JP7349928B2 - Boosters for burners and dishwashers - Google Patents

Description

The present invention relates to a burner that is a single-ended radiant tube burner with a surface combustion element, and to a booster for a dishwasher.

The so-called single-end radiant tube burner described in the present invention, as described in Patent Document 1, is composed of an inner cylinder and an outer cylinder positioned coaxially with the inner cylinder and having one end closed. This is a burner that heats the outer cylinder with the combustion exhaust gas generated by burning the all-primary premixed gas flowing in the inner cylinder, and heats the gas or liquid in contact with the outer cylinder. The combustion exhaust gas that has heated the outer cylinder is discharged to the outside through a combustion exhaust gas flow path formed between the inner cylinder and the outer cylinder.

A conventional single-end radiant tube burner burns gas together with primary air using a Bunsen burner inside an inner cylinder. In recent years, instead of Bunsen burners, metal knit burners using metal knit woven with metal fibers that are surface combustion members, as described in Patent Document 2, and combinations of many metal fibers that are also surface combustion members have been developed. A metal fiber burner (hereinafter, metal knit burners and metal fiber burners are collectively referred to as "burners using surface combustion members") that uses woven metal fibers is installed inside the cylinder, and the entire primary premixed gas is A known technique is one in which combustion is caused by passing through a surface combustion member.

By replacing the burner that burns inside the inner cylinder of a single-end radiant tube burner from a Bunsen burner to a burner that uses a surface combustion member, we suppress misfires caused by lifts and damage and burnout of the devices that make up the burner, etc. due to backing up. can do.

In addition, compared to conventional heat exchangers that flow the flue gas generated by the burner into the pipes and heat what comes into contact with the outside of the pipes, single-end radiant tube burners have higher heat exchange efficiency. is known to exhibit. This allows the single-end radiant tube burner to have a smaller configuration even if the burner has the same heat exchange efficiency.

Furthermore, by changing the combustion load, burners using surface combustion members can be set to red-hot mode in which the surface of the surface combustion member is heated to red heat and burned, and burners in which a blue flame is raised on the surface of the combustion member and combusted. It is possible to obtain a larger turndown ratio compared to a Bunsen burner by using the blue frame mode.

Japanese Patent Application Publication No. 2018-162935 Japanese Patent Application Publication No. 2000-337613

However, in a single-end radiant tube burner in which the burner installed inside the tube is replaced with a burner using a surface combustion member as described in Patent Document 2, there is no direct connection between the outer tube and the inner tube at the tip. The structure makes it easy for premixed gas to accumulate.

Therefore, if the spark is not positioned appropriately with respect to the surface combustion member, the all-primary premixed gas ejected from the surface-combustion member will not be ignited, and the all-primary premixed gas will accumulate at its tip. Then, all of the accumulated primary premixed gas ignites, causing a small explosion. This small explosion is a phenomenon called explosive adhesion.

Although it is possible to ignite all the primary premixed gas ejected from the surface combustion member with explosive bonding, explosive bonding has the problem of emitting a loud sound and the small explosion causing damage to the internal structure of the single-end radiant tube burner. There was a risk that it would be destroyed.

The present invention is capable of suppressing the occurrence of explosions in a single-end radiant tube burner, and quickly adjusting the temperature of water stored in a tank provided in a dishwasher to a temperature suitable for washing dishes. The purpose is to provide a booster for burners and dishwashers that can.

In order to achieve the above object, the burner according to the present invention includes:
It is composed of an inner cylinder and an outer cylinder positioned coaxially with the inner cylinder, and the outer cylinder is heated with combustion exhaust gas generated by burning all the primary premixed gas flowing in the inner cylinder. , a burner that is a single-end radiant tube burner that discharges the combustion exhaust gas to the outside through a combustion exhaust gas flow path formed between the inner cylinder and the outer cylinder,
a surface combustion member that is provided so as to cover the tip of the inner cylinder, and allows all primary premixed gas flowing in the inner cylinder to pass therethrough and burn it on the surface;
a spark rod that is partially covered with an insulator except for both ends inside the inner cylinder and is provided so as to penetrate the surface combustion member;
a mounting cylinder fixed inside the inner cylinder so as to be coaxial with the inner cylinder;
a protection tube having a fitting for coaxially attaching the spark rod to the attachment tube, and having an open end penetrating the surface combustion member;
a first gas flow path formed between the inner cylinder and the protection cylinder through which all primary premixed gas flows;
a second gas flow path through which the all-primary premixed gas flows, which is formed in a gap between the protection tube and an insulator fixed in the protection tube;
a ground rod that generates a spark between the spark rod and the spark rod;
Equipped with
A hole is made in the protective tube between a position where the protective tube penetrates the surface combustion member fixed to the inner tube and a fitting for coaxially attaching the spark rod to the mounting tube, and the While communicating the first gas flow path and the second gas flow path,
The spark rod is bent, and the spark generated between the spark rod and the ground rod is located at a position immediately after all the primary premixed gas is ejected from the surface combustion member. It is.

Further, the dishwasher booster according to the present invention includes:
The present invention is characterized in that a burner is attached to a dishwasher to heat washing water stored in a tank of the dishwasher.

According to the burner and dishwasher booster of the present invention, it is possible to suppress the occurrence of explosion in a single-end radiant tube burner, and to adjust the temperature of water stored in a tank provided in a dishwasher to can be quickly adjusted to the appropriate temperature.

1 is a schematic side view of a dishwasher in which a burner according to an embodiment of the present invention is attached to a tank as a booster for the dishwasher. FIG. 2 is a schematic side cross-sectional view of the burner of the present invention. FIG. 3 is an enlarged partial cross-sectional view of the tip portion of the burner. FIG. 3 is an enlarged partial cross-sectional view showing a different configuration of the burner. FIG. 7 is an enlarged partial cross-sectional view showing a further different configuration of the burner.

The burner of the present invention is
It is composed of an inner cylinder and an outer cylinder positioned coaxially with the inner cylinder, and the outer cylinder is heated with combustion exhaust gas generated by burning all the primary premixed gas flowing in the inner cylinder. , a burner that is a single-end radiant tube burner that discharges the combustion exhaust gas to the outside through a combustion exhaust gas flow path formed between the inner cylinder and the outer cylinder,
a surface combustion member that is provided so as to cover the tip of the inner cylinder, and allows all primary premixed gas flowing in the inner cylinder to pass therethrough and burn it on the surface;
a spark rod that is partially covered with an insulator except for both ends inside the inner cylinder and is provided so as to penetrate the surface combustion member;
a mounting cylinder fixed inside the inner cylinder so as to be coaxial with the inner cylinder;
a protection tube having a fitting for coaxially attaching the spark rod to the attachment tube, and having an open end penetrating the surface combustion member;
a first gas flow path formed between the inner cylinder and the protection cylinder through which all primary premixed gas flows;
a second gas flow path through which the all-primary premixed gas flows, which is formed in a gap between the protection tube and an insulator fixed in the protection tube;
a ground rod that generates a spark between the spark rod and the spark rod;
Equipped with
A hole is made in the protective tube between a position where the protective tube penetrates the surface combustion member fixed to the inner tube and a fitting for coaxially attaching the spark rod to the mounting tube, and the While communicating the first gas flow path and the second gas flow path,
The spark rod is bent, and the spark generated between the spark rod and the ground rod is located at a position immediately after all the primary premixed gas is ejected from the surface combustion member. It is.

According to this burner, it is possible to suppress the occurrence of explosive adhesion, thereby suppressing the occurrence of a loud noise during ignition and the damage to the members within the burner due to explosion adhesion.

In addition, the burner structure can be made smaller and more compact.

In addition, even if all the primary premixed gas ejected from the surface combustion member is not ignited, all the primary premixed gas ejected through the second gas flow path can be ignited, and all the primary premixed gas ejected through the second gas flow path can be ignited. By suppressing mis-ignition of the mixed gas, it is possible to suppress the occurrence of explosions.

Further, the opening at the tip of the inner cylinder through which all the primary premixed gas is ejected through the first gas flow path is referred to as a first flame port;
The opening of the protective cylinder through which all the primary premixed gas is ejected through the second gas flow path is used as a second flame port,
The cross-sectional area of the first flame port is larger than the cross-sectional area of the second flame port.
It is characterized by this.

In addition, a surface combustion member was attached to cover the hole in the protective cylinder that communicated the first gas flow path and the second gas flow path.
It is characterized by this.

This not only changes the flow rate of the total primary premixed gas, but also prevents damage and burnout of the device constituting the burner etc. due to bagging, due to the surface combustion member attached to cover the hole.

Further, the booster for a dishwasher of the present invention is characterized in that any one of the burners described above is attached to a dishwasher, and wash water stored in a tank of the dishwasher is heated.

Thereby, it is possible to provide a booster for a dishwasher that can quickly adjust the temperature of water stored in a tank to a temperature suitable for washing dishes while suppressing the occurrence of explosive adhesion.

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(Embodiment 1)
(About dishwashers)
First, a description will be given of a dishwasher in which the burner of the present invention is attached to a tank as a dishwasher booster for heating washing water.

Generally, facilities such as company cafeterias and school lunch centers where large quantities of food are consumed are often equipped with dishwashers that can continuously wash dishes after eating.

As shown in FIG. 1, such a dishwasher 1 uses a pump 11 to suck in washing water 14 stored in a tank 10 within a cover 2 formed of a steel plate, and discharges it to a pipe 12, thereby discharging it into a washing chamber 4. The liquid is injected from the nozzle 13 attached to the pipe 12. The dishes 15 to be washed are transported by a transport means 3 provided in the dishwasher 1, such as a conveyor, and are washed with washing water 14 sprayed from a nozzle 13. Then, the washing water 14 used to wash the tableware 15 falls back into the tank 10 and is circulated and used.

The tableware 15 used for eating has a complex stain that is a combination of oil stains, protein stains, and starch stains. Therefore, the cleaning water 14 injected from the nozzle 13 is set at a predetermined temperature and a predetermined water pressure, such as a predetermined temperature and a predetermined water pressure, so that the complex dirt can be effectively washed away.

Grease stains can be dissolved and easily washed away by washing with washing water 14 at approximately 50 degrees Celsius or higher. Further, protein stains can be easily washed away by spraying the washing water 14 at a temperature of approximately 70 degrees Celsius or lower at a predetermined pressure, for example, at a pressure of approximately 0.05 MPa, so that the protein stains are not solidified by the high-temperature washing water 14. Starch stains can be easily washed away by spraying higher temperature cleaning water 14 at a predetermined pressure.

In order to effectively remove oil stains, protein stains, and starch stains, the cleaning water 14 stored in the tank 10 is heated to a predetermined temperature, for example, about 50 to 70 degrees Celsius, preferably about 50 to 60 degrees Celsius. Washing water 14 heated to a predetermined temperature while being held at 100° C. is sucked in by the pump 11 and discharged, and is sprayed from the nozzle 13 toward the tableware 15 at a predetermined pressure. In this way, the structure is such that complex stains adhering to the tableware 15 can be effectively washed away.

In a dishwasher 1 that washes dishes 15 with complex stains, the tank 10 is equipped with an electric dishwasher booster or the like in order to keep the washing water 14 stored in the tank 10 at a predetermined temperature. Alternatively, a dishwasher booster using a gas burner can be installed, but here we use a single-end radiant tube burner (hereinafter referred to as burner 20), which has a burner inside that uses a surface combustion member as a gas burner. ) is installed as a dishwasher booster.

In FIGS. 2 to 5, the front end side of the burner refers to the front end 30a (rightward in FIG. 2) side of the outer cylinder 30 of the burner 20, and the base end side of the burner refers to the front end side of the burner. The opposing (left direction in FIG. 2) side is shown.

(Burner configuration)
As shown in FIG. 2, the burner 20 attached to the tank 10 of the dishwasher 1 is roughly constituted by a double cylinder in which an outer cylinder 30 and an inner cylinder 40 are arranged coaxially.

Of the double cylinders, a flange 33 is provided on the outer cylinder 30 whose tip 30a side that contacts the cleaning water 14 stored in the tank 10 on the outside is closed, and the burner 20 is inserted into a hole drilled in the wall of the tank 10. The burner 20 is attached to the tank 10 by inserting the burner 20 so that the tip side is placed inside the tank 10 and fastening it with bolts, nuts, etc. so that the wall surface of the tank 10 and the flange 33 are in close contact with each other.

Note that the arrows in FIG. 2 indicate the flow direction of the total primary premixed gas G or the combustion exhaust gas H.

Of the double cylinders, an inner cylinder 40 is provided inside the outer cylinder 30 in which the entire primary premixed gas G flows. The inner cylinder 40 is fixed to the outer cylinder 30 at the base end side of the burner.

A combustion exhaust gas flow path 34 is formed between the outer cylinder 30 and the inner cylinder 40 to flow the combustion exhaust gas H obtained by combusting the total primary premixed gas G, and the combustion exhaust gas H that is caused to flow through the combustion exhaust gas flow path 34 is formed. An exhaust port 31 for exhausting air from the burner 20 is provided on the proximal end of the burner of the outer cylinder 30.

Inside the inner cylinder 40 , a mounting cylinder 32 to which a protection cylinder 50 is fixed coaxially is disposed so as to be coaxial with the inner cylinder 40 . The protection tube 50 is fixed to the burner tip end side of the attachment tube 32, and the attachment tube 32 is fixed to the inner tube 40 at the burner base end side. A female threaded fitting 32a is attached to the tip of the mounting tube 32 on the burner tip side. Then, the spark rod 60 to which the male threaded fitting 60a is attached is coaxially attached to the fitting 32a of the mounting tube 32.

The protection tube 50 is made of a material such as stainless steel, which has a predetermined outer radius R1, for example, approximately 8 mm, and which maintains mechanical strength even under relatively high temperature conditions. A spark rod 60 whose parts except both ends are covered with an insulator 65 is coaxially fixed. A gap is formed between the protective tube 50 and the insulator 65 covering the spark rod 60.

Further, the tip of the insulator 65 that covers the spark rod 60 on the burner tip side is configured to protrude by a predetermined distance L1, for example, about 7 mm, from the tip of the tip 50a of the protection tube 50. (See Figure 3).

A wiring 64 that leads to a high-voltage capacitor or the like for generating a spark between the spark rod 60 and the ground rod 70 is connected to the end of the spark rod 60 on the proximal end side of the burner.

In addition, although there is a gap between the ground rod 70 and the inner cylinder 40 in FIGS. 2 to 5, this is to clarify the shape of the ground rod 70 and the positional relationship between the gland rod 70 and the inner cylinder 40. This is a convenient expression to indicate. In reality, the ground rod 70 and the inner cylinder 40 are brought into close contact with each other and fixed by, for example, welding.

As shown in FIG. 2, a first gas flow path 45 is formed between the inner cylinder 40, the mounting cylinder 32, and the protection cylinder 50, and the end of the first gas flow path 45 on the burner tip side In this example, a surface combustion member 56, such as metal knit or metal fiber, is provided to cover the first gas flow path 45. The surface combustion member 56 is fixed to the tip 40a of the inner cylinder 40.

Further, an intake port 41 for sucking in the all-primary premixed gas G is provided on the base end side of the burner of the inner cylinder 40, and the all-primary premixed gas G taken in through the inlet port 41 flows into the first gas flow path 45. The fuel flows through the surface combustion member 56 and is ejected toward the tip of the burner.

As shown in FIG. 3, the tip of the tip 50a of the protective cylinder 50 is arranged to protrude through the surface combustion member 56, and the tip 40a of the inner tube 40 is directed toward the tip of the burner. It is configured to protrude by a predetermined distance, for example, 1 to 3 millimeters, from the tip.

A plurality of holes 51 having a predetermined diameter, for example, approximately 1.8 mm, are provided on the tip end 50a side of the protective tube 50, closer to the proximal end of the burner than the point where the surface combustion member 56 is penetrated. . The holes 51 allow the entire primary premixed gas G flowing in the first gas flow path 45 to flow into the second gas flow path 55, which is the gap formed between the protective cylinder 50 and the insulator 65, and further It communicates with the tip 50a so as to eject it toward the tip of the burner (see FIG. 2). Note that the number of holes 51 is not limited to a plurality, and may be one.

Note that the arrows in FIGS. 3 to 5 indicate the direction of the entire primary premixed gas G.

Here, the opening 40b of the inner cylinder 40 provided with the surface combustion member 56, which is the end of the first gas flow path 45 on the burner tip side, is defined as the first flame port 40c. The first flame port 40c is an area covered by the surface combustion member 56 in a direction perpendicular to the longitudinal direction of the inner cylinder 40, and is an area within the protection cylinder 50 arranged so as to penetrate the surface combustion member 56. is excluded.

Further, the opening 50b of the protective cylinder 50, which is the end of the second gas flow path 55 on the burner tip side, is defined as a second flame port 50c. The second flame port 50c extends in a direction perpendicular to the longitudinal direction of the protection tube 50, and extends within the opening 50b of the protection tube 50, excluding the area occupied by the spark rod 60 and the insulator 65.

Comparing the cross-sectional area of the first burner port 40c and the cross-sectional area of the second burner port 50c, the former is configured to be larger.

The end of the burner of the spark rod 60 that is not covered with the insulator 65 is connected to the end of the first spark rod (spark rod) 61 formed in a straight line and the second end formed in a bent manner. A male thread is cut at the end of a spark rod (spark rod) 62, and each end is connected to two female threads cut at a connecting member (spark rod) 63.

The first spark rod 61 and the second spark rod 62 are made of, for example, a heat-resistant alloy such as Kanthal (registered trademark) or SYTT (registered trademark). The connecting member 63 is made of, for example, stainless steel, which maintains its mechanical strength even at relatively high temperatures.

Describing the shape of the second spark rod 62 here, the second spark rod 62 moves from the point where it is connected to the connecting member 63 toward the tip end side of the burner, and then moves toward the tip end 70a of the ground rod 70. It is formed by bending towards the direction.

Further, the tip 62a of the second spark rod 62, which is the tip of the spark rod 60 here, indicates the part of the spark rod 60 that is closest to the tip 70a of the ground rod 70. In other words, if a part of the second spark rod 62 is closer to the tip 70a of the ground rod 70 than the tip 62a of the second spark rod 62, the part of the second spark rod 62 that is closer to the tip 70a is This is the tip 62a of the second spark rod 62.

Note that the configuration for connecting each of the first spark rod 61, second spark rod 62, and connection member 63 includes not only threading, but also a connection between the end of the first spark rod 61 and the second spark rod 62. It may also be configured such that the connecting member 63 is caulked so as to sandwich the end portions. In other words, any configuration can be applied as long as it provides essentially the same effect.

Since the first spark rod 61 and the second spark rod 62 are connected by the connecting member 63 in this way, in the unlikely event that the second spark rod 62 deteriorates due to oxidation etc. due to the heat of the flame, Even if the second spark rod 62 is damaged for some reason, the second spark rod 62 can be replaced, and maintainability can be improved.

3 and 4, the ends of the first spark rods (spark rods) 61, 81 and the ends of the second spark rods (spark rods) 62, 82 in the connecting members (spark rods) 63, 83 are shown in FIGS. Although there is a gap between the end portions, this is a convenient expression indicating that the first spark rods 61, 81 and the second spark rods 62, 82 are separate members.

Furthermore, in FIG. 5, the end of the first spark rod (spark rod) 91 and the end of the second spark rod (spark rod) 92 in the connecting member (spark rod) 93 are in close contact with each other. , a gap may be provided between the end of the first spark rod 91 and the end of the second spark rod 92.

Naturally, in order to generate a spark between the tips 62a, 82a, 92a of the second spark rods 62, 82, 92 and the tip 70a of the ground rod 70, the The end portions of the first spark rods 61, 81, 91 and the end portions of the second spark rods 62, 82, 92 are configured to be electrically connected. If the configuration is such that electricity is conducted, a gap may be provided between the ends of the first spark rods 61, 81, 91 and the second spark rods 62, 82, 92, for example. However, they may be placed in close contact. When a gap is provided, electricity flows from the first spark rods 61, 81, 91 to the second spark rods 62, 82, 92 via the connecting members 63, 83, 93.

Further, the tip 62a of the second spark rod 62 and the portion of the protection tube 50 closest to the tip 62a are spaced apart by a predetermined distance L2, for example, about 17 to 20 mm.

The tip 70a of the ground rod 70 and the tip 62a of the second spark rod 62 are spaced apart by a predetermined distance L3, for example, about 1 to 4 millimeters.

The tip 70a of the ground rod 70 fixed to the side surface of the tip 40a of the inner cylinder 40 is spaced from the surface combustion member 56 by a predetermined distance L4, for example approximately 6 to 9 mm, in the longitudinal direction of the inner cylinder 40. It is located in

The tip 62a of the second spark rod 62 is spaced apart from the surface combustion member 56 by a predetermined distance L5, for example approximately 9 to 11 mm, in the longitudinal direction of the inner cylinder 40.

Here, the relationship between the predetermined radius R1 and the predetermined distances L1 to L5 will be summarized.
(1) The radius of the outer diameter of the protection tube 50 is set to a predetermined radius R1.
(2) In the longitudinal direction of the inner cylinder 40, the tip of the insulator 65 on the burner tip side projects beyond the tip of the tip 50a of the protection tube 50 by a predetermined distance L1.
(3) The tip 62a of the second spark rod 62 and the portion of the protection tube 50 closest to the tip 62a are separated by a predetermined distance L2.
(4) The tip 70a of the ground rod 70 and the tip 62a of the second spark rod 62 are separated by a predetermined distance L3.
(5) In the longitudinal direction of the inner cylinder 40, the tip 70a of the ground rod 70 is spaced apart from the surface combustion member 56 by a predetermined distance L4.
(6) In the longitudinal direction of the inner cylinder 40, the tip 62a of the second spark rod 62 is spaced apart from the surface combustion member 56 by a predetermined distance L5.

These predetermined radius R1 and predetermined distances L1 to L5 are configured so that the following relationship holds true.
(A) The predetermined distance L1 is longer than the predetermined radius R1.
(B) The predetermined distance L2 is longer than the predetermined distance L3, the predetermined distance L4, and the predetermined distance L5.
(C) The predetermined distance L4 is longer than the predetermined distance L3. Moreover, the predetermined distance L5 is longer than the predetermined distance L3.

The relationships (A), (B), and (C) provide the following effects.
By preventing the spark generated from the tip 62a of the second spark rod 62 from reaching the protection tube 50 or the surface combustion member 56, the spark can be reliably delivered to the tip 70a of the ground rod 70. , it is possible to suppress ignition errors to the entire primary premixed gas G. In addition, the occurrence of explosive adhesion can be suppressed.

Note that although it is assumed that the relationship between the predetermined radius R1 and the predetermined distances L1 to L5 is maintained, the distances shown as examples of the predetermined radius R1 and the predetermined distances L1 to L5 are only examples, and the types of gas used Depending on the pressure and flow rate of the total primary premixed gas G taken in from the intake port 41, the shape of the exhaust port 31 and the intake port 41, the shape and length of the combustion exhaust gas flow path 34, the first gas flow path 45, etc. The predetermined radius R1 and the predetermined distances L1 to L5 may be changed as appropriate.

(Heating of cleaning water stored in a tank using a burner)
Next, the operation of heating the wash water 14 by the burner 20 attached to the tank 10 of the dishwasher 1 will be explained.

As shown in FIGS. 2 and 3, the entire primary premixed gas G taken in from the intake port 41 passes through the surface combustion member 56 provided at the first flame port 40c through the first gas flow path 45, Spouts out toward the tip of the burner. At the same time, the entire primary premixed gas G flows from the first gas flow path 45 to the second gas flow path 55 through the hole 51 provided in the protection tube 50, and flows from the second flame port 50c to the tip of the burner. It squirts to the side.

Then, the electricity flowing through the wiring 64 causes a spark to be generated between the second spark rod 62 and the ground rod 70. As a result, the entire primary premixed gas G ejected through the surface combustion member 56 or through the second gas flow path 55 flows from the second flame port 50c of the tip 50a of the protective cylinder 50 to the tip side of the burner. The entire primary premixed gas G that ejected is ignited.

At this time, in the structure of the present invention, the surface combustion member Since it is disposed at a position immediately after the all-primary premixed gas G is ejected from the surface combustion member 56, the all-primary premixed gas G ejected from the surface combustion member 56 can be immediately ignited. Thereby, it is possible to suppress the ignition error of the all primary premixed gas G that has passed through the surface combustion member 56, and to suppress the occurrence of explosion.

Furthermore, even in the unlikely event that the all primary premixed gas G ejected from the surface combustion member 56 is not ignited, the all primary premixed gas G ejected from the second flame port 50c can be immediately ignited. Mis-ignition of all the primary premixed gas G can be suppressed.

Also, when comparing the cross-sectional area of the first flame port 40c and the cross-sectional area of the second flame port 50c, the former is configured to be larger, so the flow of the first gas taken in from the intake port 41 is A large proportion of the total primary premixed gas G flowing through the passage 45 is passed through the surface combustion member 56, and the total primary premixed gas G immediately after passing is ignited, and the surface combustion member 56 is immediately ignited. can be burned on the surface of

This has the advantage of burners using surface combustion members, such as suppressing misfires due to lifts, damage and burnout of the burner components due to backing, and being able to obtain a larger turndown ratio compared to Bunsen burners. can be demonstrated.

The total primary premixed gas G ejected from the second flame port 50c to the tip side of the burner through the second gas flow path 55 is transferred to the surface of the surface combustion member 56 and from the second flame port 50c to the tip of the burner. It burns when it ejects to the side.

Then, the combusted primary premixed gas G generates a high-temperature combustion exhaust gas H, which heats the tip 30a of the outer cylinder 30, causing the gas and liquid that come into contact with the outside of the outer cylinder 30 to Wash water 14 stored in a tank 10 of a dishwasher 1 is heated by heat exchange.

The combustion exhaust gas H, whose temperature has been lowered by heating the outer cylinder 30 and exchanging heat with the washing water 14, flows through the combustion exhaust gas flow path 34 to the exhaust port 31, and is transferred to the facility where the dishwasher 1 is installed. It is exhausted to the outside of the facility through ducts, etc.

Note that if the all primary premixed gas G that has passed through the surface combustion member 56 provided at the first flame port 40c can be reliably ignited, the hole 51 may not be provided in the protective tube 50. In other words, all the primary premixed gas G flowing through the first gas flow path 45 may be injected from the first flame port 40c.

(Effect as a booster for dishwashers)
The effect when the burner 20 is attached to the tank 10 provided in the dishwasher 1 as a booster for the dishwasher will be explained.

When the washing water 14 is being sprayed towards the dishes 15 for washing in the washing chamber 4 of the dishwasher 1 shown in FIG. As a result, the temperature of the cleaning water 14 decreases.

Further, when the washing water 14 is jetted toward the dishes 15 that are continuously transported into the washing chamber 4 by the transport means 3 to wash the dishes 15, the dishes 15 carried out from the washing room 4 are washed with the washing water 15. It is transported out with a lot of dirt attached to it. As a result, the amount of washing water 14 stored in the tank 10 decreases each time the tableware 15 is washed. The reduced amount of cleaning water 14 is supplied to the tank 10 as water at room temperature, but since the supplied water is at room temperature, the temperature of the cleaning water 14 stored in the tank 10 drops. Furthermore, the temperature of the wash water 14 decreases due to heat radiation from the surface of the tank 10.

In this way, the temperature of the wash water 14 stored in the tank 10 provided in the dishwasher 1 tends to drop, making it difficult to maintain it at a predetermined temperature. However, in the dishwasher booster of the present invention, the cleaning water 14 stored in the tank 10 can be stably maintained at a predetermined temperature by taking advantage of the effects specific to the burner 20 described below.

For example, when the burner 20 is extinguished and the temperature of the cleaning water 14 stored in the tank 10 falls below a predetermined temperature, this is detected by a temperature sensor provided in the tank 10. By sending the detected electrical signal to a control panel or the like, the burner 20 can be ignited while suppressing ignition errors, and the cleaning water 14 stored in the tank 10 can be heated and maintained at a predetermined temperature.

Further, when the burner 20 is in the ignited state, if the temperature of the cleaning water 14 stored in the tank 10 is heated to a temperature higher than a predetermined temperature, it is detected by a temperature sensor provided in the tank 10. By sending the detected electrical signal to a control panel or the like, the burner 20 can be quickly extinguished and the cleaning water 14 stored in the tank 10 can be maintained at a predetermined temperature.

In this way, the temperature of the wash water 14 stored in the tank 10 can be quickly adjusted by repeatedly igniting and extinguishing the burner 20 with suppressed ignition errors. In addition, it is possible to suppress ignition errors during repeated ignition and extinguishing, and to suppress the occurrence of explosions each time ignition occurs.

Furthermore, since the turndown ratio of the burner 20 is large, it is possible to control the amount of heat given to the cleaning water 14 from the outer tube 30 while the burner 20 is burning, and the amount of heat given to the cleaning water 14 from the outer tube 30 can be controlled without the elapse of time due to repeated ignition and extinguishing. It is also possible to more accurately adjust the temperature of the cleaning water 14 in contact with the outside to a predetermined temperature.

In addition, control of the flow rate of all the primary premixed gas G to be taken into the burner 20, control of the air ratio of all the primary premixed gas G, etc. can be realized by using a known solenoid valve, mixer, etc. .

Furthermore, in the present invention, the burner 20, which is a single-end radiant tube burner that burns the entire primary premixed gas G on the surface of the surface combustion member 56, is attached to the tank 10 of the dishwasher 1 as a booster for the dishwasher. , the dishwasher booster attached to the tank 10 can be configured to be small, and the size of the dishwasher 1 can be made compact. Furthermore, it is possible to provide a booster for a dishwasher that can suppress misfires due to lifts and damage and burnout of devices constituting the burner 20 and the like due to backing up.

Note that a member that adjusts the flow of the total primary premixed gas G flowing into the hole 51, such as a surface combustion member, is pasted to cover the hole 51, and the gas flow path 55 is moved from the first gas flow path 45 to the second gas flow path 55. The flow rate of the total primary premixed gas G flowing to the primary premix gas G may be changed. This not only changes the flow rate of the total primary premixed gas G, but also prevents damage and burnout of the devices constituting the burner 20 etc. due to backing due to the surface combustion member attached to cover the hole 51. can.

As shown in FIG. 4, the end of the burner of the spark rod 80 that is not covered with the insulator 65 is connected to the end of the first spark rod 81 that is formed in a straight line. A configuration may also be adopted in which a male thread is cut in the end of the second spark rod 82 and connected in a bent state to two female threads cut in the connecting member 83, respectively.

As shown in FIG. 5, a through hole is provided in the longitudinal direction of the connecting member 93, and the first spark rod 91 formed linearly is passed through the through hole of the connecting member 93. A male thread cut at the end of the second spark rod 92 formed in a straight line may be connected in a bent state to a female thread cut in a plane substantially parallel to the second spark rod 92 . In this case, in order to prevent the connecting member 93 from falling off from the first spark rod 91, a female thread cut at the end of the second spark rod 92 is brought into contact with the first spark rod 91 within the connecting member 93. It is preferable to prevent it from coming off.

Note that the predetermined radius R1 and the predetermined distances L1 to L5 in FIGS. 4 and 5 indicate the same distances as the predetermined radius R1 and the predetermined distances L1 to L5 in FIG. 3.

Also, as shown in Figures 3 to 5, if the structure is such that electricity flows from the first spark rod to the second spark rod and sparks are generated from the tip of the second spark rod to the tip of the ground rod, then For example, the structure and shape of the spark rod, as well as the shape of the ground rod, are not limited to the configurations illustrated.

1 Dishwasher 2 Cover 3 Conveying means 4 Washing chamber 10 Tank 11 Pump 12 Piping 13 Nozzle 14 Washing water 15 Tableware 20 Burner (single-end radiant tube burner with a burner inside that uses a surface combustion member)
30 Outer tube 30a Tip 31 Exhaust port 32 Mounting tube 32a Fitting 33 Flange 34 Combustion exhaust gas flow path 40 Inner tube 40a Tip 40b Opening 40c First flame port 41 Intake port 45 First gas flow path 50 Protective tube 50a Tip part 50b Opening 50c Second flame port 51 Hole 55 Second gas flow path 56 Surface combustion member 60 Spark rod 60a Fitting 61 First spark rod (spark rod)
62 Second spark rod (spark rod)
62a Tip 63 Connection member (spark rod)
64 Wiring 65 Insulator 70 Ground rod 70a Tip 80 Spark rod 81 First spark rod (spark rod)
82 Second spark rod (spark rod)
82a Tip 83 Connection member (spark rod)
90 Spark rod 91 First spark rod (spark rod)
92 Second spark rod (spark rod)
92a Tip 93 Connection member (spark rod)
G Total primary premixed gas H Combustion exhaust gas

Claims (4)

It is composed of an inner cylinder and an outer cylinder positioned coaxially with the inner cylinder, and the outer cylinder is heated with combustion exhaust gas generated by burning all the primary premixed gas flowing in the inner cylinder. , a burner that is a single-end radiant tube burner that discharges the combustion exhaust gas to the outside through a combustion exhaust gas flow path formed between the inner cylinder and the outer cylinder,
a surface combustion member that is provided so as to cover the tip of the inner cylinder, and allows all primary premixed gas flowing in the inner cylinder to pass therethrough and burn it on the surface;
a spark rod that is partially covered with an insulator except for both ends inside the inner cylinder and is provided so as to penetrate the surface combustion member;
a mounting cylinder fixed inside the inner cylinder so as to be coaxial with the inner cylinder;
a protection tube having a fitting for coaxially attaching the spark rod to the attachment tube, and having an open end penetrating the surface combustion member;
a first gas flow path formed between the inner cylinder and the protection cylinder through which all primary premixed gas flows;
a second gas flow path through which the all-primary premixed gas flows, which is formed in a gap between the protection tube and an insulator fixed in the protection tube;
a ground rod that generates a spark between the spark rod and the spark rod;
Equipped with
A hole is made in the protective tube between a position where the protective tube penetrates the surface combustion member fixed to the inner tube and a fitting for coaxially attaching the spark rod to the mounting tube, and the While communicating the first gas flow path and the second gas flow path,
A burner characterized in that the spark rod is bent, and a spark generation position between the spark rod and the ground rod is located at a position immediately after all primary premixed gas is ejected from the surface combustion member. . The opening at the tip of the inner cylinder through which all the primary premixed gas is ejected through the first gas flow path is referred to as a first flame port;
The opening of the protective cylinder through which all the primary premixed gas is ejected through the second gas flow path is used as a second flame port,
The burner according to claim 1, wherein the cross-sectional area of the first burner port is larger than the cross-sectional area of the second burner port . The burner according to claim 1 or 2, characterized in that a surface combustion member is attached so as to cover a hole in a protective cylinder that communicates the first gas flow path and the second gas flow path. A booster for a dishwasher, characterized in that the burner according to any one of claims 1 to 3 is attached to a dishwasher to heat washing water stored in a tank of the dishwasher.

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