JP4300284B2 - Structure of mounting part such as flame detection rod - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a structure of a mounting portion such as a flame detection rod in a burner used for drying paper, cloth and the like, and heating various items such as food, metal materials, and wood.
[0002]
[Prior art]
An infrared burner having a combustion plate is widely used for drying paper, cloth and the like, and heating various items such as food, metal materials, and wood. In this type of burner, a flange is provided at the peripheral edge of the combustion plate, and a flame detection rod for detecting the disappearance of the flame and an ignition rod for igniting the burner are exposed to the combustion plate. It is not provided.
[0003]
The flame detection rod detects a flame by the rectifying action of the ion electrode, and the ignition rod ignites a gas by an electric spark. Therefore, all of the mounting portions maintain an electrically insulated state. There is a need. For this reason, the mounting portion of the rod has a structure in which a ceramic holder having insulating properties and heat resistance is fixed to the burner body, and the rod is held by the holder. Since it is difficult to process, it could not be formed into a complicated shape such as a shape having a fixing flange. Further, even if it can be molded into a desired complicated shape, it is not suitable for long-term use because it is brittle in material and easily damaged.
[0004]
[Problems to be solved by the invention]
Therefore, the present invention has an object to provide a holding structure that can be securely fixed with a relatively simple structure by improving a method for attaching a flame detection rod, an ignition rod, and the like in the conventional burner.
[0005]
[Means for Solving the Problems]
In order to solve the above problems, the present invention employs the following configuration. That is, the structure of the mounting portion of the flame detection rod or the like according to the present invention is the structure of the mounting portion of the flame detection rod or the like in a burner in which a combustion plate is mounted on the front surface and a flange portion is provided on the peripheral edge thereof. A ceramic holder provided with a large-diameter head and a small-diameter barrel, a through-hole for inserting a rod in its core, and a circumferential cut in the middle of the barrel; A plate-shaped presser provided with an insertion hole through which the barrel portion of the holder is inserted and a screw hole for tightening, and a notch that fits into the notch of the holder from one end toward the center. Using a plate-like spacer and a screw that is screwed into a screw hole of the presser, and providing a mounting hole of a size that the body portion of the holder is inserted into the flange portion of the burner and the head portion is not inserted, Insert the holder body into the mounting hole A spacer is fitted from the side to the notch of the body portion of the holder, the presser is overlapped with the spacer from the front side, and the screw is screwed into the screw hole, and the tip of the screw The contact portion is brought into contact with the back side of the flange and tightened to cause a reaction force to act on the barrel portion of the holder via the spacer, and the head of the holder is pressed against the front surface side of the flange to attach the holder to the flange. It is characterized in that it is fixed and a rod is inserted and held in the through hole.
[0006]
The structure of the attachment portion of the flame detection rod or the like (flame detection rod, ignition rod) of the present invention includes a large-diameter head and a small-diameter trunk as a ceramic holder, and the trunk is provided with a notch. Since a simple shape can be used, molding is easy and there is no problem in strength. Further, the spacer fitted from the side to the notch of the holder is pressed by a pressing tool, and the tip of the screw screwed to the pressing tool is brought into contact with the flange of the burner body and tightened. Since the force is applied to the notch and the head of the holder is pressed against the front surface of the flange and fixed, the holder can be easily and firmly attached.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings. The figure shows an embodiment of the present invention. The infrared burner 1 is made of a thin steel plate formed as a long rectangular box (may be other shapes such as a cube, polygon, cylinder, etc.). A burner body 1a is provided, and a front surface portion of the burner body is open, and a combustion plate 3 made of a porous ceramic material is attached to the opening. The burner main body 1a is partitioned at predetermined intervals by partition plates 4,..., And a plurality of (or even one) combustion plates 3 are attached to each section. P in the figure is a heat insulating material (kao wool). A flange 1b projecting outward is integrally formed on the periphery of the opening of the burner body 1a.
[0008]
A square cylindrical first mixed gas chamber 2 is attached to the back surface of the burner body 1a. That is, threaded bosses 5 are welded to the bottom of the burner body 1a and the front surface of the first mixed gas chamber 2 at predetermined intervals, and the burner body 1a and the first mixed gas chamber 2 are connected to each other by the threaded bosses 5,. It is fixed. The threaded boss 5 is closed at the front end, and a cap-like nozzle 8 having a plurality of through holes (orifices) 8a,...
[0009]
The inside of the burner body 1 a is a second mixed gas chamber 10. The second mixed gas chamber 10 is divided into a front chamber 10a and a rear chamber 10b by a partition wall 12 provided with a large number of through holes. A front end portion of the front chamber 10a is covered with the combustion plate 3, and the nozzle 8 projects into the rear chamber 10b. The outer peripheral portion of the nozzle 8 is surrounded by a cylindrical cover 14 made of a perforated plate, and the front end portion of the cylindrical cover 14 is covered by a disc 15 having no through hole.
[0010]
A lower threaded boss 20 is fixed by welding at a position facing the threaded boss 5 at the bottom of the first mixed gas chamber 2, and a needle valve holder 22 is screwed to the threaded boss. This needle valve holder is provided with a screw hole 23 communicating in the front-rear direction (up and down in FIGS. 1 and 2), and a shaft portion of the needle valve 25 is screwed into the screw hole. The front end portion of the needle valve 25 is integrally provided with a frustoconical head portion 25 a that faces the inner surface of the nozzle 8. The supply amount of the mixed gas is adjusted by the size of the gap t between the inclined surface of the head portion 25a of the needle valve 25 and the inner edge of the lower end portion of the nozzle 8. The needle valve 25 is provided with a driver engaging groove 25b at the rear end of the shaft portion thereof, and the needle valve is advanced and retracted by turning the needle valve with a screwdriver engaged therewith. The gap t can be adjusted. The rear part of the needle valve 25 is covered with a cap 27 screwed onto the needle valve support member 22.
[0011]
One set of the valve unit 30 including the combination of the nozzle 8 and the needle valve 25 is provided for each section of the burner body partitioned by the partition plate 4. Further, a supply port 33 for supplying the mixed gas to the first mixed gas chamber 2 is provided in the interval portion of these valve units.
[0012]
Next, the infrared burner 1 is provided with a cooling air chamber 40. The cooling air chamber 40 has an opening at the front and an inner surface of the second box 45 having a flange 45a formed at the periphery thereof, and a burner body 1a (illustrated example) fitted in the second box 45. Then, it is formed as a space formed between the burner body 1a and the first mixed gas chamber 2). The flange of the burner body 1a and the flange 45a of the second box 45 overlap in the front-rear direction, and square plate-like spacers 46,. A gap between both flanges formed by the spacer serves as a cooling air flow passage.
[0013]
The first mixed gas chamber 2 is filled with a mixed gas of fuel gas and air fed from an inflow port 33 provided on the back surface portion. The mixed gas is supplied to the second mixed gas chamber 10 from a plurality of nozzles 8 provided at regular intervals in the first mixed gas chamber 2 and the second mixed gas chamber 10. That is, the mixed gas supplied into the first mixed gas chamber 2 flows into the nozzle 8 through the gap between the head 25a of the needle valve 25 of the valve unit 30 and the lower end inner edge of the nozzle 8, and the orifice 8a. , ... are discharged sideways. The discharged mixed gas is supplied to the rear chamber 10 b of the second mixed gas chamber 10 through a through hole provided in the outer peripheral portion of the cylindrical cover 14. Since the front end portion of the cylindrical cover 14 is covered with a disc 15 which is a baffle plate, the cylindrical cover 14 is not supplied directly forward but is supplied in a distributed manner to the side.
[0014]
The mixed gas supplied into the rear chamber 10b is uniformly supplied to the rear surface of the combustion plate in the front chamber 10a through the through holes of the partition wall 12 made of a perforated plate. This mixed gas reaches the plate surface through a large number of pores of the combustion plate 3, burns in the vicinity of the surface, and makes the combustion plate 3 red hot. The object near the front surface of the infrared burner is heated by the radiant heat of the red hot combustion plate 3.
[0015]
On the other hand, the cooling air chamber 40 is supplied with cooling air from an air supply port 47 provided on the back surface of the second box 45. The cooling air flows out through the gap between the overlapping flanges 1b and 45a while cooling the back surface and the outer periphery of the burner body 1a. In the illustrated burner, the outer edges of the flanges 1b and 45a are bent backward, so that the cooling air that flows out is discharged backward, and the heated object on the front surface of the burner is shaken. Does not adversely affect the cooling.
[0016]
Next, the infrared burner 1 is provided with a flame detection rod 50 for detecting the flame of the combustion plate and an ignition rod 60 for igniting the burner. Both the flame detection rod 50 and the ignition rod 60 are held by a ceramic holder 70 and attached to the burner body 1a with the same structure. The mounting structure will be described below.
[0017]
As shown in FIG. 8, the holder 70 is integrally formed with a large-diameter head 73 at the tip of a cylindrical body 72. The head portion 73 has a shape having flat surfaces 73a and 73a in which a cylinder having a diameter larger than the diameter of the body portion 72 is cut in a straight line symmetrically across the center point. A rod insertion hole 75 is formed in the core of the holder, and the upper end of the hole 75 communicates with a groove 75 a formed in the radial direction of the head 73. Further, a circumferential incision 77 is provided in the body portion of the holder 70 so as to be cut from the left and right outer peripheral surfaces toward the central portion at right angles to the axial direction.
[0018]
On the other hand, the flange 1b of the burner body is provided with a pair of holes 79, 79 through which the barrel portion of the holder is inserted. A pair of bases 80, 80 are fixed to the surface side of the mounting portion with screws 81,. These bases 80 and 80 are for attaching a flame detection rod and an ignition rod, and are structurally the same. As shown in FIG. 7, the base 80 is formed by superposing upper and lower substrates 80a and 80b. An upper substrate 80a has a rising portion 82 and a generally U-shaped guard 83 protruding from the rising portion toward the combustion plate. Are provided integrally. The guard 83 also serves as an electrode of a rectifying ion electrode flame detector described later. A hole 84 for inserting a holder is formed in the center of the base 80 at a position overlapping the hole 79 on the flange side. The flat surfaces 73a and 73a of the head of the holder 70 are sandwiched by the guard 83 which is a member fixed to the burner, and the rotation around the axis is restricted.
[0019]
A pair of left and right spacers 85 and 85 and a presser 90 are attached to the notch 77 portion of the holder 70. In the spacer 85, a cut 85a is formed from one end portion to the center portion of the square plate, and a hole 85b through which a fixing screw is inserted is formed in the vicinity of the opposite end portion. The back end portion of the cut 85a is formed in a semicircular shape, and the cut portion of the holder is fitted into the cut 85a.
[0020]
As shown in FIG. 9, the presser 90 is formed in a groove shape obtained by bending the end edges 90a, 90a in the longitudinal direction of a rectangular plate at a right angle, and the barrel portion of the holder is inserted in the center thereof. A fitting hole 91 is provided, and screw holes 92, 92 are provided in the vicinity of both ends in the longitudinal direction. The portion of the screw hole protrudes in a cylindrical shape.
[0021]
The flame detection rod 50 and the ignition rod 60 include a threaded base 50a (60a), a bent portion 50b (50b) bent substantially at a right angle, a slightly inclined portion 50c (60c), and a pointed tip 50d. It is formed in a bent shape having (60d). The flame detection rod 50 and the guard 83 (also serving as an electrode) constitute a rectifying electrode flame detector.
[0022]
Next, the assembly of this holding structure will be described taking the flame detection rod 50 as an example. First, the hole 84 of the base 80 is aligned with the mounting hole 79 provided in the flange 1b of the burner body, and fixed with screws 81,81. Next, the small diameter body 72 of the holder 70 is inserted into the hole 79 and the base hole 84, and the notches 85a and 85a of the pair of left and right spacers 85 and 85 are fitted into the notches 77, respectively. At this time, the body 72a thinned by the notch 77 is fitted into the notch 85a of the spacer 85, and the both spacers overlap each other.
[0023]
Further, the body portion 72 of the holder 70 is fitted into the fitting hole 91 of the presser 90 so that the presser 90 is overlapped with the spacers 85, 85. In this state, screws are screwed into the screw holes 92, 92 of the presser 90, and the leading end portions of the screws are inserted into the holes 85b, 85b of the spacers 85, 85 to tighten the screws 99, 99. Then, the tips of the screws 99, 99 come into contact with the back surface of the flange 1b (actually, the back surface of the flange 45a) and do not advance any further, so that the presser 90 moves downward in FIGS. , 85 are pressed against the stepped portion of the notch 77 of the holder 70 to stop. For this reason, the downward force of the figure acts on the holder 70, and the stepped portion of the head 73 is firmly fixed in a state where it is pressed against the flange 1b of the burner body via the base 80.
[0024]
When the holder 70 is fixed to the burner main body in this way, the flame detection rod 50 or the ignition rod 60 is inserted into the holder, and a terminal 98 is attached to the base and wired. It should be noted that the bent portion 50b (60b) of the flame detection rod 50 and the ignition rod 60 is in a state in which the rotation around its axis is restricted by fitting into the groove 75a in the radial direction of the holder, and its sharp tip 50d. (60d) is held so as to face the curved portion of the guard 83.
[0025]
The structure of the mounting portion such as the flame detection rod is such that a spacer 70 is provided with a large-diameter head portion 73 and a small-diameter barrel portion 72 in the holder 70, and a notch is made in the barrel portion. And the flange 1b (45a) are made to react with each other by a screw to press and fix the stepped portion of the head of the holder against the flange, so that the holder can be formed in a relatively simple structure. Not only is it easy to manufacture, but there are few accidents such as damage. Further, the holder can be firmly fixed by a simple operation. Furthermore, since the holder 70, the flame detection rod, the ignition rod, etc. are fixed in a state where the rotation and lateral blurring around the shaft are restricted, it is possible to prevent these rods from contacting other members of the burner. Good insulation is maintained and normal operation is ensured.
[0026]
【The invention's effect】
As described above, according to the present invention, it is possible to reduce the cost by using a simple holder, and it is possible to securely fix the flame detection rod and the ignition rod with a simple operation. It was.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing an example of an infrared burner of the present invention.
FIG. 2 is a cross-sectional view of an infrared burner.
FIG. 3 is a front view showing a part of the infrared burner by a fracture surface.
FIG. 4 is a front view (a) and a side view (b) showing the appearance of an infrared burner.
FIG. 5 is a side view of the infrared burner in the longitudinal direction.
FIG. 6 is a plan view (a) and a side view (b) of a flame detection rod and an ignition rod.
FIG. 7 is a plan view (a), a side view (b), and a rear view (c) of the base.
FIG. 8 is a plan view (a), a longitudinal sectional view (b), and a front view (c) of the holder.
FIG. 9 is a plan view (a) a front view (b) and a cross-sectional view (c) of the presser.
FIG. 10 is a plan view (a) and a front view (b) of a spacer.
FIG. 11 is a plan view of a rod mounting portion.
FIG. 12 is a front sectional view of a rod mounting portion.
FIG. 13 is a side cross-sectional view of a rod attachment portion.
FIG. 14 is a bottom view of the presser.
[Explanation of symbols]
1 Infrared burner 1a Burner body 1b Flange 2 First mixed gas chamber 3 Combustion plate 8 Nozzle 10 Second mixed gas chamber 25 Needle valve 30 Valve unit 40 Cooling air chamber 50 Flame detection rod 60 Ignition rod 70 Holder 80 Base 85 Spacer 90 Presser

Claims (3)

Combustion plate is attached to the front, and the peripheral part is a structure of a mounting part such as a flame detection rod in a burner provided with a flange part, which has a large-diameter head and a small-diameter body, and its core part A ceramic holder in which a through hole for inserting a rod is provided, a circumferential cut is provided in an intermediate portion of the body portion, an insertion hole through which the body portion of the holder is inserted, and a screw hole for fastening A plate-like presser provided with a plate, a plate-like spacer formed with a notch that fits into the notch of the holder from one end toward the center, and a screw hole of the presser Using a screw, a mounting hole having a size in which the body portion of the holder is inserted into the flange portion of the burner and the head portion is not inserted is inserted, and the body portion of the holder is inserted into the mounting hole from the front side. Fit the spacer from the side to the notch of the body In addition, the presser is overlapped with the spacer from the front side, the screw is screwed into the screw hole, and the tip of the screw is brought into contact with the back side of the flange to tighten the spacer. A reaction force is applied to the body of the holder, the head of the holder is pressed against the surface side of the flange to fix the holder to the flange, and a rod is inserted and held in the through hole. The structure of the mounting part such as a flame detection rod. The holder head has a plane in which a cylinder having a diameter larger than the diameter of the body section is cut in a straight line symmetrically across the center point, and the plane is clamped by a member fixed to the burner. The structure of an attachment portion such as a flame detection rod according to claim 1, wherein the rotation of the holder around its axis is restricted. The base of a rod such as a flame detection rod is inserted into the through hole of the holder, and the bent tip of the rod is fitted into a radial groove provided in the head of the holder, thereby rotating the rod around its axis. The structure of an attachment part such as a flame detection rod according to claim 1 or 2, wherein the movement is restricted.

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