Air outlet cover for range hood and range hood

Abstract

The utility model relates to a range hood and an air outlet cover for the range hood, and the air outlet cover for the range hood comprises a cover body provided with an air outlet; the connecting ring is arranged at the air outlet of the cover body; the cover body and the connecting ring are sleeved with the locking sleeve, and the locking sleeve is detachably connected with the cover body and the connecting ring; a first thread is arranged on the inner circumferential wall of the locking sleeve, and a second thread which can be in threaded connection with the first thread is arranged on the outer circumferential wall of the cover body; the screw is characterized in that the first thread is provided with an arc tooth-shaped surface, and the second thread is provided with an arc surface which can abut against the arc surface on the first thread. The utility model has the advantages that: the stress between each thread is more uniform, the axial forces of different threads are more uniform step by step, the force in the normal direction of the thread surface is enhanced, the frictional resistance is further increased, the loosening caused by vibration and the like in the operation process of the fan is prevented, and the quick disassembly and assembly are convenient.

Description

TECHNICAL FIELD

[0001] The utility model relates to a smoke purification technical field, especially a kind of air outlet cover for range hood and range hood. BACKGROUND

[0002] The air outlet cover of range hood has the effect of gas aggregation and flow guiding, and the oil fume enters the smoke exhaust pipe through the air outlet cover and is discharged through the smoke exhaust pipe.

[0003] The Chinese utility model patent with patent No.ZL202221537308.6 (authorized announcement No.CN218096114U) of the applicant's prior application discloses an air outlet cover for range hood and range hood applying the air outlet cover, and the air outlet cover comprises a cover body, a connecting ring and a locking sleeve; one of the inner peripheral wall of the locking sleeve and the outer peripheral wall of the cover body is provided with a first thread, and the other is provided with a second thread threadedly connected with the first thread; the first thread is a non-equidistant thread; and the second thread is an equidistant thread.

[0004] Although the above-mentioned air outlet cover can provide greater axial pre-tightening force by setting the non-equidistant first thread and the equidistant second thread, compared with the ordinary equidistant thread connection pair, only 1-2 threads have pressure, and the above-mentioned air outlet cover can distribute the pre-tightening force to different thread segments, more evenly, thereby providing better anti-loosening effect. However, the above-mentioned air outlet cover has the following use limitations: since the first thread is a non-equidistant thread and the second thread is an equidistant thread, when the first thread and the second thread are assembled, it is difficult to threadedly connect due to misalignment, so assembly has certain difficulty; and after disassembly and assembly for many times, the threads are gradually worn, so that the anti-loosening effect decreases. Therefore, the prior art needs to be further improved. UTILITY MODEL CONTENTS

[0005] The first technical problem to be solved by the utility model is to provide an air outlet cover for range hood, which is uniformly stressed, simple to assemble and has small wear.

[0006] The second technical problem to be solved by the utility model is to provide a range hood applying the above-mentioned air outlet cover.

[0007] The technical scheme adopted by the utility model to solve the above-mentioned first technical problem is as follows: an air outlet cover for range hood, comprising:

[0008] The cover body has an air outlet;

[0009] The connecting ring is arranged at the air outlet of the cover body;

[0010] The locking sleeve is sleeved outside the cover body and the connecting ring and is detachably connected with the cover body and the connecting ring, respectively;

[0011] The inner circumferential wall of the locking sleeve is provided with a first thread, and the outer circumferential wall of the cover body is provided with a second thread capable of being threadedly connected with the first thread.

[0012] The first thread has a circular arc tooth surface, and the second thread has a circular arc surface capable of abutting against the circular arc surface of the first thread.

[0013] In order to avoid that the angle is too small to make the change of load distribution and the direction of normal force not obvious, and the angle is too large to easily cause too much thread tooth cutting, the strength under axial force is reduced, the included angle between the circular arc tooth surface of the first thread and the circular arc surface of the second thread is α, and α ∈ [5°, 40°].

[0014] Preferably, the α = 31°.

[0015] In order to avoid that the ratio is too small to easily cause the first thread on the locking sleeve to form a sharp point, and repeated disassembly and assembly is easy to damage; and the ratio is too large to easily weaken the adaptability to multi-angle cooperation; the radius of the circular arc tooth surface of the first thread is r, the radius of the circular arc surface of the second thread is R, and r / R ∈ [0.01, 0.25].

[0016] In order to improve the fastening force, the first thread comprises at least two groups of first thread units which are circumferentially and spaced apart along the inner circumferential wall of the locking sleeve, the number of thread teeth of each group of first thread units is the same and the number of thread teeth is at least two.

[0017] Preferably, the second thread comprises second thread units which are circumferentially and spaced apart along the outer circumferential wall of the cover body, the number of groups of the second thread units is the same as the number of groups of the first thread units, and each group of the second thread units is threadedly connected with the corresponding first thread unit.

[0018] The technical solution adopted by the utility model to solve the second technical problem is: an oil fume extractor, characterized in that the air outlet cover for the oil fume extractor is applied.

[0019] Compared with the prior art, the utility model has the advantages that because the first thread has the circular arc tooth surface, the second thread has the circular arc surface which can abut against the circular arc surface of the first thread, when the first thread on the locking sleeve is threadedly connected with the second thread on the cover body, the circular arc tooth surface on the first thread is tightly pressed on the circular arc surface of the second thread, the normal force direction of the contact point is changed, the stress between each thread is more uniform, the axial force of different threads is more uniform, the normal direction force of the thread surface is enhanced, the frictional resistance is increased, the vibration during the operation of the fan is prevented from causing loosening, the quick dismounting is facilitated, the die processing is simple, the additional fastening anti-loosening screw is not needed, the service or the consumer can dismount the pipeline for maintenance by oneself, the loosening capacity can be saved after multiple times of dismounting and assembly, and the thread connection mode is simple in assembly and small in wear. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is the installation structure schematic view of the air outlet cover in the embodiment of the utility model;

[0021] Figure 2 It is Figure 1 the sectional view;

[0022] Figure 3 It is Figure 2 the enlarged view of A in the embodiment;

[0023] Figure 4 It is Figure 1 the exploded view. DETAILED DESCRIPTION

[0024] The utility model will be further described in detail in combination with the drawings.

[0025] As Figures 1 to 4 shown, the air outlet cover for the range hood in the embodiment comprises a cover body 1, a connecting ring 2 and a locking sleeve 3.

[0026] The cover body 1 has an air outlet 10; the connecting ring 2 is arranged at the air outlet 10 of the cover body 1; the locking sleeve 3 is sleeved outside the cover body 1 and the connecting ring 2 and is detachably connected with the cover body 1 and the connecting ring 2; the cover body further has an air inlet which can be communicated with the fan frame of the range hood, and of course the connecting ring 2 is used for connecting the smoke exhaust pipe.

[0027] The inner peripheral wall of the locking sleeve 3 is provided with a first thread 31, and the outer peripheral wall of the cover body 1 is provided with a second thread 11 which can be threadedly connected with the first thread 31; as Figure 3 shown, the first thread 31 has a circular arc tooth surface 311 in the embodiment, and the second thread 11 has a circular arc surface 111 which can abut against the circular arc tooth surface 311 of the first thread 31.

[0028] The included angle between the circular arc tooth surface 311 of the first thread 31 and the circular arc surface 111 on the second thread 11 is α, and α ∈ [5°, 40°]. If the angle α is too small, the load distribution and the normal force direction are not obviously changed; if the angle α is too large, the thread tooth is easily cut too much, the strength under the axial force is reduced, and therefore, in the embodiment, preferably, α = 31°.

[0029] In addition, the radius of the circular arc tooth surface 311 of the first thread 31 is r, and the radius of the circular arc surface 111 of the second thread 11 is R. If the ratio of r to R is too small, a sharp point is easily formed on the first thread on the locking sleeve, and the repeated disassembly and assembly is easy to damage; if the ratio is too large, the adaptability to the multi-angle cooperation is easily reduced, and therefore, in the embodiment, r / R ∈ [0.01, 0.25].

[0030] The first thread 31 includes at least two groups of first thread units 312 which are arranged along the inner circumferential wall of the locking sleeve 3 in a circumferential direction, the number of thread teeth of each group of first thread units 312 is the same and is at least two. As shown in FIG. 2, the number of thread teeth of each group of first thread units 312 is three; correspondingly, the second thread 11 includes second thread units 112 which are arranged along the outer circumferential wall of the cover body 1 in a circumferential direction, the number of groups of the second thread units 112 is the same as that of the first thread units 312, and each group of the second thread units 112 is threadedly connected with the corresponding first thread unit 312. Figure 4

[0031] The embodiment also relates to a range hood, and the range hood applies the air outlet cover for the range hood.

[0032] In the embodiment, when the first thread 31 on the locking sleeve 3 is threadedly connected with the second thread 11 on the cover body 1, the circular arc tooth surface on the first thread 31 is tightly pressed on the circular arc surface of the second thread 11, so that the normal force direction of the contact point is changed, thereby making the force between each thread tooth more uniform, and the axial force of different threads is more uniformly stepped. In addition, because the normal angle can be changed with the change of the axial force, that is, with the change of the axial pre-tightening forces N1, N2 and N3, the local deformation of the plastic thread is realized, the multi-angle cooperation is realized with the change of the force on the cooperation surface when the thread is locked and cooperated, so that the meshing points (the circular arc meshing points on both sides of the thread) contacted can still be kept meshed under the small relative rotation, and are not easy to be loosened. The common wedge-shaped or straight-line cooperated thread may be loosened at this time.

[0033] ​Firstly, because of the thread engagement point of the double circular arc contact, the normal direction of the contact point pressure F1, F2 and F3 under the same axial pre-tightening force is much larger than the original scheme. Secondly, because the double circular arc cooperation is provided, the local sharp point of the tooth shape is reduced, and the tooth tip circular arc is slightly in the arc surface of the air outlet cover body, so that the thread tooth tip can be effectively protected, the plastic part is not easy to be damaged, and repeated disassembly and assembly can be realized. Finally, because the axial pre-tightening force is more uniformly distributed in each thread, the pre-tightening force of the first tooth is avoided to be too large, so that the plastic part is not easy to be damaged, and the risk of oil leakage is reduced. The damage of the tooth during repeated disassembly and assembly is reduced.

[0034] The above is only the preferred embodiment of the present application, and it should be pointed out that for ordinary skilled in the art, without departing from the technical principles of the present application, a number of improvements and refinements can be made, and these improvements and refinements should be considered as the protection scope of the present application.

Claims

1. An air outlet cover for a range hood, comprising: a cover body (1) having an air outlet (10); a connecting ring (2) arranged at the air outlet (10) of the cover body (1); a locking sleeve (3) sleeved outside the cover body (1) and the connecting ring (2) and detachably connected with the cover body (1) and the connecting ring (2) respectively; a first thread (31) is arranged on an inner circumferential wall of the locking sleeve (3), and a second thread (11) is arranged on an outer circumferential wall of the cover body (1) and can be threadedly connected with the first thread (31); characterized in that the first thread (31) has a circular arc tooth surface (311), and the second thread (11) has a circular arc surface (111) capable of abutting against the circular arc tooth surface (311) of the first thread (31).

2. The air deflector of claim 1, wherein: An included angle α formed between the circular arc tooth surface (311) of the first thread (31) and the circular arc surface (111) of the second thread (11) is 5° to 40°.

3. The air deflector of claim 2, wherein: The included angle α is 31°.

4. The air deflector of any one of claims 1 to 3, wherein: A radius of the circular arc tooth surface (311) of the first thread (31) is r, and a radius of the circular arc surface (111) of the second thread (11) is R, and r / R is 0.01 to 0.

25.

5. The air deflector of any one of claims 1-3, wherein: The first thread (31) comprises at least two groups of first thread units (312) arranged along the inner circumferential wall of the locking sleeve (3) at intervals in a circumferential direction, and the number of thread teeth of each group of first thread units (312) is the same and is at least two.

6. The air deflector of claim 5, wherein: The second thread (11) comprises second thread units (112) arranged along the outer circumferential wall of the cover body (1) at intervals in a circumferential direction, the number of groups of the second thread units (112) is the same as the number of groups of the first thread units (312), and each group of the second thread units (112) is threadedly connected with the corresponding first thread unit (312) one by one.

7. A range hood characterized by: The air outlet cover for the range hood has the advantages that the first thread (31) and the second thread (11) are threadedly connected, the locking sleeve (3) is detachably connected with the cover body (1) and the connecting ring (2), and the cover body (1), the connecting ring (2) and the locking sleeve (3) are connected together in a detachable manner.

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