JP2006162204A - Heat exchanger for water heater - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat exchanger for a water heater capable of efficiently carrying out heat exchange between different types of fluids by using a plurality of metal circular tubes, and freely and properly combining overall lengths, outer diameters, inner diameters, quantity, contact positions, or the like. <P>SOLUTION: The heat exchanger comprises a plurality of metal circular tubes with different diameters adhered to each other throughout overall lengths, and it is composed such that a primary side fluid such as CO<SB>2</SB>is passed through the several circular tubes, and water which is a secondary side fluid is passed through the rest of the circular tubes to carry out heat exchange between the both fluids. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a heat exchanger for a hot water heater, and more particularly to a heat exchanger that performs heat exchange of different fluids.

  In a conventional water heater heat exchanger, 6 to 10 circular tubes for refrigerant are arranged and joined to both ends in the diameter direction of one water circular tube, and adjacent to the direction in which the circular tube for refrigerant is not arranged. By doing so, the area of the multi-stage winding shape is made compact (see, for example, Patent Document 1).

JP 2003-156291 (Page 8, FIGS. 1 and 4)

  In the conventional heat exchanger for hot water heater, the direction in which the refrigerant circular tubes are arranged is the size of three circular tubes, and the occupied space in the allowable space increases. In addition, when the number of circular pipes becomes a large number of seven or more, the circular pipe bending workability, assemblability, and jointability deteriorate, making it difficult to secure a shape that can be mounted in an allowable space, which is important for improving the performance as a heat exchanger. It is not easy to secure the heat exchange length. Furthermore, since the circular pipe bending workability, assemblability, and bondability are lowered, the processing cost is increased, and there is a problem that a heat exchanger having a good specification cannot be obtained particularly in the performance vs. cost comparison.

  The present invention has been made to solve the above-described problems. The first object is to use a plurality of metal circular tubes, and freely and accurately adjust the overall length, outer diameter, inner diameter, number, contact position, and the like. By combining them, a heat exchanger for a water heater that can efficiently perform heat exchange between different fluids is obtained.

  A second object is to provide a heat exchanger for a heat pump water heater that can efficiently perform heat exchange per volume by mounting a maximum length in an allowable space.

  The third object is to obtain a heat exchanger for a hot water heater that is superior in performance vs. cost due to easy specifications and shape of the manufacturing method.

  The heat exchanger for a hot water heater according to the present invention is composed of a plurality of metal circular tubes of different diameters which are in close contact with each other over the entire length, of which a primary side fluid such as CO2 is provided in several circular tubes and a secondary fluid is provided in the remaining circular tubes. Heat is exchanged between the two fluids by flowing water as a side fluid.

  The heat exchanger for a hot water heater of the present invention is composed of a plurality of metal circular tubes of different diameters closely adhered over the entire length, of which a primary side fluid such as CO2 is provided in several circular tubes and a secondary side is provided in the remaining circular tubes. Since the heat exchange between the two fluids is performed by flowing water, which is a fluid, an accurate circular pipe specification and the number of tubes can be combined, and high-efficiency heat exchange can be achieved.

Embodiment 1 FIG.
1 is an enlarged cross-sectional view showing a hot water supply heat exchange pipe according to Embodiment 1 of the present invention, FIG. 2 is a plan view showing a hot water supply heat exchanger according to Embodiment 1 of the present invention, and FIG. FIG. 4 is a sectional view showing a hot water supply heat exchanger according to Embodiment 1 of the present invention, and FIG. 5 is a hot water supply according to Embodiment 1 of the present invention. FIG. 6 is a side view showing a processing jig device for a hot water supply heat exchanger according to Embodiment 1 of the present invention.

In the figure, a heat exchange pipe 1 includes a water circular pipe 2 (hereinafter referred to as a water circular pipe 2) for flowing water as a secondary fluid and a refrigerant circular pipe 3 (hereinafter referred to as a secondary fluid CO ₂ ) for flowing refrigerant. (Referred to as a refrigerant circular tube 3) is a 1: 2 combination, and is joined over the entire length in the longitudinal direction. The refrigerant circular tube 3 is centered on one side of the water circular tube 2 in a cross-sectional shape. The first refrigerant circular tube 3a is surface-joined at a position of 45 ° with respect to the vertical line passing through, and the second refrigerant circular tube 3b is positioned by shifting the surface of the tube by approximately 90 ° from the 45 ° position. ing.

  In the drawing, the joined heat exchange tube 1 is bent into a multi-stage track winding shape in consideration of mounting in an actual allowable space 4 in a cross-sectional arrangement to form a heat exchanger 5. Since the circular tube for water 2 uses a circular tube having a diameter larger than that of the refrigerant circular tube 3 at a predetermined flow rate that is normally required, the circular tube for water is as shown in the enlarged sectional view of FIG. 2 are connected in parallel, and a concave portion 6 is provided between the water circular tubes 2, and the refrigerant circular tube 3 is arranged in the concave portion 6 between the water circular tubes 2.

  As described above, since the heat exchanger 5 of the first embodiment has the refrigerant circular tubes 3 arranged in a space between the water circular tubes 2, it is possible to ensure that the heat exchange tubes 1 are in close contact with each other. Joining can be done easily. Therefore, it is possible to realize a heat exchanger that is excellent in heat transfer efficiency via the heat exchange pipe 1 and low in processing cost.

  Examples of the bonding method include brazing in a furnace, soldering in a furnace or a dip tank, and adhesive bonding using a thermosetting adhesive containing a heat conductive filler.

  Further, since the refrigerant circular tube 3 on the heat supply side in FIG. 2 is configured in the outermost periphery 5a and the innermost periphery 5b, the heat radiation loss to the outside in the high temperature region of the final part of the water circular tube 2 is reduced. The heat exchanger 5 which can be minimized and has excellent heat exchange efficiency can be realized.

  Moreover, since the circular tube 3 for refrigerant | coolants is arrange | positioned in the recessed part 6 between the circular tubes 2 for water, the occupation rate of the circular tube in a cross section is the highest, and the shape approximated to the flat plate can be ensured. Therefore, it is easy to construct two or more layers to increase the overall length, and heat insulation between each layer can be achieved by simply sandwiching the sheet-like heat insulating material 7 and has excellent space efficiency and high heat exchange performance per volume. An exchanger can be realized.

  FIGS. 5 and 6 show a tool apparatus for bending into the shape of the heat exchanger shown in FIG. On the bending jig body 9, a pair of pipe inner circumference setting tools 9a for regulating the bending R8 of the innermost circumference 5b and a pair of outer tools 9b for regulating the outermost circumference 5a are fixed on the bending jig smoothing portion 9c. And an inner tool 9e for fixing the innermost peripheral end 1a of the heat exchange tube 1 and the final of the heat exchange tube 1 are provided. A split-type holding jig 9g that can hold the end tool 9f that fixes the end 1b on the bending jig smoothing portion 9c and that can sequentially hold the heat exchangers 5 of each stage that has been bent is provided on the lower surface of the upper tool 9d. Provided.

  FIG. 7 is a plan view showing a spiral-shaped hot water supply heat exchanger according to Embodiment 1 of the present invention. In the figure, the heat exchanger 5 has a spiral shape depending on the shape of the actual allowable space 4.

  8 and 9 are a side view and a front view of a heat exchanger bent into a spiral shape in the cross-sectional arrangement of FIG. In the figure, the heat exchanger 5 provided with the refrigerant circular tube 3 positioned in one side of the water circular tube 2 in a cross-sectional shape in the allowable space 4 is formed by bending into a spiral shape.

  FIGS. 10 and 11 are a plan view and a side view showing a helical bending jig tool for bending into the shape of the heat exchanger 5 shown in FIGS. In the figure, the spiral bending tool device 10 includes a rectangular spiral bending tool base 10 a on which the heat exchanger 5 is placed and a spiral tube inner side on four sides of the spiral bending tool base 10 a that is set within the allowable space 4. A holding jig 10c having a holding surface 10b to be brought into close contact with the shape is provided in a standing manner. Then, bending is performed while being wound around a cylindrical tool 10d that regulates the spiral inner diameter of the heat exchanger 5, and the heat exchanger 5 is held in a slide type that can sequentially hold the circular tubes of each stage.

  FIG. 12 is another embodiment of the present invention, and is a side view of a heat exchanger that improves bending workability by disposing all the refrigerant circular tubes 3 on the outer peripheral side of the water circular tube 2. is there.

  FIG. 13 shows another embodiment of the present invention, and is a side view of a heat exchanger in which two combinations of cross-sectional arrangements in FIG. 1 are alternately configured. As a heat exchanger, the number combination of the water circular pipe 2 and the refrigerant circular pipe 3 can be configured to 2: 4. (See Figure 22)

  As described above, in the first embodiment of the present invention, the water circular tube 2 and the refrigerant circular tube 3 are joined in a 1: 2 combination. Next, the water circular tube 2 and the refrigerant circular tube 3 are joined. Another embodiment, which is a case of bonding in a number combination of 1: 1, will be described.

  FIG. 14 is a sectional view of a heat exchanger according to another embodiment of the present invention, and FIG. 15 is an enlarged sectional view of a heat exchanger according to another embodiment of the present invention.

  FIG. 14 shows a cross section in which one refrigerant circular tube 3 is joined to one side of the water circular tube 2. In the drawing, the refrigerant circular tube 3 is at an angle of 45 ° with respect to the center of the tube diameter of the water circular tube 2. The circular tube 3 is joined and formed. As shown in FIG. 15, the refrigerant circular tube 3 can be disposed in the recess 6 between the adjacent water circular tubes 2 as shown in the enlarged sectional view of FIG. 3 of the first embodiment.

  As the effects, as shown in FIG. 22, the assemblability is good, the material cost is small, and the water flow rate is large. Therefore, the present invention can be applied to the heat exchangers of FIGS. 2, 7, 8, 12, and 13 of the first embodiment.

  As described above, the basic shape is the same as that of the heat exchanger shown in Embodiment 1 of the present invention, and the number of circular pipes is reduced. Therefore, the reduction in processing man-hours, diversion of processing equipment, and reduction in material costs are low. A cost heat exchanger can be realized.

  Furthermore, as shown in FIG. 13, two sets of cross-sectional arrangement combinations are configured alternately or sequentially, so that the number of water circular tubes 2 and refrigerant circular tubes 3 can be 2: 2 or 2 as a heat exchanger. 3: 3. (Refer to FIG. 22) Accordingly, the present invention can be similarly applied to the heat exchangers of FIG. 2, FIG. 7, and FIG.

  Further, in another embodiment of the first embodiment of the present invention, each heat exchanger of FIGS. 8, 12, and 13 has a spiral shape, and the case where these are applied will be described.

  FIGS. 16 and 17 are perspective views showing a schematic shape of the heat exchanger when the helical shape is mounted in a rectangular parallelepiped allowable space 4. FIGS. 18 and 19 are front views showing a schematic shape of the heat exchanger when two or more spiral shapes are stacked or double or triple.

  In this case, in FIG. 18, a connecting pipe 5e is provided to increase the overall length, and the first heat exchanger 5c and the second heat exchanger 5d are connected in a vertical direction so as to overlap two or more, and FIG. Then, the 2nd heat exchanger 5d is installed in the inside of the 1st heat exchanger 5c, and it connects and connects with the connecting pipe 5e.

  As described above, a heat exchanger having high heat exchange performance per volume can be realized by making the shape excellent in mountability in a rectangular parallelepiped space.

  20 and 21 show another embodiment of the first embodiment of the present invention, and FIG. 20 shows a partial side view of a heat exchanger according to another embodiment of the first embodiment of the present invention. FIG. 21 is a partial cross-sectional view showing a combination of a plurality of water tubes and refrigerant tubes in a heat exchanger.

  In the figure, a state in which the water circular tube 2 and the refrigerant circular tube 3 are combined in a wire rope shape is shown, and the heat exchanger 5 is configured in this shape over the entire length of the water circular tube 2 and the refrigerant circular tube 3. . As shown in the schematic cross-sectional view of FIG. 21, the combinations of the number of the water circular pipe 2 and the refrigerant circular pipe 3 are (a) 1: 1, (b) 1: 2, (c) 1: 3, (d ) 2: 2 and (e) 2: 4. The shape of the heat exchanger 5 is that of each of the heat exchangers shown in FIGS. 2, 7, 8, 12, 13, 13, 16, 17, 18, 19 as shown in the first embodiment. The shape can be diverted

  As described above, the water circular pipe 2 and the refrigerant circular pipe 3 are combined together over the entire length of the heat exchanger, so that the bending can be easily performed by holding the bent circular pipes at each stage. You can do it. In addition, adhesion of the circular tube can be ensured, and joining by brazing, soldering, an adhesive or the like can be easily performed. Therefore, it is possible to realize a heat exchanger that is excellent in heat transfer efficiency via a circular pipe and is low in processing cost.

  In addition, it is possible to ensure that the tubes are in close contact with each other, and depending on the required heat exchange capability, a joining process using brazing, soldering, adhesive, or the like is not necessary, and a heat exchanger with a lower processing cost is realized. be able to.

  These combinations, tube diameter conditions, and effects of the various water circular tubes and refrigerant circular tubes according to the first embodiment of the present invention will be described collectively in FIG. In the one-to-one combination of the circular tubes for refrigerant, the configuration described with reference to FIG. 14 is used. The tube conditions are φ9.52 × t0.8: φ5 × t0.6. The water flow becomes large.

  Also, (b) the combination of the water circular tube and the refrigerant circular tube, 1 to 2, is the form described in the first embodiment of the present invention, and the tube conditions are φ9.52 × t0.8: φ5. Xt0.6, as merits, good occupation efficiency at the time of accumulation, large water flow rate, and small refrigerant pressure loss.

  Further, in the combination 1 to 3 of (c) the water circular tube and the refrigerant circular tube, the refrigerant circular tube is positioned at every 120 ° around the water circular tube, and the tube condition is φ9.52. × t0.8: φ4 × t0.6, the water flow rate is large as a merit.

  Further, in the combination 2 to 2 of (d) the water circular tube and the refrigerant circular tube, a plurality of forms shown in FIGS. (A) and (b) are conceivable. In the form formed by joining the circular pipes for the refrigerant vertically to the concave part of the circular pipe for use, and in the illustration (b), the circular pipe for refrigerant is placed at a position of 45 ° to the right above the concave part of the circular pipe for water. There is a form formed by bonding, and the pipe condition is φ7 × t0.5: φ4 × t0.6, and the advantage is that the pipe bondability is good.

  Further, in the combination 2 to 4 of (e) the water circular tube to the refrigerant circular tube, a plurality of forms of (a) and (b) are conceivable. In the form in which the forms are arranged in parallel, and in the form (b) in the figure (b) in the figure (a), the form is formed by joining the upper part of the left pipe and the lower part of the right pipe respectively. The condition is φ7 × t0.5: φ3.6 × t0.6. As a merit, the heat exchange area is large in the number range that can be bent and the pipe jointability is good.

  Further, in the combination 3 to 3 of (f) the water circular pipe and the refrigerant circular pipe, as described in the one-to-one combination (b), the tube diameter center of the water circular pipe 2 is 45 °. The unit is constructed in such a way that three sets of units formed by joining the refrigerant circular tubes 3 at an angle are joined in parallel, and the tube conditions are φ7 × t0.5: φ3.6 × t0.6, as a merit Has a large heat exchange area within the range of the number that can be bent.

It is an expanded sectional view which shows the heat exchange pipe for hot water supply in Embodiment 1 of this invention. It is a top view which shows the heat exchanger for hot water supply in Embodiment 1 of this invention. It is a partial expanded sectional view which shows the heat exchanger for hot water supply in Embodiment 1 of this invention. It is sectional drawing which shows the heat exchanger for hot water supply in Embodiment 1 of this invention. It is a top view which shows the processing jig of the heat exchanger for hot water supply in Embodiment 1 of this invention. It is a side view which shows the processing jig of the heat exchanger for hot water supply in Embodiment 1 of this invention. It is a top view which shows the heat exchanger for spiral shaped hot water supply in Embodiment 1 of this invention. It is a side view which shows the heat exchanger for helical hot water supply in Embodiment 1 of this invention. It is a front view which shows the heat exchanger for helical hot water supply in Embodiment 1 of this invention. It is a top view which shows the helical bending jig tool apparatus of the heat exchanger for helical hot water supply in Embodiment 1 of this invention. It is a side view which shows the spiral bending jig tool apparatus of the heat exchanger for helical hot water supply in Embodiment 1 of this invention. It is a side view which shows the heat exchanger for helical hot water supply in Embodiment 1 of this invention. It is a side view which shows the heat exchanger for helical hot water supply in Embodiment 1 of this invention. It is a fragmentary sectional view which shows the other heat exchange pipe for hot water supply in Embodiment 1 of this invention. It is an expanded sectional view which shows the other heat exchanger for hot water supply in Embodiment 1 of this invention. It is a perspective view which shows schematic shape of the other heat exchanger for hot water supply in Embodiment 1 of this invention. It is a perspective view which shows schematic shape of the other heat exchanger for hot water supply in Embodiment 1 of this invention. It is a front view which shows schematic shape of the other heat exchanger for hot water supply in Embodiment 1 of this invention. It is a front view which shows schematic shape of the other heat exchanger for hot water supply in Embodiment 1 of this invention. It is a partial expanded side view which shows the other heat exchanger for hot water supply in Embodiment 1 of this invention. It is a fragmentary sectional view which shows the other heat exchanger for hot water supply in Embodiment 1 of this invention. It is explanatory drawing which shows the combination of the water circular tube and refrigerant | coolant circular tube in Embodiment 1 of this invention.

Explanation of symbols

  1 heat exchange pipe, 2 water circular pipe, 3 refrigerant circular pipe, 4 allowable space, 5 heat exchanger, 5a outermost circumference, 5b innermost circumference, 5e connecting pipe, 6 recess, 7 sheet-like heat insulating material, 8 bending R, 9 Bending jig body, 10 Spiral bending jig device.

Claims (6)

It consists of a plurality of metal pipes of different diameters that are in close contact over the entire length. Among them, the primary side fluid such as CO2 is flowed through several circular pipes, and the secondary side fluid is allowed to flow through the remaining circular pipes with both fluids. A heat exchanger for hot water heaters characterized by performing heat exchange between. 2. The water pipe according to claim 1, wherein a plurality of water pipes are joined in parallel, a recess is provided between the water pipes, and a refrigerant pipe is arranged in the recess between the water pipes. Heat exchanger for hot water supply. The heat exchanger for water heater according to claim 1 or 2, wherein a plurality of the heat exchangers are stacked in the permissible space, and the heat exchanger is bent into a multistage track winding shape within the permissible space. Exchanger. 4. The heat exchanger for hot water supply according to claim 3, wherein a heat exchanger is formed by bending into a track winding shape, and a sheet-like heat insulating material is provided between the heat exchangers. Selection based on conditions such as the temperature, pressure, flow rate of each fluid for the required heat exchange capacity required, and the overall length of the circular pipe for the mounting shape, and numerical values such as the outer diameter, inner diameter, number of pipes, etc., can be selected accurately The heat exchanger for a hot water heater according to claim 1, wherein The heat exchanger for a hot water heater according to claim 1 or 2, wherein the heat exchanger has a shape capable of mounting a circular pipe having a maximum length in an allowable space.

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