JP2005321171A - Instantaneous heating device and water heater - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an instantaneous heating device capable of improving the heat exchanging efficiency while simplifying and miniaturizing a structure as a whole, and properly solving a problem that the inside of the device is contaminated by drain. <P>SOLUTION: In this instantaneous heating device comprising a combustor 1 having the downward fuel burning direction, a can body 2 having a peripheral wall part 20 surrounding a combustion chamber 13 at a lower part of the combustor 1, a water pipe 6 for heat exchange, having a coiled tubular body part 60 including a loop part 60a of a plurality of stages arranged in the vertical height direction in the can body 2, and an exhaust passage 40 connected with the can body 2, a drain processing means 3, 34 is mounted at a lower part of the coiled tubular body part 60 for receiving the drain from the coiled tubular body part 60 and discharging the same to the external of the can body 2 and the exhaust passage 40. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an instantaneous heating apparatus and a hot water supply apparatus capable of achieving both improvement in heat exchange efficiency and appropriate drain treatment.

  An example of a conventional heating device for hot water supply is one in which a heat exchanger is connected to the upper part of the combustor. In the heating device having such a configuration, when the combustion gas rising upward from the combustor passes through the heat exchanger, heat is transferred to the water pipe so that the water in the water pipe is heated. It has become. The water pipe is provided, for example, in a posture lying substantially horizontally so that the contact area with the combustion gas is as large as possible.

  In the heating device, when the combustion gas comes into contact with the water pipe, a drain is generated and a phenomenon of adhering to the water pipe occurs. Depending on the type of fuel, this drain is acidic in most cases, and if this drain is dropped from the water pipe, the heating device is corroded. Therefore, in the above-mentioned traditional heating device, there is one in which a drain receiver such as a plate shape is provided below the water pipe (see, for example, Patent Document 1). According to such a configuration, the drain dripping from the water pipe can be collected by the drain receiver, and the dripping of the drain on the lower part of the heat exchanger or on the combustor can be suppressed.

  However, in the above configuration, since the drain receiver is disposed between the combustor and the water pipe, the drain receiver closes the flow path of the combustion gas, and the combustion gas advances directly from the combustor toward the water pipe. Disturb that. In particular, since the drain receiver needs to be formed in a large size so as to cover the entire area of the lower region of the water pipe, the drain receiver has a greater degree of hindering the progress of the combustion gas. This makes it difficult to efficiently bring the high-temperature combustion gas into contact with the water pipe, resulting in poor heat exchange efficiency. In consideration of such circumstances, conventionally, a drain receiver is provided as appropriate only in a part of the lower region of the water pipe. However, in this case, the drain cannot be sufficiently collected. Further, even if the drain receiver is reduced in size, the essential problem that the drain receiver blocks the flow path of the combustion gas and reduces the efficiency of heat exchange cannot be solved.

  Furthermore, the heat exchange method in the traditional heating device is not inherently very efficient in heat exchange. Therefore, as means for improving the efficiency of heat exchange, for example, it is necessary to adopt means for increasing the number of the water pipes or increasing the overall length, for example, by forming the water pipes with finned tubes. However, the use of such means increases the overall size of the heating device and increases the manufacturing cost because the configuration of the finned tube is complicated. Furthermore, the finned tube is desired to be made of copper, for example, from the viewpoint of improving its workability and heat transfer properties, but if such a material is used, the corrosion resistance is inferior, Corrosion caused by the drain is inevitable. In actual use of the heating apparatus, there is a case where well water is introduced into the water pipe. In such a case, there is a problem that the water pipe is corroded due to the components contained in the well water.

  Conventionally, there is a so-called coil type as a large industrial heating device (hot water boiler) (see, for example, Patent Document 2). In this heating device, for example, as shown in FIG. 19, a gun-type burner 90 is provided on an upper portion of a can body 91, and a coiled water pipe 92 for heat exchange is provided in the can body 91. It has a configuration. The inner region of the water pipe 92 is a combustion chamber 93. In this heating apparatus, since the coiled water pipe 92 surrounds the combustion chamber 93, the combustion gas generated by the burner 90 directly acts on the water pipe 92. Therefore, the efficiency of heat exchange can be made higher than that of the traditional heating device described above.

  However, in the heating device shown in FIG. 19, no drain countermeasure is taken, and the drain adhering to the water pipe 92 drops on the bottom of the can 91 to contaminate and corrode this portion. In the heating device, the combustion chamber 93 is surrounded by a water pipe 92, and the amount of drain generated when the combustion gas touches the water pipe 92 becomes very large. Unlike industrial use, for example, in a general household heating apparatus, it is necessary to sufficiently consider the hygiene aspect of the apparatus, and therefore the heating apparatus is not suitable for such general household use.

  In the heating device, ideally, the combustion gas in the combustion chamber 93 passes through the gap 92 a between the water pipes 92 and then passes through the gap 95 between the water pipe 92 and the side wall of the can 91. 94 is reached. However, in reality, most of the combustion gas sent downward from the burner 90 passes through the lower opening of the spiral water pipe 92 as it is and reaches the bottom of the can 91. Therefore, the combustion gas does not actively pass through the gap 92a of the water pipe 92, and the amount of the combustion gas passing through the gap 92a is small, so the efficiency of heat exchange is not so good. Further, the burner 90 is directed downward, whereas the bottom of the can 91 is closed, and the exhaust tube 94 is connected to the top of the can 91. For this reason, the gas that has been sent downward from the burner 90 and reached the bottom of the can 91 is continuously pressed by the combustion gas sent downward from the burner 90 and rises smoothly to the exhaust tube 94. hard. As a result, the old combustion gas continues to stay in the can 91, and heat exchange using the high-temperature combustion gas generated one after another by the burner 90 is not performed effectively, and the efficiency of heat exchange is lower. It was a thing.

Japanese Patent Laid-Open No. 11-23067 Japanese Utility Model Publication No. 55-127944

  The present invention has been conceived under such circumstances, and it is possible to increase the efficiency of heat exchange while simplifying and reducing the size of the entire structure. It is an object of the present invention to provide an instantaneous heating device and a hot water supply device that can appropriately solve the problem of being contaminated by the water.

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

  An instantaneous heating device provided by the first aspect of the present invention includes a combustor whose fuel combustion direction is downward, a can body having a peripheral wall portion surrounding a combustion chamber below the combustor, and the can body A hot water supply apparatus comprising: a heat exchanging water pipe having a coiled tubular body portion including a plurality of loop portions arranged in the vertical direction, and an exhaust passage connected to the can body. And a drain processing means which is located below the coiled tube part and receives a drain from the coiled tube part and discharges it to the outside of the can body and the exhaust passage. .

  According to such a configuration, the following effects can be obtained.

  First, the drain generated by the contact between the combustion gas and the coiled tubular part of the water pipe falls down along the coiled tubular part, and a drain treatment means is provided at that position. Therefore, after the drain is reliably received by the drain processing means, it can be appropriately discharged to the outside of the can body and the exhaust passage. Accordingly, it is possible to appropriately prevent the lower part of the can body and the inside of the exhaust passage from being contaminated by the drain and becoming unsanitary or causing corrosion.

  Secondly, in the present invention, the combustion method of the combustor is a so-called reverse combustion method, and the combustion gas is sent downward from the combustor, and at this time, this combustion gas adheres to the coiled tube portion. The drain is positively flowed downward and dropped on the drain processing means. Therefore, an effect of promoting the recovery of the drain is also obtained.

  Thirdly, the drain treatment means is not provided in the course of the combustion gas from the combustor to the coiled tubular body portion of the water tube, and the combustion gas reaches the place where the drain treatment means is provided. The coiled tubular body portion is brought into contact with the coil-shaped tube body before this. Therefore, the amount of heat transfer from the combustion gas to the coiled tube portion can be increased, and the efficiency of heat exchange can be increased.

  Fourthly, the amount of heat transfer to the coiled tube part can also be increased by adopting a configuration in which the combustion region of the fuel by the combustor is surrounded by the coiled tube part of the water tube. For this reason, the efficiency of heat exchange is further improved. Therefore, it is suitable for reducing the size of the entire apparatus, reducing the manufacturing cost, and saving energy. Furthermore, in the present invention, it is not necessary to use a finned tube as the water tube, and since the efficiency of heat exchange is good, the material of the water tube is made of, for example, stainless steel, which is suitable for a device having excellent corrosion resistance. It is.

  Fifth, the coiled tube portion of the water tube has a configuration in which a plurality of loop portions are arranged in the vertical height direction, and thus the coiled tube portion has a loop shape in plan view. Therefore, as the drain processing means, for example, the shape of the portion that receives the drain can be formed in a loop in a plan view similar to the coiled tube portion, and the size of the drain processing means itself can be reduced. it can. In addition, if the size can be reduced in this way, a passage for allowing the combustion gas to pass therethrough when the exhaust gas is exhausted by passing the combustion gas below the can body is provided. It is also easy to form.

  In a preferred embodiment of the present invention, the drain processing means includes a drain receiver having a concave portion opened upward to receive the drain from the coiled tube body portion, and the drain receiver includes the can It has an opening for circulating the combustion gas that has traveled below or below the body toward the exhaust passage. According to such a configuration, the drain can be appropriately received by the drain receiver, and the combustion gas can be appropriately discharged to the exhaust passage using the opening.

  In a preferred embodiment of the present invention, the drain processing means includes a drain receiver having a concave portion opened upward to receive the drain from the coiled tube body portion, and the drain receiver has an outer periphery around the drain receiver. Is formed with a flow path for allowing the combustion gas that has traveled below or below the can body to flow toward the exhaust passage. Even with such a configuration, it is possible to appropriately receive the drain and allow the combustion gas to flow out into the exhaust passage as in the above-described configuration.

  In a preferred embodiment of the present invention, the coiled tube part has a structure in which a gap for allowing combustion gas to pass between the plurality of loop parts is formed, and the coiled tube Between the outer periphery of the body part and the peripheral wall part of the can body, a combustion gas passage is formed in which the combustion gas that has passed through the gap flows from the inner region of the coiled tube part, and the exhaust gas The passage is connected to the lower part of the can body so as to communicate with the combustion gas passage. According to such a configuration, the combustion gas flows from the inner region of the coiled tube portion of the water tube through the gap of the coiled tube portion to the combustion gas passage, and then the combustion gas passage is directed downward. After traveling, it flows out into the exhaust passage. For this reason, the old combustion gas does not stay in the can body, and the combustion gas generated one after another by the drive of the combustor flows smoothly through the can body through a fixed path, so that the high temperature combustion gas is removed. It can be made to contact efficiently with the coiled tube portion of the water tube. Further, in the above-described configuration, in the course of the flow of the combustion gas, in addition to the passage of the combustion gas through the gap of the coiled tube body portion, the combustion gas flows downward in the combustion gas passage on the outer periphery of the coiled tube body portion. In some cases, heat is transferred from the combustion gas to the water pipe. Therefore, the efficiency of heat exchange is further improved.

  In a preferred embodiment of the present invention, the combustion gas passes through the lower opening from the inner area of the coiled tube portion to the inner region or the lower opening of the coiled tube portion. A combustion gas stopper is provided to suppress this. According to such a configuration, substantially the entire amount of the combustion gas generated by the combustor passes through the gap between the coiled tube portions. Therefore, the efficiency of heat exchange can be further increased.

  In a preferred embodiment of the present invention, the coiled tube portion is formed by a flat tube having a width larger than a thickness. According to such a configuration, when the combustion gas passes through the gap between the coiled tube portions, the amount of heat transmitted to the coiled tube portions increases, and the efficiency of heat exchange is further enhanced. . Moreover, since the thickness of the said tube is small, the height of a coil-shaped tube part can be made small and the further size reduction of the whole hot-water supply apparatus can also be achieved.

  In a preferred embodiment of the present invention, at least a part of the flat tube is inclined so that its height decreases as the gas advances through the gap in the direction in which the combustion gas passes. According to such a configuration, dripping the drain attached to the coiled tube portion onto the drain processing means is facilitated, and the drain recovery rate can be increased.

  In preferable embodiment of this invention, the said water pipe is comprised including the 1st and 2nd pipe body module, and each of the said 1st and 2nd pipe body modules is comprised in the said can body. A common chamber for connecting a tubular body to which one end of the first tubular body module is connected, and water that enters the first tubular body module from the other end passes through the first tubular body module and the common body. After flowing into the chamber, the second tube module is configured to enter water from one end thereof. According to such a configuration, the water pipe is not constituted by a single tube, and the water pipe is constituted by using the first and second tubular body modules formed separately. This is particularly advantageous when the total length of the water pipe is increased. Further, the first and second tubular modules are rationally connected using a common chamber, and the connection can be easily and appropriately performed.

  In a preferred embodiment of the present invention, the can body has a water inlet chamber having a water inlet for allowing water to enter from the outside, and a hot water outlet chamber having a hot water outlet for performing hot water to the outside. Are provided, and a plurality of the first and second tube modules are provided, and one end of each of the plurality of first and second tube modules is provided in the common chamber. The other end portions of the plurality of first tube modules are connected to the water inlet chamber, and the other end portions of the plurality of second tube modules are connected to the water inlet chamber. Connected to the hot water chamber. According to such a configuration, when water is introduced from the water inlet, the water passes through each of the plurality of first tube modules from the water inlet chamber and flows into the common chamber, and then from the common chamber. Each of the plurality of second tube modules passes through the hot water discharge chamber and is discharged from the hot water outlet. As understood from this, according to the above configuration, water can be smoothly and rationally supplied to the plurality of first and second tube modules.

  The hot water supply apparatus provided by the second aspect of the present invention includes the instantaneous heating apparatus provided by the first aspect of the present invention.

  According to such a configuration, the same effect as described for the instantaneous heating device 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.

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

  1 to 6 show an embodiment of the present invention. As clearly shown in FIG. 1, the hot water supply apparatus of the present embodiment includes an instantaneous heating device A, which includes the combustor 1, the heat exchanger HT, and the drain. A receiver 3, an exhaust duct 4, and a control unit 5 are provided.

  The combustor 1 is a so-called reverse combustion burner that burns the vaporized gas downward using, for example, kerosene as a fuel, and is disposed above or above the heat exchanger HT. On the heat exchanger HT, a substantially box-shaped can body 10 having an open bottom is connected, and the combustor 1 is supported by the can body 10. A blower fan 11 that supplies combustion air from above to the combustor 1 is provided on the upper portion of the can body 10. This downward blowing action by the blower fan 11 is useful for causing the combustion gas to travel downward in a fixed path in the heat exchanger HT and then exhausting it outside via the exhaust duct 4. On the can 10, there is also provided a fuel supply device 12 that can supply fuel to the combustor 1 and adjust its supply amount. The control unit 5 is configured by a microcomputer including a CPU and a memory attached thereto. Although details are omitted, the control unit 5 determines the number of combustion of the combustor 1 according to a certain condition, and supplies the fuel so that the combustor 1 can be driven with the determined number of combustion. The fuel supply amount control from the device 12 to the combustor 1 and the rotation speed control of the motor M of the blower fan 11 are performed.

  The heat exchanger HT has a can body 2 and a water tube 6 for heat exchange, both of which are made of stainless steel. Incidentally, in this instantaneous heating device A, the drain receiver 3, a combustion gas stopper 19 described later, and the spacer 18 are also made of stainless steel. However, it is needless to say that other members or parts of the instantaneous heating device A may be made of stainless steel.

  The can body 2 of the heat exchanger HT is connected to the lower part of the can body 10 of the combustor 1, and has a cylindrical peripheral wall portion 20 surrounding the combustion chamber 13. The can body 2 includes a water inlet chamber 21 having a water inlet 21a, a hot water outlet chamber 22 having a hot water outlet 22a, and a common chamber 23 as header portions for connecting the water pipe 6. These chambers 21 to 23 are formed, for example, by welding an appropriate casing member to the outside of the peripheral wall portion 20. A specific connection structure between the chambers 21 to 23 and the water pipe 6 will be described later.

  The water pipe 6 is disposed in the can body 2 and has a coiled pipe body portion 60 in which a plurality of loop portions 60a are arranged with a gap 61 in the vertical height direction of the instantaneous heating device A. . The combustor 1 is located above the inner region of the coiled tube part 60, and the upper and lower sides are located between the outer periphery of the coiled tube part 60 and the peripheral wall part 20 of the can body 2. A combustion gas passage 24 extending in the height direction is formed. As shown in FIG. 2, the loop portion 60 a of the coiled tubular body portion 60 is substantially annular, whereas the peripheral wall portion 20 of the can body 2 is substantially cylindrical, and the combustion gas passage 24 is viewed in plan view. The width s15 at each location is substantially uniform. In this way, it is possible to equalize the flow rate and flow velocity of the combustion gas at various locations in the circumferential direction of the combustion gas passage 24. However, instead of such a configuration, the peripheral wall portion 20 is, for example, approximately half It may be formed in a cylindrical shape or a rectangular tube shape.

  The water pipe 6 is configured by providing a plurality of modular pipe body modules 62 in a plurality of stages in the can body 2. More specifically, as shown in FIG. 3, the tube module 62 has, for example, a portion in which five stages of loop portions 60a are arranged in a vertical direction with gaps 61 of appropriate dimensions arranged at both ends. The parts 62a and 62b have a configuration in which a connection plug 62c is provided. The five-stage loop portion 60a has a spiral shape. Therefore, the gap 61 formed between them is also connected in a spiral shape, and is formed in a plurality of stages. The tube module 62 is formed of a flat stainless steel tube having a width s1 larger than the thickness t over the entire length area excluding the place where the connection plug 62c is provided. As an example of these specific numerical values, the thickness t is about 5 mm, and the width s1 is about 25 mm.

  As shown in FIG. 4, for example, four pipe modules 62 (62 </ b> A to 62 </ b> D) are stacked in the vertical direction in the water pipe 6, and one end 62 a thereof is connected to the common chamber 23 and supported. It has a configuration. The number of tube modules 62 is four for convenience of explanation, and it goes without saying that the specific number is not limited. The other end portions 62b of the two lower tube modules 62C and 62D are connected to and supported by the water inlet chamber 21, while the other two tube modules 62A and 62B on the upper tube The end 62b is connected to and supported by the hot water discharge chamber 22. Accordingly, the water that has entered from the water inlet 21a passes through the two pipe modules 62C and 62D from the water inlet chamber 21 and flows into the common chamber 23, and then has one end 62a in the two pipe modules 62A and 62B. From the hot water outlet 22a and supplied to a desired hot water supply destination.

  As clearly shown in FIG. 5, a combustion gas stopper 19 and a plurality of spacers 18 are provided in the heat exchanger HT. The combustion gas stopper 19 is for closing the lower opening 63 of the coiled tube portion 60 of the water pipe 6, and has, for example, a disk shape corresponding to the shape and size of the lower opening 63. As means for attaching the combustion gas stopper 19, for example, means for welding the combustion gas stopper 19 to the water pipe 6 can be used. As another means, for example, a means for supporting the combustion gas stopper 19 using an appropriate stay (not shown) attached to the bottom of the can body 2 or the drain receiver 3 can be used. The outer peripheral edge of the combustion gas stopper 19 and the upper surface in the vicinity thereof are inclined surfaces 19 a that increase in height toward the center of the combustion gas stopper 19. According to such a configuration, when the outer peripheral edge of the combustion gas stopper 19 is attached in contact with the coiled tube body 60, a drain is formed on the combustion gas stopper 19 from the coiled tube body 60. It can be prevented from flowing in. In the present invention, instead of or in addition to such a configuration, a drain removal hole (a large amount of combustion gas is formed in the connecting portion between the combustion gas stopper 19 and the coiled tube body 60). A small hole that is not allowed to pass through is preferable.

  As shown in FIG. 6, each spacer 18 has a configuration in which, for example, a plurality of flat-plate-like projecting portions 18 b are provided on the front portion of a long rectangular base portion 18 a. The spacer 18 can be manufactured by, for example, metal cutting or welding of a plurality of metal plates. Further, the metal plate can be formed by so-called cutting and raising processing, but a specific example thereof will be described later. As shown in FIG. 5, in each spacer 18, a plurality of protrusions 18b are inserted into a plurality of gaps 61 in the coiled tube body 60, whereby the gaps 61 have the same thickness as the protrusions 18b. It is specified in the dimensions. The thicknesses of the plurality of protrusions 18b are the same, and as a result, the dimensions s2 of the plurality of gaps 61 are also the same in each place. However, as described later, the dimension of the gap 61 may be different. As described above, the thickness t of the water pipe 6 is, for example, about 5 mm, while the dimension s2 of the gap 61 is, for example, about 0.8 mm to 2.0 mm. As clearly shown in FIG. 2, the plurality of spacers 18 are provided at substantially equal intervals, for example, at three locations on the outer periphery of the coiled tube body 60. As a means for ensuring the attachment of the spacers 18, the spacers 18 may be fixed by welding to appropriate portions in the coiled tube portion 60 or the can body 2. The width of each spacer 18 is considerably smaller than the circumferential length of the loop portion 60a, and a portion of the gap 61 where each spacer 18 is not provided can pass a sufficient amount of combustion gas. Open as possible.

  As clearly shown in FIG. 1, the drain receiver 3 is provided below the coiled tube portion 60 of the water pipe 6. The drain receiver 3 is for receiving a drain adhering to the water pipe 6 as fuel is burned, and has a ring shape in plan view having an opening 30 for allowing combustion gas to pass through in the center. The outer peripheral edge of the drain receiver 3 is welded to the peripheral wall portion 20 of the can body 2, whereby the drain receiver 3 is supported and fixed. The drain receiver 3 has an inclined surface 31 whose height decreases as it approaches the opening 30 from the outer peripheral edge, and a standing wall 32 that rises upward at the inner peripheral edge of the opening 30. The drain is collected in the recess 33 formed by the inclined surface 31.

  A drain extraction pipe 34 for discharging the drain to the outside of the can body 2 and the exhaust duct 4 is connected to the bottom of the recess 33. The combined structure of the pipe 34 and the drain receiver 3 corresponds to an example of the drain processing means in the present invention. In the present embodiment, the drain receiver 3 is formed by a member different from the peripheral wall portion 20 of the can body 2. However, for example, a part of the peripheral wall portion 20 is processed for a portion forming the inclined surface 31. It is also possible to form it integrally with the peripheral wall portion 20. Preferably, the drain passing through the pipe 34 is supplied to a drain neutralization processing apparatus (not shown) containing a neutralizing agent such as limestone, and is neutralized and then discharged to the outside of the apparatus. Yes.

  The exhaust duct 4 forms an exhaust passage 40 for exhausting combustion gas that has passed through the inside of the can body 2 to the outside. One end of the exhaust duct 4 is connected to the bottom of the can body 2. The exhaust duct 4 has a substantially L-shape in a side view as a whole, and a portion near the other end has a form standing on one side of the heat exchanger HT. The exhaust gas is discharged to the outside from an exhaust port 41 provided at the other end in the exhaust duct 4.

  Next, the operation of the hot water supply apparatus configured as described above will be described.

  First, when the combustor 1 is driven while supplying combustion air downward from the blower fan 11, the combustion gas travels downward in the inner region of the coiled tubular part 60, and the coiled tubular part 60. And flows into the combustion gas passage 24. Since the lower opening 63 of the coiled tubular body 60 is blocked by the combustion gas stopper 19, the combustion gas does not pass through the lower opening 63 as it is. Will positively pass through the gap 61.

  Next, the combustion gas that has flowed into the combustion gas passage 24 travels downward in the combustion gas passage 24, passes through the opening 30 of the drain receiver 3, flows out into the exhaust passage 40, and is exhausted from the exhaust duct 4. 41 is discharged to the outside as exhaust gas. Thus, in this hot water supply apparatus, the combustion gas smoothly flows in the heat exchanger HT along a fixed path. Accordingly, a part of the combustion gas does not stay in the heat exchanger HT, and new combustion gas generated one after another by driving the combustor 1 is efficiently used for heat exchange in the heat exchanger HT. Can do.

  In the above-described combustion gas flow, first, combustion is performed in the inner region of the coiled tubular body 60, and heat transfer to the coiled tubular body 60 when the combustion gas proceeds downward in the inner region. Is made. Next, heat transfer is also performed when the combustion gas passes through the gap 61 of the coiled tubular body portion 60. The dimension of the gap 61 can be set to an optimum value using the spacer 18 so that heat transfer is performed satisfactorily. Moreover, since the width s1 of the tube constituting the coiled tube body 60 is large, the contact time between the coiled tube body 60 and the combustion gas when the combustion gas passes through the gap 61 is lengthened, and the coiled tube The amount of heat transfer to the body part 60 can be further increased. Even when the combustion gas passes downward through the combustion gas passage 24, the combustion gas performs heat transfer to the coiled tube body 60. For this reason, the efficiency of heat exchange in the instantaneous heating device A is very high, and the hot water supply capacity is improved. Along with this, the overall size and energy saving can be achieved.

  In the heat exchanger HT of the instantaneous heating device A, the efficiency of heat exchange is sufficiently increased without using a finned tube as the water tube 6, and the structure of the water tube 6 is simple. Therefore, although the heat exchanger HT is made of stainless steel, the manufacturing cost can be made relatively inexpensive. Since the water pipe 6 is formed by using a plurality of pipe modules 62 whose shapes and sizes are unified, for example, when compared with a case where a water pipe in which one pipe body is formed in a continuous spiral shape is used, The manufacturing cost can be reduced. Further, according to the method of configuring the water pipe 6 using a plurality of pipe modules 62, it is possible to easily change the total length or capacity of the water pipe 6 by changing the number of the pipe modules 62. Changing the specifications of the instantaneous heating device A is also easy.

  The combustion gas generates many drains when it contacts the coiled tube part 60 and exchanges heat. The drain that adheres to the coiled tube part 60 and drops down is caused by the drain receiver 3. It is appropriately received and discharged to the outside through the pipe 34. Accordingly, the bottom of the can body 2 and the exhaust passage 40 are not contaminated by the drain. The flow of the combustion gas acts to move the drain attached to the coiled tube part 60 downward and to positively drip from the coiled tube part 60. Therefore, by this action, the recovery rate of the drain can be increased, so that a large amount of the drain remains and does not remain attached to the coiled tube portion 60. In addition, since the material of the parts such as the drain receiver 3 and each part of the heat exchanger HT that may be in contact with the drain is made of stainless steel, these parts are easily corroded by contact with the acidic drain. There is nothing. Moreover, in this instantaneous heating device A, since the water pipe 6 is made of stainless steel, it is possible to use well water containing components that cause corrosion of many metals such as copper by entering the water pipe 6. Therefore, the usage is wide.

  As described above, the coiled tube part 60 is not a finned tube but is formed by a flat tube having a small thickness t, and thus the entire height of the coiled tube part 60 is large and bulky. The amount of water in the water pipe 6 can be increased by increasing the number of the loop parts 60a of the coiled tubular body part 60 while suppressing the above. Further, since the flat tube has a large width s1, the amount of water can be increased.

  7 to 18 show other embodiments of the present invention. In these drawings, elements that are the same as or similar to those in the above embodiment are given the same reference numerals as in the above embodiment.

  In the configuration shown in FIG. 7, the drain receiver 3 </ b> A is common to the drain receiver 3 described above in that the drain receiver 3 </ b> A is formed in a ring shape in plan view having an opening 30 at the center. The standing wall 35 is provided, and the standing wall 35, the standing wall 32 on the inner peripheral edge, and the inclined surface 31 form a recess 33. The standing wall 35 is separated from the peripheral wall portion 20 of the can body 2, and a gap portion 30 a as a combustion gas flow path is formed between them. The drain receiver 3A is supported by using an appropriate stay (not shown) welded to the can 2 or the exhaust duct 4.

  According to the above configuration, the combustion gas that has flowed downward through the combustion gas passage 24 passes through the opening 30 or the gap 30 a and flows into the exhaust passage 40. Therefore, for example, when the drain receiver 3A is brought close to the coiled tubular body 60 and the distance s20 between them is made very small for the purpose of reducing the overall height of the apparatus, the combustion gas is opened. Even if a phenomenon that makes it difficult to pass through the portion 30 occurs, the combustion gas can be smoothly discharged using the gap portion 30a.

  In the configuration shown in FIG. 8, the drain receiver 3B does not have an opening for passage of combustion gas in the central portion, and the standing wall 35 at the outer peripheral edge and the bottom plate portion 31a inclined so as to be lowered toward the center. Thus, a recess 33 is formed. A gap 30 a is formed between the standing wall 35 and the peripheral wall 20 of the can body 2.

  According to such a configuration, although the combustion gas that has passed through the combustion gas passage 24 passes only through the gap 30a and flows into the exhaust passage 40, the combustion gas can be discharged smoothly as in the above-described embodiment. It can be done.

  In the configuration shown in FIG. 9, the drain receiver 3C and the combustion gas stopper 19 are integrally formed. According to such a configuration, the assembly work of the hot water supply apparatus can be facilitated by reducing the number of parts.

  In the configuration shown in FIG. 10, the combustion gas stopper 19 is disposed above the lower opening 63 of the coiled tubular body 60, and the combustion gas proceeds further downward at the disposed position. A part of the inner region of the coiled tube portion 60 is blocked so as not to occur. Thus, in this invention, it can also be set as the structure by which the lower opening part 63 of the coil-shaped tube part 60 is not obstruct | occluded directly by the stopper 19 for combustion gases.

  In the configuration shown in the figure, a combustion gas stopper 29 for closing the bottom of the combustion gas passage 24 is provided at the lower portion of the peripheral wall portion 20 of the can body 2. This combustion gas stopper 29 has a ring shape and has an inclined surface 29a whose height decreases toward the center of the can body 2 in the radial direction. The drain receiver 3 </ b> A is provided so as to be positioned below the coiled tube body 60 in the exhaust passage 40.

  According to such a configuration, in the coiled tube portion 60, the upper region BL1 above the combustion gas stopper 19 is used for primary heat exchange, and the lower region BL2 below it is used for secondary heat exchange. Can be used. More specifically, the combustion gas generated by the combustor 1 flows from the inner region of the coiled tube body 60 through the gap 61 in the upper region BL1 to the combustion gas passage 24, and then in the lower region BL2. It passes through the gap 61 and flows out into the exhaust passage 40. In the lower region BL2, it is possible to recover the latent heat of the combustion gas, and it is possible to further increase the efficiency of heat exchange. The combustion gas stopper 29 plays the role of guiding the dropping of the combustion gas toward the drain receiver 3A in addition to the role of guiding the combustion gas to the lower region BL2.

  In the above-described configuration, when the water pipe 6 is filled with water, the water temperature in the lower region BL2 can be increased by allowing water to enter from the lower region BL2 and allowing water that has passed through the lower region BL2 to enter the upper region BL1. By making it low, the drain can be concentrated in the lower region BL2. In this way, an effect that the drain is easily collected by the drain receiver 3A is obtained.

  In the configuration shown in FIG. 11, the flat tube constituting the water pipe 6 is inclined in the radial direction of the loop portion 60a. This inclination corresponds to the direction in which the combustion gas passes through the gap 61, and the height of the flat tube decreases as the combustion gas advances. More specifically, the loop portion 60a is inclined so that the outer peripheral edge is lower than the inner peripheral edge.

  According to such a configuration, when the combustion gas passes through the gap 61, an action of moving the drain where the combustion gas adheres to the loop portion 60a in a direction in which the height of the loop portion 60a is lowered can be obtained. Therefore, the dripping of the drain from the loop portion 60a onto the drain receiver 3 (3A) is promoted, and it is more preferable to increase the drain recovery rate. In addition, when the flat tube constituting the water pipe 6 is inclined as in the present embodiment, it is preferable to incline at all locations of the multiple-stage loop portion 60a. It is also possible to adopt a configuration in which only a part of the loop portion 60a is inclined. Even in such a configuration, dripping of the drain is promoted in that portion, and the drain recovery rate can be increased. However, in that case, it is preferable to incline at least the flat tube of the lowermost loop portion 60a. This is because drain dripping from the coiled tube portion 60 to the drain receiver 3 (3A) is almost always performed in the lowermost loop portion 60a.

  The configuration shown in FIG. 12 is a so-called one-can two-circuit system in which one water pipe 6A and two water pipes 6B with different hot water supply destinations are provided as water pipes. The water pipe 6A is for hot water supply to the kitchen, for example, whereas the water pipe 6B is for bath hot water supply, for example. The loop part 60a 'of the water pipe 6A is sandwiched between and directly in contact with the loop parts 60a "of the two water pipes 6B. In this embodiment, a total of three loop parts 60a', 60a" are included. A pair 61 is formed, and a gap 61 for allowing combustion gas to pass between the sets is formed. As clearly shown in FIG. 6B, the header for connecting the water pipe is a water inlet chamber for connecting both ends 62a ′ and 62b ′ of the plurality of tube modules 62 constituting the water pipe 6A. 21A, a hot water discharge chamber 22A, and a common chamber 23A are provided. Further, a water inlet chamber 21B, a hot water discharge chamber 22B, and a common chamber 23B for connecting both ends 62a "and 62b" of the plurality of tube modules 62 constituting the water pipe 6B are also provided. This prevents the water flowing through the water pipes 6A and 6B from mixing with each other.

  According to such a configuration, for example, when only hot water is supplied to the kitchen, water is passed only to the water pipe 6A while the combustor 1 is driven, and the water in the water pipe 6B remains stagnant. Therefore, although the water in the water pipe 6B may be heated and boiled originally, heat transfer is performed between the water pipes 6A and 6B in the present embodiment, so that the boiling is appropriately prevented. Is done. Contrary to the above, even when water is passed only through the water pipe 6B, boiling in the water pipe 6A is similarly prevented. Since each of the water tubes 6A and 6B is formed of a flat tube, an effect of increasing the contact area (heat transfer area) can also be obtained. In addition, in the one-can two-circuit system as seen in the present embodiment, water is poured into each of the two types of water pipes, for example, there are cases where both the kitchen and the bath must be tapped, but the moment of the present invention According to the type heating device or hot water supply device, as described above, since the efficiency of heat exchange is high and it is suitable for increasing the amount of hot water, it is optimal for adopting such a one-can two-circuit method. .

  In the configuration shown in FIG. 13, the loop portions 60a 'and 60a "of the two types of water pipes 6A and 6B are paired with each other, are aligned in the radial direction of the coiled tubular body 60, and are in contact with each other. 2B, the structure of the header part for connecting the water pipes 6A and 6B is different from the previous embodiment in the positional relationship of each part, but the basics thereof. In the configuration shown in Fig. 14, the loop portion 60a "of the two water pipes 6B surrounds and contacts the entire circumference of the loop portion 60a 'of the water pipe 6A. In the configuration shown in FIG. 15, a round pipe is used as the water pipe 6 </ b> A, and the water pipe 6 </ b> B has a cross-sectional shape that surrounds and contacts a substantially half-circumferential region of the water pipe 6 </ b> A. As can be understood from these embodiments, various modes can be adopted when a plurality of types of water pipes are brought into contact with each other. However, as the contact area increases, the effect of preventing the boiling of water in an unused water pipe by increasing the amount of heat transfer increases, and thus such a configuration is desired.

  In the configuration shown in FIG. 16, the water pipes 6A and 6B have a double pipe structure in which the water pipe 6A is disposed inside the water pipe 6B. Since it is necessary to separately enter the water pipes 6A and 6B, the water inlet chambers 21A and 21B, the hot water outlet chambers 22A and 22B, and the common chambers 23A and 23B for connecting both ends thereof are also provided. It has a double structure.

  According to such a configuration, although the two water pipes 6A and 6B are not in direct contact with each other, since water is interposed between them, heat transfer occurs between the water pipes 6A and 6B. . Therefore, even when only one of the water pipes 6A and 6B is used to perform hot water discharge, boiling of the water on the other side can be prevented. The present invention may have such a double tube structure or a multi-tube structure having more than that.

  In the configuration shown in FIG. 17, a convex portion 69 is provided on the outer surface of the loop portion 60 a of the coiled tubular body portion 60 of the water tube 6. The adjacent loop portions 60 a in the vertical height direction are in contact with each other via the convex portion 69.

  According to such a configuration, it is possible to form a gap 61 having a desired dimension between the loop portions 60a using the convex portion 69. Therefore, it is not necessary to use a spacer, and the spacer mounting operation is not necessary, so that the manufacturing operation of the hot water supply device is facilitated. However, in the present invention, the size of the gap 61 of the water pipe 6 does not necessarily have to be defined using such convex portions 69 and spacers 18. In the present invention, the dimensions of the plurality of gaps 61 of the coiled tubular body 60 need not be constant everywhere. For example, the gap 61 may be reduced in the portion where the temperature of the combustion gas is high. In addition to this, or separately from this, it is possible to increase the amount of heat transfer to the water pipe 6 by increasing the width of the loop portion 60a as the temperature of the combustion gas is higher.

  In the configuration shown in FIG. 18, except for the uppermost and lowermost two end portions 62b of the tube modules 62A to 62D, the other end portions 62a adjacent to each other in the vertical direction and the end portions 62b are connected to each other. ing.

  According to such a configuration, for example, when water is introduced from the lowermost end 62b, the water is continuously raised from the bottom to the top in the order of the tube modules 62D, 62C, 62B, 62A. Eventually, it can be discharged from the uppermost end 62b. Therefore, it is possible to conduct water in a manner similar to that in which the water pipe 6 is constituted by one spiral tube, and the time during which water flows through the water pipe 6 and is heated can be extended. In the present invention, such a structure may be used.

  The present invention is not limited to the embodiment described above. The specific configuration of each part of the instantaneous heating device and the hot water supply device according to the present invention can be varied in design in various ways.

  The drain processing means is not limited to a structure in which a drain discharge tube is connected to the drain receiver. For example, a structure is adopted in which the drain receiver is entirely or partially inclined and when the drain drops on the drain receiver, the drain flows on the drain receiver and is discharged to the outside of the can body and the exhaust passage. It doesn't matter.

  The combustor may be of a so-called reverse combustion type, and various types of combustors can be used. The specific type of fuel and the manner of combustion are not questioned. The can body and water pipe of the heat exchanger and the drain receiving means are preferably made of stainless steel having excellent corrosion resistance, but can be made of other materials.

  The water pipe may be configured by, for example, a single spiral tube or by directly connecting a plurality of spiral tubes instead of using a plurality of tube modules. . Further, for example, a tube having a circular cross section may be used as the material of the water tube.

  The instant heating device according to the present invention can be used as a heating source for a bath and a heating device (for example, floor heating) in addition to being used as a heating source for an instantaneous hot water supply device. is there.

It is a schematic sectional drawing which shows typically one Embodiment of the hot water supply apparatus which concerns on this invention. It is II-II sectional drawing of FIG. (A) is a top view which shows an example of the tube module which comprises the water pipe for heat exchange, (b) is the front view. It is principal part sectional drawing of the hot-water supply apparatus shown in FIG. It is VV sectional drawing of FIG. It is a partially-omission perspective view which shows an example of the spacer used for the hot water supply apparatus shown in FIG. It is principal part sectional drawing which shows other embodiment of the hot-water supply apparatus which concerns on this invention. It is principal part sectional drawing which shows other embodiment of the hot-water supply apparatus which concerns on this invention. It is principal part sectional drawing which shows other embodiment of the hot-water supply apparatus which concerns on this invention. It is principal part sectional drawing which shows other embodiment of the hot-water supply apparatus which concerns on this invention. It is principal part sectional drawing which shows other embodiment of the hot-water supply apparatus which concerns on this invention. (A) is principal part sectional drawing which shows an example of the structure which contacts the multiple types of water pipe for heat exchange, (b) is the principal part top sectional drawing. (A) is principal part sectional drawing which shows the other example of the structure which contacts the multiple types of water pipe for heat exchange, (b) is the principal part plane sectional drawing. It is principal part sectional drawing which shows the other example of the structure which contacts the multiple types of water tube for heat exchange. It is principal part sectional drawing which shows the other example of the structure which contacts the multiple types of water tube for heat exchange. (A) is principal part sectional drawing which shows the example which made the water pipe for heat exchange into the double pipe body structure, (b) is the partially broken plane sectional drawing. (A) is principal part sectional drawing which shows the other example of the water pipe for heat exchange, (b) is a principal part left side part of (a). It is principal part sectional drawing which shows the other example of the connection structure of a tubular body module. It is principal part sectional drawing which shows an example of a prior art.

Explanation of symbols

A Instantaneous heating device HT Heat exchanger 1 Combustor 2 Can body 3, 3A to 3D Drain receiver 4 Exhaust duct 5 Control unit (control means)
6 Water pipe 13 Combustion chamber 19 Stopper for combustion gas 20 Peripheral wall (can body)
DESCRIPTION OF SYMBOLS 21 Water inlet chamber 21a Water inlet 22 Hot water outlet 22a Hot water outlet 23 Common chamber 24 Combustion gas passage 34 Piping 40 Exhaust passage 60 Coiled tubular part 61 Crevice 60a Loop part 62 Tubular module 63 Lower opening (coiled tubular body) Part)

Claims (10)

A combustor whose fuel combustion direction is downward,
A can having a peripheral wall surrounding the combustion chamber below the combustor;
A water tube for heat exchange having a coiled tube portion including a plurality of loop portions arranged in the vertical direction in the can body;
An exhaust passage connected to the can body;
An instantaneous heating device comprising:
A drain processing means located below the coiled tube part and receiving a drain from the coiled tube part and discharging it to the outside of the can body and the exhaust passage, Type heating device. The drain processing means includes a drain receiver having a concave portion opened upward to receive the drain from the coiled tube portion,
2. The instantaneous heating device according to claim 1, wherein the drain receiver has an opening for allowing the combustion gas that has traveled below or below the can body to flow toward the exhaust passage. The drain processing means includes a drain receiver having a concave portion opened upward to receive the drain from the coiled tube portion,
2. The instantaneous heating according to claim 1, wherein a flow path is formed around the outer periphery of the drain receptacle to allow the combustion gas that has traveled below or below the can body to flow toward the exhaust passage. apparatus. The coiled tube portion has a structure in which a gap for allowing combustion gas to pass between the plurality of loop portions is formed,
Between the outer periphery of the coiled tube part and the peripheral wall part of the can body, a combustion gas passage through which the combustion gas that has passed through the gap flows from the inner region of the coiled tube part is formed. And
The instantaneous heating device according to any one of claims 1 to 3, wherein the exhaust passage is connected to a lower portion of the can body so as to communicate with the combustion gas passage.   A combustion gas stopper is provided in the inner region or lower opening of the coiled tube portion to suppress combustion gas from passing through the lower opening from the inner region of the coiled tube portion. The instantaneous heating device according to claim 4, which is provided.   The instantaneous heating device according to claim 4 or 5, wherein the coiled tube portion is formed by a flat tube having a width larger than a thickness.   The instantaneous heating device according to claim 6, wherein at least a part of the flat tube is inclined such that the height thereof decreases as the gas passes through the gap in the direction in which the combustion gas passes. The water pipe is configured to include first and second tube modules,
The can body is provided with a common tube connecting tube body to which one end of each of the first and second tube modules is connected,
The water that has entered the first tube module from the other end passes through the first tube module, flows into the common chamber, and then enters the second tube module from one end thereof. The instantaneous heating device according to claim 1, which is configured as described above. The can body is further provided with a water inlet chamber having a water inlet for allowing water to enter from the outside, and a hot water outlet chamber having a hot water outlet for allowing hot water to be discharged to the outside,
A plurality of the first and second tube modules are provided,
One end of each of the plurality of first and second tube modules is connected to the common chamber, while the other end of each of the plurality of first tube modules is connected to the water inlet chamber. The instantaneous heating device according to claim 8, wherein each other end portion of the plurality of second tube modules is connected to the hot water discharge chamber.   A hot water supply device comprising the instantaneous heating device according to any one of claims 1 to 9.

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