KR100408760B1 - Water heater - Google Patents

Abstract

The present invention relates to a hot water supply device in which a plurality of hot water heaters are provided in parallel, comprising three small hot water heaters including a heat exchanger, supplying a constant water distributed from a raw water pipe connected to a water source by each heat exchanger, and heated hot water. In the hot water supply system, in which the hot water supply pipes connected to the hot water supply pipes leading to the hot water supply place, it is necessary to appropriately increase or decrease the number of hot water heaters used to perform a small amount of hot water supply. As a result, the cost is high because the operation of each hot water heater is controlled as a result.

A pressure opening and closing valve is provided in the water supply pipe of the water heater, and the pressure opening and closing valve is opened when a predetermined pressure difference occurs between the water supply pressure in the original water supply pipe and the combined hot water supply pipe that increases or decreases in response to the amount of water supply to each hot water supply place.

Therefore, it is possible to reduce the cost of the hot water supply device without requiring a separate power source and a detection means to efficiently increase or decrease the number of hot water heaters in sequential operation according to the amount of hot water to each hot water place. When the device is installed, a pressure opening and closing valve may be provided in the water supply pipe, so that the installation work is easier than in the conventional hot water supply device for wiring.

Description

Hot water heater {Water heater}

The present invention relates to a hot water supply device in which a plurality of hot water heaters are provided together.

When a hot water supply machine is used for a facility that needs to provide adequate hot water supply to a large number of places such as a hotel and a general hospital, the hot water supply capacity of the hot water supply machine is designed in consideration of the case where it is used simultaneously in all hot water supply places.

In this case, a large hot water heater may be newly designed and manufactured, but the minimum amount of operating water that does not overheat the heat exchanger in the minimum heating amount becomes large and cannot be used when the hot water supply amount is small.

Therefore, it is proposed to provide several general-purpose small water heaters as a hot water supply device.

The hot water supply device is connected to a water supply pipe for supplying constant water dispersed in a raw water supply pipe connected to a water source by a heat exchanger of each hot water heater, and a hot water supply pipe for joining a hot water supply pipe for guiding the heated hot water to a hot water supply place.

In this case, when all the hot water heaters constituting the hot water heater are inexpensive to operate when the amount of hot water in the hot water supply area is small, the total number of the minimum operating quantities of all the hot water heaters is required to operate all the hot water heaters constituting the hot water heater, Since a small amount of hot water cannot be supplied, the hot water supply device appropriately increases or decreases the number of hot water heaters used in response to the amount of hot water to each hot water place.

That is, in the conventional hot water supply apparatus, the flow sensor and the hot water heater located on the upstream side of the original water supply pipe are removed from the original water supply pipe, and the water supply electromagnetic opening and closing valve is provided in the water supply pipe of each water heater.

The number of hot water heaters used is increased by detecting the quantity of water in the original water supply pipe which changes in response to the increase or decrease of the amount of hot water supplied to each hot water place by the flow sensor, and opening and closing the water supply electromagnetic opening and closing valve of each hot water heater in response to the detection result. (See, for example, Japanese Patent Application Laid-Open No. 4-1171)

However, in the above description, a power supply for the water supply solenoid valve is required separately, and since a detection means such as a flow sensor and a control program are required to control the opening and closing of the water supply solenoid valve, the problem of incurring high cost of the hot water supply device. There was.

In addition, since the wiring work for the water supply solenoid valve is required separately during the installation of the hot water supply device, the installation work becomes inconvenient.

Accordingly, the hot water supply device of the present invention has been made in view of the above-mentioned problems, and it is easy to install, without requiring a separate detection means and control program, which incurs a high cost in efficiently increasing and decreasing the number of hot water heaters used in response to the amount of hot water. An object of the present invention is to provide a hot water supply device.

1 is a front view of the hot water supply apparatus of the present invention,

Figure 2 is a cross-sectional view showing a pressure opening and closing valve in the hot water supply apparatus of the present invention,

Figure 3 is a graph showing the relationship between the amount of water and the pressure difference in the water supply pipe of each water heater accompanying the operation of the pressure opening and closing valve in the hot water supply apparatus of the present invention.

<Description of Signs of Major Parts of Drawings>

One ; Hot water supply apparatus 10a, 10b, 10c; Water heater

12; Heat exchanger 15; feed pipe

16; Tapping pipe 2; Circle water pipe

3; Hot water place 4; Confluence

6b, 6c; Pressure Relief Valve

The hot water supply device of the present invention for achieving the above object is provided with at least two hot water heaters provided with a heat exchanger, supplying a constant water dispersed in the original water supply pipe connected to the water source by the heat exchanger of each hot water heater, and hot water hot water place In the hot water supply apparatus which connected the tapping pipes joined to the tapping pipe which guide | induced until each other, WHEREIN: The predetermined pressure between the water pressure in a raw water supply pipe, and the water pressure in the tapping water pipe which increases or decreases according to the amount of hot water supply to each hot water supply place. When the difference occurs, the pressure opening and closing valve is opened in the water supply pipe of at least one water heater.

According to the present invention, when the hot water coke is further opened while the hot water is being heated by the hot water supply device constituting the hot water supply device to increase the amount of hot water, the water pressure in the confluence hot water pipe is lowered. When a predetermined pressure difference is generated between the on-off valve and the water pressure in the raw water supply pipe acting on the upstream side, the pressure-opening valve opens.

When the pressure-opening valve is opened, a constant flows into the waterways in the other hot water heaters, and the hot water heaters are in a hot water supply state, thereby increasing the amount of hot water to the hot water supply place.

When each hot water heater constituting the hot water supply device on the other side is in hot water condition, when the water cock is closed in the hot water supply area sequentially, the quantity of water in the confluence hot water pipe is reduced, and the water pressure in the confluence hot water pipe increases, and the upstream pressure of the condensed hot water pipe increases. When there is no predetermined pressure difference between the water pressure in the original water supply pipe acting on the side, the pressure opening / closing valve is closed, and the hot water supply of the water heater is stopped.

This effectively increases or decreases the number of hot water heaters used in response to the hot water supply amount.

Here, the pressure opening and closing valve forms a valve body having an upstream passage and a downstream passage, and when the pressure difference occurs, the pressure release valve has a biasing force that allows movement in a direction of separating from the valve seat formed at the end of the upstream passage. The upstream passage and the downstream passage may be distinguished by a diaphragm that is urged to bind the valve seat.

However, when two or more pressure switch valves are opened in the water supply pipe of each water heater, it is necessary to change the opening timing of the pressure switch valves in order to increase or decrease the number of water heaters to be used appropriately in response to the amount of water supply to the hot water supply place.

In this case, the biasing means is provided with a biasing force control means for adjusting the biasing force, when two or more pressure opening and closing valves in the water supply pipe of each water heater, if the pressure of each pressure opening and closing valve different from each other sequentially The valve can be opened.

In addition, by periodically changing the setting of the spring force of each of the pressure switching valves, the pressure opening and closing valves can be changed in sequence depending on the amount of water supply to the hot water supplying place. Can be made uniform.

In this case, it is advantageous to open a pressure shut-off valve in the water supply pipes of all the water heaters constituting the hot water supply device.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a front view of the hot water supply device of the present invention, (1) shows a hot water supply device for the facility that needs to be appropriately applied to a number of places, such as a hotel and a general hospital, the hot water supply device (1) is a 20 The branch has three general-purpose water heaters 10a, 10b, and 10c in parallel.

Each of the first, second and third hot water heaters 10a, 10b and 10c includes a burner part 11 serving as a heating device, a heat exchanger 12 provided on the burner part 11, and a burner part. The combustion fan 13 which is located in the lower part of 11 and supplies combustion air to the burner part 11 is attached to the box-shaped body 14, and is comprised.

First, second, and second supplying constants distributed in a raw water supply pipe 2 connected to a water source (not shown) to the heat exchanger 12 of each hot water heater 10a, 10b, 10c, and the like. The first, second and third tapping pipes each of which is joined to each of the third water supply pipes 15a, 15b and 15c and the combined tapping water pipe 4 which guides the heated hot water to the hot water supply point 3 ( 16a, 16b, 16c are connected.

Moreover, the flow rate sensor 17 is provided in each water supply pipe 15a, 15b, and 15c, and the tapping temperature sensor 18 is provided in each tapping pipe 16a, 16b, 16c.

The burner part 11 accommodated in the burner case the some Bunsen type burner in which several craters were continuously installed in the upper surface.

The burner section 11 is connected to a fuel gas supply pipe 5 connected to a gas source via a gas valve 50 and a proportional control valve 51.

The operation of the burner part 11 is controlled by the control means (not shown) provided in each hot water heater 10a, 10b, 10c.

The control means is that the water cock is opened for the hot water supply in the hot water supply place 3, and passes through the heat exchanger 12 from the water supply pipes 15a, 15b, and 15c to the hot water supply pipes 16a, 16b, and 16c. When the flow rate sensor 17 detects that a constant flows in the water supply channel inside the hot water heater and reaches a predetermined value, the burner unit 11 is ignited, thereby providing the hot water heaters 10a, 10b, and 10c. ) Becomes hot water supply state.

In response to the signal from the tapping temperature sensor 18, the proportional control valve 51 is controlled to adjust the amount of fuel gas supplied to the burner unit 11 to control the hot water temperature to the set temperature.

Moreover, the minimum operating water quantity of each hot water heater 10a, 10b, 10c by which fuel gas is supplied and combustion of the burner part 11 is started is set to 2.7 L / min.

In the case where the hot water supply apparatus 1 is configured as described above, it is necessary to increase or decrease the number of the hot water heaters 10a, 10b and 10c used in response to the amount of hot water to each hot water supply place 3.

In this embodiment, when a predetermined pressure difference occurs between the water pressure in the raw water supply pipe 2 and the water pressure inside the hot water supply pipe connected to the confluence hot water supply pipe 4 which increases or decreases in response to the amount of hot water to each hot water supply place 3, the opening is performed. The 1st and 2nd pressure opening and closing valve 6b and 6c of the same structure were opened in the 2nd and 3rd water supply pipe 15b and 15c.

Referring to Fig. 2, the valve body 60 of the pressure opening and closing valves 6b and 6c has an upstream passage 61 which forms a connection portion 61a and 62a which can be fastened to each of the water supply pipes 15b and 15c, respectively. The downstream passage 62 is established.

The upstream passage 61 is formed in an L shape, and a valve seat 61b is formed at the end portion thereof.

The upstream passage 61 and the downstream passage 62 are divided into diaphragms 63 provided to be attached to the valve seat 61b.

The diaphragm 63 is biased in the valve seat 61b direction by a spring 64 having a biasing force that allows movement in the direction of separation from the valve seat 61b when the pressure difference occurs.

The spring 64 has a diaphragm and a cross section of the adjustment rod 66, which is a force adjustment means inserted through the seal member 66a in the spring receiving portion 65 formed in the valve body 60, facing the valve seat 61b. It is provided between 63.

A venturi portion 67 is formed in the downstream passage 62, which communicates with the spring receiving portion 65 through the bypass passage 68 to control the movement of the diaphragm 63. .

When the pressure difference between the upstream passage 61 and the downstream passage 62 reaches a predetermined value, and the diaphragm 63 is slightly separated from the valve seat 61b against the spring 64, the upstream passage 61 and the downstream passage Reference numeral 62 communicates.

In this case, the pressure opening and closing valve 6 is an upstream side of the diaphragm 63 because the negative pressure generated by the venturi effect in the venturi portion 67 is transmitted to the spring receiving portion 65 through the bypass passage 68. It develops instantaneously with a constant water pressure acting on.

Here, in order to bring the hot water heaters 10b and 10c into the hot water supply state in response to the amount of hot water to the hot water supply place 3, it is necessary to change the timing at which the pressure opening and closing valves 6 are opened.

In this embodiment, the recess 66b is formed at three positions of the adjustment rod 66 so that the bias force of the spring 64 can be adjusted step by step by changing the spring compression ratio during the compression installation of the spring 64. At the same time, a stopper 69 is mounted on the outer wall of the spring accommodating part 65 in the vertical direction with respect to the adjusting rod 66.

Then, by placing the stopper 69 somewhere in the recess 66b and adjusting the insertion amount of the adjustment rod 66 into the spring accommodating portion 65, the force of the spring 64 in three stages can be set.

However, in the hot water supply state of only the first hot water heater 10a, for example, when the second pressure open / close valve 6b is opened and closed, the constant that flows from the original water supply pipe 2 to only the first water supply pipe 15a is the second hot water heater 10b. ), The water pressure inside the first water supply pipe 15a drops excessively.

When the hot water joins the confluence tapping tube 4 via the second tapping tube 16b on the other side, the hot water joining becomes excessively resistant to the hot water in the first tapping tube 16a, and the water channel inside the water heater 10a. Lowers the flow rate inside.

As a result, the amount of water in the first water supply pipe 15a may be equal to or less than the minimum operating water amount, and the control means may stop the operation of the burner part 11 and the hot water supply by the first water heater 10a may be stopped.

Therefore, in the case of determining the opening timing of the pressure opening and closing valve 6b, after the pressure opening and closing valve 6b is opened, the quantity of water in the first water supply pipe 15a does not become below the minimum operating water amount, that is, in the second tapping pipe 16b. It is necessary to set the force of the spring 64 and the formation position of the recessed portion 66b of the adjusting rod 66 so that the pressure opening and closing valve 6b is opened as little as possible to become hot water joined to the confluence tapping pipe 4. There is.

In this embodiment, when the said pressure difference becomes 20 Kpa in the return position of the adjustment rod 66 (the main part of the rightmost side in FIG. 2), 25 Kpa in the intermediate position, and 30 Kpa in the press-in position, the diaphragm 63 will valve The auxiliary force of the spring 64 and the formation position of the recessed part 66b of the adjustment rod 66 were set so that it may separate and open | separate from the sheet 62b.

Next, operation | movement of the hot water supply apparatus 1 of this embodiment is demonstrated.

Here, the adjustment rod 66 of the 1st pressure switching valve 6b was set in the intermediate position, and the 2nd pressure opening and closing valve 6c was set in the pushing-in position.

When a water cock is opened in the hot water supply place 3, a constant flows to the 1st hot water supply pipe 15a first.

When the flow rate sensor 17 detects that the constant water quantity has reached the minimum operating water amount (2.7 L / min), the control means opens the gas valve 50 to start supplying fuel gas, and at the same time, performs ignition operation to burn the burner part. (11) is operated and the 1st hot water heater 10a becomes a hot water supply state.

In this case, the same water pressure as the water pressure inside the first hot water supply pipe 15a acts on the upstream passage 61 of the first and second positive pressure opening and closing valves 6b and 6c.

Next, when the water supply is increased by opening the water cock in the plurality of hot water supply places 3, the water pressure inside the confluence hot water pipe 4 decreases.

In this case, the water pressure inside the second and third water heaters 10b and 10c decreases.

Accompanying this, the water pressure in the downstream passage 62 and the spring chamber 65 of the pressure release valve 6b, 6c falls.

When the pressure difference between the pressure inside the spring chamber 65 and the hydraulic pressure acting on the upstream passage 61 reaches 25 Kpa, the pressure opening / closing valve of the second water supply pipe 15b against the bias force of the spring 64 ( 6b) opens.

In this case, the pressure shut-off valve 6b is upstream of the diaphragm 63 by the negative pressure generated by the venturi effect in the venturi part 67 being transmitted to the spring accommodation chamber 65 through the bypass passage 68. It develops instantaneously with constant water pressure acting on the side.

When a constant flows inside the hot water heater 10b, and the quantity exceeds the minimum operating water amount, the burner unit 11 operates in the same manner as described above, and the hot water heater 10b becomes a hot water supply state. The hot water supply operation state by the large hot water heaters 10a and 10b is obtained.

Next, the water cock is further opened at the plurality of hot water supply places 3 to increase the hot water supply amount, the water pressure inside the third hot water heater 10c decreases, and the pressure inside the spring chamber 65 of the pressure opening and closing valve 6c is increased. When the pressure difference between the hydraulic pressure acting on the upstream passage 61 reaches 30 Kpa, the pressure opening and closing valve 6c of the third water supply pipe 15c opens against the side force of the spring 64 in the above-described form. .

If a constant flows inside the hot water heater 10c, and the quantity exceeds the minimum operating water amount, the burner unit 11 operates in the same manner as described above, and the hot water heater 10c is brought into a hot water supply state.

As a result, the hot water supply device 1 is brought into a hot water supply operation state by three hot water heaters 10a, 10b and 10c.

Here, FIG. 3 shows the relationship between the water pressure of the constant and the water quantity in the water supply pipes 15a, 15b and 15c of each hot water supply device 1.

The solid line T shows the quantity of water inside the confluence hot water pipe 4, and the solid lines # 1, # 2, and # 3 show the water supply pipe 15 of each hot water heater 10a, 10b, 10c for water pressure. Each quantity in the figure is shown.

According to this, when the pressure difference between the water pressure in the upstream passage 61 and the water pressure in the downstream passage 62 that increases in response to the increase in the amount of hot water becomes about 25 Kpa, the first pressure is opposed to the force of the spring 64. The on-off valve 6b opens.

In this case, the water pressure inside the water supply pipe 15a of the first hot water heater 10a is excessively reduced, and the amount of water is lowered because the hot water is joined to the confluence hot water pipe 4 by the second hot water heater 10b. It did not fall to the water yield (2.7 L / min or less) which the burner part 11 of the water heater 10a of 1 was extinguished.

And the water pressure in the 1st and 2nd water supply pipe 15a, 15b became gradually the same.

Next, the amount of hot water supply was further increased, and when the pressure difference became about 30 Kpa, the second pressure opening and closing valve 6c was opened.

In this case, the water pressure inside the water supply pipes 15a and 15b is excessively lowered and the water supply is joined to the confluence hot water pipe 4 by the third hot water heater 10c so that the first and second water supply pipes 15a ( 15b) Although the internal water quantity fell, it did not fall to the water volume (2.7 L / min) which the burner part 11 of the 1st and 2nd water heater 10a, 10b digested.

Finally, when the water cock is sequentially closed at the hot water supply place 3, the water pressure is increased by decreasing the amount of water in the confluence hot water pipe 4, and the water pressure inside the hot water heaters 10b and 10c increases.

When the pressure difference is 30 Kpa or less, the diaphragm 63 is moved in the valve seat direction 62b by the force of the spring 64, and the pressure opening and closing valve 6c opens.

In this case, the third hot water heater 10c is in a state in which water does not circulate, the burner part 11 is extinguished to stop the hot water supply, and the hot water supply device 1 is hot water supply by two hot water heaters 10a and 10b. Return to operation.

Next, when the water cock is further closed in the hot water supply place 3, the water pressure in the water channel inside the hot water heater 10b increases, and when the pressure difference becomes 25 Kpa or less, the diaphragm 63 is opened by the bias force of the spring 64. It moves to the seat direction 62b, and the pressure opening and closing valve 6b is closed.

In this case, the second hot water heater 10b is in a state in which water does not circulate, and the burner part 11 is extinguished to enter a hot water stop state.

As a result, the hot water supply device 1 returns to the hot water supply operation state only by the first hot water heater 10a.

In addition, in the hot water supply apparatus 1 of this embodiment, although the pressure opening / closing valve was not provided in the 1st hot water heater 10a, you may establish a pressure opening and closing valve in all hot water heaters 10a, 10b, 10c.

In this case, the life of each hot water heater is changed by manually changing the insertion amount of the adjustment rod 66 of each pressure switching valve 6 manually and changing the order of the hot water heaters 10a, 10b, 10c, which are brought into the hot water supply state. The internalization of the hot water supply device 1 can be further improved.

In addition, in this embodiment, the adjustment rod 66 was operated manually to change the subordinate force of the spring 64, but it can be comprised so that a subordinate force may change automatically.

Accordingly, the present invention can reduce the cost of the hot water supply device without requiring a separate power supply and a detection means to efficiently increase or decrease the number of hot water heaters which have been sequentially operated in response to the amount of hot water to each hot water place.

In addition, when the hot water supply device is installed, the pressure opening and closing valve may be provided in the water supply pipe, so that the installation work is easier than in the conventional hot water supply device for wiring.

Claims (3)

At least two hot water heaters equipped with a heat exchanger are installed, and a tapping pipe joined with a hot water pipe for supplying constant water dispersed in a raw water pipe connected to a water source with a heat exchanger of each hot water heater, and a confluence hot water pipe for guiding the heated hot water to a hot water place. In the hot water supply system A pressure-opening valve is opened in the water supply pipe of at least one water heater to open when a predetermined pressure difference occurs between the water pressure in the original water supply pipe and the water pressure in the confluence tapping pipe which increases or decreases depending on the amount of water supply to each hot water place. Hot water device made with. The pressure release valve of claim 1, wherein the pressure-opening valve forms a valve body having an upstream passage and a downstream passage, and when the pressure difference occurs, a biasing force allowing movement in a direction of separation from the valve seat formed at the end of the flow passage. Hot water supply device characterized in that the diaphragm is urged to bind to the valve seat by the urging means having an upstream passage and the downstream passage. According to claim 2, wherein the biasing means is provided with a biasing force adjusting means for adjusting the biasing force, when the two or more pressure opening and closing valves in the water supply pipe of each water heater, the pressure of the respective pressure opening and closing valves are different. Hot water device made with.