CN203770155U - Control device of impeller front clearance of centrifugal pump - Google Patents
Control device of impeller front clearance of centrifugal pump Download PDFInfo
- Publication number
- CN203770155U CN203770155U CN201420013953.7U CN201420013953U CN203770155U CN 203770155 U CN203770155 U CN 203770155U CN 201420013953 U CN201420013953 U CN 201420013953U CN 203770155 U CN203770155 U CN 203770155U
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- China
- Prior art keywords
- impeller
- pump cover
- front pump
- anterior diastema
- pressure transducer
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Abstract
The utility model discloses a control device of an impeller front clearance of a centrifugal pump. The control device comprises an end cover (4), wherein the end cover (4) is fixedly connected to the outer end of a pump shell (3), an inner hole of the end cover (4) is matched with an outer cylinder of a front pump cover (5) in a sliding way, the end cover (4) is provided with an oil cylinder cavity, the front pump cover (5) is provided with a convex ring (8) along the outer cylinder, the convex ring (8) is matched with the oil cylinder cavity, and a hydraulic oil cylinder is formed by taking the end cover (4) as a cylinder body, taking the convex ring (8) as a piston and taking the front pump cover (5) as a piston rod and is connected with a servo valve (15) of a hydraulic system; the outer side of the front pump cover (5) is connected with a pipeline compensator (7); the inner side end surface of the front pump cover (5) is provided with a first pressure sensor (13) and a second pressure sensor (14) which are used for detecting the pressures at two ends of the impeller front clearance; the first pressure sensor (13) and the second pressure sensor (14) are used as input signals and are connected with an electric control device, the electric control device is used for calculating the impeller front clearance according to the pressures fed back by the pressure sensors and outputting an adjusting control signal for driving the front pump cover (5) to move through the servo valve (15), and the purpose of adjusting the impeller front clearance is achieved.
Description
Technical field
The utility model relates to centrifugal pump field, specifically a kind of centrifugal pump impeller anterior diastema control gear.
Background technique
Known, centrifugal pump is to rely on the centrifugal force producing when vane rotary to carry the pump of liquid, simple and compact structure, and for same quantity delivered, the advantage such as it is little, lightweight that centrifugal pump has area occupied, and material consumption is less, thereby obtained application widely; Centrifugal pump impeller anterior diastema is the main factor that affects efficiency of centrifugal pump, determine the size of centrifugal pump volumetric efficiency, by impeller anterior diastema, liquid after impeller acting can return to pump intake place, the new liq coming with inlet pipe converges and enters in impeller, do work again, thus impeller anterior diastema both affected pump hydraulic efficiency more affect pump volumetric efficiency; When the centrifugal pump of different model unlike material is installed, described gap size has different scopes, and for metal pump, this gap control is in 0.8mm, and nonmetal pump, the impact of expanding with heat and contract with cold during because of machining accuracy and centrifugal pump operation, this gap generally needs 2-3mm; And current centrifugal pump is after manufacture completes, impeller anterior diastema is all nonadjustable, uses after a period of time at centrifugal pump, can be because the factors such as wearing and tearing, distortion cause the change of impeller anterior diastema, and when gap becomes large, leakage is many, and pump efficiency is low; When gap smaller, between impeller and front pump cover, cause friction, cause pump to damage.
Summary of the invention
The purpose of this utility model is to provide a kind of centrifugal pump impeller anterior diastema control gear, and this control gear can be adjusted impeller anterior diastema in real time according to the runnability of centrifugal pump, and impeller anterior diastema is stabilized in operating range.
The utility model solves the technological scheme that its technical problem adopts:
A kind of centrifugal pump impeller anterior diastema control gear, the front pump cover of centrifugal pump is connected with pump case, is provided with impeller in pump case, and impeller is fixedly connected with the main shaft of centrifugal pump, and impeller front end and front pump cover inner side end form impeller anterior diastema;
Pump case outer end is fixedly connected with end cap, and the endoporus of end cap coordinates with the outer cylinder slipper seal of front pump cover, and end cap is also provided with oil cylinder cavity;
Front pump cover is provided with bulge loop along outer cylinder, and bulge loop forms and coordinates with the oil cylinder cavity in end cap, and described oil cylinder cavity is divided into the first oil pocket and the second oil pocket; The front pump cover outer cylinder that is positioned at bulge loop both sides is provided with the first oilhole and the second oilhole that are communicated with the first oil pocket and the second oil pocket respectively;
Be respectively equipped with the first pressure transducer and the second pressure transducer that detect impeller anterior diastema pressure at two ends at the inner side end of the front pump cover of impeller anterior diastema position;
The first oilhole is connected with the servovalve of hydraulic system by connecting tube respectively with the second oilhole; The first pressure transducer is connected with the electric control equipment of setting as input signal with the second pressure transducer, electric control equipment is according to the calculation of pressure impeller anterior diastema of pressure transducer feedback, and output adjusts control signal and adjust the pressure of the first oil pocket and the second oil pocket by servovalve, driving front pump cover moves corresponding distance.
Further, described front pump cover outside is connected with pipeline compensator.
Further, described electric control equipment comprises single-chip microcomputer, and SCM peripheral is connected with D/A modular converter, PID controller and servoamplifier in turn, servoamplifier and servovalve electrical connection; Single-chip microcomputer receives the input signal of the first pressure transducer and the second pressure transducer as processor, and calculates impeller anterior diastema and adjust control signal with output.
Further, described bulge loop and front pump cover are integrated.
In such scheme, PID controller is proportional-integral derivative controller, is widely used for pressure, flow and need to maintains in the industrial processes of expecting on numerical value; Servoamplifier is widely used in high-precision navigation system, and response is fast, and contains the satisfied driving requirement to load of power drive unit; Servovalve receives electric analogue signal, according to the movement of different analogue signal control spools, and to change the flow of hydraulic oil in oil circuit, thus the stroke of piston in control and its connecting fluid compressing cylinder.
The beneficial effects of the utility model are, make end cap form hydraulic jack as piston, front pump cover as piston rod as cylinder body, bulge loop, electric control equipment calculates impeller anterior diastema by pressure feedback, and adopt closed loop control by controlling servovalve to drive front pump cover to move corresponding distance, reach the object of real-time adjustment impeller anterior diastema.
Brief description of the drawings
Below in conjunction with drawings and Examples, the utility model is further illustrated:
Fig. 1 is structural representation of the present utility model;
Fig. 2 is the local enlarged diagram of front pump cover and end cap in the utility model;
Fig. 3 is electrical principle block diagram of the present utility model.
Embodiment
Shown in Fig. 1 and Fig. 2, the front pump cover 5 of centrifugal pump is connected with pump case 3, is provided with impeller 6 in pump case 3, and impeller 6 is fixedly connected with the main shaft 23 of centrifugal pump, and impeller 6 front ends and front pump cover 5 inner side ends form impeller anterior diastema; Pump case 3 outer ends are fixedly connected with end cap 4, and the endoporus of end cap 4 coordinates with the outer cylinder slipper seal of front pump cover 5, and end cap 4 is provided with oil cylinder cavity;
Front pump cover 5 is provided with bulge loop 8 along outer cylinder, and bulge loop 8 forms and coordinates with the oil cylinder cavity of end cap 4, and described oil cylinder cavity is divided into the first oil pocket 11 and the second oil pocket 12; Front pump cover 5 outer cylinder that are positioned at bulge loop 8 both sides are provided with the first oilhole 9 and the second oilhole 10 that are communicated with the first oil pocket 11 and the second oil pocket 12 respectively; The first oilhole 9 is connected with the servovalve 15 of hydraulic system by connecting tube respectively with the second oilhole 10, make end cap 4 as cylinder body, bulge loop 8 as piston, front pump cover 5 as piston rod, form hydraulic jack; Bulge loop 8 can be integrated with front pump cover 5; Front pump cover 5 outsides are also connected with pipeline compensator 7;
Be respectively equipped with the first pressure transducer 13 and the second pressure transducer 14 that detect impeller anterior diastema pressure at two ends at the inner side end of the front pump cover 5 of impeller anterior diastema position; Front pump cover 5 inner side ends are respectively equipped with the first mounting hole 19 and the second mounting hole 20 that the first pressure transducer 13 and the second pressure transducer 14 are installed;
Shown in Fig. 3, the first pressure transducer 13 and the second pressure transducer 14 are inputted single-chip microcomputer 16 by A/D modular converter 21 by pressure signal, single-chip microcomputer 16 converts adjustment signal to analog output by D/A modular converter 22, D/A modular converter 22 connects PID controller 17 and servoamplifier 18 successively, servoamplifier 18 connects servovalve 15, change the flow of hydraulic oil in oil circuit by controlling servovalve 15, drive the movement of front pump cover 5, single-chip microcomputer 16, A/D modular converter 21, D/A modular converter 22, PID controller 17 forms electric control equipment with servoamplifier 18, according to required impeller anterior diastema, the position of front pump cover 5 is adjusted, also can replace single-chip microcomputer 16, A/D modular converter 21, D/A modular converter 22 and PID controller 17 with the PLC that contains PID module,
The outside of front pump cover 5 is also provided with circular groove 24, the first oilholes 9 and is communicated with circular groove 24 respectively with the second oilhole 10, and connecting tube penetrates circular groove 24 and is connected with the second oilhole 10 with the first oilhole 9 respectively; The first mounting hole 19 is communicated with circular groove 24, and the second mounting hole 20 is communicated with circular groove 24 by the auxiliary hole 25 of being located at front pump cover 5, and the electric wire of the first pressure transducer 13 and the second pressure transducer 14 is drawn and is connected to electric control equipment by circular groove 24.
Liquid enters from centrifugal pump entrance 1, and outlet of centrifugal pump 2 flows out, and by impeller anterior diastema δ, the liquid after impeller 6 acting can return to centrifugal pump entrance 1 place, and new liq converges and enter in impeller 6, does work again; The pressure that the first pressure transducer 13 feeds back to single-chip microcomputer 16 is P1, and the pressure that the second pressure transducer 14 feeds back to single-chip microcomputer 16 is P2, therefore the suffered pressure difference of front pump cover 5 inner side ends is △ P=P2-P1; According to without gap leakage formula impeller anterior diastema
, in formula, μ is liquid medium density, l is impeller anterior diastema length, υ
0for impeller front pump cover is in the relative linear velocity of impeller anterior diastema length midpoint; Front pump cover and impeller clearance that generally actual demand is adjusted
δ (s)=(0.8-1.2) δ
*(s), deriving its open loop transfer function through modeling is:
Closed loop transfer function is:
δ in function (s) is the gap between the front pump cover 5 and the impeller 6 that calculate according to feedback pressure P1 and P2, δ
*(s) for leakage rate is the desirable gap width calculating for 1 o'clock, K
afor the gain of servoamplifier 18, K
svfor the proportional gain of servovalve 15, K
qfor the flow gain of servovalve 15, ω
hfor the hydraulic jack natural frequency that front pump cover 5 and end cap 4 form, ξ
hfor the damping ratio of hydraulic jack, K
hfor the feedback factor of pressure transducer; Single-chip microcomputer 16 is adjusted signal according to above-mentioned formula function computing output, ratio, integration and the differential regulation output of process PID controller 17 are to servoamplifier 18, after being amplified, signal exports servovalve 15 to, the dilatation of pipeline compensator 7 compensates connecting tube, make servovalve 15 adjust the pressure of the first oil pocket 11 and the second oil pocket 12, drive front pump cover 5 in the first oil pocket 11 and the second oil pocket 12, to move laterally to desired location according to actual adjusted value, reach the object of adjusting impeller anterior diastema δ, thereby ensured the working efficiency of centrifugal pump.
The above, be only preferred embodiment of the present utility model, not the utility model done to any pro forma restriction; Any those of ordinary skill in the art, do not departing from technical solutions of the utility model scope situation, all can utilize method and the technology contents of above-mentioned announcement to make many possible variations and modification to technical solutions of the utility model, or be revised as the equivalent embodiment of equivalent variations.Therefore; every content that does not depart from technical solutions of the utility model; according to technical spirit of the present utility model to any simple modification made for any of the above embodiments, be equal to replacements, equivalence change and modify, all still belong to technical solutions of the utility model protect scope in.
Claims (4)
1. a centrifugal pump impeller anterior diastema control gear, the front pump cover (5) of centrifugal pump is connected with pump case (3), in pump case (3), be provided with impeller (6), impeller (6) is fixedly connected with the main shaft (23) of centrifugal pump, impeller (6) front end and front pump cover (5) inner side end form impeller anterior diastema, it is characterized in that:
A. pump case (3) outer end is fixedly connected with end cap (4), and the endoporus of end cap (4) coordinates with the outer cylinder slipper seal of front pump cover (5), and end cap (4) is also provided with oil cylinder cavity;
B. front pump cover (5) is provided with bulge loop (8) along outer cylinder, bulge loop (8) forms and coordinates with the oil cylinder cavity in end cap (4), and described oil cylinder cavity is divided into the first oil pocket (11) and the second oil pocket (12); Front pump cover (5) outer cylinder that is positioned at bulge loop (8) both sides is provided with the first oilhole (9) and the second oilhole (10) that are communicated with the first oil pocket (11) and the second oil pocket (12) respectively;
C. be respectively equipped with at the inner side end of the front pump cover (5) of impeller anterior diastema position the first pressure transducer (13) and the second pressure transducer (14) that detect impeller anterior diastema pressure at two ends;
D. the first oilhole (9) is connected with the servovalve (15) of hydraulic system by connecting tube respectively with the second oilhole (10), the first pressure transducer (13) is connected with the electric control equipment of setting as input signal with the second pressure transducer (14), electric control equipment is according to the calculation of pressure impeller anterior diastema of pressure transducer feedback, and output adjustment control signal is by the pressure of servovalve (15) adjustment the first oil pocket (11) and the second oil pocket (12), drives front pump cover (5) to move corresponding distance.
2. a kind of centrifugal pump impeller anterior diastema control gear according to claim 1, is characterized in that: described front pump cover (5) outside is connected with pipeline compensator (7).
3. a kind of centrifugal pump impeller anterior diastema control gear according to claim 1 and 2, it is characterized in that: described electric control equipment comprises single-chip microcomputer (16), single-chip microcomputer (16) periphery is connected with D/A modular converter (22), PID controller (17) and servoamplifier (18) in turn, servoamplifier (18) and servovalve (15) electrical connection; Single-chip microcomputer (16) receives the input signal of the first pressure transducer (13) and the second pressure transducer (14) as processor, and calculates impeller anterior diastema and adjust control signal with output.
4. a kind of centrifugal pump impeller anterior diastema control gear according to claim 1 and 2, is characterized in that: described bulge loop (8) is integrated with front pump cover (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420013953.7U CN203770155U (en) | 2014-01-10 | 2014-01-10 | Control device of impeller front clearance of centrifugal pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420013953.7U CN203770155U (en) | 2014-01-10 | 2014-01-10 | Control device of impeller front clearance of centrifugal pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203770155U true CN203770155U (en) | 2014-08-13 |
Family
ID=51287352
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420013953.7U Expired - Fee Related CN203770155U (en) | 2014-01-10 | 2014-01-10 | Control device of impeller front clearance of centrifugal pump |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203770155U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103742424A (en) * | 2014-01-10 | 2014-04-23 | 安徽工程大学 | Impeller front clearance control device for centrifugal pump |
| CN112032062A (en) * | 2020-08-22 | 2020-12-04 | 安徽江南泵阀集团有限公司 | Mortar pump with self-compensating impeller clearance |
| CN112555168A (en) * | 2020-12-17 | 2021-03-26 | 南水北调东线山东干线有限责任公司 | Vertical full-adjustable axial flow pump impeller pump body clearance detection device |
-
2014
- 2014-01-10 CN CN201420013953.7U patent/CN203770155U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103742424A (en) * | 2014-01-10 | 2014-04-23 | 安徽工程大学 | Impeller front clearance control device for centrifugal pump |
| CN103742424B (en) * | 2014-01-10 | 2015-08-19 | 安徽工程大学 | A kind of impeller front clearance control device for centrifugal pump |
| CN112032062A (en) * | 2020-08-22 | 2020-12-04 | 安徽江南泵阀集团有限公司 | Mortar pump with self-compensating impeller clearance |
| CN112555168A (en) * | 2020-12-17 | 2021-03-26 | 南水北调东线山东干线有限责任公司 | Vertical full-adjustable axial flow pump impeller pump body clearance detection device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140813 Termination date: 20160110 |