CN2251715Y - Hydraulic flowmeter on-line checking device - Google Patents

Abstract

The utility model relates to a hydraulic flowmeter on-line checking device, which is matched with advanced methods such as frequency measurement, timing, weighting, etc. The measurement overall process of the utility model is controlled by an industrial control microcomputer STD. The pulse frequency generated by a scaling flowmeter 1 is mixed and imported into an STD main circuit by a counting plate of a single chip computer, temperature scales measured by a temperature measuring point T are imported into the STD main circuit via a digital temperature measurement control device 6 and a digital input plate I/O, and weights measured by an electronic balance PT arranged under a weighting oil tank are imported into the STD main circuit via a displayer 5 of the electronic balance and the digital input plate I/O. Timing can be achieved by a time measurement plate via the STD main circuit, a stream limiter 4 is arranged on an inlet where oil liquid flows into the oil tank, and steady flow processing for liquid impact can be achieved by the stream limiter.

Description

Hydraulic flow meter on-line testing device

The utility model relates to a kind of calibration equipment of hydraulic flow meter.

At present, hydraulic flow meter method of calibration commonly used has volumetric method and quality weighing method, the quality weighing method can be divided into static weighing method and Dynamic Weighting method again according to measuring principle, the static weighing method is in the elapsed time of regulation, respectively static state claim tare weight and gross weight, calculate the fluid mass of collecting, this method will have the break-make of commutator control fluid, its characteristics are the accuracy height, allow with pin-point accuracy and weighing equipment (can reach 100,000/), fluid commutator is a flow distributor, it utilizes air pressure control shunting plate washer to realize the fluid shunting, be difficult to be transferred to equal the two-way time of commutator, therefore is easy to generate systematic error, and the realization on-line testing is had any problem.The Dynamic Weighting method is that fluid flows directly into container, open, stop realizing timing by the Weight control timer in the actual measurement range of weighing of regulation, its key is the transformation period of control of quality (weight) increment effectively, this method is quick and convenient, the Measuring Time of weighing can be shortened, especially very high accuracy and repdocutbility can be obtained during low speed.For example, U.S. Pat 4502318 discloses a kind of " meter proving method and device, ", and this device comprises: a Weighing system is to adopt mechanical scale that the flow that flows through the measured flux meter is carried out Dynamic Weighting; The supervisory system of a flowmeter calibration; Base when this device timing partly adopts ball screw and stepper motor to segment, screw mandrel backlass and rotor inertia are all with the drawing-in system error.This device does not have the frequency measurement means, only comes the calculated mass flow with the weight gain of unit interval.This device contains time weight scale control and timing circuit.But, can produce certain impulsive force when falling into measuring container owing to fluid, flow velocity is big more, and its impulsive force is big more, and the error of generation is also big more, and this device does not have current stabilization and shock counter measure yet.

The purpose of this utility model is to obtain a kind of hydraulic flow meter on-line testing device, in conjunction with advanced weigh, means such as timing, frequency measurement, but and voltage stabilizing is carried out in the impact of convection cell, protecting against shock is handled, the accuracy of measurement is improved.

The purpose of this utility model is achieved in that

A kind of hydraulic flow meter on-line testing device, it comprises: by industrial computer STD control survey overall process, imported STD bus from the B point through the single-chip microcomputer tally by the pulsed frequency that proving flowmeter 1 produces, fluid flows into weighing fuel tank 3 from oil-in I through point for measuring temperature T, the temperature value that point for measuring temperature T measures from the C point through digital temperature measurement and control instrument 6, numeral tablet I/O input STD bus, the following of weighing fuel tank is electronic scales PT, the gravimetric value of measuring from the A point through electronic scales display instrument 5, numeral tablet I/O input STD bus, the time measurement plate carries out timing through STD bus, and the porch that flows into fuel tank at fluid is provided with save-all 4.

Save-all 4 is fixed on the fuel-displaced mouth of pipe by top nut 7, is nut body 8 below the top nut 7, has hole 13 on the circumference of nut body 8 equably, and nut body 8 outsides are equipped with the splash guard 10 that profile is a truncated cone-shaped, and splash guard has for 10 times splash-proof canister 12 to be fixed in the fuel tank.

Nut body 8 bottoms in the save-all 4 are connected to lower nut 9, are connected to splash guard 11 on the lower nut 9.

The total area of perforate is 10: 1～2 with the ratio of the oil-in total area on nut body 8 circumference in the save-all 4.

There is a truncated cone-shaped splash-proof canister upper end in the save-all 4.

Below in conjunction with accompanying drawing in detail the utility model is described in detail.

Fig. 1 is the utility model hydraulic flow meter checking device structural representation.

Fig. 2 is computing machine control section synoptic diagram in this device.

Fig. 3 is save-all 4 structural representations among Fig. 1.

Fig. 4 is the cut-open view of nut body 8 among Fig. 3.

Fig. 5 is time measurement plate circuit theory diagrams among Fig. 2.

Fig. 6 is single-chip microcomputer tally circuit theory diagrams among Fig. 2.

Fig. 7 is Fig. 2 medium frequency display circuit schematic diagram.

Fig. 8 is function key circuit theory diagrams among Fig. 2.

Fig. 9 is digital tablet I/O circuit theory diagrams among Fig. 2.

The utility model with advanced person's timing, weigh, means such as frequency measurement combine, entering the fuel tank place at fluid has increased save-all, can reduce the impact that produces when fluid enters fuel tank, reduces measuring error.

Referring to Fig. 1, in use, hydraulic oil is through being flowed into oil-in I by proving flowmeter 1, and T arrives this device through point for measuring temperature.When function key is " automatically ", oil return valve DT ₁With fuel outlet valve DT ₃Automatically open, fluid is got back to fuel tank through oil return opening 0.When function key is selected " verification begins ", inlet valve DT ₂Open DT ₁, DT ₃Close, verification formally begins, and fluid is by retaining valve 2, inlet valve DT ₂Enter weighing fuel tank 3 through save-all 4, this moment, electronic scales PT constantly sent signal input computing machine to the variation of weight, was imported computing machine simultaneously by the temperature value of the pulsed frequency of proving flowmeter 1 and fluid, when verification finishes automatically, and DT ₂Automatically close, simultaneously DT ₁, DT ₃Open system oil return.

This device adopts industrial computer STD to control whole measuring process, referring to Fig. 2, import electronic scales display instrument 5 through digital tablet I/O input STD bus by the weight change value that electronic scales PT measures through the A point, the temperature value of measuring through point for measuring temperature T from the C point through digital temperature measurement and control instrument 6, numeral tablet I/O input STD bus, imported STD bus from the B point through the single-chip microcomputer tally by the pulsed frequency that proving flowmeter 1 produces, show on screen through I/O plate and frequency display circuit, its timing part is finished by the time measurement plate, function key is finished the startup of being controlled by CPU through the I/O plate from STD bus, verification begins, finish, automatically, manually, deposit, printing function, solenoid valve control circuit are control DT ₁, DT ₂, DT ₃Break-make.This control section also comprises system's support plate, Floppy Disk Controller, floppy disk, demonstration/finger-board, display, keyboard and printer.

The timing of this device is partly adopted width modulation and is finished with the method that the high frequency time-base signal is filled, referring to Fig. 5, count and the time read control circuit by buffer circuit control from the signal that STD comes, according to order from STD bus, counting and time read control circuit can reset and start 32 digit counter work, main pulse generator counting when promptly beginning standard; Also can be with the counter input and latch to latch cicuit, thus obtain starting to time when reading counter output from counter.

The frequency measurement of this device is to become the M/T method by single-chip microcomputer, the flow sensor frequency measurement, referring to Fig. 6, the flow sensor frequency signal is input to the counting synchronization control circuit through the photoelectricity isolation, main pulse when time-base generator produces the standard of certain frequency, under Single-chip Controlling, the synchronous input of main pulse signal when the counting synchronization control circuit is finished flow sensor frequency signal and standard.Two pass road counter is realized the synchronous counting of two kinds of signals.Single-chip microcomputer is delivered to STD bus with count value in real time through bus buffer.

Fig. 7 is the frequency display circuit schematic diagram, isolates buffer circuit from the frequency signal binary-coded decimal that digital I/O plate comes through photoelectricity, then through the actual value of decoding scheme by the light-emitting diode display display frequency.

Fig. 8 is the function key schematic diagram, and during by function key, the function key control circuit starts the function key latch cicuit, and the function key assignments is latched, and delivers to digital I/O plate simultaneously, the state of function key indicating circuit show function keys.

Fig. 9 is digital tablet circuit diagram, isolates input buffer circuit from the function key state that the function key circuit comes through photoelectricity, under the control of input/output control circuit, delivers to STD bus through bus buffer circuit.Equally, under the control of input/output control circuit, the frequency binary-coded decimal that comes from STD bus is latched to output latch circuit, isolates through photoelectricity then and is sent to frequency display circuit.

Fig. 3,4 is the structural representation of save-all 4, and save-all 4 is screwed on the fuel-displaced mouth of pipe by top nut 7, and top nut is connected with nut body 87 times, have circular hole 13 on the circumference of nut body 8 equably, the circular hole total area is about 10: 1 with the ratio of the oil-in total area～and 2, like this, flow velocity is reduced by dilatation.There is splash guard 10 in nut body 8 outsides, being connected with lower nut 9 below the nut body 8 links to each other with splash guard 11, fluid flows to splash guard 10 after by circular hole 13, flow to the outside of splash guard 11 by diffuse reflection, flow to again on the round platform on splash-proof canister 12 tops, splash-proof canister 12 is fixed in the fuel tank, can prevent that the fluctuation of fluid from causing new liquid flow impact.

Compared with prior art, the utility model with advanced person's frequency measurement, timing, weigh Carry out combination etc. means, and in fuel tank, be provided with save-all, can improve the essence of measurement Degree, and overcome fluid impact in the weighing process.

Claims (5)

1. hydraulic flow meter on-line testing device, it comprises: by industrial computer STD control survey overall process, imported STD bus from the B point through the single-chip microcomputer tally by the pulsed frequency that proving flowmeter 1 produces, fluid flows into weighing fuel tank 3 from advancing not have mouthful I through point for measuring temperature T, the temperature value that point for measuring temperature T measures from the C point through digital temperature measurement and control instrument 6, numeral tablet I/O input STD bus, the following of weighing fuel tank is electronic scales PT, the gravimetric value of measuring from the A point through electronic scales display instrument 5, numeral tablet I/O input STD bus, the time measurement plate carries out timing through STD bus, it is characterized in that: the porch that flows into fuel tank at fluid is provided with save-all 4.

2. device according to claim 1, it is characterized in that: described save-all 4 is fixed on the fuel-displaced mouth of pipe by top nut 7, below the top nut 7 is nut body 8, have hole 13 on the circumference of nut body 8 equably, nut body 8 outsides are equipped with the splash guard 10 that profile is a truncated cone-shaped, and splash guard has for 10 times splash-proof canister 12 to be fixed in the fuel tank.

3. device according to claim 2 is characterized in that: nut body 8 bottoms in the described save-all 4 are connected to lower nut 9, are connected to splash guard 11 on the lower nut 9.

4. according to the device of claim 2, it is characterized in that: the total area of perforate is 10: 1～2 with the ratio of the oil-in total area on nut body 8 circumference in the described save-all 4.

5. device according to claim 2 is characterized in that: save-all 4 in splash-proof canister upper end one truncated cone-shaped is arranged.

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