JPS5918216Y2 - gas pressure proportional control valve - Google Patents

Description

[Detailed description of the invention] Industrial application field The present invention relates to a gas instantaneous water heater of the type that is used by heating a heat exchanger with a gas burner to produce hot water, which is then immediately discharged from a hot water faucet via a water channel. It is something.

Conventional configuration and its problems In this type of conventional gas instantaneous water heater, the combustion amount of the gas burner was always constant, so a heat exchanger was used to vary the temperature of the hot water flowing out from the hot water faucet. The amount of water flowing into the tank had to be varied.

In other words, for example, when hot water is needed to remove oil stains, the hot water faucet is closed to reduce the amount of water flowing into the heat exchanger; conversely, when lukewarm water is sufficient, the hot water faucet is opened wide to reduce the amount of water flowing into the heat exchanger. This resulted in an increase in water inflow.

However, with such a configuration, it was not possible to obtain the desired amount of hot water at the desired temperature, making it extremely difficult to use.

Technical Problem of the Invention The technical problem of the invention is to make it possible to obtain hot water at a desired temperature at a desired flow rate by varying the gas flow rate to the gas burner.

The technical means of the invention and the technical means of the invention taken to achieve the above object are as follows.

That is, a gas proportional control valve is interposed in the gas supply path to the gas burner, and a control circuit is provided to control the amount of gas controlled by the proportional control valve.

This control circuit is configured to detect the temperature of hot water near the outlet of the heat exchanger using a detector and transmit the detected temperature.

Further, the gas proportional control valve has a valve hole between the gas inlet and the gas outlet, a diaphragm on the gas inlet side of the valve hole, and a valve body on the gas outlet side. The diaphragm is connected to the diaphragm through the diaphragm, and an electromagnetic driver is connected to the diaphragm to control the amount of drive of the diaphragm based on the amount of current supplied from the control circuit.

Action of technical means The above technical means works as follows.

Assuming that the hot water tap is now open and hot water heated by the gas burner in the heat exchanger is flowing out of the hot water tap, the temperature of the hot water near the outlet of the heat exchanger is detected by a detector, The value is transmitted to the control circuit, where it is compared with the hot water temperature set value, and based on the comparison result, the current value to the electromagnetic driver of the gas proportional control valve is determined.

Then, in the gas proportional control valve, the diaphragm is driven according to the current value flowing through the electromagnetic driver, the valve body is driven via this diaphragm, and the degree of opening of the valve hole is determined.

Further, in this state, the opening degree of the valve hole is stabilized due to the governor characteristics of the valve body, valve hole, and diaphragm.

In this case, if the detected value is lower than the hot water temperature setting value of the control circuit, the valve body is driven in a direction that increases the opening degree of the valve hole, increasing the amount of gas supplied to the gas burner and increasing the combustion amount. , the water temperature is increased, and conversely, if the detected value is high, the opening degree of the valve hole is reduced to lower the water temperature.

For this reason, even if the amount of water flowing into the heat exchanger is increased by opening the hot water tap wide, for example, if the temperature of the water near the outlet of the heat exchanger decreases due to the increase in the amount of water, the degree of opening of the valve hole will immediately change. This increases the combustion amount of the gas burner, and as a result, the temperature of the hot water coming out of the hot water faucet immediately rises to the original set value.

Conversely, if you tighten the hot water faucet to reduce the amount of water flowing into the heat exchanger and raise the water temperature, the opening of the valve hole will be reduced and the temperature of the hot water coming out of the hot water faucet will immediately drop to the original set value. do.

In other words, even if the amount of hot water supplied is increased or decreased as needed, the temperature of the water flowing out of the hot water faucet will hardly change, making it extremely convenient to use.

Unique effects of invention The unique effects of the present invention include the following.

First, in this invention, the water temperature near the heat exchanger outlet is detected by a detector to control the opening of the valve hole of the gas proportional control valve.
The response is faster than the one that controls the opening of the valve hole by detecting the temperature of the hot water in the hot water faucet or the temperature of the hot water flowing out from it, and this is extremely useful when taking a shower. 'It becomes comfortable.

In other words, the distance from the heat exchanger to the hot water faucet is quite long, and it varies from household to household, so as mentioned above, the opening of the valve hole is controlled by detecting the hot water faucet and the temperature of the hot water flowing from it. If this is the case, there will already be a lot of hot water whose temperature has fluctuated between the water channel from the heat exchanger to the hot water faucet, and this will flow out from the hot water faucet as is.

For example, it is said that even a 0.5 degree change in water temperature can be noticed during a shower, which can be extremely uncomfortable, and if the water temperature fluctuates too high, there is a risk of burns.

On the other hand, in the present invention, since the hot water temperature near the outlet of the heat exchanger is detected, the temperature change accompanying the change in the amount of hot water is immediately corrected by the valve hole opening degree control, and the temperature near the outlet of the heat exchanger is corrected immediately. As mentioned above, the small amount of hot water temperature fluctuation that has reached 0° is reduced by mixing with a large amount of hot water whose temperature has been corrected later in the long waterway leading to the hot water faucet (in one embodiment, the hot water temperature fluctuation is 0°). There was not even a single degree change in the water temperature.

), and in this state it flows out of the hot water faucet, making it extremely comfortable to take a shower.

Second, in the present invention, a diaphragm is provided on the gas inlet side of the valve hole, and a valve body is provided on the gas outlet side, and the primary gas pressure is applied to the diaphragm and the valve body to obtain governor characteristics. Compared to a system that obtains governor characteristics by applying secondary gas pressure to a diaphragm in addition to the valve body, it is more compact and has better responsiveness when controlling the valve hole.

In other words, obtaining governor characteristics means ensuring that the secondary gas pressure does not fluctuate even if the primary gas pressure fluctuates, and with this invention, the effective pressure receiving area of the valve body and the effective pressure receiving area of the diaphragm are In other words, the diaphragm can be made as small as the valve body, and the smaller the diaphragm, the more compact the gas proportional control valve will be. , moreover, when this diaphragm is driven by an electromagnetic driver, it becomes extremely responsive.
As a result, fluctuations in hot water temperature become smaller, and this means that the above-mentioned shower that directly sprays hot water on the human body can detect fluctuations in water temperature even by 0.5 degrees at a time, making it more comfortable and highly stable. be.

Furthermore, the current flowing through the electromagnetic drive body can be reduced to save energy, and since the electromagnetic drive body is a small current drive body, it can be made smaller.If the diaphragm is also small as mentioned above, it can be made extremely compact as a whole. be.

On the other hand, in devices that obtain governor characteristics by applying secondary gas pressure to the diaphragm, in order to prevent fluctuations in the primary gas pressure from causing fluctuations in the secondary gas pressure, the effective pressure receiving area of the diaphragm must be It is extremely large in comparison (
According to one calculation, about 50 times more),
As the gas proportional control valve becomes larger, its responsiveness naturally deteriorates, the degree of change in hot water temperature also increases, and the current flowing through the electromagnetic drive body also increases, further increasing the overall size. It is.

DESCRIPTION OF THE EMBODIMENTS Reference numeral 22 in FIG. 2 is a gas instantaneous water heater, and water flows from a water supply port 23 to a hot water faucet 25 after being heated by a heat exchanger 24 .

On the other hand, gas is introduced from the gas port 26, passes through the main valve 27, and is sent to the gas burner 29 via the gas proportional control valve 28.

30 is a detector that detects the water temperature at the outlet of the heat exchanger 24;
From here, a detection signal proportional to the water temperature is sent to the control circuit 31.

The control circuit 31 compares the set value of the hot water temperature on the temperature scale 32 with the detection signal, converts the result into a current signal, sends it to the gas proportional control valve 28, and adjusts the amount of gas supplied to the gas burner 29.

Next, FIG. 1 shows the gas proportional control valve 28, and 1
2 is a gas inlet, 2 is a gas outlet, and 3 is a valve hole formed between the gas port 1 and the gas outlet 2.

(There is a valve hole in the valve hole portion 3.) 4 is a valve body disposed on the gas outlet 2 side facing the valve hole portion 3, and having one end passed through the valve hole and connected to the diaphragm 5. .

In addition, the chamber 11 formed on the diaphragm 5 side has a gas population of 1
The chamber 12 on the gas outlet 2 side is connected to the gas outlet 2, and has a structure in which a gap 13 controlled by the valve body 4 and the valve hole 3 is provided in between.

Further, the chamber 15 formed on the outside of the diaphragm 5 has a small hole 16.
The chamber 15 and the chamber 11 are separated by a diaphragm 5.

In other words, this section A in FIG. 1 constitutes a gas governor section.

Next, part B in FIG. 1 shows the electromagnetic drive part, and 17 is the magnetic circuit 1.
It is a cylindrical electromagnetic coil enclosed in 8 and has a plunger 19 inside.

The plunger 19 is made of a magnetic material, and one end thereof is connected to the diaphragm 5 and the valve body 4 via a plunger end 20 made of a non-magnetic material, and the other end is an elastic plate 21 (hereinafter referred to as It is attached to the magnetic circuit 18 via a leaf spring (referred to as a leaf spring).

Further, the plunger 19 is held by the diaphragm 5 and the leaf spring 21 so as not to come into contact with the inner wall of the coil 17.

With the above structure, the electromagnetic coil 17 generates a force that attracts the plunger 19 downward, causing the diaphragm 5 and the valve body 4 to move downward.

Here, since the attraction force of the electromagnetic coil 17 can be freely varied according to the value of the current flowing into the electromagnetic coil from the control circuit 31 shown in FIG. 2, the combustion amount of the gas burner 29 can be automatically varied accordingly.

Further, when the current of the electromagnetic coil 17 is not applied, the valve body 4 is raised by the biasing force of the diaphragm 5 or the leaf spring 21, and the valve hole of the valve hole portion 3 is closed.

On the other hand, even if the gas pressure on the gas port 1 side changes when the electromagnetic coil 17 current is flowing to some extent and is stable, the governor section (valve 4, valve seat 3, diaphragm 5, coil 17, plunger 19, leaf spring 21 etc.), the gas secondary pressure at the gas outlet 2 does not change.

In short, the heat exchanger 2 is heated by the gas burner 29.
The hot water heated in step 4 flows out from the hot water faucet 25, but if the hot water faucet 25 is opened wide to increase the flow rate, the hot water temperature at the detection unit 30 will drop below the set value. This detected value is immediately compared with a set value in the control circuit 31, and based on the comparison result, the amount of current flowing through the electromagnetic coil 17 of the electromagnetic drive section B of the gas proportional control valve 28 is increased.
The opening degree of the valve hole of the valve hole portion 3 is increased to increase the amount of gas supplied to the gas burner 29, increasing the amount of combustion, and quickly returning the hot water temperature to the original set value. Conversely, if the water temperature in the detection section 30 rises, the amount of current to the electromagnetic coil 17 of the electromagnetic drive section B is reduced to reduce the degree of opening of the valve hole in the valve hole section 3, and the water temperature is immediately returned to its original value. The setting value is set to .

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a gas proportional control valve of a gas instantaneous water heater according to an embodiment of the present invention, and FIG. 2 is a configuration diagram of the same gas instantaneous water heater.

Claims (1)

[Scope of utility model registration request] A heat exchanger interposed in the waterway between the water supply inlet and the hot water faucet, a gas burner that heats this heat exchanger, a gas proportional control valve interposed in the gas supply path to this gas burner, and this gas proportional control. The control circuit includes a control circuit that controls the amount of gas controlled by the valve, and a detector that detects and transmits the temperature of hot water near the outlet of the heat exchanger, and the gas proportional control valve is connected to the gas inlet. a valve hole interposed between the valve hole and the gas outlet; a diaphragm provided on the gas inlet side of the valve hole; and a diaphragm provided on the gas outlet side of the valve hole and connected to the diaphragm through the valve hole. the valve body,
A gas instantaneous water heater comprising: an electromagnetic driver connected to the diaphragm and controlling the amount of drive of the diaphragm according to the amount of electricity supplied from the control circuit.