JPS5920942B2 - water supply water heater - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a water supply and hot water supply device that heats water and supplies hot water to a hot water tap, hot water tap, etc.

In the conventional water supply and hot water supply system, as shown in Fig. 1, a water tank 1 is installed at a high place, and water supplied from a primary water supply pipe 3 is controlled by a ball tap 2 installed in the water tank 1. 1
Water is supplied through a water supply pipe 4 to a boiler 5 located in a low place using the potential energy of , the water is heated by the boiler 5, and the hot water is supplied to a Java 6° hot water tap 7 through a hot water supply pipe 8.

Although it seems easy to install the water tank 1 at a high place in this way, it actually requires a suitable high place space.
The installation work is difficult, and the piping is long, resulting in increased costs in terms of construction costs, construction time, and required labor.

Further, FIG. 2 shows another conventional example.

Reference numeral 9 denotes a water supply device, and a water tank 1 is installed at a low place. Water supplied from a primary water supply pipe 3 is controlled by a ball tap 2, and water in the water tank 1 passes through a suction pipe 10 to a water supply pump 11.
The water is sucked into the water supply pump 11 and pressurized.

Here, a check valve 12 is installed in the midway circuit of the suction pipe 10 to prevent backflow.

The pressurized water is stored in a pressure tank 13. pressure switch 14,
It is supplied to the boiler 5 via the discharge pipe 15.

This pressure switch 14 opens and closes an electric motor (not shown) that drives the water supply pump 11 according to a set pressure, and serves to start and stop the water supply pump 11, and the water supplied to the boiler 5 is heated by the boiler 5. The hot water is supplied to the Java 6 and hot water tap 7 through a hot water pipe 8.

In addition, a safety valve 16 is installed in this hot water pipe 8, and the boiler 5. This prevents the pressure inside the hot water supply pipe 8 from becoming excessively high.

In the water heater shown in FIG. 2, when the jaw 6 and hot water tap 7 are suddenly closed, water hammer occurs between the jaw 6 and the hot water tap 7 and the check valve 12, and if this water hammer is applied repeatedly, the boiler 5 may be damaged by fatigue or the inner surface treatment may be damaged, or the water supply pump 11 or pressure tank 13 may be damaged.

In particular, since the boiler 5 is often made of thin steel plates, repeated stress can cause fatigue failure of welded parts and bent parts, which is dangerous.

The purpose of this invention is to solve these problems.

The features of this invention include: a water supply device consisting of a water storage tank and a water supply pump; a boiler that warms the water sent from the water supply device; a hot water pipe that sends hot water from the boiler to a Java, hot water tap, etc. ; A water supply and hot water supply device comprising a check valve installed in the hot water supply pipe, an air absorption device is provided between the check valve of the hot water supply pipe and the hot water tap, and the air absorption device is The present invention is comprised of a closed container projecting upward from the hot water supply pipe side via a connecting pipe, and an automatic air vent valve projecting from a midway point in the vertical direction of the closed container via a projecting pipe.

Hereinafter, this invention will be explained with reference to the drawings.

FIG. 3 shows an embodiment of the present invention, in which a water supply device 9
and boiler 5 are the same as water supply device 9 and boiler 5 in FIG. 2, but from boiler 5 to Java 6, 6'.

Two hot water pipes 8 and 8' are installed to supply hot water to the hot water taps 7 and 7', and one of the hot water pipes 8 is equipped with a check valve 17 such as a check valve or a pressure reducing check valve. The other hot water supply pipe 8' has a hot water supply pump 18 and the above-mentioned valve 1 on the discharge side thereof.
A check valve 17' similar to that of Java 6',
Send hot water to the hot water tap 7'.

Further, hot water is branched from an intermediate circuit between the hot water pump 18 and the check valve 17', and is supplied to a radiator 19 for heating or the like through a pipe 20.

Depending on the need, the radiator 19 and the piping 20 may not be provided, or only one of the hot water supply pipes 8 and 8' may be provided.

Here, if the Java 6 and hot water tap 7 are suddenly closed, water hammer will occur between the Java 6 and hot water tap 7 and the valve 1γ, but the hot water pipe 8 and its joints are strong and cannot be rotated. Does not cause any problems.

And boiler 5. Since the water hammer is not transmitted to the pressure tank 13 or the water supply pump 11 at all, it will not cause any damage or malfunction to these.

Next, even if the Java 6' and hot water tap 7' are suddenly closed, the valve 1γ similarly prevents the water flow from spreading to the boiler 5, pressure tank 13, water pump 11, hot water pump 18, and radiator 19. be.

In the latter case, the radiator 19 is made of a particularly thin steel pipe or the like to improve thermal efficiency, but its fatigue life is significantly extended.

Note that, if necessary, an air absorption device 22, which will be described in detail later with reference to FIGS. 10 to 12, may be attached to the upper part 21 of the boiler 5, the hot water supply pipes 8, 8', or the piping 20.

FIG. 4 shows another embodiment of the present invention, in which a water supply device 9
The configuration differs from that in Fig. 2, with a check valve 12 and a pressure tank 1.
3. The water supply pump 23 is a simple one without any pressure switch 14, but the water supply pump 23 is set to the operating pressure P of the boiler 5.

(kνd) (normally P is 1 kg/ff1), and the discharge amount Q (m7s) is made to be zero at a pressure p/3 lower than that (normally P is 1 kg/ff1).

In other words, the cut-off pressure is p/3.

This is illustrated in FIG. 5.

Although this figure takes a centrifugal pump as an example, the present invention is not limited to centrifugal pumps.

In the figure, the horizontal axis is the discharge amount Q (m”/s), and the vertical axis is the discharge pressure P.
(Y/, ff1), which is expressed by taking the required horsepower W (Ps).

In the figure, a curve I shows the relationship between the discharge amount Q and the required horsepower W, and a curve n shows the relationship between the discharge amount Q and the discharge pressure P.

As shown in the figure, in a centrifugal pump, the required horsepower W increases with the flow rate Q, and if the flow rate Q decreases, the required horsepower W also decreases.
will be small, and electricity costs will be reduced.

Moreover, even if the water supply pump 17 is constantly rotating, the pressure P of the boiler 5 in FIG. 4 is the operating set pressure P.

(P≦P3×P.), so it is safe even though there is no pressure switch 14, pressure tank 13, etc. as shown in FIG.

In addition, conventionally, in the water supply and hot water supply apparatus shown in FIG. As the water temperature changes, it is very uncomfortable and the pressure switch 1 changes during use.
If Java 4 malfunctions, the water temperature will rise dramatically and Java 6
, there was a risk of burns due to hot water coming out from the hot water tap 7, but this problem has been solved with the hot water supply device shown in Fig. 4.

In addition, since the feed water pump 23 is constantly rotating, there is little variation in pressure, and there is no shock pressure when starting or stopping, so in the case of Fig. 2, the life of the boiler 5 will be extended. It was significantly extended.

Furthermore, since there is no check valve 12 like the check valve 12 shown in FIG. 2, the volumetric expansion when water turns into hot water can escape to the water tank 1, so the safety valve 16 and the like are not needed, and the safety valve 1
The trouble caused by the failure of 6 has also disappeared.

In addition, starting the water supply pump 11 of the water supply and hot water supply apparatus shown in FIG. 2,
If it stops repeatedly, it will frequently apply shocks to the water supply pump 11 and the electric motor (not shown), and if this device is used at home, the voltage will fluctuate each time, causing the lights to flicker. However, the water supply device 3 shown in FIG. 4 can solve all of these problems.

Next, the boiler 5, hot water supply pipes 8, 8', piping 20,
The configurations of the valves 17, 17', hot water pump 18, radiator 19, etc. are the same as in the embodiment shown in FIG.

Valves 17 and 17' are Java 6.6', water tank 5 and water supply pump 2 due to sudden closing of hot water taps 7 and 7'.
The third point is to prevent the spread of
It was similar to the figure.

However, the air absorption device 22 may include the hot water pipe 8,
8', but not to the boiler 5 or piping 20.

The reason is that when the water supply pump 23 is stopped, air is sucked in from the air absorption device 22 and flows back into the water tank 1 in large quantities.

Next, FIG. 6 shows another embodiment of this invention.

The configuration of the water supply device 9 is different from that shown in FIG. 2, and is simple in that the check valve 12, pressure tank 13, and pressure switch 14 are all eliminated, but the water supply pump 23 is provided below the water tank 1. There is.

Then, the seventh
One or more small holes 25 as shown in the figure are drilled, and circulation thin tubes 26 are connected to the small holes 25 to connect the water storage tank 1 and the casing high pressure section 2.
4 are connected.

And the working pressure P of the boiler 5.

(Usually P. is 1 vd) At a lower pressure P3, the entire flow rate Ql passing through the impeller 27 returns to the water tank through the small hole 25 and the circulation tube 26 (this flow rate is set as q).
As a result, the flow rate Q2 from the discharge pipe 15 to the boiler 5 becomes zero, resulting in a situation similar to the above-mentioned shut-off state shown in FIG. 4.

This will be explained with reference to FIG.

In the figure, the horizontal axis represents the discharge amount Q (rrl/s), and the vertical axis represents the discharge pressure P (kg/i) and the required horsepower W (ps).

In the figure, Ql and Q2 are as described above, and q is the flow rate flowing back to the water storage tank 1 through the circulation capillary 26.

The curve ■ is the relationship between the discharge amount Q and the required horsepower W, and the curve ■ is the relationship between the discharge amount Q and the required horsepower W.
The relationship between l and P, and the curve ■ shown by the broken line, is Q2
The relationship between and P is shown.

The upper right diagram in FIG. 9 schematically shows this.

The pump type is not limited to a centrifugal pump, but if the pump is a centrifugal type, the required horsepower W also decreases as the flow rate Q decreases, and the major advantage is that the required horsepower at shut-off is reduced.
This is similar to FIGS. 4 and 5.

Now, the pressure inside boiler 5 is P.

If the circulation line 'f26 were not present, it would be at point A on the curve n, but because of the circulation thin tube 26, the flow rate decreases by q1 and moves to the upper point of the curve.

Since this flow rate q1 is small compared to the discharge amount of the pump 23, the decrease in volumetric efficiency is not a problem in practice.

Since the pump 23 is kept rotating at all times, the pressure in the boiler 5 gradually increases, and the flow rate Q1 moves along the curve l.
Ha, the flow rate Q2 gradually changes from the top to the second on the curve ■.

Then, when the pressure of boiler 5 reaches P2, q−q2=
Q1. The result is Q2-0 and the deadline is reached.

At this time, the flow rate q2 is larger than ql, but this flow prevents problems such as seizure of the impeller 27 and backing part due to heat even if the pump 23 is constantly rotating. Extend the life of 23.

Even if the water supply pump 23 is constantly rotating in this way, the pressure P of the boiler 5 remains P.

Since P≦P3<Po), it is safe even without the pressure switch 14, pressure tank 13, etc. as shown in FIG.
There is no discomfort or risk of burns due to changes in water temperature (as described in Figure 4) due to repeated startup and shutdown, and the lifespan is shortened by applying shock pressure to the boiler 5 during startup and shutdown. Problems such as flickering lights can be solved without having to do anything.

Note that the water supply pump 23 has the same effect whether it is attached to the side or above the water tank 1.

In addition, conventionally, when the water supply pump 23 was restarted after being stopped for a long period of time, air would accumulate inside the pump, and therefore the water would not be discharged for a long time. 23, air immediately escapes from the circulation tube 26, so that it can be discharged immediately upon activation.

Next, the boiler 5, hot water pipes 8, 8', piping 20,
The valves 17, 17', hot water pump 18, radiator 19, etc. are the same as in FIG. 4.

The valves 17, 17' are operated by the Java 6.6', the water hammer tank 5, and the water supply pump 23 by sudden closing of the hot water taps 7, 7'.
It is also possible to prevent the spread to the circulation tubules 26 and extend their lifespan.

Further, the locations where the air absorption device 22 can be attached are also the same as those described in FIG. 4.

Next, FIG. 8 shows another embodiment of the present invention.

Compared to the embodiment shown in FIG. 6, instead of connecting the circulation thin tube 26 to the casing high-pressure part 24 of the water supply pump 23 by opening a small hole 25, it is connected to the discharge pipe 15 that carries water from the water supply pump 15 to the boiler 5. The difference is that a circulation tube 28 that communicates with the water storage tank 1 is provided.

The inner diameter of the circulation thin tube 28 is made sufficiently smaller than the inner diameter of the discharge tube 15.

Here, considering the case where the water supply pump 23 is started by an electric motor or the like (not shown), air is often accumulated in the casing of the water supply pump 23, and therefore air is also sent to the discharge pipe 15. Since the circulation thin tube 28 communicates with the discharge tube 15, air escapes from the circulation thin tube 28 into the water storage tank 1 due to the small frictional resistance.

This point is an extremely large advantage for hot water devices such as boilers.

. In other words, when air is sent to the hot water device, it promotes corrosion and scale buildup on the inner surface of the hot water supply pipe 8, causing hot water to intermittently flow out from the hot water tap 7, causing problems such as splashing and dripping, and furthermore, the hot water pump This is because if 18 is attached, it may cause cavitation.

(The above-mentioned effect of not sending air to the hot water device has not been explained in the embodiment shown in Fig. 6, but it is clear that the same effect/effect is obtained in the case of Fig. 6.

) Next, when water is continuously supplied to the boiler 5, the pressure inside the boiler 5 gradually rises to the operating set pressure P.

approach. It would be dangerous if the pressure inside the boiler 5 rose any higher than that, so conventionally the water supply pump 11 was repeatedly started and stopped by the pressure switch 14 as shown in Fig. 2, but in the water supply system shown in Fig. 8, Even if the water supply pump 17 is constantly rotated, the pressure inside the boiler 5 does not exceed Po.

To explain this with reference to Figure 9, the figure shows that the horizontal axis is the flow rate Q (
m”/s), discharge pressure P (kg shoulder), and required horsepower W (Ps) are displayed on the vertical axis, and curve I is the water pump 23.
The curve {circle around (2)} shows the relationship between the discharge amount Q1 of the water supply pump 23 and the required horsepower W.

Next, the curve ■ shown by a broken line is the flow rate Q2 sent to the boiler 5.
This shows the relationship between the discharge pressure P of the water supply pump 23, and if the flow rate flowing back to the water storage tank 1 through the circulation tube 28 is q (÷'s), then Q2=QIQ.

Q becomes smaller as P becomes larger.

(Ho → Ha → I). On the other hand, q increases as P increases.

In other words, at the pressure P1 shown in the figure, q-ql,
At a pressure p2 greater than pl, C1=q2 and q2>(11).

Moreover, at pressure p2, q2 (12, Q2""O
tQ1=(12), and the entire amount discharged from the water supply pump 23 passes through the circulation thin tube 28 and is returned to the water storage tank 1.

As is clear from curve 1, the required horsepower at this time is extremely small, so power consumption, etc., can be reduced, and the pressure is constant at p2.

Therefore, the effects of the embodiment shown in FIG. 8 are almost the same as those shown in FIG. 6, and the explanation thereof will be omitted.

Of course, even if the pump 23 is operated for a long time in the closed state (two points in FIG. 9), the circulating flow q2 will not cause the pump 23 to heat up and cause any trouble.

In addition, in this invention, the type of water supply pump 23 is not limited to a centrifugal pump, and the inner diameter and length of the circulation thin tube 28 may be determined according to the characteristics of the pump.

Furthermore, it is clear that the position of the pump 23 with respect to the water tank 1 is not limited to the lower position as shown in FIG. 8, but the same effect can be achieved whether it is in a horizontal position or an upper position.

Next, depending on the case, a variable throttle may be interposed in the circulation capillary 28 to change the flow rate q shown in FIG. 9 so as to finely adjust the relationship between the curves (2) and (2).

In response to variations in the pump characteristics of the water supply pump 23 during mass production, the circulating flow rate q2 at the time of cut-off (Q2 = 0)
There is an advantage that q can be adjusted in accordance with the decrease in pump efficiency after long-term use.

Furthermore, depending on the case, it may be effective to provide a relief valve in the circulation thin tube 28.

If the set pressure of the relief valve is set slightly lower than p3 in Figure 9, then at a pressure lower than that set pressure, the curve ■ in Figure 9 will perfectly match the curve ■.
In a low pressure state, for example, pressure p1, ql-0
Therefore, volume loss can be eliminated.

Only when the set pressure is reached and the relief valve opens 1, does the flow rate Q2 to the boiler 5 match the curve (2).

Although not shown in the figure, one of the circulation thin tubes 28 is connected to the suction tube 10 without communicating with the water tank 1 because the pump 2
This is preferable when the distance between the suction pipe 10 and the water storage tank 1 is large, and it is also preferable to insert an IJ valve or a variable throttle valve in the circulation thin tube 28 connected to the suction pipe 10 as described above. Sometimes.

Boiler 5 and check valve 17 in the embodiment of FIG. 8
, 17' and the subsequent circuits are similar to those shown in FIG. 6 described above.

Next, Fig. 10 to Fig. 12 are shown in Fig. 3, Fig. 4, Fig. 6,
9 is a detailed view of the air absorption device 22 used in the circuit of the water supply and hot water supply apparatus of FIG. 8; FIG.

In FIG. 10, a communication pipe 31 is attached to the bottom 30 of a relatively tall sealed container 29, such as a cylinder or a prism.
Further, as shown in the figure, a projecting pipe 33 is provided in a portion of the side surface 32 near the bottom 30, and an automatic air vent valve 34 used for general heating is attached to the tip of the projecting pipe 33.

To explain the operation of the air absorption device 220 having such a configuration, the air absorption device 22 is installed at a point where the pipe is bent in an inverted U shape or at the upper part of the boiler (see 21 in Fig. 3). The communication pipe 31 communicates with the hot water in the piping and the hot water in the boiler.

Assume now that the inside of the closed container 29 is filled with hot water.

Explaining according to FIG. 3, when the cold water is heated in the boiler 5, the dissolved air separates and rises to the upper part 21, and then passes through the communication pipe 31 and forms air bubbles 35 as shown in FIG. It gradually accumulates on the top plate 36 of the airtight container 29, forming an air chamber 37.

As the air is further separated and accumulated, the air chamber 37 increases, the hot water level 38 decreases, and finally reaches the opening 39 of the protruding pipe 33 mentioned above.

Then, the state as shown in FIG. 11 occurs, and the hot water that was present in the automatic air vent valve 34 flows backward through the protruding pipe 33 and disappears, and from then on, all the air rising as bubbles 35 from the automatic air vent valve 34 is released into the atmosphere. Therefore, the hot water level 3
8 does not fall below the height of the opening 39.

On the other hand, if the air chamber 37 contracts due to pressure changes in the boiler or cooling of hot water, and the hot water level 38 rises a little, the opening 39 is immediately closed and the automatic air vent valve 34 is opened.
Air is no longer released, and the volume of the air chamber 37 does not change much regardless of the temperature of the hot water, and remains constant near the opening 39.

In addition, even if this air absorption device is installed in an inverted U-shaped part of the piping such as the discharge pipe 8゜8' in Fig. 3, where air tends to accumulate, the air will not accumulate in the same way as explained above. , an air chamber 37 is formed, and the hot water level 38 settles approximately in the vicinity of the opening 39.

Moreover, FIG. 12 shows this air absorption device 22 and an air separator 40 connected.

The air separator 40 consists of a separation box 41 and a separation plate 42, each having a diameter larger than the diameter d of the piping.As the inner diameter increases from d to D, the flow velocity is reduced in the separation box 41 and the air is separated. The effect is that the separation blade 4
2, integrating the air separator 40 and the air absorption device 22 as shown in FIG. 12 significantly improves the performance of air separation.

Note that the separation box 41 is not limited to a cylindrical shape, and can have various cross-sectional shapes.

In this way, compared to the conventional case where the automatic air vent valve 34 is directly attached to piping, etc., this air absorption device 22 has a larger area of the hot water surface 38 where the air and hot water come into contact, so the separation efficiency is improved. Even if a large amount of air is separated at once due to high water temperature and sudden changes in water temperature, etc., it is stored in the phlegm air chamber 37 and then released from the automatic air vent valve 34 on an average basis, so the air will not flow back into the piping etc. There is no longer any need to put it away.

Of course, the fact that the hot water level 38 does not fall below the opening 39 also effectively prevents air from flowing back into the piping.

Furthermore, there is an effect that instead of installing a large number of automatic air vent valves 34 in various places in the piping as in the conventional case, they can be installed only in one part.

Next, see Figures 3, 4, 6, 8, and 14 (described later).
When this air absorption device 22 is attached to the water and hot water supply circuits shown in FIGS. 16 and 18, the following effects can be obtained.

(b): Prevention of water hammer.

When the Java 6.6', hot water tap T, etc. are suddenly closed, water hammer is not generated in the discharge pipes 8, 8', but this air absorption device 22 has an air chamber 37 of approximately constant volume. Therefore, the elasticity of the air chamber 370 prevents water hammer, thereby extending the life of the valves 17, 17, piping, etc.

Furthermore, if it is attached to the boiler 5 or piping 20, the shock wave can be alleviated and the boiler 5, radiator 19, pressure tank 13, etc. Protects the pressure switch 14 etc. and extends its life.

(b): Reduce pressure fluctuations.

0), the elastic buffering effect of the air chamber 37 reduces pressure fluctuations in the boiler 5, discharge pipes 8, 8', etc.
．． The amount of hot water supplied from 6' and the hot water taps 7, 7' is constant, allowing for safe and comfortable use.

In addition, since the pressure fluctuation is small, the flow rate of hot water is constant, and the amount of heat radiated by the radiator 19 can be kept constant, and the boiler 5
can significantly extend the fatigue life of

, 09: Noise prevention.

This air absorption device 22 can separate a large amount of air from the large-area hot water surface 38, and since it does not cause air to flow back into the piping as described above, air hardly ever enters the piping. It is extremely effective in noise prevention.

In particular, if it is attached to the piping 20 or the boiler 5, it is effective in preventing noise from the fin portion of the radiator 19.

): The volumetric expansion when water is heated in boiler 5 can be released.

The air chamber 31 is sufficiently large compared to the volumetric expansion, so it is safe.

@9: Improving the thermal efficiency of the heat sink 19.

As described above, since the dissolved air in the hot water is reliably removed and is not allowed to flow back, no air is mixed into the piping 20, and the thermal efficiency of the radiator 20 is significantly improved.

(f): Prevent corrosion and scale buildup inside piping.

As described above, the air absorption device 22 has this effect because it reliably removes dissolved air from the hot water and prevents it from flowing back.

(G): Preventing cavitation of the hot water pump 18.

It is effective when attached to the suction piping of the boiler 5 or the hot water pump 18, but in particular, one that is integrated with the air separator 40 shown in FIG. 12 is often effective.

Furthermore, there is also the effect that the volumetric efficiency of the hot water supply pump 18 can be improved.

Next, the electric circuit diagram shown in FIG. 13 is as follows:
It can be used as needed in the water supply and hot water supply apparatus shown in FIG. 8 and the like.

43 is a switch and if you press this, heater 4 for boiler 5
4 and the electric motor 45 for the water supply pump 23 can be energized at the same time, which has the effect of preventing the boiler 5 from running dry.

Next, FIG. 14 shows another embodiment of the present invention.

When compared with the configuration of the embodiment shown in FIG. 3, only the water supply device 9 is different, and the boiler 5, discharge pipes 8, 8', and others are the same.

This water supply device 9 is characterized in that a check valve 12 and a pressure valve 46 are interposed in the circuit of the discharge pipe 15 of the water supply pump 23.

A water supply pump 23 pumps water from a water storage tank 1 having a ball tap 2 through a suction pipe 10 to a suction pipe 15, but a check valve 12 and a pressure valve 46 are interposed in the discharge pipe 15, and the spool position is set to the boiler. When the pressure of the boiler 5 is low, the boiler 5 is opened, and when the pressure of the boiler 5 reaches the set pressure, it is sensed in the discharge pipe 15 section connecting the pressure valve 46 and the boiler 5, and the valve 46 is opened. In order to switch the spool, a pilot pipe 4T is installed as shown in the figure, and when the spool is switched, the entire amount of water discharged from the pump 23 will flow back into the water tank 1 through the return pipe 48.

Java 6.6', hot water tap 7. If the pressure in the boiler 5 decreases due to the use of T' or the like, the decrease is sensed from the pilot pipe 41 and the spool is returned to its original position by the spring 49, and water from the water supply pump 23 goes to the tank 5.

In this way, the pressure of the boiler 5 is kept almost constant, and the water supply pump 23 is constantly rotating, so compared to the water supply system shown in Fig. 2, which repeatedly starts and stops, the pressure of the boiler 5 is kept almost constant. There is no problem of darkening or flickering of the electrolyte due to current flow, extending the life of the electric motor.

In addition, in the case of this water supply circuit, the characteristics of the pump 23 can be selected more freely than in the previously described embodiments.

Next, the action of the check valves 17, 1γ is the same as in FIGS. 4 and 6.

However, in the case of Figure 14, Java 6.6' and hot water tap 7
, 7' is suddenly closed, a sudden pressure increase occurs in tanks 5, 7'.
The valve 17゜1 prevents the spool of the pilot pulp 46 from being transferred through the discharge pipe 15 and the pilot pipe 47 and switching the spool regardless of the pressure in the tank 5 being low.
7' and protects the pressure valve 46.

Note that the check valve 12 functions to prevent backflow from the boiler 5 to the water storage tank 1 when the water supply pump 23 is stopped.

Next, FIG. 15 shows another embodiment of this invention.
The pilot pipe 47 in FIG. 4 is replaced with a pressure switch 14 and electric wiring 50, and the pressure pulp 46 is replaced with a solenoid valve 51.

The action and effect are the same as in the case of Fig. 15.

Next, FIG. 16 shows another embodiment of the present invention.
FIG. 7 is an electrical circuit diagram of the pressure switch 14, solenoid valve 51, and electric motor 45 for the water supply pump 23 shown in FIG. 16, and unlike FIG. 15, the check valve 12 is omitted.

Here, if the switch 52 is set to "close", the electric motor 45 and the solenoid valve 51 are both set to rONJ, the water supply pump 23 is started, the spool of the solenoid valve 51 is switched, and water is supplied from the discharge pipe 15 to the boiler 5. be done.

When the pressure of the boiler 5 rises and reaches the upper limit set pressure of the pressure switch 14, the switch 14 shown in FIG. The water is
As shown in FIG. 16, the water flows back to the water storage tank 1 through the return pipe 48.

The pump 23 is constantly rotating even in this state, but the pressure is maintained only by the resistance of the discharge pipe 15, the return pipe 48, etc., and the discharge pressure is low, thus maintaining a long service life of the water supply pump 23.

When hot water is used by opening the Java 6, 6' and hot water taps I and 7', the pressure in the boiler 5 decreases, and when it reaches the lower limit set pressure of the pressure switch 14, the pressure switch 14 closes and the solenoid The spool of the valve 51 is switched and water is sent to the boiler 5.

In this way, the pressure of the boiler 5 is kept almost constant, and the water supply pump 23 is constantly rotating, so a large instantaneous current flows, compared to the water supply system shown in Fig. 2, which repeatedly starts and stops. The life of the electric motor 45 is extended without making the electrolyte dark or flickering.

In addition, in the case of this water supply circuit, the characteristics of the pump 23 are as follows:
Compared to FIG. 4, FIG. 6, FIG. 8, etc., selection can be made more freely.

However, at the upper limit setting pressure of the pressure switch 14, the discharge amount Q
This is because even if the amount of water is not very small, the return pipe 48 can be made large in diameter to allow reflux.

Next, the action of the check valves 1γ and 17' is shown in FIGS. 4 and 6.
As in the figures, it protects the boiler 5 and pressure switch 14.

Next, when stopping the water supply pump 23, switch 5
2 is set to "open", but at this time, as is clear from FIG. 17, both the electric motor 45 and the solenoid valve 51 are at rQFFJ, so the spool position of the solenoid valve 51 becomes as shown in FIG. 16, and the boiler 5 It can reliably prevent the hot water inside the tank from flowing back into the water tank.
Therefore, a check valve is not required in either the suction pipe 10 or the discharge pipe 15.

Next, FIG. 18 shows another embodiment of the present invention.

The water tank 1 has a ball tap 2, and a water supply pump 23 is placed below the water tank 1 to pump water from the water tank 1 into the suction pipe 1.
A water supply device 9 consisting of the water storage tank 1 and the water supply pump 23 described above is installed on the top of the boiler 5, and the water discharged from the water supply pump 23 is sent to the boiler 5 through the discharge pipe 15. It is something.

This embodiment corresponds to the embodiment shown in FIG. 6, and the water supply pump 23 is provided with a circulation thin tube 26 for returning water to the water storage tank 1.

With this configuration, the operation is almost the same as in Figure 6, but
The only difference is that in FIG. 18, even if the air absorption device 22 is attached to the upper part 21 of the boiler 5 or the piping 20 if necessary, the air will not flow back from the boiler 5 to the water storage tank 1 when the pump 23 is stopped. .

Furthermore, the boiler 5 and the water supply device 9 can be installed extremely compactly even in a narrow space.

In addition, the pump 23 can also be placed beside or above the water tank 1 if necessary.

Furthermore, as mentioned above, although FIG. 18 corresponds to FIG. 6, the circuits corresponding to FIG. 3, FIG. 4, FIG. 8, FIG. 14, and FIG. If the water supply device 9 shown in the figure is installed above the boiler 5, backflow from the boiler 5 to the water tank 1 can be reliably prevented. The valve 12 becomes unnecessary, and even in circuits where the air absorption device 22 cannot be attached to the boiler 5 or piping 20, it can be attached.

Of course, if necessary, we can also use a regular automatic air vent valve for hot water.
It can be freely attached to the boiler 5 and piping 20.

The function of the check valves 17 and 17' is similar to that of the other embodiments described above, and is to protect the boiler 5 and the water supply pump 23 and extend their lifespan.

As explained in detail above, the present invention comprises: a water supply device 9 consisting of a water storage tank 1 and a water supply pump 11; a boiler 5 for heating water sent from the water supply device 9; Hot water pipes 8, 8' that send hot water to hot water taps 7, 7'
Check valves 17 and 1 installed in the hot water supply pipes 8 and 8'
Since the water supply and hot water supply device is equipped with a check valve 17 and a check valve 17, it does not take up much space and installation work is easy and simple.
17' prevents the water hammer boiler 5 and water pump 23 from being affected by the sudden closing of the jaws 6, 6' and the hot water taps 7, 7', thereby extending their lifespans.

Moreover, a sealed container 2
9 and an automatic air vent valve 34.
is provided, the air inside the hot water supply pipes 8, 8' can be absorbed by the air absorption device 22 to prevent internal corrosion and scaling of the hot water supply pipes 8, 8', and the hot water taps 7, 7
This eliminates the inconvenience of hot water intermittently flowing out and splattering.

Also, due to the elastic buffering action of the air absorption device 22, the check valve 17
, 17' jaw 6.6' and hot water taps 7, 7' can be prevented, and therefore the check valve 1
7. ．． 17' and the hot water supply pipes 8, 8' are also extended in life.

Furthermore, due to the above-mentioned elastic buffering effect, pressure fluctuations in the hot water supply pipe 8°8' are reduced, and the amount of hot water supplied from the Java 6.6' and the hot water tap 7.7' remains constant, allowing for safe and comfortable use.

Furthermore, since there is little pressure fluctuation, the flow rate of hot water can be kept constant.

[Brief explanation of drawings]

Figures 1 and 2 are circuit diagrams of a conventional water supply and hot water supply system, Figures 3 and 4 are circuit diagrams showing an embodiment of the present invention, Figure 5 is a characteristic diagram of a water supply pump, and Figure 6 is a diagram of the present invention. Another embodiment of the invention, FIG. 7, a detailed sectional view of the vicinity of the water supply pump in FIG. 6, FIG. 8, a circuit diagram showing another embodiment of the invention, FIG. Figure 8 is a characteristic diagram of the water supply device, Figures 10 and 11 are cross-sectional views of the air absorption device, Figure 12 is a cross-sectional view when the air separator is connected to the air absorption device, and Figure 13 is the electrical 14 and 15 are circuit diagrams of a water supply and hot water supply device showing another embodiment of the present invention, and FIG. 16 is a circuit diagram of a water supply and hot water supply device showing another embodiment of the present invention, and FIG. 17 FIG. 16 is an electric circuit diagram used, and FIG. 18 is a water supply and hot water supply device showing another embodiment of the present invention. 1...Water tank, 2...Ball tap, 5...Boiler, 6.6'...Java, 7,7'...Hot water tap, 8
, 8'... Hot water pipe, 9... Water supply device, 10... Suction pipe, 11... Water supply pump, 12... Check valve, 13
...Pressure tank, 14...Pressure switch, 15...
・Discharge pipe, 17, 17'...Valve, 18...Hot water pump, 19...Radiator, 20...Piping, 22...
Air absorption device, 23... Water supply pump, 24... Casing high pressure section, 26.28... Circulation thin tube, 29...
Airtight container, 34... Automatic air vent valve, 37... Air chamber, 40... Air separator, 43... Switch, 44...
- converter, 45... electric motor, 46... pressure valve, 48... return pipe, 51... solenoid pulp.

Claims (1)

[Claims] 1 A water supply device 9 consisting of at least a water storage tank 1 and a water supply pump 11; A boiler 5 that warms the water sent from the water supply device 9; From this boiler 5 to Java 6, 6' and hot water taps 7, 7' A hot water supply device comprising a hot water supply pipe 8°8' for sending hot water; and a check valve 17°11' installed in the hot water supply pipe 8, 8', valve 7,
An air absorption device 22 is provided between the hot water supply pipes 8 and 7' and the hot water supply taps 7 and 7', and the air absorption device 22 projects upward from the hot water supply pipes 8 and 8' through a connecting pipe 31. A water and hot water supply device comprising: a sealed container 29; and an automatic air vent valve 34 protruding from a midway point in the vertical direction of the sealed container 29 via a projecting pipe 33.