Pressure switch with high electrical connection stability

Abstract

The utility model discloses an electric connection high-stability pressure switch, which comprises a shell, a movable cavity is arranged in the shell, a switch assembly is arranged in the movable cavity, the switch assembly comprises static contact pieces and a movable contact piece, the two static contact pieces are provided with inclined static contact pieces, the two static contact pieces are oppositely folded and inclined, the static contact pieces are electrically connected with power connection pieces penetrating through the shell, and the power connection pieces are electrically connected with the movable cavity. The moving contact piece comprises a moving contact frame and a moving contact which are connected, the moving contact is located between the two power connection faces, the side face, located between the two power connection faces, of the moving contact is a touch face, the touch face is a circular truncated cone face, and the touch face is located between the two power connection faces. A pushing piece is arranged on one side of the movable contact frame, a reset assembly is arranged on the other side of the touch frame, the pushing piece moves towards or away from the movable contact frame, the reset assembly abuts against and pushes the movable contact frame, the touch surface and the power connection surface are pushed by the pushing piece to achieve reliable contact or separation, the contact area between the movable contact and the static contact piece is increased, and poor contact is avoided.

Description

Technical Field

[0001] This application relates to the technical field of pressure switches, and in particular to a pressure switch with high electrical connection stability. Background Technology

[0002] Pressure switches, as key components in industrial automation control, are widely used in hydraulic, pneumatic systems, and various mechanical equipment. In the automotive field, especially in transmission systems, the role of pressure switches is particularly crucial. In automotive transmission oil circuits, changes in oil pressure are critical to the transmission's operating status. Excessively high or low oil pressure can affect the efficiency and lifespan of the internal gear transmission. Pressure switches can monitor oil pressure changes in real time, promptly converting pressure signals into electrical signals, thereby ensuring the transmission is always in optimal operating condition. This monitoring and protection of the equipment's operational status is essential.

[0003] In existing technologies, to achieve the conversion of pressure signals to electrical signals, electrical connection is usually achieved by the moving contact and the stationary contact abutting each other. Specifically, common methods include pressing the moving contact and the stationary contact together with a spring to ensure contact reliability, or increasing the contact area by designing a contact structure with a specific shape. These methods are widely used in practical applications to improve the performance and stability of pressure switches.

[0004] However, these methods in the existing technology still have obvious defects. Because multiple protruding contact points are formed on the surface of the moving contact and the stationary contact during the manufacturing process, the actual contact form when the moving contact and the stationary contact come into contact with each other gradually changes to point contact, thereby gradually reducing the contact area. Especially during the operation of automotive transmissions, vibration or shock environments are common, which can easily lead to poor contact problems, thereby affecting the stable conversion of pressure signals to electrical signals. This makes it difficult to meet the requirements of high reliability application scenarios, especially under high-speed operation or extreme temperature conditions, the problem is more prominent. Summary of the Invention

[0005] To improve the stability of the connection between the moving contact and the stationary contact, a pressure switch with high electrical connection stability is provided.

[0006] The above-mentioned objective of this application is achieved through the following technical solution:

[0007] A pressure switch with high electrical connection stability includes a housing with a movable cavity inside. A switch assembly is installed in the movable cavity. The switch assembly includes a stationary contact and a moving contact. There are two stationary contacts, and the two stationary contacts are provided with inclined stationary contact plates on the same side. The two stationary contact plates are inclined towards each other and are electrically connected to a contactor penetrating outside the housing. The inclined surfaces of the two stationary contact plates are contact surfaces. The moving contact includes a connected moving contact frame and a moving contact head. The moving contact head is located between the two contact surfaces. The side of the moving contact head located between the two contact surfaces is the contact surface. The contact surface is a frustum-shaped surface and is located between the two contact surfaces.

[0008] The movable contact frame is provided with a pusher on one side along the axial direction of the movable contact surface, and a reset assembly is provided on the other side along the axial direction of the contact surface. The pusher is slidably connected inside the housing, and the sliding direction is towards or away from the switch assembly. The end of the pusher facing away from the switch assembly extends through and out of the housing. The reset assembly faces the pusher and pushes against the movable contact frame.

[0009] By adopting the above technical solution, in the automotive transmission oil circuit system, when the pressure in the oil circuit increases, the pressure in the oil circuit will push the pusher to move towards the reset assembly. The pusher will simultaneously push the moving contact to press against the reset assembly. The two stationary contacts will tilt towards each other, and the inclined surfaces of the two stationary contacts will be the contact surfaces. The contact surface of the moving contact is a frustum. The frustum contact surface of the moving contact and the contact surface of the stationary contacts will reliably contact or separate under the push of the pusher. This combination of frustum and inclined contact surface can significantly increase the actual contact area between the moving contact and the stationary contacts, effectively avoiding the contact problems caused by traditional point contact. Even under vibration or shock environments, this design can still maintain a stable electrical connection state, thereby ensuring the reliability of pressure signal to electrical signal conversion and meeting the needs of high-stability application scenarios.

[0010] Preferably, the number of moving contacts is such that two opposing inclined stationary contact pieces are installed on each side of the two contact pieces.

[0011] By adopting the above technical solution, compared with setting the opposing inclined stationary contact piece on only one side, setting the opposing inclined stationary contact pieces on both sides of the contact piece expands the contact between the moving contact and the stationary contact piece from a single position to multiple positions, increasing the contact area between the moving contact and the stationary contact piece, making the electrical connection more reliable, and avoiding contact problems caused by vibration or impact. This significantly improves the stability and reliability of the pressure switch under complex working conditions, thereby ensuring the accuracy and continuity of the conversion of pressure signal to electrical signal.

[0012] Preferably, the moving contact frame includes a trigger arm and a connecting arm. The trigger arm protrudes towards the pusher, and two connecting arms are fixed on the side of the trigger arm facing the moving contact frame. The two moving contacts are respectively fixed on the two connecting arms.

[0013] By adopting the above technical solution, the moving contact frame can receive the thrust of the pusher more stably and transmit it to the moving contact. At the same time, the trigger arm can stably drive the two connecting arms to move synchronously, so that the moving contacts on the two connecting arms maintain a consistent action state, effectively ensuring the synchronicity of the movement of the two moving contacts and improving the reliability and stability of the pressure switch in the process of electrical signal conversion.

[0014] Preferably, the reset assembly includes a reset spring, one end of which abuts against the inner wall of the housing, and the other end of which abuts against the moving contact frame and pushes it toward the pushing member.

[0015] By adopting the above technical solution, the reset spring can provide a stable and reliable reset force for the moving contact, ensuring that the moving contact quickly returns to the initial position after completing the trigger electrical signal. The direction of the reset force is towards the pusher side, which effectively ensures the contact stability and accuracy between the moving contact and the stationary contact, thereby improving the reliability and response speed of the conversion of pressure signal to electrical signal.

[0016] Preferably, the reset assembly further includes a limiting protrusion located within the reset spring, and the limiting protrusion is fixedly connected to the inner wall of the housing.

[0017] By adopting the above technical solution, the limiting protrusion in the reset assembly can effectively limit the deformation range of the reset spring, prevent the reset spring from failing due to excessive deformation during compression or stretching, and ensure that the process of converting pressure signal into electrical signal is more stable and reliable.

[0018] Preferably, the inner wall of the movable cavity has a first annular groove on the side of the movable contact frame facing the pusher, and a sealing gasket is covered in the first annular groove. The inner wall of the movable cavity has a second annular groove on the side of the first annular groove facing away from the pusher, and a limiting ring is covered in the second annular groove. The limiting ring is made of a rigid material and abuts against the sealing gasket on the side of the limiting ring facing the pusher. The inner wall of the movable cavity has a third annular groove on the side of the second annular groove facing away from the pusher. When the third annular groove is cold extruded, the surface of the third annular groove facing the limiting ring is covered to form a limiting retaining ring, and the limiting retaining ring abuts against the side of the limiting ring facing away from the sealing gasket.

[0019] By adopting the above technical solution, the sealing gasket can reliably separate the switching chamber and the pushing chamber, effectively preventing oil in the oil circuit system from leaking from the pushing chamber into the switching chamber, thereby significantly improving the sealing performance of the pressure switch. At the same time, the metal limiting ring has a low thermal expansion and contraction rate, which can stably compress the sealing gasket in the environment of alternating high and low temperatures, avoiding the sealing gasket from losing its sealing effect due to material shrinkage and deformation, and further preventing the sealing gasket from shifting due to insufficient compression force. The third ring groove covers the surface of the limiting ring during cold extrusion molding to form a limiting retaining ring, so that the limiting ring is limited and fixed between the second ring groove and the third ring groove, preventing it from loosening or falling off due to vibration or impact during use, further improving the overall structural stability of the switch assembly, and ensuring the reliable operation of the pressure switch under various working conditions.

[0020] Preferably, the inner circumferential sidewall of the limiting ring facing the sealing gasket has a first annular protrusion, and the first annular protrusion abuts against the side of the sealing gasket facing away from the pushing member. The sealing gasket includes a sealing end, and a limiting end facing the first annular protrusion is fixed on the circumferential sidewall of the sealing end.

[0021] By adopting the above technical solution, when the pressure switch is working in a high-temperature environment, the sealing gasket may deform or change position due to thermal expansion and contraction. The first annular protrusion and the limiting end cooperate with each other to significantly enhance the axial positioning stability of the sealing gasket, effectively prevent the sealing gasket from shifting axially during the movement of the moving contact frame, and thus improve the overall sealing performance and working reliability of the pressure switch.

[0022] Preferably, the switch cavity is provided with a fixing ring located on the side of the limiting ring facing away from the sealing gasket. The fixing ring is located on the outer periphery of the moving contact frame. The side of the fixing ring facing the sealing gasket is fixed with a ring edge. The inner peripheral sidewall of the limiting ring facing the fixing ring is provided with a second ring protrusion, and the second ring protrusion is distributed facing the ring edge.

[0023] By adopting the above technical solution, the addition of a fixed ring can provide stable guidance and limiting for the movement of the moving contact frame, ensuring that the trigger arm remains stable during operation and effectively preventing it from deviating or swaying. At the same time, the second ring protrusion cooperates with the ring edge on the fixed ring to effectively limit the position of the fixed ring, preventing the fixed ring from shifting due to vibration or impact during long-term use. This ensures precise cooperation between the fixed ring and the moving contact frame, improves the stability of the overall structure, enhances the reliability of the pressure switch under complex working conditions, and ensures that the process of converting the pressure signal into an electrical signal is more accurate and stable.

[0024] In summary, this application includes at least one of the following beneficial technical effects:

[0025] 1. By designing the two stationary contact pieces as inclined structures facing each other and making the contact surface of the moving contact a frustum, the effective contact area between the moving contact and the stationary contact pieces is increased, avoiding poor contact caused by point contact, thereby improving the stability of pressure signal to electrical signal conversion;

[0026] 2. The moving contact frame, through the coordinated action of the reset component and the pusher, ensures that the moving contact can maintain a reliable contact state under vibration or shock environment, thereby enhancing the reliability of the pressure switch under complex operating conditions. Attached Figure Description

[0027] Figure 1 A schematic diagram of a pressure switch structure with high electrical connection stability;

[0028] Figure 2 This is an exploded view of the area between the plug and the socket.

[0029] Figure 3 for Figure 1 A sectional view;

[0030] Figure 4 This is an exploded view of the moving and stationary contacts.

[0031] Figure 5 This is an exploded view of a pressure switch in cross-section.

[0032] Figure 6 This is a cross-sectional view of the third annular groove after cold extrusion.

[0033] Reference numerals: 1. Housing; 11. Plug; 12. Lower base; 13. Movable cavity; 14. First annular groove; 15. Switch cavity; 16. Push cavity; 17. Second annular groove; 18. Third annular groove; 181. Limiting retaining ring; 2. Switch assembly; 21. Stationary contact; 211. Stationary contact piece; 212. Electrical contact surface; 22. Moving contact; 221. Moving contact frame; 2211. Trigger arm; 2212. Connecting arm; 222. Moving contact; 2221. Contact surface; 23. Electrical contact; 3. Pushing component; 4. Reset assembly; 41. Reset spring; 42. Limiting protrusion; 5. Sealing gasket; 51. Sealing end; 52. Limiting end; 6. Limiting ring; 61. First annular protrusion; 62. Second annular protrusion; 7. Fixing ring; 71. Ring edge; Detailed Implementation

[0034] The following section provides a more detailed description, in conjunction with the accompanying diagrams:

[0035] As attached Figure 1 and attached Figure 2As shown, a pressure switch with high electrical connection stability includes a housing 1. The housing 1 includes a plug 11 and a lower seat 12 that are joined together. The plug 11 is made of plastic, and the lower seat 12 is made of metal. The plug 11 and the lower seat 12 are joined together to form a movable cavity 13 within the lower seat 12. The plug 11 is inserted into the movable cavity 13 and connected to the inner wall of the movable cavity 13.

[0036] As attached Figure 3 and attached Figure 4 As shown, a switch assembly 2 is installed inside the active cavity 13. The switch assembly 2 includes a stationary contact 21 and a moving contact 22. There are two stationary contacts 21, and two cylindrical electrical connectors 23 are connected to each of the two stationary contacts 21. The other end of the two electrical connectors 23 extends through the plug 11. The end of the electrical connector 23 outside the plug 11 is electrically connected to the gearbox circuit for outputting an electrical signal. The two stationary contacts 21 are distributed facing each other. On the same side of the two stationary contacts 21, there are two opposing inclined stationary contact pieces 211. The two opposing inclined stationary contact pieces 211 are arranged in a group. There are two groups on each side of the two opposing stationary contacts 21. The opposing inclined surfaces of the two stationary contact pieces 211 in the same group are the electrical contact surfaces 212.

[0037] The moving contact 22 is located between two stationary contacts 21. The moving contact 22 includes a moving contact frame 221 and a moving contact head 222. The moving contact frame 221 includes a trigger arm 2211 protruding from the plug 11. The trigger arm 2211 is U-shaped. Two relatively parallel connecting arms 2212 are provided on the side of the trigger arm 2211 facing the plug 11. The two connecting arms 2212 are fixedly connected to the trigger arm 2211 respectively.

[0038] There are two moving contacts 222, each shaped like a frustum and made of composite silver. The two moving contacts 222 are respectively installed on the side of the two connecting arms 2212 facing away from the plug 11. One moving contact 222 is located between two opposing inclined contact surfaces 212 in one group, and the other moving contact 222 is located between two opposing inclined contact surfaces 212 in another group. The side of the moving contact 222 located on the two contact surfaces 212 is the contact surface 2221, which is a frustum and located between the two contact surfaces 212. The combination of the frustum and the inclined contact surface 212 can significantly increase the actual contact area between the moving contact 222 and the stationary contact piece 211, effectively avoiding the contact problems caused by traditional point contact. Even under vibration or shock environment, this design can still maintain a stable electrical connection state.

[0039] A pusher 3 is provided on one side of the movable contact frame 221 along the axial direction of the contact surface 2221, and a reset assembly 4 is provided on the other side of the movable contact frame 221 along the axial direction of the contact surface 2221. The pusher 3 is slidably connected to the lower seat 12. One end of the pusher 3 faces the movable contact frame 221, and the other end of the pusher 3 extends through the lower seat 12 and is connected to the automotive transmission oil circuit system. When the pressure in the oil circuit changes, the pusher 3 will reciprocate towards or away from the movable contact frame 221.

[0040] The reset assembly 4 includes a reset spring 41 and a limiting protrusion 42. There are two reset springs 41, which are located on the side of the two connecting arms 2212 facing the plug 11. The two ends of the reset springs 41 are connected to the plug 11 and the two sides of the connecting arms 2212 facing each other. The reset springs 41 can press against the moving contact 221 and push it in the direction of the pusher 3. The reset springs 41 can provide a stable and reliable reset force for the moving contact 221, ensuring that the moving contact 222 quickly returns to the initial position after completing the trigger electrical signal.

[0041] The limiting protrusion 42 is cylindrical in shape and is fixed on the side of the plug 11 facing the connecting arm 2212. There are two limiting protrusions 42, which are located inside the two return springs 41 respectively. The limiting protrusions 42 can effectively limit the deformation range of the return springs 41, prevent the return springs 41 from failing due to excessive deformation during compression or stretching, and ensure that the process of converting pressure signals into electrical signals is more stable and reliable.

[0042] As attached Figure 3 and attached Figure 5 As shown, a first annular groove 14 is provided on the inner wall of the active cavity 13 on the side of the moving contact frame 221 facing the pusher 3. A sealing gasket 5 is covered in the first annular groove 14. The sealing gasket 5 is made of rubber and includes a sealing end 51 perpendicular to the inner wall of the active cavity 13. The sealing end 51 is annular in shape. A limiting end 52 is fixed on the circumferential side wall of the sealing end 51, and the limiting end 52 is distributed facing the inner wall of the active cavity 13. The sealing gasket 5 divides the active cavity 13 into a switching cavity 15 and a pusher cavity 16. The switching cavity 15 is equipped with a switching assembly 2, and the pusher 3 is equipped in the pusher cavity 16. The sealing gasket 5 effectively prevents oil in the oil circuit system from leaking from the pusher cavity 16 into the switching cavity 15, thereby significantly improving the sealing performance of the pressure switch.

[0043] A limiting ring 6 is also provided inside the switch cavity 13 on the side of the sealing gasket 5 facing away from the pusher 3. A second annular groove 17 is provided on the inner wall of the switch cavity 15 on the side of the first annular groove 14 facing away from the pusher 3. The limiting ring 6 is covered and fixed in the second annular groove 17. The limiting ring 6 is made of metal. The limiting ring 6 is located on the outer periphery of the moving contact frame 221. The side of the limiting ring 6 facing the pusher 3 abuts against the sealing gasket 5. The metal limiting ring 6 has a low thermal expansion and contraction rate. In the alternating high temperature and low temperature environment, it can stably compress the sealing gasket 5 and prevent the sealing gasket 5 from losing its sealing effect due to material shrinkage and deformation. It further prevents the sealing gasket 5 from shifting or failing due to insufficient compression force.

[0044] A first annular protrusion 61 is fixed on the inner circumferential sidewall of the limiting ring 6 facing the sealing end 51. The first annular protrusion 61 is annular and abuts against the side of the sealing end 51 facing away from the pusher 3. The first annular protrusion 61 and the limiting end 52 are distributed facing each other. When the pressure switch is working in a high-temperature environment, the sealing gasket 5 may deform or change position due to thermal expansion and contraction. The first annular protrusion 61 and the limiting end 52 cooperate with each other to significantly enhance the axial positioning stability of the sealing gasket 5, effectively prevent the sealing gasket 5 from axially shifting during the movement of the moving contact frame 221, and thus improve the overall sealing performance and working reliability of the pressure switch.

[0045] Inside the switch cavity 15, a fixing ring 7 is provided on the side of the limiting ring 6 facing the plug 11. The fixing ring 7 is ring-shaped, and a ring edge 71 is fixed on the outer peripheral sidewall of the fixing ring 7 facing the sealing gasket 5. The fixing ring 7 is located on the outer periphery of the moving contact 221. The fixing ring 7 provides additional limiting and guiding functions for the moving contact 221, ensuring that the moving contact 221 moves more smoothly up and down, and effectively reducing its deviation and shaking.

[0046] A second annular protrusion 62 is fixed on the inner circumferential sidewall of the limiting ring 6 facing the fixed ring 7. The second annular protrusion 62 is annular and is distributed facing the ring edge 71. The second annular protrusion 62 and the ring edge 71 cooperate with each other to effectively limit the position of the fixed ring 7, preventing the fixed ring 7 from being displaced due to vibration or impact during long-term use. This ensures the precise cooperation between the fixed ring 7 and the moving contact frame 221, improves the stability of the overall structure, enhances the reliability of the pressure switch under complex working conditions, and ensures that the process of converting the pressure signal into an electrical signal is more accurate and stable.

[0047] As attached Figure 5 and attached Figure 6The switch cavity 15 shown has a third annular groove 18 on the side of the second annular groove 17 facing away from the first annular groove 14. During cold extrusion molding, the third annular groove 18 covers the surface of the limiting ring 6 and forms a limiting retaining ring 181. The limiting retaining ring 181 abuts against the limiting ring 6, so that the limiting ring 6 is limited and fixed between the second annular groove 17 and the third annular groove 18. This design not only strengthens the positioning function of the limiting ring 6 and prevents it from loosening or falling off due to vibration or impact during use, but also further improves the overall structural stability and ensures the reliable operation of the pressure switch under various working conditions.

[0048] Working principle

[0049] When the pressure at the rear end of the pusher 3 is normal, the return spring 41 between the connecting arm 2212 and the plug 11 body is in a compressed state. The return spring 41 will push the connecting arm 2212 down. The downward movement of the connecting arm 2212 will synchronously drive the moving contact 222 to press against the two stationary contact pieces 211 in the same group to ensure that the transmission surface and the contact surface 212 can be tightly connected. The pressure switch is in the normally closed state.

[0050] When the pressure at the rear end of the pusher 3 is greater than the normal state, the inner push rod 32 will press against the outer push rod 31 under the action of the rear end pressure and move towards the plug 11. The outer push rod 31 will push towards the movable cavity 13 and abut against the sealing gasket 5. At the same time, the outer push rod 31 will synchronously drive the trigger arm 2211 to push towards the plug 11. As a result, the distance between the connecting arm 2212 and the plug 11 will decrease. The return spring 41 will continue to compress under the pressure of the connecting arm 2212 and the plug 11 body. The moving contact 222 will synchronously move towards the plug 11. As a result, the moving contact 222 will no longer abut against the two stationary contact pieces 211 in the same group. The pressure switch is in the normally open state.

[0051] When the pressure at the rear end of the pusher 3 returns to normal, the elastic potential energy stored in the return spring 41 will be released, and the return spring 41 will press the connecting arm 2212 down, and the moving contact 222 will re-abut against the two stationary contacts 211 in the same group, and the pressure switch will return to the normally closed state.

[0052] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of protection claimed in this application.

Claims

1. A pressure switch with high electrical connection stability, comprising a housing (1), characterized in that, The housing (1) has a movable cavity (13) inside, and a switch assembly (2) is installed inside the movable cavity (13). The switch assembly (2) includes a stationary contact (21) and a movable contact (22). There are two stationary contacts (21). The two stationary contacts (21) are located on the same side and have inclined stationary contact pieces (211). The two stationary contact pieces (211) are inclined towards each other and close together. A power connector (23) penetrating outside the housing (1) is electrically connected to the stationary contact pieces (211). The inclined surfaces of the stationary contact pieces (211) are the contact surfaces (212). The moving contact (22) includes a connected moving contact frame (221) and a moving contact (222). The moving contact (222) is located between the two contact surfaces (212). The side of the moving contact (222) located between the two contact surfaces (212) is the touching surface (2221). The touching surface (2221) is a frustum and is located between the two contact surfaces (212). The movable contact frame (221) is provided with a pusher (3) on one side along the axial direction of the movable contact surface (2221), and a reset assembly (4) is provided on the other side along the axial direction of the contact surface (2221). The pusher (3) is slidably connected inside the housing (1), and the sliding direction is towards or away from the switch assembly (2). The end of the pusher (3) facing away from the switch assembly (2) extends through and out of the housing (1). The reset assembly (4) faces the pusher (3) and pushes against the movable contact frame (221).

2. The pressure switch with high electrical connection stability according to claim 1, characterized in that, The number of moving contacts (222) is 2, and two opposing inclined stationary contact pieces (211) are installed on both sides of the two contact pieces.

3. A pressure switch with high electrical connection stability according to claim 2, characterized in that, The moving contact frame (221) includes a trigger arm (2211) and a connecting arm (2212). The trigger arm (2211) protrudes towards the pusher (3). Two connecting arms (2212) are fixed on the side of the trigger arm (2211) facing the moving contact frame (221), and two moving contacts (222) are respectively fixed on the two connecting arms (2212).

4. A pressure switch with high electrical connection stability according to claim 1, characterized in that, The reset assembly (4) includes a reset spring (41), one end of which abuts against the inner wall of the housing (1), and the other end of which abuts against the moving contact frame (221) and pushes towards the pusher (3).

5. A pressure switch with high electrical connection stability according to claim 4, characterized in that, The reset assembly (4) also includes a limiting protrusion (42) located inside the reset spring (41), and the limiting protrusion (42) is fixedly connected to the inner wall of the housing (1).

6. A pressure switch with high electrical connection stability according to claim 1, characterized in that, The inner wall of the movable cavity (13) is provided with a first annular groove (14) on the side of the moving contact frame (221) facing the pusher (3). The first annular groove (14) is covered with a sealing gasket (5). The sealing gasket (5) divides the movable cavity (13) into a switching cavity (15) and a pusher cavity (16). The inner wall of the movable cavity (13) is provided with a second annular groove (17) on the side of the first annular groove (14) facing away from the pusher (3). The second annular groove (17) is covered with a limiting ring (6). 6) The limiting ring (6) is made of hard material. The side of the limiting ring (6) facing the pusher (3) abuts against the sealing gasket (5). The inner wall of the active cavity (13) is provided with a third ring groove (18) on the side of the second ring groove (17) facing away from the pusher (3). When the third ring groove (18) is cold extruded, the third ring groove (18) covers the surface of the limiting ring (6) and forms a limiting ring (181), and the limiting ring (181) abuts against the side of the limiting ring (6) facing away from the sealing gasket (5).

7. A pressure switch with high electrical connection stability according to claim 6, characterized in that, The limiting ring (6) has a first annular protrusion (61) on the inner circumferential sidewall facing the sealing gasket (5), and the first annular protrusion (61) abuts against the side of the sealing gasket (5) facing away from the pusher (3). The sealing gasket (5) includes a sealing end (51), and a limiting end (52) facing the first annular protrusion (61) is fixed on the circumferential sidewall of the sealing end (51).

8. A pressure switch with high electrical connection stability according to claim 6, characterized in that, The switch cavity (15) is provided with a fixing ring (7) located on the side of the limiting ring (6) facing away from the sealing gasket (5). The fixing ring (7) is located on the outer periphery of the moving contact frame (221). The fixing ring (7) has a ring edge (71) fixed on the side of the fixing ring (7) facing the sealing gasket (5). The inner peripheral sidewall of the limiting ring (6) facing the fixing ring (7) is provided with a second annular protrusion (62), and the second annular protrusion (62) and the ring edge (71) are distributed in opposite directions.

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