JPH10227294A - Fan motor control device of hot water supply instrument - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fan motor control device of a hot water supply instrument in which the main control substrate of a hot water supply instrument can be used versatilely for the various hot water supply instruments except the hot water supply instrument of a type initially adjusting the dispersion of a data particular to an individual fan motor and the main control substrate of the hot water supply instrument does not require the replacement, when the means for carrying out the initial adjustment of the fan motor is replaced. SOLUTION: In the control device of a fan motor in a hot water supply instrument having a fan motor 20 for sending the air required in a combustion, an initial adjustment substrate 30 for inputting to the main control substrate 10 after adjusting the dispersion particular to the data of an individual fan motor 20 assembled together to the hot water supply instrument to the data under a common condition for the main control substrate 10 for controlling the fan motor 20 along with other member universally is provided as an exclusive substrate different from the main control substrate 10 and connected between the fan motor 20 and the main control substrate 10 by an electric wiring.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fan motor for a water heater.

[0002]

2. Description of the Related Art As a device for controlling a fan motor of a water heater, the applicant of the present application detects the value of the current flowing through the fan motor and the number of revolutions, and uses the current value and the number of revolutions to determine the blowing resistance of the fan motor. For example, Japanese Patent Application No. 8-71532 discloses a device that obtains an optimum rotation speed under the airflow resistance with respect to an optimum airflow amount and controls a fan motor so as to achieve the optimum rotation speed. Provided in In such a device, there is an advantage that it is not necessary to provide an air volume sensor or a wind speed sensor in the air flow path. In the device, the relationship between the rotation speed of the fan motor of the water heater and the value of the current flowing through the fan motor, for example, the relationship between the slope represented by the number of rotations / current value and the airflow resistance corresponding to the slope is determined in advance by experiments. Thus, in the actual operation, the inclination can be calculated from the detected rotation speed and the current value of the fan motor to determine the blowing resistance of the fan motor during the operation. . This airflow resistance is important, and if the airflow resistance is known, it is possible to calculate the number of rotations of the fan under the airflow resistance required to supply a required airflow, and to secure appropriate airflow. it can.

[0003]

As described above, when the ventilation resistance corresponding to the inclination is determined based on the relationship (slope) between the rotation speed of the fan motor and the current value flowing through the fan motor, the individual In the fan motor of the water heater, the same slope value must be obtained for the same blowing resistance. However, each fan motor attached to each water heater has its own variation, and even under the same blowing resistance, the above-mentioned rotation speed /
The slope of the current value does not become a constant value from the beginning, and therefore, when the device is completed or constructed, the variation in the slope due to the rotation speed of the fan motor and the current value is set as a reference airflow resistance. It is necessary to make initial adjustments so as to have a constant gradient (rotational speed / current value) corresponding to the value of (1). On the other hand, if the initial adjustment state is changed by a user or the like unnecessarily after the initial adjustment, or if only the fan motor is replaced, it is necessary to determine an accurate airflow resistance from the rotation speed of the fan motor and a gradient based on a current value. Becomes impossible. Further, the necessity of the above-mentioned initial adjustment is peculiar to a water heater of a type in which the blower resistance value is determined from the rotation speed and the current value of the fan motor, so that other than such a water heater of such a type. In the water heater, there is no need for an adjustment board or the like provided with equipment and wiring required for the initial adjustment. On the other hand, when replacing the fan motor or the like, it is necessary to replace the fan motor and the equipment and wiring etc. which have been initially adjusted together.However, the equipment and wiring for initial adjustment are configured together with the main control board of the water heater. In such a case, there is a problem that the main control board itself must be changed.

Accordingly, the present invention has been made in view of the above-mentioned problems of the conventional fan motor control device for a water heater, and has a versatility of a main control board of the water heater, that is, the main control board of the water heater has a fan motor rotation speed and current. It is necessary to replace the main control board of the water heater when replacing the means for performing the initial adjustment of the fan motor, in addition to making it possible to use it for various water heaters other than the water heater of the type that determines the blowing resistance with the value. In addition, the fan motor and the initial adjustment board, etc., which are means for initial adjustment of the variation due to the fan motor, are not separately replaced, and are used after the initial adjustment is performed. A fan motor control device for a water heater that can prevent the initial adjustment state from being changed by a person or the like. The interest.

[0005]

In order to achieve the above object, a fan motor control apparatus for a water heater according to the present invention controls a fan motor in a water heater having a fan motor for blowing air required for combustion. An apparatus, wherein under a common condition, a specific variation of data of each fan motor combined with a water heater is provided to a main control board for universally controlling the fan motor together with other members. An initial adjustment board for adjusting to the data and inputting to the main control board is provided as a dedicated board separate from the main control board, and is connected by electric wiring between the fan motor and the main control board. Is the first feature. Further, in the fan motor control device for a water heater according to the present invention, in addition to the first feature, an initial adjustment board provided as a dedicated board is provided for each fan motor combined with the water heater at a certain reference airflow resistance. A second feature is that the substrate is used for performing initial adjustment so that the relationship between the rotation speed of the fan motor and the current value becomes a predetermined constant reference value. Further, in addition to the first or second feature, the fan motor control device for a water heater according to the present invention further includes an initial adjustment board and a fan motor attached and connected, and after the initial adjustment is completed, the initial adjustment board and the fan. A third feature is that the motor and the motor cannot be replaced separately. Further, the fan motor control device of the water heater of the present invention, in addition to any one of the first to third features, attaches and connects an initial adjustment board and a fan motor,
The fourth feature is that the adjustment operation of the initial adjustment board is disabled after the initial adjustment is completed. Further, in addition to the third or fourth feature, the fan motor control device for a water heater according to the present invention may further comprise a step of binding the fan motor lead wire and the initial adjustment board with a binding band to make the fan motor inseparable. The feature is. Further, in addition to the third or fourth feature, the fan motor control device for a water heater according to the present invention does not allow the fan motor connector to be inserted into the initial adjustment board, complete the initial adjustment, and then be removed from the initial adjustment board. The sixth feature is that the cover is provided. Further, in addition to the third or fourth feature, the fan motor control device for a water heater according to the present invention further comprises inserting a fan motor connector into the initial adjustment board, completing the initial adjustment, and then molding the connector until the connector is buried. Is injected into the initial adjustment substrate.

[0006]

FIG. 1 is a schematic view showing an embodiment of a fan motor control apparatus for a water heater according to the present invention, FIG. 2 is a view of an initial adjustment board shown in FIG. FIG. 4 is a diagram for explaining initial adjustment by an initial adjustment board, and FIG. 4 is a plan view of a main part showing another embodiment of the fan motor control device for the water heater according to the present invention.

1 and 2, reference numeral 10 denotes a main control board of the water heater, 20 denotes a fan motor of the water heater, and 30 denotes an initial adjustment board. Although not shown, the water heater has at least a combustion chamber, a burner that supplies fuel to the combustion chamber to perform combustion, a heat exchanger that heats and heats water, an inlet pipe and a tap water pipe. I have. Of course, the main control board 10 that controls the entire water heater
And a fan motor 20. The main control board 10 includes:
Input the information from the sensors arranged in each part of the water heater, and by the built-in microcomputer, according to the predetermined software,
Calculation and determination are performed, and operation control is instructed to each part of the water heater. Of course, the fan motor 20 is also controlled. The fan motor 20 is provided to supply air necessary for fuel combustion by the burner of the water heater, and the main control board 10 The number of revolutions is controlled. The fan motor 20 is provided with a lead wire 21 and is connected to the initial adjustment board 30 by a connector 22 provided at the end of the lead wire 21. The initial adjustment board 30 is a dedicated board provided separately from the main control board 10 in order to perform initial adjustment of variations of the individual fan motors 20. The lead wire 11 on the 10 side is connected to the connector 12, and the connectors 31 and 34 on the base end side of the lead wire 31 are connected to the circuit of the initial adjustment board 30.
Reference numerals 35 and 36 denote a pair of volume knobs provided on the initial adjustment substrate 30 for initial adjustment. An opening (not shown) is provided at a position of the mounting case 41 of the initial adjustment board 30 which faces the volume knobs 35 and 36, and can be adjusted by a driver through this opening. After the adjustment, it is closed by the adjustment opening lid 42 so that the volume knobs 35 and 36 cannot be carelessly touched so that it cannot be removed.

When the hot water supply temperature is set, the main control board 10 calculates the required amount of combustion heat from the incoming water temperature and the incoming water flow rate, and supplies and supplies the required fuel, for example, oil fuel or gas fuel. The amount of air blown so that the optimum air-fuel ratio for the fuel to be supplied is calculated, the rotation speed of the fan motor 20 is calculated based on the calculated amount, and the feedforward control of the fan motor 20 is performed. And during combustion operation,
The current value I flowing through the fan motor 20 is detected and input to the main control board 10, and the rotation speed sensor detects the rotation speed N of the fan motor and input to the main control board 10. The main control board 10 determines the blowing resistance Φ under the condition that the combustion operation is being performed from the relationship between the input rotation speed N and the current value I, and under the condition of the blowing resistance Φ. Then, the rotational speed N of the fan motor 20 for obtaining the air blowing amount Q at which the optimum air-fuel ratio is obtained is calculated again, and the fan motor 20 is feedback-controlled so as to reach the rotational speed N.
In this manner, the control of the fan motor 20 for ensuring the air blowing amount Q that provides the optimum air-fuel ratio is performed.

[0009] The relationship between the fan motor speed N and the current value I flowing through the fan motor and the blower resistor [Phi, as shown in FIG. 3, the air blowing resistance [Phi, [Phi ₁ which for example, the fan motor speed N By plotting the relationship between the current and the current value I, a curve as shown on the right side of FIG. 3 is obtained, and the slope of the curve, roughly the slope of N / I Θ, and the constant blow resistance Φ Have been found to correspond. Therefore, by obtaining in advance the relationship between the various airflow resistances Φ and the various inclinations 対 応 corresponding to the airflow resistances by experiments or the like, during the actual combustion operation, the detected rotation speed N of the fan motor is obtained.
And the current value I, the slope Θ is calculated, whereby the blowing resistance Φ at that time can be obtained. On the other hand, as shown by the left line in FIG. 3, the relationship between the air blowing amount Q at a certain blowing resistance Φ and the rotation speed N of the fan motor can be obtained in advance by experiments or the like. Therefore, if the optimum air blowing amount Q or the like necessary for a certain combustion operation is determined, the required rotation speed N of the fan motor 20 can be obtained from the blowing resistance Φ at that time, and the fan speed is output so as to output the required rotation speed N. The motor 20 can be controlled. The relationship between the rotation speed N and the current value I corresponding to each of the airflow resistances Φ is, in addition to the above-described simple slope 前 記, a logarithmic slope, and the like.
And the current value I may be expressed by a quadratic equation. In short, the rotational speed N may be any relationship as long as the blowing resistance Φ can be obtained from the relationship of the current value I.

However, the relationship between the rotation speed N and the current value I in the fan motor 20 has a unique variation for each mounted fan motor 20. I is not detected. Therefore, when the above-described control is performed by using the fan motor 20 as a part of the water heater, a fixed current value I is detected for a certain fixed rotation speed of the fan motor 20 after the fan motor 20 is attached. It is necessary to perform the initial adjustment for all the fan motors 20 so that the fan motor 20 can be adjusted. By doing so, the relationship between the common rotation speed N and the current value I can be guaranteed in each fan motor 20 attached to each water heater, and the detected rotation speed N and current value I Therefore, the airflow resistance Φ at that time can be correctly determined. In the initial adjustment, as shown in the diagram on the right side of FIG. 3, for example, current values I _MIN and I _MAX for a certain large and small rotation speed N _MIN and N _{MAX at} a certain airflow resistance Φ.
However, the initial adjustment of the current value I is performed so that the reference value becomes a predetermined constant value. The initial adjustment is performed with the volume knobs 35 and 36 of the initial adjustment board 30.
The initial adjustment by the initial adjustment substrate 30 is performed at least after the connection combination of the fan motor 20 and the initial adjustment substrate 30 is determined, and under a constant airflow resistance Φ environment, for example, constant rotation speeds N _MIN and N _MAX , for example, 2000 revolutions and 5000
The fan motor 20 is rotated by the rotation, and the current value I detected at that time is determined by predetermined constant current values I _MIN and I _MAX
Volume knob 35 for minimum adjustment and volume knob for max adjustment, respectively.
Initial adjustment with 36. Of course, the initial adjustment is not limited to being performed at two large and small rotational speeds N _MIN and N _MAX . In short, the rotation speed N of each fan motor 20
Since the initial adjustment is performed to eliminate the variation of the current value I and the same condition and to achieve the same condition, the initial adjustment may be performed at two or more points. Initial adjustment at one point is also possible.

The initial adjustment board 30 provided with the volume knobs 35 and 36 is configured and arranged as a dedicated board separately from the main control board 10 of the water heater. The main control board
A power supply line, an auxiliary power supply line for a microcomputer, a control signal transmission line for a fan motor 20 and the like are connected from the initial adjustment board 30 to the initial adjustment board 30, and a detection current value signal transmission line and a detection speed A signal transmission line or the like is connected. From the initial adjustment board 30 to the fan motor 20,
A power supply line and a fan motor 20 control signal transmission line are connected, and from the fan motor 20, a detected current value signal transmission line and a detected rotation speed signal transmission line are connected.
Note that the detected rotation speed signal transmission line may be directly input to the main control board 10 without passing through the initial adjustment board 30.

The initial adjustment board 30 provided with the volume knobs 35 and 36 is formed separately from the main control board 10 and arranged, so that the air is blown from the rotation speed N of the fan motor 20 and the current value I. The main control board 10 can be used as a more versatile control board for general water heaters other than the water heater employing the method of determining the resistance Φ. Also, as described later, when the initial adjustment by the initial adjustment board 30 is once completed and the readjustment cannot be performed, the initial adjustment is required again after that, or when the initial adjustment board 30 is used.
Even when it is necessary to replace the main control board 10, even if it becomes necessary to replace the initial control board 30 with the fan motor 20, it is sufficient to separate the initial adjustment board 30 from the main control board 10. There is no need to replace them together.

In the present invention, the initial adjustment board 30 and the fan motor 20 are attached and connected to each other, and after the initial adjustment is completed by the initial adjustment board 30, both are not separately replaced. Also, the initial adjustment board 30
After the completion of the initial adjustment according to the above, the initial adjustment means embodied by the volume knobs 35 and 36 cannot be operated. That is, in the example shown in FIGS. 1 and 2, the lead wire 21 of the fan motor 20 and the initial adjustment board 30
Are bound by a binding band 40 so that they cannot be separated unless the initial adjustment substrate 30 is broken, so that separation is impossible.

FIG. 4 shows an initial adjustment board 30 and a fan motor 20.
It is a figure which shows other embodiment which makes it impossible to separate and replace it. In this embodiment, after the connector 22 of the fan motor 20 is inserted into the initial adjustment
50 is assembled. This makes it impossible to separate and replace the initial adjustment board 30 and the fan motor 20. Also,
After the initial adjustment by the initial adjustment board 30 is completed, it is possible to prevent a user or the like from adjusting the knobs 35 and 36 of the initial adjustment board 30.

In addition, the initial adjustment board 30 and the fan motor 20
After inserting the connector 22 of the fan motor 20 into the initial adjustment board 30 and connecting the same, the mold 22 such as resin is injected until the connector 22 is buried, and the connector 22 can be removed. The state may not be set. As means for preventing an adjustment operation by a user or the like after completion of the initial adjustment, the volume knob 3 is used.
The molding material may be injected until the volume knobs 36 are buried so that the volume knobs 35 36 cannot be touched. By making the separation and replacement of the initial adjustment board 30 and the fan motor 20 impossible, it is possible to prevent the fan motor 20 and the like from being replaced independently with the initial adjustment board 30, so that the current of the fan motor 20 that is not adjusted can be prevented. The value is prevented from being input to the main control board 10 to cause undesired results such as incomplete combustion. Also, by attaching and connecting the initial adjustment board 30 and the fan motor 20, and after completing the initial adjustment, by disabling the adjustment operation of the initial adjustment board 30,
It is prevented that the initial adjusted state is changed by the user or the like, and that an unadjusted current value of the fan motor 20 is input to the main control board 10, thereby preventing an undesirable result such as incomplete combustion. .

[0016]

According to the present invention, there is provided the above construction.
According to the water heater fan motor control device described in the above, for the main control board for universally controlling the fan motor together with other members, the characteristic of the data that each fan motor combined with the water heater has An initial adjustment board for adjusting the variation of the data to data under common conditions and inputting the data to the main control board is provided as a dedicated board separate from the main control board, and the fan motor and the main control board are The main control board can be used for general-purpose use also for water heaters of a type other than the water heater that requires initial adjustment of the variation peculiar to each fan motor because the connection is made by electric wiring therebetween. Even when the initial adjustment board needs to be replaced, it is not necessary to replace the main control board together. Also, when performing the initial adjustment, there is no need to touch the main control board or perform any operation, and it is possible to perform the operation only with the separately arranged initial adjustment board and to ensure the safety of the main control board. Can be. According to the water heater fan motor control device of the second aspect, in addition to the effects of the configuration of the first aspect, the initial adjustment substrate provided as a dedicated substrate is provided for each fan combined with the water heater. In the motor, a substrate for performing initial adjustment so that the relationship between the rotation speed of the fan motor and the current value under a certain reference airflow resistance becomes a predetermined constant reference value. The main control board can also be used as a more versatile control board for general water heaters other than those having means for determining the air flow resistance from the relationship with the current value. In addition, if the initial adjustment by the initial adjustment board is once completed and re-adjustment cannot be performed, then, if the initial adjustment becomes necessary again or if it becomes necessary to replace the initial adjustment board, By making the initial adjustment board separate from the main control board, it is sufficient to replace only the initial adjustment board together with the fan motor and the like, and it is not necessary to replace the main control board together. According to the fan motor control device of the water heater according to the third aspect, in addition to the effect of the configuration according to the first or second aspect, the initial adjustment board and the fan motor are attached and connected to complete the initial adjustment. Since the initial adjustment board and the fan motor cannot be separately replaced later, it is possible to prevent the fan motor etc. from being replaced independently from the initial adjustment board after the initial adjustment is made Therefore, it is possible to prevent an undesired result such as incomplete combustion caused by using a fan motor that has not been subjected to the initial adjustment. Further, according to the fan motor control device for a water heater according to claim 4, claim 1 or 2 is provided.
In addition to the effects of the configuration described in the above, after the initial adjustment board and fan motor are attached and connected, and after the initial adjustment is completed, the adjustment operation of the initial adjustment board is disabled, so once the initial adjustment is performed , It is possible to prevent the user from changing the initial adjusted state.
Therefore, it is possible to prevent the fan motor from returning to the state where the initial adjustment is not performed, and to cause an undesirable result such as incomplete combustion. According to the fan motor control device for a water heater according to the fifth aspect, in addition to the effect of the configuration according to the third or fourth aspect, the lead wire of the fan motor and the initial adjustment board are bound by a binding band, Since the separation is impossible, it is possible to prevent the fan motor and the initial adjustment board from being separately replaced. According to the water heater fan motor control device of the sixth aspect, in addition to the effect of the configuration of the third or fourth aspect, the fan motor connector is inserted into the initial adjustment board to complete the initial adjustment. Later, since the initial adjustment board is covered with a non-removable lid, it is possible to prevent the fan motor and the initial adjustment board from being separately replaced after the completion of the initial adjustment. Further, it is possible to prevent the initial adjustment board from being operated after the completion of the initial adjustment. According to the water heater fan motor control device of the seventh aspect, in addition to the effect of the configuration of the third or fourth aspect, the fan motor connector is inserted into the initial adjustment board to complete the initial adjustment. Thereafter, the molding material is injected into the initial adjustment board until the connector is buried, so that it is possible to prevent the fan motor and the initial adjustment board from being separately replaced after the initial adjustment is completed. Further, it is possible to prevent the initial adjustment board from being operated after the completion of the initial adjustment.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing an embodiment of a fan motor control device for a water heater according to the present invention.

FIG. 2 is a view of the initial adjustment substrate shown in FIG.

FIG. 3 is a diagram for explaining initial adjustment by an initial adjustment substrate.

FIG. 4 is a plan view of a main part showing another embodiment of the fan motor control device for the water heater according to the present invention.

[Explanation of symbols]

 10 Main control board 20 Fan motor 21 Lead wire 22 Connector 30 Initial adjustment board 31 Lead wire 32 Connector 33 Connector 34 Connector 35 Volume knob 36 Volume knob 40 Cable band 50 Lid

Continued on the front page (72) Inventor Hiroki Ohara 93, Edo-cho, Chuo-ku, Kobe-shi, Hyogo Pref.

Claims (7)

[Claims] 1. A control device for a fan motor in a water heater having a fan motor for blowing air required for combustion, the main control board being configured to universally control the fan motor together with other members. On the other hand, an initial adjustment board for adjusting a unique variation of data possessed by individual fan motors combined with the water heater to data under common conditions and inputting the adjusted data to the main control board is provided by the main control board. A fan motor control device for a water heater, wherein the fan motor control device is provided as a dedicated board separate from the board, and is connected by electric wiring between the fan motor and a main control board. 2. An initial adjustment board provided as a dedicated board is provided in each fan motor combined with a water heater, in which a relationship between a rotation speed of the fan motor and a current value under a certain reference blowing resistance is predetermined. 2. The fan motor control device for a water heater according to claim 1, wherein the substrate is a substrate for performing an initial adjustment so as to be a reference value. 3. The method according to claim 1, wherein the initial adjustment board and the fan motor are attached and connected to each other, and after the initial adjustment is completed, the initial adjustment board and the fan motor cannot be replaced separately. Fan motor control device for water heater. 4. The fan for a water heater according to claim 1, wherein the initial adjustment board and the fan motor are attached and connected, and after the initial adjustment is completed, the adjustment operation of the initial adjustment board is disabled. Motor control device. 5. The fan motor control device for a water heater according to claim 3, wherein a lead wire of the fan motor and the initial adjustment board are bound by a binding band so that they cannot be separated. 6. The fan motor control for a water heater according to claim 3, wherein the connector of the fan motor is inserted into the initial adjustment board, and after the initial adjustment is completed, the initial adjustment board is covered with a non-removable lid. apparatus. 7. The method according to claim 3, wherein the connector of the fan motor is inserted into the initial adjustment board, and after the initial adjustment is completed, a molding material is injected into the initial adjustment board until the connector is buried.
Or the fan motor control device of the water heater according to 4.