A flow intelligent calibration gear pump

Abstract

The present invention discloses a flow intelligent calibration gear pump, which relates to the technical field related to gear pumps, including a gear pump body, a main oil inlet and a main oil outlet are provided on the gear pump body, a main valve for changing the flow direction of liquid in the gear pump is arranged in the gear pump body, a first oil inlet, a first oil outlet and a throttle are arranged on the main valve, the first oil outlet and the throttle are respectively used as the oil outlet ends of two positions of the main valve, a pilot valve is also arranged in the gear pump body, a pressure sensor for detecting the pressure of liquid in the pump is also arranged on the gear pump body, a valve core of the pilot valve is connected to a driving motor, the pressure sensor is connected to the driver, a directional control valve, a pressure sensor and the like are integrated with the gear pump, and the flow is calibrated using the corresponding relationship between pressure and flow. The switching of the main valve is controlled by the pilot valve, so that the switching force required by the main valve core under large flow conditions can be met, and at the same time, the whole pump has a compact structure, small size and light weight.

Description

Technical Field

[0001] The present invention belongs to the technical field related to gear pumps, and more specifically, particularly relates to a flow intelligent calibration gear pump. Background Art

[0002] The gear pump is a power element of hydraulic and fuel systems. During the operation of the gear pump, due to the relative movement and friction of the gear end faces, the gear end faces will be worn in the long term, the gear end face clearance will increase, and the leakage of the gear end face clearance will increase accordingly, then the gear pump outlet flow rate will decrease, and the existing gear pump cannot perform real-time detection and calibration of its actual flow rate during operation. Therefore, after the gear pump has been working for a long time, its flow rate will not meet the use requirements and its life span will be short. Summary of the invention

[0003] The embodiment of the present application solves the problems existing in the prior art by providing a flow intelligent calibration gear pump, integrating the directional control valve, pressure sensor, etc. with the gear pump, and calibrating the flow rate using the corresponding relationship between pressure and flow rate. The switching of the main valve is controlled by the pilot valve, which can meet the switching force required by the main valve core under large flow conditions. At the same time, the whole pump has a compact structure, small size and light weight.

[0004] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0005] A flow intelligent calibration gear pump comprises a gear pump body, the gear pump body is provided with a main oil inlet and a main oil outlet, the gear pump body is provided with a motor assembly, a gear pump assembly and a control valve assembly; the control valve assembly comprises a main valve arranged in the gear pump body for changing the flow direction of the liquid in the gear pump, the main valve is provided with a first oil inlet, a first oil outlet and a throttle port, the first oil outlet and the throttle port respectively serve as the oil outlet ends of two positions of the main valve, a pilot valve for controlling the reversing of the main valve valve core is also arranged in the gear pump body, a pressure sensor for detecting the pressure of the liquid in the pump is also arranged on the gear pump body, the valve core of the pilot valve is connected to the drive motor motor assembly, and the pressure sensor is connected to an external driver.

[0006] In order to further optimize the present invention, the following technical solutions may be preferably used:

[0007] Preferably, the pilot valve is provided with a second oil inlet, a third regulating port, a fourth regulating port, and a fifth regulating port; the first oil inlet and the second oil inlet are connected to the main oil inlet; and the first oil outlet is connected to the main oil outlet.

[0008] Preferably, the main valve is provided with a first regulating port and a second regulating port corresponding to both ends of the main valve core, which are respectively connected to the third regulating port and the fifth regulating port of the pilot valve, and a return spring is provided in the main valve corresponding to one end of the main valve core.

[0009] Preferably, the fourth regulating port is arranged in the middle of the pilot valve, and the fourth regulating port is always connected with the inner chamber of the pilot valve.

[0010] Preferably, the main valve and the pilot valve are both two-position four-way valves.

[0011] Preferably, the throttle port flows back to the inlet of the gear pump.

[0012] A flow calibration method for a flow intelligent calibration gear pump comprises the following steps: when the pump needs to be calibrated, a host computer issues an instruction, a pilot solenoid valve is energized, a hydraulic force pushes a main valve core to move rightward, the pump outlet is closed, a throttling port is opened, throttling is generated, and the corresponding throttling pressure is different under different flow rates. If the pressure obtained by the pressure sensor is smaller than the calibration value, it indicates that the flow rate of the gear pump has decreased. The pressure drop is compensated by increasing the motor speed so that the throttling pressure reaches the calibration value and the flow correction is completed; when the pump is corrected according to a set of calibration working conditions, the flow calibration of the pump is completed, and a new flow instruction curve is fitted according to the correction value and saved, and the flow calibration is completed at this time; when the solenoid valve is powered off, the normal working state is restored, and the new flow instruction works according to the new calibration flow curve.

[0013] One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:

[0014] 1. The pump is mainly used in the following working conditions: ① The outlet flow of the pump remains unchanged at the set value for a long time to ensure that the outlet flow meets the use requirements; ② The pump has a long service life. The wear of parts will cause the flow to drop, which limits the service life of the gear pump. Through intelligent flow calibration, feedback is given to the motor, and the motor adjusts the speed to compensate for the flow drop; ③ The system has the highest safe working pressure requirement;

[0015] 2. The integrated structural design of this product realizes intelligent calibration of flow, ensures stable outlet flow and meets the set value requirements; the directional control valve, pressure sensor and gear pump are integrated. The flow is calibrated using the corresponding relationship between pressure and flow. The switching of the main valve is controlled by the pilot valve, which can meet the switching force required by the main valve core under large flow conditions. At the same time, the whole pump has a compact structure, small size and light weight.

[0016] 3. This product detects the system pressure in real time and releases the oil when it exceeds the set pressure to ensure safe use. The system pressure is detected by the pressure sensor. If it exceeds the set pressure, the pilot valve coil is energized to close the outlet and the oil releases from the throttle port.

[0017] 4. This product can increase the service life of the gear pump. During the use of the gear pump, the floating side plate and the gear will rub against each other, which will increase the gap between the gear ends, increase the leakage, and reduce the outlet flow, which will limit the service life of the gear pump. Through intelligent flow calibration, the service life of the gear pump can be greatly increased.

[0018] 4. The gear pump head is integrated with a pressure sensor and a reversing valve. The flow rate change is determined by detecting the pressure in the pump body. If the measured pressure is lower than the calibrated pressure value, the pump flow rate is reduced. By increasing the motor speed, the throttling pressure reaches the calibrated value and the flow rate is corrected. At the same time, the new flow command curve is fitted according to the correction value and saved. At this time, the flow calibration is completed. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is the overall structural diagram of the gear pump;

[0020] Figure 2 This is a side view of the gear pump;

[0021] Figure 3 This is the cross-sectional view of the gear pump at B_B;

[0022] Figure 4 This is the cross-sectional view of the gear pump at CC;

[0023] Figure 5 This is the working principle diagram of this pump body;

[0024] Figure 6 It is a schematic diagram of the initial state of the pump body;

[0025] Figure 7 This is a schematic diagram of the normal working state of the pump body;

[0026] Figure 8 It is a structural schematic diagram of the flow calibration state;

[0027] Fig. 9 It is a flow chart of the pump body;

[0028] Fig.10 It is a schematic diagram of the control valve body shell structure;

[0029] Fig.11 Schematic diagram of the internal structure of the control valve body shell.

[0030] Among them, 1-motor assembly, 2-gear pump assembly, 3-control valve assembly, 4-pilot valve, 5-main oil inlet, 6-main oil outlet, 7-reset spring, 8-main valve core, 9-throttle port 1, 10-pressure sensor, 11-pilot valve core, 12-first regulating port, 13-second regulating port, 14-second oil inlet, 15-third regulating port, 16-fourth regulating port, 17-fifth regulating port, 18-driving source. DETAILED DESCRIPTION

[0031] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0032] Embodiment 1:

[0033] like Figure 1-11 As shown, a flow intelligent calibration gear pump comprises a gear pump body, a main oil inlet 5 and a main oil outlet 6 are provided on the gear pump body, a motor assembly 1, a gear pump assembly 2 and a control valve assembly 3 are installed on the gear pump body; the control valve assembly comprises a control valve housing installed on the gear pump, a main valve for changing the flow direction of the liquid in the gear pump is installed in the control valve housing, a first oil inlet, a first oil outlet and a throttle port 1 are provided on the main valve, the first oil outlet and the throttle port 1 9 are respectively used as the oil outlet ends of the two positions of the main valve, the throttle port returns to the main oil inlet of the gear pump, and the first oil outlet is communicated with the main oil outlet; a pilot valve 4 for controlling the reversing of the main valve spool is also installed in the control valve housing, a pressure sensor 10 for detecting the pressure of the liquid in the pump is also arranged on the gear pump body, the pilot valve spool 11 is connected to a driving source 18, and the pressure sensor is electrically connected to the driving source 18 through a controller. The main valve and the pilot valve are both two-position four-way valves, and mounting holes are provided on the control valve housing corresponding to the positions of the pilot valve core 11 and the main valve core 8 to ensure the compactness of the overall structure; the pilot valve is provided with a second oil inlet 14, a third regulating port 15, a fourth regulating port 16, and a fifth regulating port 17, the first oil inlet and the second oil inlet are connected to the main oil inlet, the first oil outlet is connected to the main oil outlet, the fourth regulating port is provided in the middle of the pilot valve, and the fourth regulating port is always connected to the inner chamber of the pilot valve. In addition, in order to realize control and regulation, the first regulating port 12 and the second regulating port 13, which are respectively connected to the throttle port 9 and the fifth regulating port of the pilot valve, are provided at the positions corresponding to the two ends of the main valve core on the main valve, and a reset spring 7 is provided in the main valve corresponding to one end of the main valve core to facilitate the reset of the main valve core.

[0034] The working principle of this pump body:

[0035] (1) In the initial state, the gear pump does not work, the pilot valve is not energized, and the main valve core is at the right end under the action of the return spring, that is, the main oil outlet is closed and the throttle port is open.

[0036] (2) In normal working state, the gear pump is working, the pilot valve is not energized, the pilot valve controls the main valve core to move to the left, the pump outlet is opened, and the gear pump realizes continuous oil supply.

[0037] (3) Flow calibration status

[0038] When the pump needs to be calibrated, the host computer issues a command, the pilot solenoid valve is energized, the hydraulic force pushes the main valve core to the right, closes the pump outlet, opens the throttle port, and generates throttling. Under different flow rates, the corresponding throttling pressure is different. If the pressure obtained by the pressure sensor is smaller than the calibration value, it means that the gear pump flow rate has decreased. The pressure drop is compensated by increasing the motor speed, so that the throttling pressure reaches the calibration value and the flow correction is completed. When the pump is corrected according to a set of calibration conditions, the pump flow calibration is completed, and the new flow command curve is fitted according to the correction value and saved. At this time, the flow calibration is completed. After the solenoid valve is powered off, it returns to normal working state, and the new flow command works according to the new calibrated flow curve.

[0039] Although the preferred embodiments of the present invention have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0040] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A flow intelligent calibration gear pump, comprising a gear pump body, the gear pump body is provided with a main oil inlet and a main oil outlet, the gear pump body is provided with a motor assembly, a gear pump assembly, and a control valve assembly; the control valve assembly comprises a main valve arranged in the gear pump body for changing the flow direction of the liquid in the gear pump, characterized in that: The main valve is provided with a first oil inlet, a first oil outlet, and a throttle port, the first oil outlet and the throttle port are respectively used as the oil outlet ends of the two positions of the main valve, the gear pump body is also provided with a pilot valve for controlling the reversing of the main valve spool, the gear pump body is also provided with a pressure sensor for detecting the liquid pressure in the pump, the spool of the pilot valve is connected with a drive motor motor assembly, and the pressure sensor is connected with an external driver; the pilot valve is provided with a second oil inlet, a third regulating port, a fourth regulating port, and a fifth regulating port, the first oil inlet and the second oil inlet are connected to the main oil inlet, and the first oil outlet is connected to the main oil outlet; the main valve is provided with a first regulating port and a second regulating port connected to the third regulating port and the fifth regulating port of the pilot valve respectively at the positions corresponding to the two ends of the main valve spool, and a reset spring is provided in the main valve at the position corresponding to one end of the main valve spool; the fourth regulating port is provided in the middle of the pilot valve, and the fourth regulating port is kept in constant communication with the inner chamber of the pilot valve; the main valve and the pilot valve are both two-position four-way valves.

2. A flow intelligent calibration gear pump according to claim 1, characterized in that: The throttle port flows back to the main oil inlet of the gear pump.

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