JPH068443Y2 - Hot water supply device with function to prevent abnormally high temperature hot water supply - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial field of application> The present invention relates to a hot water supply apparatus with an abnormal high temperature hot water prevention function, which can prevent unexpectedly high temperature hot water from being supplied.

<Prior Art> Hot water supply temperature control in a hot water supply device is performed by, for example, a temperature detection sensor for entering or exiting hot water, a fuel control valve, a water amount detection sensor, and a control unit that controls them. When there is a failure, there has been a problem in that hot water supply of extremely high temperature is continued for a considerable time before the thermal fuse and the bimetal switch of the safety device are activated. Further, in such a case, for example, when a resin pipe such as a polyethylene pipe is used for the pipe member, there is a great concern that the resin pipe may be damaged by the high temperature water and cause a serious accident.

To deal with such a problem, the conventional method is, for example, the Japanese Utility Model Laid-Open No. 50-114753.
The water heater described in Japanese Patent Publication is provided. This conventional example will be described with reference to FIG. In this device, a bypass pipe 4 that does not pass through the heat exchanger 3 is connected from the water inlet pipe 1 to the hot water outlet pipe 2, and the bypass pipe 4 can be opened and closed by a heat responsive valve 5 interposed on the hot water outlet pipe 2 side. Is. When the temperature of the hot water passing through the inside of the hot water outlet pipe 2 becomes high, the valve 5b is opened by the heat sensitive portion 5a, and water is mixed from the water inlet pipe 1 through the bypass pipe 4 to the hot water outlet pipe 2.

<Problems to be Solved by the Invention> However, in the above-mentioned conventional device, since the bypass pipe 4 branches downstream from the water amount detection unit 7 for controlling the combustion of the burner 6, the water branches into the bypass pipe 4. As a result, the amount of water passing through the heat exchanger 3 is reduced, and even if the amount of water falls below the minimum working water amount, the water amount detection unit 7 cannot detect it, and the burner 6 continues to burn, resulting in heat generation. It left a dangerous problem that the inside of the exchanger was further overheated.

Further, in the above-mentioned conventional apparatus, since the heat-responsive valve 5 is attached to the hot water discharge pipe 2 and the bypass pipe 4, there is a drawback that the regulation on the pipe is large and the assembly is not easy. .

Therefore, the present invention solves the above-mentioned drawbacks of the conventional device, and can reliably prevent abnormal high-temperature water from being supplied even when the temperature control unit of the water heater is out of order, and its configuration An object of the present invention is to provide a hot water supply device with an abnormally high temperature hot water supply prevention function, which is easy to assemble and piping.

<Means for Solving the Problem> The hot water supply device with the function of preventing abnormally high temperature hot water supply of the present invention is a heat exchanger.
10, a water inlet pipe 11 to the heat exchanger 10, a hot water outlet pipe 12 from the heat exchanger 10, a water amount detection sensor 14 provided in the middle of the water inlet pipe 11, and a water amount by the water amount detection sensor 14. Is a burner 13 that is burned only when the minimum working water amount or more, a branch water pipe 19 branched from the upstream side of the water amount detection sensor 14 of the water inlet pipe 11, and hot water flowing through the hot water outlet pipe 12 only when the temperature is abnormally high. A hot water supply apparatus with an abnormally high temperature hot water prevention function having an abnormally high temperature hot water mixing device (20) that mixes water with hot water supplied through a branch water pipe (19) and guides it to a hot water supply pipe (30). It is composed of one tubular body that constitutes three chambers, A and C and a central chamber B communicating with them, and the hot water outlet pipe 12 is connected to one of the chambers A on both sides and a heat-sensing part is provided inside. 24 and its operating rod 24a
The branch water pipe 19 is connected to the other chamber C on both sides, the communication port 26 with the central chamber C is always closed inside, and is pushed by the operating rod 24a only at an abnormally high temperature. A spring-biased water stop valve 28 for opening the communication port 26 is provided, and the hot water supply pipe 30 is connected to the central chamber B.

<Operation> During normal hot water supply, water enters the heat exchanger through the water inlet pipe, is heated to a predetermined temperature, and is supplied from the hot water outlet pipe as it is through the mixer at abnormally high temperatures. If the hot water discharged from the heat exchanger becomes abnormally high due to a malfunction in the control unit or other reasons,
When the temperature is abnormally high, the mixer operates to mix water with hot water from the hot water through the branch water pipe. This alleviates the temperature and eliminates the risk of damage to the hot water supply pipe, burns, and the like. Especially by branching the branch water pipe from the upstream side of the water amount detection sensor,
By flowing water to the branch water pipe side at an abnormally high temperature, the amount of water passing through the water amount detection sensor can be made less than the minimum operating water amount, and combustion of the burner can be stopped.

Further, the mixing machine 20 at abnormally high temperature is composed of one tubular body, and the hot water supply pipe 12 is connected to this one side, the branch water pipe 19 is connected to the other side, and the hot water supply pipe 30 is connected to the central part. The circuit for preventing abnormally high temperature hot water supply is completed. Normally, the hot water that has entered the chambers A on both sides from the hot water outlet pipe 12 passes through the central chamber B as it is and flows out to the hot water supply pipe 30. At this time, the water from the branch water pipe 19 enters the other chamber C, but since the communication port 26 to the central chamber B is closed by the water stop valve 28 urged by the spring 27, the central chamber B is closed. Can not enter, and therefore cannot be mixed with water. On the other hand, when the hot water from the heat exchanger 10 reaches an abnormally high temperature, the operating rod 24a of the heat-sensing part 24 reacted by the abnormally hot water entering the chamber A causes the water shutoff valve 28 of the chamber C to spring 27.
It is pushed against and opens the communication port 26 to the chamber B. As a result, the water from the branch water pipe 19 passes through the chamber C and enters the chamber B,
Mixed water is made.

The mixing device 20 at abnormally high temperature is completed in a form in which all the necessary members are housed in one tubular body, and the hot water pipe 12, branch water pipe 19 and hot water supply pipe 30 are connected to the tubular body. It is possible to complete the function of preventing abnormally high temperature hot water supply. Therefore, the structure of the mixer 20 at an abnormally high temperature becomes very simple, and therefore the degree of freedom of piping is great, and the assembly work is very easy and simple. Also, chambers A, B in the tubular body,
The Cs are also arranged on both sides and in the center, which is a very simple structure. Since the room A is reliably filled with hot water from the hot water outlet pipe 12, the heat-sensitive portion 24 can reliably react with the hot water from the hot water outlet pipe 12.

<Embodiment> FIG. 1 is an overall configuration diagram of an apparatus for carrying out the present invention, and FIG. 2 is a vertical cross-sectional view of an abnormally high temperature mixer.

The water inlet pipe 11 and the hot water outlet pipe 12 are connected to the heat exchanger 10, and the water sent from the water inlet pipe 11 to the heat exchanger 10 is heated by the burner 13 to become a predetermined hot water and is discharged to the hot water outlet pipe 12. To be done.
The water inlet pipe 11 is provided with a water amount detection sensor 14 capable of detecting the minimum working water amount of water sent to the heat exchanger 10, and when the water amount detection sensor 14 detects less than the minimum working water amount, the control unit 15 Via 16 or directly, the valve 16 is closed and combustion of the burner 13 is stopped. Reference numeral 17 is a main opening / closing valve, and 18 is a fuel proportional control valve.

A branch water pipe 19 is branched from a water inlet pipe 11 upstream of the water amount detection sensor 14, and the branch water pipe 19 and the hot water outlet pipe 12 are connected to a mixer 20 at an abnormally high temperature. A hot water supply pipe 30 is connected and extended from the mixer 20 at an abnormally high temperature.

The abnormally high temperature mixing device 20 has the hot water outlet pipe 12 at both ends.
Having a connection port 21 for connecting with and a connection port 22 for connecting with the branch water pipe 19,
It is composed of a single cylindrical body having a connection port 23 with the hot water supply pipe 30 in the vicinity of the center, and has three chambers A, B and C in the case. Room A is a room for receiving hot water from the hot water outlet pipe 12, and a wax thermosensitive portion 24 is supported inside by a support 25 and is arranged at a position facing the hot water from the connection port 21. The room B is a room between the rooms A and C on both sides and is a room for sending hot water to the hot water supply pipe 30.
The chamber C is a chamber that receives water from the branch water pipe 19, and the communication port 26 to the chamber B is a water shutoff valve in which a spring 27 is urged.
It is closed at 28. And this passive valve 28 stop rod
28a is held in contact with the operating rod 24a of the heat-sensitive portion 24. The chamber A and the chamber B are in communication with each other.

The wax thermosensitive section 24 is sensitive to the hot water from the hot water outlet pipe 12, but at the normal hot water temperature expected from the beginning, the water shutoff valve 28 is only opened via the operating lot 24a. It is said that it does not expand. Therefore, in normal times, that is, when the hot water supply device is operating normally, the hot water from the hot water outlet pipe 12 enters the room A, further enters the room B, and then flows out to the hot water supply pipe 30. During this time, no water is introduced from the branch water pipe 19 into the room B through the room C.

On the other hand, when the hot water from the heat exchanger 10 becomes abnormally high in temperature due to some failure, the abnormally high temperature water enters the chamber A in the mixer 20 at the time of abnormally high temperature, so that the heat sensitive section 24 expands and the operating rod 24a becomes a spring. Open the water shutoff valve 28 against 27. As a result, the water from the branch water pipe 19 flows into the room B, and the mixed water flows into the hot water supply pipe 30. That is, the temperature is relaxed, and heat damage and burns of hot water supply pipe 30 are prevented. Further, by branching the water to the branch water pipe 19, when the amount of water passing through the water amount detection sensor 14 becomes less than the minimum operating water amount of the device, the combustion of the burner 13 is stopped, so that further abnormal high temperature water Hot water is prevented. Whether or not the amount of water passing through the water amount detection sensor 14 is less than the minimum working water amount is determined by the total amount of incoming water and the amount of water flowing into the branch water pipe, and the amount of water flowing into the branch water pipe 19 is the size of the branch water pipe 19 and the stop valve 28. It depends on the openness of. Therefore, the burner 13 combustion can be stopped under conditions according to the degree of abnormally high temperature and the total amount of water entering, by adjusting and configuring those relationships in advance.

In the above embodiment, the combustion control, the hot water supply temperature control, and other controls during normal times are not particularly limited, and it goes without saying that various conventionally known means can be adopted.

<Effect> The present invention is configured as described above, and when the hot water discharged from the heat exchanger is at an abnormally high temperature, the mixing device mixes the hot water with the hot water at the abnormally high temperature through the branch water pipe. The abnormally high temperature water is prevented from being supplied. Therefore, it is possible to prevent problems and accidents due to the user being burned and the hot water supply pipe preferably made of synthetic resin being thermally damaged.

In particular, when hot water is discharged at an abnormally high temperature, water is branched from the water inlet pipe upstream of the water amount detection sensor, so the amount of water detected by the water amount detection sensor tends to be less than the minimum operating water amount of the device, which causes burner combustion to stop. The effect of doing is also demonstrated.

Further, in the present invention, since the mixing device 20 at abnormally high temperature is completed in a form in which all the necessary members are housed in one cylindrical body, the shape is very simple and the handling is very easy. At the same time, there is a large degree of freedom in the piping of the tap water pipe 12 and the branch water pipe 19, and the assembly and construction of the device is very easy and simple. In addition, the inside of the cylindrical body has a simple structure in which the chambers A, B, and C are lined up in one row, and is easy to make and has good durability.
In addition, the reaction of the heat-sensitive section 24 that immediately responds to the temperature of the hot water from the tap pipe 12 can be reliably obtained.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram of an apparatus for carrying out the present invention, FIG. 2 is a longitudinal sectional view of an abnormally high temperature mixer, and FIG. 3 is a configuration diagram of a conventional apparatus. 10: Heat exchanger 11: Water inlet pipe 12: Hot water outlet pipe 13: Burner 14: Water amount detection sensor 19: Branch water pipe 20: Abnormal high temperature mixer 24: Wax thermosensitive part 28: Water stop valve 30: Hot water supply pipe

Front page continued (72) Inventor Minoru Shimizu 32, Akashi-cho, Chuo-ku, Kobe-shi, Hyogo In stock company Noritsu (72) Inventor Toshikatsu Yagyu 32, Akashi-cho, Chuo-ku, Kobe, Hyogo In stock company Noritsu (56 ) References JP 62-142956 (JP, A) Actually open 50-114753 (JP, U) Actually open 57-5656 (JP, U)

Claims (1)

[Scope of utility model registration request] 1. A heat exchanger 10 and a water inlet pipe 11 to the heat exchanger 10.
A hot water outlet pipe 12 from the heat exchanger 10, a water amount detection sensor 14 provided in the middle of the water inlet pipe 11, and a burner 13 that is burned only when the water amount detected by the water amount detection sensor 14 is equal to or higher than the minimum working water amount. A branch water pipe 19 branched from the upstream side of the water amount detection sensor 14 of the water inlet pipe 11, and the hot water flowing through the hot water outlet pipe 12 is mixed with the hot water of the hot water flowing through the branch water pipe 19 only when the temperature is abnormally high. A hot water supply device with an abnormally high temperature hot water prevention function, which has an abnormally high temperature mixer 20 leading to a hot water supply pipe 30, wherein the abnormally high temperature hot water mixing device 20 includes chambers A and C on both sides and a central chamber B communicating with them. It is composed of a single cylindrical body that constitutes three chambers, and the hot water pipe 12 is connected to one chamber A on both sides of the chamber A and the heat sensitive portion 24 and its operating rod 24a are provided inside the chamber A on the other side. When the branch water pipe 19 is connected to the chamber C of A spring-biased water shutoff valve 28 that constantly closes the communication port 26 with the central chamber C and is pushed by the operating rod 24a to open the communication port 26 only when the temperature is abnormally high is provided inside A hot water supply apparatus with an abnormally high temperature hot water supply prevention function, characterized in that the hot water supply pipe 30 is connected to a central room B.