JP3505484B2 - Pipe fitting with flange for water heater - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe joint for a hot water supply apparatus such as a hot water supply apparatus and a hot water supply pressurizing apparatus, and more particularly, to a flange for forming a mounting portion to a case. The present invention relates to an integrated flanged pipe joint for a water heater. 2. Description of the Related Art Generally, as shown in FIG. 7 , a water heater 1 has a case 2 formed of a thin plate such as a stainless steel plate.
Each component such as a burner assembly 3, a heat exchanger (not shown), an electromagnetic pump 4, a power transformer 5, an ignition transformer 6, and a control panel 7, into which a fan and the like are integrally mounted, are incorporated. And a piping such as the same-pressure piping 10. A pipe joint 100a for the water supply pipe 8 and a pipe joint 100b for the hot water supply pipe 9 are attached to the upper surface 2b of the case 2, and a pipe joint 100c for the same pressure pipe 10 is provided on the back surface 2c of the case 2. Installed. Conventionally, the pipe joints 100a to 100c (hereinafter referred to as pipe joints 100
4 ) as shown in FIG.
The flange 101 is brought into contact with the inner surface of the mounting hole 2 a of the case 2, and the screw 12 is screwed into the screw hole 101 a of the flange 101 from the mounting plate 11 which is brought into contact with the outer surface of the case 2. Thus, it is attached to the case 2. The pipe joint 100 which the flange 101 is integrally formed, as shown in FIG. 5 or FIG., Or manufactured by cutting a hatched portion a of the forged product 102 formed into a predetermined outer shape, 6 As shown in (1), it is manufactured by cutting a hatched portion b from a relatively large block 103. However, in this pipe joint 100, a forged product 102 and a block 103 are provided.
Therefore, there is a problem that the number of processing steps and material loss increase, and the cost of the pipe joint 100 tends to increase. That is, in the case of processing from the forged product 102, a forging step is required and the number of processing steps is increased, and material loss occurs in the hatched portion a. In the case of processing from the block 103,
The number of cuts increases, the processing time becomes longer, and the material loss becomes enormous. [0005] In particular, although the flange 101 used for mounting the pipe joint 100 is mounted on the inner surface side of the case 2 of the water heater 1 so as not to be visually recognized from the outside, it is integrally formed with the pipe joint 100. Therefore, the cost cannot be reduced by using an inexpensive material or shape for the flange 101 itself. As a result, inexpensive flange 1
In fact, it is difficult to obtain the pipe joint 100 with 01, and it is a reality that improvement is desired. The present invention has been made in view of such circumstances, and an object of the present invention is to form a flange and a pipe joint main body from materials and the like corresponding to the functions thereof, and to form a pipe joint at low cost. When both to provide a water heater for flanged fitting capable of improving assembling workability. [0007] In order to achieve the above object, according to the first aspect of the present invention, the present invention is applied to a mounting hole portion of a case.
The flange to be attached and the flange are formed separately.
Pipe fitting body, the flange and the pipe fitting body
Is the hole provided in the approximate center of the flange and the flow path of the fitting body.
With flange for hot water supply device integrated with non-contact
A pipe joint, wherein the flange is formed by pressing.
Formed and burring around the hole
The guide portion is formed upright, and the guide portion is
It is located on the inner surface of the case and can be attached to the case
And With this configuration, the flange to be attached to the mounting hole portion of the case and the pipe joint body are formed separately, the flange is formed in a predetermined shape in advance, and the flange and the pipe joint body are integrally formed. Thus, a flanged pipe joint is obtained. As a result, the flange can be formed from an inexpensive material for securing the mounting strength, and the pipe joint body can be formed from a material that is easy to process for ensuring the connectivity of the pipes and the stability of the flow path. A pipe joint is easily obtained. Also, formed by burring around the hole of the flange
Angled between the fitting body and flange
Assembly of the flange and the pipe joint body
Workability is improved. Embodiments of the present invention will be described below in detail with reference to the drawings. 1 to 4 show an embodiment of a pipe joint with a flange according to the present invention. FIG. 1 is a cross-sectional view of the mounted state, FIG. 2 is a front view of the pipe joint, and FIG. illustration showing one example of assembling methods
You. The same parts as those shown in FIG. 7 will be described with the same reference numerals. 1 and 2, a flanged pipe joint 20 (hereinafter simply referred to as a pipe joint 20) includes a pipe joint body 21 and a flange 2 integrated with the pipe joint body 21.
2 are formed. The pipe joint body 21 has, for example, a flow path 23 with a large diameter on the outer side 21b formed at an axial center position inside the pipe joint main body 21. Screw portions 24 for pipe connection are formed respectively. In addition, a step portion 25 as a positioning means is formed on the outer peripheral surface of a substantially central portion in the longitudinal direction of the pipe joint body 21 along the circumferential direction. Meanwhile, the flange 22, both that the hole 22a is formed in the center position, along the inner edge of the hole 22a
Thus, the guide portion 29 is integrally formed. This hole 22a
Is engaged with the step 25 of the pipe joint body 21 at the same time.
In addition, screw holes 26 are formed at both ends in the diameter direction of the guide portion 29, respectively. The flange 22 and the pipe joint body 21 are integrated as follows. That is, first, the pipe joint body 21 and the flange 22 are manufactured. At this time, the manufacture of the pipe joint body 21 is as follows.
It is manufactured by cutting or rolling from an outer diameter, for example, a brass round bar having an outer diameter corresponding to the maximum outer diameter, thereby shortening the processing time and minimizing the occurrence of material loss. The flange 22 is manufactured by , for example, pressing (punching) a stainless steel plate.
After burring, burring is applied to the hole 22a
The dovetail portion 29 is integrally formed, thereby shortening the processing time. The flange 22 and the pipe joint body 21 are manufactured in such a manner that the dimensional accuracy of the hole 22a of the flange 22 and the outer peripheral surface of the step 25 of the pipe joint body 21 is set to the fit dimensional accuracy of the tight fit. the pipe joint body 21 and the flange 22 which is, as shown in FIG. 3, by the pipe joint body 21 into the hole 22a of the flange 22 is fitted as shown by the arrow b,
The pipe joint body 21 and the flange 22 are integrated to form the pipe joint 2
0 is produced. The integration of the pipe joint body 21 and the flange 22 is not limited to the fitting. For example, after the pipe joint body 21 is inserted into the hole 22a of the flange 22,
The joint between the flange 1 and the flange 22 may be fixed by a fixing means such as brazing using a brazing material or welding to be integrated.
In the case of brazing or welding on the case side, for example , the clearance of the brazing material or the welded portion is formed by increasing the inner diameter of the mounting hole 2a of the case 2. The pipe joint 20 manufactured as described above is used.
As shown in FIG. 1, the outer side 21b of the pipe joint body 21
Is inserted into the mounting hole 2a of the case 2 of the water heater 1 from the inner surface side, and the guide portion 29 of the flange 22 is brought into contact with the inner surface of the case 2. Also, the hole 1 into which the pipe joint body 21 is inserted.
A mounting plate 11 having an outer surface 1a,
A screw 12 is attached to the flange 2 from the mounting hole 11b of the mounting plate 11.
2 is screwed into the screw hole 26 of the guide portion 29 . As a result, the pipe joint 20 is attached to the mounting hole 2a of the case 2, and the pipes 8 to 10 are connected to the threaded portion 24 on the inner side 21a of the pipe joint body 21 by screwing. Together with the outer side 21 of the pipe joint body 21
A predetermined external pipe is connected to the screw portion 24 of b in a screw-in manner. In this mounting state, the flange 22 is located on the inner surface side of the case 2 and is not visible from the outside. Therefore, only the function of securing a predetermined mounting strength is required. Inexpensively formed. That is, the pipe joint body 21 and the flange 22 of the pipe joint 20 are formed separately,
Flow path 23 and hole 22a of flange 22 in a non-contact state,
Since the flange 22 does not affect the water flowing in the flow path 23 at all, the flange 22 is required to have a function for securing the mounting strength to the case 2.
It is required to ensure the stability of the pipes and to ensure and easily connect the pipes 8 to 10 and the external pipes . The pipe joint body 21
The connection of the various pipes 8 to 10 and the like is not limited to the screw-in type, and can be connected with, for example, a quick fastener,
In such a case, the screw portion 24 of the pipe joint body 21 may be omitted. As described above, in the pipe joint 20 of the above-described embodiment, the pipe joint body 21 and the flange 22 are formed separately, and they are fitted together, or after the fitting and insertion, the joint is brazed. For example, the pipe joint main body 21 can be manufactured by cutting (or rolling) a round bar having an outer diameter corresponding to the maximum outer diameter, and a forging process is unnecessary. For example, the number of processing steps can be reduced, the material loss can be suppressed to a necessary minimum, and the pipe joint 20 can be formed at low cost. In particular, when the threaded portion 24 is formed on the outer side 21b or the inner side 21a of the pipe joint body 21 to form the pipe joint 20 into a screw-in type, the threaded portion 24 can be formed by rolling. The pipe joint main body 21 can be machined with little material loss from the brass round bar having the maximum outer diameter, the cost can be reduced, and the cheaper pipe joint 20 can be obtained. Further, since the pipe joint body 21 and the flange 22 are separate bodies, a material corresponding to the function can be used for the pipe joint body 21 and the flange 22, and the range of material selection is expanded.
It is possible to easily obtain the pipe joint 20 capable of simultaneously achieving the cost reduction and the function assurance. In particular, it is not necessary to adopt an expensive material or a complicated processing method for the flange 22 that is disposed on the inner surface of the case 2 and is not visible from the outside, and it is not necessary to worry about appearance (appearance), and a predetermined mounting strength can be secured. For example, a material such as a stainless steel plate can be used, so that an optimum material according to the function can be used effectively. Furthermore, since the hole 22a of the flange 22 is burred and the guide portion 29 is formed upright, the angle between the pipe joint body 21 and the flange 22 can be accurately set, and the two members are assembled. Workability is further improved, and the pipe joint 20 can be formed at lower cost. In the above embodiment , the case where the positioning is performed between the flange 22 in the longitudinal direction of the pipe joint body 21 has been described. In the case of positioning between them, for example, positioning means such as serrations and splines may be provided on the outer peripheral surface of the pipe joint body 21 or the inner surface of the hole 22a of the flange 22. In the above embodiment , the step 25 is formed as the positioning means. However, the positioning means may be formed by a step or a recess (convex) having an appropriate shape such as an arc-shaped cross section or a triangular shape. it can. In addition, the above implementation
The overall shapes and materials of the pipe joint body 21 and the flange 22 in the examples , the mounting structure of the pipe joint 20 to the case 2, the form of the water heater 1 and the like are also examples, and do not depart from the gist of each invention according to the present invention. It can be changed appropriately within the range. As described in detail above, according to the first aspect of the present invention, a pipe joint body having a press-processed flange attached to an attachment hole portion of a case of a water heater and a flow path. Are formed separately, and these are integrated to form a flanged pipe joint, so that the cost of the flange itself can be reduced and a material corresponding to the functions required for the flange and the pipe joint body can be used. For example, an inexpensive flanged pipe joint can be easily obtained. Also, the flange
Since the guide part is formed upright around the hole of
The fitting makes it easy to set the angle between the fitting body and the flange.
And the workability of assembling both members can be improved.
Has the effect of

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view of an attached state showing an embodiment of a flanged pipe joint for a hot water supply apparatus according to the present invention. FIG. 2 is a front view of the pipe joint. FIG. FIG. 4 is an explanatory view showing an example of a method of assembling a joint. FIG. 4 is a cross-sectional view showing an attached state of a conventional pipe joint with a flange. FIG. 5 is an explanatory view showing a method of manufacturing the pipe joint. FIG. 7 is a schematic side view showing an example of a water heater to which the present invention is applied. [Description of symbols] 1. hot water heater, 2. case, 2a mounting hole, 2b
· Top, 2c · · · Back, 8 · · · Water supply piping, 9 · · Hot water supply piping, 10 · · · Same pressure piping, 11 · · · Mounting plate, 12 · · · Screw, 20 · · · Fitting with flange, 21 · · · pipe Fitting body, 22 flange, 22a hole, 23 flow path,
24 screw part, 25 step part, 26 screw hole, 29
..Guide part.

Claims (1)

(57) [Claims] [Claim 1] A flag attached to an attachment hole of a case
A pipe joint body formed separately from the flange;
Wherein the flange and the fitting body are substantially
When the hole provided in the center and the flow passage of the
A flanged pipe joint for a water heater that is integrated, wherein the flange is formed by press working.
The guide part rises around the hole by burring
And the guide portion is located on the inner surface side of the case.
For water heaters that can be attached to the case
Fitting with flange.