Nozzle holder and stove
By setting a tapering section in the main channel of the nozzle seat, the problem of reduced flow caused by the loss of gas momentum along the nozzle path in the multi-nozzle structure is solved, thereby improving the gas flow rate and dynamic pressure and ensuring stable gas supply to the downstream nozzle.
Patent Information
- Application Number
- CN202520495047.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-19
- Publication Date
- 2026-02-03
- Estimated Expiration
- 2035-03-19
AI Technical Summary
In existing nozzle holders with multi-nozzle structures, the different travel distances from the gas inlet to different gas outlets lead to increased momentum loss along the gas path and reduced flow rate at downstream nozzles.
A nozzle holder is designed by setting a main channel and a branch channel in the base. The main channel includes a tapering section with a cross-sectional area that decreases along the airflow direction. According to the law of conservation of flow, the flow velocity and dynamic pressure are increased to compensate for the momentum loss along the flow path.
By increasing the flow velocity and dynamic pressure, the pressure drop in the downstream nozzle tube is alleviated, ensuring flow uniformity and stability, and reducing gas loss along the flow path.
Smart Images
Figure CN223869200U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the technical field of cooking equipment, and in particular to a nozzle holder and a stove. Background Technology
[0002] The nozzle seat, as a structure connecting the air inlet pipe and the gas nozzle, is mainly used to transport and distribute gas, providing a stable gas environment for burner combustion.
[0003] Normally, the gas passage of a nozzle holder corresponds to one gas inlet and one gas outlet. However, in some special cases (such as multi-jet systems), the gas passage of the nozzle holder needs to achieve one gas inlet corresponding to multiple gas outlets. However, for such nozzle holders, since the travel distance from the gas inlet to different gas outlets is different, the momentum loss of the gas along the travel distance will increase with the increase of the travel distance, which in turn will lead to a decrease in the flow velocity and flow rate of the downstream nozzle. Utility Model Content
[0004] Therefore, it is necessary to provide a nozzle holder and stove that can compensate for the momentum loss of gas along the path and improve the reduced flow rate of downstream nozzles in current multi-nozzle nozzle holders.
[0005] This application first provides a nozzle seat, including a base and a plurality of nozzle tubes fixed to the base at intervals along the axial direction of the base. The base has a main channel opened in its own axial direction. One end of the main channel is connected to the outside to form an air inlet. Each nozzle tube has a branch channel that is connected to the main channel. Each branch channel has an air jet port connected to the side away from the main channel.
[0006] The main channel includes a tapering section, and each tapering section is connected to two adjacent branch channels at both ends, and the cross-sectional area of each tapering section decreases in the direction away from the air inlet.
[0007] In one embodiment, the diameter, length, and angle between each branch channel and the main channel are all equal.
[0008] In one embodiment, the ratio k of the upstream cross-sectional area to the downstream cross-sectional area of any of the tapered segments satisfies:
[0009]
[0010] Where f is the coefficient of friction of the inner wall of the tapered section, L is the length of the tapered section, and D... avg The average diameter of the tapering segment.
[0011] In one embodiment, all the tapered segments are identical.
[0012] In one embodiment, the cross-sectional area of each of the tapering sections decreases linearly in the direction away from the air inlet.
[0013] In one embodiment, the length L of the tapered section is equal to the average diameter D of the tapered section. avg 3 to 5 times.
[0014] In one embodiment, the nozzle seat includes two of the nozzle tubes.
[0015] In one embodiment, the main channel further includes an extension that communicates with the branch channel furthest from the air inlet.
[0016] In one embodiment, the main channel further includes an air intake section, one end of which is the air intake port, and the other end is connected to the branch channel closest to the air intake port.
[0017] A second aspect of this application provides a cooktop including the aforementioned nozzle holder.
[0018] The aforementioned nozzle seat, by gradually reducing the cross-sectional area of the tapered section along the airflow direction, according to the flow conservation law Q=ρAV, the reduction of the cross-sectional area A can increase the flow velocity V, thereby increasing the dynamic pressure. The increase in dynamic pressure can compensate for the pressure loss along the flow path, thereby alleviating the pressure drop in the downstream nozzle tube. Attached Figure Description
[0019] Figure 1 This is a perspective view of the nozzle holder of this application;
[0020] Figure 2 for Figure 1 A sectional view taken from the frontal view angle.
[0021] Reference numerals: 10, base; 11, main channel; 11a, air inlet; 11b, tapering section; 11c, extension section; 11d, air inlet section; 20, nozzle pipe; 21, branch channel; 21a, jet nozzle. Detailed Implementation
[0022] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.
[0023] In the description of this utility model, 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., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.
[0024] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.
[0025] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.
[0026] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.
[0027] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.
[0028] Please combine Figure 1 as well as Figure 2 As shown, this application first provides a nozzle seat, including a base 10 and a plurality of nozzle tubes 20 fixed at intervals along the axial direction of the base 10. A main channel 11 is opened in the base 10 along its own axial direction. One end of the main channel 11 is connected to the outside to form an air inlet 11a. Each nozzle tube 20 is provided with a branch channel 21 connected to the main channel 11. The side of each branch channel 21 away from the main channel 11 is connected to an air outlet 21a.
[0029] The main channel 11 includes a tapered section 11b, and each tapered section 11b is connected to two adjacent branch channels 21 at both ends, and the cross-sectional area of each tapered section 11b decreases in the direction away from the air inlet 11a.
[0030] In this application, by gradually reducing the cross-sectional area of the tapered section 11b along the airflow direction, according to the flow conservation law Q=ρAV, the reduction of the cross-sectional area A can increase the flow velocity V, thereby increasing the dynamic pressure. The increase in dynamic pressure can compensate for the pressure loss along the flow path, thereby alleviating the pressure drop of the downstream nozzle pipe 20.
[0031] Please combine Figure 1 as well as Figure 2 As shown, in some embodiments, the diameter, length, and included angle between each branch channel 21 and the main channel 11 are all equal; to ensure that the resistance of all branch channels 21 is the same, so that when the pressure in the main channel 11 decreases uniformly, the pressure difference of each nozzle tube 20 is small, and the flow deviation is more easily suppressed.
[0032] In some embodiments, the ratio k of the upstream cross-sectional area to the downstream cross-sectional area of any tapered segment 11b satisfies:
[0033] Where f is the coefficient of friction of the inner wall of the tapered section 11b, and L is the length of the tapered section 11b. avg The average diameter of the tapered section 11b.
[0034] It should be noted that although the increase in flow velocity resulting from the reduction in cross-sectional area can bring about an increase in dynamic pressure, the increase in flow velocity will also lead to an increase in friction loss. Therefore, the amount of reduction in the tapering section 11b needs to ensure that the dynamic pressure gain is greater than or equal to the friction loss, so as to alleviate the pressure drop in the downstream nozzle tube 20.
[0035] Specifically, assume the upstream cross-sectional area of the contracting segment 11b is A. i The upstream gas velocity is V i The downstream cross-sectional area is A j The downstream gas velocity is V j ,but
[0036] Dynamic pressure increment of tapered section 11b
[0037] Friction pressure loss along the tapered section 11b
[0038] Among them, V avg The average flow velocity of the converging section 11b is...
[0039] To ensure that the dynamic pressure increment P1 of the tapered section 11b can compensate for the friction loss P2 along the way, i.e.
[0040]
[0041] Let the cross-sectional area ratio According to the mass flow conservation requirement A i V i =A j V j Therefore V j =kV i ,
[0042] Will and V j =kV i After substituting and simplifying, we get:
[0043]
[0044] Please combine Figure 1 as well as Figure 2 As shown, in some embodiments, each tapering segment 11b is identical, so that the cross-sectional area of each tapering segment 11b is reduced synchronously and proportionally to ensure that the flow velocity of each tapering segment 11b is approximately constant, thereby avoiding significant loss of dynamic pressure due to a sudden drop in flow velocity, and also limiting the rate of increase of friction loss, ensuring that the pressure loss of each segment increases smoothly.
[0045] Please combine Figure 1 as well as Figure 2As shown, in some embodiments, the cross-sectional area of each tapering segment 11b decreases linearly in the direction away from the air inlet 11a.
[0046] The cross-sectional area changes uniformly under the linear decreasing condition, the velocity increase gradient in the tapered section 11b is small, and the streamline contraction transition is natural, which can effectively avoid flow separation or turbulence caused by sudden velocity changes. In addition, under the linear tapering condition, the dynamic pressure increment and the friction loss increment show an approximately linear relationship, which is convenient for segmented matching design.
[0047] Of course, in some other embodiments, the cross-sectional area of each tapering segment 11b may also decrease exponentially or according to other function curves, which will not be listed here.
[0048] In some embodiments, the length L of the tapered section 11b is equal to the average diameter D of the tapered section 11b. avg 3 to 5 times; specifically, the average diameter D avg =(D max +D min ) / 2, where D max D is the diameter of the upstream end of the tapered section 11b. min The diameter is the downstream end of the tapered section 11b.
[0049] If the length L and the average diameter D avg If the ratio of length L to average diameter D is too small, meaning the cone angle of the tapered section 11b is too large, boundary layer separation will occur due to the rapid contraction of the streamlines, generating vortices and turbulence and leading to additional energy loss; conversely, if the ratio of length L to average diameter D is too large, the boundary layer separation will occur due to the rapid contraction of the streamlines, resulting in vortices and turbulence and causing additional energy loss. avg If the ratio is too large, that is, the cone angle of the tapered section 11b is too small, on the one hand, the stroke of the tapered section 11b is too long, which may cause the friction loss to exceed the dynamic pressure gain; on the other hand, the pipe is too long, which will also increase the material and installation costs.
[0050] In this application, by controlling the ratio of the two to 3 to 5, it is possible to minimize turbulence generation and reduce material and installation costs while ensuring that the dynamic pressure gain is greater than the separation loss.
[0051] Please combine Figure 1 as well as Figure 2 As shown, in some embodiments, the nozzle seat includes two nozzle tubes 20.
[0052] Of course, in some other embodiments, the nozzle seat may also include other numbers of nozzle tubes 20, as long as the flow rates of each nozzle tube 20 are relatively close.
[0053] Please combine Figure 1 as well as Figure 2 As shown, in some embodiments, the main channel 11 further includes an extension 11c, which is connected to the branch channel 21 furthest from the air inlet 11a.
[0054] It is easy to understand that if the end of the main channel 11 is directly connected to the branch channel 21, the geometric change at the end of the main channel 11 is likely to cause flow separation or vortices, resulting in turbulent flow field and abnormal local pressure drop. However, by setting the extension section 11c, the end of the main channel 11 (extension section 11c) remains a continuous pipe without branches. After passing through the last branch channel 21, the airflow will gradually decelerate and stabilize in the extension section 11c, avoiding the impact of abrupt flow field on nozzle performance.
[0055] Please combine Figure 1 as well as Figure 2 As shown, in some embodiments, the main channel 11 further includes an air intake section 11d, one end of which is an air intake port 11a, and the other end is connected to the branch channel 21 closest to the air intake port 11a.
[0056] A second aspect of this application provides a cooktop including the aforementioned nozzle holder.
[0057] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.
[0058] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.
Claims
1. A nozzle holder, characterized in that, Includes a base (10) and multiple nozzle pipes (20) fixed at intervals along the axial direction of the base (10). The base (10) has a main channel (11) opened in its own axial direction. One end of the main channel (11) is connected to the outside to form an air inlet (11a). Each nozzle pipe (20) has a branch channel (21) connected to the main channel (11). Each branch channel (21) has a jet outlet (21a) connected to the side away from the main channel (11). The main channel (11) includes a tapered section (11b), each of which is connected to two adjacent branch channels (21) at both ends, and the cross-sectional area of each tapered section (11b) decreases in the direction away from the air inlet (11a).
2. The nozzle holder according to claim 1, characterized in that, The diameter, length, and included angle between each of the branch channels (21) and the main channel (11) are all equal.
3. The nozzle holder according to claim 2, characterized in that, The ratio k of the upstream cross-sectional area to the downstream cross-sectional area of any of the tapered segments (11b) satisfies: Where f is the coefficient of friction of the inner wall of the tapered section (11b), L is the length of the tapered section (11b), and D is the coefficient of friction of the inner wall of the tapered section (11b). avg The average diameter of the tapered section (11b) is given.
4. The nozzle holder according to claim 3, characterized in that, The tapering segments (11b) described are all identical.
5. The nozzle holder according to claim 3, characterized in that, The cross-sectional area of each of the tapering sections (11b) decreases linearly in the direction away from the air inlet (11a).
6. The nozzle holder according to claim 4, characterized in that, The length L of the tapered section (11b) is equal to the average diameter D of the tapered section (11b). avg 3 to 5 times.
7. The nozzle holder according to claim 1, characterized in that, The nozzle seat includes two nozzle tubes (20).
8. The nozzle holder according to claim 1, characterized in that, The main channel (11) also includes an extension section (11c), which is connected to the branch channel (21) furthest from the air inlet (11a).
9. The nozzle holder according to claim 1, characterized in that, The main channel (11) also includes an air intake section (11d), one end of which is the air intake port (11a), and the other end is connected to the branch channel (21) closest to the air intake port (11a).
10. A stove, characterized in that, Includes the nozzle seat as described in any one of claims 1 to 9.