A natural gas heating protection device and control method thereof

Abstract

The invention discloses a natural gas heating protection device, comprising a combustion chamber, a fresh air inlet pipe is arranged on one side of the upper end of the combustion chamber, a wind scoop is arranged below the combustion chamber, a hot air blower volute impeller is arranged below the wind scoop, and the hot air blower volute impeller is connected to the hot air blower motor through a hot air blower belt. The invention also discloses a control method for the natural gas heating protection device, which can detect the temperature of the surrounding air duct caused by the natural gas heating furnace fire when the fan fails.

Description

Technical Field

[0001] The invention belongs to the technical field of printing machinery and control, and relates to a natural gas heating protection device. The invention also relates to a control method of the protection device. Background Art

[0002] The drying temperature of the decorative paper printing machine oven is high (180℃), and a natural gas furnace is needed as the heating source. When the oven fan fails, the temperature in the natural gas furnace is too high, which will cause damage to the adjacent hot air ducts. In mild cases, the paint on the hot air duct will change color and the duct will deform. In severe cases, it will cause a fire. Therefore, a protective device is needed to prevent safety accidents caused by fan failure. Summary of the invention

[0003] The object of the present invention is to provide a natural gas heating protection device, by which the temperature of the surrounding air duct caused by the natural gas heating furnace fire can be detected when a blower fails.

[0004] The object of the present invention is also to provide a control method for a natural gas heating protection device.

[0005] The first technical solution adopted by the present invention is a natural gas heating protection device, including a combustion chamber, a fresh air inlet pipe is provided on one side of the upper end of the combustion chamber, a wind scoop is provided below the combustion chamber, a hot air blower volute impeller is provided below the wind scoop, and the hot air blower volute impeller is connected to the hot air blower motor through a hot air blower belt.

[0006] The first technical solution of the present invention is also characterized in that:

[0007] A thermal resistance sensor is installed on the fresh air inlet duct.

[0008] The thermal resistance sensor is connected to the temperature controller.

[0009] The hot air blower volute impeller is also connected with a hot air pipe.

[0010] The second technical solution adopted by the present invention is a control method of a natural gas heating protection device, which specifically includes the following process:

[0011] Step 1, heating the color group oven temperature to the set working temperature, the temperature detected by the temperature controller is the set reference temperature of the natural gas heating protection device;

[0012] Step 2, adding 20 degrees to the reference temperature detected in step 1 as the set temperature of the temperature controller;

[0013] Step 3: The temperature controller compares the set temperature with the actual temperature and generates a signal to determine whether to shut down the flame in the combustion chamber.

[0014] The second technical solution adopted by the present invention is a control method of a natural gas heating protection device, which specifically includes the following process:

[0015] Step 1, heating the color group oven temperature to the set working temperature, the temperature detected by the temperature controller is the set reference temperature of the natural gas heating protection device;

[0016] Step 2, adding 20 degrees to the reference temperature detected in step 1 as the set temperature of the temperature controller;

[0017] Step 3: The temperature controller compares the set temperature with the actual temperature and generates a signal to determine whether to shut down the flame in the combustion chamber.

[0018] The second technical solution of the present invention is also characterized in that:

[0019] The specific process of step 3 is:

[0020] When the detected temperature is lower than the set temperature, the flame in the combustion chamber operates normally and the hot air blower volute impeller is in normal working condition;

[0021] When the detected temperature is higher than the set temperature, the flame in the combustion chamber stops working, and the system believes that the hot air blower volute impeller has stopped running and there is a mechanical or electrical failure.

[0022] The beneficial effect of the present invention is that, by using a natural gas heating protection device provided by the present invention, the air in the fresh air inlet pipe is heated by the flame of the combustion chamber, and is transported to the hot air pipe through the hot air blower impeller. The hot air blower motor drives the hot air blower impeller to rotate through the hot air blower belt, and the thermal resistance sensor installed on the fresh air inlet pipe detects the temperature at the current position. The temperature controller has an actual temperature display and a set temperature, and the actual temperature is compared with the set temperature, and a switch signal is output to control the switch of the natural gas heating furnace. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a front view of a natural gas heating protection device of the present invention;

[0024] Figure 2 The utility model is a bottom view of a natural gas heating protection device of the present invention.

[0025] In the figure, 1. fresh air inlet pipe, 2. combustion chamber, 3. wind scoop, 4. hot air blower volute impeller, 5. hot air pipe, 6. thermal resistor sensor, 7. hot air blower belt, 8. hot air blower motor, 9. temperature controller. DETAILED DESCRIPTION

[0026] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0027] The present invention provides a natural gas heating protection device, such as Figure 1 , 2 As shown, it includes a combustion chamber 2, a fresh air inlet pipe 1 connected to the combustion chamber 2, a wind scoop 3 connecting the combustion chamber 2 and the hot air blower volute impeller 4, a hot air blower belt 7 connecting the hot air blower volute impeller 4 and the hot air blower motor 8 power source together, and a thermal resistor sensor 6 is installed on the fresh air inlet pipe 1; a pulley is coaxially installed on the output shaft of the hot air blower motor 8, and the pulley is connected to the hot air blower volute impeller 4 through the hot air blower belt 7.

[0028] The air in the fresh air inlet pipe 1 is heated by the flame of the combustion chamber 2, and is transported to the hot air pipe 5 through the hot air blower volute impeller 4. The hot air blower motor 8 drives the hot air blower volute impeller 4 to rotate through the hot air blower belt 7, and the thermal resistor sensor 6 installed on the fresh air inlet pipe 1 detects the temperature at the current position.

[0029] The temperature controller 9, referred to as the thermostat, produces physical deformation inside the switch according to the temperature change of the working environment, thereby producing certain special effects, a series of automatic control elements that produce on or off actions, or electronic components at different temperatures and different working states to provide temperature data to the circuit for the circuit to collect temperature data.

[0030] The present invention provides a control method for a natural gas heating protection device. A thermal resistor sensor 6 on a fresh air inlet pipe 1 is electrically connected to a temperature controller 9 installed in a color group control cabinet. The temperature controller 9 has an actual temperature display and a set temperature. The actual temperature is compared with the set temperature, and a switch signal is output to control the switch of the natural gas heating furnace.

[0031] The specific steps include:

[0032] Step 1, installing a thermal resistance sensor 6 on the fresh air inlet pipe 1;

[0033] Step 2, heating the color group oven temperature to normal working temperature, the temperature detected by the temperature controller 9 is the set reference temperature of the natural gas heating protection device;

[0034] Step 3, adding 20 degrees to the reference temperature detected above as the set temperature of the temperature controller 9 of the heating protection device;

[0035] Step 4, the temperature controller 9 of the heating protection device compares the set temperature with the actual temperature and generates a signal to determine whether to shut down the flame in the combustion chamber 2.

[0036] The specific process is that when the detected temperature is lower than the set temperature, the flame in the combustion chamber 2 works normally and the hot air blower volute impeller 4 is in a normal working state. When the detected temperature is higher than the set temperature, the flame in the combustion chamber 2 stops working, and the system considers that the hot air blower volute impeller 4 stops running and there is a mechanical or electrical fault.

Claims

1. A control method for a natural gas heating protection device, characterized in that: A natural gas heating protection device is used, including a combustion chamber, a fresh air inlet pipe is arranged on one side of the upper end of the combustion chamber, a wind scoop is arranged below the combustion chamber, a hot air blower volute impeller is arranged below the wind scoop, and the hot air blower volute impeller is connected to the hot air blower motor through a hot air blower belt; A thermal resistance sensor is installed on the fresh air inlet pipe; The thermal resistance sensor is connected to the temperature controller; The hot air blower volute impeller is also connected to a hot air pipe; The specific process includes the following: Step 1, heating the color group oven temperature to the set working temperature, the temperature detected by the temperature controller is the set reference temperature of the natural gas heating protection device; Step 2, adding 20 degrees to the reference temperature detected in step 1 as the set temperature of the temperature controller; Step 3: The temperature controller compares the set temperature with the actual temperature and generates a signal to determine whether to shut down the flame in the combustion chamber.

2. The control method of a natural gas heating protection device according to claim 1 is characterized in that: The specific process of step 3 is as follows: When the detected temperature is lower than the set temperature, the flame in the combustion chamber operates normally and the hot air blower volute impeller is in normal working condition; When the detected temperature is higher than the set temperature, the flame in the combustion chamber stops working, and the system believes that the hot air blower volute impeller has stopped running and there is a mechanical or electrical failure.

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