CN209744374U - Gas equipment - Google Patents

Abstract

The utility model discloses a gas equipment, comprising: a burner; a gas premixing pipe, the gas premixing pipe defines an air flow channel, and the air flow channel has an air inlet and an air outlet, and in the direction from the air inlet to the air outlet, The air flow channel is divided into a contraction section, a mixing section and a diffusion section, and the gas premixing pipe has a gas inlet; a gas supply device, the gas supply device is connected with the gas inlet; a fan, the fan communicates with the air flow channel to drive the gas from the inlet The outlet flows in the direction of the gas outlet; the gas flame detection device, the gas flame detection device is used to detect the combustion flame condition of the burner; the controller, the controller is respectively electrically connected with the gas flame detection device and the fan, and the controller is provided according to the gas flame detection device. The flame detection signal regulates the opening of the gas inlet and the speed of the fan. The gas equipment according to the embodiment of the present invention can obtain a better air-fuel ratio under different gas source conditions, realize a stable load adjustment ratio, and reduce exhaust gas emissions.

Description

Gas equipment

technical field

The utility model relates to the technical field of water heaters, in particular to a gas equipment.

Background technique

Full premixed combustion refers to a combustion method in which gas is mixed with air before combustion, and no air is required to be supplied during the combustion process. This combustion method has a fast flame propagation speed and high combustion efficiency.

The Venturi type premixer is a necessary equipment in the pneumatic full premix combustion system. The Venturi type premixer injects the gas through the air. At present, most of the products are single-venturi premixers, and the ratio of the minimum load to the maximum load (referred to as the adjustment ratio) is generally 5:1, preferably 7:1. The minimum load to maximum load ratio of the double venturi premixer can reach 10:1.

In the case of a fully premixed wall-hung boiler, the larger the adjustment ratio, the larger the load adjustment range when heating or using hot water, and the higher the user's comfort. The supply of the mixed gas results in the stabilization of the combustion.

However, the gas sources in different regions are quite different. For example, the gas sources in China and Europe are quite different. When the gas source environment used by the gas equipment is quite different from the standard gas composition (the gas source composition tested before the product leaves the factory), The mixing ratio of air and gas cannot be guaranteed to be within the preset range, so that when the gas equipment is running, it is easy to cause a sharp increase in the emission of harmful gases. In other words, the current pneumatic full premixed combustion system cannot make adaptive adjustments to the air intake volume and the gas intake volume according to the actual air source conditions, so as to ensure that the exhaust gas emission is within an acceptable range.

Utility model content

The present invention aims to solve one of the above technical problems at least to a certain extent.

To this end, the present utility model proposes a gas-fired equipment, which has low requirements on gas source conditions, has a better air-fuel ratio, and has low exhaust gas emissions.

The gas equipment according to the embodiment of the present invention includes: a burner; a gas premixing pipe, the gas premixing pipe is used to provide a mixed gas of gas and air to the burner, and the gas premixing pipe defines an air flow channel, The air flow channel has an air inlet and an air outlet, and in the direction from the air inlet to the air outlet, the air flow channel is divided into a constricted section with a gradually reduced cross section, a mixing section with a constant cross section, and a cross section. A diffuser section that increases gradually, the gas premixing pipe has a gas inlet running through its wall thickness; a gas supply device, the gas supply device is connected with the gas inlet; a fan, the fan is connected to the gas inlet The air flow passages communicate with each other and are used for driving gas to flow from the air inlet to the air outlet; a gas flame detection device, which is used for detecting the combustion flame condition of the burner; a controller, the control The controller is respectively electrically connected to the gas flame detection device and the fan, and the controller regulates the opening of the gas inlet and the rotation speed of the fan according to the flame detection signal provided by the gas flame detection device.

According to the gas equipment of the embodiment of the present invention, the combustion flame condition of the burner is monitored in real time by the gas flame detection device, and the controller regulates the opening size of the gas inlet and the rotational speed of the fan according to the flame signal fed back by the gas flame detection device, thereby Ensure that the gas equipment can obtain a better air-fuel ratio under different gas source conditions, achieve a stable load adjustment ratio, and reduce exhaust emissions.

In addition, the gas equipment according to the embodiment of the present invention may also have the following additional technical features:

According to some embodiments of the present invention, the mixing section is divided into a first throat section and a second throat section that are independent of each other, and the first throat section and the second throat section are respectively fed with different fuel gases. Corresponding air ports, the inlet of the first throat section is communicated with the constricting section, the outlet of the first throat section is communicated with the diffusion section, and the outlet of the second throat section is communicated with the diffusion section, The inlet of the second throat section can be selectively communicated with the constricted section.

In an optional embodiment, a sealed gas cavity is formed on the outer periphery of the gas premixing pipe, and the gas cavity is connected to the gas supply device.

In a further optional embodiment, the gas cavity is an annular cavity, one end of the annular cavity is sealingly connected to the inlet end of the constricting section, and the other end of the annular cavity is connected to the outlet end of the diffusing section. Seal the connection.

In an optional embodiment, a baffle plate that can be selectively opened is provided on the side of the second throat segment facing the constricted segment.

In a further optional embodiment, the gas chamber is built in the airflow channel.

In a further optional embodiment, the opening and closing degree of the baffle is positively correlated with the opening of the gas inlet corresponding to the second throat section.

According to some embodiments of the present invention, the gas premixing pipe further comprises: a damper and a driving device, wherein the driving device drives the damper to open or close the gas inlet.

In an optional embodiment, the driving device is a stepping motor, and the stepping motor is connected to the controller.

According to some embodiments of the present invention, the gas mixing device further comprises: a solenoid valve, a valve plug of the solenoid valve is arranged opposite to the gas inlet, and the valve plug of the solenoid valve is displaced to control the The size of the opening of the gas inlet.

Additional aspects and advantages of the invention will be set forth, in part, from the following description, and in part will be apparent from the following description, or learned by practice of the invention.

Description of drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of embodiments in conjunction with the accompanying drawings, wherein:

Fig. 1 is a partial structural schematic diagram of gas equipment according to some embodiments of the present invention;

Fig. 2 is a partial structural schematic diagram of gas equipment according to other embodiments of the present invention;

Fig. 3 is a partial structural schematic diagram of gas equipment according to other embodiments of the present invention;

Fig. 4 is a partial structural schematic diagram of a gas equipment according to an embodiment of the present invention.

Reference number:

Gas equipment 100;

Gas premixing pipe 10;

Air flow channel 11;

air inlet 111;

air outlet 112;

constricted section 113; inlet end 1131;

Mixing section 114; gas inlet 1141; first throat section 1142; second throat section 1143; baffle 1144;

Diffusion section 115; outlet end 1151;

damper 116;

drive device 117;

annular cavity 20; gas cavity 21;

Detailed ways

The following describes in detail the embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary, and are intended to be used to explain the present invention, but should not be construed as a limitation of the present invention.

1-4 , a gas-fired appliance 100 according to an embodiment of the present invention will be described. The gas-fired appliance 100 is an appliance for heating or heating with heat generated by combustion of gas, and the gas-fired appliance 100 may be a gas-fired water heater or a wall-hung boiler. .

The gas equipment 100 of the embodiment of the present invention includes: a burner (not shown in the figure), a gas premixing pipe 10, a gas supply device (not shown in the figure), a fan (not shown in the figure), and a gas flame detection device (not shown in the figure). not shown) and a controller (not shown).

Specifically, the gas premixing pipe 10 is used to provide a mixed gas of gas and air to the burner. 1-3, the gas premixing pipe 10 defines an air flow channel 11, the air flow channel 11 has an air inlet 111 and an air outlet 112, and the direction from the air inlet 111 to the air outlet 112 (ie the direction of gas flow) above), the airflow channel 11 is divided into a constriction section 113 with a gradually decreasing cross section, a mixing section 114 with a constant cross section, and a diffuser section 115 with a gradually increasing cross section, wherein the gas premixing pipe 10 has a gas inlet through its wall thickness. Gas port 1141, the gas inlet 1141 is connected to the gas supply device.

It should be noted that the shrinking section 113 , the mixing section 114 and the diffusing section 115 of the gas premixing tube 10 may be independent tube structures, or may be integrally formed tube structures, no matter which molding method is adopted, the shrinking section 113, the mixing section 114 and the diffusing section 115 are all connected seamlessly.

In other words, the gas premixing pipe 10 provides a place where gas and air can be premixed. As shown in FIGS. 1-3 , the air flows into the airflow channel 11 from the air inlet 111 , and the gas enters the airflow channel through the gas inlet 1141 . within 11. As the air flows from the constriction section 113 to the mixing section 114, the flow area changes abruptly, and the air flow accelerates, thereby forming a local negative pressure in the mixing section 114 area, so that the gas injected into the air flow channel 11 is mixed with the air, and the mixed gas flows. When reaching the diffusion section 115, the flow area changes abruptly again, which intensifies the mixing degree of air and gas, so that the air and gas are fully mixed, and a better mixed gas is provided for the burner.

The fan communicates with the airflow channel 11 for driving the gas to flow from the air inlet 111 to the air outlet 112 . When the gas equipment 100 operates under a relatively large load, the air intake volume and the gas intake volume increase synchronously, wherein the air intake volume per unit time can be increased by increasing the fan speed, and the air intake volume of the gas intake port 1141 can be increased by increasing the fan speed. The opening degree increases the gas intake volume per unit time.

The gas flame detection device is used to detect the combustion flame condition of the burner. The controller is electrically connected with the gas flame detection device, and the controller regulates the opening of the gas inlet 1141 and the rotational speed of the fan according to the flame detection signal provided by the gas flame detection device.

The gas flame detection device may be a device for performing spectral analysis on gas combustion flame, or a device for performing image analysis on gas combustion flame. It can be understood that the above is only schematic, and is not a limitation to the embodiments of the present utility model. Any device that can detect the combustion characteristics of gas is within the scope of protection of the present invention.

Since the gas flame detection device can detect the combustion conditions in real time according to the combustion characteristics of the flame, and send the flame combustion conditions to the controller in real time, the opening size of the gas inlet 1141 and the rotation speed of the fan can be adjusted in real time to realize the increase or decrease. Intake of gas or air. In this way, when the gas source environment where the gas equipment 100 is located changes, the gas premixing pipe 10 can also mix a better mixture of air and gas to obtain the best air-fuel ratio.

For example, when the gas equipment 100 fails, such as when the fan fails, the controller can issue an instruction to close the opening of the gas inlet 1141, thereby preventing gas leakage and improving the operation safety of the gas equipment 100; under the same load condition, the combustion When the flame detection device detects that the color of the flame image is reddish or yellowish, it means that the oxygen is insufficient, and the controller can issue an instruction to increase the speed of the fan, thereby increasing the air intake.

Thus, according to the gas equipment 100 of the embodiment of the present invention, the combustion flame condition of the burner is monitored in real time by the gas flame detection device, and the controller regulates the opening size and the size of the gas inlet 1141 according to the flame signal fed back by the gas flame detection device. The rotational speed of the fan can be adjusted to ensure that the gas equipment 100 can obtain a better air-fuel ratio under different gas source conditions, achieve a stable load regulation ratio, and reduce exhaust gas emissions.

In some embodiments of the present invention, as shown in FIGS. 2 and 3 , the mixing section 114 is divided into a first throat section 1142 and a second throat section 1143 that are independent of each other, and the first throat section 1142 and the second throat section 1143 correspond to different gas inlets 1141111 respectively, the inlet of the first throat section 1142 is communicated with the constricting section 113, the outlet of the first throat section 1142 is communicated with the diffusion section 115, and the outlet of the second throat section 1143 is communicated with the diffusion section 115 In communication, the inlet of the second throat section 1143 and the constriction section 113 can be selectively communicated.

The airflow in the gas premixing pipe 10 is roughly as follows. When the second throat section 1143 is not connected to the constricted section 113, and the first throat section 1142 is connected to the constricted section 113, the air enters the constricted section 113 from the air inlet 111. , when the air flows to the first throat section 1142, a negative pressure is formed, and the fuel gas is injected into the airflow channel 11. In this case, the intake air volume of both air and fuel gas is small, and the gas equipment 100 is in a working state with a small load; When the second throat section 1143 is connected to the constricted section 113, and the first throat section 1142 and the second throat section 1143 are both connected to the constricted section 113, the air enters the constricted section 113 from the air inlet 111, and when the air flows to the first The throat section 1142 and the second throat section 1143 form a negative pressure to inject the gas into the airflow channel 11. In this case, the intake volume of both air and gas is large, and the gas equipment 100 is in a working state of heavy load.

Whether it is the first throat section 1142 or the second throat section 1143, the size of the opening of the gas inlet 1141 can be adjusted, thereby increasing the load adjustment ratio of the gas equipment 100 and improving the user's comfort.

In some optional embodiments, as shown in FIG. 1 and FIG. 2 , a sealed gas cavity 21 is formed on the outer periphery of the gas premixing pipe 10 , and the gas cavity 21 is connected to the gas supply device. That is, the gas chamber 21 acts as a temporary gas storage, so that the gas supply device can first deliver the gas into the gas chamber 21, and when the air flow channel 11 has a negative pressure, the gas is injected from the gas chamber 21 and brought into the air flow channel 11. Air mix.

In a further optional embodiment, the gas cavity 21 is an annular cavity 20 , one end of the annular cavity 20 is sealingly connected to the inlet end 1131 of the constricting section 113 , and the other end of the annular cavity 20 is sealingly connected to the outlet end 1151 of the diffusing section 115 . . That is, the gas cavity 21 is completely surrounded by the outer circumference of the gas premixing tube 10, so that the forming position of the gas inlet 1141 can be set in one of the mixing section 114, the constricting section 113 and the diffusing section 115, for example, a part of it can be distributed in The mixing section 114 and the other part are distributed in the shrinking section 113 or the diffusing section 115. Various choices of the molding position of the gas inlet 1141 can make the gas equipment 100 choose different gas inlet modes at different load stages, which is more conducive to obtaining Stable air-fuel ratio to ensure normal and stable combustion of the burner.

Wherein, the gas cavity 21 and the gas premixing pipe 10 may be mutually independent components, and seamless butt joints can be realized by welding.

In other optional embodiments of the present invention, the side of the second throat section 1143 facing the constricted section 113 is provided with a baffle 1144 that can be selectively opened. As shown in FIG. 2 and FIG. 3 , the baffle 1144 is substantially parallel to the cross section of the airflow channel 11 , and plays the role of blocking air from entering the second throat section 1143 . In other words, when the operating load of the gas equipment 100 is low, the baffle 1144 may not be opened, and at this time, the opening of the gas inlet 1141 corresponding to the second throat section 1143 is also closed. When the load of the gas equipment 100 is relatively high, the baffle 1144 is opened, and at this time, the opening of the gas inlet 1141 corresponding to the second throat section 1143 is also opened. In this way, the gas equipment 100 can obtain a better air-fuel ratio under any operating conditions.

Further, the baffle 1144 can be a one-way conduction device that only opens to one side. When the rotational speed of the fan is relatively large, and the baffle 1144 moves in the air outlet direction under the action of air pressure, thereby conducting the constriction section 113 and the second Throat segment 1143. That is, the baffle 1144 is adaptively opened as the wind pressure increases, and the gas inlet 1141 corresponding to the second throat section 1143 is also opened correspondingly.

Advantageously, the opening and closing degree of the baffle 1144 is positively related to the opening of the gas inlet 1141 corresponding to the second throat section 1143 . In this way, the unit intake volume of air and gas can be increased or decreased synchronously.

In other embodiments of the present invention, as shown in FIGS. 1-3 combined with FIG. 4 , the gas premixing pipe 10 further includes: a damper 116 and a driving device 117 , and the driving device 117 drives the damper 116 to open or close the gas inlet. 1141. That is, when the controller receives the flame signal from the gas flame detection device, it can control the driving device 117 to open or close the gas inlet 1141, thereby regulating the unit intake volume of air and gas.

In an optional embodiment, the driving device 117 is a stepping motor, and the stepping motor is connected to the controller. The stroke of the stepper motor is controlled by the flame combustion signal to obtain the best air-fuel ratio.

In other embodiments of the present invention, the gas mixing device further includes: a solenoid valve, the valve plug of the solenoid valve is arranged opposite to the gas inlet 1141, and the size of the opening of the gas inlet 1141 is controlled by the displacement of the valve plug of the solenoid valve . The magnetic field force generated by the solenoid valve is proportional to the displacement of the valve plug. For example, the magnetic field force can be adjusted by controlling the coil current input to the solenoid valve, thereby controlling the displacement of the valve plug, thereby effectively adjusting the gas inlet 1141 The size of the opening ensures that the gas premixing pipe 10 has a better air-fuel ratio.

In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "inside", "outside", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the It is described, rather than indicated or implied, that the device or element referred to must have a particular orientation, be constructed and operate in a particular orientation, and therefore should not be construed as limiting the invention.

In addition, the terms "first" and "second" are only used for descriptive purposes, and should not be construed as indicating or implying relative importance or implying the number of indicated technical features. Thus, a feature defined as "first" or "second" may expressly or implicitly include one or more of that feature. In the description of the present invention, "plurality" means two or more, unless otherwise expressly and specifically defined.

In the present utility model, unless otherwise expressly specified and limited, the terms "installation", "connection", "connection", "fixed" and other terms should be understood in a broad sense, for example, it may be a fixed connection or a detachable connection Connection, or integral connection; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be internal communication between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

In the present invention, unless otherwise expressly specified and limited, a first feature "on" or "under" a second feature may include the first and second features in direct contact, or may include the first and second features The features are not in direct contact but through additional features between them. Also, the first feature being "above", "over" and "above" the second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is level higher than the second feature. The first feature is "below", "below" and "beneath" the second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is level less than the second feature.

In the description of this specification, description with reference to the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples", etc., mean specific features described in connection with the embodiment or example , structure, material or feature is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Although the embodiments of the present invention have been shown and described above, it should be understood that the above embodiments are exemplary and should not be construed as limitations of the present invention. Variations, modifications, substitutions, and alterations to the above-described embodiments are possible within the scope of the present invention without departing from the principles and principles.

Claims (10)

1. A gas equipment, characterized in that, comprising: burner; A gas premixing pipe, the gas premixing pipe is used to provide a mixed gas of gas and air to the burner, and the gas premixing pipe defines an air flow passage, and the air flow passage has an air inlet and an air outlet, from which In the direction from the air inlet to the air outlet, the air flow channel is divided into a constriction section with a gradually reduced cross section, a mixing section with a constant cross section, and a diffuser section with a gradually increased cross section, and the gas premixing pipe has Gas inlets running through its wall thickness; a gas supply device, the gas supply device is connected to the gas inlet; a fan, which is communicated with the airflow channel for driving gas to flow from the air inlet to the air outlet; a gas flame detection device, the gas flame detection device is used to detect the combustion flame condition of the burner; a controller, which is electrically connected to the gas flame detection device and the fan respectively, and the controller regulates the opening of the gas inlet and the fan speed. 2 . The gas equipment according to claim 1 , wherein the mixing section is divided into a first throat section and a second throat section that are independent of each other, and the first throat section and the second throat section are respectively Corresponding to the different gas inlets, the inlet of the first throat section communicates with the constriction section, the outlet of the first throat section communicates with the diffuser section, and the outlet of the second throat section In communication with the diffuser section, the inlet of the second throat section can be selectively communicated with the constriction section. 3 . The gas equipment according to claim 1 , wherein a sealed gas cavity is formed on the outer periphery of the gas premixing pipe, and the gas cavity is connected to the gas supply device. 4 . 4 . The gas equipment according to claim 3 , wherein the gas cavity is an annular cavity, one end of the annular cavity is sealedly connected to the inlet end of the constricted section, and the other end of the annular cavity is sealed. 5 . One end is sealingly connected with the outlet end of the diffuser section. 5 . The gas equipment according to claim 2 , wherein a selectively openable baffle plate is provided on the side of the second throat section facing the constricted section. 6 . 6 . The gas equipment according to claim 3 , wherein the gas chamber is built in the airflow channel. 7 . 7 . The gas equipment according to claim 5 , wherein the opening and closing degree of the baffle is positively correlated with the opening of the gas inlet corresponding to the second throat section. 8 . 8 . The gas equipment according to claim 1 , wherein the gas premixing pipe further comprises: a damper and a driving device, the driving device driving the damper to open or close the gas inlet. 9 . 9 . The gas equipment according to claim 8 , wherein the driving device is a stepping motor, and the stepping motor is connected to the controller. 10 . 10 . The gas equipment according to claim 1 , wherein the gas mixing device further comprises: a solenoid valve, the valve plug of the solenoid valve is arranged opposite to the gas inlet, and the valve plug of the solenoid valve is opposite to the gas inlet. 10 . The displacement of the valve plug controls the opening size of the gas inlet.