JPH04190039A - Operation control method for parallel mounted hot water feeder - Google Patents

Abstract

PURPOSE:To make a substantial uniform frequency in use of a plurality of hot water feeders and their operating times by a method wherein after two or more hot water feeders are operated, a flow rate of one hot water feeder is detected, and a waiting hot water feeder is changed over in sequence. CONSTITUTION:In the event that No.1 hot water feeder is applied as a waiting hot water feeder, its solenoid valve 1a is turned on. When a hot water feeder plug 6 is opened and its flow rate is higher than xl, a solenoid valve 2a is also turned on and further a solenoid valve 3a is also turned on when the flow rate is higher than x+x'l and then three hot water feeders are operated in parallel. As it is detected that a flow sensor 7 detects that the flow rate is not one for performing operations of three hot water feeders, the solenoid valve 3a is turned off and in the event that two hot water feeders are not required, the solenoid valve 1a is turned off and No.2 hot water feeder is singularly operated to feed hot water. During a single hot water feeder operation, its total flow rate is counted and if it is detected that the flow rate becomes 0 after the flow rate is higher than the set flow rate and this state elapses for a certain set time, the solenoid valve 2a is turned on and the solenoid valve 1a is turned off. In this way, No.2 hot water feeder becomes its waiting state and then the hot water plug is opened, resulting in that No.2 hot water feeder is operated. Similarly, No.3 hot water feeder becomes its waiting state.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention involves installing a plurality of instantaneous water heaters in parallel, supplying water sent from a water source to each water heater in a branched manner, and generating heat in each water heater. It is configured to be able to supply the total amount of hot water that has been replaced, and the flow rate is detected by a flow sensor installed on the water source side, and in the case of a small flow rate, one water heater is operated to increase the flow rate. The present invention relates to a method for controlling the operation of a water heater, which enables stable hot water supply from low capacity to high capacity by simultaneously operating other water heaters accordingly.

[Conventional technology]

An example of the water heaters installed in parallel will be explained with reference to FIG.

In Fig. 5, reference numerals 1, 2, and 3 are instantaneous water heaters placed in parallel, and the heat exchangers of each water heater are connected in parallel to the water supply pipe 4, and the respective hot water outlet pipes are connected in parallel. It is connected to a common hot water supply pipe 5. Note that 6 is a hot water tap.

This type of water heater has a flow sensor 7 disposed on the water source side, and the operation of each water heater is controlled by a microcomputer control section 8 based on the detected value. That is, conventionally, when the flow rate is small, the solenoid valve 1a of the water heater 1 is opened and only one water heater 1 is operated to supply hot water, and when the flow rate is higher than the capacity of one water heater, the solenoid valve 1a, 2a is opened to operate the two water heaters 1 and 2, and when the flow rate is higher, the solenoid valves 1a and 2a are opened.
, 3a is opened and the three water heaters 1, 2.3 are operated simultaneously to provide the same function as a large water heater.

[Problem to be solved by the invention]

By the way, in the conventional operation of water heaters installed in parallel, if the flow rate is within the capacity of one unit, No. 1 water heater 1 is operated, and if the flow rate is higher than that, No. 1 and No. 2 water heaters 1 and 2 are operated. However, when the flow rate is higher than that, the order of operation is specified such that water heaters 1, 2.3 from No. 1 to No. 3 are operated.

For this reason, in conventional water heaters of this type, there is a problem in that the frequency of use and operating time of each water heater differs, and the lifespan of the water heater is determined by placing the greatest burden on the appliance that is operated at the lowest flow rate.

The present invention improves the problems of the prior art as described above, and operates a water heater installed in parallel that can equalize the frequency of use and operation time of multiple water heaters and extend the life of the entire appliance. The purpose is to provide a control method.

[Means to solve the problem]

In order to achieve the above object, the present invention provides that the flow rate is such that two or more units are operated and then one unit is operated without specifying the standby water heater that is initially operated at a small flow rate. The system is characterized in that when it detects this, it switches the standby water heater to sequential feeding.

In addition, the present invention counts the total flow rate when one water heater is in operation, and when it detects that the flow rate has become zero after the total flow rate has reached the set flow rate or more, the standby water heater is switched to another water heater. It is characterized by switching.

[Effect]

As described above, the present invention switches the standby water heaters sequentially when it detects that the flow rate is the same as for one unit after operating two or more units.For example, in the case of three units installed in parallel, the first If the standby water heater is the No. 1 water heater, the No. 1 water heater will be operated when the flow rate is small, and when the capacity is greater than the operation capacity of one unit, No. 1 and No. 2, or No. and N.
o2. The No. 3 water heater is operated, and then when it detects that the flow rate is for one unit operation, the No. 2 water heater becomes the standby water heater, and the next time hot water is supplied, the No. 2 water heater is also operated, and then multiple units are operated. When it is detected that the flow rate has reached 1 unit operation, the No. 3 water heater becomes the standby water heater, and the water heaters that are operated first at a small flow rate are switched in sequence, and the usage frequency of each water heater is averaged. be converted into

In addition, the present invention counts the total flow rate when one unit is in operation, and when the total flow rate reaches the set flow rate or more and detects that the flow rate is zero, that is, the operation has stopped, the standby water heater is switched to another water heater. Since the water heaters are switched, the frequency of use of each water heater can be averaged even if one water heater continues to operate at a low flow rate.

〔Example〕

An example of the implementation of the present invention will be described below with reference to FIGS. 2 to 4.

FIG. 1 shows a flowchart of the operation when two water heaters are installed in parallel.

As shown in this figure, when the power is turned on, the solenoid valve of the standby water heater (in this case, the solenoid valve 1a of the Nol water heater) opens and goes on standby. When the hot water tap 6 is opened in this state,
The flow sensor 7 detects that there is running water, and the electronic control unit 8 starts operating the Nol water heater, and then the flow rate reaches 1.
It is determined whether or not the unit operating capacity xQ (for example, 9 fl/min) is higher than that, and when the flow rate is 10 or higher, the solenoid valve 2a of the No. 2 water heater is opened to supply hot water using the total capacity of the No. 1 and No. 2 water heaters. After that, the flow sensor continues to detect the flow rate, and the flow rate x-
When it is detected that it is less than x' (for example, 7Q per minute),
The solenoid valve 1a of the No. 1 water heater is turned off and hot water is supplied by the No. 2 water heater.

When the No. 1 or No. 2 water heater is operated alone, the total flow rate is counted, and it is determined whether the total flow rate has exceeded the set flow rate, for example, 100Q, and after the total flow rate has exceeded the set total flow rate, the flow rate is zero, that is, the operation is stopped. When the operation is stopped and the operation is detected to have continued for more than 5 seconds, the No. 2 solenoid valve is turned on and the N
Turn off the ol solenoid valve and reset the total flow counter. That is, in this case, the No. 1 standby water heater is switched to the No. 2 water heater.

In the above operation, the reason why the standby water heater is switched after detecting that the flow rate has reached zero is because if it is switched during hot water supply, the temperature may rise rapidly depending on the flow rate at that time, or it may stop temporarily. This is because there are timing issues.

FIGS. 2 to 4 are flowcharts of operating operations to which the present invention is applied when three water heaters are installed.

Similarly to FIG. 1, when the Nol water heater is used for initial standby use, the solenoid valve 1a of the Nol water heater is turned on when the power is turned on.

When the hot water tap 6 is opened in this state, the No. 1 water heater is operated in the same manner as shown in Fig. 1, and when the flow rate is over XQ (for example, 9 Q/min), the solenoid valve of the No. 2 water heater is also turned on, and two units are connected in parallel. Further, when the speed exceeds x+x'cL (for example, 11Q per minute), the solenoid valve of the No. 3 water heater is also turned on, and three units are operated in parallel. When the flow sensor 7 detects that the flow rate is such that there is no need to operate three units, the solenoid valve of the No. 3 water heater is turned off, and further, when it detects that the flow rate is such that there is no need to operate two units, the No. 3 water heater is turned off.
1Turn off the solenoid valve of the water heater and let the No. 2 water heater operate independently to supply hot water. In addition, when a No. 1 or No. 2 water heater is operated independently, the total flow rate is counted, and it is determined whether the total flow rate exceeds the set flow rate, for example, 100Q. No. 2 when detecting that a certain set time has elapsed
Turn on the solenoid valve of the water heater, turn off the solenoid valve of the No. 1 water heater, and reset the total flow counter.

In this way, the No. 2 water heater enters the standby state, and when the hot water tap is opened next, as shown in Fig. 3, the second water heater is operated first, and when the flow rate is such that it is necessary to operate two water heaters, the No. 2 water heater and the No. 3 water heater are operated. When the flow rate is such that it is necessary to operate three units, the No. 3 water heater is further operated.
The water heater is on standby. Further, at this time, the No. 3 water heater also enters the standby state when it is detected that the total flow rate exceeds the set flow rate and then becomes zero after the flow rate of one water heater is operated.

In this way, when the hot water tap is opened after the No. 3 water heater goes into standby mode, as shown in Figure 4, the No. 3 water heater is operated first, and when the flow rate reaches the level that requires two units to be operated, the No. 3 water heater and the No. 1 water heater are operated. are operated, and when the flow rate reaches a level that requires operation of three units, the No. 2 water heater is further operated, and then, when the flow rate reaches the level required for operation of one unit, No. 1 enters the standby state, and the next operation is performed as shown in Figure 2. . The same applies when it is detected that the flow rate becomes zero after the total flow rate exceeds the set flow rate when one unit is operated.

〔Effect of the invention〕

As described above, according to the present invention, in a water heater in which a plurality of water heaters are installed in parallel, the usage frequency and operating time of each water heater can be equalized to extend the life of the entire appliance. There is an effect that can be achieved.

[Brief explanation of drawings]

Fig. 1 is a flowchart showing an embodiment of the present invention when two water heaters are installed in parallel, and Figs.
This is a flowchart showing an embodiment of the present invention when multiple water heaters are installed in parallel. Figure 2 is for the first hot water supply, Figure 3 is for the second hot water supply, and Figure 4 is for the third hot water supply. It is something. FIG. 5 is an explanatory diagram showing the configuration of water heaters installed in parallel. 1.No.1 water heater, 1a..No.1 water heater solenoid valve, 2.No.2 water heater, 2a..No.2 water heater solenoid valve, 3..No.3 water heater, 3a..No.3 water heater Solenoid valve, 4. Water supply pipe, 5. Hot water supply pipe, 6. Hot water tap, 7
...Flow sensor, 8...Electronic control section. Patent Applicant: Gaster Co., Ltd. Patent Attorney Tadashi Akimoto Figure 1

Claims (1)

[Claims] 1. A plurality of instantaneous water heaters can be installed in parallel, water sent from a water source can be branched and supplied to each water heater, and the total amount of hot water exchanged with each water heater can be supplied. The flow rate is detected by a flow sensor installed on the water source side,
A method for controlling the operation of water heaters installed in parallel in which the number of water heaters used is switched according to the detected flow rate, and the method is to control the operation of two or more water heaters without specifying the standby water heater that is operated first at a small flow rate. A method for controlling the operation of water heaters installed in parallel, characterized in that, after performing the above operations, if the flow rate is detected to be the flow rate for one unit operation, the standby water heaters are switched to sequential feeding. 2. A plurality of instantaneous water heaters are installed in parallel, and water sent from a water source is branched and supplied to each water heater, so that the total amount of hot water heat exchanged by each water heater can be supplied. In addition, the flow rate is detected by a flow sensor installed on the water source side,
A method for controlling the operation of water heaters installed in parallel in which the number of water heaters used is switched according to the detected flow rate, and the number of water heaters to be used is switched in accordance with the detected flow rate. After performing the above operation, if it detects that the flow rate is for one unit operation, the standby water heaters are switched to sequential feeding, and when the flow rate is one unit operation, the total flow rate is counted, and the total flow rate reaches the set flow rate or more. A method for controlling the operation of water heaters installed in parallel, characterized in that when it is detected that the flow rate has become zero after the water heater has been used, the standby water heater is switched.