CN102635887B - Extractor hood with function of reducing vibration and noise - Google Patents

Abstract

The invention relates to the technical field of machinery, in particular to a shock-absorbing and noise-reducing range hood, in which a noise-absorbing and shock-absorbing device is used to connect the connection surface between the volute of the turbine assembly and the range hood casing; The shock device adopts a stepped convex structure rubber body with an upper and a lower platform, and a cylindrical groove is longitudinally arranged in the middle of the stepped convex structure rubber body from the upper platform downward, and the bottom of the cylindrical groove is located in the lower platform. A metal threaded connector is embedded in the cylindrical groove, and a stepped convex structure rubber body outside the metal threaded connector is also provided with a metal support skeleton; The screw fixing parts between the range hood casings are connected by a special noise-absorbing and shock-absorbing device with damping characteristics, and the rigid connection between them is changed into a damping elastic connection, which fundamentally changes the range hood casing. Condition of vibration.

Description

A range hood with shock and noise reduction

technical field

The invention relates to the technical field of machinery, in particular to a shock-absorbing and noise-reducing range hood.

Background technique

At present, when the range hood is working, since the motor drives the turbine to run, the body of the range hood will generate vibration and noise at a certain frequency. The reason is that the motor is a moving part. Due to the manufacturing error of the parts, it will definitely produce periodic vibrations during operation. Similarly, when the turbine runs under the drive of the motor, it will also produce periodic vibrations. The assembly composed of the motor and the turbine, and the connection between the assembly and the body of the range hood are all connected by screws, and some rubber or other materials are added to the joint part. When the screws are locked, the hardness is very high after compression. High rubber or other material gaskets can no longer play the role of shock absorption. And in all such structures, the screws are directly connected to the two parts, which is a rigid connection without any shock-absorbing parts in the middle. In this way, the periodic vibration of the motor will be transmitted to the whole body of the range hood, and together they will vibrate and cause noise.

Contents of the invention

The purpose of the present invention is to overcome the deficiencies of the prior art by adopting a special noise-absorbing and shock-absorbing device, which is arranged at the screw connection part between the volute of the turbine assembly and the range hood casing to eliminate noise.

In order to achieve the above purpose, a range hood with shock absorption and noise reduction is designed, which includes a range hood casing, a motor, a turbine assembly, screws, and a gasket, and is characterized in that: the connection between the volute of the turbine assembly and the range hood casing The surface is connected by a noise-absorbing and shock-absorbing device; the noise-absorbing and shock-absorbing device adopts a stepped convex structure rubber body with upper and lower tables, and in the middle of the stepped convex structure rubber body, a Cylindrical groove, the bottom of the cylindrical groove is located in the lower table, a metal threaded connector is embedded in the cylindrical groove, and a metal support frame is also provided in the body of the stepped convex structure rubber body outside the metal threaded connector. Composition; the metal support frame adopts a Z-shaped metal support frame or a hat-shaped metal support frame with holes on the top surface, and the upper plane of the Z-shaped metal support frame or the top surface of the hat-shaped metal support frame is located in the upper table to form a metal support On the supporting surface of the frame, the lower plane of the Z-shaped metal supporting frame or the brim part of the bottom of the hat-shaped metal supporting frame is located in the lower table to form the lower supporting surface of the metal supporting frame. Through the screw hole on the lower support surface of the metal support frame; the lower table is assembled on the volute through the screw hole with a fixing piece, and the other fixing piece is screwed from the outside of the range hood casing to the metal threaded connection piece inside the noise reduction and shock absorption device ; The step-type convex structure rubber body is also provided with structural holes along the horizontal direction from front to back, and the step-type convex structure rubber body adopts a rectangular boss rubber body or a circular boss For the rubber body, the structural holes set on the rectangular boss rubber body are three square structural holes centered on the upper table between the two Z-shaped metal support skeletons of the rectangular boss rubber body. Two structural holes form a "pin" shape. The two boundaries of the upper structural hole are respectively located under the upper plane of the left and right Z-shaped metal support skeletons. The lower two structural holes are respectively located on both sides of the metal threaded connector, and the lower The height of the bottom surface of the two structural holes is not lower than the height of the upper surface of the lower platform of the stepped convex structure rubber body; the structural hole set on the circular boss rubber body is the upper platform in the hat-shaped metal support frame There are three square structural holes in the middle of the top, and the three structural holes form a "pin" shape. The length of the upper structural hole is greater than the diameter of the hole set on the top surface of the hat-shaped metal support frame. Both sides of the threaded connection, and the height of the bottom surface of the two lower structural holes is not lower than the height of the upper surface of the lower platform of the stepped convex structure rubber body.

A Z-shaped metal support frame is respectively arranged on the left and right sides of the rectangular boss rubber body. The Z-shaped metal support frame uses a Z-shaped metal plate, and two Z-shaped metal plates are symmetrically located on both sides of the metal threaded connector. , and the two Z-shaped metal plates respectively fit the Z-shaped curved surfaces of the left and right side walls of the rectangular boss rubber body.

A hat-shaped metal support framework is set in the circular boss rubber body, and the hat-shaped metal support framework surrounds the outer circumference of the metal threaded connector, and the top of the metal threaded connector is located in the hole on the top of the hat-shaped metal support framework.

The metal threaded connector is a cylinder with a ring-shaped brim on the outer edge of the bottom, and a threaded connection hole in the middle of the cylinder along the longitudinal direction.

The rubber body with stepped convex structure is formed by kneading nitrile rubber, butadiene rubber and silica gel.

A gasket is also provided on the connection surface between the turbine assembly outside the noise damping and shock absorbing device and the range hood casing.

A groove is also arranged on the bottom surface of the stepped convex structure rubber body.

Compared with the prior art, the present invention adopts a special sound-absorbing and shock-absorbing device with damping characteristics to connect the screw fixing part between the turbine assembly and the range hood casing, and changes the rigid connection between them into a damping elastic connection, Fundamentally changed the situation that the range hood casing vibrates with the operation of the motor. the

Description of drawings

Fig. 1 is the front view of the noise elimination and shock absorption device in the present invention.

Fig. 2 is a schematic diagram of a three-dimensional structure of a rectangular sound-absorbing and shock-absorbing device in the present invention.

Fig. 3 is a top view of the noise damping and shock absorbing device shown in Fig. 2 .

Fig. 4 is a sectional view of the noise reduction and shock absorbing device shown in Fig. 2 .

Fig. 5 is a schematic diagram of the size of a rectangular sound attenuation and shock absorption device in an embodiment of the present invention.

Fig. 6 is a schematic diagram of another three-dimensional structure of the rectangular sound-absorbing and shock-absorbing device in the present invention.

Fig. 7 is a top view of the circular sound attenuation and shock absorption device in the present invention.

Fig. 8 is a B-B sectional view of the noise reduction and shock absorbing device shown in Fig. 7 .

Fig. 9 is a partial side view of the combination of the turbine assembly and the range hood casing in the present invention.

Fig. 10 is a right side view of Fig. 9 .

Fig. 11 is a three-dimensional structural schematic diagram of a turbine assembly in a side view of the present invention.

Fig. 12 is a schematic perspective view of the front view of the turbine assembly in the present invention.

Detailed ways

The present invention will be further described now in conjunction with accompanying drawing.

Referring to Figures 1 to 12, in the present invention, where the volute 4 of the turbine assembly and the range hood casing 3 are connected by screws, the combined connection of the noise reduction and shock absorbing device 1 and the screws is used instead. That is, the connecting surface between the volute 4 of the turbine assembly and the range hood casing 3 is connected by a noise reduction and shock absorption device 1; the noise reduction and shock absorption device 1 adopts a stepped convex rubber body with upper and lower platforms , and in the middle of the stepped convex structure rubber body, a cylindrical groove is longitudinally provided downward from the upper table, the bottom of the cylindrical groove is located in the lower table, and a metal threaded connector 6 is embedded in the cylindrical groove. The threaded connector 6 is a cylinder with an annular brim on the outer edge of the bottom, and a threaded connection hole is longitudinally provided in the middle of the cylinder. The body of the stepped convex structure rubber body outside the metal threaded connector 6 is also composed of a metal support frame 7; the metal support frame 7 adopts a Z-shaped metal support frame or a hat-shaped metal support with holes on the top surface. Skeleton, the upper plane of the Z-shaped metal support skeleton or the top surface of the hat-shaped metal support skeleton is located in the upper part of the upper table to form the upper support surface of the metal support skeleton, the lower plane of the Z-shaped metal support skeleton or the cap at the bottom of the hat-shaped metal support skeleton The lower support surface of the metal support frame is formed along the upper part of the lower table surface, and the screw hole 7-1 passing through the lower support surface of the metal support frame is provided on the lower table surface of the stepped convex structure rubber body; the fixing piece is used to pass through the screw hole 7-1 Fix and assemble the lower table of the noise reduction and shock absorption device 1 on the volute 4, and the other fixing part connects from the outside of the range hood casing 3 to the threaded connection hole of the metal threaded connector 6 in the noise reduction and shock absorption device 1. Threaded connection, so as to realize the connection between the turbine assembly and the range hood casing 3 . The rubber body with a stepped convex structure adopts a rectangular boss rubber body or a circular boss rubber body, that is, when the upper and lower tables of the stepped convex structure rubber body are rectangular, and the upper and lower tables are The front and rear sides of the rubber body are respectively located on the same vertical plane, and when the length of the upper table is smaller than the length of the lower table, a rectangular convex rubber body is formed; when the upper and lower tables of the stepped convex structure rubber body are concentric circles up and down , and when the radius of the upper mesa is smaller than the radius of the lower mesa, a circular boss rubber body is formed. When the rectangular boss rubber body is used, a rectangular sound-absorbing and shock-absorbing device can be formed; when a circular boss rubber body is used, a circular sound-absorbing and shock-absorbing device can be formed. The rubber body with stepped convex structure is formed by kneading nitrile rubber, butadiene rubber and silica gel.

Referring to Figures 2 to 6, when the rubber body with a stepped convex structure adopts a rectangular boss rubber body, a Z-shaped metal support frame is respectively arranged on the left and right sides of the rectangular boss rubber body, and the Z-shaped metal support The framework adopts Z-shaped metal plates, and two Z-shaped metal plates are symmetrically located on both sides of the metal threaded connector 6, and the two Z-shaped metal plates respectively fit the Z-shaped curved surfaces of the left and right side walls of the rectangular boss rubber body.

Referring to Figures 7 to 8, when the stepped convex structure rubber body adopts a circular boss rubber body, a hat-shaped metal support frame is set in the circular boss rubber body, and the hat-shaped metal support frame is surrounded by metal threads. The outer circumference of the connecting piece 6, the top of the metal threaded connecting piece 6 is located in the hole at the top of the hat-shaped metal supporting frame.

The rubber body with stepped convex structure is provided with structural holes 9 along the horizontal direction from front to rear, see FIG. 1 . In this way, when the noise damping and shock absorbing device is squeezed, when the metal supporting frame 7 and the metal threaded connector 6 play most of the supporting force, the structural holes will also disperse a certain amount of squeezing force.

When the rectangular boss rubber body is used, the structural holes set on the rectangular boss rubber body are as follows: three Square structural holes, three square structural holes form a "pin" shape, the two boundaries of the upper structural hole are respectively located under the upper plane of the left and right Z-shaped metal support skeletons, and the lower two structural holes are respectively located on the metal thread Both sides of the connector 6, and the height of the bottom surface of the two structural holes below is not lower than the height of the upper surface of the lower platform of the stepped convex structure rubber body; A screw hole 7-1 is respectively arranged on both sides, see Fig. 2, Fig. 4, Fig. 5, Fig. 6.

When a circular boss rubber body is used, the structural holes set on the circular boss rubber body are three square structural holes centered on the upper table in the hat-shaped metal support frame, and the three structural holes Form a "product" shape, the length of the upper structural hole is greater than the diameter of the hole set on the top surface of the hat-shaped metal support frame, the lower two structural holes are respectively located on both sides of the metal threaded connector 6, and the lower two structural holes The height of the bottom surface is not lower than the height of the upper surface of the lower platform of the stepped convex structure rubber body; and in this example, three screw holes 7-1 are evenly distributed on the lower surface of the circular convex rubber body, see Fig. 8.

Considering that the size, shape and position of the structural hole are different in the present invention, the stiffness of the noise reduction and shock absorbing device 1 is all different. If the stiffness is too large, the effective area of damping will be too small, and the damping effect will be weakened. If the stiffness is too small, it will Produces excessive compression. The noise-absorbing and shock-absorbing device 1 generally controls the Z-direction compression to 2-3mm, and the X- and Y-directions to 1.5-2mm, and can automatically limit the protection when subjected to a relatively large impact. Taking the actual structure of a rectangular sound-absorbing and shock-absorbing device as an example, the total height of the generally stepped convex structure rubber body is set to 20mm, of which the height of the lower table is 8mm, the width of the lower table is 70mm, and the width of the upper table is The thickness of the two metal support frames 7 is 1.5 mm, the distance between the upper planes of the two metal support frames 7 is 17 mm, and the diameter of the bottom of the metal threaded connector 6 is 29 mm. The width of the upper structural hole is set to 24mm, the height of the upper structural hole is 3.2mm, and the distance between the bottom of the upper structural hole and the bottom of the stepped convex structure rubber body is 13mm; the lower two structural holes are set correspondingly, and the lower The distance between the two structural holes is 16mm. The width of the lower two structural holes is 8mm and the height is 2.3mm respectively. The distance between their bottoms and the bottom of the stepped convex structure rubber body is 8mm.

There is also a groove 1-1 on the bottom surface of the stepped convex structure rubber body, so that when the noise reduction and shock absorbing device 1 is squeezed, the groove structure can also further buffer and disperse a certain pressure, see Figure 6, in When the noise-absorbing and shock-absorbing device 1 adopts a rectangular stepped convex rubber body, the groove 1-1 may be in the shape of an isosceles trapezoid. When the noise reduction and shock absorbing device 1 adopts a circular stepped convex rubber body, the groove 1-1 can be arranged in the middle of the bottom surface of the stepped convex rubber body in a conical shape.

Referring to Figures 9 to 12, the weight of the entire range hood system in this example includes the motor, turbine assembly, connecting screws, gaskets, etc., and the total weight is 6.0kg. The part where the volute 4 in the turbine assembly is connected to the range hood casing 3 is mainly at the air duct opening connecting surface 4-1 of the volute, and near the bottom of the front of the volute. Wherein the connecting surface 4-1 of the air duct opening of the volute is in the shape of a square frame, and a noise-absorbing and shock-absorbing device 1 is respectively provided on the four sides of the connecting surface of the square frame, and in the inside of the connecting surface of the square frame The ring is also provided with a gasket 2, and the material of the gasket 2 can be made of materials such as foamed rubber or foamed PU or foamed EVA or foamed EPDM with high compressibility characteristics. In this example, the gasket The thickness of 2 is slightly higher than the height of the noise reduction and shock absorbing device, and the compression displacement of the gasket is greater than 5mm, which can effectively ensure the sealing between the turbine assembly and the range hood casing; The connection of the front panel of the shell is also connected by a noise-absorbing and shock-absorbing device.

The technical parameters of the noise reduction and shock absorbing device 1 in this example are:

Rated load: 1.5KG;

Natural frequency under rated load: 10±2Hz;

Damping ratio C/Cc: 0.09;

Static deformation under rated load: 2~3mm;

Destruction load: ≥15 times the rated load.

When fasteners such as screws are used to directly connect the turbine assembly and the range hood casing, the overall noise of the range hood is 75db, and the casing vibrates significantly. After adopting the noise reduction and shock absorbing device of the present invention, the overall noise of the range hood is 62db, and the casing has almost no vibration.

Claims (7)

1. A range hood with shock and noise reduction, comprising a range hood casing, a motor, a turbine assembly, screws, and a gasket, characterized in that: the volute (4) of the turbine assembly and the range hood casing (3) The connecting surfaces of the two are connected by a noise-absorbing and shock-absorbing device (1); the above-mentioned noise-absorbing and shock-absorbing device (1) adopts a stepped convex structure rubber body with upper and lower tables, and the stepped convex structure rubber body In the middle, a cylindrical groove is arranged longitudinally downward from the upper table, and the bottom of the cylindrical groove is located in the lower table, and a metal threaded connector (6) is embedded in the cylindrical groove, and a stepped groove outside the metal threaded connector (6) The body of the rubber body with a convex structure is also composed of a metal support frame (7); the metal support frame (7) adopts a Z-shaped metal support frame or a hat-shaped metal support frame with holes on the top surface, and the Z-shaped metal support frame The upper plane of the frame or the top surface of the hat-shaped metal support frame is located in the upper table to form the upper support surface of the metal support frame, and the lower plane of the Z-shaped metal support frame or the brim part of the bottom of the hat-shaped metal support frame is located in the lower table to form a metal support frame. On the lower support surface of the support frame, screw holes (7-1) passing through the lower support surface of the metal support frame are provided on the lower platform of the stepped convex structure rubber body; the lower platform adopts fixing pieces to pass through the screw holes (7-1) Assembled on the volute (4), the other fixing piece is screwed to the metal threaded connecting piece (6) inside the noise reduction and shock absorbing device (1) from the outside of the range hood casing (3); the stepped convex The structural rubber body is also provided with structural holes (9) along the horizontal direction from front to rear, and the stepped convex structural rubber body adopts a rectangular boss rubber body or a circular boss rubber body. The structural holes set on the rectangular boss rubber body are three square structural holes centered on the upper table between the two Z-shaped metal support skeletons of the rectangular boss rubber body. Forming a "pin" shape, the two boundaries of the upper structural holes are respectively located under the upper planes of the left and right Z-shaped metal support skeletons, and the lower two structural holes are respectively located on both sides of the metal threaded connector (6), and the lower The height of the bottom surface of the two structural holes is not lower than the height of the upper surface of the lower platform of the stepped convex structure rubber body; the structural hole set on the circular boss rubber body is the upper platform in the hat-shaped metal support frame There are three square structural holes in the middle of the top, and the three structural holes form a "pin" shape. The length of the upper structural hole is greater than the diameter of the hole set on the top surface of the hat-shaped metal support frame. Both sides of the threaded connector (6), and the height of the bottom surface of the two lower structural holes is not lower than the height of the upper surface of the lower platform of the stepped convex structure rubber body. 2. A shock-absorbing and noise-reducing range hood as claimed in claim 1, characterized in that: Z-shaped metal support frames are respectively arranged on the left and right sides of the rectangular boss rubber body, and the Z-shaped metal supports The support frame adopts Z-shaped metal plates, and two Z-shaped metal plates are symmetrically located on both sides of the metal threaded connector (6), and the two Z-shaped metal plates respectively fit the Z-shaped sides of the left and right sides of the rectangular boss rubber body. curved surface. 3. A shock-absorbing and noise-reducing range hood as claimed in claim 1, characterized in that: a cap-shaped metal support frame is set in the circular boss rubber body, and the cap-shaped metal support frame is surrounded by metal threaded connectors (6), the top of the metal threaded connector (6) is located in the hole at the top of the hat-shaped metal support frame. 4. A range hood with shock and noise reduction according to claim 1, characterized in that: said metal threaded connector (6) is a cylinder with a ring-shaped brim on the outer edge of the bottom, and the middle of the cylinder is A threaded connection hole (6-1) is provided longitudinally. 5 . The range hood with shock and noise reduction as claimed in claim 1 , wherein the rubber body with stepped convex structure is made by kneading nitrile rubber, butadiene rubber and silica gel. 6 . 6. A range hood with shock and noise reduction according to claim 1, characterized in that: on the connecting surface between the turbine assembly outside the noise reduction and shock absorbing device (1) and the range hood casing (3), there is A gasket (2) is provided. 7. The shock-absorbing and noise-reducing range hood according to claim 1, characterized in that: a groove (1-1) is also provided on the bottom surface of the rubber body with a stepped convex structure.