JP2863891B2 - Nozzle fixing structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for fixing a nozzle of a gas burner, and more particularly to a structure for connecting a nozzle and a metal pipe to a mounting bracket connected to a mixing pipe.

[0002]

2. Description of the Related Art In the case of an infrared burner or the like, a nozzle of a gas burner is often attached to a thin metal pipe such as a copper pipe. In such a case, a method is adopted in which a mounting bracket is continuously connected to the mixing pipe of the gas burner, and the mounting bracket is mounted on the mixing pipe so as to secure coaxiality between the nozzle and the mixing pipe.

[0003] Such a system is proposed in Japanese Utility Model Laid-Open Publication No. Sho 61-23028. In this system, a nozzle is screwed and mounted on a die-cast bracket (nozzle holder), and a screw mounting portion is provided. A thin metal pipe such as a copper pipe is connected to the connection thread on the opposite side. By positioning the mounting position of the bracket in advance in relation to a mounting bracket (mounting plate) connected to the mixing tube and screwing the bracket under these conditions, coaxiality between the nozzle and the mixing tube is ensured.

However, the following problem remains in this conventional device. a, since the bracket (nozzle holder) is mounted on the mounting bracket (mounting plate) in a cantilevered state, if internal stress remains in the thin-walled metal pipe, if the internal stress remains for a long time, the internal The stress impairs the coaxiality of the nozzle and impairs combustion performance.

B. When connecting the thin metal tube to the nozzle, a metal fitting for connecting the thin metal pipe, specifically, a metal fitting for screw connection is required separately. Work such as welding is required. The present invention has been made in view of such a point, and is described as follows. "A mounting bracket is continuously connected to a mixing pipe of a gas burner, and a nozzle is coaxially fixed to the mixing pipe by a bracket mounted thereon. Nozzle fixed structure ", it is easy to connect with a thin metal tube connected to this nozzle, and this is stable over a long period of time. In addition, the distance between the nozzle and the mouth of the mixing tube is increased. The task is to keep it constant.

[0006]

[Technical Means] The technical means of the present invention for solving the above-mentioned problem is as follows: "The mounting bracket (2) connected to the mixing pipe (B) of the gas burner is a partially open box made of a metal plate. , opening on the wall surface (21) facing the mouth of the mixing tube of the box body (B) (B ₁₎
(22), and a bracket (3) having a nozzle mounting plate (31) having a U-shaped cross section and parallel to the wall (21) is detachably screwed to the wall (21). A gourd-shaped long hole (32) is formed in the nozzle mounting plate (31).
A small arc portion (33) located coaxially with respect to the mouth portion (B ₁ ).
And a shape having a large arc portion (34) deviating from this,
The nozzle (4) has a mounting flange (41) attached to the inner surface of the nozzle mounting plate (31) and screwed concentrically with the small arc portion (33), and a thin metal plate on the inlet side. tube
An insertion opening (42) for inserting the end of (5) is formed, and a pull-out part (51) is provided at a position away from the tip of the thin metal tube (5).
The insertion opening (42) is large enough to insert the cording portion (51), and the large arc portion (3) of the long hole (32) is formed.
4) is set to a size in which the cording portion (51) can be inserted, and the size of the small arc portion (33) is made to substantially match the diameter of the thin metal tube (5), and the thin metal tube (5) The sealing gasket (P) was press-fitted between the distal end tubular portion (52) on the distal end side of the pull-out portion (51) and the insertion opening (42). "

[0007]

The above technical means operates as follows. The mounting position of the mounting bracket (2) and bracket (3) is the mixing pipe (B)
Since the dimensions of each part are set in advance so that the small arc portion (33) of the long hole (32) is coaxial with the small arc portion (33), the nozzle (4) is screwed into a predetermined position on the nozzle mounting plate (31). In the stopped state, coaxiality between the mixing pipe (B) and the nozzle (4) is ensured.

Also, a fitting (2) for attaching to the mixing pipe (B)
Since the distance between the wall (21) and the distance between the wall (21) and the nozzle mounting plate (31) of the bracket (3) are set at predetermined intervals in advance, the mixing pipe (B) and the nozzle (4) Is also a predetermined dimension. The bracket (3) to which the thin-walled metal tube (5) is continuously provided is formed in a U-shaped cross section, so that the nozzle mounting plate (3) to which the thin-walled metal tube (5) is continuously provided is provided.
1) is in a state where both ends are supported. Therefore, this nozzle mounting plate
(31) That is, the holding strength of the end of the thin metal tube (5) by the bracket (3) is sufficient.

Further, the nozzle (4) is attached to the nozzle mounting plate (31).
To connect the thin metal tube (5) with the slot (32)
Insert the tip of the thin-walled metal tube (5) from the side of the large arc (34), and fit the sealing gasket (P) onto the tip tube (52) on the tip of the stringing portion (51). This is inserted into the insertion opening (42), and is attached to the inner surface side of the nozzle mounting plate (31) by the mounting flange (41), and the mounting flange (41) and the nozzle mounting plate (31) are screwed. I do. At the time of this screw fixing, the cording part (51) is inside the nozzle mounting plate (31) and
It has been moved to the (33) side. As a result, the nozzle (4) was screwed to the inner surface of the nozzle mounting plate (31).
In this state, since the thin metal tube (5) and the nozzle (4) coincide with the small arc portion (33), the above-described coaxiality is ensured, and the cording portion (51) is connected to the small arc portion (33). The nozzle (4) and the thin-walled metal tube (5) are connected to each other, and the airtightness between them is ensured by the distal end cylinder (52) and the insertion opening (42).
And the seal packing (P) interposed between them.

[0010]

[Effect] Just by screwing the nozzle (4) into a predetermined position on the nozzle mounting plate (31), coaxiality with the mixing pipe (B) is ensured and the mouth (B) of the mixing pipe (B) is secured. ₁ ) and the interval is set appropriately. Also, airtight connection between the thin metal tube (5) and the nozzle (4) can be ensured only by attaching the nozzle (4) to the nozzle mounting plate (31) while being fitted with the thin metal tube (5). The work of mounting the nozzle (4) and connecting the thin metal pipe (5) can be simplified.

In addition, a circuit connecting portion between the thin metal tube (5) and the nozzle (4) is provided with a sealing packing (P) interposed between the insertion opening (42) and the end tube (52). Therefore, there is no fear that the airtightness of the connection portion is impaired.

[0012]

Next, an embodiment of the present invention will be described in detail with reference to the drawings. In this embodiment, the mixing tube (B) of the infrared burner is used.
Is obtained by employing the present invention, as shown in FIGS. 1 to 3, the mounting bracket (2) is continuously provided on the mouth of the mixing tube (B) (B _1), which the bracket (3) The nozzle (4) is mounted on the nozzle mounting plate (31) of the bracket (3).

The mounting bracket (2) has a base section (2a) having a U-shaped cross section to be mounted on the opening (B ₁ ), and a similar U-shaped cross section which is screwed to a side wall plate on both sides thereof. becomes because the relay board configured to Jo and (2b), the relay plate (2b) were allowed to extend to the mouth portion from both sides (B ₁₎ side wall facing said opening portion (B ₁₎ (21) leg plate (23) (23) is screwed to the side walls of the base section (2a), the interval of the mouth portion and (B ₁₎ and the wall (21) is set to the interval determined in advance. Thus, a box-shaped mounting bracket (2) having both sides opened with respect to the axis of the mixing pipe (B) is obtained.

As shown in FIG. 4, a rectangular opening (22) is formed in the wall (21), and a pair of mounting pieces (24) and (25) are provided near the opening (22). It projects to the opposite side to (B). As shown in FIG. 5, the bracket (3) has a U-shaped cross section, and a pair of mounting legs (35) and (36) protrude from opposing sides of a rectangular nozzle mounting plate (31). The mounting feet (35) and (36) are screwed to the mounting pieces (24) and (25), and the bracket (3)
And the mounting bracket (2) are connected. The mounting leg
(35) (36), positioning projections (37) (37) are continuously provided at the tip, and positioning holes (26) (26) (25) provided near the mounting pieces (24) (25) on the wall surface (21) The screw is screwed in the above-mentioned manner in a state of being fitted in 26). The positioning positions of the positioning projections (37) and (37) and the positioning holes (26) and (26) are vertically shifted (asymmetrical positions in the vertical direction).
(3) cannot be mounted upside down.

[0015] Thereby, the bracket for mounting the bracket (3)
(2) The mounting posture with respect to is determined, so that the mounting work is facilitated and the displacement after mounting can be prevented. The reason why the sizes (widths) of the mounting pieces (24) and (25) are different is that it is possible to tighten the driver from one side. A long hole (32) is formed in the nozzle mounting plate (31) of the bracket (3). This long hole (32) is a small circular arc part (33) with a semicircular upper part
The lower hole is a long hole in which a large arc portion (34) having a larger diameter is formed. In addition, small arc part (33)
An open portion having a width corresponding to the diameter of the small arc portion (33) is formed between the small arc portion and the large arc portion (34).

On both sides of the center of the small arc portion (33), through holes (38) (38) for mounting a nozzle (4) described later are formed. The nozzle (4) is, as shown in FIGS. 3 and 6,
Screw holes (43) from the base end of the cylinder having a nozzle hole at the tip
(43) in the form of having a mounting flange (41) formed,
An insertion opening (42) having a constant depth set to be larger than the inner diameter of the cylindrical body is formed at the base end.

The distal end (downstream end) of the thin metal tube (5) is inserted and connected to the insertion opening (42). The leading end of the thin metal tube (5) is located at a predetermined distance from the distal end. (51) is formed. The inner diameter of the insertion port (42) is larger than the outer diameter of the cording part (51), and the dimension from the cording part (51) to the tip is larger than the depth of the insertion port (42). In addition, the diameter of the distal end tubular portion (52) on the distal side of the cording portion (51) is set to be slightly smaller than the inner diameter of the tubular portion that continues to the back of the insertion opening (42). doing.

The small arc portion (33) in the long hole (32)
Is set to such a diameter that the thin-walled metal tube (5) is just inserted, and the diameter of the large arc portion (34) is set to a diameter that allows the cording portion (51) to be inserted. Also, the tip tube
An O-ring as a seal packing (P) is externally fitted to (52), and when the distal end of the thin-walled metal tube (5) in this state is inserted into the insertion opening (42), the seal packing is inserted. By (P), airtightness between the distal end tubular portion (52) and the insertion opening (42) is ensured.

In the case of the nozzle mounting structure of this embodiment, a mounting bracket (2) is previously connected to the mixing pipe (B), and a bracket is mounted.
(3) and the nozzle (4) are pre-assembled with the thin metal tube (5) connected. The nozzle (4) has a mounting flange (41) attached from the inside of the nozzle mounting plate (31),
The mounting screws penetrating the through holes (38) (38) from the outer surface side of the nozzle mounting plate (31) are screwed into the screw holes (43) (43) and screwed.

In this case, prior to the screwing, the distal end of the thin-walled metal tube (5) having the O-ring fitted to the distal end tubular portion (52) is removed from the large arc portion (34) of the long hole (32). A threading part (51) is inserted through the inner surface of the nozzle mounting plate (31), and the nozzle (4) is fitted over the tip part. In this state, the threading part (5) of the thin metal tube (5) is inserted. It is moved so that the vicinity of 51) coincides with the small arc portion (33).

As a result, the stringing portion (51) is engaged with the elongated hole (32) in a retaining state, and the stringing portion (51) and the O-ring as the seal packing (P) are inserted into the insertion opening (42). ). The depth of the insertion opening (42) is made substantially equal to the sum of the diameter of the O-ring as the seal packing (P) and the width of the cording portion (51) in the axial direction. Then, when the mounting flange (41) is screwed in a state of being attached to the inner surface of the nozzle mounting plate (31), the stringing portion (51) and the sealing packing (P) are inserted into the insertion opening (42). The distal end tubular portion (52) is closely fitted in the inner periphery of the tubular body portion at the back of the insertion opening (42). Therefore, the distal end of the thin metal tube (5) is held in the space between the insertion opening (42) and the nozzle mounting plate (31) in a movement-blocking state, and the thin metal tube (5) and the nozzle (4) are not moved. 3) The connection portion is securely fixed and airtightness is sufficiently ensured.

[Brief description of the drawings]

FIG. 1 is a sectional view of an essential part of an embodiment of the present invention as viewed from the side.

FIG. 2 is a sectional view of a main part viewed from the rear.

FIG. 3 is a sectional view of a main part viewed from above.

FIG. 4 is a front view of the relay board (2b).

FIG. 5 is a perspective view of a bracket (3).

FIG. 6 is a front view of the nozzle (4).

[Explanation of symbols]

(B) ・ ・ ・ Mixing tube (B ₁ ) ・ ・ ・ Mouth (2) ・ ・ ・ Mounting bracket (21) ・ ・ ・ Wall surface (22) ・ ・ ・ Opening (31) ・ ・ ・ Nozzle mounting plate (32 ) ・ ・ ・ Long hole (33) ・ ・ ・ Small arc (34) ・ ・ ・ Large arc (4) ・ ・ ・ Nozzle (41) ・ ・ ・ Mounting flange (5) ・ ・ ・ Thin metal pipe (42 ) ・ ・ ・ Insertion port (51) ・ ・ ・ Ring-out part (52) ・ ・ ・ Tip end (P) ・ ・ ・ Seal packing

──────────────────────────────────────────────────続 き Continued on the front page (58) Fields surveyed (Int.Cl. ⁶ , DB name) F23D 14/48 F23D 14/64 F23D 14/02-14/08

Claims (1)

(57) [Claims] 1. A nozzle fixing structure in which a mounting bracket is connected to a mixing pipe of a gas burner and the nozzle is fixed coaxially to the mixing pipe by a bracket mounted thereon. A mounting bracket (2) connected to (B) is a partially open box made of a metal plate, and a wall (21) of the box facing the mouth (B ₁ ) of the mixing pipe (B). A bracket (3) having a U-shaped cross section and a nozzle mounting plate (31) parallel to the wall surface (21) is detachably screwed to the wall surface (21). A gourd-shaped long hole (32) is formed in the nozzle mounting plate (31).
(32) is a small arc portion located coaxially with respect to the mouth (B ₁ ).
(33) and a large arc portion (34) deviating therefrom, and the nozzle (4) is attached to the inner surface of the nozzle mounting plate (31) and is concentric with the small arc portion (33). An insertion opening (42) for inserting the end of the thin metal tube (5) is formed at the entrance side, and a mounting flange (41) for screwing the
At the position away from the tip of the thin metal tube (5),
1), the insertion opening (42) is large enough to insert the cording portion (51), and the large arc portion of the long hole (32) is formed.
(34) is set to a size that allows the cording part (51) to be inserted,
Further, the size of the small arc portion (33) is made substantially equal to the diameter of the thin metal tube (5), and the tip end cylindrical portion (52) on the tip side of the unraveling portion (51) in the thin metal tube (5). Fixing structure of nozzle with sealing gasket (P) press-fit between it and insertion port (42).