CN108317283A - A kind of adjustable positive/negative-pressure filtering protecting device for tank - Google Patents
A kind of adjustable positive/negative-pressure filtering protecting device for tank Download PDFInfo
- Publication number
- CN108317283A CN108317283A CN201810318525.8A CN201810318525A CN108317283A CN 108317283 A CN108317283 A CN 108317283A CN 201810318525 A CN201810318525 A CN 201810318525A CN 108317283 A CN108317283 A CN 108317283A
- Authority
- CN
- China
- Prior art keywords
- positive
- pressure
- negative
- positive pressure
- valve body
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000001914 filtration Methods 0.000 title abstract description 10
- 238000003825 pressing Methods 0.000 claims abstract description 18
- 238000012856 packing Methods 0.000 claims description 6
- 238000006243 chemical reaction Methods 0.000 description 6
- 238000007789 sealing Methods 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000001228 spectrum Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000013589 supplement Substances 0.000 description 2
- 235000013405 beer Nutrition 0.000 description 1
- 235000013361 beverage Nutrition 0.000 description 1
- 229960000074 biopharmaceutical Drugs 0.000 description 1
- 210000000481 breast Anatomy 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- JEGUKCSWCFPDGT-UHFFFAOYSA-N h2o hydrate Chemical compound O.O JEGUKCSWCFPDGT-UHFFFAOYSA-N 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 230000001012 protector Effects 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
- F16K17/20—Excess-flow valves
- F16K17/22—Excess-flow valves actuated by the difference of pressure between two places in the flow line
- F16K17/24—Excess-flow valves actuated by the difference of pressure between two places in the flow line acting directly on the cutting-off member
- F16K17/28—Excess-flow valves actuated by the difference of pressure between two places in the flow line acting directly on the cutting-off member operating in one direction only
- F16K17/30—Excess-flow valves actuated by the difference of pressure between two places in the flow line acting directly on the cutting-off member operating in one direction only spring-loaded
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D35/00—Filtering devices having features not specifically covered by groups B01D24/00 - B01D33/00, or for applications not specifically covered by groups B01D24/00 - B01D33/00; Auxiliary devices for filtration; Filter housing constructions
- B01D35/02—Filters adapted for location in special places, e.g. pipe-lines, pumps, stop-cocks
- B01D35/04—Plug, tap, or cock filters filtering elements mounted in or on a faucet
- B01D35/046—Plug, tap, or cock filters filtering elements mounted in or on a faucet the filtering element being mounted in the faucet plug
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K27/00—Construction of housing; Use of materials therefor
- F16K27/02—Construction of housing; Use of materials therefor of lift valves
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
Abstract
The present invention proposes a kind of adjustable positive/negative-pressure filtering protecting device for tank; including lower valve body; the lower valve body upper end is equipped with upper valve body; the lower valve body bottom cavity is equipped with positive pressure valve seat upward; the positive pressure valve seat is equipped with positive pressure flap; upper valve body stage casing card is equipped with positive pressing spring between the positive pressure flap and card；Positive pressure flap center is equipped with through-hole, the through-hole is uniformly distributed on peripheries with negative pressure hole, valve rod is equipped in the through-hole, the positive pressure flap is equipped with the negative pressure flap being connected for closing through-hole with valve rod towards one end of positive pressure valve seat, the valve rod other end, which is equipped with, adjusts screw thread, the adjusting screw thread is equipped with gasket and nut, and the negative pressure spring to offset with gasket and positive pressure flap is cased on the valve rod；The upper valve body upper end is equipped with cartridge filter.The configuration of the present invention is simple, good airproof performance can carry out pressure release and balance negative pressure to tank body when needed, while can be filtered to the gas for compensating into tank body, and can adjust its positive/negative pressure.
Description
Technical field
The present invention relates to bio-pharmaceuticals, breast, food, flavouring, beer, beverage, fine design, daily chemical product field,
Protecting device for tank is filtered more particularly to a kind of adjustable positive/negative-pressure.
Background technology
Retort can be used in many chemical and medicine industry apparatus fields, but retort is often produced inside it at work
Raw pressure is just likely to result in the serious safety accident of tank body explosion, such as reacts if tank interior pressure is more than its upper limit
Tank body cools down after the completion, tank body hypotony, and external pressure can then be more than tank interior pressure, and at this moment tank body will be by one
A extruding force from atmospheric pressure, if inside and outside differential pressure reaches certain numerical value, tank body will be flattened by atmospheric pressure, this is same
It is very serious safety accident.
In view of the above-mentioned problems, China Patent No. CN 201420320785.6 discloses a kind of positive/negative pressure protector, including it is interior
Cylinder, outer barrel, connecting tube, exhaust pipe, which is characterized in that have fluid-tight water in outer barrel, water level line is higher than inner cylinder bottom margin, by inner cylinder
Composition liquid seal structure is separated with outer barrel；Inner cylinder top is wide diameter portion, and wide diameter portion bore is more than inner cylinder lower part bore and is less than outer barrel
Diameter, the height of inner cylinder wide diameter portion is equal with the height of outer barrel water level decreasing when maximum methane quantity, and inner cylinder is with exhaust pipe same
On axial line and inner tube structure is symmetrical with the axial line；Connecting tube is connected to outer barrel, and connecting tube nozzle lower edge is higher than guarantor
Outer barrel fluid-tight water water level when protecting negative pressure；Exhaust pipe is connected to inner cylinder.
But the patent has the following problems, that is, fluid-tight may be only available for low pressure, but more demanding in some reactions,
The occasion required to reaction pressure is not just on probation, requires the occasion that cannot contact steam also and uncomfortable some special occasions
With, while when positive pressure carries out pressure release and negative pressure carries out ftercompction without filter effect, this is not just suitable for some to hygienic requirements pole
It is high or occasion.
Invention content
Based on the above issues, present invention aims at providing a kind of simple in structure, good airproof performance, can in tank body pressure mistake
Pressure release filtering is carried out when big, and can occur compensating pressure when negative pressure in tank body, while can be to compensating the gas into tank body
It is filtered, and the adjustable positive/negative-pressure filtering protecting device for tank of its positive/negative pressure can be adjusted.
In view of the above problems, providing following technical solution：A kind of adjustable positive/negative-pressure filtering protecting device for tank, including
The lower valve body being connected with tank body, the lower valve body upper end are equipped with the upper valve body that height is adjusted with its screw-thread fit, the lower valve body
Intracavity bottom is equipped with the positive pressure valve seat being arranged towards upper valve body, and the positive pressure valve seat is equipped with positive pressure valve seat fitted seal just
Pressure valve valve, upper valve body stage casing inner cavity are equipped with card with holes, and positive pressing spring is equipped between the positive pressure flap and card；Institute
State positive pressure flap center and be equipped with through-hole, the through-hole be uniformly distributed on peripheries with it is several be equipped with negative pressure hole, being equipped in the through-hole can be axial
The valve rod of sliding, the positive pressure flap towards one end of positive pressure valve seat be equipped with diameter be less than positive pressure flap, be connected with valve rod and with
The negative pressure flap that through-hole offsets for closing through-hole, the valve rod other end, which is equipped with, adjusts screw thread, and the adjusting screw thread is equipped with
Gasket and nut, are cased with negative pressure spring on the valve rod, and the negative pressure spring one end is supported on positive pressure flap, other end support
In on gasket；The upper valve body upper end is equipped with the cartridge filter for placing filter core, and barometric pipe is equipped at the top of the cartridge filter.
In above structure, since positive pressure is often often used during the reaction, also just needs often to adjust, pass through screw thread
The lower valve body and upper valve body of cooperation so that directly so that it is highly occurred between lower valve body by rotating upper valve body when adjusting positive pressure
Change and a pressure of positive pressing spring is adjusted to realize, easy to adjust quick, cartridge filter may filter that the gas of positive pressure discharge
Body and negative pressure draw back the gas in tank body, the clean level in can effectively protect environment and tank body, barometric pipe be used for it is big
Gas or miscellaneous equipment are connected.
The present invention is further arranged to, and the positive pressure spring force is more than negative pressure spring.
It in above structure, generally requires to require pressure size in some special reaction occasions, therefore positive pressing spring bullet
Power need to be selected larger to meet enough pressure regulation spectrums, and negative pressure often requires that smaller, therefore it is smaller that elastic force can be selected
Negative pressure spring meet the supplement of negative pressure.
The present invention is further arranged to, and the positive pressure flap and the one side of positive pressure valve seat contact seal are equipped with positive seal
Pad；The one side that the negative pressure flap contacts sealing with through-hole on positive pressure flap is equipped with negative-pressure dense packing.
In above structure, sealing performance can be improved in positive seal pad and negative-pressure dense packing.
The present invention is further arranged to, and the screw tip that adjusts is equipped with the clamp spring for preventing screw cap-falling.
In above structure, since the negative pressure Opening pressure of negative pressure flap is to be adjusted by nut, but be at work
The fortuitous event of screw cap-falling is avoided the occurrence of, therefore clamp spring is set so that its reliability greatly improves.
The present invention is further arranged to, and bulge loop is equipped at its outer rim of one end that the positive pressure flap offsets with positive pressing spring；
The upper valve body inner wall, which is equipped with, to close up, described to close up on the inner wall of the one end of card towards positive pressure valve seat, and the closing in is straight
Diameter is identical as bulge loop internal diameter, and the positive pressing spring realizes positioning by closing in and bulge loop.
In above structure, the center of avoidable positive pressing spring shifts with positive pressure flap and causes positive pressure flap normal
Work.
The present invention is further arranged to, and lower valve body upper end inner wall is equipped with internal thread, and the upper valve body lower end outer wall is set
There is external screw thread, the internal thread is mutually screwed with external screw thread to be connect.
Beneficial effects of the present invention：It, can be when pressure be excessive in tank body with easy to adjust, simple in structure, good airproof performance
Pressure release filtering is carried out, and can occur compensating pressure when negative pressure in tank body, while can be to compensating the gas progress into tank body
Filtering, and can conveniently adjust the unlatching size of its positive/negative pressure.
Description of the drawings
Fig. 1 is the cutting structural schematic diagram of the present invention.
Figure label meaning：10- lower valve bodies；11- positive pressure valve seats；12- positive pressure flaps；121- positive seal pads；122- is convex
Ring；13- through-holes；14- negative pressure holes；15- valve rods；16- negative pressure flaps；161- negative-pressure dense packings；17- adjusts screw thread；171- gaskets；
172- nuts；173- clamp springs；18- negative pressure springs；19- internal threads；20- upper valve bodies；21- cards；The positive pressing springs of 22-；23- is received
Mouthful；24- external screw threads；30- cartridge filters；31- filter cores；32- barometric pipes.
Specific implementation mode
With reference to the accompanying drawings and examples, the specific implementation mode of the present invention is described in further detail.Implement below
Example is not limited to the scope of the present invention for illustrating the present invention.
With reference to figure 1, a kind of adjustable positive/negative-pressure as shown in Figure 1 filters protecting device for tank, includes being connected with tank body
Lower valve body 10,10 upper end of the lower valve body are equipped with the upper valve body 20 that height is adjusted with its screw-thread fit, 10 inner cavity of the lower valve body
Bottom is equipped with the positive pressure valve seat 11 being arranged towards upper valve body 20, and the positive pressure valve seat 11 is equipped with and 11 fitted seal of positive pressure valve seat
Positive pressure flap 12,20 stage casing inner cavity of the upper valve body be equipped with card 21 with holes, between the positive pressure flap 12 and card 21
Equipped with positive pressing spring 22；12 center of positive pressure flap is equipped with through-hole 13, and the through-hole 13 is uniformly distributed on peripheries with several equipped with negative pressure
Hole 14, the through-hole 13 is interior to be equipped with axially slidable valve rod 15, and the positive pressure flap 12 is set towards one end of positive pressure valve seat 11
There is diameter to be less than positive pressure flap 12, be connected with valve rod 15 and offset the negative pressure flap 16 for closing through-hole 13 with through-hole 13, institute
It states 15 other end of valve rod and is equipped with adjusting screw thread 17, the adjusting screw thread 17 is equipped with gasket 171 and nut 172, the valve rod 17
On be cased with negative pressure spring 18, described 18 one end of negative pressure spring is supported on positive pressure flap 12, the other end is supported on gasket 171；
20 upper end of the upper valve body is equipped with the cartridge filter 30 for placing filter core 31, and 30 top of the cartridge filter is equipped with barometric pipe
32。
In above structure, since positive pressure is often often used during the reaction, also just needs often to adjust, pass through screw thread
The lower valve body 10 of cooperation and upper valve body 20 so that directly make it between lower valve body 10 by rotating upper valve body 20 when adjusting positive pressure
Height, which changes, is adjusted a pressure of positive pressing spring 22 to realize, easy to adjust quick, cartridge filter 30 may filter that
The gas and negative pressure of positive pressure discharge draw back the gas in tank body, the clean level in can effectively protect environment and tank body, and air pressure is put down
Weighing apparatus pipe 32 with air or miscellaneous equipment for being connected.
In the present embodiment, 22 elastic force of positive pressing spring is more than negative pressure spring 18.
It in above structure, generally requires to require pressure size in some special reaction occasions, therefore positive pressing spring 22
Elastic force need to select larger to meet enough pressure regulation spectrums, and negative pressure often require that it is smaller, therefore can be selected elastic force compared with
Small negative pressure spring 18 meets the supplement of negative pressure.
In the present embodiment, the one side that the positive pressure flap 12 contacts sealing with positive pressure valve seat 11 is equipped with positive seal pad 121；
The one side that the negative pressure flap 16 contacts sealing with through-hole 13 on positive pressure flap 12 is equipped with negative-pressure dense packing 161.
In above structure, sealing performance can be improved in positive seal pad 121 and negative-pressure dense packing 161.
In the present embodiment, 17 end of screw thread that adjusts is equipped with the clamp spring 173 for preventing nut 172 from falling off.
In above structure, since the negative pressure Opening pressure of negative pressure flap 16 is adjusted by nut 172, but working
When be the fortuitous event for avoiding the occurrence of nut 172 and falling off, therefore be arranged clamp spring 173 so that its reliability greatly improves.
In the present embodiment, bulge loop 122 is equipped at its outer rim of one end that the positive pressure flap 12 offsets with positive pressing spring 22；Institute
It states 20 inner wall of upper valve body and is equipped with closing in 23, described to close up 23 on the inner wall of the one end of card 21 towards positive pressure valve seat 11, institute
It is identical as 122 internal diameter of bulge loop to state 23 diameters that close up, the positive pressing spring 22 passes through 23 and the realization positioning of bulge loop 122 of closing up.
In above structure, the center of avoidable positive pressing spring 22 shifts with positive pressure flap 12 and leads to 12 nothing of positive pressure flap
Method works normally.
In the present embodiment, 10 upper end inner wall of the lower valve body is equipped with internal thread 19, and 20 lower end outer wall of the upper valve body is equipped with
External screw thread 24, the internal thread 19 are mutually screwed with external screw thread 24 and are connect.
Beneficial effects of the present invention：It, can be when pressure be excessive in tank body with easy to adjust, simple in structure, good airproof performance
Pressure release filtering is carried out, and can occur compensating pressure when negative pressure in tank body, while can be to compensating the gas progress into tank body
Filtering, and can conveniently adjust the unlatching size of its positive/negative pressure.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, without departing from the technical principles of the invention, several improvements and modifications can also be made, above-mentioned hypothesis these
Improvement and modification also should be regarded as protection scope of the present invention.
Claims (6)
- Include the lower valve body being connected with tank body 1. a kind of adjustable positive/negative-pressure filters protecting device for tank, it is characterised in that：It is described Lower valve body upper end is equipped with the upper valve body that height is adjusted with its screw-thread fit, and the lower valve body intracavity bottom is equipped with and is set towards upper valve body The positive pressure valve seat set, the positive pressure valve seat are equipped with positive pressure flap with positive pressure valve seat fitted seal, in the upper valve body stage casing Chamber is equipped with card with holes, and positive pressing spring is equipped between the positive pressure flap and card；Positive pressure flap center is equipped with through-hole, The through-hole be uniformly distributed on peripheries with it is several be equipped with negative pressure hole, axially slidable valve rod, the positive pressure flap are equipped in the through-hole It is less than positive pressure flap equipped with diameter towards one end of positive pressure valve seat, is connected with valve rod and is offseted with through-hole for closing the negative of through-hole Pressure valve valve, the valve rod other end, which is equipped with, adjusts screw thread, and the adjusting screw thread is equipped with gasket and nut, is cased on the valve rod Negative pressure spring, the negative pressure spring one end is supported on positive pressure flap, the other end is supported on gasket；The upper valve body upper end is set It is useful for placing the cartridge filter of filter core, barometric pipe is equipped at the top of the cartridge filter.
- 2. a kind of adjustable positive/negative-pressure according to claim 1 filters protecting device for tank, it is characterised in that：The positive pressure Spring force is more than negative pressure spring.
- 3. a kind of adjustable positive/negative-pressure according to claim 2 filters protecting device for tank, it is characterised in that：The positive pressure Flap and the one side of positive pressure valve seat contact seal are equipped with positive seal pad；The negative pressure flap contacts close with through-hole on positive pressure flap The one side of envelope is equipped with negative-pressure dense packing.
- 4. a kind of adjustable positive/negative-pressure according to claim 3 filters protecting device for tank, it is characterised in that：The adjusting Screw tip is equipped with the clamp spring for preventing screw cap-falling.
- 5. a kind of adjustable positive/negative-pressure according to claim 4 filters protecting device for tank, it is characterised in that：The positive pressure Bulge loop is equipped at its outer rim of one end that flap offsets with positive pressing spring；The upper valve body inner wall, which is equipped with, to close up, and the closing in is located at Card is towards on the inner wall of one end of positive pressure valve seat, and the closing in diameter is identical as bulge loop internal diameter, and the positive pressing spring passes through receipts Mouth and bulge loop realize positioning.
- 6. a kind of adjustable positive/negative-pressure according to claim 5 filters protecting device for tank, it is characterised in that：The lower valve Body upper end inner wall is equipped with internal thread, and the upper valve body lower end outer wall is equipped with external screw thread, and the internal thread is mutually screwed with external screw thread Connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810318525.8A CN108317283A (en) | 2018-04-11 | 2018-04-11 | A kind of adjustable positive/negative-pressure filtering protecting device for tank |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810318525.8A CN108317283A (en) | 2018-04-11 | 2018-04-11 | A kind of adjustable positive/negative-pressure filtering protecting device for tank |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108317283A true CN108317283A (en) | 2018-07-24 |
Family
ID=62897248
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810318525.8A Pending CN108317283A (en) | 2018-04-11 | 2018-04-11 | A kind of adjustable positive/negative-pressure filtering protecting device for tank |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108317283A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112387031A (en) * | 2020-10-28 | 2021-02-23 | 河北化工医药职业技术学院 | A exhaust gas filtering device for chemical production |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4408357A1 (en) * | 1994-03-14 | 1995-09-21 | Ralf Dr Ing Teichmann | Safety pressure valve for container |
| CN104373648A (en) * | 2014-11-08 | 2015-02-25 | 合肥天鹅制冷科技有限公司 | Multifunctional safety isolation valve for expansion water tank |
| JP2015148173A (en) * | 2014-02-05 | 2015-08-20 | 浜名湖電装株式会社 | Check valve device and evaporated fuel supply system with the same |
| CN104896159A (en) * | 2015-06-05 | 2015-09-09 | 浙江嘉隆机械设备有限公司 | Full-ball type rollover and overflow resistant breathing valve |
| CN204916779U (en) * | 2015-08-20 | 2015-12-30 | 永一阀门集团有限公司 | Type of respiration relief valve |
| CN206754514U (en) * | 2017-04-12 | 2017-12-15 | 三阳工业股份有限公司 | Two-way valve |
| CN208058057U (en) * | 2018-04-11 | 2018-11-06 | 温州达尔捷机械制造有限公司 | A kind of adjustable positive/negative-pressure filtering protecting device for tank |
-
2018
- 2018-04-11 CN CN201810318525.8A patent/CN108317283A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4408357A1 (en) * | 1994-03-14 | 1995-09-21 | Ralf Dr Ing Teichmann | Safety pressure valve for container |
| JP2015148173A (en) * | 2014-02-05 | 2015-08-20 | 浜名湖電装株式会社 | Check valve device and evaporated fuel supply system with the same |
| CN104373648A (en) * | 2014-11-08 | 2015-02-25 | 合肥天鹅制冷科技有限公司 | Multifunctional safety isolation valve for expansion water tank |
| CN104896159A (en) * | 2015-06-05 | 2015-09-09 | 浙江嘉隆机械设备有限公司 | Full-ball type rollover and overflow resistant breathing valve |
| CN204916779U (en) * | 2015-08-20 | 2015-12-30 | 永一阀门集团有限公司 | Type of respiration relief valve |
| CN206754514U (en) * | 2017-04-12 | 2017-12-15 | 三阳工业股份有限公司 | Two-way valve |
| CN208058057U (en) * | 2018-04-11 | 2018-11-06 | 温州达尔捷机械制造有限公司 | A kind of adjustable positive/negative-pressure filtering protecting device for tank |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112387031A (en) * | 2020-10-28 | 2021-02-23 | 河北化工医药职业技术学院 | A exhaust gas filtering device for chemical production |
| CN112387031B (en) * | 2020-10-28 | 2021-08-27 | 河北化工医药职业技术学院 | A exhaust gas filtering device for chemical production |
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