Patent Description:
The present application relates to the field of gas appliances, in particular to a plug valve and a gas stove.

In the current gas stoves, the fire is adjusted by manually rotating the rotary knob on the gas stove, thus the manual operation is needed when the fire needs to be adjusted, which is troublesome. For example, in the cooking process such as gruel cooking and soup cooking, the user is generally not likely to stay in the kitchen. Since the cooking time is long, after the user leaves the kitchen, it is easy for the user to forget the time to adjust the fire or even forget the cooking, and therefore it is easy to burn the food or the like for the fire is always large. If the user is required to be stayed in the kitchen, it wastes the user's time to process other works, and it is inconvenient for the user to use.

<CIT> relates to an electric ball valve comprising a valve body, a ball closing and opening a flow passage, a gearmotor and a manual adjustment lever. When power is supplied from the gearmotor, the electric ball valve is automatically closed and opened with the power from the gearmotor; while when the power from the gearmotor is cut off, the electric ball valve can be closed and opened manually via the manual adjustment lever.

<CIT> discloses a manual-automatic integrated valve, which comprises a valve body, a valve stem and an automatic clutch transmission box, wherein the automatic clutch transmission box comprising a motor, a clutch and driving gears. The manual-automatic integrated valve can be driven by the motor and therefore can be adjusted automatically, or the motor can be detached from the manual-automatic integrated valve via the clutch and the manual-automatic integrated valve can be adjusted manually via the valve stem.

The main purpose of the present application is to provide a plug valve, which aims to increase the selectivity for users, so as to be convenient for users to use.

In order to achieve the above purpose, the gas stove provided by the invention includes:.

In some embodiments, the valve seat includes a valve body and a mounting seat, the valve rod being mounted on the valve body, and the change-over switch and the driving mechanism both being mounted on the mounting seat.

In this way, the mounting seat is added on the valve body for mounting the driving mechanism and the change-over switch, so that the structure of the valve body is simplified, which facilitates the forming of the valve body and reduces the cost of the valve body.

In some embodiments, the mounting seat is provided with a mounting hole, and the valve rod is extended to pass through the mounting hole and mounted on the valve body.

It is equivalent to making the mounting hole to be a positioning reference on the mounting seat, the positioning and mounting of the driving mechanism and the change-over switch can be facilitated, and the assembling precision of the driving mechanism and the change-over switch can be improved.

In some embodiments, a mounting convex ring is arranged on a periphery of the mounting hole, and the mounting convex ring is arranged around a periphery of the valve rod.

With such an arrangement, it is equivalent to increasing the length of the mounting hole, the deflection of the valve rod can be better limited, and the stability of the valve rod during rotation is improved.

In some embodiments, the mounting convex ring is provided with an avoidance hole, and the change-over switch is extended into the mounting convex ring via the avoidance hole to cooperate with the valve rod.

With such an arrangement, excessive reduction of the structure of the mounting convex ring can be avoided, the avoidance hole bring less influence on the structural strength of the mounting convex ring as compared with a notch does, thus the mounting convex ring keeps high structural strength.

In some embodiments, the plug valve includes an ignition switch, the installation convex ring is provided with an avoidance notch, and the ignition switch is extended into the mounting convex ring via the avoidance notch to cooperate with the valve rod.

In this way, the avoidance notch can be formed at the time of forming the mounting seat, so that the subsequent process of machining avoiding notch is avoided, and the production cost of the mounting seat is reduced.

In some embodiments, the avoidance notch and the avoidance hole are distributed on two opposite sides of the mounting convex ring.

As such, mutual interference between the ignition switch and the change-over switch on the mounting seat can be avoided, the valve rod can be prevented from interfering with the ignition switch and the change-over switch in cooperation, and the reliability of the plug valve is guaranteed.

In some embodiments, an outer circumferential ring of the valve rod is provided with a triggering groove, the ignition switch is a microswitch, and a pressing portion of the ignition switch is extended into the triggering groove, the ignition switch is triggered by an upper side wall of the triggering groove when the valve rod is pressed downwards.

As compared with the manner of providing an annular protrusion on the outer peripheral surface of the valve rod to trigger the ignition switch, this way can a radial size of the valve rod, thus reduce an occupied space of the valve rod and make the structure of the plug valve more compact.

In some embodiments, the mounting seat is provided with a first limiting groove, and the change-over switch is arranged in the first limiting groove; and/or the mounting seat is provided with a second limiting groove, and the ignition switch is arranged in the second limiting groove.

That is, when the change-over switch is installed in the first limiting groove, the first limiting groove can preliminarily limit the change-over switch, so that the number of screws used for fixing the change-over switch can be reduced, for example, the change-over switch can be stably installed on the mounting seat through a screw cooperating with the first limiting groove. When the ignition switch is installed in the second limiting groove, the second limiting groove can preliminarily limit the ignition switch, so that the number of screws used for fixing the ignition switch can be reduced, for example, the ignition switch can be stably installed on the mounting seat through a screw cooperating with the second limiting groove.

In some embodiments, the driving mechanism includes a motor arranged on the mounting seat, a transmission gear arranged on a rotating shaft of the motor and a connecting gear arranged on the valve rod, and the transmission gear is connected with the connecting gear to drive the connecting gear.

As such, the structure is simple, the transmission is reliable, and the cost of the plug valve can be reduced.

In some embodiments, the plug valve further includes a controller and a controlling switch, wherein, the controller is electrically connected to the controlling switch and the motor, the controlling switch is mounted on the mounting seat, the controlling switch is intermittently triggered by the transmission gear when the motor drives the transmission gear to rotate, and the controller calculates a rotation angle of the valve rod according to times of the controlling switch being triggered.

When being used by the user, the controller can control the motor to drive the valve rod to rotate according to a preset program, so that the firepower of the gas stove can be automatically adjusted. When the user uses the gas stove for cooking, the operation times of operating the gas stove can be reduced and manually adjusting the firepower of the gas stove can be reduce, so that it is more convenient for the user to use the gas stove for cooking, and the convenience of the user using the gas stove is greatly improved.

In some embodiments, the transmission gear includes a gear body, a transmission tooth section and a vacant section sequentially arranged in a circumferential direction of the gear body, the gear body is connected to the rotating shaft of the motor, when the motor drives the transmission gear to rotate, the transmission tooth section is intermittently meshed with the connecting gear, and in the manual fire control mode, the vacant section faces the connecting gear.

With such an arrangement, even if the motor is stuck or the power supply is disconnected, the gas stove can still be started by manually rotating the valve rod, and the situation that the gas stove cannot be normally used due to failure or power failure of the motor is avoided.

In some embodiments, the controlling switch is a microswitch arranged on a peripheral side of the transmission gear, when the motor drives the transmission gear to rotate, the controlling switch is intermittently triggered by the transmission tooth section.

By using the transmission tooth section to trigger the controlling switch, it can avoid that an additional trigger structure is arranged on the transmission gear, thus the structure of the transmission gear can be simplified, and the assembly processes of the plug valve can be reduced.

In some embodiments, the connecting gear is located at an end of the mounting convex ring on the mounting seat away from the valve body, the mounting seat is further provided with a supporting portion along a protruding direction of the mounting convex ring, the motor is fixed to a side of the supporting portion facing the valve body, the motor is extended to pass through the supporting portion, and the transmission gear is located on a surface of the supporting portion far away from the valve body, and meshed with the connecting gear.

In this way, the transmission gear and the connecting gear are substantially in the same plane, which not only ensures that the transmission gear and the connecting gear can be better engaged, but also reduces the length of the rotating shaft of the motor, the possibility of bending and deformation of the rotating shaft of the motor during the rotating of the transmission gear is reduced, so that the rotating stability of the connecting gear is better.

In some embodiments, the plug valve further includes: a wireless communication module communicates with an external terminal to receive a control instruction from the external terminal; and a controller electrically connected to the wireless communication module and the driving mechanism, and controls the driving mechanism to drive the valve rod to rotate according to the control instruction.

As such, when the user needs to adjust the firepower of the gas stove or to turn off the gas stove in the cooking process, the user only needs to send a corresponding control instruction to the gas stove through the external terminal, so that the user does not need to enter the kitchen to operate the gas stove. The user can conveniently adjust the firepower and turn off the fire of the gas stove, and the use convenience of the user is improved.

In some embodiments, the plug valve further includes a temperature sensor detects a temperature of a cooking utensil; and a controller electrically connected to the temperature sensor and the driving mechanism, and controls the driving mechanism to drive the valve rod to rotate according to the temperature.

When the automatic ignition mode is started, the temperature of the cooking utensil can be detected in real time through the temperature sensor, so that the controller can control the driving mechanism to drive the valve rod to the target firepower gear according to the preset program and the temperature, and the precision of the automatic fire control mode of the gas stove can be improved.

The present application further provides a gas stove. The gas stove includes a stove body and the above plug valve, the plug valve is arranged on the stove body.

According to the embodiments, the driving mechanism and the change-over switch are provided on the plug valve, and the driving mechanism is connected to the valve rod to drive the valve rod, so as to rotate the valve rod through the driving mechanism, so that the automatic fire control mode of adjusting firepower through the driving mechanism rotating the valve rod is added on the basis of manual fire control mode, thus the user can manually adjust the firepower or select the mode of automatically adjusting the firepower, the selectivity for the user is improved, and the user can conveniently switch and use in multiple cooking modes.

In order to more clearly explain the embodiments of the present application or the technical solutions in the related art, the drawings used in the description of the embodiments or the related art will be briefly introduced below. Obviously, the drawings in the following description are merely some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on the structure shown in these drawings without creative work.

Description of reference numerals in the figures:.

The realization of the purposes, functional features and advantages of the present application will be further explained with reference to the accompanying drawings in combination with the embodiments.

In the following, the embodiments of the present application will be clearly and completely described with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, and not all of the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those of ordinary skilled in the art without creative efforts shall fall within the claimed scope of the present application.

It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in the embodiments of the present application are only used to explain the relative positional relationship, movement situation, etc. between components in a specific attitude (as shown in the drawings). If the specific attitude changes, the directional indication also changes accordingly.

In addition, the descriptions related to "first", "second" and the like in the present application are for descriptive purposes only, and should not be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined by "first" and "second" may explicitly or implicitly include at least one of such feature. In addition, the meaning of "and/or" in the full text includes three parallel solutions, taking "A and/or B" as an example, it includes solution A, solution B, or both solutions A and B. The various embodiments can be combined with each other, but the combination must be based on what can be achieved by those of ordinary skill in the art. When the combination of the embodiments is contradictory or cannot be achieved, it should be considered that such a combination does not exist, or is not within the scope of the claims of the present application.

The present application provides a plug valve applied in a gas stove.

In the embodiment of the present application, referring to <FIG> and <FIG>, the plug valve <NUM> includes a valve seat <NUM>, a valve rod <NUM>, a driving mechanism and a change-over switch <NUM>. The valve rod <NUM> is mounted on the valve seat <NUM>. The driving mechanism is mounted on the valve seat <NUM>. The driving mechanism is connected to the valve rod <NUM> to drive the valve rod <NUM>. The change-over switch <NUM> is mounted on the valve seat <NUM> and electrically connected to the driving mechanism. The plug valve <NUM> has an automatic fire control mode and a manual fire control mode. When the change-over switch <NUM> is triggered by rotating the valve rod <NUM>, the plug valve <NUM> is switched to the automatic fire control mode.

In the present embodiment, the plug valve <NUM> further includes a controller. The controller is electrically connected to the change-over switch <NUM> and the driving mechanism. The plug valve <NUM> has a closing gear and a preset firepower gear after rotating a preset angle. When the valve rod <NUM> rotates to the preset firepower gear, the valve rod <NUM> triggers the change-over switch <NUM>, so that the plug valve <NUM> is switched to the automatic fire control mode. In the automatic fire control mode, the driving mechanism can be controlled to drive the valve rod <NUM> to rotate to adjust the firepower.

In some embodiments, when the valve rod <NUM> rotates from the closing gear to the preset firepower gear, ignition is achieved, for example, the ignition process can be completed when the valve rod <NUM> rotates away from the closing gear. When the valve rod <NUM> is rotated to the preset firepower gear and triggers the change-over switch <NUM>, the controller can detect that the change-over switch <NUM> is triggered, switch the plug valve <NUM> to the automatic fire control mode, and then control the driving mechanism to drive the valve rod <NUM> to rotate to a target firepower gear according to a preset program, so that the function of automatically adjusting the firepower is achieved.

The valve rod <NUM> can be manually adjusted and rotated to the preset firepower gear, or a starting instruction can be sent to the controller through an external terminal, and the controller controls the driving mechanism to rotate the valve rod <NUM> to the preset firepower gear. In addition, manual operation can be applied to complete the ignition, or electric control can be applied to complete the ignition. Of course, in other embodiments, the plug valve <NUM> may not be provided with a controller.

According to the embodiments, the driving mechanism and the change-over switch <NUM> are provided on the plug valve <NUM>, and the driving mechanism is connected to the valve rod <NUM> to drive the valve rod <NUM>, so as to rotate the valve rod <NUM> through the driving mechanism, so that the automatic fire control mode of adjusting firepower through the driving mechanism rotating the valve rod <NUM> is added on the basis of manual fire control mode. thus the user can manually adjust the firepower or select the mode of automatically adjusting the firepower, the selectivity for the user is improved, and the user can conveniently switch and use in multiple cooking modes.

With reference to <FIG> and <FIG>, in an embodiment, the valve seat <NUM> includes a valve body <NUM> and a mounting seat <NUM>. The valve rod <NUM> is mounted on the valve body <NUM>. The change-over switch <NUM> and the driving mechanism are both mounted on the mounting seat <NUM>. Since the valve body <NUM> needs to be provided with a gas channel and the like, the structure of the valve body <NUM> is relatively complex, by arranging the mounting seat <NUM> on the valve body <NUM> to mount the driving mechanism and the change-over switch <NUM>, the structure of the valve body <NUM> is simplified, the valve body <NUM> is conveniently manufactured and molded, and the cost of the valve body <NUM> is reduced. The mounting seat <NUM> can be detachably connected to the valve body <NUM>, for example, the mounting seat <NUM> can be fixed to the valve body <NUM> by means of screws, or the mounting seat <NUM> can be welded to the valve body <NUM>, etc. Of course, in other embodiments, the change-over switch <NUM> and the driving mechanism can be mounted on the valve body <NUM>.

In one embodiment, the mounting seat <NUM> is provided with a mounting hole, and the valve rod <NUM> is passed through the mounting hole and mounted on the valve body <NUM> through the mounting hole. In some embodiments, the driving mechanism and the change-over switch <NUM> both need to cooperate with the valve rod <NUM>, by providing a mounting hole o the mounting seat and passing the valve rod <NUM> through the mounting hole, the mounting hole is used as a positioning reference on the mounting seat <NUM>, so that positioning and mounting of the driving mechanism and the change-over switch <NUM> can be facilitated, and the assembling precision of the driving mechanism and the change-over switch <NUM> can be improved. Of course, in other embodiments, the mounting seat <NUM> can be disposed beside the valve rod <NUM>.

In one embodiment, the mounting seat <NUM> is provided with a mounting convex ring <NUM> at a periphery of the mounting hole. The mounting convex ring <NUM> is annularly sleeved on the valve rod <NUM>. In some embodiments, the mounting convex ring <NUM> is provided on a surface of the mounting seat <NUM> facing away from the valve body <NUM>, and the valve rod <NUM> partially extends into the mounting convex ring <NUM>, so that it is equivalent to increasing a length of the mounting hole, which can better limit the deflection of the valve rod <NUM> and improve the stability of the valve rod <NUM> during rotation. Of course, in other embodiments, it is possible not to provide the mounting convex ring <NUM>.

In one embodiment, the plug valve <NUM> includes an ignition switch <NUM>. The mounting convex ring <NUM> is provided with an avoidance notch <NUM>. The ignition switch <NUM> is extended into the mounting convex ring <NUM> from the avoidance notch <NUM> to cooperate with the valve rod <NUM>. In some embodiments, the mounting convex ring <NUM> and the mounting seat <NUM> are integrally formed, and the avoiding notch <NUM> is extended and pierces through an end surface of the mounting convex ring <NUM>, so that when the mounting seat <NUM> is formed, the avoiding notch <NUM> can be formed at the same time, and the subsequent process of forming the avoidance notch <NUM> is avoided, to reduce the production cost of the mounting seat <NUM>. Of course, in other embodiments, an avoidance through hole can be provided on the mounting convex ring <NUM>, and the ignition switch <NUM> is extended into the mounting convex ring <NUM> from the avoidance through hole to cooperate with the valve rod <NUM>.

In one embodiment, the mounting convex ring <NUM> is provided with an avoidance hole <NUM>, and the change-over switch <NUM> is extended into the mounting convex ring <NUM> from the avoiding hole <NUM> to cooperate with the valve rod <NUM>. In some embodiments, the avoidance hole <NUM> is spaced from the avoidance notch <NUM>, and the avoidance hole <NUM> is spaced from the end surface of the mounting convex ring <NUM>, so that the structure of the mounting convex ring <NUM> can be prevented from being reduced, and compared with the manner of providing a notch <NUM>, the avoidance hole <NUM> has less influence on the structural strength of the mounting convex ring <NUM>, so that the mounting convex ring <NUM> maintains a higher structural strength. Of course, in other embodiments, the mounting convex ring <NUM> can be provided with the avoidance notch <NUM>, and the change-over switch <NUM> is extended into the mounting convex ring <NUM> from the avoidance notch <NUM> to cooperate with the valve rod <NUM>.

In one embodiment, the avoidance notch <NUM> and the avoidance hole <NUM> are located on two opposite sides of the mounting convex ring <NUM>. That is, the change-over switch <NUM> and the ignition switch <NUM> are arranged on the two opposite sides of the mounting convex ring <NUM>, so that mutual interference between the ignition switch <NUM> and the change-over switch <NUM> on the mounting seat <NUM> can be avoided, the valve rod <NUM> can be prevented from interfering with the ignition switch <NUM> and the change-over switch <NUM> respectively, and the reliability of the plug valve <NUM> is ensured. Of course, in other embodiments, the avoidance notch <NUM> and the avoidance hole <NUM> can be provided on the same side of the mounting convex ring <NUM>, etc..

In one embodiment, the ignition switch <NUM> is a microswitch. In some embodiments, the ignition switch <NUM> can be a normally closed microswitch or a normally open microswitch, so that the structure is simple, and the structure of the plug valve <NUM> is simplified. Of course, in other embodiments, the ignition switch <NUM> can be a photoelectric sensor or a Hall sensor, etc..

Referring to <FIG>, in an embodiment, a triggering groove <NUM> is provided around an outer peripheral surface of the valve rod <NUM>. A pressing portion of the ignition switch <NUM> is extended into the triggering groove <NUM> so that an upper side wall of the triggering groove <NUM> triggers the ignition switch <NUM> when the valve rod <NUM> is pressed downwards. Such manner can reduce a radial size of the valve rod <NUM>, thus reduce an occupied space of the valve rod <NUM> and make the structure of the plug valve <NUM> more compact, as compared with the manner of providing an annular protrusion on the outer peripheral surface of the valve rod <NUM> to trigger the ignition switch <NUM>. Of course, in other embodiments, the annular protrusion can be provided on the outer peripheral surface of the valve rod <NUM> to trigger the ignition switch <NUM>.

In one embodiment, the change-over switch <NUM> is a microswitch. In some embodiments, the change-over switch <NUM> can be a normally closed microswitch or a normally open microswitch. The valve rod <NUM> is provided with the notch <NUM>, a pressing portion of the change-over switch <NUM> abuts against the outer peripheral surface of the valve rod <NUM> when the valve rod <NUM> rotates from the closed gear to the preset firepower gear, and makes the change-over switch <NUM> be in a turn-on state. when the valve rod <NUM> is rotated to the preset firepower gear, the pressing portion of the change-over switch <NUM> is located in the notch <NUM> to make the change-over switch <NUM> switch from the turn-on state to a turn-off state. That is, when the valve rod <NUM> is rotated to the preset firepower gear, the state of the change-over switch <NUM> changes, so that a trigger signal is generated. When the controller detects the trigger signal generated by the change-over switch <NUM>, the automatic fire control mode is started. As such, the structure is simple, and the structure of the valve rod <NUM> and the structure of the plug valve <NUM> can be simplified. Certainly, in other embodiments, a convex portion can be provided on the outer peripheral surface of the valve rod <NUM>. When the valve rod <NUM> is rotated to the preset firepower gear, the change-over switch <NUM> switches from the turn-off state to the turn-on state. In addition, the change-over switch <NUM> can be a photoelectric sensor or a Hall sensor, or the like.

The fixing manners of fixing the change-over switch <NUM> are various, for example, in one embodiment, the change-over switch <NUM> is fixed to the mounting seat <NUM> by means of screws, as such the structure is simple, and the fixing is stable. In other embodiments, an engagement structure can be provided on the mounting seat <NUM>, and the change-over switch <NUM> is engaged to the mounting seat <NUM> by the engagement structure.

In one embodiment, the mounting seat <NUM> is provided with a first limiting groove <NUM>, and the change-over switch <NUM> is arranged in the first limiting groove <NUM>. In some embodiments, the first limiting groove <NUM> can limit the change-over switch <NUM> to rotate on the mounting seat <NUM>, that is, when the change-over switch <NUM> is installed in the first limiting groove <NUM>, the first limiting groove <NUM> can preliminarily limit the change-over switch <NUM>, so that the number of screws used for fixing the change-over switch <NUM> can be reduced, for example, the change-over switch <NUM> can be stably installed on the mounting seat <NUM> through one screw cooperating with the first limiting groove <NUM>. Of course, in other embodiments, the first limiting groove <NUM> can be omitted, and the change-over switch <NUM> is fixed to the mounting seat <NUM> through at least two screws.

In one embodiment, the mounting seat <NUM> is provided with a first positioning post <NUM>, and the change-over switch <NUM> is provided with a first positioning hole. When the change-over switch <NUM> is mounted on the mounting seat <NUM>, the first positioning post <NUM> is inserted in the first positioning hole, so that the change-over switch <NUM> can be positioned, and the change-over switch <NUM> can also be prevented to translate on the mounting seat <NUM>. In the embodiment where the first limiting groove <NUM> is provided, the first positioning post <NUM> can be disposed in the first limiting groove <NUM>.

The fixing manners of fixing the ignition switch <NUM> are various, for example, in one embodiment, the ignition switch <NUM> is fixed to the mounting seat <NUM> by screws, as such the structure is simple, and the fixing is stable. In other embodiments, an engagement structure can be provided on the mounting seat <NUM>, and the ignition switch <NUM> is engaged to the mounting seat <NUM> by the clamping structure.

In one embodiment, the mounting seat <NUM> is provided with a second limiting groove <NUM>, and the ignition switch <NUM> is arranged in the second limiting groove <NUM>. In some embodiments, the second limiting groove <NUM> can limit the ignition switch <NUM> to rotate on the mounting seat <NUM>, that is, when the ignition switch <NUM> is installed in the second limiting groove <NUM>, the second limiting groove <NUM> can preliminarily limit the ignition switch <NUM>, so that the number of screws used for fixing the ignition switch <NUM> can be reduced, for example, the ignition switch <NUM> can be stably installed on the mounting seat <NUM> through a screw cooperating with the second limiting groove <NUM>. Of course, in other embodiments, the second limiting groove <NUM> can be omitted, and the ignition switch <NUM> is fixed to the mounting seat <NUM> by at least two screws.

In one embodiment, the mounting seat <NUM> is provided with a second positioning post <NUM>, and the ignition switch <NUM> is provided with a second positioning hole. When the ignition switch <NUM> is mounted on the mounting seat <NUM>, the second positioning post <NUM> is inserted in the second positioning hole, so that the ignition switch <NUM> can be positioned, and the ignition switch <NUM> can also be prevented to translate on the mounting seat <NUM>. In the embodiment where the second limiting groove <NUM> is provided, the second positioning post <NUM> can be disposed in the second limiting groove <NUM>.

In one embodiment, the preset firepower gear is the minimum firepower gear. In the embodiment, when the valve rod <NUM> rotates from the closing gear to the minimum firepower gear, the valve rod <NUM> rotates anticlockwise, and the minimum firepower gear is the maximum angle of rotation of the valve rod <NUM>. Therefore, when the preset firepower gear is the minimum firepower gear, the user can conveniently determine the position of the preset firepower gear, so that the user can manually rotate the valve rod <NUM> to the preset firepower gear. In addition, when the automatic fire control mode is started, the motor <NUM> may not drive the valve rod <NUM> to rotate to the target firepower gear immediately, at this time, if the preset firepower gear is a gear with a larger firepower, the temperature of the cooking utensil can be rapidly increased, and the food in the cooking utensil is burnt. By setting the preset firepower gear to be the minimum firepower gear, the heating speed of the cooking utensil can be slowed down, and the risk that the food in the cooking utensil is burnt due to rapid temperature rise is reduced. Of course, in other embodiments, the preset firepower gear can be another firepower gear.

In one embodiment, the driving mechanism includes a motor <NUM> provided on the mounting seat <NUM>, a transmission gear <NUM> provided on a rotating shaft of the motor <NUM>, and a connecting gear <NUM> provided on the valve rod <NUM>. The transmission gear <NUM> is in transmission connection with the connecting gear <NUM>. Therefore, the structure is simple, the transmission is reliable, and the cost of the plug valve <NUM> can be reduced. Of course, in other embodiments, another transmission mode can be used.

With reference to <FIG> and <FIG>, in an embodiment, the plug valve <NUM> further includes a controlling switch <NUM>, the controller is electrically connected to the controlling switch <NUM> and the motor <NUM>, and the controlling switch <NUM> is mounted on the mounting seat <NUM>. When the motor <NUM> drives the transmission gear <NUM> to rotate, the transmission gear <NUM> intermittently triggers the controlling switch <NUM>. The controller is configured for calculating a rotation angle of the valve rod <NUM> according to the number of times the controlling switch <NUM> is triggered. In some embodiments, when the controller controls the motor <NUM> to drive the transmission gear <NUM> to rotate in a first direction, the transmission gear <NUM> triggers the controlling switch <NUM> one time, and the firepower gear of the plug valve <NUM> is increased by one gear. When the controller controls the motor <NUM> to drive the transmission gear <NUM> to rotate in a second direction, the transmission gear <NUM> triggers the controlling switch <NUM> one time, and the firepower gear of the plug valve <NUM> is reduced by one gear. The first direction is opposite to the second direction. That is, the first direction and the second direction are opposite circumferential directions, and the following description takes the first direction being the anticlockwise direction as an example, but is not limited thereto. When the first direction is the counterclockwise direction, the second direction is the clockwise direction.

In the automatic fire control mode, the controller can control the motor <NUM> to drive the transmission gear <NUM> to rotate, so that the transmission gear <NUM> drives the connecting gear <NUM> and the valve rod <NUM> to rotate. When the controller controls the motor <NUM> to drive the transmission gear <NUM> to rotate in the first direction, the transmission gear <NUM> triggers the controlling switch <NUM> once, that is, the valve rod <NUM> is rotated for a certain angle, so that the firepower gear of the plug valve <NUM> is increased by one gear. When the controller controls the motor <NUM> to drive the transmission gear <NUM> to rotate in the second direction, the transmission gear <NUM> triggers the controlling switch <NUM> once, that is, the valve rod <NUM> is rotated in the opposite direction for a certain angle, so that the firepower gear of the plug valve <NUM> is reduced by one gear. Under the driving of the motor <NUM>, the valve rod <NUM> rotates to the minimum firepower gear in the second direction, and the controller controls the motor <NUM> to stop rotating. That is, during the automatic fire control process, the valve rod <NUM> rotates between the maximum firepower gear and the minimum firepower gear. Since the transmission gear <NUM> cannot be displaced, and the controlling switch <NUM> is triggered by the rotation of the transmission gear <NUM>, the accuracy of detecting the controlling switch <NUM> can be ensured, and the accuracy of the automatic fire control mode is ensured.

Therefore, when the controller controls the motor <NUM> to drive the transmission gear <NUM> to rotate, the transmission gear <NUM> can intermittently trigger the controlling switch <NUM>, and the controller can determine the firepower gear corresponding to the rotation of the valve rod <NUM> according to the rotation direction of the motor <NUM> and the trigger times of the controlling switch <NUM>. That is, when being used by the user, the controller can control the motor <NUM> to drive the valve rod <NUM> to rotate according to a preset program, so that the firepower of the gas stove can be automatically adjusted. When the user uses the gas stove for cooking, the operation times of operating the gas stove can be reduced and manually adjusting the firepower of the gas stove can be reduce, so that it is more convenient for the user to use the gas stove for cooking, and the convenience of the user using the gas stove is greatly improved.

In addition, if the firepower is determined according to the rotating steps of the motor <NUM>, for being limited by an operation speed of a single-chip microcomputer, the single-chip microcomputer controls the generation of the stepping pulse of the step motor <NUM> by using a timer, for being limited by a time resolution of the timer, the operation speed adjustment of the step motor <NUM> is discrete, causing the torques of the speeds to be discrete, furthermore, because of the inertia and the torque, the step-out phenomenon easily occurs. and the motor <NUM> is difficult to rotate according to a preset number of steps, thus the control precision is poor, and the practicability is poor. Compared with the mode of determining the firepower according to the number of rotating steps of the motor <NUM>, the problem of poor practicability caused by the fact that the stepping motor <NUM> is easy to lose steps or cannot rotate according to the preset step number can be avoided, and meanwhile, the motor <NUM> can be a step motor <NUM> or be a direct current motor <NUM>, the limitation is small, and flexible configuration can be achieved.

According to the embodiments, electric control mechanisms such as the motor <NUM>, the connecting gear <NUM> and the transmission gear <NUM> can be added on the basis of the conventional plug valve <NUM>, no additional gas pipeline structure is needed, the difficulty of the installation process and the air leakage risk are reduced, and the original installation process and the gas path installation process of the gas stove are not affected. The gas stove of the embodiments is consistent with the commonly used gas stove with a small bottom shell, so that when a user adopts the gas stove of this solution, the installation hole of installating the gas stove does not need to be enlarged, the resistance of the customer to replace the gas stove is reduced, the sale hurdle of the gas stove is reduced, and the market competitiveness is improved.

In one embodiment, the minimum firepower gear corresponds to a position where the valve rod <NUM> is rotated anticlockwise for <NUM> degrees from the closed gear, and the maximum firepower gear of the gas stove corresponds to a position where the valve rod <NUM> is rotated anticlockwise for <NUM> degrees or <NUM> degrees from the closed gear. In this way, more firepower gears can be arranged between the minimum firepower gear and the maximum firepower gear, and the firepower adjustment precision can be improved. Of course, in other embodiments, the minimum firepower gear and the maximum firepower gear can also correspond to other positions.

With reference to <FIG>, <FIG> and <FIG>, in an embodiment, the transmission gear <NUM> includes a gear body <NUM>, and a transmission tooth section <NUM> and a vacant section <NUM> which are sequentially arranged in a circumferential direction of the gear body <NUM>, the gear body <NUM> is connected to a rotating shaft of the motor <NUM>. When in the automatic fire control mode, the motor <NUM> drives the transmission gear <NUM> to rotate, the transmission tooth section <NUM> is intermittently engaged with the connecting gear <NUM>. When in the manual fire control mode, the vacant section <NUM> faces the connecting gear <NUM>. In some embodiments, the transmission tooth section <NUM> is provided with meshing teeth <NUM>, so that in the automatic fire control mode, the meshing teeth <NUM> can meshed with the connecting gear <NUM> to drive the connecting gear <NUM> to rotate. The vacant section has no meshing teeth <NUM>. When the vacant section <NUM> faces the connecting gear <NUM>, the connecting gear <NUM> is spaced from the meshing teeth <NUM> of the transmission tooth section <NUM>, so that the transmission gear <NUM> and the connecting gear <NUM> are independent from each other. That is, in the automatic fire control mode, when the transmission gear <NUM> rotates to make the transmission tooth section <NUM> mesh with the connecting gear <NUM>, the connecting gear <NUM> can be driven to rotate, and when the transmission gear <NUM> rotates to make the vacant section <NUM> face the connecting gear <NUM>, the transmission gear <NUM> does not drive the connecting gear <NUM> to rotate.

Therefore, in the automatic fire control mode, when the transmission gear <NUM> is driven to rotate continuously by the motor <NUM>, the transmission tooth section <NUM> can intermittently mesh with the connecting gear <NUM> to drive the connecting gear <NUM> and the valve rod <NUM> to rotate, so as to electrically control the valve rod <NUM> to rotate to adjust the firepower. In addition, when the transmission gear <NUM> is driven by the motor <NUM> to rotate the vacant section <NUM> to face the connecting gear <NUM>, the motor <NUM> is controlled to stop rotating, so that the transmission gear <NUM> maintains the state of the vacant section <NUM> facing the connecting gear <NUM>. When the valve rod <NUM> is manually rotated, mutual interference between the transmission gear <NUM> and the connecting gear <NUM> can be avoided, it is ensured that the valve rod <NUM> rotates smoothly, and the situation that the torque is increased due to the fact that the transmission gear <NUM> is driven to rotate when manually rotating valve rod <NUM> is avoided. Even if the motor <NUM> is stuck or the power supply is disconnected, the gas stove can still be started by manually rotating the valve rod <NUM>, and the situation that the gas stove cannot be normally used due to failure or power failure of the motor <NUM> is avoided. That is, the plug valve <NUM> in the present solution can automatically adjust the firepower by electrically rotating the valve rod <NUM>, and can also avoid the situation that the gas stove cannot be normally used due to failure or power failure of the motor <NUM>. Of course, in other embodiments, the controlling switch <NUM> can be a photoelectric sensor or a Hall sensor. In addition, the transmission gear <NUM> may not be provided with the vacant section <NUM>.

In one embodiment, the controlling switch <NUM> is a microswitch and is arranged on the peripheral side of the transmission gear <NUM>. When the motor <NUM> drives the transmission gear <NUM> to rotate, the transmission tooth section <NUM> intermittently triggers the controlling switch <NUM>, that is, the meshing teeth <NUM> of the transmission tooth section <NUM> can trigger the controlling switch <NUM>. Therefore, it can avoid that an additional trigger structure is arranged on the transmission gear <NUM>, thus the structure of the transmission gear <NUM> can be simplified, and the assembly processes of the plug valve <NUM> can be reduced. Of course, in other embodiments, an additional trigger structure for triggering the controlling switch <NUM> can be arranged on the transmission gear <NUM>. At this time, there can be one or more trigger structures on the transmission gear <NUM>, when there are a plurality of trigger structures, the plurality of trigger structures are distributed at intervals along the circumferential direction of the transmission gear <NUM>.

Please refer to <FIG> and <FIG>, the transmission gear <NUM> has a variety of structures. For example, in one embodiment, the transmission gear <NUM> includes multiple transmission tooth sections <NUM> and multiple vacant sections <NUM>, the transmission tooth sections <NUM> and the vacant sections <NUM> are alternately distributed in the circumferential direction of the gear body <NUM>. That is, at least two transmission tooth sections <NUM> and at least two vacant sections <NUM> are provided in the transmission gear <NUM>, which is equivalent to that a plurality of transmission tooth sections <NUM> are arranged on the gear body <NUM>. The plurality of transmission tooth sections <NUM> are distributed at intervals along the circumferential direction of the gear body <NUM>, and a vacant section <NUM> is formed between two adjacent transmission tooth sections <NUM> along the circumferential direction of the gear body <NUM>. When the vacant section <NUM> faces the connecting gear <NUM>, the connecting gear <NUM> is spaced from the meshing teeth <NUM> of the transmission tooth sections <NUM>. The number of the transmission tooth sections <NUM> can be two, three, four, five or more, or the like.

By arranging a plurality of transmission tooth sections <NUM>, when the transmission gear <NUM> rotates for one circle, the connecting gear <NUM> and the valve rod <NUM> can be driven to rotate multiple times, so that the rotation angle of the valve rod <NUM> driven by the motor <NUM> driving the transmission gear <NUM> to rotate for one circle is larger, so that the rotating speed of the valve rod <NUM> is larger, and the valve rod <NUM> can be rapidly rotated to the target firepower gear. Moreover, it is equivalent to reducing the length of the vacant sections <NUM> in the circumferential direction of the gear body <NUM>, so that when it is ensured that the connecting gear <NUM> and the transmission tooth section <NUM> do not interfere with each other in the automatic fire control mode, the time occupied by the idle state of the transmission gear <NUM> (the state that the transmission tooth sections <NUM> do not mesh with the connecting gear <NUM> during the continuous rotation of the transmission gear <NUM>) is reduced. Energy waste in the idle state of the transmission gear <NUM> can be reduced, and energy can be saved. In the embodiment of triggering the controlling switch <NUM> through the transmission tooth section(s) <NUM>, when the transmission gear <NUM> rotates the same angle, a plurality of transmission tooth sections <NUM> can increase the number of triggering times of the controlling switch <NUM>, so that the firepower adjustment is more accurate. In order to ensure the accuracy of controlling the rotation of the valve rod <NUM>, in one embodiment, the plurality of transmission tooth sections <NUM> are uniformly distributed at intervals in the circumferential direction of the gear body <NUM>, and the plurality of vacant sections <NUM> are uniformly distributed at intervals in the circumferential direction of the gear body <NUM>.

In another embodiment, the transmission gear <NUM> includes one transmission tooth section <NUM> and one vacant section <NUM>, that is, the transmission tooth section <NUM> and the vacant section <NUM> are sequentially arranged in the circumferential direction of the gear body <NUM>, so that the structure of the transmission gear <NUM> is relatively simple. Arc lengths of the transmission tooth section <NUM> and the vacant section <NUM> in the circumferential direction of the gear body <NUM> can be the same or different.

In one embodiment, the transmission tooth section <NUM> is provided with a plurality of meshing teeth <NUM>, the plurality of meshing teeth <NUM> are sequentially distributed along the circumferential direction of the gear body <NUM>, and each meshing tooth <NUM> of the same transmission tooth section <NUM> is sequentially meshed with the connecting gear <NUM>. That is, each transmission tooth section <NUM> is provided with at least two meshing teeth <NUM>, when the transmission gear <NUM> rotates to make the transmission tooth section <NUM> mesh with the connecting gear <NUM>, the transmission gear <NUM> rotates the connecting gear <NUM> and the valve rod <NUM> for a larger angle, so that the rotation angle of the valve rod <NUM> driven through that the motor <NUM> drives the transmission gear <NUM> to rotate for one circle is larger, the rotating speed of the valve rod <NUM> is larger, and the valve rod <NUM> can be quickly rotated to the target firepower gear. The number of the meshing teeth <NUM> of the transmission tooth section <NUM> can be two, three, four or more, or the like.

In another embodiment, the transmission tooth section <NUM> can be provided with only one meshing tooth <NUM>, this arrangement can make the structure of the transmission gear <NUM> relatively simple.

In one embodiment, the connecting gear <NUM> and the transmission gear <NUM> are both cylindrical gears. In this embodiment, the connecting gear <NUM> and the transmission gear <NUM> are both straight spur gears, but it's not limited thereto, in other embodiments, the connecting gear <NUM> and the transmission gear <NUM> can be helical spur gears or other types of cylindrical gears. When the connecting gear <NUM> and the transmission gear <NUM> are both cylindrical gears, the structures of the connecting gear <NUM> and the transmission gear <NUM> are relatively simple, which is beneficial to reducing the assembly difficulty and the production cost.

In addition, referring to <FIG>, in another embodiment, both the connecting gear <NUM> and the transmission gear <NUM> are bevel gears. In this embodiment, the connecting gear <NUM> and the transmission gear <NUM> are both straight bevel gears. However, in other embodiments, the connecting gear <NUM> and the transmission gear <NUM> can be helical bevel gears or other types of bevel gears. When the connecting gear <NUM> and the transmission gear <NUM> are both bevel gears, the stability of operations of the transmission gear <NUM> and the connecting gear <NUM> can be ensured, and the noise can be reduced.

Refer to <FIG>, when both the connecting gear <NUM> and the transmission gear <NUM> are bevel gears, in one embodiment, an axis of motor <NUM> (referring to <FIG>) is parallel to the valve rod <NUM> (referring to <FIG>). That is, the axis of motor <NUM> and the valve rod <NUM> are arranged side by side, and approximately in parallel, so as to reduce the space occupied by the motor <NUM> in the radial direction of the connecting gear <NUM>, which is conducive to reducing the size of the plug valve <NUM> in the radial direction of the connecting gear <NUM>, making the structure of the plug valve <NUM> more compact.

In another embodiment, the axis of the motor <NUM> intersects the valve rod <NUM>. An included angle between an extending direction of the axis of the motor <NUM> and an extending direction of the valve rod <NUM> can be a right angle or an acute angle, with such an arrangement, the motor <NUM> is installed in the radial direction of the connecting gear <NUM>, so that the occupied space of the motor <NUM> in a length direction of the valve rod <NUM> can be reduced, and the size of the plug valve <NUM> in the length direction of the valve rod <NUM> is reduced.

Referring to <FIG> or <FIG>, in an embodiment, a diameter of the transmission gear <NUM> is smaller than a diameter of the connecting gear <NUM>. According to the embodiments of the present application, when the rotating speed of the motor <NUM> is consistent, the rotating speed of the connecting gear <NUM> is mainly affected by the number of the transmission tooth sections <NUM> on the transmission gear <NUM> and the number of the meshing teeth <NUM> on each transmission tooth section <NUM>. Therefore, when the number of the transmission tooth sections <NUM> on the transmission gear <NUM> and the number of the meshing teeth <NUM> on each transmission tooth section <NUM> meet the transmission requirement, the diameter of the transmission gear <NUM> can be set to be smaller than the diameter of the connecting gear <NUM>, so that the occupied space of the transmission gear <NUM> can be reduced, and the structural compactness of the plug valve <NUM> is improved. Of course, in other embodiments, the diameter of the transmission gear <NUM> and the diameter of the connecting gear <NUM> can be substantially the same. In addition, the motor <NUM> can be provided as a speed reduction motor <NUM>.

Referring to <FIG> and <FIG>, in an embodiment, the valve rod <NUM> is movable along its length direction, so as to have an ignition position below. At the ignition position, the valve rod <NUM> triggers the ignition switch <NUM>. In particular, the valve rod <NUM> also has a fire-off position above the ignition position. The ignition position and the fire-off position are two positions when the valve rod <NUM> moves along the length direction of the valve rod <NUM>. When the valve rod <NUM> is switched between the ignition position and the fire-off position, the valve rod <NUM> does not rotate. At the ignition position, the valve rod <NUM> is rotatable. When the valve rod <NUM> is at the closing gear, the valve rod <NUM> can be switched between the ignition position and the fire-off position. When the plug valve <NUM> is started for ignition, the valve rod <NUM> needs to be pressed down to the ignition position, so that the valve rod <NUM> triggers the ignition switch <NUM> to provide an ignition signal to a pulse igniter, so that the pulse igniter is started for ignition. At this time, the valve rod <NUM> is manually rotated, so that the valve rod <NUM> rotates from the closing gear to a firepower gear, the valve is opened to let the gas get in, so that the gas stove is ignited.

In an embodiment, when the valve rod <NUM> is at the fire-off position, the connecting gear <NUM> and the transmission gear <NUM> are spaced from each other in the axial direction of the connecting gear <NUM> (i.e., the length direction of the valve rod <NUM>). When the valve rod <NUM> rotates to a firepower gear, the connecting gear <NUM> faces the vacant section <NUM> of the transmission gear <NUM>, that is, the transmission tooth section <NUM> can mesh with the connecting gear <NUM>, at this time, if the motor <NUM> is started to drive the transmission gear <NUM> to rotate, the transmission tooth section <NUM> can mesh with the connecting gear <NUM>. When tuning off the fire is needed, the valve rod <NUM> is rotated to the closing gear to close the valve, and the valve rod <NUM> can move to the fire-off position, so that the connecting gear <NUM> and the transmission gear <NUM> are spaced from each other in the axial direction. Therefore, even if the motor <NUM> is started when the gas stove is in an off-fire state, the motor <NUM> and the transmission gear <NUM> cannot drive the valve rod <NUM> to rotate, so that the reliability and the safety of the plug valve <NUM> are greatly improved. Of course, in other embodiments, at either the fire-off position or the ignition position, the transmission tooth section <NUM> can be engaged with the connecting gear <NUM>.

With reference to <FIG>, in an embodiment, the connecting gear <NUM> is located at one end of the mounting convex ring <NUM> on the mounting seat <NUM> away from the valve body <NUM>. The mounting seat <NUM> is also provided with a supporting portion <NUM> protruded along a protruding direction of the mounting convex ring <NUM>. The motor <NUM> is fixed to one side of the supporting portion <NUM> facing the valve body <NUM>. The motor <NUM> is passed through the supporting portion <NUM>. The transmission gear <NUM> is located on a surface of the supporting portion <NUM> away from the valve body <NUM> and engages with the connecting gear <NUM>. In this way, the transmission gear <NUM> and the connecting gear <NUM> are substantially in the same plane, which not only ensures that the transmission gear <NUM> and the connecting gear <NUM> can be better engaged, but also reduces the length of the rotating shaft of the motor <NUM>, the possibility of bending and deformation of the rotating shaft of the motor <NUM> during the rotating of the transmission gear <NUM> is reduced, so that the rotating stability of the connecting gear <NUM> is better.

In one embodiment, the plug valve <NUM> further includes a controller and a wireless communication module. The controller is electrically connected to the wireless communication module and the driving mechanism. The wireless communication module is configured for communicating with an external terminal to receive a control instruction from the external terminal, and the controller is configured for controlling the driving mechanism to drive the valve rod <NUM> to rotate according to the control instruction. In this way, the wireless communication module is in communication with the external terminal to receive the control instruction from the external terminal. After the controller receives the control instruction of the external terminal through the wireless communication module, the driving mechanism can be controlled to drive the valve rod <NUM> to rotate according to the control instruction, so that the firepower of the gas stove can be adjusted or the gas stove is turned off. That is, when the user needs to adjust the firepower of the gas stove or to turn off the gas stove in the cooking process, the user only needs to send a corresponding control instruction to the gas stove through the external terminal, so that the user does not need to enter the kitchen to operate the gas stove. The user can conveniently adjust the firepower and turn off the fire of the gas stove, and the use convenience of the user is improved. Of course, in other embodiments, a control button can be provided on the gas stove, so that the valve rod <NUM> can be adjusted through the control button controlling the driving structure, and the valve rod <NUM> can also be adjusted through the external terminal controlling the driving structure.

In one embodiment, the wireless communication module is a Bluetooth module, a radio frequency module or a WiFi module. Therefore, the power consumption of the gas stove is low, and the power source can be saved.

Referring to <FIG>, <FIG> and <FIG>, in an embodiment, when the controller receives a fire-off instruction through the wireless communication module or when the cooking program is over and the fire is automatically turned off, the controller controls the motor <NUM> to drive the valve rod <NUM> to rotate. When the valve rod <NUM> rotates to the closing gear, the vacant section <NUM> faces the connecting gear <NUM>, so that when the transmission gear <NUM> triggers the controlling switch <NUM>, the transmission gear <NUM> is in a state that the vacant section <NUM> faces the connecting gear <NUM>. When the valve rod <NUM> rotates to the closing gear, the valve rod <NUM> can move to the fire-off position. Under the driving of the motor <NUM>, when the valve rod <NUM> rotates to the closing gear, the valve rod <NUM> triggers the change-over switch <NUM>, so that when the transmission gear <NUM> triggers the controlling switch <NUM> again, the motor <NUM> stops rotating. That is, when the controlling switch <NUM> is triggered by the transmission gear <NUM> to generate the trigger signal, the transmission gear <NUM> is located at a position where the meshing of the transmission tooth section <NUM> with the connecting gear <NUM> is ended, and the vacant section <NUM> faces the connecting gear <NUM>. In other words, when the meshing of the transmission tooth section <NUM> with the connecting gear <NUM> is ended, and the connecting gear <NUM> faces the vacant section <NUM>, the transmission gear <NUM> triggers the controlling switch <NUM> to generate the trigger signal.

When a fire-off instruction is sent to the controller through the external terminal or the menu program is over and the fire is automatically turned off, the controller controls the motor <NUM> to drive the valve rod <NUM> to rotate towards the closing gear. When the valve rod <NUM> is rotated to the closing gear, the valve rod <NUM> can trigger the change-over switch <NUM>, and at the same time the valve rod <NUM> can be automatically switched to the fire-off position, so that the connecting gear <NUM> and the transmission gear <NUM> are spaced from each other in the axial direction of the connecting gear <NUM>. When the valve rod <NUM> triggers the change-over switch <NUM>, the controller detects a trigger signal of the change-over switch <NUM>, and takes the trigger signal as one of indication signals for controlling the motor <NUM> to stop rotating. Only After the controller detects that the change-over switch <NUM> is triggered by the valve rod <NUM> to generate the trigger signal, and the controller further detects that the controlling switch <NUM> is triggered by the transmission gear <NUM> to generate an electrical signal of a trigger signal, the controller controls the motor <NUM> to stop rotating. Thus, after the gas stove is turned off, it is ensured that the transmission gear <NUM> is in the state of the vacant section <NUM> facing the connecting gear <NUM>, so as to ensure that the vacant section <NUM> of the transmission gear <NUM> faces the connecting gear <NUM> when the valve rod <NUM> is pressed for ignition next time, to avoid the interference between the connecting gear <NUM> and the transmission tooth section <NUM> on the transmission gear <NUM>, and improving the reliability of the plug valve <NUM>. Moreover, two functions are realized by using the same change-over switch <NUM>, the number of switches on the plug valve <NUM> can be reduced, and the structure of the plug valve <NUM> is simplified. Of course, in other embodiments, another change-over switch <NUM> can be provided to provide an indication signal for controlling the motor <NUM> to stop. In some embodiments, another method can be employed to determine that the valve rod <NUM> has rotated to the closing gear, and provide a trigger signal for the controller to control the motor <NUM> to stop.

When the change-over switch <NUM> is a microswitch, the notch <NUM> on the valve rod <NUM> can be extended in the circumferential direction of the valve rod <NUM>, and to ensure that when the valve rod <NUM> rotates to the preset firepower gear, the pressing portion of the change-over switch <NUM> is located in the notch <NUM>, and when the valve rod <NUM> rotates to the closing gear, the pressing portion of the change-over switch <NUM> can also be located in the notch <NUM>. In some embodiments, two notches <NUM> can be provided on the valve rod <NUM>, when the valve rod <NUM> rotates to the preset firepower gear, the pressing portion of the change-over switch <NUM> is located in one of the notches <NUM>, and when the valve rod <NUM> rotates to the closing gear, the pressing portion of the change-over switch <NUM> is located in the other notch <NUM>.

Referring to <FIG> and <FIG>, in an embodiment, when the change-over switch <NUM> is a microswitch, the valve rod <NUM> is provided with a notch <NUM>, when the valve rod <NUM> is located either at the minimum firepower gear or at the closing gear, the valve rod <NUM> is located in the notch <NUM>. When the valve rod <NUM> is located between the minimum firepower gear and the closing gear, the pressing portion of the change-over switch <NUM> abuts against a peripheral surface of the valve rod <NUM>, and the change-over switch <NUM> outputs signals when the valve rod <NUM> rotates to make the state of the change-over switch <NUM> changes, and to control the motor <NUM> to rotate through the controller. In this way, it is possible that only one notch <NUM> is provided, so that the machining process of the valve rod <NUM> can be reduced, and the structure of the valve rod <NUM> can be simplified.

In one embodiment, the plug valve <NUM> further includes a controller and a temperature sensor. The controller is electrically connected to the temperature sensor and the driving mechanism, the temperature sensor is configured for detecting a temperature of a cooking utensil, and the controller is further configured for controlling the driving mechanism to drive the valve rod <NUM> to rotate according to the temperature. In some embodiments, in the automatic fire control mode, the controller can control the driving motor <NUM> to drive the valve rod <NUM> to rotate according to a preset cooking program, so that the firepower of the gas stove can be automatically adjusted. When the automatic ignition mode is started, the temperature of the cooking utensil can be detected in real time through the temperature sensor, so that the controller can control the driving mechanism to drive the valve rod <NUM> to the target firepower gear according to the preset program and the temperature, and the precision of the automatic fire control mode of the gas stove can be improved. Of course, in other embodiments, the temperature sensor can be omitted.

The present application further provides a gas stove. The gas stove includes a stove body and a plug valve whose structure can make reference to the above embodiments. For the gas stove adopts all the above embodiments, the gas stove at least has all the beneficial effects brought by the above embodiments, which are not repeated here. The plug valve is arranged on the stove body.

Claim 1:
A plug valve (<NUM>) comprising:
a valve seat (<NUM>);
a valve rod (<NUM>) mounted on the valve seat (<NUM>);
a driving mechanism mounted on the valve seat (<NUM>) and connected to the valve rod (<NUM>) to drive the valve rod (<NUM>); wherein the plug valve (<NUM>) has an automatic fire control mode and a manual fire control mode, wherein in the automatic fire control mode, the driving mechanism is controlled to drive the valve rod (<NUM>) to rotate to adjust the firepower; and wherein in the manual fire control mode, the valve rod (<NUM>) is manually adjusted and rotated; and
characterized in that the plug valve (<NUM>) comprising
a change-over switch (<NUM>) mounted on the valve seat (<NUM>) and electrically connected to the driving mechanism,
wherein when the valve rod (<NUM>) is rotated to trigger the change-over switch (<NUM>), the plug valve (<NUM>) is switched to the automatic fire control mode.