JPH01111159A - Controller with manual setting function - Google Patents

Abstract

PURPOSE:To make is possible to conveniently use the controller even when a manual operation by the manual setting function is not performed by providing the controller with setting changing means having a fixedly setting function for setting the operational state of the apparatus without any relation with the setting condition of setting means, and switching between the fixedly setting function and the manually setting function. CONSTITUTION:In the case of using a main controller 54, a movable terminal 65 is connected to a stationary terminal 64. Since the main controller 54 arranged at a terminal 65a of the movable terminal 65 is connected to a terminal 62 of a stationary terminal 64, the main controller 54 can communicated with a CPU 70. Upon this occasion, since a setting changing circuit 63 does not actuate, a control accordance with a signal from the main controller 54 is conducted. In a case where the main controller 54 is not used, a movable terminal 68 is connected to the stationary terminal 64 in place of the movable terminal 65. A contact 66a of a changeover terminal 66 is short-circuited to a contact 66b by a short-circuiting line 69 of the movable terminal 68, and thus the setting changing circuit 63 is actuated. The CPU 70 carries out such a control to stop its analyzing function and to set a predetermined temperature.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a control device equipped with a manual setting function that allows the operating state of equipment to be set by manual operation.

[Prior Art] Equipment that is installed outdoors, such as a combustion type water heater, and that needs to be operated indoors, such as in a bathroom, is equipped with a manual setting unit that is connected, for example, with wire-saving wiring. This manual setting section is equipped with a microcomputer, and a control device included in the device analyzes a signal from the manual setting section using the microcomputer, and performs predetermined control according to the setting state.

[Problems to be Solved by the Invention] However, such equipment does not necessarily require a manual setting section; for example, in the case of a water heater, it may be used as a boiler with a constant outlet temperature. In this case, not only is there no need for a manual setting section, but instead of the manual setting section, it is necessary to switch the setting contents of the microcomputer in order to keep the setting contents such as the set temperature constant.

However, since conventional devices are based on manual settings, care must be taken not to change the settings in the manual setting section, making it difficult to use them easily. be.

An object of the present invention is to provide a control device equipped with a manual setting function for manually setting the operating state of equipment, which can be easily used even when manual operation using the manual setting function is not performed. purpose.

[Means for Solving the Problems] The present invention provides a manual connection terminal that is provided with a connection terminal for connecting a setting means for manually setting the operating state of a device, and that performs control according to the setting state of the setting means. In the control device having a setting function, the control device has a fixed setting function that sets the operating state of the device constant regardless of the setting state of the setting means, and switches between the fixed setting function and the manual setting function. The technical means is to provide a setting change means.

[Function] The control device of the present invention has a manual setting function, and the operating state of the device can be manually set by the setting means connected to the connection terminal. This control device also has a fixed setting function, and can be switched between the manual setting function and the fixed setting function by means of a setting changing means. When switched to the fixed setting function, the operating state of the device is set constant regardless of the setting state of the setting means.

[Effects of the Invention] In the control device of the present invention, when the setting change means changes to the fixed setting function, the operating state of the device is set constant regardless of the setting state of the setting means. Therefore, if the setting means is used, the setting state can be easily changed by manual operation even while the device is in use, and when the setting means is not used, the operating state of the device can be easily set to a constant value. ,
The equipment can be used easily.

Embodiment Next, the gas combustion type water heater of the present invention will be explained based on an embodiment shown in the drawings.

A combustor case 10 is provided in the water heater case 2 of the gas combustion type water heater 1 shown in FIG.
A linked burner 11 is provided. The combustor case 10 is equipped with a combustion fan 12 using a three-phase Y-connected brushless DC motor, and the burner 11 is a forced-air combustor that burns with combustion air supplied by the combustion fan 12. The combustion exhaust gas is exhausted to the outside from the exhaust port 3.

A heat exchanger 13 connected to a water supply pipe 30 is provided above the combustor case 10 , and water passing through the interior is heated by heat generated by the burner 11 .

Further, a sparker 14 as an ignition device and a flame rod 15 as a flame detection means are provided near the burner 11 in the combustor case 10. Furthermore, a temperature fuse 16 is provided above and outside the combustor case 10, and is blown when the combustor case 10 reaches a high temperature due to abnormal combustion, thereby stopping the operation of the gas-fired water heater.

The gas supply pipe 20 includes a main solenoid valve 21 that allows fuel gas to pass through when energized from the upstream side, a main solenoid valve 22, and a dual governor proportional valve 23 that adjusts the supply amount of fuel gas by controlling the supply pressure. A switching electromagnetic valve 24 is provided to cut off fuel gas to one of the burners 11 depending on the state of use, and supplies fuel gas to the burner 11 described above.

A water drain plug 32 equipped with a water filter 31 is provided at the most upstream portion of the water supply pipe 30, and a water flow control valve 33 operated by a geared motor that adjusts the amount of water flowing into the heat exchanger 13 is provided downstream thereof. The water flow control valve 33 is equipped with a potentiometer 34 for detecting the opening degree. Water flow control valve 33
The temperature of the water whose inflow amount has been adjusted is detected by the inlet water temperature thermistor 35 installed immediately downstream, and the inflow amount is further detected by the water flow sensor 36 downstream of the inflow temperature, and the water passes through the water supply pipe 30 for heat exchange. It is sent to the container 13. heat exchanger 1
3 is equipped with an emblem safety switch 37, which can be used when the timing between extinguishing the burner 11 and controlling the water in the water supply pipe 30 is not good, and the water temperature in the heat exchanger 13 rises abnormally due to embers. Stop operation.

The water supply pipe 30 on the downstream side of the heat exchanger 13 is provided with an outlet hot water temperature thermistor 38 that detects the temperature of the heated water.
Further downstream, a boil prevention switch 39 is provided.

In addition, freeze prevention heaters 40 are provided at several locations near the water supply pipe 30 inside the water heater case 2, and are energized when a low temperature is detected by the low temperature detection switch 41 inside the water heater case 2. Prevents equipment damage. Further, a pressurized safety valve 42 is installed at the most downstream side of the water supply pipe 30 in order to release water to the outside and protect the gas combustion type water heater 1 when the water pressure in the water supply pipe 30 becomes abnormally high. It is provided.

In the gas combustion water heater having the above configuration, the control device 50
controlled by

As shown in FIG. 3, the control device 50 includes a heater circuit 52 consisting of a freeze prevention heater 40 connected via a low temperature sensing switch 41 to a power cord 51 connected to an outlet of indoor wiring; The control circuit 60 is operated by the power supply section 53 connected via the residual flame safety switch 37, the temperature fuse 16, and the boil prevention switch 39. A main controller 54 is provided for manually setting the control circuit 60.

The main controller 54 is a setting means of the present invention that is operated by the user, and in this embodiment, the main controller 54 is
4 is installed in a hot water supply area such as a bathroom.

The main controller 54 is operated by power supplied from the control circuit 60, and includes an operation switch (not shown), an indicator lamp indicating that the operation switch is in operation, a water temperature setting switch for setting the water temperature, and a two-digit number indicating the set water temperature. 7 segments are provided to transmit signals according to the setting status.

This signal is a digital signal modulated by a predetermined carrier wave for wire-saving connection, and the digital full signal includes an operating signal, a set water temperature signal, a bath water temperature signal, and a timer signal in a predetermined format.

Furthermore, in the 7 segments, a pre-specified error message can be displayed when an abnormality occurs in the control circuit 60.

The control circuit 60 includes a microcomputer 70 (hereinafter referred to as C
PU70), a sparker circuit 71, a fan circuit 72, a proportional valve circuit 73, and a geared motor circuit 74
, a position detection circuit 75, and a water amount detection circuit 76, these circuits are controlled in a predetermined manner by the CPU 70.

The sparker circuit 11 causes a spark discharge to occur in the discharge gap of the sparker 14, detects the spark discharge in the discharge gap, and sends a detection signal to the microcomputer 70.

The fan circuit 72 rotates the combustion fan 12 according to the required combustion amount such as a set water temperature, detects the rotation speed from a three-phase Y-connected brushless DC motor, and sends a detection signal to the CPU 70.

The proportional valve circuit 73 is a circuit that controls the amount of electricity supplied to the governor proportional valve 23 in order to adjust the amount of fuel gas supplied so that combustion in the burner 11 is performed at a desired air-fuel ratio. The amount of current supplied is controlled based on the rotation speed of the combustion fan 12 except during ignition.

The geared motor circuit 74 is a circuit that drives a geared motor of the water flow control valve 33 for regulating the amount of water flowing into the heat exchanger 13, and opens the water flow control valve 33 according to a control signal.

The position detection circuit 75 is a circuit for analyzing a signal from the potentiometer 34 provided in the water flow control valve 33 to detect its opening degree.

The water amount detection circuit 76 detects the amount of water entering the water supply pipe 30 based on the rotation speed of the water amount sensor 36 having an impeller.

The CPU 70 has an analysis function that analyzes signals from the main controller 54, a sequence control that controls the operating order and timing of each circuit described above, and a capacity control that determines the combustion amount and amount of water based on the inlet water temperature, amount of water, and set water temperature. Feedforward control (hereinafter referred to as FF control) that controls the flow rate, feedback control (hereinafter referred to as FB control) that controls the combustion amount and water input amount based on the hot water temperature, and switching control that switches between FFM control and FB control. It also has other safety features.

The analysis function is a function of analyzing digital signals in order to perform control according to the operating state of the main controller 54.The main controller 54 is connected to a terminal 62 of a control circuit 60 as shown in FIG. 62 is a wire-saving two-wire terminal.

A terminal 62 of the control circuit 60 is provided inside the water heater case 1, and a lamp display signal and a 7-segment display signal from the CPU 70 are sequentially transmitted from this terminal 62, respectively.

Furthermore, this embodiment can be used as a water heater without manual operation without using the main controller 54, and in this case, as a means to easily change the setting state, a setting change circuit 63 that stops analysis by the analysis function is used. It is equipped with This is to perform predetermined control by the CPU 70 on the premise that there is no signal from the main controller 54, and the setting change circuit 63 which is the setting change means of the present invention
This stops the analysis function and changes the settings to a certain state.

In this embodiment, a multi-pole connector is used as the switching means and changing means for operating the setting changing circuit 63. This uses a fixed terminal 64, which is one side of a multi-pole connector, on the terminal 62 side, and a movable terminal 65, which is the other side of the multi-pole connector, on the main controller 54 side. One part is used as a terminal 62 for connecting the main controller 54, and the other part of the fixed terminal 64 is used as a switching terminal 66 as a switching means for the setting change circuit 63. And main controller 5
4, the movable terminal 65 to which the main controller 54 is connected is used so that the terminal 65a can be connected to the terminal 62, and when the main controller 54 is not used, the contact 66a of the switching terminal 66, the terminal Using the movable terminal 68 that can be short-circuited at 67, the short-circuit wire 6
I am trying to short circuit at 9. This movable terminal 68 has the same connection structure as the movable terminal 65, but since there is no need to connect a controller or the like, a type with a sealed back surface is used.

As for sequence control, when the user uses water and obtains a water flow signal based on the water flow sensor 36, the original solenoid valve 21
is opened and the combustion fan 12 is activated.
．． After 5 seconds of prepurge, ignition is performed.

In the ignition operation, the main solenoid valve 22, the governor proportional valve 23, and the sparker 14 are energized at the same time, and when ignition is detected, the combustion capacity is calculated one second later, and combustion begins according to the set amount. .

In capacity control, the most efficient combustion method is calculated from the temperature set by the main controller 54, the inlet water temperature, and the inlet water amount, and the combustion fan 12, governor proportional valve 23, switching solenoid valve 24, and water flow control valve 33 are controlled. FF control is performed to control each, and FB control is performed to detect the hot water temperature and correct the combustion amount and hot water supply amount. Normally, FF control is performed, but if a difference occurs between the hot water temperature and the set temperature, When a predetermined condition is met, the control is switched to FB control.

Further, when the main controller 54 is not used, the setting change circuit 63 controls the outlet temperature to be fixed at a predetermined temperature, and in this embodiment, it is set to either 60°C or 75°C.

As a safety function, each solenoid valve is closed and operation is stopped when the temperature of hot water reaches 105℃ or higher and continues for 3 seconds, when continuous combustion continues for 80 minutes, or when no flame is detected. Stop.

In the gas combustion type water heater 1 having the above configuration, the present invention operates as follows.

When using the main controller 54, the movable terminal 65 is connected to the fixed terminal 64. Then, the main controller 54 wired to the terminal 65a of the movable terminal 65 is connected to the terminal 62 of the fixed terminal 64, so that the main controller 54 and the CPU 70 can communicate with each other. At this time, since the setting change circuit 63 does not operate, the CPU 70
Now, control is performed according to signals from the main controller 54.

When the main controller 54 is not used, a movable terminal 68 is connected to the fixed terminal 64 instead of the movable terminal 65. Then, the contact 66a and the contact 66b of the switching terminal 66 are short-circuited by the short-circuit wire 69 of the movable terminal 68, and the setting change circuit 63 is activated by this short-circuit. Then, the CPU 70 stops the analysis function and performs control to maintain a predetermined temperature. At this time, since the CPU 70 does not perform processing for the analysis function, the load on the CPU 70 is reduced, and the
, the processing efficiency of the PU 70 can be improved.

As described above, according to the present invention, when the main controller serving as the setting means is not used, the analysis function of the CPU can be easily stopped and the control contents can be changed.

In this embodiment, in order to stop the analysis function and change the control content, the terminal 66 is connected with a shorting wire 69, but as shown in FIG. 80 may be used, a microswitch 81 may be provided in the vicinity of this connector 80, and a cap 82 that can actuate the microswitch 81 in place of the movable terminal 68 may be used for switching. Further, the microswitch 81 does not need to be provided on the same plane as the connector 80; for example, the microswitch 81 may be provided inside the case, a protrusion may be provided on the cap 82, and the microswitch 81 may be operated through a through hole. You can.

As described above, in the present invention, a certain level of control can be performed even when a manual setting means is not used. Therefore, if used as a control device for a water heater as shown in the embodiment, for example, a water heater without a controller can be used. Since the controller can be sold as a controller, the price for the controller can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram showing the main parts of an embodiment of the present invention, FIG. 2 is a schematic configuration diagram showing a gas combustion type water heater of this embodiment,
FIG. 3 is a block diagram showing the control device of this embodiment, and FIG. 4 is a schematic configuration diagram showing another embodiment of the present invention. In the figure, 54...main controller (setting means), 6
0... Control circuit (control device), 62... Terminal (connection terminal - 15 = child), 63... Setting change circuit (setting change means), 66
... switching terminal (switching means), 68... movable terminal (changing means).

Claims (1)

[Scope of Claims] 1) A control device comprising a connection terminal for connecting a setting means for manually setting the operating state of a device, and having a manual setting function to perform control according to the setting state of the setting means. In the above, the control device has a fixed setting function that sets the operating state of the device to be constant regardless of the setting state of the setting means, and includes a setting change means that switches between the fixed setting function and the manual setting function. A control device with a manual setting function featuring: 2) The setting changing means includes a switching means provided close to the connection terminal, and when the setting means is not connected, the setting changing means is fixed to the connection terminal and the switching means at the same time, so that the manual The control device with a manual setting function according to claim 1, characterized in that the setting function is switched to the fixed setting function.