CN111322614A - A front premix burner for commercial gas stoves - Google Patents

Abstract

The invention discloses a pre-mixed burner for commercial gas stoves, which comprises a burner head, an ignition needle, an ion needle, a gas valve, a PWM fan, a Venturi premixer, a zero-pressure main gas solenoid valve, and a voltage regulator valve. , Pre-mix controller for commercial gas stoves. The present invention adopts the pre-mixing technology to completely mix the fuel and air before entering the nozzle of the burner combustion chamber, and fully stir and mix the gas molecules, so that the mixing is more complete, so that the combustion speed is no longer limited by the gas diffusion speed. and other physical conditions, the combustion speed is faster, the efficiency is higher, and the harmful CO emissions in the flue gas are reduced. At the same time, automatic pre-mixing technology is used to ensure accurate mixing. That is to ensure the safety of work, and will not produce the phenomenon of fire off, flame separation, tempering and so on.

Description

A front premix burner for commercial gas stoves

technical field

The invention relates to the field of commercial gas burners, in particular to a front premix burner for commercial gas stoves.

Background technique

With the continuous development of society, people's requirements for improving the living environment are gradually increasing. Natural gas, liquefied gas and other clean fuels have the characteristics of high combustion efficiency and clean combustion. They are recognized by people and increasingly valued by the society, and are widely used. And due to more and more gas projects, my country's gas application industry is in an important period of development. my country's gas consumption is huge, which makes the demand increase year by year, with an average annual growth rate of 10%-13%. The gas industry has created a certain gap in supply. At the same time, in order to improve the environment and deal with issues such as climate warming, energy-saving and environmentally friendly gas burning appliances such as diffusion burners and semi-premixed burners have been successively developed, which gradually meet the requirements of commercial use. The design and development of the appliance has opened a new model and entered a new era of safety, energy saving and environmental protection. In order to meet the eating habits of Chinese people, the commercial gasification widely used in schools, hotels, hotels and other catering establishments must have the characteristics of high heat load, high heat intensity at the bottom of the pot, and convenient use. Most of the existing commercial gasification in China adopts diffusion or semi-premixed combustion, with poor flow field design, low combustion efficiency and low heat transfer efficiency; high-power fans are used to provide power source, causing serious noise pollution. The above main factors make commercial gasification have the following characteristics: low efficiency, large fuel consumption, environmental pollution, high noise, and serious harm to the physical and mental health of operators. Therefore, it is urgent to improve the thermal efficiency of gasification, and it is very necessary to carry out comprehensive performances such as energy saving, environmental protection and safety of commercial gas burning appliances.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a front premix burner for commercial gas stoves, so as to solve the problems existing in the prior art gas burners.

In order to achieve the above object, the technical scheme adopted in the present invention is:

A front premix burner for commercial gas stoves, characterized in that it includes a control valve group, a PWM fan equipped with a Venturi premixer, and a burner head, wherein the control valve group is composed of a pressure-stabilizing valve, a zero-pressure The main pipe gas solenoid valve is composed. The inlet end of the pressure regulator valve is connected to the gas inlet pipe, the outlet end of the pressure regulator valve is connected to the inlet end of the zero pressure main pipe gas solenoid valve through the pipeline, and the outlet end of the zero pressure main pipe gas solenoid valve passes through the pipeline. The pipeline is connected to the inlet end of the PWM fan, the outlet end of the PWM fan is connected to the gas valve at the inlet end of the burner through the pipeline, the inlet end of the Venturi premixer leads to the external environment, and the outlet end of the Venturi premixer is connected To the inside of the PWM fan, the gas enters the PWM fan through the pressure regulator valve and the zero-pressure main gas solenoid valve, and then is sent out by the PWM fan, the inlet and outlet ends of the Venturi premixer form a pressure difference, so that the external ambient air After entering the PWM fan, it is fully premixed with the gas, and then sent to the burner by the PWM fan;

It also includes a pre-mixing controller for commercial gas stoves. The pre-mixing controller for commercial gas stoves is electrically connected to the PWM fan, gas valve, and zero-pressure main gas solenoid valve, respectively. The pre-mixing controller for commercial gas stoves controls the PWM based on digital signals. The fan works, and the pre-mixing controller of the commercial gas stove controls the opening and closing of the gas valve and the zero-pressure main gas solenoid valve.

The described front premix burner for commercial gas stoves is characterized in that: the burner head is equipped with an ignition needle and an ion needle, and the ignition needle and the ion needle are respectively electrically connected to the front premix controller of the commercial gas stove. , the state signals of the ignition needle and the ion needle are collected by the pre-mixing controller in front of the commercial gas stove.

The described front premix burner for commercial gas stoves is characterized in that: the commercial gas stove front premix controller is equipped with a display, and the commercial gas stove front premix controller is internally integrated with a remote transmission interface to realize data remote transmission and detection.

The described front premixed burner for commercial gas stoves is characterized in that: when the PWM fan generates suction pressure, the offset pressure is always kept at zero by the zero-pressure manifold gas solenoid valve, and the gas supply pipe is kept at zero. Pressure fluctuations in the network are compensated.

The described front premix burner for commercial gas stoves is characterized in that: the rotational speed of the PWM fan is regulated by the front premix controller of the commercial gas stove, so that the inlet and outlet of the Venturi premixer form different pressure differences, Then, the amount of air inhaled by the PWM fan is controlled to meet the ratio of gas and air under different heat loads, so as to achieve a stable combustion state.

In the present invention, when the inlet pressure fluctuates, the voltage stabilization device in the voltage stabilization valve produces corresponding actions to adjust the opening degree to keep the outlet pressure stable, so that the burning appliance is always in a good working state.

In the present invention, the signal to be controlled by the PWM fan is in digital form, and no digital-to-analog conversion is required, and the control module is simplified to realize the fan speed control. , and then control the amount of air inhaled by the fan to meet the ratio of gas and air under different heat loads, so as to achieve the stability of the combustion state.

In the present invention, the fuel and air are stably ignited and burned in the burner head according to the required gas volume, ratio and speed, and the inner ring of the burner head can be provided with a guide plate annularly surrounding the inside of the burner head to cool the burner head shell and prolong the furnace head. head life.

In the present invention, the ignition needle and the ion needle are electrically connected to the pre-mixing controller of the commercial gas stove, and the pre-mixing controller of the commercial gas stove performs ignition and flame state detection according to the electrical signals of the ignition needle and the ion needle.

In the present invention, the display connected to the pre-mixing controller of the commercial gas stove can display various parameters such as the operating state of the burner, fault display, etc., and the operator of the commercial stove can observe intuitively; the pre-mixing controller of the commercial gas stove has remote transmission. The interface can realize remote transmission and detection of operating data through the Internet of Things.

Compared with the prior art, the advantages of the present invention are:

1. The present invention adopts the pre-mixing method to completely mix the fuel and air before entering the nozzle of the burner combustion chamber, and fully stir and mix the gas molecules, so that the mixing is more complete, so that the combustion speed is no longer limited by the gas diffusion speed. and other physical conditions, the combustion speed is faster, the combustion heat intensity is high, and the flame is short; in production applications, the flame heat loss is often reduced and the heat transfer efficiency is increased by reducing the fire height of the furnace. The inlet air and larger area heat intensity and volume heat intensity can reduce the volume of the combustion equipment; because the combustion is relatively complete and the combustion temperature is high, the content of CO and NOX in the combustion products is very low, which is safe and environmentally friendly. The invention uses the automatic premixing technology to ensure the mixing is more accurate, that is, the work safety is ensured, and the phenomenon of fire off, flame separation, tempering and the like will not occur.

2. In the field of commercial gas burning appliances, PWM fans are first used to replace conventional air volume adjustment devices to avoid throttling losses caused by air regulation; it has high efficiency and high power factor, which reduces fan power and has obvious power saving effects; simple structure, fan The volume is greatly reduced; the fan adjustment range is wide, which can be adapted to a variety of gas stoves and different heat load requirements.

3. Compared with similar commercial gas stoves, the Venturi mixer of the front premix burner utilizes the Venturi tube effect to provide the best ratio of gas and air mixture for the burner control during the combustion process, and has a simple structure. The size of the equipment is greatly reduced, which greatly increases the scope of use of the pre-mixed burner, and is also convenient for installation.

Description of drawings

FIG. 1 is a schematic structural diagram of the present invention.

FIG. 2 is an enlarged view of the furnace head structure at A in FIG. 1 .

FIG. 3 is an enlarged view of the structure of the PWM fan and the Venturi premixer at B in FIG. 1 .

Description of the symbols in the figure: 1- Regulator valve, 2- Zero pressure manifold gas solenoid valve, 3- PWM fan, 4- Venturi premixer, 5- Gas valve, 6- Burner head, 7- Ignition needle, 8- Ion Needle, 9-Commercial gas cooktop premix controller.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

As shown in Figures 1 to 3, a pre-premix burner for commercial gas stoves includes a control valve group, a PWM fan 3 equipped with a Venturi premixer 4, and a burner 6, wherein:

The control valve group is composed of a pressure regulator valve 1 and a zero-pressure header gas solenoid valve 2. The inlet end of the regulator valve 1 is connected to the gas inlet pipe, and the outlet end of the regulator valve 1 is connected to the zero-pressure header gas solenoid valve 2 through the pipeline. The inlet end of the zero-pressure manifold gas solenoid valve 2 is connected to the inlet end of the PWM fan 3 through a pipeline, and the outlet end of the PWM fan 3 is connected to the gas valve 5 at the inlet end of the burner 6 through a pipeline, and the Venturi is premixed. The inlet end of the device 4 is connected to the external environment, and the outlet end of the Venturi premixer 4 is connected to the interior of the PWM fan 3 .

In the present invention, when the gas enters the PWM fan 3 through the pressure regulator valve 1 and the zero-pressure main gas solenoid valve 2, and then is sent out by the PWM fan 3, the inlet and outlet ends of the Venturi premixer 4 form a pressure difference, so that the external After the ambient air enters the PWM fan 3 and is fully premixed with the gas, it is sent to the burner 6 by the PWM fan 3 . When the PWM fan 3 generates suction pressure, the zero-pressure manifold gas solenoid valve 2 keeps the offset pressure at zero all the time, and compensates for pressure fluctuations in the gas supply pipe network.

The present invention also includes a pre-mixing controller 9 in front of a commercial gas stove. The pre-mixing controller 9 in front of a commercial gas stove is electrically connected to the PWM fan 3, the gas valve 5, and the zero-pressure main gas solenoid valve 2, respectively. The controller 9 controls the PWM fan 3 to work based on the digital signal, and the pre-mixing controller 9 of the commercial gas stove controls the opening and closing of the gas valve 5 and the zero-pressure main gas solenoid valve 2 .

The present invention regulates the rotational speed of the PWM fan 3 through the premixing controller 9 in front of the commercial gas stove, so that the inlet and outlet of the Venturi premixer 4 form different pressure differences, and then controls the amount of air inhaled by the PWM fan 3 to meet the requirements of different heat loads. The ratio of gas and air to achieve stable combustion state.

In the present invention, the burner 6 is provided with an ignition needle 7 and an ion needle 8. The ignition needle 7 and the ion needle 8 are respectively electrically connected to the pre-mixing controller 9 in front of the commercial gas stove, and the pre-mixing controller 9 collects the ignition Status signal of needle 7 and ion needle 8.

The pre-mixing controller for commercial gas stoves is equipped with a display, and the remote transmission interface is integrated inside the pre-mixing controller for commercial gas stoves to realize remote data transmission and detection.

When starting to use the commercial gas stove of the present invention, firstly turn on the power supply to perform power-on self-check, check whether the zero-pressure gas main solenoid valve 2 is in a closed state or have other abnormalities, and check whether the ion needle 8 has a flame ignition signal, and if there is a faulty commercial gas The pre-mix control on the cooktop indicates a fault code in the display. After the self-check is normal, the PWM fan 3 runs at full load to purge the furnace to prevent unburned gas in the furnace. After the purge is completed, the PWM fan 3 automatically reduces the load and is in the ignition state. At this time, the ignition needle 7 starts high-voltage discharge ignition, and the gas is ignited by steady When the pressure valve 1 is input, the zero-pressure gas main solenoid valve 2 is opened, and when the gas valve 5 is opened, the mixture of gas and air is ignited in the burner 6;

When it is necessary to increase the firepower, rotate the handle of the gas valve 5 (when the gas valve 5 is manually controlled), the handle drives the spherical valve core to follow the rotation, so that the gas supply increases, and the premixing controller 9 in front of the commercial gas stove controls the PWM fan 3 When the load increases, the air supply also increases synchronously and is mixed through the Venturi mixer 4 to ensure the ratio of gas and air to reach the burner 6 to satisfy stable and efficient combustion. Realize the adjustment of the intake air volume and the intake air volume at the same time by turning the valve handle.

During the cooking process, when the chef needs to load the pot, add seasoning, and the pot is removed from the furnace, it can be switched to the minimum heat to reduce unnecessary fuel consumption. At the same time, the load of the PWM fan 3 is reduced, and the heat in the furnace It will not be blown away, and the heat dissipation loss of the furnace will be minimized; when large firepower is required, switch to the large fire state with one key;

The embodiments of the present invention are only descriptions of the preferred embodiments of the present invention, and do not limit the concept and scope of the present invention. Various modifications and improvements made should fall within the protection scope of the present invention, and the technical content claimed in the present invention has been fully recorded in the claims.

Claims (5)

1. a front premix burner for commercial gas stoves, is characterized in that: comprise control valve group, be configured with the PWM blower of Venturi premixer, and burner head, described control valve group is composed of pressure-stabilizing valve, It consists of a zero-pressure header gas solenoid valve. The inlet end of the pressure-stabilizing valve is connected to the gas inlet pipe, the outlet of the pressure-stabilizing valve is connected to the inlet end of the zero-pressure header gas solenoid valve through a pipeline, and the outlet of the zero-pressure header gas solenoid valve is connected. The end is connected to the inlet end of the PWM fan through the pipeline, the outlet end of the PWM fan is connected to the gas valve at the inlet end of the burner through the pipeline, the inlet end of the Venturi premixer leads to the external environment, and the outlet of the Venturi premixer The terminal is connected to the inside of the PWM fan, so that the gas enters the PWM fan through the pressure regulator valve and the zero-pressure main gas solenoid valve, and then is sent out by the PWM fan, the inlet and outlet ends of the Venturi premixer form a pressure difference, so that the external After the ambient air enters the PWM fan and is fully premixed with the gas, it is sent to the burner by the PWM fan; It also includes a pre-mixing controller for commercial gas stoves. The pre-mixing controller for commercial gas stoves is electrically connected to the PWM fan, gas valve, and zero-pressure main gas solenoid valve, respectively. The pre-mixing controller for commercial gas stoves controls the PWM based on digital signals. The fan works, and the pre-mixing controller of the commercial gas stove controls the opening and closing of the gas valve and the zero-pressure main gas solenoid valve. 2 . The front premixed burner for a commercial gas stove according to claim 1 , wherein an ignition needle and an ion needle are arranged inside the burner head, and the ignition needle and the ion needle are respectively connected to the front of the commercial gas stove. 3 . The premixing controller is electrically connected, and the state signals of the ignition needle and the ion needle are collected by the premixing controller in front of the commercial gas stove. 3. The front premix burner for a commercial gas stove according to claim 1, wherein the premix controller for the commercial gas stove is equipped with a display, and the premix controller for the commercial gas stove is internally integrated The remote transmission interface realizes the remote transmission and detection of data. 4. A kind of front premix burner for commercial gas stove according to claim 1, it is characterized in that: when PWM blower generates suction pressure, the offset pressure is always kept at zero point by zero-pressure manifold gas solenoid valve , and compensate for pressure fluctuations in the gas supply network. 5. a kind of front premix burner for commercial gas stove according to claim 1, it is characterized in that: control PWM fan speed by the commercial gas stove front premix controller, make the inlet and outlet of venturi premixer Different pressure differences are formed, and then the amount of air inhaled by the PWM fan is controlled to meet the ratio of gas and air under different heat loads, and to achieve stable combustion state.

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