JPH0684844B2 - Water supply device for hot water storage type water heater - Google Patents

Description

Description: FIELD OF THE INVENTION The present invention relates to a water supply device for a hot water storage water heater, and more particularly to a water supply device for a hot water storage system having a hot water storage tank or a hot water supply system having a relief valve in a hot water supply side circuit thereof. It is a thing.

In addition, by changing the water supply pressure during hot water supply and when hot water supply is stopped, the water supply pressure in the hot water supply system equipped with a relief valve can be increased and the hot water supply capability of the hot water storage water heater can be improved. is there.

[Prior Art and its Problems] In a hot water supply system using a hot water storage type water heater, as shown in FIG. 4, in order to prevent the internal pressure of a hot water storage tank (hereinafter referred to as a can body) of the water heater from rising abnormally, While inserting the pressure reducing valve (3) in the water supply circuit (2) to the water heater (1),
The relief valve (5) is inserted into the hot water supply circuit (4) on the downstream side including the hot water supply device (1). The pressure reducing valve (3) is a control valve for keeping the feed water pressure constant, and maintains the pressure on the secondary side at the set pressure regardless of the pressure fluctuation on the primary side. The other relief valve (5) is a so-called safety valve for preventing the internal pressure of the can body (10) of the water heater (1) from rising above a certain level, and is a hot water supply circuit (4) including the can body (10). When the internal pressure of the hot water supply circuit (4) exceeds the set pressure when the pressure reducing valve (3) and the hot water supply faucet are both closed when the hot water supply is stopped, etc. It is opened to reduce the internal pressure.

Therefore, with this piping system, the disadvantage that the can body (10) is in an overpressure state can be prevented, and hot water can be supplied safely.

However, it is said that the hot water supply system including the conventional water supply device cannot secure sufficient hot water supply capacity even if the heat source device and the water supply circuit (2) included in the water heater (1) have sufficient water supply pressure. There's a problem.

This is because even if the set pressure of the relief valve (5) is set to a pressure near the allowable pressure of the can body (10), water must be supplied at a pressure significantly lower than this pressure.

That is, the operating pressure of the relief valve (5) is the pressure at which the communication circuit opens when the communication circuit exceeds a certain pressure: the blowing start pressure (P ₁ ), and the communication circuit is opened to the atmosphere side after the opening. reduced pressure Te, relief valve (5) the pressure at the time of closing: There is a吹止Me pressure (P _2), fixed between the吹始Me pressure (P ₁₎ and吹止Ri pressure (P ₂₎ This is because there is a pressure difference (dp), and the feed water pressure must be set to a pressure slightly lower than the blowoff pressure (P ₂ ).

In other words, if the pressure set by the pressure reducing valve (3) is set to a pressure close to the blowing start pressure (P ₁ ), no problem will occur during the initial hot water supply. However, when the volume of the circuit of the hot water supply circuit (4) including the can body (10) expands due to the operation of the heat source device in the water heater (1) once the hot water supply is stopped, this internal pressure Reaches the pressure (P ₁ ) at the beginning of blowing and the relief valve (5) operates. This causes the internal pressure of the hot water supply circuit (4) to drop, but the set pressure of the pressure reducing valve (3) is set to a pressure close to the above-mentioned blow start pressure (P ₁ ) (higher than blow-off pressure (P ₂ )). Therefore, the water is supplied at this set pressure, the pressure in the hot water supply circuit (4) does not drop to the blowoff pressure (P ₂ ), and the relief valve (5)
Drainage continues.

Therefore, in order to prevent such inconvenience, it is necessary to set the set pressure of the pressure reducing valve (3) to a pressure equal to or lower than the blow stop pressure (P ₂ ). Actually, the permissible pressure of the can body (10) is 1.
In the case of 0 kg / cm ² , the blowing start pressure (P ₁ ) is set to 0.9 kg / cm ^2, and the set pressure of the pressure reducing valve (3) is set to about 0.65 kg / cm ² .

In this way, in the conventional hot water supply system, water is supplied at a pressure significantly lower than the allowable pressure of the can body (10), and the hot water supply capacity (hot water supply amount per unit time) is not sufficient for that. is there.

The present invention has been made in view of the above point, and a depressurizing means for maintaining the secondary side pressure at the set pressure is inserted in the water supply circuit (2) on the upstream side of the water heater (1), and the water heater ( The relief valve (5) in the hot water supply circuit (4) including the can body (10) on the downstream side of 1)
In order to improve the hot water supply capacity, it is necessary to make the water supply pressure during hot water supply close to the blowing start pressure (P ₁ ). This is a technical issue.

* Regarding the invention of claim 1 [Technical means] The technical means of the present invention taken to solve the above technical problem is that "the depressurizing means comprises a first depressurizing means and a second depressurizing means, and The pressure set to the secondary side of the first pressure reducing means is set to a pressure close to and lower than the blow start pressure (P ₁ ) of the relief valve (5), and the pressure set to the secondary side of the second pressure reducing means is released ( The pressure near the blow-off pressure (P ₂ ) of 5) is set to a pressure close to and below this, and a water flow sensor (S) that detects the presence or absence of water flow is inserted in the water supply circuit (2) or hot water supply circuit (4). A switching means is provided for switching one of the first and second depressurizing means into an operating state by the output of the sensor (S), and the switching means outputs the first depressurizing pressure by the output of the water flow sensor (S) at the time of water flow detection. Only the means is activated, and the output of the water flow sensor (S) is detected when the water flow is not detected. Therefore, only the second pressure reducing means is put into the working state. "

[Operation] The above technical means of the present invention operates as follows.

When the hot water supply circuit (4) on the downstream side of the water heater (1) is opened and hot water supply is started, the water supply circuit (2) and the hot water supply circuit (4)
A water flow occurs in the water flow sensor, and the water flow sensor (S) detects this water flow, and the output at this time causes the switching means to activate the first pressure reducing means. Therefore, the water supply pressure at this time is
The set pressure on the secondary side is set by the action of the first pressure reducing means, water is supplied at a pressure near the blowing start pressure (P ₁ ), and the hot water supply pressure also matches this pressure. In addition,
The secondary-side set pressure at this time may be the set pressure when water is passed, and may be a secondary pressure setting that is equal to or higher than the set pressure when water is stopped. For example, the case where the pressure reducing means such as the orifice is the first pressure reducing means corresponds to this case.

Next, when the hot water supply is stopped, the output of the water flow sensor (S) at this time causes only the second pressure reducing means to be in the operating state, and the water supply circuit (2) downstream of the pressure reducing means and the can body (10).
The circuit of the hot water supply circuit (4) including is the pressure set by the action of the second pressure reducing means. Therefore, when this circuit rises to a pressure equal to or higher than the blowing start pressure (P ₁ ) of the relief valve (5), the relief valve (5) operates to open and drain the water, thereby lowering the internal pressure of the circuit.

Then, when the circuit internal pressure drops to the blow-off pressure (P ₂ ), the pressure on the secondary side of the pressure reducing means is set to be equal to or lower than the blow-off pressure (P ₂ ), so that the drainage is stopped.

As described above, the hot water supply circuit (4) including the can body (10) is supplied with hot water at a pressure higher than the blow-off pressure (P ₂ ) when hot water is supplied, and the relief valve (5) operates. At times, it will be maintained below the blow-off pressure (P ₂ ).

[Effects] The present invention having the above-described configuration has the following unique effects.

The hot water supply circuit (4) including the can body (10) is supplied with a pressure higher than the blow-off pressure (P ₂ ) when hot water is supplied, and when the relief valve (5) is activated Since the pressure is maintained below the pressure (P ₂ ), drainage does not continue after the relief valve (5) is actuated, and the hot water supply capacity can be improved.

* Regarding the invention of claim 2 This invention achieves the same object as the invention of claim 1 and exhibits the same effect. And the technical means for this is as follows: "The pressure reducing means is a pressure reducing valve (3),
The fixed end of the secondary pressure adjusting spring (33) of the pressure reducing valve (3) is made movable in the axial direction, and the urging force of the secondary pressure adjusting spring (33) is switched between the first setting state and the second setting state. The output part of the switching means is coupled to the fixed end, and in the first setting state, the secondary pressure of the pressure reducing valve (3) is close to the blow start pressure (P ₁ ) of the relief valve (5) and lower than this. Second with pressure
In the set state, the secondary pressure of the pressure reducing valve (3) is close to and below the blow-off pressure (P ₂ ) of the relief valve (5), and the water flow to the water supply circuit (2) or hot water supply circuit (4). A water flow sensor (S) that detects the presence or absence of the water flow sensor (S) is inserted, and the switching means sets the secondary pressure of the pressure reducing valve (3) in either one of the first and second setting states according to the output of the water flow sensor (S). The switching means sets the secondary pressure of the pressure reducing valve (3) to the first setting state by the output of the water flow sensor (S) at the time of water flow detection, and the water flow sensor (S) at the time of no water flow detection. The second setting state is set according to the output. ”

With this technical means, when hot water is supplied, the switching means operates according to the output of the water flow sensor (S) so that the secondary pressure of the pressure reducing valve (3) is in the first setting state. Conversely, when hot water supply is stopped, The switching means brings the secondary pressure of the pressure reducing valve (3) into the second setting state. As a result, the same operation as that of the first aspect of the invention is achieved.

Therefore, in the invention of claim 2, one pressure reducing valve (3)
Since the secondary pressure is changed in two steps by the method, in addition to the effect of the invention of claim 1, there is an advantage that the circuit configuration of the water supply circuit can be simplified.

[Embodiment] An embodiment of the present invention will be described below with reference to FIGS. 1 to 3.

In the first embodiment shown in FIG. 1, the pressure reducing means is a first pressure reducing valve (3
1) and the second pressure reducing valve (32), these parallel circuits are inserted into the water supply circuit (2), and one of the first pressure reducing valve (31)
The secondary side pressure of the hot water heater (1) is set at a pressure close to and lower than the blow start pressure (P ₁ ) of the relief valve (5) inserted in the downstream side of the can body (10). The other second pressure reducing valve (32) is set to a pressure near the blow-off pressure (P ₂ ) of the relief valve (5) and lower than this.

And, in the circuit equipped with one first pressure reducing valve (31),
A solenoid valve (21) as a switching means is inserted.

The output of the water flow sensor (S), which is a water flow switch inserted in the hot water supply circuit (4), is input to the solenoid valve (21). In this embodiment, an electric circuit as shown in FIG. There is.

That is, the normally open output contact of the water flow sensor (S) is inserted in series in the electric circuit of the solenoid valve (21).

Therefore, when hot water supply is started, the normally open output contact of the water flow sensor (S) is closed, the solenoid valve (21) is opened, and the first pressure reducing valve (31) and the second pressure reducing valve (32) are opened. Both become operational,
The water supply pressure of the water supply circuit (2) is the first pressure reducing valve (3
It will correspond to the pressure set by 1). That is, the first pressure reducing valve (31) serving as the first pressure reducing means is brought into the operating state, and hot water is supplied at a pressure near the allowable pressure of the can body (10).

Then, when the hot water supply is stopped, the normally open output contact of the water flow sensor (S) is revised and the solenoid valve (21) is closed, so that the water supply pressure is set only by the second pressure reducing valve (32). Becomes That is, the second pressure reducing valve (3
2) becomes the operating state, and the pressure is set to a pressure near the blow-off pressure (P ₂ ) and lower than this.

Incidentally, as a modification of the first embodiment, it is also possible to adopt a configuration like the second embodiment shown in FIG.

In the second embodiment, the first pressure reducing valve (31) and the second pressure reducing valve (32) are connected in series, and the second pressure reducing valve (3
A bypass circuit (22) that bypasses 2) is provided, and a solenoid valve (21) is inserted into this bypass circuit (22).

Also in the case of this configuration, if the solenoid valve (21) and the water flow sensor (S) provided in the hot water supply circuit (4) are made to have the same electrical relationship as in FIG. The solenoid valve (21) is opened by the output contact, and the first
Hot water is supplied at the water supply pressure set by the pressure reducing valve (31),
When the hot water supply is stopped, the hot water supply circuit (4) is maintained at the pressure set by the second pressure reducing valve (32). In the above two embodiments, the first pressure reducing valve may be replaced with a pressure reducing means such as an orifice which maintains the set pressure on the secondary side when water is passed.

Next, the third embodiment shown in FIG.
The pressure reducing means and the second pressure reducing means are incorporated to change the urging force of the secondary pressure adjusting spring (33) into two states by the electromagnetic driver (6) as the switching means.

Therefore, as shown in FIG. 3, the pressure reducing valve (3) is electromagnetically driven to drive the fixed end of the secondary pressure adjusting spring (33) whose free end is in contact with the diaphragm and whose other end is fixed. It is equipped with a vessel (6). Then, the secondary pressure adjusting spring (3
The output shaft (61) of the electromagnetic drive (6) is made to face the distal end cylinder portion (34) of the spring cover that houses the output shaft (6).
Set the operation stroke of 1) to a constant value so that the fixed end of the secondary pressure adjusting spring (33) is pushed in by a constant stroke when the output shaft (61) advances while the electromagnetic drive (6) is operating. It has become. As shown in the figure, when the electromagnetic drive (6) is in the non-actuated state, the output shaft (61) is in the initial position and the spring receiver (35) is located at the position shown by the solid line in the figure. At this time, the set secondary pressure of the pressure reducing valve (3) is set to the same secondary pressure as the second pressure reducing valve (32) of the first embodiment, and is in the second setting state.

Then, when the electromagnetic drive (6) is activated, the spring bearing (35)
Is pushed into the state of the imaginary line in the figure, and the secondary pressure set by the pressure reducing valve (3) at this time is set similarly to the secondary pressure of the first pressure reducing valve (31) of the first embodiment, It is in the first setting state.

Then, the electromagnetic driver (6), as shown in FIG.
The operation is controlled by turning on / off the normally open output contact of the water flow sensor (S) inserted in the hot water supply circuit (4). Therefore, in the hot water supply state, the water flow sensor (S) is activated, the output contact is closed, the electromagnetic driver (6) is activated, the output shaft (61) is in the advanced state, and the secondary pressure is The first setting state is set. That is, the hot water supply pressure is maintained near the blowing start pressure (P ₁ ).

Then, when the hot water supply is stopped, the output contact of the water flow sensor (S) is opened and the electromagnetic driver (6) returns to the non-operating state. Therefore, the spring force is applied by the secondary pressure adjusting spring (33). (35) returns to the initial position, and the secondary pressure of the pressure reducing valve (3) becomes the second set state. That is, the pressure is set to a pressure near the blow-off pressure (P ₂ ).

In this way, the third embodiment also functions similarly to the above-mentioned respective embodiments.

Although the water flow sensor (S) is inserted in the hot water supply circuit (4) in the above embodiment, the same function can be achieved by inserting it in the water supply circuit (2).

In addition, in the third embodiment, the output shaft (61) is directly moved linearly in order to change the biasing force of the secondary pressure adjusting spring (33) in two steps. ) May be an electromagnetic drive (6) of a type in which it reciprocally rotates at a constant angle. In this case, the spring holder (3
5) is made to be a pair of screws, and the output shaft (61) and the distal end tube portion (34) are allowed to move away.

[Brief description of drawings]

FIG. 1 is an explanatory view of the first embodiment of the present invention, FIG. 2 is an explanatory view of the essential parts of the second embodiment, FIG. 3 is an explanatory view of the essential parts of the third embodiment, and FIG. 4 is a conventional example. It is an explanatory view of, in the figure, (1) …… hot water heater (5) …… relief valve (10) …… can body (S) …… water flow sensor (2) …… water supply circuit (4) …… hot water supply Circuit (P ₁ ) …… Blow start pressure (P ₂ ) …… Blow off pressure

Claims (2)

[Claims] 1. A can body (10) on the downstream side of the water heater (1) in which a pressure reducing means for maintaining the secondary pressure at a set pressure is inserted in the water supply circuit (2) on the upstream side of the water heater (1). Hot water supply circuit (4)
In the hot water supply system of the type in which the relief valve (5) is inserted into the pressure reducing means, the pressure reducing means is composed of the first pressure reducing means and the second pressure reducing means, and the secondary side set pressure of the first pressure reducing means is released into the relief valve (5). Pressure near the blow start pressure (P ₁ ) of the second pressure reducing means and the pressure near the blow stop pressure (P ₂ ) of the relief valve (5). A water flow sensor (S) for detecting the presence or absence of a water flow is inserted into the water supply circuit (2) or the hot water supply circuit (4) at the following pressures, and the output of this water flow sensor (S) determines which of the first and second decompression means. A switching means is provided for switching one of them into an operating state, and the switching means puts only the first pressure reducing means into an operating state by the output of the water flow sensor (S) at the time of water flow detection, and the water flow sensor ( Only the second pressure reducing means is activated by the output of S). Hot water storage type water heater of water supply equipment. 2. A depressurizing means for maintaining a secondary pressure at a set pressure in a water supply circuit (2) upstream of a water heater (1), and a can body (10) downstream of the water heater (1). Hot water supply circuit (4)
In a hot water supply system in which a relief valve (5) is inserted in the pressure reducing means, the pressure reducing means is a pressure reducing valve (3), and a fixed end of a secondary pressure adjusting spring (33) of the pressure reducing valve (3) is movable in an axial direction. The output portion of the switching means for switching the urging force of the secondary pressure adjusting spring (33) between the first setting state and the second setting state is paired with the fixed end, and in the first setting state, the pressure reducing valve (3) The secondary pressure is set to a pressure in the vicinity of the blow start pressure (P ₁ ) of the relief valve (5) and lower than this pressure, and the secondary pressure of the pressure reducing valve (3) of the relief valve (5) in the second setting state. Water flow sensor (S) that detects the presence or absence of water flow in the water supply circuit (2) or hot water supply circuit (4) by setting the pressure close to and below the blow-off pressure (P ₂ ).
Is inserted, and the switching means switches the secondary pressure of the pressure reducing valve (3) to one of the first and second setting states by the output of the water flow sensor (S). The switching means sets the secondary pressure of the pressure reducing valve (3) to the first setting state by the output of the water flow sensor (S), and sets it to the second setting state by the output of the water flow sensor (S) when the water flow is not detected. Water supply device for hot water storage type water heater.