CN209744374U

CN209744374U - Gas equipment

Info

Publication number: CN209744374U
Application number: CN201821908906.3U
Authority: CN
Inventors: 陆祖安
Original assignee: Wuhu Midea Kitchen and Bath Appliances Manufacturing Co Ltd
Current assignee: Wuhu Midea Smart Kitchen Appliance Manufacturing Co Ltd
Priority date: 2018-11-19
Filing date: 2018-11-19
Publication date: 2019-12-06
Anticipated expiration: 2028-11-19

Abstract

the utility model discloses a gas equipment, include: a burner; the gas premixing pipe defines a gas outlet channel, the gas flow channel is provided with a gas inlet and a gas outlet, the gas flow channel is divided into a contraction section, a mixing section and a diffusion section from the gas inlet to the gas outlet, and the gas premixing pipe is provided with a gas inlet; the gas supply device is connected with the gas inlet; the fan is communicated with the airflow channel and is used for driving the air to flow from the air inlet to the air outlet; the gas flame detection device is used for detecting the combustion flame condition of the combustor; the controller is respectively electrically connected with the gas flame detection device and the fan, and regulates and controls the opening of the gas inlet and the rotating speed of the fan according to a flame detection signal provided by the gas flame detection device. According to the utility model discloses gas equipment under different air supply conditions, the homoenergetic obtains the air-fuel ratio of preferred, realizes stable load regulation ratio, reduces exhaust emissions.

Description

Gas equipment

Technical Field

The utility model relates to a water heater technical field, more specifically relates to a gas equipment.

background

The full premix combustion is a combustion mode that gas is mixed with air before combustion, and air supply is not needed in the combustion process, and the combustion mode has the advantages of high flame propagation speed and high combustion efficiency.

the Venturi type premixer is necessary equipment in a pneumatic type full premixing combustion system, and injects fuel gas through air. Most of the current products are single venturi premixers, which typically have a minimum to maximum load ratio (abbreviated as turndown ratio) of 5:1, preferably 7: 1. The minimum load to maximum load ratio of the dual venturi premixer may reach 10: 1.

In the case of the fully premixed wall hanging stove, the larger the regulation ratio, the larger the load regulation range when heating or using hot water, and the higher the comfort of the user, and when the regulation ratio is smaller, the mixed gas cannot be stably supplied to cause the stable combustion when heating or using hot water.

However, the difference of the gas sources in various regions is large, for example, the difference of the gas sources in china and europe is large, and when the difference between the gas source environment used by the gas equipment and the standard gas component (gas source component debugged before the product leaves the factory) is large, the mixing ratio of the air and the gas cannot be ensured within a preset range, so that the emission of harmful gas is easily and rapidly increased when the gas equipment runs. In other words, the current pneumatic fully premixed combustion system cannot adaptively adjust the air inflow of air and the air inflow of gas according to the actual air source condition, so that the exhaust emission is ensured to be within an acceptable range.

SUMMERY OF THE UTILITY MODEL

the utility model discloses aim at solving one of above-mentioned technical problem to a certain extent at least.

Therefore, the utility model provides a gas equipment, this gas equipment requires lowly to the air supply condition, has the air-fuel ratio of preferred, and exhaust emissions is low.

According to the utility model discloses gas equipment includes: a burner; a gas premix tube for providing a mixture of gas and air to the burner, the gas premix tube defining a gas flow passage having a gas inlet and a gas outlet, the gas flow passage dividing, in a direction from the gas inlet to the gas outlet, into a converging section of progressively decreasing cross-section, a mixing section of constant cross-section, and a diverging section of progressively increasing cross-section, the gas premix tube having a gas inlet extending through a wall thickness thereof; the gas supply device is connected with the gas inlet; the fan is communicated with the airflow channel and is used for driving the air to flow from the air inlet to the air outlet; the gas flame detection device is used for detecting the combustion flame condition of the combustor; the controller is respectively electrically connected with the gas flame detection device and the fan, and regulates and controls the opening of the gas inlet and the rotating speed of the fan according to a flame detection signal provided by the gas flame detection device.

According to the utility model discloses gas equipment, through the burning flame situation of gas flame detection device real-time supervision combustor, the controller regulates and control the opening size of gas air inlet and the rotational speed of fan according to the flame signal of gas flame detection device feedback to guarantee that gas equipment under different air supply conditions, the homoenergetic obtains the air-fuel ratio of preferred, realizes stable load regulation ratio, reduces exhaust emissions.

In addition, according to the utility model discloses gas equipment, can also have following additional technical characterstic:

according to some embodiments of the utility model, first larynx section and second larynx section that mutually independent are separated into to the mixing section, first larynx section with second larynx section is respectively with the difference the gas air inlet is corresponding, the import of first larynx section with the contraction section intercommunication, the export of first larynx section with the divergent section intercommunication, the export of second larynx section with the divergent section intercommunication, the import of second larynx section with the contraction section selectively switches on.

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

In a further optional embodiment, the gas chamber is an annular chamber, one end of the annular chamber is hermetically connected with the inlet end of the contraction section, and the other end of the annular chamber is hermetically connected with the outlet end of the diffusion section.

In an alternative embodiment, a selectively openable baffle is arranged on one side of the second throat section facing the contraction section.

In a further alternative embodiment, the gas chamber is disposed internally within the gas flow passage.

In a further optional embodiment, the opening 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 invention, the gas premix tube further comprises: the air door is driven by the driving device to open or close the gas inlet.

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

According to some embodiments of the utility model, the gas mixing device still includes: the solenoid valve, the valve plug of solenoid valve with the gas air inlet sets up relatively, through the displacement control of the valve plug of solenoid valve the opening size of gas air inlet.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

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

Fig. 1 is a schematic partial structure view of a gas-fired device according to some embodiments of the present invention;

Fig. 2 is a schematic view of a partial structure of a gas appliance according to further embodiments of the present invention;

fig. 3 is a schematic view of a partial structure of a gas appliance according to further embodiments of the present invention;

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

Reference numerals:

a gas appliance 100;

a gas premix tube 10;

an airflow passage 11;

an air inlet 111;

An air outlet 112;

a constriction 113; an inlet end 1131;

A mixing section 114; a gas inlet 1141; a first throat section 1142; a second throat section 1143; a baffle 1144;

A diffuser segment 115; an outlet end 1151;

A damper 116;

a drive device 117;

An annular cavity 20; a gas chamber 21;

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.

Referring to fig. 1 to 4, a gas appliance 100 according to an embodiment of the present invention is described, the gas appliance 100 being an appliance for heating or warming by heat generated by gas combustion, the gas appliance 100 being a gas water heater or a wall-hanging stove.

The utility model discloses gas equipment 100 includes: a burner (not shown), a gas premix tube 10, a gas supply device (not shown), a fan (not shown), a gas flame detection device (not shown), and a controller (not shown).

specifically, the gas premix tube 10 is used to provide a mixture of gas and air to the combustor. Referring to fig. 1-3, the gas premix tube 10 defines a gas flow channel 11, the gas flow channel 11 having a gas inlet 111 and a gas outlet 112, the gas flow channel 11 being divided in a direction from the gas inlet 111 to the gas outlet 112 (i.e. in the gas flow direction) into a converging section 113 with a decreasing cross-section, a mixing section 114 with a constant cross-section and a diverging section 115 with an increasing cross-section, wherein the gas premix tube 10 has a gas inlet 1141 through its wall thickness, the gas inlet 1141 being connected to a gas supply.

it should be noted that the convergent section 113, the mixing section 114, and the divergent section 115 of the gas premix tube 10 may be of mutually independent tube structures, or may be of integrally formed tube structures, and the convergent section 113, the mixing section 114, and the divergent section 115 are all in seamless butt joint regardless of the forming method.

In other words, the gas premix tube 10 provides a location where the gas and air can be premixed, as shown in fig. 1-3, the air flows into the air flow path 11 from the gas inlet 111, and the gas enters the air flow path 11 through the gas inlet 1141. Because the air flows to the mixing section 114 from the contraction section 113, the flow area changes suddenly, the airflow accelerates, so that local negative pressure is formed in the mixing section 114 area, the gas is injected into the airflow channel 11 to be mixed with the air, when the mixed gas flows to the diffusion section 115, the flow area changes suddenly again, the mixing degree of the air and the gas is increased, the air and the gas are fully mixed, and better mixed gas is provided for the combustor.

the blower is communicated with the airflow channel 11 and is used for driving the air to flow from the air inlet 111 to the air outlet 112. When the gas equipment 100 operates at a large load, the air intake amount and the gas intake amount are increased synchronously, wherein the air intake amount in unit time can be increased by increasing the rotating speed of the fan, and the gas intake amount in unit time can be increased by increasing the opening degree of the gas inlet 1141.

The gas flame detection device is used for detecting the combustion flame condition of the combustor. The controller is electrically connected with the gas flame detection device and regulates and controls the opening of the gas inlet 1141 and the rotating speed of the fan according to a flame detection signal provided by the gas flame detection device.

Gas flame detection device can be for carrying out spectral analysis's device to gas combustion flame, perhaps for carrying out image analysis's device to gas combustion flame, and it can be understood that the aforesaid is only schematic, and is not right the utility model discloses a restriction, any device that can detect out the gas combustion characteristic is in within the protection scope of the utility model.

Because the gas flame detection device can carry out real-time detection to the burning operating mode according to the burning characteristic of flame to send the flame burning situation for the controller in real time, thereby can regulate and control the opening size of gas air inlet 1141 and the rotational speed of fan in real time, realize the air input of increase and decrease gas or air. Thus, when the gas source environment of the gas appliance 100 changes, the gas pre-mixing pipe 10 can also mix the air and the gas to obtain the optimal air-fuel ratio.

For example, when the gas appliance 100 fails, for example, when the fan fails, the controller may send a command to close the opening of the gas inlet 1141, so as to prevent gas leakage and improve the safety of the operation of the gas appliance 100; under the same load condition, when the combustion flame detection device detects that the color of the flame image is red or yellowish, the oxygen is insufficient, and the controller can send an instruction for increasing the rotating speed of the fan, so that the air inflow of air is increased.

From this, according to the utility model discloses gas equipment 100, through the burning flame situation of gas flame detection device real-time supervision combustor, the controller regulates and control the opening size of gas air inlet 1141 and the rotational speed of fan according to the flame signal of gas flame detection device feedback to guarantee that gas equipment 100 under different air supply conditions, the homoenergetic obtains the air-fuel ratio of preferred, realizes stable load regulation ratio, reduces exhaust emissions.

In some embodiments of the present invention, as shown in fig. 2 and 3, the mixing section 114 is divided into a first throat section 1142 and a second throat section 1143 which are independent of each other, 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 contracting section 113, the outlet of the first throat section 1142 is communicated with the diffusing section 115, the outlet of the second throat section 1143 is communicated with the diffusing section 115, and the inlet of the second throat section 1143 is selectively communicated with the contracting section 113.

The air flow mode in the gas premix tube 10 is roughly as follows, when the second throat section 1143 is not communicated with the contraction section 113, and the first throat section 1142 is communicated with the contraction section 113, the air enters the contraction section 113 from the air inlet 111, when the air flows to the first throat section 1142, negative pressure is formed, and the gas is injected into the air flow channel 11, under the condition, the air inflow of the air and the gas is less, and the gas equipment 100 is in a low-load working state; when the second throat section 1143 is communicated with the contraction section 113, and the first throat section 1142 and the second throat section 1143 are both communicated with the contraction section 113, air enters the contraction section 113 from the air inlet 111, negative pressure is formed when the air flows to the first throat section 1142 and the second throat section 1143, and fuel gas is injected into the air flow channel 11.

No matter the first throat section 1142 or the second throat section 1143, the opening size of the gas inlet 1141 can be regulated and controlled, so that the load regulation ratio of the gas equipment 100 can be increased, and the use comfort of a user is improved.

In some alternative embodiments, as shown in fig. 1 and 2, a sealed gas chamber 21 is formed at the outer circumference of the gas premix tube 10, and the gas chamber 21 is connected to a gas supply device. That is, the gas chamber 21 serves as a temporary gas storage, so that the gas supply device can firstly deliver gas into the gas chamber 21, and when negative pressure occurs in the airflow channel 11, the gas is ejected from the gas chamber 21 and brought into the airflow channel 11 to be mixed with air.

in a further alternative embodiment, the gas chamber 21 is an annular chamber 20, one end of the annular chamber 20 is sealingly connected to the inlet end 1131 of the convergent section 113, and the other end of the annular chamber 20 is sealingly connected to the outlet end 1151 of the divergent section 115. That is, the gas cavity 21 entirely surrounds the periphery of the gas premix tube 10, so that the forming position of the gas inlet 1141 may be set at one of the mixing section 114, the contraction section 113 and the diffusion section 115, for example, a part of the gas inlet may be distributed at the mixing section 114, another part may be distributed at the contraction section 113 or the diffusion section 115, and various choices of the forming position of the gas inlet 1141 may enable the gas device 100 to select different gas inlet modes at different load stages, which is more favorable for obtaining a stable air-fuel ratio and ensures the normal and stable combustion of the combustor.

The gas cavity 21 and the gas premix tube 10 may be independent components, and seamless butt joint is achieved by welding.

in other optional embodiments of the present invention, a selectively openable baffle 1144 is disposed on a side of the second throat section 1143 facing the contraction section 113. As shown in fig. 2 and 3, the baffle 1144 is generally parallel to the cross-section of the airflow passage 11 and functions to block air from entering the second throat section 1143. In other words, when the load at which the gas plant 100 is operated 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 at which the gas combustion apparatus 100 is operated is high, the baffle 1144 is opened, and at this time, the opening of the gas intake port 1141 corresponding to the second throat section 1143 is also opened. In this way, the gas appliance 100 can obtain a better air-fuel ratio under any operation condition.

Further, the baffle 1144 may be a one-way conduction device that is opened only to one side, when the rotation speed of the blower is high, and the baffle 1144 moves in the air outlet direction under the action of air pressure, so as to conduct the contraction section 113 and the second throat section 1143. That is, the baffle 1144 is opened adaptively as the wind pressure increases, and the gas inlet 1141 corresponding to the second throat section 1143 is also opened correspondingly.

advantageously, the opening of the baffle 1144 is positively correlated with the opening of the gas inlet 1141 corresponding to the second throat section 1143. Therefore, the synchronous increase or synchronous decrease of the unit air inflow of the air and the unit air inflow of the fuel gas can be met.

in other embodiments of the present invention, as shown in fig. 1-3 in conjunction with fig. 4, the gas premix tube 10 further includes: a damper 116 and a driving device 117, wherein the driving device 117 drives the damper 116 to open or close the gas inlet 1141. That is, when the controller receives a flame signal from the gas flame detection device, the controller may control the driving device 117 to open or close the gas inlet 1141, so as to control the unit air inflow of air and gas.

in an alternative embodiment, the driving device 117 is a stepping motor, and the stepping motor is connected to the controller. The stroke of the stepping motor is controlled by flame combustion signals, and the optimal air-fuel ratio is obtained.

In other embodiments of the present invention, the gas mixing device further comprises: the solenoid valve, the valve plug and the relative setting of gas inlet 1141 of solenoid valve, the displacement control gas inlet 1141's through the valve plug of solenoid valve opening size. The magnetic force generated by the solenoid valve is proportional to the displacement of the valve plug, for example, the magnetic force can be adjusted by controlling the coil current of the input solenoid valve, so as to control the displacement of the valve plug, thereby effectively adjusting the opening size of the gas inlet 1141 and ensuring that the gas premixing pipe 10 has a better air-fuel ratio.

In the description of the present invention, it is to be understood that the terms "inside", "outside", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

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

In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly above and obliquely above the second feature, or simply meaning that the first feature is at a lesser level than the second feature.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above 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 embodiments of the present invention have been shown and described, it is to be understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that changes, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art without departing from the principles and spirit of the present invention.

Claims

1. A gas-fired appliance, comprising:

A burner;

A gas premix tube for providing a mixture of gas and air to the burner, the gas premix tube defining a gas flow passage having a gas inlet and a gas outlet, the gas flow passage dividing, in a direction from the gas inlet to the gas outlet, into a converging section of progressively decreasing cross-section, a mixing section of constant cross-section, and a diverging section of progressively increasing cross-section, the gas premix tube having a gas inlet extending through a wall thickness thereof;

The gas supply device is connected with the gas inlet;

The fan is communicated with the airflow channel and is used for driving the air to flow from the air inlet to the air outlet;

The gas flame detection device is used for detecting the combustion flame condition of the combustor;

The controller is respectively electrically connected with the gas flame detection device and the fan, and regulates and controls the opening of the gas inlet and the rotating speed of the fan according to a flame detection signal provided by the gas flame detection device.

2. The gas plant according to claim 1, characterized in that said mixing section is divided into a first throat section and a second throat section independent of each other, said first throat section and said second throat section corresponding to different gas inlets, respectively, the inlet of said first throat section communicating with said converging section, the outlet of said first throat section communicating with said diverging section, the outlet of said second throat section communicating with said diverging section, the inlet of said second throat section selectively communicating with said converging section.

3. Gas appliance according to any of claims 1-2, characterized in that the outer circumference of the gas premix tube is formed with a sealed gas chamber, which is connected with the gas supply.

4. the gas appliance according to claim 3, wherein the gas chamber is an annular chamber, one end of the annular chamber is hermetically connected with the inlet end of the contraction section, and the other end of the annular chamber is hermetically connected with the outlet end of the diffusion section.

5. The gas fired device of claim 2, wherein a side of the second throat section facing the constrictor is provided with a selectively openable flap.

6. The gas fired appliance of claim 3, wherein the gas chamber is built into the gas flow passage.

7. The gas fired device of claim 5, wherein the degree of opening of the baffle is positively correlated to the opening of the gas inlet corresponding to the second throat section.

8. The gas fired plant of claim 1, said gas premix tube further comprising: the air door is driven by the driving device to open or close the gas inlet.

9. The gas-fired apparatus according to claim 8, wherein the drive means is a stepper motor, said stepper motor being connected to said controller.

10. the gas appliance of claim 1, wherein the gas mixing device further comprises: the solenoid valve, the valve plug of solenoid valve with the gas air inlet sets up relatively, through the displacement control of the valve plug of solenoid valve the opening size of gas air inlet.