Negative pressure weighing cover structure with low-noise operation

Abstract

The utility model relates to a low-noise operation negative pressure weighing cover structure, which comprises a first box body and a fan, the weighing cover structure further comprises a second box body, the second box body is arranged at the top end of the outer side of the first box body, the fan is arranged in the second box body, the second box body is connected with the first box body through a support, and the fan is arranged in the second box body. A damping piece is arranged at the joint of the bracket and the second box body; the weighing cover structure further comprises a first air pipe and a second air pipe, and the first air pipe and the second air pipe are connected to the first box body and the second box body respectively. According to the negative pressure weighing cover, on the basis of a traditional negative pressure weighing cover, the draught fan and the draught fan box are installed on the top of equipment, the structure of a room is fully utilized, and noise is reduced; and meanwhile, by researching vibration, adding a damping piece, reducing resonance amplitude and reducing noise, under the condition that a sound insulation device is not used, the harm of noise to workers and the pollution to the environment are reduced, and the production efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of air purification and laboratory equipment, in particular to a negative pressure weighing cover structure with low noise operation. Background Art

[0002] As a special equipment for sampling, weighing, analysis and other processes, negative pressure weighing hood is widely used in medicine, food, chemical industry and other industries. Its working principle is that under the pressure provided by the centrifugal fan, the equipment adopts the form of vertical unidirectional airflow, and the return air is pre-filtered to remove the large dust particles in the airflow. The pre-treated air is then filtered for the second time and exhausted to the external environment through the weighing hood, so that the work area and the external environment form a relative negative pressure, which can control the weighing dust in the work area from spreading outside the work area. It is a purification equipment that controls dust flying and can protect the external environment and operators.

[0003] However, negative pressure weighing hoods currently generally use a built-in fan design. Since a high wind speed needs to be maintained to ensure working conditions, the fan is usually larger and uses a 380V high voltage power supply. Although this design meets the work requirements, the noise problem it brings cannot be ignored. In actual operation, when the number of fans is increased to improve work efficiency, the noise level in the work area often exceeds 90dB(A), or even reaches more than 100dB(A), posing a serious threat to the hearing of operators. Utility Model Content

[0004] In view of the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide a negative pressure weighing hood structure with low noise operation to solve one or more problems in the prior art.

[0005] To achieve the above purpose, the technical solution of the utility model is as follows:

[0006] A negative pressure weighing hood structure with low noise operation includes a first box body and a fan. The weighing hood structure also includes a second box body, the second box body is arranged at the top end of the outer side of the first box body, the fan is arranged in the second box body, the second box body is connected to the first box body through a bracket, and a shock absorber is arranged at the junction of the bracket and the second box body; the weighing hood structure also includes a first air duct and a second air duct, the first air duct and the second air duct are respectively connected to the first box body and the second box body.

[0007] Furthermore, a first channel and a second channel are provided in the first box body, the first channel and the second channel are provided in abutment with each other, the first air duct is connected to the first channel, and the second air duct is connected to the second channel.

[0008] Furthermore, the weighing cover structure also includes a first filter assembly, the first filter assembly includes a first filter and a second filter, the first filter is connected to the second filter and both are arranged in the first channel.

[0009] Furthermore, the weighing cover structure also includes a second filter component, which is arranged in the second channel. The second filter component includes a third filter and a flow equalizing membrane. The flow equalizing membrane is matched with the third filter, and one end of the flow equalizing membrane is arranged close to the ground.

[0010] Furthermore, the weighing cover structure also includes an exhaust hole plate, which is arranged on the surface of the first box body and connected to the second channel.

[0011] Furthermore, the weighing hood structure also includes a return air orifice plate, which is arranged on the surface of the first box body and connected to the first filter assembly.

[0012] Furthermore, the weighing cover structure also includes a guide plate, which is arranged in the second channel and connected to the second air duct.

[0013] Compared with the prior art, the beneficial technical effects of the utility model are as follows:

[0014] The utility model of negative pressure weighing cover is based on the traditional negative pressure weighing cover. The fan and the fan box are installed on the top of the equipment and the structure of the room is fully utilized to reduce noise. At the same time, through the study of vibration, rubber gaskets are added to reduce the resonance amplitude and reduce noise generation. Without using a sound insulation device, while meeting the existing negative pressure weighing function, the noise in the working area is greatly reduced, the harm of noise to the staff and the pollution to the environment are reduced, and the production efficiency is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A schematic diagram of the internal structure of a first box body and a second box body of a negative pressure weighing cover structure with low noise operation according to an embodiment of the utility model is shown.

[0016] Figure 2 A schematic diagram of the main structure of a negative pressure weighing hood structure with low noise operation according to an embodiment of the utility model is shown.

[0017] Figure 3 A schematic diagram of the large-scale structure of a negative pressure weighing hood structure with low noise operation at position A of an embodiment of the utility model is shown.

[0018] Figure 4 A schematic diagram of the top view of the first box body of a negative pressure weighing cover structure with low noise operation is shown in an embodiment of the utility model.

[0019] Markings in the accompanying drawings: 1. first box; 101. first channel; 102. second channel; 2. second box; 3. fan; 4. bracket; 5. shock absorber; 6. first air duct; 7. second air duct; 8. first filter assembly; 801. first filter; 802. second filter; 9. second filter assembly; 901. third filter; 902. flow equalizing membrane; 10. switch; 11. exhaust orifice plate; 12. return air orifice plate; 13. guide plate; 14. sensor; 15. first differential pressure gauge; 16. second differential pressure gauge; 17. socket. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solution and advantages of the utility model clearer, the following is a further detailed description of a low-noise negative pressure weighing hood structure proposed by the utility model in combination with the accompanying drawings and specific embodiments. According to the following description, the advantages and features of the utility model will be clearer. It should be noted that the accompanying drawings adopt a very simplified form and all use non-precise proportions. The terms "center", "lateral", "length", "width", "height", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "side" and the like indicate the orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings, rather than indicating or implying that the low-noise negative pressure weighing hood structure or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the utility model, but only to facilitate and clearly assist in explaining the purpose of the implementation method of the utility model. In order to make the purpose, features and advantages of the utility model more obvious and easy to understand, please refer to the accompanying drawings.

[0021] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings in this specification are only used to match the contents disclosed in the specification so that people familiar with this technology can understand and read them. They are not used to limit the conditions for the implementation of the utility model, so they have no substantive technical significance. Any modification of the structure, change in the proportion relationship or adjustment of the size should still fall within the scope of the technical content disclosed by the utility model without affecting the effects and purposes that can be achieved by the utility model.

[0022] The specific structure of a negative pressure weighing hood structure with low noise operation is described below:

[0023] by Figure 2 The front end of the negative pressure weighing hood structure is shown for illustration.

[0024] See also Figures 1 to 4The negative pressure weighing hood structure for noise reduction operation of this embodiment includes a first box body 1, a second box body 2 and a fan 3. The second box body 2 is arranged at the top of the outer side of the first box body 1, and can be matched with the ceiling in the room and installed above the mezzanine. This design is different from the structure of the traditional negative pressure weighing hood, which installs the fan 3 in the first box body 1, and moves the noise source from the front of the working area to the mezzanine, so as to keep the working area away from the noise source as much as possible. Secondly, the sound insulation function of the room wall can be fully utilized to increase the sound insulation effect of the negative pressure weighing hood structure. In addition, the fan 3 is moved from the inside of the first box body 1 to the top for installation, which saves volume. Compared with the traditional weighing hood, it is half the size and can be installed in a room with a narrower surface, which improves applicability.

[0025] Furthermore, the fan 3 is arranged in the second box body 2, the second box body 2 is connected to the first box body 1 through a bracket 4, and a shock absorber 5 is arranged at the junction of the bracket 4 and the second box body 2. Preferably, in this embodiment, the shock absorber 5 adopts a compression type rubber vibration isolator, which can effectively increase the damping when the fan 3 is working and reduce the vibration amplitude generated by the operation of the fan 3.

[0026] Furthermore, a first channel 101 and a second channel 102 are provided in the first housing 1 . Preferably, in the present embodiment, two first channels 101 and one second channel 102 are provided, and the two first channels 101 are adjacently provided and are respectively provided in contact with the second channel 102 .

[0027] Furthermore, the weighing hood structure also includes a first air duct 6 and a second air duct 7, one end of the first air duct 6 and the second air duct 7 are respectively connected to the second box 2, the other end of the first air duct 6 is connected to the first channel 101, and the other end of the second air duct 7 is connected to the second channel 102.

[0028] Furthermore, the weighing cover structure also includes a first filter component 8, which includes a first filter 801 and a second filter 802. Preferably, in this embodiment, the first filter 801 is a primary filter, the second filter 802 is a high-efficiency filter, the first filter 801 is connected to the second filter 802 and both are arranged in the first channel 101, and one end of the first filter 801 is arranged against the surface of the first channel 101.

[0029] Furthermore, the weighing hood structure also includes a second filter component 9, which includes a third filter 901 and a flow equalizing membrane 902. Preferably, in this embodiment, the third filter 901 is an air supply high-efficiency filter, and the flow equalizing membrane 902 is cooperated with the third filter 901, and the flow equalizing membrane 902 is arranged below the third filter 901.

[0030] Further, the second filter assembly 9 is disposed in the second channel 102, and the weighing cover structure further comprises an exhaust orifice plate 11, which is detachably disposed on the front end surface of the first box body 1 and connected to the second channel 102. The weighing cover structure further comprises a return air orifice plate 12, which is disposed on the front end surface of the first box body 1 and connected to the first filter 801 in the first filter assembly 8.

[0031] Furthermore, the weighing cover structure also includes a guide plate 13 , and the guide plate 13 is disposed in the second channel 102 and connected to the second air duct 7 .

[0032] Furthermore, a sensor 14, a first differential pressure gauge 15, a second differential pressure gauge 16, a socket 17 and a switch 10 are also provided at the front end of the first box body 1 on the surface of the first channel 101. Preferably, in this embodiment, the sensor 14 is a wind speed sensor for sensing the wind speed in the first channel 101. The first differential pressure gauge 15 and the second differential pressure gauge 16 are respectively a medium-efficiency differential pressure gauge and an air supply high-efficiency differential pressure gauge, which are convenient for detecting whether the filter is damaged or blocked during daily use. The socket 17 is used for powering on, and the switch 10 is a lighting switch for lighting control of the negative pressure weighing hood structure.

[0033] The specific working process of a negative pressure weighing cover structure with low noise operation described in the embodiment of the utility model is described as follows:

[0034] Please continue reading Figure 1 When the fan 3 is in operation, the wind passes through the second air duct 7 from the fan 3, passes through the guide plate 13 to reach the second channel 102, and then passes through the third filter 901 and the flow equalizing membrane 902 in turn for equalizing and exhausting. The return air passes through the return air orifice plate 12 and then passes through the first filter 801 and the second filter 802 in turn for filtration, and is sent from the first channel 101 to the first air duct 6, and then reaches the fan 3, thus self-circulating. During operation, after part of the wind in the second channel 102 passes through the guide plate 13, 10-15% of the wind is discharged from the exhaust orifice plate 11, and the remaining wind continues to be discharged through the third filter 901 and the flow equalizing membrane 902, so that negative pressure is formed inside the negative pressure weighing hood structure, so the wind outside the negative pressure weighing hood structure flows in from the return air orifice plate 12 for replenishing air.

[0035] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0036] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A negative pressure weighing hood structure with low noise operation, comprising a first box body and a fan, characterized in that: The weighing cover structure also includes a second box body, which is arranged at the top end of the outer side of the first box body, and the fan is arranged in the second box body. The second box body is connected to the first box body through a bracket, and a shock absorber is arranged at the junction of the bracket and the second box body; the weighing cover structure also includes a first air duct and a second air duct, and the first air duct and the second air duct are respectively connected to the first box body and the second box body.

2. A low-noise negative pressure weighing cover structure as claimed in claim 1, characterized in that: A first channel and a second channel are disposed in the first box body, the first channel and the second channel are disposed in contact with each other, the first air duct is connected to the first channel, and the second air duct is connected to the second channel.

3. A negative pressure weighing cover structure with low noise operation as claimed in claim 2, characterized in that: The weighing cover structure further includes a first filter assembly, the first filter assembly includes a first filter and a second filter, the first filter is connected to the second filter and both are arranged in the first channel.

4. A negative pressure weighing cover structure with low noise operation as claimed in claim 3, characterized in that: The weighing cover structure also includes a second filter component, which is arranged in the second channel. The second filter component includes a third filter and a flow equalizing membrane. The flow equalizing membrane is matched with the third filter, and one end of the flow equalizing membrane is arranged close to the ground.

5. A negative pressure weighing cover structure with low noise operation as claimed in claim 4, characterized in that: The weighing cover structure also includes an exhaust hole plate, which is arranged on the surface of the first box body and connected to the second channel.

6. A negative pressure weighing cover structure with low noise operation as claimed in claim 5, characterized in that: The weighing cover structure also includes a return air hole plate, which is arranged on the surface of the first box body and connected to the first filter assembly.

7. A negative pressure weighing cover structure with low noise operation as claimed in claim 6, characterized in that: The weighing cover structure also includes a guide plate, which is arranged in the second channel and connected to the second air duct.

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