JPH08320149A - One-boiler two-water passage type bath heater - Google Patents

Abstract

PURPOSE: To perform an automatic supplmenting of calorie and to enable hot water to be fed at a predetermined set hot water feeding temperature by a method wherein there is provided a controller in which a continuous operation is carried out under a proportional control having a feed-back control added to a feed-foward control and as a total calorie becomes lower than a reference calorie, a combustion is stopped. CONSTITUTION: An one-boiler two-water passage type heat exchanging boiler 10 is provided with an additional heating circulation circuit 30 extending from a bath tub 20 and a hot water feeding circuit 40 for supplying tap water. In the case that a hot water feeding operation and a bath additional heating operation are carried out concurrently, a controller 60 adds a predetermined bath side virtual feed-forward calorie to a hot water feeding side feed-forward calorie calculated for the hot water feeding operation. In this way, the feed-forward total calorie becomes more than a reference calorie and then a continuous combustion controlling operation under a proportional control having the feed-forward control added with the feed-back control is started. Then, as the total calorie of the feed-forward calorie and the feed-back calorie becomes lower than a reference calorie, the controller 60 is operated so as to terminate the combustion only for that period.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a one-can, two-fluid type bath kettle device capable of performing both a bath reheating operation and a general hot water supply operation by one heat exchange can body.

[0002]

2. Description of the Related Art Conventionally, in a one-can-two-channel type bath kettle device capable of performing both a bath reheating operation and a general hot water supply operation with a single heat exchange can body, when the general hot water supply operation is performed, the hot water supply temperature is Is set, the required combustion heat quantity is calculated from the incoming water temperature, the incoming water flow rate, and the set hot water supply temperature, and this is used as the feedforward heat quantity, and it is determined whether or not this is a predetermined reference heat quantity or more. In the case of, the continuous combustion control operation by the proportional control in which the feedback control is added to the feedforward control is performed, and in the case of less than, the on / off combustion control operation by only the feedforward control is performed to supply hot water of a predetermined set hot water temperature Was doing.

[0003]

However, in the above-mentioned conventional apparatus, when the bath reheating operation is simultaneously performed during the general hot water supply operation, the amount of heat generated in the one-can-two-channel heat exchange can body is also on the bath reheating side. Since the water is consumed, it greatly affects the heat exchange on the general hot water supply side depending on the temperature and circulation amount of the bath water, especially when the general hot water supply operation is the on-off combustion control operation using only feedforward control. However, since the heat quantity is not replenished by the feedback control, there is a problem that general hot water cannot be supplied at a predetermined set hot water supply temperature.

Therefore, the present invention solves the above-mentioned drawbacks of the conventional device, and makes it possible to perform heating by heating the bath and heating by supplying hot water in general.
In the 1-can / 2-channel canal bath boiler device that is also used as the can-2 canal-type heat exchange can body, even when the bath reheating operation is performed at the same time as the general hot-water supply operation, the general hot water supply is set to the predetermined set hot water supply. The object is to provide a device that can be operated at temperature.

[0005]

In order to achieve the above object, a one-can-two-channel type bath kettle device of the present invention is a hot water supply for heating water from a reheating circulation circuit for bath reheating and water supply. It is equipped with a one-can two-fluid heat exchange can body that heats and heats by exchanging heat with two burners for both circuits and one circuit. For hot water supply independent operation, bath heating only operation, and hot water supply operation and bath heating operation. In the case of a 1-can / 2-fluid bathtub device capable of simultaneous operation, in the case of hot water supply only operation, feedback control is added to the feedforward control when the calculated feedforward calorific value is a certain reference calorific value or more. In addition to performing continuous combustion control operation by proportional control,
When the calculated feedforward calorific value is less than the reference calorific value, the on-off combustion control operation is performed only by the feedforward control. On the other hand, in the simultaneous operation of the hot water supply operation and the bath reheating operation, the hot water supply side feedforward is performed. Continuous combustion control operation by proportional control in which feedback control is added to feedforward control so that the total feedforward heat amount is always equal to or greater than the reference heat amount by adding a predetermined fixed bath-side virtual feedforward heat amount to the heat amount. And a controller for stopping combustion only when the total heat amount of the feedforward heat amount and the feedback heat amount becomes less than the reference heat amount.

[0006]

According to the above feature of the present invention, when the hot water supply operation and the bath reheating operation are in the simultaneous operation state, the controller is
The bath-side virtual feed-forward calorie is added to the hot-water supply-side feed-forward calorie calculated for hot water supply. As a result, the total feedforward calorific value always becomes equal to or higher than the reference calorific value, so that continuous combustion control operation by proportional control in which feedback control is added to feedforward control is started. Therefore, even if the amount of heat is taken to the bath reheating side by the simultaneous operation of the hot water supply operation and the bath reheating operation, the amount of heat is compensated by the feedback control, and hot water can be supplied at a predetermined set hot water temperature. In addition, when the total heat amount of the feedforward heat amount and the feedback heat amount becomes less than the reference heat amount during operation, by stopping combustion only during that time, hot water supply at a low set hot water temperature that cannot be achieved in continuous combustion control operation is also included. It can be done reliably. As described above, even when the hot water supply operation is combined with the bath reheating operation to be the simultaneous operation, the hot water can be reliably supplied at the set temperature with respect to the set hot water supply temperature from a high temperature to a low temperature.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on embodiments.
FIG. 1 is an overall configuration diagram of a one-can, two-channel type bath kettle device of the present invention,
FIG. 2 is a flow chart for explaining the operation control mechanism by the controller.

In FIG. 1, the apparatus is equipped with a one-can, two-fluid type heat exchange can body 10, into which the reheating circulation circuit 30 from a bath 20 and water from the water supply are heated and supplied. A hot water supply circuit 40 and is introduced. The 1-can / 2-fluid heat exchange can body
Reference numeral 10 denotes a burner 11, a blower 12 for supplying air to the burner 11, an igniter 13, two pumps P for supplying fuel such as oil, an injector IJ arranged between them, a bypass valve SV, and the like. A fuel supply means 14 consisting of is provided, and the heating of the water guided through the reheating circulation circuit 30 and the heating of the water guided through the hot water supply circuit 40 are both performed in the can body 10 1. Two heat exchange parts 15 are provided. A circulating metal fitting 21 is provided on the lower side of the bathtub 20, and a reheating circulation circuit 30 is extended from the circulating metal fitting 21 to the can body 10.

The reheating circulation circuit 30 has a circulation outward path 31 from the bath 20 to the can body 10 and a circulation return path 32 from the can body 10 to the bath body 20.
The circulation outward path 31 is provided with a circulation pump 33, a water flow switch 34, and a bath temperature sensor 35 on the can body 10 side of the three-way valve 52, and a bath water level sensor 36 on the bath 20 side of the three-way valve 52. Has been. The bath water level sensor 36 detects the water level by capturing the water pressure applied according to the bath water level. The hot water supply circuit 40
Includes a water inlet 41, a hot water outlet 42, a general hot water supply passage 43 branched from the hot water outlet 42, an automatic bath hot water supply passage 50, and a bypass passage 45 bypassing the water inlet 41 to the hot water outlet 42. The bypass passage 45 is provided with a flow rate adjusting valve 45a for adjusting the bypass flow rate. A water amount sensor 41a and a water inlet temperature sensor 41b are provided in the water inlet passage 41 at a position downstream of a branch point of the bypass passage 45. The hot water outlet 42 is provided with a hot water temperature sensor 42a, a hot water supply temperature sensor 42b, and an overflow preventer 42c at a position downstream of the connection point of the bypass 45. The bath automatic hot water supply passage 50 has a three-way valve at its tip.
It is connected to the circulation outward path 31 of the reheating circulation circuit 30 via 52. The automatic bath hot water supply passage 50 is provided with a water amount sensor 53, a drop valve 54, and a drop hopper 55. The controller 60 has a built-in microcomputer, receives information from sensors of each part of the device, and based on a command from the remote controller 70, performs a predetermined calculation and determination according to a control program, and issues a predetermined operation command to each part of the device. .

Next, an operation control mechanism by the controller 60 will be described with reference to the flowchart of FIG. Now, when the operation switch of the bath hook device itself (not shown) is turned on, the hot water supply operation is not performed (the water amount sensor 41a of the water inlet 41 is less than the minimum operating water amount (MOQ)) (S1). No), on the other hand, the circulation pump 33 is driven by turning on a bath reheating switch (not shown),
When the water flow switch 34 of the reheating circulation circuit 30 is turned on (Yes in S2), the bath alone operation is performed (S
3). In the bath alone operation, the controller 60 burns the burner 11 with a certain amount of heat and circulates the bath water by the circulation pump 33 to the heat exchange section 15 of the one-can two-fluid heat exchange can body 10 to heat it. Then, when the bath temperature sensor 35 reaches the set bath temperature, the operation is stopped. On the other hand, the water amount sensor of the water inlet passage 41 is opened by opening the hot water supply lantern (not shown) such as the general hot water passage 43
When 41a detects the minimum operating water volume (MOQ) or more (Yes in S1), while the bath reheating switch is off (water volume switch 34 is off (No in S4)),
The hot water is operated independently. In the hot water supply independent operation, the controller 60 calculates the required combustion heat quantity from the water temperature of the water temperature sensor 41b, the water flow rate of the water quantity sensor 41a, the set hot water temperature, etc., and uses this as the feedforward heat quantity, which is a predetermined constant value. It is determined whether or not it is equal to or higher than the reference calorific value. If it is more than the above, continuous combustion control operation is performed by proportional control with feedback control added to feedforward control. . The temperature of the hot water discharged from the heat exchange unit 15 to the hot water passage 42 is detected by the hot water temperature sensor 42a, and is adjusted to a predetermined set hot water supply temperature by the flow rate adjusting valve 45a. The reference calorific value is a calorific value that is predetermined in relation to the capacity of the burner 11, and at a calorific value higher than that, it is easier to control the temperature of the hot water by controlling the calorific value while continuously burning the burner 11, and the burner 11 In terms of characteristics and maintenance, the calorific value is determined in advance by experiments as a calorific value for which it is convenient to use the calorific value as the branch calorific value for continuous combustion and on-off combustion.

While the bath reheating is operating independently, the hot water supply lan (not shown) such as the general hot water supply passage 43 is opened so that the water quantity sensor 41a of the water entrance passage 41 detects the minimum operating water quantity (MOQ) or more, or during the hot water supply operation. When the bath reheating switch is turned on, the circulation pump 33 is driven, and when the water flow switch 34 is turned on (S1 is YES and S4 is YES), simultaneous hot water supply operation and bath reheating operation are performed. Become. When the simultaneous operation, the controller 60 adds a predetermined constant bath-side virtual feedforward calorific value to the calculated hot water supply side feedforward calorific value so that the total feedforward calorific value is always the reference calorific value or more,
Be sure to start continuous combustion control operation by proportional control in which feedback control is added to feedforward control (S
6).

In the embodiment, the hot water supply side feedforward heat quantity is calculated from the set hot water supply temperature, the incoming water temperature, the amount of water flowing through the heat exchange section 15, the distribution ratio of the bypass passage 45 by the flow rate control valve 45a, and the like. Based on the side feedforward heat quantity, the set can body tapping temperature to be tapped from the heat exchange section 15 is calculated. On the other hand, the burner 11 is based on the total feedforward heat quantity obtained by adding the hot water supply side feedforward heat quantity and the bath side virtual feedforward heat quantity.
The feed-forward is burnt. Heat exchange section 15 to hot water passage
The temperature of the hot water discharged to the hot water 42 is detected by the hot water temperature sensor 42a, and the hot water temperature is compared with the set can body hot water temperature (S7), and the hot water temperature is the same as the preset hot water temperature set (for example, 1 If it is not within a certain allowable temperature range within ℃ (NO in S7), the feedback heat quantity corresponding to the difference is calculated by the controller 60 (S8), and the combustion of the burner 11 is controlled by this feedback heat quantity. It By this feedback control, hot water can be supplied at a predetermined set hot water temperature during the bath reheating simultaneous operation. Then, during the simultaneous operation, the controller 60 monitors whether the total heat amount of the feedforward heat amount and the feedback heat amount is less than the reference heat amount (S
9) If the calorific value is less than the reference calorific value (Yes in S9), the combustion is stopped only during that time (S10). As a result, hot water supply at a low set hot water supply temperature, which cannot be achieved by continuous combustion control operation, can be reliably performed together.

[0013]

According to the present invention, there is provided the above construction.
According to the one-can-two-fluid type bath kettle device described in [1], when the hot water supply operation and the bath reheating operation are performed simultaneously, a predetermined constant bath-side virtual feedforward heat quantity is added to the hot-water supply side feedforward heat quantity. By doing so, the feedforward total heat amount is always equal to or higher than the reference heat amount, continuous combustion control operation is performed by proportional control in which feedback control is added to the feedforward control, and the total heat amount of the feedforward heat amount and the feedback heat amount is A controller is provided to stop combustion only when the amount of heat is less than the reference amount, so even if the amount of heat is taken to the side of the bath heating by simultaneous operation of hot water supply operation and bath heating operation, the amount of heat is automatically supplemented. Then, hot water can be supplied at a predetermined set hot water supply temperature. Moreover, when the total heat quantity of the feedforward heat quantity and the feedback heat quantity becomes less than the reference heat quantity during the simultaneous operation, the combustion is stopped only during that time, so at a low set hot water supply temperature that cannot be achieved in the continuous combustion control operation. It is possible to reliably supply hot water. As described above, even when the hot-water refueling operation is added to the hot-water reheating operation and the simultaneous operation is performed, hot water can be reliably supplied at the set temperature for a wide range of set hot water supply temperatures from a high temperature to a low temperature.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram of a one-can / two-channel type bath kettle device of the present invention.

FIG. 2 is a flowchart illustrating a driving control mechanism by a controller.

[Explanation of symbols]

 10 1 can 2 water channel type heat exchange can body 11 burner 15 heat exchange section 20 bathtub 30 reheating circulation circuit 40 hot water supply circuit 41 hot water input path 42 hot water output path 43 general hot water supply path 60 controller

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kimiaki Asano 93 No. Edo-cho, Chuo-ku, Kobe City, Hyogo Prefecture

Claims (1)

[Claims] 1. A one-can-two-channel heat system in which two circuits, a reheating circulation circuit for reheating a bath and a hot water supply circuit for heating and supplying water from water supply are combined into one burner for heat exchange heating. It is a 1-can / 2-channel bathtub device that is equipped with a replacement can and is capable of hot water supply independent operation, bath reheating operation alone, and simultaneous hot water supply and bath reheating operation. In addition, when the calculated feedforward calorific value is equal to or higher than a certain reference calorific value, the continuous combustion control operation is performed by proportional control in which the feedback control is added to the feedforward control, and the calculated feedforward calorific value is less than the reference calorific value. In the case of, on-off combustion control operation is performed only by feedforward control,
On the other hand, in the case of the simultaneous operation of the hot water supply operation and the bath reheating operation, by adding a certain fixed bath side virtual feedforward heat quantity to the hot water supply side feedforward heat quantity,
The feedforward total heat quantity is always equal to or higher than the reference heat quantity, and continuous combustion control operation is performed by proportional control in which feedback control is added to the feedforward control, and the total heat quantity of the feedforward heat quantity and the feedback heat quantity is the reference heat quantity. A one-can-two-channel bathtub device, which is provided with a controller that stops combustion only during that period.