阅读说明：本技术 一种脉动衰减器性能测试装置及方法 (Performance testing device and method for pulsation attenuator ) 是由 温华兵 邵传民 李兵 常程威 张坤 张帆 于 2019-10-29 设计创作，主要内容包括：本发明公开了一种脉动衰减器性能测试装置,包括液体压力脉动发生系统、液体静压加载系统和油液的可循环利用系统。本发明在待测脉动衰减器进口一侧连通液体压力脉动发生系统,在出口一侧连通液体静压加载系统。通过PLC系统控制电磁阀的开闭让管内液体产生脉动,再通过蓄能器和节流阀对管内液体产生静压力,最终通过安装在待测脉动衰减器进出口的两个压力传感器采集待测脉动衰减器进口液压和出口液压,并按公式<Image he="123" wi="361" file="DDA0002251298510000011.GIF" imgContent="drawing" imgFormat="GIF" orientation="portrait" inline="no"></Image>计算得出待测脉动衰减器衰减性能。装置组成结构简单、易于拆装且操作简单方便,精度满足工程需要,具有较高的工程应用价值。本发明还公开了一种脉动衰减器性能测试装置的测试方法。(The invention discloses a performance testing device of a pulsation attenuator, which comprises a liquid pressure pulsation generating system, a hydrostatic pressure loading system and a recyclable oil liquid system. According to the invention, a liquid pressure pulsation generating system is communicated with one side of an inlet of the pulsation attenuator to be tested, and a liquid static pressure loading system is communicated with one side of an outlet. The PLC system controls the opening and closing of the electromagnetic valve to enable liquid in the pipe to pulsate, then the energy accumulator and the throttle valve generate static pressure on the liquid in the pipe, finally the inlet hydraulic pressure and the outlet hydraulic pressure of the pulsation attenuator to be detected are collected through two pressure sensors arranged at the inlet and the outlet of the pulsation attenuator to be detected, and the formula is adopted And calculating to obtain the attenuation performance of the pulsation attenuator to be measured. Device assemblySimple structure, easy dismouting and easy operation are convenient, and the precision satisfies the engineering needs, has higher engineering using value. The invention also discloses a testing method of the device for testing the performance of the pulsation attenuator.)

1. The utility model provides a pulsation attenuator capability test device, includes the support, its characterized in that: the bracket is sequentially communicated with a liquid pressure pulsation generating system, a hydrostatic pressure loading system and an oil recycling system in a closed loop manner through pipelines;

the liquid pressure pulsation generating system comprises a pulsation generating assembly (1), a first pipe (2) and a first pressure sensor (5); wherein the pulsation generating assembly (1) is formed by: the device comprises a pump (1-1), a pipe II (1-2), a PLC control system (1-3) and an electromagnetic valve (1-4), wherein the inlet of the pump (1-1) and the inlet of the electromagnetic valve (1-4) are hermetically connected through the pipe II (1-2), one end of the pipe I (2) is communicated with a pulsation generating assembly (1), the other end of the pipe I (2) is hermetically connected with the inlet of a pulsation attenuator (7) to be detected, a first pressure sensor (5) is arranged on the pipe I (2) close to the inlet of the pulsation attenuator (7) to be detected, and a collecting end extends into the pipe I (2); the hydrostatic pressure loading system comprises a second pressure sensor (9), a third pipe (10), an energy accumulator (13) and a throttle valve (14), one end of the third pipe (10) is hermetically connected with an outlet of the pulsation attenuator to be detected (7), the other end of the third pipe is hermetically connected with the throttle valve (14), the second pressure sensor (9) is arranged on the third pipe (10) close to the outlet of the pulsation attenuator to be detected (7), a collecting end of the second pressure sensor extends into the third pipe (10), the central axes of the first pipe (2) and the third pipe (10) are at the same horizontal height, the energy accumulator (13) is arranged on the third pipe (10), and a liquid inlet of the energy accumulator is communicated with the third pipe (10) in a pipe; the oil recycling system comprises a pipe four (15), a hose (17), an oil tank (18) and an oil pipe (21), wherein the pipe four (15) is hermetically connected with a throttle valve (14), the pipe four (15) is connected with the hose (17) through a screw thread (16), the hose (17) extends into the oil tank (18), and the oil tank (18) is connected with a pump (1-1) through the oil pipe (21) to form a closed-loop system.

2. The pulsation attenuator performance test apparatus according to claim 1, characterized in that: the first pipe (2) is formed by hermetically connecting two branch pipes I (2-1) and II (2-2) which have the same diameter and different lengths through a first flange (3); the third pipe (10) is formed by hermetically connecting two branch pipes III (10-1) and IV (10-2) which have the same diameter and different lengths through a second flange (11).

3. The pulsation attenuator performance test apparatus according to claims 1-2, characterized in that: the pulsation attenuator performance test device further includes: a first electromagnetic flow meter (4) and a second electromagnetic flow meter (12); the first electromagnetic flowmeter (4) is arranged on the first pipe (2) and used for measuring the flow rate when the fluid flows into the pulsation attenuator (7) to be measured; and the second electromagnetic flowmeter (12) is arranged on the third pipe (10) and is used for measuring the flow rate when the pulsation attenuator (7) to be measured flows out.

4. The pulsation attenuator performance test apparatus according to claims 1-2, characterized in that: the pulsation attenuator performance test device further includes: a first adapter tube (6) and a second adapter tube (8); the first adapter tube (6) is arranged between the first tube (2) and the pulsation attenuator (7), one end of the first adapter tube is hermetically connected with the first tube (2), and the other end of the first adapter tube is hermetically connected with an inlet of the pulsation attenuator (7) to be tested; the second adapter tube (8) is arranged between the pulsation attenuator to be tested (7) and the tube III (10), one end of the second adapter tube is hermetically connected with an outlet of the pulsation attenuator to be tested (7), and the other end of the second adapter tube is hermetically connected with the tube III (10).

5. A testing method of a pulsation attenuator performance testing device is characterized by comprising the following steps:

s1: the inlet of the pulsation attenuator (7) to be measured is hermetically connected with the first pipe (2), and the outlet of the pulsation attenuator is hermetically connected with the third pipe (10);

s2: oil is injected into the oil tank (18) through an oil plug (19), and the oil is injected into the pipeline through the oil pump (1-1);

s3: regulating hydrostatic pressure in the pipeline by means of the accumulator (13) and a throttle (14);

s4: the pulsation generating assembly (1) generates liquid pulsation to oil;

s5: the first pressure sensor (5) collects the inlet pressure P1 of the pulsation attenuator (7) to be measured;

s6: the second pressure sensor (9) collects the outlet pressure P2 of the pulsation attenuator (7) to be measured;

s7: according to the formula

6. The testing method of the pulsation attenuator performance testing apparatus according to claim 5, wherein the specific method of adjusting the hydrostatic pressure in the pipe by the accumulator (13) and the throttle valve (14) in S3 is: the throttle valve (14) adjusts the pressure in the pipeline by adjusting the flow of the pipeline, and adjusts and maintains the static pressure by the accumulator (13).

7. The testing method of the pulsation attenuator performance testing apparatus according to claim 5, wherein the pulsation generating module (1) generates liquid pulsation in S4 by: the PLC control system (1-3) controls the flow of the oil liquid by controlling the opening and closing of the electromagnetic valves (1-4) to enable the oil liquid to generate pulsation, the opening and closing times of the electromagnetic valves (1-4) are set in the PLC control system (1-3) to enable the oil liquid to generate different pulsation frequencies, and the range of achievable pulsation frequencies is 5Hz to 600 Hz.

Technical Field

The invention relates to a testing device and method for a pulsation attenuator, in particular to a performance testing device for the pulsation attenuator, and belongs to the technical field of testing.

Background

Among various mechanical devices, hydraulic systems are increasingly widely used. Some hydraulic systems are more core components in mechanical equipment, and the performance of the hydraulic system directly determines the quality of the mechanical equipment. Along with the development of a hydraulic system in the direction of high speed, high pressure and high power, the pulsation of the hydraulic system can cause the vibration and noise of mechanical equipment, and when the pulsation is too large, the equipment can be damaged even, so that the equipment cannot normally run. Such as: the oil pressure pulsation of a thrust bearing on a warship shafting causes the shafting to vibrate greatly, the stealth performance of a ship can be influenced, and the fighting capacity of the ship is directly weakened. Therefore, the method has important significance for testing and evaluating the vibration attenuation effect of the pulsation attenuator. At present, the research on the pulsation attenuator theory and the testing technology thereof is not deep, and the design theory is still imperfect. Measuring the performance of the pulsation attenuator is an important way to evaluate whether the pulsation attenuator is effective. The performance of the pulsation attenuator is measured, and the relationship of the ratio of the inlet pressure pulsation to the outlet pressure pulsation of the pulsation attenuator along with the frequency change is mainly tested under constant pressure, so that the main evaluation index of the transmission loss of the pressure pulsation is measured.

The hydraulic vibration test bench proposed in "analysis of intrinsic characteristics of diaphragm type fluid pulsation attenuator", published in "the university of south and central university" (nature science edition), vol.46, has a frequency modulation motor cooperating with a plunger pump to generate hydraulic pulsation, a throttle valve to realize static pressure loading, and pressure sensors at two ends of the pulsation attenuator to measure pulsation attenuation. The disadvantages mainly include: the pressure pulsation is realized by adjusting the rotating speed of the variable frequency motor, the rotating speed range of the adjustable motor of a common frequency converter is limited, and when the constant power output characteristic of more than 50Hz is adjusted, the rotating speed of the motor rises and the torque inevitably falls. When the torque drops to the hydrostatic dead load, the rotational speed cannot be increased.

The invention patent with application number 201710568419.0 and named as 'a pulsation attenuator performance testing device and a testing method' provides a pulsation attenuator performance testing device, which utilizes a vibration exciter to push a lever so as to drive a boosting piston to move left and right in a pulsation generating pipe to generate liquid pulsation, and utilizes pressure sensors at two ends of a pulsation attenuator to measure pulsation attenuation. The exciting frequency of the vibration exciter is 50-2000 Hz. The disadvantages mainly include: the attenuation effect of the pulsation attenuator below 50Hz cannot be measured; the vibration exciter is expensive.

Disclosure of Invention

The present invention is directed to solve the above problems and disadvantages of the prior art and to provide a performance testing apparatus for a pulsation attenuator.

In order to achieve the purpose, the technical scheme adopted by the invention is as follows:

the utility model provides a pulsation attenuator capability test device, includes the support, its characterized in that: the bracket is sequentially communicated with a liquid pressure pulsation generating system, a hydrostatic pressure loading system and an oil recycling system in a closed loop manner through pipelines;

the liquid pressure pulsation generating system comprises a pulsation generating assembly 1, a first pipe 2 and a first pressure sensor 5; wherein the pulsation generating assembly 1 consists of: the device comprises a pump 1-1, a pipe II 1-2, a PLC control system 1-3 and an electromagnetic valve 1-4, wherein the inlet of the pump 1-1 and the inlet of the electromagnetic valve 1-4 are hermetically connected through the pipe II 1-2, one end of the pipe I2 is communicated with a pulsation generating assembly 1, the other end of the pipe I2 is hermetically connected with the inlet of a pulsation attenuator 7 to be detected, a first pressure sensor 5 is arranged on the pipe I2 close to the inlet of the pulsation attenuator 7 to be detected, and a collecting end extends into the pipe I2; the hydrostatic pressure loading system comprises a second pressure sensor 9, a third pipe 10, an energy accumulator 13 and a throttle valve 14, one end of the third pipe 10 is hermetically connected with an outlet of the pulsation attenuator 7 to be detected, the other end of the third pipe is hermetically connected with the throttle valve 14, the second pressure sensor 9 is arranged on the third pipe 10 close to the outlet of the pulsation attenuator 7 to be detected, a collecting end extends into the third pipe 10, the central axes of the first pipe 2 and the third pipe 10 are at the same horizontal height, the energy accumulator 13 is arranged on the third pipe 10, and a liquid inlet is communicated with the third pipe 10; the oil recycling system comprises a pipe four 15, a hose 17, an oil tank 18 and an oil pipe 21, wherein the pipe four 15 is hermetically connected with the throttle valve 14, the pipe four 15 is connected with the hose 17 through a screw thread 16, the hose 17 extends into the oil tank 18, and the oil tank 18 is connected with the pump 1-1 through the oil pipe 21 to form a closed-loop system.

Furthermore, the first pipe 2 is formed by hermetically connecting two branch pipes I2-1 and II 2-2 which have the same diameter and different lengths through a first flange 3; the third pipe 10 is formed by hermetically connecting two branch pipes III 10-1 and IV 10-2 which have the same diameter and different lengths through second flanges 11.

Further, the pulsation attenuator performance test device further includes: a first electromagnetic flow meter 4 and a second electromagnetic flow meter 12; the first electromagnetic flow meter 4 is arranged on the first pipe 2 and is used for measuring the flow rate when the water flows into the pulsation attenuator 7 to be measured; the second electromagnetic flowmeter 12 is arranged on the third pipe 10 and used for measuring the flow rate when the pulsation attenuator 7 to be measured flows out.

Further, the pulsation attenuator performance test device further includes: a first adapter tube 6 and a second adapter tube 8; the first adapter tube 6 is arranged between the first tube 2 and the pulsation attenuator 7, one end of the first adapter tube is hermetically connected with the first tube 2, and the other end of the first adapter tube is hermetically connected with an inlet of the pulsation attenuator 7 to be measured; the second adapter tube 8 is arranged between the pulsation attenuator 7 to be tested and the tube III 10, one end of the second adapter tube is hermetically connected with the outlet of the pulsation attenuator 7 to be tested, and the other end of the second adapter tube is hermetically connected with the tube III 10.

A testing method of a pulsation attenuator performance testing device comprises the following steps:

s1: the inlet of the pulsation attenuator 7 to be measured is hermetically connected with the first pipe 2, and the outlet of the pulsation attenuator is hermetically connected with the third pipe 10;

s2: injecting oil into the oil tank 18 through an oil plug 19, and injecting the oil into a pipeline by the oil pump 1-1;

s3: the hydrostatic pressure in the pipeline is regulated by the accumulator 13 and the throttle valve 14;

s4: the pulsation generating assembly 1 generates liquid pulsation to oil;

s5: the first pressure sensor 5 acquires the inlet pressure P1 of the pulsation attenuator 7 to be measured;

s6: the second pressure sensor 9 collects the outlet pressure P2 of the pulsation attenuator 7 to be measured;

s7: according to the formula

Calculating, wherein when L is larger than 0, the pulsation attenuator can reduce the generated pulsation, otherwise, the effect is not achieved; the larger L, the better the performance of the pulsation attenuator.

Further, the specific method for adjusting the hydrostatic pressure in the pipeline through the accumulator 13 and the throttle valve 14 in S3 is as follows: the pressure in the pipeline is adjusted by adjusting the flow of the pipeline through a throttle valve 14, and the static pressure is adjusted and maintained through an accumulator 13.

Further, the specific method for generating the liquid pulsation by the pulsation generating assembly in S4 is as follows: the PLC control system 1-3 controls the flow of oil liquid by controlling the opening and closing of the electromagnetic valve 1-4, so that the oil liquid generates pulsation, the opening and closing times of the electromagnetic valve 1-4 are set in the PLC control system 1-3, so that the oil liquid generates different pulsation frequencies, and the range of the achievable pulsation frequencies is 5Hz to 600 Hz.

Compared with the prior art, the invention has the advantages and beneficial effects that:

in the invention, the PLC control system controls the opening and closing of the electromagnetic valve to enable the oil to generate pulsation, and the attenuation performance of the attenuator is calculated according to the pressure collected by the pressure sensors at the two sides of the pulsation attenuator to be measured, so that the technical effects of small occupied area and high measurement precision of the device are obtained.

In the invention, the static pressure is applied and adjusted to the hydraulic system through the energy accumulator and the throttle valve, the operation is simple, and the stability of applying the static pressure is improved, thereby improving the measurement precision.

In the invention, the PLC control system is provided with the times of opening and closing the electromagnetic valve, so that the liquid can generate 5-600Hz of pulse frequency, the applicability of the testing device is improved, and the operation is simple.

In the invention, the adapter tube is adopted to install the pulsation attenuator to be tested into the measuring device, and the pulsation attenuator to be tested with different sizes can be tested by replacing adapter tubes with different calibers and pulsation generation branch tubes and hydrostatic pressure branch tubes with different lengths.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a schematic view of a flange of the present invention.

Fig. 3 is a schematic view of an adapter according to the present invention.

FIG. 4 is an enlarged view of the thread connecting the tube and the hose of the present invention.

Fig. 5 is an enlarged view of the connection of the pipe and the bracket in the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

As shown in fig. 1 to 5, a pulsation attenuator performance testing device comprises a support, and a hydraulic pressure pulsation generating system, a hydrostatic pressure loading system and an oil recycling system which are sequentially communicated in a closed loop manner on the support through a pipeline. The liquid pressure pulsation generating system comprises a pulsation generating assembly 1, a first pipe 2 and a first pressure sensor 5, wherein the pulsation generating assembly 1 consists of a pump 1-1, a second pipe 1-2, a PLC control system 1-3 and an electromagnetic valve 1-4, the inlet of the pump 1-1 and the inlet of the electromagnetic valve 1-4 are hermetically connected through the second pipe 1-2, one end of the first pipe 2 is communicated with the pulsation generating assembly 1, the other end of the first pipe is hermetically connected with the inlet of a pulsation attenuator 7 to be detected, the first pressure sensor 5 is arranged on the first pipe 2 close to the inlet of the pulsation attenuator 7 to be detected, and the acquisition end extends into the first pipe 2; the hydrostatic pressure loading system comprises a second pressure sensor 9, a third pipe 10, an energy accumulator 13 and a throttle valve 14, one end of the third pipe 10 is hermetically connected with an outlet of the pulsation attenuator 7 to be detected, the other end of the third pipe is hermetically connected with the throttle valve 14, the second pressure sensor 9 is arranged on the third pipe 10 close to the outlet of the pulsation attenuator 7 to be detected, a collecting end extends into the third pipe 10, the energy accumulator 13 is arranged on the third pipe 10, and a liquid inlet is communicated with the third pipe 10; the central axes of the first pipe 2 and the third pipe 10 are at the same horizontal height; the oil recycling system comprises a pipe four 15, a hose 17, a fuel tank 18 and an oil pipe 21, wherein the pipe four 15 is hermetically connected with the throttle valve 14, the pipe four 15 is connected with the hose 17 by a screw thread 16 (shown in figure 4), the hose 17 extends into the fuel tank 18, and the fuel tank 18 is connected with the pump 1-1 through the oil pipe 21 to form a closed-loop system.

In the embodiment, the oil pump 1-1 selects a 220V gear oil pump; the PLC control system 1-3 is a small-sized machine PLC, and the function of the PLC control system is mainly to control a switch; the electromagnetic valves 1-4 are SMC high-frequency electromagnetic valves; the energy accumulator 13 is a spring type energy accumulator, and has simple structure and sensitive reaction; the throttle valve 14 is a straight-through type shutoff throttle valve.

When the device is used, the inlet of the pulsation attenuator 7 to be tested is hermetically connected with the first pipe 2, and the outlet of the pulsation attenuator 7 to be tested is hermetically connected with the third pipe 10. The pressure in the pipeline is adjusted by adjusting the flow of the pipeline through the throttling valve 14, and the hydrostatic pressure in the pipeline is adjusted and maintained through the accumulator 13 and the throttling valve 14. After the static pressure is set, the opening and closing of the electromagnetic valves 1-4 are controlled through the PLC control system 1-3, and therefore the hydraulic oil in the pipe is pulsed. The PLC control system 1-3 is provided with the times of opening and closing the electromagnetic valves 1-4 to enable the oil liquid to generate different pulse frequencies so as to adapt to different vibration experimental occasions. After the liquid pulsation is generated, the first pressure sensor 5 acquires the hydraulic pressure at the inlet of the pulsation attenuator 7 to be measured, and the second pressure sensor 9 acquires the hydraulic pressure at the outlet of the pulsation attenuator 7 to be measured, so that the attenuation performance of the pulsation attenuator 7 to be measured can be obtained according to the front and back pressures.

The device is suitable for measuring small-sized pulsation attenuators. Because the inlet and outlet apertures of different pulsation attenuators 7 to be tested are different, in order to improve the overall compatibility of the device, a first adapter tube 6 and a second adapter tube 8 are added (as shown in fig. 3); the first adapter tube 6 is arranged between the first tube 2 and the pulsation attenuator 7 to be tested, one end of the first adapter tube is hermetically connected with the first tube 2, and the other end of the first adapter tube is hermetically connected with an inlet of the pulsation attenuator 7 to be tested; the second adapter tube 8 is arranged between the pulsation attenuator 7 to be tested and the tube III 10, one end of the second adapter tube is hermetically connected with the outlet of the pulsation attenuator 7 to be tested, and the other end of the second adapter tube is hermetically connected with the tube III 10. One caliber of the first adapter tube 6 is the same as that of the first tube 2, and the other caliber of the first adapter tube is the same as that of an inlet of the pulsation attenuator 7 to be measured; one caliber of the second adapter tube 8 is the same as the caliber of the outlet of the pulsation attenuator 7 to be measured, and the other caliber is the same as the caliber of the third tube 10; through the switching of the first switching tube 6 and the second switching tube 8, the pulsation attenuator 7 to be measured with different calibers can be butted with the device. When the pulsation attenuator 7 to be tested with different calibers is tested, the pulsation attenuator 7 to be tested can be connected into the device of the invention only by selecting the first adapter tube 6 and the second adapter tube 8 which are adaptive to each other, the whole device does not need to be redesigned, and the compatibility of the device is improved.

Meanwhile, considering that the pulsation attenuators 7 to be tested with different sizes are connected, the distance between the first pipe 2 and the third pipe 10 cannot be fixed, and the pulsation attenuators 7 to be tested with different sizes can be connected only by replacing the branch pipes I2-1, II 2-2, III 10-1 and IV 10-2 with different sizes.

The invention provides a performance test method of a pulsation attenuator, which comprises the following steps:

s1: the inlet of the pulsation attenuator 7 to be measured is hermetically connected with the first pipe 2, and the outlet of the pulsation attenuator is hermetically connected with the third pipe 10;

s2: injecting oil into the oil tank 18 through an oil plug 19, and injecting the oil into a pipeline by the oil pump 1-1;

s3: the hydrostatic pressure in the pipeline is regulated by the accumulator 13 and the throttle valve 14;

s4: the pulsation generating assembly 1 generates liquid pulsation to oil;

s5: the first pressure sensor 5 acquires the inlet pressure P1 of the pulsation attenuator 7 to be measured;

s6: the second pressure sensor 9 collects the outlet pressure P2 of the pulsation attenuator 7 to be measured;

s7: according to the formula

Calculating, when L is larger than 0, thenThe pulsation attenuator can reduce the generated pulsation, otherwise, the effect is not achieved; the larger L, the better the ripple attenuator performance.

Before testing, the inlet of the pulsation attenuator 7 to be tested is hermetically connected with the first pipe 2, and the outlet of the pulsation attenuator is hermetically connected with the third pipe 10, or the pulsation attenuator can be connected into the testing device through the first adapter pipe 6 and the second adapter pipe 8. After the attachment is completed, a proper amount of hydraulic oil needs to be injected into the oil tank 18 of the testing device of the present invention through the oil plug 19. The pressure in the pipeline is adjusted by adjusting the flow of the pipeline through a throttle valve 14, and the static pressure is adjusted and maintained through an accumulator 13. After the static pressure setting is finished, oil is filled into the pipeline by the oil pump 1-1, and the PLC control system 1-3 controls the opening and closing of the electromagnetic valve 1-4 to enable the oil to generate pulsation. The frequency of the pulsation is realized by setting the opening and closing times of the electromagnetic valve 1-4 on the PLC control system 1-3. The frequency of the oil pulsation can be adjusted between 5Hz and 600 Hz.

The foregoing is only a preferred embodiment of the present invention. The present invention is capable of other embodiments, and various changes and modifications can be made by one skilled in the art without departing from the spirit and scope of the invention. All technical solutions which are formed by adopting equivalent substitutions or equivalent transformations shall fall within the protection scope of the appended claims.