Gas stove timer

Abstract

The invention discloses a gas stove timer, comprising a box body and a circuit board arranged in the box body, wherein the box body is provided with a swivel, one end of the swivel has a connector matched with a gas valve of a gas stove, and the other end of the swivel is provided with a knob; the swivel is driven by a motor through a transmission mechanism, the motor is set to run for a time by a control system, and the motor automatically stops only when the load current of the motor exceeds the rated current. The whole product has a compact structure, a small volume, a large swivel power transmission, a high sensitivity, and can achieve timing, punctual and complete closing of the gas valve, has a wide range of applications, a stable structure and a long service life.

Description

Technical Field

[0001] The invention relates to a gas appliance control technology, in particular to a gas stove timer. Background Art

[0002] Although there are many forms of gas stove timers in the public technology, there are not many mature and practical ones, such as pure mechanical products, patent announcement number CN2120977U, a gas stove timer, a gas stove timer composed of a bottom plate, a timer, a positioning rod, a compression spring and a switch clip, the positioning rod is a steel sheet with serrations, one end of which is provided with an elongated hole, and a tension spring and a steel wire rope are installed; the positioning rod moves left and right with a rivet as a fulcrum to realize the switch of closing the gas stove by using the tension spring. Another example is patent announcement number CN2911483Y, a support rod is sleeved on the shaft, one side of the support rod is provided with a convex tip that matches the notch of the turntable, the other side of the support rod is connected to the air inlet switch, a connecting hose is arranged in the housing of the mechanical timer, one end of the connecting hose is connected to the air outlet joint, and the other end of the connecting hose is connected to the outlet end of the air inlet switch. Another example is the electrically controlled gas stove timing device with patent announcement number CN202338928U, which includes a power supply, a timer and a motor. The positive pole of the power supply is connected to the positive pole of the timer, the negative pole of the timer is connected to the positive pole of the motor, the negative pole of the motor is connected to the negative pole of the power supply, the rotating shaft of the motor is externally connected to the rotating switch of the gas stove switch, and the rotating shaft of the motor rotates coaxially with the rotating shaft of the gas stove switch. These products mainly have the following problems: for low-cost products, the purely mechanical time measurement accuracy is low, the overly complex structure is not conducive to miniaturization, the overly simple structure has poor transmission stability, and the power consumption is high and the service life is short, etc. Summary of the invention

[0003] The purpose of the present invention is to solve the above problems and provide a gas stove timer, which has the characteristics of high stability, self-selection of delay number according to different cooking products, adaptability to the matching of safe ignition device, large rotation angle, high sensitivity, and complete gas valve closure.

[0004] The above technical problems of the present invention are mainly solved by the following technical solutions: a gas stove timer, comprising a box body and a circuit board arranged in the box body, characterized in that a rotating shaft is provided in the box body, one end of the rotating shaft has a connector that cooperates with a gas valve of the gas stove, and the other end of the rotating shaft is provided with a knob; the rotating shaft is driven by a motor through a transmission mechanism, the running time of the motor is set by a control system, and / or the motor automatically stops only when the load current of the motor exceeds the rated current.

[0005] In the aforementioned gas stove timer, preferably, the rotation direction of the motor is limited by a transmission mechanism; the rotating shaft is engaged with a connector that matches the gas valve of the gas stove through a clutch mechanism.

[0006] In the aforementioned gas stove timer, preferably, the transmission mechanism includes a gear box, and the rotating shaft is passed through the gear box; a worm is provided on the motor output shaft, the worm drives the worm wheel, and the worm wheel drives the main gear mounted on the rotating shaft through a gear set.

[0007] In the aforementioned gas stove timer, preferably, a reset spring is provided on the rotating shaft, a clutch tooth hole is provided in the inner hole of the main gear, the rotating shaft has a guide section with a thickness more than twice that of the main gear, and a clutch rack matching the clutch tooth hole of the main gear is provided on the circumference of the guide section.

[0008] In the aforementioned gas stove timer, preferably, the number of teeth of the clutch rack is less than the number of teeth of the clutch tooth hole of the main gear, the clutch rack is evenly distributed on the circumference of the guide section, and the end of the clutch rack facing the knob is a cone-shaped tip.

[0009] In the aforementioned gas stove timer, preferably, a panel is provided on the top surface of the box body, and a touch switch and a display screen cooperating with the circuit board are provided on the panel.

[0010] In the aforementioned gas stove timer, preferably, the circuit board is provided with a USB socket, the box body is provided with a through hole matching with the USB socket and a waterproof cover matching with the USB socket and the through hole.

[0011] In the aforementioned gas stove timer, preferably, a bottom cover is provided at the bottom of the box body, and a plug-in hole for a height adjustment block is provided on the bottom cover.

[0012] In the aforementioned gas stove timer, preferably, the transmission mechanism includes a gear box, which is composed of an upper gear box body and a lower gear box body. A motor fixing seat is provided in the upper gear box body, and a reset spring hole seat is provided in the lower gear box body; the reset spring is a conical compression spring.

[0013] In the aforementioned gas stove timer, as a preferred embodiment, when the timer counts down to 00:00 00, the buzzer alarms, and at the same time, the timing control main IC outputs a signal to turn on the switch tube Q1, inputs the power supply voltage to the input end of the boost circuit, and the boost output connects the motor B1 to start the motor rotating; when the gas stove valve is closed and the motor cannot continue to drive, the switch tube Q3 control end generates a high level to turn on the switch tube Q3, and after the timing control main IC input end receives a low electrical signal, the output signal is turned off to disconnect the switch tube Q1, the boost circuit loses power, and the motor stops rotating.

[0014] This technical solution designs this "gas stove timer" into a complete product, which can be used in the control switches of various gas stoves on the market. All functional components such as circuit boards and rotating shafts are arranged in the box body, wherein one end of the rotating shaft extends out of the box body to cooperate with the gas valve, and the other end of the rotating shaft also extends out of the box body to connect to the manual knob. The rotating shaft is driven by a motor and a transmission mechanism, and the motor is controlled by a circuit board (including an integrated block) to set parameters such as the running time. After the motor is started, it will automatically stop only when the motor load current exceeds the rated current to ensure that the gas valve is completely closed.

[0015] The rotation direction of the swivel of the device is limited by the transmission mechanism, and the output power and unidirectional rotation are guaranteed by the rotation mechanism, thereby avoiding the uncertainty of the rotation direction caused by the reversal of the swivel, and the connection body between the swivel and the gas valve is completed by the engagement of the clutch mechanism. When ignition is started, the manual knob is pressed down to disengage the transmission mechanism from the swivel, and when the ignition is completed, the swivel is engaged with the transmission mechanism through the clutch mechanism, so as to achieve the purpose of automatically closing the gas valve at a certain time.

[0016] Furthermore, the transmission mechanism is mainly arranged in the gear box, the swivel is installed in the gear box, the unidirectional rotation of the swivel is completed by the worm and the intermediate worm gear on the motor output shaft, and then the worm gear transmits power to the gear set. The up and down clutch mechanism of the swivel is mainly realized by the reset spring and the main gear, with a simple structure, flexible and durable. Moreover, the inner hole of the main gear is provided with a clutch tooth hole, and the circumference of the swivel guide section is provided with a clutch rack that matches the clutch tooth hole. This structure with few teeth and a guide cone tip ensures that the swivel can be easily and smoothly clutched up and down.

[0017] The device is easy to operate. A panel is provided on the top of the box body. Various function switches, as well as adjustment prompt elements such as a display screen and a buzzer are provided on the panel. A USB port is also provided with a waterproof cover to meet the need for protecting the charging port in a kitchen environment.

[0018] It is worth noting that in order to meet the requirements of gas stove ignition control switches of different heights, this device is provided with an auxiliary plug-in hole on the bottom cover at the bottom of the box body, and different types of height adjustment blocks can be selected according to the actual height of the ignition control switch for quick installation.

[0019] Compared with the prior art, the beneficial effects of the present invention are: the entire product has a compact structure, a small volume, a large rotating shaft power transmission, a high sensitivity, and can achieve regular, timely and complete closure of the gas valve, a wide range of applications, a stable structure and a long service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the appearance structure of the present invention.

[0021] Figure 2 yes Figure 1 Top view of the .

[0022] Figure 3 , Figure 4 It is a schematic diagram of the internal arrangement and internal structure of the present invention.

[0023] Figure 5 It is a schematic diagram of the transmission mechanism structure of the present invention.

[0024] Figure 6 It is a schematic diagram of a rotating shaft structure of the present invention.

[0025] Figure 7 It is a three-dimensional schematic diagram of the internal structure of a gear box of the present invention.

[0026] Figure 8 It is an exploded view of the present invention.

[0027] Fig. 9 The invention discloses a closing control circuit diagram.

[0028] In the figure: 1. knob, 2. box body, 201. panel, 2011. touch switch, 2012. waterproof cover, 2013. display screen, 2014. buzzer, 202. motor, 203. gear box, 2031. gear set, 2032. lower gear box body, 2033. upper gear box body, 204. circuit board, 205. bottom cover, 206. return spring, 207. swivel, 2071. knob shaft head, 2072. guide section, 2073. limit shoulder, 2074. D-type external hole, 3. height adjustment block, 4. battery. DETAILED DESCRIPTION

[0029] The technical solution of the present invention is further specifically described below through embodiments and in conjunction with the accompanying drawings.

[0030] A gas stove timer, the appearance of which is shown in Figure 1 , Figure 2 , including a box body 2 as the main body, a knob 1 connected to a rotating shaft 207 at the upper end of the box body 2, and a height adjustment block 3 connected to the lower end of the box body 2. A panel 201 is arranged on the top surface of the box body 2, and a touch switch 2011 is arranged on the panel 201 to cooperate with the circuit board 204. The touch switch 2011 includes a power button, a time value setting [hour: minute: second], a clear, "+", "-" and other basic function keys; an LCD display screen 2013, which can display time value, power supply, working indicator light and other contents; and a buzzer 2014 is installed. A USB socket is arranged on the circuit board 204, and a through hole is arranged on the panel 201 to cooperate with the USB socket. A waterproof cover 2012 is hung on the box body 2 to cooperate with the USB socket and the through hole on the panel 201.

[0031] The box body 2 is a basically closed square space body consisting of a main box including a panel 201 and a bottom cover 205 located at the bottom thereof. The circuit board 204 is fixed at the bottom of the main box of the box body 2 and is close to the panel 201. The rotating shaft 207 is arranged with the center of the box body 2 as the axis, and the lower end of the rotating shaft 207 has a connector that matches the gas valve of the gas stove. The running time of the motor is set by the control system. The bottom cover 205 of the box body 2 is provided with an insertion hole for the height adjustment block 3, and the height adjustment block 3 is provided with a pin that matches the insertion hole.

[0032] The rotating shaft 207 is driven by the motor 202 through the transmission mechanism, and the rotating direction is limited by the transmission mechanism, and the connecting body of the rotating shaft 207 and the gas valve of the gas stove is meshed through the clutch mechanism. Figures 3 to 5 As shown, the transmission mechanism mainly includes a gear box 203, and a rotating shaft 207 is arranged in the gear box; a worm is arranged on the output shaft of the motor 202, and the worm drives the worm wheel, and the worm wheel drives the main gear sleeved on the rotating shaft 207 through the gear set 2031. The structure of the rotating shaft 207 is as follows Figure 6 As shown, it is divided into two sections, upper and lower, with the limiting shoulder 2073 as the boundary. The lower section is provided with a reset spring 206, and the upper section is first a guide section 2072 which is more than twice the thickness of the main gear, and then a knob shaft head 2071 which cooperates with the knob 1. A D-shaped external hole 2074 is provided in the axial inner hole at one end which cooperates with the gas valve of the gas stove; a clutch tooth hole is provided in the inner hole of the main gear, and three clutch racks which are evenly distributed on the circumference of the guide section 2072 and cooperate with the clutch tooth hole are provided on the circumference of the guide section 2072 of the rotating shaft 207. The length of the clutch rack is less than the thickness of the main gear, and the end of the clutch rack facing the knob 1 is a cone-shaped body, and the teeth in the clutch tooth hole of the main gear at one end facing the cone-shaped body have an outward arc structure between the two teeth.

[0033] Further, the transmission mechanism includes a gear box 203, see Figure 7 , Figure 8 The gear box 203 is a closed structure composed of an upper gear box body 2033 and a lower gear box body 2032. The upper gear box body 2033 is provided with a motor 202 fixing seat specifically for installing the motor 202. The lower gear box body 2032 is provided with a return spring 206 hole seat. The return spring 206 hole seat is coaxial with the central axis of the box body 2, and the return spring 206 is a conical compression spring.

[0034] When in use, open the waterproof cover 2012 to charge, and the display screen 2013 shows that the battery is full and the charging is finished. Generally, it can be used for about 6 months. When the knob 1 is pressed, the reset spring 206 shrinks at the same time, and the clutch rack on the circumference of the guide section 2072 of the rotating shaft 2072 is disengaged from the main gear. Only then can the gas valve of the gas stove be opened and the ignition can be started by turning right at the same time, and the size of the fire can be adjusted arbitrarily within 180 degrees. When the hand is released, the spring reset 206 automatically resets the rotating shaft 2072, and the clutch rack on the circumference of the guide section 2072 naturally meshes with the clutch tooth hole of the main gear (i.e., the tooth is hung). When the countdown reaches 00:00:00, the buzzer alarms, and the motor 202 starts to close the gas valve and turn off the fire. The user sets the shutdown time by touching the switch 2011.

[0035] Gas stove shut-off control circuit, such as Fig. 9 As shown: it includes a timing control chip U1, a motor power supply circuit and a motor voltage feedback circuit, an output end of the timing control chip U1 is connected to the control end of the switch tube Q1 of the motor power supply circuit, and the motor voltage feedback circuit includes a voltage sampling circuit connected to an input end of the timing control chip U1, and the voltage sampling circuit is provided with a switch tube Q3 whose control end is connected to the motor B1. The voltage sampling circuit includes a switch tube Q3 whose one end is connected to the power supply through a resistor and the other end is grounded, and the connection end between the resistor and the switch tube Q3 is connected to an input end of the timing control chip U1. The control end of the switch tube Q1 is grounded after passing through a resistor and a transistor Q6 in sequence, and the base of the transistor Q6 is connected to an output end of the timing control chip U1 through a resistor.

[0036] The working principle is as follows: U1 is a timing control chip. When the countdown reaches 00:00 00, the buzzer in the sound alarm circuit alarms, and U1 outputs a signal to turn on Q1, input the power supply voltage to the input end of the boost circuit, and the boost output 6V turns on the motor B1, so that the motor starts to rotate. When the gas stove valve is closed and the motor cannot rotate, the Q3 control end generates a high level, turning on Q3. After the U1 input end receives a low-power signal, the output model is turned off to disconnect Q1, the boost circuit loses power, and the motor stops rotating, completing the shutdown work.

[0037] The above embodiments are for illustration of the present invention. Any process, method, structure, etc. that are simply modified from the present invention shall fall within the protection scope of the present invention.

Claims

1. A gas stove timer, comprising a box body (2) and a circuit board (204) arranged in the box body, characterized in that A rotating shaft (207) is provided in the box body, one end of the rotating shaft has a connector that cooperates with the gas valve of the gas stove, and the other end of the rotating shaft is provided with a knob (1); the rotating shaft is driven by a motor (202) through a transmission mechanism, the motor has a running time set by a control system, and the motor automatically stops only when the load current of the motor exceeds the rated current; The rotation direction of the rotating shaft (207) is limited by a transmission mechanism, and the connecting body of the rotating shaft (207) and the gas valve of the gas stove is meshed through a clutch mechanism; The transmission mechanism comprises a gear box (203), and a rotating shaft (207) is arranged in the gear box; a worm is arranged on the output shaft of the motor (202), the worm drives a worm wheel, and the worm wheel drives a main gear sleeved on the rotating shaft through a gear set (2031); The rotating shaft (207) is provided with a return spring (206), the inner hole of the main gear is provided with a clutch tooth hole, the rotating shaft has a guide section (2072) with a thickness more than twice that of the main gear, and a clutch rack matched with the clutch tooth hole of the main gear is provided on the circumference of the guide section; the number of teeth of the clutch rack is less than the number of teeth of the clutch tooth hole of the main gear, the clutch rack is evenly distributed on the circumference of the guide section, and the end of the clutch rack facing the knob (1) is a cone-shaped body; When the timer counts down to 00:00 00, the buzzer alarms, and the timing control main IC outputs a signal to turn on the motor power supply circuit switch tube (Q1), input the power supply voltage to the boost circuit input end, and the boost output connects the motor B1 (202), so that the motor starts to rotate; when the gas stove valve is closed and the motor can no longer be driven, the voltage sampling circuit switch tube (Q3) control end generates a high level, so that the voltage sampling circuit switch tube (Q3) is turned on, and after the timing control main IC input end receives a low-level signal, the output signal is turned off to disconnect the motor power supply circuit switch tube (Q1), the boost circuit loses power, and the motor stops rotating.

2. The gas stove timer according to claim 1, characterized in that: The top surface of the box body (2) is provided with a panel (201), and the panel is provided with a touch switch (2011) and a display screen (2013) that cooperate with the circuit board (204).

3. The gas stove timer according to claim 1 or 2, characterized in that: The circuit board (204) is provided with a USB socket, and the box body (2) is provided with a through hole that cooperates with the USB socket and a waterproof cover (2012) that cooperates with the USB socket and the through hole.

4. The gas stove timer according to claim 1 or 2, characterized in that: The bottom of the box body (2) is provided with a bottom cover (205), and the bottom cover is provided with an insertion hole for the height adjustment block (3).

5. The gas stove timer according to claim 1, characterized in that: The transmission mechanism comprises a gear box (203), the gear box comprising an upper gear box body (2033) and a lower gear box body (2032), the upper gear box body being provided with a motor (202) fixing seat, the lower gear box body being provided with a return spring (206) hole seat; the return spring being a conical compression spring.

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