JPH0423176B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Application] The present invention relates to a method for installing a heater for preventing freezing in a water heater, and in particular, a method for installing a heater to prevent freezing in a water heater that uses a heater as an anti-freezing device. In order to prevent freezing, it is planned to simplify assembly and simplify repair and inspection by making it possible to install anti-freezing heaters of the same configuration to each main part of the piping route of the water circuit.

[Prior art and its problems] Recently, in order to prevent water heaters from freezing, there has been a
A heater unit as disclosed in Japanese Patent No. 164202 is employed.

As shown in FIG.
1 is covered with an insulator 12, and one side of this insulator has an arc-shaped recess 13. When installed with the recess 13 facing the piping of a water circuit, the piping and the insulator are tightly sealed. The tubular piping portion P is heated by the electric heat from the resistance element 11 and is prevented from freezing.

Particularly in large-sized water heaters, the water circuit thereof is complicatedly curved, so in order to prevent freezing of the entire piping inside the appliance, it is necessary to install a large number of the heater units H at required locations. Since the copper tubular piping section P of the water circuit is composed of pipes having the same diameter, each heater unit H can be attached to the tubular piping section P using a common attachment means. However, functional parts such as hydraulic pressure-responsive gas valves, which are the parts most likely to freeze, do not have the same structure as the copper pipe piping, and a special mounting structure must be adopted.

As described above, if a plurality of the above-mentioned conventional heater units H are simply employed in a conventional water circuit as an antifreeze device for a water heater, the installation work of the antifreeze device becomes troublesome.

Furthermore, since parts cannot be shared, it becomes more expensive.

[Technical Problem] The present invention is directed to a system in which a large number of heater units H each having a concave portion 13 having an arcuate cross-section formed on one side are installed in desired parts of a water circuit to prevent the entire area of the water circuit from freezing. In “Anti-freezing structure of water heater”,
In addition to simplifying the antifreeze structure of water heaters,
In order to simplify the repair and inspection of antifreeze equipment,
The technical problem is to be able to employ the same type of heater unit H and its mounting means.

[Technical Means] The technical means of the present invention taken to solve the above-mentioned technical problem is that ``the tubular piping is installed on the surface of a functional component such as a water pressure responsive gas valve that is built into a water heater and is other than the tubular piping section P. An arcuate section 20 having the same curvature as the section of section P is formed, the angular range of this arcuate section 20 is set to 180 degrees or more, and a gripping means for attaching the heater unit H to the water circuit is attached to the heater. The overall shape is approximately U so that the cross section of the unit H is surrounded by a surface other than the recess 13 and both ends can protrude toward the recess 13.
Both ends of the gripping means are formed into a letter-shaped or substantially C-shaped shape, and the concave portion 13 of the heater unit H is attached to the surface of the tubular piping portion P and the arcuate cross-section portion 20 to surround the heater unit H. The heater units H are electrically connected to each other by being sandwiched and engaged with the piping portion P and the exposed portion of the arcuate cross-section portion 20.

[Operation] The above technical means of the present invention operates as follows.

First, in order to attach the heater unit H to the water circuit of the water heater, the tubular piping section P is attached to the surface of the tubular piping section P in advance, and the recess 13 of the heater unit H is attached to the surface of the tubular piping section P. Alternatively, a separate gripping means is fitted onto the attached heater unit H, and both ends thereof are engaged with the curved surface of the tubular piping section P on the side opposite to the attached section. As a result, a large number of heater units H, H are attached to required areas of the tubular piping portion P. Therefore, the heat generated in the heater unit H is conducted from the contact surface between the recess 13 and the tubular piping part P to the tubular piping part P, thereby preventing the attachment part of the heater unit H and its vicinity from freezing under freezing temperature conditions. It can be prevented.

Next, since a functional component such as a water pressure-responsive gas valve included in the water circuit and connected to the tubular piping section P has an arcuate cross section 20, the heater unit H using the gripping means,
Attach it in the same way as when attaching it to the tubular piping section P described above. As a result, the outer circumferential surface of the arcuate cross section 20 formed in a part of the functional component and the recess 13 of the heater unit H come into close contact with each other, so that the amount of heat generated by the heater unit H is effectively conducted to the functional component. becomes.

In addition, each heater unit H is electrically connected in advance or is electrically connected after being installed as described above, and when the temperature inside the water heater or the outside air drops to near the freezing temperature of the water circuit. The water circuit becomes electrically conductive, and the above-mentioned heat conduction effect prevents the entire water circuit from freezing.

[Effects] Since the present invention has the above configuration, it has the following unique effects.

Since the heater unit H and the gripping means to be attached to the tubular piping portion P can be attached to the water pressure responsive gas valve in the same manner as they are, attachment of the heater unit H to the water circuit of the water heater can be simplified. Therefore,
The workability of assembling a water heater antifreeze device is further improved.

In addition, when repairing the antifreeze device of a water heater equipped with multiple heater units H, when converting the heater unit H, even if any heater unit H is damaged, only one type of heater unit H can be gripped. All you have to do is prepare the means, and the repair will be easy.

[Example] Hereinafter, an example of the present invention will be described based on FIGS. 1 to 6.

The first embodiment shown in FIGS. 1 to 6 is implemented in a forced combustion type water heater, as shown in FIG. The heater units H, H are attached to the piping section P and the required parts of the hydraulic responsive gas valve 2 connected to the tubular piping section P. The heater unit H is attached as shown in FIG. 3, and the heater unit H is attached to the hydraulic responsive gas valve 2 as shown in FIGS. 4 and 5.

The details of each part will be explained below based on these drawings.

In this embodiment, the heater unit H and the gripping means are constructed as shown in FIG. The cords 14, 14 connected to the resistance element 11 are led out from the insulator 12, and one surface of the rectangular parallelepiped insulator 12 has a recess 1 over the entire longitudinal direction.
3, and the curvature of this recessed portion 13 is made to match the curvature of the surface of the tubular piping portion P.

Next, as a gripping means, a clip 3 made of a metal elastic plate and having a substantially U-shaped cross section is adopted, and as shown in the same figure, this clip 3 is a gripping means that fits exactly on three sides other than the recess 13. part 31 and this grip part 3
It consists of bent ends 32, 32 extending from the open end edge of 1 and bending inward. Moreover, this bent end portion 32,
The distance between the inner edges of 32 is set smaller than the diameter of the tubular piping portion P.

Next, the configuration of the hydraulically responsive gas valve 2 will be described in detail. As shown in FIG. The diaphragm 23 responds,
A spindle 24 interlocked with this diaphragm 23
This opens the valve device 51 inserted into the gas circuit 5. The previously described arcuate cross section 20 is formed in a part of the joint 25 that is connected to the main body of the hydraulically responsive gas valve 2 . This joint 25 is
It is also used to fix the water circuit 21 and the main body of the water pressure responsive gas valve 2 to the side wall of the water heater body A, and a flange provided on the inlet side of the joint 25 is screwed to the side wall.

As shown in FIG. 5, the cross-sectional shape of the arcuate section 20 is composed of a shaft portion having the same diameter as the tubular piping portion P and a neck portion 26 having a wall thickness thinner than the diameter of this shaft portion. The arcuate cross section 20 is integrally connected to the joint 25. Note that this joint 25 is made of die-casting, and the arcuate cross section 20 is integrally molded when the joint 25 is molded.

In the case of the water heater configured as described above, when attaching the heater unit H to the tubular piping section P and the arcuate section 20 of the hydraulically responsive gas valve 2, the clip 3 must be attached to the heater unit H in advance. Then, the bent ends 32, 32 of this clip 3 are connected to the tubular piping part P.
When the heater unit H is engaged with the neck portion 26 of the curved surface portion or the arc-shaped cross section portion 20 on the side of the can body 10, the heater unit H is attached and fixed to the columnar portion by the clip 3.

Next, in this embodiment, the ventilation function section 6,
The can body 10 and the exhaust top 7 are assembled as one unit, and as shown in FIG. Locking pieces 72, 72 are bent and formed at the top of both ends of one of the upper mounting bars 61.

On the other hand, screw holes 8, 8 are formed in the rear wall of the body A, where the mounting bar 71 and the lower mounting bar 61 face each other, at positions that coincide with the mounting holes provided in the ventilation function section 6 and the exhaust top 7. Further above the upper screw holes 8, 8, locking holes 73, 73 are formed at regular intervals therebetween.

Therefore, the locking pieces 72, 72 are inserted into the locking hole 7.
3, 73, the entire unit of the can body 10 is suspended by the container body A, and then the upper mounting bar 71 and the lower mounting bar 61 are screwed into the screw holes 8, 8. Then, the unit will be attached to the vessel A.

[Brief explanation of drawings]

Fig. 1 is a sectional view of an embodiment of the present invention, Fig. 2 is an explanatory diagram of the mounting structure of the unit of the can body 10 to the vessel body A, Fig. 3 is a sectional view taken along the line X-X, and Fig. 4 is a hydraulic response A cross-sectional view of the vicinity of the gas valve 2, FIG.
6 is an explanatory diagram of the heater unit H used in the present invention, and FIG. 7 is an explanatory diagram of a conventionally known heater unit H. , H... heater unit, P...
Tubular piping section, 20...Circular cross-section section.

Claims (1)

[Claims] 1. In a water heater anti-freeze structure that prevents the entire water circuit from freezing by installing a large number of heater units H each having concave portions 13 having an arcuate cross section on one side in required parts of the water circuit, An arcuate cross section 20 having the same curvature as the cross section of the tubular piping portion P is formed on the surface of a functional component such as a hydraulically responsive gas valve other than the tubular piping portion P, and the angular range of this arcuate cross section 20 is The holding means for attaching the heater unit H to the water circuit is set at 180 degrees or more, and the overall shape is such that it surrounds the cross section of the heater unit H other than the recess 13 and both ends can protrude toward the recess 13. Both ends of the gripping means are formed into a substantially U-shape or a substantially C-shape, and the concave portion 13 of the heater unit H is attached to the surface of the tubular piping portion P and the arcuate cross-section portion 20 to surround the heater unit H. These tubular piping parts P
and clampingly engages with the exposed portion of the arcuate cross section 20,
A method of installing a freeze prevention heater in a water heater in which these heater units H are electrically connected to each other.