CN107607209B

CN107607209B - Gas stove and embedded dry-burning-preventing temperature sensor thereof

Info

Publication number: CN107607209B
Application number: CN201711045838.2A
Authority: CN
Inventors: 戴相录; 许曼曼; 谭柏豪; 季俊生
Original assignee: Midea Group Co Ltd; Guangdong Midea Kitchen Appliances Manufacturing Co Ltd
Current assignee: Midea Group Co Ltd; Guangdong Midea Kitchen Appliances Manufacturing Co Ltd
Priority date: 2017-10-31
Filing date: 2017-10-31
Publication date: 2023-06-20
Anticipated expiration: 2037-10-31
Also published as: CN107607209A

Abstract

The invention relates to the technical field of gas cookers, in particular to a gas cooker and an embedded dry-burning-preventing temperature sensor thereof, which comprises a temperature sensor body, a lifting mechanism connected with the temperature sensor body and used for driving the temperature sensor body to lift, and a control system used for controlling the lifting stroke of the temperature sensor body, so that the temperature sensor body can be contacted with the bottom of a pot. According to the temperature sensor, the lifting mechanism drives the temperature sensor body to move up and down, so that the lifting amount of the temperature sensor is increased, the lifting stroke of the temperature sensor body is controlled by the control system, the temperature sensor body and the bottom of the cooker can be in close contact all the time, the detection precision is improved, and the phenomenon that the outer convex bottom of the cooker is jacked up by the temperature sensor and the inner concave bottom of the cooker cannot be in contact with the temperature sensor due to insufficient stroke of the traditional temperature sensor is avoided.

Description

Gas stove and embedded dry-burning-preventing temperature sensor thereof

Technical Field

The invention relates to the technical field of gas cookers, in particular to an embedded dry-burning-preventing temperature sensor and a gas cooker comprising the embedded dry-burning-preventing temperature sensor.

Background

At present, a stove with a dry burning prevention function of an embedded gas stove is provided with a temperature sensor for detecting the bottom temperature of a pot 8 at the center of a burner. When the temperature detected by the temperature sensor reaches a preset value, the stove is judged to be dry-burned, and the stove is stopped, so that the dry-burned prevention function of the stove is realized. The current dry-burning prevention temperature sensor is usually stretched out of the surface of a kitchen range burner when being installed, after the cooker 8 is placed, the internal spring of the temperature sensor is compressed to enable the surface of the temperature sensor to be in contact with the bottom of the cooker 8 with a certain pressure, and the lower end of the temperature sensor is fixed relative to a gas cooker, as shown in fig. 1.

However, the above-described mounting manner of the temperature sensor has mainly four drawbacks: (1) The bottom of the cooker with the concave part of the cooker 8 causes the compression amount of the spring to be too small, the contact pressure to be smaller, the interface thermal resistance to be large, the rapid heat transfer to be unfavorable, and the temperature measurement error to be larger; (2) The spring stroke is limited, when the temperature sensor is installed to be lower, the cooker 8 with the bottom of part of the cooker being concave cannot be contacted with the temperature sensor, as shown in fig. 2; when the temperature sensor is installed upwards, part of cookers 8 with bottoms protruding outwards are supported by the temperature sensor and cannot be stably placed, as shown in fig. 3; (3) In order to make the bottom of the pan well contacted with the temperature sensor, the bottom of the pan needs to be contacted with the temperature sensor in parallel and pressed down vertically in the process of placing the pan, otherwise, the temperature sensor is easy to be in inclined contact with the bottom of the pan, so that the contact area is smaller, and the temperature measurement error is larger, as shown in fig. 4; (4) The exposed temperature sensor is easy to deflect after long-term use, the probability of the temperature sensor and the bottom of the cooker 8 are easy to generate deflection contact is increased, and meanwhile, the deflected temperature sensor influences the beauty of the cooker.

Disclosure of Invention

First, the technical problem to be solved

The invention aims to provide an embedded dry-burning prevention temperature sensor of a gas stove, which aims to at least solve one of the technical problems in the prior art or related technologies.

Another object of the present invention is to provide a gas stove, which aims to solve at least one of the technical problems existing in the prior art or related technologies.

(II) technical scheme

In order to solve the technical problems, the invention provides an embedded dry-heating preventing temperature sensor of a gas stove, which comprises a temperature sensor body, a lifting mechanism connected with the temperature sensor body and used for driving the temperature sensor body to lift, and a control system used for controlling the lifting stroke of the temperature sensor body, so that the temperature sensor body can be in contact with the bottom of a pot. According to the temperature sensor, the temperature sensor body is driven to move up and down through the lifting mechanism, so that the lifting amount of the temperature sensor body is increased, the lifting stroke of the temperature sensor body is controlled through the control system, so that the temperature sensor body can be in close contact with the bottoms of cookware with different bottom shapes all the time, the detection precision is improved, and the phenomenon that the outer convex bottom of the cooker is jacked up by the temperature sensor and the inner concave bottom of the cooker cannot be in contact with the temperature sensor due to insufficient stroke of the traditional temperature sensor is avoided.

The temperature sensor comprises a temperature sensor body and is characterized in that the temperature sensor body comprises an inner tube and an outer end cover corresponding to the inner tube, the outer end cover comprises a heat shield and a cover part connected to the heat shield, a thermal sensitive element is arranged on the cover part, an elastic element is arranged between the outer end cover and the inner tube, and a wire connected with the thermal sensitive element is arranged in the inner tube.

The control system comprises a controller and a judging device for judging whether the compression amount of the elastic element reaches a preset value, and when the judging device judges that the compression amount of the elastic element reaches the preset value, the controller controls the lifting mechanism to stop lifting so as to control the lifting stroke of the temperature sensor body by controlling the compression amount of the elastic element.

The judging device comprises a limit switch arranged on the inner tube, when the elastic element reaches a preset compression amount, the lower end of the heat shield can touch the limit switch, and the limit switch is connected with the controller so as to control whether the compression amount reaches a preset value or not through the cooperation of the limit switch and the heat shield, thereby controlling the lifting stroke of the lifting mechanism.

The judging device comprises a limit switch arranged on the inner tube, a sensitive block is arranged on the wire, when the elastic element reaches a preset compression amount, the sensitive block on the wire can touch the limit switch, and the limit switch is connected with the controller so as to control whether the compression amount reaches a preset value or not through the cooperation of the limit switch and the sensitive block on the wire, thereby controlling the lifting stroke of the lifting mechanism.

The control system comprises a controller connected with the motor, and the controller controls the ascending stroke of the lifting mechanism according to whether the output torque of the motor reaches a preset value or not so as to control the compression amount to reach the preset value or not by controlling the output torque of the motor, thereby controlling the ascending stroke of the lifting mechanism.

The heat insulation cover is characterized in that the cover part is provided with an outer eave, and the diameter of the outer eave is larger than the outer diameter of the heat insulation cover so as to prevent coarse particles from entering a central through hole of the fire cover.

The diameter of the outer eave is smaller than that of the central through hole of the fire cover of the burner, so that the outer eave can enter the central through hole of the fire cover.

The lifting mechanism comprises a fixed bracket for fixing the temperature sensor, a support frame, a transmission assembly and a threaded rod, wherein the axis of the threaded rod is in a horizontal direction and is rotationally connected with the support frame; the transmission assembly comprises a nut and an upper connecting rod which are matched with the threaded rod, and two ends of the upper connecting rod are respectively hinged with the fixed support and the nut. The temperature sensor is simple in structure and reliable in transmission by adopting the lifting mechanism driven by the threaded screw.

The lifting mechanism comprises a fixed support, a support frame and a screw rod, wherein the fixed support is used for fixing the temperature sensor body, the screw rod is arranged in the vertical direction on the axis of the screw rod, the screw rod is rotatably connected with the support frame, the fixed support comprises a fixed support body, a connecting portion is arranged on the fixed support, and an internal thread matched with the screw rod is arranged on the connecting portion. . The temperature sensor is simple in structure and reliable in transmission by adopting the lifting mechanism driven by the screw rod.

The lifting mechanism comprises a fixing support, a cam and a supporting frame, wherein the fixing support is used for fixing the temperature sensor body, the supporting frame is used for supporting the cam, the fixing support comprises a fixing support body, a transverse sliding groove is formed in one side of the fixing support body, and the free end of the cam is in sliding connection with the transverse sliding groove. The temperature sensor adopts the lifting mechanism driven by the cam, so that the temperature sensor has simple structure and reliable transmission.

The lifting mechanism is a crank slide block mechanism, a slide block of the crank slide block mechanism is connected with the lower end of the temperature sensor body, a slide rail matched with the slide block is arranged on the main body of the gas stove, and a crank of the crank slide block mechanism is used as an actuating part. The temperature sensor is simple in structure and reliable in transmission by adopting the lifting mechanism driven by the crank block.

Wherein, the outer surface of temperature sensor body is coated with thermochromic material to prevent scalding.

The invention also provides a gas stove, which comprises a burner and the embedded dry-burning prevention temperature sensor of the gas stove, wherein the fire cover of the burner is provided with a central through hole, and the embedded dry-burning prevention temperature sensor of the gas stove is arranged in the central through hole and can move up and down under the drive of the lifting mechanism.

(III) beneficial effects

According to the dry-heating-preventing temperature sensor for the embedded cooker, the lifting mechanism drives the temperature sensor body connected with the fixed support to move up and down, so that the stroke of the temperature sensor is increased, the lifting stroke of the temperature sensor body is controlled by the control system, the temperature sensor body is always in close contact with the pot bottoms in different pot bottom shapes (namely, the pot and the temperature sensor body form preset contact pressure), the detection precision is improved, and the phenomenon that the outer convex pot bottom is jacked up by the temperature sensor and the inner concave pot bottom cannot be contacted with the temperature sensor due to insufficient stroke of the traditional temperature sensor is avoided.

Drawings

Fig. 1 is a schematic view of a gas range in the prior art;

FIG. 2 is a schematic diagram of a prior art concave pan bottom with no contact to a temperature sensor;

fig. 3 is a schematic diagram of a structure in which an outer convex pan bottom is jacked up by a temperature sensor in the prior art;

FIG. 4 is a schematic view of a prior art temperature sensor tilted with respect to a pan bottom;

fig. 5 is a schematic view of a gas range according to the present invention in a state that a temperature sensor is protruded;

fig. 6 is a schematic view of a gas range according to the present invention in a state that a temperature sensor is not protruded;

FIG. 7 is a schematic view of a temperature sensor body of an embedded dry-fire resistant temperature sensor according to the present invention;

FIG. 8 is a schematic diagram of a limit switch of the control system of FIG. 7 being triggered;

FIG. 9 is a schematic diagram of a preferred embodiment of a lifting mechanism for an embedded anti-dry temperature sensor according to the present invention;

FIG. 10 is a schematic diagram of a control system of an embedded anti-dry-fire temperature sensor according to the present invention;

FIG. 11 is a schematic flow chart of a control mode 1 of an embedded dry-fire preventing temperature sensor according to the present invention;

FIG. 12 is a schematic flow chart of a control mode 2 of an embedded dry-fire preventing temperature sensor according to the present invention;

FIG. 13 is a schematic flow chart of a control mode 3 of an embedded dry-fire preventing temperature sensor according to the present invention;

FIG. 14 is a schematic flow chart of a control mode 4 of an embedded anti-dry-heating temperature sensor according to the present invention;

FIG. 15 is a schematic view of another preferred embodiment of a temperature sensor body of an embedded dry-fire resistant temperature sensor according to the present invention;

FIG. 16 is a schematic view of the limit switch of the control system of FIG. 10 being triggered;

FIG. 17 is a schematic view of another preferred embodiment of a lifting mechanism for an embedded anti-dry temperature sensor for a gas range according to the present invention;

fig. 18 is a schematic structural view of still another preferred embodiment of a lifting mechanism for an embedded dry-fire preventing temperature sensor for a gas range according to the present invention.

In the figure, 1: a panel; 2: a burner; 3: a pot holder; 4: a switch; 5: a fire cover; 6: a temperature sensor body; 61: an inner tube; 62: a heat shield; 63: a cover portion; 64: an elastic element; 65: a limit switch; 66: a limit rib; 67: a wire; 68: a sensitive block; 7: a lifting mechanism; 8: a pot; 9: a controller; 10: a thermocouple;

7A: a lifting mechanism; 7A-1: a fixed bracket; 7A-2: a threaded rod; 7A-3: a guide member; 7A-4: a motor; 7A-5: a support frame; 7A-6: a limit groove; 7A-7: a lateral projection; 7A-8: an upper connecting rod; 7A-9: a coupling; 7A-10: a nut;

7B: a lifting mechanism; 7B-1: a fixed bracket; 7B-2: a screw rod; 7B-3: a guide member; 7B-4: a motor; 7B-5: a support frame; 7B-6: a limit groove; 7B-7: a connection part; 7B-8: a second gear; 7B-9: a first gear;

7C: a lifting mechanism; 7C-1: a fixed bracket; 7C-2: a cam; 7C-3: a guide member; 7C-4: a motor; 7C-5: a support frame; 7C-6: a limit groove; 7C-7: a lateral projection; 7C-8: and a transverse chute.

Detailed Description

The following describes in further detail the embodiments of the present invention with reference to the drawings and examples. The following examples are illustrative of the invention and are not intended to limit the scope of the invention.

In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.

As shown in fig. 5, the gas cooker generally comprises a panel 1, a burner 2, a pot holder 3 and a switch 4, wherein the burner 2 corresponding to the cooker with the dry burning prevention function further comprises a fire cover 5 with a central through hole and a temperature sensor arranged in the central through hole of the fire cover 5. Wherein the fire cover 5 may be one or more turns (single or multiple). When the gas range is not in operation, the temperature sensor 6 can be lowered into the interior of the range via the central through hole of the fire cover 5, as shown in fig. 6. When the gas cooker works, the temperature sensor can be lifted out from the central through hole of the fire cover 5 and is contacted with the bottom of the cooker 8. As shown in fig. 6.

The invention provides an embedded dry-burning-preventing temperature sensor of a gas stove, which comprises a temperature sensor body 6, wherein the temperature sensor body 6 comprises a hollow inner pipe 61 and an outer end cover corresponding to the inner pipe 61, the outer end cover comprises a heat shield 62 and a cover part 63 connected with the heat shield 62, a thermosensitive element is arranged on the cover part 63, and an elastic element 64 is arranged between the outer end cover and the inner pipe 61. The temperature sensor also comprises a lifting mechanism 7 which is connected with the temperature sensor body 6 and used for driving the temperature sensor body 6 to lift. In addition, the temperature sensor further comprises a control system for controlling the ascending stroke of the temperature sensor body 6, so that the temperature sensor body 6 and the bottom of the cooker 8 form preset contact pressure, namely, the temperature sensor body 6 and the bottom of the cooker 8 with different bottom shapes can be always in close contact.

According to the temperature sensor, the temperature sensor body 6 is driven to move up and down through the lifting mechanism 7, so that the lifting amount of the temperature sensor body 6 is increased, the lifting stroke of the temperature sensor body 6 is controlled through the control system, the bottoms of the temperature sensor body 6 and cookers 8 with different bottom shapes can be in close contact all the time (namely, preset contact pressure is formed between the cookers 8 and the temperature sensor body 6), the detection precision is improved, and the phenomenon that the outer convex bottom of a pot is jacked up by the temperature sensor and the inner concave bottom of the pot cannot be contacted with the temperature sensor due to insufficient stroke of a traditional temperature sensor is avoided.

Example 1

Fig. 7 to 9 show a preferred embodiment of an embedded dry-fire preventing temperature sensor for a gas range according to the present invention. Wherein the temperature sensor body 6 includes an inner tube 61 and an outer end cap corresponding to the inner tube 61, the outer end cap including a heat shield 62 and a cover portion 63 connected to the heat shield 62, a heat sensitive element is provided on the cover portion 63, an elastic element 64 such as a spring is provided between the outer end cap and the inner tube 61, and a wire (not shown) connected to the heat sensitive element is provided inside the inner tube 61.

In this embodiment, the control system includes a controller 9 (preferably an MCU controller) and a judgment means for judging whether or not the compression amount of the elastic member 64 reaches a preset value, and when the judgment means judges that the compression amount of the elastic member 64 reaches the preset value, the controller 9 controls the lifting mechanism 7 to stop lifting. Specifically, the judging means includes a limit switch 65 provided on the inner tube 61, and when the elastic member 64 reaches a predetermined compression amount, the lower end of the heat shield 63 can touch the limit switch 65, and the limit switch 65 is connected to the controller 9 to control the lifting mechanism 7 to stop lifting by the controller 9. That is, when the lifting mechanism 7 drives the temperature sensor body 6 to lift, the limit switch 65 lifts together with the temperature sensor body 6, and when the temperature sensor body 6 touches the pot 8 during the lifting process, the outer end cover stops lifting, the inner tube 61 continues to lift, and the elastic element 64 is compressed. Along with the rising of the inner tube 61, the outer end cover 62 and the inner tube 61 slide relatively, when the compression amount of the elastic element 62 reaches a predetermined compression amount, the lower end of the outer end cover 62 triggers the limit switch 65 (as shown in fig. 8) to stop the lifting mechanism 7 from rising, so as to achieve that the contact pressure between the cooker 8 and the sensor body 6 is a predetermined value, thereby ensuring that the temperature sensor body 6 is tightly contacted with the bottom of the cooker 8.

As shown in fig. 9, the lifting mechanism 7A comprises a fixed bracket 7A-1 for fixing the temperature sensor body 6, a supporting frame 7A-5, a threaded rod 7A-2 and a transmission assembly, wherein the axis of the threaded rod 7A-2 is in a horizontal direction and is rotationally connected with the supporting frame 7A-5; the transmission assembly comprises a nut 7A-10 matched with the threaded rod 7A-2 and an upper connecting rod 7A-8, wherein two ends of the upper connecting rod 7A-8 are hinged with the fixed bracket 7A-1 and the nut 7A-10 respectively.

When the temperature sensor is used, the threaded rod 7A-2 is rotated positively or reversely, the rotation of the threaded rod 7A-2 drives the nut 7A-10 matched with the threaded rod 7A-2 to move leftwards or rightwards on the threaded rod 7A-2, the leftwards or rightwards movement of the nut 7A-10 drives the upper connecting rod 7A-8 to rotate relatively, the relative rotation of the upper connecting rod 7A-8 drives the fixed support 7A-1 to move up and down, so that the temperature sensor body 6 connected with the fixed support 7A-1 is driven to move up and down, and the lifting mechanism can drive the temperature sensor body 6 to move up and down, so that the stroke of the temperature sensor body 6 is enlarged, the bottoms of the temperature sensor body 6 and the cookware 8 can be always in tight contact, and the phenomena that the bottoms of the outer convex cookware 8 are jacked up by the temperature sensor and the bottoms of the inner concave cookware 8 cannot be contacted with the temperature sensor due to insufficient stroke of a traditional temperature sensor are avoided.

In this embodiment, the threaded rod 7A-2 comprises a first section and a second section connected to the first section, wherein the threads of the first section and the second section are reversed, the number of driving assemblies is two, and the nuts 7A-10 of the two driving assemblies cooperate with the first section and the second section of the threaded rod 7A-2, respectively. That is, one nut 7A-10 is provided at a first section of the threaded rod 7A-2, another nut 7A-10 is provided at a second section of the threaded rod 7A-2, each nut 7A-10 is hinged to one upper link 7A-8, and an upper end of each upper link 7A-8 is hinged to the fixed bracket 7A-1. The lengths of the two upper connecting rods 7A-8 are the same, and the hinge points of the upper ends of the two upper connecting rods 7A-8 are in the same horizontal direction and are spaced a certain distance.

According to the lifting mechanism, the two transmission assemblies are arranged to drive the fixed support 7A-1 to move up and down, so that the fixed support 7A-1 is prevented from tilting in the up-and-down movement process, and the temperature sensor body 6 connected with the fixed support 7A-1 can vertically move in the central through hole of the fire cover 5 of the gas stove, so that tilting and even blocking phenomena are avoided.

Wherein the fixed bracket 7A-1 comprises two bracket units which are arranged in a split manner. Each bracket unit is provided with a splicing surface facing the other bracket unit, and a fixing groove is concavely arranged on the splicing surface. The two fixing grooves of the two bracket units can be correspondingly spliced to form a fixing hole for the lower end of the temperature sensor body 6 to be matched and penetrated and fixed. When the temperature sensor body 6 is assembled to the fixing bracket, the lower end of the temperature sensor can be conveniently clamped and fixed by the splicing of the two fixing grooves, and the lifting mechanism can improve the assembly convenience between the temperature sensor body 6 and the fixing bracket 7A-1.

Preferably, each bracket unit is provided with a limiting groove 7A-6 in the fixing groove, and the limiting groove 7A-6 is used for accommodating the limiting rib 66 protruding at the lower end of the temperature sensor body 6 in an adapting mode. Typically, the limiting rib 66 is disposed at the lower end of the temperature sensor body 6 in a ring shape. The lifting mechanism can prevent the temperature sensor body 6 from generating downward displacement relative to the fixed bracket under the action of gravity through the limit fit of the limit groove 7A-6 and the limit rib 66, thereby improving the fixation stability of the temperature sensor body 6 on the fire cover 5 of the gas stove.

In another embodiment of the present invention, the transmission assembly further comprises a lower link, wherein the upper end of the lower link is hinged with the nut 7A-10, the lower end of the lower link is hinged with the gas stove, and the hinge points at both ends of the lower link and the hinge points at both ends of the upper link 7A-8 of the transmission assembly are symmetrically arranged about the axis of the threaded rod 7A-2. The lifting mechanism of the invention prevents the nut 7A-10 from tilting when moving left and right on the threaded rod 7A-2 by arranging the lower connecting rod, thereby avoiding the increase of resistance.

Further, in order to ensure that the temperature sensor body 6 moves vertically in the central through hole of the fire cover 5 of the gas stove, tilting is avoided, the lifting mechanism further comprises a guiding mechanism for guiding the fixing support 7A-1, so that the temperature sensor body 6 is automatically aligned in the retracting and extending processes, and the phenomenon that the temperature sensor body 6 tilts and is not attractive is avoided.

In this embodiment, the guiding mechanism comprises a guiding piece 7A-3, in particular a guiding rod, arranged on the gas stove, a through hole which is in sliding connection with the guiding piece 7A-3 is arranged on the fixing support 7A-1, and the fixing support 7A-1 is sleeved on the guiding rod through the through hole. Preferably, for convenience of processing, the fixing bracket 7A-1 is provided with a transverse protrusion 7A-7, and a through hole slidably connected with the guide 7A-3 is provided on the transverse protrusion 7A-7 to reduce processing difficulty.

It should be noted that, in other embodiments of the present invention, two lateral protrusions 7A-7 may be disposed on the fixed support 7A-1 side by side, and each lateral protrusion 7A-7 may be provided with a through hole slidably connected to the guide 7A-3, so as to further ensure the movement direction of the fixed support 7A-1. In addition, other types of guide mechanisms may be employed. For example, a slide rail is provided on the gas range, and a slider that cooperates with the slide rail is provided on the fixing bracket 7A-1.

Furthermore, in order to prevent the threaded rod 7A-2 from jumping during rotation, it is preferable that the free end of the threaded rod 7A-2 is rotatably connected to the guide 7A-3, i.e., a hole rotatably connected to the threaded rod 7A-2 is provided at the lower portion of the guide 7A-3, and the threaded rod 7A-2 is rotatably connected to the hole of the guide 7A-3 through a bearing.

Further, the rotation of the threaded rod 7A-2 is driven by a motor 7A-4, which motor 7A-4 is mounted on the support frame to save labor. Preferably, the motor 7A-4 is coupled to the threaded rod 7A-2 via a coupling 7A-9.

The surface of the temperature sensor body 6 is preferably coated with a thermochromic material to indicate the temperature of the surface of the temperature sensor body through a color change, preventing an operator from being scalded when pressing the temperature sensor body 6.

The invention also provides a control method of the embedded dry-burning prevention temperature sensor, which comprises the following steps:

step S1: judging whether the lifting mechanism 7 needs to be lifted; if the lifting is needed, entering a step S2;

step S2: driving the lifting mechanism 7 to lift so as to drive the temperature sensor body 6 to lift;

step S3: judging whether the temperature sensor body 6 is contacted with the bottom of the pot 8 or not, and stopping the lifting mechanism 7 from lifting if the temperature sensor body is contacted with the bottom of the pot 8;

step S4: judging whether the lifting mechanism 7 needs to descend, and when the lifting mechanism 7 needs to descend, driving the lifting mechanism 7 to descend so as to drive the temperature sensor body 6 to descend into the combustor.

According to the control method of the embedded dry-heating-preventing temperature sensor, the lifting mechanism 7 is controlled to drive the temperature sensor body 6 to move up and down, so that the lifting amount of the temperature sensor body 6 is increased, and the lifting stroke of the temperature sensor body 6 is controlled by the control system, so that the temperature sensor body 6 and the bottoms of the cookers 8 with different bottom shapes can be tightly contacted all the time (namely, preset contact pressure is formed between the cookers 8 and the temperature sensor body 6), the detection precision is improved, and the phenomenon that the outer convex bottom of a pot is jacked up by the temperature sensor and the inner concave bottom of the pot cannot be contacted with the temperature sensor due to insufficient stroke of the traditional temperature sensor is avoided.

In step S3 of the control method provided by the present invention, the manner of determining whether the temperature sensor body 6 contacts the bottom of the pot 8 is: judging whether the contact pressure formed between the temperature sensor body 6 and the bottom of the cooker 8 is greater than or equal to the preset pressure, if so, considering that the temperature sensor body 6 is contacted with the bottom of the cooker 8, otherwise, not contacting. According to the control method provided by the invention, whether the temperature sensor body 6 is in contact with the bottom of the cooker 8 is judged through the contact pressure formed between the temperature sensor body 6 and the bottom of the cooker 8, so that the rising and falling amount of the temperature sensor is controlled, the predetermined contact pressure is formed for the cookers 8 with different bottom shapes, the close contact between the temperature sensor and the bottom of the cooker is ensured, and the detection precision is further improved.

Preferably, the mode of judging whether the contact pressure formed between the temperature sensor body 6 and the bottom of the pan 8 is greater than or equal to the preset pressure is as follows: whether the compression amount of the elastic element of the temperature sensor body 6 reaches a preset value is judged, and if the compression amount reaches the preset value, the contact pressure is considered to be greater than or equal to the preset pressure. Preferably, the manner of determining that the compression amount of the elastic element 64 of the temperature sensor body 6 reaches the preset value is as follows: when the outer end cap of the temperature sensor body 6 activates the limit switch 65. That is, when the temperature sensor body 6 touches the bottom of the pot 8, the elastic element 64 connected with the temperature sensor body 6 is compressed, and reaches a predetermined compression amount, the limit switch 65 is triggered to stop the lifting mechanism 7, so as to ensure that the contact pressure between the pot 8 and the temperature sensor body 6 is a preset value, that is, ensure that the temperature sensor is tightly contacted with the bottom of the pot 8.

Preferably, the controller 9 is connected to the thermocouple 10 of the gas range, and as shown in fig. 10, in step S1, the first mode for determining whether the lifting mechanism 7 needs to be lifted is: the controller 9 receives a thermoelectric signal generated by the thermocouple 10 of the gas range, and if the thermoelectric signal is received, it sends an up command to the lifting mechanism 7, otherwise, it does not send a command. Specifically, as shown in fig. 11, it includes the following sub-steps:

s11: after a user sits on the pan and fires, the thermocouple 10 is heated to generate thermoelectric force;

s12: the controller 9 receives the thermoelectric signal from the thermocouple 10;

s13: the controller 9 sends an ascending instruction to the elevating mechanism 7 to drive the elevating mechanism 7 to ascend.

Preferably, the controller 9 is connected to the temperature sensor body 6. Also included between steps S12 and S13 is the controller 9 receiving a temperature signal from the temperature sensor body 6 detected, if the temperature reaches a preset value, then sending a rise command to the lifting mechanism 7, otherwise not sending a command (as shown in fig. 12). The control method provided by the invention judges whether the lifting mechanism 7 is driven to rise by detecting whether the temperature signal detected by the temperature sensor body reaches the preset value, so as to avoid the temperature sensor body 6 from rising by mistake when a user does not sit in the pan and fires.

Preferably, as shown in fig. 13, a judgment is further included between steps S12 and S13 as to whether the controller receives the thermoelectric force signal from the thermocouple 10 for a preset time, if the thermoelectric force signal is maintained for the preset time, a raising instruction is sent to the lifting mechanism 7, otherwise, no instruction is sent. According to the control method provided by the invention, the lifting mechanism 7 is driven to lift only when the thermoelectric voltage signal is maintained for the preset time, so that the temperature sensor body is prevented from lifting mistakenly when a user is not sitting in the pan and is started.

Further, before step S13, a step of detecting whether the limit switch is triggered by the outer end cover is further included, if the limit switch 65 is triggered, a raising instruction is not sent to the lifting mechanism 7, and if the limit switch 65 is not triggered, a raising instruction is sent to the lifting mechanism 7.

Preferably, as shown in fig. 14, in step S4, the manner of determining whether the lifting mechanism 7 needs to be lowered is:

s41, the controller 9 receives the disappearance of the thermoelectric voltage signal of the thermocouple 10;

s42, judging whether the lifting mechanism 7 is at an initial position; if not, the process proceeds to step S43, and if the elevating mechanism 7 is located at the initial position, no lowering instruction is sent to the elevating mechanism 7,

s43: the lifting mechanism 7 is controlled to descend to the initial position.

Preferably, the control method controls the descent position of the temperature sensor through a preset initial position. Specifically, the number of pulses received by the motor is recorded when the temperature sensor rises, and the recorded number of pulses is transmitted to the motor when the temperature sensor falls, so that the temperature sensor falls to the initial position.

Example 2

This embodiment is substantially the same as embodiment 1, and for brevity of description, in the description of this embodiment, the same technical features as embodiment 1 will not be described, and only the differences between this embodiment and embodiment 1 will be described.

As shown in fig. 15 and 16, the judging means includes a limit switch 65 provided on the inner tube 61, a sensitive block 68 provided on the lead 67, and when the elastic member 64 reaches a predetermined compression amount, the sensitive block 68 on the lead 67 corresponds to the limit switch 68 and activates the limit switch 68. That is, when the lifting mechanism 7 drives the temperature sensor body 6 to lift, the limit switch 68 lifts together with the temperature sensor body 6, and when the temperature sensor body 6 touches the pot 8 during the lifting process, the outer end cover stops lifting, the inner tube 61 continues to lift, and the elastic element 64 is compressed. As the inner tube 61 is raised, the guide wire 67 slides relatively in the inner tube 61. When the relative sliding reaches the preset value, the sensitive block 68 fixed on the lead 67 corresponds to the limit switch 65 (as shown in fig. 16), so as to trigger the limit switch 65 to stop the lifting mechanism 7B from lifting, and the compression amount of the elastic element 64 reaches the preset value at this time, so as to achieve that the contact pressure between the cooker 8 and the sensor body 6 is a certain value, thereby ensuring that the temperature sensor body 6 is tightly contacted with the bottom of the cooker 8.

It should be noted that, as will be understood by those skilled in the art, whether the compression amount of the elastic element 64 of the temperature sensor body 6 reaches the preset value may be determined in other manners, for example, by directly detecting the compression amount of the elastic element 64 through an infrared sensor.

As shown in fig. 17, the lifting mechanism 7B comprises a fixed bracket 7B-1 for fixing the temperature sensor body 6, a supporting frame 7B-5 and a screw rod 7B-2, wherein the axis of the screw rod 7B-2 is in a vertical direction and is rotationally connected with the supporting frame 7B-5; the fixing bracket 7B-1 comprises a fixing bracket body, wherein a transverse protruding part 7B-7 is arranged on the fixing bracket body, and the transverse protruding part 7B-7 is provided with an internal thread matched with the screw rod 7B-2.

When the temperature sensor is used, the screw rod 7B-2 is rotated, the fixed support 7B-1 matched with the screw rod 7B-2 is driven to move up and down by the rotation of the screw rod 7B-2, so that the temperature sensor body 6 connected with the fixed support 7B-1 is driven to move up and down, and therefore, the lifting mechanism can drive the temperature sensor body 6 to move up and down, the stroke of the temperature sensor body 6 is enlarged, the bottoms of the temperature sensor body 6 and the cookware 8 can be tightly contacted all the time, and the phenomenon that the bottoms of the outer convex cookware 8 are jacked up by the temperature sensor and the bottoms of the inner concave cookware 8 cannot be contacted with the temperature sensor due to insufficient stroke of a traditional temperature sensor is avoided.

Specifically, the lifting mechanism further comprises a motor 7B-4 for driving the screw rod 7B-2 to rotate, so that the screw rod 7B-2 rotates under the drive of the motor 7B-4, thereby saving manpower.

Preferably, the supporting frame 7B-5 is of a U-shaped structure, and two ends of the screw rod 7B-2 are respectively and rotatably connected with two free ends of the supporting frame 7B-5, so that the lifting mechanism is simple in structure. In this case, the motor 7B-4 is preferably fixed inside the U-shaped structure so that the lifting mechanism is compact and occupies a small space.

In addition, the lifting mechanism further comprises a gear transmission assembly, wherein the gear transmission assembly comprises a first gear 7B-9 and a second gear 7B-8 which are meshed with each other, a gear shaft of the first gear 7B-9 is connected with an output shaft of the motor 7B-4, and a gear shaft of the second gear 7B-8 is connected with the screw rod 7B-2.

When the screw rod 7B-2 is used, the motor 7B-4 drives the gear shaft of the first gear 7B-9 to rotate, and the gear shaft of the second gear 7B-8 is driven to rotate through the meshing of the first gear 7B-9 and the second gear 7B-8, so that the screw rod 7B-2 is driven to rotate by the rotation of the gear shaft of the second gear 7B-8, and then the fixed support 7B-1 matched with the screw rod 7B-2 is driven to move up and down. The lifting mechanism according to the present invention further improves the controllability of the up-and-down movement of the fixed bracket 7B-1 by providing a gear transmission assembly between the motor 7B-4 and the screw rod 7B-2.

Similar to embodiment 1, the elevating mechanism is also provided with a guide 7B-3 for guiding the fixed bracket 7B-1; in addition, the fixing bracket 7B-1 also comprises two bracket units which are arranged in a split mode, and each bracket unit is provided with a limiting groove 7B-6 in the fixing groove.

In the control method of the embedded dry-heating preventing temperature sensor, the mode of judging that the compression amount of the elastic element 64 of the temperature sensor body reaches a preset value is as follows: the sensitive block 68 on the wire 67 corresponds to the limit switch 65 when the limit switch 65 is triggered. That is, when the temperature sensor body 6 touches the bottom of the pot 8, the elastic element 64 connected with the temperature sensor body 6 is compressed, and reaches a preset compression amount, the limit switch 65 is triggered to stop the lifting mechanism, so as to ensure that the contact pressure between the pot 8 and the temperature sensor body 6 is a preset value, that is, the temperature sensor is tightly contacted with the bottom of the pot 8.

Example 3

As shown in fig. 18, the lifting mechanism 7C includes a fixing bracket 7C-1 for fixing the temperature sensor body 6, a cam 7C-2, and a supporting frame 7C-5 for supporting the cam 7C-2, the fixing bracket 7C-1 includes a fixing bracket body, one side of the fixing bracket body is provided with a transverse chute 7C-8, and a free end of the cam 7C-2 is slidably connected with the transverse chute 7C-8.

When the temperature sensor is used, the cam 7C-2 is rotated, the fixed support 7C-1 matched with the cam 7C-2 is driven to move up and down by the rotation of the cam 7C-2, so that the temperature sensor body 6 connected with the fixed support 7C-1 is driven to move up and down, and therefore, the lifting mechanism can drive the temperature sensor body 6 to move up and down, the stroke of the temperature sensor body 6 is enlarged, the bottoms of the temperature sensor body 6 and the cookware 8 can be tightly contacted all the time, and the phenomenon that the bottoms of the outer convex cookware 8 are jacked up by the temperature sensor and the bottoms of the inner concave cookware 8 cannot be contacted with the temperature sensor due to insufficient stroke of a traditional temperature sensor is avoided.

In this embodiment, the free end of the cam 7C-2 is provided with a sliding block in sliding engagement with the transverse chute 7C-8, and the sliding block is detachably connected to the cam 7C-2 for easy manufacture.

In this embodiment, the rotation of the cam 7C-2 is driven by a motor 7C-2, and the motor 7C-4 is mounted on the support frame 7C-5 to save labor.

In this embodiment, a guide 7C-3 for guiding the fixing bracket 7C-1 is also provided, a lateral projection 7C-7 is provided on the fixing bracket 7C-1, and a through hole for fitting the guide 7C-3 is provided on the lateral projection 7C-7. In addition, the structure of the fixing bracket 7C-1 is the same as that of the embodiment 1, namely, the fixing bracket comprises two bracket units which are arranged in a split mode, and each bracket unit is provided with a limiting groove 7C-6 in the fixing groove.

In this embodiment, the control system includes a controller connected to the motor 7C-2, which controls the ascending stroke of the elevating mechanism 7 according to whether or not the output torque of the motor 7C-2 reaches a predetermined value. Specifically, the temperature sensor body 6 touches the bottom of the pot 8 in the rising process, and when the output torque of the motor 7C-2 reaches a preset value, the controller controls the motor to stop rotating, so that the lifting mechanism 7 stops rising, the contact pressure between the pot 8 and the sensor 6 is a certain value, and the close contact between the temperature sensor body 6 and the bottom of the pot 8 is ensured.

In the control method of the embedded dry-heating preventing temperature sensor, when the lifting mechanism 7 is driven by the motor 7C-2, and when the output torque of the motor 7C-2 reaches a preset value, the contact pressure formed between the temperature sensor body 6 and the bottom of the cooker 8 is judged to be greater than or equal to the preset pressure. Namely, the mode of judging whether the contact pressure formed between the temperature sensor body 6 and the bottom of the cooker 8 is more than or equal to the preset pressure is as follows: judging whether the output torque of the motor 7C-2 reaches a preset value, and if so, considering that the contact pressure formed between the temperature sensor body 6 and the bottom of the cooker 8 is greater than or equal to the preset pressure. Specifically, when the temperature sensor body 6 touches the bottom of the pan 8 in the rising process, the motor 7C-2 senses the change of the output torque, and when the torque reaches a preset value, the motor 7C-2 stops rotating to achieve that the contact pressure between the pan 8 and the sensor 6 is a certain value, so that the temperature sensor body 6 is tightly contacted with the bottom of the pan 8. The control method according to the invention is simple and reliable and has high control accuracy by adopting the output torque of the motor as a judging condition.

Example 4

The lifting mechanism is a crank slide block mechanism, a slide block of the crank slide block mechanism is connected with the lower end of the temperature sensor body 6, specifically, is connected with an inner tube 61 of the temperature sensor body 6, and a slide rail matched with the slide block is arranged on the main body of the gas stove, wherein a crank of the crank slide block mechanism is used as an actuating part.

During the use, drive the slider up-and-down motion of being connected with the crank through the crank rotation, and then drive the temperature sensor body 6 up-and-down motion of being connected with the slider to increase the stroke of temperature sensor body 6, thereby make temperature sensor body 6 and pan 8 bottom contact closely all the time, avoided traditional temperature sensor because of the phenomenon that temperature sensor jack-up, indent pan 8 bottom contact temperature sensor not be reached to the evagination pan 8 bottom that the stroke caused.

The invention also provides a gas stove which comprises the burner 2 and the embedded dry-burning prevention temperature sensor of the gas stove, wherein the fire cover of the burner is provided with a central through hole, and the embedded dry-burning prevention temperature sensor of the gas stove is arranged in the central through hole and can move up and down under the drive of the lifting mechanism. Because the gas stove adopts all the technical schemes of all the embodiments, the gas stove at least has all the beneficial effects brought by the technical schemes of the embodiments, and the description is omitted here.

The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.

Claims

1. The embedded dry-heating preventing temperature sensor of the gas stove is characterized by comprising a temperature sensor body, a lifting mechanism connected with the temperature sensor body and used for driving the temperature sensor body to lift, and a control system used for controlling the lifting stroke of the temperature sensor body, so that the temperature sensor body can be in contact with the bottom of a pot; the temperature sensor body and the bottom of the cooker form preset contact pressure;

the temperature sensor body comprises an inner pipe and an outer end cover corresponding to the inner pipe, the outer end cover comprises a heat shield and a cover part connected with the heat shield, and an elastic element is arranged between the outer end cover and the inner pipe; the control system comprises a controller and a judging device for judging whether the compression amount of the elastic element reaches a preset value, wherein the preset contact pressure is the preset value; the judging device comprises a limit switch arranged on the inner tube, when the elastic element reaches a preset compression amount, the lower end of the heat shield can touch the limit switch, the limit switch is connected with the controller, and the controller controls the lifting mechanism to stop lifting.

2. The gas range embedded dry-fire preventing temperature sensor according to claim 1, wherein a heat sensitive element is provided on the cover portion, and a wire connected to the heat sensitive element is provided in the inner tube.

3. The gas cooker embedded dry-heating preventing temperature sensor according to claim 2, wherein a sensitive block is arranged on the wire, and when the elastic element reaches a preset compression amount, the sensitive block on the wire can touch the limit switch, and the limit switch is connected with the controller.

4. The gas cooker embedded dry-fire preventing temperature sensor according to claim 2, further comprising a motor for driving the lifting mechanism, wherein the control system comprises a controller connected with the motor, and the controller controls the lifting stroke of the lifting mechanism according to whether the output torque of the motor reaches a preset value.

5. The gas cooker embedded dry-burning prevention temperature sensor according to claim 2, wherein the cover portion is provided with an outer eave, and the diameter of the outer eave is larger than the outer diameter of the heat shield.

6. The gas cooker embedded dry-fire preventing temperature sensor according to claim 5, wherein the diameter of the outer eave is smaller than the central through hole of the burner of the gas cooker.

7. The embedded dry-burning prevention temperature sensor of a gas stove according to claim 1, wherein the lifting mechanism comprises a fixed bracket for fixing the temperature sensor body, a support frame, a transmission assembly and a threaded rod, wherein the axis of the threaded rod is in a horizontal direction and is rotationally connected with the support frame; the transmission assembly comprises a nut and an upper connecting rod which are matched with the threaded rod, and two ends of the upper connecting rod are respectively hinged with the fixed support and the nut.

8. The embedded dry combustion method preventing temperature sensor of a gas stove according to claim 1, wherein the lifting mechanism comprises a fixed bracket for fixing the temperature sensor body, a support frame and a screw rod, the axis of the screw rod is in a vertical direction, the screw rod is rotationally connected with the support frame, the fixed bracket comprises a fixed bracket body, a connecting part is arranged on the fixed bracket, and an internal thread matched with the screw rod is arranged on the connecting part.

9. The gas cooker embedded dry-burning prevention temperature sensor according to claim 1, wherein the lifting mechanism comprises a fixed bracket for fixing the temperature sensor body, a cam and a supporting frame for supporting the cam, the fixed bracket comprises a fixed bracket body, a transverse chute is arranged on one side of the fixed bracket body, and the free end of the cam is in sliding connection with the transverse chute.

10. The embedded dry-burning prevention temperature sensor of a gas stove according to claim 1, wherein the lifting mechanism is a crank slider mechanism, a slider of the crank slider mechanism is connected with the lower end of the temperature sensor body, and a sliding rail matched with the slider is arranged on the main body of the gas stove.

11. The gas cooker embedded dry-fire preventing temperature sensor according to any one of claims 1 to 10, wherein an outer surface of the temperature sensor body is coated with a thermochromic material.

12. A gas stove, characterized by comprising a burner and an embedded dry-burning prevention temperature sensor of the gas stove according to any one of claims 1-11, wherein a central through hole is arranged on a fire cover of the burner, and the embedded dry-burning prevention temperature sensor of the gas stove is arranged in the central through hole and can move up and down under the drive of a lifting mechanism.