JP2018200155A - Hot water supply device - Google Patents

Abstract

To easily set an operation condition according to the presence/absence and a structure of an exhaust adaptor.SOLUTION: A controller compares load resistance of an air distribution channel obtained by converting a current value of an air supply fan with a first reference value in S2, and, if the load resistance is equal to or higher than the first reference value, determines that there is an exhaust adaptor at an exhaust port. The controller compares the load resistance with a second reference value in S3. If the load resistance is equal to or higher than the second reference value, the controller sets the number of revolutions of the air supply fan with the exhaust adaptor as type A in S4, and if the load resistance is not equal to or higher than the second reference value, the controller sets the number of revolutions of the air supply fan with the exhaust adaptor as type B in S5.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a water heater that heats water in an appliance with a burner and discharges the hot water.

When a water heater is connected to a heat exchanger heated by a burner, a water supply pipe and a hot water discharge pipe are connected, the faucet is opened and water is passed through the appliance, and the controller (operation control means) that detects this is the burner. The water passing through the heat exchanger is heated and discharged from the tapping pipe. The casing of the water heater is provided with a front cover that closes the front surface, and the combustion exhaust of the burner after heat exchange is discharged to the outside through an exhaust port provided in the front cover.
In this water heater, as disclosed in Patent Document 1, an exhaust guide cylinder (exhaust adapter) is provided on the front surface of the front cover so as to cover the exhaust port from the front and exhaust combustion exhaust from the exhaust port from different directions such as left and right. May be provided. This exhaust adapter is provided to prevent inflow of outside air, rainwater, or the like from the exhaust port, or to change the exhaust direction of the combustion exhaust.

JP2015-31496A

  When installing such a water heater, the load resistance of the air flow path changes depending on the presence or structure of the exhaust adapter, etc., so the operating conditions such as the rotation speed of the air supply fan to the burner, for example, the presence or absence of the exhaust adapter, etc. It is necessary to set together. However, since this setting is manually performed by an operator at an actual installation site, it takes time and is inconvenient.

  Then, this invention aims at providing the water heater which can set the operating condition according to the presence or absence of an exhaust adapter etc. easily.

In order to achieve the above object, the invention according to claim 1 is directed to a burner, a heat exchanger connected to a water supply pipe and a hot water discharge pipe and heated to the burner, and an air supply for supplying combustion air to the burner. A fan, an exhaust port for discharging the combustion exhaust of the burner heat-exchanged by the heat exchanger to the outside, a load resistance detection means for detecting a load resistance of the air flow path by the air supply fan, and the burner combustion and air supply fan An operation control means for controlling the rotation of the engine, and the operation control means compares the detection value of the load resistance detection means with the first reference value to determine the presence or absence of the exhaust adapter at the exhaust port, and the presence or absence of the exhaust adapter. Accordingly, the operation condition including at least the rotation speed of the air supply fan is set.
According to a second aspect of the present invention, in the configuration of the first aspect, when the operation control means determines that the exhaust adapter is present, the detected value is compared with a second reference value different from the first reference value to determine the type of the exhaust adapter. The operation condition is set according to the determined type of the exhaust adapter.
According to a third aspect of the present invention, in the configuration of the first or second aspect, the operation control means determines that the exhaust adapter is present when the detected value is equal to or greater than the first reference value for a predetermined time. And
According to a fourth aspect of the present invention, in the configuration of the second aspect, the operation control means discriminates the type of the exhaust adapter when the detected value continues to be a second reference value or more for a predetermined time. To do.

According to the first aspect of the present invention, the operation control means compares the detection value of the load resistance detection means with the first reference value to determine the presence or absence of an exhaust adapter at the exhaust port, and according to the presence or absence of the exhaust adapter. Thus, since the operating conditions including at least the rotation speed of the air supply fan are set, it is possible to automatically set the operating conditions according to the presence / absence of the exhaust adapter, and the setting of the operating conditions becomes convenient.
According to the second aspect of the present invention, in addition to the effect of the first aspect, when the operation control means determines that the exhaust adapter is present, the operation value is compared with the second reference value different from the first reference value and the exhaust control is performed. Since the type of adapter is determined and the operating condition is set according to the determined type of exhaust adapter, it is possible to set a more appropriate operating condition according to the type of exhaust adapter.
According to the third aspect of the present invention, in addition to the effect of the first or second aspect, the presence or absence of the exhaust adapter can be determined by setting the continuation of the predetermined time equal to or greater than the first reference value as a condition for determining the presence of the exhaust adapter. It can be determined more accurately.
According to the fourth aspect of the present invention, in addition to the effect of the second aspect, the exhaust adapter type can be more accurately determined by making the continuation of the predetermined time equal to or greater than the second reference value a condition for determining the exhaust adapter type. Can be determined.

It is the schematic of a water heater. It is a front view of a water heater. It is a flowchart of operation condition setting control.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic diagram showing an example of a water heater. The water heater 1 forms a combustion chamber 2 having an air supply fan 3 in a housing, and a fuel gas and an air supply are provided inside the combustion chamber 2. .. Are provided with a plurality of burners 4, 3... For burning the mixed gas with the primary air from the fan 3 (here, the combustion capacities are different from each other). 7 is provided. The gas pipe 8 to the burner 4 is provided with an original solenoid valve 9 and a gas proportional valve 10, and the switching pipes to each burner 4 branched from the gas pipe 8 are provided with switching solenoid valves 11, 11. Thus, each valve can be controlled by the controller 12 as an operation control means. 13 is an igniter, 14 is an ignition electrode, and 15 is a frame rod.

  Further, a bypass pipe 16 that bypasses the heat exchanger 5 is connected between the water supply pipe 6 and the hot water discharge pipe 7, and the water supply pipe is located upstream of the connection position of the water supply pipe 6 with the bypass pipe 16. 6 is provided with a water amount sensor 17 for detecting the amount of water flowing through 6 and a water amount servo 18 for controlling the amount of water flow, and a bypass servo 19 for controlling the amount of water to the bypass tube 16 is provided at a connection position with the bypass tube 16. Are electrically connected to the controller 12, respectively. On the other hand, the hot water outlet pipe 7 is provided with a hot water tap 20, and the temperature of hot water on the upstream side (at the outlet from the heat exchanger 5) from the connection portion with the bypass pipe 16 and the temperature of the hot water on the downstream side from the connection portion, respectively. Thermistors 21 and 22 for detection are provided and are electrically connected to the controller 12. Reference numeral 23 denotes a remote controller capable of setting the set temperature and the like.

  As shown in FIG. 2, the water heater 1 includes a housing 30 that is surrounded by five surfaces except the front surface, and a detachable front cover 31 that closes an opening on the front surface of the housing 30. An exhaust port 24 through which combustion exhaust gas is discharged from an exhaust unit provided in the upper part of the combustion chamber 2 is opened forward in the upper portion of 31. An exhaust adapter 32 that covers the exhaust port 24 from the front in a non-contact manner and changes the exhaust direction to the horizontal direction or the downward direction can be attached as an option to the front cover 31. In the lower part of the front cover 31, air supply ports 33 are formed.

The water heater 1 configured as described above opens the hot water tap 20 and allows water to pass through the appliance. When this is detected by the water amount sensor 17, the controller 12 rotates the air supply fan 3 to perform pre-purge, The original solenoid valve 9, the switching solenoid valve 11, and the gas proportional valve 10 are opened to supply gas to the burner 4, and the igniter 13 is operated to perform ignition control of the burner 4. The ignition of the burner 4 is confirmed by the frame rod 15.
Next, the controller 12 continuously changes the gas amount by controlling the opening of the gas proportional valve 10 according to the difference between the tapping temperature detected by the thermistor 21 and the set temperature set by the remote controller 23. The hot water temperature control is performed so that the hot water temperature matches the set temperature.
When water flow is no longer detected by closing the hot-water tap 20, the controller 12 closes the original solenoid valve 9, the switching solenoid valve 11, and the gas proportional valve 10 to extinguish the burner 4, and the air supply fan 3 Is rotated for a certain period of time to perform a post purge operation.

  On the other hand, the controller 12 continues after the power is turned on, considering that the load resistance of the air flow path from the supply fan 3 to the outlet of the exhaust adapter 32 changes when the front cover is provided with the exhaust adapter 32 ( A function of detecting the presence or absence of the exhaust adapter 32 and automatically setting the rotation speed of the air supply fan 3 in accordance with the type of the exhaust adapter 32 (either before the start of hot water supply, after the start of hot water supply, or after the end of hot water supply). I have. Hereinafter, this operation condition setting control will be described based on the flowchart of FIG.

First, in S1, it is determined whether or not the load resistance of the air circulation path obtained by converting the current value of the air supply fan 3 is equal to or less than the blockage determination value of the air circulation path. Therefore, the controller 12 also functions as a load resistance detection unit. If the load resistance is not less than or equal to the blockage determination value in this determination, it is determined that a blockage due to another cause has occurred in the air flow path, and this control is terminated.
On the other hand, if it is confirmed in S1 that the load resistance is less than or equal to the blockage determination value, it is determined in next S2 whether or not the load resistance is greater than or equal to a first reference value higher than the blockage determination value. If the load resistance is not greater than or equal to the first reference value, it is determined that the exhaust adapter 32 is not attached, and this control is terminated.

If the load resistance is greater than or equal to the first reference value in the determination of S2, it is determined that the exhaust adapter 32 is present.
If it is determined that the exhaust adapter 32 is present, it is determined in next S3 whether or not the load resistance is equal to or higher than a second reference value higher than the first reference value.
If the load resistance is greater than or equal to the second reference value, it is determined in S4 that the exhaust adapter 32 is of the A type (high resistance type with a small exhaust area), and the rotation speed of the supply fan 3 is set according to the high load resistance. Change the setting to a higher speed. On the other hand, if the load resistance is not equal to or greater than the second reference value, the exhaust adapter 32 is determined to be B type (low resistance type with a large exhaust area) in S5, and the rotation speed of the air supply fan 3 is set according to the low load resistance. Change the setting to low speed.

Thus, according to the hot water heater 1 of the said form, the controller 12 compares the detection value of load resistance with a 1st reference value, judges the presence or absence of the exhaust adapter 32 to the exhaust port 24, and the exhaust adapter 32's By setting the operating condition including the rotation speed of the air supply fan 3 according to the presence or absence, the operating condition according to the presence or absence of the exhaust adapter 32 can be automatically set, and the setting of the operating condition becomes convenient.
In particular, here, when the controller 12 determines that the exhaust adapter 32 is present, the controller 12 compares the detected value with a second reference value different from the first reference value to determine the type of the exhaust adapter 32, and determines the determined type of the exhaust adapter 32. Since the operating conditions are set accordingly, more appropriate operating conditions according to the type of the exhaust adapter 32 can be set.

  In the above operating condition setting control, the presence of the exhaust adapter 32 in S2 may be determined when the load resistance that is equal to or higher than the first reference value continues for a predetermined time (for example, several seconds). Similarly, in determining the type of the exhaust adapter 32 after S3, if the load resistance that is equal to or greater than the second reference value continues for a predetermined time (for example, several seconds), the exhaust adapter 32 is determined to be the A type and must continue for a predetermined time. For example, the exhaust adapter 32 may be determined as the B type. Thus, if the continuation of the predetermined time is set as the condition for determination, the presence / absence and type of the exhaust adapter 32 can be determined more accurately.

On the other hand, in the above embodiment, the controller that is the operation control means detects the current value of the air supply fan and also serves as the load resistance detection means, but a pressure sensor that detects the pressure of the combustion exhaust in the air flow path is provided. It may be provided separately as load resistance detection means.
Further, it is possible to set only the presence or absence of the exhaust adapter without determining the type of the exhaust adapter, and to set the operation condition, and it is possible to set the combustion capacity of the burner, the amount of water passing through the appliance, etc. as the operation condition. .

  In addition, the form of the water heater itself is not limited to the above contents, and the number of stages of the burner may be increased or decreased, and a single burner other than a plurality of stages may be used. In addition, there are types that do not have a bypass pipe, types that have a heat exchanger for baths and that have a bath side circuit that can be used to fill and reheat the bathtub, and types that have a heat exchanger for collecting latent heat. However, the present invention can be applied.

  1 .... Hot water heater, 2 .... Combustion chamber, 3 .... Air supply fan, 4 .... Burner, 5 .... Heat exchanger, 6 .... Water supply pipe, 7 .... Hot water pipe, 10 .... Gas proportional valve, 12..Controller, 18..Water quantity servo, 20..Hot water tap 21,22..Thermistor, 23..Remote control, 24..Vent, 30..Housing, 31..Front cover, 32 .. Exhaust adapter.

Claims (4)

With a burner,
A heat exchanger in which a water supply pipe and a hot water discharge pipe are connected and heated by the burner;
An air supply fan for supplying combustion air to the burner;
An exhaust port for discharging the combustion exhaust of the burner heat-exchanged by the heat exchanger to the outside;
Load resistance detection means for detecting load resistance of the air flow path by the air supply fan;
Operation control means for controlling combustion of the burner and rotation of the air supply fan,
The operation control means compares the detection value of the load resistance detection means with a first reference value to determine the presence or absence of an exhaust adapter at the exhaust port, and at least the air supply fan according to the presence or absence of the exhaust adapter A water heater characterized by setting operating conditions including the number of rotations.   When it is determined that the exhaust adapter is present, the operation control means compares the detected value with a second reference value different from the first reference value to determine the type of the exhaust adapter, and determines the determined type of the exhaust adapter. The water heater according to claim 1, wherein the operating condition is set accordingly.   The water heater according to claim 1 or 2, wherein the operation control means determines that the exhaust adapter is present when the detected value is equal to or greater than the first reference value for a predetermined time.   The hot water heater according to claim 2, wherein the operation control means determines the type of the exhaust adapter when the detected value is equal to or greater than the second reference value for a predetermined time.

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