CN215058070U

CN215058070U - Axial plunger pump test prototype of multisensor integration installation

Info

Publication number: CN215058070U
Application number: CN202120505903.0U
Authority: CN
Inventors: 张斌; 程国赞; 洪昊岑; 白大鹏; 贺电; 耿晓晨; 卢志学; 赵春晓; 季清华; 杨华勇
Original assignee: Zhejiang University ZJU
Current assignee: Zhejiang University ZJU
Priority date: 2021-03-10
Filing date: 2021-03-10
Publication date: 2021-12-07
Anticipated expiration: 2031-03-10

Abstract

The utility model discloses an axial plunger pump test model machine of multisensor integration installation relates to plunger pump technical field. The test prototype comprises a matrix pump, a signal acquisition device and a control device; the signal acquisition device comprises a first temperature sensor, a vibration sensor array, an angle sensor, a second temperature sensor, an outlet pressure sensor and an inlet pressure sensor; the utility model discloses a vibration signal, temperature and the pressure signal of base member pump can be acquireed to the signal pickup assembly, judge the operating condition of test model machine under the test operating mode then. Furthermore, the control device can compare the sensor signal with a set threshold value, then judge whether the plunger pump test sample machine has a fault and transmit the result to the alarm for warning. The utility model discloses a plunger pump test model machine has expanded the function of traditional plunger pump, has improved the response precision of plunger pump, can also the short-term test plunger pump whether break down, and need not the manual work and investigate, has improved failure diagnosis efficiency, can reduce the degree that the trouble took place.

Description

Axial plunger pump test prototype of multisensor integration installation

Technical Field

The utility model relates to a plunger pump technical field especially relates to an axial plunger pump test model machine of multisensor integration installation.

Background

The axial plunger pump is a power source in a hydraulic system, is one of core power elements in the hydraulic field, and is widely applied to the fields of machining, transportation, aerospace and the like due to the advantages of small volume, convenience in flow control, long service life and the like.

At present, an axial plunger pump mainly changes the size and the direction of a swash plate swing angle through a variable mechanism, controls the size of a plunger reciprocating stroke, and further adjusts output flow. The traditional axial plunger pump adopts a mechanical variable structure, has a complex structure, and has the problems of insufficient constant power control precision and the like. The production of plunger pump trouble also is gradual change process usually, and the fault accumulation just can produce the destruction to a certain extent promptly, if can take place to shut down when the hydraulic pump damages and change components and parts, will save the cost, improve engineering efficiency. The failure detection of the plunger pump developed so far only depends on manual determination of failure cause and failure position based on experience (expert base) or groping condition, so that the failure diagnosis efficiency of the existing plunger pump is low.

Researchers at home and abroad also perform a great deal of tests on the faults of the plunger pump, and find that the vibration signal energy of the surface of the pump shell is obviously different under the two conditions when a normal pump and a fault pump work, so that the concurrent fault mechanism of the plunger pump is generally researched by selecting and analyzing the vibration signal characteristic of the shell. Therefore, the axial plunger pump test prototype with the multi-sensor fusion installation is developed, which is convenient for researchers to develop the variable characteristic and fault diagnosis mechanism research test of the plunger pump and is also convenient for enterprises to research and develop high-controllability axial plunger pump products.

SUMMERY OF THE UTILITY MODEL

In order to overcome traditional axial plunger pump fault diagnosis rate low, defects such as constant power, pressure, flow control precision, the utility model provides an axial plunger pump test model machine of multisensor fusion installation.

The purpose of the utility model is realized through the following technical scheme:

the utility model provides an axial plunger pump test model machine of multisensor integration installation, it includes: a matrix pump and a signal acquisition device; the signal acquisition device comprises a first temperature sensor, a vibration sensor array, an angle sensor, a second temperature sensor, an outlet pressure sensor and an inlet pressure sensor;

the vibration sensor arrays are arranged on the motor input end surface of the matrix pump and the upper surface, the lower surface, the front surface and the rear surface which are connected with the motor input end surface; first temperature sensor sets up the low pressure entrance at the base member pump, and second temperature sensor sets up in the shell intracavity of base member pump, angle sensor fixed mounting is on the variable mechanism of base member pump, outlet pressure sensor, inlet pressure sensor set up high pressure outlet, the low pressure entrance at the base member pump respectively.

Preferably, the vibration sensor array of each surface of the matrix pump comprises at least two vibration sensors; the vibration sensor is a single-axis vibration sensor and is used for acquiring vibration signals vertical to the direction of the mounting surface of the vibration sensor.

Preferably, the vibration sensors in the vibration sensor array on the input end face of the motor are arranged in a circle around the axis of the motor input shaft; vibration sensors in the vibration sensor array on the upper surface of the matrix pump are positioned right above the axis direction of the motor input shaft and are arranged along a straight line; the vibration sensor is a variable resistance sensor.

Preferably, the vibration sensor is a vibration acceleration sensor or a vibration displacement sensor.

Preferably, the matrix pump is a swash plate type axial variable displacement plunger pump.

Preferably, the angle sensor is a contact type or non-contact type sensor which is used for measuring the angular displacement of the variable mechanism of the matrix pump.

Preferably, the axial plunger pump further comprises a control device, the control device comprises a valve block, a proportional valve, a controller and an alarm, and the controller is connected with each sensor in the acquisition device to acquire sensor signals; the left side of the valve block is connected with the controller, the right side of the valve block is connected with the alarm, the valve block and the proportional valve are fixedly mounted on the matrix pump together, and oil ports on the proportional valve are communicated with corresponding oil ports of the axial plunger pump test sample machine through flow passages in the valve block.

Preferably, the valve block is provided with 3 oil ducts, the connecting ends of the 3 oil ducts and the pump are respectively a low-pressure oil port T, a control oil port C and a high-pressure oil port P, wherein the low-pressure oil port T is connected with a pump shell cavity of the plunger pump, and the other end of the low-pressure oil port T is connected with a port T of the proportional valve; the control oil port C is communicated with the variable mechanism oil cavity, and the other end of the control oil port C is connected with the proportional valve control oil port; one end of the high-pressure oil port P is connected with a high-pressure outlet of the plunger pump, and the other end of the high-pressure oil port P is connected to a high-pressure port of the proportional valve. When the proportional valve is powered on, the current of the coil of the electromagnet is controlled by providing PWM duty ratios with different sizes for the electromagnet, and the motion of the inner valve core is pushed, so that the flow entering the oil pump variable mechanism can be controlled by controlling the conduction degree of the control oil port C with the high-pressure oil port P or the control oil port C with the low-pressure oil port T, and the whole variable process is completed.

Preferably, the controller is a double-master-control chip type controller; the controller comprises a duty ratio modulator, and the duty ratio modulator outputs the duty ratio to drive the valve core of the proportional valve to move so as to control the variable process of the plunger pump.

Preferably, the alarm is connected with the controller, the alarm comprises a sound alarm module and a display interface, the display interface is used for displaying the working state of the plunger pump, and the sound alarm module is used for sending an abnormal working alarm.

The utility model has the advantages that:

1. the utility model discloses a plunger pump carries out the integrated design with the pump body with collection system, compact structure, and the integrated level is high.

2. The utility model discloses can further integrated control device, controlling means can carry out the control task according to external control system's control signal, for example carries out the control of flow, pressure, constant power. The utility model discloses except can carrying out the test research of traditional pump model machine working process, still can further utilize controlling means to carry out capability test to software or control program in the external control system.

3. Because the back breaks down, pump case surface vibration signal energy is showing differently, the utility model discloses a test model machine utilizes the vibration sensor array, has the function of judging whether self breaks down fast, and need not the manual work and investigate, has improved failure diagnosis efficiency. When the plunger pump has slight fault, the plunger pump can be detected and stopped to replace the fault part, the damage degree of the fault part can be reduced, the engineering construction efficiency can be improved, and casualties and long-term shutdown loss caused by damage can be prevented from directly occurring in the construction process.

Drawings

The following further describes the present invention with reference to the drawings and examples.

FIG. 1 is a front view of a multisensor fusion mounted axial plunger pump;

FIG. 2 is a rear view of a multi-sensor fusion mounted axial plunger pump;

FIG. 3 is a bottom view of a multi-sensor fusion mounted axial plunger pump;

FIG. 4 is a top view of a multi-sensor fusion mounted axial plunger pump;

FIG. 5 is a left side view of a multi-sensor fusion mounted axial plunger pump;

FIG. 6 is a schematic diagram of a control device of a multi-sensor fusion-mounted axial plunger pump;

FIG. 7 is a schematic view of the internal working principle of the vibration sensor;

FIG. 8 is a schematic view of a measuring device for a multi-sensor fusion mounted axial plunger pump;

in the figure, a valve block 1, a proportional valve 2, a first temperature sensor 3, a matrix pump 4, a controller 5, an X-axis positive square arrangement vibration sensor 6, an angle sensor 7, a second temperature sensor 8, an X-axis negative rectangular arrangement vibration sensor 9, an outlet pressure sensor 10, an inlet pressure sensor 11, a Z-axis negative rectangular arrangement vibration sensor 12, a Z-axis positive linear arrangement vibration sensor 13, a Y-axis negative circumferential arrangement vibration sensor 14, and an alarm 15.

Detailed Description

The present invention will be further described with reference to the accompanying drawings and specific examples, which are intended to illustrate embodiments of the invention in many different forms, and the scope of the invention is not limited to the embodiments described herein.

As shown in fig. 1 to 8, the axial plunger pump test prototype with the multiple sensors installed in a fusion manner comprises a valve block 1, a proportional valve 2, a first temperature sensor 3, a matrix pump 4, a controller 5, an X-axis positive square arrangement vibration sensor array 6, an angle sensor 7, a second temperature sensor 8, an X-axis negative rectangular arrangement vibration sensor array 9, an outlet pressure sensor 10, an inlet pressure sensor 11, a Z-axis negative rectangular arrangement vibration sensor array 12, a Z-axis positive linear arrangement vibration sensor array 13, a Y-axis negative circumferential arrangement vibration sensor array 14 and an alarm 15.

It should be noted that, as shown in fig. 1 and 5, the Z axis in this embodiment refers to a vertical upward direction after the plunger pump is installed; the Y-axis refers to the direction along the mounting axis of the plunger pump; and establishing a right-hand coordinate system, and further marking an X axis.

In this embodiment, each vibration sensor array comprises at least nine sensors, the vibration sensors are selectable as variable resistance sensors, and the mounting positions are selected according to the flatness of the base pump housing: the vibration sensor group is installed differently for the shape of five side surfaces (except for the installation surface) of the pump casing of the matrix pump: the front surface, the back surface and the lower surface of the matrix pump shown in FIG. 1 are respectively provided with 9 vibration sensors which are arranged in a square shape; the upper surface of the matrix pump is provided with 10 vibration sensors which are arranged linearly; 12 vibration sensors are circumferentially distributed on the motor input end surface of the matrix pump; the vibration signals in the axial direction of the substrate pump X, Y, Z are collected by installing the sensors; as shown in fig. 7, when the plunger pump is operating normally, the output signals of the sensors are all operating within a predetermined range, but when a fault occurs, the absolute value of the displacement of the vibration sensor is too high, so that the output signals exceed the predetermined range, and the fault signals can be determined. The utility model discloses the purpose of installing a plurality of sensors formation sensor array on each installation face is avoided leading to the erroneous judgement because of single sensor installation is not hard up or breaks down. The number of the sensors on the single mounting surface is increased, more abundant vibration signals can be obtained, and the research on the working state of a test prototype is facilitated.

In this embodiment, the first temperature sensor and the second temperature sensor are thermocouples, the detection ends of the first temperature sensor and the second temperature sensor are arranged in the low-pressure oil inlet and the shell cavity, the signal output ends of the first temperature sensor and the second temperature sensor are connected with the controller, the oil temperature of the oil inlet and the average temperature of the plunger pump during working can be detected, and the working temperature range T1-T2 of the plunger pump is set on the controller. When the plunger pump is started, when the oil temperature is detected to be lower than T1, the oil viscosity is high, the controller can inhibit the plunger pump variable, after the motor idles for a period of time, the oil temperature rises to T1, the controller removes the inhibition function, and the plunger pump works normally; if the oil temperature is too high (at the moment, an accident can happen when the hydraulic system continues to work), the controller displays the result of the 'oil temperature is too high' on a screen of the alarm. Usually, the external control system or the operator can on the one hand decelerate the motor and stop it or reduce the opening of the proportional valve, so that the system is restored to the initial position, the system is stopped, cooled down by natural cooling or cooled by water.

In this embodiment, the inlet pressure sensor and the outlet pressure sensor may be piezoelectric sensors, and the detection ends are installed at the low-pressure inlet and the high-pressure outlet of the plunger pump to collect the pressure at the inlet and the outlet of the plunger pump; the angle sensor can be a Hall angle sensor, the detection section is arranged on the shell of the plunger pump, and the angular displacement of the variable mechanism of the plunger pump can be collected. The control device mainly comprises a valve block, an alarm, a controller and a proportional valve, wherein as shown in fig. 6, the left side of the valve block is connected with the controller, the right side of the valve block is connected with the alarm, and the valve block and the proportional valve are arranged on the matrix pump through four screws. Taking pressure control as an example, when the plunger pump works, the outlet pressure sensor detects outlet pressure P2 and transmits a signal to the controller, and an external control system or an operator can adjust the opening of the proportional valve to adjust the displacement of the variable mechanism and quickly control the outlet pressure of the plunger pump to reach a set value; the controller has an alarm function, detects the detection signal in real time, takes the pressure signal as an example, and gives an alarm when the pressure detection value is found to exceed or be lower than the allowable safety threshold range. Similarly, the flow and constant power control are similar to the above process, and are not described herein.

The utility model discloses an axial plunger pump test model machine includes controlling means, controlling means include valve block 1, proportional valve 2, controller 5 and alarm 15, the controller 5 with each sensor in the collection system link to each other and acquire the sensor signal; the left side of the valve block 1 is connected with the controller 5, the right side of the valve block is connected with the alarm 15, the valve block and the proportional valve 2 are fixedly mounted on the base pump 4 together, oil ports on the proportional valve are communicated with corresponding oil ports of the base pump through a flow passage in the valve block, in the embodiment, the valve block is provided with 3 oil ducts, the oil ports of the 3 oil ducts are respectively a low-pressure oil port T, a control oil port C and a high-pressure oil port P, the three oil ports are respectively connected with three mounting ports on the pump, wherein the low-pressure oil port T is connected with a plunger pump shell cavity and can return oil to the oil tank, and the other end of the low-pressure oil port T is connected with the proportional valve T through the flow passage in the valve block; one end of the control oil port C is communicated with the variable mechanism oil cavity, and the other end of the control oil port C is connected with the proportional valve control oil port through a flow passage in the valve block; one end of the high-pressure oil port P is connected with a high-pressure outlet of the plunger pump, and the other end of the high-pressure oil port P is connected to a high-pressure port of the proportional valve through a flow passage in the valve block; when the proportional valve is powered on, the current of the coil of the electromagnet is controlled by providing PWM duty ratios with different sizes for the electromagnet, and the motion of the inner valve core is pushed, so that the flow entering the oil pump variable mechanism can be controlled by controlling the conduction degree of the control oil port C with the high-pressure oil port P or the control oil port C with the low-pressure oil port T, and the whole variable process is completed.

The controller 5 is a dual-master-control chip type controller, a preset threshold value of each sensor signal is arranged in the controller 5, when the detected sensor signal exceeds the set threshold value by a certain proportion (the proportion can be set to be 0-20%), the detected signal is judged to be abnormal, and then manual control can be performed according to needs or the controller outputs a control signal to regulate and control a proportional valve. The controller comprises a duty ratio modulator, and in the embodiment, the control of the proportional valve controls the variable process of the plunger pump by controlling the valve core to move by outputting the duty ratio through the duty ratio modulator. When testing an external control system or control software, the controller of the utility model needs to display and early warn according to the threshold judgment result, and can adjust the movement of the variable mechanism according to the duty ratio value set by the external control system or the control software under the condition that the judgment result is normal working condition (only when the controller judges that the working state is extremely abnormal, the controller outputs the duty ratio proportional valve to operate so as to avoid the damage of a plunger pump test sample machine); or the control signal (duty ratio) can be completely generated by an external control system or control software, and the control signal can be executed by the duty ratio modulator outputting the duty ratio or directly outputting a duty ratio voltage signal to the proportional valve by the external control system for control.

When an axial plunger pump test prototype with multiple sensors in fusion mounting works, the vibration, temperature, pressure and angle sensors transmit vibration signals, temperature signals, pressure signals and angle signals to the control device, and the test prototype controller can judge whether the plunger pump fails or not by comparing the vibration signals with a preset threshold value; according to the pressure and temperature signals, the test prototype controller can monitor whether the working temperature and the load of the hydraulic system are reasonable (when the load is abnormal or the temperature is abnormal, the test prototype controller needs to be stopped for maintenance); according to the angle signal, the test prototype controller can monitor the pulsation of the flow of the hydraulic system to evaluate the stability of the power system. If no fault occurs, the controller transmits a signal to the alarm, and a display screen on the alarm can display the working oil temperature, system pressure and outlet flow of the plunger pump in real time. When the controller judges that the hydraulic part in the plunger pump breaks down through the threshold value, the controller transmits the diagnosis result to the alarm to warn, and the controller can stop the plunger pump quickly according to the requirement so as to reduce the fault degree. The staff sees the warning result, can maintain the plunger pump according to particular case.

The utility model discloses a plunger pump test model machine can improve the response precision of plunger pump, still can break down with the short-term test plunger pump, and need not the manual work and investigate, has improved failure diagnosis efficiency, still can reduce the degree that the trouble takes place.

Claims

1. The utility model provides an axial plunger pump test prototype of multisensor fusion installation which characterized in that includes: a matrix pump (4) and a signal acquisition device; the signal acquisition device comprises a first temperature sensor (3), a vibration sensor array, an angle sensor (7), a second temperature sensor (8), an outlet pressure sensor (10) and an inlet pressure sensor (11);

the motor input end surface on the matrix pump (4) and the upper, lower, front and rear surfaces connected with the motor input end surface are all provided with vibration sensor arrays; first temperature sensor (3) set up in the low pressure entrance of base member pump (4), and second temperature sensor (8) set up in the shell intracavity of base member pump (4), angle sensor (7) fixed mounting is on the variable mechanism of base member pump (4), outlet pressure sensor (10), inlet pressure sensor (11) set up respectively in high pressure export, the low pressure entrance of base member pump (4).

2. The multi-sensor fusion mounted axial plunger pump test prototype of claim 1, wherein the vibration sensor array of each surface of the matrix pump comprises at least two vibration sensors; the vibration sensor is a single-axis vibration sensor and is used for acquiring vibration signals vertical to the direction of the mounting surface of the vibration sensor.

3. The axial plunger pump test prototype with multi-sensor fusion installation according to claim 1 or 2, characterized in that the vibration sensors in the vibration sensor array of the motor input end face are arranged circumferentially around the motor input shaft axis; vibration sensors in the vibration sensor array on the upper surface of the matrix pump are positioned right above the axis direction of the motor input shaft and are arranged along a straight line; the vibration sensor is a variable resistance sensor.

4. The axial plunger pump test prototype with multi-sensor fusion installation according to claim 1 or 2, characterized in that the vibration sensor is a vibration acceleration sensor or a vibration displacement sensor.

5. The axial plunger pump test prototype with multi-sensor fusion installation according to claim 1, characterized in that the matrix pump (4) is a swash plate axial variable plunger pump.

6. The axial plunger pump test prototype with multi-sensor fusion installation according to claim 1, characterized in that the angle sensor (7) is a contact or non-contact sensor for measuring the angular displacement of the variable mechanism of the matrix pump (4).

7. The axial plunger pump test prototype with the multi-sensor fusion installation function according to claim 1, characterized in that the axial plunger pump test prototype further comprises a control device, the control device comprises a valve block (1), a proportional valve (2), a controller (5) and an alarm (15), and the controller (5) is connected with each sensor in the acquisition device to acquire sensor signals; the left side of the valve block (1) is connected with the controller (5), the right side of the valve block is connected with the alarm (15), and the valve block and the proportional valve (2) are fixedly arranged on the base pump (4);

the valve block is provided with 3 oil ducts, the connecting ends of the 3 oil ducts and the pump are respectively a low-pressure oil port T, a control oil port C and a high-pressure oil port P, wherein the low-pressure oil port T is connected with a plunger pump shell cavity, and the other end of the low-pressure oil port T is connected with a proportional valve T port; the control oil port C is communicated with the variable mechanism oil cavity, and the other end of the control oil port C is connected with the proportional valve control oil port; one end of the high-pressure oil port P is connected with a high-pressure outlet of the plunger pump, and the other end of the high-pressure oil port P is connected to a high-pressure port of the proportional valve.

8. The axial plunger pump test prototype of multi-sensor fusion installation according to claim 7, characterized in that the controller (5) is a dual master control chip-type controller; the controller comprises a duty ratio modulator, and the duty ratio modulator outputs the duty ratio to drive the valve core of the proportional valve (2) to move so as to control the variable process of the plunger pump.

9. The axial plunger pump test prototype with multi-sensor fusion installation according to claim 7, characterized in that the alarm (15) is connected with the controller, the alarm (15) comprises an acoustic alarm module and a display interface, the display interface is used for displaying the working state of the plunger pump, and the acoustic alarm module is used for sending an abnormal working alarm.