A high-power heater with high safety performance

Abstract

The present invention discloses a high-power warm air blower with high safety performance, belonging to the technical field of warm air blowers. It includes a chassis, in which a burner, a blower, a air supply fan, a hot air channel, and a wind wheel box are provided. On the outer wall of the chassis, there are an electrical control box, a fuel pressure regulating box, and an air outlet. The electrical control box is equipped with a control system. There is a pipeline opening Ⅰ on the outer wall of the fuel pressure regulating box, and a pipeline opening Ⅱ on the chassis. One end of the air supply pipeline is connected to the gas source, and the other end is connected to the gas channel on the burner. The air outlet of the blower is respectively connected to the air inlet for air / gas premixing on the gas channel and the combustion chamber air inlet of the burner. The hot air outlet of the burner is connected to the hot air inlet of the wind wheel box through the hot air channel, and the hot air outlet of the wind wheel box is communicated with the air outlet. In the present invention, the warm air is discharged in a negative pressure manner. The air supply fan and the wind wheel in the wind wheel box act together to make the inside of the wind wheel box in a negative pressure environment, so that no open fire will be generated at the air outlet of the chassis, and the safety performance is high.

Description

Technical Field

[0001] The present invention belongs to the technical field of heaters, and particularly relates to a high-power heater with high safety performance. Background Art

[0002] High-power heaters mainly refer to heaters with relatively large power used in industrial fields, mainly for some industrial places with large spaces such as workshops and factories. As the name implies, high-power heaters, like industrial heaters, heat the air. There are various current heating methods: floor heating, radiation, hot air, convection, etc. There are also many choices of energy sources, traditional coal, gas, common electric heating, and currently emerging oil and gas heating. Among various heating methods, air heating is relatively comfortable. High-power heaters are required to provide clean and dry air, heat the entire space, and have uniform temperature. They have the advantages of rapid heating and fast heat circulation. Currently, high-power heaters have problems of complex structure and low safety performance. Summary of the Invention

[0003] The purpose of the present invention is to provide a high-power heater with high safety performance, which has the advantages of simple structure and large heat emission.

[0004] To achieve the above purpose, the present invention adopts the following technical solutions: A high-power heater with high safety performance includes a chassis with a hollow chamber. Inside the chassis, there are a burner, a blower, a air supply fan, a hot air channel, and a wind wheel box. A wind wheel is arranged inside the wind wheel box, and the wind wheel is connected to the air supply fan through a belt. An electrical control box, a fuel pressure regulating box, and an air outlet are arranged on the outer wall of the chassis. A control system is installed inside the electrical control box. A pipe through hole Ⅰ for the air supply pipe to pass through is arranged on the outer wall of the fuel pressure regulating box, and a pipe through hole Ⅱ for the air supply pipe to pass through is arranged on the chassis. One end of the air supply pipe is connected to the gas source, and the other end sequentially passes through the pipe through hole Ⅰ, the pipe through hole Ⅱ and is connected to the gas channel on the burner. The air outlet of the blower is respectively connected to the air inlet for air / gas premixing on the gas channel and the combustion chamber air inlet of the burner.

[0005] Preferably, the air supply pipe includes an air supply main pipe, a main air supply pipe, and an auxiliary air supply pipe. The intake end of the air supply main pipe is connected to the gas source. The outlet end of the air supply main pipe is respectively connected to the intake ends of the main air supply pipe and the auxiliary air supply pipe through a three-way valve. A large-flow inlet and a small-flow inlet are arranged on the gas channel. The outlet end of the main air supply pipe is connected to the large-flow inlet on the burner, and a solenoid valve Ⅱ is arranged at the connection between the main air supply pipe and the large-flow inlet. The outlet end of the auxiliary air supply pipe is connected to the small-flow inlet on the burner, and a solenoid valve Ⅰ is arranged at the connection between the auxiliary air supply pipe and the small-flow inlet.

[0006] Preferably, the control system includes a controller, a power switch, a blower pressure switch, a forced draft fan negative pressure switch, solenoid valve I, solenoid valve II, an igniter, a flame detector for detecting the flame of the burner, and a power supply for supplying power to the electrical components in the electrical control box. The signal output ends of the blower pressure switch and the forced draft fan negative pressure switch are connected to the signal input end of the controller, and the signal output of the controller is connected to solenoid valve I, solenoid valve II, and the igniter.

[0007] Preferably, an air supply opening is provided at one end of the hot air passage close to the air wheel box.

[0008] Preferably, a louver for allowing external air to enter the chassis is provided on the chassis, and the louver is arranged on the side opposite to the electrical control box.

[0009] Preferably, the rotating shaft of the air wheel extends out of the chassis and is connected to pulley I, the rotating shaft of the forced draft fan extends out of the chassis and is connected to pulley II, pulley I and pulley II are connected by a belt, and a belt cover is provided on the chassis.

[0010] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0011] 1. The present invention adopts the method of exhausting warm air under negative pressure, and there will be no open flame at the air outlet of the chassis, so the safety performance is high.

[0012] 2. By setting the blower pressure switch and the forced draft fan negative pressure switch in the present invention, only when it is ensured that the blower and the forced draft fan are working properly, the control system will control the burner to work and the igniter to ignite, avoiding the phenomenon that when the forced draft fan or the blower is not working properly, the igniter ignites and the burner works, resulting in the failure to discharge hot air in time.

[0013] 3. The present invention adopts a two-stage combustion method. During the first-stage combustion, solenoid valve I is controlled to open, and the gas supply is supplied in a small flow rate. When the flame detector detects that the first-stage fire is burning normally, the controller controls solenoid valve II to open, and the gas supply is changed to a large flow rate supply, entering the second-stage combustion, that is, the warm air blower enters the normal working state. By adopting the two-stage combustion method, it solves the problems of waste of gas source caused by the failure of the igniter to ignite normally or the failure of ignition, and the potential safety hazards caused by a large amount of gas leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is a schematic structural diagram of the present invention;

[0015] Figure 2 is a schematic connection diagram of the blower, burner, hot air passage, air wheel box, and forced draft fan in the present invention;

[0016] Figure 3 is a schematic structural diagram of the present invention without the left side wall;

[0017] Figure 4 Schematic diagram of the connection structure of the burner, gas passage, and air passage in the present invention;;

[0018] Figure 5 Schematic diagram of the structure of the hot air passage in the present invention;

[0019] Figure 6 Block diagram of the control principle of the control system in the present invention;

[0020] In the figure: chassis 100, air outlet 101, pipe opening II - 102, shutter 103, burner 200, gas passage 201, large - flow inlet 202, small - flow inlet 203, air inlet for pre - mixing air and gas 204, auxiliary air passage 205, blower 300, air supply fan 400, hot air passage 500, air make - up port 501, wind wheel box 600, belt cover 700, electrical control box 800, fuel pressure regulator box 900, pipe opening I - 901. Specific embodiments

[0021] To enable those skilled in the art to better understand the present invention, the following further describes the present invention in conjunction with specific embodiments:

[0022] As Figure 1-6 shown, a high - power warm air blower with high safety performance includes a chassis 100 with a hollow chamber. Inside the chassis 100, there are a burner 200, a blower 300, an air supply fan 400, a hot air passage 500, and a wind wheel box 600. Inside the wind wheel box 600, there is a wind wheel, and the rotating shaft of the wind wheel extends out of the chassis 100 and is connected to pulley I. The rotating shaft of the air supply fan 400 extends out of the chassis 100 and is connected to pulley II. Pulley I and pulley II are connected by a belt. At the position corresponding to the belt on the chassis 100, there is a belt cover 700. By setting the belt cover 700, safety accidents caused by the exposure of the belt can be effectively avoided.

[0023] On the outer wall of the chassis 100, there are an electrical control box 800, a fuel pressure regulator box 900, and an air outlet 101. The electrical control box 800 and the fuel pressure regulator box 900 are arranged on the front outer wall of the chassis 100, and the air outlet 101 is opened on the left outer wall of the chassis 100.

[0024] On the outer wall of the fuel pressure regulator box 900, there is a pipe opening I - 901 for the gas supply pipe to pass through. On the chassis 100, there is a pipe opening II - 102 for the gas supply pipe to pass through. One end of the gas supply pipe is connected to the gas source, and the other end sequentially passes through the pipe opening I - 901, the pipe opening II - 102 and is connected to the gas passage 201 on the burner 200. The gas source is liquefied gas or natural gas. In this embodiment, the gas source is liquefied gas.

[0025] Preferably, the air supply pipeline includes an air supply main pipe, a main air supply pipe, and an auxiliary air supply pipe. The air inlet end of the air supply main pipe is connected to an air source, and the air outlet end of the air supply main pipe is respectively connected to the air inlet ends of the main air supply pipe and the auxiliary air supply pipe through a three-way valve. A large-flow inlet 202, a small-flow inlet 203, and an air inlet 204 for premixing air and gas are provided on the gas passage 201 of the burner 200. The air outlet end of the main air supply pipe is connected to the large-flow inlet 202, and a solenoid valve II is provided at the connection between the main air supply pipe and the large-flow inlet 202. The air outlet end of the auxiliary air supply pipe is connected to the small-flow inlet 203, and a solenoid valve I is provided at the connection between the auxiliary air supply pipe and the small-flow inlet 203.

[0026] The air outlet of the blower 300 is connected to the air inlet 204 for premixing air and gas through an auxiliary air passage 205, and the air outlet of the blower 300 is connected to the combustion chamber air inlet of the burner 200 through a main air passage. In this way, when the blower 300 operates, most of the air volume is blown to the combustion chamber through the main air passage, and a small part of the air volume enters the gas passage 201 (the gas passage for passing gas during secondary combustion) from the air inlet 204 for premixing air and gas.

[0027] The hot air outlet of the burner 200 is connected to the hot air inlet of the air wheel box 600 through a hot air passage 500, and the hot air outlet of the air wheel box 600 is communicated with the air outlet 101 on the chassis 100. The blower 400 and the air wheel act together to form a negative pressure in the air wheel box 600, so that the air heated by the burner 200 is discharged from the air outlet 101 on the chassis 100. Preferably, a temperature sensor for detecting the warm air temperature is provided at the air outlet 101.

[0028] A shutter 103 for allowing outside air to enter the chassis 100 is provided on the chassis 100, and the shutter 103 is arranged on the rear wall of the chassis 100. A makeup air inlet 501 is provided at one end of the hot air passage 500 close to the air wheel box 600. Under the action of the negative pressure, a small part of the outside air enters the air wheel box 600 through the shutter 103 and the makeup air inlet 501, mixes with the hot air, and is discharged from the air outlet 101 on the left side of the chassis 100.

[0029] A control system is installed in the control box. The control system includes a controller, a power switch, a blower pressure switch, a blower negative pressure switch, a temperature sensor, a solenoid valve I, a solenoid valve II, a burner, a flame detector for detecting the combustion flame of the burner, and a power supply for supplying power to the electrical components in the electrical control box. The signal output ends of the blower pressure switch, the blower negative pressure switch, and the temperature sensor are connected to the signal input end of the controller, and the signal output of the controller is connected to the blower 300, the blower 400, the solenoid valve I, the solenoid valve II, and the igniter.

[0030] The settings of the blower pressure switch and the induced draft fan negative pressure switch improve the safety factor during the use of this product. Only when it is ensured that the blower and the induced draft fan are working properly will the control system control the burner to work and the igniter to ignite, avoiding the phenomenon that the igniter ignites and the burner works when the induced draft fan or the blower is not working properly, resulting in the failure to discharge hot air in time.

[0031] The gas type in this embodiment is: liquefied gas; the gas flow rate is: 24.45 kg / h, 33.5 Nm³ / h; the thermal power: 350 kw; the gas pressure: 20 mbar; the outlet temperature: >150 °C; the ignition method: high-voltage ignition; the air volume: 6500 m³ / h; the rated voltage: 380 V; the rated power: 2.4 kw.

[0032] Working principle: During use, start the power supply, and the control system works. After the control system detects that the blower pressure switch is open and the induced draft fan negative pressure switch is open, it starts to control the blower 300 and the induced draft fan 400 to work. After the system detects that the blower pressure switch is closed and the induced draft fan negative pressure switch is closed (the blower pressure switch is used to detect the working state of the blower. When the blower 300 works (air enters the gas passage through the auxiliary air passage from the air inlet for air-gas premixing and enters the combustion chamber through the main air pipe), the blower pressure switch is closed, and the signal line of the blower pressure switch uploads the information of the blower being closed to the controller; similarly, the induced draft fan negative pressure switch is used to detect the working state of the induced draft fan. When the induced draft fan works, the induced draft fan negative pressure switch is closed, and the signal line of the induced draft fan negative pressure switch uploads the information of the induced draft fan negative pressure switch being closed to the controller), the controller starts to control the burner 200 to start, that is, the controller controls the igniter in the burner 200 to start igniting, and at the same time controls the solenoid valve I to open. The gas source enters the burner 200 through the gas supply main pipe, the auxiliary gas supply pipe, and the small flow inlet 203, entering the first-stage combustion stage. When the flame detector detects that the first-stage fire is burning normally, it sends the detected signal to the controller, and the controller controls the solenoid valve II to open. The gas source enters the burner 200 through the gas supply main pipe, the main gas supply pipe, and the large flow inlet 202, and the warm air blower enters the normal working state.

[0033] The present invention adopts a two-stage combustion method. During the first-stage combustion, the solenoid valve I is controlled to open, and the gas source supply adopts a small flow supply. When the flame detector detects that the first-stage fire is burning normally, the controller controls the solenoid valve II to open, and the gas source supply changes to a large flow supply, entering the second-stage combustion, that is, the warm air blower enters the normal working state. Adopting the two-stage combustion method solves the problems of the igniter not igniting normally or ignition failure, resulting in gas source waste and potential safety hazards of a large amount of gas source leakage.

[0034] The above are only the preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A high-power heater with high safety performance, characterized in that: It includes a chassis (100) with a hollow chamber. Inside the chassis (100), there are a burner (200), a blower (300), a forced-air blower (400), a hot-air channel (500), and a wind-wheel box (600). A wind wheel is provided inside the wind-wheel box (600), and the wind wheel is connected to the forced-air blower (400) through a belt. On the outer wall of the chassis (100), there are an electrical control box (800), a fuel pressure-regulating box (900), and an air outlet (101). A control system is installed inside the electrical control box (800). On the outer wall of the fuel pressure-regulating box (900), there is a pipe opening Ⅰ (901) for the gas supply pipe to pass through. On the chassis (100), there is a pipe opening Ⅱ (102) for the gas supply pipe to pass through. One end of the gas supply pipe is connected to a gas source, and the other end sequentially passes through the pipe opening Ⅰ (901) and the pipe opening Ⅱ (102) and is connected to a gas channel (201) on the burner (200). The air outlet of the blower (300) is connected to an air inlet (204) for premixing air and gas through an auxiliary air channel (205). The air outlet of the blower (300) is connected to the combustion-chamber air inlet of the burner (200) through a main air channel. The hot-air outlet of the burner (200) is connected to the hot-air inlet of the wind-wheel box (600) through the hot-air channel (500), and the hot-air outlet of the wind-wheel box (600) communicates with the air outlet (101) on the chassis (100). The gas supply pipe includes a main gas supply pipe, a main delivery pipe, and an auxiliary delivery pipe. The intake end of the main gas supply pipe is connected to a gas source. The outlet end of the main gas supply pipe is connected to the intake ends of the main delivery pipe and the auxiliary delivery pipe respectively through a three-way valve. On the gas channel, there are a large-flow inlet (202) and a small-flow inlet (203). The outlet end of the main delivery pipe is connected to the large-flow inlet (202), and an electromagnetic valve Ⅱ is provided at the connection between the main delivery pipe and the large-flow inlet (202). The outlet end of the auxiliary delivery pipe is connected to the small-flow inlet (203), and an electromagnetic valve Ⅰ is provided at the connection between the auxiliary delivery pipe and the small-flow inlet (203). The control system includes a flame detector for detecting the flame of the burner.

2. The high-power heater with high safety performance according to claim 1 is characterized in that: The control system further includes a controller, a power switch, a blower pressure switch, a forced-air blower negative-pressure switch, an electromagnetic valve Ⅰ, an electromagnetic valve Ⅱ, an igniter, and a power supply for supplying power to the electrical components inside the electrical control box. The signal output ends of the blower pressure switch and the forced-air blower negative-pressure switch are connected to the signal input end of the controller, and the signal output of the controller is connected to the electromagnetic valve Ⅰ, the electromagnetic valve Ⅱ, and the igniter.

3. The high-power heater with high safety performance according to claim 2, characterized in that: One end of the hot-air channel (500) close to the wind-wheel box (600) is provided with an air make-up opening (501).

4. A high-power warm air blower with high safety performance according to claim 3, characterized in that: On the chassis (100), there is a louver (103) for allowing outside air to enter the chassis (100), and the louver (103) is arranged on the side opposite to the electrical control box (800).

5. The high-power warm air blower with high safety performance according to claim 4, characterized in that: The rotating shaft of the wind wheel extends out of the chassis (100) and is connected to a pulley Ⅰ. The rotating shaft of the forced-air blower (400) extends out of the chassis (100) and is connected to a pulley Ⅱ. The pulley Ⅰ and the pulley Ⅱ are connected through a belt, and a belt cover (700) is provided on the chassis (100).

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