JP2012077965A - Exhaust cylinder, and combustion device equipped with the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an exhaust cylinder capable of appropriately preventing or suppressing such a failure that, when dew condensation water is produced in the exhaust cylinder, the dew condensation water passes and leaks through a seal part between an inner cylinder and an outer cylinder.SOLUTION: The exhaust cylinder 2 includes: an inner cylinder 20 which circulates exhaust gas generated in a combustion device C through the inner part thereof, and an outer cylinder 21 which is fitted to the inner cylinder 20 from the outside and is extended toward the upper side than the inner cylinder 20; and a seal member 4 which is set between the inner cylinder 20 and the outer cylinder 21. An aperture part 22 for guiding the dew condensation water entering a gap 24 between the inner cylinder 20 and the outer cylinder 21 to the inside of the inner cylinder 20 on a position higher than the seal member 4, is disposed through the inner cylinder 20.

Description

  The present invention relates to an exhaust pipe for guiding exhaust gas to a desired location and discharging it in a combustion apparatus such as a hot water supply apparatus including a burner, and a combustion apparatus including the exhaust pipe.

  For example, in an indoor installation type combustion apparatus, a configuration in which exhaust gas is guided to the outdoors using an exhaust pipe and then discharged is often employed. In such a configuration, the exhaust gas may decrease in temperature while passing through the exhaust pipe, and the water vapor contained in the exhaust gas may be condensed to generate a drain (condensed water). Therefore, conventionally, there is a means for providing a drain receiver in the exhaust cylinder for receiving a drain that flows down along the inner surface of the exhaust cylinder so that the drain does not flow down to a lower region of the exhaust cylinder ( For example, see Patent Document 1).

  On the other hand, when an exhaust pipe is provided in a combustion device, a relatively short tubular portion is provided in the combustion device main body so that the combustion device main body does not become large and bulky. A method of connecting a long cylindrical body to the cylindrical portion is often used. In that case, a structure as shown in FIG. 4 may be adopted. In the configuration shown in the figure, the exhaust cylinder 9 has an inner cylinder 90 and an outer cylinder 91 fitted on the inner cylinder 90, and the outer cylinder 91 extends above the inner cylinder 90. Further, a seal member 92 is interposed between the inner cylinder 90 and the outer cylinder 91.

  However, when the structure as shown in FIG. 4 is adopted, there is a risk of causing a problem as described below.

  That is, since the seal member 92 is interposed between the inner cylinder 90 and the outer cylinder 91, a suitable seal should be originally achieved in this portion. However, when the inner cylinder 90 and the outer cylinder 91 are distorted, it is not always possible to obtain perfect water sealing performance. Such a concern becomes more conspicuous when the inner cylinder 90 and the outer cylinder 91 are made of sheet metal. In this case, when the drain is generated, there is a risk that the drain may enter the gap 93 between the inner cylinder 90 and the outer cylinder 91, and the drain passes through the mounting portion of the seal member 92 and leaks downward. Things can happen. Such drain leakage is more likely to occur as more drainage accumulates above the seal member 92 in the gap 93 and the fluid pressure P2 increases. For this reason, conventionally, there has been a case where the peripheral portion of the drain leakage point is contaminated and is likely to be corroded. Note that it is difficult for the means described in Patent Document 1 described above to properly resolve the problem.

JP 2002-317922 A

  The present invention has been conceived under the circumstances as described above, and when a drain is generated inside, the drain passes through a seal portion between the inner cylinder and the outer cylinder. It is an object of the present invention to provide an exhaust pipe capable of appropriately preventing or suppressing leakage and a combustion apparatus including the same.

  In order to solve the above problems, the present invention takes the following technical means.

  The exhaust cylinder provided by the first aspect of the present invention includes an inner cylinder through which exhaust gas generated in the combustion device circulates, and an outer cylinder that is externally fitted to the inner cylinder and extends upward from the inner cylinder. An exhaust cylinder provided between the inner cylinder and the outer cylinder, wherein the inner cylinder is provided with a drain that has entered the gap between the inner cylinder and the outer cylinder. A hole portion is provided at a position higher than the seal member so as to lead to the inside of the inner cylinder.

  According to such a configuration, even if a drain is generated in the exhaust cylinder and the drain enters the gap between the inner cylinder and the outer cylinder and proceeds downward, the hole provided in the inner cylinder By utilizing the portion, it is possible to escape inside the inner cylinder at a position higher than the seal member. For this reason, it is possible to prevent a large hydraulic pressure from acting on the seal member by preventing a large amount of drain from accumulating in a region above the seal member in the gap between the inner cylinder and the outer cylinder. For this reason, compared with a prior art, it becomes difficult for a drain to pass through the attachment location of a sealing member, and the inappropriate leak of a drain can be prevented or suppressed appropriately.

  In the present invention, it is preferable that a concave groove for locally increasing a width of a gap between the inner cylinder and the outer cylinder is formed on an outer surface of the inner cylinder at a position higher than the seal member, and the hole The portion is provided so as to guide the drain that has entered the concave groove to the inside of the inner cylinder.

  According to such a configuration, when the drain advances downward through the gap between the inner cylinder and the outer cylinder, the drain is likely to enter the concave groove in which the gap width is large. The drain that has entered the concave groove passes through the hole and escapes to the inside of the inner cylinder. Therefore, according to the said structure, escape of a drain inside an inner cylinder is accelerated | stimulated, and it becomes more suitable for preventing a drain leaking under the installation location of a sealing member.

  In the present invention, it is preferable that a drain that has passed through the hole is received from a gap between the inner cylinder and the outer cylinder on the inner side of the inner cylinder, and the received drain is guided at least to the outside of the inner cylinder. It is possible to have a drain receptacle.

  According to such a configuration, it is possible to appropriately prevent the drain that has passed through the hole portion from the gap between the inner cylinder and the outer cylinder and advanced to the inside of the inner cylinder from flowing down to the lower side of the inner cylinder as it is.

  The combustion apparatus provided by the 2nd side surface of this invention is a combustion apparatus provided with the burner and the exhaust pipe for discharging | emitting the combustion gas produced | generated by this burner to an external desired location as waste gas. In this case, the exhaust pipe provided by the first aspect of the present invention is used as the exhaust pipe.

  According to such a configuration, the same effect as described for the exhaust pipe provided by the first aspect of the present invention can be obtained.

The exhaust cylinder provided by the third aspect of the present invention includes an inner cylinder through which exhaust gas generated in the combustion device circulates, and an outer cylinder that is externally fitted to the inner cylinder and extends upward from the inner cylinder. And an exhaust cylinder provided between the inner cylinder and the outer cylinder, wherein one of the inner cylinder and the outer cylinder has a recess into which the seal member is inserted. A portion of the other of the inner cylinder and the outer cylinder that is formed and abuts on the seal member is configured as a tube expansion processing portion that has been expanded.
According to such a configuration, the roundness of the portion in contact with the seal member is increased, the adhesion to the seal member is improved, and the drain is prevented or suppressed from leaking below the mounting position of the seal member. A desirable effect is also obtained.

  Other features and advantages of the present invention will become more apparent from the following description of embodiments of the present invention with reference to the accompanying drawings.

It is a schematic sectional drawing which shows an example of the combustion apparatus which concerns on this invention. It is principal part sectional drawing of the combustion apparatus shown in FIG. It is principal part sectional drawing which shows the other example of this invention. It is principal part sectional drawing which shows an example of a prior art.

  Hereinafter, preferred embodiments of the present invention will be specifically described with reference to the drawings.

  A combustion apparatus C of the present embodiment shown in FIG. 1 is configured as a hot water supply apparatus, and includes a combustion apparatus main body 1 and a supply / exhaust top T. The combustion apparatus C includes an exhaust cylinder 2, and the exhaust cylinder 2 includes an inner cylinder 20 and an outer cylinder 21. The inner cylinder 20 has a relatively short cylindrical shape that is provided upright on the upper portion of the combustion apparatus main body 1. The outer cylinder 21 has a relatively long cylindrical shape constituting the air supply / exhaust top T. The outer cylinder 21 is fitted on the upper portion of the inner cylinder 20 and extends above the inner cylinder 20. This combustion apparatus C has a great feature in the seal structure of the inner cylinder 20 and the outer cylinder 21, and details thereof will be described later.

  The combustion apparatus main body 1 includes a burner 11 housed in a case 10, a heat exchanger 12, a fan 13 having a motor M, and an outer case 19 surrounding them. The burner 11 is a gas burner that burns fuel gas, for example, and the fan 13 supplies combustion air to the burner 11. The heat exchanger 12 performs heat recovery from the combustion gas generated by the burner 11 to perform hot water heating, and is configured using, for example, a finned tube. Hot water flowing through the tube is heated by the combustion gas and then supplied to a desired hot water supply destination.

  In the upper part of the case 10, an inner cylinder 20 that is a constituent element of the exhaust cylinder 2 and a tubular body portion 30 that is a constituent element of the supply cylinder 3 are provided in a double pipe structure. The lower end side of the supply / exhaust top T is fitted and connected to these portions. In addition to the outer cylinder 21 described above, the air supply / exhaust top T includes a tube body portion 31 that is fitted to the tube body portion 30 and extends upward, and the supply cylinder 3 is configured by these. An air supply port 33 covered with a cover body 32 is provided in the upper portion of the supply cylinder 3. Outside air flows into the supply cylinder 3 from the supply port 33 and then passes through the duct 16 and is sucked into the fan 13. The combustion gas whose heat has been recovered by the heat exchanger 12 flows into the exhaust cylinder 2 as exhaust gas, and is exhausted to the outside from the exhaust port 50 of the cover portion 5 provided at the upper part of the exhaust cylinder 2.

  As shown in FIG. 2, a seal member 4 is interposed between the inner cylinder 20 and the outer cylinder 21 of the exhaust cylinder 2. The seal member 4 is an O-ring made of an elastic member, and is positioned and held using an annular recess 23 on the inner peripheral surface of the outer cylinder 21. On the other hand, the inner cylinder 20 is provided with a plurality of (for example, about three) hole portions 22. These holes 22 are portions for allowing the drain that has entered the gap 24 between the inner cylinder 20 and the outer cylinder 21 to pass inside the inner cylinder 20, in the vicinity of the seal member 4, from the seal member 4. Is also located at a high position.

A drain receiver 6 is provided inside the inner cylinder 20. The drain receiver 6 includes a main body 60 that can receive the drain that has passed through the hole 22 and a drain discharge pipe 61 that is connected to the main body 60. The main body 60 has a form of a container having an open top surface and a hollow circular shape in plan view. The drain discharge pipe 61 passes through the inner cylinder 20 and the pipe body portion 30 of the supply cylinder 3, and the drain received by the main body portion 60 is discharged from the outside of the case 10 of the combustion apparatus main body portion 1 by drain discharge. It plays a role in leading to discharge where it does not cause adverse effects.

  The portion of the inner cylinder 20 that is in contact with the seal member 4 is subjected to a tube expansion process by pressing (the increased dimension due to the tube expansion may be almost zero, and the expanded tube state is omitted in the drawing. ) As a result, the roundness of the portion in contact with the seal member 4 is increased, and the adhesion to the seal member 4 is also improved. This is preferable in order to improve the sealing performance at the place where the seal member 4 is mounted.

  Next, the operation of the above-described combustion apparatus C will be described.

  First, in the exhaust cylinder 2, water vapor in the exhaust gas is condensed to generate a drain, and this drain may enter the gap 24 by going down the inner peripheral surface of the outer cylinder 21. Even if such a phenomenon occurs, the drain that has entered the gap 24 passes through the hole 22 and escapes to the inside of the inner cylinder 20. For this reason, it becomes possible to prevent many drains from accumulating in the clearance 24 above the seal member 4. More specifically, according to the present embodiment, as shown in FIG. 2, the drain only accumulates up to the height H <b> 1 of the hole 22 on the upper side of the seal member 4. On the other hand, in the conventional structure shown in FIG. 4, the drain is accumulated up to the height H2 of the upper end of the inner cylinder 90. For this reason, in the present embodiment, the hydraulic pressure of the drain acting on the seal member 4 becomes low, and the drain does not easily pass through the mounting location of the seal member 4. As a result, leakage of the drain below the seal member 4 is appropriately prevented or suppressed, and for example, it is possible to appropriately eliminate the problem that the upper surface portion of the case 10 is easily corroded by the drain. .

  The drain that has passed through the hole 22 is received by the main body 60 of the drain receiver 6, and then passes through the drain discharge pipe 61 and is discharged to a location that is not adversely affected by the drain. Therefore, it is possible to prevent a problem that the drain that has passed through the hole 22 flows down to the lower side inside the inner cylinder 20 and contaminates each part in the case 10. The drain receiver 6 is not limited to the drain that has passed through the hole 22, but also includes a drain that has traveled down the inner surface of the inner cylinder 20 (including a drain that has traveled from the inner surface of the outer cylinder 21 to the inner surface of the inner cylinder 20). It receives appropriately and plays the role of guiding to a desired position.

  FIG. 3 shows another embodiment of the present invention. In the figure, the same or similar elements as those in the above embodiment are given the same reference numerals as in the above embodiment.

  In the configuration shown in FIG. 3, a concave groove 27 is formed on the outer peripheral surface side of the inner cylinder 20 of the exhaust cylinder 2. As a result, the width of the gap 24 between the inner cylinder 20 and the outer cylinder 21 is locally increased at the location where the concave groove 27 is formed. A hole 22 for guiding the drain that has entered the concave groove 27 to the inside of the inner cylinder 20 is provided at a location where the concave groove 27 is formed. The concave groove 27 is provided in the vicinity of the seal member 4 and at a position higher than the seal member 4.

  According to the present embodiment, at the location where the concave groove 27 is formed, the width of the gap 24 is locally large. 27 is easy to enter. The drain that has entered the concave groove 27 then passes through the hole 22 and flows into the inner cylinder 20. Therefore, it is promoted that the drain flows inside the inner cylinder 20, and it is more preferable to prevent the drain from leaking below the mounting position of the seal member 4.

  The present invention is not limited to the contents of the above-described embodiment. The specific configuration of each part of the exhaust pipe and the combustion apparatus according to the present invention can be varied in design in various ways.

  The exhaust pipe according to the present invention may not be provided in a double structure with the air supply pipe. For example, it can be configured as an exhaust pipe that is not related to the air supply pipe. The exhaust pipe does not necessarily stand upright, and may be inclined obliquely. The combustion device referred to in the present invention is not limited to the one configured as a hot water supply device, and may be configured as a combustion device for a hot air device or for incineration, for example, and a specific application is not limited. . The burner may be an oil burner that burns fuel oil, for example, instead of the gas burner.

C Combustor 2 Exhaust cylinder 4 Seal member 6 Drain receiver 11 Burner 20 Inner cylinder 21 Outer cylinder 22 Hole 24 Clearance 27 Concave groove

Claims (4)

An inner cylinder through which exhaust gas generated in the combustion device circulates, and an outer cylinder that is fitted around the inner cylinder and extends upward from the inner cylinder;
A seal member interposed between the inner cylinder and the outer cylinder;
An exhaust stack comprising:
The exhaust cylinder is characterized in that the inner cylinder is provided with a hole that guides the drain that has entered the gap between the inner cylinder and the outer cylinder to the inside of the inner cylinder at a position higher than the seal member. . Of the inner cylinder, a concave groove is formed on the outer surface at a position higher than the seal member to locally increase the width of the gap between the inner cylinder and the outer cylinder.
The exhaust pipe according to claim 1, wherein the hole is provided so as to guide a drain that has entered the concave groove to the inside of the inner cylinder.   On the inner side of the inner cylinder, a drain receiver that receives the drain that has passed through the hole from the gap between the inner cylinder and the outer cylinder, and that can guide the drain received to at least the outside of the inner cylinder. The exhaust pipe according to claim 1 or 2, comprising the exhaust pipe. With a burner,
An exhaust pipe for discharging the combustion gas generated by this burner to an external desired location as exhaust gas;
A combustion device comprising:
An exhaust pipe according to any one of claims 1 to 3, wherein the exhaust pipe is used as the exhaust pipe.

Images