CN109992050A - A kind of the dust circuit for detecting and server of blower fan filtering unit - Google Patents
A kind of the dust circuit for detecting and server of blower fan filtering unit Download PDFInfo
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- CN109992050A CN109992050A CN201910243305.8A CN201910243305A CN109992050A CN 109992050 A CN109992050 A CN 109992050A CN 201910243305 A CN201910243305 A CN 201910243305A CN 109992050 A CN109992050 A CN 109992050A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
- G01N27/041—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of a solid body
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
- G01N27/045—Circuits
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
- G06F1/16—Constructional details or arrangements
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Abstract
The invention discloses the dust circuit for detecting and server of a kind of blower fan filtering unit, comprising: alarming device；The first partial pressure electronic component on FFU in server；The DC power supply of itself access is divided in server, with the concatenated second partial pressure electronic component of the first partial pressure electronic component for dividing electronic component cooperation with first；Control module, for detecting the voltage at the first partial pressure electronic component both ends, when voltage is greater than predetermined voltage threshold, control alarming device issues the information warning for indicating that FFU is needed replacing, and refers to for staff.As it can be seen that the dust circuit for detecting of the application inspects periodically FFU without staff, to improve the efficiency of management of FFU.
Description
Technical field
The present invention relates to server admin fields, more particularly to the dust circuit for detecting and clothes of a kind of blower fan filtering unit
Business device.
Background technique
As server is using more and more extensive, server is no longer only limitted to be mounted on the stringent place of Environmental Regulation,
Also it is mounted on the loose normal office place of the Environmental Regulation even outdoor location without Environmental Regulation.But normal office place
It is more serious with the dust problem of outdoor location, cause the component of server internal to be easy sedimentating dust, when dust accumulation is excessive
Component can be caused to generate heat, or even a series of safety problem can be derived.
In the prior art, it usually adds in the server FFU (Fan Filter Unit, blower fan filtering unit), FFU is used
In filtering dust to reduce the Dust Capacity accumulated in server, but dust can be accumulated on FFU, so needing staff regular
It checks whether FFU needs replacing, the function of FFU is excessively influenced to avoid dust cumulant.But staff is every one section
Time, which can all take a certain time, checks FFU, causes the efficiency of management of FFU lower.
Therefore, how to provide a kind of scheme of solution above-mentioned technical problem is that those skilled in the art needs to solve at present
The problem of.
Summary of the invention
The object of the present invention is to provide the dust circuit for detecting and server of a kind of blower fan filtering unit, are not necessarily to staff
FFU is inspected periodically, to improve the efficiency of management of FFU.
In order to solve the above technical problems, the present invention provides a kind of dust circuit for detecting of blower fan filtering unit, comprising:
Alarming device；
Set on the first partial pressure electronic component in server on blower fan filtering unit FFU；
Electronic component is divided in the server, with the first partial pressure electronic component concatenated second, is used
In with the first partial pressure electronic component cooperation, the DC power supply accessed to itself is divided；
Control module is preset for detecting the voltage at first partial pressure electronic component both ends when the voltage is greater than
When voltage threshold, controls the alarming device and issue the information warning for indicating that FFU is needed replacing, referred to for staff.
Preferably, the first partial pressure electronic component is specially first resistor, the second partial pressure electronic component tool
Body is second resistance；Wherein:
The first end of the first resistor is connect with the first end of the second resistance, the second end of the second resistance with
The DC power supply connection, the second end ground connection of the first resistor.
Preferably, the control module includes:
The comparison circuit that input terminal is connect with the first end of the first resistor, for judging the first resistor both ends
Whether voltage is greater than predetermined voltage threshold, if so, generating high level signal；If it is not, then generating low level signal；
The controller being connect with the output end of the comparison circuit, for controlling after receiving the high level signal
The alarming device issues the information warning for indicating that FFU is needed replacing.
Preferably, the comparison circuit includes comparator, 3rd resistor and the 4th resistance；Wherein:
Input terminal of the input anode of the comparator as the comparison circuit, the input negative terminal difference of the comparator
It is connect with the first end of the first end of the 3rd resistor and the 4th resistance, the second end of the 3rd resistor and described straight
The connection of galvanic electricity source, the second end ground connection of the 4th resistance, output of the output end of the comparator as the comparison circuit
End.
Preferably, the control module includes:
The controller being connect with the first end of the first resistor, for utilizing software program by the first resistor both ends
Voltage make comparisons with predetermined voltage threshold, when the voltage be greater than the predetermined voltage threshold when, control the alarming device
Issue the information warning for indicating that FFU is needed replacing.
Preferably, the controller is specially the baseboard management controller BMC carried on mainboard in the server.
Preferably, the BMC is also used to that the replacement information of the FFU is written to described when the FFU is needed replacing
The system log of server, is checked for staff.
Preferably, the alarming device is specially the combined aural and visual alarm being set to outside the server.
In order to solve the above technical problems, the present invention also provides a kind of server, including FFU, it further include any of the above-described kind
The dust circuit for detecting of blower fan filtering unit.
The present invention provides a kind of dust circuit for detecting of blower fan filtering unit, comprising: alarming device；In server
The first partial pressure electronic component on FFU；Electronics is divided in server, with the first partial pressure electronic component concatenated second
Component, for the first partial pressure electronic component cooperation, the DC power supply accessed to itself to be divided；Control module is used
The voltage at electronic component both ends is divided in detection first, when voltage is greater than predetermined voltage threshold, control alarming device is issued
It indicates the information warning that FFU is needed replacing, is referred to for staff.
Direct impedance is caused to increase in view of the first partial pressure electronic component can be accumulated because of surface dust, so the application will
First partial pressure electronic component is set on FFU, and using accumulating on the voltage characterization FFU at the first partial pressure electronic component both ends
Dust Capacity.When the voltage at the first partial pressure electronic component both ends is greater than certain voltage threshold value, illustrate the Dust Capacity accumulated on FFU
Excessively, control module can control alarming device and issue the information warning for indicating that FFU is needed replacing in the case of this, to notify work
Personnel FFU is needed replacing.As it can be seen that the dust circuit for detecting of the application inspects periodically FFU without staff, to improve
The efficiency of management of FFU.
The present invention also provides a kind of servers, with above-mentioned dust circuit for detecting beneficial effect having the same.
Detailed description of the invention
It to describe the technical solutions in the embodiments of the present invention more clearly, below will be to institute in the prior art and embodiment
Attached drawing to be used is needed to be briefly described, it should be apparent that, the accompanying drawings in the following description is only some implementations of the invention
Example, for those of ordinary skill in the art, without creative efforts, can also obtain according to these attached drawings
Obtain other attached drawings.
Fig. 1 is a kind of structural schematic diagram of the dust circuit for detecting of blower fan filtering unit provided in an embodiment of the present invention；
Fig. 2 is the specific structure signal of the dust circuit for detecting of the first blower fan filtering unit provided in an embodiment of the present invention
Figure；
Fig. 3 is the specific structure signal of the dust circuit for detecting of second of blower fan filtering unit provided in an embodiment of the present invention
Figure.
Specific embodiment
Core of the invention is to provide the dust circuit for detecting and server of a kind of blower fan filtering unit, is not necessarily to staff
FFU is inspected periodically, to improve the efficiency of management of FFU.
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art
Every other embodiment obtained without making creative work, shall fall within the protection scope of the present invention.
Fig. 1 is please referred to, Fig. 1 is a kind of structure of the dust circuit for detecting of blower fan filtering unit provided in an embodiment of the present invention
Schematic diagram.
The dust circuit for detecting of the blower fan filtering unit includes:
Alarming device 1；
Set on the first partial pressure electronic component 2 in server on blower fan filtering unit FFU；
Electronic component 3 is divided in server, with the first partial pressure electronic component 2 concatenated second, for the
One partial pressure electronic component 2 cooperates, and divides to the DC power supply of itself access；
Control module 4, for detecting the voltage at the first partial pressure 2 both ends of electronic component, when voltage is greater than predeterminated voltage threshold
When value, control alarming device 1 issues the information warning for indicating that FFU is needed replacing, and refers to for staff.
It should be noted that the default of the application sets in advance, it is only necessary to which setting is primary, unless according to practical feelings
Condition needs to modify, and does not otherwise need to reset.
Specifically, the dust circuit for detecting of the blower fan filtering unit of the application includes that alarming device 1, first divides electronics member
Device 2, second divides electronic component 3 and control module 4, its working principle is that:
In view of when the device surface with resistive electronic component accumulates different Dust Capacities, electronic component
Impedance is different, specifically as the Dust Capacity that the device surface of electronic component is accumulated increases, the impedance of electronic component
It is gradually increased, so the application is using the Dust Capacity accumulated on FFU in partial pressure mode detection service device.
More specifically, the application is provided with the first partial pressure electronic component 2 of impedance on FFU in the server, due to
First partial pressure electronic component 2 and FFU are in same environment, so the device surface accumulation of the first partial pressure electronic component 2
The dust thickness accumulated of device surface of dust thickness and FFU it is roughly the same.The device of known first partial pressure electronic component 2
The Dust Capacity size of surface accumulation will affect the impedance of the first partial pressure electronic component 2, so the purpose of the application is to utilize the
The Dust Capacity variation of the device surface accumulation of the impedance variations characterization FFU of one partial pressure electronic component 2.
The application is also provided with the second partial pressure electronic component 3 of impedance in server, due to the second partial pressure electronics
Component 3 is set to server internal, so the Dust Capacity of the second partial pressure 3 surface of electronic component accumulation is seldom namely second point
Press the impedance of electronic component 3 is not influenced substantially by the Dust Capacity that surface is accumulated, and is considered as fixed value.
Based on this, the first end of the first partial pressure electronic component 2 of the application divides the first of electronic component 3 with second
End connection, the DC power supply of the second end access server of the second partial pressure electronic component 3, the first partial pressure electronic component 2
Second end ground connection, i.e., the first partial pressure electronic component 2 and the second partial pressure electronic component 3 form bleeder circuit, to DC power supply
Output voltage divided.It is understood that with the growth of server working time, the first partial pressure electronic component 2
Device surface accumulation Dust Capacity gradually increase (i.e. the Dust Capacity accumulated on FFU gradually increases), first partial pressure electronics member device
The impedance of part 2 is gradually increased, and the first partial pressure electronic component 2 dividing ratios shared in bleeder circuit are gradually increased, i.e., and the
The voltage at one partial pressure 2 both ends of electronic component is gradually increased, and detects the dust accumulated on FFU using partial pressure mode to realize
Amount.
In view of FFU is needed replacing when the Dust Capacity accumulated on FFU is excessive, excessively influenced to avoid dust cumulant
The function of FFU a, so voltage threshold, setting principle is arranged in the application are as follows: when the first partial pressure 2 both ends of electronic component
When voltage is greater than set voltage threshold, it is believed that the Dust Capacity accumulated on FFU is excessive, and FFU is needed replacing；Otherwise it is assumed that FFU is not necessarily to
Replacement.Based on this, control module 4 and alarming device 1, the detectable first partial pressure electronic component 2 of control module 4 is arranged in the application
The voltage at both ends, and the voltage at the first partial pressure 2 both ends of electronic component is made comparisons with set voltage threshold, when the first partial pressure electricity
When the voltage at sub- 2 both ends of component is greater than set voltage threshold, illustrate that FFU is needed replacing, then controls alarming device 1 and issue expression
The information warning that FFU is needed replacing, so that staff be made to replace in time to FFU after receiving information warning.
As it can be seen that the dust circuit for detecting of the application can actively judge whether the FFU in server needs replacing, and in FFU
Information warning is issued when needing replacing in time, to remind staff FFU that there are dust problems, is needed replacing, without work
FFU is inspected periodically as personnel, and then improves the efficiency of management of FFU.
The present invention provides a kind of dust circuit for detecting of blower fan filtering unit, comprising: alarming device；In server
The first partial pressure electronic component on FFU；Electronics is divided in server, with the first partial pressure electronic component concatenated second
Component, for the first partial pressure electronic component cooperation, the DC power supply accessed to itself to be divided；Control module is used
The voltage at electronic component both ends is divided in detection first, when voltage is greater than predetermined voltage threshold, control alarming device is issued
It indicates the information warning that FFU is needed replacing, is referred to for staff.
Direct impedance is caused to increase in view of the first partial pressure electronic component can be accumulated because of surface dust, so the application will
First partial pressure electronic component is set on FFU, and using accumulating on the voltage characterization FFU at the first partial pressure electronic component both ends
Dust Capacity.When the voltage at the first partial pressure electronic component both ends is greater than certain voltage threshold value, illustrate the Dust Capacity accumulated on FFU
Excessively, control module can control alarming device and issue the information warning for indicating that FFU is needed replacing in the case of this, to notify work
Personnel FFU is needed replacing.As it can be seen that the dust circuit for detecting of the application inspects periodically FFU without staff, to improve
The efficiency of management of FFU.
On the basis of the above embodiments:
Referring to figure 2., Fig. 2 is the tool of the dust circuit for detecting of the first blower fan filtering unit provided in an embodiment of the present invention
Body structural schematic diagram.
As a kind of optionally embodiment, the first partial pressure electronic component 2 is specially first resistor R1, the second partial pressure electronics
Component 3 is specially second resistance R2；Wherein:
The first end of first resistor R1 is connect with the first end of second resistance R2, the second end and direct current of second resistance R2
Source connection, the second end ground connection of first resistor R1.
Specifically, the first partial pressure electronic component 2 of the application and the second partial pressure electronic component 3 can select electricity
Resistance, structure is simple, and price is lower.In addition, the first resistor R1 of the application may include and multiple be uniformly distributed on FFU, is in parallel
The sub- resistance of connection, to detect the Dust Capacity that different location is accumulated on FFU, and the powder that different location is accumulated on comprehensive FFU
Dust quantity situation determines whether FFU needs replacing.
As one kind, optionally embodiment, control module 4 include:
The comparison circuit that input terminal is connect with the first end of first resistor R1, for judging the voltage at the both ends first resistor R1
Whether predetermined voltage threshold is greater than, if so, generating high level signal；If it is not, then generating low level signal；
The controller being connect with the output end of comparison circuit, for controlling alarming device 1 after receiving high level signal
Issue the information warning for indicating that FFU is needed replacing.
Specifically, the control module 4 of the application includes comparison circuit and controller, its working principle is that:
The voltage input at the both ends first resistor R1 is to comparison circuit, and comparison circuit is in the electricity for receiving the both ends first resistor R1
It is made comparisons with predetermined voltage threshold after pressure, it is more electric when the voltage at the both ends first resistor R1 is greater than predetermined voltage threshold
Road can generate high level signal (characterization FFU is needed replacing), and high level signal is sent to controller；As first resistor R1 two
When the voltage at end is not more than predetermined voltage threshold, comparison circuit can generate low level signal (no replacement is required by characterization FFU), and will be low
Level signal is sent to controller.Then for controller after receiving high level signal, control alarming device 1, which issues, indicates that FFU is needed
The information warning to be replaced.
As one kind, optionally embodiment, comparison circuit include comparator M, 3rd resistor R3 and the 4th resistance R4；Wherein:
Input terminal of the input anode of comparator M as comparison circuit, the input negative terminal of comparator M respectively with 3rd resistor
The first end of R3 is connected with the first end of the 4th resistance R4, and the second end of 3rd resistor R3 is connect with DC power supply, the 4th resistance
The second end of R4 is grounded, output end of the output end of comparator M as comparison circuit.
Further, the comparison circuit of the application includes comparator M, 3rd resistor R3 and the 4th resistance R4, and work is former
Reason are as follows:
The voltage signal of the input anode input of comparator M are as follows: the voltage at the both ends first resistor R1；The input of comparator M
The voltage signal of negative terminal input are as follows: partial pressure (i.e. fourth of the 3rd resistor R3 and the 4th resistance R4 to the output voltage of DC power supply
The voltage at the both ends resistance R4).When the voltage at the both ends first resistor R1 is greater than the voltage at the 4th both ends resistance R4, comparator M is defeated
High level signal out；Otherwise, comparator M exports low level signal.
It should be noted that comparison circuit is used to compare the voltage and predetermined voltage threshold at the both ends first resistor R1, so
The resistance value of 3rd resistor R3 and the 4th resistance R4 choose the voltage that should meet the 4th both ends resistance R4 equal to predetermined voltage threshold.
Referring to figure 3., Fig. 3 is the tool of the dust circuit for detecting of second of blower fan filtering unit provided in an embodiment of the present invention
Body structural schematic diagram.
As one kind, optionally embodiment, control module 4 include:
The controller being connect with the first end of first resistor R1, for utilizing software program by the electricity at the both ends first resistor R1
Pressure is made comparisons with predetermined voltage threshold, and when voltage is greater than predetermined voltage threshold, control alarming device 1, which issues, indicates that FFU needs
The information warning of replacement.
Specifically, provided by above-described embodiment other than control module 4 (Fig. 2), the first resistor R1 two of the application
The voltage at end and the comparison procedure of predetermined voltage threshold can also be realized by controller by software program, without separately setting ratio
Compared with circuit.
As a kind of optionally embodiment, controller is specially the baseboard management controller carried on mainboard in server
BMC。
Specifically, the controller of the application can select the BMC (Baseboard carried on server master board
Management Controller, baseboard management controller), and utilize GPIO (the General-purpose input/ of BMC
Output, universal input/output) pin connect with external circuit, to receive the voltage signal of external circuit transmission, without
Controller separately is set, has saved cost.
It is also used to as a kind of optionally embodiment, BMC when FFU is needed replacing, the replacement information of FFU is written to clothes
The system log of business device, is checked for staff.
Further, the BMC of the application can also be when determining that FFU is needed replacing, by the replacement information of FFU (as worked as BMC
Determine that voltage, the BMC at the both ends first resistor R1 when FFU is needed replacing determine the time that FFU is needed replacing) it is written to server
System log, to make staff by checking that the replacement information of FFU is recognized in the system log of server.
As a kind of optionally embodiment, alarming device 1 is specially the combined aural and visual alarm being set to outside server.
Specifically, the alarming device 1 of the application can be selected but be not limited only to combined aural and visual alarm (voice signal+light letter
Number), the application is not particularly limited herein, according to the actual situation depending on.
It further include that the dust of any of the above-described kind of blower fan filtering unit is detectd the present invention also provides a kind of server, including FFU
Slowdown monitoring circuit.
The introduction of server provided by the invention please refers to the embodiment of above-mentioned dust circuit for detecting, and the present invention is herein no longer
It repeats.
It should also be noted that, in the present specification, relational terms such as first and second and the like be used merely to by
One entity or operation are distinguished with another entity or operation, without necessarily requiring or implying these entities or operation
Between there are any actual relationship or orders.Moreover, the terms "include", "comprise" or its any other variant meaning
Covering non-exclusive inclusion, so that the process, method, article or equipment for including a series of elements not only includes that
A little elements, but also including other elements that are not explicitly listed, or further include for this process, method, article or
The intrinsic element of equipment.In the absence of more restrictions, the element limited by sentence "including a ...", is not arranged
Except there is also other identical elements in the process, method, article or apparatus that includes the element.
The foregoing description of the disclosed embodiments enables those skilled in the art to implement or use the present invention.
Various modifications to these embodiments will be readily apparent to those skilled in the art, as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, of the invention
It is not intended to be limited to the embodiments shown herein, and is to fit to and the principles and novel features disclosed herein phase one
The widest scope of cause.
Claims (9)
1. a kind of dust circuit for detecting of blower fan filtering unit characterized by comprising
Alarming device；
Set on the first partial pressure electronic component in server on blower fan filtering unit FFU；
In the server, with it is described first partial pressure electronic component it is concatenated second partial pressure electronic component, for
The first partial pressure electronic component cooperation, divides the DC power supply of itself access；
Control module, for detecting the voltage at first partial pressure electronic component both ends, when the voltage is greater than predeterminated voltage
When threshold value, controls the alarming device and issue the information warning for indicating that FFU is needed replacing, referred to for staff.
2. the dust circuit for detecting of blower fan filtering unit as described in claim 1, which is characterized in that the first partial pressure electronics
Component is specially first resistor, and the second partial pressure electronic component is specially second resistance；Wherein:
The first end of the first resistor is connect with the first end of the second resistance, the second end of the second resistance with it is described
DC power supply connection, the second end ground connection of the first resistor.
3. the dust circuit for detecting of blower fan filtering unit as claimed in claim 2, which is characterized in that the control module packet
It includes:
The comparison circuit that input terminal is connect with the first end of the first resistor, for judging the voltage at the first resistor both ends
Whether predetermined voltage threshold is greater than, if so, generating high level signal；If it is not, then generating low level signal；
The controller being connect with the output end of the comparison circuit, for after receiving the high level signal, described in control
Alarming device issues the information warning for indicating that FFU is needed replacing.
4. the dust circuit for detecting of blower fan filtering unit as claimed in claim 3, which is characterized in that the comparison circuit includes
Comparator, 3rd resistor and the 4th resistance；Wherein:
Input terminal of the input anode of the comparator as the comparison circuit, the input negative terminal of the comparator respectively with institute
The first end for stating 3rd resistor is connected with the first end of the 4th resistance, the second end of the 3rd resistor and the direct current
Source connection, the second end ground connection of the 4th resistance, output end of the output end of the comparator as the comparison circuit.
5. the dust circuit for detecting of blower fan filtering unit as claimed in claim 2, which is characterized in that the control module packet
It includes:
The controller being connect with the first end of the first resistor, for utilizing software program by the electricity at the first resistor both ends
Pressure is made comparisons with predetermined voltage threshold, when the voltage is greater than the predetermined voltage threshold, is controlled the alarming device and is issued
Indicate the information warning that FFU is needed replacing.
6. such as the dust circuit for detecting of the described in any item blower fan filtering units of claim 3-5, which is characterized in that the control
Implement body is the baseboard management controller BMC carried on mainboard in the server.
7. the dust circuit for detecting of blower fan filtering unit as claimed in claim 6, which is characterized in that the BMC is also used to work as
When the FFU is needed replacing, the replacement information of the FFU is written to the system log of the server, is looked into for staff
It sees.
8. the dust circuit for detecting of blower fan filtering unit as claimed in claim 6, which is characterized in that the alarming device is specific
For the combined aural and visual alarm outside the server.
9. a kind of server, which is characterized in that further include such as the described in any item blower fan filtering lists of claim 1-8 including FFU
The dust circuit for detecting of member.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910243305.8A CN109992050A (en) | 2019-03-28 | 2019-03-28 | A kind of the dust circuit for detecting and server of blower fan filtering unit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910243305.8A CN109992050A (en) | 2019-03-28 | 2019-03-28 | A kind of the dust circuit for detecting and server of blower fan filtering unit |
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| CN109992050A true CN109992050A (en) | 2019-07-09 |
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| CN201910243305.8A Pending CN109992050A (en) | 2019-03-28 | 2019-03-28 | A kind of the dust circuit for detecting and server of blower fan filtering unit |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110404352A (en) * | 2019-08-29 | 2019-11-05 | 上海境业环保能源科技股份有限公司 | The filter bag of one type oval cross section and its installation application on urea prilling tower |
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Application publication date: 20190709 |