CN102207111A - Composite flow valve - Google Patents
Composite flow valve Download PDFInfo
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- CN102207111A CN102207111A CN201110145809XA CN201110145809A CN102207111A CN 102207111 A CN102207111 A CN 102207111A CN 201110145809X A CN201110145809X A CN 201110145809XA CN 201110145809 A CN201110145809 A CN 201110145809A CN 102207111 A CN102207111 A CN 102207111A
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Abstract
The invention relates to a composite flow valve. In the technical scheme, a valve sleeve [8] is fixedly arranged in a valve body [9]; a valve core [1] is concentrically and movably arranged in the valve sleeve [8]; 4 to 8 square grooves are uniformly distributed on the right side edge of a cylindrical surface of a left shoulder [4], on the left side edge of a cylindrical surface of a middle shoulder [12], on the right side edge of the cylindrical surface of the middle shoulder [12] and on the left side edge of a cylindrical surface of a right shoulder [16] respectively; and at the installation position of the valve core [1], the right side face of each left shoulder square groove [7] and the left side face of the corresponding left window [6] are positioned on the same straight line, the left side face of each right shoulder square groove [17] and the right side face of the corresponding right window [21] are positioned on the same straight line, the installation position of each middle shoulder left square groove [26] corresponds to that of each right shoulder square groove [17], and the installation position of each middle shoulder right square groove [13] corresponds to that of a left shoulder square groove [7]. The composite flow valve has the characteristics of high frequency response, reliability and flow rate, small volume, low leakage rate and general applicability.
Description
Technical field
The invention belongs to the servo valve technology field, relate in particular to a kind of combined type Flow valve.
Background technique
The development trend of high-frequency electrohydraulic servo-system is towards the development of the above response frequency of 1000Hz, to adapt to the demand of aspects such as vibration environment test in the new product development process, fatigue test of materials.The height of electrohydraulic servo system frequency of okperation depends primarily on the height of servovalve response frequency.
At present, Xian Jin high frequency servo valve adopts nozzle-baffle type and two kinds of structures of jet tubular type more.The characteristics of nozzle-baffle type be simple in structure, volume is little, movement inertia is little, needed driving force is little, does not have friction, and is highly sensitive; But its meta leakage rate is big, and output flow is little; The aperture and the gap between the nozzle flapper of fixed orifice are little, easily stop up, and contamination resistance is poor; Be applicable to small-signal operation, be commonly used for the preamplifier stage of two-stage servovalve.The jet pipe aperture of jet tubular type and the gap between jet pipe nozzle and the receiver hand over nozzle baffle type big, and anti-soil allows and resists the ability of stopping up to strengthen to some extent; Jet nozzle has inefficacy centering function, efficiency of amplitude height; But complex structure, processing and debugging difficulty, movement parts inertia are big, and the pressure inlet tube rigidity of jet pipe is poor, easily vibration, performance is difficult to be held, and is commonly used for the preamplifier stage of two-stage servovalve.
At present, big flow servovalve multistage servovalve and the direct-acting type servovalves of forming by pilot valve and power valve that adopt more.Though multistage servovalve flow is big, the inertia and the compressibility of the inertia of pilot valve internals and control fluid thereof make the frequency response of power valve step valve greatly reduce, and contamination resistance use weak, leakage rate ambassador's servovalve is restricted.Direct-acting type servovalve function admirable, contamination resistance is stronger, and leakage rate is little, but the volume mass of the big flow servovalve of common valve body structure is bigger, needs more powerful torque motor.
At present, disclosed 2D high-frequency digital selector valve technology (Xu Zibin, Li Sheng, Ruan Jian .2D high-frequency digital selector valve [J]. hydraulic pressure and pneumatic, 2008 (9): 79-81), this numeral selector valve has groove on spool, by two driven by servomotor spools, make the spool axial motion respectively and rotatablely move, make the area generating period variation that window constitutes on groove and the valve pocket, can effectively improve commutating frequency, thereby improve the excited frequency of excitation system.But the orifice size of this valve is made of window on groove and the valve pocket, mainly changes the input output direction by rotatablely moving, and output waveform is limited in the course of the work, and the flow on single direction can not be continuous, makes application area be restricted.
Summary of the invention
The present invention is intended to overcome above-mentioned technological deficiency, and purpose provides a kind of frequency response height, reliability height, flow is big, volume is little, leakage rate is little and blanket combined type Flow valve.
To achieve these goals, the technical solution used in the present invention is: this valve body comprises spool, left end cap, left sealing gasket, valve pocket, valve body, right sealing gasket and right end cap.The valve body internal fixation is equipped with valve pocket, and the left end of valve body is equipped with left end cap, and left sealing gasket is housed between the left end of valve body and left end cap, and the right-hand member of valve body is equipped with right end cap, and right sealing gasket is housed between the right-hand member of valve body and right end cap; The two ends of spool are passed left end cap and right end cap activity concentrically respectively and are packed in the valve pocket.
On valve body, be provided with left circular groove, intermediate annular groove and right circular groove equably; Be provided with 4～8 plain lines on the valve pocket equably, every plain line on the valve pocket is respectively equipped with left window, middle window and right window, and each left window, middle window and right window are corresponding with left circular groove, intermediate annular groove and right circular groove respectively; Be provided with left fuel feeding window, right fuel feeding window, left throttle orifice window and right throttle orifice window at valve pocket, left fuel feeding window is between left window and middle window, and right fuel feeding window is between middle window and right window; Left side throttle orifice window is positioned at the left side of left window, and right throttle orifice window is positioned at the right side of right window.
The axle of spool is provided with left shoulder, middle shoulder and right shoulder, left shoulder, middle shoulder and right shoulder respectively with the inwall of valve pocket for movingly.The left side right flank of shoulder and the right flank of left window are positioned on the plane, and two sides of middle shoulder and two sides of middle window lay respectively on two planes, and the left surface of right shoulder and the left surface of right window are positioned on the plane.The right side edge place of shoulder cylndrical surface, a left side is distributed with 4～8 left shoulder square grooves equably, the left side edge place of middle shoulder cylndrical surface is distributed with 4～8 middle shoulder left side square grooves equably, the right side edge place of middle shoulder cylndrical surface is distributed with 4～8 right square grooves of middle shoulder equably, and the left side edge place of right shoulder cylndrical surface is distributed with 4～8 right shoulder square grooves equably.
Installed position at spool, the left surface of the left window of the right flank of each left shoulder square groove and correspondence is straight line altogether, the right flank of the right window of the left surface of each right shoulder square groove and correspondence is straight line altogether, the mounting point of shoulder left side square groove is with corresponding right shoulder square groove in each, and the mounting point of the right square groove of shoulder is with corresponding left shoulder square groove in each.
Have return opening, left oil-feed port, filler opening and right oil-feed port on valve body, return opening, left oil-feed port, filler opening and right oil-feed port communicate with each self-corresponding left circular groove, left fuel feeding window, intermediate annular groove and right fuel feeding window respectively.
Have left elongated throttle orifice on the valve body left side, an end of left elongated throttle orifice communicates with left throttle orifice window, and the other end communicates with return opening; Have oil through at valve inner, an end and the right circular groove of oil through communicate, and the other end and return opening communicate; Have right elongated throttle orifice on the right of valve body, an end of right elongated throttle orifice and right throttle orifice window communicate, and the other end and oil through communicate.
The window of described left window, middle window and right window is square, and the length of side of left window and right window equates, the length of side of left window is 0.6～1.0 times of the length of side of middle window.
Described intermediate annular groove wide is the wide 1.0～1.6 times of left circular groove, and the wide of left circular groove and right circular groove equate, left circular groove wide is 0.6～0.8 times of valve block internal diameter.
The equal diameters of described left shoulder, middle shoulder and right shoulder, left shoulder equate with the wide of right shoulder, and right shoulder wide is 0.6～0.8 times of right shoulder diameter, and middle shoulder wide is 0.6～0.7 times of middle shoulder diameter.
Owing to adopt such scheme, valve port area of passage of the present invention is made of two-part, first portion is that edge and its corresponding respectively left window, right window and middle window of left shoulder, right shoulder and middle shoulder constitutes, and second portion is made of left shoulder square groove, right shoulder square groove, middle shoulder left side square groove and the right square groove of middle shoulder and its corresponding respectively left window, right window and middle window.Spool not only reciprocal axial motion changes the valve port area of passage, and the reciprocally swinging of spool can realize that the valve port area of passage that the spool square groove matches with the valve pocket window changes, the valve port area of passage is two-part valve port area sum, so can improve the flow of Flow valve, and the flow of Flow valve on single direction is continuous, the general characteristic that possesses servovalve makes this Flow valve can be used in servovalve.This Flow valve can be by two-part common control flow rate of moving, and because spool is that the slim-lined construction rotary inertia is little, be in again in the good lubricating status of hydraulic oil, the rotation response frequency is higher, thereby can improve the frequency response of the servovalve of forming with this Flow valve.Because Flow valve can move, can prevent effectively that spool from can not work servovalve at folk prescription to producing fault, increased the reliability of the servovalve of forming with this Flow valve on both direction.
Because area of passage is big with respect to the ordinary straight movable valve plug, so under the identical situation of flow, volume mass is less.Since adopt the direct-acting type valve body structure, simple in structure, easy for installation, and also it is strong to have kept ordinary straight dynamic formula valve body contamination resistance, the advantage that vent flow is little.
Therefore, the present invention has frequency response height, reliability height, and flow is big, volume is little, leakage rate is little and blanket characteristics.
Description of drawings
Fig. 1 is a kind of structural representation of the present invention;
Fig. 2 for the K-K of Fig. 1 to looking schematic representation;
Fig. 3 for the H-H of Fig. 1 to looking schematic representation.
Embodiment
The present invention will be further described below in conjunction with the drawings and specific embodiments, is not the restriction to its protection domain.
A kind of combined type Flow valve.Its structure is as shown in Figure 1: this valve body comprises spool 1, left end cap 2, left sealing gasket 3, valve pocket 8, valve body 9, right sealing gasket 14 and right end cap 15.Valve body 9 internal fixation are equipped with valve pocket 8, and the left end of valve body 9 is equipped with left end cap 2, and 2 of valve body 9 left ends and left end caps are equipped with left sealing gasket 3, and the right-hand member of valve body 9 is equipped with right end cap 15, and 2 of valve body 9 right-hand members and right end caps are equipped with right sealing gasket 14; The two ends of spool 1 are passed left end cap 2 and right end cap 15 concentric activities respectively and are packed in the valve pocket 8.
On valve body 9, be provided with left circular groove 5, intermediate annular groove 10 and right circular groove 20 equably, be provided with 4 plain lines on the valve pocket 8 equably, every plain line on the valve pocket 8 is respectively equipped with left window 6, middle window 11 and right window 21, and each left window 6, middle window 11 and right window 21 are corresponding with left circular groove 5, intermediate annular groove 10 and right circular groove 20 respectively; Be provided with left fuel feeding window 28, right fuel feeding window 24, left throttle orifice window 31 and right throttle orifice window 18 at valve pocket 8, left fuel feeding window 28 is between left window 6 and middle window 11, and right fuel feeding window 24 is between middle window 11 and right window 21; Left side throttle orifice window 31 is positioned at the left side of left window 6, and right throttle orifice window 18 is positioned at the right side of right window 21.
As shown in Figures 2 and 3, the axle of spool 1 is provided with left shoulder 4, middle shoulder 12 and right shoulder 16, left shoulder 4, middle shoulder 12 and right shoulder 16 respectively with the inwall of valve pocket 8 for movingly; The left side right flank of shoulder 4 and the right flank of left window 6 are positioned on the plane, and two sides of middle shoulder 12 and two sides of middle window 11 lay respectively on two planes, and the left surface of the left surface of right shoulder 16 and right window 21 is positioned on the plane; The right side edge place of shoulder 4 cylndrical surface, a left side is distributed with 4～8 left shoulder square grooves 7 equably, the left side edge place of middle shoulder 12 cylndrical surface is distributed with 4 middle shoulder left side square grooves 26 equably, the right side edge place of middle shoulder 12 cylndrical surface is distributed with 4 right square grooves 13 of middle shoulder equably, and the left side edge place of right shoulder 16 cylndrical surface is distributed with 4 right shoulder square grooves 17 equably.
Installed position at spool 1: as shown in Figure 2, the left surface of the left window 6 of the right flank of each left shoulder square groove 7 and correspondence is straight line altogether, the right flank of the right window 21 of the left surface of each right shoulder square groove 17 and correspondence is straight line altogether, the mounting point of shoulder left side square groove 26 is with corresponding right shoulder square groove 17 in each, and the mounting point of the right square groove 13 of shoulder is with corresponding left shoulder square groove 7 in each.
Have return opening 29, left oil-feed port 27, filler opening 25 and right oil-feed port 23 on valve body 9, return opening 29, left oil-feed port 27, filler opening 25 and right oil-feed port 23 communicate with each self-corresponding left circular groove 5, left fuel feeding window 28, intermediate annular groove 10 and right fuel feeding window 24 respectively.
Have left elongated throttle orifice 30 on valve body 9 left sides, an end of left elongated throttle orifice 30 communicates with left throttle orifice window 31, and the other end communicates with return opening 29; Have oil through 22 in valve body 9 inside, an end and the right circular groove 20 of oil through 22 communicate, and the other end and return opening 29 communicate; Have right elongated throttle orifice 19 on the right of valve body 9, an end of right elongated throttle orifice 19 and right throttle orifice window 18 communicate, and the other end and oil through 22 communicate.
In the present embodiment: the window of left window 6, middle window 11 and right window 21 is square, and the length of side of left window 6 and right window 21 equates, the length of side of left window 6 is 0.6～0.7 times of the length of side of middle window 11; Intermediate annular groove 10 wide is 1.0～1.2 times of left circular groove 5, and the wide of left circular groove 5 and right circular groove 20 equate, left circular groove 5 wide is 0.6～0.7 times of valve body 9 internal diameters; The equal diameters of left side shoulder 4, middle shoulder 12 and right shoulder 16, left shoulder 4 equate with the wide of right shoulder 16, and right shoulder 16 wide is 0.6～0.7 times of right shoulder 16 diameters, and middle shoulder 12 wide is 0.6～0..65 times of middle shoulder 12 diameters.
A kind of combined type Flow valve.Its structure is as shown in Figure 1: except that following technical parameter, all the other are with embodiment 1.
On valve body 9, be provided with left circular groove 5, intermediate annular groove 10 and right circular groove 20 equably, be provided with 5～8 plain lines on the valve pocket 8 equably, every plain line on the valve pocket 8 is respectively equipped with left window 6, middle window 11 and right window 21, and each left window 6, middle window 11 and right window 21 are corresponding with left circular groove 5, intermediate annular groove 10 and right circular groove 20 respectively.
The right side edge place of shoulder 4 cylndrical surface, a left side is distributed with 5～8 left shoulder square grooves 7 equably, the left side edge place of middle shoulder 12 cylndrical surface is distributed with 5～8 middle shoulder left side square grooves 26 equably, the right side edge place of middle shoulder 12 cylndrical surface is distributed with 5～8 right square grooves 13 of middle shoulder equably, and the left side edge place of right shoulder 16 cylndrical surface is distributed with 5～8 right shoulder square grooves 17 equably.
The length of side of left window 6 is 0.7～1.0 times of the length of side of middle window 11; Intermediate annular groove 10 wide is 1.2～1.6 times of left circular groove 5, and the wide of left circular groove 5 and right circular groove 20 equate, left circular groove 5 wide is 0.7～0.8 times of valve body 9 internal diameters; The equal diameters of left side shoulder 4, middle shoulder 12 and right shoulder 16, left shoulder 4 equate with the wide of right shoulder 16, and right shoulder 16 wide is 0.7～0.8 times of right shoulder 16 diameters, and middle shoulder 12 wide is 0.65～0.7 times of middle shoulder 12 diameters.
The valve port area of passage of this embodiment is made of two-part, first portion is that edge and its corresponding respectively left window 6, right window 21 and the middle window 11 of left shoulder 4, right shoulder 16 and middle shoulder 12 constitutes, and second portion is made of left shoulder square groove 7, right shoulder square groove 17, middle shoulder left side square groove 26 and the right square groove 13 of middle shoulder and its corresponding respectively left window 6, right window 21 and middle window 11.Spool 1 not only reciprocal axial motion changes the valve port area of passage, and the reciprocally swinging of spool 1 can realize that the square groove of spool 1 changes with the valve port area of passage that the window of valve pocket 8 matches, the valve port area of passage is two-part valve port area sum, so can improve the flow of Flow valve, and the flow of Flow valve on single direction is continuous, the general characteristic that possesses servovalve makes this Flow valve can be used in servovalve.This Flow valve can be by two-part common control flow rate of moving, and because spool is that the slim-lined construction rotary inertia is little, be in again in the good lubricating status of hydraulic oil, the rotation response frequency is higher, thereby can improve the frequency response of the servovalve of forming with this Flow valve.Because Flow valve can move, can prevent effectively that spool from can not work servovalve at folk prescription to producing fault, increased the reliability of the servovalve of forming with this Flow valve on both direction.
Because area of passage is big with respect to ordinary straight dynamic formula spool, and is less in flow same case lower volume quality.Since adopt direct-acting type valve body simple in structure, easy for installation, and it is strong to have kept ordinary straight dynamic formula valve body contamination resistance, the advantage that vent flow is little.So this embodiment has frequency response height, reliability height, flow is big, volume is little, leakage rate is little and suitable wide characteristics.
Claims (4)
1. a combined type Flow valve is characterized in that this Flow valve comprises spool [1], left end cap [2], left sealing gasket [3], valve pocket [8], valve body [9], right sealing gasket [14] and right end cap [15]; Valve body [9] internal fixation is equipped with valve pocket [8], the left end of valve body [9] is equipped with left end cap [2], between the left end of valve body [9] and left end cap [2] left sealing gasket [3] is housed, the right-hand member of valve body [9] is equipped with right end cap [15], between the right-hand member of valve body [9] and right end cap [2] right sealing gasket [14] is housed; The two ends of spool [1] are passed left end cap [2] and right end cap [15] activity concentrically respectively and are packed in the valve pocket [8];
On valve body [9], be provided with left circular groove [5], intermediate annular groove [10] and right circular groove [20] equably, be provided with 4～8 plain lines on the valve pocket [8] equably, every plain line on the valve pocket [8] is respectively equipped with left window [6], middle window [11] and right window [21], and each left window [6], middle window [11] and right window [21] are corresponding with left circular groove [5], intermediate annular groove [10] and right circular groove [20] respectively; Be provided with left fuel feeding window [28], right fuel feeding window [24], left throttle orifice window [31] and right throttle orifice window [18] at valve pocket [8], left side fuel feeding window [28] is positioned between left window [6] and the middle window [11], and right fuel feeding window [24] is positioned between middle window [11] and the right window [21]; Left side throttle orifice window [31] is positioned at the left side of left window [6], and right throttle orifice window [18] is positioned at the right side of right window [21];
The axle of spool [1] is provided with left shoulder [4], middle shoulder [12] and right shoulder [16], left shoulder [4], middle shoulder [12] and right shoulder [16] respectively with the inwall of valve pocket [8] for movingly; The right flank of left side shoulder [4] and the right flank of left window [6] are positioned on the plane, the left surface of middle shoulder [12] and the left surface of middle window [11] are positioned on the plane, the right flank of middle shoulder [12] and the right flank of middle window [11] are positioned on the plane, and the left surface of the left surface of right shoulder [16] and right window [21] is positioned on the plane; The right side edge place of shoulder [4] cylndrical surface, a left side is distributed with 4～8 left shoulder square grooves [7] equably, the left side edge place of middle shoulder [12] cylndrical surface is distributed with 4～8 middle shoulder left side square grooves [26] equably, the right side edge place of middle shoulder [12] cylndrical surface is distributed with 4～8 right square grooves [13] of middle shoulder equably, and the left side edge place of right shoulder [16] cylndrical surface is distributed with 4～8 right shoulder square grooves [17] equably;
Installed position in spool [1], the left surface of the left window [6] of the right flank of each left shoulder square groove [7] and correspondence is straight line altogether, the right flank of the right window [21] of the left surface of each right shoulder square groove [17] and correspondence is straight line altogether, the mounting point of shoulder left side square groove [26] is with corresponding right shoulder square groove [17] in each, and the mounting point of the right square groove of shoulder [13] is with corresponding left shoulder square groove [7] in each;
Have return opening [29], left oil-feed port [27], filler opening [25] and right oil-feed port [23] on valve body [9], return opening [29], left oil-feed port [27], filler opening [25] and right oil-feed port [23] communicate with each self-corresponding left circular groove [5], left fuel feeding window [28], intermediate annular groove [10] and right fuel feeding window [24] respectively;
Have left elongated throttle orifice [30] on valve body [9] left side, an end of left elongated throttle orifice [30] communicates with left throttle orifice window [31], and the other end communicates with return opening [29]; Have oil through [22] in valve body [9] inside, an end of oil through [22] and right circular groove [20] communicate, and the other end and return opening [29] communicate; Have right elongated throttle orifice [19] on the right of valve body [9], an end of right elongated throttle orifice [19] and right throttle orifice window [18] communicate, and the other end and oil through [22] communicate.
2. combined type Flow valve according to claim 1, the window that it is characterized in that described left window [6], middle window [11] and right window [21] is square, the length of side of left window [6] and right window [21] equates, the length of side of left window [6] is 0.6～1.0 times of the length of side of middle window [11].
3. combined type Flow valve according to claim 1, wide wide 1.0～1.6 times for left circular groove [5] that it is characterized in that described intermediate annular groove [10], a left side circular groove [5] and right circular groove [20] wide equal, left circular groove [5] wide are 0.6～0.8 times of valve body [9] internal diameter.
4. combined type Flow valve according to claim 1, the equal diameters that it is characterized in that described left shoulder [4], middle shoulder [12] and right shoulder [16], the left side shoulder [4] and wide the equating of right shoulder [16], right shoulder [16] wide is 0.6～0.8 times of right shoulder [16] diameter, and middle shoulder [12] wide is 0.6～0.7 times of middle shoulder [12] diameter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110145809 CN102207111B (en) | 2011-06-01 | 2011-06-01 | Composite flow valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110145809 CN102207111B (en) | 2011-06-01 | 2011-06-01 | Composite flow valve |
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| CN102207111A true CN102207111A (en) | 2011-10-05 |
| CN102207111B CN102207111B (en) | 2013-06-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201110145809 Expired - Fee Related CN102207111B (en) | 2011-06-01 | 2011-06-01 | Composite flow valve |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108518372A (en) * | 2018-06-07 | 2018-09-11 | 武汉科技大学 | A kind of combination valve of flow automatic regulation |
| CN109519429A (en) * | 2018-11-16 | 2019-03-26 | 中国航发西安动力控制科技有限公司 | Change-over valve core |
| CN110296118A (en) * | 2019-08-05 | 2019-10-01 | 安徽理工大学 | A kind of automatic switching structure applied to double freedom rotary valve spool |
| CN110908409A (en) * | 2019-12-09 | 2020-03-24 | 深圳市奥兰特机械有限公司 | Method for quickly keeping constant flow of new energy tester |
| CN114719172A (en) * | 2022-04-27 | 2022-07-08 | 海南航发科技有限公司 | Intelligent control device used based on bearing lubrication and control method thereof |
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| CN101963166A (en) * | 2010-10-22 | 2011-02-02 | 浙江工业大学 | Dual-mode electric digital valve |
| CN201836154U (en) * | 2010-06-10 | 2011-05-18 | 浙江工业大学 | High-frequency electrohydraulic fluttering generator |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108518372A (en) * | 2018-06-07 | 2018-09-11 | 武汉科技大学 | A kind of combination valve of flow automatic regulation |
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| CN110296118A (en) * | 2019-08-05 | 2019-10-01 | 安徽理工大学 | A kind of automatic switching structure applied to double freedom rotary valve spool |
| CN110296118B (en) * | 2019-08-05 | 2024-04-02 | 安徽理工大学 | Be applied to automatic switch-over structure of two degrees of freedom rotary valve case |
| CN110908409A (en) * | 2019-12-09 | 2020-03-24 | 深圳市奥兰特机械有限公司 | Method for quickly keeping constant flow of new energy tester |
| CN110908409B (en) * | 2019-12-09 | 2022-08-05 | 深圳市奥兰特机械有限公司 | Method for quickly keeping constant flow of new energy tester |
| CN114719172A (en) * | 2022-04-27 | 2022-07-08 | 海南航发科技有限公司 | Intelligent control device used based on bearing lubrication and control method thereof |
| CN114719172B (en) * | 2022-04-27 | 2023-10-03 | 海南航发科技有限公司 | Intelligent control device based on bearing lubrication and control method thereof |
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