CN111434987A - Venturi Premixer and Combustion Equipment - Google Patents

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 Equipment

technical field

The present invention relates to the technical field of combustion equipment, in particular, to a Venturi premixer and a combustion equipment having the Venturi premixer.

Background technique

In the related art, the full premixed combustion system (for example, a heating furnace or a water heater) is usually divided into two types according to the way of mixing air and gas. Electric type that controls the amount of air and gas to mix and burn in the chamber.

Fully premixed gas water heaters or wall-hung boilers require low emissions, but in regions with large differences in gas sources such as China and Europe, when the gas source and the standard gas composition differ greatly, it is easy to cause a sharp increase in emissions. At present, the pneumatic full premixed 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 premixed combustion system must be equipped with a Venturi premixer. The air and gas are mixed in the Venturi. When the fan is not working, the pressure at the gas nozzle is 0. Therefore, when the fan fails and the air supply is abnormal There is no danger of gas leaks. For a double venturi premixer, the throat is divided in half, one half is normally open (for lighter loads) and the other half is controlled open and close (for heavier loads), and Two sets of gas nozzles are correspondingly configured.

Due to the limitation of the nozzle and the venturi, the change of the air-fuel ratio is very small, and the air-fuel ratio cannot be changed in time to adapt to the new air source when the air source changes. duty ratio) is usually 1:5, and the turndown ratio of the double venturi premixer is 1:10. Therefore, there is no water heater and wall-hung boiler with a gas adaptive function based on a pneumatic full premix system in the related art.

The electric full premixed combustion system does not require a venturi, and controls the fan speed and the gas valve opening and closing respectively according to the preset air-fuel ratio, so as to send a specific amount of air and gas into the premixing chamber for mixing. By monitoring the combustion situation, the air and gas volume can be controlled in real time, therefore, the gas self-adaptation can be realized. However, due to the active supply of gas, if the fan fails, it cannot prevent the leakage of gas, and more protection measures are required to ensure safety.

SUMMARY OF THE INVENTION

The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes a Venturi premixer, which has a large adjustment ratio and strong adaptive ability.

The present invention also provides a combustion device with the venturi premixer.

A Venturi premixer according to an embodiment of the first aspect of the present invention includes: a casing, the casing has an inflow port, an outflow port and a spray port, and the casing defines a flow from the inflow port to the outflow port A reduced flow channel, a suction flow channel, and an expanded flow channel communicated in sequence, the flow area of the reduced flow channel decreases from the inflow port to the outflow port and the flow area of the expansion flow channel decreases from the inflow port When the outflow port increases, a through control port is provided between the injection port and the suction flow channel; an elastic adjustment member is provided on the housing and is located at the first position and the second position. The elastic adjustment piece is movable between positions, the elastic adjustment piece extends into the suction flow passage to block the control port when the first position is, and the elastic adjustment piece is located in the expansion flow passage at the second position to open the control port.

According to the Venturi premixer of the embodiment of the present invention, the size of the air flow channel and the gas flow channel can be adjusted by the elastic adjustment member, and the air flow rate can be maintained within a certain range, thereby realizing a larger adjustment ratio and automatically adapting to larger loads. and smaller loads.

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

According to some embodiments of the present invention, the elastic adjustment member includes: an adjustment block, the adjustment block is movable between the first position and the second position; an elastic member, the elastic member is respectively connected with the An adjustment block is connected to the housing and has a force that constantly drives the adjustment block toward the first position.

Further, the elastic adjustment member further comprises: a fixing seat, the fixing seat is mounted on the casing and located at the outflow port, and the elastic member is respectively connected with the adjustment block and the fixing seat.

Optionally, one end of the fixing base facing the inflow port is provided with a guide post, and the adjusting block is sleeved on the guide post to be movable along the guide post.

Advantageously, an accommodating cavity is defined in the adjustment block, the side of the accommodating cavity facing the outflow port is open, the guide post protrudes from the side of the accommodating cavity facing the inflow port, the The elastic piece is arranged in the accommodating cavity.

Optionally, when the elastic adjusting member is in the second position, the fixing seat is located in the accommodating cavity.

Optionally, the accommodating cavity is provided with a first matching portion and the fixing base is provided with a second matching portion, and the elastic member is sleeved on the guide post and is respectively connected with the first matching portion and the second matching portion. The second matching portion is connected.

According to some embodiments of the present invention, there are a plurality of the control ports, and the plurality of the control ports are arranged at intervals along the circumferential direction of the suction flow channel, and when the elastic adjustment member is in the first position, the elastic The outer peripheral wall of the adjusting member blocks a part of the plurality of control ports and is spaced apart from the rest of the plurality of control ports, and the elastic adjusting member opens the plurality of control ports when in the second position.

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

According to some embodiments of the present invention, the housing comprises: an outer shell, the injection port is provided on the outer shell; an inner shell, the inner shell is provided 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, and the outer shell and the inner shell are located at the injection port and the control port The part therebetween has a gap, and the elastic adjustment member is mounted on the inner shell.

The combustion apparatus according to the embodiment of the second aspect of the present invention includes the Venturi premixer according to the embodiment of the first aspect of the present invention.

The combustion apparatus according to the embodiment of the present invention can automatically adapt to the larger load and the smaller load by using the Venturi premixer as described above.

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

Description of drawings

1 is a perspective view of a Venturi premixer according to an embodiment of the present invention;

2 is a schematic structural diagram of a Venturi premixer according to an embodiment of the present invention;

Fig. 3 is a sectional view along line A-A in Fig. 2;

Fig. 4 is a sectional view along line B-B in Fig. 2;

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

Reference number:

Venturi Premixer 10,

Housing 100, inflow port 101, outflow port 102, injection port 103, reduction flow channel 104, suction flow channel 105, expansion flow channel 106, nozzle 107, outer shell 110, inner shell 120,

The elastic adjustment member 200 , the adjustment block 210 , the accommodating cavity 211 , the first matching portion 212 , the elastic blocking piece 213 , the elastic member 220 , the fixing seat 230 , the guide post 231 , and the second matching portion 232 .

Detailed ways

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

The Venturi premixer 10 according to the embodiment of the first aspect of the present invention will be described below with reference to the accompanying drawings.

As shown in FIGS. 1-5 , the Venturi premixer 10 according to an embodiment of the present invention includes: a casing 100 and an elastic adjusting member 200 .

Specifically, the housing 100 has an inflow port 101 , an outflow port 102 and an injection port 103 . The housing 100 defines a reduction flow channel 104 , a suction flow channel 105 and an expansion flow channel 106 which are sequentially communicated from the inflow port 101 to the outflow port 102 . The flow area of the reduced flow channel 104 gradually decreases from the inflow port 101 to the outflow port 102 and the flow area of the expanded flow channel 106 gradually increases from the inflow port 101 to the outflow port 102 . The through control port is provided with a nozzle 107 at the control port. The air enters the reduced flow channel 104 through the inflow port 101 , and forms a negative pressure in the suction flow channel 105 , so that the gas is ejected from the nozzle 107 , and the air and the gas are mixed in the expansion flow channel 106 .

The elastic adjustment member 200 is disposed on the casing 100 . The elastic adjustment member 200 is movable between a first position shown in FIG. 3 and a second position shown in FIG. 5 . In the first position, the elastic adjustment member 200 extends into the suction channel 105 to block the control port. At this time, it adapts to the working condition with less load; in the second position, the elastic adjustment member 200 is located in the expansion flow channel 106 to open the control port. , at this time, it is suitable for the working condition with large load. Here, the elastic adjustment member 200 covers the control port. For one nozzle 107, the elastic adjustment member 200 covers the entire nozzle 107 and only a part of the nozzle 107; the elastic adjustment member 200 opens the control port, which means that the elastic adjustment member 200 completely The nozzle 107 is opened, that is, the elastic adjustment member 200 does not block the nozzle 107 .

Therefore, according to the Venturi premixer 10 according to the embodiment of the present invention, the size of the air flow channel and the gas flow channel can be adjusted by the elastic adjustment member 200, and the air flow rate can be maintained at a certain level regardless of whether the load is large or the load is small. within the range, so as to achieve a larger adjustment ratio and automatically adapt to larger loads and smaller loads.

According to some embodiments of the present invention, as shown in FIGS. 1 to 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 along the axial direction of the housing 100 . The elastic pieces 220 are respectively connected with the adjustment block 210 and the housing 100 , and the elastic pieces 220 have a force that drives the adjustment block 210 to the first position. In this way, when the load is small, the adjusting block 210 can block part of the flow passage under the force of the elastic member 220; when the load is large, the adjusting block 210 is blown toward the outflow port 102, so that the flow area of the suction passage 105 is increased. For example, the elastic member 220 is a spring, so that it can be automatically reset by the elastic force of the spring, the structure is simple, and the installation direction is not limited.

Further, as shown in FIGS. 3-5 , the elastic adjusting member 200 further includes: a fixing base 230 , the fixing base 230 is mounted on the housing 100 , the fixing base 230 is located at the outflow port 102 , and the elastic member 220 is connected to the adjusting block 210 and the adjusting block 210 respectively. The fixing bases 230 are connected, so that the installation is convenient and firm.

Optionally, as shown in FIG. 3 to FIG. 5 , a guide post 231 is provided at one end of the fixing base 230 facing the inflow port 101 , and the adjusting block 210 is sleeved on the guide post 231 to be movable along the guide post 231 , thereby adjusting the block The 210 moves smoothly and reliably.

Advantageously, as shown in FIGS. 3-5 , the adjusting block 210 defines an accommodation cavity 211 , the side of the accommodation cavity 211 facing the outflow port 102 is open, and the guide post 231 protrudes from a side of the accommodation cavity 211 toward the inflow port 101 . On the other hand, the elastic member 220 is arranged in the accommodating cavity 211, so that the structure is relatively compact and the guiding property 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 , thereby saving space and having high structural reliability.

Optionally, as shown in FIG. 3 to FIG. 5 , the accommodating cavity 211 is provided with a first matching portion 212 and the fixing seat 230 is provided with a second matching portion 232 , the elastic member 220 is sleeved on the guide post 231 , and the elastic member 220 They are respectively connected with the first matching portion 212 and the second matching portion 232, so that the connection is firm and the movement is more stable. For example, the first matching portion 212 and the second matching portion 232 are respectively bosses, so as to improve the stability of the elastic member 220 .

According to some embodiments of the present invention, as shown in FIGS. 3-5 , there are multiple control ports, and the multiple control ports are arranged at intervals along the circumferential direction of the suction flow channel 105 . When the elastic adjusting member 200 is in the first position, as shown in FIG. 3 , the peripheral wall of the adjusting block 210 blocks a part of the plurality of control ports, and, as shown in FIG. 4 , the adjusting block 210 and the rest of the plurality of control ports spaced apart. The elastic adjustment member 200 opens a plurality of control ports when in the second position.

Here, the peripheral wall of the adjusting block 210 blocks a part of the plurality of control ports, including the peripheral wall of the adjusting block 210 blocking part of the nozzles 107 and the peripheral wall of the adjusting block 210 blocking a part of each nozzle 107 of the plurality of nozzles 107 both cases. For example, when the elastic adjusting member 200 is in the first position, the nozzles 107 at each control port are facing the adjusting block 210 .

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

According to some embodiments of the present invention, as shown in FIGS. 3-5 , the housing 100 includes: an outer shell 110 and an inner shell 120 . The injection port 103 is provided in the casing 110 . The inner shell 120 is arranged in the outer shell 110, and the inflow port 101, the outflow port 102, the control port, the reducing flow channel 104, the suction flow channel 105 and the expansion flow channel 106 are arranged on the inner shell 120. The part between the inlet 103 and the control port has a gap, and the fixing seat 230 is installed on the inner shell 120, so that the structure is compact and the disassembly and assembly are convenient.

The combustion apparatus according to the embodiment of the second aspect of the present invention includes the Venturi premixer 10 according to the embodiment of the first aspect of the present invention. For example, the combustion equipment is a gas water heater and a wall-hung boiler.

The combustion apparatus according to the embodiment of the present invention, using the Venturi premixer 10 as described above, can automatically adapt to larger loads and smaller loads.

It will be appreciated that the venturi premixer 10 may be installed upstream of the blower.

Other structures and operations of the combustion apparatus according to the embodiments of the present invention are known to those of ordinary skill in the art and will not be described in detail here.

In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", " Back, Left, Right, Vertical, Horizontal, Top, Bottom, Inner, Outer, Clockwise, Counterclockwise, Axial , "radial", "circumferential" and other indicated orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying the indicated device or Elements must have a particular orientation, be constructed, and operate in a particular orientation and are therefore not to be construed as limitations of the invention.

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

In the description of the present invention, "first feature" and "second feature" may include one or more of the features, and the first feature "above" or "under" the second feature may include the first and second features The two features are in direct contact, and may also include that the first and second features are not in direct contact but are in contact through another feature between them. The first feature is "above", "over" and "above" the second feature includes the first feature being directly above and diagonally above the second feature, or simply means that the first feature is level higher than the second feature.

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

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

Although embodiments of the present 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 in these embodiments without departing from the principles and spirit of the invention, The scope of the invention is defined by the claims and their equivalents.

Claims (11)

1. a Venturi premixer, is characterized in that, comprises: a casing, the casing has an inflow port, an outflow port and an injection port, and a reduction flow channel, a suction flow channel and an expansion flow channel which are sequentially communicated from the inflow port to the outflow port are defined in the housing, so The flow area of the reduced flow channel decreases from the inflow port to the outflow port and the flow area of the expansion flow channel increases from the inflow port to the outflow port, the injection port and the suction flow There is a through control port between the roads; an elastic adjustment piece, the elastic adjustment piece is provided on the housing and is movable between a first position and a second position, and the elastic adjustment piece extends into the suction flow passage to cover the first position when the elastic adjustment piece is in the first position For the control port, the elastic adjustment member is located in the expansion flow channel to open the control port when the elastic adjustment member is in the second position. 2. The Venturi premixer according to claim 1, wherein the elastic adjustment member comprises: an adjustment block movable between the first position and the second position; The elastic pieces are respectively connected with the adjustment block and the housing and have a force to always drive the adjustment block to the first position. 3. The Venturi premixer according to claim 2, wherein the elastic adjustment member further comprises: and a fixing seat, the fixing seat is installed on the housing and located at the outflow port, and the elastic member is respectively connected with the adjusting block and the fixing seat. 4 . The Venturi premixer according to claim 3 , wherein one end of the fixing seat facing the inflow port is provided with a guide column, and the adjusting block is sleeved on the guide column to move along the guide column. 5 . The guide post is movable. 5 . The Venturi premixer according to claim 4 , wherein an accommodation cavity is defined in the adjustment block, a side of the accommodation cavity facing the outflow port is open, and the guide post protrudes out. 6 . On the side of the accommodating cavity facing the inflow port, the elastic member is provided in the accommodating cavity. 6 . The Venturi premixer according to claim 5 , wherein when the elastic adjusting member is in the second position, the fixing seat is located in the accommodating cavity. 7 . 7 . The Venturi premixer according to claim 5 , wherein the accommodating cavity is provided with a first matching portion, the fixing base is provided with a second matching portion, and the elastic member is sleeved on the The guide post is connected with the first matching part and the second matching part respectively. 8 . The Venturi premixer according to claim 1 , wherein there are a plurality of the control ports, the plurality of control ports are arranged at intervals along the circumferential direction of the suction flow channel, and the control ports are: 9 . A plurality of the control ports are arranged at intervals along the circumferential direction of the suction channel, and when the elastic adjustment member is in the first position, the outer peripheral wall of the elastic adjustment member blocks the plurality of control ports and spaced apart from the rest of the plurality of control ports, the elastic adjustment member opens the plurality of control ports when in the second position. 9 . The Venturi premixer according to claim 1 , wherein the outer peripheral wall of the elastic adjusting member is provided with an elastic blocking piece, and the elastic blocking piece is when the elastic adjusting member is in the first position. 10 . Block the control port. 10. The venturi premixer of any one of claims 1-9, wherein the housing comprises: a casing, the spray port is arranged on the casing; an inner shell, the inner shell is provided in the outer shell, the inflow port, the outflow port, the control port, the reducing flow channel, the suction flow channel and the expansion flow channel are provided in the On the inner shell, the outer shell and the inner shell have a gap between the injection port and the control port, and the elastic adjustment member is mounted on the inner shell. 11. A combustion apparatus, characterized by comprising a Venturi premixer according to any one of claims 1-10.

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