Homing mechanism, valve device and gas stove

Abstract

The utility model relates to the technical field of valves, in particular to a return mechanism, a valve device and a gas stove. The return mechanism comprises a valve rod, a driving module and a timing module, wherein the valve rod has a first state and a second state; the driving module comprises an elastic part and a main transmission part, the elastic part is used for applying elastic force to the main transmission part moving in the first direction, and the main transmission part is configured to drive the valve rod to be switched from the second state to the first state in the process of moving in the first direction; and the timing module is used for regularly stopping or releasing the movement of the main transmission part along the first direction. In the using process of the returning mechanism, the valve rod can be automatically reset in a timing mode under driving of the driving module. When the valve rod is reset, the ventilation opening of the valve device is closed at the same time, so that the valve device has an automatic timing closing function, a user does not need to manually close the valve, potential safety hazards caused by forgetting to close the valve are avoided, and the use experience feeling of the user is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, in particular to a return mechanism, a valve device and a gas stove. Background Art

[0002] Most existing gas stoves do not have the function of automatically shutting off the gas at a fixed time. Generally, someone needs to be on duty to shut down the gas stove in time, otherwise it is easy to burn the food, or even pose a great safety hazard. If the user forgets to turn off the gas and leaves, it is too late when he finds out. In the worst case, the food and kitchenware will be burned, and in the worst case, a fire will be caused, or even casualties will occur.

[0003] In response to the above problems, some gas stoves are equipped with valve devices that can automatically close at a certain time, but the existing devices usually use electronic timing technology, that is, when the timing time is reached, the controller controls the valve to close the gas stove. This electronic control valve closing method is extremely unstable, and it is possible that the valve cannot be closed after the timing ends, which still poses a safety hazard. Utility Model Content

[0004] The first purpose of the utility model is to provide a return mechanism to solve the technical problem in the prior art that the valve device cannot be automatically closed at a fixed time, resulting in burning of food and kitchen utensils, and even causing fire.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A homing mechanism, comprising:

[0007] The valve stem has a first state and a second state;

[0008] A driving module, comprising an elastic member and a main transmission member, wherein: the elastic member is used to apply elastic force to the main transmission member to move along a first direction; the main transmission member is configured to drive the valve stem to switch from the second state to the first state during the movement along the first direction;

[0009] The timing module is used for timingly blocking or releasing the movement of the main transmission member along the first direction.

[0010] Furthermore, the driving module includes an elastic member and a main transmission member, wherein:

[0011] The elastic member is used to apply elastic force to the main transmission member to move along the first direction;

[0012] The main transmission member is configured to drive the valve stem to rotate around the axis of the valve stem during movement along the first direction, so that the valve stem switches from the second state to the first state.

[0013] Furthermore, the driving module further comprises a passive transmission member, and the passive transmission member is fixedly mounted on the valve stem;

[0014] The main transmission member is provided with a first linkage structure, and the passive transmission member is provided with a second linkage structure. The first linkage structure and the second linkage structure can abut against each other and cooperate with each other.

[0015] Further, the first direction is parallel to the axis of the valve stem, and the valve stem switches between the first state and the second state by rotating around its own axis;

[0016] The first linkage structure and / or the second linkage structure spirally extends around the axis of the valve stem.

[0017] Furthermore, the first linkage structure is convexly disposed on a surface of the main transmission member close to the passive transmission member;

[0018] The second linkage structure is recessed on a surface of the passive transmission component close to the main transmission component.

[0019] Furthermore, the timing module is sleeved on the valve body;

[0020] And / or, the main transmission member is sleeved on the valve body;

[0021] And / or, the passive transmission member is sleeved on the valve body;

[0022] And / or, the elastic member is a compression spring or a spring washer, and the elastic member is sleeved on the valve body.

[0023] Furthermore, the elastic member, the main transmission member, the passive transmission member and the timing module are sequentially sleeved on the valve stem along the first direction.

[0024] Furthermore, the timing module includes a limiting structure and a driving structure for timing-controlling the extension and retraction of the limiting structure; the limiting structure abuts against the main transmission member.

[0025] Furthermore, a positioning hole for inserting the limiting structure is provided on the main transmission member.

[0026] The second object of the utility model is to provide a valve device, comprising any one of the return mechanisms described above.

[0027] The third object of the utility model is to provide a gas stove, comprising the valve device described above.

[0028] Beneficial effects of the utility model:

[0029] The reset mechanism provided by the utility model includes a valve stem, a driving module and a timing module, wherein: the valve stem has a first state and a second state; the driving module includes an elastic member and a main transmission member, the elastic member is used to apply elastic force to the main transmission member to move along the first direction, and the main transmission member is configured to drive the valve stem to switch from the second state to the first state during the movement along the first direction; the timing module is used to block or release the movement of the main transmission member along the first direction at a fixed time. During the use of the reset mechanism, within a set time period, the timing module can block the movement of the main transmission member along the first direction; when the use time exceeds the set time period, the timing module releases the movement of the main transmission member along the first direction, and the main transmission member drives the valve stem to switch from the second state to the first state during the movement, thereby resetting the valve stem.

[0030] The utility model provides a valve device and a gas stove, wherein the valve device includes a valve body and the above-mentioned return mechanism, and a vent is provided on the valve body; when the valve stem is in the first state, the valve stem controls the vent to be closed; when the valve stem is in the second state, the valve stem controls the vent to be open. The use process of the valve device is: first, drive the valve stem to the second state, and the valve stem controls the vent to be opened; then, input a set time period into the timing module, and within the set time period, the timing module can block the movement of the main transmission member along the first direction; when the use time exceeds the set time period, the timing module releases the movement of the main transmission member along the first direction, and the main transmission member drives the valve stem to switch from the second state to the first state during the movement, and at this time, the valve stem controls the vent to be closed. Due to the setting of the return mechanism, the valve device and the gas stove provided by the utility model can realize the function of automatic closing at a time, without the user manually closing the valve, thereby avoiding the safety hazard caused by forgetting to close the valve, and improving the user's use experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0032] Figure 1 This is a front view structural schematic diagram of the return mechanism provided in the first embodiment of the utility model when the valve stem is in the first state;

[0033] Figure 2 A front view structural schematic diagram of the return mechanism provided in the first embodiment of the utility model when the valve stem is in the second state;

[0034] Figure 3A cross-sectional view of the return mechanism provided in the first embodiment of the utility model when the valve stem is in the first state;

[0035] Figure 4 A cross-sectional view of the return mechanism provided in the first embodiment of the utility model when the valve stem is in the second state;

[0036] Figure 5 A schematic diagram of the three-dimensional structure of the main transmission member provided in the first embodiment of the utility model;

[0037] Figure 6 A schematic diagram of the three-dimensional structure of a passive transmission member provided in the first embodiment of the utility model;

[0038] Figure 7 A schematic diagram of a transmission structure of a main transmission member and a passive transmission member provided in the first embodiment of the utility model;

[0039] Figure 8 A schematic diagram of another transmission structure of the main transmission member and the passive transmission member provided in the first embodiment of the utility model;

[0040] Fig. 9 A schematic diagram of the three-dimensional structure of the homing mechanism provided in the first embodiment of the utility model;

[0041] Fig.10 A schematic diagram of the three-dimensional structure of the valve device (including the protective shell) provided in the second embodiment of the utility model;

[0042] Fig.11 This is a schematic diagram of the three-dimensional structure of the valve device (excluding the protective shell) provided in Example 2 of the utility model.

[0043] icon:

[0044] 1- Valve stem;

[0045] 2-driving module; 21-elastic member; 22-main transmission member; 221-first linkage structure; 222-positioning hole; 223-linkage boss; 23-passive transmission member; 231-second linkage structure; 232-linkage groove;

[0046] 3-timing module; 31-limiting structure; 32-driving structure;

[0047] 4- Protective shell;

[0048] 5-Valve body. DETAILED DESCRIPTION

[0049] The technical solution of the utility model will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0050] It should be noted that in the description of the present invention, the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0051] It should be noted that in the description of the present invention, the terms "connection" and "installation" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or connected through an intermediate medium; it can be a mechanical connection or an electrical connection. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0052] Embodiment 1

[0053] The utility model provides a homing mechanism according to the first embodiment. Figure 1 and Figure 2 , the homing mechanism comprises:

[0054] The valve stem 1 has a first state and a second state;

[0055] The driving module 2 comprises an elastic member 21 and a main transmission member 22, wherein: the elastic member 21 is used to apply elastic force to the main transmission member 22 to move along the first direction; the main transmission member 22 is configured to drive the valve stem 1 to switch from the second state to the first state during the movement along the first direction;

[0056] The timing module 3 is used for timingly blocking or releasing the movement of the main transmission member 22 along the first direction.

[0057] The use process of the return mechanism is as follows: in the initial state, the valve stem 1 is in the first state (i.e. Figure 1 First, drive the valve stem 1 to the second state (i.e. Figure 2Then, a set time period is input into the timing module 3. During the set time period, the timing module 3 can block the movement of the main transmission member 22 along the first direction. At this time, the valve stem 1 can be stably in the second state. When the use time exceeds the set time period, the timing module 3 releases the movement of the main transmission member 22 along the first direction. Then, the main transmission member 22 moves along the first direction under the elastic force of the elastic member 21, and at the same time drives the valve stem 1 to switch from the second state to the first state (i.e. Figure 1 The valve stem 1 is reset.

[0058] The above-mentioned return mechanism can be applied to the valve device, and the valve stem 1 is used to control the opening and closing of the vent on the valve device; specifically, when the valve stem 1 is in the first state, the valve stem 1 controls the vent to be closed; when the valve stem 1 is in the second state, the valve stem 1 controls the vent to be opened. Due to the adoption of the above-mentioned return mechanism, the valve device can realize the function of automatic closing at a fixed time, without the need for the user to manually close the valve, thereby avoiding the safety hazard caused by forgetting to close the valve and improving the user's experience.

[0059] Reference Figure 3 and Figure 4 , the driving module 2 further includes a passive transmission member 23, and the passive transmission member 23 is fixed on the valve stem 1;

[0060] The main transmission member 22 is provided with a first linkage structure 221 , and the passive transmission member 23 is provided with a second linkage structure 231 . The first linkage structure 221 and the second linkage structure 231 can abut against each other and cooperate with each other.

[0061] In the above structure, the passive transmission member 23 and the valve stem 1 can be fixedly connected by integral molding, fastener connection, or clamping; after the passive transmission member 23 and the valve stem 1 are connected, the two can rotate synchronously around the axis of the valve stem 1. When in use, after the timing is over, the main transmission member 22 drives the passive transmission member 23 to rotate around the axis of the valve stem 1 through the first linkage structure 221 and the second linkage structure 231, and then drives the valve stem 1 to rotate around the axis of the valve stem 1, so that the valve stem 1 is switched from the second state to the first state, that is, the valve stem 1 is reset.

[0062] Continue to refer to Figure 4 , Optionally, the timing module 3 is sleeved on the valve stem 1;

[0063] And / or, the main transmission member 22 is sleeved on the valve stem 1;

[0064] And / or, the passive transmission member 23 is sleeved on the valve stem 1;

[0065] And / or, the elastic member 21 is a compression spring or a spring washer, and the elastic member 21 is sleeved on the valve stem 1 .

[0066] In this embodiment, the elastic member 21, the main transmission member 22, the passive transmission member 23 and the timing module 3 are sequentially sleeved on the valve stem 1 along the first direction. In the above structure, the elastic member 21, the main transmission member 22, the passive transmission member 23 and the timing module 3 can be limited by the valve stem 1, and this set structure can improve the compactness of the mechanism, minimize the occupied space of the entire mechanism, and improve the user experience.

[0067] In this embodiment, the elastic member 21 is specifically a compression spring, and the two ends of the compression spring are respectively abutted against a fixed structure and the main transmission member 22. When applied in a valve device, the fixed structure is specifically a valve body 5 in the valve device.

[0068] It should be noted that the elastic member 21 can also be in the form of a tension spring, etc., which only needs to satisfy the condition of applying an elastic force to the main transmission member 22 moving along the first direction. The present application does not limit the specific form of the elastic member 21.

[0069] Continue to refer to Figure 3 and Figure 4 The timing module 3 includes a limiting structure 31 and a driving structure 32 for timing control of the extension and retraction of the limiting structure 31; the limiting structure 31 abuts against the main transmission member 22. The operating principle of the timing module 3 is: in the initial state, refer to Figure 3 , the limiting structure 31 is retracted, and the valve stem 1 is in the first state; when the timed return function is required, refer to Figure 4 , driving the valve stem 1 to switch from the first state to the second state, controlling the limit structure 31 to extend, and inputting a set time period into the timing module 3. During this time period, since the limit structure 31 abuts against the main transmission member 22, the limit structure 31 can prevent the main transmission member 22 from moving upward (i.e., in the first direction); after the timing of the timing module 3 ends, the driving structure 32 controls the limit structure 31 to retract. While the limit structure 31 retracts, the main transmission member 22 moves upward under the push of the elastic member 21, thereby driving the valve stem 1 to rotate around its own axis and reset.

[0070] In this embodiment, the timing module 3 is a timer, which can be a spring-type timer. For example, a rotating disk connected to a spring is provided inside the timer, and a groove is provided on the surface of the rotating disk; during the timing of the timer, the limiting structure 31 abuts against the surface of the rotating disk, and the limiting structure 31 extends; after the timing is over, the limiting structure 31 is inserted into the groove on the surface of the disk, and the limiting structure 31 retracts. The timer is a prior art and will not be described in detail here.

[0071] Reference Figure 4 and Figure 5The main transmission member 22 is provided with a positioning hole 222 for inserting the limiting structure 31. In this embodiment, the limiting structure 31 is in the shape of a column, one end of which extends into the interior of the driving structure 32, and the other end is inserted into the positioning hole 222; the main transmission member 22 and the timing module 3 can be radially limited by the plug-in connection mode, so that the main transmission member 22 can only move along the axial direction of the valve stem 1.

[0072] On the basis of the above structure, there are two limiting structures 31 , which are respectively arranged on opposite sides of the valve stem 1 . Correspondingly, there are two positioning holes 222 . The limiting structures 31 correspond to the positioning holes 222 one by one, and the limiting structures 31 are inserted into the corresponding positioning holes 222 .

[0073] Reference Figure 5 and Figure 6 In this embodiment, the first direction is parallel to the axis of the valve stem 1, and the valve stem 1 switches between the first state and the second state by rotating around its own axis; the first linkage structure 221 and / or the second linkage structure 231 spirally extends around the axis of the valve stem 1. In this embodiment, the first direction is parallel to the axis of the valve stem 1 and points from the main transmission member 22 to the passive transmission member 23.

[0074] Specifically, the first linkage structure 221 is a helical surface, and the helical surface extends helically around the axis of the valve stem 1 ; and / or the second linkage structure 231 is a helical surface, and the helical surface extends helically around the axis of the valve stem 1 .

[0075] The following are several specific embodiments of the first linkage structure 221 and the second linkage structure 231:

[0076] The first embodiment, referring to Figure 7 The first linkage structure 221 is a spiral surface, and the spiral surface extends spirally around the axis of the valve stem 1. The second linkage structure 231 is a convex block, and the second linkage structure 231 abuts against the first linkage structure 221. When the main transmission member 22 moves upward (i.e., in the first direction), the first linkage structure 221 pushes the second linkage structure 231 upward; since the axial displacement of the valve stem 1 is limited, the second linkage structure 231 rotates along the spiral surface around the axis of the valve stem 1 under the thrust of the first linkage structure 221, thereby driving the valve stem 1 to rotate synchronously, so that the valve stem 1 switches from the second state to the first state.

[0077] In the second embodiment, the second linkage structure 231 is a helical surface that spirally extends around the axis of the valve stem 1, and the first linkage structure 221 is a convex block that abuts against the second linkage structure 231. The working principle of this structure is the same as that of the first embodiment and will not be described again.

[0078] The third embodiment, referring to Figure 8 , the first linkage structure 221 and the second linkage structure 231 are both spiral surfaces, and both extend spirally around the axis of the valve stem 1. When the valve stem 1 is in the second state, the high end of the first linkage structure 221 abuts against the low end of the second linkage structure 231; when the main transmission member 22 moves upward (i.e., in the first direction), the first linkage structure 221 pushes the second linkage structure 231 upward; the second linkage structure 231 rotates around the axis of the valve stem 1 under the thrust of the first linkage structure 221, thereby driving the valve stem 1 to rotate synchronously, so that the valve stem 1 switches from the second state to the first state; at this time, the high end of the first linkage structure 221 abuts against the high end of the second linkage structure 231, and the low end of the first linkage structure 221 abuts against the low end of the second linkage structure 231.

[0079] Continue to refer to Figure 8 In this embodiment, the first linkage structure 221 is convexly disposed on a surface of the main transmission member 22 close to the passive transmission member 23;

[0080] The second linkage structure 231 is recessed on a surface of the passive transmission member 23 close to the main transmission member 22 .

[0081] Specifically, Figure 8 In the illustrated embodiment, a linkage groove 232 is provided on the side of the passive transmission member 23 close to the main transmission member 22, and the second linkage structure 231 is the groove bottom surface of the linkage groove 232; the groove bottom surface of the linkage groove 232 extends spirally around the axis of the valve stem 1. A linkage boss 223 is provided on the side of the main transmission member 22 close to the passive transmission member 23, and the first linkage structure 221 is the top surface of the linkage boss 223, and the top surface of the linkage boss 223 extends spirally around the axis of the valve stem 1; at least part of the linkage boss 223 is inserted into the linkage groove 232. In this embodiment, the main transmission member 22 and the passive transmission member 23 are limited by a plug-in connection method, so that the two can maintain a state of abutment and linkage.

[0082] Reference Fig. 9 The return mechanism also includes a protective shell 4; the valve stem 1 is rotatably connected to the protective shell 4, part of the valve stem 1 is arranged in the protective shell 4, and one end of the valve stem 1 extends out of the protective shell 4 for user's rotation operation; the drive module 2 is arranged in the protective shell 4; the drive structure 32 of the timing module 3 is fixed on the protective shell 4, and the limiting structure 31 of the timing module 3 extends into the protective shell 4 and abuts against the main transmission member 22. A knob can be installed on the end of the valve stem 1 extending from the protective shell 4 to facilitate the user to perform a rotation operation.

[0083] The return mechanism provided in the present application has the advantages of safe and reliable use, compact structure, and small and beautiful appearance. It meets the user's needs for the use of timed closing valve devices and gas stoves. At the same time, the required installation space is small, which improves the user's experience.

[0084] Embodiment 2

[0085] The second embodiment of the utility model provides a valve device, referring to Fig.10 and Fig.11 The valve device includes a valve body 5 and the return mechanism described in any of the above embodiments; a vent is provided on the valve body 5; when the valve stem 1 is in a first state, the valve stem 1 controls the vent to be closed; when the valve stem 1 is in a second state, the valve stem 1 controls the vent to be opened.

[0086] In this embodiment, the protective shell 4 is installed on the valve body 5; one end of the valve stem 1 extends into the valve body 5 and is connected to the valve ball. When the valve stem 1 rotates, it can drive the valve ball to rotate, thereby controlling the opening and closing of the vent; the other end of the valve stem 1 passes through the drive module 2 and the timing module 3 in sequence and passes out of the protective shell 4 for the user's rotation operation.

[0087] The use process of the valve device is as follows:

[0088] Reference Figure 3 In the initial state, the valve stem 1 is in the first state, at which the vent is closed;

[0089] Then, the valve stem 1 is rotated clockwise to drive the valve stem 1 to rotate from the first state to the second state (i.e. Figure 4 As the valve stem 1 rotates, the main transmission member 22 moves downward under the linkage of the first linkage structure 221 and the second linkage structure 231, and the elastic member 21 is further compressed;

[0090] The driving structure 32 is controlled to drive the limiting structure 31 to extend, and the main transmission member 22 cannot move upward under the obstruction of the limiting structure 31; a set time period is input to the timing module 3, and during this time period, the limiting structure 31 always blocks the movement of the main transmission member 22;

[0091] Reference Figure 4 When the timing module 3 ends, the driving structure 32 drives the limiting structure 31 to retract. Since the main transmission member 22 is not blocked, the main transmission member 22 moves upward under the elastic force of the elastic member 21. At the same time, the main transmission member 22 drives the passive transmission member 23 and the valve stem 1 to rotate counterclockwise, and the valve stem 1 rotates from the second state to the first state (i.e. Figure 3 The vent is closed at this time.

[0092] Due to the setting of the return mechanism, the valve device provided by the utility model can realize the function of automatic closing at a fixed time, without the need for the user to manually close the valve, thereby avoiding the safety hazard caused by forgetting to close the valve and improving the user's usage experience.

[0093] Embodiment 3

[0094] The third embodiment of the present invention provides a gas stove, which includes the valve device described in the above embodiment. The gas stove has at least all the technical effects of the above valve device, which will not be described in detail here.

[0095] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

Claims

1. A homing mechanism, characterized in that: include: A valve stem (1) having a first state and a second state; A driving module (2), comprising an elastic member (21) and a main transmission member (22), wherein: the elastic member (21) is used to apply an elastic force to the main transmission member (22) to move along a first direction; and the main transmission member (22) is configured to drive the valve stem (1) to switch from the second state to the first state during the process of moving along the first direction; A timing module (3) is used for timingly blocking or releasing the movement of the main transmission member (22) along the first direction.

2. The homing mechanism according to claim 1, characterized in that: The driving module (2) further comprises a passive transmission component (23), wherein the passive transmission component (23) is fixedly mounted on the valve stem (1); The main transmission member (22) is provided with a first linkage structure (221), and the passive transmission member (23) is provided with a second linkage structure (231); the first linkage structure (221) and the second linkage structure (231) can abut against each other and cooperate with each other.

3. The homing mechanism according to claim 2, characterized in that: The first direction is parallel to the axis of the valve stem (1), and the valve stem (1) switches between the first state and the second state by rotating around its own axis; The first linkage structure (221) and / or the second linkage structure (231) spirally extends around the axis of the valve stem (1).

4. The homing mechanism according to claim 2, characterized in that: The first linkage structure (221) is protrudingly arranged on a surface of the main transmission member (22) close to the passive transmission member (23); The second linkage structure (231) is recessed on a surface of the passive transmission component (23) close to the main transmission component (22).

5. The homing mechanism according to claim 2, characterized in that: The timing module (3) is sleeved on the valve stem (1); And / or, the main transmission member (22) is sleeved on the valve stem (1); And / or, the passive transmission member (23) is sleeved on the valve stem (1); And / or, the elastic member (21) is a compression spring or a spring washer, and the elastic member (21) is sleeved on the valve stem (1).

6. The homing mechanism according to claim 5, characterized in that: The elastic member (21), the main transmission member (22), the passive transmission member (23) and the timing module (3) are sequentially sleeved on the valve stem (1) along the first direction.

7. The homing mechanism according to claim 2, characterized in that: The timing module (3) comprises a limiting structure (31) and a driving structure (32) for timing control of the extension and retraction of the limiting structure (31); the limiting structure (31) abuts against the main transmission member (22).

8. The homing mechanism according to claim 7, characterized in that: The main transmission member (22) is provided with a positioning hole (222) for inserting the limiting structure (31).

9. A valve device, comprising a valve body (5), wherein the valve body (5) is provided with a vent, characterized in that: Also includes a homing mechanism as claimed in any one of claims 1 to 8; When the valve stem (1) is in the first state, the valve stem (1) controls the vent to be closed; when the valve stem (1) is in the second state, the valve stem (1) controls the vent to be opened.

10. A gas stove, characterized in that: Comprising a valve device as claimed in claim 9.

Images