JP2002323291A - Heat exchanger and heat pump type water heater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat exchanger, capable of obtaining a satisfactory heat exchange efficiency. SOLUTION: The heat exchanger 27 for water heating comprises a heat exchange unit 1, having spirally wound refrigerant tubes 3 and water tubes 4, in such a manner that the spiral part 3A of the tube 3 and the spiral part 4A of the tube 4 are arranged, so as to be contacted with each other in a spiral- axis X direction and formed to be compressed and fixed in the spiral-axis X direction; the tube 3 is formed of an Al material and has a flat shaped section; the tube 4 is formed of a Cu material and has a circular shaped section. These tube 3 and the tube 4 are respectively compressed in compression directions Xa and Xb along the axial direction X, and the tube 4 is deformed, while being collapsed by the tube 3 with the tube 3 being contacted closely with the tube 4 to increase the contact area.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spiral tube in which a plurality of tubes are wound along a helical axis, and both tubes are alternately arranged along the helical axis direction, and are fixedly formed by being compressed in the helical axis direction. To a heat exchanger and a heat pump water heater.

[0002]

2. Description of the Related Art For example, a heat exchanger used in a heat pump type hot water supply apparatus and the like is a tube contact laminated type heat exchanger. This heat exchanger generally has a plurality of tubes having a flat tubular cross section wound in a spiral shape, which are alternately arranged along the spiral axis direction and fixed in the spiral axis direction, and one tube and the other are fixed. Is known in which the tube is closely attached.

In this type of heat exchanger, by increasing the contact area between one tube and the other tube, the heat transfer between the tubes is improved and the heat exchange performance is improved.

[0004] In order to increase the contact area, a hydraulic expansion tube is conventionally known. In this hydraulic expansion, the pipe is expanded by applying hydraulic pressure to the pipe, and the contact area between the pipe and the pipe is increased.

[0005]

However, in the case of the hydraulic expansion, there is a problem that the pipe expanded after pressurization returns to the direction before pressurization although a little, and the contact area is reduced.

Accordingly, an object of the present invention is to eliminate the above-mentioned problems of the prior art, increase the contact area between tubes, and improve the heat transfer between the tubes. And a heat pump water heater.

[0007]

According to the first aspect of the present invention,
In a heat exchanger in which a heat exchanger includes a plurality of tubes wound in a spiral shape, and the helical portions of the tubes are arranged alternately in the axial direction and brought into pressure contact, one tube crushes the other tube. It is characterized in that it has a configuration in which the two tubes come into close contact with each other while being deformed.

According to a second aspect of the present invention, in the first aspect, one tube is a tube having a flat cross-sectional shape, and the other tube is a tube having a circular cross-sectional shape.

The invention described in claim 3 is the first or second invention.
In the above-described one, the cross section of the one tube is processed so as to have a recess.

[0010] The invention according to claim 4 is the invention according to claims 1 to 3.
Wherein one of the tubes is formed of a material that is relatively hard to deform, and the other tube is formed of a material that has a lower rigidity than the one tube and is relatively deformable. I do.

According to a fifth aspect of the present invention, there is provided a coat pump unit having a compressor, a heat pump heat exchanger and a hot water supply heat exchanger, and a hot water supply tank for storing water heated by the hot water supply heat exchanger. In the heat pump hot water supply device provided, the hot water supply heat exchanger includes a spirally wound refrigerant tube and a spirally wound water tube, and the spiral portions of the respective tubes are alternately arranged in the axial direction and pressed. The heat exchanger brought into contact with the heat exchanger, wherein one of the tubes is deformed while being crushed by the other tube, so that both tubes come into close contact with each other.

According to a sixth aspect of the present invention, in the fifth aspect, the refrigerant pipe is a pipe having a flat cross section, and the water pipe is a pipe having a circular cross section.

The invention according to claim 7 is the invention according to claim 5 or 6.
In the above description, the cross section of the refrigerant pipe is processed to have a recess.

[0014] The invention according to claim 8 provides the invention according to claims 5 to 7.
Wherein the refrigerant pipe is formed of a material that is relatively hard to deform, and the water pipe is formed of a material that has a lower rigidity than the refrigerant pipe and is relatively deformable.

[0015]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 shows an embodiment of a heat pump hot water supply apparatus to which a heat exchanger according to the present invention is applied,
It is a circuit diagram at the time of heating the water in a hot-water supply tank, and storing hot water in the same tank.

As shown in FIG. 1, the heat pump type hot water supply apparatus 10 includes a heat pump unit 11, a hot water supply unit 12, a faucet 13, a bathtub 14, and control devices 15A and 15B.

The heat pump unit 11 includes the compressor 1
6. A hot water supply heat exchanger 27, a heat pump heat exchanger 18, and an accumulator 17 are sequentially arranged in the refrigerant pipe 19. The compressor 16 compresses a refrigerant containing a large amount of carbon dioxide.

The hot water supply heat exchanger 27 has a refrigerant pipe 3 for introducing a refrigerant and a water pipe 4 for introducing hot water or water, and the refrigerant pipe 3 and the water pipe 4 are in contact with each other. The refrigerant discharged from the compressor 16 is introduced into the refrigerant pipe 3.
The contact between the refrigerant pipe 3 and the water pipe 4 causes the refrigerant pipe 3
The hot water or water flowing through the water pipe 4 is heated by the heat of condensation of the refrigerant flowing through the water pipe 4.

The hot water supply unit 12 has a hot water supply tank 26, a bath tub heat exchanger 28, a faucet hot water supply line 71, a bath tub pouring line 72, and the like.

The hot water supply tank 26 is provided with the heat exchanger 2 for hot water supply.
7 is used to store water (hot water) heated by refrigerant heat. The hot water supply tank 26 and the hot water supply heat exchanger 27
The water pipe 4 is connected via a hot water supply water pipe 36. Hot water or water in the hot water supply tank 26 is introduced into the water pipe 4. The hot water supply water pipe 36 includes a flow meter 33, a hot water circulation pump 34, a flow control valve 35,
The switching solenoid valve 73, the second switching solenoid valve 74, and the drain cock 42 are provided.

A first tap water pipe 38 provided with a pressure reducing check valve 37 is connected to the bottom 26B of the hot water supply tank 26.
Tap water can always be supplied into the hot water supply tank 26. Therefore, the tap water pressure always acts in the hot water supply tank 26. A hot water outlet pipe 40 having a pressure relief valve 39 is connected to the top 26A of the hot water supply tank 26.

When storing hot water in the hot water supply tank 26,
The first switching solenoid valve 73 and the second switching solenoid valve 74 are opened. In this case, as shown by the thick line in FIG. 1, a hot-water supply water circulation circuit N in which water circulates through the hot-water supply tank 26 and the hot-water supply heat exchanger 27 is configured.

When the hot water circulation pump 34 operates,
The water at the bottom 26B of the hot water supply tank 26 is
To the water pipe 4. The water flowing through the water pipe 4 is heated by the heat of condensation of the refrigerant flowing through the refrigerant pipe 3. The flow rate of the heated water (hot water) is adjusted by a flow rate adjusting valve 35, and the hot water tank 2 passes through both switching solenoid valves 73 and 74.
6 to the top 26A. In the hot water supply tank 26, for example, hot water of about 60 to 90 ° C. can be stored.

The bathtub heat exchanger 28 is heated by the hot water supply heat exchanger 27 and heats or reheats the hot water or water in the bathtub 14 by the heat of the hot water in the hot water supply water pipe 36.
To keep it warm.

The bathtub heat exchanger 28 has an introduction water pipe 75 for leading hot water in the hot water supply water pipe 36 and a first bathtub water pipe 51 for leading hot water or water in the bathtub 14. Hot water or water flowing through the inside of the introduced water pipe 75 and the inside of the first bath water pipe 51 is heat-exchanged by the contact between the introduced water pipe 75 and the first bathtub water pipe 51.

One end of the feed water pipe 75 is connected between the first switching solenoid valve 73 and the hot water supply heat exchanger 27 in the hot water supply water pipe 36. The other end of the introduction water pipe 75 is connected between the first switching solenoid valve 73 and the second switching solenoid valve 74 in the hot water supply water pipe 36. When the first switching electromagnetic valve 73 is closed, hot water or water flowing out of the hot water supply heat exchanger 27 and flowing through the hot water supply water pipe 36 is introduced into the introduction water pipe 75.
An inlet water circuit O (thick line in FIG. 2) is introduced into the inside and returned to the hot water supply water pipe 36 again through the bathtub heat exchanger 28. In the hot water supply water pipe 36, a portion between the first switching electromagnetic valve 73 and the second switching electromagnetic valve 74 and an intermediate position 26C between the top portion 26A and the bottom portion 26B of the hot water supply tank 26 are connected via a switching bypass pipe 77. Connected. The switching bypass pipe 77 includes a third switching solenoid valve 76,
When the third switching electromagnetic valve 76 is opened, the hot water supply water pipe 36 and the hot water supply tank 26 are communicated.

The first bathtub water pipe 51 communicates the bathtub heat exchanger 28 with the bathtub 14. This first
The bathtub water pipe 51 includes a bathtub circulation pump 46, a filter 47, a water level sensor 48, a thermistor 49, and a flow switch 50. The first bathtub water pipe 51 constitutes a bathtub water circulation circuit P in which hot water or water circulates between the bathtub heat exchanger 28 and the bathtub 14.

The faucet hot water supply line 71 is connected to the faucet 13.
Is connected to hot water supply tank 26 by hot water supply pipe 59 having mixing control valve 57 and flow sensor 58 and hot water supply pipe 40. Since the tap water pressure is constantly acting on the hot water supply tank 26 via the first tap water pipe 38,
By opening the faucet 13, hot water in the hot water supply tank 26 can be supplied to the faucet 13.

The flow sensor 58 detects the amount of hot water flowing in the hot water supply pipe 59. Further, the first tap water pipe 3 is connected to the mixing control valve 57 through a second tap water pipe 62.
Tap water from 8 is introduced. Therefore, the mixing control valve 57
Is opened, the hot water from the hot water supply tank 26 and the tap water pipe 40 and the tap water from the second tap water pipe 62 are mixed, and the hot water supplied from the faucet 13 can be adjusted to about 60 ° or less.

The bathtub pouring line 72 connects the hot water supply pipe 59 and the first bathtub water pipe 51 to the second bathtub water pipe 6.
And hot water supply tank 2
The hot water in 6 can be poured into the bathtub 14.

A flow sensor 64, a pouring solenoid valve 65, a relief means 66, and a check valve 67 are provided in the second bathtub water pipe 68.

When pouring water from the hot water supply tank 26 into the bathtub 14, the pouring solenoid valve 65 is opened with the bathtub circulation pump 46 stopped. In this case, the hot water in the hot water supply tank 26 flows through the hot water supply pipe 40, a part of the hot water supply pipe 59, and the second bathtub water pipe 68 to reach the first bathtub water pipe 51, and the first bathtub water pipe 51 Flow switch 5
0, thermistor 49, water level sensor 48, and filter 47
Is poured into the bath 14 through the bath.

When the water level sensor 48 detects that an appropriate amount of hot water has been poured from the hot water supply tank 26 into the bathtub 14, the pouring solenoid valve 65 is closed. Thereafter, the temperature of the hot water in the bathtub 14 dropped below an appropriate temperature.
9, the hot water supply circulation pump 34 and the bathtub circulation pump 46 operate, the first switching electromagnetic valve 73 and the second switching electromagnetic valve 74 are closed, and the third switching electromagnetic valve 7 is closed.
6 is opened and the compressor 1 of the heat pump unit 11 is opened.
6, the hot water supply heat exchanger 27 heats the hot water or water flowing in the hot water supply water circulation circuit N by the refrigerant heat, and the bath tub heat exchanger 28 supplies the hot water or water flowing in the hot water supply water circulation circuit N. Then, the hot water or the water flowing in the bath water circulation circuit P and the introduction water circuit O is exchanged with heat to heat (reheat) the hot water or the water in the bath tub 14 and keep the hot water in the bath tub 14 warm.

As described above, the hot water supply tank 26 to the bathtub 14
An operation of pouring an appropriate amount of hot water at an appropriate temperature into the bath tub and heating the hot water in the bath tub 14 to a suitable temperature by the heat exchanger 27 for hot water supply and the heat exchanger 28 for the bath tub for a predetermined period of time to perform the heat retaining operation is performed. Called automatic operation.

The control device 15A is installed in the heat pump unit 11 and controls the operation (including capacity control) and stop of the compressor 16. The control device 15B
Is installed in the hot water supply unit 12, and the hot water circulation pump 3
4, the operation or stop of the bathtub circulation pump 46, the first switching solenoid valve 73, the second switching solenoid valve 74, and the third switching solenoid valve 7.
6. The opening and closing of the pouring solenoid valve 65 and the opening of the flow control valve 35 and the mixing control valve 57 are controlled. This control device 15B
Is capable of bidirectional communication with the control device 15A of the heat pump unit 11 and is connected to the remote controller 79 in a wired or wireless state.

In this embodiment, the hot water supply heat exchanger 27 is
As shown in FIG. 3, it is configured to include a heat exchange section 1, holding members 5, 6, and a center bolt 7.

The heat exchange section 1 has a refrigerant pipe 3 for introducing a refrigerant and a water pipe 4 for introducing hot water or water. The refrigerant pipe 3 and the water pipe 4 are spirally wound in a spiral axis X direction. The helical portion 3A of the refrigerant tube 3 and the helical portion 4A of the water tube 4 are arranged so as to alternately contact each other in the helical axis X direction.

The refrigerant pipe 3 is made of a material which is relatively difficult to deform.
For example, the tube is made of aluminum (Al) and has a flat cross-sectional shape. Since the refrigerant flows inside the refrigerant pipe 3, it is preferable that the pipe is made of a material that is unlikely to undergo pressure deformation due to the pressure of the refrigerant. The water pipe 4 is formed of a material that is relatively easily deformed, for example, a material having a lower rigidity than the refrigerant pipe 3 such as a copper (Cu) material, and has a circular cross section. Here, it is desirable that the cross-sectional shape of the water pipe 4 is a relatively convex shape, and the raised portion has a smooth bend.

At both ends of the heat exchange section 1, holding members 5,
6, the center of the holding members 5 and 6 is fastened by a center bolt 7 to fix the heat exchange unit 1 in the helical axis X direction.

By tightening the center bolt 7, the holding members 5 and 6 compress the heat exchange section 1 in the compression directions Xa and Xb along the helical axis X. At this time, FIG.
As shown in a, the water pipe 4 is deformed so as to conform to the flat cross section of the refrigerant pipe 3 having higher rigidity than the water pipe 4 while being crushed in the compression directions Xa and Xb, thereby forming a flat cross section. Then, the refrigerant pipe 3 and the water pipe 4 are brought into close contact with each other, and the contact area is increased.

Here, the refrigerant pipe 3 may be a pipe processed so as to have a recess in its cross section. In this case, when the heat exchange unit 1 is compressed in the compression directions Xa and Xb, as shown in FIG. 4B, the contact surfaces of the water pipe 4 and the refrigerant pipe 3 mesh with each other, so that the contact surfaces are less likely to shift and the contact area is reduced. Is increased.

As described above, according to the above-described embodiment, the heat exchanger 27 for hot water supply has its heat exchange unit 1 compressed in the helical axis X direction, and Since the helical portion 4A of the water pipe 4 is formed by pressure bonding, the contact area between the refrigerant pipe 3 and the water pipe 4 increases, and the refrigerant pipe 3 does not reduce the contact area after pressurization as in a hydraulic expansion pipe. The heat transfer between the refrigerant pipe 3 and the water pipe 4 is improved, and the heat exchange efficiency between the refrigerant flowing through the refrigerant pipe 3 and the hot water or water flowing through the water pipe 4 can be improved. Further, the number of manufacturing steps is reduced as compared with the case where the hydraulic expansion is performed, and the cost can be reduced.

Although the present invention has been described based on the above embodiment, the present invention is not limited to this.

The hot water supply heat exchanger 27 includes a refrigerant pipe 3 and a water pipe 4.
The tube may have any shape. However, it is desirable that the cross section of the water pipe 4 is relatively convex, and the raised portion has a smooth bend.

The hot water supply heat exchanger 27 may be applied to the bath heat exchanger 28 (water-to-water heat exchanger) of the heat pump hot water supply apparatus 10. In this case, the inlet water pipe 75 of the bathtub heat exchanger 28 may be a pipe formed of a material (for example, Cu material) having the same rigidity (Young's modulus).

This is because hot water flows through the introduction water pipe 75, so that the pressure is lower than that of the compressed refrigerant, and the introduction water pipe 75 hardly undergoes pressure deformation.

[0047]

According to the present invention, the heat exchanger has a structure in which one of the tubes is deformed while the other tube is crushed by the other tube so that the two tubes come into close contact with each other. The contact area increases, the heat transfer between one tube and the other tube improves, and the heat exchange performance of the heat exchanger improves.

[Brief description of the drawings]

FIG. 1 is a circuit diagram showing an embodiment of a heat pump type hot water supply apparatus to which a heat exchanger according to the present invention is applied, which heats water in a hot water supply tank and stores the hot water in the tank.

FIG. 2 is a circuit diagram of the heat pump type hot water supply apparatus of FIG. 1 when hot water or water in a bathtub is heated (reheated) and kept warm.

FIG. 3 is a structural sectional view showing an embodiment of a heat exchanger according to the present invention.

FIG. 4 is a cross-sectional view of a tube of a heat exchange unit in the heat exchanger of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Heat exchange part 3 Refrigerant pipe 3A spiral part 4 Water pipe 4A spiral part 27 Heat exchanger for hot-water supply X Helical shaft Xa Compression direction Xb Compression direction

Continuing from the front page (72) Inventor Kiyoshi Oyama 1 Otsukicho, Ashikaga, Tochigi Prefecture Sanyo Electric Air Conditioning Co., Ltd. (72) Inventor Yoshinori Toya 1 Otsukicho, Ashikaga City, Tochigi Pref. Inventor Masanobu Saito 1 Otsuki-cho, Ashikaga-shi, Tochigi Sanyo Electric Air Conditioning Co., Ltd. 1 Otsuki-cho, Ashikaga-shi, Tochigi Sanyo Electric Air Conditioning Co., Ltd. F-term (reference) 3L036 AA04 AA07 3L103 AA37 BB43 CC02 CC40 DD05 DD32 DD36

Claims (8)

[Claims] 1. A heat exchanger comprising a plurality of helically wound tubes, wherein helical portions of the respective tubes are alternately arranged in the axial direction and brought into pressure contact with each other, wherein one tube crushes the other tube. A heat exchanger having a configuration in which both tubes are deformed while being brought into close contact with each other. 2. The heat exchanger according to claim 1, wherein one of the tubes has a flat cross-sectional shape, and the other tube has a circular cross-sectional shape. 3. The heat exchanger according to claim 1, wherein a cross section of one of the tubes is processed to have a recess. 4. The method according to claim 1, wherein one of the tubes is made of a material that is relatively hard to deform, and the other tube is made of a material that has a lower rigidity than the one tube and is relatively easy to deform.
4. The heat exchanger according to any one of claims 1 to 3. 5. A heat pump water heater including a compressor, a heat pump heat exchanger, a coat pump unit having a heat exchanger for hot water supply, and a hot water tank for storing water heated by the heat exchanger for hot water supply. A heat exchanger in which the hot water supply heat exchanger includes a spirally wound refrigerant tube and a spirally wound water tube, and the spiral portions of the respective tubes are alternately arranged in the axial direction and brought into pressure contact. A heat pump hot water supply apparatus, wherein one of the tubes is deformed while being crushed by the other tube so that both tubes come into close contact with each other. 6. The heat exchanger according to claim 5, wherein the refrigerant pipe is a pipe having a flat cross section, and the water pipe is a pipe having a circular cross section. 7. The heat pump hot water supply apparatus according to claim 5, wherein a cross section of the refrigerant pipe is processed to have a recess. 8. The refrigerant pipe according to claim 5, wherein the refrigerant pipe is formed of a material that is relatively hard to deform, and the water pipe is formed of a material that has a lower rigidity than the refrigerant pipe and is relatively easy to deform. The heat pump water heater according to any one of the preceding claims.