JPS6219643A - Gas instantaneous water heater - Google Patents

Abstract

PURPOSE:To obtain a stable gas interrupting characteristic at the time of oxygen deficiency and to make it possible to freely change the hot water supply function by dividing a gas passage into two parts, providing a main gas burner in one of the passages and also providing a gas flow amount adjuster capable of adjusting the gas flow quantity in another. CONSTITUTION:After passing through a hydraulic responding valve 12c, the gas flows into gas passages 1a and 1b. The gas introduced into the gas passage 1a is made into a constant flow amount by means of a main gas burner 14. Then, a gaseous mixture emitted from one port of a main gas governor 14 is ignited by means of an ignition spark to form a flame. On the other hand, the gas which has passed through the gas passage 1b burns by the shift of flame burning at one port of main gas burners 5. In this case, since a sub gas governor 15 has a structure in which the pressure governing thereof can be easily made by the user, it is possible to easily change the gas flow amount. Further, since a thermoelectric couple unit 7 is inserted into the upper part of the main burner 5 in which the gas passing through the gas passage 1a is burnt, a current flowing through an electromagnetic valve 12a can be reduced prior to the incomplete combustion in the case of oxygen deficiency to close the valve, and the gas passage is interrupted thereby to stop the combustion.

Description

[Detailed description of the invention] Industrial applications The present invention relates to a gas instantaneous water heater.

BACKGROUND OF THE INVENTION In recent years, it has become common for open type gas instantaneous water heaters to be equipped with devices to prevent incomplete combustion, and there is a movement toward legislation in the next few years. Incomplete combustion has been detected indirectly by detecting changes in the state of the pilot burner flame, but recently there has been a trend toward direct detection using the main burner.

Hereinafter, an example of the conventional gas instantaneous water heater mentioned above will be described with reference to the drawings.

Figure 2 shows the configuration of a conventional gas instantaneous water heater.
In this Figure 2, 1 is a gas passage, 2a and 2b are electromagnetic valves, 3 is a gas flow regulator (gas governor), 4 is a nozzle,
5 is a main burner, 6 is a control circuit unit, 7 is a thermocouple unit, 8 is a water passage, 9 is a running water switch, 10 is a heat exchanger, and 11 is a faucet.

The operation of the gas instantaneous water heater configured as described above will be described below.

First, when the faucet 11 is opened, water flows into the water passage 8, the water flow switch 9 is turned ON, and the control circuit unit 6 opens the solenoid valve 2a.As a result, gas flows through the gas passage 1, and the gas governor 3, the flow rate is restricted, and the gas is further ejected through the gas passage 1a through the nozzle/v4 and mixed with air.
After that, it enters the main burner 5 and the ignition device (not shown)
ignites and forms a flame. The gas flow rate can be changed by opening or closing the solenoid valve 2b via the control circuit unit 6 using a capacity changeover switch (not shown). Water is heated in a heat exchanger 1o by the flame of a main burner 5, and hot water is discharged from a faucet 11. In addition, when combustion is carried out in a room with poor ventilation, the flame of the main burner 5 gradually extends, the electromotive force generated by the thermocouple unit 7 inserted into the flame decreases, and the electromotive force generated by the thermocouple unit 7 inserted into the flame decreases. )6 detects and solenoid valve 2a, ? [Magnetic valve 2b
Since it works to close the pores, incomplete combustion due to lack of oxygen can be prevented.

Problems to be Solved by the Invention However, in the above configuration, the gas pressure in the gas passage 1a is different when the solenoid valve 2b is closed and when it is open. The size of the flame formed also changes. For this reason, if oxygen deficiency is detected based on flame temperature, if the flame size changes, the relationship between temperature and oxygen concentration will shift, making it impossible to maintain stable oxygen deficiency performance.In addition, it will be difficult to switch the gas flow rate. Since it has only two stages, it has the problem of being inconvenient to use.

In view of the above-mentioned conventional problems, the present invention provides an object to reliably shut off combustion at an oxygen concentration before incomplete combustion occurs, and also to steplessly adjust the gas flow rate when there is a lack of oxygen due to poor ventilation. The purpose is to provide an easy-to-use gas instantaneous water heater.

Means for Solving the Problems In order to solve the above problems, the gas instantaneous water heater of the present invention is provided with gas passages divided into two systems, and a main gas governor is provided in one of these gas passages.

Moreover, a gas flow rate adjustment device is provided on the other side.

Effect According to the above configuration, since the main gas governor is provided on one side of the gas passage, stable flame combustion can be obtained, and as a result, operation in the case of oxygen deficiency can be stabilized, and the main gas governor can be Since the passage is provided with a gas flow rate adjusting device capable of adjusting the gas flow rate, the gas flow rate can be changed steplessly or the amount of change can be greatly changed.

Embodiment Two embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 shows the configuration of a gas instantaneous water heater in one embodiment of the present invention. In FIG. 1, the same parts as in FIG. 2 shown in the conventional example are given the same numbers, and their explanations are omitted, and only the points that are different from the conventional example will be explained. 12a is a solenoid valve that is kept open by the electromotive force generated by the thermocouple unit 7; 12b is a manual main gas valve; 12c
is a hydraulically responsive valve, and this hydraulically responsive valve 12c is in the N configuration to open when water flows. Further, this water pressure responsive valve 12c is linked to the water amount adjusting device 13.

14 is a main gas governor provided in one of the gas passages 1a and 1b divided into two systems; 15;
is a gas flow rate adjusting device (subgas governor) that can change the gas flow rate by changing the compression ratio of a spring, and this subgas governor 15 is connected to the other gas passage 1b.
It is set in. 16 is a water faucet.

The operation of the gas instantaneous water heater configured as described above will be described below. However, the conventional example shown in Fig. 2 is called a stop-start type water heater, and the ignition operation starts after water flows, but the water heater in the embodiment of the present invention is a stop-start water heater. The ignition starts before water flows.

These differences in system and configuration are not considered to be a major problem in the case of the present invention, so they will not be distinguished.

When the ignition operation is performed, the electromagnetic valve 12 a and the main gas valve 12 b open to start the ignition spark, and then the water faucet 16 opens and the water volume adjustment device 13 senses water, and the water pressure responsive valve 1 is activated.
2c to completely open the gas passage 1. After the gas passes through the hydraulically responsive valve 12c, it is divided into gas passages 1a and 1b, and the gas that has entered the gas passage 1a is made into a constant flow rate by the main gas governor 14.

Nozzle) The ignition spark blows out from V4, and the air-fuel mixture exits from main burner 5 and 1 wood! Fire and form a flame. On the other hand, the gas passing through the gas passage 1b is kept at a constant flow rate by the sub-gas governor 14, and the flame burning in one of the main burners 5 ignites and burns. In this case, since the sub-gas governor 14 has a groove structure that allows the user to easily change the pressure regulation, the gas flow rate can be easily changed by changing the pressure regulation.

In addition, since a thermocouple unit 7 is inserted in the upper part of the main burner 5 that burns through the gas passage 1a, in the event of oxygen deficiency, the thermocouple unit 7 detects the flame temperature and prevents incomplete combustion. Before this occurs, the current flowing through the electromagnetic valve 12a is reduced to close the valve, cutting off the gas passage and stopping combustion. In this case, combustion can be stopped at a predetermined oxygen concentration regardless of the total amount of gas, and this is because the flame of the main burner 5 always maintains a constant size.

As described above, according to this embodiment, the gas passage is divided into two gas passages 1a and 1b, a constant flow rate is passed through one of the gas passages 1a, and the flame caused by the gas is detected to accurately detect oxygen deficiency. Since the state of combustion can be known and the gas flow rate can be changed in the other gas passage 1b, the hot water tapping capacity can be changed steplessly, making it easy to use.

The sub-gas governor 15 is a variable gas flow rate adjusting device, but if the gas flow rate is relatively small, it may be a component that simply adjusts the gas flow rate by changing the passage resistance.

Effects of the Invention As described above, according to the present invention, the gas passage is divided into two,
Since the main gas governor is installed on one side and a gas flow rate adjustment device that can adjust the gas flow rate is installed on the other side, it has stable D gas cutoff characteristics in the event of oxygen deficiency, and the gas flow rate can also be changed steplessly. The port departure capacity can be changed freely.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a gas instantaneous water heater showing an embodiment of the present invention, and FIG. 2 is a block diagram of a conventional gas instantaneous water heater. 1a... One gas passage, 1b... Other gas d path, 14... Main gas governor, 1
5...Sub gas governor (gas flow rate adjustment device). Name of agent: Patent attorneys Nakao, Toshio, and 1 other fa
・-・ One force "Sumi step Ib..., the other force" through J each method 3... Main space 14..., saa no ska) te (force's solution ξ 1 lesson V Figure 1

Claims (1)

[Claims] A gas instantaneous water heater characterized in that it is equipped with two gas passages, a main gas governor is provided in one of these gas passages, and a gas flow rate adjustment device is provided in the other.