JP2003148810A - Instantaneous water heater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an instantaneous water heater free from the pressure in a hot water supply pipe caused when a heat source in a storage tank is operated and the water in the storage tank is expanded. SOLUTION: When the heat source 4 of the instantaneous water heater 14 mounted between the central heat source 1 and an end stop system cock 2 is operated, a temperature of the water stored in the storage tank 5 is raised, its volume is expanded, and the pressure in the storage tank 5 is raised. Here, as a check valve 7 is mounted on an inlet connection port 8, the raised pressure is prevented from being transferred to the hot water supply pipe 3. Whereby the instantaneous water heater 14 is installed without considering the withstand pressure performance of the hot water supply pipe 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is attached to a hot water supply pipe between a central heat source such as a gas water heater, an oil water heater, an electric water heater, etc. and a front stop type faucet of a hot water supply terminal, and a hot water storage tank, The present invention relates to an instant hot water supply device including a heat source for heating water in a hot water storage tank.

[0002]

2. Description of the Related Art Conventionally, when a central heat source is used, hot water supply pipes are connected from one heat source to several hot water supply terminals. The accumulated hot water has cooled, and it has been inconvenient that it takes time for hot water of a predetermined temperature to come out when hot water is used. To solve this,
For example, in Japanese Utility Model Laid-Open No. 49-15562, as shown in FIG. 3, a heat source 4 is provided between a central heat source 1 and a stopper type faucet 2.
A hot water storage tank 5 provided with is installed so that cold water in the hot water supply pipe 3 and hot water in the hot water storage tank 5 are mixed and allowed to flow out from the front stop type faucet 2. Immediate water heater 6 having such a configuration
Thereby, the cold water does not come out directly from the front stop type faucet 2, and even in the front stop type faucet 2 far from the central heat source 1, the waiting time until the hot water of a predetermined temperature comes out can be shortened.

[0003]

However, in the instant hot water supply device 6 having the above-described configuration, the heat source 4 in the hot water storage tank 5 is used.
Is activated, the water in the hot water storage tank 5 expands,
High pressure is applied to the hot water storage tank 5 and the hot water supply pipe 3. In order to deal with this, it is easy to give the hot water storage tank 5 of the instant hot water supply device 6 a high pressure resistance performance, but the hot water supply piping 3 has a uniform pressure resistance performance because the piping material differs depending on the site. However, there is a risk of damage due to increased pressure.

In order to prevent this, the hot water supply pipe 3 must also have a high pressure resistance. For this reason, when installing the hot water supply device 6 in the existing hot water supply pipe 3, it is necessary to check the pressure resistance of the hot water supply pipe 3, and if the performance is low, either give up the installation or perform large-scale construction to supply hot water. It was necessary to replace the pipe 3 with one having high pressure resistance. Further, even when the instant hot water supply device 6 is newly installed together with the central heat source 1, etc., it is necessary to select the hot water supply pipe 3 having high pressure resistance performance. In any case, when the immediate hot water supply device 6 is installed, the hot water supply pipe 3 must be installed. There is a problem in that the pressure resistance performance of the above must be considered.

The present invention has been made to solve the above problems, and an object of the present invention is to control the pressure applied to the hot water supply pipe when the heat source in the hot water storage tank operates to expand the water in the hot water storage tank. It is to provide an immediate hot water supply device that does not need to be considered.

[0006]

[Means for Solving the Problem and Its Action / Effect] In order to achieve the above object, the first aspect of the present invention is that a hot water storage tank and hot water supplied from a central heat source such as a gas water heater through a hot water supply pipe to the hot water storage tank. An inlet connection part for leading and an outlet connection part for leading the hot water in the hot water storage tank to the stopper type faucet,
In the instant hot water supply device provided with a heat source for heating the water in the hot water storage tank, the inlet connection part is provided with a pressure propagation preventing means for preventing the propagation of pressure from the hot water storage tank to the hot water supply pipe. Therefore, even if the heat source in the hot water storage tank operates and the water in the hot water storage tank expands, the pressure can be prevented from propagating to the hot water supply pipe.Therefore, it is necessary to consider the pressure resistance of the hot water supply pipe during installation. There is no.

According to a second aspect, in the instant hot water supply apparatus according to the first aspect, there is provided an overpressure relief valve for letting the hot water in the hot water storage tank escape to the outside when the pressure in the hot water storage tank exceeds a predetermined value. . Therefore, when the predetermined pressure is exceeded, the expanded water is discharged from the hot water storage tank, so that excessive pressure is not applied to the hot water storage tank.

In claim 3, claim 1 or claim 2
In the immediate hot water supply device according to the item (1), the pressure propagation preventing means is a check valve. Therefore, the pressure can be prevented from propagating from the hot water storage tank to the hot water supply pipe with a simple configuration.

In claim 4, claim 1 or claim 2
The immediate hot water supply device according to claim 1, comprising: a pressure detection unit that detects the pressure in the hot water storage tank; and an on-off valve that opens and closes the flow path at the inlet connection portion, and the pressure propagation prevention unit is the pressure detection unit. The opening / closing valve is controlled so as to shut off the flow path when the means detects a pressure equal to or higher than a predetermined value. For example, as in the case where the hot water supply pipe is made of resin and has a structure that relieves the pressure, the pressure in the hot water storage tank and the hot water supply pipe may not increase so much. Therefore, in the present invention, since the pressure is actually detected and the flow path of the inlet connection portion is blocked based on the pressure, it is possible to set the pressure resistance of the hot water storage tank to a low level. Even when an overpressure relief valve is provided, the number of operations can be suppressed and the life can be extended.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a connection diagram of an instant water heater 14 according to an embodiment of the present invention. As shown in the figure, the instant water heater 14 has a hot water storage tank 5, a heat source 4, an inlet connection port 8,
Check valve 7 attached to inlet connection port 8 and outlet connection port 1
0, an overpressure relief valve 11, and a temperature detecting device 12 attached to the hot water storage tank 5. The hot water supply pipe 3 coming from the central heat source 1 is connected to the inlet connection port 8 of the instant hot water supply device 14. Further, the outlet connection port 10 is connected with a stopper type faucet 2 which is a hot water supply terminal.

In normal use of hot water, first, when the stopper type faucet 2 is opened, the hot water stored in the hot water storage tank 5 of the instant hot water supply device 14 is discharged from the hot water storage tank 5, and at the same time,
The cold water accumulated in the hot water supply pipe 3 enters the hot water storage tank 5. At this time, the temperature detection device 12 detects the decrease in the water temperature in the hot water storage tank 5 and activates the heat source 4. The heat source 4 is
Even after the stopper type water faucet 2 is closed, the operation is continued until the temperature detecting device 12 reaches a preset temperature (for example, 80 ° C.). By the operation of this heat source 4, the water stored in the hot water storage tank 5 increases in volume and expands in volume, and the pressure in the hot water storage tank 5 rises. This pressure is supplied to the hot water supply pipe 3 due to the check valve 7. Does not propagate. Then, when the pressure rises to the set pressure of the overpressure relief valve 11, the expansion water is discharged from the overpressure relief valve 11.

Since the set pressure of the overpressure relief valve 11 needs to be higher than general feed water pressure, it is at least 0.8.
It is set to MPa or higher. Since the maximum pressure applied to the hot water storage tank 5 and the stopper type faucet 2 is this set pressure, the pressure resistance performance of the hot water storage tank 5 may be determined in consideration of this. On the other hand, as described above, the pressure increase due to the volume expansion of the hot water storage tank 5 does not propagate to the hot water supply pipe 3 due to the function of the check valve 7, so it is not necessary to consider the pressure resistance performance of the hot water supply pipe 3. Therefore, the instant hot water supply device 14 can be installed without being affected by the performance of the hot water supply pipe 3.

FIG. 2 is a connection diagram of an instant water heater 15 according to another embodiment of the present invention. The instant hot water supply device 15 in this embodiment is provided with an opening / closing valve 9 and a pressure detection device 13 instead of the check valve 7 of FIG. In the present embodiment, when the pressure in the hot water storage tank 5 and the hot water supply pipe 3 increases to a predetermined pressure due to the operation of the heat source 4, the pressure detection device 1
The open / close valve 9 is closed by a signal from the switch 3. As a result, a high pressure of a predetermined value or higher is applied to the hot water supply pipe 3
It is possible to prevent hanging.

For example, when the hot water supply pipe is a resin pipe such as a cross-linked polyethylene pipe, the cross-linked polyethylene pipe itself can expand due to the pressure and relieve the pressure, so that the hot water storage tank 5 and the hot water supply can be performed even when the heat source 4 is operating. The pressure applied to the pipe 3 may not exceed the set pressure of the overpressure relief valve 11. In such a case, by installing an opening / closing valve 9 that opens / closes in response to a signal from the pressure detection device 13, the pressure resistance performance of the hot water storage tank 5 is set to a low level, and the number of times the overpressure relief valve 11 is operated is suppressed to reduce the service life. It is possible to extend.

[Brief description of drawings]

FIG. 1 is an instantaneous hot water supply device 14 according to an embodiment of the present invention.
Connection diagram

FIG. 2 is an immediate hot water supply device 1 according to another embodiment of the present invention.
Connection diagram of 5

FIG. 3 is a connection diagram of a conventional instant water heater 6.

[Explanation of symbols]

1 ... Central heat source 2 ... Stop-type faucet 3… Hot water supply piping 4 ... Heat source 5 ... Hot water storage tank 6 ... Instant water heater 7 ... Check valve 8 ... Entrance connection 9 ... Open / close valve 10 ... Exit connection 11 ... Overpressure relief valve 12 ... Temperature detection device 13 ... Pressure detection device 14 ... Instant water heater 15 ... Instant water heater

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Mitsuru Kawaguchi             43-1, Uozakihama, Higashinada-ku, Kobe-shi, Hyogo Japan             Within Yupro Corporation (72) Inventor Toruhiro Uozumi             43-1, Uozakihama, Higashinada-ku, Kobe-shi, Hyogo Japan             Within Yupro Corporation

Claims (4)

[Claims] 1. A hot water storage tank, an inlet connection portion for guiding hot water supplied from a central heat source such as a gas water heater through a hot water supply pipe to the hot water storage tank, and an outlet for guiding hot water in the hot water storage tank to a stopper type faucet. In an instant hot water supply device including a connection part and a heat source for heating water in the hot water storage tank, the inlet connection part is provided with pressure propagation preventing means for preventing pressure propagation from the hot water storage tank to the hot water supply pipe. Immediate hot water supply device. 2. The instant hot water supply apparatus according to claim 1, further comprising an overpressure relief valve that releases hot water in the hot water storage tank to the outside when the pressure in the hot water storage tank exceeds a predetermined value. . 3. The immediate hot water supply apparatus according to claim 1, wherein the pressure transmission preventing means is a check valve. 4. A pressure detecting means for detecting the pressure in the hot water storage tank, and an opening / closing valve for opening / closing a flow path at the inlet connection portion, wherein the pressure propagation preventing means has a predetermined pressure detecting means. The immediate hot-water supply device according to claim 1 or 2, wherein the opening / closing valve is controlled to shut off the flow path when a pressure equal to or higher than a value is detected.