Pneumatic control microswitch
By designing pneumatic control microswitches, the linkage mechanism between pneumatic control components and touch buttons is used to achieve accurate response to pneumatic/water pressure, solving the problems of signal output hysteresis and false triggering in the prior art, improving control accuracy and reliability, and suitable for a variety of industrial scenarios.
Patent Information
- Application Number
- CN202520930629.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-05-13
- Publication Date
- 2025-06-24
- Estimated Expiration
- 2035-05-13
AI Technical Summary
The existing micro switches cannot effectively utilize the characteristics of pressure parameter changes in air pressure/water pressure control scenarios, resulting in hysteresis or false triggering of signal output. The lack of pressure adaptive adjustment modules makes it difficult to achieve precise control and cannot form coordinated control with the pressure sensing system, resulting in an increase in the misjudgment rate of the protection system.
A pneumatically controlled micro switch is designed, and the linkage mechanism between the pneumatic control component and the touch button is adopted. Through the pressure response principle, when the external air pressure/water pressure reaches the set threshold, the gas source driving component accurately triggers the switch action to achieve a linear correspondence between pressure-electric signals.
It improves the response speed, eliminates physical contact wear problems, is suitable for humid, dust and weakly corrosive media environments, and is especially suitable for industrial scenarios such as sewage treatment and hydraulic equipment, and realizes precise control of different pressure thresholds, reducing the risk of signal jitter and false triggering.
Smart Images
Figure CN223023145U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a micro switch, in particular to a pneumatic control micro switch. Background Art
[0002] As a common electrical control component, the micro switch has an important application in the field of safety detection of the washing machine door body. It is usually installed on the edge of the washing machine door frame. When the door body is closed, the mechanical pressure applied triggers the deformation of the internal reed, causing the contacts to conduct or disconnect, thereby transmitting the open / closed state signal of the door body to the control system. When the user closes the washing machine door, the door lock mechanism drives the movable pressure rod to contact the execution component of the micro switch, and at this time, the circuit is connected to allow the washing program to start; if the door body is not fully closed, the micro switch remains in the open state to block the operation of the device, effectively preventing safety accidents caused by accidental door opening during the washing process. Such a mechanical trigger structure is widely used in pulsator washing machines and drum washing machines. Its working principle is simple and the manufacturing cost is low, and it has become a basic component to ensure the safe use of washing machines.
[0003] However, the existing technical solutions have significant technical drawbacks in the air pressure / water pressure control scenarios. First of all, the traditional mechanical trigger mechanism cannot effectively utilize the characteristics of pressure parameter changes. When the water level rises and falls, resulting in dynamic pressure fluctuations, the mechanical contacts cannot establish a linear correspondence between pressure and electrical signals, leading to signal output hysteresis or mis-triggering. Secondly, the existing structure lacks a pressure adaptive adjustment module and is difficult to perform precise control according to different pressure thresholds generated by water level changes, and signal jitter is likely to occur at the critical point during the slow pressure change process. More importantly, the traditional micro switch cannot form a cooperative control with the pressure sensing system. When there is an abnormal pressure in the sealed cabin (such as air pressure change caused by water leakage through the door seam), it cannot achieve a sealed failure warning through pressure gradient analysis. Relying solely on a single mechanical trigger is difficult to distinguish normal water level pressure from abnormal leakage pressure, resulting in an increase in the misjudgment rate of the protection system. Summary of the Utility Model
[0004] In view of the deficiencies of the prior art, the utility model provides a pneumatic control micro switch that realizes control through pneumatic means.
[0005] To achieve the above object, the technical solution of the utility model is as follows: A pneumatic control micro switch includes an outer housing. An electrical device is arranged inside the outer housing. One end of the outer housing is provided with pins for plugging. The other end of the outer housing is provided with a touch button. It further includes a pneumatic control component arranged on one side of the touch button on the outer housing. The end of the pneumatic control component away from the touch button is provided with an air inlet connected to a gas source. When the gas source enters the air inlet, the pneumatic control component presses the touch button, and when the gas source does not enter the air inlet, the touch button is reset.
[0006] The beneficial effects of the present utility model are as follows: The linkage mechanism between its pneumatic control component and the touch button adopts the pressure response principle. When the external air pressure / water pressure reaches the set threshold value, the air source driving component accurately triggers the switch action, improving the response speed. Compared with the traditional mechanical switch, this design eliminates the problem of physical contact wear and can still maintain the stability of contact resistance in the long-term high-frequency operation scenario. It can withstand humid, dusty, and weakly corrosive medium environments and is particularly suitable for industrial scenarios such as sewage treatment and hydraulic equipment. The pressure-adjustable characteristic of the pneumatic control component enables the pressing force of the touch button to be flexibly adjusted according to the working conditions, avoiding damage to the internal components of the switch due to excessive pressure. As a preferred method, the pneumatic control component can adopt a piston structure, and a pressure regulating valve is set at the air inlet. When the air source pressure reaches the set threshold value, it pushes the piston rod to execute the touch button action. This structure can achieve linear adjustment of the action stroke through precise control of the air pressure value. At the same time, the cooperation between the piston rod and the guide sleeve can effectively prevent gas leakage.
[0007] Furthermore, the pneumatic control component includes an installation housing for forming an internal seal. A guide post with one end in contact with the touch button is arranged inside the installation housing, and a return spring for resetting the guide post is sleeved outside the guide post.
[0008] This technical solution realizes the mechanical reset function of pneumatic control through the cooperation of the guide post and the return spring. The linear movement track of the guide post ensures the accuracy of the touch button action, and the pre-tightening force setting of the return spring can match the reset requirements under different air pressure conditions. The sealing design of the installation housing effectively isolates external pollutants from entering and extends the service life of the switch. As a preferred method, the guide post can adopt a stepped shaft structure. Its large-diameter section forms a sliding seal fit with the installation housing, and a spring positioning step is set on the small-diameter section. The return spring is selected as a variable pitch spring, which can provide an increasing return force during the compression process. This structure not only ensures the sealing reliability but also can adapt to the elastic requirements under different strokes.
[0009] Furthermore, the installation housing includes a lower housing arranged on the outer housing, a middle housing fixedly connected to the lower housing by clamping, and an upper housing fixedly connected to the middle housing by clamping. The lower housing, the middle housing, and the upper housing have the same central axis, and the air inlet is arranged on the upper housing.
[0010] The layered housing structure realizes modular assembly, simplifies the installation process through the axial clamping and fixing method. The coaxial design ensures the linearity of the air flow channel and reduces air pressure loss. The three-housing combination structure is convenient for the layered installation and maintenance of each functional component. As a preferred method, a rotary snap connection is adopted between the lower housing and the middle housing, and an elastic claw structure is arranged between the middle housing and the upper housing. During assembly, locking can be completed by axially pressing and rotating a specific angle. This connection method realizes quick disassembly and assembly while ensuring airtightness and is particularly suitable for working conditions that require regular maintenance.
[0011] Furthermore, a abutting ring, a tensioning ring and a clamping ring are respectively arranged on the lower shell from its center towards the radial outer edge. The abutting ring is used to place the guide post and form a clearance fit with the guide post. A spring groove for placing a return spring is formed between the abutting ring and the tensioning ring. A plugging groove for placing the middle shell is formed between the clamping ring and the tensioning ring. A plurality of clamping rings are circumferentially arranged along the edge of the lower shell and are in an inverted U shape, and a positioning gap is arranged between adjacent clamping rings.
[0012] This structure realizes functional zoning through a multi-stage annular structure. The clearance fit of the abutting ring provides precise guidance for the guide post, and the defined space of the spring groove ensures the stable operation of the return spring. The cooperation of the inverted U-shaped clamping ring and the positioning gap realizes precise positioning and reliable clamping. As a preferred method, a wedge-shaped guiding surface is arranged on the inner wall of the clamping ring. When the plugging ring of the middle shell contacts the guiding surface during the assembly process, it will generate radial elastic deformation and restore its shape to achieve locking when reaching the clamping position. This design realizes tool-free assembly through the elastic deformation of the structure, and at the same time, the equidistant arrangement of the positioning gaps ensures the circumferential positioning accuracy.
[0013] Furthermore, a plurality of limiting ribs are arranged along the circumferential gap on the side wall of the spring groove, and the plurality of limiting ribs abut against the outer peripheral surface of the return spring to prevent the return spring from shifting in position.
[0014] The arrangement of the limiting ribs effectively restricts the radial movement of the return spring and prevents the action jamming caused by the spring yaw. The circumferential gap setting not only ensures the limiting effect but also avoids excessive restraint on the spring deformation. As a preferred method, the limiting ribs are designed with an arc-shaped cross-section, and the radius of curvature thereof matches the outer diameter of the spring. The depth of the guiding groove formed between adjacent limiting ribs is 1 / 3 - 1 / 2 of the spring wire diameter. This structure allows appropriate elastic deformation while restricting the spring offset, can maintain the spring centering and avoid stress concentration caused by excessive restraint.
[0015] Furthermore, a silica gel soft sleeve is arranged at one end of the guide post. The silica gel soft sleeve is sleeved on the tensioning ring and forms a sealing fit with the tensioning ring. One end of the return spring abuts against the silica gel soft sleeve.
[0016] The silica gel soft sleeve realizes the dual functions of dynamic sealing and buffering, which not only ensures airtightness but also reduces contact noise. As a preferred method, the silica gel soft sleeve adopts a double-layer structure. The inner layer is a dense layer for sealing, and the outer layer is a porous elastic layer for buffering. The socket part is provided with an annular protrusion and forms an interference fit with the groove of the tensioning ring. This structure can still maintain good airtightness after multiple reciprocating movements, and at the same time, the elastic layer can absorb impact energy and extend the service life of the guide post.
[0017] Furthermore, one end of the middle housing facing the upper housing is provided with a socket ring. A plurality of socket grooves are circumferentially and spacedly arranged on the inner wall of the socket ring. One end of the upper housing facing the middle housing is provided with a fixing ring, and the other end is an air inlet which protrudes from the surface of the upper housing. A plurality of expansion fasteners matching with the socket grooves are arranged on the outer peripheral wall of the fixing ring in the circumferential direction. When the expansion fasteners abut against the ends of the socket grooves, a clamping and fixing is formed between the middle housing and the upper housing.
[0018] This clamping structure realizes reliable connection through rotational locking. The cooperation between the socket grooves and the expansion fasteners ensures the assembly stability. As a preferred method, the socket grooves adopt a spiral gradually deepening structure, and a spherical protrusion is arranged at the end of the expansion fastener. During assembly, the spherical protrusion is rotated to move along the spiral groove until it is stuck into the positioning pit. This design realizes anti-loosening through the mechanical self-locking principle. When the rotation angle is between 30° and 45°, a fully locked state can be achieved, which not only ensures the connection strength but also is convenient for operation.
[0019] Furthermore, an access slot for the expansion fasteners to enter and with a circumferential width larger than that of the expansion fasteners is also arranged at the opening on the side of the socket ring facing the upper housing. Below the access slot, there is a abutting platform on the same horizontal plane as the bottom of the socket groove. During the process of the expansion fastener sliding to the end of the socket groove, a tightening fit is gradually formed between the expansion fastener and the socket groove.
[0020] The design of the access slot realizes rapid positioning and assembly, and the abutting platform provides an axial limiting reference. As a preferred method, a flared guiding structure is arranged at the entrance of the access slot, and a rubber damping layer is arranged at the bottom of the socket groove. When the expansion fastener slides in, a progressive resistance will be generated, and an interference fit is realized through the elastic deformation of the rubber layer when it rotates to the end. This structure not only ensures the assembly feel but also can confirm the assembly in place through tactile feedback. Description of the Drawings
[0021] Figure 1 Isometric view of the embodiment of the present utility model;
[0022] Figure 2 Exploded view of the embodiment of the present utility model;
[0023] Figure 3 Exploded view of the installation housing of the embodiment of the present utility model;
[0024] Figure 4 Cross-sectional view of the embodiment of the present utility model. Detailed Embodiment
[0025] A pneumatic control microswitch as Figures 1-4As shown in the figure: it includes a housing 1, and an electrical device 11 is installed inside the housing 1. One end of the housing 1 is provided with pins 12 for plugging, and the other end is installed with a touch button 13. The housing 1 is provided with a pneumatic control component 14 on the side of the touch button 13, and an air inlet 15 connected to the air source is provided at the end of the component away from the touch button 13. The pneumatic control component 14 includes an installation housing composed of a lower housing 141, a middle housing 142 and an upper housing 143 through snap connection. The three have a common central axis, and the air inlet 15 is arranged at the top of the upper housing 143.
[0026] A guide post 17 is arranged inside the installation housing, and one end of the guide post 17 is in contact with the touch button 13. A return spring 18 is sleeved outside the guide post 17, and a silica gel soft sleeve 19 is installed at the end of the guide post 17. A abutting ring 1411, a tightening ring 1412 and a snap ring 1413 are successively arranged at the center of the lower housing 141. Among them, the abutting ring 1411 forms a clearance fit with the guide post 17, and the tightening ring 1412 forms a sealing fit with the silica gel soft sleeve 19. A spring groove 1414 for accommodating the return spring 18 is formed between the abutting ring 1411 and the tightening ring 1412, and circumferentially distributed limiting ribs 1415 are arranged on the side wall of the spring groove 1414 for fixing the position of the spring. A plugging groove 1416 is formed between the snap ring 1413 and the tightening ring 1412. The snap ring 1413 adopts an inverted U-shaped structure and is provided with a circumferential positioning gap 1417.
[0027] A plugging ring 1421 is arranged at the bottom of the middle housing 142, and a snap buckle 1422 matched with the snap ring 1413 and a positioning rib 1423 matched with the positioning gap 1417 are arranged on its outer peripheral wall. A socketing ring 1424 is arranged at the top of the middle housing 142. A socketing groove 1425 and an inlet and outlet groove 1426 are opened on the inner wall of the socketing ring 1424, and an abutting platform 1427 is arranged below the inlet and outlet groove 1426. A fixing ring 1431 is arranged at the bottom of the upper housing 143, a tightening buckle 1432 matched with the socketing groove 1425 is arranged on its outer peripheral wall, and a raised air inlet 15 is arranged at the top.
[0028] When the air source enters the air inlet 15, the air pressure pushes the guide post 17 through the silica gel soft sleeve 19 to compress the return spring 18 and press the touch button 13; when the air source is disconnected, the return spring 18 pushes the guide post 17 to reset. Each component of the installation housing is quickly assembled through a snap connection structure: the lower housing 141 and the middle housing 142 are matched through the snap buckle 1422 and the snap ring 1413, and the middle housing 142 and the upper housing 143 form a tight connection through the tightening buckle 1432 and the socketing groove 1425. The silica gel soft sleeve 19 maintains airtightness during the action process, and the limiting ribs 1415 ensure that the return spring 18 does not shift.
[0029] The above embodiments are only one of the preferred specific embodiments of the present invention, and the common changes and substitutions made by those skilled in the art within the scope of the technical solution of the present invention are all included in the protection scope of the present invention.
Claims
1. A pneumatically controlled micro switch, comprising an outer shell, an electrical device is arranged in the outer shell, a pin for plugging is arranged at one end of the outer shell, and a touch button is arranged at the other end of the outer shell, characterized in that: It also includes a pneumatic control component arranged on one side of the touch button on the outer shell, and an air inlet connected to the air source is arranged at the end of the pneumatic control component away from the touch button. The pneumatic control component presses the touch button when the air source enters the air inlet, and resets the touch button when the air source does not enter the air inlet.
2. The pneumatically controlled micro switch according to claim 1, characterized in that: The pneumatic control assembly comprises a mounting shell for forming an internal seal, a guide column with one end in contact with the touch button is arranged in the mounting shell, and a reset spring for resetting the guide column is arranged outside the guide column.
3. The pneumatically controlled micro switch according to claim 2, characterized in that: The mounting shell includes a lower shell arranged on the outer shell, a middle shell fixed to the lower shell by snap-fitting, and an upper shell fixed to the middle shell by snap-fitting. The lower shell, the middle shell and the upper shell have the same central axis, and the air inlet is arranged on the upper shell.
4. The pneumatically controlled micro switch according to claim 3, characterized in that: The lower shell is respectively provided with an abutment ring, an expansion ring and a clamping ring from the center toward the radial outer edge thereof, the abutment ring is used to place a guide column and a gap is formed with the guide column, a spring groove for placing a reset spring is formed between the abutment ring and the expansion ring, a plug-in groove for placing the middle shell is formed between the clamping ring and the expansion ring, a plurality of clamping rings are circumferentially arranged along the edge of the lower shell and are in an inverted shape, and a positioning gap is arranged between adjacent clamping rings; a plug-in ring is provided in the corresponding plug-in groove of the middle shell, the outer peripheral wall of the plug-in ring is provided with a plurality of clamping buckles that cooperate with the clamping ring for clamping between the middle shell and the lower shell, and a plurality of positioning ribs that cooperate with the positioning gap to facilitate installation between the middle shell and the lower shell are also provided on the outer peripheral wall of the plug-in ring.
5. The pneumatically controlled micro switch according to claim 4, characterized in that: The side wall of the spring slot is provided with a plurality of limiting ribs along the circumferential gap, and the plurality of limiting ribs abut against the outer circumferential surface of the return spring to prevent the return spring from positional deviation.
6. The pneumatically controlled micro switch according to claim 4, characterized in that: A silicone soft sleeve is arranged at one end of the guide column, and the silicone soft sleeve is arranged on the expansion ring to form a sealing fit between the expansion rings, and one end of the reset spring abuts against the silicone soft sleeve.
7. The pneumatically controlled micro switch according to claim 3, characterized in that: A sleeve ring is provided at one end of the middle shell body facing the upper shell body, and a plurality of sleeve grooves are provided on the inner wall of the sleeve ring at intervals along the circumferential direction. A fixing ring is provided at one end of the upper shell body facing the middle shell body, and the other end is an air inlet, which is protruding from the surface of the upper shell body. A plurality of expansion buckles matching with the sleeve grooves are provided on the outer peripheral wall of the fixing ring along the circumferential direction, and a clamping fixation is formed between the middle shell body and the upper shell body when the expansion buckle abuts against the end of the sleeve groove.
8. The pneumatically controlled micro switch according to claim 7, characterized in that: An entry and exit groove for the expansion buckle to enter and with a circumferential width greater than the expansion buckle is also provided at the opening on the sleeve ring facing the upper shell side. A supporting platform is provided below the entry and exit groove and is in the same horizontal plane as the bottom of the sleeve groove. The expansion buckle gradually forms an expansion fit with the sleeve groove during the process of sliding to the end of the sleeve groove.