CN107842969A - A kind of new blower fan with bypass valve - Google Patents
A kind of new blower fan with bypass valve Download PDFInfo
- Publication number
- CN107842969A CN107842969A CN201711172427.XA CN201711172427A CN107842969A CN 107842969 A CN107842969 A CN 107842969A CN 201711172427 A CN201711172427 A CN 201711172427A CN 107842969 A CN107842969 A CN 107842969A
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- China
- Prior art keywords
- bypass
- air channel
- cylindrical shell
- filter assemblies
- air
- 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.)
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- 238000000429 assembly Methods 0.000 claims abstract description 47
- 230000000712 assembly Effects 0.000 claims abstract description 47
- 238000009434 installation Methods 0.000 claims abstract description 9
- 238000001514 detection method Methods 0.000 claims description 15
- 239000002245 particle Substances 0.000 claims description 3
- 238000005299 abrasion Methods 0.000 abstract description 5
- 230000002000 scavenging effect Effects 0.000 abstract description 3
- 238000005192 partition Methods 0.000 description 12
- 238000001914 filtration Methods 0.000 description 10
- 238000005457 optimization Methods 0.000 description 9
- 238000011084 recovery Methods 0.000 description 8
- 230000008859 change Effects 0.000 description 4
- 238000007789 sealing Methods 0.000 description 4
- 238000000746 purification Methods 0.000 description 3
- 230000007704 transition Effects 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000000686 essence Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F7/00—Ventilation
- F24F7/04—Ventilation with ducting systems, e.g. by double walls; with natural circulation
- F24F7/06—Ventilation with ducting systems, e.g. by double walls; with natural circulation with forced air circulation, e.g. by fan positioning of a ventilator in or against a conduit
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/02—Ducting arrangements
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/20—Casings or covers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/28—Arrangement or mounting of filters
Abstract
The invention discloses a kind of new blower fan with bypass valve, belong to new Fan Equipment technical field.The new blower fan scavenging efficiency of prior art is relatively low, complicated, cumbersome.A kind of new blower fan with bypass valve, including blast pipe, filter assemblies and bypass air channel, the filter assemblies are installed with respect to the mouth of pipe of blast pipe, the bypass air channel is arranged side by side with filter assemblies and communicated with blast pipe, bypass air channel installation one can close the cylindrical shell in bypass air channel, the cylindrical shell connects a motor, the present invention sets cylindrical shell, pass through the rotation of motor control cylindrical shell, bypass passageways can be turned on or off in time, the measured outdoor air of matter is allowd to be directly entered air outlet, the utilization rate of filter assemblies can be reduced, so as to reduce the abrasion to filter assemblies, effectively extend the service life of filter assemblies, reduce use cost.
Description
Technical field
The present invention relates to a kind of new blower fan with bypass valve, belong to new Fan Equipment technical field.
Background technology
Known new wind devices, it is sent into after by filter assemblies, outdoor air is purified indoor.If work as Outdoor Air Quality
More excellent, during without by filtering component filters air, filter assemblies are but continuously in filtration condition, can shorten filter assemblies and use
Cycle.
Chinese patent（Application number 200720195818.9）Disclose a kind of novel energy recovery fresh-air ventilation of band bypass
Machine, including heat recovery core, its both sides are respectively provided with one piece of dividing plate, and the diagonal positions of first partition and second partition are provided with fresh air
Another diagonal positions of air inlet and fresh air air outlet, second partition and first partition are provided with air draft air inlet and air draft air-out
Mouthful, middle on the outside of first partition and second partition to be inserted with the 3rd dividing plate, heat recovery core both ends are respectively arranged with a bypass
Air channel.First partition and second partition are respectively arranged with heat recovery core and bypass air channel both sides, in the first partition upper right corner
Provided with fresh air air inlet, the lower left corner of second partition is provided with fresh air air outlet (not shown), and the upper right corner of second partition is set
There is air draft air inlet, the lower left corner of first partition is provided with air draft air outlet.Indoor and outdoor energy friendship need not be carried out in transition season
When changing, fresh air and air draft can without heat exchange, therefore can without heat recovery core, directly from bypass air channel by,
One piece of choke plate is respectively now inserted in each air port of heat recovery core, to prevent fresh air or air draft from passing through core body, forces fresh air
Pass through with air draft from bypass passageways.
Above-mentioned technical proposal is used for when transition season need not carry out indoor and outdoor energy exchange, and fresh air and air draft can be with
Not by core body, from bypass passageways by, so as to reduce the abrasion to core body, substantially prolongs its service life, although and
Purposes, the solution problem of the present invention is different, but has certain similar place with the thinking of the present invention solved the problems, such as.
Such scheme is provided with bypass air channel, when transition season need not carry out indoor and outdoor energy exchange, it is not necessary to pass through
, it is necessary to respectively insert one piece of choke plate in each air port of heat recovery core when crossing heat recovery core, to prevent fresh air or air draft from passing through
Core body is crossed, forces fresh air and air draft to pass through from bypass passageways.This scheme needs to be operated manually, scavenging efficiency it is relatively low and
Need to plug multiple choke plates, it is complicated, it is cumbersome.Further, above-mentioned technical proposal, can not be turned on or off in time
Bypass passageways, when not opening in time, cause the unnecessary loss of core body；When closing not in time, second-rate air flows into chamber
It is interior, poor user experience will be caused, therefore be not suitable for the purified treatment applied to room air.
The content of the invention
The defects of for prior art, it is an object of the invention to provide a kind of utilization rate that can reduce filter assemblies,
So as to reduce the abrasion to filter assemblies, the relative tool that can be turned on or off bypass passageways in time for extending its service life
There is the new blower fan of bypass valve.
To achieve the above object, the technical scheme is that：
A kind of new blower fan with bypass valve, including blast pipe, filter assemblies and bypass air channel, the filter assemblies enter relatively
The mouth of pipe installation of airduct, the bypass air channel are arranged side by side with filter assemblies and communicated with blast pipe, bypass air channel installation
One can close the cylindrical shell in bypass air channel, and the cylindrical shell connects a motor, when air quality is not up to standard, motor driving
Cylindrical shell turns an angle, and closing bypass air channel, air passes through from filter assemblies；When air quality is up to standard, motor drives
Dynamic cylindrical shell rotates backward certain angle, opens bypass air channel, and air directly passes through from bypass air channel.
The present invention sets cylindrical shell, by the rotation of motor control cylindrical shell, can be turned on or off side in time
Circulation passage so that the measured outdoor air of matter can be directly entered air outlet, it is possible to reduce the utilization rate of filter assemblies, so as to subtract
The small abrasion to filter assemblies, the service life of filter assemblies is effectively extended, reduces use cost.
As optimization technique measure, the cylindrical shell is the cylindric shell body of a quarter, the half of the shell body
Footpath matches with bypassing the width in air channel, simple in construction, practical, is skillfully constructed, cylindrical shell difference lateral end seal bypass air channel,
Different seal applications can be realized, for the realization of other functions of the invention, there is provided architecture basics.
As optimization technique measure, the stretching wall to stretch out is set respectively inside and outside the shell body, it is described to stretch
Going out wall includes the upper stretching wall positioned at shell body upper end, the lower stretching wall positioned at shell body lower end, positioned at the side of shell body side
Stretching wall, stretching wall is set, and the rotation of shell body can seal bypass air channel simultaneously, simple in construction, practical.
As optimization technique measure, a square casing is set below the shell body, the square casing is uncovered box body,
Its surrounding sets the side wall stood upwards, and the side wall and the floor projection of lower stretching wall coincide so that are stretched under shell body
Going out wall can fit with side wall, realize effective sealing of bypass air channel lower end.
As optimization technique measure, the motor is fixedly mounted in the uncovered box body inner chamber so that structure of the present invention is more
It is compact, while the sealing effectiveness of cylindrical shell is not influenceed.The motor is stepper motor, and the end of its turning end and shell body is consolidated
Fixed connection, turning end drive shell body reciprocating rotation.
As optimization technique measure, the new blower fan sets dividing plate chamber, and the filter assemblies, filtering are installed in dividing plate chamber side
The one side of component one side and dividing plate chamber fits, and the another side of dividing plate chamber is relative with the another side of filter assemblies, and two
Space between person forms bypass air channel, and bypass air channel is arranged side by side with filter assemblies so that the present invention is compact-sized.
As optimization technique measure, the dividing plate chamber is outwardly to form a cavity for being used to install an air monitor,
The cavity is relative with cylindrical shell inner chamber so that structure of the present invention is compacter.
As optimization technique measure, the width of the cavity is less than the diameter length of cylindrical shell, chamber containment in cylindrical shell
If the air monitor.The present invention shuts down after a period of time is operated, and now, cylindrical shell is by motor from turn
Dynamic, the side stretching wall on the inside of cylindrical shell fits with dividing plate chamber and bypass doorframe respectively, the lower stretching wall on the inside of it with it is square
The side wall of housing fits, and forms closing space, bypass air channel is closed, in now air monitor is coated on by cylindrical shell
Face, can directly it be contacted with air after purification.And then the present invention starts operating, the air matter after air monitor detection filtering
Amount, because bypass air channel is closed, therefore the air detected is filtered air, outdoor air will not be detected, if detecting sky
Gas is bad, then filter assemblies need to change.Detection air quality is good, then the present invention shuts down, and cylindrical shell returns to original position
Put, the present invention starts operating.
As optimization technique measure, the air monitor is particle sensor, and its end face sets two detection mouths, two
Detection mouth gathers air simultaneously and detected so that testing result is more accurate.
As optimization technique measure, bypass air channel installation one is used for the bypass framework for setting up cylindrical shell, the side
Logical framework fits with dividing plate chamber, filter assemblies respectively, sets the weight of bypass framework support drum housing, while coordinates column
Housing seals to bypass air channel, makes its sealing effectiveness better.
Compared with prior art, the invention has the advantages that：
The present invention sets cylindrical shell, and by the rotation of motor control cylindrical shell, it is logical can be turned on or off bypass in time
Road so that the measured outdoor air of matter can be directly entered air outlet, it is possible to reduce the utilization rate of filter assemblies, so as to reduce pair
The abrasion of filter assemblies, the service life of filter assemblies is effectively extended, reduces use cost.
Further, the present invention sets air monitor, and cylindrical shell is rotated automatically by motor, the side on the inside of cylindrical shell
Stretching wall fits with dividing plate chamber and bypass doorframe respectively, and the side wall of lower stretching wall and square casing on the inside of it fits, shape
Into closing space, bypass air channel is closed, and now air monitor is coated on the inside by cylindrical shell, can be with air after purification
Directly contact.And then the present invention starts operating, air monitor detects the air quality after filtering, because bypass air channel is closed,
Therefore the air of detection is filtered air, will not detect outdoor air, if detecting that air is bad, filter assemblies need
Change.Detection air quality is good, then the present invention shuts down, and cylindrical shell returns to original position, and the present invention starts operating.
The present invention is rotated by motor control cylindrical shell, it is possible to achieve the conversion of the bypass three kinds of states in air channel, realizes room
Whether outer air needs filtering and whether filter assemblies need the intelligent prompt changed, compact-sized, practical, reduces new blower fan
Use cost, while scavenging efficiency is high, and Consumer's Experience is good.
Brief description of the drawings
Fig. 1 is overall structure diagram of the present invention；
Fig. 2 is overall structure diagram of the present invention（Do not include end cap）；
Fig. 3 is cylindrical shell structural representation of the present invention；
Fig. 4 is positive structure schematic of the present invention；
Fig. 4-1 is present invention bypass air channel closed mode structural representation（Original state）；
Fig. 4-2 is present invention bypass air channel opening structural representation；
Fig. 4-3 is present invention bypass air channel sealing state structural representation（Detection state）.
Description of reference numerals：
1- cylindrical shells, 2- blast pipes, 3- filter assemblies, 4- square casings, 5- air monitor, 6- bypass air channel, 7- air-supplies
Blower fan, 8- discharge pipes, 9- dividing plate chambers, the upper stretching walls of 11-, 12- sides stretching wall, stretching wall under 13-.
Embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, it is right below in conjunction with drawings and Examples
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
On the contrary, the present invention covers any replacement done in the spirit and scope of the present invention being defined by the claims, repaiied
Change, equivalent method and scheme.Further, in order that the public has a better understanding to the present invention, below to the thin of the present invention
It is detailed to describe some specific detail sections in section description.Part without these details for a person skilled in the art
Description can also understand the present invention completely.
It should be noted that when element is referred to as " being fixed on " another element, it can be directly on another element
Or there may also be element placed in the middle.When an element is considered as " connection " another element, it can be directly connected to
To another element or it may be simultaneously present centering elements.On the contrary, when element be referred to as " directly existing " another element " on " when,
In the absence of intermediary element.Term as used herein " on ", " under " and similar statement is for illustrative purposes only.
Unless otherwise defined, all of technologies and scientific terms used here by the article is with belonging to technical field of the invention
The implication that technical staff is generally understood that is identical.Term as used herein is intended merely to describe the purpose of specific embodiment, no
It is intended to the limitation present invention.
As Figure 1-4, a kind of new blower fan with bypass valve, including blast pipe 2, filter assemblies 3, bypass air channel 6, give
Wind blower fan 7, discharge pipe 8 and dividing plate chamber 9.The side of dividing plate chamber 9 is installed by the filter assemblies 3, the one side of filter assemblies 3 and dividing plate
The one side of chamber 9 fits, and the another side of dividing plate chamber 9 is relative with the another side of filter assemblies 3, space shape between the two
Into bypass air channel 6.The front end of the dividing plate chamber 9 opens up through hole, for installing blast pipe 2.The bypass air channel 6 installation one is used for
The bypass framework of cylindrical shell 1 is set up, the bypass framework fits with dividing plate chamber 9, filter assemblies 3 respectively.The filtering group
Part 3 includes mounting bracket, HEPA screen packs, activated charcoal strainer.
The filter assemblies 3 are installed with respect to the mouth of pipe of blast pipe 2, and the bypass air channel 6 is arranged side by side simultaneously with filter assemblies 3
Communicated with blast pipe 2, the bypass air channel 6 installation one can close the cylindrical shell 1 in bypass air channel 6, and the cylindrical shell 1 connects
Connect a motor, when air quality is not up to standard, motor driving cylindrical shell 1 turn an angle, closing bypass air channel 6, air from
Passed through in filter assemblies 3；When air quality is up to standard, motor driving cylindrical shell 1 rotates backward certain angle, opens bypass air channel
6, air directly passes through from bypass air channel 6.
The cylindrical shell 1 is the cylindric shell body of a quarter, the radius of the shell body and the width for bypassing air channel 6
Degree matches.The stretching wall to stretch out is set respectively inside and outside the shell body, and the stretching wall includes being located at shell
The upper stretching wall 11 of body upper end, the lower stretching wall 13 positioned at shell body lower end, the side stretching wall 12 positioned at shell body side.It is described
One square casing 4 is set below shell body, the square casing 4 is uncovered box body, and its surrounding sets the side wall stood upwards, under
Stretching wall 13 coincides with sidewall horizontal projection.The motor is fixedly mounted in the uncovered box body inner chamber, and the motor is
Stepper motor, its turning end are fixedly connected with the end of shell body, and turning end drives shell body reciprocating rotation.
The dividing plate chamber 9 is outwardly to form a cavity for being used to install an air monitor 5, the cavity and column shell
The inner chamber of body 1 is relative.The width of the cavity is less than the diameter length of cylindrical shell 1, and chamber containment sets the air inspection in cylindrical shell 1
Survey device 5.The air monitor 5 is particle sensor, and its end face sets two detection mouths.
The operation principle of the present invention：
Present invention bypass air channel original state embodiment, the cylindrical shell 1 as shown in Fig. 4-1（Thereon, lower surface is shaped as
Quadrant）, side stretching wall 12 on the outside of it fits with dividing plate chamber 9 and bypass doorframe respectively, the lower stretching wall 13 in outside
Fitted with the side wall of square casing 4, form closing space, bypass air channel 6 is closed, and now air monitor 5 is blocked in
Outside, can directly it be contacted with outdoor air.During present invention work, outdoor air, air detection are sucked by blast pipe 2
Device 5 detects outdoor air, is closed due to now bypassing air channel 6, outdoor air can not flow to air outlet without filter assemblies.
Present invention bypass air channel opening embodiment as shown in the Fig. 4-2, when the detection of air monitor 5 air quality is preferable
When, 45 ° of 1 rotate counterclockwise of motor control cylindrical shell, bypass air channel 6 is opened, and now filter assemblies are relative to the bypass side of air channel 6
Crushing is larger, and outdoor air is got in directly through bypass air channel 6；When air monitor 5 detects that outdoor air is poor,
Motor control cylindrical shell 1 is turned clockwise 45 °, and bypass air channel 6 is closed, and returns to original state, outdoor air is without filtering
Component can not flow to air outlet.
Present invention bypass air channel detection state embodiment, the present invention stop fortune after a period of time is operated as shown in Fig. 4-3
Turn, now, cylindrical shell 1 automatically rotates to detection state by motor, the side stretching wall 12 of the inner side of cylindrical shell 1 respectively with every
Plate chamber 9 and bypass doorframe fit, and the side wall of lower stretching wall 13 and square casing 4 on the inside of it fits, and forms closing space,
Bypass air channel 6 is closed, and now air monitor 5 is coated on the inside by cylindrical shell 1, can directly be connect with air after purification
Touch.And then the present invention starts operating, the air quality after the detection filtering of air monitor 5, because bypass air channel 6 is closed, therefore examines
The air of survey is filtered air, will not detect outdoor air, if detecting that air is bad, the filtering group of filter assemblies
Part needs to change.Detection air quality is good, then the present invention shuts down, and cylindrical shell 1 recovers to state shown in Fig. 4-1, this
Invention starts operating.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
All any modification, equivalent and improvement made within refreshing and principle etc., should be included in the scope of the protection.
Claims (10)
1. a kind of new blower fan with bypass valve, including blast pipe（2）, filter assemblies（3）And bypass air channel（6）, the mistake
Filter component（3）With respect to blast pipe（2）The mouth of pipe installation, it is characterised in that the bypass air channel（6）With filter assemblies（3）Side by side
Setting and and blast pipe（2）Communicate, the bypass air channel（6）Installation one can close bypass air channel（6）Cylindrical shell（1）,
The cylindrical shell（1）A motor is connected, when air quality is not up to standard, motor driving cylindrical shell（1）Turn an angle, seal
Close bypass air channel（6）, air is from filter assemblies（3）In pass through；When air quality is up to standard, motor driving cylindrical shell（1）Reversely
Turn an angle, open bypass air channel（6）, air is directly from bypass air channel（6）Pass through.
A kind of 2. new blower fan with bypass valve as claimed in claim 1, it is characterised in that the cylindrical shell（1）For four
/ mono- columned shell body, radius and the bypass air channel of the shell body（6）Width match.
3. a kind of new blower fan with bypass valve as claimed in claim 2, it is characterised in that inside and outside the shell body
The stretching wall to stretch out is set respectively, and the stretching wall includes the upper stretching wall positioned at shell body upper end（11）, positioned at shell
The lower stretching wall of body lower end（13）, side stretching wall positioned at shell body side（12）.
4. a kind of new blower fan with bypass valve as claimed in claim 3, it is characterised in that one is set below the shell body
Square casing（4）, the square casing（4）For uncovered box body, its surrounding sets the side wall stood upwards, and the side wall is stretched with
Go out wall（1）Floor projection coincide.
5. a kind of new blower fan with bypass valve as claimed in claim 4, it is characterised in that the uncovered box body inner chamber is fixed
The motor is installed, the motor is stepper motor, and its turning end is fixedly connected with the end of shell body, and turning end drives shell
Body reciprocating rotation.
6. one kind as described in claim 1-5 is any has cylindrical shell（1）New blower fan, it is characterised in that the fresh air
Machine sets dividing plate chamber（9）, dividing plate chamber（9）Side is installed by the filter assemblies（3）, filter assemblies（3）One side and dividing plate chamber（9）
One side fit, dividing plate chamber（9）Another side and filter assemblies（3）Another side it is relative, space between the two
Form bypass air channel（6）.
A kind of 7. new blower fan with bypass valve as claimed in claim 6, it is characterised in that the dividing plate chamber（9）Convex
Go out to be formed one be used for install an air monitor（5）Cavity, the cavity and cylindrical shell（1）Inner chamber is relative.
8. a kind of new blower fan with bypass valve as claimed in claim 7, it is characterised in that the width of the cavity is less than post
Shape housing（1）Diameter length, cylindrical shell（1）Interior chamber containment sets the air monitor（5）.
A kind of 9. new blower fan with bypass valve as claimed in claim 8, it is characterised in that the air monitor（5）For
Particle sensor, its end face set two detection mouths.
A kind of 10. new blower fan with bypass valve as claimed in claim 9, it is characterised in that the bypass air channel（6）Installation
One is used to set up cylindrical shell（1）Bypass framework, it is described bypass framework respectively with dividing plate chamber（9）, filter assemblies（3）It is affixed
Close.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711172427.XA CN107842969A (en) | 2017-11-22 | 2017-11-22 | A kind of new blower fan with bypass valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711172427.XA CN107842969A (en) | 2017-11-22 | 2017-11-22 | A kind of new blower fan with bypass valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107842969A true CN107842969A (en) | 2018-03-27 |
Family
ID=61680069
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711172427.XA Pending CN107842969A (en) | 2017-11-22 | 2017-11-22 | A kind of new blower fan with bypass valve |
Country Status (1)
| Country | Link |
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| CN (1) | CN107842969A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111503804A (en) * | 2020-04-24 | 2020-08-07 | 海宁市富连机械有限公司 | Ventilating device capable of automatically replacing filter disc |
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Application publication date: 20180327 |