A gas chromatography oil inlet and return device with oil circuit on-off detection and its use method

Abstract

The present invention discloses a gas chromatography oil inlet and return device with oil circuit on-off detection and a method for using the same. The power drive assembly of the device drives the telescopic rod of the cylinder to move linearly, and a temperature sensor is arranged on the cylinder; the cylinder port A001 is connected to the first port of the three-way connecting pipe T01, the second port of the three-way connecting pipe T01 is connected to the oil inlet pipeline through the solenoid valve V01, and the third port of the three-way connecting pipe T01 is connected to the oil return pipeline through the solenoid valve V02; the cylinder port A002 is connected to the first port of the three-way connecting pipe T02, the second port of the three-way connecting pipe T02 is connected to one end of the solenoid valve V03, and the other end of the solenoid valve V03 is emptied; the third port of the three-way connecting pipe T02 is connected to the air inlet of the mist oil isolation container through the solenoid valve V04, the air outlet of the mist oil isolation container is connected to one end of the solenoid valve V05, and the other end of the solenoid valve V05 is emptied; the pressure sensor and the liquid level sensor are respectively installed on the mist oil isolation container. The present invention realizes accurate quantification of oil through the precise coordination of the stepping motor, the cylinder and the magnetic switch.

Description

Technical Field

[0001] The invention relates to a gas chromatographic oil inlet and return device with oil circuit continuity detection and a use method thereof, and in particular to a gas chromatographic oil inlet and return device with oil circuit continuity detection and a use method thereof. Background Art

[0002] A gas chromatography oil inlet and return device with oil circuit on-off detection and a use method thereof. Summary of the invention

[0003] The object of the present invention is to provide a gas chromatography oil inlet and return device with oil circuit on-off detection and a use method thereof.

[0004] The technical solution adopted by the present invention is:

[0005] A gas chromatography oil inlet and return device with oil circuit on-off detection, comprising a power drive component, the power drive component drives the telescopic rod of the cylinder to move linearly, the initial position of the cylinder is provided with a limit switch S05, the quantitative position of the cylinder is provided with a limit switch S04; the cylinder is provided with a temperature sensor; the cylinder has an oil port A001 and an air outlet A002, the air port A001 of the cylinder is connected to the first port of a three-way connecting pipe T01, the second port of the three-way connecting pipe T01 is connected to the oil inlet pipeline through an electromagnetic valve V01, and the three-way connecting pipe T01 is connected to the oil inlet pipeline. The third port is connected to the oil return pipeline through the solenoid valve V02; the air port A002 of the cylinder is connected to the first port of the three-way connecting pipe T02, the second port of the three-way connecting pipe T02 is connected to one end of the solenoid valve V03, and the other end of the solenoid valve V03 is vented; the third port of the three-way connecting pipe T02 is connected to the air inlet of the mist oil isolation container through the solenoid valve V04, the air outlet of the mist oil isolation container is connected to one end of the solenoid valve V05, and the other end of the solenoid valve V05 is vented; the pressure sensor and the liquid level sensor are respectively installed on the mist oil isolation container.

[0006] Further, as a preferred embodiment, the internal volumes of the three-way connecting pipe T01 and the three-way connecting pipe T02 are the same, and are both one fifth of the internal volume of the mist oil isolation container.

[0007] Furthermore, as a preferred embodiment, the cylinder is provided with an upper breathing port corresponding to the movable cavity of the telescopic rod for exhausting air during the telescopic action of the cylinder.

[0008] Further, as a preferred embodiment, the power drive assembly includes a stepper motor, a screw and a rotary-to-linear motion device, the internal rotor of the stepper motor is connected to the screw, and the screw is connected to the telescopic rod of the cylinder through the rotary-to-linear motion device.

[0009] Further, as a preferred embodiment,

[0010] Further, as a preferred embodiment, the limit switch S05 and the limit switch S04 are fixed to the slot on the top of the cylinder by screws.

[0011] A method for using a gas chromatography oil inlet and return device with oil circuit continuity detection, comprising an oil injection process and an oil sampling process;

[0012] The steps of the oil injection process are as follows;

[0013] Step 11, open the solenoid valve V03 and the solenoid valve V05 to start the oil injection process;

[0014] Step 12, detecting whether the limit switch S05 at the zero position of the cylinder is in an open state; if so, executing step 13; otherwise, driving the cylinder to be compressed by the power drive assembly until the switch S05 is in an open state to ensure that the cylinder is in the zero position, and executing step 13;

[0015] Step 13, start the pressure sensor and the temperature sensor to detect and record the initial pressure P0 and temperature T0 respectively;

[0016] Step 14, close the solenoid valve V03 and the solenoid valve V05, and open the solenoid valve V04 at the same time; and the power drive assembly drives the cylinder to stretch to the quantitative position;

[0017] Step 15, calculate the cylinder volume VC when obtaining the quantitative position, and record the pressure P1 and temperature T1 at this time;

[0018] Step 16, close the solenoid valve V04 and open the solenoid valve V03 at the same time; and the power drive assembly drives the cylinder to compress and move to the zero position to complete the oil injection process;

[0019] The steps of the oil sampling process are as follows;

[0020] Step 21, open the solenoid valve V01, and at the same time, the power drive assembly drives the cylinder to stretch to a quantitative position;

[0021] Step 22, open the solenoid valve V04 and detect the pressure P2 and temperature T2 at this time through the pressure sensor and temperature sensor;

[0022] Step 23, when the temperature T1 is equal to T2, determine whether the pressure P2 is approximately equal to (P1+atm / 5); if so, determine whether the oil fills the quantitative space of the cylinder; otherwise, determine whether the oil does not fill the quantitative space of the cylinder, and execute step 24;

[0023] Step 24, dispatch the fault cause according to the specific situation;

[0024] When P2 is approximately equal to 1 atm, it is determined that the oil inlet pipe connected to the solenoid valve V01 is in an empty state, and it is judged that the oil pipe has a major rupture or the oil pipe is not connected to the solenoid valve V01;

[0025] When P2 is approximately equal to P1, it is judged that the solenoid valve V01 cannot be opened normally or its connecting oil pipe is closed;

[0026] When P1<P2<(P1+atm / 5), it is judged that the oil inlet pipeline is blocked and is in a micro-conduction state, and further judgment is made based on the size of P2 data.

[0027] Further, as a preferred implementation, in step 21, the solenoid valve V01 is kept open for 60 seconds and then closed to ensure that the oil fills the cylinder.

[0028] Further, as a preferred embodiment, in step 22, the quantitative space of the oil-filled cylinder is further determined by the following means to confirm the quantitative volume of the oil, specifically: the power drive component continuously compresses the internal volume V of the three-way connecting pipe T01 and the three-way connecting pipe T02 T Finally, compress the micro-step again. When the liquid level sensor signal is triggered, it is confirmed that the quantitative volume meets the requirements, thus achieving accurate quantitative measurement.

[0029] Further, as a preferred embodiment, the determination step of the oil return connection pipeline is the same as the oil injection process and the oil sampling process.

[0030] The present invention adopts the above technical scheme to realize an oil sampling device that can judge the on / off state of the oil inlet and outlet and can accurately quantify the oil. The stepper motor drives the cylinder piston rod to realize linear motion, thereby generating a negative pressure environment inside the cylinder, and cooperates with the use of a pressure sensor to realize the above judgment. The oil sample taken can realize accurate quantification of the oil through the precise coordination of the stepper motor, cylinder and magnetic switch. The three-way connecting pipeline, connecting pipe and oil mist isolation container used can be quantified, and other components such as cylinders and solenoid valves are all standard components. The sensors used all adopt mature technology solutions to achieve consistency of pressure state. The oil sampling device of the present invention has few parts, and the parts used for interconnection can be well quantified. The operation is precise and controllable, the structure is simple, the quantification is accurate, and the on / off state can be known. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments;

[0032] Figure 1 is a general assembly diagram of the oil sampling device of the present invention;

[0033] Figure 2 is a diagram of a power drive assembly of the present invention;

[0034] Figure 3 is a cylinder diagram of the present invention;

[0035] Figure 4 It is a structural schematic diagram of the three-way connecting pipe T01 of the present invention;

[0036] Figure 5 It is a schematic diagram of the structure of the three-way connecting pipe T02 of the present invention;

[0037] Figure 6 It is a diagram of the oil mist isolation container of the present invention. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application.

[0039] like Figures 1 to 6 As shown in FIG. 1 , the present invention discloses a gas chromatography oil inlet and return device with oil circuit on-off detection, which includes a power drive component, which drives the telescopic rod of the cylinder to move linearly.

[0040] A temperature sensor is provided on the cylinder; the cylinder has an oil port A001 and an air outlet A002, the air port A001 of the cylinder is connected to the first port of the three-way connecting pipe T01, the second port of the three-way connecting pipe T01 is connected to the oil inlet pipeline through the solenoid valve V01, and the third port of the three-way connecting pipe T01 is connected to the oil return pipeline through the solenoid valve V02; the air port A002 of the cylinder is connected to the first port of the three-way connecting pipe T02, the second port of the three-way connecting pipe T02 is connected to one end of the solenoid valve V03, and the other end of the solenoid valve V03 is vented; the third port of the three-way connecting pipe T02 is connected to the air inlet of the mist oil isolation container through the solenoid valve V04, the air outlet of the mist oil isolation container is connected to one end of the solenoid valve V05, and the other end of the solenoid valve V05 is vented; a pressure sensor and a liquid level sensor are respectively installed on the mist oil isolation container.

[0041] Further, as a preferred embodiment, the internal volumes of the three-way connecting pipe T01 and the three-way connecting pipe T02 are the same, and are both one fifth of the internal volume of the mist oil isolation container.

[0042] Furthermore, as a preferred embodiment, the cylinder is provided with an upper breathing port corresponding to the movable cavity of the telescopic rod for exhausting air during the telescopic action of the cylinder.

[0043] Further, as a preferred embodiment, a limit switch S05 is provided at the initial position of the cylinder, and a limit switch S04 is provided at the quantitative position of the cylinder;

[0044] Further, as a preferred embodiment, the limit switch S05 and the limit switch S04 are fixed to the slot on the top of the cylinder by screws.

[0045] Further, as a preferred embodiment, the cylinder is a gas-liquid dual-purpose cylinder, and its sample gas outlet A002 and oil port A001 are connected through the internal space of the cylinder. The two ports are distributed on two surfaces of the cylinder and are vertical, and the breathing port A003 is isolated from the above two ports.

[0046] The piston inside the cylinder is provided with an oil-resistant sealing ring and a magnetic annular material. The limit switch arranged on the top slot is a magnetic detection switch, that is, it detects the position of the magnetic ring of the piston inside the cylinder.

[0047] Further, as a preferred embodiment, the power drive assembly includes a stepper motor, a screw and a rotation-to-linear motion device, the internal rotor of the stepper motor is connected to the screw, and the screw is connected to the telescopic rod of the cylinder through the rotation-to-linear motion device. The internal rotor of the stepper motor drives the screw to move, and due to the locking of the rotation-to-linear motion assembly, the rotation-to-linear motion assembly is not allowed to rotate axially, which can ensure that the telescopic rod of the cylinder only moves linearly.

[0048] Further, as a preferred embodiment, the three oil inlet and outlet pipes in the three-way connecting pipes T01 and T02 are interconnected through the central cavity, and the internal diameter of all the inlet and outlet pipes is Φ2.

[0049] Furthermore, as a preferred embodiment, the solenoid valve is of direct current direct-acting type, and its structure is of two-position two-way type. When powered on, the interfaces at both ends of the solenoid valve are connected.

[0050] Furthermore, as a preferred embodiment, the oil intake and return device of the present invention is connected to related component devices through a connecting pipe, and the connecting pipe is a stainless steel seamless steel pipe with an internal diameter of Φ2.

[0051] The specific working principle of the present invention is described in detail below:

[0052] like Figure 1 As shown, the internal rotor of the stepper motor M001 is connected to the screw rod M002, and the screw rod M002 is connected to the telescopic rod of the cylinder CQ01 through the rotary linear motion device M003. The limit switch S05 is set to the initial position of the cylinder, that is, the zero position, and the limit switch S04 is set to the quantitative position of the cylinder. The two limit switches are locked to the slot on the top of the cylinder by their own screws. The upper breathing port A003 of the cylinder is used for air intake and exhaust when the cylinder is telescopic. A002 serves as the outlet of the cylinder gas. The oil port A001 of the cylinder is connected to the first port of the three-way connecting pipeline T01 through the connecting pipe 003.

[0053] The second port of the three-way connecting pipe T01 is connected to the A end of the solenoid valve V01 through the connecting pipe 001, and the B end of the solenoid valve V01 is connected to the oil inlet pipeline, so that the solenoid valve V01 acts as an oil inlet valve. The third port of the three-way connecting pipe T01 is connected to the A end of the solenoid valve V02 through the connecting pipe 002, and the B end of the solenoid valve V02 is connected to the oil return pipeline, so that the solenoid valve V02 acts as an oil return valve. The cylinder gas outlet A002 is connected to the first port of the three-way connecting pipeline T02 through the connecting pipe 006, the second port of the three-way connecting pipeline T02 is connected to the B end of the solenoid valve V03 through the connecting pipe 004, the A end of the solenoid valve V03 is vented, the third port of the three-way connecting pipeline T02 is connected to the B end of the solenoid valve V04 through the connecting pipe 005, the A end of the solenoid valve V04 is connected to the air inlet Q001 of the oil mist isolator Q01 through the connecting pipe T05, the oil mist isolator Q01 is provided with an internal threaded hole Q002 for installing the pressure sensor S01, the oil mist isolator Q01 is provided with an internal threaded hole Q003 for installing the liquid level sensor S02,, the Q004 air outlet of the oil mist isolator Q01 is connected to the B end of the solenoid valve V05 through the connecting pipe T06, and the A end of the solenoid valve V05 is vented.

[0054] In the present invention, the three-way connecting pipeline T01 and T02 are further configured to have the same internal volume, which is set to V T , are 1 / 5 of the internal volume of the oil mist isolator.

[0055] During the preparation process, the T01 connection pipeline is filled with oil by default. When the oil injection process starts, the solenoid valves V03 and V05 are opened, and the limit switch S05 is started for detection. If it is in the open state, the power drive component does not move. If it is in the closed state, the power drive component performs compression until the limit switch S05 is opened, that is, the cylinder is ensured to be in the zero position. At this time, the pressure sensor and temperature sensor are started to detect and record the value P 0 , T 0 Close the solenoid valves V03 and V05, open the solenoid valve V04, and the power drive assembly performs a stretching motion to the quantitative position. The volume of the cylinder at the quantitative position is known (cylinder cross-sectional area × stroke), recorded as V C , record the pressure and temperature at this time as P 1 , T 1 . Close V04, open V03, and the power drive assembly performs compression to the zero position.

[0056] During the oil sampling process, open the solenoid valve V01, and at the same time, the power drive assembly stretches to the quantitative position. To ensure that the oil fills the cylinder, keep V01 in the open state for 60 seconds and then close it. Open the solenoid valve V04 and record the pressure and temperature at this time as P 2 , T 2 At this time, according to the ideal gas state equation, if the oil fills the cylinder quantitative space at this time, the pressure is in the ideal state (T1 =T 2 ), P2 ≈ P1 + atm / 5. To further confirm the quantitative volume of the oil, the power drive assembly continuously compresses V T After that, further compressing a small amount step by step can trigger the signal of the liquid level sensor. At this time, it is confirmed that the quantitative volume meets the requirements, that is, precise quantification is achieved. If P2 ≈ 1 atm, it is considered that the B end of the solenoid valve V01 is connected to the oil inlet pipeline and emptied, which can judge that there is a large rupture in the oil pipe or the oil pipe is not connected to the solenoid valve V01. If P2 ≈ P1, it is judged that the solenoid valve V01 fails to open normally or its B end is connected to the oil pipeline and closed. If P1 < P2 < P1 + atm / 5, it is judged that the oil inlet pipeline is not smooth, that is, in a micro-conduction state, and the situation can be further judged according to the magnitude of the P2 data.

[0057] The judgment steps for the oil return connection pipeline are the same as above.

[0058] The present invention adopts the above technical solutions to realize an oil sampling device for judging the on-off of the oil inlet and outlet and precise quantification. The linear motion is realized by driving the piston rod of the cylinder by a stepping motor, so as to generate a negative pressure environment inside the cylinder. With the use of a pressure sensor, the above judgment is realized. The oil sample taken can achieve precise quantification of the oil through the precise cooperation of the stepping motor, the cylinder and the magnetic switch. The used three-way connection pipeline, connecting pipe, and oil mist isolation container can be quantified. Other components such as cylinders and solenoid valves are all standard components, and the used sensors all adopt mature technology solutions, which can achieve the consistency of the pressure state. The oil sampling device of the present invention has few components, the components used for mutual connection can be well quantified, the operation is precise and controllable, the structure is simple, the quantification is accurate, and the on-off is known.

[0059] Obviously, the described embodiments are part of the embodiments of this application, rather than all the embodiments. Without conflict, the embodiments and features in the embodiments of this application can be combined with each other. Usually, the components of the embodiments of this application described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the detailed description of the embodiments of this application is not intended to limit the scope of this application claimed, but merely represents the selected embodiments of this application. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of this application.

Claims

1. A method for using a gas chromatography oil inlet and return device with oil circuit on-off detection, the gas chromatography oil inlet and return device with oil circuit on-off detection comprising a power drive assembly, the power drive assembly drives the telescopic rod of the cylinder to move linearly, the cylinder is provided with a limit switch S05 at the initial position, and the cylinder is provided with a limit switch S04 at the quantitative position; the cylinder is provided with a temperature sensor; the cylinder has an oil port A001 and an air outlet A002, the oil port A001 of the cylinder is connected to the first port of a three-way connecting pipe T01, and the second port of the three-way connecting pipe T01 is connected to the electromagnetic valve V01 The third port of the three-way connecting pipe T01 is connected to the oil return pipeline through the solenoid valve V02; the air port A002 of the cylinder is connected to the first port of the three-way connecting pipe T02, the second port of the three-way connecting pipe T02 is connected to one end of the solenoid valve V03, and the other end of the solenoid valve V03 is vented; the third port of the three-way connecting pipe T02 is connected to the air inlet of the mist oil isolation container through the solenoid valve V04, the air outlet of the mist oil isolation container is connected to one end of the solenoid valve V05, and the other end of the solenoid valve V05 is vented; the pressure sensor and the liquid level sensor are respectively installed on the mist oil isolation container; Features: The internal volumes of the three-way connecting pipe T01 and the three-way connecting pipe T02 are the same, and are both one-fifth of the internal volume of the mist oil isolation container; the method includes a sampling process and an oil sampling process; The steps of the injection process are as follows; Step 11, open the solenoid valve V03 and the solenoid valve V05 to start the injection process; Step 12, detecting whether the limit switch S05 at the zero position of the cylinder is in an open state; if so, executing step 13; otherwise, driving the cylinder to be compressed by the power drive assembly until the limit switch S05 is in an open state to ensure that the cylinder is in the zero position, and executing step 13; Step 13, start the pressure sensor and the temperature sensor to detect and record the initial pressure P0 and temperature T0 respectively; Step 14, close the solenoid valve V03 and the solenoid valve V05, and open the solenoid valve V04 at the same time; and the power drive assembly drives the cylinder to stretch to the quantitative position; Step 15, calculate the cylinder volume VC when obtaining the quantitative position, and record the pressure P1 and temperature T1 at this time; Step 16, close the solenoid valve V04 and open the solenoid valve V03 at the same time; and the power drive assembly drives the cylinder to compress and move to the zero position to complete the injection process; The steps of the oil sampling process are as follows; Step 21, open the solenoid valve V01, and at the same time, the power drive assembly drives the cylinder to stretch to a quantitative position; Step 22, open the solenoid valve V04 and detect the pressure P2 and temperature T2 at this time through the pressure sensor and temperature sensor; Step 23, when the temperature T1 is equal to T2, determine whether the pressure P2 is equal to (P1+atm / 5); if so, determine whether the oil fills the quantitative space of the cylinder; otherwise, determine whether the oil does not fill the quantitative space of the cylinder, and execute step 24; Step 24, dispatch the fault cause according to the specific situation; When P2 is equal to 1atm, it is determined that the oil inlet pipe connected to the solenoid valve V01 is in an empty state, and it is judged that the oil pipe is broken or the oil pipe is not connected to the solenoid valve V01; When P2 is equal to P1, it is judged that the solenoid valve V01 cannot be opened normally or its connecting oil pipe is closed; When P1<P2<(P1+atm / 5), it is judged that the oil inlet pipeline is blocked and is in a micro-conduction state, and further judgment is made based on the size of P2 data.

2. A method for using a gas chromatography oil inlet and return device with oil circuit continuity detection according to claim 1, Features: The cylinder is provided with an upper breathing port corresponding to the telescopic rod activity cavity for exhausting air during the telescopic action of the cylinder.

3. A method for using a gas chromatography oil inlet and return device with oil circuit continuity detection according to claim 1, Features: The power drive assembly includes a stepper motor, a lead screw and a rotary-to-linear motion device. The internal rotor of the stepper motor is connected to the lead screw, and the lead screw is connected to the telescopic rod of the cylinder through the rotary-to-linear motion device.

4. A method for using a gas chromatography oil inlet and return device with oil circuit continuity detection according to claim 1, Features: The limit switch S05 and the limit switch S04 are fixed to the slot on the top of the cylinder by screws.

5. A method for using a gas chromatography oil inlet and return device with oil circuit continuity detection according to claim 1, Features: In step 21, the solenoid valve V01 is kept open for 60 seconds and then closed to ensure that the oil fills the cylinder.

6. A method for using a gas chromatography oil inlet and return device with oil circuit continuity detection according to claim 1, Features: In step 22, when the pressure P2 is equal to (P1+atm / 5), the quantitative space of the oil-filled cylinder is further determined by the following means to confirm the quantitative volume of the oil: the power drive assembly continuously compresses the internal volume V of the three-way connecting pipe T01 and the three-way connecting pipe T02 T Finally, it is compressed in a micro-step. When the liquid level sensor signal is triggered, it is confirmed that the quantitative volume meets the requirements, thus achieving precise quantitative measurement.

7. A method for using a gas chromatography oil inlet and return device with oil circuit continuity detection according to claim 1, Features: The judgment steps of the oil return connection pipeline are the same as the injection process and oil sampling process.

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