Device for testing water absorption rate of sound-absorbing cotton and range hood adopting device

Abstract

The utility model relates to a device for testing the water absorption rate of sound-absorbing cotton and a range hood adopting the device, which are characterized in that the device for testing the water absorption rate of the sound-absorbing cotton comprises a test container for accommodating test water; the test piece is soaked in the test water of the test container; the bracket is used for connecting the test piece and keeping the test piece positioned in the test water; and the weight block is pressed at the top of the test container and enables the test piece to be immersed in the test water all the time. The utility model has the advantages that the test piece is not extruded by the weight block, so that the integrity of the test piece can be ensured to the greatest extent, and the pollution of the test piece caused by the fact that the weight block intrudes into water can be avoided, thereby improving the accuracy of the test result of the test piece and ensuring the performance of the test piece passing the test.

Description

Technical Field

[0001] The utility model relates to a device for testing the performance of sound-absorbing cotton, in particular to a device for testing the water absorption rate of the sound-absorbing cotton and a range hood adopting the sound-absorbing cotton. Background Art

[0002] Sound-absorbing cotton is a common acoustic material, typically made from natural minerals like quartz sand, limestone, and dolomite, melted into glass with chemical raw materials like soda ash and borax. It exhibits excellent sound absorption properties. Applying sound-absorbing cotton to the exhaust duct of a range hood effectively absorbs noise and reduces the sound waves transmitted from the duct, thereby reducing the noise generated by the hood's impeller. Using sound-absorbing cotton can significantly improve the user's cooking experience in the kitchen.

[0003] The water absorption rate of sound-absorbing cotton is a key indicator to measure the quality of sound-absorbing cotton. Even if it is the same piece of sound-absorbing cotton, if the structure changes, its water absorption performance will be very inconsistent. Usually, when doing a water absorption test, a square sample of about 100mm×100mm in size (mass W1) is taken and completely immersed in water at 23±2℃ for 24 hours. After taking it out, it is placed vertically for 24 hours and its weight is weighed as W2. The water absorption rate of the sample is: Water absorption rate = (W2-W1) / W1×100%. During the test, due to the physical properties of the sound-absorbing cotton itself, its density is smaller than the test water, resulting in the sound-absorbing cotton not being able to be completely immersed in water during the test. In addition, when comparing sound-absorbing cotton of different materials and the same structure, due to the different densities of the two, their immersion depth in water will also be different, and the water absorption of the two will also be different, resulting in the inability to accurately test the difference in water absorption between the two.

[0004] Therefore, there are currently two methods to solve the problem that the sound-absorbing cotton cannot be completely immersed in the test water.

[0005] Method 1: During the test, place a heavy object on the sound-absorbing cotton. The heavy object is immersed in the test water and presses the sound-absorbing cotton to the bottom of the container. Figure 6 ; However, since the heavy object is too large, using this method will compress the gaps in the sound-absorbing cotton, resulting in insufficient water absorption; moreover, the heavy object is in direct contact with the sound-absorbing cotton, making the pollution more serious.

[0006] Method 2: During the test, place a heavy object at the bottom of the container and use a fishhook-like device to hook the sound-absorbing cotton to prevent it from floating up. Figure 7 In this method, the weight block is also immersed in the test water, which causes the test water to be contaminated. Moreover, the fishhook device will destroy the structure of the sound-absorbing cotton, and the reliability of the hook is not high, and it will become loose after a period of time.

[0007] In summary, the existing devices for testing sound-absorbing cotton have various problems as described above, which will affect the accuracy of test results and still need to be further improved and perfected. Utility Model Content

[0008] The first technical problem to be solved by the present utility model is to provide a water absorption rate testing device for sound-absorbing cotton that can maximize the integrity of the test piece and ensure the accuracy of the test results in view of the above-mentioned current situation of the prior art.

[0009] The second technical problem to be solved by the present utility model is to provide an oil fume extractor for sound-absorbing cotton that uses the above-mentioned water absorption rate testing device for detection in view of the above-mentioned current situation of the prior art.

[0010] The technical solution adopted by the present utility model to solve the above first technical problem is as follows: A water absorption rate testing device for sound-absorbing cotton, characterized in that the testing device includes

[0011] A test container for containing test water;

[0012] A test piece immersed in the test water of the test container;

[0013] A bracket for connecting the test piece and maintaining the positioning of the test piece in the test water;

[0014] A heavy weight block pressed on the top of the test container and enabling the test piece to be always immersed in the test water.

[0015] In order to ensure the strength and reliability of the bracket and facilitate processing and manufacturing, preferably, the bracket can be an integral part, which includes a top cover, a pressing rod and a bottom cover. Among them, the top cover is arranged above the opening end of the test container, and the heavy weight block is pressed on the top cover; the pressing rod connects the top cover and the bottom cover; a groove is provided on the bottom cover that can match the size of the test piece and is used to accommodate the test piece.

[0016] In order to reduce the influence of the pressure exerted by the heavy weight block on the bracket on the evacuation of the test piece, preferably, at least one water permeable hole is provided on the bottom surface of the groove of the bottom cover that contacts the test piece. The setting of the water permeable hole can effectively reduce the deformation amount when the position of the test piece in the water changes, and further ensure the integrity of the test piece.

[0017] In order to facilitate assembly and processing, preferably, the test piece is square, and correspondingly, the groove is square, and four water permeable holes distributed in a "field" shape are provided on the bottom surface of the square groove.

[0018] Taking into account the flexibility of adjusting the position of the test piece in water, as another preferred embodiment, the bracket can also be a retractable bracket, which includes a retractable part, a pressure rod and a bottom cover, and the retractable part includes a connecting portion and a free portion, wherein the top of the test container is also provided with a top cover, and the top cover is provided with an axial hole for the retractable part to extend out, the connecting portion of the retractable part is slidably connected to the pressure rod, and the free portion of the retractable part is movably arranged in the axial hole.

[0019] As a preference, simply, the bracket is a cylinder, and the finished cylinder is easy to purchase. The cylinder body of the cylinder is the pressure rod, and the piston rod of the cylinder is the telescopic member.

[0020] In order to reduce costs, as another preference, the telescopic part is implemented by a mechanical structure, which includes a telescopic rod and an articulated frame, wherein the articulated frame includes a first articulated rod, a second articulated rod, a third articulated rod and a fourth articulated rod arranged in a quadrilateral, wherein one end of the first articulated rod is hingedly connected to the pressure rod, the other end of the first articulated rod is hingedly connected to one end of the second articulated rod, the other end of the second articulated rod is hingedly connected to the bottom of the top cover, one end of the third articulated rod is hingedly connected to the bottom of the top cover, the other end of the third articulated rod is hingedly connected to one end of the fourth articulated rod, and the other end of the fourth articulated rod is hingedly connected to the top rod; and one end of the telescopic rod is slidably connected to the pressure rod, and the other end of the telescopic rod is threadedly connected to the shaft hole.

[0021] In order to simplify the structure and facilitate disassembly and assembly, it is further preferred that a first connecting piece is provided at the top of the pressure rod, and a second connecting piece is provided at the bottom of the top cover; one end of the first hinged rod and the other end of the fourth hinged rod are respectively hingedly connected to the first connecting piece; the other end of the second hinged rod and one end of the third hinged rod are respectively hingedly connected to the second connecting piece.

[0022] In order to improve the reliability of the connection, it is preferred that there are two first connecting plates and they are arranged parallel to each other at intervals. One end of the first hinged rod and the other end of the fourth hinged rod are respectively inserted into the grooves formed by the two first connecting plates. One end of the first hinged rod and the two first connecting plates, and the other end of the fourth hinged rod and the two first connecting plates are respectively hingedly connected by a fixing member.

[0023] For ease of assembly, preferably, there are two second connecting plates that are spaced apart and arranged in a straight line, the other end of the second hinged rod and one of the second connecting plates are hingedly connected by a fixing member, and one end of the third hinged rod and the other second connecting plate are hingedly connected by a fixing member.

[0024] To reduce the influence of the pressure exerted by the heavy object block on the bracket on the evacuation of the test piece, preferably, at least one water permeable hole is opened on the bottom surface of the groove of the bottom cover that contacts the test piece.

[0025] For the convenience of assembly and processing, preferably, the test piece is square. Correspondingly, the groove is square, and four water permeable holes distributed in a "field" shape are opened on the bottom surface of the square groove.

[0026] For the convenience of the up and down movement of the telescopic rod, preferably, the heavy object block is pressed on the top cover, and a through hole for the telescopic member to extend out is opened on the heavy object block.

[0027] The technical solution adopted by the present utility model to solve the above second technical problem is: an oil fume absorber, including an impeller and a sound absorbing cotton that can reduce the rotation noise of the impeller, and is characterized in that: the sound absorbing cotton is tested for the water absorption rate performance by using the water absorption rate testing device as described above.

[0028] Compared with the prior art, the advantages of the present utility model are as follows: the test piece is fixedly installed on the bracket, and the heavy object block does not directly contact the test piece (sound absorbing cotton). The test piece is not extruded by the heavy object block and is not damaged. It can not only ensure the integrity of the test piece to the greatest extent, but also avoid the heavy object block invading the water and causing the test piece to be polluted, thereby improving the accuracy of the test results of the test piece and ensuring the performance of the test piece passing the test; in addition, the bracket can fix the immersion depth of the test piece in the water, effectively prevent the test piece from floating, and is not easy to unhook and break, making the positioning of the test piece in the water more stable and reliable, which is conducive to the smooth completion of the test experiment. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic assembly structure diagram of the water absorption rate testing device of Embodiment 1 of the present utility model.

[0030] Figure 2 It is a schematic assembly structure diagram of the water absorption rate testing device of Embodiment 2 of the present utility model.

[0031] Figure 3 It is a usage state diagram of the telescopic bracket of Embodiment 2 of the present utility model.

[0032] Figure 4 It is a three-dimensional structure diagram of the pressure rod and the bottom cover of Embodiment 2 of the present utility model.

[0033] Figure 5 It is a three-dimensional structure diagram of the top cover of Embodiment 2 of the present utility model.

[0034] Figure 6 It is one of the schematic structure diagrams of the water absorption rate testing device of the sound absorbing cotton in the prior art.

[0035] Figure 7 It is the second structural schematic diagram of the water absorption rate test device for sound-absorbing cotton in the prior art. Specific embodiments

[0036] The following further describes the present utility model in detail with reference to the embodiments and the attached drawings.

[0037] Embodiment 1 is as Figure 1 、 Figure 4 shown:

[0038] This embodiment discloses a water absorption rate test device for testing the performance of sound-absorbing cotton. The test device includes a test container 1, a test piece 2, a bracket 3 and a heavy weight 4. Among them, the test container 1 is usually a beaker for containing test water 5; the test piece 2 is the sound-absorbing cotton immersed in the test water 5; the bracket 3 is used to connect or fixedly install the test piece 2 and can keep the test piece 2 positioned in the test water 5. To avoid rust, the bracket 3 is usually made of plastic; the heavy weight 4 is generally pressed on the top of the test container 1 to prevent the test piece 2 from floating, so that the test piece 2 can always be immersed in the test water 5.

[0039] To ensure the strength of the bracket 3 and the reliability of the connection, and at the same time facilitate processing and manufacturing, the bracket 3 in this embodiment adopts an integral structure. The cross-section of the bracket 3 is in the shape of a "work" character. The bracket 3 includes an integrally formed top cover 31, a pressure rod 32 and a bottom cover 33. Among them, the top cover 31 can be used as the end cover of the test container 1, and its axis is limited above the opening end of the test container 1, and the heavy weight 4 is pressed on the top cover 31; the pressure rod 32 connects the top cover 31 and the bottom cover 33; a groove 331 that matches the size of the test piece 2 and is used to accommodate the test piece 2 is opened on the bottom cover 33, and the test piece (2) can be exactly embedded in the groove 331 for fixation.

[0040] To reduce the influence of the pressure exerted by the heavy weight 4 on the bracket 3 on the drainage of the test piece 2, at least one water permeable hole 332 can also be opened on the bottom surface of the groove 331 of the bottom cover 33 that contacts the test piece 2. In this embodiment, the test piece 2 is square. Correspondingly, the groove 331 is square, and four water permeable holes 332 distributed in a "field" shape can be opened on the bottom surface of the square groove 331. The shape of the water permeable hole 332 can be seen in Figure 4 , and the setting of the water permeable hole 332 can effectively reduce the deformation amount when the position of the test piece 2 changes in the water, and further ensure the integrity of the test piece 2.

[0041] In this embodiment, if the depth of the test piece 2 in the water needs to be adjusted, it can be achieved by increasing or decreasing the height of the test water 5.

[0042] Embodiment 2 is as Figures 2 to 5 shown,

[0043] The difference between this embodiment 2 and embodiment 1 is that, considering the flexibility of adjusting the position of the test piece 2 in water, the bracket 3 can also adopt a telescopic structure. Specifically, the bracket 3 includes a telescopic member 34, a pressure rod 32 and a bottom cover 33 that can be separated from each other and fixedly connected together;

[0044] like Figure 2-3 As shown, a top cover 31 is further provided on the top of the test container 1. An axial hole 311 is provided on the top cover 31 for exposing the telescopic member 34. The telescopic member 34 includes a connecting portion and a free portion. The connecting portion of the telescopic member 34 is slidably connected to the pressure rod 32, and the free portion of the telescopic member 34 is movably provided in the axial hole 311.

[0045] Simply put, the bracket 3 can directly select a cylinder assembly, and the cylinder piston assembly can be directly used as the telescopic member 34. Specifically, the cylinder body can be used as the pressure rod 32, and the cylinder piston rod can be used as the telescopic member 34. The telescopic member 34 slides vertically along the pressure rod 32, thereby realizing the telescopic function of the bracket 3. The cylinder structure is a mature accessory and will not be described in detail here.

[0046] The telescopic member 34 of this embodiment can also be realized by a mechanical structure. The telescopic member 34 includes a telescopic rod 340 and a hinge frame. Figure 2 、 Figure 3 As shown, the articulated frame includes a first articulated rod 341, a second articulated rod 342, a third articulated rod 343 and a fourth articulated rod 344 arranged in a quadrilateral, wherein one end of the first articulated rod 341 is hingedly connected to the pressure rod 32, the other end of the first articulated rod 341 is hingedly connected to one end of the second articulated rod 342, the other end of the second articulated rod 342 is hingedly connected to the bottom of the top cover 31, one end of the third articulated rod 343 is hingedly connected to the bottom of the top cover 31, the other end of the third articulated rod 343 is hingedly connected to one end of the fourth articulated rod 344, and the other end of the fourth articulated rod 344 is hingedly connected to the top rod; and one end of the telescopic rod 340 is slidably connected to the pressure rod 32, and the other end of the telescopic rod 340 is rotatably arranged in the shaft hole 311 through a threaded connection. Therefore, when the threaded connection of the rotating telescopic rod 340 is connected to the other end of the shaft hole 311, the telescopic rod 340 can drive the articulated frame to realize the changes of compression and stretching of the parallelogram, thereby realizing the lifting and lowering movement of the telescopic rod 340 relative to the pressure rod 32 in the vertical direction, that is, realizing the adjustment of the depth of the test piece 2 in the test water 5.

[0047] To simplify the structure and facilitate disassembly and assembly, a first connecting piece 321 is provided at the top of the pressure rod 32. Correspondingly, a second connecting piece 312 is provided at the bottom of the top cover 31. One end of the first hinge rod 341 and the other end of the fourth hinge rod 344 are respectively hinged to the first connecting piece 321. The other end of the second hinge rod 342 and one end of the third hinge rod 343 are respectively hinged to the second connecting piece 312.

[0048] To improve the reliability of the connection, there are two first connecting pieces 321 which are arranged in parallel at intervals. One end of the first hinge rod 341 and the other end of the fourth hinge rod 344 are respectively inserted into the groove 331 formed by the two first connecting pieces 321. Hinge connections are respectively achieved between one end of the first hinge rod 341 and the two first connecting pieces 321, and between the other end of the fourth hinge rod 344 and the two first connecting pieces 321 through a fixing member.

[0049] Similarly, there are two second connecting pieces 312 which are arranged in a straight line at intervals. To improve the reliability of the connection and facilitate assembly, the second hinge rod 342 and the third hinge rod 343 are respectively of a double-rod structure. One second connecting piece 312 is inserted between the other ends of the two second hinge rods 342, and the three are hinged through a fixing member. The other second connecting piece 312 is inserted between one ends of the two third hinge rods 343, and the three are also hinged through a fixing member.

[0050] To facilitate the up and down movement of the telescopic rod 340, a heavy object block 4 is pressed on the top cover 31. The heavy object block 4 is provided with a through hole 41 for the telescopic member 34 to extend out. <照

[0051] To reduce the influence of the pressure exerted by the heavy object block 4 on the bracket 3 on the evacuation of the test piece 2, at least one water permeable hole 332 is also provided on the bottom surface of the groove 331 of the bottom cover 33 that contacts the test piece 2. In this embodiment, the test piece 2 is square. Correspondingly, the groove 331 on the bottom cover 33 is also square. Four water permeable holes 332 distributed in a "field" shape can be provided on the bottom surface of the square groove 331. Refer to Figure 4 The setting of the water permeable holes 332 can effectively reduce the deformation amount when the position of the test piece 2 in water changes, and further ensure the integrity of the test piece 2.

[0052] This embodiment also discloses an oil fume extractor, which includes an impeller and a sound-absorbing cotton that can reduce the rotation noise of the impeller. The water absorption rate performance of the sound-absorbing cotton is tested by using the water absorption rate testing device as described in the above Embodiment 1 and Embodiment 2. The sound-absorbing cotton detected by using the above water absorption rate testing device can obtain more accurate performance detection results, thereby improving the performance of the whole machine product, optimizing the noise reduction of the equipment, and bringing a better use experience to users.

[0053] The water absorption test device of this embodiment uses a weight block 4 to balance the buoyancy of the bracket 3 and the test piece 2 in the water. The weight block 4 is not directly placed in the test water 5, which can prevent contamination of the test water 5; and a groove 331 structure of appropriate size is provided on the bracket 3 to fix the test piece 2, thereby reducing the deformation of the test piece 2, and can ensure the integrity of the test piece 2 as much as possible, ensuring the accuracy and reliability of the test structure.

[0054] In the specification and claims of the present invention, directional terms such as "front," "back," "up," "down," "left," "right," "side," "top," and "bottom" are used to describe various exemplary structural parts and components of the present invention. However, these terms are used herein for convenience of description only and are based on the exemplary orientations shown in the accompanying drawings. Since the embodiments disclosed in the present invention can be arranged in different orientations, these directional terms are intended for illustrative purposes only and should not be construed as limiting. For example, "up" and "down" are not necessarily limited to directions opposite to or consistent with the direction of gravity.

Claims

1. A device for testing the water absorption of sound-absorbing cotton, characterized in that: The test device includes a test container (1) for containing test water (5); a test piece (2) immersed in the test water (5) of the test container (1); a bracket (3) for connecting the test piece (2) and maintaining the positioning of the test piece (2) in the test water (5); a heavy weight (4) pressed on the top of the test container (1) so that the test piece (2) can always be immersed in the test water (5).

2. The water absorption test device for sound-absorbing cotton according to claim 1, characterized in that: The bracket (3) is an integral part, and the bracket (3) includes a top cover (31), a pressure rod (32) and a bottom cover (33). Among them, the top cover (31) is arranged above the opening end of the test container (1), and the heavy weight (4) is pressed on the top cover (31); the pressure rod (32) connects the top cover (31) and the bottom cover (33); a groove (331) that matches the size of the test piece (2) and is used to accommodate the test piece (2) is provided on the bottom cover (33).

3. The water absorption test device for sound-absorbing cotton according to claim 2, characterized in that: At least one water permeable hole (332) is provided on the bottom surface of the groove (331) of the bottom cover (33) that contacts the test piece (2).

4. The water absorption test device for sound-absorbing cotton according to claim 3, characterized in that: The test piece (2) is square. Correspondingly, the groove (331) is square, and four water permeable holes (332) distributed in a "field" shape are provided on the bottom surface of the groove (331).

5. The water absorption test device for sound-absorbing cotton according to claim 1, characterized in that: The bracket (3) is a telescopic bracket (3), and the bracket (3) includes a telescopic member (34), a pressure rod (32) and a bottom cover (33). The telescopic member (34) includes a connecting part and a free part. Among them, a top cover (31) is further provided on the top of the test container (1), and a shaft hole (311) for the telescopic member (34) to extend out is provided on the top cover (31). The connecting part of the telescopic member (34) is slidably connected to the pressure rod (32), and the free part of the telescopic member (34) is arranged in the shaft hole (311) so as to be movable up and down.

6. The water absorption test device for sound-absorbing cotton according to claim 5, characterized in that: The bracket (3) is a cylinder, the cylinder body of the cylinder is the pressure rod (32), and the piston rod of the cylinder is the telescopic member (34).

7. The water absorption test device for sound-absorbing cotton according to claim 5, characterized in that: The telescopic member (34) includes a telescopic rod (340) and a hinge frame. The hinge frame includes a first hinge rod (341), a second hinge rod (342), a third hinge rod (343) and a fourth hinge rod (344) arranged in a quadrilateral shape. Among them, one end of the first hinge rod (341) is hinged to the pressure rod (32), the other end of the first hinge rod (341) is hinged to one end of the second hinge rod (342), the other end of the second hinge rod (342) is hinged to the bottom of the top cover (31), one end of the third hinge rod (343) is hinged to the bottom of the top cover (31), the other end of the third hinge rod (343) is hinged to one end of the fourth hinge rod (344), and the other end of the fourth hinge rod (344) is hinged to the top rod; and one end of the telescopic rod (340) is slidably connected to the pressure rod (32), and the other end of the telescopic rod (340) is threadedly connected to the shaft hole (311).

8. The water absorption test device for sound-absorbing cotton according to claim 7, characterized in that: A first connecting piece (321) is provided at the top of the pressure bar (32), and a second connecting piece (312) is provided at the bottom of the top cover (31); one end of the first hinge rod (341) and the other end of the fourth hinge rod (344) are respectively hinged to the first connecting piece (321); the other end of the second hinge rod (342) and one end of the third hinge rod (343) are respectively hinged to the second connecting piece (312).

9. The water absorption test device for sound-absorbing cotton according to claim 8, characterized in that: There are two first connecting pieces (321) which are arranged in parallel and spaced apart from each other. One end of the first hinge rod (341) and the other end of the fourth hinge rod (344) are respectively inserted into a groove (331) formed by the two first connecting pieces (321). Hinge connections are respectively achieved between one end of the first hinge rod (341) and the two first connecting pieces (321), and between the other end of the fourth hinge rod (344) and the two first connecting pieces (321) through a fixing member.

10. The water absorption test device for sound-absorbing cotton according to claim 8, characterized in that: There are two second connecting pieces (312) which are arranged in a straight line and spaced apart from each other. The other end of the second hinge rod (342) and one of the second connecting pieces (312) are hinged through a fixing member, and one end of the third hinge rod (343) and the other second connecting piece (312) are hinged through a fixing member.

11. The water absorption test device for sound-absorbing cotton according to claim 5, characterized in that: At least one water permeable hole (332) is formed on the bottom surface of the groove (331) of the bottom cover (33) which contacts the test piece (2).

12. The water absorption test device for sound-absorbing cotton according to claim 11, characterized in that: The test piece (2) is square. Correspondingly, the groove (331) is square, and four water permeable holes (332) distributed in a "field" shape are formed on the bottom surface of the groove (331).

13. The water absorption test device of sound-absorbing cotton according to claim 5, characterized in that: The heavy weight block (4) is pressed on the top cover (31), and a through hole (41) for the telescopic member (34) to extend out is formed in the heavy weight block (4).

14. A range hood comprising an impeller and sound-absorbing cotton capable of reducing the rotation noise of the impeller, characterized in that: The sound-absorbing cotton is tested for its water absorption performance by using the water absorption test device as described in any one of claims 1 to 13.

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