TWI596305B - Heat exchanger device of gas heater and operation method thereof - Google Patents

Description

Heat exchanger device for gas water heater and use method thereof

The invention provides a heat exchanger device for a gas water heater and a using method thereof, in particular to a heat exchanger device for a gas water heater which can reduce the occurrence of dew condensation and achieve better thermal efficiency and a using method thereof.

The conventional water heater is an indispensable device for the current home life. As far as the energy used is concerned, it can be roughly classified into a gas water heater, an electric water heater and a solar water heater, and the gas water heater is widely used by the general public.

The conventional gas water heater is provided with a fan, a burner and a heat exchanger inside the body, and the heat exchanger is connected with a cold water pipe and a hot water pipe, and the cold water pipe and the hot water pipe can form a water passage, the cold water pipe One end has a cold water inlet that can be connected to a suitable water source for input of cold water to be heated. One end of the hot water pipe has a hot water outlet, and cold water to be heated can be input from the cold water inlet and the cold water pipeline, so that the cold water is sent to the heat exchanger, the cold water enters the heat exchanger for heat exchange, and then the hot water pipeline and the hot water outlet Hot water is output for use.

However, conventional heat exchangers are prone to condensation when used, causing corrosion or damage to components inside the gas water heater. Furthermore, if the condensation is to be improved, the thermal efficiency needs to be lowered, and the heat absorption effect of the heat exchanger is not good, and the thermal efficiency of the gas water heater cannot be effectively improved.

In summary, the present inventors have felt that the above-mentioned defects can be improved, and the present invention has been put forward with great interest in designing and cooperating with the theory, and finally proposes a invention which is reasonable in design and effective in improving the above-mentioned defects.

The technical problem to be solved by the present invention is to provide a heat exchanger device for a gas water heater and a method for using the same, which can reduce the occurrence of condensation and at the same time achieve a better thermal efficiency of the gas water heater.

In order to solve the above technical problem, the present invention provides a heat exchanger device for a gas water heater, the heat exchanger device being disposed in a gas water heater, the heat exchanger device having a plurality of fins disposed at intervals and being disposed a water pipe of the fin, each of the fins is provided with a plurality of perforations, the perforations are distributed in the upper half and the lower half of the fins, and the water pipes are pierced through the perforations of the fins; each fin is defined The five perforations on the sheet are a perforating unit, and the perforating unit includes a first perforation, a second perforation, a third perforation, a fourth perforation and a fifth perforation, and the first perforation and the second perforation are adjacent to each other. The third through hole, the fourth through hole and the fifth through hole are disposed adjacent to the lower half of the fin, and the first through hole is located between the third through hole and the fourth through hole. The second through hole is located above the middle of the fourth through hole and the fifth through hole; wherein the first through hole, the third through hole and the center line of the fourth through hole have a first line Fluid diameter, defining the first fluid diameter as D E1, the center line connecting the first through hole, the third through hole and the fourth through hole is surrounded by a first area, the area of the first area is a first area, and the circumference of the first area is a first circumference Defining the first area as A1, the first circumference is P1; the second perforation, the fourth perforation, and the center line of the fifth perforation have a second fluid diameter therebetween, defining the second fluid The diameter of the second hole, the fourth hole, and the center line of the fifth hole are surrounded by a second area, the area of the second area is a second area, and the circumference of the second area is a second a circumference defining a second area of A2, the second circumference being P2; and the first perforation, the second perforation, and the fourth wearing a third fluid diameter is defined between the center point of the hole, and the third fluid has a diameter of De3, and the center line of the first hole, the second hole and the fourth hole is surrounded by a third area. The area of the third area is a third area, the circumference of the third area is a third circumference, and the third area is defined as A3, and the third circumference is P3; the following relationship condition is satisfied: De1=4×( A1/P1), De2=4×(A2/P2), De3=4×(A3/P3).

In order to solve the above technical problem, the present invention also provides a method for using a heat exchanger device for a gas water heater, comprising the steps of: providing a gas water heater having the heat exchanger device, the gas water heater further having a fan and a burner; and starting the gas water heater to ignite the burner, the burner generating a high temperature combustion gas, the combustion gas passing through the first region, the second region and the third region to cause the combustion gas The fins and water pipes of the heat exchanger device are contacted such that water in the water pipe flowing through the heat exchanger device is heated.

The present invention has at least the following advantages: in accordance with the special design of the heat exchanger device described above, it is possible to reduce the occurrence of condensation and at the same time achieve a better thermal efficiency of the gas water heater. The invention divides the heat exchanger device into upper and lower regions, and the temperature rise ratio in the upper and lower water pipes can reach 1:2~1:4, so as to increase the water temperature in the upper drain pipe to reduce the occurrence of condensation. The invention can achieve the better thermal efficiency of the gas water heater, thereby reducing the heating time and avoiding the waste of gas energy.

For a better understanding of the features and technical aspects of the present invention, reference should be made to the accompanying drawings.

1‧‧‧ body

2‧‧‧Fan

3‧‧‧ burner

4‧‧‧ heat exchanger unit

41‧‧‧Fins

411‧‧‧Perforation

412‧‧‧ convex

413‧‧‧ inlet

414‧‧‧ gas outlet

415‧‧‧ eddy current generator

416‧‧‧ eddy current generator

417‧‧‧ eddy current generator

42‧‧‧ water pipes

5‧‧‧ cold water pipeline

51‧‧‧ cold water inlet

6‧‧‧ hot water pipeline

61‧‧‧hot water outlet

7‧‧‧Water Volume Detector

8‧‧‧Control unit

H‧‧‧Perforation unit

H1‧‧‧first perforation

H2‧‧‧second perforation

H3‧‧‧ third perforation

H4‧‧‧fourth perforation

H5‧‧‧ fifth perforation

B1‧‧‧ first area

B2‧‧‧Second area

B3‧‧‧ third area

De1‧‧‧First fluid diameter

De2‧‧‧Second fluid diameter

De3‧‧‧ third fluid diameter

Pt1, Pt2, Pt3‧‧‧ spacing

Do‧‧‧diameter

Fp‧‧‧ spacing

TL‧‧‧ spacing

RL‧‧‧ spacing

TW‧‧‧ length

RW‧‧‧ length

TH‧‧‧ Height

RH‧‧‧ Height

Ψ‧‧‧角角

Ψ‧‧‧角角

1 is a schematic plan view of a gas water heater of the present invention.

Figure 2 is a perspective view of a fin of the heat exchanger device of the present invention.

Figure 3 is a front elevational view of the fin of the heat exchanger device of the present invention.

Figure 4 is a schematic illustration of a perforating unit of a heat exchanger device of the present invention.

Figure 5 is a schematic illustration of a vortex generator of the present invention.

Figure 6 is a schematic illustration of another vortex generator of the present invention.

Figure 7 is a flow chart of a method of using the heat exchanger device of the present invention.

[First Embodiment]

Referring to FIG. 1, the present invention provides a heat exchanger device for a gas water heater, which includes a body 1, a fan 2, a burner (fire row) 3, and a heat exchanger device 4. The body 1 is a hollow casing, and the fan 2, the burner 3 and the heat exchanger device 4 are disposed inside the body 1. The position of the fan 2, the burner 3 and the heat exchanger device 4 is not limited, and may be required And change it. In the present embodiment, the fan 2, the burner 3, and the heat exchanger device 4 are disposed in the interior of the body 1 from bottom to top, and the burner 3 is located between the fan 2 and the heat exchanger device 4. When the burner 3 is ignited, the burner 3 can generate a high-temperature combustion gas, the combustion gas is pushed upward, and the combustion gas contacts the heat exchanger device 4, thereby performing a heat exchange operation so as to flow through the heat exchanger device 4. The water can be heated from a normal temperature to a high temperature, and then discharged to use hot water.

The heat exchanger device 4 is connected to a cold water pipe 5 and a hot water pipe 6, and the cold water pipe 5 and the hot water pipe 6 constitute a water passage, and the heat exchanger device 4 is connected to the cold water pipe 5 and the hot water pipe 6. between. One end of the cold water pipe 5 has a cold water inlet 51, which can be connected to a suitable water source for inputting cold water to be heated, and the cold water pipe 5 can also be provided with a water amount detecting device 7 for detecting water inflow. The amount of water. One end of the hot water pipe 6 has a hot water outlet 61. The gas water heater may further comprise a control unit 8, such as a fan 2 and a burner 3, electrically connected to the control unit 8 for controlling the combustion condition with the control unit 8 to generate hot water.

Referring to FIG. 1 to FIG. 3 , the heat exchanger device 4 has a plurality of fins 41 disposed at intervals and a water pipe 42 disposed through the fins 41 , the fins 41 and the water pipe 42 . It is made of a high heat conductive material (such as copper), and one end of the water pipe 42 is connected to the cold water pipe 5, and the other end is connected to the hot water pipe 6, so that the water pipe 42 is connected between the cold water pipe 5 and the hot water pipe 6. The cold water to be heated can be input from the cold water inlet 51 and the cold water line 5, and the cold water can be sent to the heat exchanger unit 4, the cold water enters the heat exchanger unit 4 for heat exchange, and then the hot water line 6 and the hot water outlet 61 output heat. Water for the user to use.

Referring to FIG. 2 and FIG. 3 , the heat exchanger device 4 can be a split fin design. The fins 41 are substantially rectangular. The fins 41 are respectively provided with a plurality of through holes 411 , and the through holes 411 . It may be distributed in the upper half and the lower half of the fin 41, and the number of the through holes 411 is not limited, for example, five or seven or the like. The water pipe 42 is disposed in the through hole 411 of the fins 41, and the water pipe 42 and the through hole 411 are also soldered. The fins 41 absorb the heat energy of the combustion gas, causing the fins 41 to generate high temperature and heat, so as to exchange heat with the water in the water pipe 42, so that the water pipe 42 can be used for discharging hot water.

A plurality of convex portions 412 are formed on the fins 41, and the convex portions 412 protrude from one surface of the fins 41 such that the convex portions 412 have an appropriate height to form a one-way split convex portion. The protrusions 412 may also protrude from both sides of the fin 41 to form a bidirectional slit protrusion. In the embodiment, the protrusions 412 are disposed at the upper half and the middle of the fin 41, but are not limited. The protrusions 412 may also be disposed in the lower half of the fins 41, or the entire fins 41. On the appropriate location.

The protrusions 412 can be rectangular, trapezoidal or the like. In the embodiment, the protrusions 412 are mostly trapezoidal, and the trapezoidal protrusions 412 are adjacent to the through holes 411. The matching holes 411 are designed to be trapezoidal to increase the area thereof. An air inlet 413 and an air outlet 414 are respectively formed between the lower edge and the upper edge of the convex portion 412 and the fin 41. The convex portion 412 is connected to the fin 41 on both sides, and one or both sides of the convex portion 412 are Set diagonally. Since the configuration of the convex portion 412 is the same as the prior art, and the present invention does not limit the configuration of the convex portion 412, it will not be described again.

The fins 41 are respectively provided with a plurality of eddy current generators 415, 416 and 417, which are respectively provided. It may protrude from one side or the other side of the fin 41, respectively. The configurations of the eddy current generators 415, 416, and 417 are not limited, and may be, for example, rectangular, trapezoidal, or drop-shaped. In this embodiment, the eddy current generators 415 are rectangular, and the eddy current generators 415 are located above the plurality of through holes 411 of the upper half of the fins 41, that is, the eddy current generators 415 can be The strips are elongated in the horizontal direction, and the vortex generators 415 are located above the middle of the perforations 411 of the upper half of the fins 41. The eddy current generators 416 are trapezoidal, and are disposed opposite to the plurality of through holes 411, that is, the eddy current generators 416 can be disposed at opposite sides of the plurality of through holes 411 in opposite directions. The eddy current generators 417 are in the form of water droplets, and the eddy current generators 417 are located at the middle of the fins 41. The vortex generators 415, 416, and 417 can concentrate the gas to reduce the ineffective area, and the eddy current generators 415, 416, and 417 can also generate eddy currents, thereby effectively increasing the thermal efficiency of the gas water heater.

Referring to FIG. 1 to FIG. 5 , it is further defined that the diameters of the through holes 411 are do, the distance between each adjacent two fins 41 is Fp, and the eddy current generator 416 having a trapezoidal shape above the through holes 411 is a right angle trapezoid. The lower end of the vortex generator 416 has a length TW and a height TH. The angle between the lower bottom and the waist (the waist of the oblique side) is ψ, and the distance between the lower bottom of the eddy current generator 416 and the center of the through hole 411 is TL. The angle between the imaginary line of the hole 411 and perpendicular to the lower bottom of the eddy current generator 416 is Ψ, which satisfies the following relationship condition: TL=do+2.2~do+4

TH=0.7FP~0.82FP

Ψ=25°~47°

ψ=24°~48°

TW=0.45do~0.66do

Among them, the unit of TL, TH, FP, TW, and do is mm.

Referring to FIG. 1 to FIG. 6 , it is further defined that the diameters of the through holes 411 are do, and the distance between each adjacent two fins 41 is Fp, and is located above the plurality of through holes 411 of the upper half of the fin 41 . a rectangular vortex generator 415 having a length of RW and a height For RH, the distance between the bottom of the eddy current generator 416 and the virtual line passing through the center of the perforations 411 of the upper half of the fin 41 is RL, which satisfies the following relationship condition: RL=0.68do~0.8do

RW=0.63do~0.75do

RH=0.7FP~0.84FP

Among them, the unit of RL, RW, RH, FP, and do is mm.

Referring to FIG. 4 , each of the five through holes 411 of each of the fins 41 is defined as a perforating unit H. The perforating unit H includes a first through hole h1 , a second through hole h2 , a third through hole h3 , and a fourth portion . a first through hole h1 and a second through hole h2 are disposed adjacent to the upper half of the fin 41, and the third through hole h3, the fourth through hole h4, and the fifth through hole h5 are adjacently disposed on the fin In the lower half of 41, the first perforation h1 is located above the middle of the third perforation h3 and the fourth perforation h4, and the second perforation h2 is located above the middle of the fourth perforation h4 and the fifth perforation h5. The first through hole h1 and the second through hole h2 may be located at the same level, and the third through hole h3, the fourth through hole h4, and the fifth through hole 45 may be located at the same level.

Wherein, the first hole diameter, the third hole h3 and the fourth hole h4 have a first fluid diameter between the center line connecting lines, and the first fluid diameter is defined as De1. The center line of the first through hole h1, the third through hole h3, and the fourth through hole h4 is connected to form a first area B1. The area of the first area B1 is a first area, and the circumference is a first circumference. The first area is A1, and the first circumference is P1.

The second perforation h2, the fourth perforation h4 and the fifth perforation 45 have a second fluid diameter between the center line connecting lines, defining the second fluid diameter as De2, the second perforation h2, the fourth perforation h4 and the fifth perforation The center point of 45 is surrounded by a second area B2, the area of the second area B2 is a second area, the circumference is a second circumference, and the second area is defined as A2, and the second circumference is P2 . The first area B1 and the second area B2 may be the same or symmetric.

A third fluid diameter is defined between the center line connecting the first through hole h1, the second through hole h2 and the fourth through hole h4, and the third fluid diameter is De3, and the first through hole h1 is defined. A center line connecting the second through hole h2 and the fourth through hole h4 is surrounded by a third area B3. The area of the third area B3 is a third area, and the circumference is a third circumference. The third area is defined as A3. The third perimeter is P3.

According to Kern Method

Nu=h‧De/k

De=4. Runner area/wetting perimeter

The present invention satisfies the following relationship condition: De (fluid diameter) = 4 x (A/P), where A is the area of each region, and P is the circumference of each region.

Specifically, the present invention satisfies the following relational condition: De1=4×(A1/P1)

De2=4×(A2/P2)

De3=4×(A3/P3)

In addition, the preferred design range satisfies the following relationship conditions: De3/(De1+De2)=0.48~0.43

De2/(De1+De2)=0.52~0.44

In addition, the distance between the center point of the third through hole h3 and the center point of the fourth through hole h4 may be defined as Pt1, and the distance between the center point of the fourth through hole h4 and the center point of the fifth through hole h5 is Pt2, and the center of the first through hole h1 The distance between the point and the center point of the second perforation h2 is Pt3, which satisfies the following relationship condition: Pt1>Pt2>Pt3

[Second embodiment]

Referring to FIG. 7, the present invention further provides a method for using a heat exchanger device 4 for a gas water heater, comprising the following steps: First, providing a gas water heater (please refer to FIG. 1 to FIG. 6 together), the gas water heater The heat exchanger device 4 is provided; since the gas water heater and the heat exchanger device 4 are the same as the above embodiment, they will not be described again; then, the gas water heater is activated to cause the burner 3 to be ignited. Burner 3 Generating a high-temperature combustion gas, the combustion gas being pushed upward, the combustion gas passing through the first region B1, the second region B2, and the third region B3, causing the combustion gas to contact the fins 41 of the heat exchanger device 4 and The water pipe 42 is operated by heat exchange, and the combustion gas contacts the vortex generators 415, 416, and 417 to concentrate and generate eddy currents so that water flowing through the water pipe 42 of the heat exchanger device 4 is Heating, for example, from normal temperature to high temperature, is used to discharge hot water.

Therefore, according to the special design of the above heat exchanger device, it is possible to reduce the occurrence of condensation and at the same time achieve a better thermal efficiency of the gas water heater. The invention divides the heat exchanger device into upper and lower regions, and the temperature rise ratio in the upper and lower water pipes can reach 1:2~1:4, so that the heating can be concentrated in the lower region. The invention can improve the water temperature in the upper drain pipe to reduce the occurrence of condensation. The invention can achieve the better thermal efficiency of the gas water heater, thereby reducing the heating time and avoiding the waste of gas energy. The invention has been tested, the temperature rise ratio of the upper and lower rows is 1:2.1, the thermal efficiency is up to 83.02%; the temperature rise ratio of the upper and lower rows is 1:3, the thermal efficiency is up to 83.6%, and condensation and carbon deposition are less likely to occur.

The above is only the preferred embodiment of the present invention, and is not intended to limit the scope of the invention, and the equivalents of the present invention and the equivalents of the drawings are all included in the present invention. Within the scope of protection, it is given to Chen Ming.

H‧‧‧Perforation unit

H1‧‧‧first perforation

H2‧‧‧second perforation

H3‧‧‧ third perforation

H4‧‧‧fourth perforation

H5‧‧‧ fifth perforation

B1‧‧‧ first area

B2‧‧‧Second area

B3‧‧‧ third area

De1‧‧‧First fluid diameter

De2‧‧‧Second fluid diameter

De3‧‧‧ third fluid diameter

Pt1, Pt2, Pt3‧‧‧ spacing

Do‧‧‧diameter

411‧‧‧Perforation

Claims (9)

A heat exchanger device for a gas water heater, the heat exchanger device being disposed on a gas water heater, the heat exchanger device having a plurality of fins disposed at intervals and a water pipe extending through the fins, each fin Each of the plurality of perforations is disposed in the upper half and the lower half of the fins, the water pipe is disposed through the through holes of the fins; and the five perforations defined on each fin are a perforated unit. The perforating unit includes a first through hole, a second through hole, a third through hole, a fourth through hole and a fifth through hole. The first through hole and the second through hole are disposed adjacent to the upper half of the fin. The third through hole, the fourth through hole and the fifth through hole are disposed adjacent to the lower half of the fin, the first through hole is located above the middle of the third through hole and the fourth through hole, and the second through hole is located at Above the middle of the fourth through hole and the middle of the fifth through hole, the first through hole and the second through hole are at the same level, and the third through hole, the fourth through hole and the fifth through hole are at the same level; wherein First perforation, the third perforation, and the fourth a first fluid diameter is defined between the center point of the hole, and the first fluid has a diameter of De1, and the center line of the first hole, the third hole and the fourth hole is surrounded by a first area. The area of the first area is a first area, the circumference of the first area is a first circumference, and the first area is defined as A1, the first circumference is P1; the second perforation, the fourth perforation, and the a second fluid diameter is defined between the center points of the fifth perforation, and the second fluid diameter is De2, and the second perforation, the fourth perforation, and the center point of the fifth perforation are connected to form a second region. The area of the second area is a second area, the circumference of the second area is a second circumference, the second area is defined as A2, the second circumference is P2, and the first perforation, the second Between the perforation and the center point of the fourth perforation, a third fluid diameter is defined, and the third fluid diameter is defined as De3, and the center point of the first perforation, the second perforation and the fourth perforation is connected to form a first a third area, the area of the third area being a third area, the third area The perimeter is the third week, define the The third area is A3, and the third circumference is P3; the following relational conditions are satisfied: De1=4×(A1/P1), De2=4×(A2/P2), De3=4×(A3/P3). The heat exchanger device of the gas water heater of claim 1, wherein the fins are respectively provided with a plurality of vortex generators, the vortex generators are rectangular, and the vortex generators are located in the upper half of the fins. The upper part of the portion between the perforations. The heat exchanger device of the gas water heater of claim 2, wherein the vortex generators extend in a horizontal direction in an elongated shape, and the vortex generators are located in the upper half of the fins Above the middle of the perforation, the diameter of the perforations is defined as do, the distance between each adjacent two fins is Fp, the length of the vortex generator is RW, the height of the vortex generator is RH, and the bottom of the vortex generator The distance from the imaginary line passing through the center of the perforations of the upper half of the fin is RL, and the following relationship condition is satisfied: RL=0.68do~0.8do, RW=0.63do~0.75do, RH=0.7 FP~ 0.84FP. The heat exchanger device of the gas water heater of claim 1, wherein the fins are respectively provided with a plurality of vortex generators, the vortex generators are trapezoidal, and two pairs are disposed opposite to the perforations. Defining the diameters of the perforations is do, the distance between each adjacent two fins is Fp, the length of the lower bottom of the vortex generator is TW, the height of the vortex generator is TH, and the bottom and waist of the vortex generator The angle between the lower bottom of the vortex generator and the center of the perforation is TL, and the angle between the imaginary line passing through the center of the perforation and perpendicular to the lower bottom of the vortex generator is Ψ, which satisfies the following relationship Condition: TL=do+2.2~do+4, TH=0.7FP~0.82FP, Ψ=25°~47°, ψ=24°~48°, TW=0.45do~0.66do, the TL, TH The units of FP, TW, and do are mm. The heat exchanger device of the gas water heater according to claim 4, wherein the vortex generators are disposed on opposite sides of the perforations oppositely to each other in an inclined shape. The heat exchanger device of the gas water heater according to claim 1, wherein the following relationship condition is more satisfied: De3/(De1+De2)=0.48~0.43. The heat exchanger device of the gas water heater according to claim 1, wherein the following relationship condition is more satisfied: De2/(De1+De2)=0.52~0.44. The heat exchanger device of the gas water heater of claim 1, wherein a distance between a center point of the third perforation and a center point of the fourth perforation is Pt1, a center point of the fourth perforation and the fifth perforation The distance between the center points is Pt2, and the distance between the center point of the first perforation and the center point of the second perforation is Pt3, which satisfies the following relationship condition: Pt1>Pt2>Pt3. A method of using a heat exchanger device for a gas water heater, comprising the steps of: providing a gas water heater having the heat exchanger device according to any one of claims 1 to 8, the gas water heater further comprising a fan and a burner; And starting the gas water heater to ignite the burner, the burner generating a high temperature combustion gas, the combustion gas passing through the first region, the second region and the third region, causing the combustion gas to contact the heat exchange The fins and water tubes of the device are such that water in the water pipe flowing through the heat exchanger device is heated.