JP2012032052A - Heat exchanger and water heater equipped with the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat exchanger capable of properly preventing such a trouble as drain which is generated following heat recovery and exhausted to the outside of a case through an exhaust opening and properly reduces the size in the vertical direction.SOLUTION: The heat exchanger HE includes a case 7 which contains an air supply opening 71 and an exhaust opening 72 for the heating gas, and a heat propagation pipe 4 which is stored in the case 7 and can recover heat from the heating gas that has entered the case 7 from the air supply opening 71. A partitioning wall 8 is provided in the case 7. In the case 7, a heat exchange region 76 in which the heat propagation pipe 4 is stored and an exhaust introducing chamber 77 of which the exhaust opening 72 is provided at an upper wall 70b are so formed by partitioning that they are arrayed in the horizontal direction. Between the heat exchange region 76 and the exhaust introducing chamber 77, a communication opening 80 is formed which introduces the heating gas that has completed heat recovery to the exhaust introducing chamber 77 from the heat exchange region 76.

Description

  The present invention relates to a heat exchanger used for recovering heat from a heating gas such as combustion gas, and a hot water apparatus such as a hot water supply apparatus provided with the heat exchanger.

  The heat exchanger used in the hot water apparatus is generally configured such that a heat transfer tube is accommodated in a case having an air supply port and an exhaust port. Combustion gas generated by the burner is supplied into the case, and thereby hot water flowing through the heat transfer tube is heated. In such a heat exchanger, when latent heat is recovered from the combustion gas, a strongly acidic drain (condensed water) is generated. On the other hand, the combustion gas is generally forcibly supplied into the case using the blowing pressure of the fan, and the flow rate of the combustion gas is relatively high. For this reason, in the heat exchanger for recovering latent heat, it is necessary to consider that the strongly acidic drain is not discharged from the exhaust port by being blown off by the combustion gas. If the strongly acidic drain is discharged from the exhaust port, there is a problem that the periphery of the exhaust port is contaminated outside the case.

  As a specific example of the heat exchanger for recovering latent heat, there is one described in Patent Document 1. In the heat exchanger for recovering latent heat described in the same document, an exhaust port is provided in the upper wall portion of the case that houses the heat transfer tubes. In addition, a member is provided in the case that covers the upper side or one side of the heat transfer tube. Between this member and the upper wall or side wall of the case, the combustion gas after the recovery of latent heat is exhausted to the exhaust port. A combustion gas flow path for guiding the gas is formed. According to such a configuration, the drain generated along with the latent heat recovery hardly passes through the combustion gas flow path and reaches the exhaust port, and the drain is prevented from being discharged outside the case.

  However, the above-described heat exchanger for recovering latent heat has the following problems. That is, when designing and manufacturing a heat exchanger, there is a case where the size in the vertical direction is desired to be as small as possible from the viewpoint of reducing the height of the entire hot water apparatus. However, in the heat exchanger described above, a combustion gas passage for guiding the combustion gas after the recovery of latent heat to the exhaust port is formed between the heat transfer tube and the upper wall portion of the case. Accordingly, the size of the entire heat exchanger in the vertical height direction is increased by the amount of such a flow path.

JP 2008-138992 A

  The present invention has been conceived under the circumstances as described above, and can appropriately prevent a problem that a drain generated due to heat recovery is discharged from the exhaust port to the outside of the case. An object of the present invention is to provide a heat exchanger capable of appropriately reducing the size in the vertical height direction, and a hot water device including the heat exchanger.

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

The heat exchanger provided by the first aspect of the present invention includes a case having an air supply port and an exhaust port for heating gas, and is accommodated in the case and flows into the case from the air supply port. A heat exchanger capable of recovering heat from the heating gas, and the partition wall is provided in the case so that the heat transfer tube is accommodated in the case. The heat exchange region and the exhaust induction chamber provided with the exhaust port on the upper wall are partitioned and formed in a horizontal direction. Between the heat exchange region and the exhaust induction chamber, A communication port is provided for guiding the recovered heating gas from the heat exchange region to the exhaust induction chamber.

According to such a configuration, the following effects can be obtained.
First, the heating gas whose heat has been recovered in the heat exchange region passes through the communication port and then flows into the exhaust induction chamber, and then reaches the exhaust port provided in the upper wall portion and reaches the outside of the case. Discharged. If the heating gas is diverted to the exhaust induction chamber and then led to the exhaust port, the drain generated in the heat exchange region is not discharged from the exhaust port to the outside of the case due to the influence of the heating gas. Can be. As a result, it is possible to appropriately prevent the drain contamination around the exhaust port.
Secondly, the heat exchange region and the exhaust induction chamber are partitioned so as to be aligned in the horizontal direction. Unlike the above-described Patent Document 1, the heating gas is provided between the heat transfer tube and the upper wall portion of the case. There is no need to separately form a flow path for circulating the liquid. Therefore, the size of the case in the vertical height direction can be reduced by that amount, which is suitable when the entire heat exchanger is required to be thin.

  In this invention, Preferably, the advancing direction of the heating gas in the said communicating port is made into the direction which cross | intersects the advancing direction of the heating gas in the said heat exchange area | region.

  According to such a configuration, the drain existing in the heat exchange region can be prevented from being directly blown off in the direction of the communication port by the heating gas. Therefore, this is preferable for reducing the amount of drain flowing into the exhaust induction chamber.

  In the present invention, it is preferable that the exhaust induction chamber has a lower flow rate than the opening area of the communication port so that the heating gas that has passed through the communication port flows into the exhaust induction chamber. It is formed as a space having a large flow area.

  According to such a configuration, when the heating gas passes through the communication port and flows into the exhaust induction chamber, the flow velocity thereof decreases, so even if there is a drain in the exhaust induction chamber, It is appropriately avoided that the drain is blown out vigorously toward the exhaust port. As a result, it is more preferable to prevent the drain from reaching the exhaust port more reliably and prevent the outside of the case from being contaminated by the drain.

  In the present invention, preferably, the whole or a part of the outer peripheral edge of the partition wall is provided so as not to form a gap with the inner surface of the case, and the drain generated due to heat recovery in the heat exchange region Is configured to be able to be suppressed by the partition wall from moving to the exhaust induction chamber side along the inner surface of the case.

  According to such a configuration, it is possible to reduce the amount of the drain that enters the exhaust induction chamber, and it is possible to more thoroughly prevent the drain from being discharged from the exhaust port.

  The hot water device provided by the second aspect of the present invention is a hot water device including a heat exchanger capable of heating hot water by performing heat recovery from a heating gas, and as the heat exchanger, The heat exchanger provided by the first aspect of the present invention is used.

  According to such a configuration, the same effect as described for the heat exchanger provided by the first aspect of the present invention can be 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 front sectional drawing which shows an example of the hot water apparatus which concerns on this invention. FIG. 2 is a plan sectional view of FIG. 1. FIG. 3 is a sectional view taken along line III-III in FIG. 1. It is IV-IV sectional drawing of FIG. It is explanatory drawing which shows typically the usage example of the hot water apparatus shown in FIG.

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

  1 to 4 show an example of a hot water apparatus to which the present invention is applied. As clearly shown in FIG. 1, the hot water device WH of the present embodiment includes a burner 3, a primary heat exchanger 1, and a secondary heat exchanger HE.

  The burner 3 is a gas burner for burning fuel gas, for example, and is accommodated in the can 30, and combustion air is supplied from the fan 31 to the burner 3. The primary heat exchanger 1 is for recovering sensible heat from the combustion gas generated by the burner 3, and is configured using a finned tube made of, for example, copper. This primary heat exchanger 1 does not correspond to an example of a heat exchanger according to the present invention.

  The secondary heat exchanger HE corresponds to an example of the heat exchanger according to the present invention, and is for recovering latent heat from the combustion gas after the sensible heat is recovered by the primary heat exchanger 1. The secondary heat exchanger HE includes a case 7 mounted on the can 30, a plurality of heat transfer tubes 4 accommodated in the case 7, and a partition wall 8 provided in the case 7. is doing.

  As clearly shown in FIG. 2, the plurality of heat transfer tubes 4 are configured using a plurality of spiral tubes having an oval shape in plan view. The plurality of spiral tubular bodies have different sizes from each other, and are arranged in a substantially concentric wrapping shape. The lower end portion and the upper end portion of each heat transfer tube 4 are formed as straight tubular body portions 40a and 40b extending substantially horizontally, and header portions 6A and 6B for entering and discharging hot water are connected to these end portions. Yes. The hot water supplied to the header portion 6A flows into the plurality of heat transfer tubes 4 and reaches the header portion 6B, but is heated in the flow process. Thereafter, the hot water is sent to the water inlet 13a of the primary heat exchanger 1 through the pipe 99a, further heated by the primary heat exchanger 1, and then reaches the hot water outlet 14a to be supplied to a desired hot water supply destination. Is done.

The case 7 has a substantially rectangular parallelepiped shape, and a part of the case 7 protrudes in one direction from above the can 30, and the size in the horizontal direction is relatively large. However, as will be described later, the size of the case 7 in the vertical height direction can be reduced. The inside of the case 7 is partitioned into a heat exchange region 76 and an exhaust induction chamber 77 arranged in the horizontal direction by providing the partition wall 8. The heat exchange region 76 is a region where a plurality of heat transfer tubes 4 are disposed, and a combustion gas supply port 71 is provided at a position near the rear portion of the lower wall portion 70a of the heat exchange region 76, A drain discharge port 78 is provided at a position near the front.

As shown in FIG. 3, the air supply port 71 communicates with the inside of the can body 30, and the combustion gas that has passed through the primary heat exchanger 1 passes upward through the air supply port 71 and the heat exchange region 76. Flow into. The combustion gas that has flowed into the heat exchange region 76 then proceeds toward the front side of the heat exchange region 76, and acts on each heat transfer tube 4 in the process to recover latent heat. The drain discharge port 78 is a part for discharging a strongly acidic drain generated along with the recovery of latent heat to the outside of the case 7. The lower wall part 70 a is in a downward-falling shape, and the drain that has flowed down from the surface of each heat transfer tube 4 onto the lower wall part 70 a is efficiently guided to the drain outlet 78.

  The exhaust induction chamber 77 is a space where the heat transfer tube 4 is not provided, and an exhaust port 72 is provided in the upper wall portion 70b for exhausting the combustion gas after heat recovery to the outside as exhaust gas. Yes. As will be described later with reference to FIG. 5, for example, an exhaust gas guide member 95 can be appropriately connected to the exhaust port 72.

  The partition wall 8 is configured using, for example, a thin metal plate. As best shown in FIGS. 2 and 4, the partition wall 8 forms a communication port 80. The communication port 80 allows the heat exchange region 76 and the exhaust induction chamber 77 to communicate with each other at a position near the front portion of the case 7 so that the combustion gas flows into the exhaust induction chamber 77 from the heat exchange region 76. It is a part for. The traveling direction of the combustion gas in the heat exchange region 76 is the direction from the rear side to the front side of the case 7 as indicated by the arrow N1, whereas the traveling direction when the combustion gas passes through the communication port 80 is , Directions indicated by arrows N2, and these directions intersect each other. The communication port 80 has a considerably smaller width than the exhaust guide chamber 77, and the exhaust guide chamber 77 is formed as a space portion having a flow path area larger than the opening area of the communication port 80.

  As shown in FIG. 4, the communication port 80 is configured by forming a notch recess 80 ′ in the partition wall 8. The substantially full length area of the upper edge part of the partition wall 8, a lower edge part, and a rear edge part contact | abuts to each inner surface of the upper wall part 70b of the case 7, the lower wall part 70a, and the rear wall part 70c, It is welded or brazed so that there is no gap between them. The upper edge portion 81 and the lower edge portion 82 of the notch recess 80 ′ are ribs that stand from the upper wall portion 70 b and the lower wall portion 70 a of the case 7. Such a configuration is useful for preventing the drain generated in the heat exchange region 76 from flowing into the exhaust induction chamber 77 side along the inner surfaces of the upper wall portion 70b and the lower wall portion 70a. In the front portion of the case 7, there is a portion where the lower edge portion 82 is not provided (portion indicated by reference numeral n1). This occurs when a drain enters the exhaust induction chamber 77. It becomes a passage for returning this drain to the heat exchange region 76.

  Next, the effect | action of the hot water apparatus WH provided with the above-mentioned secondary heat exchanger HE is demonstrated.

  First, the combustion gas generated by the burner 3 and after the sensible heat has been recovered by the primary heat exchanger 1 is transferred from the air supply port 71 of the secondary heat exchanger HE into the case 7 as described above. It flows into the heat exchange area 76. Thereby, latent heat recovery using each heat transfer tube 4 is performed from the combustion gas, and appropriate hot water heating can be performed while increasing heat exchange efficiency. The combustion gas that has completed the recovery of latent heat then passes through the communication port 80 and flows into the exhaust induction chamber 77, and is then discharged to the outside from the exhaust port 72 of the upper wall portion 70b. If the combustion gas is not immediately discharged from the heat exchange region 76 to the outside of the case 7 but is once flowed into the exhaust induction chamber 77 and then exhausted, the drain generated in the heat exchange region 76 is affected by the combustion gas. Therefore, it is appropriately prevented from being carried to the exhaust port 72 and can be prevented from being discharged from the exhaust port 72 to the outside of the case.

As indicated by arrows N1 and N2 in FIG. 2, the combustion gas in the heat exchange region 76 passes through the communication port 80 after its traveling direction is greatly changed. For this reason, the phenomenon that many of the drains existing in the heat exchange region 76 are blown away by the combustion gas toward the communication port 80 is less likely to occur. Further, when the combustion gas passes through the communication port 80 and flows into the exhaust induction chamber 77, the flow velocity of the fuel gas is greatly reduced due to the expansion of the flow path area. Therefore, even if a drain flows into the exhaust induction chamber 77, the drain is not blown up to the exhaust port 72 by vigorous combustion gas.

  As the drain generated in the heat exchange region 76, there are drains that flow down from the respective heat transfer tubes 4 onto the lower wall part 70 a, and those that remain attached to the inner surfaces of the upper wall part 70 b and the lower wall part 70 a for a while. On the other hand, the partition wall 8 is provided so as not to form a gap with the inner surface, and the drain is prevented from moving from the heat exchange region 76 side to the exhaust induction chamber 77 side along the inner surface. To do. Since combustion gas passes through the communication port 80, the amount of drain movement from the heat exchange region 76 to the exhaust induction chamber 77 tends to increase in the portion where the communication port 80 is formed. The upper edge portion 81 and the lower edge portion 82 shown in FIG. 4 appropriately regulate such movement of the drain. For this reason, in the secondary heat exchanger HE, the drain is prevented from being exhausted to the outside through the exhaust port 72 more thoroughly, and the periphery of the exhaust port outside the case 7 is covered by the drain. It is possible to prevent the occurrence of contamination.

  The heat exchange region 76 and the exhaust induction chamber 77 are partitioned and formed in the case 7 so as to be aligned in the horizontal direction, and the entire partition wall 8 is accommodated in the case 7. For this reason, it is possible to reduce the size of the case 7 in the vertical height direction and reduce the overall thickness of the secondary heat exchanger HE.

  FIG. 5 shows an example of the case where the warm water unit U is configured by combining the warm water device WH described above with other warm water related devices. In the hot water unit U, the hot water device WH described above is used as an auxiliary heat source device, and a hot water storage tank 90, an expansion tank 91, a heat exchanger 92, a controller unit 93 having a control board, and an exterior case for housing these units. 96. An exhaust top 94 is provided on the top surface portion 96 a of the exterior case 96.

  This hot water unit U uses, for example, a solar collector, a heat pump, a gas engine (not shown) or the like as a main heat source, and a heat medium circulation circuit (circulates a heat medium between the main heat source ( (Not shown) is provided. The expansion tank 91 is for absorbing the expansion of the heat medium to stabilize the pressure of the heat medium circuit, and the heat exchanger 92 is for heating hot water using the heat medium. is there. The hot water storage tank 90 is for storing hot water generated by heating using the heat exchanger 92. The hot water device WH is used to heat hot water when the hot water temperature in the hot water storage tank 90 is less than the target hot water temperature.

  An exhaust gas guide member 95 formed in a cylindrical shape is connected to the exhaust port 72 of the hot water apparatus WH, and an exhaust top 94 is connected to the guide member 95. The exhaust top 94 includes an exhaust port 94a that faces substantially in the horizontal direction above the top surface portion 96a of the outer case 96, and is rotatable in the substantially horizontal direction. By this rotation, the direction of the exhaust port 94a is changed, and the exhaust gas discharge direction can be appropriately adjusted.

In the hot water unit U as described above, if the drain is discharged from the exhaust port 94a of the exhaust top 94, the top surface portion 96a of the outer case 96 is contaminated. However, since the hot water apparatus WH has a function of preventing drain discharge as much as possible as described above, such a fear can be appropriately avoided. In particular, since the hot water unit U includes the hot water storage tank 90, the entire size is relatively large and the size of the top surface portion 96a is also large, so that the wide range of the top surface portion 96a is contaminated by the drain. Although it is desired to be prevented as much as possible, according to the present embodiment, it is possible to appropriately meet such a demand. Further, the secondary heat exchanger HE of the hot water apparatus WH has a relatively large size in the left-right width direction, and a part of the secondary heat exchanger HE protrudes from a position directly above the burner 1 or the primary heat exchanger 1. . Such a configuration is convenient for placing only the exhaust port 72 and its peripheral portion in the hot water device WH close to the hot water storage tank 90 and disposing them at a substantially central position in the outer case 90. According to such a configuration, it is possible to arrange the exhaust top 94 in an attractive manner at the central portion of the top surface portion 96a or in the vicinity thereof.

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

  The partition wall referred to in the present invention may have a function of partitioning the case so that the heat exchange region and the exhaust induction chamber are aligned in the horizontal direction, and may not be flat. The heat transfer tube is not limited to the one using a spiral tube, and may be configured to use, for example, a straight tube or a meandering flexible tube. The case is not limited to a rectangular parallelepiped shape as long as it can accommodate the heat transfer tubes.

  Various gases other than the combustion gas can be used as the heating gas. The heat exchanger according to the present invention does not recover only latent heat but can be configured as a heat exchanger that can recover both sensible heat and latent heat. Moreover, it can also be used for uses other than the hot water heating use. The hot water device as used in the present invention means a device having a function of generating hot water, and is used for various types of hot water supply devices for general hot water supply, bath hot water supply, heating, snow melting, and the like, and hot water supply. It is a concept that includes a wide range of equipment for producing hot water.

WH Hot water device HE Secondary heat exchanger (heat exchanger)
4 Heat transfer tube 7 Case 8 Partition wall 70b Upper wall (case)
71 Air supply port 72 Exhaust port 76 Heat exchange area 77 Exhaust induction chamber 80 Communication port

Claims (5)

A case having an inlet and an outlet for a heating gas;
A heat transfer tube accommodated in the case and capable of recovering heat from the heating gas flowing into the case from the air supply port;
A heat exchanger comprising:
By providing the partition wall in the case, the heat transfer region in which the heat transfer tube is accommodated and the exhaust induction chamber in which the exhaust port is provided in the upper wall portion are horizontally arranged in the case. The compartments are formed to line up with
Between the heat exchange region and the exhaust induction chamber, a communication port for guiding the heating gas after heat recovery from the heat exchange region to the exhaust induction chamber is provided, Heat exchanger.   The heat exchanger according to claim 1, wherein a traveling direction of the heating gas in the communication port is a direction intersecting with a traveling direction of the heating gas in the heat exchange region.   The exhaust induction chamber is a space having a flow passage area larger than the opening area of the communication port so that the flow velocity of the heating gas that has passed through the communication port flows into the exhaust induction chamber. The heat exchanger according to claim 1 or 2 formed as a part.   The whole or part of the outer peripheral edge of the partition wall is provided so as not to form a gap with the inner surface of the case, and a drain generated due to heat recovery in the heat exchange region travels along the inner surface of the case. 4. The heat exchanger according to claim 1, wherein the heat exchanger can be suppressed by the partition wall from moving toward the exhaust induction chamber. A hot water apparatus comprising a heat exchanger capable of hot water heating by performing heat recovery from a heating gas,
A hot water apparatus, wherein the heat exchanger according to any one of claims 1 to 4 is used as the heat exchanger.

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