JP2019002665A - Gas cooking stove - Google Patents

Abstract

To detect erroneous setting of a burner head with a phase different from a normal phase without being affected by boiling-over, in a gas cooking stove including a stove burner which includes the burner head 23 disposed on a burner body 22, and in which a number of tooth portions 232 sitting on a body flange portion 223 of an outer periphery of an upper end portion of the burner body are suspended to a lower face outer peripheral portion of the burner head, and flame holes 233 are formed by clearances among the tooth portions.SOLUTION: A temperature detector 6 composed of an infrared ray sensor and the like detecting a temperature of a body flange portion 223 is disposed under the body flange portion 223. In a case where a burner head 23 is erroneously set, the burner head 23 floats, an air fuel mixture is jetted even from a clearance between lower ends of tooth portions 232 and the body flange portion 223, flame is formed in a manner of being kept into contact with the body flange portion 223, the temperature of the body flange portion 223 is increased to be higher than that at a normal time, and the temperature detector 6 detects the temperature.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a gas stove provided with a stove burner.

  Generally, a stove burner includes a burner body and a burner head mounted on the burner body, and a body flange that projects radially outward from the outer periphery of the upper end of the burner body on the outer periphery of the lower surface of the burner head. A large number of tooth portions seated on the portion are suspended at intervals in the circumferential direction, and a flame port is formed through which air-fuel mixture is ejected in the gaps between the tooth portions.

  By the way, the burner head needs to be mounted on the burner body at a predetermined normal phase so that a radially outwardly projecting target portion provided at one location is opposed to an upper side of an ignition electrode attached to the stove burner. There is. For this reason, generally, the burner body and the burner head are formed with a concave portion and a convex portion that fit when the burner head is placed in a normal phase (see, for example, Patent Document 1). According to this, when the burner head is in an erroneous setting state in which the burner head is not placed in the normal phase, the convex portion does not fit into the concave portion, so that the burner head floats and the burner head is in the erroneous setting state. Can be visually recognized. However, some users do not think it is abnormal even if the burner head is floating.

  Therefore, conventionally, according to Patent Document 2, there is provided a burner head detection means for detecting when the burner head is placed on the burner body in the normal phase, and when this detection means is not detected, that is, an error of the burner head. It is known that the stove burner is incombustible when set. In this case, the burner head detection means uses the detection piece provided on the burner head and the position of the detection piece when the burner head is mounted at the normal phase as a reference position. And a detector for detecting. However, in the one described in Patent Document 2, boiled juice may be applied to the detector. As a result, the detector may not be able to properly determine whether or not the burner head has been placed in the normal phase because the detector is not functioning properly due to the dirt from the spilled juice sticking to the detector.

JP-A-6-185707 JP 2006-29612 A

  This invention makes it the subject to provide the gas stove which enabled it to detect the incorrect set of a burner head, without receiving the influence of spilling in view of the above point.

  In order to solve the above problems, the present invention is a gas stove comprising a stove burner, the stove burner comprising a burner body and a burner head mounted on the burner body, the outer peripheral portion of the lower surface of the burner head In addition, a large number of tooth portions seated on the body flange portion extending outward in the radial direction on the outer periphery of the upper end portion of the burner body are provided at intervals in the circumferential direction, and the air-fuel mixture is ejected in the gaps between the tooth portions. What constitutes a flame mouth is characterized in that a temperature detector for detecting the temperature of the body flange portion is disposed at least under one place in the circumferential direction of the body flange portion.

  Here, when the burner head is set incorrectly, the burner head floats and the tooth portion does not sit on the body flange portion. The air-fuel mixture is also ejected from the gap between the lower end of the tooth portion and the body flange portion, and a flame is formed so as to be in contact with the body flange portion. Therefore, assuming that the burner head is placed on the burner body in a predetermined normal phase, the temperature of the body flange is set in a state in which the burner head is set incorrectly compared to when burning in the normal state. Higher temperature during combustion. Therefore, according to the present invention, an erroneous setting of the burner head can be detected based on the temperature of the body flange portion detected by the temperature detector.

  For example, the burner head is erroneously set when the detected temperature of the temperature detecting means is equal to or higher than a predetermined first threshold value that is higher than the upper limit of the temperature range detected by the temperature detector during combustion in the normal state. It can be judged. Then, when the temperature detected by the temperature detector becomes equal to or higher than the first threshold, the gas supply to the stove burner is stopped, so that the fail-safe when the burner head is set incorrectly can be achieved.

  Furthermore, in this invention, since the temperature detector is arrange | positioned under the body flange part, the boiled juice does not apply to a temperature detector. Accordingly, it is possible to prevent the erroneous setting of the burner head from being detected due to the boiling.

  Further, in the present invention, a protruding portion that protrudes upward is provided at a portion of the body flange portion that is located radially outward of a portion where a predetermined tooth portion is seated in a normal state, and a temperature is provided below the protruding portion. It is desirable to have a detector. According to this, when the burner head is set incorrectly, one of the flame outlets is shifted to a position facing the projection, and the projection is strongly heated by the flame formed in the flame outlet. Even if any tooth part exists at a position opposite to the protrusion part is strongly heated by the flame formed by the combustion of the air-fuel mixture ejected from the gap between the lower end of the tooth part and the body flange part, The temperature of the protrusion rises quickly. For this reason, the temperature detected by the temperature detector rises quickly, and an erroneous setting of the burner head can be detected with good responsiveness.

  In the present invention, the temperature detector is preferably composed of an infrared sensor that detects infrared rays emitted from the lower surface of the body flange portion. According to this, there is no need for the temperature detector to be in close contact with the body flange portion, and even if the mounting position of the temperature detector varies slightly in the vertical direction, the temperature detection accuracy of the body flange portion does not deteriorate and the reliability is improved. improves.

  By the way, when a flame lifts or misfires, the temperature of a body flange part will fall. Therefore, in the present invention, the temperature range detected by the temperature detector during combustion in a normal state after the elapse of a predetermined waiting time from ignition, in the normal state after the elapse of the predetermined waiting time from ignition. It is desirable to stop the gas supply to the stove burner when it becomes below a predetermined second threshold value set lower than the lower limit. According to this, it is possible to cope with flame lift and misfire without attaching a flame detection element facing the flame opening to the burner.

The perspective view of the principal part of the gas stove of 1st Embodiment of this invention. The cutaway side view of the principal part of the gas stove of 1st Embodiment. (A) (b) Explanatory drawing which shows the state at the time of the normal combustion of the main part of the stove burner comprised to the gas stove of embodiment, and a burner head mis-set. The graph which shows the change of the detection temperature of the temperature detector at the time of the normal combustion of the stove burner with which the gas stove of embodiment is equipped, and a burner head mis-setting. The flowchart which shows the content of the safety control performed with the gas stove of embodiment. The perspective view of the principal part of the gas stove of 2nd Embodiment. The cut side view of the principal part of the gas stove of 2nd Embodiment.

  1 and 2, the gas stove according to the embodiment of the present invention is a stove burner exposed on the top plate 1 through a burner opening 11 provided in the top plate 1 covering the upper surface of a stove body (not shown). 2 and the five virtues 3 placed on the top board 1 so as to surround the stove burner 2. A burner ring 12 is mounted on the top plate 1 to cover the gap between the burner opening 11 and the stove burner 2 from above. The stove burner 2 has an ignition electrode 4 projecting upward through the burner ring 12 and a pan bottom temperature projecting upward through the burner central space and contacting the bottom surface of the cooking container placed on the virtues 3 to detect its temperature. A sensor 5 is attached.

  The five virtues 3 are composed of an annular five virtue frame 31 that surrounds the burner ring 12 and a plurality of five virtue claws 32 that are radially attached to the five virtue frame 31. The two predetermined virtue claws 32 are provided with extending portions 321 extending radially inward from the fixing portion with respect to the virtue frame 31. And the extension part 321 of the two virtuosity claw 32 is engaged with the notch part 121 formed in two places of the outer periphery of the burner ring 12, and the virtues 3 are prevented from rotating at a predetermined phase.

  The stove burner 2 includes a burner body 22 that extends upward from the downstream end of the mixing tube 21 and is inserted into the burner opening 11, and a burner head 23 that is placed on the burner body 22. The burner body 22 is made of a hollow annular sheet metal that has an inner cylinder 221 and an outer cylinder 222 and opens upward. The burner body 22 is placed and fixed on a base frame (not shown) fixed in the stove body. A body flange portion 223 projecting radially outward and a skirt portion 224 extending downward from the outer periphery of the body flange portion 223 are formed on the outer periphery of the upper end portion of the burner body 22, that is, the upper end of the outer cylinder 222. .

  The burner head 23 is annular and has a seal cylinder portion 231 that extends downward from the inner peripheral edge and fits into the inner cylinder 221 of the burner body 22. A large number of tooth portions 232 that are seated on the body flange portion 223 are provided on the outer peripheral portion of the lower surface of the burner head 23 at intervals in the circumferential direction, and air-fuel mixture is ejected through the gaps between the tooth portions 232 and 232. A flame outlet 233 is configured. A groove is formed on the lower end surface of each tooth portion 232, and a flame holding port 234 that is extremely smaller than the flame port 233 is formed by the groove. Further, a target portion 235 that protrudes radially outward is provided at one location around the burner head 23 so as to face the upper side of the ignition electrode 4.

  Furthermore, although not shown in the drawing, a recess and a protrusion that fit into the burner body 22 and the burner head 23 when the burner head 23 is placed on the burner body 22 in a normal phase where the target portion 235 faces above the ignition electrode 4. And are provided. If the burner head 23 is in a normal phase, the tooth portion 232 is located in the same direction as the virgin claw 32, and the flame port 233 does not exist at this position. Therefore, the flame formed at the flame outlet 233 does not touch the five virtue claws 32 and does not burn incompletely. The flame formed in the flame holding port 234 at the lower end of the tooth portion 232 is extremely small and does not touch the virtuosity claw 32.

  If the burner head 23 is in an erroneously set state where it is not placed on the burner body 22 in the normal phase, the convex part does not fit into the concave part, so that the burner head 23 floats and the burner head 23 is in an erroneously set state. Can be recognized. However, some users do not think that it is abnormal even if the burner head 23 is floating.

  Therefore, in the present embodiment, a temperature detector 6 that detects the temperature of the body flange portion 223 is disposed under one place in the circumferential direction of the body flange portion 223, as shown in FIGS. The temperature detector 6 is composed of an infrared sensor in which an infrared detection element 62 is mounted in a cylindrical sensor case 61. The temperature detector 6 detects infrared rays radiated from the lower surface of the body flange portion 223 to detect the body flange portion 223. Detect the temperature.

  When the burner head 23 is placed on the burner body 22 in the normal phase, the flame formed in the flame outlet 233 during combustion in the normal state is the body flange as shown in FIG. It moves away from the part 223 upward. Therefore, the temperature of the body flange portion 223 is not so high, and the temperature detected by the temperature detector 6 is as indicated by line a in FIG. On the other hand, when the burner head 23 floats from the burner body 22 in an erroneous setting state, a relatively large amount of air-fuel mixture is ejected from the gap between the lower end surface of the tooth portion 232 and the body flange portion 223, and FIG. A flame is formed so as to contact the body flange portion 223 as shown in FIG. Therefore, the temperature of the body flange portion 223 is increased, and the detected temperature of the temperature detector 6 is as indicated by line b in FIG.

  Utilizing the above phenomenon, in this embodiment, the safety control shown in FIG. 5 is performed by the controller of the gas stove. In this safety control, first, in STEP 1, it is determined whether or not the detected temperature T of the temperature detector 6 has become equal to or higher than the first threshold value YT 1. Referring to FIG. 4, first threshold value YT1 is set to a predetermined temperature higher than the upper limit of the temperature range detected by temperature detector 6 during combustion in the normal state. If T <YT1, the process proceeds to STEP 2 to determine whether or not a predetermined waiting time t1 has elapsed since ignition. Before the waiting time t1 elapses, the process returns to STEP1, and when the waiting time t1 elapses, the process proceeds to STEP3 to determine whether or not the detected temperature T of the temperature detector 6 is equal to or lower than the second threshold YT2. Referring to FIG. 4, second threshold value YT2 is set to a predetermined temperature lower than the lower limit of the temperature range detected by temperature detector 6 during combustion in a normal state after waiting time t1 has elapsed since ignition. If T> YT2, the process returns to STEP1 repeatedly.

  When it is determined in STEP 1 that T ≧ YT 1, the process proceeds to STEP 4 where the safety valve provided in the gas supply path to the stove burner 2 is closed and the gas supply to the stove burner 2 is stopped. T ≧ YT1 is when the burner head 23 is set incorrectly. In this case, by stopping the gas supply, fail-safe when the burner head 23 is erroneously set can be achieved.

  Further, when it is determined in STEP 3 that T ≦ YT2, the process proceeds to STEP 4 and the gas supply to the burner 2 is stopped. T ≦ YT2 is when a flame lift or misfire occurs. In this case, by stopping the gas supply, it is possible to cope with flame lift and misfire without attaching a flame detection element facing the flame port 233 to the burner 2.

  Furthermore, in the present embodiment, since the temperature detector 6 is disposed under the body flange portion 223, the simmered juice is not applied to the temperature detector 6. Accordingly, it is possible to prevent the erroneous setting of the burner head 23 from being detected due to the boiling.

  Next, a second embodiment shown in FIGS. 6 and 7 will be described. The basic structure of the second embodiment is not particularly different from that of the first embodiment, and the same members and parts as those of the first embodiment are denoted by the same reference numerals. The differences of the second embodiment from the first embodiment are as follows. That is, the body flange portion 223 has a radially outward protruding amount larger than that of the first embodiment, and is a body flange positioned on the radially outer side of a portion where the predetermined tooth portion 232A is seated in a normal state. A protruding portion 223a protruding upward is provided in the portion 223, and the temperature detector 6 is disposed below the protruding portion 223a.

  At the time of combustion in the normal state, the protrusion 223a is heated by the flame formed in the flame holding port 234 at the lower end of the predetermined tooth part 232A, but this heating amount is slight, and the temperature of the protrusion 223a is It does n’t rise that much. On the other hand, if the burner head 23 is set incorrectly, one of the flame outlets 233 is shifted to a position facing the projection 223a, and the projection 223a is strongly heated by the flame formed in the flame outlet 233, Even if any tooth portion 232 exists at a position facing the protrusion 223a, a relatively large amount of air-fuel mixture is ejected from the gap between the lower end of the tooth portion 232 and the body flange portion 223. The protrusion 223a is strongly heated by the flame formed by the combustion, and the temperature of the protrusion 223a rises quickly. Therefore, the detected temperature T of the temperature detector 6 also quickly rises to the first threshold value YT1, and it is possible to detect the erroneous setting of the burner head 23 with good responsiveness and stop the gas supply.

  As mentioned above, although embodiment of this invention was described with reference to drawings, this invention is not limited to this. For example, in the above embodiment, the temperature detector 6 is disposed below one circumferential direction of the body flange portion 223, but the temperature detector 6 is disposed below a plurality of circumferential locations on the body flange portion 223. May be. Further, the burner body 22 may be formed of a die-cast product instead of a sheet metal as in the above embodiment. In this case, it is desirable to reduce the thickness of the portion of the body flange portion 223 where the temperature is detected by the temperature detector 6. Furthermore, in the said 2nd Embodiment, although the projection part 223a is integrally molded in the body flange part 223, you may attach the separate projection part 223a to the body flange part 223. FIG. Moreover, in the said embodiment, although the infrared sensor is used as the temperature detector 6, things other than infrared sensors, such as a thermistor, can also be used. However, the infrared sensor does not need to be in close contact with the body flange portion 223, and the temperature detection accuracy of the body flange portion 223 does not deteriorate even if the sensor mounting position varies slightly in the vertical direction, and the reliability is improved. Therefore, it is desirable to use an infrared sensor as the temperature detector 6.

2 ... Combustor, 22 ... Burner body, 223 ... Body flange part, 223a ... Projection part, 23 ... Burner head, 232 ... Tooth part, 232A ... Predetermined tooth part, 233 ... Flame port, 6 ... Temperature detector, T ... temperature detected by temperature detector, YT1 ... first threshold, YT2 ... second threshold, t1 ... waiting time.

Claims (5)

A gas stove comprising a stove burner, the stove burner comprising a burner body and a burner head mounted on the burner body, and on the outer periphery of the lower surface of the burner head, radially outside the outer periphery of the upper end of the burner body In the case where a large number of tooth portions sitting on the body flange portion protruding in the circumferential direction are provided at intervals in the circumferential direction, and a flame outlet is formed in which a mixture is ejected in the gap between each tooth portion.
A gas stove, characterized in that a temperature detector for detecting the temperature of the body flange portion is disposed at least under one place in the circumferential direction of the body flange portion.   In the portion of the body flange portion that is located radially outward of the portion where the predetermined tooth portion of the tooth portion is seated in a state where the burner head is placed on the burner body at a predetermined normal phase. The gas stove according to claim 1, wherein a protruding portion protruding upward is provided, and the temperature detector is disposed under the protruding portion.   The gas stove according to claim 1 or 2, wherein the temperature detector includes an infrared sensor that detects infrared rays emitted from the lower surface of the body flange portion.   A state where the burner head is placed on the burner body in a predetermined normal phase is a normal state, and a temperature detected by the temperature detector is a temperature range detected by the temperature detector during combustion in the normal state. The gas stove according to any one of claims 1 to 3, wherein the gas supply to the stove burner is stopped when a predetermined first threshold value higher than the upper limit is reached. The state in which the burner head is placed on the burner body in a predetermined normal phase is regarded as a normal state, and after a predetermined waiting time has elapsed since ignition, the temperature detected by the temperature detector is a predetermined waiting time from ignition. Stop the gas supply to the burner when the temperature falls below a predetermined second threshold set lower than the lower limit of the temperature range detected by the temperature detector during combustion in the normal state after elapses. The gas stove according to any one of claims 1 to 4, wherein:

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