JP2523728Y2 - Pulse combustion type flyer device - Google Patents

Description

[Detailed Description of the Invention] (Industrial application field) The present invention provides a function to prevent empty burning, that is, pulse combustion when the oil level in the heating tank falls below the vicinity of the upper surface of the combustion chamber and the tail pipe of the pulse combustor. The present invention relates to a pulse combustion type fryer device having a function of stopping the operation of a vessel.

(Prior art) The pipe combustion type fryer apparatus is provided with a combustion chamber and a tail pipe of a pulse combustor inside a heating tank, and heats oil such as tempura oil stored in the heating tank by the pulse combustor. However, the conventional one does not have a function to automatically prevent dry burning. Conventionally, at the time of starting, a user confirms that there is oil of a predetermined level or more in a heating tank, and then activates a pulse combustor to prevent dry burning.

(Problems to be Solved by the Invention) In such a conventional technique, if the user fails to confirm, there is a case where the pulse combustor is operated in a state where there is no oil or in a state of being equal to or lower than a predetermined level to perform idling. In addition, there is a possibility that the appliance may be damaged due to overheating of the pulse combustor. In order to prevent such a problem, it is conceivable to provide a liquid level detection switch in the heating tank so that the pulse combustor does not operate when the oil level is lower than a predetermined level. There is a problem that the cost of the device increases because a switch is newly required.

This type of pulse combustion type fryer device has a temperature sensor for detecting the temperature of oil contained in a heating tank, but the inventor and the like detected the temperature sensor when the pulse combustor was operating. The rate of temperature increase
When the oil contained in the heating tank was higher than the temperature sensor level, it was relatively large, but when there was only oil below that level, it was noticeably smaller. Based on this phenomenon, the present invention uses a temperature sensor that detects the temperature of the oil stored in the heating tank, and has a function to prevent empty heating, which does not increase the cost of the equipment particularly compared to the past. It is an object of the present invention to provide a pulse combustion type fryer device.

(Means for Solving the Problems) To this end, the pulse combustion type fryer according to the present invention comprises a box-shaped heating tank 10 having an open top, a combustion chamber 21 and an outlet thereof, as shown in FIG. A pulse combustor 20 having a tail pipe 22 having one end connected to the heating tank 10 and a temperature sensor 15 for detecting the temperature of oil contained in the heating tank; In a pulse combustion type fryer device comprising a fuel control means 1 for opening and closing an electromagnetic valve 33 provided in a fuel supply passage 31 of a heating device 20, a temperature rise rate detection for detecting a temperature rise rate detected by the temperature sensor 15 Means 2 for storing a predetermined reference rate of temperature rise and a reference rate-of-increase storage means 3 for storing a predetermined reference rate of temperature rise.
15 is attached to the heating tank 10 at a position away from the attachment position of the pulse combustor 20 to the heating tank 10 and at a height near the upper surface of the combustion chamber 21 and the tail pipe 22; The control means 1 compares the detected temperature rise rate detected by the temperature rise rate detection means 2 with the reference temperature rise rate, and when the detected temperature rise rate is smaller, closes the solenoid valve 33 and opens the pulse combustor. It is characterized by shutting off fuel to 20.

(Operation) The temperature rise rate detecting means 2 reads the temperature detected by the temperature sensor 15 a plurality of times and detects the temperature rise rate. The fuel control means 1 compares the detected temperature rise rate with the reference temperature rise rate stored in the reference rise rate storage means 3, and closes the main solenoid valve 33 when the detected temperature rise rate is smaller, and when not, Keeps the main solenoid valve 33 as it is. Heating tank
If there is oil in the level of the temperature sensor 15 or higher located at the height near the upper surface of the combustion chamber 21 and the tail pipe 22 in 10, the detected temperature rise rate is large, and is larger than the reference temperature rise rate. The main solenoid valve 33 is kept in that state, and the pulse combustion type fryer device operates normally. Heating tank
If there is only oil within the combustion chamber 21 and the level below the temperature sensor 15 located near the upper surfaces of the tail pipes 22 in the combustion chamber 10, the detected temperature rise rate is small and becomes smaller than the reference temperature rise rate. Is closed, and the pulse combustor 20 stops operating.

(Effects of the Invention) As described above, according to the present invention, when the oil level in the heating tank is lower than the vicinity of the upper surfaces of the combustion chamber and the tail pipe, the pulse combustor stops operating. In any case, overheating of the pulse combustor due to the air burning is prevented. In addition, since a temperature sensor for detecting the temperature of the oil contained in the heating tank is used, it is not necessary to newly provide a sensor for detecting empty heating, and the cost of the apparatus does not increase.

(Embodiment) FIGS. 2 to 4 show an embodiment of the present invention in a fryer used for cooking fried foods using oil.

As shown in FIGS. 2 and 3, the pulse combustor 20 includes a combustion chamber 21, a tail pipe 22, and a mixing chamber 23 as main components, and the combustion chamber 21 and the tail pipe 22 are provided at a lower portion in the heating tank 10. Have been. The combustion chamber 21 is air-tightly screwed and fixed to the inner surface of the front wall 10a of the box-shaped heating tank 10 having an open upper surface via a gasket by a flange portion 21a formed on one side thereof. One end of the tail pipe 22 is hermetically welded and fixed to the outlet of the combustion chamber 21 and arranged in a loop in the heating tank 10.
The other end is hermetically welded and fixed to the flange portion 21a (see FIG. 3), and an extension pipe 25 fixed to the outer surface of the front wall 10a of the heating tank 10.
The exhaust gas is discharged into the atmosphere via a muffler (not shown).

The mixing chamber 23 has a combustion chamber with one side wall 1a of the heating tank 10 interposed therebetween.
The interior of both chambers 21 and 23 is communicated via an opening (not shown) provided in the flange 21a. The combustion chamber 21 has a flange portion 21a and a front wall 10a.
Plug 16 and frame rod that penetrate through and protrude inside
17 are provided. Inside the rear wall 10b of the heating tank 10 located on the side opposite to the front wall 10a where the flange portion 21a of the combustion chamber 21 is attached, a thermistor for detecting the oil temperature of the tempura oil or the like accommodated in the heating tank 10 is provided. A temperature sensor 15 is provided. As shown in FIG. 2, the temperature sensor 15 has a height substantially in the vicinity of the upper surfaces of the combustion chamber 21 and the tail pipe 22 of the pulse combustor 20, and the mounting position of the pulse combustor 20, that is, the heating tank. It is attached to the heating tank 10 at a position away from the attachment position of the combustion chamber 21 and the tail pipe 22 with respect to 10, so that heat from the pulse combustor 20 is not directly transmitted to the temperature sensor 15 through the wall of the heating tank 10. ing. Second
The two-dot chain lines indicated by reference numerals H and L in the figure indicate the highest level and the lowest level of the oil contained in the heating tank 10, and the position of the lowest level L is a position slightly higher than the pulse combustor 20 and the temperature sensor 15. It is in.

An air chamber 11 that tightly covers the mixing chamber 23 is fixed to the outer surface of the front wall 10a of the heating tank 10, and air from an electric fan 13 such as a sirocco fan is supplied into the air chamber 11 via an air supply muffler 12. One side of the mixing chamber 23 is provided with a flapper valve (not shown) for sucking the air. A gas solenoid valve 32 is provided in a gas chamber 30 provided in the air chamber 11.
A fuel gas is supplied from a gas supply pipe 31 having a main electromagnetic valve 33 and penetrating the peripheral wall of the air chamber 11 in an airtight manner. The gas is supplied to a communication pipe 34 having a built-in flapper valve (not shown).
Through the mixing chamber 23. The source solenoid valve 32 and the main solenoid valve 33 are both solenoid valves that open and close only.

The electronic control device 40 for operating the pulse combustion fryer of the present embodiment includes a central processing unit (CPU), a read-only memory (ROM), a writable memory (RAM), and an interface. Drive units 42 to 44 for operating the electric fan 13, the main solenoid valve 32, and the main solenoid valve 33 via the interface are connected,
Further, an ignition device 45 for igniting the air-fuel mixture in the combustion chamber 10 by the ignition plug 16 is connected. Further, the CPU is provided with a remote controller 41 provided with an operation switch for starting and stopping the pulse combustion fryer via an interface, a temperature setting switch (both not shown), and the like, and the combustion chamber 21 by a frame rod 17.
Flame detection device 46 for detecting the presence or absence of a flame in the tank, and a temperature detection device for detecting the oil temperature in the heating tank 10 by the temperature sensor 15.
47 is connected.

The ROM of the electronic control unit 40 stores a control program and various constants necessary for controlling the operation of the pulse combustion fryer, and the RAM stores various variables. Based on the control program, the CPU of the electronic control unit 40 inputs signals from the remote controller 41 and the respective sensors 15, 17 and performs predetermined calculations, and executes the respective electromagnetic valves 32, 33, the fan 13, the ignition device, and the like. It controls the operation of the pulse combustion fryer by outputting to 45 and so on.

FIG. 4 shows a flowchart of the control program, which explains the operation of the present embodiment.

Turn on the operation switch of the remote controller 41 and turn on the electronic control unit 41
Is activated, the CPU resets each variable to 0 or a predetermined initial value, and starts a control operation according to this control program. CPU reads the initial temperature h ₀ detected by the temperature sensor 15 at a step 100, following step 10
The oil temperature is compared with the lower limit value H ₁ (for example, 170 ° C.) set in step ₁ . Control operation except when an immediately stop and restart non h ₀ <H ₁ proceeds to step 102 to 104, CPU activates the electric fan 13, after pre-purge for a predetermined time (e.g. 80 seconds), based on the solenoid valve Open ignition valve 32 and main solenoid valve 33
By operating 45, the operation of the pulse combustor 20 is started. In the following step 105, the CPU detects the presence or absence of a flame in the combustion chamber 21 with the frame rod 17, and confirms the operation of the pulse combustor 20.

If the flame is not detected within the predetermined time in step 105, the control operation proceeds to steps 130 and 131,
Closes the solenoid valves 32 and 33, stops the ignition device 45, and returns to step 103 to repeat the ignition operation up to three times when no flame is detected.
3. Stop the operation, stop the operation of the pulse combustion fryer by displaying an abnormality with a lamp, buzzer, etc.

When the pulse combustor 20 starts operating, the oil in the heating tank 10 is heated and the temperature gradually increases. The temperature rise rate per unit time, that is, the temperature rise rate varies depending on the oil amount and the oil temperature. For example, the oil amount is 18 to 10 liters (corresponding to the highest level H and the lowest level L in FIG. 2) and the heating capacity is 10,000 kal / hour. ,
The temperature rise rate for a fryer with a maximum temperature of 200 ° C is 5
It does not fall below ℃ / min. On the other hand, if there is no oil in the heating tank 10, that is,
The temperatures of the 20 combustion chambers 21 and the tail pipe 22 rise rapidly. However, since the attachment part of the combustion chamber 21 and the tail pipe 22 to the heating tank 10 and the attachment part of the temperature sensor 15 are separated from each other, the rate of temperature rise of the temperature detected by the temperature sensor 15 is small. It does not fall below ℃ / min.

Now, if a flame is detected in step 105, the CPU
Advances the control operation to steps 110 to 113, stops the ignition device 16 and the electric fan 13, reads the temperature h detected by the temperature sensor 15 after a unit time T (for example, one minute) from the flame detection, and in the subsequent step 114 the elevated temperature h-h ₀ per unit time is compared with the reference temperature rise H ₀ per unit time stored in the ROM. Reference temperature rise per unit time
H ₀ is set to a value (5 ° C. in the above example) which does not become lower when oil is present in the heating tank 10 and does not exceed the oil burning. The reference rise temperature H ₀ does not necessarily need to be a single value, and may be a plurality of values that decrease in accordance with the rise in the initial temperature h ₀ detected by the temperature sensor 15.

If there is oil in the heating tank 10 at a level equal to or higher than the temperature sensor 15 located at a height near the upper surfaces of the combustion chamber 21 and the tail pipe 22, the CPU performs the control operation in step 1 because h−h ₀ > H _0.
The process proceeds from step 14 to steps 120 and 121, and the temperature h detected by the temperature sensor 15 is set to the upper limit H _{2 of the} set oil temperature (for example, 18
And until 0 ° C.) actuates the pulse combustor 20 oil was heated, closes both solenoid valves 32, 33 in step 123 if the temperature h is the upper limit value H ₂ or more, stops the pulse combustor 20 To return the control operation to step 100. And temperature sensor 15
Initial temperature h ₀ is activated pulse combustor 20 in the same manner again as described above if the lower limit H ₁ less oil temperature, some of the oil overshoot Although there are within the heating chamber 10 by repeating this sensed by temperature is maintained substantially between the lower limit value H ₁ and the upper limit value H _2.

If there is only oil at a level equal to or lower than the temperature sensor 15 located at a height near the upper surfaces of the combustion chamber 21 and the tail pipe 22 in the heating tank 10, h−h ₀ > H ₀ is not satisfied in step 114, so the CPU The control operation proceeds to steps 125 and 126, where both the electromagnetic valves 32 and 33 are closed to stop the pulse combustor 20, an abnormality is displayed and the operation of the fryer is stopped. Also, the oil in the heating tank gradually decreases during use of this fryer,
If the oil level in the tank approaches an empty firing state where the oil level becomes lower than the vicinity of the upper surfaces of the combustion chamber 21 and the tail pipe 22, the temperature detected by the temperature sensor 15 at the time of the repetitive operation of the pulse combustor 20 for maintaining the oil temperature. Is decreased and h−h ₀ > H ₀ is not satisfied, and an abnormality is displayed in the same manner as described above to stop the operation of the fryer.

As described above, according to the present embodiment, the combustion chamber
If there is only oil at a level lower than the temperature sensor 15 located at a height near the upper surface of the tail pipe 21 and the tail pipe 22, the pulse combustor 20 stops operating.
Overheating of 20 is prevented at least partially. There is no possibility that the combustion chamber 21 and a part of the tail pipe 22 are exposed on the oil surface and are overheated to ignite the oil. In addition, since the idle heating is detected by the temperature sensor 15 for detecting the oil temperature, no special sensor is required, and the cost of the appliance does not increase.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of a pulse combustion type fryer device according to the present invention, FIGS. 2 to 4 show an embodiment of the present invention, FIG. 2 is an overall view showing a schematic structure, FIG. FIG. 4 is a plan view of the heating tank of FIG. 2 and its vicinity, and FIG. 4 is a flowchart of a control program. DESCRIPTION OF SYMBOLS 1 ... fuel control means 2 ... temperature rise rate detecting means 3 ... reference rise rate storage means 10 ... heating tank 15 ... temperature sensor 20 ... pulse burner 21 ... combustion chamber 22 tail pipe , 31: fuel supply path (gas supply pipe), 33: solenoid valve (main solenoid valve).

 ──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Mitsutoshi Kimura 6-23, Taoyuan-cho, Mizuho-ku, Nagoya City, Aichi Prefecture Paloma Industry Co., Ltd. Technology Department (56) References 58-49721 (JP, Y2)

Claims (1)

(57) [Scope of request for utility model registration] 1. A box-shaped heating tank having an open upper surface, a pulse combustor provided at a lower portion in the heating tank and having a tail pipe having one end communicating with a combustion chamber and an outlet thereof; A pulse combustion type fryer device comprising: a temperature sensor for detecting the temperature of oil contained in the inside; and a fuel control means for opening and closing an electromagnetic valve provided in a fuel supply path of the pulse combustor. Temperature rising rate detecting means for detecting a rising rate of the temperature, and reference rising rate storing means for storing a predetermined reference temperature rising rate, wherein the temperature sensor is attached to the heating tank of the pulse combustor. The fuel tank is attached to the heating tank at a position at a height away from the position and near the upper surface of the combustion chamber and the tail pipe, and the fuel control means detects the detected temperature detected by the temperature rise rate detecting means. Increase rate and the reference temperature when rising rate smaller for detecting the temperature rise rate than the pulse combustion fryer apparatus characterized by blocking the fuel to the pulse combustor closing the solenoid valve.