JPH02263011A - Instantaneous hot water maker with kerosene fuel - Google Patents

Abstract

PURPOSE:To make it possible to maintain the temperature of discharged hot water at a specified temperature by performing a specified calculation with a detection quantity detected by a temperature detection device and a set temperature and providing a controller which outputs the amount of operation to a fuel injection device. CONSTITUTION:In a supply water pipe 6, a water volume sensor 11 which is a detection device for the temperature of the supplied water and a supplied water temperature sensor 12 are provided, and in a supply hot water pipe 8a discharged hot water temperature sensor 13 which is a detection device for the discharged hot water temperature and a water volume valve 14 which adjusts the volume of the discharged hot water are provided respectively. A control device 15 calculates a required thermal load from the detection values of the water volume sensor 11 and supplied water temperature sensor 12 and a set temperature which is beforehand set by the temperature setting switch 43 of a controller 40. Further, when a certain time has elapsed after ignition, a corrected thermal load (calculated from the difference between the detected discharged hot water temperature detected by the discharged hot water temperature sensor 13 and the set temperature set by the controller 40) is added to the required thermal load, and the needle 25 of the flow rate control valve 24 and the rotational speed of a fan motor 31 are shifted to the corrected position. At this time the water volume valve 14 moves to the full open position when the required thermal load is below the maximum output and moves to the position of the maximum output when it is over the maximum output.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to an oil instantaneous water heater.

(Prior art) Conventionally, in petroleum water heaters that supply hot water by burning petroleum, intermittent combustion is used to repeat combustion and extinguishing by turning ON and OFF an on-off valve provided in an electromagnetic pump that pumps petroleum to an injection nozzle. In order to adjust the hot water temperature to a desired hot water temperature and to alleviate excessive fluctuations in hot water temperature, a mixing section is provided in the hot water outlet path, and an instant hot water heater that mixes hot water to bring it close to a set temperature before discharging hot water, and a hot water storage section. A hot water storage type water heater that maintains the hot water temperature in the hot water storage section at a predetermined temperature through intermittent combustion that repeats combustion and extinguishing by turning ON and OFF the on-off valve provided in the electromagnetic pump that pumps petroleum to the injection nozzle. It has been known.

(Problems to be Solved by the Invention) In oil instantaneous water heaters equipped with a mixing section as described in the prior art, although the mixing section provided in the hot water outlet path produces hot water at an appropriate temperature, the hot water temperature fluctuates. cannot be completely prevented,
There are problems with the noise and odor that occur when combustion turns on and off, and with hot water storage type water heaters, the temperature of the water in the hot water tank does not rise easily when the device is started up. Since the set pressure of the safety valve is kept below a predetermined value, it is insufficient to supply hot water to the upper floors and ensure the flow rate for showers, and noise and odors occur due to the ON/OFF switching of combustion. The problem was that it was necessary.

The present invention has been made in view of the problems of the conventional technology, and its purpose is to continuously change the amount of spray from a fuel injection nozzle to adjust the amount and temperature of hot water. To provide a compact petroleum instantaneous water heater that can continuously control the amount of combustion within a predetermined range to maintain the hot water outlet temperature at a set temperature, does not require a mixing section or a hot water storage section, and is compact and uses direct water pressure. That is.

(Means for Solving the Problems) In order to solve the above problems, the present invention includes a temperature detection means for detecting the water supply temperature and/or the outlet temperature, a fuel injection means for continuously varying the amount of fuel oil sprayed, A control means is provided which performs a predetermined calculation based on the detected amount detected by the temperature detection means and the set temperature, and outputs a manipulated variable to the fuel injection means.

It also includes a water supply amount detection means, a temperature detection means for detecting the temperature of the water supply and/or the temperature of hot water discharged, a water flow valve that adjusts the amount of hot water discharged, a fuel injection means that continuously varies the amount of fuel oil sprayed, It is also possible to provide a control means that performs a predetermined calculation based on the detection amount detected by the detection means and the set temperature, and outputs a manipulated variable to the water flow valve and the fuel injection means.

Further, the fuel injection means is formed by a fuel injection nozzle and a return circuit, and the return flow rate can be controlled by a flow rate control valve provided in the return circuit.

Furthermore, the fuel injection means may be formed by a fuel injection nozzle and a return circuit, and the distribution amount of the injection amount and return flow rate may be controlled by a distribution control valve provided in the fuel injection nozzle.

(Function) The present invention configured as described above performs a predetermined calculation in the control means using the supply water temperature detected by the temperature detection means and/or the hot water temperature and the set temperature, and calculates the operation amount based on the calculation result. A spray amount of fuel oil is outputted to a fuel injection means that continuously varies, thereby controlling the outlet temperature to a set temperature.

Furthermore, by providing the water supply amount detection means and the water amount valve, it is possible to control the hot water temperature to a set temperature and also control the amount of hot water.

Furthermore, the amount of fuel oil sprayed can be continuously varied by controlling the return flow rate with a flow rate control valve provided in the return circuit.

Further, the amount of fuel oil sprayed can be continuously varied by controlling the distribution amount of the injection N amount and the return flow rate by a distribution control valve provided on the fuel injection nozzle.

(Example) Embodiments of the present invention will be described below based on the accompanying drawings.

FIG. 1 is a conceptual diagram illustrating the construction of an oil instantaneous water heater according to the present invention.

In the petroleum instant water heater 1, petroleum is supplied from the fuel tank 2 to the water heater main body 5 via the petroleum supply pipe 3 and fuel injection means 4.
The water is sent to the water supply pipe 6 and burned there, and the water is sent via the water supply pipe 6 to the heat exchanger 7 disposed inside the water heater main body 5, where it is heated and passed through the hot water supply pipe 8 to a water faucet (not shown). , bathtubs, etc.

The water supply pipe 6 is provided with a water flow sensor 11 and a water supply temperature sensor 12, which are means for detecting the amount of water supplied and the temperature of the water supplied, and the hot water supply pipe 8 is provided with a hot water temperature sensor 13, which is a means for detecting the hot water temperature, and adjusts the amount of hot water. Water volume valves 14 are provided respectively.

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

The control means 15 includes an input/output interface 16, a microprocessor (MPU) 17, a ROM, and an R
The memory 18 is composed of an AM and a memory 18.

Further, the fuel injection means 4 that continuously changes the amount of spray,
A fuel injection nozzle 21 and a fuel tank 2 are attached to this nozzle 21.
It consists of an electromagnetic pump 22 that supplies oil from the nozzle 21, and a flow rate control valve 24 provided in a return circuit 23 from the nozzle 21.

The flow control valve 24 is connected to the needle 2 as shown in FIG.
5 is driven by a microactuator 26 to proportionally control the opening area of the return circuit 23 and thereby control the return flow rate. Note that 28 is an inlet connected to the return circuit 23, 29 is an outlet connected to the tank 2, and a position sensor 27 that detects the positions of the electromagnetic pump 22, microactuator 26, and needle 25.
are each connected to the output interface 16.

Further, as the fuel injection nozzle 21, the one proposed in the patent application previously filed by the patent applicant (Japanese Patent Application No. 1+3-281618, Japanese Patent Application No. 1-37088) can be applied. That is, as shown in FIG. 4, the fixed needle 0 is fixed so that the flow rate to the return circuit 23 is maximized, or the distributor 80 is located eccentrically from the central axis 81 as shown in FIG. A type with a return hole 82 provided in the flow rate is applicable to control over a wide flow rate adjustment range.

Further, the nozzle 21 is connected to an air supply fan motor 31 for supplying the air necessary for combustion of oil to the combustion chamber 30 and a fan cover 32 that covers the fan motor 31 so as to surround the tip of the nozzle 21. A burner 34 is constituted by a burner cylinder 33 formed in the above. An ignition electrode rod 35 is provided between the nozzle 21 and the burner cylinder 33 and facing the tip of the nozzle 21, and the ignition transformer 36 of the electrode rod 35 is controlled to ignite via the human output interface 16. Further, a combustion detection sensor 37 using a photo-sensing element such as CdS or a heat-sensitive element such as a thermocouple is provided near the nozzle 21, and is connected to the human output interface 16 similarly to the fan motor 31.

Further, the remote controller 40 connected to the control means 15 is equipped with 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 45, and the like.

The memory 18 constituting the control means 15 includes a water amount sensor 1.
1. Output signals from the water supply temperature sensor 12, hot water temperature sensor 13, position sensor 27, etc., and the remote controller 4
A temperature control program for driving the water flow valve 14, the electromagnetic pump 22, and the microactuator 26 based on the set temperature input by the temperature setting switch 43 of 0 is stored.

Therefore, when the power switch 41 is turned on, the power indicator lamp 4
2 lights up, and the output signals from each sensor 1112.13.27 are sent to the MP via the input/output interface 16.
Manpower will be provided by U17. Then, the temperature control program stored in the memory 18 is read out by the MPU 17 and executed.

The operation of the oil instantaneous water heater constructed as described above will be explained below according to the flowchart shown in FIG.

First, in step S1, when the power switch 41 of the controller 40 is set to ``one person'', the power lamp 42 is turned on in step S2.
turns on until the water volume valve 14 is fully open.

In step S3, if it is determined that the hot water tap (not shown) provided in the hot water supply pipe 8 is "open", the process proceeds to step S4. When the hot water tap is opened, water passes through the water supply temperature sensor 12, the water amount sensor 11, the heat exchanger 7, the hot water outlet temperature sensor 13, and the water amount valve 14, and exits from the hot water tap.

In step S4, the water amount sensor 11, the water supply temperature sensor 1
2 detected value and temperature setting switch 43 of controller 40
The required heat load is calculated from the set temperature set in advance. For example, required heat load = (set temperature - water supply temperature) x amount of water.

In step S5, when the calculation result of the required heat load exceeds a predetermined value, the water heater 1 starts operating, the air supply fan motor 31 starts rotating, and the combustion chamber 30 is buri-purged for a predetermined period of time. At this time, the fan motor 31 rotates at a slow air flow rate corresponding to a slow ignition operation, which will be described later, regardless of the required load.

In step S6, the water amount valve 14 reduces the amount of water for a predetermined time in order to quickly raise the temperature of the hot water.

Furthermore, when the air volume sensor (not shown) does not detect the rotational speed at a slow air volume, the subsequent operation is stopped.

In step S7, when the pre-purge for a predetermined period of time is completed, discharge starts continuously from the electrode rod 35 for ignition, the operation of the electromagnetic pump 22 is started, and an on-off valve (not shown) provided in the electromagnetic pump 22 is opened. Combustion injection is started from the injection nozzle 21 and ignition occurs. At this time, the return circuit 23
The flow rate control valve 24 drives the needle 25 to the slow ignition position using the microactuator 26 so that the amount of fuel injected is most easily ignited and the combustion noise is small. This is slow 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 is stopped and the combustion lamp 44 is turned on.

On the other hand, if a flame cannot be detected within a predetermined time after the electromagnetic pump 22 is activated, it is determined in step sis how many times the misfire has occurred, and if it is the first time, the process advances to step S6, and 1
If it is not the first time, the process advances to step S16 and the electromagnetic pump 22
The operation of the electromagnetic pump 22 is stopped, the on-off valve provided in the electromagnetic pump 22 is closed, the discharge of the electrode rod 35 is stopped, and the subsequent operation is stopped.

At this time, the combustion lamp 44 is blinked to notify that there is an abnormality. Furthermore, the process proceeds to step S14, where the air supply fan motor 31 performs a boss purge operation for a predetermined period of time, and then stops.

In step SIO, after a predetermined time after ignition, a corrected heat load (calculated from the difference between the hot water temperature detected by the hot water temperature sensor 13 and the set temperature set by the controller 40) is added to the required heat load, and the corrected heat load is added in step S11. The needle 25 of the flow rate control valve 24 and the rotation speed of the fan motor 31 are moved to this position. At this time, the water flow valve 14 moves to the fully open position if the required heat load is less than the maximum output (e.g. equivalent to about No. 20), and moves to the maximum output position (the water flow position where the output is about No. 20) if it is greater than the maximum output. .

Note that 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.

Furthermore, if the amount of water supplied or the set temperature is changed during use, the required heat load is constantly calculated, so the control in step 5IO-311 is performed the moment the change occurs.

In step S12, it is determined whether the hot water tap is "closed" or not, and if it is not closed, the process proceeds to step SIO, and if it is determined that it is closed, the process proceeds to step S13 and the electromagnetic pump 22 is stopped.
The combustion lamp 44 goes out.

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

In addition, even during hot water dispensing, the water flow is reduced to the water flow valve 14 based on calculations and judgments based on the water supply amount, water supply temperature, set temperature, and maximum capacity of the hot water supply device 1, so that water does not flow in excess of the limit water supply amount at the set temperature. A signal is output from the MPU 17.

FIG. 7 shows step 81 of the flowchart shown in FIG.
0 to S12, a flowchart is shown when feedforward control and feedback control are performed.

First, in step S100, the spray amount is calculated from the set temperature Ts, the water supply temperature Tw, and the water supply amount Q.

In step 5101, a drive signal corresponding to the amount of spray is output to the flow rate control valve 240 microactuator 26, and the needle 25 is driven to control the amount of spray to cause combustion, and the temperature of the outlet water is increased via the heat exchanger 7. Feedforward control is performed so that TM quickly matches the set temperature TS.

In step 5102, it is determined whether the deviation T between the tapped water temperature TM and the set temperature Ts is less than or equal to a predetermined value, and if it is less than or equal to the predetermined value, the process proceeds to step 5104, and if it is not less than the predetermined value, the process proceeds to step 5103.

In step $103, a control operation is selected according to the magnitude of the deviation T and the manner of change, a spray amount is calculated according to this control operation, and a drive signal corresponding to the spray amount is sent to the microactuator 26 of the flow rate control valve 24. By driving the needle 25, the spray amount is controlled and combusted, and feedback control is continued to make the outlet temperature TM match the set temperature T via the heat exchanger 7.

In step 5104, it is determined whether the hot water tap is "closed", and if it is not closed, the process proceeds to step 5100, and if it is determined that it is closed, the process proceeds to the next step.

Moreover, FIG. 8 shows a flowchart when so-called learning control is performed regarding steps 310 to S12 of the flowchart shown in FIG.

First, in step 5200, the required spray amount is calculated using the water supply amount Q, the water supply temperature Tw, and the set temperature Ts.

In step S201, the drive signal corresponding to the calculated spray amount is combined with the spray amount set in the memory 18 and the needle 2.
It is calculated from the relationship with position 5 and output to the micro-actuator 26, and by driving the needle 25, the amount of spray is controlled and combusted, and the outlet temperature TM is determined via the heat exchanger 7.
is brought closer to the set temperature Ts.

Next, in step 5202, the set temperature Ts and the hot water temperature Ty
It is determined whether the deviation from the temperature is within a predetermined temperature At or not.
If it is determined that the temperature is within the predetermined temperature A°C, the process proceeds to step 520.
Proceed to step 6.

In step 5203, a control operation is selected according to the magnitude of the deviation between the set temperature Ts and the hot water temperature TM and the manner of change, taking into account the water supply temperature Tw and the water supply amount Q, and the corrected spray amount is determined according to this control operation. Calculated.

Then, in step 5204, a drive signal corresponding to the corrected spray amount calculated is output to the microactuator 26, and the needle 25 is driven to control the spray amount and burn it, and the outlet temperature TM is changed via the heat exchanger 7. Bring the temperature close to the set temperature T.

Next, in step 5205, the set temperature Ts and the outlet temperature TM
Determine whether the deviation from the temperature is within a predetermined temperature A'C,
If it is determined that the temperature is not within the predetermined temperature At, step 52
Proceed to step 03, and if it is determined that the temperature is within the predetermined temperature At, step S
Proceed to 20B.

In step S206, the output value of the position sensor 27 and the corresponding corrected spray amount calculated in step 5203 are stored in the memory 18.

Then, in step S207, it is determined whether the hot water tap is "closed" or not. If it is not closed, the process proceeds to step 5202, and if it is determined that it is closed, the process proceeds to the next step.

In this embodiment, a needle-type flow control valve is shown, but an electromagnetic pressure control valve 30 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 magnetic pressing bush 303 biased by a spring 302 to close a flow path 305. Then, the magnitude of the current flowing through the coil 306 wound around the magnetic press bushing 303 with a gap is adjusted, and the suppression bush 303 is spring-shaped in response to the strength of the magnetic field generated in the coil 306 in proportion to this current. 302 to adjust the pressure between the valve body 301 and the valve seat 304 in proportion to the current. In addition, 307 is the entrance, 308
is the exit.

FIG. 2 shows a fuel injection means 50 having a different configuration from the fuel injection means 4 shown in FIG.

The fuel injection means 50 includes a fuel injection nozzle 51 and an electromagnetic pump 5 that supplies oil from the fuel tank 2 to the nozzle 51.
2 and a return circuit 53 from the nozzle 51.

As this nozzle 51, the one proposed in the patent application previously filed by the patent applicant (Japanese Patent Application No. 63-281817, Japanese Patent Application No. 1-37088) is applicable. That is, as shown in FIG. 10, the fuel injection nozzle 51 is provided with a needle 54 that forms a return hole at a position eccentric from the center axis of the distributor rotor 0 and is movable back and forth in order to adjust the flow path area of the return hole. A microactuator 55 that drives the needle 54 and a position sensor 56 that detects the position of the needle
(not shown in FIG. 10). The electromagnetic pump 52, microactuator 55, and position sensor 56 are each connected to the input/output interface 16.

Therefore, the output signals from each sensor 11, 12, 13.56 are input to the MPU 17 via the input/output interface 16, and the temperature control shown in the flowchart of FIG. 6.7.8 is stored in the memory 18. Controlling the outlet hot water temperature to a set temperature according to the program is the same as in the case of using the fuel injection means 4 shown in FIG. 1.

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.

(Effects of the Invention) As explained above, according to the present invention, the amount of spray from the fuel injection nozzle is continuously changed to continuously control the amount of combustion in accordance with the amount of water supply and the set temperature within a predetermined range. The hot water temperature can be quickly matched to the set temperature and maintained.

In addition, since there is no need for a hot water storage section, it is more compact, and since it is under direct pressure from the water supply, it is easier to supply hot water to upper floors.

Furthermore, by introducing a microprocessor, it becomes easier and faster to set hot water tapping conditions, improving operability and making it easier to apply various control methods.

[Brief explanation of drawings]

Fig. 1 is an explanatory conceptual diagram of the oil instantaneous water heater according to the present invention, Fig. 2 is a conceptual explanatory diagram of the fuel injection means having a different configuration from that shown in Fig. 1, and Fig. 3 is a flow Fig. 4 is a cross-sectional view of the control valve; Fig. 4 is a cross-sectional view of the fixed two-dollar injection nozzle;
The figures are a longitudinal sectional view and a plan view of the main parts of the injection nozzle, Nos. 6 to 8.
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 drawing, 1 is an oil instantaneous water heater, 4°50 is a fuel injection means, 11 is a water flow sensor, 12 is a water supply temperature sensor,
13 is a hot water temperature sensor, 14 is a water flow valve, 15 is a control means, 21.51 is a fuel injection nozzle, 23 is a return circuit, 24 is a flow rate control nozzle, and 25.54 is a needle.

Claims (4)

[Claims] (1) A temperature detection means for detecting the supply water temperature and/or the hot water temperature, a fuel injection means for continuously varying the amount of fuel oil sprayed, and a predetermined temperature based on the detected amount detected by the temperature detection means and the set temperature. 1. A petroleum instantaneous water heater, comprising: a control means for performing calculations and outputting a manipulated variable to the fuel injection means. (2) a water supply amount detection means, a temperature detection means for detecting the supply water temperature and/or the hot water outlet temperature, a water amount valve for adjusting the hot water output amount, and a fuel injection means for continuously varying the amount of fuel oil sprayed; 1. A petroleum instant water heater, comprising: a control means for performing a predetermined calculation based on the detected amount detected by the temperature detection means and the set temperature, and outputting a manipulated variable to the water flow valve and the fuel injection means. (3) The petroleum instantaneous type according to claim 1 or 2, wherein the fuel injection means is formed by a fuel injection nozzle and a return circuit, and the return flow rate is controlled by a flow rate control valve provided in the return circuit. Water heater. (4) Claim 1, wherein the fuel injection means is formed by a fuel injection nozzle and a return circuit, and controls the distribution amount of the injection amount and the return flow rate by a distribution control valve provided in the fuel injection nozzle. Or the petroleum instant water heater described in 2.