JP2009097818A - Heat exchanger - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat exchanger of high maintenance performance. <P>SOLUTION: A plate-shaped first passage member for first working fluid to flow inside and a second passage member for second working fluid to flow inside are detachable, so that the first passage member and the second passage member are easily separable. In the case of conducting maintenance to either one of the first passage member and the second passage member, the first passage member and the second passage member are separated for maintenance, instead of conducting large-scale maintenance. Maintenance performance of the heat exchanger is thus improved. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a heat exchanger that exchanges heat between a first working fluid and a second working fluid.

  A flow path member having a flow path for circulating tap water and a flow path member having a flow path for circulating high-temperature, high-pressure carbon dioxide are joined to each other in the flow paths of tap water and carbon dioxide. There is known a heat exchanger that is brought into thermal contact and moves heat between tap water and carbon dioxide (see, for example, Patent Document 1).

When tap water contains a large amount of calcium components, for example, scale may adhere to the inside of the channel member through which tap water is circulated. If scale adheres to the inside of the channel member, there is a problem that the performance of heat exchange deteriorates or the inside of the channel is clogged. In such a case, repair or replace the channel member of tap water. There is a need.
JP-A-5-196377

  However, in the above configuration, when the channel member for tap water and the channel member for carbon dioxide are integrated, heat exchange is performed even when only the channel member for tap water is repaired. It is necessary to remove the entire vessel. When removing the entire heat exchanger, the carbon dioxide in the flow path member will leak to the outside, so it is necessary to compress and fill the flow path member with carbon dioxide again in a well-equipped place such as a factory. . The same applies to the case where the flow path member is cleaned, not limited to repair / replacement, and there is a problem that such maintenance work becomes large. The same problem may arise when using other working fluids, not only when using tap water and carbon dioxide as working fluids.

  In view of the circumstances as described above, an object of the present invention is to provide a heat exchanger having high maintainability.

  In order to achieve the above object, a heat exchanger according to the present invention is a plate-like first flow path member that circulates a first working fluid therein, and is detachably wound around the first flow path member, And a second flow path member that circulates a second working fluid that exchanges heat with the first working fluid.

  According to the present invention, since the plate-like first flow path member that circulates the first working fluid and the second flow path member that circulates the second working fluid inside are detachable, the first flow The path member and the second flow path member can be easily separated. When maintenance is performed on only one of the first flow path member and the second flow path member, the maintenance can be performed by separating the first flow path member and the second flow path member. This eliminates the need for maintenance. Thereby, the maintainability of a heat exchanger can be improved. Further, according to the present invention, since the second flow path member is wound around the plate-shaped first flow path member, heat is applied not only on one surface of the plate-shaped first flow path member but also on the other surface. Since the exchange can be performed, the efficiency of the heat exchange can be increased.

The heat exchanger is characterized in that the first flow path member and the second flow path member are detachably bonded via an adhesive member.
According to the present invention, since the first flow path member and the second flow path member are detachably bonded via the adhesive member, the first flow path member and the second flow path are bonded by the adhesive member. It is possible to prevent the positional deviation between the members and the degree of thermal contact between the first flow path member and the second flow path member. In addition, since the first flow path member and the second flow path member can be easily separated since they are detachably bonded by the bonding member, high maintainability can be ensured.

In the above heat exchanger, the first flow path member has a groove in a portion wound by the second flow path member.
According to the present invention, since the first flow path member has the groove portion wound by the second flow path member, the second flow path member is wound along the groove portion of the first flow path member. Will be. Thereby, the position difference between the first flow path member and the second flow path member can be prevented by the groove, and the degree of thermal contact between the first flow path member and the second flow path member can be reduced. Can be increased.

Said heat exchanger is characterized by the corner | angular part of the part wound around the said 2nd flow path member among the said 1st flow path members having the rounded shape.
According to the present invention, the corner portion of the portion of the first flow path member that is wound around the second flow path member has a rounded shape. Adhesiveness with the second flow path member can be further improved. Thereby, the degree of thermal contact between the first flow path member and the second flow path member can be further increased.

In the heat exchanger, the first flow path member and the second flow path member may be configured such that the first working fluid flows in one direction and the second working fluid flows in a direction opposite to the one direction. It is characterized by being arranged in.
According to the present invention, the first flow path member and the second flow path member are arranged so that the first working fluid flows in one direction and the second working fluid flows in a direction opposite to the one direction. The heat exchange can be efficiently performed between the first working fluid and the second working fluid.

In the above heat exchanger, the first flow path member has a high temperature portion through which the first working fluid having a predetermined temperature or higher flows and a low temperature portion through which the first working fluid lower than the predetermined temperature flows. The second channel member is spirally wound around the first channel member, and the number of windings per unit length in the spiral direction of the second channel member is higher than that of the low temperature part. It is characterized by fewer parts.
According to the present invention, in the first flow path member, the high temperature portion in which the first working fluid having a temperature equal to or higher than the predetermined temperature flows is lower than the low temperature portion in which the first working fluid having a temperature lower than the predetermined temperature flows. Since the number of turns per unit length in the spiral direction of the second flow path member wound spirally around one flow path member is reduced, heat exchange is performed more slowly in the high temperature portion than in the low temperature portion. It will be. Since adhesion of the scale in the high temperature part is suppressed, the number of maintenance can be suppressed. The predetermined temperature is preferably a temperature at which the scale starts to adhere, for example, about 65 ° C to 70 ° C.

In the above heat exchanger, the first flow path member includes a high temperature portion through which the first working fluid having a temperature equal to or higher than a predetermined temperature flows, and a low temperature portion through which the first working fluid having a temperature lower than the predetermined temperature flows. The high-temperature part has a larger cross-sectional area of the first working fluid than the low-temperature part.
According to the present invention, the high temperature portion in which the first working fluid having a temperature equal to or higher than the predetermined temperature in the first flow path member is first compared to the low temperature portion in which the first working fluid having a temperature lower than the predetermined temperature flows. Since the cross-sectional area of the working fluid is large, it is possible to prevent clogging of the flow path due to the adhesion of the scale in the high temperature part. The predetermined temperature is preferably a temperature at which the scale starts to adhere, for example, about 65 ° C to 70 ° C.

In the above heat exchanger, the first flow path member includes a high temperature portion through which the first working fluid having a temperature equal to or higher than a predetermined temperature flows, and a low temperature portion through which the first working fluid having a temperature lower than the predetermined temperature flows. The high temperature part and the low temperature part are provided in a separable manner.
According to the present invention, a high temperature portion in which a first working fluid having a temperature equal to or higher than a predetermined temperature in the first flow path member can be separated from a low temperature portion in which a first working fluid having a temperature lower than the predetermined temperature flows. Since it is provided, at the time of maintenance, it is possible to carry out repair / replacement or the like by separating only the high temperature part where the scale is likely to adhere. Thereby, maintainability can be improved further. The predetermined temperature is preferably a temperature at which the scale starts to adhere, for example, about 65 ° C to 70 ° C.

  ADVANTAGE OF THE INVENTION According to this invention, a heat exchanger with high maintainability can be provided.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic diagram illustrating an overall configuration of a hot water supply system 1.
A hot water supply system 1 according to the present invention includes a water heating unit 2, a refrigerant circulation unit 3, and a heat exchanger 4.

The water heating unit 2 includes a water supply source 21, a pipe 22, a circulation pump 23, a pipe 24, a pipe 25, and a hot water supply part 26. In the water heating unit 2, water (H ₂ O) as the first working fluid is supplied from the water supply source 21 to the heat exchanger 4 through the pipe 22, the circulation pump 23, and the pipe 24 in this order. 4 is heated to be hot water, and the hot water is supplied from the hot water supply section 26 through the pipe 25 from the heat exchanger 4.

  The water supply source 21 is a water supply source that circulates through the water heating unit 2, and examples thereof include a water pipe and a water storage tank. The pipe 22 is a pipe that connects the water supply source 21 and the circulation pump 23. The circulation pump 23 is a pump that sucks water from the water supply source 21 and supplies it to the pipe 24 side. The pipe 24 is a pipe that connects the circulation pump 23 and the heat exchanger 4. The pipe 25 is a pipe that connects the heat exchanger 4 and the hot water supply unit 26.

The refrigerant circulation unit 3 includes a refrigerant heat exchanger 31, a pipe 32, a compressor 33, a pipe 34, a pipe 35, an expansion valve 36, and a pipe 37. Is filled with carbon dioxide (CO ₂ ) as a refrigerant (second working fluid). The refrigerant circulation unit 3 is a closed space, and the refrigerant flows through the refrigerant heat exchanger 31, the pipe 32, the compressor 33, and the pipe 34 in order, and is supplied to the heat exchanger 4. 35, the expansion valve 36, and the pipe 37 are supplied to the refrigerant heat exchanger 31 again. As described above, the refrigerant circulation unit 3 is configured such that the refrigerant circulates through the respective parts.

  The refrigerant heat exchanger 31 has a fan 38 that takes in the atmosphere, and is a device that absorbs the heat of the taken-in air into the refrigerant and supplies the refrigerant to the pipe 32. The pipe 32 is a pipe that connects the refrigerant heat exchanger 31 and the compressor 31. The compressor 33 is a device that compresses the refrigerant and supplies the refrigerant to the pipe 34 side. The compressor 33 can increase the temperature of the refrigerant by compressing the refrigerant. By arranging the compressor 33 on the downstream side of the refrigerant heat exchanger 31, the temperature of the refrigerant flowing into the compressor 33 can be raised to some extent, and the compressor 33 generates a correspondingly high temperature. Energy can be reduced. The pipe 34 is a pipe that connects the compressor 33 and the heat exchanger 4. The pipe 35 is a pipe that connects the heat exchanger 4 and the expansion valve 36. The expansion valve 36 is a device that expands the refrigerant and supplies the refrigerant to the pipe 37 side, and the temperature of the refrigerant can be lowered by expanding the refrigerant.

  The heat exchanger 4 is a device that exchanges heat between the water that flows through the water heating unit 2 and the refrigerant that circulates through the refrigerant circulation unit 3, and is provided on the flow path of the water heating unit 2 and the refrigerant circulation unit 3. It has been. FIG. 2 is a view showing the appearance of the heat exchanger 4. FIG. 3 is a diagram illustrating a configuration when the heat exchanger 4 is viewed from above. As shown in FIGS. 2 and 3, the heat exchanger 4 includes a flow passage member 41 for water circulation and a flow passage member 42 for refrigerant circulation.

  The water flow channel member 41 is a plate-like member having a water flow inlet 43, a water flow portion 44, and a water flow outlet 45. The water inlet 43 is connected to the pipe 24 of the water heating unit 2. FIG. 4 is a cross-sectional view showing the internal configuration of the water circulation part 44. As shown in FIG. 4, the water circulation part 44 has a plurality of flow path walls 44a provided therein, and a flow path 44b is formed inside the water flow part 44 by the flow path walls 44a. As shown in FIGS. 2 and 4, the water outlet 45 is connected to the pipe 25 of the water heating unit 2. In the channel member 41, water flows in from the water inlet 43, flows through the channel 44 b in the water circulation part 44, and flows out from the water outlet 45. In the entire flow path member 41, the direction in which water flows is, for example, from the lower side to the upper side in FIG. 2 (from the water inlet 43 side to the water outlet 45 side).

  As shown in FIG. 2, the flow passage member 42 for refrigerant circulation is a tubular member having a refrigerant inlet 46, a refrigerant circulation portion 47, and a refrigerant outlet 48. The refrigerant inlet 46 is connected to the pipe 34 of the refrigerant circulation unit 3. The refrigerant circulation portion 47 is wound around the flow path member 41 in a spiral shape from the water inlet 43 to the water outlet 45.

  As shown in FIG. 3, an adhesive member 49 is provided between the refrigerant circulation portion 47 and the flow path member 41. The adhesive member 49 is made of, for example, a brazing material such as silver brazing or a resin material such as epoxy. The adhesive member 49 is in a state where the inside of the flow path member 42 and the inside of the flow path member 41 are in thermal contact, and the flow path member 42 and the flow path member 41 are detachably bonded. It is in the state.

  As shown in FIG. 2, the refrigerant outlet 48 is connected to a pipe 35 of the refrigerant circulation unit 3. In the circulation member 42, the refrigerant flows from the refrigerant inlet 46, flows through the refrigerant circulation portion 47, and flows out from the refrigerant outlet 48. In the entire flow path member 42, the direction in which the refrigerant flows is, for example, the direction from the upper side to the lower side in FIG. 2 (from the refrigerant inlet 46 side to the refrigerant outlet 48 side). It is in the direction.

Next, operation | movement of the hot water supply system 1 comprised as mentioned above is demonstrated.
In the water heating unit 2, the circulation pump 23 is operated to circulate water from the water supply source 21 to the pipe 22. This water flows from the pipe 22 into the heat exchanger 4 through the pipe 24 and the water inlet 43 by the circulation pump 23. The temperature of water when flowing into the heat exchanger 4 is about 15 ° C.

  On the other hand, in the refrigerant circulation unit 3, the refrigerant is circulated by the compressor 33 and the expansion valve 36. The refrigerant heat exchanger 31 absorbs the heat of the outside air taken in by the fan 38 and raises the temperature of the refrigerant. This refrigerant flows through the pipe 32 in a state where the pressure is 30 atm and the temperature is about 10 ° C., and flows into the compressor 33. The refrigerant that has flowed into the compressor 33 is compressed by the compressor 33, pressurized to about 100 atm, and supplied to the pipe 34 with the temperature raised to about 130 ° C. by this compression. This refrigerant flows into the heat exchanger 4 from the pipe 34 through the refrigerant inlet 46.

  In the heat exchanger 4, the water that has flowed into the flow path member 41 through the water inlet 43 flows through the flow path 44 b of the water flow portion 44. In addition, the refrigerant that has flowed into the flow path member 42 through the refrigerant inlet 46 flows through the refrigerant circulation portion 47. Since the interior of the flow path member 41 and the interior of the flow path member 42 are in thermal contact with each other, heat is transferred between the water in the flow path member 41 and the refrigerant in the flow path member 42. An exchange will be made. Specifically, heat is transferred from the refrigerant in the flow path member 42 to the water in the flow path member 41, and the pressure and temperature of the refrigerant are reduced and the temperature of the water is increased. Since the flow direction of water in the entire flow path member 41 and the flow direction of the refrigerant in the entire flow path member 42 are opposite to each other, heat exchange is efficiently performed between the water and the refrigerant.

  The water whose temperature has risen becomes hot water of about 90 ° C., flows out into the pipe 25, and is supplied from the hot water supply unit 26. As described above, in the water heating unit 2, the operation of supplying the water from the water supply source 21 to the heat exchanger 4 by the circulation pump 23 and supplying the hot water generated in the heat exchanger 4 from the hot water supply unit 26 is repeated. become.

  When the water heating unit 2 repeats the above operation, if water containing a large amount of calcium components is supplied from the water supply source 21, for example, the scale adheres to the channel wall 44a, the channel 44b, or the like of the water circulation unit 44. There is. If such a scale adheres to the inside of the water circulation part 44, there is a problem that the performance of heat exchange is reduced or the inside of the flow path 44b is clogged, so the flow path member 41 needs to be replaced periodically. There is. In this embodiment, since the flow path member 41 and the flow path member 42 are detachably bonded by the adhesive member 49, the flow path member 41 and the flow path member 42 are separated from each other when the flow path member 41 is replaced. Only the road member 41 may be replaced. In this case, since it is not necessary to separate the flow path member 42 from the refrigerant circulation unit 3, there is no need to re-enclose the refrigerant enclosed in the refrigerant circulation unit 3.

  On the other hand, the refrigerant whose pressure and temperature have decreased flows out into the pipe 35 in a state where the pressure is 100 atm and the temperature is about 20 ° C. The refrigerant flows into the expansion valve 36 through the pipe 35 and is expanded by the expansion valve 36 to reduce the pressure to about 30 atmospheres. In addition, the temperature decreases to about 5 ° C. due to the expansion. The refrigerant whose pressure has been reduced due to the reduced pressure is supplied again to the refrigerant heat exchanger 31 via the pipe 37. In the refrigerant heat exchanger 31, the heat of the outside air taken in by the fan 38 as described above is absorbed, and the temperature of the refrigerant rises to about 10 ° C. As described above, in the refrigerant circulation unit 3, the refrigerant is compressed by the compressor 33 to raise the temperature and flow into the heat exchanger 4, and the refrigerant cooled in the heat exchanger 4 is expanded by the expansion valve 36 to reduce the pressure. Then, the operation of absorbing the heat of the outside air in the refrigerant heat exchanger 31 is repeated.

  Thus, according to the present embodiment, the plate-like flow path member 41 that circulates water as the first working fluid therein and the flow path member 42 that circulates the refrigerant as the second working fluid therein. Since it is detachable, the flow path member 41 and the flow path member 42 can be easily separated. When only one of the flow path member 41 and the flow path member 42 is to be maintained, the maintenance can be performed by separating the flow path member 41 and the flow path member 42, so that large-scale maintenance is performed. You don't have to. Thereby, the maintainability of the heat exchanger 4 can be improved.

  Further, according to the present embodiment, since the tubular flow path member 42 is wound around the plate-shaped flow path member 41, heat is applied not only on one surface of the plate-shaped flow path member 41 but also on other surfaces. Since the exchange can be performed, the efficiency of the heat exchange can be increased.

The technical scope of the present invention is not limited to the above-described embodiment, and appropriate modifications can be made without departing from the spirit of the present invention.
For example, as shown in FIG. 5, the groove portion 50 may be provided in a portion of the surface of the flow path member 41 that is wound by the flow path member 42. Since the flow path member 42 is wound along the groove portion 50 of the flow path member 41, the groove portion 50 can prevent the positional deviation between the flow path member 41 and the flow path member 42, and the flow path The degree of thermal contact between the member 41 and the flow path member 42 can be increased.

  In this case, when the flow path member 42 is wound along the groove 50, the state shown in FIG. FIG. 6 is a view showing a configuration along the AA section in a state where the flow path member 42 is wound around FIG. For the adhesion between the flow path member 41 and the flow path member 42, the adhesive member 49 need not be disposed so as to fill the space between the flow path member 41 and the flow path member 42. For example, as shown in FIG. It is also possible to arrange the adhesive member 49 along the edges of the. Even in such a configuration, the flow channel member 41 and the flow channel member 42 can be detachably bonded, and the flow channel member 41 and the flow channel member 42 can be in thermal contact with each other. it can.

  Moreover, as shown in FIG. 7, the corner | angular part 41a of the part wound by the flow path member 42 among the flow path members 41 may be a rounded shape. Thereby, since the flow path member 41 and the flow path member 42 are in close contact with each other at the corner 41a of the flow path member 41, the adhesion between the both can be further improved. The degree of thermal contact with the flow path member 42 can be further increased.

  Further, as shown in FIG. 8, a portion of the flow path member 41 at which the scale starts to adhere, that is, a portion where water having a temperature lower than a predetermined temperature set in the range of 65 ° C. to 70 ° C. flows is the low temperature portion 41c. In addition, the portion through which water having a temperature equal to or higher than a predetermined temperature flows is defined as the high temperature portion 41b, and the number of turns per unit length in the spiral direction of the flow path member 42 is reduced in the high temperature portion 41b than in the low temperature portion 41c. Alternatively, the flow path member 42 may be wound so that the density of the flow path member 42 is coarser in the high temperature section 41b than in the low temperature section 41c. According to this configuration, heat exchange is performed more gently in the high temperature portion 41b than in the low temperature portion 41c. Since the adhesion of the scale at the high temperature part 41b is suppressed, the number of maintenance can be suppressed.

  Further, as shown in FIG. 9, water having a temperature lower than a predetermined temperature set in the range of 65 ° C. to 70 ° C. flows in the flow path member 41 as in the configuration of FIG. The portion to be used is the low temperature portion 41c and the portion through which water having a temperature equal to or higher than the predetermined temperature flows is the high temperature portion 41b, and the flow passage cross-sectional area of the flow channel 44b is larger in the high temperature portion 41b than the low temperature portion 41c. It does not matter. According to this configuration, it is possible to prevent clogging of the flow path due to scale adhesion in the high temperature portion 41b.

  Further, as shown in FIG. 10, water having a temperature lower than a predetermined temperature set in the range of 65 ° C. to 70 ° C. flows in the flow path member 41 as in the configuration of FIG. The part to be used may be the low temperature part 41c, the part through which water having a temperature equal to or higher than the predetermined temperature flows may be the high temperature part 41b, and the high temperature part 41b and the low temperature part 41c may be provided to be separable. According to this configuration, it is possible to perform repair / replacement or the like by separating only the high temperature portion 41b to which the scale easily adheres during maintenance. Thereby, maintainability can be improved further.

The figure which shows the external appearance of the hot water supply system which concerns on embodiment of this invention. The figure which shows the external appearance of the heat exchanger which concerns on this embodiment. The figure which shows the structure seen from the upper surface of the heat exchanger. Sectional drawing which shows the structure inside a heat exchanger. The figure which shows the other structure of a heat exchanger. The figure which shows the other structure of a heat exchanger. The figure which shows the other structure of a heat exchanger. The figure which shows the other structure of a heat exchanger. The figure which shows the other structure of a heat exchanger. The figure which shows the other structure of a heat exchanger.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Hot water supply system 4 ... Heat exchanger 41 ... Channel member 41a ... Corner | angular part 41b ... High temperature part 41c ... Low temperature part 42 ... Channel member 44b ... Channel 49 ... Adhesive member 50 ... Groove part

Claims (8)

A plate-like first flow path member for circulating the first working fluid therein;
A second flow path member that is detachably wound around the first flow path member and allows a second working fluid to circulate therein to exchange heat with the first working fluid. Heat exchanger. The heat exchanger according to claim 1, wherein the first flow path member and the second flow path member are detachably bonded via an adhesive member. The heat exchanger according to claim 1 or 2, wherein the first flow path member has a groove in a portion wound by the second flow path member. The corner part of the part wound by the said 2nd flow path member among said 1st flow path members is a rounded shape. Any one of Claims 1-3 characterized by the above-mentioned. The heat exchanger according to item. The first flow path member and the second flow path member are arranged such that the first working fluid flows in one direction and the second working fluid flows in a direction opposite to the one direction. The heat exchanger according to any one of claims 1 to 4, wherein the heat exchanger is characterized. The first flow path member has a high temperature portion through which the first working fluid having a temperature equal to or higher than a predetermined temperature flows and a low temperature portion through which the first working fluid having a temperature lower than the predetermined temperature flows.
The second flow path member is spirally wound around the first flow path member,
The number of turns per unit length in the spiral direction of the second flow path member is smaller in the high temperature portion than in the low temperature portion. The heat exchanger according to one item. The first flow path member has a high temperature portion through which the first working fluid having a temperature equal to or higher than a predetermined temperature flows and a low temperature portion through which the first working fluid having a temperature lower than the predetermined temperature flows.
The heat exchanger according to any one of claims 1 to 6, wherein the high-temperature portion has a larger cross-sectional area of the first working fluid than the low-temperature portion. . The first flow path member has a high temperature portion through which the first working fluid having a temperature equal to or higher than a predetermined temperature flows and a low temperature portion through which the first working fluid having a temperature lower than the predetermined temperature flows.
The heat exchanger according to any one of claims 1 to 7, wherein the high-temperature part and the low-temperature part are provided so as to be separable.

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