A driving mechanism for a range hood and a range hood

Abstract

The utility model discloses a kind of driving mechanism for range hood and range hood, the driving mechanism for range hood includes: push rod, it includes outer tube and the inner tube that can be relative to outer tube and retract along X direction;And bellows, opposite two ends along X direction respectively with outer tube and inner tube are fixed;When the inner tube is in the contraction state relative to outer tube, the bellows is in compression state.

Description

Technical Field

[0001] This utility model relates to a power device, and more particularly to a drive mechanism for a range hood, and a range hood using the drive mechanism. Background Technology

[0002] A range hood is a kitchen appliance that purifies the kitchen environment. It can quickly remove waste from the stove and fumes produced during cooking and exhaust them outdoors, reducing pollution and purifying the air.

[0003] Most existing range hoods have moving parts, such as the flip-up baffle in side-draft range hoods and the adjustable baffle in top-draft range hoods. Currently, the commonly used drive mechanisms for these moving parts are basically of two types: push rods and geared motors combined with hinge structures. To ensure the required lifespan, these moving parts need to be oil-proofed. Common oil-proofing methods are: 1. Placing the drive components outside the oil passage. 2. If inside the oil passage, adding a sealing protective shell for sealing.

[0004] For example, Chinese Patent Application No. 202223386912.6 discloses a driving mechanism for a smoke-collecting plate of a range hood, which includes a push rod assembly. The push rod assembly includes a push rod and a driving device. The push rod is set on the range hood body and connected to the output end of the driving device. The push rod assembly also includes an oil-proof sleeve, which is set on the push rod to prevent oil stains from adhering to the push rod. A fixing part is provided on the fixed end of the push rod, and an installation part is provided on the movable end of the push rod. One end of the oil-proof sleeve is connected to the fixing part, and the other end is connected to the installation part. The movement of the push rod drives the oil-proof sleeve to move synchronously in a telescopic motion.

[0005] The aforementioned existing technology for oil-proof sleeves used for push rods commonly uses corrugated pipes. Since the two ends are connected to a fixing component and a telescopic component respectively, they need to expand and contract relative to each other. However, the corrugated pipes currently used in oil circuits on the market will crack in a short time. Once cracks appear, oil and water will seep into the driver, which will cause the motor commutator to short-circuit and affect the normal operation of the range hood. Utility Model Content

[0006] The first technical problem to be solved by this utility model is to address the shortcomings of the existing technology by providing a drive mechanism for a range hood, extending the service life of the oil-proof components, and ensuring the normal operation of the drive mechanism.

[0007] The second technical problem to be solved by this utility model is to provide a range hood with the above-mentioned drive mechanism.

[0008] The technical solution adopted by this utility model to solve the first technical problem mentioned above is: a drive mechanism for a range hood, comprising:

[0009] A push rod, comprising an outer tube and an inner tube capable of extending and retracting relative to the outer tube in the X direction; and

[0010] A bellows, with its two opposite ends along the X direction fixed to an outer tube and an inner tube respectively;

[0011] Its features are:

[0012] When the inner tube is in a contracted state relative to the outer tube, the bellows is in a compressed state.

[0013] By ensuring that the bellows is in a compressed state when the push rod of the drive mechanism is in its initial, unextended state, the bellows can be stretched to its natural state first and then elongated when the push rod of the drive mechanism extends. This reduces the elongation ratio of the bellows 33 compared to the bellows in its initial, natural state throughout the entire stroke, increases the bellows' lifespan, and ensures the normal operation of the drive mechanism.

[0014] Preferably, to ensure the bellows is sealed and oil-proof, one end of the bellows is fixed to the portion of the inner tube that protrudes from the outer tube, and the other end of the bellows is fixed to the outer tube. The bellows at least covers the end of the outer tube through which the inner tube passes.

[0015] Furthermore, to facilitate the fixing of the corrugated pipe, the corrugated pipe is secured to the outer periphery of the outer and inner pipes with cable ties.

[0016] Furthermore, the peripheral wall of the corrugated pipe has multiple crests and troughs arranged along the X direction. The wall thickness of the corrugated pipe at the crests and troughs is h, and the wall thickness of the corrugated pipe between the crests and troughs is t, and t > h.

[0017] Because the bellows inside the oil circuit requires flame retardancy, the material is generally nitrile rubber. Adding flame retardants makes it relatively hard. Furthermore, in low-temperature environments, the bellows are quite stiff when first started up. If the bellows are of uniform thickness, they are not easily deformed. Frequent hard stretching in winter can easily lead to fatigue cracking. Therefore, in this embodiment, by reducing the thickness of the bellows' crests and troughs, making it thinner than other parts, the thinner bellows are more easily deformed under stress during use, under the same conditions.

[0018] More preferably, t and h also satisfy the following relationship: t = 1.5~2h. If t is less than 1.5h, the thickness ratio is not obvious; if t is greater than 2h, the deformation zone is concentrated in the crests and troughs, and the non-crest and trough areas basically do not participate in the deformation, both of which are unfavorable to the life requirements of the bellows.

[0019] Furthermore, the tail end of the drive mechanism also needs to be sealed against oil. According to one aspect of the present invention, the drive mechanism also includes a motor and a sealing cover opened at the assembly of the motor and the push rod.

[0020] Furthermore, the tail end of the drive mechanism also needs to be sealed against oil. According to another aspect of this utility model, the drive mechanism also includes a motor, an open sealed box, and sealant contained in the sealed box. The motor and the assembly position of the motor and the push rod are immersed in the sealant in the sealed box.

[0021] The technical solution adopted by this utility model to solve the first technical problem mentioned above is: a range hood, including a movable part, characterized in that: the movable part is driven by the drive mechanism for the range hood as described above.

[0022] Compared with the prior art, the advantages of this utility model are: by making the bellows in a compressed state when the push rod of the drive mechanism is in the initial state without being extended, the bellows can be stretched to a natural state first when the push rod of the drive mechanism is extended, and then stretched. Thus, during the entire stroke, the elongation ratio of the bellows 33 can be reduced compared to the bellows in the initial natural state, increasing the life of the bellows and ensuring the normal operation of the drive mechanism. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the range hood according to the first embodiment of the present utility model;

[0024] Figure 2 This is a cross-sectional view of the range hood according to the first embodiment of this utility model;

[0025] Figure 3 This is a schematic diagram of the drive mechanism of the range hood according to the first embodiment of the present utility model;

[0026] Figure 4 This is an exploded structural diagram of the drive mechanism of the range hood according to the first embodiment of the present utility model;

[0027] Figure 5 This is a cross-sectional side view of the drive mechanism of the range hood according to the first embodiment of the present utility model;

[0028] Figure 6 for Figure 5 A magnified schematic diagram of part I;

[0029] Figure 7 This is a schematic diagram of the drive mechanism of the range hood according to the second embodiment of the present invention;

[0030] Figure 8This is a schematic diagram of the assembly gap of the drive mechanism of the range hood according to the second embodiment of the present invention;

[0031] Figure 9 This is an exploded structural diagram of the drive mechanism of the range hood according to the second embodiment of the present invention. Detailed Implementation

[0032] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0033] 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," and "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. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Since the embodiments disclosed in this utility model can be arranged in different directions, these terms indicating direction are only for illustration 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. In addition, features defined with "first" and "second" may explicitly or implicitly include one or more of such features.

[0034] Example 1

[0035] See Figures 1-6 A range hood includes a lower housing 1 for drawing in cooking fumes, an upper housing 2 disposed above the lower housing 1, and a drive mechanism 3 disposed within the upper housing 2. The range hood also includes movable parts, such as a smoke baffle 4 disposed on the front of the lower housing 1, and the drive mechanism 3 is used to drive the smoke baffle 4 to flip. A fan 5 is disposed within the upper housing 2, and the drive mechanism 3 corresponds to a position of the fan 5 near the bottom. Alternatively, the lower housing 1 may have a flip-open air inlet plate, which the drive mechanism 3 drives to move; or, the range hood may also be a top-mounted range hood, in which the drive mechanism 3 drives a baffle plate under the smoke collection hood. The range hood simply needs to have movable parts, and the drive mechanism 3 needs to be located within the fume duct.

[0036] The drive mechanism 3 is an electric push rod, including a motor 31 and a push rod 32. The push rod 32 includes an outer tube 321 and an inner tube 322. One end of the inner tube 322 extends into the outer tube 321, while the other end is located outside the outer tube 321 for connection to a transmission component or load. When the motor 31 starts, it drives the inner tube 322 to move linearly (telescopically) relative to the outer tube 321. The direction of movement can be found in [reference needed]. Figure 5As indicated by the middle arrow X.

[0037] Since the drive mechanism 3 is located in the oil circuit, an oil-proof bellows 33 is fitted around the outer periphery of the push rod 32. One end of the bellows 33 is fixed to the portion of the inner tube 322 that protrudes from the outer tube 321, while the other end of the bellows 33 is fixed to the outer tube 321. The bellows 33 at least covers the end of the outer tube 321 through which the inner tube 322 passes. The bellows 33 can be secured to the outer periphery of the outer tube 321 and the inner tube 322 at the connection points with the outer tube 321 and the inner tube 322 using cable ties 34. Thus, during the extension and retraction of the inner tube 322 relative to the outer tube 321, the bellows 33 will extend and retract accordingly. When the inner tube 322 extends relative to the outer tube 321, it causes the end of the bellows 33 connected to it to extend, and the bellows gradually unfolds. During the closing process, the inner tube 322 retracts into the outer tube 321, causing the bellows 33 to return to its natural state, finally reaching a compressed state, completing the entire stroke.

[0038] As described above, in the initial state of the inner tube 322's contraction, the bellows 33 is in a compressed state, meaning the bellows 33 is pre-shrink assembled. This reduces the bellows 33's expansion / contraction ratio, decreases its deformation, and prevents it from tearing. If the length of the bellows 33 is L, its natural length is denoted as L0 (the natural length after mold forming). The minimum length of the bellows 33 assembled on the push rod 32 is Lmin, and the maximum length of the bellows 33 after extending with the inner tube 322 is Lmax. During assembly, the bellows 33 is first fitted onto the push rod 32, then the head is secured to the inner tube 322 with cable ties 34, and then the tail is secured to the outer tube 321 with cable ties 34. At this point, the bellows' length is compressed from L0 to Lmin. When the inner tube 322 reaches its furthest point, the bellows 33 stretches from Lmin to Lmax, and vice versa when retracting. Taking the electric push rod used in one of the applicant's models as an example, during compression assembly, L0 = 1.5Lmin, and the preload of the bellows 33 is 0.5 times its natural length. During operation and extension, Lmax = 1.5L0 = 2.25Lmin, and the bellows 33 is stretched by 0.5 times from its natural state. Throughout the process, the stroke of the push rod 32 is Lmax - Lmin = 1.5L0 - 2 / 3L0 ≈ 0.83L0, which greatly reduces the elongation ratio of the bellows 33 and increases the service life of the bellows 33.

[0039] The bellows 33 has multiple crests 331 and troughs 332 arranged along the X-direction on its peripheral wall. During the entire movement, the main deformation area of ​​the bellows 33 is at the crests 331 and troughs 332. The crests 331 are mainly elongated, while the troughs 332 mainly participate in the functions of expansion, contraction, and folding. Furthermore, the bellows 33 needs to be flame-retardant in the oil circuit, and the material is generally nitrile rubber, which, after adding flame retardants, will generally become harder. In addition, in low-temperature environments, the bellows 33 is relatively hard when first started up, and if the bellows is of uniform thickness, it is not easy to deform. Frequent hard stretching in winter can easily lead to fatigue cracking. Therefore, in this embodiment, by reducing the thickness of the crests 331 and troughs 332 of the bellows 33, the thinned bellows 33 is more easily deformed under stress during use, under the same conditions. The wall thickness of the corrugated pipe 33 at the crest 331 and trough 332 is h, and the wall thickness of the portion of the corrugated pipe 33 between the crest 331 and trough 332 is t, satisfying t > h, and especially needing t = 1.5 to 2h. If t is less than 1.5h, the thickness ratio is not significant; if t is greater than 2h, the deformation zone is entirely concentrated at the crest 331 and trough 332, and the non-crest and trough areas basically do not participate in deformation, both of which are detrimental to the life requirements of the corrugated pipe.

[0040] The above mainly describes the sealing between the outer tube 321 and the inner tube 322 of the push rod 32. However, after the entire tail end of the drive mechanism 3 (the end opposite the telescopic end of the inner tube 322, i.e., the assembly point of the push rod 32 and the motor 31) is assembled, if no sealing ring is added at the assembly point, there will be assembly gaps, ranging from 0 to 0.3 mm. The oil-water mixture in the oil circuit will flow into the drive mechanism 3 along these gaps, causing corrosion of internal structural components such as the worm gear and bearings, resulting in functional problems with the drive mechanism 3. Therefore, the tail end of the drive mechanism 3 in the oil circuit also needs to be sealed.

[0041] Since the output shaft of the motor 31 is perpendicular to the X-direction, meaning the drive mechanism 3 is L-shaped overall, it is not possible to use nitrile rubber integrated with the bellows 33 for assembly and sealing. Therefore, the drive mechanism 3 also includes a sealing cover 35, which is placed at the assembly point of the motor 31 and the push rod 32. The sealing cover 35 is also made of nitrile rubber and is secured with cable ties after installation.

[0042] The lower housing, smoke baffle 4, and fan 5 mentioned above can all be controlled by a voice module. A controller, a voice receiving module, and a voice parsing module can be installed on the range hood. The voice receiving module receives user commands, and the voice parsing module parses the commands. Based on the parsed commands, the controller controls the corresponding drive mechanisms of the lower housing, smoke baffle 4, and fan 5 to perform corresponding operations, thereby realizing intelligent control of the range hood and improving the user experience.

[0043] Example 2

[0044] See Figures 7-9 In this embodiment, the difference from the first embodiment is that the drive mechanism 3 also includes an open sealed box 36 containing sealant 37. The assembly position of the motor 31 and the push rod 32 is no longer sealed with a sealing cover 35. Instead, the entire assembly position of the motor 31 and the push rod 32 is immersed in the sealant 37 inside the sealed box 36, and the liquid level of the sealant 37 is higher than the assembly position of the motor 31 and the push rod 32 to ensure that there are no dead corners in the seal.

[0045] Since all liquids have fluidity, the gaps 38 between assembled parts that need to be sealed cannot be too large. See [reference needed]. Figure 8 The gap 38 has a depth of d and a width of w, and satisfies: 0≤w / d≤0.5 and w≤1.5mm.

[0046] The advantage of using this impregnation method in this embodiment is that it avoids some gaps being missed. However, there are requirements for the consistency (penetration) of sealant 37: the value is usually within the range of ASTM D2202 Type II, or the ISO2137 penetration value is approximately between 200 and 300 (0.1 mm).

[0047] Alternatively, sealant can be sprayed or manually applied to gaps and assembly joints.

Claims

1. A drive mechanism for a range hood, comprising: A push rod (32), comprising an outer tube (321) and an inner tube (322) capable of extending and retracting relative to the outer tube (321) in the X direction; and The corrugated pipe (33) is fixed at its two opposite ends along the X direction to the outer pipe (321) and the inner pipe (322), respectively; Its features are: When the inner tube (322) is in a contracted state relative to the outer tube (321), the bellows (33) is in a compressed state.

2. The drive mechanism for a range hood according to claim 1, characterized in that: One end of the corrugated pipe (33) is fixed to the portion of the inner pipe (322) that protrudes from the outer pipe (321), and the other end of the corrugated pipe (33) is fixed to the outer pipe (321). The corrugated pipe (33) at least covers the end of the outer pipe (321) through which the inner pipe (322) passes.

3. The drive mechanism for a range hood according to claim 2, characterized in that: The corrugated pipe (33) is secured to the outer periphery of the outer pipe (321) and the inner pipe (322) by cable ties (34).

4. The drive mechanism for a range hood according to any one of claims 1 to 3, characterized in that: The corrugated pipe (33) has multiple crests (331) and troughs (332) arranged along the X direction on its peripheral wall. The wall thickness of the corrugated pipe (33) at the crests (331) and troughs (332) is h, and the wall thickness of the corrugated pipe (33) between the crests (331) and troughs (332) is t, and t > h.

5. The drive mechanism for a range hood according to claim 4, characterized in that: t and h also satisfy the following relationship: t = 1.5 ~ 2h.

6. The drive mechanism for a range hood according to any one of claims 1 to 3, characterized in that: The drive mechanism also includes a motor (31) and a sealing cover (35) located at the assembly point of the motor (31) and the push rod (32).

7. The drive mechanism for a range hood according to any one of claims 1 to 3, characterized in that: The drive mechanism also includes a motor (31), an open sealed box (36), and sealant (37) contained in the sealed box (36), wherein the motor (31) and the assembly position of the motor (31) and the push rod (32) are immersed in the sealant (37) in the sealed box (36).

8. A range hood, comprising movable parts, characterized in that: The movable component is driven by a drive mechanism for a range hood as described in any one of claims 1 to 7.

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