JP5706372B2 - Gas stove - Google Patents

Description

  The present invention relates to a gas stove.

  In general, in a gas stove including a stove burner having a large number of flame holes formed on the outer periphery, an ignition plug is provided near the outside of the stove burner to perform ignition by spark discharge. However, when an ignition plug is provided in the vicinity of the outside of the stove burner, boiled juice during cooking may adhere to the ignition plug and the ignition performance may be reduced.

  Therefore, a gas stove is known in which a pilot burner that forms a pilot flame for igniting the stove burner is disposed below the stove burner (see, for example, Patent Document 1 below). In this gas stove, a pilot flame by the pilot burner is formed so as to extend from the bottom to the top of the stove burner. Then, the pilot flame reaches the flame hole of the burner and ignites the burner.

  According to this, the pilot burner and its ignition plug can be accommodated inside the stove body covered with the top plate, and it is possible to prevent the spilled juice etc. from adhering to the ignition plug, thus preventing deterioration of the ignition performance can do.

  By the way, in this kind of pilot burner, in order to prevent wasteful consumption of fuel gas, it is preferable to form a minimum pilot flame necessary for igniting the stove burner. On the other hand, the gas supply pipe for the pilot burner that supplies the fuel gas to the pilot burner is branched from the gas supply pipe for the burner that supplies the fuel gas to the gas nozzle facing the inlet of the upstream end of the mixing pipe of the burner. Therefore, the amount of fuel gas supplied to the pilot burner is relatively large.

  For this reason, conventionally, the effective opening area of the pilot flame hole that forms the pilot flame in preparation for the pilot burner is made relatively small, and a predetermined amount of fuel gas that forms the optimum pilot flame is ejected from the pilot flame hole. I am doing so.

JP 60-233426 A

  However, if the effective opening area of the pilot flame hole is made small, the pilot flame hole is likely to be clogged by foreign matters such as dust mixed in the fuel gas. There is a disadvantage that the ignition performance to the burner is lowered without being able to form.

  In view of the above points, an object of the present invention is to provide a gas stove that can form an optimal pilot flame by preventing a decrease in ignition performance of the stove burner due to clogging of pilot flame holes.

In order to achieve this object, the present invention provides a stove burner having a large number of flame holes formed on the outer periphery, a gas nozzle facing the gas inlet at the upstream end of the mixing tube of the stove burner, and fuel gas to the gas nozzle. A first gas supply pipe to be supplied; a pilot burner that ignites the burner; a second gas supply pipe that branches from the first gas supply pipe and supplies fuel gas to the pilot burner; and ignites the pilot burner The pilot burner includes a pilot flame hole that forms a pilot flame for igniting the stove burner by ejecting a predetermined amount of fuel gas, and the first gas supply pipe includes: A gas amount limiting means for restricting the flow rate of the fuel gas in the first gas supply pipe so as to be releasable is provided upstream of the branch portion with the second gas supply pipe. The amount limiting means, wherein being configured to release the restriction of the gas flow rate of the gas flow rate of the first gas supply pipe at the maximum opening degree limit in the minimum opening, at least the pilot flame holes forms a pilot flame Meanwhile, the flow rate of the fuel gas in the first gas supply pipe is limited so that the amount of fuel gas distributed to the second gas supply pipe and ejected from the pilot flame hole becomes the predetermined amount.

  According to the present invention, at least while the pilot flame hole forms a pilot flame, the flow rate of the fuel gas in the first gas supply pipe is limited on the upstream side of the branch portion by the gas amount limiting means. At this time, the gas flow rate restricted in the first gas supply pipe is distributed to the second gas supply pipe so that the fuel gas when being supplied to the pilot burner and ejected from the pilot flame hole is the predetermined amount. To do.

  That is, the pilot flame hole forms a pilot flame suitable for igniting the above-described combustor by ejecting a predetermined amount of fuel gas. On the other hand, the fuel gas flowing from the first gas supply pipe through the second gas supply pipe through the branch portion is made the predetermined amount by the gas amount limiting means before reaching the pilot flame hole.

  According to this, the predetermined amount of fuel gas is ejected from the pilot flame hole without reducing the effective opening area of the pilot flame hole, so that the effective opening area of the pilot flame hole is made larger than before. It is possible to prevent clogging of the pilot flame hole due to foreign matters such as dust.

  In addition, by providing the gas amount limiting means on the upstream side of the branching portion, the flow rate of the fuel gas limited by the gas amount limiting means is added to the amount supplied to the burner. Accordingly, the fuel gas flow rate of the second gas supply pipe can be limited without extremely reducing the flow rate of the fuel gas limited by the gas amount limiting unit. It is also possible to prevent clogging caused by foreign matters such as mixed dust.

  Therefore, according to the present invention, by providing the gas amount limiting means, it is possible to prevent the deterioration of the ignition performance to the stove burner due to the clogging of the pilot flame hole, and to form an optimal pilot flame.

Explanatory drawing which fractures | ruptures and shows the principal part of the gas stove of embodiment of this invention. Explanatory drawing which shows typically a one part structure of the gas stove of embodiment of this invention. The flowchart which shows the ignition operation in embodiment of this invention.

  As shown in FIG. 1, the gas stove according to the embodiment of the present invention includes a top plate 1, a stove burner 2 partially protruding from the top plate 1, and a pilot burner 3 disposed below the top plate 1. I have. The top plate 1 covers the upper part of the stove body (not shown).

  The stove burner 2 includes a burner body 5 having a mixing tube 4, a burner head 7 provided on an upper portion of the burner body 5 and passing through a burner opening 6 of the top plate 1 and exposed on the top plate 1, and a burner head 7, a burner cap 8 placed on top of the burner, a secondary air guide plate 9 attached to the top of the burner cap 8 with a gap, and a bottom of the pot that protrudes upward through the secondary air guide plate 9 And a temperature sensor 10. Further, a closing plate 11 is provided on the outer periphery of the burner head 7 to close a gap formed between the burner opening 6.

  The burner cap 8 is provided with a large number of grooves at predetermined intervals in the circumferential direction. When the burner cap 8 is placed on the burner head 7, a large number of flame holes 12 are formed by these grooves.

  A gas inlet 13 is provided on the upstream side of the mixing tube 4. A gas nozzle 15 faces the gas inlet 13 through an opening 14 at the upstream end of the mixing tube 4. The gas nozzle 15 is provided at the downstream end of a gas burner pipe 16 (first gas feed pipe) for supplying fuel gas to the burner 2.

  The fuel gas ejected from the gas nozzle 15 toward the gas inlet 13 flows into the mixing tube 4 while entraining primary air from the opening 14 at the upstream end of the mixing tube 4 by the gas flow. Then, fuel gas and primary air are mixed inside the mixing tube 4, and this mixed gas is ejected from the flame hole 12 and burned.

  A pilot burner 3 is provided on the side of the burner body 5, and the pilot burner 3 includes a part of the peripheral wall of the burner head 7 facing the pilot burner 3 and a part of the inner side of the closing plate 11 covering the pilot burner 3. A flame guide portion 17 is formed. The pilot flame guide unit 17 guides the pilot flame formed by the pilot burner 3, and guides the pilot flame from a pilot flame outlet 18 that opens adjacent to the lower side of the flame hole 12 of the stove burner 2.

  The pilot burner 3 is formed in a hollow cylindrical shape, and a pilot burner gas supply pipe 19 (second gas supply pipe) is connected to an upstream end thereof. The fuel gas is supplied from the pilot burner gas supply pipe 19, and the fuel gas ejected from the pilot flame hole 20 formed at the tip is combusted to form a pilot flame.

  The pilot burner 3 is ignited by a spark plug 22 that is integrally connected via a connecting member 21. The pilot burner 3 is provided in a posture in which the pilot flame hole 20 is directed obliquely upward, and the pilot flame formed by the pilot flame hole 20 extends obliquely upward and enters the pilot flame guide portion 17. It is derived from the pilot flame outlet 18.

  Since the pilot flame outlet 18 is adjacent to the flame hole 12 of the stove burner 2, the pilot flame derived from the pilot flame outlet 18 is transferred to the flame hole 12 and the cono burner 2 is ignited.

  A first thermocouple 23 is provided at a position facing the pilot flame hole 20 of the pilot burner 3, and is opposed to the outside of the flame hole 12 at a position opposite to the pilot flame outlet 18 of the stove burner 2. A second thermocouple 24 is provided.

  As shown in FIG. 2, the gas supply pipe 16 for the stove burner is provided with an original solenoid valve 25, a gas amount limiting means 26, and a needle 27 in order from the upstream side. The upstream side of the original solenoid valve 25 is connected to a fuel gas supply source via a pipe such as a gas hose (not shown).

  A pilot burner gas supply pipe 19 is connected between the gas amount limiting means 26 and the needle 27 in the gas supply pipe 16 for the stove burner via a branch portion X. The pilot burner gas supply pipe 19 is provided with a pilot burner solenoid valve 28.

  The gas amount limiting means 26 is configured by connecting an orifice 29 and a conburner electromagnetic valve 30 in parallel. The orifice 29 restricts the gas flow rate of the gas supply pipe 16 for the burner by closing the electromagnetic valve 30 for the burner. When the conoburner solenoid valve 30 is opened, the restriction of the gas flow rate by the orifice 29 is released.

  The fuel gas that has passed through the orifice 29 when the conoburner solenoid valve 30 of the gas amount limiting means 26 is in the closed state passes through the branch portion X, and the conoburner gas supply pipe 16 and the pilot burner gas supply pipe 19 Distributed to.

  At this time, the fuel gas flowing into the pilot burner gas supply pipe 19 is limited by the orifice 29, so that it is necessary to form an optimal pilot flame in the pilot flame hole 20 (the predetermined amount in the present invention). Equivalent).

  For this reason, even if the opening cross-sectional area of the pilot flame hole 20 is increased, excessive fuel gas is not ejected from the pilot flame hole 20. Therefore, the pilot flame hole 20 can be prevented from being clogged with dust or the like by making the opening cross-sectional area of the pilot flame hole 20 relatively large.

  At the same time, the fuel gas flowing into the gas supply pipe 16 for the burner is restricted by the orifice 29, so that unburned fuel gas is not unnecessarily supplied to the burner 2. As a result, the amount of unburned fuel gas flowing out from the flame hole 12 of the stove burner 2 is suppressed, and it is also possible to prevent ignition in the stove burner 2 immediately after ignition by the pilot burner 3.

  In addition, the cross-sectional area of the flow path of the fuel gas at the orifice 29 needs to be extremely small by taking into account the flow rate distributed to both the gas burner pipe 16 and the pilot burner gas supply pipe 19. In addition, it is possible to prevent the foreign matter such as dust mixed in the fuel gas from clogging the orifice 29.

  The original solenoid valve 25, the solenoid valve 30 for the burner of the gas amount limiting means 26, and the solenoid valve 28 for the pilot burner are connected to a gas stove controller and controlled to open and close. The controller includes the ignition control means 31 as its function.

  The ignition control means 31 is provided with an ignition switch 32 provided on an operation panel (not shown) of the gas stove, which is electrically connected, and starts an ignition operation when the user operates the ignition switch 32.

  The ignition control means 31 includes a pilot flame based on an ignition drive unit 34 that activates the igniter 33 according to the operation of the ignition switch 32, and an electromotive force generated by heating the first thermocouple 23 and the second thermocouple 24. Determining unit 35 for determining the presence or absence of ignition and the presence or absence of ignition to the combustor, and the electromagnetic valve 25 for the combustor and the solenoid valve 30 for the pilot burner of the gas amount limiting means 26 according to the determination result of the determining unit 35 And a solenoid valve control unit 36 that opens and closes 28 as a function.

  Furthermore, the ignition control means 31 is provided with a notifying means 37 provided on an operation panel (not shown) of the gas stove, and can be informed of an error based on the determination result of the determination section 35. Yes. Specifically, a display (such as a 7-segment LED) or a sound generator (such as a buzzer or a speaker) is employed as the notification unit 37.

  Here, the operation of the ignition control means 31 in the present embodiment will be described based on FIG. 2 and FIG. When the ignition switch 32 is ignited, the ignition control means 31 starts an ignition operation in STEP 1 as shown in FIG. Next, the ignition control unit 31 proceeds to STEP 2 and drives the igniter 33 by the ignition drive unit 34. As a result, spark discharge occurs between the spark plug 22 and the vicinity of the pilot flame hole 20 of the pilot burner 3.

  Further, the ignition control means 31 proceeds to STEP 3 and the electromagnetic valve control unit 36 closes the electromagnetic valve 30 for the gas burner limiting means 26, proceeds to STEP 4 to open the original electromagnetic valve 25, and further, Proceeding to STEP 5, the pilot burner solenoid valve 28 is opened. Thereby, supply of the fuel gas to the stove burner 2 and the pilot burner 3 is started, and the pilot burner 3 is ignited to form a pilot flame. Then, the pilot flame extending upward from the pilot burner 3 at this time is in contact with the first thermocouple 23, guided to the pilot flame guide portion 17, and led out from the pilot flame outlet 18.

  The fuel gas supplied to the pilot burner 3 is limited to an amount capable of forming an optimal pilot flame by the orifice 29 of the gas amount limiting means 26. Therefore, at this time, the pilot flame formed by the pilot flame hole 20 having a relatively large effective opening area of the pilot burner 3 is formed in an optimum size for igniting the stove burner 2. In addition, since the effective opening area of the pilot flame hole 20 is relatively large, dust or the like is not clogged in the pilot flame hole 20, and the combustor 2 is smoothly ignited.

  Next, the ignition control means 31 proceeds to STEP6. In STEP 6, the determination unit 35 determines whether or not the pilot burner 3 is ignited based on the electromotive force of the first thermocouple 23. If the pilot flame is normally formed in the pilot burner 3, the process proceeds to STEP7.

When proceeding to STEP 7, the determination unit 35 of the ignition control means 31 determines whether or not the burner 2 is ignited based on the electromotive force of the second thermocouple 24. When the ignition to the burner 2 is confirmed in STEP 7, the ignition control means 31 proceeds to STEP 8 and causes the solenoid valve control unit 36 to close the pilot burner solenoid valve 28. Thereby, supply of the fuel gas to the pilot burner 3 is stopped, and the pilot burner 3 is extinguished.

  Thus, since the pilot burner 3 is extinguished after it is confirmed that the stove burner 2 is ignited, wasteful consumption of fuel gas in the pilot burner 3 can be prevented.

  Subsequently, the ignition control unit 31 proceeds to STEP 9, and the determination unit 35 confirms whether or not the pilot burner 3 is extinguished based on the electromotive force of the first thermocouple 23. Then, when it is confirmed that the pilot burner 3 is extinguished, the ignition control means 31 proceeds to STEP 10 and the electromagnetic valve control unit 36 opens the electromagnetic valve 30 for the burner burner of the gas amount restriction means 26. As a result, the restriction on the flow rate of the fuel gas by the orifice 29 of the gas amount restriction means 26 is released, and a sufficient amount of fuel gas can be supplied to the cono burner 2 through the gas supply pipe 16 for the stove burner. Then, the ignition control means 31 proceeds to STEP 11 and ends the ignition operation.

  Further, the ignition control means 31 includes error processing relating to the ignition operation as in STEP 12 to STEP 19 in FIG. That is, if it is determined in STEP 6 that the pilot flame by the pilot burner 3 is not formed, the ignition control means 31 proceeds to STEP 12 and STEP 13 and the solenoid valve control unit 36 controls the pilot burner solenoid valve 28 and the original. The electromagnetic valve 25 is closed, and the process proceeds to STEP 14 where the notification means 37 notifies the user that an ignition error has occurred in the pilot burner.

  When it is determined in STEP 7 that the combustor 2 is not ignited, the ignition control means 31 proceeds to STEP 15 and STEP 16 and causes the solenoid valve controller 36 to close the pilot burner solenoid valve 28 and the original solenoid valve 25, and then proceeds to STEP 17. The user is informed through the notification means 37 that the ignition failure has occurred in the stove burner 2.

  If it is determined in STEP 9 that the pilot burner 3 is not properly extinguished, the ignition control means 31 returns to STEP 18 because the pilot burner solenoid valve 28 has already been closed in STEP 8. The electromagnetic valve control unit 36 closes the original electromagnetic valve 25 and then proceeds to STEP 19 to notify the user via the notification means 37 that the pilot burner 3 is not extinguished and an abnormality has occurred. By the above error processing, the user can surely know the abnormality of the stove burner 2 and the pilot burner 3.

  In the present embodiment, the example in which the gas amount limiting means 26 is configured by the orifice 29 and the electromagnetic valve 30 for the burner has been shown. You may employ | adopt the gas quantity control valve which restrict | limits the same gas flow rate and cancels | releases the restriction | limiting of a gas flow rate by maximum opening.

  Moreover, in this embodiment, although the example which used the thermocouple (1st thermocouple 23) for the detection of the pilot flame was shown, it replaces with a thermocouple and a thermistor is employable. In this case, the determination part 35 should just determine the presence or absence of a pilot flame based on resistance value instead of an electromotive force.

  DESCRIPTION OF SYMBOLS 2 ... Cono burner, 3 ... Pilot burner, 4 ... Mixing pipe, 12 ... Flame hole, 13 ... Gas inlet, 15 ... Gas nozzle, 16 ... Gas supply pipe (first gas supply pipe) for cono burner, 19 ... Pilot burner Gas supply pipe (second gas supply pipe), X ... branching part, 20 ... pilot flame hole, 22 ... spark plug, 26 ... gas amount limiting means.

Claims (1)

A stove burner having a plurality of flame holes formed on the outer periphery, a gas nozzle facing the gas inlet at the upstream end of the mixing pipe of the stove burner, a first gas supply pipe for supplying fuel gas to the gas nozzle, and the stove burner A gas stove comprising: a pilot burner for igniting the first gas supply pipe; a second gas supply pipe for branching from the first gas supply pipe to supply fuel gas to the pilot burner; and an ignition plug for igniting the pilot burner.
The pilot burner includes a pilot flame hole that forms a pilot flame for igniting the stove burner by ejecting a predetermined amount of fuel gas,
The first gas supply pipe is provided with a gas amount restriction means for restricting the flow rate of the fuel gas in the first gas supply pipe in a releasable manner upstream from a branch portion with the second gas supply pipe.
The gas amount limiting means is configured to limit the gas flow rate of the first gas supply pipe with a minimum opening degree and to release the restriction of the gas flow rate with a maximum opening degree, and at least the pilot flame hole forms a pilot flame. During the operation, the flow rate of the fuel gas in the first gas supply pipe is limited so that the amount of fuel gas distributed to the second gas supply pipe and ejected from the pilot flame hole becomes the predetermined amount. .

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