JPH10253159A - Hot water heater provided with additionally burning circuit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent water from being discharged to the outside of a hot water heater by providing a blow valve on a bypass passage that bypasses an opening/closing valve provided on a hot water pouring passage located between a hot water supply circuit and an additional burning circuit for opening the valve to permit a flow to an additional burning circuit side when pressure of the hot water supply circuit side exceeds predetermined pressure. SOLUTION: In a hot water supply circuit 2, water supplied from a water supply source 23 is heated uoon its passing through a heat exchanger 21, and is eluted from a water supplycock 22. An additional burning circuit 3 includes a pump P and an additional burning circuit 3, and in a hot water pouring circuit 4 a hot water effluent side of the hotwater supply circuit 2 and the additonal burning circuit 3 are connected. On the hot water pouring passage 4 a solenoid opening/closing valve 41 is disposed and a bypass passage 5 that bypasses the opening/closing valve 41 is provide where a blow valve 51 being a kind of a check valve is provided. Hereby, when high pressure is produced on the hot water supply circuit 2, the blow valve 51 is opened to cause hot water in the hot water supply circuit 2 to flow into the additional burning circuit 3, and hence an abnormal high pressure state in the hot water supply circuit 2 is prevented and each part of the hot water supply circuit 2 is prevented from being damaged.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot water supply apparatus with additional heating, which can perform hot water supply, additional heating and filling with one unit.

[0002]

2. Description of the Related Art Generally, a hot water supply apparatus with additional heating includes a hot water supply circuit, a additional heating circuit, and a hot water path provided therebetween. The hot water path is provided with an on-off valve. The on-off valve is closed at the time of hot water supply and additional heating, but is opened at the time of hot water supply, and supplies the water heated by the hot water supply circuit to the bathtub through the hot water supply path and the additional heating circuit. (See Japanese Utility Model Application Laid-Open No. 5-25251).

[0003] In the hot water supply circuit, when the faucet for hot water supply is closed instantaneously, a high pressure called a so-called water hammer may be generated due to other causes.
When such a high pressure is generated, each part of the hot water supply circuit, particularly, the heat exchanger may be damaged. Therefore, in a conventional hot water supply apparatus, a blow valve is installed in a hot water supply circuit. The blow valve opens when the pressure in the hot water supply circuit exceeds a predetermined pressure. When the blow valve opens, hot water in the hot water supply circuit is discharged to the outside. Therefore, the inside of the hot water supply circuit does not become higher than the predetermined pressure, and each part of the hot water supply circuit can be prevented from being damaged.

[0004]

However, in the conventional hot water supply apparatus, hot water in the hot water supply circuit is simply discharged to the outside of the housing of the apparatus or to the inside of the housing when the blow valve is opened. . If the hot water is discharged to the outside of the housing, there is a possibility that a misunderstanding such as a failure such as water leakage may occur. On the other hand, if the water is discharged into the housing, corrosion may occur in the water heater.

[0005]

According to a first aspect of the present invention, there is provided a hot water supply path between a hot water supply circuit and a reheating circuit, the hot water supply circuit being connected to a hot water supply circuit. In a hot water supply device with additional heating provided with an on-off valve in the path, a bypass path that bypasses the on-off valve is provided in the hot water path,
In this bypass path, the flow from the reheating circuit side to the hot water supply circuit side is always blocked, and when the pressure on the hot water supply circuit side exceeds a predetermined pressure, the valve is opened and the hot water supply circuit side is switched to the reheating circuit side. The blow valve that allows the flow to the air is provided.

In this case, a passage that forms a part of the hot water path is formed in the casing, and the on-off valve,
It is desirable to provide the bypass and the blow valve. Also, on the outer surface of the casing, a mounting hole communicating from the open / close valve to the passage on the hot water supply circuit side, a communication hole communicating from the open / close valve to the passage on the reheating circuit side, and the mounting hole A communication groove for communicating with the communication hole is formed, and a mounting member for shielding the mounting hole, the communication hole and the communication groove is provided, and the mounting path, the communication hole, the communication groove and the shielding member form the bypass path. It is preferable that the check hole be provided in the mounting hole. Also, a flow from the hot water supply circuit side to the hot water supply circuit side is allowed from the open / close valve to the hot water path on the hot water supply circuit side, and a flow from the hot water supply circuit side to the hot water supply circuit side is prevented. First and second check valves are provided, and the first and second check valves are provided.
It is desirable to connect the end of the bypass passage on the reheating circuit side between the check valves. Further, it is desirable to provide the first and second check valves in the casing.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. FIG. 1 shows a schematic configuration of the entire hot water supply device 1 with additional heating according to the present invention. The hot water supply device 1 has a hot water supply circuit 2, an additional heating circuit 3, and a hot water path 4.

The hot water supply circuit 2 has a hot water supply heat exchanger 21. When a hot water tap 22 is opened, water supplied from a water supply source 23 is heated by a burner 24 when passing through the heat exchanger 21. The hot water is supplied from the water tap 22.

The reheating circuit 3 has a pump P for circulating hot water in the bathtub 31 and a reheating heat exchanger 32. The pump P draws the water from the bathtub 31 into the reheating circuit 3. When hot water passes through the heat exchanger 32, the burner 3
3 and then returned to the bathtub 31.

The hot water path 4 is for connecting the tapping side of the hot water supply circuit 2 to the additional heating circuit 3, and the hot water path 4 is provided with an electromagnetic opening / closing valve (open / close valve) 41. This electromagnetic on-off valve 41 is closed at the time of hot water supply and additional heating,
It is opened at the time of bathing. Therefore, at the time of hot water filling, the water heated by the hot water supply heat exchanger 21 is sent into the bathtub 31 via the hot water filling path 4 and the additional heating circuit 3.

In addition, the refilling circuit 3 side (hereinafter referred to as the refilling circuit 3 in the
The side is called the downstream side, and the hot water supply circuit 2 side is called the upstream side. First)
Second check valves 42 and 43 are provided. This first,
The second check valves 42 and 43 allow the flow of the hot water from the upstream side to the downstream side, but prevent the flow in the reverse direction. Therefore, the hot water in the bathtub 31 does not flow into the hot water supply circuit 2 side. The two check valves 42 and 43 are installed because two check valves must be installed in order to surely prevent the flow from the additional heating circuit 3 to the hot water supply circuit 2. In order to satisfy the demands.

The hot water path 4 is provided with a bypass path 5. The upstream end of the bypass 5
The upstream end of the electromagnetic on-off valve 41 is connected, and the downstream end is connected to the downstream side of the electromagnetic on-off valve 41. This allows
The bypass passage 5 bypasses the electromagnetic on-off valve 41. Moreover, the downstream end of the bypass passage 5 is the first end.
It is connected between the second check valves 42 and 43.

In the bypass passage 5, a blow valve 51 is provided.
Is provided. The blow valve 51 is a type of check valve having a predetermined valve opening pressure, and opens when the pressure on the upstream side exceeds the predetermined pressure, and the flow of hot water (water) from the upstream side to the downstream side. However, the flow from the downstream side to the upstream side is always blocked. The valve opening pressure of the blow valve 51 is set higher than the pressure of the water supplied from the water supply source 23, but lower than the pressure that may damage each part of the hot water supply circuit 2 and the hot water path 4.

In the hot water supply apparatus 1 with additional heating described above, when a high pressure such as a water hammer is generated in the hot water supply circuit 2, the blow valve 51 is opened, and the hot water in the hot water supply circuit 2 flows into the additional heating circuit 3 side. . Therefore, the inside of the hot water supply circuit 2 does not have an abnormally high pressure. Therefore, it is possible to prevent each part of the hot water supply circuit 2 from being damaged. Moreover,
The water that has passed through the blow valve 51 flows into the additional heating circuit 3 and does not leak outside the hot water supply device 1. Therefore, there is no danger of giving unnecessary fear that the hot water supply device 1 is out of order, and each part of the hot water supply device 1 is not corroded. Further, since the blow valve 51 is a type of check valve, the hot water supply circuit 2 and the reheating circuit 3 are connected to the bypass passage 5.
In this case, two check valves, the blow valve 51 and the second check valve 43, are provided in the circuit connected via the valve, thereby satisfying the legal requirements.

The electromagnetic on-off valve 41, the first and second check valves 42 and 43, the bypass passage 5, and the blow valve 51
It is desirable to provide a single casing to form a block. By doing so, it is possible to easily assemble the hot water supply device 1. Hereinafter, such a block body 6 will be described with reference to FIG. The block body 6 is provided with an opening valve 8 and a back pressure valve 9 in addition to the components from the electromagnetic on-off valve 41 to the blow valve 51.

In FIG. 2, reference numeral 61 denotes a casing of the block body 6. The casing 61 is composed of a first casing 61A and a second casing 61B fixed to a lower side of the first casing 61A. A passage 62 forming a part is formed. One end of this passage 62 is
The casing 61A has an opening at the upper end side as an inflow hole 62a, and is connected to the hot water supply circuit 2 side. The other end of the passage 62 opens as an outflow hole 62b in the lower end surface of the second casing 61B, and is connected to the reheating circuit 3 side.

The electromagnetic on-off valve 41 is provided at the upper end of the first casing 61A. Solenoid on-off valve 41
The valve seat 41a is disposed so that the axis is oriented in the vertical direction, and divides the passage 62 into an upstream side and a downstream side.
And the back pressure chamber 41 is provided in the upper part of the inside of the first casing 61A by the valve body 41b.
c is formed. The back pressure chamber 41c is
Communicates with the upstream side of the passage 62 through an orifice 41d formed in the valve body 41b, and a small hole 4 formed in the valve body 41b.
It communicates with the downstream side of the passage 62 via 1e. The orifice 41d has an inner diameter such that a large flow resistance is generated when hot water flows inside the orifice 41d, and is significantly smaller than the small hole 41e. On the other hand, the small hole 41e has its upper end opening opened and closed by a valve shaft 41f. The valve shaft 41f is urged downward by the spring 41g to abut against the upper end surface of the valve body 41b to close the small hole 41d, and when energized to a solenoid (not shown), the magnetic force of the valve shaft 41f resists the urging force of the spring 41g. And moves upward to open the small hole 41d.

In the solenoid on-off valve 41 having the above structure, the inside of the passage 62 upstream of the solenoid valve 41 has a predetermined water pressure (the pressure of water supplied from the water supply source 23).
1b is assumed to be seated on the valve seat 41a. In this state, the back pressure chamber 41c is connected to the passage 6 through the orifice 41d.
Since it communicates with the upstream side of the pressure chamber 2, the inside of the back pressure chamber 41c also has a predetermined water pressure. In addition, the pressure receiving area of the valve element 41b facing the back pressure chamber 41c is larger than the valve element 41b facing the upstream side of the passage 62.
, The valve element 41b maintains the seated state.

When the solenoid is energized while the valve body 41b is seated, the valve shaft 41f moves upward and the small hole 4
Open 1e. Then, the back pressure chamber 41c communicates with the downstream side of the passage 62 via the small hole 41e, and the pressure inside the passage 62 decreases. Therefore, the valve element 41b is lifted upward from the valve seat 41a by the water pressure on the upstream side of the passage 62, and the electromagnetic on-off valve 41 is opened. Therefore, hot water flows in the passage 62 from the upstream side to the downstream side. The back pressure chamber 4
1c communicates with the passage 2 through the orifice 41d. However, since the inner diameter of the orifice 41d is significantly smaller than the inner diameter of the small hole 41e, when the valve is opened, hot water flowing from the orifice 41d into the back pressure chamber 41c causes a back pressure. The pressure inside the pressure chamber 41 c does not become the same as the water pressure on the upstream side of the passage 62.

When the power supply to the solenoid is stopped when the valve body 41b is lifted, the valve shaft 41f moves downward by the urging force of the spring 41g, and closes the small hole 41d. Then, the hot water in the passage 62 flows into the back pressure chamber 41c through the orifice 41d, and the pressure in the back pressure chamber 41c becomes the same as that in the passage 62. As a result, the pressure receiving area is different and the back pressure chamber 41
The force of the pressure in c pushing the valve body 41b downward is greater than the force of the pressure in the passage 62 pushing the valve body 41b upward, and the valve body 41b is seated on the valve seat 41a. Thereby, the electromagnetic on-off valve 41 is closed. Note that once the valve element 41b is seated, the seated state is maintained as described above.

A check valve 42 is provided inside the first casing 61A below the electromagnetic on-off valve 41. The check valve 42 includes a valve seat 42a disposed below and coaxially with the valve seat 41a, and a passage 6 below the valve seat 42a.
The valve body 42b is disposed so as to be movable in the vertical direction within the valve body 2.
And a spring 42c for urging the valve body 42b upward to seat on the valve seat 42a. The urging force of the spring 42c is much smaller than the force of the water pressure upstream of the valve seat 42a pressing the valve body 42b downward. Therefore,
When the electromagnetic on-off valve 41 opens and hot water flows into the passage 62, the check valve 42 opens.

A second check valve 43 is disposed inside the second casing 61b above the outflow hole 62b. Like the first check valve 42, the second check valve 43 includes a valve seat 43a whose axis is directed vertically, a valve body 43b arranged downstream of the valve seat 43a, and A spring 43c is provided for urging the valve body 43b upward to seat on the valve seat 43a, and functions in the same manner as the first check valve 42.

The first casing 61A is provided inside the first casing 61A.
The open valve 8 is provided below the check valve 42.
The opening valve 8 is for opening and closing a drain hole 63 formed downward at the lower end of the first casing 61A. The first check valve 42 is provided at the upper end of the drain hole 63.
And a valve seat 81 formed coaxially with the first valve seat 42a, a valve body 42b and a spring 42c shared with the first check valve 42.

In the opening valve 8, since the valve body 42b is shared with the first check valve 42, when the valve body 42b is lifted from the valve seat 42a, the valve body 42b is seated on the valve seat 81. Therefore, when hot water is flowing in the passage 62, the opening valve 8 does not open, and no hot water flows out of the drain hole 63. On the other hand, when the pressure in the passage 62 becomes extremely low or negative, the spring 42c which opens upward against the force for pressing the valve body 42b downward (the pressure in the passage 62 minus the pressure in the drain hole 63 (atmospheric pressure)). When the urging force overcomes, the valve body 42b is lifted from the valve seat 81 by the urging force of the spring 42c, and the drain hole 63 is opened. Thereby, the hot water in the passage 62 is discharged to the outside from the drain hole 63.

A back pressure valve 9 is provided inside the second casing 61B above the second check valve 43. The back pressure valve 9 has a second check valve 43 in the passage 62.
The valve seat 91 is disposed coaxially with the valve seat 43a and divides the passage 62 into a first check valve 42 side and a second check valve 43 side.
A valve body 92 that opens and closes the passage 62 by sitting and lifting the valve seat 91, and a spring 93 that urges the valve body 92 downward to seat the valve seat 91. . When the valve body 92 is seated, the urging force of the spring 93
The internal hot water is set to be smaller than the force pressing the valve body 92 upward. Therefore, when the electromagnetic on-off valve 41 opens and hot water flows in the passage 62, the back pressure valve 9 opens. On the other hand,
When the pressure in the passage 62 becomes a predetermined pressure lower than the water pressure of the water supply source 23 (hereinafter referred to as a residual pressure), for example, 0.5 kg.
/ Cm ^{2, the} size is set such that the valve body 92 is seated on the valve seat 91. Therefore, the back pressure valve 9 closes when the electromagnetic opening / closing valve 41 is closed and the inside of the passage 62 reaches a predetermined residual pressure, and the inside of the passage 62 between the electromagnetic opening / closing valve 41 and the back pressure valve 9 has a predetermined residual pressure. (Biasing force of spring 93 + atmospheric pressure)
To maintain.

The residual pressure is larger than the urging force of the spring 42c, and is set to a value large enough to open the first check valve 42 and close the open valve 8. . Therefore, once the hot water flows in the passage 62, the first
Unless the pressure inside the passage 62 upstream of the check valve 42 becomes extremely low or negative, the first check valve 42 maintains the open state and the open valve 8 maintains the closed state. .

On the side of the first casing 61A,
The bypass path 5 and the blow valve 51 are provided. That is, a mounting hole 52, a communication hole 53 disposed below the mounting hole 52, and a communication groove 54 for connecting the mounting hole 52 to the communication hole 53 are formed on the outer side surface of the first casing 61 </ b> A. Have been. An inner end of the mounting hole 52 opens into a passage 62 upstream of the valve seat 41a of the electromagnetic on-off valve 41, and an inner end of the communication hole 53 is a first end.
Of the check valve 42 and a valve seat 91 of the back pressure valve 9. Also, the first casing 6
A shielding plate (shielding member) 55 is fixed to the side outer surface of 1A, and the mounting hole 52, the communication hole 53, and the communication groove 54 are sealed from the outside by the shielding plate 55.
As a result, the mounting holes 52,
The communication groove 54, the communication hole 53, and the shielding plate 55 form a communication passage that bypasses the electromagnetic on-off valve 41 and communicates the upstream side and the downstream side of the passage 62, and this communication passage is a bypass passage. 5

A blow valve 51 is mounted in the mounting hole 52. The blow valve 51 includes a valve seat 51a formed at an inner end of the mounting hole 52, and a valve body 51 movably inserted into the mounting hole 52 outside the valve seat 51a.
b, and the valve body 51b is urged inward to provide a valve seat 51a.
The valve opening pressure of the spring 51c is higher than the pressure of the hot water flowing in the passage 62 and lower than the pressure at which the hot water supply heat exchanger 21 and the like are damaged as described above. Is set.

When the block 6 having the above structure is used, the inflow port 62a is connected to the hot water supply circuit 2 side, and the outflow port 62a is connected.
b only needs to be connected to the reheating circuit 3 side.
It is not necessary to assemble the first, first and second check valves 42 and 43 and the blow valve 51 respectively. Therefore, assembling of hot water supply apparatus 1 can be easily performed. Moreover, since there is no need to pipe the bypass path 5 separately from the hot water path 4, assembly can be performed more easily, and
Installation space for piping is not required. Further, since the opening valve 8 is provided, all of the electromagnetic on-off valve 41, the first and second check valves 42 and 43, and the back pressure valve 9 fail in the open state, and the hot water supply circuit is used as in the case of water outage. Even if the pressure on the second side becomes negative, the pressure in the passage 62 decreases due to the valve opening failure, and the drainage hole 63 is opened by the urging force of the spring 42c. It flows to 63 side. Therefore, it is possible to prevent the hot water in the bathtub 31 from flowing into the hot water supply circuit 2 through the passage 62.

The present invention is not limited to the above-described embodiment, and the design can be changed as appropriate. For example, in the above embodiment, the present invention is applied to the hot water supply apparatus 1 in which the heat exchangers 21 and 32 for hot water supply and the additional heating are heated by separate burners 24 and 33, respectively. The present invention may be applied to a one-can, two-circuit water heater that heats two heat exchangers with the same burner.

[0031]

As described above, according to the first aspect of the present invention, since the hot water that has passed through the blow valve is made to flow to the additional heating circuit, the water is discharged to the outside of the hot water supply device. Nothing. Therefore, it is possible to bring about an unnecessary worry that the hot water supply device is broken or to prevent the inside of the device from being corroded by water discharged from the blow valve. According to the second aspect of the invention, an effect is obtained that the assembling of the water heater can be easily performed. According to the third aspect of the present invention, since a pipe as a bypass is unnecessary, it is possible to obtain an effect that it is possible to save labor and to reduce an installation space. According to the invention according to claim 4, the blow valve and the blow valve are connected in the circuit in which the hot water supply circuit and the additional heating circuit are connected via the bypass path, although only one blow valve is provided in the bypass path. Second
There is a legal requirement that two check valves must be installed in the circuit connecting the hot water supply circuit and the reheating circuit with two check valves. The effect of being able to satisfy is obtained. According to the fifth aspect of the present invention, an effect is obtained that the hot water supply device can be more easily assembled.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram showing an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a block body suitable for use in the embodiment shown in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Hot water supply apparatus with additional heating 2 Hot water supply circuit 3 Additional heating circuit 4 Filling line 5 Bypass path 41 Electromagnetic on-off valve (On-off valve) 42 First check valve 43 Second check valve 51 Blow valve 52 Mounting hole 53 Communication Hole 54 communication groove 55 shielding plate (shielding member) 61 casing 62 passage

Claims (5)

[Claims] 1. A hot-water supply device with a hot-water supply, wherein a hot-water path for connecting them is provided between a hot-water supply circuit and a reheating circuit, and the hot-water path is provided with an on-off valve. A bypass path bypassing the on-off valve is provided, and in this bypass path, the flow from the additional heating circuit side to the hot water supply circuit side is always blocked, and the valve is opened when the pressure on the hot water supply circuit side exceeds a predetermined pressure. A hot water supply device with additional heating, comprising a blow valve that allows a flow from the hot water supply circuit side to the additional heating circuit side. 2. A supplementary passage according to claim 1, wherein a passage forming a part of the hot water path is formed in a casing, and the on-off valve, the bypass passage, and the blow valve are provided in the casing. Hot water supply device with heating. 3. A mounting hole communicating with the passage on the hot water supply circuit side from the on-off valve, a communication hole communicating with the passage on the reheating circuit side from the on-off valve, and the mounting on an outer surface of the casing. While forming a communication groove for communicating the hole and the communication hole, a shielding member for shielding the mounting hole, the communication hole and the communication groove is provided, and the mounting hole, the communication hole, the communication groove and the shielding member are used for the mounting hole. The hot water supply with additional heating according to claim 2, wherein a bypass is formed, and the check valve is provided in the mounting hole. 4. A flow from the hot water supply circuit side to the hot water supply circuit side from the open / close valve to the hot water supply path on the hot water supply circuit side, and a flow from the hot water supply circuit side to the hot water supply circuit side is provided. First and second check valves for preventing flow are provided, and the first and second check valves are provided.
The hot water supply device with additional heating according to any one of claims 1 to 3, wherein an end of the bypass passage on the additional heating circuit side is connected between the check valves. 5. The hot water supply device with additional heating according to claim 4, wherein the first and second check valves are provided in the casing.