8, common terminal 9, first slot 901, second slot 902, first abutting part 903, second abutting part 904, conversion block 10, locking block 1001, contact part 1002, switching piece 11, mounting hole 1101, switching contact 12, elastic element 13, first connecting end 1301, second connecting end 1302. Detailed Implementation

[0031] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model.

[0032] It should be noted that the illustrations provided in this embodiment are only schematic representations of the basic concept of this utility model. Therefore, the drawings only show components related to this utility model and are not drawn according to the actual number, shape, and size of the components in implementation. In actual implementation, the form, quantity, and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex. The structures, proportions, sizes, etc., shown in the accompanying drawings are only used to complement the content disclosed in the specification for those skilled in the art to understand and read, and are not intended to limit the implementation conditions of this utility model. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportional relationships, or adjustments to the size, without affecting the effects and purposes that this utility model can produce, should still fall within the scope of the technical content disclosed in this utility model. Meanwhile, the terms such as "upper", "lower", "left", "right", "middle" and "one" used in this specification are only for clarity of description and are not intended to limit the scope of implementation of this utility model. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered as within the scope of implementation of this utility model.

[0033] like Figures 1-8 As shown, this utility model proposes a single-pole double-throw micro switch.

[0034] In one exemplary embodiment, a single-pole double-throw micro switch includes:

[0035] A fixed contact assembly, comprising a first port contact 7 and a second port contact 8;

[0036] Switching contact 12 is disposed between first port contact 7 and second port contact 8. Switching contact 12 has a first working state in contact with first port contact 7 and a second working state in contact with second port contact 8.

[0037] The switching mechanism includes a switching block 10 and a switching plate 11. The switching block 10 and the switching plate 11 are elastically connected. The switching contact 12 is disposed on the switching plate 11. The switching block 10 can be used to drive the switching contact 12 to swing and to drive the switching contact to switch between a first working state and a second working state.

[0038] In this embodiment, the fixed contact assembly and the switching contact 12 are configured so that the position of the switching contact 12 can be changed under the action of the switching mechanism to realize the first working state and the second working state of the switching contact 12. The switching mechanism adopts a combination of the switching block 10 and the switching plate 11, and the two are elastically connected, so that the switching contact 12 needs to reach a certain pressure condition to swing and realize the switching of the working state. Compared with the prior art, this utility model has high shock resistance in special fields, such as nuclear power environment and working environment with frequent vibration, reduces the possibility of false contact of micro switch, and improves the overall performance of micro switch.

[0039] For example, the micro switch in this embodiment is a normally open micro switch. Correspondingly, the first port contact 7 is a normally open contact, the second port contact 8 is a normally closed contact, and the switching contact 12 is in contact with the normally open contact under normal circumstances, so the micro switch is in the normally open state. When it needs to be closed, the working state of the micro switch is switched by the switching mechanism to switch it to the second working state, and the switching contact 12 is in contact with the normally closed contact, so the micro switch is closed.

[0040] For example, the micro switch in this embodiment can also be a normally closed micro switch. Correspondingly, the first port contact 7 is a normally closed contact, the second port contact 8 is a normally open contact, and the switching contact 12 is in contact with the normally closed contact under normal circumstances, so the micro switch is in a normally closed state. When it needs to be opened, the working state of the micro switch is switched by the switching mechanism to switch it to the second working state, and the switching contact 12 is in contact with the normally open contact, so the micro switch is opened.

[0041] It is worth noting that in this embodiment, the first working state can be adaptively set to either normally open or normally closed according to the user's specific needs in order to achieve the required function.

[0042] It should also be noted that in this embodiment, the first port contact 7 and the second port contact 8 are located on the upper and lower sides of the switching contact 12, respectively.

[0043] In an exemplary embodiment, the switching mechanism further includes a common terminal 9, and the switching block 10 and the switching piece 11 are both fixed on the common terminal 9. An elastic element 13 is provided between the switching block 10 and the common terminal 9, and the switching block 10 and the switching piece 11 respectively abut against the common terminal 9 through the elastic element 13.

[0044] like Figures 3-8 As shown, in this embodiment, the common terminal 9 provides an installation environment for the conversion block 10 and the switching piece 11. The conversion block 10 and the switching piece 11 are fixed to the common terminal 9 by the stretching action of the elastic member 13. The connection method is abutting connection. Under the stretching action of the elastic member 13, the common terminal 9, the conversion block 10 and the switching piece 11 achieve force balance.

[0045] For example, in this embodiment, a mounting hole 1101 is opened on the switching plate 11, and a pair of contact portions 1002 are provided on the conversion block 10. The elastic element 13 is a tension spring. One end of the tension spring passes through the mounting hole 1101, and the other end passes through the gap between the contact portions 1002. Therefore, the two ends of the tension spring pull the switching plate 11 and the conversion block 10 respectively, and the tension spring generates the first tension state. At this time, the tension spring applies a force from the lower left to the upper right to the switching plate 11. The switching plate 11 is in an inclined state, and the switching contact 12 installed on the switching plate 11 is raised and contacts the first port contact 7 to realize the normally open / normally closed state of the micro switch. In a specific embodiment, the tension spring has a first connecting end 1301 connected to the conversion block 10 and a second connecting end 1302 connected to the switching plate 11. In the natural state where the conversion block 10 is not under force, the horizontal height of the first connecting end 1301 is higher than the horizontal height of the second connecting end 1302. This setting can increase the descent margin of the conversion block 10. The conversion block 10 needs to descend a greater height to drive the switching contact 12 on the switching plate 11 to move to contact the second port contact 8, thereby improving the shock resistance of this application.

[0046] In some embodiments, the common terminal 9 is provided with a first slot 901, and the conversion block 10 is provided with a locking block 1001. The locking block 1001 and the first slot 901 have a first abutting portion 903 that abuts against each other, and the conversion block 10 can swing around the first abutting portion 903. In this embodiment, the first slot 901 provides an installation environment for the conversion block 10. Since a tension spring is provided, one end of the spring generates a pulling force on the conversion block 10, causing the conversion block 10 to abut against the first slot 901 through the locking block 1001. The locking block 1001 is provided at one end of the conversion block 10 and can cooperate with the first slot 901. When the other end of the conversion block 10 is subjected to force, due to the limiting effect of the first slot 901 on the locking block 1001, the conversion block 10 can swing around the part where the locking block 1001 abuts against the first slot 901 (that is, the first abutting portion 903), and simultaneously drive one end of the tension spring to move downward.

[0047] In some embodiments, the common terminal 9 is provided with a second slot 902, and the switching piece 11 is provided with a connecting portion. The connecting portion and the second slot 902 have a second abutting portion 904 that abuts against each other, and the switching piece 11 can swing around the second abutting portion 904. In this embodiment, the second slot 902 provides an installation environment for the switching piece 11. One end of the tension spring generates a pulling force on the conversion block 10, and the other end also generates a pulling force on the switching piece 11, so that the connecting portion of the switching piece 11 is firmly fixed in the second slot 902, improving the stability of the switching piece 11. During the process of the conversion block 10 being pressed down, after being pressed down to a certain distance, the distance between the first connecting end 1301 and the second connecting end 1302 of the tension spring increases, and the elastic deformation of the tension spring increases. After reaching the maximum stroke of the contact portion 1002, the conversion block 10 drives the switching piece 11 to descend, and the switching contact 12 on the switching piece 11 contacts the second port contact 8 below, and the switch switches from the first working state to the second working state.

[0048] It is worth noting that the tension spring in this embodiment can be other elastic elements, which can not only connect the conversion block 10 and the switching piece 11, but also make the two firmly fixed on the common terminal 9.

[0049] In one exemplary embodiment, the single-pole double-throw micro switch further includes a housing assembly and a button 3, with the fixed contact assembly, the switching contact 12 and the switching mechanism all disposed within the housing assembly.

[0050] In this embodiment, the housing assembly can cover and protect the internal fixed contact assembly, switching contact 12, and switching mechanism.

[0051] In some embodiments, the housing assembly includes an outer shell 1, an inner shell 2, and a base 4. The base 4 is disposed at the bottom of the outer shell 1, and the inner shell 2 is disposed inside the outer shell 1 and abuts against the base 4.

[0052] In this embodiment, the outer shell 1, inner shell 2, and base 4 provide an installation environment for the aforementioned fixed contact assembly, switching contact 12, and switching mechanism.

[0053] For example, in this embodiment, the side wall of the base 4 is provided with a fixing part, which is inclined and flanged outward. During installation, it is installed from bottom to top. A bayonet is provided on the inner wall of the outer shell 1. The size of the bayonet corresponds to the fixing part. The bayonet can limit the fixing part. During the upward movement of the fixing part, it is slightly deformed by being limited by the inner wall of the outer shell 1 until it abuts against the top of the bayonet and can no longer move upward. In a specific embodiment, the base 4 can also be connected to the outer shell 1 by a thread to achieve a stable connection with the outer shell 1, or a detachable connection by bolts or screws can be used to achieve a quick connection between the outer shell 1 and the base 4.

[0054] It is worth noting that in this embodiment, after the base 4 is installed, the inner shell 2 is installed on the upper surface of the base 4, and the outer wall of the inner shell 2 is in contact with the inner wall of the outer shell 1.

[0055] In a specific embodiment, the single-pole double-throw micro switch also includes a button 3. The inner shell 2 has a clearance opening 201. The bottom of the button 3 has a trigger rod 301 that can pass through the clearance opening 201. The trigger rod 301 can be used to drive the switching block 10 to swing. By pressing down the button 3, the trigger rod 301 at the bottom of the button 3 presses down on the contact portion 1002, thereby driving the switching block 10 to press down and achieve the swinging of the switching block 10.

[0056] It is worth noting that in this embodiment, the inner shell 2 is also provided with multiple guide holes 202, and the bottom of the button 3 is provided with multiple guide rods 302. The guide rods 302 are inserted into the guide holes 202. In this embodiment, there are two guide holes 202 and two guide rods 302. The guide rods 302 can guide the movement of the button 3, ensuring that it can move stably. At the same time, the button 3 can be placed to rotate, avoiding the trigger rod 301 from being offset from the contact part 1002 and thus failing to trigger.

[0057] It should also be noted that in this embodiment, the side wall of the button 3 is provided with a first stepped surface, and the inner wall of the outer shell 1 is provided with a second stepped surface. The second stepped surface can be used to limit the height of the first stepped surface to prevent the button 3 from coming out of the outer shell 1.

[0058] In an exemplary embodiment, the inner shell 2 is provided with a reset rod 203, the button 3 is provided with a reset groove 303, and a reset spring 204 is sleeved on the reset rod 203 and passes through the reset groove 303.

[0059] In this embodiment, by means of the reset rod 203, when the button 3 is continuously pressed down, the reset spring 204 enters the reset groove 303 and squeezes the reset spring 204, and the reset spring 204 is compressed. When the button 3 is released, the reset spring 204 resets, and the button 3 resets synchronously.

[0060] In an exemplary embodiment, the single-pole double-throw micro switch further includes a first terminal 5 and a second terminal 6. A first port contact 7 is disposed on the first terminal 5, and a second port contact 8 is disposed on the second terminal 6. The base 4 is provided with a first slot 901, a second slot 902 and a third slot. The first terminal 5 is fixedly connected to the first slot 901, the second slot 902 is fixedly connected to the second terminal 6, and the common terminal 9 is fixedly connected to the third slot.

[0061] In this embodiment, the first terminal 5 and the second terminal 6 provide an installation environment for the first port contact 7 and the second port contact 8. The first terminal 5 and the second terminal 6 are both L-shaped, with the first terminal 5 being larger than the second terminal 6. The first port contact 7 is fixedly installed on the first terminal 5, and the second port contact 8 is installed on the second terminal 6. The working end of the first port contact 7 faces downward, and the working end of the second terminal 6 faces upward. Both sides of the switching contact 12 are working ends.

[0062] In some embodiments, the first terminal 5, the second terminal 6, and the common terminal 9 are all provided with stepped portions. The stepped portions allow the first terminal 5 to be interference-fitted with the first mounting groove, the second terminal 6 to be interference-fitted with the second mounting groove, and the common terminal 9 to be interference-fitted with the third mounting groove. The first terminal 5 protrudes from the first mounting groove and is exposed on the base 4, the second terminal 6 protrudes from the second mounting groove and is exposed on the base 4, and the common terminal 9 protrudes from the third mounting groove and is exposed on the base 4. The arrangement of each terminal protruding from the base 4 makes it easy to disassemble each terminal.

[0063] Specific implementation steps:

[0064] During use, the first port contact 7 is designated as a normally open contact. When the switching contact 12 contacts the normally open contact, the switch is in a normally open state. When the switch needs to be closed, the button 3 is pressed down. At this time, the return spring 204 is compressed, and the trigger rod 301 at the bottom of the button 3 moves downward synchronously in the clearance groove until it contacts the contact part 1002. The contact part 1002 is pressed down continuously, and the switching block 10 swings up and down around the first abutment part 903. During the continuous descent of the contact part 1002 of the switching block 10, the elastic element 13 will eventually undergo elastic deformation and be in a large stretching state. This pulls the switching plate 11 to swing up and down around the second abutment part 904 until the switching contact 12 on the switching plate 11 contacts the second port contact 8, and the switch is closed. When the button 3 is released, the return spring 204 resets, pushes the button 3 up, and the button 3 resets, and the switch returns to the normally open state. Therefore, when the switch needs to be turned off, the elastic element 13 needs to achieve a certain elastic deformation in order to pull the switching contact 12 at the end of the switching piece 11 downward, thereby avoiding the switch being accidentally turned off under frequent vibration and improving the shock resistance of the switch.

[0065] In summary, when this utility model is applied in special fields, such as nuclear power environments or working environments with frequent vibrations, the elastic element 13 needs to achieve a certain elastic deformation in order to achieve the function of pulling the switching contact 12 at the end of the switching piece 11 down to contact the second port contact 8. This avoids the switch being accidentally turned off under frequent vibrations, reduces the possibility of accidental microswitch activation, and improves the overall shock resistance of the microswitch.

[0066] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. A single-pole double-throw micro switch, characterized in that, include: A fixed contact assembly, the fixed contact assembly including a first port contact and a second port contact; A switching contact is disposed between a first port contact and a second port contact. The switching contact has a first working state in contact with the first port contact and a second working state in contact with the second port contact. A switching mechanism includes a switching block and a switching plate. The switching block is elastically connected to the switching plate. The switching contact is disposed on the switching plate. The switching block can be used to drive the switching contact to swing and to drive the switching contact to switch between a first working state and a second working state.

2. The single-pole double-throw micro switch according to claim 1, characterized in that: The switching mechanism also includes a common terminal. The switching block and the switching piece are both fixed on the common terminal. An elastic element is provided between the switching block and the common terminal. The switching block and the switching piece respectively abut against the common terminal through the elastic element.

3. The single-pole double-throw micro switch according to claim 2, characterized in that: The common terminal is provided with a first slot, and the conversion block is provided with a card block. The card block and the first slot have a first abutting part that abuts against each other, and the conversion block can swing around the first abutting part.

4. The single-pole double-throw micro switch according to claim 2, characterized in that: The common terminal is provided with a second slot, and the switching plate is provided with a connecting part. The connecting part and the second slot have a second abutting part that abuts against each other, and the switching plate can swing around the second abutting part.

5. The single-pole double-throw micro switch according to claim 2, characterized in that: The single-pole double-throw micro switch also includes a housing assembly and a button, and the fixed contact assembly, switching contact and switching mechanism are all disposed within the housing assembly.

6. The single-pole double-throw micro switch according to claim 5, characterized in that: The housing assembly includes an outer shell, an inner shell, and a base. The base is disposed at the bottom of the outer shell, and the inner shell is disposed inside the outer shell and abuts against the base.

7. The single-pole double-throw micro switch according to claim 6, characterized in that: The single-pole double-throw micro switch also includes a button. The inner shell is provided with a clearance opening. The bottom of the button is provided with a trigger rod that can pass through the clearance opening. The trigger rod can be used to drive the switching block to swing.

8. The single-pole double-throw micro switch according to claim 7, characterized in that: The inner shell is provided with a reset rod, the button is provided with a reset groove, and a reset spring is sleeved on the reset rod and passes through the reset groove.

9. The single-pole double-throw micro switch according to claim 8, characterized in that: The inner shell is provided with multiple guide holes, and the bottom of the button is provided with a guide rod corresponding to the guide hole, and the guide rod is inserted into the guide hole.

10. The single-pole double-throw micro switch according to claim 6, characterized in that: The single-pole double-throw micro switch also includes a first terminal and a second terminal. The first port contact is disposed on the first terminal, and the second port contact is disposed on the second terminal. The base is provided with a first slot, a second slot and a third slot. The first terminal is fixedly connected to the first slot, the second slot is fixedly connected to the second terminal, and the common terminal is fixedly connected to the third slot.

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