Automatic reset push valve core

Abstract

The present invention discloses an automatic reset pressing valve core, comprising an upper shell and a lower shell, wherein a pressing rod, a rotating shaft, and a spring are installed in the upper shell, a fixed valve plate and a movable valve plate are installed in the lower shell, a dial is connected between the movable valve plate and the rotating shaft in a circumferential transmission, a guide groove is provided in the upper shell, a guide inclined surface is provided on one side of the guide groove, a latching tooth is provided on the rotating shaft, the latching tooth is slidably fitted in the guide groove, a driving surface is provided at the bottom of the pressing rod, the driving surface is inclined, and the inclination directions of the driving surface and the guiding inclined surface are opposite. For the automatic reset pressing valve core, when the pressing rod is pressed, the movable valve plate rotates rapidly in the forward direction to change the valve core switch state, and when the pressing rod is released, the movable valve plate rotates rapidly in the reverse direction to automatically reset, so that the valve core returns to the initial switch state.

Description

Technical Field

[0001] The invention relates to a faucet valve core, in particular to an automatic reset pressing valve core. Background Art

[0002] The push-on valve core is a type of switch valve core. Due to its ease of use, it is increasingly used on faucets to control the on and off of water flow.

[0003] The Chinese patent with the patent number of 201810128083.0 discloses a push-to-open ceramic valve core, which is composed of an upper shell, a lower shell, a base, a moving ceramic plate, a static ceramic plate, a pressing rod (i.e., a button), a rotating shaft (i.e., a rotor), a dial, a spring, etc. The valve core adopts the pressing structure of an automatic pen when pressed. When the pressing rod is pressed, the rotating shaft rotates in one direction, and the rotating shaft drives the moving valve plate to rotate, thereby cooperating with the fixed valve plate to realize the opening and closing of the valve core. This valve core needs to be pressed twice during use to complete a complete opening and closing operation of the valve core, which is more troublesome in actual use, especially for some flushing valves that need to be in a water-discharging state for a long time and only need to be in a closed state for a short time. It is inconvenient to operate during use.

[0004] The Chinese patent No. 201620036335.3 discloses a push-type water-saving water valve, in which a buffer device is arranged between the top rod and the valve core, so as to play a buffering role. When the button of the water valve is pressed, the buffer block rotates and moves slowly downward, so that the water valve is in a connected state and the water valve discharges water; when the button is released, the buffer block slowly rotates in the opposite direction, and the assembly closes the water valve and cuts off the water discharge. Although this valve core can achieve automatic reset, the reset speed is slow and it is not suitable for use environments that require fast switching of the switch state. Summary of the invention

[0005] In view of the shortcomings of the prior art, the purpose of the present invention is to provide an automatically reset push valve core. When the push rod is pressed, the moving valve plate instantly and quickly rotates forward to change the switching state of the valve core. When the push rod is released, the moving valve plate instantly and quickly rotates reversely to automatically reset the valve core to restore its initial switching state.

[0006] The above technical objectives of the present invention are achieved through the following technical solutions: an automatic reset push valve core, including an upper shell body and a lower shell body, a pressing rod, a rotating shaft, and a spring are installed in the upper shell body, a fixed valve plate and a movable valve plate are installed in the lower shell body, a dial is arranged between the movable valve plate and the rotating shaft, a gear sleeve is arranged separately in the upper shell body, the gear sleeve and the upper shell body are circumferentially engaged, a guide groove is opened on the gear sleeve, a guide inclined surface is arranged on one side of the guide groove, a latching tooth is arranged on the rotating shaft, the latching tooth is slidably fitted in the guide groove, a driving surface is arranged at the bottom of the pressing rod, the driving surface is arranged at an inclination, and the inclination directions of the driving surface and the guide inclined surface are opposite.

[0007] Through the above technical solution, when the pressing rod is pressed down, the driving surface and the guiding inclined surface intersect, and the upper end of the latch tooth is between the driving surface and the guiding inclined surface. The latch tooth moves downward rapidly under the action of the driving surface and rotates along the guiding inclined surface. When the latch tooth rotates, the dial and the movable valve plate also rotate, thereby changing the initial switch state of the valve core. When the pressing rod is released, the latch tooth moves upward rapidly along the guiding inclined surface and rotates under the action of the spring. During this process, the rotation direction of the latch tooth is opposite to the rotation direction when pressed down, thereby driving the movable valve plate to rotate in the opposite direction and reset, so that the valve core returns to the initial switch state. The guide groove is arranged in this way, and the latch tooth has a large activity space. During the sliding process, it will only be restricted by the side of one side of the guide groove. Even if a certain deflection occurs, it will not get stuck, so that the latch tooth can slide flexibly in the guide groove and can achieve rapid sliding.

[0008] The valve plates have good sealing performance, and the resistance required for relative rotation of the two valve plates is small. When the latch teeth slide along the guide slope, they provide a small torque to drive the valve plates to rotate, thereby changing the switching state of the valve core, which is conducive to the rapid recovery of the valve core to its initial state.

[0009] The gear sleeve and the upper shell are separated, and the guide groove and the guide bevel are set on the gear sleeve. The two are processed separately, thereby reducing the processing difficulty of the gear sleeve and the upper shell. The upper shell can be obtained by machining using a variety of materials (such as copper, stainless steel, etc.), thereby breaking through the limitations of materials. Although the structure of the upper shell and the gear sleeve is not changed, the upper shell and the gear sleeve are set as one, and the copper upper shell can also be obtained by using the casting method, but the surface quality of the workpiece after casting is poor, and further processing is required to obtain a better surface roughness. If the upper shell is not further processed, and the pressing rod and the rotating shaft are directly assembled, the pressing rod and the rotating shaft will wear and get stuck during use, affecting the service life and use experience. Even if it is processed, the guide bevel is in the inner hole and is set in sections, and ordinary drilling and milling cannot be processed at all. The upper shell and the gear sleeve are set separately, which can overcome the above difficulties. The upper shell can be obtained by injection molding or by machining using metal bars. The gear sleeve can still be processed by injection molding, or the gear sleeve structure can be changed so that the guide bevel runs through the inner and outer walls of the gear sleeve, and it can be obtained by machining (processing the guide groove by a broaching machine and processing the guide bevel by a milling machine), and then the two are assembled to achieve the original function.

[0010] The rotating shaft is inserted in the pressing rod, the upper end of the spring is in contact with the rotating shaft, the lower end of the spring is in contact with the lower shell body, and the lower end of the dial is engaged with the movable valve plate through a claw, so that the movable valve plate can rotate with the rotation of the dial; a water inlet through hole is opened on the fixed valve plate, and a flow channel is provided on the movable valve plate. The number of the water inlet through holes and the flow channels is the same, both four, and they correspond one to one.

[0011] Preferably, a first sliding slope and a second sliding slope are provided on the top of the latching tooth, the first sliding slope is in sliding cooperation with the driving surface, and the second sliding slope is in sliding cooperation with the guiding slope.

[0012] Through the above technical solution, the contact area between the top of the latch tooth and the driving surface and the sliding inclined surface can be increased, thereby reducing the wear of the top of the latch tooth, while making the sliding smoother, reducing the pressure required when pressing the pressing rod, and facilitating use.

[0013] Preferably, the guide groove is arranged axially.

[0014] Through the above technical solution, the axial setting of the guide groove can completely avoid the locking tooth from colliding with the side of the guide groove where the guide slope is not set during the sliding process, thereby avoiding sliding jamming and affecting the rapid rotation of the locking tooth and the resetting of the movable valve plate.

[0015] Preferably, a clamping block is arranged on the side of the pressing rod, the guiding inclined surface is arranged at the lower part of the guiding groove, and the clamping block is arranged at the upper part of the guiding groove.

[0016] Through the above technical solution, the clamping block is in the guide groove, which can ensure the relative position between the driving inclined surface and the guiding inclined surface, so that the clamping tooth can always be between the guiding inclined surface and the driving surface.

[0017] Preferably, there are multiple driving surfaces, guide grooves, guide slopes and latching teeth and they are evenly distributed along the circumference.

[0018] Through the above technical solution, the pressing rod is subjected to more uniform force, the hand feeling is better when pressed, and the rotation axis rotates more smoothly when rotating.

[0019] Preferably, a limiting portion is axially arranged on the inner wall of the upper shell body, and an abutting plane which fits with the limiting portion is arranged on the outer wall of the gear sleeve.

[0020] Through the above technical solution, after the interference plane and the limiting portion interfere with each other, the gear sleeve can be effectively limited in the circumferential direction to prevent the gear sleeve from rotating circumferentially inside the upper shell.

[0021] Preferably, a sealing ring 1 is provided between the side surface of the dial and the lower shell.

[0022] Through the above technical solution, the sealing ring is arranged on the side of the dial, which can seal the gap between the dial and the lower shell to prevent water from leaking out from there. At the same time, the sealing ring is arranged there, and the axial force applied by the pressing rod when pressing will not be transmitted to the sealing ring, so as to prevent the sealing ring from being damaged due to the axial pressing force during use.

[0023] Preferably, a slot is provided at the lower end of the inner wall of the upper shell, and a polygonal prism segment is provided on the outer side surface of the lower shell, and the sharp corner of the polygonal prism segment is stuck in the slot.

[0024] Through the above technical solution, the arrangement of the card slot and the polygonal prism segment enables the lower shell to be more conveniently positioned in the circumferential direction with the upper shell.

[0025] Preferably, the upper shell and / or the lower shell is made of metal material.

[0026] Through the above technical solution, the upper shell and the lower shell are made of metal material, the overall structural strength is higher, the service life is longer, and the tightening torque that can be withstood during installation is larger, so that a better sealing effect can be obtained for the sealing ring pressed at the lower end of the lower shell.

[0027] Compared with the prior art, the beneficial effects of the present invention are as follows: by setting the guiding inclined surface and the driving surface, the pressing rod can slide downward in the guiding groove while driving the rotating shaft to rotate through the driving surface, so that the movable valve plate rotates rapidly in the forward direction, changing the initial water outlet state of the valve core. When the pressing rod is released, the rotating shaft slides along the guiding inclined surface under the action of the spring, so that it rotates in the reverse direction while moving rapidly upward, so that the movable valve plate rotates in the reverse direction, and the valve core automatically restores the initial switch state. During use, it only takes one press of the pressing rod to switch the switch state once, which is easy to operate. At the same time, the water flow is controlled by the valve plate, and a better sealing effect can be obtained. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 is a cross-sectional schematic diagram of an embodiment;

[0029] Figure 2 An exploded view of an embodiment;

[0030] Figure 3 A three-dimensional diagram of a gear sleeve in an embodiment;

[0031] Figure 4 is a three-dimensional diagram of a pressing rod in an embodiment;

[0032] Figure 5 is a three-dimensional diagram of the rotating shaft in the embodiment;

[0033] Figure 6 is the three-dimensional representation of the rotation axis in the embodiment Figure 2 ;

[0034] Figure 7 is a three-dimensional cross-sectional view of the upper housing in the embodiment;

[0035] Figure 8 is a three-dimensional diagram of the lower housing in the embodiment;

[0036] Fig. 9 is a three-dimensional diagram of a dial in the embodiment;

[0037] Fig.10 An exploded view of the movable valve plate and the fixed valve plate in the embodiment;

[0038] Fig.11 Schematic diagram of the positions of the movable valve plate and the fixed valve plate when the valve core is in a closed state in the embodiment;

[0039] Fig.12 Schematic diagram of the positions of the movable valve plate and the fixed valve plate when the valve core is in an open state in the embodiment.

[0040] : 1. upper shell; 2. lower shell; 3. pressing rod; 4. rotating shaft; 5. spring; 6. fixed valve plate; 7. moving valve plate; 8. dial; 9. guide groove; 10. guide inclined plane; 11. latch tooth; 12. driving surface; 13. clamping block; 14. sliding inclined plane 1; 15. sliding inclined plane 2; 16. gear sleeve; 17. limiting part; 18. interference plane; 19. sealing ring 1; 20. latching groove; 21. polygonal prism section; 22. sealing ring 2; 23. plug hole; 24. plug rod; 25. clamping claw; 26. groove; 27. protrusion; 28. water inlet hole; 29. ​​flow hole; 30. water outlet; 31. water inlet; 32. base. DETAILED DESCRIPTION

[0041] The present invention is further described in detail below in conjunction with the accompanying drawings.

[0042] This specific embodiment is merely an explanation of the present invention and is not a limitation of the present invention. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed. However, as long as they are within the scope of the claims of the present invention, they are protected by the patent law.

[0043] like Figure 1 and Figure 2 As shown, an automatic reset push valve core includes an upper shell 1 and a lower shell 2, and a push rod 3, a rotating shaft 4, a gear sleeve 16 and a spring 5 are installed in the upper shell 1. The push rod 3 is inserted into the gear sleeve 16 from bottom to top, and the upper end of the push rod 3 protrudes from the gear sleeve 16 and the upper shell 1, and the rotating shaft 4 is inserted in the push rod 3. The upper end of the spring 5 is in conflict with the rotating shaft 4, and the lower end of the spring 5 is in conflict with the lower shell 2. A fixed valve plate 6, a movable valve plate 7 and a dial 8 are installed in the lower shell 2, and the upper end of the dial 8 is circumferentially fixed to the lower end of the rotating shaft 4, so that the rotating shaft 4 can drive the dial 8 to rotate when it rotates, and the dial 8 will not hinder the upward and downward sliding of the rotating shaft 4. The lower end of the dial 8 is engaged with the movable valve plate 7 through the claw 25, so that the movable valve plate 7 can rotate with the rotation of the dial 8.

[0044] The gear sleeve 16 is installed in the upper housing 1 and engages with the upper housing 1 in the circumferential direction, so that the gear sleeve 16 will not rotate in the upper housing 1 after installation. Figure 3As shown, the gear sleeve 16 is roughly annular, and a plurality of guide grooves 9 are opened on the inner wall of the gear sleeve 16 along the axial direction. The guide grooves 9 are evenly distributed along the circumference of the inner wall of the gear sleeve 16. A guide slope 10 is provided on one side of the guide groove 9. The guide slope 10 is located at the lower part of the guide groove 9. The guide slope 10 is inclined around the inner wall of the gear sleeve 16 and is spiral. The pressing rod 3 is also circular, and a driving surface 12 is provided on the bottom surface of the pressing rod 3. The driving surface 12 is also inclined and is opposite to the inclination direction of the guide slope 10. Figure 3 and Figure 4 As shown, the upper end of the guide slope 10 is inclined to the right, while the upper end of the driving surface 12 is inclined to the left, so that the guiding slope 10 and the driving surface 12 are inclined in opposite directions. The driving surface 12 is located on the inner side of the guiding slope 10, and the driving slope and the guiding slope 10 overlap in the longitudinal direction. A latching tooth 11 is provided on the rotating shaft 4, and the upper end of the latching tooth 11 is located between the guiding slope 10 and the driving surface 12, so as to ensure that the driving surface 12 can collide with the latching tooth 11 when the pressing rod 3 is pressed. A latching block 13 is also provided on the outer side of the pressing rod 3, and the latching block 13 is engaged in the guide groove 9, so as to determine the circumferential position of the pressing rod 3, and prevent the pressing rod 3 from rotating circumferentially in the gear sleeve 16, so that the driving surface 12 cannot collide with the latching tooth 11.

[0045] When the pressing rod 3 is pressed, the driving surface 12 at the lower end of the pressing rod 3 contacts the upper end of the latching tooth 11 on the rotating shaft 4, driving the rotating shaft 4 to move downward against the elastic force of the spring 5. The latching tooth 11 slides downward along the guide inclined surface 10 under the action of the driving surface 12 and the spring 5. Since the guide inclined surface 10 is spirally arranged on the inner wall of the gear sleeve 16, the latching tooth 11 rotates in the process of sliding downward along the guide inclined surface 10. When the rotating shaft 4 rotates, the movable valve plate 7 is driven to rotate through the dial 8, thereby changing the initial switch state of the valve core. When the pressing rod 3 is released, the rotating shaft 4 slides upward along the guide inclined surface 10 under the action of the spring 5. In this process, the rotating shaft 4 rotates in the opposite direction, thereby causing the movable valve plate 7 to rotate in the opposite direction, so that the valve core returns to the initial switch state.

[0046] like Figure 5 As shown, the upper end of the latch 11 is provided with a first sliding slope 14 and a second sliding slope 15, the first sliding slope 14 is fitted and slid with the driving surface 12, and the second sliding slope 15 is fitted and slid with the guiding slope 10. The provision of the first sliding slope 14 and the second sliding slope 15 can increase the contact area between the latch 11 and the driving surface 12 and the guiding slope 10, so that the latch 11 slides more smoothly and reduces the wear caused by the top of the latch 11 sliding with the driving surface 12 and the guiding slope 10.

[0047] The number of the latch teeth 11, the driving surface 12, and the guiding inclined surface 10 is the same, which is three, and they are evenly distributed along the circumference of the inner wall of the gear sleeve 16. The arrangement of the latch teeth 11, the driving surface 12, and the guiding inclined surface 10 can make the pressing rod 3 more evenly pressed when pressing the pressing rod 3, and the control feel is better. At the same time, it is not easy to get stuck during use. The number of the latch teeth 11, the driving surface 12, and the guiding inclined surface 10 is not necessarily three, and the number of the latch teeth 11, the driving surface 12, and the guiding inclined surface 10 can be reasonably set according to actual needs, such as 2, 4, 5, etc.

[0048] like Figure 3 and Figure 7 As shown, a contact plane 18 is provided on the outer surface of the gear sleeve 16, and the contact plane 18 is provided along the axial direction of the gear sleeve 16. A limiting portion 17 is provided on the inner wall of the upper shell 1, and the limiting portion 17 protrudes from the inner wall of the upper shell 1. The limiting portion 17 is provided along the axial direction of the upper shell 1. After the gear sleeve 16 is installed on the upper shell 1, the limiting portion 17 and the contact plane 18 are parallel and fit, so that the gear sleeve 16 is circumferentially limited and cannot rotate inside the upper shell 1. In addition, the gear sleeve 16 and the upper shell 1 can also be circumferentially fixed by using limiting pins, limiting blocks, and threaded connections. The gear sleeve 16 and the upper shell 1 are separately provided, which can facilitate the processing of the upper shell 1. Correspondingly, the guide groove 9 and the guide slope 10 can also be directly opened on the inner wall of the upper shell 1 by injection molding, die casting, etc.

[0049] The upper shell 1 and the lower shell 2 are made of copper (or can be made of metal materials such as stainless steel and aluminum). The use of metal materials can obtain better structural strength. A card slot 20 is provided at the lower end of the inner wall of the upper shell 1, and a polygonal prism segment 21 is provided on the lower shell 2. The cross-section of the polygonal prism segment 21 is hexagonal. There are six card slots 20, which are evenly distributed along the circumference in the upper shell 1. The upper end of the lower shell 2 is inserted into the lower end of the upper shell 1, and the sharp corners of the polygonal prism segment 21 are engaged in the card slot 20 at the lower end of the upper shell 1, so that the upper shell 1 and the lower shell 2 will not rotate in the circumferential direction. A sealing groove is provided on the outer side of the lower shell 2, and a sealing ring 22 is installed in the sealing groove. The upper shell 1 and the lower shell 2 will be sealed by the sealing ring 22. A sealing ring groove is also provided on the side of the dial 8, and a sealing ring 19 is installed in the sealing ring groove.

[0050] The lower end of the lower shell 2 is a water inlet 31, and a base 32 is installed on the water inlet 31. The base 32 and the fixed valve plate 6 are sealed by a sealing ring, and a sealing ring is also installed at the lower end of the base. When in use, the valve core is fixed in the faucet valve core cavity by an external thread arranged on the outer side of the upper shell 1, and the base 32 is pressed tightly in the valve core cavity. The sealing ring at the lower end of the base contacts and seals with the bottom surface of the valve core cavity. The fixed valve plate 6 is provided with a water inlet through hole 28, and the moving valve plate 7 is provided with a flow channel 29. The number of the water inlet through holes 28 and the flow channels 29 is the same, both four, and they correspond one to one. A water outlet 30 is arranged on the side of the lower shell 2, and the water outlet 30 is located on the side of the moving valve plate 7. After water flows out of the flow hole 29, it can flow out from the water outlet 30 on the side of the lower shell 2. The upper end of the dial 8 is provided with a plug rod 24, and the lower end of the rotating shaft 4 is provided with a plug hole 23. The cross-sections of the plug rod 24 and the plug hole 23 are in the shape of a runway, with arcs at both ends and straight lines in the middle that are parallel to each other. During installation, the plug rod 24 at the upper end of the dial 8 is inserted into the plug hole 23 at the lower end of the rotating shaft 4, thereby achieving circumferential fixation of the two. At the same time, the depth of the plug hole 23 is greater than the length of the plug rod 24, so that the rotating shaft 4 can be sleeved on the outer side of the plug rod 24 and slide axially. Two claws 25 are provided at the lower end of the dial 8, and a groove 26 is provided at the upper edge of the movable valve plate 7. The claws 25 are clamped in the groove 26, thereby achieving the common rotation of the two. A protrusion 27 is provided on the side of the fixed valve plate 6, and the fixed valve plate 6 is circumferentially fixed to the lower shell 2 through the protrusion 27.

[0051] When the water inlet through hole 28 and the flow channel 29 overlap, the valve core is in an open state, and when the water inlet through hole 28 and the flow channel 29 are completely staggered, the valve core is in a closed state. When the valve core is in the initial state, the water inlet through hole 28 and the flow channel 29 are in a state of complete overlap. When the pressing rod 3 is pressed, the rotating shaft 4 and the movable valve plate 7 are rotated 45 degrees, and the on-off state of the valve core changes from a connected state to a closed state. Then release the pressing rod 3, the rotating shaft 4 rotates 45 degrees in the opposite direction under the action of the spring 5, so that the movable valve plate 7 also rotates in the opposite direction, and the valve core returns to the initial state. At this time, the valve core is in a connected state. When in use, the valve core is installed in the flushing valve, and the flushing valve is connected to the faucet through a pipeline. When the faucet is turned on, the flushing valve discharges water. When the flushing valve needs to be closed temporarily, just press the pressing rod to keep it in a closed state, and the flushing valve stops discharging water. When water needs to be discharged again, just release the pressing rod 3.

[0052] Correspondingly, the initial state of the valve core can also be set to the water-off state, as long as the flow hole 29 on the movable valve plate 7 and the water inlet hole 28 on the fixed valve plate 6 are completely staggered at the beginning. In actual production, the relative positions of the plug rod 24 and the claw 25 on the dial 8 can be changed to rotate the plug rod 24 90 degrees or the claw 25 90 degrees.

[0053] The above description is merely an exemplary embodiment of the present invention and is not intended to limit the protection scope of the present invention. The protection scope of the present invention is determined by the appended claims.

Claims

1. An automatic reset pressing valve core, comprising an upper shell (1) and a lower shell (2), wherein a pressing rod (3), a rotating shaft (4), and a spring (5) are installed in the upper shell (1), and a fixed valve plate (6) and a movable valve plate (7) are installed in the lower shell (2), and a dial (8) is provided between the movable valve plate (7) and the rotating shaft (4), wherein: A gear sleeve (16) is separately provided in the upper shell (1), the gear sleeve (16) and the upper shell (1) are circumferentially engaged, a guide groove (9) is provided on the gear sleeve (16), a guide inclined surface (10) is provided on one side of the guide groove (9), a latching tooth (11) is provided on the rotating shaft (4), the latching tooth (11) is slidably fitted in the guide groove (9), a driving surface (12) is provided at the bottom of the pressing rod (3), the driving surface (12) is inclined, and the inclination directions of the driving surface (12) and the guiding inclined surface (10) are opposite; The rotating shaft (4) is inserted into the pressing rod (3), the upper end of the spring (5) contacts the rotating shaft (4), the lower end of the spring (5) contacts the lower housing (2), and the lower end of the dial (8) is engaged with the movable valve plate (7) through a claw (25), so that the movable valve plate (7) can rotate with the rotation of the dial (8); the fixed valve plate (6) is provided with a water inlet through hole (28), and the movable valve plate (7) is provided with a flow channel (29), and the water inlet through hole (28) and the flow channel (29) are the same in number, that is, four, and correspond one to one; A first sliding slope (14) and a second sliding slope (15) are provided at the top of the latching tooth (11); the first sliding slope (14) is in sliding cooperation with the driving surface (12); and the second sliding slope (15) is in sliding cooperation with the guiding slope (10).

2. The automatic reset pressing valve core according to claim 1, characterized in that: The guide groove (9) is arranged axially.

3. The automatic reset pressing valve core according to claim 2, characterized in that: A clamping block (13) is arranged on the side of the pressing rod (3), the guiding inclined surface (10) is arranged at the lower part of the guiding groove (9), and the clamping block (13) is slidably matched at the upper part of the guiding groove (9).

4. The automatic reset pressing valve core according to claim 2, characterized in that: The number of the driving surface (12), the guide groove (9), the guide inclined surface (10) and the latching teeth (11) is multiple and evenly distributed along the circumference.

5. The automatic reset pressing valve core according to claim 1, characterized in that: A limiting portion (17) is axially arranged on the inner wall of the upper shell (1), and an abutting plane (18) that fits the limiting portion (17) is arranged on the outer wall of the gear sleeve (16).

6. The automatic reset pressing valve core according to claim 1, characterized in that: A sealing ring (19) is provided between the side surface of the dial (8) and the lower housing (2).

7. The automatic reset pressing valve core according to claim 1, characterized in that: A slot (20) is provided at the lower end of the inner wall of the upper shell (1), and a polygonal prism section (21) is provided on the outer side surface of the lower shell (2), wherein the sharp corner of the polygonal prism section (21) is clamped in the slot (20).

8. The automatic reset pressing valve core according to claim 1, characterized in that: The upper shell (1) and / or the lower shell (2) are made of metal material.

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