CN102338074B - Sealing type test device and method applicable to various types of oil pumps - Google Patents
Sealing type test device and method applicable to various types of oil pumps Download PDFInfo
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- CN102338074B CN102338074B CN 201010235197 CN201010235197A CN102338074B CN 102338074 B CN102338074 B CN 102338074B CN 201010235197 CN201010235197 CN 201010235197 CN 201010235197 A CN201010235197 A CN 201010235197A CN 102338074 B CN102338074 B CN 102338074B
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Abstract
The invention relates to a test device and a method for various types of oil pumps, and particularly discloses a sealing type test device and a method applicable to various types of oil pumps. The test method concretely comprises the following steps of: (1) setting the step length of the initial value of the inlet pressure value Gs of the oil pumps to be tested and the gradual decrease Gs value according to the oil pump work points; (2) setting the upper and lower limit values of each step Gs through a visual interface of the monitoring software in a host computer; (3) setting the upper and lower limit values of the test media temperature T through the visual interface of the monitoring software in the host computer; (4) obtaining a net positive suction head calculation formula through deduction and simplification; and (5) gradually decreasing the Gs value according to the step length and finely regulating a throttle valve to enable the oil pump full pressure to be stabilized to the test point pressure value. The test device and the method have the advantages that the sealed space pressure regulation range is large, the pressure of the sealed space can be fast, stably and highly reliably regulated, in addition, the environment is protected, and the tested data are accurate.
Description
Technical field
The present invention relates to testing apparatus and the method for all types of pumps, be specifically related to a kind of blocking test device and method that is applicable to all types of oil pumps
Background technique
Liquid at a certain temperature, when reducing the pressure for vaporization of pressure to this temperature, liquid just produces bubble, this phenomenon is called cavitation.When the bubble that produces when cavitation takes place flow to the high pressure place, its volume reduces so that vanish, the destruction that high frequency that cavitation produces bubble when breaking with bubble and the impact dynamics that has can cause lubricating pump overcurrent original paper, even fracture, therefore in oil pump is produced, need a kind of test method and device that oil pump is carried out cavitation and performance test, the validity of test data directly influences correct use and the using effect of oil pump, particularly cavitation performance is to there being significant impact in working life of oil pump, if the net positive suction head data of oil pump are inaccurate, the rupture failure that can cause the overcurrent component by the oil pump installation parameter of its design, make gear, the lubricated cooling of lubricating points such as bearing burst is interrupted, and causes heavy losses for equipment and production.
At present, most of factories adopt the open type testing apparatus of seeing table, timing, volume weight method metering reduced discharge, the inlet pressure of oil pump realizes by aperture or increase and decrease liquid level height that manual tune reduces inlet shutoff valve, has problems such as the pressure regulation range is little, governing speed is slow, equipment is huge.The mechanical structure characteristics of pump determine delivery pressure and the flow of pump all to pulse, this pulsation also can cause the fluctuation of oil pump inlet pressure, these two kinds of regulating methods all can not be real-time, accurately inlet pressure is adjusted, therefore, there is bigger error in the oil pump measured value of pressure and flow everywhere, the error of test data that obtains thus also is bigger naturally, want the numerical value of substep downward modulation oil pump inlet pressure gradually during as the oil pump cavitation experiment, all require the inlet pressure value of this step setting invariable in the process of the test in each step, the accuracy in computation of net positive suction head depends primarily on the validity of inlet pressure measured value, the factor that influences this value is more, by manually can't accurately adjusting.The open type testing installation is except extraneous factor has certain influence test data, and the medium that leaks during test also produces bigger pollution to environment.
Summary of the invention
The object of the present invention is to provide a kind of pressure regulation range big, can regulate the oil pump inlet pressure rapidly, inlet pressure is stabilized in the setting range, and carry out method and the device of oil pump blocking test.
Technological scheme of the present invention is as follows: a kind of blocking test method that is applicable to all types of oil pumps, this method comprise that treating the formation testing pump carries out cavitation experiment, or make a service test, and comprise following committed step when carrying out cavitation experiment:
Step 1, according to the oil pump operation point, set and to treat formation testing pump inlet pressure value G
sInitial value and reduce the step-length of Gs value gradually;
Step 2, by the visual interface of monitoring software in the host computer set each the step G
sUpper limit value and lower limit value;
Treat formation testing pump inlet pressure value G by computer controlled system
sCarry out real-time automatic measuring and controlling, when inlet pressure value during greater than CLV ceiling limit value, extracted out the gas of closed oil tank liquid level top by the vacuum accumulator device, make the gaseous pressure in the closed oil tank obtain rapidly adjusting, make the formation testing pump inlet pressure value for the treatment of that links to each other with closed oil tank return to setting value, at this moment, finish to extract the gas of closed oil tank liquid level top; When force value during less than lower limit, pressurized air fills in the closed oil tank, when making the inlet pressure value for the treatment of the formation testing pump return to setting value, stops closed oil tank being inflated;
Step 3, set the upper limit value and lower limit value of test(ing) medium temperature T by the visual interface of monitoring software in the host computer;
By computer controlled system test medium temperature T value in the closed oil tank is carried out real-time automatic measuring and controlling, when fluid temperature was lower than the lower limit of T, computer controlled system started heater to liquid warming, makes it reach setting value; When fluid temperature is higher than the CLV ceiling limit value of T, start cooler liquid is lowered the temperature, make it be down to setting value;
Before step 4, the test test(ing) medium temperature is controlled a fixed value, is measured the Media density ρ of this temperature correspondence, obtain the net positive suction head formula through derivation and simplification:
NPSH＝[G
s/(ρ*g)]+Z
s*10
-6+[8*Q
i 2/(π
2*D
s 4*g)]*10
-6+[(P
b/(ρ*g)]-[P
v/(ρ*g)]
In the formula, G
sBe the oil pump inlet pressure; ρ is Media density; Z
sFor pressure-measuring point to the basal plane height; Q
iBe measured discharge; P
bBe atmospheric pressure; P
vBe pressure for vaporization; D
sBe the Check point latus rectum;
Following formula enrolls in the program of host computer in advance, and TT﹠C system calculates relevant real-time measurement values input following formula automatically net positive suction head NPSH value, and draws out curve during cavitation experiment;
After the adjusting throttle valve makes pressure, the flow of oil pump reach the numerical value of test point requirement before step 5, the cavitation experiment, progressively reduce G by above-mentioned step-length
sValue, and the fine setting throttle valve makes the oil pump total pressure be stabilized in the test point force value; To each G
sThe value computer is all calculated corresponding net positive suction head NPSH value, off-test when the NPSH value equals critical NPSH automatically.
A kind of blocking test device that is applicable to all types of oil pumps, this device comprises a closed oil tank, the lower end of closed oil tank is connected with treating formation testing pump intake end by inlet shutoff valve, treat that formation testing delivery side of pump end divides two-way, the relief valve of leading up to is connected with the upper end of closed oil tank, flow transmitter is passed through on another road successively, throttle valve is connected with the upper end of closed oil tank, be connected inlet pressure transmitter and outlet pressure transmitter respectively at the entry end for the treatment of the formation testing pump and outlet end, top at closed oil tank is provided with level meter, treat that the formation testing pump links to each other with motor simultaneously, it is characterized in that: vacuum pump passes through one-way valve, pneumatic ball valve is connected with the upper end of closed oil tank, wherein, the vacuum accumulator device is connected on the pipeline between one-way valve and the pneumatic ball valve, and source of compressed air also links to each other with closed oil tank.
Described vacuum accumulator device links to each other with the vacuum pressure controller simultaneously, the capacity of vacuum accumulator device can reserve sufficient adjusting surplus according to the volume of closed oil tank top gas-phase space, can rapidly, stably regulate the pressure in the closed oil tank, also can effectively prevent the frequent starting of vacuum pump.
Described source of compressed air is the upper end that is connected to closed oil tank by vacuum filter and solenoid valve A.
Described closed oil tank is provided with temperature transmitter and heater, also is connected with cooler between throttle valve and closed oil tank, and the solenoid valve C of control flow of cooling water is installed on the chilled(cooling) water return (CWR) of cooler.
Described pneumatic ball valve is connected with solenoid valve B simultaneously.
Between described vacuum accumulator device and the closed oil tank pneumatic ball valve that available computers is controlled open and close automatically is housed, available computers is housed between closed oil tank and the source of compressed air controls the pressure auto-control mechanism that the solenoid valve A of open and close forms automatically.
Remarkable result of the present invention is: (1) the present invention utilizes the negative pressure that stores in the positive pressure of source of compressed air and the vacuum accumulator device, can make pressure in the enclosed space adjust to the minimal negative pressure value of approaching-0.1MPa from any positive pressure value, can realize the bigger adjusting of enclosed space pressure range; (2) according to the enough volume of big vacuum accumulator device of the size Selection of air phase volume in the closed oil tank, can be rapidly, stable, regulate pressure in the enclosed space highly reliably, also can avoid the vacuum pump frequent starting; (3) the present invention adopts Computer Control Technology to make to have the pressure regulator of vacuum accumulator device to have function according to the automatic real-time monitoring oil pump of the variation of each relevant parameter inlet pressure value, makes and measures and the test data true and accurate.(4) the closed system design can be got rid of the error that bring test data in the external interference source, and environmental protection does not simultaneously produce environment and pollutes.
Description of drawings
Fig. 1 is the blocking test device schematic representation that is applicable to all types of oil pumps;
Among the figure: 1, vacuum accumulator device; 2, one-way valve; 3, vacuum pump; 4, vacuum pressure controller; 5, solenoid valve A; 6, vacuum filter; 7, source of compressed air; 8, outlet pressure transmitter; 9, flow transmitter; 10, treat the formation testing pump; 11, throttle valve; 12, motor; 13, inlet pressure transmitter; 14, inlet shutoff valve; 15, level meter; 16, closed oil tank; 17, relief valve; 18, solenoid valve B; 19, pneumatic ball valve; 20, solenoid valve C; 21, cooler; 22, heater; 23, temperature transmitter.
Embodiment
Below in conjunction with accompanying drawing the present invention is described in further detail.
A kind of blocking test method that is applicable to all types of oil pumps, this method comprise that treating the formation testing pump carries out cavitation experiment, or make a service test, and when treating the formation testing pump and carry out cavitation experiment, its concrete steps are:
Step 1, according to the oil pump operation point, set and to treat formation testing pump inlet pressure value G
sInitial value and reduce the step-length of Gs value gradually;
Step 2, by the visual interface of monitoring software in the host computer set each the step G
sUpper limit value and lower limit value;
Treat formation testing pump inlet pressure value G by computer controlled system
sCarry out real-time automatic measuring and controlling, when inlet pressure value during greater than CLV ceiling limit value, extracted out the gas of closed oil tank liquid level top by the vacuum accumulator device, make the gaseous pressure in the closed oil tank obtain rapidly adjusting, make the formation testing pump inlet pressure value for the treatment of that links to each other with closed oil tank return to setting value, at this moment, finish to extract the gas of closed oil tank liquid level top; When force value during less than lower limit, pressurized air fills in the closed oil tank, when making the inlet pressure value for the treatment of the formation testing pump return to setting value, stops closed oil tank being inflated;
Step 3, set the upper limit value and lower limit value of test(ing) medium temperature T by the visual interface of monitoring software in the host computer;
By computer controlled system test medium temperature T value in the closed oil tank is carried out real-time automatic measuring and controlling, when fluid temperature was lower than the lower limit of T, computer controlled system started heater to liquid warming, makes it reach setting value; When fluid temperature is higher than the CLV ceiling limit value of T, start cooler liquid is lowered the temperature, make it be down to setting value.
Step 4, with test(ing) medium temperature control a fixed value, measure the Media density ρ of this temperature correspondence, through deriving and simplification obtains the net positive suction head formula:
NPSH＝[G
s/(ρ*g)]+Z
s*10
-6+[8*Q
i 2/(π
2*D
s 4*g)]*10
-6+[(P
b/(ρ*g)]-[P
v/(ρ*g)]
In the formula, G
sBe the oil pump inlet pressure; ρ is Media density; Z
sFor pressure-measuring point to the basal plane height; Q
iBe measured discharge; P
bBe atmospheric pressure; P
vBe pressure for vaporization; D
sBe the Check point latus rectum.
Following formula enrolls in the program of host computer in advance, and TT﹠C system calculates relevant real-time measurement values input following formula automatically net positive suction head NPSH value, and draws out curve during cavitation experiment.
After adjusting throttle valve 11 makes pressure, the flow of oil pump reach the numerical value of test point requirement before step 5, the cavitation experiment, progressively reduce G by above-mentioned step-length
sValue, and fine setting throttle valve 11 makes the oil pump total pressure be stabilized in the test point force value.To each G
sThe value computer is all calculated corresponding net positive suction head NPSH value, off-test when the NPSH value equals critical NPSH automatically.
As shown in Figure 1, the blocking test device that is applicable to all types of oil pumps of the present invention, comprise a closed oil tank 16, the lower end of closed oil tank 16 is connected with treating formation testing pump 10 entrances by inlet shutoff valve 14, the outlet end for the treatment of formation testing pump 10 divides two-way, the relief valve 17 of leading up to is connected with the upper end of closed oil tank 16, another road is successively by flow transmitter 9, throttle valve 11, cooler 21 is connected with the upper end of closed oil tank 16, constitute a loop, wherein, treat that formation testing pump 10 also is connected with motor 12 simultaneously, be connected inlet pressure transmitter 13 and outlet pressure transmitter 8 respectively at the entry end for the treatment of formation testing pump 10 and outlet end, the solenoid valve C20 of control flow of cooling water is installed on the chilled(cooling) water return (CWR) of cooler 21; Vacuum pump 3 is connected with the upper end of closed oil tank 16 by one-way valve 2, pneumatic ball valve 19, wherein, vacuum accumulator device 1 is connected on the pipeline between one-way valve 2 and the pneumatic ball valve 19, and vacuum accumulator device 1 links to each other with vacuum pressure controller 4 simultaneously, and solenoid valve B18 is connected with pneumatic ball valve 19; Source of compressed air 7 is connected between pneumatic ball valve 19 and the closed oil tank 16 by vacuum filter 6 and solenoid valve A5; Closed oil tank 16 also is equipped with level meter 15, temperature transmitter 23 and heater 22.
Above-mentioned relief valve 17 damages the component of system when being used for preventing oil circuit pressure superelevation; Level meter 15 can be determined the height of liquid level in the closed oil tank 16.
Above-mentioned vacuum pump 3 is used for extracting out the air of vacuum accumulator device 1, make it keep enough little negative pressure value, the numerical value of negative pressure is to be set arbitrarily according to the requirement of various oil pump tests by vacuum pressure controller 4, and the opening and closing of control vacuum pump 3, the pressure of vacuum accumulator device 1 is remained in the scope of setting value; The capacity of vacuum accumulator device 1 can reserve sufficient adjusting surplus according to the volume of closed oil tank 16 top gas-phase spaces, can effectively prevent vacuum pump 3 frequent startings, causes motor overheating; When one-way valve 2 can prevent that vacuum pump 3 from quitting work, ambient atmosphere was poured in down a chimney in the vacuum accumulator device 1.
The adjusting of above-mentioned throttle valve 11 can change the flow measurements of flow transmitter 9 and the pressure measuring value of outlet pressure transmitter 8, can obtain to test required data.
Above-mentioned motor 12 drives treats that the rotor of formation testing pump 10 rotates, liquid in the closed oil tank 16 is treated formation testing pump 10 by inlet shutoff valve 14 suctions, through flow transmitter 9 and throttle valve 11 liquid is entered in the closed oil tank 16, liquid is circulated in locking system.When in the locking system during pressure superelevation, relief valve 17 is opened the liquid for the treatment of 10 outputs of formation testing pump and is directly flow back in the closed oil tank 16; Cooling water flow supercooler 21 can reduce the temperature of liquid in the systemic circulation, and heater 22 can improve the temperature of liquid in the systemic circulation.
Available computers is housed between above-mentioned vacuum accumulator device 1 and the closed oil tank 16 controls the pneumatic ball valve 19 of open and close automatically, available computers is housed between closed oil tank 16 and the source of compressed air 7 controls the pressure auto-control mechanism that the solenoid valve A5 of open and close forms automatically, can utilize the negative pressure that stores in the vacuum accumulator device 1 to reduce pressure in the enclosed space; The positive pressure that provides with source of compressed air 7 increases the pressure in the enclosed space.
Claims (7)
1. blocking test method that is applicable to all types of oil pumps, this method comprises that treating the formation testing pump carries out cavitation experiment, is characterized in that: comprise following committed step when carrying out cavitation experiment:
Step 1, according to the oil pump operation point, set and to treat formation testing pump inlet pressure value G
sInitial value and reduce G gradually
sThe step-length of value;
Step 2, by the visual interface of monitoring software in the host computer set each the step G
sUpper limit value and lower limit value;
Treat formation testing pump inlet pressure value G by computer controlled system
sCarry out real-time automatic measuring and controlling, when inlet pressure value during greater than CLV ceiling limit value, extracted out the gas of closed oil tank liquid level top by the vacuum accumulator device, make the gaseous pressure in the closed oil tank obtain rapidly adjusting, make the formation testing pump inlet pressure value for the treatment of that links to each other with closed oil tank return to setting value, at this moment, finish to extract the gas of closed oil tank liquid level top; When force value during less than lower limit, pressurized air fills in the closed oil tank, when making the inlet pressure value for the treatment of the formation testing pump return to setting value, stops closed oil tank being inflated;
Step 3, set the upper limit value and lower limit value of test(ing) medium temperature T by the visual interface of monitoring software in the host computer;
By computer controlled system test medium temperature T value in the closed oil tank is carried out real-time automatic measuring and controlling, when fluid temperature was lower than the lower limit of T, computer controlled system started heater to liquid warming, makes it reach setting value; When fluid temperature is higher than the CLV ceiling limit value of T, start cooler liquid is lowered the temperature, make it be down to setting value;
Before step 4, the test test(ing) medium temperature is controlled a fixed value, is measured the Media density ρ of this temperature correspondence, obtain the net positive suction head formula through derivation and simplification:
NPSH=[G
s/(ρ*g)]+Z
s*10
-6+[8*Q
i 2/(π
2*D
s 4*g)]*10
-6+[(P
b/(ρ*g)]-[P
v/(ρ*g)]
In the formula, G
sBe the oil pump inlet pressure; ρ is Media density; Z
sFor pressure-measuring point to the basal plane height; Q
iBe measured discharge; P
bBe atmospheric pressure; P
vBe pressure for vaporization; D
sBe the Check point latus rectum;
Following formula enrolls in the program of host computer in advance, and TT﹠C system calculates relevant real-time measurement values input following formula automatically net positive suction head NPSH value, and draws out curve during cavitation experiment;
After the adjusting throttle valve makes pressure, the flow of oil pump reach the numerical value of test point requirement before step 5, the cavitation experiment, progressively reduce G by above-mentioned step-length
sValue, and the fine setting throttle valve makes the oil pump total pressure be stabilized in the test point force value; To each G
sThe value computer is all calculated corresponding net positive suction head NPSH value, off-test when the NPSH value equals critical NPSH automatically.
2. blocking test device that is applicable to all types of oil pumps, this device comprises a closed oil tank (16), the lower end of closed oil tank (16) is connected with treating formation testing pump (10) entry end by inlet shutoff valve (14), the outlet end for the treatment of formation testing pump (10) divides two-way, the relief valve (17) of leading up to is connected with the upper end of closed oil tank (16), another road is successively by flow transmitter (9), throttle valve (11) is connected with the upper end of closed oil tank (16), be connected inlet pressure transmitter (13) and outlet pressure transmitter (8) respectively at the entry end for the treatment of formation testing pump (10) and outlet end, be provided with level meter (15) on the top of closed oil tank (16), treat that formation testing pump (10) links to each other with motor (12) simultaneously, it is characterized in that: vacuum pump (3) is by one-way valve (2), pneumatic ball valve (19) is connected with the upper end of closed oil tank (16), wherein, vacuum accumulator device (1) is connected on the pipeline between one-way valve (2) and the pneumatic ball valve (19), and source of compressed air (7) also links to each other with closed oil tank (16).
3. a kind of blocking test device that is applicable to all types of oil pumps according to claim 2, it is characterized in that: described vacuum accumulator device (1) links to each other with vacuum pressure controller (4) simultaneously, the capacity of vacuum accumulator device (1) reserves sufficient adjusting surplus according to the volume of closed oil tank (16) top gas-phase space, the pressure in the closed oil tank (16) can be rapidly, stably regulated, also the frequent starting of vacuum pump (3) can be effectively prevented.
4. a kind of blocking test device that is applicable to all types of oil pumps according to claim 2, it is characterized in that: described source of compressed air (7) is by vacuum filter (6) and solenoid valve A(5) be connected to the upper end of closed oil tank (16).
5. a kind of blocking test device that is applicable to all types of oil pumps according to claim 2, it is characterized in that: described closed oil tank (16) is provided with temperature transmitter (23) and heater (22), between throttle valve (11) and closed oil tank (16), also be connected with cooler (21), the solenoid valve C(20 of control flow of cooling water is installed on the chilled(cooling) water return (CWR) of cooler (21)).
6. a kind of blocking test device that is applicable to all types of oil pumps according to claim 2 is characterized in that: described pneumatic ball valve (19) while and solenoid valve B(18) be connected.
7. a kind of blocking test device that is applicable to all types of oil pumps according to claim 2, it is characterized in that: between described vacuum accumulator device (1) and the closed oil tank (16) available computers is housed and controls the pneumatic ball valve of open and close (19) automatically, between closed oil tank (16) and the source of compressed air (7) the solenoid valve A(5 that available computers is controlled open and close automatically is housed) the pressure auto-control mechanism that forms.
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|---|---|---|---|
| CN 201010235197 CN102338074B (en) | 2010-07-23 | 2010-07-23 | Sealing type test device and method applicable to various types of oil pumps |
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|---|---|---|---|
| CN 201010235197 CN102338074B (en) | 2010-07-23 | 2010-07-23 | Sealing type test device and method applicable to various types of oil pumps |
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| CN102338074B true CN102338074B (en) | 2013-07-17 |
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| CN102338074A (en) | 2012-02-01 |
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