CN112807977A - Early warning formula sulfur dioxide purifier - Google Patents
Early warning formula sulfur dioxide purifier Download PDFInfo
- Publication number
- CN112807977A CN112807977A CN202110039648.XA CN202110039648A CN112807977A CN 112807977 A CN112807977 A CN 112807977A CN 202110039648 A CN202110039648 A CN 202110039648A CN 112807977 A CN112807977 A CN 112807977A
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- Prior art keywords
- box
- purification
- bearing plate
- magnetic bearing
- sulfur dioxide
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/48—Sulfur compounds
- B01D53/50—Sulfur oxides
- B01D53/501—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound
- B01D53/502—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound characterised by a specific solution or suspension
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V5/00—Refractors for light sources
- F21V5/02—Refractors for light sources of prismatic shape
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V9/00—Elements for modifying spectral properties, polarisation or intensity of the light emitted, e.g. filters
- F21V9/08—Elements for modifying spectral properties, polarisation or intensity of the light emitted, e.g. filters for producing coloured light, e.g. monochromatic; for reducing intensity of light
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V9/00—Elements for modifying spectral properties, polarisation or intensity of the light emitted, e.g. filters
- F21V9/40—Elements for modifying spectral properties, polarisation or intensity of the light emitted, e.g. filters with provision for controlling spectral properties, e.g. colour, or intensity
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/18—Mountings, adjusting means, or light-tight connections, for optical elements for prisms; for mirrors
- G02B7/1805—Mountings, adjusting means, or light-tight connections, for optical elements for prisms; for mirrors for prisms
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/30—Alkali metal compounds
- B01D2251/304—Alkali metal compounds of sodium
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/60—Inorganic bases or salts
- B01D2251/604—Hydroxides
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/06—Polluted air
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Engineering & Computer Science (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Chemical & Material Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Analytical Chemistry (AREA)
- Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Biomedical Technology (AREA)
- Treating Waste Gases (AREA)
Abstract
The invention belongs to the field of air purification, and particularly relates to an early warning type sulfur dioxide purification device which comprises a purification box filled with a purification liquid, wherein an air outlet is formed in the upper end of the side wall of the purification box, a horizontally arranged magnetic bearing plate is connected in the purification box in a sealing and sliding manner, a magnet block which is homopolar and repulsive with the magnetic bearing plate is fixedly embedded in the lower bottom surface of the purification box, a vertically arranged transmission box is fixedly connected to the side wall of the purification box, a vertically arranged light bar is fixedly connected to the inner side wall of the transmission box, and a vertically arranged prism is rotatably connected between the upper bottom surface and the lower bottom surface of the transmission box. According to the invention, the partition plate is arranged, the initial arrangement direction of the partition plate is consistent with the axial direction of the conveying pipe, the triangular prism can rotate along with the continuous consumption of the purified solution at the upper end of the magnetic bearing plate, and when the purified solution is consumed completely, the triangular prism accumulates to drive the partition plate to rotate 90 degrees, so that the conveying pipe is completely closed, and the ineffective conveying of gas is blocked in time.
Description
Technical Field
The invention belongs to the field of air purification, and particularly relates to an early warning type sulfur dioxide purification device.
Background
Sulfur dioxide is one of the main atmospheric pollutants, mainly comes from mining industry, automobile exhaust and the like, a large amount of sulfur dioxide is also generated by burning a lot of fossil fuels, and if the air contains more sulfur dioxide, acid rain is easily formed, and the environment is greatly damaged.
In the work progress of some underground works, especially when the exploitation underground mine, because the comparatively sealed characteristics of underground working space, noxious gases such as sulfur dioxide that contain in the air are difficult in time to discharge, inhale a large amount of sulfur dioxide gas for a long time and cause great harm to underground staff's health easily, most traditional method is to replace underground air through the suction pump, however just need erect longer pipeline when underground work place degree of depth is too big, it is comparatively inconvenient to operate, in addition, can place air purification device and purify the air in some underground work places, some traditional air purification device only can be continuous and let in gas in to filtering the core, scrap the messenger and be difficult to discover again when the filter core, need frequent manual inspection that carries on, it is comparatively inconvenient to use.
Therefore, an early warning type sulfur dioxide purification device is provided to solve the problems.
Disclosure of Invention
The invention aims to provide an early warning type sulfur dioxide purification device aiming at the problem that most of traditional sulfur dioxide purification devices are inconvenient to use.
In order to achieve the purpose, the invention adopts the following technical scheme: an early warning type sulfur dioxide purification device comprises a purification box filled with a purification liquid, wherein an air outlet is formed in the upper end of the side wall of the purification box, a horizontally arranged magnetic bearing plate is connected in the purification box in a sealing and sliding manner, a magnet block which is repelled with the like pole of the magnetic bearing plate is fixedly embedded in the bottom surface of the purification box, a vertically arranged transmission box is fixedly connected to the side wall of the purification box, a vertically arranged light bar is fixedly connected to the inner side wall of the transmission box, a vertically arranged prism is rotatably connected between the upper bottom surface and the lower bottom surface of the transmission box, a gear is fixedly sleeved at the lower end of the prism, communication holes are formed in the side walls of the purification box and the transmission box together, one end of each communication hole is communicated with the transmission box, the other end of each communication hole is communicated with the space below the magnetic bearing plate, and a horizontally, the rack is meshed with the gear.
In foretell early warning formula sulfur dioxide purification device, magnetism bearing plate lower extreme is equipped with the intake pipe, magnetism bearing plate upper end fixedly connected with air intake plate, a plurality of holes with the intake pipe intercommunication are seted up to the lateral wall on the air intake plate.
In the above-mentioned early warning type sulfur dioxide purification device, a strip-shaped hole arranged in parallel with the triangular prism is provided on the side wall of the transmission box.
In foretell early warning formula sulfur dioxide purification device, the purifying box lower extreme is equipped with the conveyer pipe that the level set up, the one end and the fixed intercommunication of intake pipe of conveyer pipe, be equipped with the baffle in the conveyer pipe, the baffle passes through the lower extreme fixed connection of connecting rod and prism.
In foretell early warning formula sulfur dioxide purification device, be equipped with the baffle of fixed connection in the transmission box between lamp strip and the prism, light-transmitting strip has been seted up on the baffle.
Compared with the prior art, this early warning formula sulfur dioxide purifier's advantage lies in:
1. according to the invention, the magnetic bearing plate is arranged, the purified liquid is positioned at the upper end of the magnetic bearing plate, in an initial state, the repulsive force between the magnetic bearing plate and the magnet block in the purifying box and the gravity of the purified liquid on the magnetic bearing plate are in a balanced state, the purified liquid is a sodium hydroxide solution, and when gas containing sulfur dioxide is introduced, the following reactions can occur: 2NaOH + SO2＝Na2SO3+H2O, it is known from the equation that the weight of the entire solution is increased, and thus the magnetic bearing plate is moved downward against the repulsive force as the purification proceeds.
2. According to the invention, the light bar and the triple prisms are arranged, the triple prisms can enable polychromatic light to generate dispersion, so that when light of the light bar irradiates the triple prisms, light with various colors can be refracted from the other surface of the triple prisms, the various colored light is arranged in layers and is arranged according to the sequence of red, orange, yellow, green, blue, indigo and purple, the strip-shaped holes in the side wall of the transmission box only enable one colored light to be emitted, and therefore, the consumption degree of the purifying liquid can be judged according to the color of the emitted colored light.
3. According to the invention, the gear and the rack are arranged, air in the lower space of the magnetic bearing plate can be extruded in the descending process of the magnetic bearing plate, the rack in the communicating hole is pushed, the moving rack can drive the gear which is meshed and connected with the rack to rotate, so that the triangular prism is driven to rotate, when the triangular prism rotates, the angle of incident light of the light bar can be changed, the refracted colored light can also rotate along with the incident light, and the color of the colored light emitted from the strip-shaped hole can be changed.
4. According to the invention, the partition plate fixedly connected with the triangular prism is arranged, the initial arrangement direction of the partition plate is consistent with the axial direction of the conveying pipe, the triangular prism can rotate along with the continuous consumption of the purified solution at the upper end of the magnetic bearing plate, and when the purified solution is consumed completely, the triangular prism is accumulated to drive the partition plate to rotate 90 degrees, so that the conveying pipe is completely closed, and the ineffective conveying of the gas is blocked in time.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment 1 of an early warning type sulfur dioxide purification device provided by the invention;
FIG. 2 is a schematic diagram illustrating the dispersion of a prism in an embodiment 1 of the pre-warning sulfur dioxide purifying apparatus according to the present invention;
FIG. 3 is a schematic structural diagram of an embodiment 2 of an early warning type sulfur dioxide purifying apparatus provided by the present invention;
fig. 4 is a schematic structural diagram of a baffle plate in embodiment 2 of the early warning type sulfur dioxide purification device provided by the invention.
In the figure, 1 purifying box, 2 gas outlets, 3 magnetic bearing plates, 4 transmission boxes, 5 lamp strips, 6 triple prisms, 7 gears, 8 communication holes, 9 racks, 10 air inlet pipes, 11 air inlet discs, 12 strip-shaped holes, 13 conveying pipes, 14 partition plates, 15 connecting rods, 16 baffles and 17 light transmission strips.
Detailed Description
The following examples are for illustrative purposes only and are not intended to limit the scope of the present invention.
Example 1
As shown in fig. 1-2, an early warning type sulfur dioxide purifying device comprises a purifying box 1 filled with a purifying liquid, wherein the purifying liquid is a sodium hydroxide solution, an air outlet 2 is formed in the upper end of the side wall of the purifying box 1, a horizontally arranged magnetic bearing plate 3 is connected in the purifying box 1 in a sealing and sliding manner, a magnet block which is repelled with the same pole of the magnetic bearing plate 3 is fixedly embedded in the lower bottom surface of the purifying box 1, and in an initial state, the repulsive force between the magnetic bearing plate 3 and the magnet block in the purifying box 1 and the gravity of the purifying liquid on the magnetic bearing plate 3 are in a balanced state.
It should be noted that the lower end of the magnetic bearing plate 3 is provided with an air inlet pipe 10, the upper end of the magnetic bearing plate 3 is fixedly connected with an air inlet disc 11, the side wall of the air inlet disc 11 is provided with a plurality of holes communicated with the air inlet pipe 10, the air inlet disc 11 can thin conveyed gas, the gas is ensured to be fully contacted with the purifying liquid, and the purifying effect of the device is better.
The transmission box 4 of the vertical setting of 1 lateral wall fixedly connected with of purifying box, the lamp strip 5 of the vertical setting of 4 inside wall fixedly connected with of transmission box rotate between the bottom surface about the transmission box 4 and are connected with the prism 6 of vertical setting, it needs to be noted that set up the bar hole 12 with prism 6 parallel arrangement on the lateral wall of transmission box 4, bar hole 12 only enables a chromatic light and jets out.
The fixed cover of 6 lower extremes of prism is equipped with gear 7, has seted up intercommunicating pore 8 jointly on the lateral wall of purifying box 1 and transmission box 4, and the one end and the transmission box 4 intercommunication of intercommunicating pore 8, the other end and the below space intercommunication of magnetism bearing plate 3 of intercommunicating pore 8, the rack 9 of sealed sliding connection level setting in the intercommunicating pore 8, rack 9 and gear 7 meshing are connected.
The invention can be illustrated by the following operating modes:
when the invention is used, the purifying liquid is positioned at the upper end of the magnetic bearing plate 3, in the initial state, the repulsion force between the magnetic bearing plate 3 and the magnet block in the purifying box 1 and the gravity of the purifying liquid on the magnetic bearing plate 3 are in a balanced state, the purifying liquid is sodium hydroxide solution, and when gas containing sulfur dioxide is introduced, the following reactions can occur: 2NaOH + SO2＝Na2SO3+H2O, it is known from the equation that the weight of the entire solution is increased, and thus the magnetic bearing plate 3 is moved downward against the repulsive force as the purification proceeds.
The in-process that descends at magnetism bearing plate 3 can extrude the air in its lower part space, rack 9 to in the intercommunicating pore 8 produces the pushing action, the rack 9 that removes can drive the gear 7 rotation rather than the meshing is connected, thereby drive prism 6 and rotate, prism 6 enables polychromatic light and takes place the dispersion phenomenon, therefore when the light irradiation of lamp strip 5 was gone up to prism 6, the light of multiple colour can be refracted out to prism 6's another side, and multiple color light is that the layering is arranged and according to red, orange, yellow, green, blue, indigo, purple arranges in proper order.
When the prism 6 rotates, the angle of the incident light of the lamp strip 5 can be changed, and the refracted colored light can also rotate along with the incident light, so that the color of the colored light emitted from the strip-shaped hole 12 changes, and the strip-shaped hole 12 in the side wall of the transmission box 4 can only emit one colored light, so that the consumption degree of the purifying liquid can be judged according to the color of the emitted colored light, and the purifying liquid can be replaced in time.
Example 2
As shown in fig. 3 to 4, the present embodiment is different from embodiment 1 in that: the conveyer pipe 13 that the level set up is equipped with to purifying box 1 lower extreme, and the one end and the fixed intercommunication of intake pipe 10 of conveyer pipe 13 are equipped with baffle 14 in the conveyer pipe 13, and baffle 14 passes through connecting rod 15 and prism 6's lower extreme fixed connection.
What should be mentioned is that, be equipped with fixed connection baffle 16 in transmission box 4 between lamp strip 5 and the prism 6, seted up light-transmitting strip 17 on the baffle 16, light strip 17 can be selected and light on lamp strip 5 can be penetrated the straight on the prism 6 lateral wall, avoids astigmatic to dispersive adverse effect.
In this embodiment, the originated direction that sets up of baffle 14 keeps unanimous with conveyer pipe 13's axis direction, and along with the continuous consumption of 3 upper ends purifying solution of magnetism bearing plate, prism 6 can rotate thereupon, and when the purifying solution just in time consumed and finishes, prism 6 accumulation drove baffle 14 and has rotated 90, can seal conveyer pipe 13 completely, in time blocks gaseous invalid transport.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (5)
1. The early warning type sulfur dioxide purification device comprises a purification box (1) filled with a purification liquid, wherein a gas outlet (2) is formed in the upper end of the side wall of the purification box (1), and is characterized in that the purification box (1) is internally connected with a horizontally arranged magnetic bearing plate (3) in a sealing and sliding manner, a magnet block which is repelled with the magnetic bearing plate (3) in the same pole is fixedly embedded in the lower bottom surface of the purification box (1), the side wall of the purification box (1) is fixedly connected with a vertically arranged transmission box (4), the inner side wall of the transmission box (4) is fixedly connected with a vertically arranged light bar (5), a vertically arranged prism (6) is rotatably connected between the upper bottom surface and the lower bottom surface of the transmission box (4), a gear (7) is fixedly sleeved at the lower end of the prism (6), and communication holes (8) are formed in the side walls of the purification box (1) and the, one end of the communicating hole (8) is communicated with the transmission box (4), the other end of the communicating hole (8) is communicated with the space below the magnetic bearing plate (3), a rack (9) which is horizontally arranged is connected in the communicating hole (8) in a sealing and sliding mode, and the rack (9) is meshed with the gear (7) and is connected with the gear.
2. The early warning type sulfur dioxide purification device according to claim 1, wherein an air inlet pipe (10) is arranged at the lower end of the magnetic bearing plate (3), an air inlet disc (11) is fixedly connected to the upper end of the magnetic bearing plate (3), and a plurality of holes communicated with the air inlet pipe (10) are formed in the upper side wall of the air inlet disc (11).
3. The early warning type sulfur dioxide purification device according to claim 1, wherein the side wall of the transmission box (4) is provided with a strip-shaped hole (12) which is arranged in parallel with the triangular prism (6).
4. The early warning type sulfur dioxide purification device according to claim 3, wherein a horizontally arranged delivery pipe (13) is arranged at the lower end of the purification box (1), one end of the delivery pipe (13) is fixedly communicated with the air inlet pipe (10), a partition plate (14) is arranged in the delivery pipe (13), and the partition plate (14) is fixedly connected with the lower end of the triangular prism (6) through a connecting rod (15).
5. The early warning type sulfur dioxide purification device according to claim 4, wherein a baffle (16) fixedly connected in the transmission box (4) is arranged between the light bar (5) and the triangular prism (6), and a light-transmitting strip (17) is arranged on the baffle (16).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110039648.XA CN112807977A (en) | 2021-01-13 | 2021-01-13 | Early warning formula sulfur dioxide purifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110039648.XA CN112807977A (en) | 2021-01-13 | 2021-01-13 | Early warning formula sulfur dioxide purifier |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112807977A true CN112807977A (en) | 2021-05-18 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110039648.XA Pending CN112807977A (en) | 2021-01-13 | 2021-01-13 | Early warning formula sulfur dioxide purifier |
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| CN (1) | CN112807977A (en) |
Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB9008469D0 (en) * | 1989-04-19 | 1990-06-13 | Pall Corp | Porous,absorbent,multiple element diagnostic device |
| US20050173352A1 (en) * | 2002-05-01 | 2005-08-11 | Burrows John A. | Fluid purification |
| CN104698593A (en) * | 2015-02-10 | 2015-06-10 | 邓伟廷 | Prism display screen |
| CN207865407U (en) * | 2018-02-06 | 2018-09-14 | 上海汉洁环境工程有限公司 | Burner |
| CN109342409A (en) * | 2018-10-18 | 2019-02-15 | 天津中联融泰科技有限公司 | Sulfur dioxide detection device |
| CN208786138U (en) * | 2018-06-29 | 2019-04-26 | 河南中烟工业有限责任公司 | A kind of microwave dissolver waste gas purification apparatus |
| CN208860477U (en) * | 2018-09-19 | 2019-05-14 | 深圳立勤生物科技有限公司 | A kind of optical path detection structure for shade judgement |
| CN209465930U (en) * | 2019-01-29 | 2019-10-08 | 佛山市永立新机电有限公司 | One kind being automatically aligned to hole location device |
| CN110925697A (en) * | 2019-12-18 | 2020-03-27 | 张干 | Fire emergency light that security performance is high |
| CN210490905U (en) * | 2019-11-11 | 2020-05-08 | 图灵云(山东)物联科技有限公司 | Special wireless communication gateway for toilet |
| CN211235511U (en) * | 2019-10-11 | 2020-08-11 | 朱莹莹 | Tail gas detector for automobile quality detection |
| CN111729174A (en) * | 2020-08-04 | 2020-10-02 | 宫锡和 | Carbon dioxide absorbing device for circulation closed anesthesia machine |
| CN111828922A (en) * | 2020-07-24 | 2020-10-27 | 程宗照 | Dazzle various anti-dazzle type LED and bury lamp |
-
2021
- 2021-01-13 CN CN202110039648.XA patent/CN112807977A/en active Pending
Patent Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB9008469D0 (en) * | 1989-04-19 | 1990-06-13 | Pall Corp | Porous,absorbent,multiple element diagnostic device |
| US20050173352A1 (en) * | 2002-05-01 | 2005-08-11 | Burrows John A. | Fluid purification |
| CN104698593A (en) * | 2015-02-10 | 2015-06-10 | 邓伟廷 | Prism display screen |
| CN207865407U (en) * | 2018-02-06 | 2018-09-14 | 上海汉洁环境工程有限公司 | Burner |
| CN208786138U (en) * | 2018-06-29 | 2019-04-26 | 河南中烟工业有限责任公司 | A kind of microwave dissolver waste gas purification apparatus |
| CN208860477U (en) * | 2018-09-19 | 2019-05-14 | 深圳立勤生物科技有限公司 | A kind of optical path detection structure for shade judgement |
| CN109342409A (en) * | 2018-10-18 | 2019-02-15 | 天津中联融泰科技有限公司 | Sulfur dioxide detection device |
| CN209465930U (en) * | 2019-01-29 | 2019-10-08 | 佛山市永立新机电有限公司 | One kind being automatically aligned to hole location device |
| CN211235511U (en) * | 2019-10-11 | 2020-08-11 | 朱莹莹 | Tail gas detector for automobile quality detection |
| CN210490905U (en) * | 2019-11-11 | 2020-05-08 | 图灵云(山东)物联科技有限公司 | Special wireless communication gateway for toilet |
| CN110925697A (en) * | 2019-12-18 | 2020-03-27 | 张干 | Fire emergency light that security performance is high |
| CN111828922A (en) * | 2020-07-24 | 2020-10-27 | 程宗照 | Dazzle various anti-dazzle type LED and bury lamp |
| CN111729174A (en) * | 2020-08-04 | 2020-10-02 | 宫锡和 | Carbon dioxide absorbing device for circulation closed anesthesia machine |
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Application publication date: 20210518 |