JPS642859B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a water heater that distributes and supplies hot water from a water heater to a plurality of water discharging appliances.

[Prior art]

BACKGROUND ART Conventionally, a hot water supply system that uses a gas instantaneous water heater or the like as a hot water source and can supply hot water to a plurality of water discharging appliances such as a hot water mixer faucet in a washbasin or a shower device in a bathroom has been installed in general houses.

FIG. 1 is a hot water supply system diagram showing a simple example of a hot water supply system. 1 is a water heater that connects a water supply pipe 2 and a hot water supply pipe 3, and a branch pipe 4 from the hot water supply pipe 3 is connected to the first and second water discharging appliances A ₁ and A ₂ , and the hot water supply pipe 3 is connected to the most downstream water supply pipe 3. 3 Connected to water discharging equipment A ₃ .
Here, it is assumed that the first, second, and third water discharging appliances A ₁ , A ₂ , and A ₃ are arranged at the same level, and the flow path resistance of the flow path formed inside them is also different. . Among them, since the first water discharging device _A1 is a shower device, the flow path resistance is the largest.

Now, when the hot water valve of the first water discharging appliance A ₁ , which has a large flow path resistance, is fully opened and the maximum amount of hot water Q ₀ is being supplied from the water heater 1, the flow path resistance is extremely large compared to the first water discharging appliance A ₁ . Let's consider the change in the flow system when the hot water valve of the small second water discharging appliance _A2 is opened.

When water heater 1 is an instantaneous gas water heater, its rated output is determined, and the maximum discharge amount is as described above.
Q becomes ₀ . Here, if we ignore the pipe resistance of the water supply pipe 3 (in this case, the pipe resistance between the second water discharging fixture A ₂ and the first water discharging fixture A ₁ ), these water discharging fixtures A ₁ , A ₂ will not react to the hot water. Only the channel resistance in the internal flow acts. As mentioned above, since the flow path resistance of the second water discharging device A ₂ is smaller than that of the first water discharging device A ₁ , it becomes easier for the second water discharging device A to flow in _{the two} directions (the flow rate is Q ₁
), the flow rate from the first water discharging fixture A ₁ is (Q ₀ - Q ₁ ), and the flow rate decreases from the initial usage state, and there are cases where the flow rate relationship becomes Q ₁ > Q ₀ - _{Q 1} . , the amount of hot water from the first water discharging appliance _A1 may decrease significantly.

Therefore, while the amount of water discharged fluctuates, since the amount of water supplied is constant, the temperature also decreases, causing inconvenience during use.

In this way, when multiple water discharging appliances are arranged at the same level, when the hot water valve of another appliance is opened while water is being spouted from any appliance, the amount of hot water is distributed according to the flow path resistance of each discharging appliance. When the valve of a water discharging device is opened for the first time, the flow rate and temperature will fluctuate and decrease.

Figure 2 also shows water discharging equipment on the first and second floors of the building.
This is a system in which A ₄ and A ₅ are arranged, and hot water can be supplied to each from the water heater 1. In this case, since there is a difference in position between the two water discharging appliances A ₄ and A ₅ , the flow rate characteristics of hot water from both the appliances A ₄ and A ₅ are as shown in FIG. 3.

From this flow rate characteristic, if the hot water supply pressure ignores the pipe resistance, it is impossible to discharge water from the upper water discharging device _A4 unless the hot water supply pressure exceeds the pressure P ₀ corresponding to the position head difference, and this hot water supply pressure P ₀ or less If both hot water valves are opened at this time, air may be sucked from the water discharging device _A4 .

In this way, in conventional water heating systems, the discharge amount from multiple water discharging appliances placed at the same level fluctuates based on the internal flow path resistance of each discharging appliance itself, and there is a difference in the position of the heads placed on the upper and lower floors. Sometimes there is a problem that it is not possible to supply hot water to upper and lower floors at the same time.

[Technical problem of the invention]

The technical problem to be solved by the present invention is that when hot water is supplied from a water heater to a plurality of water discharging devices, the amount of hot water can be increased when the water discharging devices are used simultaneously, regardless of the internal flow path resistance and positional head difference of the water discharging devices. To enable hot water to be supplied to each water discharging device without drastic changes in water.

[Structure of the invention]

The configuration of the present invention for achieving the above-mentioned technical problem is such that, in a water heater configured to distribute hot water from a single hot water source to a plurality of water spouting devices via branch piping, a first water spout of the water spouting devices is provided. The sum of the position head of the device and the fluid loss head occurring in the flow path up to the discharge end, plus the sum of the position head of the second water discharging device and the fluid loss head occurring in the flow path system up to its discharge end. A resistance portion is provided in the flow path system of the water discharging device to increase the fluid loss head so that the fluid loss head is approximately equal.

With the above configuration, the present invention is capable of making the flow conditions of a plurality of water discharging devices substantially the same.

〔Effect of the invention〕

The present invention achieves the following effects with the above configuration.

When discharging hot water from another water dispensing device while hot water is being supplied from one dispensing device, the flow conditions to each dispensing device are constant, so the flow rate is evenly distributed to each device, and simultaneous use is possible. It is possible to reduce the increase and decrease in the amount of hot water from the water discharging equipment, and to reduce the temperature fluctuations of the mixed water.

Since the flow conditions to each water discharging device can be made constant regardless of the position of the water discharging device, the hot water supply equipment on the upper and lower floors can be used at the same time.

〔Example〕

The present invention will be described below based on embodiments shown in the drawings.

Figure 4 shows a hot water supply system in which the present invention is applied to the conventional system shown in Figure 1.
A resistance portion R ₁ is provided in the branch pipe 4 leading to the second water discharging device A ₂ having the smallest internal flow path resistance among the second and third water discharging devices A ₁ , A ₂ , and A ₃ .

Here, assuming that the losses in the pipes are ignored and the water discharging devices are at the same level, that is, there is no difference in position head, the loss head based on the flow path resistance in the internal flow in the first and second water discharging devices A ₁ and A ₂ is calculated. If h ₁ , h ₂ (h ₂ < h ₁ ), then the loss head based on the flow path resistance of the resistance part R ₁ is
The structure of the resistor portion R ₁ is selected so that h ₀ is about h ₀ ≒ h ₁ − h ₂ . That is, the loss head based on the flow path resistance up to the outflow end of the flow path system to the second water discharging device _A2 is made approximately the same as that of the first water discharging device _A1 , and the difference in pressure loss head in the internal flow is made zero. to do,
Various structures can be applied to the resistance part _R1 depending on the flow rate of hot water and other various conditions.

FIG. 5 is a cross-sectional view showing an example of the resistance part _R1 , in which a partition wall 12 with a through hole 11 is provided in the main body 10, and a resistance valve 13 that approaches and separates from the valve seat 12a is provided on the partition wall 12. It consists of Reference numeral 14 denotes a lid body that is removably screwed onto the main body 10, and has a valve shaft 15 slidably attached to the lower part thereof and a spring 16 that biases the valve shaft 15 toward the valve seat 12a below. There is. 17 is a packing attached to the lower end of the valve shaft 15. This resistance part R ₁ has a structure similar to that of a normally used check valve, but the elastic force of the spring 16 is larger than that of a check valve, and the elastic force of the spring 16 is larger than that of a check valve. When hot water flows down, the spring 16 is activated by hot water supply pressure and flow pressure.
is compressed and the resistance valve 13 opens.

By setting the loss head based on the flow path resistance due to the resistance valve 13 and the bending of the flow path to the above-mentioned h ₀ , the first, second, and water discharging appliances A ₁ , A ₂
The loss head difference in the internal flow can be made zero.

FIG. 6 is a cross-sectional view of the resistance part _R1 showing another example.
This example is for use in cold regions where water can be easily drained from the channel system to prevent freezing.

The valve stem 15 has a bush 20 fixed to the main body 10.
It is rotatably screwed onto a spindle 22 and has a handle 21 attached to its upper end so as to be slidable up and down. The valve shaft 15 has a vertical hole 2 of the spindle 22.
A step portion 15a is formed at a portion located within the spindle 22, and an engagement ring 24 is attached to the spindle 22, which can abut and engage with the step portion 15a from below. In Fig. 6, the seal 17 is seated on the valve seat 12a, but when hot water is flowing, the spring 16 is compressed by the hot water supply pressure and the flow pressure, and the valve opens, creating resistance in the flow path as in the previous example. Can be added. Further, when the handle 21 is rotated, the spindle 22 moves upward, and the stepped portion 15a of the valve shaft 15 engages with the engagement ring 24 and rises without rotation, opening the resistance valve 13. Let me speak. This allows the water in the flow path to be discharged and prevents freezing in cold regions.

Such a resistance part R ₁ is provided in the flow path to the second water discharging device A ₂ whose internal flow path resistance is smaller than that of the first water discharging device A ₁ , and the loss head due to the resistance portion R ₁ is By making the loss head difference based on the internal flow path resistance of each of the two water discharging devices A ₁ and A ₂ approximately equal, the flow path resistance of the second water discharging device A ₂ is substantially equal to that of the first water discharging device A ₁ . It can be made almost equivalent.

Therefore, even if the valve of the second water discharging device A ₂ is opened while the first water discharging device A ₁ is in use, the flow conditions in the independent flow path system of both devices A ₁ and A ₂ will be changed due to the installation of the resistance part R ₁ . are the same, the same amount of hot water is supplied from both appliances A ₁ and A ₂ , and as in the conventional example, the first water discharging appliance
The flow rate and temperature of water discharged from A ₁ will not decrease drastically.

In addition, in this example, it is possible to provide the resistance section R ₁ in the flow path system to the third water discharging device A ₃ , and in this case as well, it is possible to provide the resistance section R 1 in the flow path system to the third water discharging device A 3 . The loss head difference with the first water discharging appliance A ₁ ) may be set to zero.

Note that the resistor part _R1 is not limited to the structure described above.
For example, a bushing or the like that can function as an orifice to restrict the flow path may be provided.

FIG. 7 shows an example in which the present invention is applied to a hot water supply system in which a plurality of first to fifth water discharging appliances A ₁ to A ₅ are arranged on the upper and lower floors of a two-story building.

If the position head due to the difference in the installation height of the first to fifth water discharging appliances A ₁ to _{A 5} on the upper and lower floors is H, then hot water will be distributed to the first to fifth water discharging appliances A ₁ to A ₅ on the upper and lower floors. In order to do this, if a resistor _R2 that functions as a loss head corresponding to this position head H is provided in the hot water supply pipe 3 on the downstairs side, the flow characteristics of the appliances on the upper and lower floors shown in Fig. 3 will be approximately the same. be able to. Furthermore, the resistance part
The structure of R ₂ is almost the same as the above resistance part R ₁ , and the resistance part R ₁
The elastic force of the spring 16 is greater than in the case of .

Therefore, the water discharge start pressure of each of the water discharging appliances A ₁ to _{A 5} on the upper and lower floors can be set to the hot water supply pressure corresponding to the position head H. For example, while operating the fourth water discharging appliance A ₄ on the floor, Even if the hot water valve of the second water discharging appliance _A2 is opened, the flow conditions to the downstairs side are the same as those to the upstairs side due to the provision of the resistance part _R2 , so the second water discharging appliance
The amount of hot water from A ₂ will not decrease drastically.

FIG. 8 shows another example of the resistance section _R2 used for a two-story building, which has two through holes 1 in the partition wall 12.
1a, 11b are formed, and each through hole 11a, 11
(b) A resistance valve 13 and a drain valve 30 whose upper surfaces serve as valve seats 12a and 12b.

The structure of the resistance valve 13 is almost the same as that shown in FIG. 5, and the drain valve 30 has a seal 17 attached to the lower end of a spindle 22 rotatably mounted on the main body 10, and a handle 21 is provided at the upper end. It has the same structure as a normal water stop valve. Resistor section with this configuration
At _R2 , the resistance valve 13 acts to reduce the hot water supply pressure, and the drain valve 30 is used to discharge water in the flow path, thereby preventing freezing. Furthermore, by opening the drain valve and changing its opening degree, the pressure loss head uniquely determined by the resistance valve 13 can be adjusted to reduce, making it easy to adjust even if the installation level of water discharging equipment between the upper and lower floors changes depending on the building. It is possible to correspond to

In addition, the resistor parts R ₁ and R ₂ may be used together.
For example, as shown in FIG. 9, in a hot water supply system in which a plurality of first to fifth water discharging appliances A ₁ to _{A 5} are arranged in the upper and lower floors of a two-story building, the resistance part R ₁ shown in FIG. To solve the inconvenience that occurs when using the water discharging equipment on the upper _and lower floors _at the same time, or when the water discharging equipment only on the upper floor or only on the downstairs is used at the same time. You can also do it.

[Brief explanation of drawings]

Figure 1 is a system diagram showing an example of a conventional hot water supply system, Figure 2 is a system diagram showing a simple example of installing a hot water system on the first and second floors of a building, and Figure 3 is a system diagram showing an example of a conventional hot water supply system.
Figure 4 is a system diagram showing the conventional hot water supply system shown in Figure 1 to which the present invention has been applied; Figures 5 and 6 are FIG. 7 is a system diagram showing the application of the present invention to a hot water supply system installed upstairs and downstairs, and FIG. 8 is a cross-sectional view showing an example of the configuration of a resistance section. FIG. 9 is a sectional view showing a configuration example, and FIG. 9 is a diagram of a hot water supply system showing another example. 1... Water heater (hot water source), 2... Water supply pipe, 3...
…Hot water pipe, 4…Branch pipe, _A1 to _A5 …Water discharge equipment,
R...Resistance part.

Claims (1)

[Claims] 1. In a hot water supply system configured with a system that distributes hot water from a single hot water source to multiple water discharging appliances, the amount of fluid generated between the position head of the first discharging appliance and the discharge end of the discharging appliances in the same system. A resistance section is provided in the flow path system of the second water discharging device so that the sum of the position head of the second water discharging device and the loss head of the fluid occurring within the flow path system is approximately equal to the sum of the loss head of the second water discharging device. A water heater characterized by being provided with.