Negative pressure weighing chamber with stable internal negative pressure
By designing a multi-stage filter structure and air inlet gap in the negative pressure weighing chamber, the problem of unstable ventilation quality in the negative pressure weighing chamber and easy blockage of the filter structure is solved, and the negative pressure and ventilation stability of the weighing chamber is achieved, avoiding external pollution and blockage of the filter structure.
Patent Information
- Application Number
- CN202421315354.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-11
- Publication Date
- 2025-03-14
- Estimated Expiration
- 2034-06-11
AI Technical Summary
The air inlet and outlet structure and filter structure design of common negative pressure weighing chambers are difficult to ensure stable ventilation quality, and the filter structure is easily blocked, resulting in unstable negative pressure inside the weighing chamber and cross-contamination with the external environment.
A negative pressure weighing chamber with stable internal negative pressure is designed. By setting an inlet and partition on the main body of the weighing chamber into a negative pressure chamber and a return air chamber, and installing a soft curtain at the inlet to leave an air inlet gap, a multi-stage filter structure is set up, including primary and medium-effect filters. The filter structure adopts a step-shaped mounting frame and return air dispersion plate to ensure the speed up of the air flow and ventilation quality.
The stable ventilation and negative pressure in the negative pressure weighing room are achieved, which avoids the pollution of symmetrical substances in the outside air, ensures the cleanliness and ventilation efficiency of the filter structure, and avoids the problems of blockage of the filter structure and instability of the negative pressure.
Smart Images
Figure CN222605796U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of weighing chambers, in particular to a negative pressure weighing chamber with stable internal negative pressure. Background Art
[0002] Weighing rooms are generally used for weighing operations such as solid mass and liquid volume weighing. In order to avoid the pollution of volatile substances to the external environment, weighing rooms are mostly designed with negative pressure. The air inlet and outlet structure of common negative pressure weighing rooms and the filter structure design therein are difficult to ensure stable ventilation quality. The filter structure is easy to clog, making the negative pressure inside the weighing room unstable, resulting in the problem of cross contamination between the weighing room and the external environment when the weighing room is used for weighing. Utility Model Content
[0003] The purpose of the utility model is to provide a negative pressure weighing chamber with stable internal negative pressure in order to solve the problem that the air inlet and outlet structure of a common negative pressure weighing chamber and the filter structure design therein are difficult to ensure stable ventilation quality, the filter structure is easily clogged, and the negative pressure inside the weighing chamber is unstable, resulting in cross-contamination with the external environment when the weighing chamber is used for weighing.
[0004] In order to achieve the above purpose, the utility model adopts the following technical solution: a negative pressure weighing chamber with stable internal negative pressure, comprising:
[0005] The weighing chamber body is provided with an inlet, and the inner cavity is divided into a negative pressure cavity and a return air cavity by a partition, and a second exhaust mesh port is provided on the weighing chamber body;
[0006] A soft curtain is mounted at the inlet through a mounting structure, and an air inlet gap is left between the bottom of the soft curtain and the bottom surface of the inlet;
[0007] A filtering structure is arranged on the partition, and the filtering structure is provided with a stepped mounting frame extending toward the return air cavity. The filtering structure includes a primary filter and a medium filter arranged in the stepped mounting frame from the negative pressure cavity toward the return air cavity, and return air diffusers are arranged at the connection between each layer in the stepped mounting frame.
[0008] As a further description of the above technical solution:
[0009] The mounting structure comprises an arc-shaped connecting piece, and the ends of the arc-shaped connecting piece are respectively connected to the weighing room body and the top of the soft curtain through fasteners.
[0010] As a further description of the above technical solution:
[0011] A sealing cover is arranged outside the arc-shaped connecting piece, and the sealing cover is assembled on the weighing chamber body.
[0012] As a further description of the above technical solution:
[0013] The filtering structure is located at the bottom of the partition.
[0014] As a further description of the above technical solution:
[0015] The primary filter is a plate filter, and the medium filter is a bag filter.
[0016] As a further description of the above technical solution:
[0017] A first exhaust mesh port is arranged at the connection between each box module in the weighing room body.
[0018] In summary, due to the adoption of the above technical solution, the utility model has the following advantages compared with the prior art:
[0019] Beneficial effects:
[0020] The weighing room is provided with an air inlet gap and a filter structure at the bottom, so that the bottom air volume of the negative pressure weighing room is supplemented and directly sucked into the filter structure, so as to avoid the pollution of the weighing material by the outside air and ensure stable air intake; the filter structure is designed to be continuously tightened along the airflow direction, and when the airflow velocity is damaged by the filter structure, the airflow is accelerated to ensure ventilation and negative pressure quality; the multi-stage filter structure is used to intercept dust and dirt of different particle sizes separately, and compared with the single filter design, the dust is collected more fully, and the dust is prevented from falling off, and the dust of different particle sizes is prevented from being interlocked, which leads to frequent clogging of the filter structure, obstructed ventilation, decreased stability of the negative pressure inside the weighing room, and inconvenient cleaning of the filter structure. The overall ventilation operation of the device is efficient and the internal negative pressure is stable. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.
[0022] Figure 1 It is a schematic diagram of the three-dimensional structure of a negative pressure weighing chamber with stable internal negative pressure.
[0023] Figure 2 The present invention is a schematic diagram of the cross-sectional structure of a negative pressure weighing chamber with stable internal negative pressure.
[0024] Figure 3 for Figure 2 Enlarged view of point A in the middle.
[0025] Legend:
[0026] 1. Weighing room body; 11. Inlet; 12. Soft curtain; 13. Partition; 14. Negative pressure chamber; 15. Return air chamber; 16. First exhaust mesh port; 17. Second exhaust mesh port; 2. Mounting structure; 21. Arc-shaped connecting piece; 22. Cover; 3. Filter structure; 31. Step-shaped mounting frame; 32. Primary filter; 33. Medium filter. DETAILED DESCRIPTION
[0027] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0028] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.
[0029] See also Figure 1-3 The utility model provides a technical solution: a negative pressure weighing chamber with stable internal negative pressure, comprising:
[0030] The weighing chamber body 1 is provided with an inlet 11, and the inner cavity is divided into a negative pressure cavity 14 and a return air cavity 15 by a partition 13, and a second exhaust mesh port 17 is provided on the weighing chamber body 1; a workbench and a weighing device are provided in the negative pressure cavity 14;
[0031] A soft curtain 12 is mounted at the inlet 11 through the mounting structure 2, and an air inlet gap is left between the bottom of the soft curtain 12 and the bottom surface of the inlet 11;
[0032] The filtering structure 3 is arranged on the partition 13, and the filtering structure 3 is provided with a stepped mounting frame 31 extending toward the return air cavity 15. The filtering structure 3 includes a primary filter 32 and a medium filter 33 arranged in the stepped mounting frame 31 from the negative pressure cavity 14 toward the return air cavity 15. Return air diffusers are arranged at the connection of each layer in the stepped mounting frame 31. The design of the filtering structure 3 whose structure is continuously tightened along the airflow direction can speed up the airflow when the airflow velocity is damaged due to the filtering structure, thereby ensuring the stability of the ventilation negative pressure.
[0033] The mounting structure 2 includes an arc-shaped connecting piece 21 , and ends of the arc-shaped connecting piece 21 are respectively connected to the weighing chamber body 1 and the top of the soft curtain 12 through fasteners.
[0034] A sealing cover 22 is disposed outside the arc-shaped connecting piece 21 , and the sealing cover 22 is assembled on the weighing chamber body 1 .
[0035] The filtering structure 3 is located at the bottom of the partition 13, so that the bottom air volume of the negative pressure weighing chamber is supplemented and sucked into the filtering structure 3, thereby preventing the outside air from contaminating the negative pressure cavity 14 and the weighing material.
[0036] The primary filter 32 is a plate filter, and the medium filter 33 is a bag filter. Through the multi-stage filtering structure, dust and dirt of different particle sizes can be intercepted separately. Compared with the single filter filtering design, the dust can be collected more fully, and the dust can be prevented from falling off. It can also prevent the dust of different particle sizes from being embedded, resulting in frequent clogging of the filtering structure, obstructed ventilation, reduced negative pressure stability inside the weighing chamber, and inconvenient cleaning of the filtering structure.
[0037] A first exhaust mesh port 16 is provided at the connection between each box module in the weighing chamber body 1 .
[0038] The working principle of a negative pressure weighing room with stable internal negative pressure in the present embodiment includes: a person starts a control switch so that the fan in the return air cavity 15 draws out the internal airflow of the negative pressure cavity 14, thereby forming a negative pressure inside the cavity, and outside air enters through the air inlet gap at the bottom of the soft curtain 12 for internal air supply, and the airflow enters the filter structure 3, and through its multi-stage filtration, the clean airflow is discharged from the return air cavity 15, the first exhaust mesh port 16, and the second exhaust mesh port 17 to discharge the weighing room, thereby achieving stable negative pressure in the weighing room.
[0039] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.
Claims
1. A negative pressure weighing chamber with stable internal negative pressure, characterized in that: include: The weighing chamber body is provided with an inlet, and the inner cavity is divided into a negative pressure cavity and a return air cavity by a partition, and a second exhaust mesh port is provided on the weighing chamber body; A soft curtain is mounted at the inlet through a mounting structure, and an air inlet gap is left between the bottom of the soft curtain and the bottom surface of the inlet; A filtering structure is arranged on the partition, and the filtering structure is provided with a stepped mounting frame extending toward the return air cavity. The filtering structure includes a primary filter and a medium filter arranged in the stepped mounting frame from the negative pressure cavity toward the return air cavity, and return air diffusers are arranged at the connection between each layer in the stepped mounting frame.
2. A negative pressure weighing chamber with stable internal negative pressure according to claim 1, characterized in that: The mounting structure comprises an arc-shaped connecting piece, and the ends of the arc-shaped connecting piece are respectively connected to the weighing room body and the top of the soft curtain through fasteners.
3. A negative pressure weighing chamber with stable internal negative pressure according to claim 2, characterized in that: A sealing cover is arranged outside the arc-shaped connecting piece, and the sealing cover is assembled on the weighing chamber body.
4. A negative pressure weighing chamber with stable internal negative pressure according to claim 1, characterized in that: The filtering structure is located at the bottom of the partition.
5. A negative pressure weighing chamber with stable internal negative pressure according to claim 1, characterized in that: The primary filter is a plate filter, and the medium filter is a bag filter.
6. A negative pressure weighing chamber with stable internal negative pressure according to claim 1, characterized in that: A first exhaust mesh port is arranged at the connection between each box module in the weighing room body.