TWI486540B - Direct pressure water heater and its control method - Google Patents

Description

Direct pressure water heater and control method thereof

The invention relates to a gas water heater, and more particularly to a direct pressure water heater and a control method therefor.

When the heating device of the conventional water heater burns gas, the air enters the heating device in a natural convection manner to mix and burn with the gas, thereby heating the water inside the water pipe. The thermal energy generated by the heating device 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 heating device is relatively high. However, the amount of air provided by natural convection is limited, so the thermal efficiency of conventional water heaters is relatively low. Today, with the growing shortage of fossil fuels, it is impossible to effectively save gas consumption. Based on this, some companies have developed a type of powerful water heater, which uses a blower to force a certain amount of air into the heating device to mix with the gas to increase the thermal efficiency. However, the conventional storm-type water heaters must individually control the gas regulator and the blower, so that the amount of gas supplied to the heating device is proportional to the amount of air, and the control method is relatively complicated, and the production cost is relatively high. Furthermore, when the blower is slowed down due to aging, the amount of air entering the heating device will be relatively reduced, resulting in incomplete combustion of gas. If the control method of the powerful water heater can be simplified, and the effect of effectively mixing the air with the gas can still be achieved, the production cost can be reduced, and the amount of gas can be saved.

In view of this, the main object of the present invention is to provide a direct pressure water heater and a control method thereof, which can supply gas and air required for combustion in a simple manner, and save the amount of gas.

Another object of the present invention is to provide a direct pressure water heater and a control method thereof, which utilize mechanical linkage to reduce the control error of the amount of gas and the amount of air required for combustion.

In order to achieve the above object, the direct pressure water heater provided by the present invention comprises a heating device, a blower and a gas regulator. Wherein, the heating device is used for burning gas to heat water in a water pipe; the blower is internally provided with a fan for forcibly introducing air to the heating device, the fan is controlled to change the rotation speed, and the inside of the air blower is changed. The gas pressure regulator is disposed on a gas line connected to the heating device, and the gas regulator adjusts the gas flow rate to be supplied to the heating device according to the wind pressure inside the air blower.

According to the above concept, the present invention further provides a control method for the direct pressure water heater, comprising the steps of: starting the fan operation to provide a predetermined amount of air to the heating device, and providing a predetermined wind pressure to the gas. The regulator causes the gas regulator to supply a predetermined gas flow to the heating device; controlling the rotation speed of the fan to supply the gas regulator to a gas flow corresponding to the rotation speed of the fan to the heating device.

Thereby, through the direct pressure water heater and the control method thereof, it is only necessary to control the rotation speed of the fan of the air blower to achieve the effect of simultaneously mixing the air and the gas into the heating device, thereby effectively simplifying the control mode.

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

1 to 6 show a direct pressure water heater according to a preferred embodiment of the present invention, which comprises a heating device 10, a blower 16, a gas regulator 26 and a controller 54. Wherein: the heating device 10 comprises a burner 12 and a heat exchanger 14 which burns gas to generate thermal energy and is supplied to the heat exchanger 14 to heat the water in a water pipe 60.

The blower 16 includes a housing 18 and a fan 20. The housing 18 includes an inlet end 182 and an outlet end 184 that communicates with the burner 12. The fan 20 is disposed within the housing 18. The fan 20 is forced to introduce air from the inlet end 182 during operation, and the introduced air enters the burner 12 from the outlet end 184. The airflow generated when the fan 20 rotates forms a wind pressure inside the blower 16, and the fan 20 is controlled to change the rotational speed and change the wind pressure inside the blower 16. In addition, in order to extract the airflow inside the blower 16, the housing 18 is further provided with a first opening 186, and the first opening 186 is connected with an air duct 21, and the airflow inside the blower 16 enters the guide. Duct 21 In the embodiment, the air duct 21 has a wind guide 22 and a tube body 24. The air guiding member 22 is tubular and disposed at one end of the tubular body 24, and the air guiding member 22 passes through the first opening 186. One end of the air guiding member 22 has a collecting port 222 which is located inside the casing 18 and is opposite to the direction of the airflow inside the air blower 16, thereby introducing the airflow inside the casing 18 into the pipe body 24. .

The gas regulator 26 is disposed in communication with a gas line 62 of the burner 12. Referring to FIG. 3, in the present embodiment, the gas regulator 26 includes a control valve 28 and a regulating valve 42. Wherein: the control valve 28 includes a first valve body 30 and a first valve 32. The first valve body 30 has an inlet end 301, an outlet end 302, a passage opening 303, a plenum 304, a first passage 305 and a second passage 306. The inlet end 301 and the outlet end 302 are respectively connected to the gas line 62. The first valve 32 includes an elastic membrane 34, a valve plug 36 and a spring 38. The elastic membrane 34 is disposed inside the first valve body 30, and divides the air chamber 304 into a first air chamber 304a and a second air chamber 304b. The first air chamber 304a communicates with the inlet end 301, and the first The gas chamber 304a and the second gas chamber 304b communicate with each other through the first tunnel 305. The second tunnel 306 is in communication with the outlet end 302. The valve plug 36 is disposed on the elastic membrane 34. The two ends of the spring 38 abut against the valve plug 36 and the inside of the first valve body 30, respectively. The inlet end 301, the first plenum 304a, the passage 303 and the outlet end 302 together form a main gas passage 40 in the state shown in FIG. Thereby the first valve A door 32 is located on the path of the main gas passage 40 for blocking or opening the main gas passage 40.

The regulating valve 42 includes a second valve body 44 and a second valve 46. The second valve body 44 is coupled to the first valve body 30 of the control valve 28. The second valve body 44 includes a chamber 442, a second opening 444 communicating with the chamber 442, and an air inlet 446. An air outlet 448. One end of the second opening 444 communicates with the first opening 186 of the blower 16 through the tubular body 24 of the air duct 21 and the air guiding member 22. The second valve 46 includes an elastic membrane 48 and a link 50. The elastic film 48 is coupled to the inside of the second valve body 44, and closes the other end of the second opening 444, and divides the chamber 442 into a first chamber 442a and a second chamber 442b. The first chamber The second opening 444 is communicated with the second opening 444, and the second chamber 442b communicates with the air inlet 446 and the air outlet 448. The air inlet 446 communicates with the second air chamber 304b of the first valve body 30, and the air outlet 448 communicates with the second tunnel 306 of the first valve body 30. One end of the connecting rod 50 is coupled to the elastic film 48, and the other end passes through the air inlet 446. The connecting rod 50 can be driven by the elastic film 48 at a first position P1 shown in FIG. 4 and FIG. A second position P2 is reciprocated to close or open the air inlet 446. The air inlet 446, the second chamber 442b, the air outlet 448 and the second tunnel 306 on the first valve body 30 together form a pressure relief passage 52 as shown in FIG. 5, and the second valve 46 is located The pressure relief passage 52 is on the path.

When the blower 16 is not in operation, the connecting rod 50 of the second valve 46 Located in the first position P1, the connecting rod 50 closes the air inlet 446 (refer to FIG. 4), that is, blocks the pressure relief passage 52, and at this time, the first air chamber 304a and the second air chamber 304b of the control valve 28. The air pressure is equal, and the valve plug 36 is pushed against the spring 38 to contact the passage opening 303 to block the main gas passage 40.

Referring to FIG. 5 and FIG. 6, when the blower 16 is in operation, the wind pressure generated by the blower 16 is poured into the first chamber 442a, and the elastic film 48 is pushed toward the second chamber 442b. The elastic film 48 is pushed by the wind pressure inside the air blower 16 to push the connecting rod 50 to the second position P2, so that a gap D is generated between the connecting rod 50 and the air inlet 446, and the pressure is released. Path 52. At this time, the gas of the second air chamber 304b flows from the pressure release passage 52 to the outlet end 302 of the first valve body 30, so that the air pressure of the second air chamber 304b of the control valve 28 is lowered, and the second air chamber 304b The air pressure is lower than the first air chamber 304a, thereby forming a pressure difference. When the pressure difference is greater than the force of the spring 38 pushing against the valve plug 36, the elastic film 34 is pushed to the second air chamber 304b. The main gas passage 40 is opened.

According to the above description, the degree of opening of the first valve 32 can be indirectly controlled by controlling the rotational speed of the fan 20 of the blower 16 to generate different wind pressures, thereby adjusting the flow rate of gas supplied to the burner 12.

The controller 54 is electrically connected to the blower 16 and controls the starting and rotating speed of the fan 20 of the blower 16 to provide a certain amount of gas and a certain amount of air of the burner 12.

The amount of air supplied to the burner 12 by the blower 16 and the gas tone The amount of gas supplied to the burner 12 by the throttle 26 has a linked relationship. Therefore, it is only necessary to control the fan 20 of the blower 16 to increase the rotational speed, so that the amount of gas supplied to the burner 12 is increased simultaneously with the amount of air. , to achieve a higher calorific value. On the contrary, the rotation speed of the fan 20 of the blower 16 is lowered, and the amount of gas supplied to the burner 12 is simultaneously reduced with the amount of air, so that the heat value can be lowered.

Thereby, the control of the direct pressure water heater is performed by the above-described structural design by the above-described control method. The control method includes the following steps: The fan 20 that activates the blower 16 operates to provide the blower 16 with a predetermined amount of air to be supplied to the heating device 10 from the outlet end 184 of the blower 16. The airflow generated within the blower 16 forms a predetermined wind pressure to the regulating valve 42 to open the main gas passage 40 in the control valve 28 for delivering a predetermined gas flow to the heating device 10.

The controller 54 controls the rotational speed of the blower 16 fan 20 such that the gas regulator 26 supplies a gas flow rate corresponding to the rotational speed of the fan 20 to the heating device 10.

Thereby, the gas flow rate can be indirectly controlled by controlling the rotation speed of the blower 16, and a certain amount of gas and air can enter the burner 12 to be burned.

Through the direct pressure water heater and the control method thereof provided by the invention, it is only necessary to separately control the rotation speed of the blower fan to achieve the effect of simultaneously supplying a certain amount of air and a certain amount of gas to the combustor for combustion, without individual control. The gas flow rate of the gas regulator and the rotation speed of the blower effectively simplify the control method, thereby reducing the manufacturing cost, and compared with the conventional natural convection water heater. Can save gas consumption. Furthermore, when the blower is slowed down due to aging, the amount of gas supplied to the burner will decrease with the amount of air, and the gas can still be completely burned.

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

10‧‧‧ heating device

12‧‧‧ burner

14‧‧‧ heat exchanger

16‧‧‧Blowers

18‧‧‧Shell

182‧‧‧ entrance end

184‧‧‧export end

186‧‧‧ first opening

20‧‧‧Fan

21‧‧‧air duct

22‧‧‧Guidement

222‧‧ ‧ vents

24‧‧‧ tube body

26‧‧‧ Gas Regulator

28‧‧‧Control valve

30‧‧‧First valve body

301‧‧‧ entrance end

302‧‧‧export end

303‧‧‧ passage

304‧‧‧ air chamber

304a‧‧‧First air chamber

304b‧‧‧Second chamber

305‧‧‧ first tunnel

306‧‧‧Second tunnel

32‧‧‧First valve

34‧‧‧elastic film

36‧‧‧ Valve plug

38‧‧‧ Spring

40‧‧‧Main Gas Passage

42‧‧‧Regulator

44‧‧‧Second body

442‧‧ ‧ room

442a‧‧‧First Room

442b‧‧‧Second room

444‧‧‧second opening

446‧‧‧ inlet

448‧‧‧ air outlet

46‧‧‧Second valve

48‧‧‧elastic film

50‧‧‧ linkage

52‧‧‧Relief passage

54‧‧‧ Controller

60‧‧‧Water pipes

62‧‧‧ gas pipeline

D‧‧‧ gap

P1‧‧‧ first position

P2‧‧‧ second position

1 is a schematic view of a direct-pressure water heater according to a preferred embodiment of the present invention; FIG. 2 is a schematic structural view of a blower according to a preferred embodiment of the present invention; FIG. 3 is a schematic view of a gas regulator according to a preferred embodiment of the present invention; FIG. 5 is a schematic view showing the opening of the main gas passage of the gas regulator according to the preferred embodiment of the present invention; and FIG. 6 is a partial enlarged view of FIG. 5, showing the opening of the pressure relief passage.

10‧‧‧ heating device

12‧‧‧ burner

14‧‧‧ heat exchanger

16‧‧‧Blowers

182‧‧‧ entrance end

184‧‧‧export end

21‧‧‧air duct

22‧‧‧Guidement

24‧‧‧ tube body

26‧‧‧ Gas Regulator

28‧‧‧Control valve

42‧‧‧Regulator

54‧‧‧ Controller

60‧‧‧Water pipes

62‧‧‧ gas pipeline

Claims (8)

A direct pressure water heater includes: a heating device for burning gas to heat water in a water pipe; a blower having a fan inside for forcibly introducing air to the heating device, the fan being controlled And changing the rotation speed and changing the wind pressure inside the air blower; and a gas regulator is disposed on the gas pipeline connected to the heating device, the gas regulator is adjusted according to the wind pressure inside the air blower. a gas flow rate to the heating device; wherein the air blower has a first opening; the gas regulator has a second opening; an air guiding pipe communicates with the first opening and the second opening, and the airflow inside the air blower is transmitted through The air duct enters the gas regulator. The direct pressure water heater of claim 1, wherein the air blower has a casing, the casing has the first opening; the air duct has a wind guiding member and a pipe body, and the air guiding member is disposed on the One end of the pipe body, and the air guiding member has a gas collecting opening inside the casing for introducing the airflow inside the casing into the pipe body, and the other end of the pipe body communicates with the second opening of the gas conditioner. The direct pressure water heater of claim 1, wherein the gas regulator comprises a control valve and a regulating valve, wherein: the control valve comprises a first valve body and a first valve, the first valve body has a a main gas passage is in communication with the gas line, the first valve is located on the path of the main gas passage; The regulating valve includes a second valve body and a second valve, the second opening is located on the second valve body, and a pressure relief passage is formed between the first valve body and the second valve body, the second valve is located The second valve is reciprocated between a first position and a second position by the wind pressure inside the blower. In the first position, the second valve blocks The pressure relief passage causes the first valve to block the main gas passage. In the second position, the second valve opens the pressure relief passage, so that the first valve opens the main gas passage, and the first valve The degree of opening is proportional to the wind pressure inside the blower. The direct pressure water heater of claim 3, wherein the first valve body has a first air chamber and a second air chamber, and the first valve is located between the first air chamber and the second air chamber. The second air chamber communicates with the pressure relief passage; when the second valve is in the first position, the air pressure of the first air chamber is equal to the air pressure of the second air chamber, and the first valve blocks the main gas passage When the second valve is in the second position, the air pressure of the second air chamber is smaller than the air pressure of the first air chamber, and the first valve opens the main gas passage. The direct pressure water heater of claim 1 includes a controller electrically connected to the blower for controlling the speed of the fan of the blower. A direct pressure water heater control method, the direct pressure water heater comprises a heating device and a blower and a gas regulator connected to the heating device, the blower is connected to the gas regulator, and the fan is internally provided with a fan, the control The method comprises the steps of: initiating operation of the fan to provide a predetermined amount of air to the heating device, and providing a predetermined wind pressure to the gas regulator to supply the gas regulator The predetermined gas flow is supplied to the heating device; the rotation speed of the fan is controlled such that the gas regulator supplies a gas flow rate corresponding to the rotation speed of the fan to the heating device. The control method of the direct pressure water heater according to claim 6, wherein the gas flow rate supplied by the gas regulator to the heating device is proportional to the rotation speed of the fan. The control method of the direct pressure water heater according to claim 6, wherein the gas regulator comprises a regulating valve and a control valve, the regulating valve is connected to the air blower, and the regulating valve is driven by the wind pressure to control the control valve to be adjusted. The gas flow rate to the heating device.