Nozzle device for cleaning range hood and range hood

Abstract

The utility model relates to a nozzle device for cleaning a range hood and the range hood, and the nozzle device comprises a nozzle piece which is used for being in fluid communication with a cleaning medium supply device; the floating type movement mechanism comprises a driving motor, a fixed seat and a movable shaft capable of being movably arranged on the fixed seat in a penetrating mode in the axial direction, the driving motor is fixed relative to the fixed seat, the nozzle piece is connected with the movable shaft, and the movable shaft is connected with an output shaft of the driving motor so that the movable shaft can be driven by the driving motor to rotate. A floating telescopic structure is further arranged between the movable shaft and the fixed seat, and the floating telescopic structure is configured in the mode that in the process that the movable shaft is driven by the driving motor to rotate, the fixed seat acts on the movable shaft so that the movable shaft can move in a reciprocating mode in the axis direction of the movable shaft. The impeller cleaning device has the advantages that the jet flow can cover more effective cleaning areas of the impeller, so that the overall cleaning rate is effectively improved.

Description

Technical Field

[0001] This utility model relates to the field of range hood technology, and in particular to a nozzle device for cleaning a range hood and a range hood. Background Technology

[0002] A range hood is a kitchen appliance used to purify the kitchen environment. With the continuous advancement of self-cleaning technology, steam cleaning or water cleaning has been widely used in the field of range hood self-cleaning. The basic principle is that a steam generator produces steam or a water pump pumps water to deliver steam or water to the nozzles at the end of the spray pipe. The steam or water is then quickly sprayed out from the nozzles to clean the impeller and volute.

[0003] Currently, most self-cleaning systems for range hoods use stationary nozzles, while a small number use moving nozzles. The purpose of using moving nozzles is mainly to expand the cleaning range or area, thereby further improving the cleaning efficiency and ensuring the effectiveness of the cleaning.

[0004] For stationary nozzle devices, single or multiple nozzles are often used. The nozzles are installed inside the impeller, with the nozzles facing the pressure surface of the impeller blades. However, static nozzles have a limited cleaning area and can only clean a limited area. The nozzles cannot cover the entire width direction of the blades (impeller axis), so only local areas can be cleaned, resulting in poor cleaning efficiency. At the same time, uneven oil accumulation between cleaned and uncleaned areas can increase impeller vibration and affect the life of the fan.

[0005] For dynamic nozzles, they are essentially single dynamic nozzles, meaning the movement direction of the dynamic nozzle is unidirectional, that is, the axial direction of the covering blades, thereby cleaning the covered surface. For example, the invention patent application with application number CN201711480573.9 (application publication number CN109990332A) discloses a cleaning device for a range hood fan system, located outside the range hood fan. The fan includes a volute with an air outlet and an impeller disposed within the volute. The cleaning device includes a nozzle, and an elongated clearance hole extending along the fan axial direction is opened on the annular wall of the volute. The nozzle outlet faces the opening and moves along the length direction of the opening under the drive of the drive mechanism. Although a single dynamic nozzle solves the problem of incomplete coverage, it places high demands on the moving nozzle. The jet must be coaxial with the nozzle, and the nozzle cannot deviate too much; otherwise, the effective cleaning area of ​​the blades may not be cleaned. Specifically, considering that the nozzle's cleaning target is the pressure surface of the blades, the jet is directed from the back towards the pressure surface through the gap between the blades. However, to ensure performance, the gap between impeller blades is often relatively small. Therefore, the nozzle's jet can only pass through a very small area to clean the pressure surface, as shown in the attached diagram. Figure 1As shown, assuming the target of the cleaning is blade a2, the jet is injected from the upper edge of blade a2 and flushes downward under the guidance of the pressure surface s, cleaning the entire blade a2. However, due to manufacturing errors, installation errors, and jet stability, the nozzle may be biased upward, causing the jet to flush blade a1. At this time, since the flushing point of blade a1 is lower, the lower half of the blade can be cleaned, but the upper edge of blade a1 (the area marked by the elliptical dashed line in the figure) has very poor cleaning efficiency. Therefore, while cleaning is being done while the impeller is rotating, the upper edges of all blades have very low cleaning efficiency, resulting in low overall cleaning efficiency. Alternatively, the jet may be tilted, which may directly cause the nozzle to fail to clean the pressure surface of the blade.

[0006] Therefore, the nozzle devices of existing range hoods still need further improvement. Utility Model Content

[0007] The first technical problem to be solved by this utility model is to provide a nozzle device for cleaning range hoods that enables the jet stream to cover more effective cleaning areas of the impeller, thereby effectively improving the overall cleanliness rate, in light of the current state of the technology.

[0008] The second technical problem to be solved by this utility model is to provide a range hood that uses the above-mentioned nozzle device, in view of the current state of the prior art.

[0009] The technical solution adopted by this utility model to solve the first technical problem is: a nozzle device for cleaning range hoods, comprising:

[0010] The nozzle is used to be in fluid communication with the cleaning medium supply device, so as to spray the cleaning medium onto the impeller of the range hood;

[0011] A floating motion mechanism includes a drive motor, a fixed base, and a movable shaft that is axially movably mounted on the fixed base. The drive motor is fixed relative to the fixed base. The nozzle is connected to the movable shaft, and the movable shaft is connected to the output shaft of the drive motor, so that it can rotate under the drive of the drive motor. A floating telescopic structure is also provided between the movable shaft and the fixed base. The floating telescopic structure is configured such that when the movable shaft is rotated by the drive motor, the fixed base acts on the movable shaft, causing the movable shaft to reciprocate along its own axial direction.

[0012] A floating telescopic structure is installed between the movable shaft and the fixed base. As the nozzle is driven by the motor to rotate, this structure allows the fixed base to act on the movable shaft, causing it to reciprocate along its own axis. This ensures the jet from the nozzle covers the effective cleaning area of ​​the blades, expanding the direct cleaning area and improving the cleaning efficiency. During the cleaning process, as the impeller rotates, the nozzle can cover a larger effective cleaning area, improving the overall cleaning efficiency while reducing manufacturing requirements and providing a degree of tolerance, thus guaranteeing the final cleaning effect.

[0013] The aforementioned "floating telescopic structure" can be understood as a mechanical structure that allows the movable shaft to move periodically along its own axis during rotation, for example, by achieving motion coupling through a cam or a wave-shaped track groove.

[0014] As an improvement, one end of the output shaft and the movable shaft of the drive motor is provided with a insertion hole, and the other end is constructed as a plug-in end suitable for insertion into the insertion hole and capable of transmitting torque in the circumferential direction. The design of the insertion hole and the plug-in end enhances the reliability of circumferential torque transmission and simplifies the assembly process.

[0015] The aforementioned "plug end" can be understood as a shaft end with a specific geometric shape (such as a polygon or spline) that can be matched with a plug hole to transmit torque, such as a hexagonal plug end or a D-type plug end.

[0016] As an optional solution: the floating telescopic structure includes:

[0017] A cam mechanism includes a fixed cam and a cam engagement portion, wherein one of the fixed cam and the cam engagement portion is disposed on the fixed seat and the other is disposed on the movable shaft, and the fixed cam and the cam engagement portion are engaged by a bevel contact.

[0018] A spring assembly includes a spring sleeved on the movable shaft, the spring acting on the movable shaft to provide a restoring force during reciprocating movement of the movable shaft.

[0019] The aforementioned cam mechanism converts rotational motion into axial movement through inclined plane engagement, while the spring assembly provides a restoring force, ensuring the accuracy and continuity of the reciprocating motion of the movable shaft.

[0020] To simplify the structure of the cam mechanism described above, a movable chamber is defined within the fixed base. The portion of the movable shaft located within the movable chamber has a first annular protrusion protruding outwards. The fixed base has a fixed cam extending toward the movable chamber. The outer periphery of the first annular protrusion has cam surfaces arranged continuously in the circumferential direction along the side facing the fixed cam, serving as the cam engagement portion; or

[0021] The fixed seat defines a movable chamber. The fixed seat has a cam surface that extends into the movable chamber and is continuously arranged circumferentially as the cam engagement portion. The portion of the movable shaft located inside the movable chamber has a first annular protrusion that protrudes outward. The fixed cam is provided on the outer periphery of the first annular protrusion along the side facing the cam engagement portion.

[0022] By employing the aforementioned cam mechanism, the first annular protrusion can continuously contact the fixed cam circumferentially, thereby dispersing the stress points, reducing the risk of wear, and extending the service life.

[0023] Considering that asymmetrically distributed cams are prone to generating eccentric loads and affecting the balance of the moving shaft, as an improvement, the fixed cams are an even number and symmetrically distributed on the fixed base; or

[0024] The fixed cams are an even number and symmetrically distributed on the first annular protrusion of the movable shaft.

[0025] The aforementioned fixed cam configuration makes the force on the movable shaft more uniform and symmetrical, avoiding imbalance of the movable shaft caused by unilateral force, and also avoiding inconsistent cam height caused by inconsistent wear of the cam surface.

[0026] To facilitate the assembly of components such as the movable shaft, the fixed seat includes a seat body with an opening and a cover covering the opening. The cover defines the movable chamber after it is placed on the seat body.

[0027] For ease of processing, the fixed cam or cam engagement portion is located on the cover. Integrating the cam mechanism onto the cover simplifies the manufacturing process and facilitates later maintenance or component replacement.

[0028] To securely position the spring and prevent uneven reset force due to displacement, a spring positioning seat is provided in the movable chamber. The spring positioning seat is sleeved outside the movable shaft. The fixed seat also has a first through hole for the movable shaft to pass through. The spring is sleeved outside the movable shaft and abuts against the outer periphery of the first through hole between the spring positioning seat and the fixed seat.

[0029] As another optional solution: the fixed seat defines a movable chamber, and the inner peripheral wall of the movable chamber of the fixed seat has an annular track groove arranged in a wavy pattern along the circumference. The portion of the movable shaft located inside the movable chamber has an outwardly protruding second annular protrusion, and the outer peripheral wall of the second annular protrusion has an outwardly protruding positioning protrusion. The positioning protrusion is slidably constrained in the annular track groove, and together with the annular track groove, it constitutes the floating telescopic structure; or

[0030] The fixed seat defines a movable chamber. The portion of the movable shaft located within the movable chamber has a second annular protrusion protruding outward. An annular track groove arranged in a wave-like pattern along the circumference is formed on the outer peripheral wall of the second annular protrusion. An inwardly protruding positioning protrusion is formed on the inner peripheral wall of the movable chamber of the fixed seat. The positioning protrusion is slidably constrained in the annular track groove and together with the annular track groove, it constitutes the floating telescopic structure.

[0031] The aforementioned "annular track groove" can be understood as a groove that is distributed in a wave-like or spiral shape along the circumference, used to constrain the sliding path of the positioning protrusion, such as a sine wave groove or a sawtooth groove.

[0032] As an improvement, the fixed seat includes a seat body with an opening and a cover covering the opening, the cover defining the movable chamber after being closed on the seat body;

[0033] The second annular protrusion of the movable shaft, on the side opposite to the cover, also has a sliding groove that communicates with the annular track groove, allowing the positioning protrusion to enter the annular track groove; or the inner wall of the seat body also has a sliding groove that communicates with the annular track groove, allowing the positioning protrusion to enter the annular track groove.

[0034] The aforementioned sliding groove design allows the positioning protrusion to quickly embed into the trajectory groove, simplifying the assembly process and improving production efficiency.

[0035] The technical solution adopted by this utility model to solve the second technical problem is as follows: a range hood, including a centrifugal fan and a nozzle device, wherein the centrifugal fan includes a volute and an impeller rotatably disposed within the volute, the impeller including blades arranged sequentially along the circumference, the nozzle device adopts the above-mentioned nozzle device, the nozzle device is arranged on the outside of the volute, and the volute has a second clearance opening for at least the spray port portion of the nozzle to pass through and enter the volute.

[0036] As an improvement, a first mounting plate for fixing to the volute is also included. The fixing seat is disposed on the first mounting plate, and the nozzle component and the fixing seat are respectively located on the front and back sides of the first mounting plate. A first clearance opening is provided on the first mounting plate, and the movable shaft passes through the first clearance opening and is connected to the nozzle component. The first mounting plate places the fixing seat and the nozzle component on opposite sides, optimizing the spatial layout and ensuring that the injection nozzle accurately passes through the volute opening.

[0037] Compared with existing technologies, the advantages of this invention are as follows: A floating telescopic structure is provided between the movable shaft and the fixed base. During the rotation of the nozzle component driven by the drive motor, this floating telescopic structure allows the fixed base to act on the movable shaft and drive it to reciprocate along its own axis. This ensures that the jet from the nozzle component can cover the effective cleaning area of ​​the blades, expanding the direct cleaning area and improving the cleaning efficiency. Furthermore, during the cleaning process, as the impeller rotates, the nozzle component can cover a larger effective cleaning area, improving the overall cleaning efficiency while reducing manufacturing requirements and providing a certain degree of tolerance, thus guaranteeing the final cleaning effect. Attached Figure Description

[0038] Figure 1 This is a schematic diagram of the blade cleaning process of an impeller in the prior art;

[0039] Figure 2 This is a three-dimensional structural diagram of the centrifugal fan according to Embodiment 1 of this utility model;

[0040] Figure 3 This is a three-dimensional structural diagram of the nozzle device according to Embodiment 1 of this utility model;

[0041] Figure 4 This is a cross-sectional view of the nozzle device according to Embodiment 1 of this utility model;

[0042] Figure 5 This is a three-dimensional structural diagram of the movable shaft in Embodiment 1 of this utility model;

[0043] Figure 6 This is a three-dimensional structural diagram of the cover of the fixing seat in Embodiment 1 of this utility model;

[0044] Figure 7 This is a schematic diagram of the blade cleaning process in Example 1 of this embodiment;

[0045] Figure 8 This is a cross-sectional view of the nozzle device according to Embodiment 2 of this utility model;

[0046] Figure 9 This is a three-dimensional structural diagram of the movable shaft in Embodiment 2 of this utility model;

[0047] Figure 10 This is a three-dimensional structural diagram of the base body of the fixing seat in Embodiment 2 of this utility model. Detailed Implementation

[0048] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0049] In the specification and claims of this utility model, terms indicating direction, such as "front," "rear," "upper," "lower," "left," "right," "side," "top," and "bottom," are used to describe various exemplary structural parts and elements of this utility model. However, the use of these terms is merely for the purpose of explanation and is based on the exemplary orientations shown in the accompanying drawings. Since the embodiments disclosed in this utility model can be arranged in different orientations, these terms indicating direction are for illustrative purposes only and should not be regarded as limitations. For example, "upper" and "lower" are not necessarily limited to directions opposite to or consistent with the direction of gravity.

[0050] Example 1

[0051] Figures 1-7 This invention illustrates a preferred embodiment of the nozzle device for cleaning a range hood and the range hood itself. The range hood includes a housing and a centrifugal fan housed within the housing. The housing generally includes a fan frame and a smoke collection hood located at the bottom of the fan frame, with the inner cavity of the fan frame communicating with the inner cavity of the smoke collection hood. An air inlet is provided on the front side wall of the smoke collection hood, allowing external fumes to enter the hood. The centrifugal fan, located within the fan frame, generates negative pressure during operation, drawing external fumes into the smoke collection hood through the air inlet. An oil filter is also provided at the air inlet of the smoke collection hood for filtering fumes. An oil cup, elongated from side to side, is located at the bottom of the smoke collection hood to collect oil stains flowing down from the hood.

[0052] The range hood also includes a cleaning system, which can be automatically activated based on actual usage (i.e., a self-cleaning system) or manually activated by the user. Since the blades 120 of the centrifugal fan impeller 12 are the main components contaminated with grease, the cleaning system primarily targets the impeller 12 for cleaning. The cleaning system generally includes a nozzle device connected to a cleaning medium supply device via piping, which sprays the cleaning medium onto the impeller 12 of the range hood. The cleaning medium supply device is generally located on the range hood casing (e.g., inside or attached to the outside), but can also be separate from the range hood. The cleaning medium supply device typically includes a pump for delivering the cleaning medium, which can be liquid or steam. When the cleaning medium is liquid, a cleaning agent for removing grease is usually added as well.

[0053] Existing range hoods with static or single dynamic nozzles suffer from limited cleaning coverage and low cleaning efficiency due to jet deviation. This embodiment utilizes a floating motion mechanism to make the nozzle component 20 rotate while periodically reciprocating along the axial direction, expanding the jet coverage area, improving the cleaning efficiency of the blade pressure surface, and reducing the dependence on manufacturing precision.

[0054] See Figures 3-6The range hood cleaning nozzle device of this embodiment includes a nozzle component 20, a drive motor 31, a fixed base 42, and a movable shaft 41. The movable shaft 41 and the fixed base 42 are connected by a floating telescopic structure. The nozzle component 20 is connected to an external cleaning medium supply device (such as a water pump or steam generator) through a pipeline, and the spray nozzle faces the pressure surface of the impeller 12 blades. The drive motor 31 is fixed to one side of the fixed base 42, and the output shaft 311 is connected to the movable shaft 41 through a plug-in end 3110. Specifically, one end of the movable shaft 41 is plugged into the output shaft 311 of the drive motor 31, and the other end passes through the first through hole 4210 of the fixed base 42 and is connected to the auxiliary connecting arm 32. The nozzle component 20 is detachably connected to the auxiliary connecting wall. The output shaft 311 of the drive motor 31 is connected to the movable shaft 41 via a plug-in structure. Specifically, the fixed shaft end has a plug-in hole 410, and the movable shaft 41 end has a plug-in end 3110 that matches the plug-in hole 410. The cross-section of the plug-in hole 410 and the cross-section of the plug-in end 3110 are both non-circular. Thus, after the two are plugged in, torque can be transmitted circumferentially, while allowing the movable shaft 41 to move freely axially. The axial direction of the movable shaft 41 is substantially perpendicular to the axial direction of the impeller 12.

[0055] The insertion end 3110 of the output shaft 311 of the drive motor 31 is clearance-fitted with the insertion hole 410 of the movable shaft 41 to ensure that the movable shaft 41 can reciprocate axially. The fit length between the insertion end 3110 and the insertion hole 410 must be greater than the set axial displacement of the movable shaft 41, with a margin of more than 3mm to ensure that the output shaft 311 does not come out.

[0056] Combination Figure 2In this embodiment, the nozzle device is fixed to the outside of the volute 10 of the range hood via a first mounting plate 51. A first clearance opening 510 is provided on the first mounting plate 51, through which the movable shaft 41 passes and connects to the nozzle component 20. The nozzle component 20 is an elongated tube, with its nozzle passing through a second clearance opening (not shown) on the volute 10 and entering the interior of the volute 10. An auxiliary connecting arm 32 is connected to the end of the movable shaft 41, and the nozzle component 20 is detachably installed in the mounting groove 320 at the end of the auxiliary connecting arm 32 and fixed by a cover plate 321. The auxiliary connecting arm 32 and the movable shaft 41 are connected by a non-circular limiting structure, such as a non-circular hole on the main body of the auxiliary connecting arm 32, and the end of the movable shaft is also designed with a corresponding non-circular profile. The connection structure between the main body of the auxiliary connecting arm 32 and the cover plate 321 can be fixed by screws 323, by a snap-fit ​​assembly 322, or by a combination of screws 323 and snap-fit ​​322. The auxiliary connecting arm 32 has two latches 322 on its main body, and the cover 422 has two corresponding slots 3210 for the latches 322 to engage. After the auxiliary connecting arm 32 is assembled with the cover 321 by the latches 322 assembly, it is then fixed with screws 323. See details. Figure 4 .

[0057] This embodiment of the floating telescopic structure includes a cam mechanism and a spring 43 assembly, which enables the axial reciprocating motion of the movable shaft 41. Specifically, the fixed seat 42 includes a seat body 421 and a cover 422, which, when closed, forms a movable chamber 420. Two fixed cams 401 are symmetrically arranged on the inner side of the cover 422. The extension direction of the fixed cams 401 is consistent with the axial direction of the movable shaft 41, and the outer contour of the fixed cams 401 is a smoothly transitioned curved surface structure. The portion of the movable shaft 41 located in the movable chamber 420 has an outwardly extending first annular protrusion 411. A cam engagement portion 402 (an inclined surface matching the fixed cam 401) is continuously arranged circumferentially on the outer edge of the first annular protrusion 411. Specifically, the cam engagement portion 402 has a cam surface continuously arranged circumferentially, with the cam surface facing the side where the fixed cam 401 is located. The cam surface of the cam engagement portion 402 is a wavy curved surface structure. The two fixed cams 401 on the cover 422 are symmetrically designed, which can make the moving shaft 41 bear force evenly, avoid eccentric wear, extend the service life of the floating telescopic structure, and ensure the stability of axial movement.

[0058] The spring 43 assembly includes a spring 43 and a spring positioning seat 431. It is sleeved on the outside of the movable shaft 41, with its two ends abutting against the edges of the first through holes 4210 of the spring positioning seat 431 and the fixed seat 42, respectively. The spring positioning seat 431 abuts against the first annular protrusion 411 of the movable shaft 41, and has a positioning groove therein for limiting the end of the spring 43, ensuring that the spring 43 provides a uniform restoring force when compressed. The spring positioning seat 431 and the fixed seat 42 have a clearance fit, allowing for relatively flexible rotation. When the drive motor 31 drives the movable shaft 41 to rotate, the cam engagement portion 402 of the movable shaft 41 contacts the inclined surface of the fixed cam 401 to achieve sliding, thereby pushing the movable shaft 41 to move axially. When the movable shaft 41 rotates a certain angle, the fixed cam 401 moves along the cam surface of the cam engagement portion 402 from the highest point to the corresponding trough position, and the spring 43 pushes the movable shaft 41 to reset, forming a reciprocating motion.

[0059] The upper surface of the spring positioning seat 431 should have a contact area with the movable shaft 41 minimized to avoid excessive resistance. If the contact area is large, a concentric ring support (not shown in the figure) can be designed to reduce frictional resistance. The lower end of the spring positioning seat 431 should have a convex edge for positioning the spring 43 (a positioning groove is formed between the two convex edges) to ensure the position of the spring 43. A convex edge for positioning the spring 43 can also be designed on the fixed seat 42. The spring 43 should have a certain preload after installation.

[0060] After the drive motor 31 starts, the movable shaft 41 drives the nozzle component 20 to rotate, and at the same time the cam mechanism and spring 43 convert the rotational motion into axial motion (e.g., Figure 7 The nozzle jet moves reciprocally in the direction A shown in the diagram. Under the combined motion of rotation and axial movement, the nozzle jet forms a spiral cleaning trajectory, covering the entire width (axial direction) of the blade pressure surface s, thus avoiding jet deviation problems caused by installation errors.

[0061] A first mounting plate 51 is fixed to the outside of the centrifugal fan casing 10. A mounting base 42 is fixed to the mounting plate with bolts. The nozzle component 20 passes through the first clearance opening 510 of the mounting plate and the second clearance opening of the casing 10, extending into the interior of the casing 10. When the impeller 12 rotates, the drive motor 31 starts synchronously. The combined motion of the nozzle component 20 enables the jet to accurately cover the blade pressure surface s, extending the cleaning range to the entire axial length of the blade and effectively improving the cleaning effect.

[0062] This embodiment primarily uses coupled motion to allow the nozzle component 20 to have a certain amount of displacement in the axial direction of the movable shaft 41, thereby increasing the longitudinal coverage of the impeller 12 and ensuring that the nozzle component 20 can cover the effective cleaning area of ​​the blades. Furthermore, by coupling the rotational motion of the impeller 12, even more effective cleaning areas can be covered, improving the overall cleanliness rate. Simultaneously, it reduces manufacturing requirements, provides a certain degree of error tolerance, and guarantees the final cleaning effect. Figure 7As shown, if the nozzle 20 deviates from the cleaning point of the upper blade a1, the cleaning efficiency will decrease (see the background art for details). However, by increasing the vertical movement A, the nozzle 20 can move up and down. The cleaning point will not remain at the cleaning point of blade a1 as shown in the figure, but will move within the effective area between the upper edges of blade a1 and blade a2. Therefore, the cleaning area expands, that is, the effective cleaning area increases, and the cleanliness rate improves. At the same time, the pressure surface s exposed between the two blades is cleaned by direct jet impact, resulting in greater cleaning force and a significant improvement in cleanliness. Moreover, oil stains are concentrated at the outer edge of the blades, so the cleanliness rate can be effectively improved. In addition, because of the vertical movement displacement, there is no need to worry about minor manufacturing or installation errors, reducing manufacturing requirements. Combined with the rotational speed of the impeller 12, the coverage rate can be further improved, thus increasing the cleanliness rate.

[0063] The "pressure side" of the blades mentioned above refers to the side of the blade that directly propels the air (or fumes) during rotation and bears higher fluid pressure. The cross-section of the impeller blades is usually curved, with the pressure side located on the concave side of the blade (i.e., the inner side of the blade facing the center of rotation), while the suction side is located on the convex side (outer side).

[0064] Example 2

[0065] See Figures 8-10 The difference between this embodiment and Embodiment 1 lies in the floating telescopic structure between the fixed base 42 and the movable shaft 41. Specifically, this embodiment replaces the cam mechanism with a wavy track groove and a positioning protrusion 404, eliminating the need for the spring 43 assembly, simplifying the structure and improving motion stability, making it suitable for high-frequency reciprocating motion scenarios. Specifically, the movable shaft 41 has an outwardly extending second annular protrusion 412 with a wavy annular track groove 403 (such as a sine wave, the distance between the crest and trough can be rotated according to actual needs) on its outer peripheral wall. The fixed base 42 has two symmetrical positioning protrusions 404 on its inner peripheral wall, which are slidably constrained in the annular track groove 403. For ease of assembly, the second annular protrusion 412 of the movable shaft 41 has two sliding slots 405 that communicate with the annular track groove 403. During assembly, the two positioning protrusions 404 on the fixed base 42 enter the annular track groove 403 through the aforementioned sliding slot 405. When the drive motor 31 drives the movable shaft 41 to rotate, the positioning protrusions 404 slide along the wavy track groove, forcing the movable shaft 41 to move axially periodically.

[0066] The aforementioned positioning protrusion 404 can be integrated with the fixed base 42, or it can be a separate component mounted additionally to the fixed base 42. If the positioning protrusion is integrated with the fixed base 42, the aforementioned sliding groove 405 is correspondingly designed on the movable shaft 41 to ensure that the movable shaft 41 can be installed in place. The position of the sliding groove 405 is related to the rotation direction of the movable shaft 41, and the sliding groove 405 should be positioned away from the side where the annular track groove 403 (and the positioning protrusion) applies force. See also... Figure 9 The movable shaft 41 rotates clockwise when viewed from above. The sliding groove 405 is designed on the lower side of the annular track groove 403 opposite to the positioning protrusion to avoid affecting the movement.

[0067] This invention utilizes a floating motion mechanism to convert the rotational motion of the drive motor 31 into the axial reciprocating movement of the movable shaft 41, enabling the nozzle jet to form a multi-dimensional motion trajectory. This design overcomes the limitations of traditional static or single dynamic nozzles, achieving high coverage cleaning by utilizing the synergistic effect of mechanical coupling (cam or track groove) and elastic reset (spring 43), while reducing the stringent requirements for the precision of parts machining.

[0068] The term "fluid connectivity" as used in this invention refers to the spatial relationship between two components or parts (hereinafter referred to as the first part and the second part, respectively), that is, a fluid (gas, liquid, or a mixture of both) can flow from the first part along a flow path and / or be transported to the second part. This can be a direct connection between the first part and the second part, or an indirect connection between the first part and the second part through at least one third party. The third party can be a fluid channel such as a pipe, channel, conduit, guide, hole, or groove, or a chamber or combination thereof that allows fluid to flow through.

[0069] Based on the above embodiments, other embodiments can be obtained by replacing and improving the relevant technical features. For example, the positions of the fixed cam 401 and the cam engagement portion 402 in Embodiment 1 can be interchanged. That is, the fixed seat 42 has a cam surface that extends into the movable chamber 420 and is continuously arranged in the circumferential direction as the cam engagement portion 402, and the outer periphery of the first annular protrusion 411 of the movable shaft 41 is provided with a corresponding fixed cam 401 along the side facing the cam engagement portion 402. There can also be two fixed cams 401 symmetrically arranged. As another example, the positions of the annular track groove 403 and the positioning protrusion 404 in Embodiment 2 can also be interchanged. That is, the inner peripheral wall of the movable chamber 420 of the fixed seat 42 is provided with an annular track groove 403 arranged in a wavy shape in the circumferential direction, and the outer peripheral wall of the second annular protrusion 412 of the movable shaft 41 has a positioning protrusion 404 protruding outward, and there can also be two positioning protrusions 404 symmetrically arranged. For example, in the plug-in structure between the output shaft 311 of the drive motor 31 and the movable shaft 41, the positions of the plug-in end 3110 and the plug-in hole 410 can also be interchanged. That is, a corresponding plug-in hole 410 is provided on the output shaft 311 of the drive motor 31, and the corresponding end of the movable shaft 41 is the plug-in end 3110 that can be inserted into the plug-in hole 410 of the output shaft 311.

Claims

1. A nozzle device for cleaning a range hood, comprising: a nozzle member (20) for being in fluid communication with a cleaning medium supply device so as to spray a cleaning medium to an impeller (12) of the range hood; characterized in that it further comprises: a floating movement mechanism comprising a driving motor (31), a fixed seat (42), and a movable shaft (41) movably arranged in the fixed seat (42) in an axial direction, the driving motor (31) being fixed relative to the fixed seat (42), the nozzle member (20) being connected to the movable shaft (41), the movable shaft (41) being connected to an output shaft (311) of the driving motor (31) so as to be rotatable under the driving of the driving motor (31), and a floating expansion structure being further arranged between the movable shaft (41) and the fixed seat (42), the floating expansion structure being configured to allow the fixed seat (42) to act on the movable shaft (41) so as to reciprocally move the movable shaft (41) along its axial direction during the rotation of the movable shaft (41) under the driving of the driving motor (31).

2. The range hood cleaning nozzle device according to claim 1, characterized in that: An insertion hole (410) is formed in one end of the output shaft (311) of the driving motor (31) and the other end is configured as an insertion end (3110) suitable for being inserted into the insertion hole (410) and capable of transmitting torque in a circumferential direction.

3. The extractor hood cleaning nozzle device according to claim 1 or 2, characterized in that: The floating expansion structure comprises: a cam mechanism comprising a fixed cam (401) and a cam engaging portion (402), one of the fixed cam (401) and the cam engaging portion (402) being arranged on the fixed seat (42) and the other being arranged on the movable shaft (41), the fixed cam (401) and the cam engaging portion (402) being in contact with each other through a slope surface; a spring (43) assembly comprising a spring (43) arranged on the movable shaft (41), the spring (43) acting on the movable shaft (41) to provide a restoring force when the movable shaft (41) reciprocally moves.

4. The range hood cleaning nozzle device according to claim 3, characterized in that: The fixed seat (42) defines a movable chamber (420) therein, a portion of the movable shaft (41) located in the movable chamber (420) has a first annular protrusion (411) protruding outward, the fixed seat (42) has the fixed cam (401) extending into the movable chamber (420), and the outer periphery of the first annular protrusion (411) on a side facing the fixed cam (401) has a cam surface arranged continuously in a circumferential direction as the cam engaging portion (402); or the fixed seat (42) defines a movable chamber (420) therein, the fixed seat (42) has a cam surface arranged continuously in a circumferential direction as the cam engaging portion (402) extending into the movable chamber (420), and a portion of the movable shaft (41) located in the movable chamber (420) has a first annular protrusion (411) protruding outward, and the fixed cam (401) is arranged on a side of the outer periphery of the first annular protrusion (411) facing the cam engaging portion (402).

5. The range hood cleaning nozzle device according to claim 4, characterized in that: The fixed cam (401) is even and symmetrically distributed on the fixed seat (42); or The fixed cam (401) is even and symmetrically distributed on the first annular convex part (411) of the movable shaft (41).

6. The range hood cleaning nozzle device according to claim 5, characterized in that: The fixed seat (42) comprises a seat body (421) with an opening and a cover body (422) covering the opening, and the cover body (422) defines the movable cavity (420) after covering the seat body (421).

7. The range hood cleaning nozzle device according to claim 6, characterized in that: The fixed cam (401) or the cam engaging part (402) is arranged on the cover body (422).

8. The range hood cleaning nozzle device according to claim 4, characterized in that: Further comprising a spring positioning seat (431) arranged in the movable cavity (420), the spring positioning seat (431) is sleeved outside the movable shaft (41), the fixed seat (42) is further provided with a first through hole (4210) for the movable shaft (41) to pass through, and the spring (43) is sleeved outside the movable shaft (41) and abuts between the spring positioning seat (431) and the outer peripheral edge of the first through hole (4210) of the fixed seat (42).

9. The range hood cleaning nozzle device according to claim 1 or 2, characterized in that: The fixed seat (42) defines a movable cavity (420), the inner peripheral wall of the movable cavity (420) of the fixed seat (42) is provided with an annular track groove (403) arranged in a wave shape in the circumferential direction, the part of the movable shaft (41) located in the movable cavity (420) has a second annular convex part (412) protruding outward, the outer peripheral wall of the second annular convex part (412) has a positioning protrusion (404) protruding outward, the positioning protrusion (404) is slidingly constrained in the annular track groove (403), and the annular track groove (403) and the positioning protrusion (404) jointly constitute the floating telescopic structure; or The fixed seat (42) defines a movable cavity (420), the part of the movable shaft (41) located in the movable cavity (420) has a second annular convex part (412) protruding outward, the outer peripheral wall of the second annular convex part (412) is provided with an annular track groove (403) arranged in a wave shape in the circumferential direction, and the inner peripheral wall of the movable cavity (420) of the fixed seat (42) has a positioning protrusion (404) protruding inward, the positioning protrusion (404) is slidingly constrained in the annular track groove (403), and the annular track groove (403) and the positioning protrusion (404) jointly constitute the floating telescopic structure.

10. The range hood cleaning nozzle device according to claim 9, characterized in that: The fixed seat (42) comprises a seat body (421) with an opening and a cover body (422) covering the opening, and the cover body (422) defines the movable cavity (420) after covering the seat body (421). The second annular protrusion (412) of the movable shaft (41) further has a sliding slot (405) penetrating the annular track slot (403) and allowing the positioning protrusion (404) to enter the annular track slot (403) from the side where the cover (422) is located; or the inner wall of the seat body (421) further has a sliding slot (405) penetrating the annular track slot (403) and allowing the positioning protrusion (404) to enter the annular track slot (403).

11. An extractor hood comprising a centrifugal fan comprising a volute (10) and an impeller (12) rotatably arranged in the volute (10), the impeller (12) comprising blades arranged in succession in the circumferential direction, characterized in that: The nozzle device adopts the nozzle device for cleaning the range hood according to any one of claims 1-10, and the nozzle device is arranged on the outer side of the volute (10), and the volute (10) is provided with a second accommodation opening through which at least the part of the nozzle piece (20) where the spray port is located enters the volute (10).

12. The hood according to claim 11, characterized in that: Further comprising a first mounting plate (51) for fixing the volute (10), the fixing seat (42) is arranged on the first mounting plate (51), the nozzle piece (20) and the fixing seat (42) are respectively arranged on the front and back sides of the first mounting plate (51), the first mounting plate (51) is provided with a first accommodation opening (510), and the movable shaft (41) is connected with the nozzle piece (20) through the first accommodation opening (510).

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