CN216953038U

CN216953038U - Premixer structure

Info

Publication number: CN216953038U
Application number: CN202123278522.2U
Authority: CN
Inventors: 卢楚鹏; 潘同基; 李罗标; 张上兵; 张华平
Original assignee: Guangdong Vanward New Electric Co Ltd
Current assignee: Guangdong Vanward New Electric Co Ltd
Priority date: 2021-12-23
Filing date: 2021-12-23
Publication date: 2022-07-12
Anticipated expiration: 2031-12-23

Abstract

The utility model discloses a premixer structure, comprising: the air conditioner comprises a shell, wherein a premixing cavity is arranged in the shell and comprises an air outlet passage; the gas channel is communicated with the premixing cavity; the baffle is hinged in the shell and used for adjusting the opening of the air outlet passage; and the limiting mechanism is used for limiting the opening angle of the baffle. Compared with the prior method for adjusting the heat load, which is to adjust the gas flow and the fan rotating speed or change the parameters of the baffle structure, the shape, the quality and the like, the utility model can realize stable heat load adjustment ratio only by arranging the limiting mechanism, and has lower adjustment cost.

Description

Premixer structure

Technical Field

The utility model relates to a gas water heater, in particular to a premixer structure.

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. Since the premixed combustion is performed by fully mixing the gas and the air (oxygen) before combustion, the flame propagation speed is higher, the combustion temperature is higher, the efficiency is higher and the premixed combustion is widely applied to gas appliances compared with diffusion combustion.

The structure cavity of the premixer in the traditional full premix combustion system is complex, the production and processing procedures are more, and the production cost is high. Meanwhile, because the air paths of different air sources are different in amount, when the water heater is used for different air sources, different premixers are often required to be replaced, or the regulation and control program of the rotating speed of the fan is redesigned, so that the production cost of enterprises is undoubtedly increased.

SUMMERY OF THE UTILITY MODEL

It is an object of the present invention to provide a premixer structure, which solves one or more technical problems in the prior art, and at least provides a useful choice or creation.

The solution of the utility model for solving the technical problem is as follows:

a premixer structure comprising:

the air conditioner comprises a shell, wherein a premixing cavity is arranged in the shell and comprises an air outlet passage;

the gas channel is communicated with the premixing cavity;

the baffle is hinged in the shell and used for adjusting the opening of the air outlet passage;

and the limiting mechanism is used for limiting the opening angle of the baffle.

Compared with the background technology, the premixer structure of the utility model has the following beneficial effects:

through having increased the baffle, when inoperative, utilize the baffle to seal completely and mix the chamber in advance, effectively prevent that cold air from flowing backwards to the heat exchanger in the water heater and causing the damage, protection product normal use improves its life, also prevents that the high temperature flue gas from flowing backwards inside fan and water heater, reaches the poisoning of prevention flue gas and frost-proof effect, improves product security greatly. And when the water heater work, be equipped with the fan in the water heater, the fan starts the back, can drive the baffle and move gradually, open the route of giving vent to anger then gradually, through having add stop gear, play spacing effect to the motion of baffle, make the baffle can fix a certain position, make air and gas in the water heater maintain stable air-fuel ratio according to predetermined load interval, realize the stability and the complete combustion of gas in the water heater complete machine, simultaneously through spacing the baffle, can control the angle that the baffle was opened, and then the air inlet demand of the multiple different air supplies of adaptation. Compared with the prior method for adjusting the heat load, which is to adjust the gas flow and the fan rotating speed or change the parameters of the baffle structure, the shape, the quality and the like, the utility model can realize stable heat load adjustment ratio only by arranging the limiting mechanism, and has lower adjustment cost.

In one embodiment, the limiting mechanism comprises a control part and a limiting part, the control part is movably connected with the shell, at least part of the limiting part is located in the premixing cavity and can be abutted against the baffle, and the control part rotates to drive the depth of the limiting part in the premixing cavity so as to limit the opening angle of the baffle.

In one embodiment, the housing is provided with a through hole communicated with the premixing cavity, the through hole is internally provided with an internal thread, the limiting part is provided with an external thread matched with the internal thread, and the limiting part is in threaded connection with the through hole.

In one embodiment, the device further comprises an electric adjusting part, wherein the electric adjusting part is used for controlling and driving the limiting mechanism; or, still include manual regulation portion, manual regulation portion at least part shows outside the casing, manual regulation portion is used for driving stop gear.

In one embodiment, the premix chamber includes a first premix chamber and a second premix chamber having a minimum cross-sectional area greater than a minimum cross-sectional area of the first premix chamber.

In one embodiment, the first premix chamber and the second premix chamber are each a venturi passage.

In one embodiment, a first baffle is hinged in the first premixing cavity, a second baffle is hinged in the second premixing cavity, and the driving acting force of the first baffle is smaller than that of the second baffle.

In one embodiment, the limiting mechanism is arranged in the first premixing cavity and used for limiting the opening angle of the first baffle.

In one embodiment, an adjusting screw is arranged in the gas channel and used for adjusting the minimum flow area of the gas channel.

In one embodiment, a safety cover for sealing a gas outlet of the gas channel is further arranged in the premixing cavity.

Drawings

FIG. 1 is a schematic diagram of a premixer configuration according to the present invention;

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

description of reference numerals: 100. a housing; 101. a contraction section; 102. a throat; 103. a diffuser section; 104. a gas channel; 105. a premix chamber; 106. a first premix chamber; 107. a second premix chamber; 200. a baffle plate; 201. a first baffle plate; 202. a second baffle; 300. a limiting mechanism; 301. a control unit; 302. a limiting part; 400. adjusting the screw rod.

Detailed Description

The technical solutions in the embodiments of the present application will be described clearly and completely with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only some embodiments of the present application, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

In the description of the present application, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present application and simplifying the description, but do not indicate or imply that the referred device or element must have a particular orientation, be constructed in a particular orientation, and be operated, and thus should not be construed as limiting the present application.

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 application, "a plurality" means two or more unless otherwise specified.

In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; 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 application can be understood in a specific case by those of ordinary skill in the art.

Referring to fig. 1-2, a premixer structure comprises:

the air conditioner comprises a shell 100, wherein a premixing cavity 105 is arranged in the shell 100, and the premixing cavity 105 comprises an air outlet passage;

a gas channel 104, wherein the gas channel 104 is communicated with the premixing cavity 105;

a baffle 200, the baffle 200 being hinged in the housing 100, the baffle 200 being used to adjust the opening of the air outlet passage;

and a limiting mechanism 300 for limiting the opening angle of the baffle 200.

In the utility model, the premixing cavity 105 sequentially comprises a contraction section 101, a throat 102 and a diffusion section 103 from back to front, wherein the diffusion section 103 comprises an air outlet passage; the baffle 200 is arranged in the diffusion section 103 of the premixing cavity 105, the baffle 200 inclines downwards from back to front, a shoulder is arranged in the diffusion section 103, the shoulder is provided with an inclined table board, when the water heater does not work, the baffle 200 is obliquely arranged, the diffusion section 103 is blocked under the gravity of the baffle 200, namely, the baffle 200 is abutted against the table board and completely blocks the diffusion section 103, namely, an air outlet passage of the premixing cavity 105 is blocked, cold air is effectively prevented from flowing back to a heat exchanger in the water heater to cause damage, high-temperature smoke is also prevented from flowing back to a fan and the inside of the water heater, the effects of preventing smoke poisoning and freezing are achieved, the normal use of a product is protected, the service life of the product is prolonged, and the safety of the product is greatly improved. When the water heater works, the fan is arranged in the water heater, and after the fan is started, the baffle 200 can be driven to move gradually, namely the opening degree of the air outlet passage is increased gradually, and because the opening angle of the baffle 200 is influenced by the rotating speed of the fan, the rotating speed of the fan is very low when the load is small, and the stability of the fan is influenced by the reduction of the rotating speed; the limiting mechanism 300 is additionally arranged, the movement of the baffle 200 is limited, the baffle 200 can be fixed at a certain position, the air-fuel ratio of the air and the fuel gas in the water heater is kept stable in a preset load interval, the fuel gas is stably and completely combusted in the whole water heater, and meanwhile, the opening angle of the baffle 200 can be controlled by limiting the baffle 200, so that the air inlet requirements of various different air sources are met. Compared with the existing method for adjusting the heat load, which is to adjust the gas flow and the fan rotating speed or change the parameters of the baffle 200 such as structure, shape and quality, the utility model can realize stable heat load adjustment ratio only by arranging the limiting mechanism 300, and the adjustment cost is lower.

As a preferred embodiment, the limiting mechanism 300 includes a control portion 301 and a limiting portion 302, the control portion 301 is movably connected to the housing 100, the limiting portion 302 is at least partially located in the premix chamber 105 and can abut against the baffle 200, and the control portion 301 rotates to drive the depth of the limiting portion 302 in the premix chamber 105 to limit the opening angle of the baffle 200. The limiting mechanism 300 of the embodiment limits the opening angle of the baffle 200 by the depth of the limiting part 302 extending into the premixing cavity 105, and has the characteristics of simple structure and convenience in operation.

As a preferred embodiment, a through hole communicated with the premix chamber 105 is formed in the housing 100, an internal thread is formed in the through hole, an external thread adapted to the internal thread is formed on the limiting portion 302, and the limiting portion 302 is in threaded connection with the through hole. And the rotation control part 301 and the limiting part 302 move downwards, and when the baffle 200 is in contact with the limiting part 302, the baffle 200 is limited by the limiting part 302 and stops rotating upwards, so that the position of the baffle 200 is locked and fixed. The limiting mechanism 300 of the utility model is contacted with the baffle 200 through the limiting part 302, thereby accurately controlling the movement stroke of the baffle 200, and has simple structure and easy manufacture. Of course, the position limiting mechanism 300 may have other position limiting structures as long as the position can be limited by the opening angle of the baffle 200.

As a preferred embodiment, the device further comprises an electric adjusting part, wherein the electric adjusting part is used for controlling and driving the limiting mechanism 300; alternatively, the device further comprises a manual adjusting part, wherein the manual adjusting part is at least partially exposed out of the shell 100 and is used for driving the limiting mechanism 300. The electric adjusting part can accurately control the limit of the limit mechanism 300 on the baffle 200, the automation degree is high, and the operation is convenient; or the manual adjusting part is arranged, the limit of the limit mechanism 300 on the baffle 200 can be freely controlled, and the flexibility is strong.

In a preferred embodiment, the premix chamber 105 includes a first premix chamber 106 and a second premix chamber 107, and a minimum cross-sectional area of the second premix chamber 107 is larger than a minimum cross-sectional area of the first premix chamber 106.

In the present embodiment, the minimum cross-sectional areas of the first premix chamber 106 and the second premix chamber 107 are not uniform, and the sizes of the two corresponding gas outlets are also not uniform. In practical application, under a certain adjusting ratio of the fan, for example, the adjusting ratio is 1: 5, calculating that the ratio of the minimum wind speed regulating value to the maximum wind speed regulating value of the fan is 1: and 5, the fully premixed load is in direct proportion to the cross-sectional area of the inlet air of the fully premixed load. If the minimum cross-sectional areas of the two premix chambers are the same, the maximum load value of each premix chamber is 10kW, the total maximum load value of the two premix chambers is 20kW, the total minimum load value of the two premix chambers is 10/5-2 kW, and the load regulation ratio is 20/2-10-1; if the minimum cross-sectional areas of the two premix chambers are not the same, the first premix chamber 106 is rated at a maximum load of 10kW and the second premix chamber 107 is rated at a maximum load of 20kW, i.e. the total maximum load of the two premix chambers is 30kW, the minimum load is 10/5-2 kW, and the load turndown ratio 30/2-15-to-1. Therefore, the cross section areas of the two premixing cavities are different, the maximum heat load adjusting range of the water heater can be further enlarged, the temperature adjusting range is improved, the product comfort is improved, and fuel gas is saved. Of course, in some embodiments, the minimum cross-sectional areas of the first premix chamber 106 and the second premix chamber 107 may be the same, and the sizes of the two corresponding gas outlets are the same, which facilitates simple production and prevents errors.

In a preferred embodiment, first premix chamber 106 and second premix chamber 107 are each a venturi passage. The Venturi channel is characterized in that the two ends are wide, the middle is narrow, the flow rate of air can be increased through the Venturi channel, negative pressure adsorption is generated on the fuel gas in the fuel gas channel 104, and the mixing of the fuel gas and the air is promoted; when air respectively passes through the first premixing cavity 106 and the second premixing cavity 107, because the first premixing cavity 106 and the second premixing cavity 107 are in a Venturi channel structure, flowing air can generate negative pressure in a throat of the cavity, the negative pressure can enable gas to enter the premixing cavity, then the gas and the air can be mixed more uniformly in the premixing cavity, and then mixed gas is sent into a burner of a water heater to be fully combusted. 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 a preferred embodiment, a first baffle plate 201 is hinged in the first premixing chamber 106, a second baffle plate 202 is hinged in the second premixing chamber 107, and the driving force of the first baffle plate 201 is smaller than that of the second baffle plate 202.

In a preferred embodiment, the limiting mechanism 300 is disposed in the first premix chamber 106, and the limiting mechanism 300 is used for limiting the opening angle of the first flap 201.

In the utility model, the driven acting force is equivalent to the opening force of the baffle 200, and the two baffles 200 with inconsistent driven acting forces have inconsistent opening degrees under the suction force of the fan with the same rotating speed, so that the regulation range of the heat load of the product can be improved, the regulation temperature range can be improved, the product comfort can be improved, and particularly in products with large load. In this embodiment, when the wind volume is small, only the first baffle 201 of the first premixing chamber 106 is blown open, and when the wind volume is large to a certain extent, the first baffle 202 of the second premixing chamber 107 is blown open together, so that the staged air intake combustion can be formed, the adjustment range of the thermal load of the product can be increased, the range of the adjustment temperature can be increased, and the comfort of the product can be improved, especially in the case of a large-load product.

In a preferred embodiment, an adjusting screw 400 is disposed in the gas channel 104, and the adjusting screw 400 is used for adjusting the minimum flow area of the gas channel 104. The minimum flow area of the gas channel 104 is adjusted through the adjusting screw 400, so that on one hand, the gas quantity is adjustable, the mixing proportion of gas and air is guaranteed to reach the optimal state, and the stability and the adaptability of combustion are improved.

In a preferred embodiment, a safety cover for sealing the gas outlet of the gas channel 104 is further disposed in the premix chamber 105. When the baffle 200 is not opened, the gas outlet of the gas channel 104 is sealed by the safety cover, so that the gas channel cannot discharge the gas, the risk of directly discharging the gas due to misoperation or failure of the gas valve is avoided, and the safety of the product is improved. The safety cover of this embodiment also utilizes the gravity of self to plug up gas channel 104, and in a similar way, because in the time of work, baffle 200 and safety cover all receive the effect of the fan of water heater for the safety cover can upwards overturn and open.

In the detailed description of the embodiments, various technical features may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The detailed description of the embodiments above only expresses several embodiments of the present invention, and the description is specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent should be subject to the appended claims.

Claims

1. A premixer structure, comprising:

the air conditioner comprises a shell (100), wherein a premixing cavity (105) is arranged in the shell (100), and the premixing cavity (105) comprises an air outlet passage;

a gas channel (104), the gas channel (104) being in communication with the premix chamber (105);

a baffle (200), wherein the baffle (200) is hinged in the shell (100), and the baffle (200) is used for adjusting the opening degree of the air outlet passage;

and the limiting mechanism (300) is used for limiting the opening angle of the baffle (200).

2. The premixer structure according to claim 1, wherein the limiting mechanism (300) comprises a control part (301) and a limiting part (302), the control part (301) is movably connected with the casing (100), the limiting part (302) is at least partially located in the premixing cavity (105) and can be abutted against the baffle (200), and the control part (301) rotates to drive the depth of the limiting part (302) in the premixing cavity (105) so as to limit the opening angle of the baffle (200).

3. The premixer structure according to claim 2, wherein the casing (100) is provided with a through hole communicated with the premixing chamber (105), the through hole is provided with an internal thread, the limiting portion (302) is provided with an external thread matched with the internal thread, and the limiting portion (302) is in threaded connection with the through hole.

4. The premixer structure according to claim 1, further comprising an electric adjustment portion for controlled driving of the limiting mechanism (300); or, further comprising a manual adjustment portion, at least partially emerging outside the housing (100), for driving the stop mechanism (300).

5. The premixer structure according to claim 1, wherein the premix chamber (105) comprises a first premix chamber (106) and a second premix chamber (107), the minimum cross-sectional area of the second premix chamber (107) being larger than the minimum cross-sectional area of the first premix chamber (106).

6. The premixer structure according to claim 5, wherein the first premix chamber (106) and the second premix chamber (107) are each venturi passages.

7. The premixer structure according to claim 5, wherein a first baffle (201) is hinged in the first premixing chamber (106) (105), and a second baffle (202) is hinged in the second premixing chamber (107), and the driving force of the first baffle (201) is smaller than that of the second baffle (202).

8. The premixer structure according to claim 7, wherein the limiting mechanism (300) is provided in the first premixing chamber (106), and the limiting mechanism (300) is used for limiting the opening angle of the first baffle (201).

9. The premixer structure according to claim 1, wherein an adjusting screw (400) is provided in the gas passage (104), the adjusting screw (400) being used for adjusting a minimum flow area of the gas passage (104).

10. The premixer structure according to claim 1, wherein a safety cover for sealing a gas outlet of the gas passage (104) is further provided in the premixing chamber (105).