JP4200323B2 - Heat exchange device and heat pump water heater using the same - Google Patents

Description

The present invention relates to a heat exchange device that exchanges heat between a first fluid and a second fluid (for example, a water / refrigerant heat exchanger of a heat pump type hot water heater and a heat pump hot water supply device using the same).

As an example of a heat exchange device for exchanging heat between a conventional first fluid and a second fluid, as shown in FIG. 5, a plurality of inner tubes 2 spirally twisted are mounted in an outer tube 1. A plurality of flow paths are formed in the outer tube 1 and a spiral twisted tape 3 is inserted into a flow path formed by a gap between the outer tube and the inner tube. A heat exchange device is known in which heat flowing between the water flowing through the flow path of the outer tube 1 and the refrigerant flowing through the inner tube 2 is exchanged (see, for example, Patent Document 1).
JP 2003-34395 A (page 1-3, FIGS. 1 to 4)

  However, in the above conventional heat exchange device, the insertion of the torsion tape 3 can achieve the effect of promoting heat transfer by making the water flowing through the flow path of the outer tube 1 turbulent, but the torsion tape 3 is a separate part. However, there is a problem that the operation and measures such as insertion of itself and positioning means in the outer tube 1 are necessary, and the manufacturing cost is increased. In addition, the torsion tape 3 increases the flow resistance of the water flowing through the flow path of the outer tube 1, increasing the pressure loss, and makes it difficult to limit the installation, the water pressure, and the driving force.

  SUMMARY OF THE INVENTION The present invention solves the above-described conventional problems, and an object thereof is to provide a high-performance heat exchange device that is low in manufacturing cost and suppresses pressure loss.

In order to solve the above-mentioned object, a heat exchanging device of the present invention comprises an outer tube, an inner tube located in the outer tube, and a grooved duplex formed by closely contacting the outer tube and the inner tube. A tube, a torsion tube that is twisted so as to be intertwined spirally using a plurality of the grooved double tubes, and a heat transfer tube that encloses the torsion tube, A spiral groove is provided on the inner wall surface, and the spiral direction of the spiral groove of the heat transfer tube is the same as the spiral direction of the torsion tube, and the spiral pitch of the spiral groove of the heat transfer tube is the same as that of the torsion tube. It is substantially the same as the spiral pitch, and is characterized in that a spiral swirl passage is formed between the inner wall of the heat transfer tube and the outer wall of the torsion tube .

  With this configuration, it is possible to provide a high-performance heat exchange device that can promote heat transfer without using separate parts, is low in manufacturing cost, and suppresses pressure loss.

  Moreover, the heat pump cycle apparatus which has a compressor and a heat radiator is provided, and let the said heat radiator be the heat pump hot-water supply apparatus using the heat exchange apparatus of this invention.

  As a result, the first fluid is heated using the heat radiation of the refrigerant flowing through the inner tube, whereby the refrigerant and the first fluid, for example, water are both turbulently flowed by the torsion tube, and highly efficient heat transfer can be realized. Even if either the outer tube or the outer tube is damaged, the refrigerant flowing through the inner tube and the water flowing through the heat transfer tube do not mix, and the lubricating oil of the compressor may enter the user's mouth. It is possible to provide a highly reliable heat pump hot water supply apparatus that can prevent entry into the system, realize early failure diagnosis and quick repair.

  ADVANTAGE OF THE INVENTION According to this invention, heat transfer promotion can be aimed at without using another components etc., a manufacturing cost is low, and the high performance heat exchange apparatus which suppressed the pressure loss can be provided.

The first invention includes an outer tube, an inner tube positioned within the outer tube, a grooved double tube configured by closely contacting the outer tube and the inner tube, and the grooved double tube. A twisted tube constructed by twisting so that they are spirally entangled with each other and a heat transfer tube that encloses the torsion tube, and provided with a spiral groove on the inner wall surface of the heat transfer tube, The spiral direction of the spiral groove of the heat transfer tube is the same as the spiral direction of the torsion tube, and the spiral pitch of the spiral groove of the heat transfer tube is substantially the same as the spiral pitch of the torsion tube. A spiral swirl passage is formed between the inner wall of the heat pipe and the outer wall of the torsion pipe .

  According to the present embodiment, by providing the spiral groove on the inner wall surface of the heat transfer tube, the spiral tube formed by the outer periphery of the torsion tube and the inner wall surface of the heat transfer tube is included in the heat transfer tube that includes the torsion tube. In the swirling flow path, the flow path portion close to the inner wall surface of the heat transfer tube is also a spiral flow path, so that a shortcut flow path in the flow path portion close to the inner wall surface of the heat transfer tube is prevented and the inner wall surface of the heat transfer tube is It is possible to provide a high-performance heat exchange device by restricting the fluid flowing in the near flow path portion to flow in a spiral manner and promoting turbulent heat transfer.

As described above, it is possible to provide a high-performance heat exchanging device that can promote heat transfer without using a separate part, is low in manufacturing cost, and suppresses pressure loss .

Further, according to this embodiment, by a spiral in the same direction of the helical grooves in the spiral direction of the torsion pipe, the torsion pipe periphery and the spiral direction of the formed swirling flow path by the inner wall surface of the heat transfer tube of The spiral direction of the fluid flowing spirally by the swirl flow path is the same as the spiral direction of the fluid flowing through the flow path portion close to the inner wall surface of the heat transfer tube by the spiral groove. It will be the same. Therefore, the flow of fluid is smooth in the entire flow path in the heat transfer tube, and a high-performance heat exchange device can be provided with a small flow path resistance .

Further , according to the present embodiment, the spiral pitch of the spiral groove is substantially the same as the spiral pitch of the torsion tube, so that the fluid spirals the swirl flow path in the heat transfer tube along the spiral pitch of the torsion tube. In contrast, the spiral groove causes the fluid flowing in the flow path portion near the inner wall surface of the heat transfer tube to flow along the spiral pitch of the spiral groove and synchronizes with the flow of the swirl flow path. In the entire flow path in the pipe, the flow of fluid becomes smooth, and a high-performance heat exchange device can be provided with a small flow path resistance.

In particular, the second invention is such that, in the heat exchange device of the first invention, the lead angle formed by the spiral groove provided on the inner wall of the heat transfer tube with the axial direction of the tube is 20 degrees or less.

  According to the present embodiment, the lead angle formed by the spiral groove with the axial direction of the heat transfer tube is set to be 20 degrees or less, so that the lead angle is small, so that the flow path portion close to the inner wall surface of the heat transfer tube When the fluid that flows through the spiral groove flows along the spiral pitch of the spiral groove, the flow resistance can be kept small.

In a third aspect of the invention, in particular, in the heat exchanging device of the first or second aspect , the first fluid flowing through the heat transfer tube and the second fluid flowing through the inner tube are made to counter flow.

  According to the present embodiment, the first fluid flowing through the heat transfer tube and the second fluid flowing through the inner tube are made to face each other, so that the heat transfer between the first fluid and the second fluid is made uniform and non-heated by the heating fluid. Since the temperature level of the heating fluid can be increased, a heat exchange device with good heat exchange efficiency can be provided.

4th invention is equipped with the heat pump cycle apparatus which has a compressor and a heat radiator especially, and the said heat radiator is a heat pump hot-water supply apparatus using the heat exchange apparatus as described in any one of 1st-3rd invention .

  According to the present embodiment, the first fluid is heated using the heat radiation of the refrigerant flowing through the inner pipe, whereby the refrigerant and the first fluid, for example, water are both turbulently caused by the torsion pipe, and highly efficient heat transfer is achieved. This can be realized, and even if either the inner pipe or the outer pipe is damaged, the refrigerant flowing through the inner pipe and the water flowing through the heat transfer pipe do not mix, and the lubricating oil of the compressor enters the user's mouth. It is possible to prevent the possibility of entering hot water, realize early failure diagnosis and quick repair, and provide a highly reliable heat pump water heater.

In particular, the fifth invention is that, in the fourth heat pump water heater, the refrigerant is carbon dioxide and the pressure is equal to or higher than the critical pressure.

  According to the present embodiment, by setting the pressure above the critical pressure, the carbon dioxide of the refrigerant is deprived of heat by the water and does not condense even if the temperature is lowered, and the temperature difference between the refrigerant and water throughout the heat exchange device. The water can be efficiently heated to the required high temperature level. Thus, a highly efficient heat pump hot-water supply apparatus can be provided by using a highly efficient heat exchange apparatus as a heat radiator of a heat pump cycle.

(Embodiment 1)
FIG. 1 is a component diagram showing a heat transfer tube and a torsion tube constituting the heat exchange device according to the first embodiment of the present invention, in which (a) is a side sectional view of the heat transfer tube, and (b) is the heat transfer tube. It is a torsion tube configuration diagram included. 2 is a side view of the main part of the heat exchange device, FIG. 3 is a cross-sectional view showing the AA, BB, and CC sections of the heat exchange device shown in FIG. 2, and FIG. 4 is the heat exchange device. It is a heat pump cycle system block diagram using the.

  3, (a) is a cross-sectional view taken along the line AA shown in FIG. 2, (b) is a cross-sectional view taken along the line BB shown in FIG. 2, and (C) is a cross-sectional view taken along the line CC shown in FIG. A cross-sectional view of the surface is shown.

  1 to 3, reference numeral 10 denotes a heat transfer tube through which a first fluid such as water flows, and reference numerals 11 and 12 denote grooved double tubes of a refrigerant tube through which a second fluid such as carbon dioxide refrigerant flows. 13 is a torsion pipe formed by spirally twisting the two grooved double pipes 11 and 12 so that they are intertwined with each other, 11a and 12a are outer pipes having a plurality of grooves 14 on the inner wall, 11b , 12b are inner pipes arranged in the inner pipes 11a and 12a, and in close contact with the outer pipes 11a and 12a. Thus, the grooved double tube 11 is constituted by the outer tube 11a and the inner tube 11b, respectively, and the grooved double tube 12 is constituted by the outer tube 12a and the inner tube 12b. P1 indicates the helical pitch of the torsion tube 13.

  Then, by inserting this torsion tube 13 into the heat transfer tube 10 to constitute a heat exchange device, a swirl passage 15 through which water of the first fluid flows is formed between the outer wall of the torsion tube 13 and the inner wall of the heat transfer tube. Is done. Reference numeral 16 denotes a plurality of spiral grooves provided on the inner wall surface of the heat transfer tube 10. α is a lead angle formed by the spiral groove with the axial direction of the heat transfer tube 10, and the lead angle is designed to be 20 degrees or less. P2 indicates the helical pitch of the helical groove, and the helical pitch of the helical groove of the heat transfer tube is substantially the same as the helical pitch of the torsion tube 13.

In FIG. 3, 16a is one of the plurality of spiral grooves 16, and is used to explain the spiral direction. As shown in FIG. 3, the grooved double tube 11 is located above and the grooved double tube 12 is located below on the AA cut surface, and the grooved double tube 11 is located below on the BB cut surface. The grooved double tube 12 is located above, and the grooved double tube 11 is located above and the grooved double tube 12 is located below the CC cut surface. Thus, when viewed from the direction of the AA cut surface, the torsion tube 13 is spiral in the counterclockwise direction as shown in the spiral direction L. Thereby,
The swirling flow path 15 is also spiraled counterclockwise.

  16a is positioned above the AA cut surface, below the BB cut surface, and above the CC cut surface. As described above, the plurality of spiral grooves 16 including the groove 16a from the AA cut surface to the BB cut surface and the CC cut surface are similarly counterclockwise as shown in the spiral direction L. It is spiraling in the direction.

  Thus, the spiral direction L of the spiral groove 16 is the same as the spiral direction of the torsion tube 13 and the spiral direction of the swirl flow path 15.

  In each figure, the number, shape, distribution, and the like of the spiral grooves 16 are for explaining the embodiments and are not necessarily the same.

In FIG. 4, the compressor 17, the heat radiator 18, the pressure reduction means 19, and the heat absorber 20 are connected to the closed circuit by the refrigerant circuit. The refrigerant circuit uses, for example, carbon dioxide (CO ₂ ) as a refrigerant, and uses a supercritical heat pump cycle in which the refrigerant pressure on the high pressure side is equal to or higher than the critical pressure of the refrigerant. The compressor 17 is driven by a built-in electric motor (not shown), and compresses and sucks the sucked refrigerant to a critical pressure. The decompression means 19 is a throttle valve that is driven by a stepping motor (not shown), and controls the refrigerant flow path resistance.

  The radiator 18 includes a refrigerant channel and a water channel that performs heat exchange with the refrigerant channel. The radiator 18 uses the heat exchange device described above, the refrigerant flow path is the inner pipe 11b of the grooved double pipe 11 and the inner pipe 12b of the grooved double pipe 12, and the water flow path is the inner wall of the heat transfer pipe 10. It is set as the flow path between the outer walls of the grooved double tubes 11 and 12. This water flow path is a swirl flow path 15 constituted by the outer periphery of the torsion tube 13 and the inner periphery of the heat transfer tube 10. As described above, the inlets of the inner pipes 11b and 12b of the heat exchange device are connected to the refrigerant circulation circuit portion from the compressor 17, and the outlets are connected to the refrigerant circulation circuit portion to the decompressor 19. . And the flow direction of the refrigerant flow path of this heat exchanger tube is opposite to the flow direction of the water flow path.

  A water supply pipe 21 for supplying water or pre-warm water to the water flow path and a hot water supply circuit 23 for passing hot water discharged from the water flow path to the hot water storage tank 22 are connected. The water supply pipe 21 is connected to a water inlet (not shown) of the heat exchange device described above, and a hot water outlet (not shown) of the heat exchange device is communicated with the hot water supply circuit 23. A laminated pump 24 transports water or pre-warm water provided in the water supply pipe 21. In this way, water or pre-warm water is transported from the hot water storage tank 22 by the stacking pump 24, heated to a predetermined temperature in the water flow path, and then transported to the hot water storage tank 22 for storage. A hot water discharge pipe 25 communicates with the hot water storage tank 22.

  About the heat exchange apparatus comprised as mentioned above and the heat pump hot-water supply apparatus using the same heat exchange apparatus, the effect | action and operation | movement are demonstrated below.

  When water or preheated water is supplied from the hot water storage tank 22 through the water supply pipe 21, the compressor 17 is started, the refrigerant is compressed to a critical state of high temperature and pressure, and the heat pump cycle is activated.

  The high-temperature and high-pressure refrigerant gas discharged from the compressor 17 flows into the radiator 18 and heats water flowing through the water flow path including the swirl flow path 15. Then, the heated water flows through the hot water supply circuit 23 and flows into the hot water storage tank 22 and is stored, so-called stacked boiling. On the other hand, the refrigerant cooled by the radiator 18 is decompressed by the decompression means 19 and flows into the heat absorber 20, where it absorbs natural energy such as atmospheric heat, solar heat, and underground heat to evaporate and is converted into the compressor 17. Return.

When there is a demand for hot water supply, hot water stored in the hot water storage tank 22 is supplied to the hot water supply faucet (not shown) used by the user through the hot water supply pipe 25. Depending on the temperature level of hot water supply demand, it can be mixed with tap water or the like and supplied at a predetermined temperature.

  In the radiator 18, the refrigerant flowing through the refrigerant channels 11 b and 12 b of the radiator 18 is pressurized to a critical pressure or higher by the compressor 17, so heat is taken away by the water flowing through the water channel of the radiator 18. It does not condense even when the temperature drops. Therefore, it becomes easy to form a temperature difference between the refrigerant and water in the entire radiator 18, high-temperature hot water can be obtained, and the heat exchange efficiency can be increased, thereby providing a highly efficient heat pump cycle type hot water supply device. .

  As shown in FIGS. 1 to 3, a torsion tube 13 constituted by two grooved double tubes 11 and 12 twisted so as to be intertwined with each other in a spiral manner is disposed in the heat transfer tube 10. As a result, a spiral water swirl flow path 15 is formed between the inner wall of the heat transfer tube 10 and the outer wall of the torsion tube 13, and the refrigerant is also swirled spirally. Therefore, it is possible to obtain a heat exchange device that can efficiently exchange heat and has good heat exchange performance, and a highly efficient heat pump cycle hot water supply device.

  In particular, by providing the spiral groove 16 on the inner wall surface of the heat transfer tube 10, the spiral shape constituted by the outer periphery of the torsion tube 13 and the inner wall surface of the heat transfer tube 10 in the heat transfer tube 10 including the torsion tube 13. In the swirling flow path 15, the flow path portion near the inner wall surface of the heat transfer tube 10 also becomes a spiral flow channel due to the influence of the spiral groove 16. In addition to preventing the flow path, it is possible to restrict the fluid flowing in the flow path portion close to the inner wall surface of the heat transfer tube 10 to flow spirally, thereby promoting turbulent heat transfer and improving the performance of the heat exchange device. .

  As described above, it is possible to provide a high-performance heat exchanging device that can promote heat transfer without using separate parts, is low in manufacturing cost, and suppresses water-side flow pressure loss.

  Further, by setting the spiral direction of the spiral groove 16 to the same direction as the spiral direction of the torsion tube 13 and the counterclockwise direction (illustrated) and the spiral direction L, the outer periphery of the torsion tube 13 and the inner wall surface of the heat transfer tube 10 are obtained. The spiral direction of the swirl flow path 15 configured by the same is the same direction as the spiral direction of the spiral groove 16, so that the spiral direction of the fluid flowing through the flow path portion near the inner wall surface of the heat transfer tube 10 is changed by the spiral groove 16. The spiral direction of the fluid flowing spirally by the swirl flow path 15 is the same. Therefore, the flow of fluid is smooth in the entire flow path in the heat transfer tube 10, and a high-performance heat exchange device can be realized with a small flow path resistance.

  Further, since the spiral pitch P2 of the spiral groove 16 is substantially the same as the spiral pitch P1 of the torsion tube 13, the water of the first fluid flows along the spiral pitch P1 of the torsion tube 13 in the swirl flow path in the heat transfer tube. 15, the fluid flowing in the flow path portion near the inner wall surface of the heat transfer tube 10 flows along the spiral pitch P <b> 2 of the spiral groove 16. Since it synchronizes with the flow, the entire flow of the first fluid is smooth over the entire flow path in the heat transfer tube, and a high-performance heat exchange device can be provided with low flow resistance.

  In addition, since the lead angle α formed by the spiral groove 16 and the axial direction of the heat transfer tube 10 is 20 degrees or less, the lead angle is small, and therefore the flow angle flows near the inner wall surface of the heat transfer tube 10. When the fluid flows along the spiral pitch P2 of the spiral groove 16, the flow resistance can be suppressed small.

  Thus, by providing the spiral groove 16 on the inner wall surface of the heat transfer tube 10, a high-performance heat exchange device with low manufacturing cost and reduced pressure loss, and a high-efficiency heat pump hot water supply using the heat exchange device An apparatus can be provided.

  In the first embodiment, two fluted double tubes are used, but the same effect can be obtained even when there are two or more fluted tubes.

  Further, although the first fluid is carbon dioxide refrigerant and the second fluid is water, the same effect can be obtained by using other fluids.

  Although the water heated in the water channel is transported to the hot water storage tank, after the water flowing in the water channel is heated to a predetermined temperature, it does not flow to the hot water storage tank and is directly supplied to the hot water tap used by the user. May be.

  As described above, the heat exchange device according to the present invention and the heat pump cycle hot water supply device using the heat exchange device are low in production cost and have a high performance heat exchange device that suppresses pressure loss, and is used as a refrigerant-water heat exchanger. The high-efficiency heat pump hot water supply apparatus used can be provided.

  In addition, it can be widely applied to applications such as heat exchange and heat transfer.

(A) is side surface sectional drawing of the heat exchanger tube of the heat exchange apparatus in Embodiment 1 of this invention. (B) is a twisted pipe component figure enclosed in the heat exchanger tube. Side view of essential parts of heat exchange apparatus according to Embodiment 1 of the present invention 2A is a cross-sectional view taken along the line AA shown in FIG. 2, FIG. 2B is a cross-sectional view taken along the line BB shown in FIG. 2, and FIG. 2C is a cross-sectional view taken along the line CC shown in FIG. The block diagram of the heat pump hot-water supply apparatus using the same heat exchange apparatus in Embodiment 1 of this invention (A) is a block diagram of a conventional heat exchange device (b) is a diagram showing a helical twist tape of the heat exchange device

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Heat transfer tube 11, 12 Grooved double tube 11a, 12a Outer tube 11b, 12b Inner tube 13 Torsion tube 16 Spiral groove 17 Compressor 18 Radiator 19 Decompressor 20 Heat absorber P1 Twist pitch of torsion tube P2 Spiral groove Spiral pitch

Claims (5)

An outer tube, an inner tube located within the outer tube, a grooved double tube formed by close contact between the outer tube and the inner tube, and a plurality of the grooved double tubes. A torsion tube that is twisted so as to be intertwined in a spiral manner, and a heat transfer tube that encloses the torsion tube , a spiral groove is provided on the inner wall surface of the heat transfer tube, and the spiral shape of the heat transfer tube The spiral direction of the groove is the same as the spiral direction of the torsion tube, and the spiral pitch of the spiral groove of the heat transfer tube is substantially the same as the spiral pitch of the torsion tube, and the inner wall of the heat transfer tube and the twist A heat exchange device characterized in that a spiral swirl passage is formed between an outer wall of a tube . The heat exchange device according to claim 1 , wherein a lead angle formed by a spiral groove provided on an inner wall of the heat transfer tube with an axial direction of the tube is 20 degrees or less. The heat exchange device according to claim 1 or 2 , wherein the second fluid flowing through the inner pipe and the first fluid flowing through the heat transfer pipe are opposed to each other. A heat pump water heater using the heat exchange device according to any one of claims 1 to 3 , further comprising a heat pump cycle device having a compressor and a heat radiator. The heat pump hot water supply apparatus according to claim 4 , wherein the refrigerant is carbon dioxide and the pressure is equal to or higher than a critical pressure.