TWI480494B - Gas furnace and its combustion control method - Google Patents

Description

Gas furnace and combustion control method thereof

The present invention is related to a gas furnace, and more specifically to a gas furnace and a combustion control method thereof.

According to the gas stove, the gas stove is the most commonly used heating material for cooking food. Compared with the induction cooker, which converts electrical energy into heat energy, the control mode of the gas furnace is simple, and the heat energy generated by burning gas is greater than the heat energy generated by using electricity. It can effectively reduce the cooking time.

The structure of the conventional gas furnace 1 shown in Fig. 1 comprises a furnace body 10, a burner 12, a mixing tube 14 connecting the burners 12, and a nozzle 16 connected to the gas source. The furnace body 10 has an opening 102 communicating with the inside and the outside of the furnace body 10. The burner 12 is located within the furnace body 10 and has a plurality of flame holes 122 facing the opening 102. The mixing tube 14 has a plurality of air inlet holes 142. When the gas passes through the nozzle 16, air is introduced into the mixing tube 14 from the air inlet holes 142 to generate a first mixing, and then the mixing tube 14 is sent to the air around the burner 12 and the flame holes 122. Perform a second mixing and burn. The thermal energy generated by the burner 12 is related to the ratio of the amount of gas and the amount of air. When the amount of gas and the amount of air reach a preferred ratio, the thermal efficiency of the burner 12 is relatively high.

The amount of air obtained by mixing the gas of the gas furnace 1 with air Limited, so the combustion efficiency can not be improved. When the heat energy required for cooking food is high, it is only possible to provide more gas volume and increase the flame, thereby increasing the heating area of the pan to achieve the required heat energy. However, providing more gas represents more gas consumption, and today, with the growing shortage of fossil fuels, it is impossible to effectively save gas consumption. Increasing the flame is more likely to cause people to burn or ignite flammable materials near the gas stove. In addition, under the premise that the amount of air obtained is limited, increasing the gas volume alone will result in incomplete combustion of gas, which will lead to an increase in carbon monoxide. If there is no good ventilation environment, it may cause carbon monoxide poisoning. Moreover, since air is required to be collected from the flame hole 122 of the burner 12 when burning the gas, the periphery of the burner 12 must be in an open state, which causes heat energy to escape from the periphery of the burner 12, resulting in loss of heat energy. The heat generated by the combustion of gas cannot be effectively utilized.

In view of this, the main object of the present invention is to provide a gas furnace and a combustion control method thereof, which can effectively improve the thermal efficiency of the gas furnace, reduce thermal energy dissipation, and save the amount of gas.

In order to achieve the above object, the gas furnace provided by the present invention comprises a furnace body, a burner, a blower and a gas regulator. Wherein the furnace body has a first chamber and a second chamber, wherein the first chamber has an upper opening; the burner has a plurality of flame holes in the first chamber; the blower Used to introduce air to the burner; the gas regulator is arranged to be connected to One of the burners is on a gas line for regulating the flow of gas to be supplied to the burner.

According to the above concept, the present invention further provides a combustion control method for the gas furnace, comprising the following steps: A. controlling gas and air mixing in the second chamber, wherein the mixed gas volume is proportional to the air volume; Mixing gas and air into the burner and entering the first chamber from the flame holes; and C. igniting gas entering the first chamber from the flame holes.

Thereby, through the gas furnace and its combustion control method, a certain amount of air can be mixed with a certain amount of gas to enter the burner, thereby effectively improving the thermal efficiency of the combustion gas, and accumulating the heat energy generated after burning the gas, reducing Heat is dissipated, allowing heat to be used more efficiently.

In order to explain the present invention more clearly, the following examples are set forth in the accompanying drawings in detail.

2 to 7 show a gas furnace 2 according to a preferred embodiment of the present invention, which comprises a furnace body 18, a furnace frame 24, a heat insulating sheet 26, a burner 28, a mixer 30, and a heater. The blower 40 is coupled to a gas regulator 48. Wherein: the furnace body 18 has a first chamber 20 and a second chamber 22 separated from each other. In the embodiment, the furnace body 18 has a casing 182 and a partition 184. The top of the casing 182 has an upper opening 202. The partition 184 is disposed in the upper opening 202, and the partition 184 partitions the interior of the casing 182 into the first chamber 20 and the second. Room 22. The partitioning member 184 of the present embodiment has a ring wall 184a and a bottom surface 184b. The ring wall 184a surrounds the upper opening 202. The bottom surface 184b is located at the bottom edge of the ring wall 184a and is enclosed with the ring wall 184a to form the first portion. Room 20.

The hob 24 is disposed on the furnace body 18 for placing a pot body P. The bottom of the hob 24 of the embodiment is connected to the top edge of the ring wall 184a of the partition member 184, so that the hob can be cleaned when the gas stove 2 is cleaned. The housing 182 is detached together with the divider 184. The heat shield 26 surrounds the periphery of the upper opening 202 and surrounds the hob 24. The heat insulating sheet 26 has a plurality of exhaust holes 262 on its peripheral wall. When the pot body P is placed on the hob 24, the first chamber 20, the heat insulating sheet and the bottom of the pot body P form a combustion space S.

The burner 28 is disposed in the furnace body 18 and has a plurality of flame holes 282 located in the first chamber 20.

The mixer 30 is disposed in the second chamber 22, the mixer 30 includes a main body 32, and a first extension tube 36 and a second extension tube 38 connected to the main body 32. The main body 32 has a The air inlet 321 , an air outlet 322 , a first side port 323 and a second side port 324 . A main passage 325 is defined between the air inlet 321 and the air outlet 322. The first side port 323 is located between the air inlet 321 and the air outlet 322 and communicates with the main channel 325. The second side port 324 is located. The first side port 323 and the air outlet 322 are connected to each other and communicate with the main port Road 325. The first extension tube 36 and the second extension tube 38 respectively communicate with the first side port 323 and the second side port 324.

The blower 40 is disposed in the second chamber 22 and has an inlet end 402 and an outlet end 404. The outlet end 404 communicates with the inlet port 321 of the mixer 30. The blower 40 internally has a fan 46 that is controllable to vary the rotational speed and to vary the amount of wind pressure within the blower 40. The fan 46 is forced to introduce a quantity of air from the inlet end 402 during operation and enter the mixer 30 from the outlet end 404. Airflow entering a portion of the mixer 30 enters the main passage 325, and another portion of the air communicates with the first side port 323.

The gas regulator 48 is disposed in the second chamber 22. Referring to FIG. 4, the gas regulator 48 includes a control valve 50 and a regulating valve 60. Wherein: the control valve 50 includes a first valve body 52, a first valve 54 and a spring 56. The first valve body 52 has an inlet end 521 , an outlet end 522 , a passage opening 523 , a first passage 526 and a second passage 527 . The inlet end 521 is connected to a gas line 76 that communicates with the second extension tube 38 of the mixer 30. The first valve 54 is disposed in the first valve body 52, and divides the interior of the first valve body 52 into a first air chamber 524 and a second air chamber 525. The first air chamber 524 communicates with the inlet end 521. And the first air chamber 524 and the second air chamber 525 communicate with each other through the first hole 526. The second bore 527 communicates with the outlet end 522. Both ends of the spring 56 abut the first valve 54 and the inner wall of the first valve body 52, respectively. The aforementioned inlet end 521, first air chamber 524, passage opening 523 and outlet end 522 are shown in FIG. In the state, a main gas passage 58 is formed together, and the first valve 54 is in the state shown in FIG. 4, and the main gas passage 58 can be blocked. .

The regulating valve 60 includes a second valve body 62 and a second valve 64. The second valve body 62 is coupled to the first valve body 52. The second valve body 62 includes an opening 624 and a pressure relief port 625. The second valve 64 includes an elastic membrane 66 and a connecting rod 68. The elastic membrane 66 is disposed in the second valve body 62, and the elastic membrane 66 divides the second valve body 62 into a non-intersecting one. An air chamber 622 and a second air chamber 623. The first air chamber 622 communicates with the opening 624, and the opening 624 communicates with the first extension tube 36 of the mixer 30 through an air duct 72. The second air chamber 623 communicates with the second hole 527 of the first valve body 52 and the second air chamber 525 that communicates with the first valve body 52 through the pressure relief port 625. One end of the connecting rod 68 is coupled to the elastic film 66, and the other end passes through the pressure releasing port 625. The connecting rod 68 can be driven by the elastic film 66 in a first position P1 shown in FIG. 5 and shown in FIG. One of the second positions P2 reciprocates to close or open the pressure relief port 625. The pressure relief port 625, the second air chamber 623 and the second channel 527 on the first valve body 52 together form a pressure relief passage 70 as shown in FIG. 6, and the second valve 64 is located in the pressure relief passage. On the path of 70.

When the blower 40 is not in operation, the link 68 of the second valve 64 is located at the first position P1, and the link 68 closes the pressure relief port 625 (refer to FIG. 5), that is, blocks the pressure relief passage 70. At this time, the first air chamber 524 of the control valve 50 is equal to the air pressure of the second air chamber 525, and the first valve 54 is The spring 56 pushes against the passage opening 523 to block the main gas passage 58.

Referring to FIG. 6 and FIG. 7, when the blower 40 is in operation, the wind pressure generated by the blower 40 is poured into the first air chamber 622 of the regulating valve 60 by the mixer 30 to form a force F to the elastic film 66. Pushing the connecting rod 68 toward the second air chamber 623, and pushing the connecting rod 68 to the second position P2, so that a gap D is generated between the connecting rod 68 and the pressure releasing port 625 (Fig. 7)), the pressure relief passage 70 is opened. At this time, the gas of the second air chamber 525 flows from the pressure release passage 70 to the outlet end 522 of the first valve body 52, so that the air pressure of the second air chamber 525 of the control valve 50 is lowered, and the second air chamber 525 is relatively lower than the air pressure of the first plenum 524, thus creating a pressure differential. When the pressure difference is greater than the force of the spring 56 pushing against the first valve 54, the first valve 54 is pushed to the second air chamber 525, opening the main gas passage 58 so that the gas passes through the gas regulator 48. And entering the mixer 30 for mixing with air from a portion of the blower 40.

As can be seen from the above, the degree of opening of the first valve 54 can be indirectly controlled by controlling the rotational speed of the blower 40 fan 46 to generate different wind pressures, thereby adjusting the flow rate of gas supplied to the mixer 30.

The manipulation device 74 includes an operation interface exemplified by a knob 742, and a controller 744. The knob 742 is used by the user to adjust the rotation speed of the fan 46. The controller 744 is electrically connected to the blower 40 and is rotated according to the knob 742. The amplitude sends a corresponding voltage to the blower 40, thereby controlling the rotational speed of the fan 46. Thereby, the user can control the firepower of the burner 28 by adjusting the knob 742.

In the above, the gas and the air are mixed first in the second chamber 22 before entering the burner 28. Therefore, the burner 28 does not need to obtain air from the flame holes 282 when burning the gas. Therefore, the flame hole 282 of the burner 28 can be located in the first chamber 20 of the furnace body 18. The gas entering the first chamber 20 from the flame holes 282 is ignited by an igniter (not shown) to generate thermal energy, and the generated heat energy can be accumulated in the first chamber 20, and the heat energy is transmitted through the upper opening. 202 is delivered to the pot P. It is more worth mentioning that when the pot body P is placed on the hob 24, the combustion space S formed by the first chamber 20, the heat insulating sheet 26 and the bottom of the pot body P can concentrate heat energy. Avoid heat dissipation. The pressure generated in the combustion space S after the combustion of the gas can release the pressure through the exhaust holes 262, and the burned moisture and carbon dioxide are also discharged from the exhaust hole 262.

In practice, the top edge of the heat insulating sheet 26 may be lower than the top edge of the furnace frame 24, so that there is a gap between the bottom of the pot body P and the heat insulating sheet 26, and the size of the visible gap is set according to requirements. The venting holes 262 do not need to be provided if the size of the slits is sufficient to release the pressure. Further, if the heat insulating sheet having a good supporting force is used to support the pot body P, the hob 24 may not be provided.

Another specific embodiment that achieves the same effects described above is further provided below, wherein: 8 and FIG. 9 is a gas furnace 3 according to a second preferred embodiment of the present invention, having a furnace body 18, a furnace frame 24, a heat insulating sheet 26, and a burner 28 which are identical to the above-described first preferred embodiment. The blower 40, and a mixer 80, a gas regulator 86 and a handling device 88, which are different from the above embodiments.

In the present embodiment, the mixer 80 includes a main body 82 and an extension tube 84. The main body 82 has an air inlet 822, a side port 824 and an air outlet 826 communicating with each other. A main passage 828 is formed between the air inlet 822 and the air outlet 826. The side port 824 is located between the air inlet 822 and the air outlet 826, and the extension tube 84 communicates with the side port 824. The air outlet 826 communicates with the burner 28.

The gas regulator 86 is disposed in communication with a gas line 90 of the mixer 80 for regulating a flow of gas to the mixer 80. In this embodiment, the gas regulator 86 is exemplified by a proportional valve, but is not limited thereto. The proportional valve utilizes the supplied current to cause the valve to be proportionally opened, that is, when the current supply is larger, the valve opening degree is proportionally increased, and the supplied gas flow rate is proportionally increased, of course, in design, Other mechanisms can also be used, such as the stepper motor to control the degree of valve opening, it is important to control and calculate the flow of gas through. The gas regulator 86 has an inlet end 862 that communicates with the gas line 90 and an outlet end 864 that communicates with the extension tube 84 of the mixer 80. The gas injected from the side port 824 of the mixer 80 enters the main passage 828; the air injected by the air inlet 822 pulls and mixes the gas around the side port 824 toward the air outlet 826, and outputs To the burner 28.

The operating device 88 includes an operating interface exemplified by a knob 882 and an electronic control unit 884. The electric control unit 884 is electrically connected to the knob 882, the blower 40 and the gas regulator 86, respectively. The knob 882 is used by the user to adjust the firepower of the burner 28. The electronic control unit 884 sends a corresponding current to the gas regulator 86 according to the rotation amplitude of the knob 882, and the corresponding voltage is applied to the blower 40. The gas flow to the mixer 80 is controlled and the fan 46 is driven to introduce air. When the rotation amplitude of the knob 882 is larger, the amount of air and the amount of gas delivered to the mixer 80 are also relatively increased, whereby the user can adjust the amount of firepower of the burner 28 by adjusting the knob 882.

In this embodiment, by separately controlling the gas regulator 86 and the blower 40, a certain amount of gas and a certain amount of air can be mixed before entering the burner 28, and after the gas is ignited, the gas is burned. The space S burns to make the heat more concentrated.

The gas furnace of the invention premixes gas and air to improve gas combustion efficiency, and reuses the heat energy generated by the first chamber of the furnace to accumulate the heat energy generated by the gas, so that the heat energy generated by the gas can be more effectively utilized, thereby achieving the purpose of saving gas. In addition, in addition to avoiding thermal energy dissipation, the heat shield can prevent flames from escaping, causing burns or igniting flammable materials near the gas stove.

The above description is only a preferred embodiment of the present invention, and is not all embodiments of the present invention. Where the application of the invention and the scope of the patent application are applied Changes in equivalent structures and equivalent methods are intended to be included in the scope of the invention.

1‧‧‧ gas stove

10‧‧‧ furnace body

102‧‧‧ openings

12‧‧‧ burner

122‧‧‧flaming hole

14‧‧‧Mixed tube

142‧‧‧Inlet

16‧‧‧ nozzle

2‧‧‧ gas stove

18‧‧‧ furnace body

182‧‧‧Chassis

184‧‧‧Parts

184a‧‧‧Circle

184b‧‧‧ bottom

20‧‧‧First room

202‧‧‧Top opening

22‧‧‧Second room

24‧‧‧Hole

26‧‧‧insulation film

262‧‧‧ venting holes

28‧‧‧ Burner

282‧‧‧flaming hole

30‧‧‧Mixer

32‧‧‧ Subject

321‧‧‧ inlet

322‧‧‧ air outlet

323‧‧‧ first side port

324‧‧‧Second side

325‧‧‧ main channel

36‧‧‧First extension tube

38‧‧‧Second extension tube

40‧‧‧Blowers

402‧‧‧ entrance end

404‧‧‧export end

46‧‧‧fan

48‧‧‧ Gas Regulator

50‧‧‧Control valve

52‧‧‧First valve body

521‧‧‧ entrance end

522‧‧‧export end

523‧‧‧ passage

524‧‧‧First air chamber

525‧‧‧Second chamber

526‧‧‧ first tunnel

527‧‧‧Second hole

54‧‧‧First valve

56‧‧‧ Spring

58‧‧‧Main Gas Passage

60‧‧‧Regulator

62‧‧‧Second body

622‧‧‧First air chamber

623‧‧‧Second chamber

624‧‧‧ openings

625‧‧ ‧pressure relief

64‧‧‧Second valve

66‧‧‧elastic film

68‧‧‧ Connecting rod

70‧‧‧Relief path

72‧‧‧air duct

74‧‧‧Control device

742‧‧‧ knob

744‧‧‧ Controller

76‧‧‧ gas pipeline

3‧‧‧ gas stove

80‧‧‧ Mixer

82‧‧‧ Subject

822‧‧‧air inlet

824‧‧‧ side port

826‧‧‧ outlet

828‧‧‧ main channel

84‧‧‧Extension tube

86‧‧‧ gas regulator

862‧‧‧ entrance end

864‧‧‧export end

88‧‧‧Control device

882‧‧‧ knob

884‧‧‧Electric control unit

90‧‧‧ gas pipeline

D‧‧‧ gap

F‧‧‧force

P‧‧‧ pot body

S‧‧‧ burning space

P1‧‧‧ first position

P2‧‧‧ second position

1 is a schematic view of a conventional gas furnace; FIG. 2 is a schematic view of a gas furnace according to a first preferred embodiment of the present invention; FIG. 3 is a schematic view of a mixer according to a first preferred embodiment of the present invention; FIG. 5 is a partial enlarged view of FIG. 4, illustrating a pressure relief passage block; FIG. 6 is a schematic view showing the opening of a gas damper of a gas regulator according to a first preferred embodiment of the present invention; FIG. FIG. 8 is a schematic view of a gas furnace according to a second preferred embodiment of the present invention; and FIG. 9 is a schematic view of a mixer according to a second preferred embodiment of the present invention.

2‧‧‧ gas stove

18‧‧‧ furnace body

182‧‧‧Chassis

184‧‧‧Parts

184a‧‧‧Circle

184b‧‧‧ bottom

20‧‧‧First room

202‧‧‧Top opening

22‧‧‧Second room

24‧‧‧Hole

26‧‧‧insulation film

262‧‧‧ venting holes

28‧‧‧ Burner

282‧‧‧flaming hole

30‧‧‧Mixer

321‧‧‧ inlet

322‧‧‧ air outlet

36‧‧‧First extension tube

38‧‧‧Second extension tube

40‧‧‧Blowers

402‧‧‧ entrance end

404‧‧‧export end

46‧‧‧fan

48‧‧‧ Gas Regulator

50‧‧‧Control valve

521‧‧‧ entrance end

522‧‧‧export end

60‧‧‧Regulator

72‧‧‧air duct

74‧‧‧Control device

742‧‧‧ knob

744‧‧‧ Controller

76‧‧‧ gas pipeline

P‧‧‧ pot body

S‧‧‧ burning space

Claims (8)

A gas burner comprises: a furnace body having a first chamber and a second chamber separated by a first chamber, wherein the first chamber has an upper opening; and a burner having a plurality of flame holes at the first a chamber; a blower for introducing air to the burner; a gas regulator disposed to communicate with a gas line of the burner for regulating gas flow to the burner; a mixer, located in the second chamber, the mixer having a main passage, a first side port and a second side port, the main passage communicating with the burner and the blower, the second side port communicating with the main a passage, a portion of the airflow generated by the blower enters the main passage, and another portion of the airflow communicates with the first side port, the gas regulator communicates with the first side port, and the gas regulator is wind pressure generated by the blower The gas flow for delivery to the mixer is adjusted, and the gas flowing through the gas regulator enters the main passage from the second side port. The gas burner of claim 1, wherein the gas regulator comprises a regulating valve and a control valve, the regulating valve having an opening communicating with the first side port, the control valve having an inlet end communicating with the gas line and An outlet end communicates with the second side port, and the regulating valve is driven by the wind pressure generated by the blower to control the control valve to adjust the gas flow rate to be supplied to the mixer. The gas furnace of claim 1 includes a control device electrically connected to the blower for controlling the rotational speed of the fan. A gas burner comprises: a furnace body having a first chamber and a second chamber separated by a first chamber, wherein the first chamber has an upper opening; and a burner having a plurality of flame holes at the first a chamber in which a blower is introduced to introduce air to the burner; a gas regulator is disposed in a gas line connected to the burner for regulating the flow of gas to be supplied to the burner; The furnace body has a casing and a partition, the top of the casing has the upper opening, the partition is disposed in the upper opening, and the partition separates the interior of the casing into the first chamber And the second chamber, the partition member has a ring wall and a bottom surface, the ring wall surrounds the upper opening, the bottom surface is located at a bottom edge of the ring wall, and is coextensively formed with the ring wall to form the first chamber; a heat insulating sheet disposed on the surface of the casing and surrounding the upper opening; a hob disposed on the casing, and a bottom of the hob connecting the annular wall of the partition, the heat insulating sheet surrounding the hob . A gas burner comprises: a furnace body having a first chamber and a second chamber separated by a first chamber, wherein the first chamber has an upper opening; and a burner having a plurality of flame holes at the first a chamber; a blower for introducing air to the burner; a gas regulator disposed to be connected to a gas line of the burner for regulating a flow of gas to be supplied to the burner; Wherein, the furnace body has a casing and a partition, the top of the casing has the upper opening, the partition is disposed in the upper opening, and the partition separates the interior of the casing into the first capacity The chamber and the second chamber, the partition member has a ring wall and a bottom surface, the ring wall surrounds the upper opening, the bottom surface is located at the bottom edge of the ring wall, and is coextensively formed with the ring wall to form the first chamber; a heat insulating sheet disposed on the surface of the casing and surrounding the upper opening, the top edge of the heat insulating sheet being lower than the top edge of the furnace rack; a furnace rack disposed on the casing, the heat insulating sheet Around the hob. The gas burner of claim 5, wherein the heat insulating sheet has a plurality of vent holes. A gas burner comprises: a furnace body having a first chamber and a second chamber separated by a first chamber, wherein the first chamber has an upper opening; and a burner having a plurality of flame holes at the first a chamber in which a blower is introduced to introduce air to the burner; a gas regulator is disposed in a gas line connected to the burner for regulating the flow of gas to be supplied to the burner; The furnace body has a casing and a partition, the top of the casing has the upper opening, the partition is disposed in the upper opening, and the partition separates the interior of the casing into the first chamber And the second chamber, the partition member has a ring wall and a bottom surface, the ring wall surrounds the upper opening, the bottom surface is located at the bottom edge of the ring wall, and is coextensively formed with the ring wall to form the first chamber; A heat insulating sheet is disposed on the surface of the casing and surrounds the upper opening, wherein the heat insulating sheet has a plurality of vent holes. A combustion control method for a gas furnace according to claim 1, comprising the steps of: A. controlling mixing of gas and air in the second chamber, wherein the amount of mixed gas is proportional to the amount of air; The mixed gas and air are introduced into the burner and enter the first chamber from the flame holes; and C. ignite the gas entering the first chamber from the flame holes; wherein the gas furnace a mixer is disposed in the second chamber, the mixer has a main passage communicating with each other, a first side port and a second side port; the blower has a fan inside; the gas regulator includes a regulating valve And a control valve; the main passage is connected to the burner and the blower, the first side port is connected to the regulating valve, and the second side port is connected to the control valve; wherein the step A comprises the following steps: controlling the fan to operate, Providing a quantity of air to the mixer; injecting air supplied to a portion of the mixer into the first side port to control the regulating valve to cause the control valve to regulate a flow of gas to the mixer; Another portion of the air supplied to the gas mixer and the mixer for mixing the output to the main channel.