CN213119082U

CN213119082U - Air inlet device of premixer, linear premixer and gas water heater

Info

Publication number: CN213119082U
Application number: CN202021410042.XU
Authority: CN
Inventors: 卢楚鹏; 廖振开; 潘同基; 张上兵; 张华平; 李罗标
Original assignee: Guangdong Vanward New Electric Co Ltd
Current assignee: Guangdong Vanward New Electric Co Ltd
Priority date: 2020-07-16
Filing date: 2020-07-16
Publication date: 2021-05-04
Anticipated expiration: 2030-07-16

Abstract

The utility model discloses an air inlet unit and linear premixer, gas heater of premixer, wherein the air inlet unit of premixer includes: the gas-fuel gas burner comprises a mounting seat, a gas inlet pipeline, a first gas channel and a second gas channel, wherein the mounting seat is internally provided with the gas inlet pipeline; the electric valve is fixed on the mounting seat and used for adjusting the opening of the first gas channel. The utility model has the advantages that: the utility model discloses a set up the motorised valve on air inlet unit, utilized the aperture that the motorised valve adjusted first gas passageway for the whole machine of water heater realizes the linear regulation that gas and air mix in advance in the interval of each load, and is special accurate controllable between the small load interval.

Description

Air inlet device of premixer, linear premixer and gas water heater

Technical Field

The utility model relates to a gas heater technical field, especially carry out the blender that mixes in full advance to air and gas among the gas heater.

Background

In a gas water heater, gas combustion is classified into diffusion combustion, partial premixed combustion (atmospheric combustion), and full premixed combustion. The fully premixed combustion (premixed combustion) refers to a process of fully mixing air and fuel gas in advance according to a certain proportion to form premixed gas, and then igniting and combusting the premixed gas in a combustor. Premixed combustion generally occurs in a relatively closed system. The premixed combustion has the advantages that the gas and the air (oxygen) are fully mixed before combustion, so that the flame propagation speed is higher, the combustion temperature is higher, the ductility is better compared with the diffusion combustion, and the premixed combustion is widely applied to gas appliances.

A premixer used in a traditional full-premixing combustion system comprises a shell, wherein a premixing cavity for mixing gas and air is arranged in the shell, and then an air inlet structure with a complex structure is arranged outside the shell, so that the air and the gas can smoothly enter the premixing cavity. And the current premixing cavity generally has only one mixing cavity, and the air inlet structure also has only one gas channel, so that the combustion of the combustion system can not be normally carried out under the low-load running state, the adjustment of the combustion system is small, and the use experience of a user is influenced. For this reason, a premixer comprising two mixing chambers and two gas passages has appeared in the prior art, which divides the traditional mixing chamber into two halves, one half being normally open (suitable for the working condition with a smaller load) and the other half being controllably open and closed (suitable for the working condition with a larger load). Specifically, the blade is arranged in one of the mixing chambers, the opening or closing of one of the gas passages is controlled by the blade so as to adjust the flow rate of the mixed gas input, the blade rotates according to different air pressures, the state of the blade is either fully opened or closed due to great uncertainty of changes of the air pressure, the gas cannot be output linearly, and particularly, the premixing of the gas and the air is not ideal at medium load.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide an air inlet unit and linear premixer of premixer to solve one or more technical problem that exist among the prior art, provide a profitable selection or create the condition at least.

The utility model provides a solution of its technical problem is: an air intake apparatus of a premixer comprising: the gas-fuel gas burner comprises a mounting seat, a gas inlet pipeline, a first gas channel and a second gas channel, wherein the mounting seat is internally provided with the gas inlet pipeline; the electric valve is fixed on the mounting seat and used for adjusting the opening of the first gas channel.

The utility model has the advantages that: the utility model discloses a set up the motorised valve on air inlet unit, utilized the aperture that the motorised valve adjusted first gas passageway for the whole machine of water heater realizes the linear regulation that gas and air mix in advance in the interval of each load, and is special accurate controllable between the small load interval.

As a further improvement of the above technical solution, the first gas channel and the second gas channel are parallel to each other.

As a further improvement of the above technical solution, the first gas channel and the second gas channel are disposed at the front end of the mounting seat, and nozzles are disposed at the front ends of the first gas channel and the second gas channel. By adding the nozzle, the outflow of the fuel gas can be more stable.

As a further improvement of the above technical solution, the first gas channel includes a first gas port; the electric valve comprises an electric switch part and a sealing plug, and the electric switch part drives the sealing plug to move relative to the first gas port so as to adjust the opening degree of the first gas port. The relative position of the sealing plug can be realized through the electric switch piece, and the opening degree of the first gas channel can be adjusted by adjusting the relative position of the sealing plug inside or outside the first gas port.

As a further improvement of the technical scheme, the electric switch part comprises an electric switch main body and a driving shaft, the driving shaft is fixedly connected with the sealing plug, and a reset elastic element is sleeved outside the driving shaft. By adding the elastic element, the first gas port can be guaranteed to be blocked by the sealing plug when the electric valve is not electrified.

And simultaneously, the utility model provides a linear premixer again, including foretell air inlet unit who mixes the ware, still include: the mixing device comprises a shell, a first mixing cavity and a second mixing cavity, wherein the shell is provided with a premixing cavity, a partition plate is arranged in the shell, the premixing cavity is divided into the first mixing cavity and the second mixing cavity by the partition plate, and the first mixing cavity comprises an air outlet passage; the first fuel gas channel is communicated with the first mixing chamber, and the second fuel gas channel is communicated with the second mixing chamber; and one end of the wind shield is hinged with the shell, and the wind shield blocks the air outlet passage of the first mixing chamber by utilizing the self gravity. The air inlet device of the premixer is independently arranged with the shell as an independent component, so that the structure of the premixer is simpler and more flexible.

The utility model discloses a linear premixer separates into two mixing chamber through utilizing the baffle with traditional single premixing chamber, utilizes the admission line of one to be two mixing chamber air supplies for the cavity structure of air mixture and gas is simpler, and gas mixes more evenly with the air premixing in different mixing chamber respectively. By matching with an electric valve and a wind shield, the whole water heater realizes the linear regulation of premixing of gas and air in each load interval, and is particularly accurately controllable in a small load interval.

As a further improvement of the technical scheme, a vertical channel and two transverse channels are arranged in the mounting seat, the vertical channel is the air inlet pipeline, the two transverse channels are the first fuel gas channel and the second fuel gas channel respectively, the mounting seat is detachably connected with the shell, and an air inlet gap is formed between the mounting seat and the shell. The air of the premixer enters the premixer through the air inlet gap and is fully premixed with the gas passing through the air inlet pipeline in the premixer.

As a further improvement of the technical scheme, the first mixing cavity is located below the second mixing cavity, the first fuel gas channel is located below the second fuel gas channel, and the mounting seat is further provided with a connector communicated with the air inlet pipeline. The connector is utilized to facilitate the connection of the premixer and the external gas pipe.

As a further improvement of the above technical solution, a shoulder is provided on the front side of the first mixing chamber, the shoulder includes a table top, the table top is inclined with the horizontal plane, the wind deflector is inclined downward from the rear to the front to cover the first mixing chamber with at least a part of the wind deflector, and the surface of the lower end of the wind deflector is overlapped with the table top of the shoulder.

As a further improvement of the above technical solution, a distance sensing element is provided on the shoulder, and the distance sensing element is in signal connection with the electric valve. By adding the distance sensing element, the control of the electric valve can be more accurate.

And simultaneously, the utility model also provides a gas heater who uses above-mentioned linear premixer.

Drawings

In order to more clearly illustrate the technical solution in the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly described below. It is clear that the described figures represent only some embodiments of the invention, not all embodiments, and that a person skilled in the art can also derive other designs and figures from these figures without inventive effort.

Fig. 1 is a schematic structural view of an air intake device of the present invention;

FIG. 2 is a schematic diagram of a linear premixer according to the present invention;

FIG. 3 is a schematic view of the linear premixer operating condition of the present invention;

fig. 4 is a schematic perspective view of a linear premixer of the present invention.

Detailed Description

The conception, the specific structure, and the technical effects produced by the present invention will be clearly and completely described below in conjunction with the embodiments and the accompanying drawings to fully understand the objects, the features, and the effects of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and other embodiments obtained by those skilled in the art without inventive labor based on the embodiments of the present invention all belong to the protection scope of the present invention. The preferred embodiment of the present invention is shown in the attached drawings, which are used to supplement the description of the text part of the specification with figures, so that one can intuitively and vividly understand each technical feature and the whole technical solution of the present invention, but they cannot be understood as the limitation of the protection scope of the present invention.

In the description of the present invention, it should be understood that the orientation or positional relationship indicated with respect to the orientation description, such as up, down, front, rear, left, right, etc., is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and does 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.

In the description of the present invention, a plurality of means are one or more, a plurality of means are two or more, and the terms greater than, less than, exceeding, etc. are understood as not including the number, and the terms greater than, less than, within, etc. are understood as including the number. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.

In the description of the present invention, unless there is an explicit limitation, the words such as setting, installation, connection, etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above words in combination with the specific contents of the technical solution. Meanwhile, all technical characteristics in the invention can be interactively combined on the premise of not conflicting with each other.

Referring to fig. 1 to 4, a linear premixer includes: a housing 100, an air intake 200 of the premixer, and a tuning system 300. The housing 100 has a premixing chamber, the premixing chamber is based on a venturi-shaped chamber structure, when the gas passes through the premixing chamber from back to front, a throat with a reduced cross section is arranged between an inlet and an outlet of the chamber, and after the air and the gas pass through the throat of the mixing chamber, different pressure differences and different flow speed differences are generated on the front side and the rear side of the throat. A throat with a smaller section is arranged between the inlet and the outlet, and according to the formula, the gas flow rate Q is equal to the gas flow speed V multiplied by the section area S, the gas flow rate V2 is equal to V1 multiplied by S1/S2, and the gas flow speed V changes along with the difference of the section area S.

A partition plate 130 is arranged in the casing 100, the partition plate 130 divides the premixing cavity into a first mixing chamber 110 and a second mixing chamber 120, the first mixing chamber 110 includes an air outlet passage, and a first air outlet 111 is arranged on the air outlet passage; the first mixing chamber 110 is located below the second mixing chamber 120, and the first gas channel 210 is located below the second gas channel 220;

the air inlet device 200 of the premixer comprises an air inlet pipe 230, a first gas channel 210 and a second gas channel 220, wherein the first gas channel 210 and the second gas channel 220 are both communicated with the air inlet pipe 230, the first gas channel 210 is communicated with the first mixing chamber 110, the second gas channel 220 is communicated with the second mixing chamber 120, and the first gas channel 210 comprises a first gas port 211; the air inlet device 200 of the premixer further comprises a mounting seat 240 and an electric valve 320, wherein a vertical channel and two transverse channels are arranged in the mounting seat 240, the vertical channel is the air inlet pipe 230, the two transverse channels are distributed as the first gas channel 210 and the second gas channel 220, the mounting seat 240 is detachably connected with the casing 100, and the electric valve 320 is mounted on the mounting seat 240. The mounting seat 240 is further provided with a connector, and the connector is communicated with the air inlet pipeline 230. The front ends of the first gas channel 210 and the second gas channel 220 are provided with nozzles 250. The electric valve 320 may be a proportional control valve, a stepper motor assembly, or an assembly capable of controlling the expansion and contraction of the screw.

The adjusting system 300 comprises a wind deflector 310, the upper end of the wind deflector 310 is hinged with the housing 100, and the wind deflector 310 covers the first air outlet 111 of the first mixing chamber 110 by using the self-gravity; the electric valve 320 comprises an electric switch 321 and a sealing plug 322, wherein the electric switch 321 drives the sealing plug 322 to move relative to the first gas port 211 so as to adjust the opening degree of the first gas port 211. The sealing plug 322 may gradually reduce the opening of the first fuel port 211 in the relative displacement from the far to the near with respect to the first fuel port 211, and may seal and cover the first fuel port 211.

In operation, the housing 100, the air intake device 200 of the premixer, and the adjustment system 300 are assembled, the mounting seat 240 is first screwed to the rear of the housing 100 with an air intake gap between the end surface of the mounting seat 240 and the end surface of the housing 100, the air deflector 310 is then installed in the first mixing chamber, the electric valve 320 is installed to the rear of the mounting seat 240, and the sealing plug 322 is made to face the first fuel port 211. After the assembly is finished, the linear premixer of the technical scheme is installed in a water heater, and the water heater comprises a fan. When the blower is activated, a pressure differential is created between the front and back of the premixer, which causes air to pass from the back to the front through the linear premixer from the gap between the mount 240 and the casing 100. When the air through mix the chamber in advance, because this mix the chamber in advance is venturi tube structure, the air that flows can produce the negative pressure in the laryngeal opening of cavity, and this negative pressure can make the gas enter into in mixing the chamber in advance, then gas and air can mix in mixing the chamber in advance, and the gas mixture after mixing is sent into the combustor in the water heater and is carried out the abundant burning. Because the air and the fuel gas are fully premixed in the premixer, the propagation speed of combustion flame in the combustor is high, the volume heat intensity of the combustion chamber is high, and complete combustion can be achieved under a small excess air coefficient. The working states of different loads of the water heater can be realized by adjusting the operating parameters of the fan of the water heater.

In the premixer, the second mixing chamber 120 and the second gas passage 220 are in a normal operation state, and the first mixing chamber 110 and the first gas passage 210 are in an adjustable state. The gas and the air can be premixed in different mixing chambers respectively, and the gas mixing is more uniform. Meanwhile, the electric valve 320 is used for adjusting the space in the first mixing chamber and the input amount of the fuel gas, particularly, the space in the first mixing chamber and the input amount of the fuel gas can be accurately controlled in a small load interval, and the stable air-fuel ratio of the air and the fuel gas is maintained in a preset load interval, so that the fuel gas can be stably and completely combusted in the whole water heater. And the rotation angle theta of the wind shield 310 is increased along with the increase of the rotation speed of the fan of the water heater, the relation between the opening delta of the sealing plug 322 and the rotation angle theta is adjusted, and the linear adjustment of the premixing of the gas and the air in each load interval of the whole water heater is realized.

In particular, the regulation principle of the first mixing chamber is as follows:

referring to fig. 3, when the fan is started, a negative pressure is formed in the premixing cavity to provide an upward lifting force F to the wind deflector 310, when the rotation speed of the fan increases from small to large, the lifting force F continuously increases, and when the lifting force F and the gravity G of the wind deflector 310 form balance, the wind deflector 310 rotates to be opened by a certain angle θ. Of course, the higher the speed of the fan, the greater the opening angle θ. The electric switch 321 is connected with the controller of the water heater, and only the second gas channel supplies gas when the load is small, and the electric switch 321 is started by a current signal when the load is large, so that the first gas channel also supplies gas. The controller also controls the rotating speed of the fan, the rotating angle theta of the wind shield is increased along with the increase of the rotating speed of the fan of the water heater, the opening delta of the sealing plug 322 is adjusted by the electric switch component to increase, and the linear adjustment of premixing of gas and air in each load interval of the whole water heater is realized by matching the relationship between the opening delta and the rotating angle theta.

It is understood that the electrically controlled switch 321 may be a proportional control valve, a stepper motor assembly, or a screw-controllable telescopic assembly.

Further in a preferred embodiment, the nozzle 250 is threadedly coupled to the mounting base 240. When mounting, the nozzle is first screwed into the mounting seat 240, and the mounting seat 240 is mounted on the housing 100.

Further as a preferred embodiment, the electric switch member 321 includes an electric switch main body and a driving shaft, the electric switch main body may be a commercially available motor, the driving shaft is fixedly connected with the sealing plug 322, and the driving shaft is further sleeved with a return elastic element 323. The elastic element 323 is preferably a compression spring. By adding a compression spring, when the electric switch element 321 is powered off, the elastic element 323 resets the sealing plug 322.

Further as a preferred embodiment, the front side of the first mixing chamber 110 is provided with a shoulder 112, the shoulder 112 comprises a table top, the table top is arranged obliquely to the horizontal plane, the wind deflector 310 is inclined downwards from back to front, and the surface of the lower end of the wind deflector 310 overlaps the table top of the shoulder 112. A distance sensing element 400 is disposed on the shoulder 112, and the distance sensing element 400 is in signal connection with the electric valve 320. In addition, a magnetic sheet is attached to the lower end of the wind deflector 310. When the first mixing chamber 110 is in a non-operating state, the wind deflector 310 is turned over under the action of its own weight, and the lower end of the wind deflector 310 abuts against the shoulder, so that the air outlet of the first mixing chamber 110 is blocked. And after the fan of water heater starts, the deep bead 310 upwards overturns under the effect of fan to open the gas outlet with first mixing chamber 110, the distance sensing element 400 that is located on the shoulder this moment passes through the opening distance of magnetic sheet perception deep bead 310, the change of distance produces different sensing signal, then with the controller in the signal feedback to the water heater, the controller starts electric switch spare 321, adjust the adjustment of sealing plug 322 to the aperture delta of first gas mouth according to the difference of distance value, and then realize that the gas transmission volume of first gas mouth forms linear relation with the rotatory distance of opening of deep bead.

While the preferred embodiments of the present invention have been described in detail, it will be understood by those skilled in the art that the invention is not limited to the details of the embodiments shown, but is capable of various modifications and substitutions without departing from the spirit of the invention.

Claims

1. An air intake apparatus for a premixer, characterized in that: the method comprises the following steps:

the gas-fuel combustion device comprises a mounting seat (240), wherein an air inlet pipeline (230), a first gas channel (210) and a second gas channel (220) are arranged in the mounting seat (240), and the first gas channel (210) and the second gas channel (220) are communicated with the air inlet pipeline (230);

an electric valve (320), wherein the electric valve (320) is fixed on the mounting seat (240), and the electric valve (320) is used for adjusting the opening degree of the first gas channel (210).

2. The air intake apparatus of a premixer according to claim 1, wherein: the first gas channel (210) and the second gas channel (220) are parallel to each other.

3. The air intake apparatus of a premixer according to claim 1, wherein: the first fuel gas channel (210) and the second fuel gas channel (220) are arranged at the front end of the mounting base (240), and nozzles (250) are arranged at the front ends of the first fuel gas channel (210) and the second fuel gas channel (220).

4. The air intake apparatus of a premixer according to claim 1, wherein: the first gas channel (210) comprises a first gas port (211); the electric valve (320) comprises an electric switch piece (321) and a sealing plug (322), wherein the electric switch piece (321) drives the sealing plug (322) to move relative to the first gas port (211) so as to adjust the opening degree of the first gas port (211).

5. The air intake apparatus of a premixer according to claim 4, wherein: the electric switch piece (321) comprises an electric switch main body and a driving shaft, the driving shaft is fixedly connected with the sealing plug (322), and a reset elastic element (323) is sleeved outside the driving shaft.

6. A linear premixer, characterized in that: an air intake apparatus comprising a premixer according to any one of claims 1-5, further comprising:

a housing (100) having a premix chamber, a partition (130) disposed in the housing (100), the partition (130) dividing the premix chamber into a first mixing chamber (110) and a second mixing chamber (120), the first mixing chamber (110) including an air outlet passage;

the first gas channel (210) is in communication with the first mixing chamber (110), and the second gas channel (220) is in communication with the second mixing chamber (120);

the wind deflector (310) is hinged to the shell (100) at one end, and the wind deflector (310) blocks an air outlet passage of the first mixing chamber (110) by using self gravity.

7. The linear premixer of claim 6, wherein: be equipped with vertical passageway and two transverse passage in mount pad (240), vertical passageway be intake duct (230), two transverse passage do respectively first gas passageway (210) and second gas passageway (220), mount pad (240) and casing (100) releasable connection, be equipped with the air admission clearance between mount pad (240) and casing (100).

8. The linear premixer of claim 6, wherein: first mixing chamber (110) is located the below of second mixing chamber (120), first gas passageway (210) are located the below of second gas passageway (220), still be equipped with the connector on mount pad (240), the connector with admission line (230) intercommunication.

9. The linear premixer of claim 6, wherein: the front side of the first mixing chamber (110) is provided with a shoulder (112), the shoulder (112) comprises a table top, the table top is obliquely arranged with the horizontal plane, the wind deflector (310) is obliquely inclined downwards from back to front to cover the first mixing chamber (110) with at least part of the wind deflector (310), and the surface of the lower end of the wind deflector (310) is overlapped with the table top of the shoulder (112).

10. The linear premixer of claim 9, wherein: the shoulder (112) is provided with a distance sensing element (400), and the distance sensing element (400) is in signal connection with the electric valve (320).

11. A gas water heater, its characterized in that: comprising a linear premixer according to any of the above claims 6-10.