JP3279937B2 - Valve device for switching ventilation in regenerative burner - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ventilation switching valve device for switching the ventilation between combustion air and combustion exhaust gas in a regenerative burner.

[0002]

2. Description of the Related Art In a regenerative burner, a valve device for switching the ventilation between combustion air and combustion exhaust gas is constructed by combining a two-way valve or using a three-way valve. For example, FIGS. 8 and 9 schematically show a conventional example of a ventilation switching valve device constituted by using an axially operated three-way valve.
Reference numeral a denotes an air supply passage, b denotes an exhaust passage, and c denotes a passage to a regenerative burner d. Valve seats e and f are provided in the air supply passage a and the exhaust passage b with the passage c interposed therebetween. The valve g is driven forward and backward between the valve seats e and f by a valve shaft i driven by a driving unit h.

FIG. 8 shows a state in which the regenerative burner d is burned. A valve body g is in contact with a valve seat f of an exhaust passage b by a valve shaft i, the exhaust passage b side is closed, and an air supply passage is provided. a
Side is open, and in this state, the air supply passage a
From the regenerative burner d via passage c
And supplied for combustion.

FIG. 9 shows a state in which the exhaust gas is exhausted from the regenerative burner d. The valve element g contacts the valve seat e of the air supply passage a by the valve shaft i, and the exhaust passage b side is opened and supplied. The air passage a side is closed, and in this state, high-temperature exhaust gas that has passed through the regenerative burner d flows from the passage c to the exhaust passage b and is exhausted. Therefore, in this case, each member such as the valve body g and the casing thereof constituting the valve is exposed to high-temperature exhaust gas, and heat resistance is a problem.

[0005]

Conventionally, such a ventilation switching valve device has the following problems. a. Usually, in order to improve the heat resistance, members such as a valve body and a casing constituting the valve must be changed to a high-grade material having excellent heat resistance, which greatly increases the price of the valve. b. When cooling the inside of a furnace using a regenerative burner (including an indirect heating furnace using a radiant tube, etc.) for operational reasons, supply air to one of the pair of regenerative burners. However, if the exhaust gas is continuously exhausted from the other regenerative burner side, the furnace can be cooled quickly. It is difficult. c. Therefore, in practice, a method of switching the ventilation and alternately performing exhaust is performed, but in this method, heat exchange is performed in the regenerator and supplied to the furnace, so that the cooling speed is reduced. . An object of the present invention is to solve such a problem.

[0006]

According to the present invention, there is provided a valve device for switching the ventilation of a regenerative burner, which is provided at an upstream side of a valve body for closing a supply side at the time of exhaust. We propose a ventilating switching valve device for a regenerative burner in which a ventilation part is formed and a small amount of air flows from the ventilation part through the periphery of the valve body even when closed.

A valve device applied to the above-described ventilation switching valve device includes an axially operated two-way valve, a butterfly valve, and an axially operated three-way valve which open and close by moving a valve body toward and from a valve seat. In these, it is proposed that a ventilation portion is formed on the valve seat side so as to abut on the valve seat when closed.

[0008] As a method of forming the ventilation portion, the valve body has a structure in which two plate bodies are supported at an appropriate distance from each other.
The present invention proposes a configuration in which a ventilation hole is provided in the valve-seat-side plate body, and a configuration in which an air passage is formed from a ventilation hole that opens on the valve seat side of the valve body to a ventilation hole that opens around the valve body.

According to the present invention, a small amount of normal-temperature air passes through the periphery of the valve body by the ventilation section even when the air supply side valve is closed when exhausting from the regenerative burner. Since the air flows, the members such as the valve body and its casing are cooled by the normal-temperature air, and the heat resistance is greatly improved.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of the present invention will be described with reference to FIGS.
This will be described with reference to FIG. First, FIGS. 1 to 3 show a first embodiment of the present invention. In FIG.
Indicates an air supply passage, 2 indicates an exhaust passage, and 3 indicates a passage to the regenerative burner 4. Valve seats 5 and 6 are provided in the air supply passage 1 and the exhaust passage 2 with the passage 3 interposed therebetween. The valve body 7 is driven forward and backward between the valve seats 5 and 6 by a valve shaft 9 driven by a drive unit 8. The plate body 10 is supported at a position that is appropriately spaced from the valve body 7 toward the valve shaft 9, and a ventilation hole 11 is formed in the plate body 10. In this example, the number of the vent holes 11 is four as shown in FIG. 3, but the number, shape and the like are appropriate.

In the above configuration, when the regenerative burner 4 is burned, when the drive unit 8 is driven to advance the valve body 7 by the valve shaft 9 and abut against the valve seat 6, as shown in FIG. The valve portion of the exhaust passage 2 is closed, and the valve portion of the air supply passage 1 is opened. Therefore, air from the upstream side of the air supply passage 1 is supplied to the regenerative burner 4 from the passage 3 via the valve seat 5 and is subjected to combustion. At this time, the plate body 10 attached to the valve body 7 has no function.

Next, when exhaust gas from combustion of another regenerative burner (not shown) is exhausted from the regenerative burner 4, the drive unit 8 is driven to move the valve element 7 from the valve seat 6 by the valve shaft 9 to the valve seat 6. It is retracted and is brought into contact with the valve seat 5 this time. Actually, the valve body 7 does not abut on the valve seat 5, and the plate body 10 abuts on the valve seat 5.

In this state, the exhaust gas having passed through the generative burner 4 due to the suction of the exhaust blower is passed through the passage 3.
Through the valve seat 6 to the exhaust passage 2, where it flows and is exhausted. At this time, due to the suction of the exhaust blower, normal-temperature air in the air supply passage 1 flows into the gap 12 between the ventilation hole 11 of the plate body 10 and the valve body 7, and flows out around the valve body 7. The exhaust gas is exhausted through the exhaust passage 2 together with the exhaust gas.
Since the normal-temperature air flowing out of the air supply passage 1 cools the valve body 7 and its casing and the like, these members are not exposed to high-temperature exhaust gas. Therefore, heat resistance is significantly improved, and sufficient heat resistance can be obtained even if the material is not expensive.

In the above embodiment, the plate 10 supported at an appropriate distance from the valve body 7 constitutes the above-described ventilation part. In the embodiment shown in FIG. 4, however, the ventilation part is thick. It is constituted by the formed valve element 7 itself. That is, the valve element 7
A suitable number of ventilation holes 12 opened in this surface on the valve shaft 9 side.
Are formed, and an air passage 14 is formed around the valve body 7 and has a ventilation hole 13 formed therebetween.

In the above embodiment, the present invention is applied to an axially operated three-way valve. As is apparent from the drawing, in the present invention, the present invention is applied to an axially operated two-way valve. 5 to 7
As shown in the figure, the present invention can be applied to a butterfly valve.
5 to 7, the same components as those shown in FIGS. 1 to 4 are denoted by the same reference numerals, and redundant description will be omitted. FIG. 6 shows the operation during combustion of the regenerative burner, similarly to FIG. 1, in which the butterfly valve is open. FIGS. 7 and 5 show the operation at the time of exhaustion in which the valve body 7 and the like may be exposed to high-temperature exhaust gas. The butterfly valve is in the closed state, but the exhaust valve 2 is extended. Since the normal temperature air in the air supply passage 1 flows out of the ventilation hole 11 formed in the plate 10 through the periphery of the valve 7 by the exhaust blower, the valve 7 and the like are cooled. Reference numeral 14 denotes a valve body of a butterfly valve in the exhaust passage 2. The other operations described above are self-evident from the figure, and thus the description is omitted. Further, in this embodiment, the ventilation portion is constituted by the plate body 10 as in the embodiment of FIGS. 1 to 3, but the configuration of FIG. 4 can be applied to a butterfly valve.

[0016]

As described above, the present invention has the following effects. a. Since the heat resistance can be improved without using a high-grade and expensive material having excellent heat resistance, the price can be kept low. b. When the inside of a furnace using a regenerative burner (including an indirectly heated furnace using a radiant tube, etc.) is cooled for operational reasons due to the improvement in heat resistance, one of the pair of regenerative burners is cooled. While supplying air to the burner side, exhaust can be continuously performed from the regenerative burner side on the other side, so that the furnace can be cooled quickly.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view schematically showing a first embodiment of a ventilation switching valve device to which the present invention is applied.

FIG. 2 is a longitudinal sectional view schematically showing a first embodiment of the ventilation switching valve device to which the present invention is applied, in a state of operation different from that of FIG.

FIG. 3 is a sectional view taken along line XX of FIG. 1;

FIG. 4 is a longitudinal sectional view showing another embodiment of the ventilation section.

FIG. 5 is a cross-sectional view schematically showing another embodiment of the ventilation switching valve device to which the present invention is applied.

6 is a longitudinal sectional view schematically showing the operation of the ventilation switching valve device of FIG. 5;

7 is a longitudinal sectional view schematically showing the operation of the ventilation switching valve device of FIG. 5 as a state of operation different from that of FIG. 6;

FIG. 8 is a longitudinal sectional view schematically showing the configuration and operation of a conventional ventilation switching valve device.

FIG. 9 is a longitudinal sectional view schematically showing the configuration and operation of a conventional ventilation switching valve device in a state of operation different from that of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Air supply passage 2 Exhaust passage 3 Passage 4 Generative burner 5, 6 Valve seat 7 Valve body 8 Drive rod 9 Operating shaft 10 Plate body 11, 12 Vent hole 13 Air passage 14 Valve body

────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Dennis Quinn 44455, Cleveland, East 44th Street, East 71st Street 4455 North American Manufacturing Company Inside (56) References JP 8-320107 (JP, A) Kaihei 4-33826 (JP, U) JP-A 4-28276 (JP, U) JP-A-3-6175 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) F23L 15 / 02 F23D 14/66 F16K 25/00

Claims (6)

(57) [Claims] 1. A valve device for switching ventilation of a regenerative burner, wherein a ventilation portion is formed on an upstream side of a valve body that closes an air supply side when exhausting air, and also when the valve is closed, the ventilation portion passes through the periphery of the valve body. A ventilation switching valve device for a regenerative burner, characterized in that a small amount of air flows. 2. The valve device is an axially operated two-way valve that opens and closes by moving a valve body forward and backward with respect to a valve seat. 2. The valve device for ventilation switching in a regenerative burner according to claim 1, wherein the valve device is configured to be in contact with the valve. 3. The valve device is a butterfly valve, and the valve body includes:
2. The valve device for switching ventilation in a regenerative burner according to claim 1, wherein a ventilation portion is formed on the valve seat side so as to abut on the valve seat when closed. 4. A valve device, wherein a valve seat is formed on each of an air supply passage and an exhaust passage with a passage to a regenerative burner side interposed therebetween, and a shaft for switching between an open / close side by an advance / retreat operation of a common valve element. 2. A regenerative relay according to claim 1, wherein the valve is a dynamic three-way valve, and the valve body has a ventilation portion formed on a valve seat side of an air supply passage so as to abut on the valve seat when closed. Valve device for switching ventilation in tidal burner 5. The regenerator according to claim 2, wherein the valve body has a structure in which two plate bodies are supported at an appropriate distance from each other, and a ventilation hole is provided in the valve seat side plate body. Valve device for ventilation switching in a latitudinal burner 6. The regenerator according to claim 2, wherein the valve body has an air passage extending from a vent hole opened on the valve seat side to a vent hole opened around the valve body. Valve device for ventilation switching in a latitudinal burner