Negative pressure weighing chamber convenient to adjust
By designing a shared high-efficiency filter and setting a negative pressure weighing chamber with partitions, baffles and air guides, the problems of high costs and frequent maintenance in the prior art are solved, and the cost reduction and stability of a clean environment are achieved.
Patent Information
- Application Number
- CN202421037835.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-14
- Publication Date
- 2024-12-27
- Estimated Expiration
- 2034-05-14
AI Technical Summary
The existing negative pressure weighing chamber is costly and frequently maintained, mainly because the filtering devices of the air outlet and exhaust outlet need to be replaced frequently, and the equipment design leads to noise and air pressure unstable.
Design a negative pressure weighing chamber that is easy to adjust, and a structure consisting of the rear and upper chambers is shared. The partition and baffle are arranged to reduce noise and air pressure difference, and the support is adjusted by rotating screws. For improved stability, the seat uses an air guide to guide clean air.
It reduces the use of filter devices, reduces the problem of frequent maintenance, reduces costs, reduces wind noise, and ensures the stability of a clean environment.
Smart Images
Figure CN222240325U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of air purification, in particular to a negative pressure weighing room which is easy to adjust. Background Art
[0002] The negative pressure weighing room is a local purification equipment specially used in places such as pharmaceutical manufacturing, microbiological research and scientific experiments. It provides a vertical unidirectional airflow. Part of the clean air circulates in the working area, and part is discharged to the nearby area, so that negative pressure is generated in the working area to prevent cross contamination and to ensure a high cleanliness environment in the working area.
[0003] The existing negative pressure weighing chamber generally has a filter device disposed at the lower part of the back, and an air outlet and an exhaust port disposed at the upper part.
[0004] For example, a self-cleaning negative pressure weighing chamber disclosed in Chinese patent CN219378367U uses ultrasonic waves to clean the primary filter screen to improve the filtering efficiency of the primary filter screen.
[0005] A negative pressure weighing chamber is disclosed in Chinese patent CN219675268U. The negative pressure weighing chamber is provided with a lower uniform filter and an upper uniform filter. The lower uniform filter and the upper uniform filter facilitate uniformly dispersed gas filtering, so that the filtering is not concentrated in a certain place, which effectively improves the overall service life and is more efficient during uniform filtration.
[0006] However, the above-mentioned existing negative pressure weighing chambers, while solving the problem, have the following defects:
[0007] 1. Filter devices are installed at the bottom of the back of the negative pressure weighing chamber, as well as at the air outlet and exhaust outlet on the top. Therefore, one device needs to use three filter devices, which is costly.
[0008] 2. The filtering devices at the air outlet and exhaust outlet above the negative pressure weighing room usually use high-efficiency filters, but the ratio of air outlet volume to exhaust volume is not equal. The air outlet volume must be greater than the exhaust volume. Therefore, the air volume that needs to be filtered at the air outlet and exhaust outlet is not equal. Therefore, the high-efficiency filters at the air outlet and exhaust outlet will require different replacement cycles due to the different air outlet volumes. As a result, after one of the high-efficiency filters is replaced later, the other high-efficiency filter will need to be replaced soon after, which leads to more frequent maintenance problems. Utility Model Content
[0009] The purpose of the utility model is to solve at least one of the technical defects described in the background technology.
[0010] To this end, one purpose of the utility model is to provide a negative pressure weighing chamber that is easy to adjust, aiming to solve the problems of high cost and frequent maintenance of negative pressure weighing chambers in the prior art.
[0011] In order to achieve the above-mentioned purpose, an embodiment of the utility model on one hand provides a negative pressure weighing chamber that is easy to adjust, including a negative pressure chamber body composed of a rear cavity and an upper cavity, the upper cavity is fixedly connected to the top of the rear cavity, and is internally connected, characterized in that a first filter cavity is fixedly connected to the bottom of the front side of the inner wall of the rear cavity, a primary filter is fixedly installed inside the first filter cavity, a centrifugal fan is fixedly installed on the inner wall of the rear cavity, a second filter cavity is fixedly connected to the upper part of the front side of the inner wall of the rear cavity, an air inlet is provided at the bottom of the second filter cavity, a high-efficiency filter is fixedly installed inside the second filter cavity, the air outlet of the centrifugal fan faces the air inlet, a first exhaust hole is provided at the bottom of the upper cavity, and a second exhaust hole is provided on the front side of the upper cavity.
[0012] Preferably, any of the above schemes has a partition fixedly connected to the inner wall of the rear cavity, a hole groove is provided on the top of the partition, and the air outlet of the centrifugal fan is connected to the hole groove, so as to avoid the problem of noise amplification caused by the air blown out by the centrifugal fan flowing back and forth between the high-efficiency filter and the primary-efficiency filter.
[0013] Preferably, any of the above schemes is that a baffle is fixedly connected to the top of the front side of the inner wall of the upper cavity, and there is a gap between the bottom of the baffle and the bottom of the inner wall of the upper cavity, so as to prevent excessive discharge of purified air, resulting in too low air pressure inside the negative pressure chamber and the problem of too much outdoor air being pressed in.
[0014] Preferably, any of the above schemes is that an air guide cover is fixedly connected to the front side of the upper cavity to blow the exhausted purified air toward the inlet at the front part of the negative pressure chamber body, thereby making the air entering the negative pressure chamber body cleaner.
[0015] Preferably, any of the above schemes is that positioning cylinders are fixedly connected at the four corners of the outer wall of the negative pressure chamber body, the internal thread of the positioning cylinder is connected to a screw, and the bottom end of the screw is fixedly connected to a support, which is convenient for adjusting the four supporting legs, so that the negative pressure chamber body stands more stably.
[0016] Compared with the prior art, the advantages and beneficial effects of the utility model are:
[0017] 1. The air passing through the first exhaust hole and the second exhaust hole uses a common high-efficiency filter, thereby reducing the use of filtering devices and achieving the purpose of reducing costs.
[0018] 2. Regardless of the exhaust volume, you only need to regularly maintain and replace this one high-efficiency filter, which solves the problem of frequent maintenance.
[0019] 3. By rotating the screw, the height of the support can be adjusted so that all the supports can touch the ground, thereby achieving the purpose of facilitating the adjustment of the stability of the negative pressure chamber body.
[0020] 4. By setting up a partition, a high-pressure area is formed between the high-efficiency filter and the partition, which can pressurize the air to quickly pass through the high-efficiency filter. Due to the high air pressure, the air entering the top of the partition is difficult to spread around and collide with the air in the high-pressure area, thereby reducing wind noise to a certain extent.
[0021] 5. By setting the baffle, the exhausted air can be reduced to a certain extent, so that the pressure difference between the negative pressure chamber and the outside world is smaller, thus preventing a large amount of unclean air from entering the negative pressure chamber.
[0022] 6. By setting up the air guide cover, the air guide cover guides the clean air discharged through the second exhaust hole to the front side of the curtain. Even if the external air enters the negative pressure chamber through the curtain, it is relatively clean, which can ensure the cleanliness of the negative pressure chamber.
[0023] Additional aspects and advantages of the present invention will be given in part in the following description and in part will become apparent from the following description or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS
[0024] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:
[0025] Figure 1 It is a structural schematic diagram according to the utility model.
[0026] Figure 2 It is a schematic cross-sectional structure diagram according to the utility model.
[0027] Figure 3 It is a schematic cross-sectional structure diagram of the negative pressure chamber body according to the utility model.
[0028] Figure 4 It is a schematic diagram of the structure of the first positioning plate and the second positioning plate according to the utility model.
[0029] Wherein: 1. negative pressure chamber body, 11. rear cavity, 111. first filter cavity, 112. centrifugal fan, 113. partition, 114. hole groove, 115. second filter cavity, 116. air inlet, 12. upper cavity, 121. first exhaust hole, 122. second exhaust hole, 123. baffle, 124. air guide cover, 2. primary filter, 21. first positioning plate, 22. first fixing block, 3. high efficiency filter, 31. second positioning plate, 32. second fixing block, 4. curtain, 5. positioning cylinder, 51. screw, 52. support. DETAILED DESCRIPTION
[0030] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.
[0031] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0032] The utility model provides a negative pressure weighing chamber which is easy to adjust.
[0033] Embodiment 1:
[0034] like Figure 1-3As shown, it includes a negative pressure chamber body 1 composed of a rear cavity 11 and an upper cavity 12, the upper cavity 12 is fixedly connected to the top of the rear cavity 11 and is internally connected, wall panels are fixed on both sides of the rear cavity 11 and the upper cavity 12, and bottom plates are fixed on the wall panels on both sides and the bottom of the rear cavity 1, thereby forming a negative pressure chamber body 1 with a front opening, characterized in that a first filter cavity 111 is fixedly connected to the bottom of the front side of the inner wall of the rear cavity 11, a primary filter 2 is fixedly installed inside the first filter cavity 111, a plurality of through holes are opened on the back side of the first filter cavity 111 for ventilation, a centrifugal fan 112 is fixedly installed on the inner wall of the rear cavity 11, a second filter cavity 115 is fixedly connected to the upper part of the front side of the inner wall of the rear cavity 11, a plurality of through holes are opened on the top of the second filter cavity 115 for gas discharge, an air inlet hole 116 is opened at the bottom of the second filter cavity 115, and an air inlet hole 116 is fixedly installed inside the second filter cavity 115. A high-efficiency filter 3 is installed, and the air outlet of the centrifugal fan 112 faces the air inlet 116. The centrifugal fan 112 is started, and the centrifugal fan 112 blows the air in the rear cavity 11 upward, so that the air in the rear cavity 11 passes through the high-efficiency filter 3 and then enters the upper cavity 12. Since part of the air in the rear cavity 11 enters the upper cavity 12, the air pressure in the rear cavity 11 is reduced, so the air in the negative pressure chamber body 1 will pass through the primary filter 2 and enter the rear cavity 11. A first exhaust hole 121 is provided at the bottom of the upper cavity 12, and a second exhaust hole 122 is provided on the front side of the upper cavity 12. The number of the first exhaust holes 121 is greater than the number of the second exhaust holes 122, so that most of the air in the upper cavity 12 enters the negative pressure chamber body 1 through the first exhaust hole 121, and a small amount of air is discharged to the outside of the negative pressure chamber body 1 through the second exhaust hole 122, thereby forming a negative pressure state in the negative pressure chamber body 1.
[0035] Specifically, Figure 2-4 As shown, two mounting openings are provided on the front side of the rear cavity 11, and the two mounting openings are respectively connected to the first filter cavity 111 and the second filter cavity 115. The primary filter 2 and the high-efficiency filter 3 can be respectively inserted into the first filter cavity 111 and the second filter cavity 115 through the two mounting openings, and a first positioning plate 21 is fixedly installed in the mounting opening connected to the first filter cavity 111, and a plurality of through holes are provided on the first positioning plate 21, so that the air in the negative pressure chamber body 1 can penetrate the first positioning plate 21, and a second positioning plate 31 is fixedly installed in the mounting opening connected to the second filter cavity 115. The first positioning plate 21 and the second positioning plate 31 respectively position the primary filter 2 and the high-efficiency filter 3, so that the primary filter 2 and the high-efficiency filter 3 can be fixed.
[0036] Specifically, Figure 4As shown, the first positioning plate 21 is fixedly connected to the first fixing block 22 on the upper and lower sides, and the second positioning plate 31 is fixedly connected to the second fixing block 32 on the upper and lower sides. Holes are respectively provided on the first fixing block 22 and the second fixing block 32. Bolts can be used to penetrate the holes on the first fixing block 22 or the second fixing block 32 and threadedly connected to the threaded holes on the outer wall of the rear cavity 11, thereby achieving the purpose of fixing the first positioning plate 21 and the second positioning plate 31.
[0037] Specifically, Figure 1 As shown, a barrier curtain 4 is fixedly connected to the bottom of the front side of the upper cavity 12, and the barrier curtain 4 blocks the inlet at the front of the negative pressure chamber body 1, thereby reducing the circulation of air inside and outside the negative pressure chamber body 1.
[0038] Since the ground is usually not very level, if the negative pressure chamber body 1 is placed directly on the ground, the bottom plate may not be in sufficient contact with the bottom surface, resulting in shaking. Figure 1 As shown, specifically, the four corners of the outer wall of the negative pressure chamber body 1 are fixedly connected with a positioning cylinder 5, the internal thread of the positioning cylinder 5 is connected with a screw rod 51, and the bottom end of the screw rod 51 is fixedly connected with a support 52. By rotating the screw rod 51, the height of the support 52 can be adjusted, so that all the supports 52 can touch the ground, thereby achieving the purpose of facilitating the adjustment of the stability of the negative pressure chamber body 1.
[0039] Embodiment 2:
[0040] like Figure 2-3 As shown, after the air blown upward by the centrifugal fan 112 hits the high-efficiency filter 3, part of the air will directly penetrate the high-efficiency filter 3 and be filtered, and the other part will diffuse to the surroundings, and then spread downward along the inner wall of the rear cavity 11, and collide with the air that has just passed through the primary filter 2 below and entered the rear cavity 11, thereby generating a large wind noise. Therefore, on the basis of Example 1, a partition 113 is fixedly connected to the inner wall of the rear cavity 11, and a hole groove 114 is opened on the top of the partition 113. The air outlet of the centrifugal fan 112 is connected to the hole groove 114, and the centrifugal fan 112 continuously transports air between the partition 113 and the high-efficiency filter 3. Since the air cannot spread downward, a high-pressure area is formed between the high-efficiency filter 3 and the partition 113, which can pressurize the air to quickly pass through the high-efficiency filter 3. Moreover, due to the high air pressure, the air that has just passed through the centrifugal fan 112 and entered the top of the partition 113 will be squeezed, making it difficult to spread around and collide with the air in the high-pressure area, thereby reducing the wind noise to a certain extent.
[0041] Embodiment three:
[0042] like Figure 2-3As shown, the purified clean air passes through the connection between the rear cavity 11 and the upper cavity 12 and then turns and flows directly toward the second exhaust hole 122, so that the air pressure inside the upper cavity 12 near the second exhaust hole 122 is slightly higher, so that more air will be discharged to the outside through the second exhaust hole 122. Therefore, the air pressure inside the negative pressure chamber body 1 is much different from the outdoor air pressure, so that more unclean air will be pressed into the negative pressure chamber body 1 through the curtain 4. Therefore, on the basis of the first or second embodiment, a curtain is fixedly connected to the top of the front side of the inner wall of the upper cavity 12 Plate 123, there is a gap between the bottom of the baffle 123 and the bottom of the inner wall of the upper cavity 12, when the purified clean air flows in the direction of the second exhaust hole 122, it is blocked by the baffle 123 and then turns again, thereby downward through the first exhaust hole 121 into the negative pressure chamber body 1, a small amount of clean air passes through the gap below the baffle 123, and then is discharged from the second exhaust hole 122, thereby reducing the discharged air to a certain extent, making the pressure difference between the negative pressure chamber body 1 and the outside smaller, and avoiding a large amount of unclean air from entering the negative pressure chamber body 1.
[0043] Embodiment 4:
[0044] like Figure 1-3 As shown, on the basis of Example 1 or Example 2 or Example 3, an air guide hood 124 is fixedly connected to the front side of the upper cavity 12, and the air guide hood 124 guides the clean air discharged through the second exhaust hole 122 to the front side of the curtain 4. Therefore, the air outside the front side of the negative pressure chamber body 1 is relatively clean, so even if the external air enters the negative pressure chamber body 1 through the curtain 4, it is still relatively clean, which can ensure the cleanliness of the negative pressure chamber body 1.
[0045] The working principle of the utility model is as follows: when in use, the curtain 4 is pulled tightly to block the front side of the negative pressure chamber body 1, and then the centrifugal fan 112 is started. The air in the negative pressure chamber body 1 is filtered by the primary filter 2 and enters the rear cavity 11, and is transmitted upward by the centrifugal fan 112, and then enters the upper cavity 12 after being filtered by the high-efficiency filter 2. Most of the purified air enters the negative pressure chamber body 1 through the first exhaust hole 121, thereby achieving the purpose of purifying the air in the negative pressure chamber body 1, and a small part of the purified air is discharged through the second exhaust hole 122, thereby reducing the air in the negative pressure chamber body 1, reducing the air pressure, and making the negative pressure chamber body 1 a negative pressure state.
[0046] Compared with the prior art, the present invention has the following beneficial effects:
[0047] 1. By arranging the high-efficiency filter 3 above the centrifugal fan 112 and in the rear cavity 11, there is no need to arrange the high-efficiency filter 3 in the upper cavity 12. The air passing through the first exhaust hole 121 and the second exhaust hole 122 share a high-efficiency filter 3, thereby reducing the use of filtering devices and achieving the purpose of reducing costs.
[0048] 2. Since the air discharged to the outside and the air entering the negative pressure chamber body 1 share a high efficiency filter 3, no matter how much the exhaust air volume is, it is only necessary to regularly maintain and replace this high efficiency filter 3, thus solving the problem of frequent maintenance.
[0049] 3. Since the ground cannot be completely flat, the bottom of the negative pressure chamber body 1 cannot fully contact the ground, so it is easy to shake. By rotating the screw 51, the height of the support 52 can be adjusted so that all the supports 52 can touch the ground, thereby achieving the purpose of facilitating the adjustment of the stability of the negative pressure chamber body 1.
[0050] 4. By setting the partition 113, the centrifugal fan 112 continuously transports air between the partition 113 and the high-efficiency filter 3. Since the air cannot spread downward, a high-pressure area is formed between the high-efficiency filter 3 and the partition 113, which can pressurize the air to quickly pass through the high-efficiency filter 3. Since the air pressure is relatively high, the air that has just passed through the centrifugal fan 112 and entered the top of the partition 113 will be squeezed, making it difficult to spread around and collide with the air in the high-pressure area, thereby reducing wind noise to a certain extent.
[0051] 5. By setting the baffle 123, when the purified clean air flows in the direction of the second exhaust hole 122, it is blocked by the baffle 123 and then turns again, thereby downward through the first exhaust hole 121 into the negative pressure chamber body 1, and a small amount of clean air passes through the gap under the baffle 123 and is then discharged from the second exhaust hole 122, thereby reducing the discharged air to a certain extent, making the pressure difference between the negative pressure chamber body 1 and the outside smaller, and avoiding a large amount of unclean air from entering the negative pressure chamber body 1.
[0052] 6. By setting up the air guide cover 124, the air guide cover 124 guides the clean air discharged through the second exhaust hole 122 to the front side of the curtain 4. Therefore, the air outside the front side of the negative pressure chamber body 1 is relatively clean. Even if the external air enters the negative pressure chamber body 1 through the curtain 4, it is relatively clean, which can ensure the cleanliness of the negative pressure chamber body 1.
Claims
1. A negative pressure weighing chamber that is easy to adjust, comprising a negative pressure chamber body (1) consisting of a rear cavity (11) and an upper cavity (12), wherein the upper cavity (12) is fixedly connected to the top of the rear cavity (11) and is internally connected, characterized in that: A first filter cavity (111) is fixedly connected to the bottom of the front side of the inner wall of the rear cavity (11), a primary filter (2) is fixedly installed inside the first filter cavity (111), a centrifugal fan (112) is fixedly installed on the inner wall of the rear cavity (11), a second filter cavity (115) is fixedly connected to the upper part of the front side of the inner wall of the rear cavity (11), an air inlet (116) is provided at the bottom of the second filter cavity (115), a high-efficiency filter (3) is fixedly installed inside the second filter cavity (115), an air outlet of the centrifugal fan (112) faces the air inlet (116), a first exhaust hole (121) is provided at the bottom of the upper cavity (12), and a second exhaust hole (122) is provided on the front side of the upper cavity (12).
2. The easily adjustable negative pressure weighing chamber according to claim 1, characterized in that: A partition plate (113) is fixedly connected to the inner wall of the rear cavity (11), a hole groove (114) is provided on the top of the partition plate (113), and an air outlet of the centrifugal fan (112) is connected to the hole groove (114).
3. The easily adjustable negative pressure weighing chamber according to claim 1, characterized in that: Two mounting openings are provided on the front side of the rear cavity (11), and the two mounting openings are respectively connected to the first filter cavity (111) and the second filter cavity (115), and a first positioning plate (21) is fixedly installed in the mounting opening connected to the first filter cavity (111), and a second positioning plate (31) is fixedly installed in the mounting opening connected to the second filter cavity (115).
4. The easily adjustable negative pressure weighing chamber according to claim 3, characterized in that: The first positioning plate (21) is fixedly connected to first fixing blocks (22) at both upper and lower sides, and the second positioning plate (31) is fixedly connected to second fixing blocks (32) at both upper and lower sides.
5. The easily adjustable negative pressure weighing chamber according to claim 1, characterized in that: A baffle (123) is fixedly connected to the top of the front side of the inner wall of the upper cavity (12), and a gap exists between the bottom of the baffle (123) and the bottom of the inner wall of the upper cavity (12).
6. The easily adjustable negative pressure weighing chamber according to claim 1 or 5, characterized in that: The front side of the upper cavity (12) is fixedly connected with an air guide cover (124).
7. The easily adjustable negative pressure weighing chamber according to claim 1, characterized in that: The bottom of the front side of the upper cavity (12) is fixedly connected to a barrier curtain (4) fixedly mounted thereon.
8. The easily adjustable negative pressure weighing chamber according to claim 1, characterized in that: The four corners of the outer wall of the negative pressure chamber body (1) are fixedly connected with positioning cylinders (5), the internal thread of the positioning cylinder (5) is connected with a screw rod (51), and the bottom end of the screw rod (51) is fixedly connected with a support (52).