CN111434987A

CN111434987A - Venturi premixer and combustion apparatus

Info

Publication number: CN111434987A
Application number: CN201910034297.6A
Authority: CN
Inventors: 陆祖安; 梁国荣; 刘胜; 代先锋
Original assignee: Wuhu Midea Kitchen and Bath Appliances Manufacturing Co Ltd
Current assignee: Wuhu Midea Kitchen and Bath Appliances Manufacturing Co Ltd
Priority date: 2019-01-15
Filing date: 2019-01-15
Publication date: 2020-07-21

Abstract

The invention discloses a Venturi premixer and a combustion device, comprising: a casing having an inflow port, an outflow port, and an injection port, the casing defining therein a contracted flow path, an intake flow path, and an expanded flow path that are sequentially communicated from the inflow port to the outflow port, the contracted flow path having a flow area that decreases from the inflow port to the outflow port and the expanded flow path having a flow area that increases from the inflow port to the outflow port, the injection port and the intake flow path being provided with a through control port therebetween; the elastic adjusting piece is arranged on the shell and can move between a first position and a second position, the elastic adjusting piece extends into the suction flow channel to shield the control port when in the first position, and the elastic adjusting piece is positioned in the expansion flow channel to open the control port when in the second position. According to the Venturi premixer, a larger adjusting ratio can be realized, and larger load and smaller load can be automatically adapted.

Description

Venturi premixer and combustion apparatus

Technical Field

The invention relates to the technical field of combustion equipment, in particular to a venturi premixer and combustion equipment with the same.

Background

In the related art, a fully premixed combustion system (e.g., a heating stove or a water heater) is generally classified into two types according to a mixing manner of air and gas, one type is a pneumatic type in which gas is injected by air, and the other type is an electric type in which air volume and gas volume are respectively controlled by electronic equipment to be mixed and combusted in a cavity.

The fully premixed gas water heater or the wall-hanging stove requires low emission, but in areas with large difference of gas sources such as China and Europe, when the gas source has large difference with the standard gas, the emission is easy to rise sharply. At present, a pneumatic type full-premixing combustion system cannot solve the problem of gas self-adaptation, and can only rely on debugging to ensure that the emission of boundary gas is within an acceptable range.

Specifically, the pneumatic full premix combustion system must be provided with a venturi premixer, air and gas are mixed in the venturi, and the pressure at the gas nozzle is 0 when the fan does not work, so that the risk of gas leakage is avoided under the conditions of fan failure and abnormal air supply. For the double-venturi premixer, the throat part can be divided into two halves, one half is normally open (suitable for the working condition with smaller load), the other half is controllably opened and closed (suitable for the working condition with larger load), and two sets of gas nozzles are correspondingly configured.

Due to the limitations of the nozzle and venturi, the change in air-fuel ratio is small and the air-fuel ratio cannot be changed in time to accommodate the new air supply when the air supply changes, for example, the turn-down ratio (i.e., the minimum load to maximum load ratio) of a single venturi premixer is typically 1:5 and the turn-down ratio of a dual venturi premixer is 1: 10. Therefore, the water heater and the wall-hanging stove with the gas self-adaptive function based on the pneumatic full-premixing system are not available in the related art.

The electric full-premixing combustion system does not need a venturi, and the rotating speed of the fan and the opening and closing of the gas valve are respectively controlled according to the preset air-fuel ratio, so that specific amount of air and gas are fed into the premixing cavity to be mixed. Through the monitoring to the burning condition, can real time control air and gas volume, consequently, can realize gas self-adaptation. However, because the gas is supplied actively, the leakage of the gas cannot be prevented if the fan fails, and more protective measures are needed to ensure safety.

Disclosure of Invention

The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention provides the Venturi premixer which has a large adjusting ratio and strong self-adaptive capacity.

The invention also provides a combustion device with the Venturi premixer.

A venturi premixer in accordance with an embodiment of the first aspect of the present invention comprises: a casing having an inflow port, an outflow port, and an injection port, the casing defining therein a contracted flow path, an intake flow path, and an expanded flow path that are sequentially communicated from the inflow port to the outflow port, the contracted flow path having a flow area that decreases from the inflow port to the outflow port and the expanded flow path having a flow area that increases from the inflow port to the outflow port, the injection port and the intake flow path being provided with a through control port therebetween; the elastic adjusting piece is arranged on the shell and can move between a first position and a second position, the elastic adjusting piece extends into the suction flow channel to shield the control port when in the first position, and the elastic adjusting piece is positioned in the expansion flow channel to open the control port when in the second position.

According to the Venturi premixer provided by the embodiment of the invention, the air flow rate can be maintained in a certain range by adjusting the sizes of the air flow channel and the fuel gas flow channel through the elastic adjusting piece, so that a larger adjusting ratio is realized, and the Venturi premixer can automatically adapt to larger load and smaller load.

In addition, the venturi premixer according to the embodiment of the present invention has the following additional technical features:

according to some embodiments of the invention, the resilient adjustment member comprises: an adjustment block movable between the first position and the second position; and the elastic piece is respectively connected with the adjusting block and the shell and has a force for driving the adjusting block to the first position.

Further, the elastic adjustment member further includes: the fixing seat is installed on the shell and located at the flow outlet, and the elastic piece is connected with the adjusting block and the fixing seat respectively.

Optionally, the one end of fixing base towards the inflow entrance is equipped with the guide post, the regulating block cover is established in order to follow on the guide post is portable.

Advantageously, the adjusting block defines a receiving cavity, a side of the receiving cavity facing the outflow opening is open, the guide post extends out of a side of the receiving cavity facing the inflow opening, and the elastic member is disposed in the receiving cavity.

Optionally, when the elastic adjusting piece is in the second position, the fixed seat is located in the accommodating cavity.

Optionally, the accommodating cavity is provided with a first matching portion, the fixing seat is provided with a second matching portion, and the elastic piece is sleeved on the guide column and is connected with the first matching portion and the second matching portion respectively.

According to some embodiments of the invention, the control port is plural, the plural control ports are arranged at intervals along a circumferential direction of the suction flow passage, when the elastic adjusting member is in the first position, an outer circumferential wall of the elastic adjusting member blocks a part of the plural control ports and is spaced apart from the rest of the plural control ports, and when the elastic adjusting member is in the second position, the plural control ports are opened.

According to some embodiments of the invention, the outer peripheral wall of the elastic adjusting member is provided with an elastic stop, and the elastic stop blocks the control opening when the elastic adjusting member is in the first position.

According to some embodiments of the invention, the housing comprises: the spraying opening is formed in the shell; the inner shell is arranged in the outer shell, the inflow port, the outflow port, the control port, the reduction flow channel, the suction flow channel and the expansion flow channel are arranged on the inner shell, gaps are formed between the outer shell and the inner shell and between the injection port and the control port, and the elastic adjusting piece is installed on the inner shell.

The combustion apparatus according to the embodiment of the second aspect of the present invention comprises the venturi premixer according to the embodiment of the first aspect of the present invention.

According to the combustion equipment provided by the embodiment of the invention, the Venturi premixer can be used for automatically adapting to larger load and smaller load.

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

FIG. 1 is a perspective view of a venturi premixer according to an embodiment of the present invention;

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

FIG. 3 is a cross-sectional view taken along line A-A of FIG. 2;

FIG. 4 is a cross-sectional view taken along line B-B of FIG. 2;

FIG. 5 is a cross-sectional view of a venturi premixer according to an embodiment of the present invention.

Reference numerals:

a Venturi premixer 10,

Casing 100, inflow port 101, outflow port 102, injection port 103, reduced flow path 104, intake flow path 105, expansion flow path 106, nozzle 107, outer casing 110, inner casing 120, and,

The elastic adjusting element 200, the adjusting block 210, the accommodating cavity 211, the first matching part 212, the elastic blocking sheet 213, the elastic element 220, the fixing seat 230, the guide post 231 and the second matching part 232.

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 or similar 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 accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.

A venturi premixer 10 according to an embodiment of the first aspect of the present invention will be described with reference to the accompanying drawings.

As shown in FIGS. 1-5, a venturi premixer 10 according to an embodiment of the present invention comprises: a housing 100 and an elastic adjustment member 200.

Specifically, the casing 100 has an inlet 101, an outlet 102, and an injection port 103, and the inlet 101 and the outlet 102 are provided along the axial direction of the casing 100, and the injection port 103 is provided on the peripheral wall of the casing 100, for example. The casing 100 defines therein a narrowing flow passage 104, a suction flow passage 105, and an expanding flow passage 106 that are in communication in order from the inflow port 101 to the outflow port 102. The flow area of the narrowing flow path 104 gradually decreases from the inlet 101 to the outlet 102 and the flow area of the widening flow path 106 gradually increases from the inlet 101 to the outlet 102, a control port penetrating through the inlet 103 and the inlet 105 is provided, and a nozzle 107 is provided at the control port. Air enters the reduced flow path 104 through the inlet 101 and forms a negative pressure in the intake flow path 105, thereby ejecting gas from the nozzle 107, and the air and the gas are mixed in the expanded flow path 106.

The elastic adjustment member 200 is provided to the housing 100. The resilient adjustment member 200 is movable between a first position, shown in fig. 3, and a second position, shown in fig. 5. When the elastic adjusting piece 200 is at the first position, the elastic adjusting piece extends into the suction flow channel 105 to shield the control opening, and at the moment, the elastic adjusting piece adapts to the working condition with smaller load; the resilient adjustment member 200 is positioned in the expansion channel 106 in the second position to open the control port, which accommodates higher loading conditions. Here, the elastic adjustment member 200 blocks the control port, including the elastic adjustment member 200 blocking the entire nozzle 107 and only a part of the nozzle 107 for one nozzle 107; the elastic regulation member 200 opens the control opening, which means that the elastic regulation member 200 fully opens the nozzle 107, i.e., the elastic regulation member 200 does not shield the nozzle 107.

Thus, according to the venturi premixer 10 of the embodiment of the present invention, the sizes of the air flow passage and the fuel gas flow passage are adjusted by the elastic adjusting member 200, and the air flow rate can be maintained within a certain range regardless of a large load or a small load, thereby realizing a large adjustment ratio and automatically adapting to a large load and a small load.

According to some embodiments of the present invention, as shown in fig. 1-5, the elastic adjustment member 200 includes: an adjustment block 210 and an elastic member 220. The adjustment block 210 is movable between a first position and a second position in the axial direction of the housing 100. The elastic member 220 is connected to the adjustment block 210 and the housing 100, respectively, and the elastic member 220 has a force to normally urge the adjustment block 210 to the first position. Thus, when the load is small, the adjusting block 210 can block part of the flow channel under the force of the elastic member 220; when the load is large, the adjusting block 210 is blown toward the outlet port 102, so that the flow area of the suction flow passage 105 increases. For example, the elastic member 220 is a spring, so that it can be automatically restored by the elastic force of the spring, and has a simple structure and no limitation on the installation direction.

Further, as shown in fig. 3 to 5, the elastic adjustment member 200 further includes: the fixing seat 230, the fixing seat 230 is installed in the casing 100, the fixing seat 230 is located at the outflow port 102, and the elastic member 220 is connected with the adjusting block 210 and the fixing seat 230, respectively, so that the installation is convenient and firm.

Optionally, as shown in fig. 3-5, one end of the fixing seat 230 facing the inflow port 101 is provided with a guide post 231, and the adjusting block 210 is sleeved on the guide post 231 to be movable along the guide post 231, so that the movement of the adjusting block 210 is smooth and reliable.

Advantageously, as shown in fig. 3-5, the adjusting block 210 defines a containing cavity 211 therein, a side of the containing cavity 211 facing the outflow port 102 is open, the guide post 231 extends out of the side of the containing cavity 211 facing the inflow port 101, and the elastic member 220 is disposed in the containing cavity 211, so that the structure is compact and the guidance performance is good.

Optionally, as shown in fig. 5, when the elastic adjusting member 200 is in the second position, the fixing seat 230 is located in the accommodating cavity 211, that is, the adjusting block 210 covers the fixing seat 230, so that space is saved and structural reliability is high.

Optionally, as shown in fig. 3 to 5, a first engaging portion 212 is disposed in the accommodating cavity 211, a second engaging portion 232 is disposed on the fixing base 230, the elastic member 220 is sleeved on the guiding post 231, and the elastic member 220 is connected to the first engaging portion 212 and the second engaging portion 232 respectively, so that the connection is firm and the movement is more stable. For example, the first and second

fitting portions

212 and 232 are bosses, respectively, so as to improve the stability of the elastic member 220.

According to some embodiments of the present invention, as shown in fig. 3 to 5, the control port is plural, and the plural control ports are arranged at intervals in the circumferential direction of the suction flow channel 105. When the resilient adjustment member 200 is in the first position, as shown in FIG. 3, the peripheral wall of the adjustment block 210 blocks a portion of the plurality of control ports, and, as shown in FIG. 4, the adjustment block 210 is spaced apart from the remainder of the plurality of control ports. The resilient adjustment member 200 opens the plurality of control ports when in the second position.

Here, the outer peripheral wall of the regulating block 210 blocks a part of the plurality of control ports, including both the case where the outer peripheral wall of the regulating block 210 blocks a part of the plurality of nozzles 107 and the case where the outer peripheral wall of the regulating block 210 blocks a part of each of the plurality of nozzles 107. For example, when the resilient adjustment member 200 is in the first position, the nozzle 107 at each control port is facing the adjustment block 210.

According to some embodiments of the present invention, as shown in fig. 3 and 4, the outer peripheral wall of the adjusting block 210 is provided with a resilient flap 213, and the resilient flap 213 blocks the nozzle 107 when the resilient adjusting member 200 is in the first position. For example, when there are a plurality of nozzles 107, the elastic flap 213 blocks two nozzles 107 disposed opposite to each other in the radial direction of the housing 100 when the elastic adjusting member 200 is in the first position, and the remaining nozzles 107 are spaced apart from the elastic flap 213.

According to some embodiments of the present invention, as shown in fig. 3-5, the housing 100 includes: an outer shell 110 and an inner shell 120. The injection port 103 is provided in the housing 110. The inner casing 120 is arranged in the outer casing 110, the inflow port 101, the outflow port 102, the control port, the narrowing flow passage 104, the suction flow passage 105 and the expanding flow passage 106 are arranged on the inner casing 120, a gap is formed between the injection port 103 and the control port of the outer casing 110 and the inner casing 120, and the fixing base 230 is mounted on the inner casing 120.

The combustion apparatus according to the second aspect of the embodiment of the present invention comprises the venturi premixer 10 according to the first aspect of the present invention. For example, the combustion device is a gas water heater or a wall-hanging stove.

The combustion apparatus according to the embodiment of the present invention can automatically accommodate a large load and a small load using the venturi premixer 10 as described above.

It is understood that the venturi premixer 10 may be installed upstream of the fan.

Other constructions and operations of the combustion apparatus according to the embodiments of the invention are known to those skilled in the art and will not be described in detail herein.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the 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 otherwise specified.

In the description of the present invention, "a first feature" or "a second feature" may include one or more of the features, and the first feature "on" or "under" the second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact with each other through another feature therebetween. The first feature being "on," "over" and "above" 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.

It should be noted that, in the description of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as being fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; either directly or indirectly through intervening media, or through the communication between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "a specific embodiment," "an example" or "some examples" or the like are intended to 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.

While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A venturi premixer, comprising:

a casing having an inflow port, an outflow port, and an injection port, the casing defining therein a contracted flow path, an intake flow path, and an expanded flow path that are sequentially communicated from the inflow port to the outflow port, the contracted flow path having a flow area that decreases from the inflow port to the outflow port and the expanded flow path having a flow area that increases from the inflow port to the outflow port, the injection port and the intake flow path being provided with a through control port therebetween;

the elastic adjusting piece is arranged on the shell and can move between a first position and a second position, the elastic adjusting piece extends into the suction flow channel to shield the control port when in the first position, and the elastic adjusting piece is positioned in the expansion flow channel to open the control port when in the second position.

2. The venturi premixer of claim 1, wherein the resilient adjustment member comprises:

an adjustment block movable between the first position and the second position;

and the elastic piece is respectively connected with the adjusting block and the shell and has a force for driving the adjusting block to the first position.

3. The venturi premixer of claim 2, wherein the resilient adjustment member further comprises:

the fixing seat is installed on the shell and located at the flow outlet, and the elastic piece is connected with the adjusting block and the fixing seat respectively.

4. The venturi premixer according to claim 3, wherein a guide post is provided at an end of the fixing base facing the inflow port, and the adjusting block is fitted over the guide post so as to be movable along the guide post.

5. The venturi premixer of claim 4, wherein the adjusting block defines a receiving chamber, a side of the receiving chamber facing the outflow port is open, the guide post protrudes out of a side of the receiving chamber facing the inflow port, and the elastic member is provided in the receiving chamber.

6. The venturi premixer of claim 5, wherein the fixed seat is located in the receiving chamber when the resilient adjustment member is in the second position.

7. The venturi premixer of claim 5, wherein a first engaging portion is disposed in the accommodating chamber and a second engaging portion is disposed in the fixing seat, and the elastic member is sleeved on the guide post and connected to the first engaging portion and the second engaging portion, respectively.

8. The venturi premixer of claim 1, wherein the plurality of control ports are spaced circumferentially along the suction flow passage, the outer peripheral wall of the resilient adjuster blocks a portion of the plurality of control ports and is spaced apart from the remainder of the plurality of control ports when the resilient adjuster is in the first position, and the resilient adjuster opens the plurality of control ports when in the second position.

9. The venturi premixer of claim 1, wherein the peripheral wall of the resilient adjusting member is provided with a resilient flap, the resilient flap blocking the control port when the resilient adjusting member is in the first position.

10. The venturi premixer of any one of claims 1-9, wherein the housing comprises:

the spraying opening is formed in the shell;

the inner shell is arranged in the outer shell, the inflow port, the outflow port, the control port, the reduction flow channel, the suction flow channel and the expansion flow channel are arranged on the inner shell, gaps are formed between the outer shell and the inner shell and between the injection port and the control port, and the elastic adjusting piece is installed on the inner shell.

11. A combustion apparatus comprising a venturi premixer according to any one of claims 1-10.