JP2917288B2 - Oil hot water heater - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an instantaneous oil hot water supply apparatus.

(Prior art) Conventionally, in a petroleum water heater that burns oil to supply hot water, intermittent combustion that repeats combustion and digestion by turning on and off an on-off valve provided in an electromagnetic pump that pumps oil to an injection nozzle. A mixing unit is provided in a tapping path for adjusting a tapping temperature to a desired tapping temperature and mitigating an excessive fluctuation of the tapping temperature, and an instantaneous hot water supply device that mixes hot water to reach a set temperature and then taps, and hot water storage. A hot-water supply type hot-water supply system that maintains the hot-water temperature of the hot-water storage unit at a predetermined temperature by intermittent combustion that repeats combustion and digestion by turning on and off an on-off valve provided in an electromagnetic pump that pumps oil to the injection nozzle while supplying oil to the injection nozzle Devices are known.

(Problems to be Solved by the Invention) In the instantaneous petroleum hot water supply device provided with a mixing section described in the related art, fluctuations in the tapping temperature of the mixing section provided in the tapping path after the tapping is performed at an appropriate temperature. The problem is that noise and odor are generated due to the ON-OFF of combustion, and the temperature of hot water in the hot water tank at the time of startup of the device does not rise easily, and the safety of the hot water storage section From the above point of view, the set pressure of the pressure reducing valve and the safety valve is kept below a predetermined value, so the supply of hot water to the upper floor and the flow rate of the shower are insufficient, and the noise and odor accompanying the ON-OFF of combustion occurs, and There was a problem that an installation space for the hot water storage unit was required.

The present invention has been made in view of the above-mentioned problems of the related art, and an object thereof is to continuously change a spray amount from a fuel injection nozzle to reduce a hot water amount and a hot water temperature. Provide an instantaneous oil hot water supply device that can continuously control the corresponding amount of combustion within a predetermined range to maintain the tap water temperature at a set temperature, and does not require a mixing unit or a hot water storage unit and is a compact water supply direct pressure. It is assumed that.

(Means for Solving the Problems) In order to solve the above problems, the control means of the instantaneous oil hot water supply device according to the present invention calculates a required heat load from a set temperature, a feed water temperature and a water amount, and outputs a tap water temperature and a set temperature. The modified heat load is calculated from the difference between the two, and the flow control valve is controlled based on a value obtained by adding the modified heat load to the required heat load.

(Operation) The control means of the instantaneous oil hot water supply device according to the present invention calculates the required heat load from the set temperature, the supply water temperature, and the water amount, and calculates the corrected heat load from the difference between the tapping temperature and the set temperature, thereby obtaining the required heat load. Since the flow rate control valve is controlled based on the value obtained by adding the corrected heat load to the load, the return flow rate can be controlled to continuously vary the spray amount of the fuel oil.

(Example) Hereinafter, an example of the present invention will be described with reference to the accompanying drawings.

FIG. 1 is a conceptual explanatory view of the configuration of an instantaneous oil hot water supply apparatus according to the present invention.

In the oil instantaneous water heater 1, the oil is stored in the fuel tank 2.
From the oil supply pipe 3 and the fuel injection means 4 to the water heater main body 5 where it is burned, and water is sent via the water supply pipe 6 to the heat exchanger 7 disposed in the water heater main body 5. Then, it is heated and supplied to a faucet, bathtub and the like (not shown) through the hot water supply pipe 8.

The water supply pipe 6 is provided with a water amount sensor 11 and a water supply temperature sensor 12 which are means for detecting a water supply amount and a water supply temperature.
Is provided with a tapping temperature sensor 13 as a tapping temperature detecting means and a water quantity valve 14 for adjusting the tapping quantity.

The water amount sensor 11, the supply water temperature sensor 12, the tap water temperature sensor 13, and the water amount valve 14 are electrically connected to the input / output interface 16 of the control means 15, respectively.

The control means 15 includes an input / output interface 16, a microprocessor (MPL) 17, and a memory 18 including a ROM and a RAM.

Further, the fuel injection means 4 for continuously changing the spray amount
Is a fuel injection nozzle 21 and a fuel tank 2
And a flow control valve 24 provided in a return circuit 23 from the nozzle 21.

The flow control valve 24 is provided with a needle 25 as shown in FIG.
Is controlled by the microactuator 26 to proportionally control the opening area of the return circuit 23 to control the return flow rate. Incidentally, reference numeral 28 denotes an inlet connected to the return circuit 23, and reference numeral 29 denotes an outlet connected to the tank 2.

Then, the electromagnetic pump 22, the microactuator 26,
The position sensors 27 for detecting the positions of the needles 25 are connected to the input / output interface 16, respectively.

Further, as the fuel injection nozzle 21, a patent application (Japanese Patent Application No. 63-281618, Japanese Patent Application No. 1-37088)
No.) can be applied. That is, as shown in FIG. 4, there is provided a fixed needle 70 fixed so that the flow rate to the return circuit 23 is maximized, or at a position eccentric from the center axis 81 of the distributor 80 as shown in FIG. The one provided with a return hole 82 is applied to control of a wide flow rate adjustment range.

By applying this nozzle, the entrainment of air into the return flow is eliminated, and the spray amount can be proportionally controlled, thereby enabling an instantaneous refueling machine and, consequently, arithmetic control such as feed forward. It is what it was. Further, the nozzle 21 is provided with an intake fan motor 31 for supplying air necessary for oil combustion to the combustion chamber 30 and this fan motor.
A burner 34 is constituted by a burner cylinder 33 formed so as to surround the tip of the nozzle 21 by being connected to a fan cover 32 that encloses 31. An ignition electrode 35 is provided between the nozzle 21 and the burner cylinder 33 so as to face the tip of the nozzle 21, and the ignition transformer 36 of the electrode 35 is subjected to ignition control via the input / output interface 16. In addition, a combustion sensing sensor 37 using a light sensing element such as CdS or a thermosensitive element such as a thermocouple.
Are provided near the nozzle 21 and connected to the input / output interface 16 in the same manner as the fan motor 31.

Also, a remote controller connected to the control means 15
40 includes a power switch 41, a power indicator lamp 42, a combustion indicator lamp 44, a temperature setting switch 43, a fuel tank liquid level indicator lamp 45, and the like.

The temperature setting switch 43 corresponds to a means for setting a set temperature in the claims.

The memory 18 constituting the control means 15 includes a water amount sensor 11,
Based on output signals from the feedwater temperature sensor 12, the hot water temperature sensor 13, the position sensor 27, and the like, and the set temperature inputted by the temperature setting switch 43 of the remote controller 40, the water quantity valve 14, the electromagnetic pump 22, the microactuator 26
A temperature control program for driving is stored.

Therefore, when the power switch 41 is turned on, the power indicator lamp 42
Lights up, and output signals from the sensors 11, 12, 13, 27 are input to the MPU 17 via the input / output interface 16. Then, the temperature control program stored in the memory 18 is read out to the MPU 17 and executed.

The operation of the instant oil-type hot water supply device configured as described above will be described below with reference to the flowchart of FIG.

First, in step S1, the power switch 41 of the controller 40 is
Is turned on, the power lamp 42 is turned on in step S2, and the water amount valve 14 is rotated until it is fully opened.

In step S3, when it is determined that the hot water tap (not shown) provided on the hot water supply pipe 8 is "open", the process proceeds to step S4, where the hot water tap is opened to supply water to the water supply temperature sensor 12, Water amount sensor 11, heat exchanger 7, tap water temperature sensor 1
3. Exit the water tap through the water valve 14.

In step S4, the required heat load is calculated from the detection values of the water amount sensor 11 and the feedwater temperature sensor 12 and the set temperature preset by the temperature setting switch 43 of the controller 40. For example, required heat load = (set temperature−supply water temperature) × water quantity.

In step S5, when the calculation result of the required heat load exceeds a predetermined value, the hot water supply apparatus 1 starts operating, and the air supply fan motor
The rotation of the combustion chamber 31 is started for a predetermined time. At this time, the fan motor 31 rotates at a slow air flow corresponding to a slow ignition operation described below, regardless of the required load.

In step S6, the water amount is reduced for a predetermined time so that the water amount valve 14 increases the tapping temperature quickly.

When the air flow sensor (not shown) does not detect the rotation speed of the gentle air flow, the subsequent operation is stopped.

In step S7, when the prepurge for a predetermined time is completed, the discharge starts continuously from the electrode bar 35 for ignition, the operation of the electromagnetic pump 22 is started, and the on-off valve (not shown) provided on the electromagnetic pump 22 is opened, The fuel is started from the injection nozzle 21 and ignites. At this time, the flow control valve 24 of the return circuit 23 drives the needle 25 to the gentle ignition position by the microactuator 26 so that the fuel is injected most easily and the combustion noise is also small. This is the mild ignition operation.

In step S8, when the combustion sensor 37 detects a flame, the process proceeds to step S9, where the discharge of the electrode rod 35 stops, and the combustion lamp 44 is turned on.

On the other hand, when the flame cannot be detected within a predetermined time after the electromagnetic pump 22 is operated, the number of times of the adhered fire is determined in step S15, and if it is the first time, the process proceeds to step S6. Proceeding to step S16, the operation of the electromagnetic pump 22 is stopped, the on-off valve provided for the electromagnetic pump 22 is closed, and the electrode
The discharge of 35 is stopped, and the subsequent operations are stopped. At this time, the combustion lamp 44 is flashed to notify that it is abnormal. Further, proceeding to step S14, the air supply fan motor 31 performs a post-purge operation for a predetermined time and then stops.

In step S10, a corrected heat load (calculated from the difference between the tapping temperature detected by tapping temperature sensor 13 and the set temperature set by controller 40) is added to the required heat load a predetermined time after ignition, and the correction is made in step S11. The needle 25 of the flow control valve 24 and the rotation speed of the fan motor 31 are moved to the position. At this time, the water quantity valve 14 moves to the fully open position when the required heat load is less than the maximum output (for example, about No. 20), and moves to the maximum output position (the water quantity position where the output becomes about No. 20) when the required heat load is more than the maximum output. .

If the rotation speed of the fan motor 31 does not reach the specified rotation speed within a predetermined time, the subsequent operation is stopped.

Further, if the water supply amount or the set temperature is changed during use, the required heat load is constantly calculated, so the control of steps S10 to S11 is performed at the moment of the change.

In step S12, it is determined whether or not the hot water tap is `` closed ''. If it is not closed, the process proceeds to step S10, and if it is determined that it is closed, the process proceeds to step S13 to stop the electromagnetic pump 22, and the combustion lamp 44 is turned off. I do.

Then, in step S14, the air supply fan motor 31 performs a post-purge operation for a predetermined time and then stops.

Further, even during hot water supply, the flow rate is reduced to the water flow valve 14 by calculating and judging from the water supply amount, the water supply temperature, the set temperature, and the maximum capacity of the hot water supply device 1 so that the water does not flow beyond the limit water supply amount at the set temperature. The signal is output from the MPU 17.

FIG. 7 is a flowchart showing step S1 of the flowchart shown in FIG.
9 is a flowchart illustrating a case where feedforward control and feedback control are performed for 0 to S12.

First, in step S100, the set temperature T _S , the feed water temperature
The spray amount is calculated from T _W and the water supply amount Q.

In step S101, a drive signal corresponding to the spray amount is output to the microactuator 26 of the flow control valve 24, and the needle 25 is driven to control the spray amount and burn, and the hot water temperature T via the heat exchanger 7. _M quickly sets temperature T _S
Feedforward control is performed so as to match.

In step S102, a difference between tapping temperature T _M and set temperature T _S △
It is determined whether T is equal to or smaller than a predetermined value. If T is equal to or smaller than the predetermined value, the process proceeds to step S104, and if not, the process proceeds to step S103.

In step S103, a control operation is selected according to the magnitude and the manner of change of the deviation ΔT, the spray amount is calculated according to the control operation, and a drive signal corresponding to the spray amount is transmitted to the flow control valve.
The output is output to the microactuator 26 of 24, and the needle 25 is driven to control the amount of spray to burn, and the feedback control for making the tapping temperature T _M coincide with the set temperature T _S via the heat exchanger 7 is continued.

In step S104, it is determined whether or not the hot water tap is "closed". If it is not closed, the process proceeds to step S100, and if it is determined that it is closed, the process proceeds to the next step.

FIG. 8 shows a flowchart in the case where so-called learning control is performed for steps S10 to S12 of the flowchart shown in FIG.

First, in step S200, the water supply amount Q and the water supply temperature T _W
Then, the required spray amount is calculated at the set temperature T _S.

In step S201, a drive signal corresponding to the calculated spray amount is calculated from the relationship between the spray amount set in the memory 18 and the position of the needle 25, and is output to the microactuator 26 to drive the needle 25 to spray. The amount is controlled to burn, and the tapping temperature T _M is brought close to the set temperature T _S via the heat exchanger 7.

Next, in step S202, it is determined whether or not the deviation between the set temperature T _S and the tapping temperature T _M is within a predetermined temperature A ° C. If it is determined that the temperature is within A ° C., the process proceeds to step S206.

In step S203, the feedwater temperature T _{W is set} . A control operation is selected according to the magnitude of the deviation between the set temperature T _S and the tapping temperature T _M while taking the water supply amount Q into consideration, and the corrected spray amount is calculated according to the control operation.

Then, in step S204, a drive signal corresponding to the calculated corrected spray amount is output to the microactuator 26,
By driving the needle 25, the spray amount is controlled and burned, and the tapping temperature T _M approaches the set temperature T _S via the heat exchanger 7.

Next, in step S205, it is determined whether the deviation between the set temperature T _S and the tapping temperature T _M is within a predetermined temperature A ° C., and if it is determined that the deviation is not within the predetermined temperature A ° C., the process proceeds to step S203. If it is determined that the temperature is within the predetermined temperature A ° C., the process proceeds to step S206.

In step S206, the output value of the position sensor 27 and the corresponding corrected spray amount calculated in step S203 are stored in the memory.
Remember at 18.

Then, in step S207, it is determined whether or not the hot water tap is "closed". If it is not closed, the process proceeds to step S202, and if it is determined that it is closed, the process proceeds to the next step.

In this embodiment, a needle type valve is shown as the flow control valve. However, as shown in FIG.
0 may be used. The electromagnetic pressure control valve 300 is configured such that a valve body 301 made of a steel ball is pressed against a valve seat 304 by a pressing bush 303 made of a magnetic material biased by a spring 302 to close a passage 305. And the pressing bush 30 of the magnetic material
The magnitude of the current flowing through the coil 306 wound with a gap provided in 3 is adjusted, and the pressing bush 303 resists the pressing force of the spring 302 in accordance with the strength of the magnetic field generated in the coil 306 in proportion to this current. And adjusts the pressure between the valve body 301 and the valve seat 304 in proportion to the current. 307 is an entrance and 308 is an exit. It should be noted that a spherical valve type electromagnetic pressure control valve has the advantage that the hysteresis is small and the combustion amount can be kept constant as compared with the elastic valve, and that the performance can be maintained without being corroded by kerosene and water in kerosene. Having. FIG. 2 shows a fuel injection means 50 having a different structure from the fuel injection means 4 in FIG.

The fuel injection means 50 includes a fuel injection nozzle 51 and this nozzle
An electromagnetic pump 52 for supplying oil from the fuel tank 2 to 51,
And a return circuit 53 from the nozzle 51.

As the nozzle 51, the one proposed in the patent application (Japanese Patent Application No. 63-281617, Japanese Patent Application No. Hei 1-37088) filed by the patent applicant can be applied. That is, as shown in FIG. 10, the fuel injection nozzle 51 is provided with a needle 54 forming a return hole at a position eccentric from the center axis of the distributor 60 so as to advance and retreat to adjust the return hole flow area.
It comprises a micro-actuator 55 for driving 54 and a position sensor 56 (not shown in FIG. 10) for detecting the position of the needle. The electromagnetic pump 52, the microactuator 55, and the position sensor 56 are connected to the input / output interface 16, respectively.

Therefore, output signals from the sensors 11, 12, 13, and 56 are input to the MPU 17 via the input / output interface 16, and are stored in the memory 18 according to the temperature control program shown in the flowchart of FIGS. The control of the outlet temperature to the set temperature is the same as the case where the fuel injection means 4 shown in FIG. 1 is used.

In FIG. 10, 61 is an orifice disk, 62 is a fuel inlet, and 63 is a return port.

Further, instead of the water supply amount sensor 11, a water supply switch (which detects the flow of water and checks whether the water heater is in a movable state) may be provided.

(Effect of the Invention) The control unit of the instantaneous oil hot water supply device according to the present invention calculates the required heat load from the set temperature, the supply water temperature and the water amount, and calculates the corrected heat load from the difference between the tapping temperature and the set temperature, The flow rate control valve is controlled based on the value obtained by adding the corrected heat load to the required heat load, and the return flow rate is controlled to continuously vary the spray amount of the fuel oil. It is possible to quickly match and maintain the set temperature.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating the conceptual configuration of an instantaneous oil hot water supply apparatus according to the present invention, FIG. 2 is a diagram illustrating the conceptual configuration of a fuel injection unit having a configuration different from that shown in FIG. 1, and FIG. FIG. 4 is a cross-sectional view of a fixed needle injection nozzle, FIG. 5 is a vertical cross-sectional view of a main part and a plan view of a main part of the injection nozzle, FIGS.
FIG. 8 is a flowchart, FIG. 9 is a sectional view of an electromagnetic pressure control valve, and FIG. 10 is a sectional view of a needle-driven fuel injection nozzle. In the drawings, 1 is an instantaneous oil hot water supply device, 4 and 50 are fuel injection means, 11 is a water amount sensor, 12 is a water supply temperature sensor, 13 is a tap water temperature sensor, 14 is a water amount valve, 15 is a control means, and 21 and 51 is a fuel injection nozzle, 23 is a return circuit, 24 is a flow control nozzle, and 25 and 54 are needles.

──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Hajime Miyazaki 2-81-1, Honmura, Chigasaki-shi, Kanagawa Prefecture Tochiki Kikai Co., Ltd. Chigasaki Factory (72) Ryosuke Hayashi 2-81-1, Honmura, Chigasaki-shi, Kanagawa Prefecture No. Tochi Kiki Co., Ltd. Chigasaki Plant (72) Inventor Joe Nakamura 2-81-1, Honmura, Chigasaki City, Kanagawa Prefecture Toto Koki Co., Ltd. Chigasaki Plant (72) Inventor Masato Arimatsu 2-chome Honmura, Chigasaki City, Kanagawa Prefecture No. 1 Tochiki Kikai Co., Ltd. Chigasaki Plant (56) References JP-A-2-37212 (JP, A) JP-A-63-148050 (JP, A) JP-A 64-5053 (JP, U) 63-168758 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) F23N 1/00 F23N 5/02 F24H 1/10

Claims (1)

(57) [Claims] 1. A feed water temperature sensor for detecting a feed water temperature, a tap water temperature sensor for detecting a tap water temperature, a water quantity temperature sensor for detecting a water quantity, a means for setting a set temperature, and adjusting an oil quantity flowing to a return circuit. An oil instantaneous hot water supply device comprising: a flow control valve for controlling the operation of the control device; and a control unit that calculates a required heat load from a set temperature, a supply water temperature, and a water amount, and discharges the hot water. An oil instantaneous hot water supply apparatus, wherein a corrected heat load is calculated from a difference between the temperature and a set temperature, and the flow control valve is controlled based on a value obtained by adding the corrected heat load to the required heat load.