JPH07269847A - Gas apparatus - Google Patents

Abstract

PURPOSE:To control a gas apparatus to provide an accurate calorific value even when the type of gas or apparatus such as a nozzle, etc., are not the same. CONSTITUTION:A measuring means to measure the rising speed of a temperature in an apparatus is provided. A flow rate regulating valve 102 to regulate a gas flow rate is provided. A control unit 104, which performs a gas flow rate regulation by the flow rate regulating valve 102 based on a used calorific value which is presumed by a temperature rising speed being measured by the measuring means under a condition wherein the gas flow rate is fixed, is provided. Then, the flow rate regulating valve 102 is a proportional type flow rate regulating valve 102a, and the control unit 104 performs the regulation of a gas flow rate by correcting the relative relationship between a calorific value to be used and a control current value of the proportional type flow rate regulating valve 102a.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas appliance such as an oven or a fan heater.

[0002]

2. Description of the Related Art In a conventional gas appliance, for example, an oven, the amount of gas is adjusted only by feeding back the internal temperature.

[0003]

However, since the amount of gas is regulated only by the temperature inside the chamber as in the conventional case described above,
I didn't really know how much heat was being used at that time.
In this way, since the amount of heat actually used at that time is unknown, there were the following problems. B) Since there are variations in gas components, nozzle dimensional accuracy, and governor pressure regulation, the gas appliance must be designed with a safety factor of 30% when designing gas appliances. There was a problem that the design had to be performed with a performance of nearly 70%.

B) When a gas of high calorific value flows due to an error in the gas type, there is only a gas cutoff that cuts at the maximum temperature, during which gas appliances may be damaged or incomplete combustion may occur. Possibility of generation of poisonous gas. C). If a gas with a low calorific value flows due to an incorrect gas type, there is a risk that the preheating time will become abnormally long or the gas appliance will be damaged.

The present invention has been made in view of the above-mentioned problems of the conventional example, and the purpose thereof is to make it possible to set the maximum heat quantity at the combustion limit and always enable the shortest preheating time. Also, the variation of overshoot and undershoot during temperature control can be made constant, the baking performance can be stabilized, and mistakes in gas type, nozzle clogging, etc. can be detected at a relatively early stage, which damages gas appliances. There is a need to provide a gas appliance that can be small.

[0006]

In order to solve the problems of the above-mentioned conventional examples and achieve the object of the present invention, the gas appliance of the present invention comprises a measuring means 101 for measuring the rising rate of the internal temperature,
The flow rate control valve 102 for controlling the gas flow rate, and the gas flow rate control valve 102 for controlling the gas flow rate based on the amount of heat used estimated from the temperature rising rate measured by the measuring means 101 under the condition that the gas flow rate is constant. It is characterized by comprising a control unit 104 for performing.

The flow rate adjusting valve 102 is a proportional type flow rate adjusting valve 102a, and the control section 104 adjusts the gas flow rate by correcting the correlation between the amount of heat used and the control current value of the proportional type flow rate adjusting valve 102a. It is preferable to do it. Further, it is preferable that the rate of increase in the internal temperature measured by the measuring means 101 be obtained in the time required for the internal temperature to rise to a certain temperature. It is also preferable that the rate of increase in the internal temperature measured by the measuring means 101 is determined by the internal temperature that has increased in a certain period of time.

Further, the control unit 104 outputs an abnormality output unit 10 which judges that there is an abnormality and shuts off the gas to give an alarm when the time required for the internal temperature to rise to a certain temperature is outside the set time.
It is also preferable that 5 is provided. Further, it is preferable that the control unit 104 is provided with an abnormality output unit 105 that judges that there is an abnormality and shuts off the gas to give an alarm when the temperature inside the refrigerator which has risen over a certain period of time is outside the set temperature.

Further, when the temperature inside the chamber immediately after ignition is equal to or higher than a predetermined temperature, the controller 104 uses the time required for the temperature inside the chamber previously measured by the measuring means 101 to rise to a certain temperature, It is also preferable that when there is no data, the control is performed using the standard time required for the inside temperature to rise to a certain temperature. In addition, the control unit 10
4 is when the temperature inside the chamber immediately after ignition is equal to or higher than a predetermined temperature,
It is set to use the temperature inside the chamber that was measured by the measuring means last time and increased during a certain period of time, and use the standard temperature inside the chamber that increases during a certain period of time when there is no previous data. Is also preferable.

[0010]

According to the present invention having the above-described structure, however, the rate of rise of the temperature inside the chamber is measured by the measuring means 101 under the condition that the gas flow rate is constant, and the gas is estimated from this rate of temperature rise. The gas flow rate is adjusted by the flow rate control valve 102 based on the amount of heat generation.

The flow rate control valve 102 is a proportional flow rate control valve 102a, and the control unit 104 adjusts the gas flow rate by correcting the correlation between the amount of heat used and the control current value of the proportional flow rate control valve 102a. If it is to be performed, the amount of heat used can be estimated with a simple configuration in which the control current value of the proportional flow control valve 102a is measured, and the gas flow rate can be adjusted so that the desired amount of heat is used. It will be possible to adjust.

Further, the rate of rise of the internal temperature measured by the measuring means 101 can be obtained by the time required for the internal temperature to rise to a certain temperature, or the internal temperature of the warehouse measured by the measuring means 101 can be measured. The rate of increase of the internal temperature can be measured with a simple configuration by the fact that the rate of increase of the internal temperature can be obtained from the internal temperature of the internal oven that has increased over a certain period of time.

Further, the control unit 104 outputs an abnormality output unit 10 which judges that there is an abnormality and shuts off the gas to give an alarm when the time required for the internal temperature to rise to a certain temperature is outside the set time.
5 is provided, or the control unit 104 is provided with an abnormality output unit 105 that determines that there is an abnormality and shuts off the gas to give an alarm when the temperature inside the chamber that has risen for a certain period of time is outside the set temperature. When there is an abnormal increase in the temperature inside the refrigerator, the gas is shut off and an alarm is issued to warn of the abnormality.

Further, in high temperature cooking or the like, when the interior of the refrigerator is not sufficiently cooled, when the interior is ignited again, and the interior temperature immediately after ignition is equal to or higher than a predetermined temperature, the interior of the interior previously measured by the measuring means 101. The gas flow rate that is the time required for the temperature to rise by a certain temperature, or the amount of heat used that is automatically required by using the temperature inside the chamber that was raised during the certain time previously measured by the measuring means. In addition, when there is no previous data, control is performed using the standard time required for the internal temperature of the refrigerator to rise to a certain temperature.

[0015]

EXAMPLES The present invention will be described in detail below based on examples. As the gas appliance of the present invention, there are an oven, a gas fan heater, and the like, and an oven will be exemplified and described below. FIG. 1 shows a schematic overall configuration diagram of the present invention. 1 in FIG.
Is a cooking chamber of the oven, 11 is a burner for heating the inside of the cooking chamber 1, and 112 is a gas nozzle provided at the tip of the gas passage portion 106. Reference numeral 102 denotes a flow rate adjusting valve arranged on the upstream side of the gas nozzle 112 of the gas passage portion 106 for adjusting the gas flow rate. In the embodiment, the flow rate adjusting valve 102 is generally referred to as a proportional valve. A control valve 102a is used. The proportional flow rate control valve 102a is, for example, as shown in FIG. 6, and is configured by attaching the plunger 108 of the electromagnetic solenoid portion 107 to the diaphragm valve 109, and controlling the flow to the coil portion 110 of the electromagnetic solenoid portion 107. The open state of the diaphragm valve 109 is adjusted by changing the current value. The control of the proportional flow rate control valve 102a is performed by a control signal from the control unit 104. Further, in FIG. 1, 111 is a temperature sensor for detecting the temperature in the cooking cabinet 1, and a detection signal from the temperature sensor 111 is input to the control unit 104. Gas passage 10
An electromagnetic valve 113 is provided on the upstream side of the flow control valve 102 of No. 6.

Next, the oven will be described. 2 to 4 show an example of an oven used in the present invention.
The front part of the cooking cabinet 1 has an opening, and the opening can be closed by a door 25 that can be opened and closed. A burner 11 and a combustion fan 15 which constitute the heating unit 2 are arranged in the rear center of the cooking cabinet 1 with the positions thereof shifted front and back. The burner 11 is arranged in the combustion chamber 4 provided behind the cooking chamber 1, and the combustion fan 15 is arranged in the combustion fan storage chamber 5 provided behind the combustion chamber 4. Here, a passage chamber 7 partitioned by a partition plate 6 is provided between the combustion chamber 4 and the combustion fan storage chamber 5, and a space above the partition plate 6 is a passage for hot air.
A plurality of hot air inlets 9 are provided in the front-rear direction on the upper and lower sides of the left and right side surfaces of the cooking cabinet 1, respectively. Ducts 8 are provided on the left and right for communicating the hot air inlets 9 on both sides of the cooking cabinet 1 from both sides of the combustion fan storage chamber 5. In the embodiment, since the temperature in the duct 8 and the temperature in the cooking cabinet 1 are almost the same, the temperature sensor 111 is arranged in the duct 8 and the cooking cabinet 1 is detected by detecting the temperature in the duct 8. It is considered that the temperature inside is detected. A hot air outlet 10 communicating with the combustion chamber 4 is provided above the rear surface of the cooking cabinet 1, and the hot air entering the combustion chamber 4 from the hot air outlet 10 further flows into the passage chamber 7 from the passage above the partition plate 6. It has become. The combustion chamber 4 is provided with a combustion air supply port 19 to which combustion air is supplied. Further, an exhaust port 13 is provided on the rear wall 12 of the combustion fan storage chamber 5, and the exhaust port 13
Communicates with the exhaust passage 21 whose tip opens to the outside. Behind the combustion fan storage chamber 5, there is a cooling fan storage chamber 14
Are arranged, and the combustion fan storage chamber 5 and the cooling fan storage chamber 14 are partitioned by a heat insulating plate 22, and the heat of the exhaust chamber 20 is separated by the heat insulating plate 22.
The motor 18 arranged rearward of the motor 18 is not affected. A part of the cooling fan storage chamber 14 communicates with the exhaust passage 21, and the cooling fan storage chamber 14 is provided with a cooling air intake port 28. A cooling fan 17 is further fixed to the output shaft 16 of the combustion fan 15,
The cooling fan 17 is arranged in the cooling fan storage chamber 14, and the output shaft 16 is rotated by a motor 18 arranged behind the cooling fan storage chamber 14.

A water tray is placed on the bottom of the cooking cabinet 1, and an oven plate and a grill are arranged in the middle of the cooking cabinet 1. . Further, the gas cooking apparatus can perform both cooking at a normal cooking temperature of 250 ° C. or lower and high temperature cooking at 300 ° C. or higher. In the above configuration, the burner 1
When the gas is burned by 1 and the combustion fan 15 is rotated, the hot air generated by the combustion of the burner 11 is passed by the combustion fan 15 through the ducts 8 from the hot air inlets 9 provided on both side portions of the cooker 1 to the cooker 1 Is forced to flow into the cooking chamber 1 to heat the inside of the cooking chamber 1 and return to the inside of the combustion chamber 4 from the hot air outlet 10 provided at the upper portion of the rear surface of the cooking chamber 1 again.
In the combustion chamber 4, the flame of the burner 11 reheats the heat, and the combustion fan 15 again causes the hot air to flow into the cooking chamber 1 through the duct 8 to reheat and circulate the hot air to heat the cooking chamber 1. is there. Therefore, the heating unit 2 including the burner 11 and the combustion fan 15,
A hot air circulation path 29 is constituted by the duct 8, the hot air inlet 9, the cooking cabinet 1, the hot air outlet 10, and the like. A part of the hot air that circulates flows from the exhaust port 13 to the exhaust chamber 20,
It is exhausted to the outside through the exhaust passage 21. In this case, the outside air is sucked by the cooling fan 17 and flows into the exhaust passage 21 to lower the temperature of the exhaust gas discharged from the exhaust passage 21, and at the same time, the cooling fan 17 cools the outside air to cool the motor 18. It is designed to prevent overheating.

By the way, the oven used in this embodiment is
The capacity of the burner 11 and the capacity of the combustion fan 15 are set so that the heating unit 2 can heat the interior temperature to 300 ° C. or higher for cooking. For this reason, it is possible not only to perform conventional cooking in which the temperature inside the refrigerator is 250 ° C. or lower, but also to perform high-temperature cooking in which the temperature inside the refrigerator is 300 ° C. or higher as required. FIG. 5 shows a block circuit diagram of the oven of the present invention. 1
01 is a measuring means for measuring the rising speed of the internal temperature,
In the embodiment, the measuring means 101 obtains the time t required for the inside temperature to rise to a certain temperature and inputs the value to the control unit 104. Then, the heat quantity used is estimated based on the time t and the measured value of the gas flow rate, and the flow rate control valve 10 is adjusted by correcting the correlation between the heat quantity used and the gas flow rate based on the estimated value. Control unit 1
It is controlled by 04 to adjust the gas flow rate so as to obtain the desired heat quantity to be used. In FIG. 5, reference numeral 105 denotes an abnormality output unit 105 which judges that there is an abnormality and shuts off the gas to give an alarm when the time required for the interior temperature to rise by a certain temperature is outside the set time, and 115 is a control unit. It is an alarming means such as lighting or a buzzer for issuing an alarm by an output from the abnormality output section 105 provided in 104.

Here, the flow control valve 102 is the proportional flow control valve 102a as in the embodiment, the measuring means 101 measures the control current value of the proportional flow control valve 102a, and the amount of heat used The case where the control unit 104 adjusts the gas flow rate by correcting the correlation between the control current value and the control current value will be specifically described. As described above, in the embodiment, the temperature sensor 111 for detecting the temperature inside the refrigerator is attached to the duct portion 8 beside the cooking cabinet 1, and the temperature of this portion is regarded as the temperature inside the refrigerator. Then, only in the case of high-temperature cooking that requires preheating in the oven, the measuring unit 101 obtains the time t until the temperature inside the chamber reaches 100 ° C. to 175 ° C. by the temperature sensor 111 and the control unit 1
Enter 04. The control current value Is flowing through the proportional flow control valve 102a flowing at this time is kept at a constant value. Here, the time t is the amount of heat used (kca
It has been confirmed by experiments that only 1) is affected and the others are hardly affected. Therefore, time t
Since the change of the heat quantity due to the variation of the gas component and the like can be found by obtaining the value, it becomes possible to correct the heat quantity. Thus, in the embodiment, the control unit 104 is based on the internal temperature information.
Is used to control the control current flowing through the proportional flow rate regulator 102a to regulate the gas flow rate so that the correct heat quantity (kcal / h), that is, the correct input quantity is obtained.

Hereinafter, the rate of rise of the temperature inside the chamber measured by the measuring means 101 is determined by the time required for the temperature inside the chamber to rise to a certain temperature, the amount of heat used is estimated, and based on this estimated amount of heat A method for controlling the flow rate of the gas so that the corrected heat quantity (input) is corrected by controlling the control current flowing through the proportional flow rate control valve 102a will be described in detail.

Now, if the weight of the oven is W ₀ , the specific heat of the oven is Cp ₀ , the temperature raised by heating the oven during the time t ₀ is ΔT ₀ , and the amount of heat applied to the oven is Q ′ ₀ , then Q ′ ₀ = Wo · Cp ₀ · ΔT ₀ [kcal] (1), and the heat quantity Qo required at that time is Q ₀ = Q ′ ₀ / η (= constant) [kcal] (2) η; oven Further, the reference gas consumption amount q _{0 at} this time is q ₀ = Q ₀ / H ₀ [m ³ ] ... (3) H ₀ ; Heat value of reference gas [kcal / m ³ ] The gas amount q from the nozzle is q = A · S · (p / d) ^1/2 [m ³ / h] (4) A; orifice coefficient, S; nozzle cross-sectional area p; gas pressure, d; specific gravity of the gas also, the relationship between the proportional valve current and gas flow rate I = B · (p / d ) 1/2 + C [mA] ......... (5) B; constant, ; Constant (3), (4), (5) from _{Q 0 = H 0 · q 0} = H 0 · A · S · (p / d) 1/2 · t 0/3600 sec = (A / 3600 _{/ B) · H 0 · S} · t 0 · (I-C) [kcal] ......... (6) Thus in general _{Q 0 = H · S · t} · (I-C) = constant ......... (7 ) H: Gas calorific value [kcal / m ³ ] S: Nozzle area [m ² ] t; Required time [sec] I: Control current [mA] of proportional flow control valve Here, the formula (7) is used. Since H and S are always the same, I = K / t + C (8) If the reference current is I ₀ , it takes t ₀ seconds to obtain K = t ₀ · (I ₀ −C). Become. Therefore, the standard formula is I = t ₀ · (I ₀ −C)
/ T + C (9) Next, when H (gas calorific value) or S (nozzle area) changes, K in the equation (8) changes. If the control current of the proportional flow control valve at that time is I ₀ and it takes t ₁ seconds, K = t ₁ · (I ₀ −C) Therefore I = t ₁ · (I ₀ −C) / t + C ……… (10) (Note) FIG. 10 shows graphs of the above equations (9) and (10). Also, if the heat quantity is Q _0, it always takes t ₀ seconds, so (1
The value obtained by adding t ₀ to the expression (0) becomes I ₁ . Therefore, I ₁ = t ₁ · (I ₀ −C) / t ₀ + C Next, in the formula (5), when the same gas is used in the same instrument, I = B ′ · Ip + C …… (5) ′ (5 ) ′ Is the control current value of the proportional flow control valve when the reference input Ip ₀ is added to I ₁ , I ₁ = B ′ · Ip ₀ + C; The control current value Ii of the proportional flow control valve for obtaining the required input Ip ₁ is Ii = (I ₁ −C) / Ip ₀ · Ip ₁ + C (11) Note that the proportional flow control valve is shown in FIG. 7. A graph showing the relationship between the control current of 102a and the amount of heat (input) is shown. Further, FIG. 8 shows a graph showing the relationship between the control current I of the proportional flow rate control valve 102a and the time t required for raising the temperature.

However, from the above description, even if H (gas calorific value), S (nozzle area), p (gas pressure), etc. change, the correct calorific value (input) [kcal /
h] can be issued. Also, the limits of combustion chamber capacity can be used. That is, in FIG. 9, the combustion limit (heat generation amount indicating the limit of the combustion chamber capacity, that is, Ip = −4.63T + 63) between the heat amount (input) and the internal temperature
A graph showing the relationship in 15) is shown, but now,
When the temperature in the cooking cabinet is 300 ° C., the input Ip is the amount of heat shown in FIG. 9 as the limit of the combustion chamber capacity, and when the temperature in the cooking cabinet is 350 ° C., the input Ip is input Ip.
As for p, the amount indicated by B in FIG. 9 is the limit heat amount of the combustion chamber capacity, and can be adjusted to the limit input amount of the combustion chamber capacity based on the internal temperature. In other words, the limit start dash mode becomes possible. In addition, if the gas type is wrong, the nozzle is wrong, or the chips are clogged, the time required for the internal temperature to rise to a certain temperature is outside the set time, so it is judged as abnormal. The electromagnetic valve 113 is closed by the output from the abnormality output unit 105 to shut off the gas, and the alarm means 115 issues an alarm.

FIG. 10 shows the above equation (9) (reference equation) and a graph obtained from the above equation (10). Based on the reference equation of this graph, the proportional flow rate control is performed by measuring time. The control current value of the valve is obtained. In FIG. 10, t ₀ is a reference time, I ₀ is a reference current value, and when the measurement time is t ₁ , the current value is corrected to I ₁ . This correction is performed by the control unit 104, and the control current value of the proportional flow rate control valve is controlled to be the above-mentioned corrected control current, whereby a correct input, that is, a correct heat amount [kcal / h] is obtained. The amount of gas can be adjusted like this.

Further, in the present invention, when the temperature inside the chamber immediately after ignition is equal to or higher than the predetermined temperature, the control unit 104 uses the time required for the temperature inside the chamber previously measured by the measuring means 101 to rise by a certain temperature. However, when there is no previous data, it is set to control using the standard time required for the inside temperature to rise to a certain temperature, and the inside is not sufficiently cooled during high temperature cooking etc. In this case, the amount of gas is adjusted and controlled so that the desired amount of heat can be obtained even when ignition is performed.

In the above embodiment, the rate of increase of the temperature inside the chamber measured by the measuring means 101 is determined by the time required for the temperature inside the chamber to rise to a certain temperature. The rate of increase of the internal cold storage temperature measured by the means 101 may be obtained from the internal cold storage temperature that has risen in a certain period of time. FIG. 11 is a graph showing the relationship between the temperature ΔT (° C.) increased between 120 seconds and 220 seconds after ignition and the control current of the proportional flow rate control valve 102a.

In this embodiment, the control unit 104 is
An abnormality output unit 105 is provided for determining that there is an abnormality and shutting off the gas to give an alarm when the internal cold room temperature that has risen during a certain fixed time is outside the preset temperature. In this case, the gas is stopped and an alarm is issued by the alarm means 115. In this case, the control unit 104 uses the temperature inside the chamber immediately after ignition over the predetermined temperature when the temperature inside the chamber immediately after ignition is equal to or higher than the predetermined temperature. It is set to control using the standard internal chamber temperature that rises with time, so that the target amount of heat can be obtained even when igniting when the internal chamber is not sufficiently cold during high temperature cooking etc. The amount of gas is regulated and controlled.

[0027]

According to the first aspect of the present invention, as described above, the measuring means for measuring the rising speed of the internal temperature, the flow rate adjusting valve for adjusting the gas flow rate, and the gas flow rate are set. Since there is a control unit that adjusts the gas flow rate by the flow rate control valve based on the amount of heat used estimated from the temperature rise rate measured by the above-mentioned measuring means under constant conditions, there are variations due to gas components and nozzles. It is possible to obtain the correct amount of heat even if there is a variation in the gas pressure, a variation in the gas pressure, etc. Also, the maximum input of the combustion limit can be input, and the shortest preheating time is always possible. . In addition, since the variations in overshoot and undershoot during temperature control are constant, the baking performance is stable.

According to the second aspect of the present invention, the flow rate control valve is a proportional flow rate control valve, and the control unit has a correlation relationship between the amount of heat used and the control current value of the proportional flow rate control valve. Since the gas flow rate is adjusted by the correction of, the flow rate of the gas can be controlled with a simple configuration by controlling the control current of the proportional flow rate control valve so that the heat quantity is correct. Further, in the invention according to claim 3, the rate of increase of the internal temperature measured by the measuring means is obtained by the time required for the internal temperature to rise by a certain temperature, and The rate of increase in internal temperature can be easily obtained.

Further, in the invention according to claim 4, since the rate of increase of the temperature inside the chamber measured by the measuring means is obtained by the temperature inside the chamber which has risen in a certain time, the temperature inside the chamber The rising speed of can be easily obtained. Further, in the invention according to claim 5, when the time required for the internal temperature of the refrigerator to rise to a certain temperature is outside the set time, the control unit judges that it is abnormal and shuts off the gas to give an alarm. Since the abnormality output section is provided, the time required for the internal temperature to rise to a certain temperature in the case of an error in the gas type or equipment malfunction is outside the set time, and the output of the abnormality output section
It is possible to prevent an accident by stopping the gas and issuing an alarm by an alarm means.

Further, in the invention according to claim 6, for the abnormal condition, the control unit judges that there is an abnormality and shuts off the gas to give an alarm when the temperature inside the chamber which has risen in a certain period of time is outside the set temperature. Since the output unit is provided, the temperature inside the chamber that has risen during a certain period of time when the gas type is wrong or the device is abnormal becomes outside the set temperature, and the output of the abnormality output unit stops the gas and the alarm means is activated. An alarm can be given to prevent an accident.

Further, in the invention according to claim 7, the control unit raises a certain temperature inside the chamber previously measured by the measuring means when the temperature inside the chamber immediately after ignition is equal to or higher than a predetermined temperature. It is set to control using the standard time required for the temperature in the refrigerator to rise to a certain temperature when there is no previous data, so when using high temperature cooking etc. It is possible to control so that an accurate amount of heat can be obtained even when the inside of the refrigerator is not sufficiently cold since the previous cooking has finished and not much time has passed.

Further, in the invention according to claim 8, when the temperature inside the chamber immediately after ignition is equal to or higher than a predetermined temperature, the control unit controls the temperature inside the chamber which has been measured by the measuring means last time and has risen for a certain period of time. It is set to control using the standard internal temperature that rises in a certain time when there is no previous data used, so in case of high temperature cooking etc. It is possible to control so that the amount of heat is accurate even when the inside of the refrigerator is not sufficiently cooled after the elapse of time.

[Brief description of drawings]

FIG. 1 is a schematic overall configuration diagram of the present invention.

FIG. 2 is a schematic side sectional view showing an example of an oven used in the present invention.

FIG. 3 is a schematic front sectional view of the above.

FIG. 4 is a schematic plan sectional view of the above.

FIG. 5 is a block circuit diagram of the present invention.

FIG. 6 is a sectional view showing a proportional flow control valve used in the above.

FIG. 7 is a graph showing the relationship between the control current and the amount of heat (input) of the proportional flow control valve of the same.

FIG. 8 is a graph showing the relationship between the control current of the proportional flow rate control valve and the time required for raising the temperature.

FIG. 9 is a graph showing the relationship between the heat quantity (input) and the internal cold storage temperature at the combustion limit.

FIG. 10 is a graph for obtaining the control current value of the proportional flow rate control valve based on the above-mentioned reference formula and the measurement time.

FIG. 11 is a graph showing the relationship between the control current of the proportional flow rate control valve and the temperature rise for a certain period of time.

[Explanation of symbols]

 101 Measuring Means 102 Flow Control Valve 102a Proportional Flow Control Valve 104 Control Section 105 Abnormality Output Section

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Takashi Matsumoto 1-52, Minami-shi, Minato-ku, Osaka 1-52 Harman Co., Ltd. (72) Hideki Matsubara 4-1-2, Hirano-cho, Chuo-ku, Osaka Osaka tile (72) Inventor Tomohiro Kitamoto 4-1-2 Hirano-cho, Chuo-ku, Osaka City Osaka Gas Co., Ltd.

Claims (8)

[Claims] 1. A measuring means for measuring the temperature rising rate of the internal temperature, a flow rate control valve for adjusting the gas flow rate, and a temperature rising rate measured by the measuring means under the condition that the gas flow rate is constant. A gas appliance comprising a control unit for adjusting a gas flow rate by a flow rate control valve based on the amount of heat used. 2. The flow control valve is a proportional flow control valve,
The gas appliance according to claim 1, wherein the control unit adjusts the gas flow rate by correcting the correlation between the amount of heat used and the control current value of the proportional flow rate control valve. 3. The method according to claim 1 or 2, wherein the rate of rise of the temperature inside the chamber measured by the measuring means is obtained in the time required for the temperature inside the chamber to rise to a certain temperature. Gas appliances described. 4. The gas appliance according to claim 1 or 2, wherein the rate of increase of the temperature inside the chamber measured by the measuring means is obtained by the temperature inside the chamber increased during a certain period of time. 5. The control section is provided with an abnormality output section for judging that there is an abnormality and shutting off the gas to give an alarm when the time required for the internal temperature to rise to a certain temperature exceeds the preset time. The gas appliance according to claim 3, wherein the gas appliance is a gas appliance. 6. The control section is provided with an abnormality output section for judging that there is an abnormality and shutting off the gas to give an alarm when the internal cold room temperature that has risen during a certain period of time is outside the set temperature. The gas appliance according to claim 4. 7. The control unit uses the time required for the internal temperature measured by the measuring unit to rise a certain temperature when the internal temperature immediately after ignition is equal to or higher than a predetermined temperature, and the previous data is used. The gas appliance according to claim 3, wherein when there is no gas, the temperature is controlled so as to be controlled using a standard time required for the internal temperature to rise to a certain temperature. 8. The control unit uses the temperature inside the chamber immediately after ignition at a predetermined temperature or higher, when the temperature inside the chamber immediately after ignition is equal to or higher than a predetermined temperature. The gas appliance according to claim 4, wherein the gas appliance is set so as to be controlled by using a standard internal chamber temperature which rises in a certain period of time.