Continuous flow variable temperature dynamic positive displacement piston system

Abstract

A continuous flow variable temperature dynamic positive displacement piston system includes an oil tank, an oil pump, a flow meter to be tested, a standard flow meter, and a continuous measurement component connected in series; the oil tank is a variable temperature oil tank that can adjust the oil temperature; the oil pump provides power for the oil; the standard flow meter can roughly measure the flow meter to be tested; the flow meter to be tested and the standard flow meter both have thermometers that can monitor the oil temperature; the continuous measurement component includes a pneumatic reversing valve and a standard piston mechanism; the standard piston mechanism can accurately measure the flow meter to be tested; the constant temperature hole of the piston cylinder can match the temperature of the oil in the piston cylinder with the oil in the flow meter to be tested; the pneumatic reversing valve can switch the oil flow direction in time to enable the standard piston mechanism to continuously detect; the present invention can use both a standard flow meter for rough measurement and a continuous measurement component for precise measurement, and is compatible with a large number of flow meters to be tested; the continuous measurement component can make the oil in the flow meter to be tested, the standard flow meter, and the piston cylinder isothermal, with high detection accuracy, and can also enable the oil pump to continuously transport oil for detection, with high work efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of liquid flow meter detection, in particular to a continuous flow variable temperature dynamic volume piston system. Background Art

[0002] Liquid flowmeters are precision instruments that utilize the Karman vortex principle to measure the flow of liquids in sealed pipes. They are essential components for metering and process control in modern production. Liquid flowmeters can measure flow in two ways: by volume or by weight. Both volumetric and weight-based flowmeters require regular testing to ensure accuracy and ensure safe and effective metering and process control. Flowmeters are generally tested in two ways: one is to connect a standard flowmeter in series with the flowmeter under test and then pass oil through the two to check for consistency. However, this method uses a standard flowmeter with inherent errors, resulting in limited accuracy. The other method uses a measuring device to weigh or measure the volume of the oil flowing through the flowmeter under test over a specified period of time. The average flow velocity is then calculated to test the flowmeter under test. While this method offers higher accuracy than a standard flowmeter, it only measures volume or weight intermittently, making it inefficient. Furthermore, this method can also produce errors in the results of liquid flowmeters, as the oil does not reach the operating temperature or pressure during volume measurement. There is no technical solution to the above problems in the prior art. Summary of the Invention

[0003] The purpose of the present invention is to solve the above problems and provide a continuous flow variable temperature dynamic volume piston system.

[0004] The technical solution of the present invention is: a continuous flow variable temperature dynamic positive displacement piston system, comprising an oil tank, an oil pump, a flow meter to be tested, a standard flow meter, and a continuous measurement component connected in series in sequence; the oil tank is a variable temperature oil tank; the oil pump input end is connected to the bottom of the oil tank; the oil pump output end is connected to the flow meter to be tested; the flow meter to be tested and the standard flow meter are both connected in series with a thermometer; the continuous measurement component includes a pneumatic reversing valve and a standard piston mechanism;

[0005] The pneumatic reversing valve comprises a left valve body, a middle cylinder and a right valve body; the middle cylinder comprises a cylinder body and a cylinder piston rod; a cylinder piston is provided at the midpoint of the cylinder piston rod; the cylinder piston slides closely against the inner wall of the cylinder body; a connecting port A is provided in the middle of the left and right valve bodies; connecting ports B and connecting ports C are provided on both sides of the connecting port A of the left and right valve bodies; a reversing chamber connected with the connecting port A, a connecting chamber A connected with the connecting port B, and a connecting chamber B connected with the connecting port C are provided in the left and right valve bodies; the reversing chamber is connected with the connecting chamber A and the connecting chamber B respectively; the setting direction of the connecting chamber A and the connecting chamber B is in the same direction as the axial direction of the cylinder piston rod; a conical valve core A and a conical valve core B corresponding to the connecting chamber A and the connecting chamber B respectively are provided in the reversing chamber; the conical valve core A and the conical valve core B are coaxially connected to the end of the cylinder piston rod after being connected through the valve stem;

[0006] The standard piston mechanism includes a piston cylinder, a standard piston rod, a constant temperature ring, and a piston end cover. The standard piston rod is sleeved in the piston cylinder. The piston end covers are installed at both ends of the piston cylinder through the constant temperature ring. Both ends of the standard piston rod pass through the constant temperature ring and the piston end cover.

[0007] A standard piston is provided at the midpoint of the standard piston rod; the standard piston slides closely against the inner wall of the piston cylinder; reduction rings are provided on the standard piston rods on both sides of the standard piston; a reduction groove is provided on the inner end face of the piston end cover to match the reduction ring;

[0008] The piston cylinder end is circumferentially distributed with thermostatic holes penetrating the inner wall of the piston cylinder; the thermostatic ring is provided with a thermostatic groove connected to the thermostatic holes; the circumferential surface of the thermostatic ring is provided with a thermostatic interface connected to the thermostatic groove;

[0009] The piston cylinder is divided into piston chamber A and piston chamber B by a standard piston; the piston cylinder end is provided with piston interface A and piston interface B connected to piston chamber A, and piston interface C and piston interface D connected to piston chamber B;

[0010] The standard flowmeter is connected to the connection port A of the right valve body; the connection port B of the right valve body is connected to the piston interface D; the connection port C of the right valve body is connected to the piston interface B; the connection port A of the left valve body is connected to the oil tank; the connection port B of the left valve body is connected to the piston interface A; the connection port C of the left valve body is connected to the piston interface C.

[0011] Preferably, the continuous flow variable temperature dynamic volumetric piston system is also connected in series with a pressure gauge.

[0012] Preferably, the oil pump input end is connected to filter A; filter A is connected to the bottom of the oil tank through an oil tank connector.

[0013] Preferably, the output end of the oil pump is connected to a one-way valve whose guiding direction is the same as the output direction of the oil pump; the one-way valve is connected to the flow meter to be tested.

[0014] Preferably, an overflow valve is connected between the one-way valve and the flow meter to be tested; the output end of the overflow valve is connected to the upper part of the oil tank.

[0015] Preferably, the output end of the oil pump is connected to filter B; filter B is connected to the flow meter to be tested.

[0016] Preferably, the output end of the oil pump is connected to the flow meter to be tested through a regulating valve.

[0017] Preferably, the standard flow meter is connected to the continuous measurement component via a switch valve.

[0018] Preferably, the end face of the deceleration ring is provided with a rubber pad corresponding to the deceleration groove; and the circumferential surface of the deceleration ring is provided with a taper of 5°.

[0019] Preferably, a boss is provided on the inner end surface of the piston end cover; the outer circumference of the boss is tightly fitted on the inner wall of the constant temperature ring and the inner wall of the piston cylinder.

[0020] The beneficial effects of the present invention are as follows: the continuous flow variable temperature dynamic positive displacement piston system of the present invention includes an oil tank, an oil pump, a flow meter to be tested, a standard flow meter, and a continuous measurement component connected in series; the oil tank is a variable temperature oil tank, which can adjust the oil temperature; the oil pump provides power for the oil; the standard flow meter can roughly measure the flow meter to be tested; the flow meter to be tested and the standard flow meter both have thermometers, which can monitor the oil temperature; the continuous measurement component includes a pneumatic reversing valve and a standard piston mechanism; the standard piston mechanism can accurately measure the flow meter to be tested; the constant temperature hole of the piston cylinder can match the temperature of the oil in the piston cylinder with the oil in the flow meter to be tested; the pneumatic reversing valve can switch the oil flow direction in time, so that the standard piston mechanism can continuously detect; the present invention can use both a standard flow meter for rough measurement and a continuous measurement component for precise measurement, and is compatible with a large number of flow meters to be tested; the continuous measurement component can make the oil in the flow meter to be tested, the standard flow meter, and the piston cylinder isothermal, with high detection accuracy, and can also enable the oil pump to continuously transport oil for detection, with high work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a connection diagram of the continuous flow temperature-variable dynamic displacement piston system of the present invention;

[0022] Figure 2 It is a cutaway perspective view of a standard piston;

[0023] Figure 3 It is an axial cross-sectional view of a standard piston;

[0024] Figure 4 yes Figure 3 AA section view;

[0025] Figure 5 It is a three-dimensional diagram of the piston cylinder;

[0026] Figure 6 It is a three-dimensional diagram of the constant temperature ring;

[0027] Figure 7 It is a three-dimensional view of the piston end cover;

[0028] Figure 8 It is a three-dimensional diagram of a pneumatic reversing valve;

[0029] Figure 9 yes Figure 7 A partial sectional view of the main view;

[0030] Figure 10 This is the working principle of the continuous measurement component Figure 1 ;

[0031] Figure 11 This is the working principle of the continuous measurement component Figure 2 ;

[0032] In the figure: 1. Fuel tank, 11. Fuel tank connector, 2. Fuel pump, 21. Filter A, 22. Check valve, 23. Filter B, 24. Control valve, 3. Flow meter to be tested, 4. Standard flow meter, 41. Switch valve, 5. Continuous measurement component, 51. Pneumatic reversing valve, 511. Left valve body, 5111. Connecting port A, 51111. Reversing chamber, 5112. Connecting port B, 51121. Connecting chamber A, 5113. Connecting port C, 51131. Connecting chamber B, 51141. Conical valve core A, 51142. Conical valve core B, 51143. Valve stem, 512. Intermediate cylinder, 5121. Cylinder body, 5122. Cylinder piston rod, 5122 1. Cylinder piston, 513. Right valve body, 514. Air source interface, 52. Standard piston mechanism, 521. Piston cylinder, 5211. Constant temperature hole, 5212. Piston chamber A, 52121. Piston interface A, 52122. Piston interface B, 5213. Piston chamber B, 52131. Piston interface C, 52132. Piston interface D, 522. Standard piston rod, 5221. Standard piston, 5222. Speed reducer ring, 52221. Rubber pad, 523. Constant temperature ring, 5231. Constant temperature bath, 5232. Constant temperature interface, 524. Piston end cover, 5241. Speed reducer groove, 5242. Boss, 6. Thermometer, 7. Pressure gauge, 8. Relief valve. DETAILED DESCRIPTION

[0033] Example: See Figure 1-11A continuous flow variable temperature dynamic positive displacement piston system includes an oil tank, an oil pump, a flow meter to be tested, a standard flow meter, and a continuous measurement component connected in series; the oil tank is a variable temperature oil tank, which refers to the structure disclosed in the utility model patent of a liquid flow standard device with the prior art publication number CN206362005U, which can cool or heat the oil passing through the flow meter to be tested to meet the operating temperature of the flow meter to be tested; the oil pump input end is connected to the bottom of the oil tank; the oil pump output end is connected to the flow meter to be tested; the oil pump is connected to the oil tank from the oil tank The oil is extracted from the flowmeter and sent to the flowmeter to be tested and the standard flowmeter. Both the flowmeter to be tested and the standard flowmeter are connected in series with thermometers to measure the temperature of the oil and monitor the temperature of the incoming oil. The temperature of the oil in the tank is then adjusted in conjunction with the oil tank to ensure that the oil meets the operating temperature when passing through the flowmeter to be tested and the standard flowmeter. The standard flowmeter is the benchmark for testing low-precision flowmeters to be tested. The continuous measurement component includes a pneumatic reversing valve and a standard piston mechanism. The pneumatic reversing valve drives the oil flow direction to switch. The standard piston mechanism is used for more accurate detection of the flowmeter to be tested.

[0034] The pneumatic reversing valve includes a left valve body, a middle cylinder and a right valve body; the middle cylinder is the driving part for switching the oil flow direction; the left and right valve bodies are the executive parts for switching the oil flow direction; the middle cylinder includes a cylinder body and a cylinder piston rod; a cylinder piston is provided at the midpoint of the cylinder piston rod; air source interfaces are provided at both ends of the cylinder body; the air source interface can intermittently supply high-pressure gas to drive the cylinder piston to slide back and forth close to the inner wall of the cylinder body; a connection port A is provided in the middle of the left and right valve bodies; a connection port B and a connection port C are provided on both sides of the connection port A of the left and right valve bodies; a reversing chamber connected to the connection port A, a connecting chamber A connected to the connection port B, and a connecting chamber B connected to the connection port C are provided in the left and right valve bodies; the reversing chamber is respectively connected to the connecting port The through chamber A and the connecting chamber B are connected; the setting direction of the connecting chamber A and the connecting chamber B is in the same direction as the axial direction of the cylinder piston rod; the reversing chamber is provided with a conical valve core A and a conical valve core B corresponding to the connecting chamber A and the connecting chamber B respectively; the conical valve core A and the conical valve core B are connected through the valve stem and are coaxially connected to the end of the cylinder piston rod; the reciprocating cylinder piston rod drives the conical valve core A and the conical valve core B to reciprocate together; when the conical valve core A blocks the connecting chamber A, the conical valve core B opens the connecting chamber B, and the oil flows between the reversing chamber and the connecting chamber B; when the conical valve core B blocks the connecting chamber B, the conical valve core A opens the connecting chamber A, and the oil flows between the reversing chamber and the connecting chamber A; the intermediate cylinder cooperates with the standard piston mechanism to intermittently input high-pressure gas;

[0035] The standard piston mechanism includes a piston cylinder, a standard piston rod, a constant temperature ring, and a piston end cover. The standard piston rod is sleeved in the piston cylinder. The piston end covers are installed at both ends of the piston cylinder through the constant temperature ring. Both ends of the standard piston rod pass through the constant temperature ring and the piston end cover.

[0036] A standard piston is provided at the midpoint of the standard piston rod; the standard piston slides closely against the inner wall of the piston cylinder; reduction rings are provided on the standard piston rods on both sides of the standard piston; a reduction groove is provided on the inner end face of the piston end cover to match the reduction ring;

[0037] The piston cylinder is divided into piston chamber A and piston chamber B by a standard piston; the piston cylinder end is provided with piston interface A and piston interface B connected to piston chamber A, and piston interface C and piston interface D connected to piston chamber B;

[0038] In this way, the oil entering through piston port A / piston port B will drive the standard piston to squeeze the oil in piston chamber B, so that the oil in piston chamber B will be discharged through piston port C / piston port D; see Figure 3 When the standard piston moves to its limit position in piston chamber B, a portion of the oil will be enclosed between the deceleration groove and the deceleration ring. After being squeezed, this enclosed oil will resist the inertial sliding of the standard piston rod to decelerate. At the same time, the standard piston will not exceed or block piston interface C / piston interface D. When the pneumatic reversing valve is reversed, the oil enters from piston interface A / piston interface B, driving the standard piston to squeeze the oil in piston chamber A. The accumulated lateral displacement of the standard piston's reciprocating motion can be used to calculate the total volume of the circulating oil (the radial cross-sectional area of piston chamber A / piston chamber B multiplied by the accumulated lateral displacement).

[0039] The piston cylinder end is provided with thermostatic holes extending through the inner wall of the piston cylinder; a thermostatic groove connected to the thermostatic holes is provided on the thermostatic ring; a thermostatic interface connected to the thermostatic groove is provided on the circumferential surface of the thermostatic ring; a thermostatic fluid flows through the thermostatic interface, and the thermostatic fluid flows through the thermostatic groove into the thermostatic hole; the thermostatic fluid in the thermostatic hole ensures that the oil entering the piston cylinder reaches the operating temperature, and the expansion coefficient of the oil in the piston cylinder is the same as that of the oil in the flow meter to be tested, so as to ensure that the total volume of the circulating oil can be matched with the flow meter to be tested when measuring it;

[0040] The standard flowmeter is connected to the connection port A of the right valve body; the oil flowing through the flowmeter to be tested and the standard flowmeter is connected to the connection port A of the right valve body; the connection port B of the right valve body is connected to the piston interface D; the oil flowing through the connection port B of the right valve body is connected to the piston cavity B; the connection port C of the right valve body is connected to the piston interface B; the oil flowing through the connection port C of the right valve body is connected to the piston cavity A; the connection port A of the left valve body is connected to the oil tank; the oil flowing through the connection port A of the left valve body goes to the oil tank; the connection port B of the left valve body is connected to the piston interface A; the oil flowing through the connection port B of the left valve body is connected to the piston cavity A; the connection port C of the left valve body is connected to the piston interface C; the oil flowing through the connection port C of the left valve body is connected to the piston cavity B.

[0041] In this way, the pneumatic reversing valve and the standard piston mechanism cooperate with each other; the pneumatic reversing valve can switch the oil flow direction when the standard piston of the standard piston mechanism reaches the limit position, and there is no need to stop the oil pump. The standard piston movement can be continuously accumulated to calculate the total volume of the circulating oil, and the average flow rate flowing through the flow meter to be tested during the time period can be obtained to detect the flow meter to be tested; when the standard piston movement is accumulated, the oil entering the piston cylinder is kept at a constant temperature, making the detection accuracy more accurate; the oil temperature is monitored by a thermometer, and the oil temperature is adjusted by the oil tank, so that oil flow meters with different operating temperatures can be tested.

[0042] The continuous flow variable temperature dynamic volumetric piston system is also connected in series with a pressure gauge to detect the oil pressure in the pipeline.

[0043] The input end of the oil pump is connected to filter A; filter A is connected to the bottom of the oil tank through the oil tank joint; after the oil output from the oil tank passes through filter A, impurities are blocked and will not enter the oil pump to cause damage.

[0044] The output end of the oil pump is connected to a one-way valve with a guiding direction the same as the output direction of the oil pump; the one-way valve is connected to the flow meter to be inspected, which can prevent the oil from backflowing to the output end of the oil pump and damaging the oil pump.

[0045] An overflow valve is connected between the one-way valve and the flow meter to be tested; the output end of the overflow valve is connected to the high point of the oil tank; the overflow valve is used to prevent overpressure of the oil flowing through the flow meter to be tested and the standard flow meter; when the oil is overpressured, the overflow valve will open and the oil will flow into the oil tank to relieve pressure.

[0046] The output end of the oil pump is connected to filter B; filter B is connected to the flow meter to be tested; filter B is used to filter the oil entering the flow meter to be tested and the standard flow meter to prevent impurities therein from entering the flow meter to be tested and the standard flow meter to cause damage.

[0047] The output end of the oil pump is connected to the flow meter to be tested through a regulating valve; the regulating valve is used to adjust the speed of the oil entering the flow meter to be tested and the standard flow meter.

[0048] The standard flow meter is connected to the continuous measurement component through an on-off valve for easy installation.

[0049] The end face of the reduction ring is provided with a rubber pad corresponding to the reduction groove to form a second buffer; the circumferential surface of the reduction ring is provided with a 5° taper to facilitate the oil to be sealed between the reduction groove and the reduction ring.

[0050] A boss is provided on the inner end face of the piston end cover; the outer circumference of the boss is tightly fitted on the inner wall of the constant temperature ring and the inner wall of the piston cylinder to prevent oil from leaking from the constant temperature ring and the piston cylinder, affecting the detection accuracy of the flow meter to be tested.

[0051] The working principle of this embodiment is as follows:

[0052] See also Figure 1 The oil in the oil tank is pumped out by the oil pump and flows continuously to the flow meter to be tested and the standard flow meter; the oil passing through the flow meter to be tested is switched by the pneumatic reversing valve in time, which can drive the standard piston to reciprocate in the piston cylinder; the oil flowing through the piston cylinder will be kept at the operating temperature by the thermostatic hole of the piston cylinder;

[0053] The thermometer measures the temperature of the oil flowing through the flow meter to be tested and the standard flow meter, and the oil tank then adjusts the temperature of the liquid in the tank according to the measured temperature; when the thermometer shows that the temperature of the oil meets the operating temperature, the movement of the standard piston begins to be accumulated; after a period of time, the total volume of the oil flowing through the flow meter to be tested can be obtained based on the accumulated movement of the standard piston, and then the average flow rate of the oil flowing through the thermometer to be tested during this period can be obtained to detect the accuracy of the flow meter to be tested.

[0054] The pneumatic reversing valve cooperates with the standard piston mechanism to switch in time:

[0055] See also Figure 10 , the cylinder piston rod drives the conical valve core A of the left and right valve bodies to move to the left uniformly, blocking the connecting chamber A of the left and right valve bodies; at this time, the oil enters the connecting port A of the right valve body, passes through the switching chamber and connecting chamber B of the right valve body, and then leaves the right valve body from the connecting port C of the right valve body, and then enters the piston chamber A through the piston interface B; because the route of the oil through the connecting port B and connecting chamber A of the left valve body via the piston interface A is blocked, the oil can only drive the standard piston to squeeze toward the piston chamber B; the oil in the piston chamber B is blocked through the piston interface D through the connecting port B and connecting chamber A of the right valve body, and can only flow to the oil tank through the connecting port C of the left cavity, connecting chamber B, switching chamber, and connecting port A;

[0056] See also Figure 11 , the cylinder piston rod drives the conical valve core B of the left and right valve bodies to move to the right uniformly, blocking the connecting chamber B of the left and right valve bodies; at this time, the oil enters the connecting port A of the right valve body, passes through the switching chamber and connecting chamber A of the right valve body, and then leaves the right valve body from the connecting port B of the right valve body, and then enters the piston chamber B through the piston interface D; because the route of the oil passing through the connecting port C and connecting chamber B of the left valve body through the piston interface C is blocked, the oil can only drive the standard piston to be squeezed toward the piston chamber A; the oil in the piston chamber A is blocked through the piston interface B through the connecting port C and connecting chamber B of the right valve body, and can only pass through the connecting port B, connecting chamber A, switching chamber, and connecting port A of the left cavity to the oil tank.

Claims

1. A continuous flow variable temperature dynamic positive displacement piston system, comprising an oil tank, an oil pump, a flow meter to be tested, a standard flow meter, and a continuous measurement assembly connected in series; the oil tank is a variable temperature oil tank; the oil pump input end is connected to the bottom of the oil tank; the oil pump output end is connected to the flow meter to be tested; the flow meter to be tested and the standard flow meter are both connected in series with a thermometer; characterized in that: The continuous measurement assembly includes a pneumatic reversing valve and a standard piston mechanism; The pneumatic reversing valve comprises a left valve body, a middle cylinder and a right valve body; the middle cylinder comprises a cylinder body and a cylinder piston rod; a cylinder piston is provided at the midpoint of the cylinder piston rod; the cylinder piston slides closely against the inner wall of the cylinder body; a connecting port A is provided in the middle of the left and right valve bodies; connecting ports B and connecting ports C are provided on both sides of the connecting port A of the left and right valve bodies; a reversing chamber connected with the connecting port A, a connecting chamber A connected with the connecting port B, and a connecting chamber B connected with the connecting port C are provided in the left and right valve bodies; the reversing chamber is connected with the connecting chamber A and the connecting chamber B respectively; the setting direction of the connecting chamber A and the connecting chamber B is in the same direction as the axial direction of the cylinder piston rod; a conical valve core A and a conical valve core B corresponding to the connecting chamber A and the connecting chamber B respectively are provided in the reversing chamber; the conical valve core A and the conical valve core B are coaxially connected to the end of the cylinder piston rod after being connected through the valve stem; The standard piston mechanism includes a piston cylinder, a standard piston rod, a constant temperature ring, and a piston end cover. The standard piston rod is sleeved in the piston cylinder. The piston end covers are installed at both ends of the piston cylinder through the constant temperature ring. Both ends of the standard piston rod pass through the constant temperature ring and the piston end cover. A standard piston is provided at the midpoint of the standard piston rod; the standard piston slides closely against the inner wall of the piston cylinder; reduction rings are provided on the standard piston rods on both sides of the standard piston; a reduction groove is provided on the inner end face of the piston end cover to match the reduction ring; The piston cylinder end is circumferentially distributed with thermostatic holes penetrating the inner wall of the piston cylinder; the thermostatic ring is provided with a thermostatic groove connected to the thermostatic holes; the circumferential surface of the thermostatic ring is provided with a thermostatic interface connected to the thermostatic groove; The piston cylinder is divided into piston chamber A and piston chamber B by a standard piston; the piston cylinder end is provided with piston interface A and piston interface B connected to piston chamber A, and piston interface C and piston interface D connected to piston chamber B; The standard flowmeter is connected to the connection port A of the right valve body; the connection port B of the right valve body is connected to the piston interface D; the connection port C of the right valve body is connected to the piston interface B; the connection port A of the left valve body is connected to the oil tank; the connection port B of the left valve body is connected to the piston interface A; the connection port C of the left valve body is connected to the piston interface C.

2. The continuous flow variable temperature dynamic displacement piston system according to claim 1, characterized in that: There is also a pressure gauge in series.

3. The continuous flow variable temperature dynamic displacement piston system according to claim 1, characterized in that: The oil pump input end is connected with filter A; filter A is connected to the bottom of the oil tank through the oil tank connector.

4. The continuous flow variable temperature dynamic displacement piston system according to claim 1, characterized in that: The output end of the oil pump is connected to a one-way valve with a guiding direction the same as the output direction of the oil pump; the one-way valve is connected to the flow meter to be tested.

5. The continuous flow variable temperature dynamic displacement piston system according to claim 4, characterized in that: An overflow valve is connected between the one-way valve and the flow meter to be tested; the output end of the overflow valve is connected to the upper part of the oil tank.

6. The continuous flow variable temperature dynamic displacement piston system according to claim 1, characterized in that: The output end of the oil pump is connected to filter B; filter B is connected to the flow meter to be tested.

7. The continuous flow variable temperature dynamic displacement piston system according to claim 1, characterized in that: The output end of the oil pump is connected to the flow meter to be tested through a regulating valve.

8. The continuous flow variable temperature dynamic displacement piston system according to claim 1, characterized in that: Standard flow meters are connected to continuous measurement components via on-off valves.

9. The continuous flow variable temperature dynamic displacement piston system according to claim 1, characterized in that: The end face of the deceleration ring is provided with a rubber pad corresponding to the deceleration groove; the circumferential surface of the deceleration ring is provided with a 5° taper.

10. The continuous flow variable temperature dynamic displacement piston system according to claim 1, characterized in that: The inner end surface of the piston end cover is provided with a boss; the outer circumference of the boss is tightly fitted on the inner wall of the constant temperature ring and the inner wall of the piston cylinder.

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