Venturi premixer and combustion equipment

Abstract

The present invention discloses a Venturi premixer and a combustion device, comprising: a housing having an inlet, an outlet and an injection port, wherein a reduced flow channel, a suction flow channel and an expansion flow channel that are sequentially communicated from the inlet to the outlet are defined in the housing, the flow area of the reduced flow channel decreases from the inlet to the outlet and the flow area of the expansion flow channel increases from the inlet to the outlet, and a through control port is provided between the injection port and the suction flow channel; an elastic adjusting member provided in the housing and movable between a first position and a second position, when the elastic adjusting member is in the first position, it extends into the suction flow channel to block the control port, and when the elastic adjusting member is in the second position, it is located in the expansion flow channel to open the control port. According to the Venturi premixer of the present invention, a large adjustment ratio can be achieved, and it can automatically adapt to large loads and small loads.

Description

Technical Field

[0001] The present invention relates to the technical field of combustion equipment, and more particularly, to a Venturi premixer and a combustion equipment having the Venturi premixer. Background Art

[0002] In related technologies, fully premixed combustion systems (such as heating furnaces or water heaters) are generally divided into two types according to the mixing method of air and gas. One is a pneumatic type that relies on air to eject gas, and the other is an electric type that separately controls the air volume and gas volume through electronic devices and then mixes and burns in a cavity.

[0003] Fully premixed gas water heaters or wall-mounted boilers require low emissions. However, in regions with large differences in gas sources such as China and Europe, when the gas source differs greatly from the standard gas composition, it is very easy to cause a sharp increase in emissions. At present, the pneumatic fully premixed combustion system cannot solve the gas adaptability problem and can only rely on debugging to ensure that the emissions of the boundary gas are within an acceptable range.

[0004] Specifically, the pneumatic fully premixed combustion system must be provided with a Venturi premixer. Air and gas are mixed within the Venturi. When the fan does not work, the pressure at the gas nozzle is 0. Therefore, there is no risk of gas leakage in the case of fan failure or abnormal air supply. For a double Venturi premixer, the throat will be divided into two halves, one half is always open (suitable for operating conditions with a smaller load), the other half is controllably opened and closed (suitable for operating conditions with a larger load), and two sets of gas nozzles are correspondingly configured.

[0005] Due to the limitations of the nozzle and the Venturi tube, the change in the air-fuel ratio is very small, and it is impossible to timely change the air-fuel ratio to adapt to the new gas source when the gas source changes. For example, the adjustment ratio (i.e., the ratio of the minimum load to the maximum load) of a single Venturi premixer is usually 1:5, and that of a double Venturi premixer is 1:10. Therefore, there are no water heaters and wall-mounted boilers with a gas adaptability function based on the pneumatic fully premixed system in related technologies.

[0006] The electric fully premixed combustion system does not require a Venturi. It separately controls the fan speed and the opening and closing of the gas valve according to a 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 volumes can be controlled in real time. Therefore, gas adaptability can be achieved. However, since the gas is supplied actively, if the fan fails, it is impossible to prevent gas leakage, and more protection measures are required to ensure safety. Summary of the Invention

[0007] The present invention aims to solve at least one of the technical problems existing in the prior art. For this purpose, the present invention provides a Venturi premixer, which has a large adjustment ratio and strong adaptability.

[0008] The present invention also provides a combustion device having the Venturi premixer described above.

[0009] The Venturi premixer according to the embodiment of the first aspect of the present invention includes: a housing having an inlet, an outlet, and an injection port. A reduced flow channel, a suction flow channel, and a diffuser flow channel that are sequentially connected from the inlet to the outlet are defined in the housing. The flow area of the reduced flow channel decreases from the inlet to the outlet, and the flow area of the diffuser flow channel increases from the inlet to the outlet. A through control port is provided between the injection port and the suction flow channel; an elastic adjusting member is provided in the housing and is movable between a first position and a second position. When the elastic adjusting member is in the first position, it extends into the suction flow channel to block the control port, and when the elastic adjusting member is in the second position, it is located in the diffuser flow channel to open the control port.

[0010] With the Venturi premixer according to the embodiment of the present invention, by adjusting the sizes of the air flow channel and the gas flow channel through the elastic adjusting member, the air flow velocity can be maintained within a certain range, thereby achieving a large adjustment ratio and automatically adapting to large loads and small loads.

[0011] In addition, the Venturi premixer according to the embodiment of the present invention further has the following additional technical features:

[0012] According to some embodiments of the present invention, the elastic adjusting member includes: an adjusting block that is movable between the first position and the second position; an elastic member that is respectively connected to the adjusting block and the housing and has a force that constantly drives the adjusting block towards the first position.

[0013] Further, the elastic adjusting member further includes: a fixing seat that is installed on the housing and is located at the outlet, and the elastic member is respectively connected to the adjusting block and the fixing seat.

[0014] Optionally, a guide post is provided at one end of the fixing seat facing the inlet, and the adjusting block is sleeved on the guide post to be movable along the guide post.

[0015] Advantageously, a receiving cavity is defined in the adjusting block, one side of the receiving cavity facing the outlet is open, the guide post extends out of the side of the receiving cavity facing the inlet, and the elastic member is arranged in the receiving cavity.

[0016] Optionally, when the elastic adjusting member is in the second position, the fixing seat is located in the receiving cavity.

[0017] Optionally, a first engaging portion is provided in the accommodating cavity, and a second engaging portion is provided on the fixing seat. The elastic member is sleeved on the guiding column and is respectively connected to the first engaging portion and the second engaging portion.

[0018] According to some embodiments of the present invention, there are a plurality of control ports, and the plurality of control ports are arranged at intervals along the circumferential direction of the suction flow channel. When the elastic adjusting member is in the first position, the outer peripheral wall of the elastic adjusting member blocks a part of the plurality of control ports and is spaced apart from the remaining part of the plurality of control ports. When the elastic adjusting member is in the second position, the plurality of control ports are opened.

[0019] According to some embodiments of the present invention, an elastic flap is provided on the outer peripheral wall of the elastic adjusting member, and the elastic flap blocks the control port when the elastic adjusting member is in the first position.

[0020] According to some embodiments of the present invention, the housing includes: an outer shell, and the spray inlet is provided on the outer shell; an inner shell, the inner shell is provided inside the outer shell, the flow inlet, the flow outlet, the control port, the reduced flow channel, the suction flow channel and the expansion flow channel are provided on the inner shell, and there is a gap between the parts of the outer shell and the inner shell located between the spray inlet and the control port, and the elastic adjusting member is installed on the inner shell.

[0021] The combustion device according to the second aspect embodiment of the present invention includes the Venturi premixer according to the first aspect embodiment of the present invention.

[0022] The combustion device according to the embodiment of the present invention, by using the Venturi premixer as described above, can automatically adapt to large loads and small loads.

[0023] The additional aspects and advantages of the present invention will be partly given in the following description, partly will become obvious from the following description, or will be understood through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a perspective view of a Venturi premixer according to an embodiment of the present invention;

[0025] Figure 2 is a schematic structural diagram of a Venturi premixer according to an embodiment of the present invention;

[0026] Figure 3 is a sectional view along Figure 2 line A-A in

[0027] Figure 4 is a sectional view along Figure 2 line B-B in

[0028] Figure 5It is a cross-sectional view of a Venturi premixer according to an embodiment of the present invention.

[0029] Reference numerals:

[0030] Venturi premixer 10,

[0031] Housing 100, inlet 101, outlet 102, injection port 103, reduced flow channel 104, suction flow channel 105, diffuser flow channel 106, nozzle 107, outer shell 110, inner shell 120,

[0032] Elastic adjusting member 200, adjusting block 210, accommodating cavity 211, first engaging portion 212, elastic retaining piece 213, elastic member 220, fixed seat 230, guide post 231, second engaging portion 232. Detailed implementation manners

[0033] The embodiments of the present invention will be described in detail below. Examples of the embodiments are shown in the drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are only used to explain the present invention and should not be construed as a limitation of the present invention.

[0034] The Venturi premixer 10 according to the first aspect embodiment of the present invention will be described below with reference to the drawings.

[0035] As Figures 1-5 shown, the Venturi premixer 10 according to the embodiment of the present invention includes: a housing 100 and an elastic adjusting member 200.

[0036] Specifically, the housing 100 has an inlet 101, an outlet 102, and an injection port 103. For example, the inlet 101 and the outlet 102 are arranged along the axial direction of the housing 100, and the injection port 103 is provided on the peripheral wall of the housing 100. A reduced flow channel 104, a suction flow channel 105, and a diffuser flow channel 106 that are sequentially communicated from the inlet 101 to the outlet 102 are defined inside the housing 100. The flow area of the reduced flow channel 104 gradually decreases from the inlet 101 to the outlet 102, and the flow area of the diffuser flow channel 106 gradually increases from the inlet 101 to the outlet 102. A through control port is provided between the injection port 103 and the suction flow channel 105, and a nozzle 107 is provided at the control port. Air enters the reduced flow channel 104 from the inlet 101, forms a negative pressure in the suction flow channel 105, thereby ejecting the fuel gas from the nozzle 107, and the air and the fuel gas are mixed in the diffuser flow channel 106.

[0037] The elastic adjusting member 200 is provided on the housing 100. The elastic adjusting member 200 is in Figure 3 the first position shown and Figure 5It is movable between the second positions shown. When the elastic adjusting member 200 is in the first position, it extends into the suction flow channel 105 to block the control port. At this time, it adapts to the working condition with a smaller load. When the elastic adjusting member 200 is in the second position, it is located in the expanding flow channel 106 to open the control port. At this time, it adapts to the working condition with a larger load. Here, when the elastic adjusting member 200 blocks the control port, for one nozzle 107, it includes the elastic adjusting member 200 blocking the entire nozzle 107 and only blocking a part of the nozzle 107. When the elastic adjusting member 200 opens the control port, it means that the elastic adjusting member 200 completely opens the nozzle 107, that is, the elastic adjusting member 200 does not block the nozzle 107.

[0038] Thus, for the Venturi premixer 10 according to the embodiment of the present invention, by adjusting the sizes of the air flow channel and the gas flow channel through the elastic adjusting member 200, no matter whether the load is large or small, the air flow velocity can be maintained within a certain range, so as to achieve a larger adjustment ratio and automatically adapt to larger and smaller loads.

[0039] According to some embodiments of the present invention, as Figure 1 shown in Fig. 5, the elastic adjusting member 200 includes: an adjusting block 210 and an elastic member 220. The adjusting block 210 is movable along the axial direction of the housing 100 between the first position and the second position. The elastic member 220 is respectively connected to the adjusting block 210 and the housing 100, and the elastic member 220 has a force that constantly drives the adjusting block 210 towards the first position. In this way, when the load is small, the adjusting block 210 can block a part of the flow channel under the action of the force of the elastic member 220. When the load is large, the adjusting block 210 is blown towards the flow outlet 102, so that the flow area of the suction flow channel 105 increases. For example, the elastic member 220 is a spring, so that it can be automatically reset by relying on the elastic force of the spring, and the structure is simple and there is no limitation on the installation direction.

[0040] Furthermore, as Figures 3-5 shown, the elastic adjusting member 200 further includes: a fixed seat 230. The fixed seat 230 is installed on the housing 100. The fixed seat 230 is located at the flow outlet 102. The elastic member 220 is respectively connected to the adjusting block 210 and the fixed seat 230, so that the installation is convenient and reliable.

[0041] Optionally, as Figures 3-5 shown, a guiding column 231 is provided at one end of the fixed seat 230 facing the flow inlet 101. The adjusting block 210 is sleeved on the guiding column 231 to be movable along the guiding column 231, so that the movement of the adjusting block 210 is stable and reliable.

[0042] Advantageously, as Figures 3-5As shown, a receiving cavity 211 is defined within the adjusting block 210. The side of the receiving cavity 211 facing the flow outlet 102 is open, the guiding column 231 extends out of the side of the receiving cavity 211 facing the flow inlet 101, and the elastic member 220 is disposed within the receiving cavity 211, so that the structure is relatively compact and has good guiding performance.

[0043] Optionally, as Figure 5 shown, when the elastic adjusting member 200 is in the second position, the fixing seat 230 is located within the receiving cavity 211, that is, the adjusting block 210 covers the fixing seat 230, thus saving space and having high structural reliability.

[0044] Optionally, as Figures 3-5 shown, a first engaging portion 212 is provided within the receiving cavity 211 and a second engaging portion 232 is provided on the fixing seat 230. The elastic member 220 is sleeved on the guiding column 231, and the elastic member 220 is respectively connected to the first engaging portion 212 and the second engaging portion 232, so that the connection is firm and the movement is more stable. For example, the first engaging portion 212 and the second engaging portion 232 are respectively bosses, which is beneficial to improving the stability of the elastic member 220.

[0045] According to some embodiments of the present invention, as Figures 3-5 shown, there are a plurality of control ports, and the plurality of control ports are arranged at intervals along the circumferential direction of the suction flow passage 105. When the elastic adjusting member 200 is in the first position, as Figure 3 shown, a part of the outer peripheral wall of the adjusting block 210 blocks a part of the plurality of control ports, and, as Figure 4 shown, the adjusting block 210 is spaced apart from the remaining part of the plurality of control ports. When the elastic adjusting member 200 is in the second position, the plurality of control ports are opened.

[0046] Here, the outer peripheral wall of the adjusting block 210 blocking a part of the plurality of control ports includes two cases: the outer peripheral wall of the adjusting block 210 blocking some nozzles 107 and the outer peripheral wall of the adjusting block 210 blocking a part of each nozzle 107 among the plurality of nozzles 107. For example, when the elastic adjusting member 200 is in the first position, the nozzle 107 at each control port faces the adjusting block 210.

[0047] According to some embodiments of the present invention, as Figure 3 and Figure 4 shown, an elastic flap 213 is provided on the outer peripheral wall of the adjusting block 210, and the elastic flap 213 blocks the nozzle 107 when the elastic 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 arranged oppositely along 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.

[0048] According to some embodiments of the present invention, as Figures 3-5As shown in the figure, the housing 100 includes: an outer housing 110 and an inner housing 120. The injection inlet 103 is provided on the outer housing 110. The inner housing 120 is provided inside the outer housing 110. The inlet 101, the outlet 102, the control port, the reduced flow channel 104, the suction flow channel 105 and the expansion flow channel 106 are provided on the inner housing 120. There is a gap between the portions of the outer housing 110 and the inner housing 120 that are located between the injection inlet 103 and the control port. The fixing seat 230 is installed on the inner housing 120. In this way, the structure is compact and it is convenient to disassemble and assemble.

[0049] The combustion device according to the second aspect embodiment of the present invention includes the Venturi premixer 10 according to the first aspect embodiment of the present invention. For example, the combustion device is a gas water heater or a wall-mounted boiler.

[0050] The combustion device according to the embodiment of the present invention can automatically adapt to large loads and small loads by using the Venturi premixer 10 as described above.

[0051] It can be understood that the Venturi premixer 10 can be installed upstream of the fan.

[0052] The other components and operations of the combustion device according to the embodiment of the present invention are known to those of ordinary skill in the art and will not be described in detail here.

[0053] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0054] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, the meaning of "plurality" is two or more.

[0055] In the description of the present invention, the "first feature" and the "second feature" may include one or more of such features. When the first feature is "above" or "below" the second feature, it may include direct contact between the first and second features, or may include non-direct contact between the first and second features but through additional features therebetween. The first feature being "above", "over" and "on top of" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the horizontal height of the first feature is higher than that of the second feature.

[0056] It should be noted that in the description of the present invention, unless otherwise clearly defined and limited, the terms "mounted", "connected" and "coupled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected, or indirectly connected through an intermediate medium, or may be the internal communication between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0057] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "specific embodiments", "examples" or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0058] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the claims and their equivalents.

Claims

1. A Venturi premixer, characterized in that, it includes: A housing having an inlet, an outlet and an injection port. A reduced flow channel, a suction flow channel and an expansion flow channel that are sequentially connected from the inlet to the outlet are defined inside the housing. The flow area of the reduced flow channel decreases from the inlet to the outlet, and the flow area of the expansion flow channel increases from the inlet to the outlet. A through control port is provided between the injection port and the suction flow channel; An elastic adjusting member provided in the housing and movable between a first position and a second position. When the elastic adjusting member is in the first position, it extends into the suction flow channel to block the control port, and when the elastic adjusting member is in the second position, it is located in the expansion flow channel to open the control port.

2. The Venturi premixer according to claim 1, characterized in that, the elastic adjusting member includes: An adjusting block movable between the first position and the second position; An elastic member respectively connected to the adjusting block and the housing and having a force that constantly drives the adjusting block towards the first position.

3. The Venturi premixer according to claim 2, characterized in that, the elastic adjusting member further includes: A fixed seat installed on the housing and located at the outlet. The elastic member is respectively connected to the adjusting block and the fixed seat.

4. The Venturi premixer according to claim 3, characterized in that, A guide post is provided at one end of the fixed seat facing the inlet, and the adjusting block is sleeved on the guide post to be movable along the guide post.

5. The Venturi premixer according to claim 4, characterized in that, A receiving cavity is defined inside the adjusting block. One side of the receiving cavity facing the outlet is open. The guide post extends out of the side of the receiving cavity facing the inlet, and the elastic member is arranged in the receiving cavity.

6. The Venturi premixer according to claim 5, characterized in that, when the elastic adjusting member is in the second position, the fixed seat is located in the receiving cavity.

7. The Venturi premixer according to claim 5, characterized in that, A first mating portion is provided in the receiving cavity and a second mating portion is provided on the fixed seat. The elastic member is sleeved on the guide post and respectively connected to the first mating portion and the second mating portion.

8. The Venturi premixer according to claim 1, characterized in that, There are multiple control ports, and the multiple control ports are arranged at intervals along the circumferential direction of the suction flow channel. When the elastic adjusting member is in the first position, the outer peripheral wall of the elastic adjusting member blocks a part of the multiple control ports and is spaced apart from the remaining parts of the multiple control ports. When the elastic adjusting member is in the second position, the multiple control ports are opened.

9. The Venturi premixer according to claim 1, characterized in that, An elastic retaining piece is provided on the outer peripheral wall of the elastic adjusting member, and the elastic retaining piece blocks the control port when the elastic adjusting member is in the first position.

10. The Venturi premixer according to any one of claims 1-9, It is characterized in that the housing includes: an outer shell, on which the spray inlet is provided; an inner shell, which is arranged inside the outer shell. The inflow port, the outflow port, the control port, the reduced flow channel, the suction flow channel and the expansion flow channel are arranged on the inner shell. A part of the outer shell and the inner shell between the spray inlet and the control port has a gap, and the elastic adjusting member is installed on the inner shell.

11. A combustion device It is characterized in that it includes a Venturi premixer according to any one of claims 1-10.

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