CN1015021B - Contant-flow adjustment system and method for volume-type hydraulic pump with electric leakage compensation - Google Patents
Contant-flow adjustment system and method for volume-type hydraulic pump with electric leakage compensationInfo
- Publication number
- CN1015021B CN1015021B CN 88100117 CN88100117A CN1015021B CN 1015021 B CN1015021 B CN 1015021B CN 88100117 CN88100117 CN 88100117 CN 88100117 A CN88100117 A CN 88100117A CN 1015021 B CN1015021 B CN 1015021B
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- China
- Prior art keywords
- pump
- flow
- leakage
- hydraulic pump
- constant
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- Expired
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- Control Of Positive-Displacement Pumps (AREA)
Abstract
The present invention relates to a constant flow regulation system and method for a volume type hydraulic pump with the function of electric compensation for leakage, which belongs to the technical field of the constant flow quantity regulation of the hydraulic pump. The present invention does not directly detects the output flow quantity of the pump, but achieves the purpose of obtaining constant output flow quality of the pump by detecting the parameters, such as the variable of the pump, the displacement of an oil cylinder, the flow quantity of external leakage, temperature, pressure, etc., identifying the leakage flow quantity of the pump by processing signals, and compensating electricity to the given signals in real time. The present invention can be used for regulating the constant flow quantity of various volume type variable pumps, and completely avoids the energy loss caused by the installation of flow quantity detecting elements in traditional constant flow quantity regulating pumps.
Description
The invention belongs to Hydraulic Pump Constant Flow amount regulation technology.
Flow is a basic parameter in the fluid dynamic control.Whether the Flow-rate adjustment of volume-type hydraulic pump is subjected to the influence of other disturbing factors such as load according to the flow of logistics, divide into that permanent discharge capacity is regulated and constant current amount adjusting two big classes.With the adjusting oil cylinder displacement of displacement transducer impression reflection oil pump capacity, and feeding back to the electric feedback regulation closed loop that servovalve or Proportional valve constituted of controlled variable outlet, is a kind of permanent discharge capacity control, and it can not get rid of the influence of other disturbing factors such as load.It is that the flow that makes pump export to system is not subjected to the influence of other disturbing factors such as load and remains setting value that the constant current amount of volume-type hydraulic pump is regulated.The constant current amount is regulated pump and is called power again and adapts to pump, because of its output flow and pressure are that power all adapts with bearing power, can make system reach higher efficient and is widely used.Up to now, the constant current amount is regulated pump one flow sensor is set on working connection usually both at home and abroad, to realize the flow detection feedback control.Two kinds of forms are generally arranged, and a kind of is that a flow controller is set in the working connection of oil hydraulic pump, is pressure reduction with the output flow signal conversion, and realizes flow pressure reduction feedback, and pump delivery is compensated adjusting, reaches the output of constant current amount.Another kind is the output flow that a flow transducer testing pump is set in the working connection of oil hydraulic pump, and the flux signal that flow transducer detects gained is converted into displacement, power or voltage signal, again relatively, realize the flow feedback regulation and realize that the constant current amount of pump regulates itself and given signal.But, though regulating, pressure differential detection feedback-type constant current amount can obtain a less regulating error (＜10%) and comparatively satisfied regulation range, but the pressure loss at flow controller place is at least 1.0～1.4MPa as feedback signal, although and the constant current amount that adopts flow transducer is regulated flow transducer under corresponding conditions, its operating pressure differential is compared with above-mentioned flow controller as the flow-pressure differential transducer, only need 1/3～1/2, but still need 0.5～0.7MPa.No matter this shows, be the regulating method of which kind of constant flow pump, because of directly detect load flow on working connection, brought additional full flow throttling power loss.When working under rated pressure for the high-pressure service pump of 31.5MPa, about wasted power 2～4% is when working under rated pressure for the medium pressure pump of 16.0MPa, about wasted power 3～9%, when moving under the low pressure operating mode, operational efficiency is lower, and this is undoubtedly a kind of energy loss.
Regulate the drawback that there is the secondary power loss in pump in order to overcome above-mentioned existing constant current amount, develop a kind of employing and leak electronic compensating volume-type hydraulic pump constant flow regulation system and method, special proposition the present invention.
The invention reside in when avoiding the Hydraulic Pump Constant Flow amount to regulate fully, because of the energy loss that flow detecting element causes is set on working connection.Consider that it is the leakage flow that ambient conditions such as compensating load causes that the Hydraulic Pump Constant Flow amount is regulated, and leakage flow when working medium is selected, is the function of working pressure and oil temperature to given pump.Therefore, the constant flow pump characteristic can by measuring pressure fuel pump, oil temperature, be carried out real-time electronic compensating by known penality function to input signal and realize on the basis of electric feedback constant displacement pump.In addition, also can become to determine to concern this characteristics with the leakage quantity that leaks, by only detecting the external leakage flow, handle the leakage flow that picks out pump, and input signal is carried out real-Time Compensation, thereby obtain the constant current flow characteristic through the electric signal ratio according to the total leakage rate of oil pump.
Effect of the present invention is: it can realize the constant flow regulation of pump to various positive displacement variable displacement pumps, and has avoided existing constant current amount to regulate pump because of the energy loss that flow detecting element causes is set fully.
Description of drawings:
Fig. 1, leakage electronic compensating volume-type hydraulic pump constant flow regulation system diagram;
Fig. 2, leakage electronic compensating volume-type hydraulic pump constant flow regulation structural drawing.
Among the figure: 1-threeway servovalve, the 2-proportional amplifier, the 3-displacement transducer, 4-regulates oil cylinder, 5-pump body, 6-external leakage flow transducer, 7-compensating circuit, 8-oil temperature sensor, 9-pressure transducer.
The invention will be further described below in conjunction with accompanying drawing: as Fig. 1, shown in Figure 2, leakage electronic compensating volume-type hydraulic pump constant flow regulation of the present invention system, it comprises by threeway servovalve 1, proportional amplifier 2, the displacement transducer 3 of reflection oil pump capacity, regulate oil cylinder 4, on the basis of the electric feedback constant displacement pump that pump body 5 is formed, at the outlet port of pump body 5 amount of the establishing oil temperature sensor 8 of packing into, pressure transducer 9, oil temperature sensor 8, the other end of pressure transducer 9 is connected with compensating circuit 7 or the low differential pressure external leakage flow transducer 6 of connecting between leak fistulae and the compensating circuit 7 of pump body 5, and through compensating circuit with input signal u
iCarry out transformation of scale, carry out compensation, reach the constant flow pump characteristic.Oil temperature sensor 8 and pressure transducer 9 can be selected the corresponding product of selling on the market for use, and low differential pressure external leakage flow transducer 6 can adopt the little flow fax sense patterns such as turbine flowmeter of the pressure loss.
But for given pump and its leakage rate approximate expression of working medium:
∑q＝q
i+q
out K
p·
+K
T（T-T
50°）……（1）
∑q＝（l+K
oi）……（2）
In the formula: q
i-internal leakage flow
q
Out-external leakage flow
K
p-leak pressure constant can be obtained by actual measurement
K
T-leaking thermal constant, can obtain by actual measurement
K
Oi-internal and outernal leakage proportionality constant depends on the kind and the size of pump
T
50 °-50 ℃, the standard state temperature
The pressure flow compensation also can be adopted linear approximation, that is:
∑q
K
pP+K
T（T-T
50°）……（3）
In fact compensating circuit can adopt the compensation potentiometer to realize, and adjusts the operation point according to length working time of actual measurement or pump, very convenient linearity or the nonlinear compensation that realizes leakage rate relative pressure and oil temperature.
Claims (4)
1, a kind of leakage electronic compensating volume-type hydraulic pump constant flow regulation system, it comprises the electric feedback constant displacement volume pump of being made up of the displacement transducer [3] of threeway servovalve [1], proportional amplifier [2], reflection oil pump capacity, adjusting oil cylinder [4], pump body [5], feature of the present invention is, outlet port at pump body [5] is provided with pack into oil temperature sensor [8], pressure transducer [9], and the other end of oil temperature sensor [8], pressure transducer [9] is connected with compensating circuit [7].
2, a kind of leakage electronic compensating volume-type hydraulic pump constant flow regulation system, it comprises the electric feedback constant displacement volume pump of being made up of the displacement transducer (3) of threeway servovalve (1), proportional amplifier (2), reflection oil pump capacity, adjusting oil cylinder (4), pump body (5), feature of the present invention is, the low differential pressure external leakage flow transducer (6) of connecting between leak fistulae and the compensating circuit (7) of cylinder body (5).
3, a kind of leakage electronic compensating volume-type hydraulic pump constant flow regulation method, feature of the present invention is, on the basis of electric feedback constant displacement pump, by measuring pressure fuel pump, oil temperature, by known penality function input quantity is carried out real-time electronic compensating, thereby obtain the constant flow pump characteristic, when avoiding Hydraulic Pump Constant Flow to regulate fully, on working connection because of the energy loss that flow detecting element causes is set.
4, a kind of leakage electronic compensating volume-type hydraulic pump constant flow regulation method, feature of the present invention is, on the basis of electric feedback constant displacement pump, become to determine relation according to total leakage rate of oil pump and external leakage flow, by only detecting the external leakage flow, carry out real-Time Compensation through the processing of electric signal ratio, thereby obtain the constant flow pump characteristic, when avoiding Hydraulic Pump Constant Flow to regulate fully, because of the energy loss that flow detecting element causes is set on working connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 88100117 CN1015021B (en) | 1988-01-16 | 1988-01-16 | Contant-flow adjustment system and method for volume-type hydraulic pump with electric leakage compensation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 88100117 CN1015021B (en) | 1988-01-16 | 1988-01-16 | Contant-flow adjustment system and method for volume-type hydraulic pump with electric leakage compensation |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1034981A CN1034981A (en) | 1989-08-23 |
| CN1015021B true CN1015021B (en) | 1991-12-04 |
Family
ID=4831185
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 88100117 Expired CN1015021B (en) | 1988-01-16 | 1988-01-16 | Contant-flow adjustment system and method for volume-type hydraulic pump with electric leakage compensation |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1015021B (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101922487A (en) * | 2010-06-18 | 2010-12-22 | 无锡市海航电液伺服系统有限公司 | Oil leak monitoring system of hydraulic servo pump station |
| RU2716647C2 (en) * | 2015-03-10 | 2020-03-13 | Сондерхофф Энджиниэринг Гмбх | Method for compensation of losses due to leaks and transporting system for displacement of certain volume of liquid |
| CN105386953B (en) * | 2015-12-25 | 2017-04-19 | 上海交通大学 | Digital flow-distribution constant-flow radial plunger pump |
| CN105804964B (en) * | 2016-03-15 | 2018-05-29 | 北京星达科技发展有限公司 | High pressure constant flow pump and flow closed loop control method |
| JP7246297B2 (en) * | 2019-12-16 | 2023-03-27 | 日立建機株式会社 | construction machinery |
| CN113606206B (en) * | 2021-05-26 | 2022-04-29 | 广州嘉泰液压机电有限公司 | Hydraulic test oil source system |
-
1988
- 1988-01-16 CN CN 88100117 patent/CN1015021B/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| CN1034981A (en) | 1989-08-23 |
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| PB01 | Publication | ||
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| GR02 | Examined patent application | ||
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| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |