Direct acting normally closed relay

Abstract

The object of the present invention is to provide a snap-on direct-acting normally closed relay with low energy consumption, small size and low cost. A snap-on direct-acting normally closed relay comprises a housing, wherein a magnetic circuit part, a moving contact part and a stationary contact part are arranged in the housing, wherein the magnetic circuit part comprises a coil frame, wherein one end of an L-shaped yoke is fixed to an iron core, and the other end of the L-shaped yoke is located on the upper side of the coil frame and cooperates with an armature, wherein the attraction end of the armature is located on the left or right side of the iron core, wherein the contact end of the armature is located on the upper side of the yoke and on the lower side of the lower end of the push rod, wherein the moving contact part comprises a moving spring piece and a moving contact, wherein the stationary contact part comprises a stationary spring piece and a stationary contact, wherein the stationary contact corresponds to the moving contact one by one and is located below the moving contact, wherein the moving spring piece contacts the end of a main spring, wherein the moving spring piece moves downward under the action of the main spring, wherein the coil is energized to move the attraction end toward the end of the iron core away from the yoke, and wherein the contact end drives the moving spring piece to move upward.

Description

Technical Field

[0001] The invention relates to a snap-on direct-acting normally closed relay. Background Art

[0002] Existing direct-acting relays, such as the patent with application number 201610276487.5, discloses a high-voltage DC relay magnetic circuit system, including a U-shaped yoke, a lower magnetic cylinder fixed in the U-shaped yoke, a coil frame sleeved outside the lower magnetic cylinder, and a moving iron core with a lower end located in the lower magnetic cylinder. A yoke plate is provided above the moving iron core, and a travel gap is formed between the lower end surface of the yoke plate and the upper end surface of the moving iron core. An upper magnetic cylinder arranged in a ring shape is formed on the outer periphery of the travel gap. The moving iron core can reciprocate up and down in the upper magnetic cylinder. The upper magnetic cylinder is fixed to the yoke plate, the moving iron core is fixed to the lower end of the push rod, and the upper section of the push rod is located on the yoke plate so as to be fixed to the moving spring. The moving iron core is driven to move up and down by the up and down movement of the moving spring, so that the moving contact on the moving spring is in contact with or disconnected from the static contact.

[0003] Due to the existence of the moving iron core and the lower magnetic tube, the coil frame must be made very large. At the same time, in order to ensure that the moving iron core can move up and down, the number of coil turns wound on the coil frame is large, which makes the relay larger in size, higher in energy consumption, and the relay has more parts and higher cost. Summary of the invention

[0004] The object of the present invention is to provide a snap-on direct-acting normally closed relay with low energy consumption, small size and low cost.

[0005] To achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a snap-on direct-acting normally closed relay, comprising a housing, wherein a magnetic circuit part, a moving contact part and a stationary contact part are arranged in the housing, wherein the magnetic circuit part comprises a coil frame and a coil arranged on the coil frame, wherein the coil frame is formed with a through slot running through left and right, wherein an iron core is arranged in the through hole, wherein one end of an L-shaped yoke is fixed to the iron core, and the other end of the L-shaped yoke is located on the upper side of the coil frame and cooperates with an armature, wherein the two ends of the armature are respectively a touch end and an attraction end, wherein the attraction end of the armature is located on the left or right side of the iron core, and the touch end of the armature is located on the left or right side of the iron core. The end is located on the upper side of the yoke and on the lower side of the lower end of the push rod, the moving contact part includes a moving spring fixed on the push rod and moving contacts arranged at the left and right ends of the moving spring, the static contact part includes a static spring and a static contact fixed to the static spring, the static contact corresponds to the moving contact one by one and is located below the moving contact, the moving spring contacts are in contact with the end of the main spring, and the moving spring moves downward under the action of the main spring, the coil is energized to move the attraction end of the armature toward the end of the side of the iron core away from the yoke, and the contact end of the armature moves upward to drive the push rod and the moving spring to move upward.

[0006] The present invention replaces the movement of the moving iron core by the movement of the armature, so that the coil frame is arranged horizontally instead of vertically, so as to reduce the space on the height of the relay. At the same time, only the iron core is arranged in the coil frame without a magnetic sleeve, so the coil frame can be made smaller, the number of turns and the volume of the coil are smaller, and the power consumption during use is smaller to achieve the reduction of the volume of the relay. Among them, the connection and fixing method of the armature and the yoke adopts the fixing method of the armature in the conventional snap-on relay. The magnetic circuit part of the present invention has fewer parts, lower manufacturing and assembly costs, and can adapt to small-volume housings to keep the relay of the present invention miniaturized. The relay of the present invention will only make the armature move when the coil is energized, so that the relay has a normally closed function when it is not energized. Among them, the main spring can adopt a compression spring or a tension spring to ensure the contact between the moving contact and the static contact when it is not energized.

[0007] Preferably, a plurality of return force springs are connected between the movable spring sheet and the housing, a hook at one end of the return force spring is a connecting end and is connected to the movable spring sheet, a hook at the other end of the return force spring is a fixed end and is hooked onto a sliding rod, the sliding rod is fixed to the housing, and the fixed end of the return force spring is located above the movable spring sheet.

[0008] The return spring is used to assist the push rod to move upward after power is turned on, so as to achieve rapid disconnection between the fast moving and static contacts. The hook at the upper end of the return spring is a fixed end and is hooked on the slide bar. The hooks at the upper ends of the return springs can slide on the slide bar to adjust their positions to ensure the stability of the moving spring.

[0009] Preferably, a tray is sleeved on the push rod, the tray has an upper through hole penetrating up and down for the push rod to pass through, and the tray is fixed to the shell, the main spring is arranged between the tray and the movable spring sheet, and the main spring is sleeved on the push rod.

[0010] The tray and the housing can be fixed in a variety of ways according to needs, such as forming a slot for the tray on the housing, or integrally forming the housing and the tray, or fixing the tray in the housing by gluing, etc. The tray is used to limit the upper end of the main spring, which is sleeved on the push rod and located between the tray and the moving spring.

[0011] Preferably, the return force spring includes a left return force spring and a right return force spring, the slide rod includes a left slide rod and a right slide rod, the left and right ends of the movable spring sheet are respectively formed with a left movable spring sheet protrusion and a right movable spring sheet protrusion, the left movable spring sheet protrusion and the right movable spring sheet protrusion are both formed with a hook groove, the hook groove is located on the upper side of the movable spring sheet, the hook groove of the left movable spring sheet protrusion is used to cooperate with the left return force spring connecting end, and the hook groove of the right movable spring sheet protrusion is used to cooperate with the right return force spring connecting end.

[0012] Since both ends of the moving spring are respectively tightened to act on the slide bar, the left return spring and the right return spring always have a force to prevent the moving spring from rotating horizontally, thereby ensuring the precise alignment of the moving contact and the static contact, ensuring that the moving and static contacts can reliably and accurately contact, and ensuring the performance of the relay of the present invention. Among them, the hook groove is located on the upper side of the moving spring, that is, no part of the return spring is located between the moving spring and the static spring, and the arc generated by the disconnection of the moving and static contacts will not affect the return spring, and the return spring will not be damaged. No part of the hook groove is located between the moving spring and the static spring, and the arc generated by the disconnection of the moving and static contacts will not affect the return spring, and the return spring will not be damaged.

[0013] Preferably, the shell is composed of a shell body and a cover plate, the shell body is formed with an accommodating cavity for accommodating a magnetic circuit part, a moving contact part and a static contact part, a connecting rod is connected between the left slide bar and the right slide bar to form a U-shaped structure, one end of the left slide bar and one end of the right slide bar are both fixed to the shell body, and the connecting rod is connected between the other end of the left slide bar and the other end of the right slide bar, the shell body is formed with a fixing hole for positioning the end of the left slide bar and the end of the right slide bar, a first shell protrusion is formed in the accommodating cavity of the shell body, the first shell protrusion has a connecting rod positioning groove that penetrates left and right and opens toward the cover plate side, the connecting rod is located in the connecting rod positioning groove; or the left slide bar and the right slide bar are respectively parts of a fixing rod, the fixing rod is U-shaped, and both ends of the fixing rod are fixed to the shell, and the shell body is formed with a fixing hole for positioning the end of the fixing rod; the left slide bar and the right slide bar are both parts of the same fixing rod; at least one end of the fixing rod is fixed to the shell body.

[0014] When the left slide bar and the right slide bar are connected together by a connecting rod to form a U shape, the connecting rod can be made shorter to reduce the consumption of parts and components, and the return spring is tilted at this time; the connecting rod positioning groove protruding from the first shell is used for the upper and lower limit of the connecting rod to prevent the left slide bar and the right slide bar from tilting; when the left slide bar and the right slide bar are respectively part of a U-shaped fixed rod, it is convenient to assemble the return spring, and there is no need to pull the return spring apart to tilt the return spring, so that a return spring with smaller elasticity can be used; when the left slide bar and the right slide bar are part of the same fixed rod, so that the fixing of the fixed rod and the shell is more convenient, the shape and fixing method of the fixed rod at this time are selected according to the needs, and the fixed rod can be selected in various shapes such as "one" shape, U shape or L shape. Among them, the fixing of the left and right slide bars to the shell can be achieved by glue fixation.

[0015] Preferably, an insulating block is fixed to the actuating end of the armature, a concave arc groove is formed on the upper end surface of the insulating block, the lower end of the push rod is spherical, and the lower end of the push rod is always located in the arc groove.

[0016] The insulating block is provided to increase the creepage distance, and the arc groove on the insulating block is provided to prevent the lower end of the push rod from being separated from the insulating block, so that the upward movement of the insulating block can immediately move the push rod upward.

[0017] Preferably, the armature has a plurality of first positioning protrusions protruding outwards formed on the touch end, and a plurality of first concave positioning grooves formed on the touch end of the armature. The insulating block is fixed on the touch end of the armature, and the insulating block has a second positioning groove matched with the first positioning protrusion, and the insulating block has a second positioning protrusion matched with the second positioning groove; the upper end surface of the yoke is concave to form a sink groove, and the sink groove is used to make way for the lower end of the insulating block. The above arrangement prevents the insulating block from separating from the touch end of the armature, so that the fixing effect of the insulating block and the armature is better.

[0018] Preferably, an elastic member is fixed on the inner wall of the shell, and the elastic member is located between the inner wall of the shell and the attraction end of the armature. When the coil is energized, the attraction end of the armature moves away from the core to contact the elastic member.

[0019] The leaf spring is used to limit the armature and position the armature to prevent the armature from shaking after the relay is powered off. Various methods can be selected to fix the end of the leaf spring to the housing as needed, such as slot-type tight fit, glue fixation, fastener fixation, etc.

[0020] Preferably, a fixing plate is fixed in the shell, the fixing plate is formed with a lower through hole penetrating up and down for the push rod to pass through, the lower end surface of the fixing plate extends downward or the upper end surface extends upward to form an annular guide protrusion; a second shell protrusion is formed in the shell, the second shell protrusion is formed with a fixing plate positioning groove for accommodating the fixing plate, the second shell protrusion is formed with a lower making way groove penetrating up and down to make way for the push rod, and the lower making way groove is communicated with the fixing plate positioning groove.

[0021] The fixing plate and the guide protrusion are used to guide the push rod to ensure that the push rod moves up and down smoothly and stably; wherein, the setting of the guide protrusion can make the fixing plate thinner.

[0022] Preferably, the upper end surface of the movable spring is concave to form an annular groove, the lower end of the main spring is located in the annular groove, the push rod is formed with an annular groove or an arc groove that matches the retaining spring, and the movable spring is supported on the upper side of the retaining spring; or the push rod includes at least a first section and a second section from top to bottom, the diameter of the first section is smaller than the diameter of the second section to form a step structure, the movable spring is sleeved outside the first section and supported above the second section, and a support plate is provided outside the first section, and under the action of the main spring, the support plate is restricted between the second section and the movable spring. The above arrangement facilitates the fixation of the movable spring and the push rod, and the support plate or the retaining spring is used to support the movable spring.

[0023] The present invention has the advantages of smaller volume, lower power consumption and lower production and assembly cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 A schematic diagram of the structure of the present invention without the cover plate;

[0025] Figure 2 Another structural schematic diagram of the present invention without the cover plate;

[0026] Figure 3 A schematic diagram of a structure of the present invention without a return spring;

[0027] Figure 4 A schematic diagram of the structure of the housing body of the present invention;

[0028] Figure 5 A schematic diagram of the structure of the left slide bar and the right slide bar of the present invention. DETAILED DESCRIPTION

[0029] The present invention will be further described below based on the accompanying drawings and specific embodiments.

[0030] Depend on Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 As shown, a snap-on direct-acting normally closed relay of the present invention comprises a housing, which is composed of a housing body 1 and a cover plate. The housing body 1 is formed with an accommodating cavity 10 for accommodating a magnetic circuit part, a moving contact part and a stationary contact part.

[0031] Depend on Figures 1 to 3As shown, the magnetic circuit part includes a coil frame 2 and a coil arranged on the coil frame. The coil frame 2 is formed with a through slot running through left and right, and an iron core 21 is arranged in the through hole. One end of an L-shaped yoke 22 is fixed to the iron core 21, and the other end of the L-shaped yoke 22 is located on the upper side of the coil frame 2 and cooperates with an armature 23. The two ends of the armature 23 are a touch end 231 and an attraction end 232 respectively. The attraction end 232 of the armature 23 is located on the left side of the iron core 21, and the touch end 231 of the armature 23 is located on the upper side of the yoke 22 and on the lower side of the lower end of the push rod 3.

[0032] The moving contact part includes a moving spring piece 4 fixed on the push rod 3 and moving contacts 41 arranged at the left and right ends of the moving spring piece 4. The static contact part includes a static spring piece 5 and a static contact 51 fixed to the static spring piece 5. The static contact 51 corresponds to the moving contact 41 one by one and is located below the moving contact 41. The moving spring piece 4 contacts the end of the main spring 31. The moving spring piece 4 moves downward under the action of the main spring 31. The coil is energized to move the attraction end 232 of the armature 23 toward the end of the side of the iron core 21 away from the yoke 22, and the contact end 231 of the armature 23 moves upward to drive the push rod 3 and the moving spring piece 4 to move upward.

[0033] A plurality of return springs are connected between the movable spring piece 4 and the housing, and the return springs include a left return spring 32 and a right return spring 33. A hook at one end of the return spring is a connecting end 321 and is connected to the movable spring piece 4, and a hook at the other end of the return spring is a fixed end 331 and is hooked on the slide bar. The axis of the slide bar is perpendicular to the axis of the push rod, and the fixed end 331 of the return spring is located above the movable spring piece 4. The slide bar includes a left slide bar 34 and a right slide bar 35. A left movable spring protrusion 42 and a right movable spring protrusion 43 are formed at the left and right ends of the movable spring piece 4, respectively. The left movable spring protrusion 42 and the right movable spring protrusion 43 are both formed with a hook groove 40, and the hook groove 40 is located on the upper side of the movable spring piece 4. The hook groove of the left movable spring protrusion 42 is used to match the connecting end of the left return spring 32, and the hook groove of the right movable spring protrusion 43 is used to match the connecting end of the right return spring 33.

[0034] Depend on Figure 2 , Figure 4 , Figure 5 As shown, a connecting rod 36 is connected between the left slide bar 34 and the right slide bar 35 to form a U-shaped structure, one end of the left slide bar 34 and one end of the right slide bar 35 are fixed to the shell body 1, and the connecting rod 36 is connected between the other end of the left slide bar 34 and the other end of the right slide bar 35, and the shell body 1 is formed with a fixing hole 19 for positioning the end of the left slide bar 34 and the end of the right slide bar 35, and a first shell protrusion 11 is formed in the accommodating cavity 10 of the shell body 1, and the first shell protrusion 11 has a connecting rod positioning groove 13 that penetrates from left to right and opens toward the cover plate side, and the connecting rod 36 is located in the connecting rod positioning groove 13.

[0035] Depend on Figures 1 to 5As shown, a tray 6 is sleeved on the push rod 3, and the tray 6 has an upper through hole that penetrates from top to bottom for the push rod 3 to pass through. The lower end surface of the first shell protrusion 11 extends upward to form a tray receiving groove 14 for receiving the tray 6. The first shell protrusion 11 is formed with an upper clearance groove 12 that penetrates downward to make way for the upper end of the push rod. The upper clearance groove 12, the tray receiving groove 14 and the connecting rod positioning groove 13 are connected. The tray 6 is stuck in the tray receiving groove 14 and fixed by glue. The main spring 31 is arranged between the tray 6 and the movable spring 4, and the main spring 31 is sleeved on the push rod 3. The upper end surface of the movable spring 4 is concave to form an annular groove 45, and the lower end of the main spring 31 is located in the annular groove 45. The push rod 3 is formed with an annular groove or an arc groove that matches the retaining spring 30, and the movable spring 4 is supported on the upper side of the retaining spring 30.

[0036] Depend on Figures 1 to 3 As shown, the contact end 231 of the armature 23 is fixed with the insulating block 7, and the upper end surface of the insulating block 7 is formed with a concave arc groove 71, and the lower end of the push rod 3 is spherical, and the lower end of the push rod 3 is always located in the arc groove 71. A plurality of first positioning protrusions protruding outward are formed on the contact end 231 of the armature 23, and a plurality of first concave positioning grooves are formed on the contact end 231 of the armature 23. The insulating block 7 is formed by injection molding on the contact end 231 of the armature 23, and the insulating block 7 is formed with a second positioning groove matched with the first positioning protrusion, and the insulating block is formed with a second positioning protrusion matched with the second positioning groove. Among them, the upper end surface of the yoke 22 is concave to form a sinking groove 221, and the sinking groove 221 is used to make way for the lower end of the insulating block 7.

[0037] An elastic member 8 is fixed on the inner wall of the housing body 1 accommodating chamber, and the elastic member is located between the inner wall of the accommodating chamber and the armature attraction end 232. When the coil is energized, the attraction end of the armature moves away from the iron core to contact the elastic member. The elastic member 8 of this embodiment is a leaf spring, and the leaf spring 8 is bent so that one end of the leaf spring 8 is fixed to the housing body 1. When the coil is energized, the attraction end 232 of the armature moves away from the iron core to contact the other end of the leaf spring. The leaf spring 8 is bent to form a V-shaped structure, and the opening of the V-shaped structure formed by the leaf spring 8 is arranged upward.

[0038] A fixing plate 9 is fixed in the accommodating cavity 10 of the housing body 1. The fixing plate 9 is formed with a lower through hole penetrating up and down for the push rod 3 to pass through. The lower end surface of the fixing plate 9 extends downward to form an annular guide protrusion 91. The housing body 1 is formed with a second housing protrusion 16. The second housing protrusion 16 is formed with a fixing plate positioning groove 17 for accommodating the fixing plate 9. The second housing protrusion 16 is formed with a lower making way groove 18 penetrating up and down to make way for the push rod. The lower making way groove 18 is communicated with the fixing plate positioning groove 17.

[0039] The present invention replaces the movement of the moving iron core by the movement of the armature, so that the coil frame is arranged horizontally instead of vertically, so as to reduce the space on the height of the relay. At the same time, only the iron core is arranged in the coil frame without a magnetic sleeve, so the coil frame can be made smaller, and the number of turns and volume of the coil are smaller, so as to achieve a reduction in the volume of the relay and lower power consumption when in use. Among them, the connection and fixing method of the armature and the yoke adopts the fixing method of the armature in the conventional snap-on relay. The magnetic circuit part of the present invention has fewer parts, lower manufacturing and assembly costs, and can adapt to small-volume housings to keep the relay of the present invention miniaturized. The relay of the present invention will only make the armature move when the coil is energized, so that the relay has a normally closed function when it is not energized. The present invention has the advantages of smaller volume, lower power consumption, and lower production and assembly costs.

Claims

1. A snap-action direct-acting normally closed relay, characterized in that The invention comprises a shell, wherein a magnetic circuit part, a moving contact part and a stationary contact part are arranged in the shell, wherein the magnetic circuit part comprises a coil frame and a coil arranged on the coil frame, wherein the coil frame is formed with a through slot penetrating left and right, wherein an iron core is arranged in the through hole, wherein one end of an L-shaped yoke is fixed to the iron core, and the other end of the L-shaped yoke is located on the upper side of the coil frame and matched with an armature, wherein the two ends of the armature are a touch end and an attraction end respectively, wherein the attraction end of the armature is located on the left or right side of the iron core, and the touch end of the armature is located on the upper side of the yoke and on the lower side of the lower end of the push rod, wherein the moving contact part comprises a moving spring piece fixed to the push rod and moving contacts arranged at the left and right ends of the moving spring piece, A fixing plate is fixed in the shell, and the fixing plate is formed with a lower through hole that passes through the upper and lower parts for the push rod to pass through. The static contact part includes a static spring sheet and a static contact fixed to the static spring sheet. The static contact corresponds to the moving contact one by one and is located below the moving contact. The moving spring sheet contacts the end of the main spring. The moving spring sheet moves downward under the action of the main spring. The coil is energized to move the attraction end of the armature toward the end of the side of the iron core away from the yoke iron, and the contact end of the armature moves upward to drive the push rod and the moving spring sheet to move upward.

2. The snap-action direct-acting normally closed relay according to claim 1, characterized in that A plurality of return force springs are connected between the movable spring sheet and the housing, a hook at one end of the return force spring is a connecting end and is connected to the movable spring sheet, a hook at the other end of the return force spring is a fixed end and is hooked onto a sliding rod, the sliding rod is fixed to the housing, and the fixed end of the return force spring is located above the movable spring sheet.

3. The snap-action direct-acting normally closed relay according to claim 1, characterized in that The push rod is sleeved with a tray, the tray has an upper through hole penetrating up and down for the push rod to pass through, and the tray is fixed to the shell, the main spring is arranged between the tray and the moving spring sheet, and the main spring is sleeved on the push rod.

4. The snap-action direct-acting normally closed relay according to claim 2, characterized in that The return force spring includes a left return force spring and a right return force spring, the slide bar includes a left slide bar and a right slide bar, the left and right ends of the movable spring sheet are respectively formed with a left movable spring sheet protrusion and a right movable spring sheet protrusion, the left movable spring sheet protrusion and the right movable spring sheet protrusion are both formed with a hook groove, the hook groove is located on the upper side of the movable spring sheet, the hook groove of the left movable spring sheet protrusion is used to cooperate with the left return force spring connecting end, and the hook groove of the right movable spring sheet protrusion is used to cooperate with the right return force spring connecting end.

5. The snap-action direct-acting normally closed relay according to claim 4, characterized in that The shell is composed of a shell body and a cover plate, the shell body is formed with a accommodating cavity for accommodating a magnetic circuit part, a moving contact part and a static contact part, a connecting rod is connected between the left slide bar and the right slide bar to form a U-shaped structure, one end of the left slide bar and one end of the right slide bar are both fixed to the shell body, and the connecting rod is connected between the other end of the left slide bar and the other end of the right slide bar, the shell body is formed with a fixing hole for positioning the end of the left slide bar and the end of the right slide bar, a first shell protrusion is formed in the accommodating cavity of the shell body, the first shell protrusion has a connecting rod positioning groove that penetrates left and right and opens toward the cover plate side, the connecting rod is located in the connecting rod positioning groove; or the left slide bar and the right slide bar are respectively parts of a fixing rod, the fixing rod is U-shaped, and both ends of the fixing rod are fixed to the shell, and the shell body is formed with a fixing hole for positioning the end of the fixing rod; the left slide bar and the right slide bar are both parts of the same fixing rod; at least one end of the fixing rod is fixed to the shell body.

6. The snap-action direct-acting normally closed relay according to claim 1, characterized in that An insulating block is fixed to the actuating end of the armature, a concave arc groove is formed on the upper end surface of the insulating block, the lower end of the push rod is spherical, and the lower end of the push rod is always located in the arc groove.

7. The snap-action direct-acting normally closed relay according to claim 6, characterized in that A plurality of first positioning protrusions protruding outward are formed on the contact end of the armature, and a plurality of first concave positioning grooves are formed on the contact end of the armature. The insulating block is fixed on the contact end of the armature, and the insulating block is formed with a second positioning groove matching with the first positioning protrusion, and the insulating block is formed with a second positioning protrusion matching with the second positioning groove; the upper end surface of the yoke is concave to form a sink groove, and the sink groove is used to make way for the lower end of the insulating block.

8. The snap-action direct-acting normally closed relay according to claim 1, characterized in that An elastic member is fixed on the inner wall of the shell, and the elastic member is located between the inner wall of the shell and the attraction end of the armature. When the coil is energized, the attraction end of the armature moves away from the iron core to contact the elastic member.

9. The snap-action direct-acting normally closed relay according to claim 1, characterized in that The lower end surface of the fixed plate extends downward or the upper end surface extends upward to form an annular guide protrusion; a second shell protrusion is formed in the shell, and the second shell protrusion is formed with a fixed plate positioning groove for accommodating the fixed plate, and the second shell protrusion is formed with a lower making way groove that runs through the upper and lower parts to make way for the push rod, and the lower making way groove is communicated with the fixed plate positioning groove.

10. The snap-action direct-acting normally closed relay according to claim 3, characterized in that The upper end surface of the movable spring piece is concave to form an annular groove, the lower end of the main spring is located in the annular groove, and an annular groove or an arc groove matching the retaining spring is formed on the push rod, and the movable spring piece is supported on the upper side of the retaining spring; or the push rod includes at least a first section and a second section from top to bottom, the diameter of the first section is smaller than the diameter of the second section to form a step structure, the movable spring piece is sleeved outside the first section and supported above the second section, and a support plate is provided outside the first section, and under the action of the main spring, the support plate is confined between the second section and the movable spring piece.

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