Fully-automatic oil sample dispensing device based on multi-channel switching valve and control method thereof

Abstract

The present application relates to a kind of full-automatic oil sample dispensing device based on multi-channel switching valve and its control method;The rack of the dispensing device is provided with N storage grids, an oil sample bag and air bag are placed in each storage grid, the oil outlet pipe of N oil sample bags is respectively communicated with the N oil inlet hole of first multi-channel switching valve, the center hole of first and second multi-channel switching valve is communicated, the M oil outlet hole of second multi-channel switching valve is respectively communicated with M analysis unit interface, air, carrier gas and blank oil interface are communicated with the inlet of three-way electromagnetic valve through different electromagnetic valves, the first outlet of three-way electromagnetic valve is communicated with the cleaning hole of first multi-channel switching valve, the second outlet is communicated with the emptying hole of second multi-channel switching valve;The control method steps of the device are: flushing to oil inlet pipeline, flushing to analysis pipeline, cleaning to public pipeline, cleaning to pipeline with oil sample, sample introduction;The present application has high cleanliness, high degree of automation, high efficiency and speed, and low running cost.

Description

TECHNICAL FIELD

[0001] The present application relates to an oil sample distribution device and a control method thereof, in particular to a full-automatic oil sample distribution device based on a multi-channel switching valve and a control method thereof. BACKGROUND

[0002] In the power industry, transformer insulating oil has important functions and roles, it is not only used for electrical insulation, but also can bear cooling, arc extinguishing, corrosion prevention and other functions. Therefore, the regular analysis and monitoring of transformer insulating oil can provide important information about the health status and potential failure of the transformer.

[0003] The related test items of transformer insulating oil involve more than ten categories such as insulating oil chromatography, gas content, breakdown voltage, dielectric loss, micro water, acid value, flash point, interfacial tension, and kinematic viscosity. Laboratory analysis requires the use of chromatographs, micro water detectors and other instruments for separate analysis. The analysis of transformer insulating oil samples involves sampling, pretreatment, analysis and other links. The existing insulating oil test instrument can only be automatic in the analysis link, and still relies on a large amount of manual operation in the processing of batch samples, the transfer of intermediate products, the flushing and cleaning of test units, sample injection, instrument recovery and post-test tailoring. In the actual operation process, in addition to the insufficient level of operators, a large number of samples will also cause more operation errors, resulting in a large deviation of the detected data results from the actual values, low credibility of comprehensive result analysis, and great influence on the accurate evaluation of the operating state of the transformer equipment.

[0004] The existing insulating oil analysis product batch processing usually adopts the mode of setting a pump in the public pipeline to extract the oil sample for oil sample injection. This mode will cause the oil sample to be difficult to clean in the pump body, resulting in cross contamination of the next oil sample during detection, and inaccurate detection results. Another mode is to set an oil pump at the oil supply end. This mode needs to configure a pump body for each oil sample. Although cross contamination is avoided, multiple pumps need to be configured, which is high in cost. The pump body can also be cleaned after each use for the next use, but there is a problem of difficult pump body cleaning, which is not suitable for large batch detection requirements. In addition, the laboratory insulating oil analysis product generally uses a syringe for sampling or a bottle for sampling. The syringe has a capacity limit and cannot meet the demand of multiple parameter analysis. The bottle sample also has the problem of poor sealing when stored. SUMMARY

[0005] The technical problem to be solved by the present application is to provide a full-automatic oil sample distribution device based on a multi-channel switching valve and a control method thereof, which has high cleanliness, high automation, high efficiency, fast speed and low running cost.

[0006] The technical scheme of the present application is as follows:

[0007] A fully automatic oil sample dispensing device based on a multi-channel switching valve includes a frame, N oil sample bags, N air bladders, N air pumps, N oil sample bag interfaces, a first multi-channel switching valve, a second multi-channel switching valve, an air interface, a carrier gas interface, a blank oil interface, M analysis unit interfaces, an air solenoid valve, a carrier gas solenoid valve, a blank oil solenoid valve, a three-way solenoid valve, a pressure relief solenoid valve, a venting solenoid valve, and a control circuit. The frame has N storage compartments arranged from left to right, each compartment... Each of the N compartments contains an oil sample bag and an air bladder, with the oil sample bag and air bladder in each compartment being constrained by the side wall of the compartment and pressed against each other. Above the N compartments is a long, narrow interface plate, with its two ends facing left and right respectively. The interfaces for the N oil sample bags are sequentially installed on the interface plate from left to right, each interface corresponding to one of the N oil sample bags. The oil outlet pipes of the N oil sample bags are connected to the N inlet ports of the first multi-channel switching valve through the N oil sample bag interfaces. The air outlet of the air pump is connected to the air inlet pipes of N airbags respectively; the center hole of the first multi-channel switching valve is connected to the center hole of the second multi-channel switching valve, the M oil outlets of the second multi-channel switching valve are connected to the interfaces of M analysis units respectively, the air interface, carrier gas interface and blank oil interface are connected to the inlet of the three-way solenoid valve through the air solenoid valve, carrier gas solenoid valve and blank oil solenoid valve respectively, the first outlet of the three-way solenoid valve is connected to the cleaning hole of the first multi-channel switching valve, the second outlet of the three-way solenoid valve is connected to the vent hole of the second multi-channel switching valve, the inlet of the three-way solenoid valve is also connected to the waste oil tank through the pressure relief solenoid valve, and the second outlet of the three-way solenoid valve is also connected to the waste oil tank through the vent solenoid valve, N and M are both natural numbers greater than or equal to 1; the electrical signal terminals of the N air pumps, the first multi-channel switching valve, the second multi-channel switching valve, the air solenoid valve, the carrier gas solenoid valve, the blank oil solenoid valve, the three-way solenoid valve, the pressure relief solenoid valve and the vent solenoid valve are all connected to the control circuit.

[0008] The N storage compartments are formed by N+1 parallel vertical plates. The N+1 vertical plates are fixedly installed on the oil receiving tray on the frame from left to right. The vertical plates and the oil receiving tray are fixedly connected together by L-shaped corner brackets. The oil sample bags and air bladders are both flat in shape, and the oil sample bags and air bladders in each storage compartment are placed vertically side by side. Under the constraint of the left and right side walls of the storage compartment, the flat surfaces of the oil sample bags and air bladders are squeezed against each other.

[0009] The interface board is horizontally set up, and N airbag interfaces are also installed on the interface board. The N airbag interfaces are installed on one side of the N oil sample bag interfaces. The N oil sample bag interfaces are located above the N oil sample bags, and the N airbag interfaces are located above the N airbags. The air outlets of the N inflation pumps are connected to the air inlet pipes of the N airbags through the N airbag interfaces. The oil sample bag interfaces are snapped onto the snap-fit ​​interface on the front side of the interface board.

[0010] Each compartment has an embedded NFC reader at the bottom, and each oil sample bag has an NFC card sticker affixed to its bottom. The electrical signal interface of each NFC reader is connected to the control circuit. The NFC card sticker contains information about the oil sample inside the bag. When the oil sample bag is placed in the compartment, the information is read. The control circuit can identify the oil sample information through the NFC reader. When a specific oil sample needs to be tested, the control circuit controls the corresponding air pump to work. The air bladder corresponding to that oil sample will inflate, forcing the oil sample out of the bag and then through the bag's interface into the inlet of the first multi-channel switching valve.

[0011] Alternatively, each oil sample bag is affixed with a label, and the electrical signal interface of the barcode scanner used with the label is connected to the control circuit. By manually scanning the label with a handheld barcode scanner, the control circuit can identify the oil sample information, as the label contains information about the oil sample inside the bag.

[0012] The identification sticker can be a QR code sticker or a barcode sticker.

[0013] N air pumps, a first multi-channel switching valve, a second multi-channel switching valve, an air solenoid valve, a carrier gas solenoid valve, a blank oil solenoid valve, a three-way solenoid valve, a pressure relief solenoid valve, and a venting solenoid valve are all mounted on the rack. The air interface, carrier gas interface, blank oil interface, and M analytical unit interfaces are all mounted on the side of the rack. The control circuit can be mounted separately on the rack or integrated into subsequent equipment (such as a chromatograph).

[0014] The oil sample bag is equipped with a manual valve on its outlet pipe for easy storage. A pressure sensor is installed on the connecting pipe between the second outlet of the three-way solenoid valve and the vent hole of the second multi-channel switching valve. The electrical signal terminal of the pressure sensor is connected to the control circuit. The pressure sensor can prevent the pipeline pressure from exceeding the safe range and detect pipeline leaks.

[0015] A control method for the aforementioned fully automatic oil sample dispensing device based on a multi-channel switching valve specifically comprises: introducing pressurized air to the air interface, introducing pressurized carrier gas to the carrier gas interface, introducing pressurized blank oil to the blank oil interface, connecting the sample inlets of M analytical units to the interfaces of the M analytical units respectively, connecting the oil outlets of the M analytical units to the waste oil tank, disconnecting the oil outlet pipes of N oil sample bags from the interfaces of the N oil sample bags respectively, and then powering on the control circuit to perform the following control steps:

[0016] Step 1: Flush the front-end oil inlet pipeline: The control circuit controls the air solenoid valve, carrier gas solenoid valve, blank oil solenoid valve, pressure relief solenoid valve, and vent solenoid valve to close; then, the control circuit controls the center hole of the second multi-channel switching valve to connect with the vent hole, controls the inlet of the three-way solenoid valve to connect with the second outlet, and controls the center hole of the first multi-channel switching valve to connect with N oil inlet holes in sequence. Each time a connection is made, the air solenoid valve, blank oil solenoid valve, and carrier gas solenoid valve are opened for a period of time and then closed in sequence.

[0017] Step 2: Connect the oil outlet pipes of N oil sample bags to the interfaces of N oil sample bags respectively;

[0018] Step 3: Flush the back-end analysis pipeline: The control circuit controls the inlet of the three-way solenoid valve to connect with the first outlet, controls the center hole of the first multi-channel switching valve to connect with the cleaning hole, and controls the center hole of the second multi-channel switching valve to connect with M oil outlet holes in sequence. Each time a connection is made, the air solenoid valve, blank oil solenoid valve, and carrier gas solenoid valve are opened and closed in sequence for a period of time.

[0019] Step 4: Clean the common pipeline: The control circuit connects the center hole of the second multi-channel switching valve with the vent hole, controls the vent solenoid valve to open, and controls the air solenoid valve, blank oil solenoid valve, and carrier gas solenoid valve to open and close in sequence for a period of time, so as to flush the pipeline between the two multi-channel switching valves.

[0020] Step 5: Clean the pipeline using oil samples: The control circuit connects the center hole of the first multi-channel switching valve to the selected oil inlet and the center hole of the second multi-channel switching valve to the selected oil outlet. Then, the selected air pump performs P air inflation operations. Each air inflation operation is as follows: the selected air pump works for a period of time and then stops for a period of time. The air inflation operation transports the oil sample from the selected oil sample bag to the selected analysis unit. After reaching the required volume, the operation stops. Subsequently, the selected analysis unit drains the oil sample, completing one cleaning cycle. The selected oil inlet refers to the inlet corresponding to the selected oil sample bag, and the selected oil outlet refers to the outlet corresponding to the selected analysis unit. The selected air pump refers to the air pump corresponding to the selected air bag. The selected air bag and the selected oil sample bag are located in the same storage compartment. P is a natural number greater than or equal to 1.

[0021] When the selected air pump is working, it will inflate the selected air bag, thereby squeezing the selected oil sample bag, so that the oil sample in the selected oil sample bag enters the selected oil inlet, and then flows out from the selected oil outlet and enters the selected analysis unit, thus achieving the purpose of transferring the oil sample in the selected oil sample bag to the selected analysis unit.

[0022] Step 6, Sample Injection: The control circuit controls the selected inflation pump to perform one inflation operation.

[0023] The beneficial effects of this invention are:

[0024] 1. This invention uses an inflatable airbag to squeeze the oil sample bag, causing the oil sample to be squeezed out and sequentially enter the first multi-channel switching valve and the second multi-channel switching valve, and then enter the analysis unit. This avoids the problems of existing technologies that use oil pumps to transport oil, such as incomplete flushing of the oil pump in the pipeline, cross-contamination, waste caused by the need for a large amount of blank oil for flushing, waste caused by configuring a pump for each type of oil sample, and long flushing time of the oil pump. This invention improves the cleanliness of the device and the detection accuracy of the analysis unit, speeds up the flushing time, saves resources and is environmentally friendly, has low operating costs, and the oil sample bag is convenient to store and manage.

[0025] 2. This invention uses a first multi-channel switching valve to input multiple oil samples and a second multi-channel switching valve to supply oil to multiple analysis units. It can automatically select and supply oil, which is fast, efficient and highly automated.

[0026] 3. This invention includes an air interface, a carrier gas interface, and a blank oil interface, which can automatically perform oil and gas flushing on the multi-channel oil inlet pipeline at the front end and the multi-channel analysis pipeline at the rear end, resulting in fast and clean cleaning.

[0027] 4. Each compartment of the present invention has an NFC card reader embedded in its bottom surface, and each oil sample bag has an NFC card sticker affixed to its bottom, which can automatically record the information of the oil sample to be tested, resulting in a high degree of automation. Attached Figure Description

[0028] Fig. 1 This is a schematic diagram of a fully automatic oil sample dispensing device based on a multi-channel switching valve.

[0029] Fig. 2 An enlarged structural diagram illustrating the positional relationship between the oil sample bag and the air bladder;

[0030] Fig. 3 A magnified side view of the oil sample bag and air bladder placed in the storage compartment;

[0031] Fig. 4 This is a schematic diagram of the oil circuit structure of a fully automatic oil sample distribution device based on a multi-channel switching valve. Specific Implementation

[0032] See Figs. 1-4The figure shows a fully automatic oil sample dispensing device based on a multi-channel switching valve, comprising a frame 1, seven oil sample bags 3, seven air bladders 4, seven air pumps, seven oil sample bag interfaces 6, a first multi-channel switching valve Q1, a second multi-channel switching valve Q2, an air interface 12, a carrier gas interface 13, a blank oil interface 14, two analysis unit interfaces 15, an air solenoid valve D1, a carrier gas solenoid valve D2, a blank oil solenoid valve D3, a three-way solenoid valve D6, a pressure relief solenoid valve D4, an evacuation solenoid valve D5, and a control circuit. The frame 1 has seven storage compartments arranged from left to right. Each compartment contains one oil sample bag 3 and one air bladder 4, with the oil sample bag 3 and air bladder 4 in each compartment being squeezed against each other by the constraint of the compartment side wall; a long strip interface plate 16 is set above the seven compartments, with the two ends of the interface plate 16 facing left and right respectively, and the seven oil sample bag interfaces 6 are installed on the interface plate 16 from left to right, with each of the seven oil sample bag interfaces 6 corresponding to one of the seven oil sample bags 3, and the oil outlet pipes 8 of the seven oil sample bags 3 are connected to the seven oil inlet holes a to g of the first multi-channel switching valve Q1 through the seven oil sample bag interfaces 6 respectively, and the seven filling... The air pump outlet is connected to the air inlet pipe 10 of each of the seven air bags 4; the center hole i of the first multi-channel switching valve Q1 is connected to the center hole j of the second multi-channel switching valve Q2; the two oil outlet holes p and q of the second multi-channel switching valve Q2 are connected to the interfaces 15 of the two analysis units, respectively; the air interface 12, the carrier gas interface 13, and the blank oil interface 14 are connected to the inlet z of the three-way solenoid valve D6 through the air solenoid valve D1, the carrier gas solenoid valve D2, and the blank oil solenoid valve D3, respectively; and the first outlet x of the three-way solenoid valve D6 is connected to the cleaning hole of the first multi-channel switching valve Q1. h is connected, the second outlet y of the three-way solenoid valve D6 is connected to the vent hole k of the second multi-channel switching valve Q2, the inlet z of the three-way solenoid valve D6 is also connected to the waste oil tank through the pressure relief solenoid valve D4, and the second outlet y of the three-way solenoid valve D6 is also connected to the waste oil tank through the vent solenoid valve D5; the electrical signal terminals of the 7 air pumps, the first multi-channel switching valve Q1, the second multi-channel switching valve Q2, the air solenoid valve D1, the carrier gas solenoid valve D2, the blank oil solenoid valve D3, the three-way solenoid valve D6, the pressure relief solenoid valve D4, and the vent solenoid valve D5 are all connected to the control circuit.

[0033] The seven storage compartments are formed by eight parallel vertical plates 5 (the leftmost vertical plate 5 is replaced by the left side plate 20 of the frame 1). The eight vertical plates 5 are fixedly installed on the oil receiving tray 2 on the frame 1 from left to right. The vertical plates 5 and the oil receiving tray 2 are fixedly connected together by L-shaped corner brackets 11. The oil sample bags 3 and air bladders 4 are both flat in shape, and the oil sample bags 3 and air bladders 4 in each storage compartment are placed vertically side by side. Under the constraint of the left and right side walls of the storage compartment, the flat surfaces of the oil sample bags 3 and air bladders 4 are squeezed against each other.

[0034] The interface plate 16 is horizontally set, and seven airbag interfaces 7 are also installed on the interface plate 16. The seven airbag interfaces 7 are respectively installed on one side of the seven oil sample bag interfaces 6. The seven oil sample bag interfaces 6 are respectively located above the seven oil sample bags 3, and the seven airbag interfaces 7 are respectively located above the seven airbags 4. The air outlets of the seven air pumps are connected to the air inlet pipes 10 of the seven airbags 4 through N and the seven airbag interfaces 7 respectively. The oil sample bag interfaces 6 are snapped onto the snap-fit ​​interface on the front side of the interface plate 16.

[0035] Each storage compartment has an NFC reader 17 embedded in its bottom surface, and each oil sample bag 3 has an NFC card sticker 18 affixed to its bottom. The electrical signal interface of each NFC reader 17 is connected to the control circuit. The NFC card sticker 18 contains information about the oil sample inside the oil sample bag 3. When the oil sample bag 3 is placed in the storage compartment, the information about the oil sample inside the oil sample bag 3 is read. The control circuit can identify the oil sample information through the NFC reader 17. When a certain oil sample needs to be tested, the control circuit controls the corresponding air pump to work, and the air bag 4 corresponding to the oil sample will inflate, forcing the oil sample in the oil sample bag 3 to be squeezed out, and then entering the oil inlet holes a to g of the first multi-channel switching valve Q1 through the oil sample bag interface 6.

[0036] Seven air pumps, a first multi-channel switching valve Q1, a second multi-channel switching valve Q2, an air solenoid valve D1, a carrier gas solenoid valve D2, a blank oil solenoid valve D3, a three-way solenoid valve D6, a pressure relief solenoid valve D4, and a venting solenoid valve D5 are all mounted on the frame 1. An air interface 12, a carrier gas interface 13, a blank oil interface 14, and two analysis unit interfaces 15 are all mounted on the side of the frame 1. The control circuit is integrated into subsequent equipment (such as a chromatograph).

[0037] The oil sample bag 3 is equipped with a manual valve 9 on the oil outlet pipe 8 for easy storage of the oil sample bag 3. A pressure sensor T is installed on the connecting pipe between the second outlet y of the three-way solenoid valve D6 and the vent hole k of the second multi-channel switching valve Q2. The electrical signal terminal of the pressure sensor T is connected to the control circuit. The pressure sensor T can prevent the pipeline pressure from exceeding the safe range and detect pipeline leakage.

[0038] The control method for the fully automatic oil sample dispensing device based on a multi-channel switching valve is as follows: Pressurized air is supplied to air interface 12, pressurized carrier gas is supplied to carrier gas interface 13, and pressurized blank oil is supplied to blank oil interface 14. The inlets of the two analytical units (micro-water analysis unit and chromatograph analysis unit) are connected to interfaces 15 of the two analytical units respectively. The outlets of the two analytical units are connected to the waste oil container. The outlet pipes 8 of the seven oil sample bags 3 are disconnected from interfaces 6 of the seven oil sample bags respectively. Then, the control circuit is powered on, and the following control steps are performed:

[0039] Step 1: Flushing the front-end oil inlet pipeline: The control circuit controls the air solenoid valve D1, carrier gas solenoid valve D2, blank oil solenoid valve D3, pressure relief solenoid valve D4, and venting solenoid valve D5 to close; then, the control circuit controls the center hole j of the second multi-channel switching valve Q2 to connect with the venting hole k, controls the inlet z of the three-way solenoid valve D6 to connect with the second outlet y, and controls the center hole i of the first multi-channel switching valve Q1 to connect with the 7 oil inlet holes a to g in sequence. Each time a connection is made, the air solenoid valve D1, blank oil solenoid valve D3, and carrier gas solenoid valve D2 are opened for a period of time and then closed.

[0040] Step 2: Connect the oil outlet pipes 8 of the 7 oil sample bags 3 to the interfaces 6 of the 7 oil sample bags respectively;

[0041] Step 3: Flush the back-end analysis pipeline: The control circuit controls the inlet z of the three-way solenoid valve D6 to connect with the first outlet x, controls the center hole i of the first multi-channel switching valve Q1 to connect with the cleaning hole h, and controls the center hole j of the second multi-channel switching valve Q2 to connect with the two oil outlet holes p and q in sequence. Each time the connection is made, the air solenoid valve D1, the blank oil solenoid valve D3, and the carrier gas solenoid valve D2 are opened for a period of time and then closed.

[0042] Step 4: Clean the common pipeline: The control circuit controls the center hole j of the second multi-channel switching valve Q2 to connect with the vent hole k, controls the vent solenoid valve D5 to open, and controls the air solenoid valve D1, blank oil solenoid valve D3, and carrier gas solenoid valve D2 to open and close in sequence for a period of time, so as to flush the pipeline between the two multi-channel switching valves.

[0043] Step 5: Clean the pipeline using an oil sample: The control circuit connects the center hole i of the first multi-channel switching valve Q1 to the selected oil inlet a, and connects the center hole j of the second multi-channel switching valve Q2 to the selected oil outlet p. Then, the selected air pump is controlled to perform three air inflation operations. Each air inflation operation is as follows: the selected air pump works for a period of time and then stops for a period of time. The air inflation operation delivers the oil sample from the selected oil sample bag 3 to the selected analysis unit. After reaching the required volume, the operation stops. Subsequently, the selected analysis unit drains the oil sample, completing one cleaning cycle. The selected oil inlet a refers to the oil inlet corresponding to the selected oil sample bag 3, and the selected oil outlet p refers to the oil outlet corresponding to the selected analysis unit. The selected air pump refers to the air pump corresponding to the selected air bag 4. The selected air bag 4 and the selected oil sample bag 3 are located in the same storage compartment.

[0044] When the selected air pump is working, it will inflate the selected air bag 4, thereby squeezing the selected oil sample bag 3, so that the oil sample in the selected oil sample bag 3 enters the selected oil inlet a, and then flows out from the selected oil outlet p, and enters the selected analysis unit, thereby achieving the purpose of transferring the oil sample in the selected oil sample bag 3 to the selected analysis unit.

[0045] Step 6, Sample Injection: The control circuit controls the selected inflation pump to perform one inflation operation.

Claims

1. A fully automatic oil sample dispensing device based on a multi-channel switching valve, characterized in that: The instrument includes a frame, N oil sample bags, N air bladders, N air pumps, N oil sample bag interfaces, a first multi-channel switching valve, a second multi-channel switching valve, an air interface, a carrier gas interface, a blank oil interface, M analysis unit interfaces, an air solenoid valve, a carrier gas solenoid valve, a blank oil solenoid valve, a three-way solenoid valve, a pressure relief solenoid valve, a venting solenoid valve, and control circuitry. The frame has N storage compartments arranged from left to right, each containing one oil sample bag and one air bladder, with the oil sample bag and air bladder in each compartment being restrained by the side walls of the compartment. A long, narrow interface is located above the N storage compartments. The interface board has its two ends facing left and right, respectively. N oil sample bag interfaces are sequentially installed on the interface board from left to right, each corresponding to a different oil sample bag. The oil outlet pipes of the N oil sample bags are connected to the N inlet ports of the first multi-channel switching valve via the N oil sample bag interfaces. The air outlets of the N air pumps are connected to the air inlet pipes of the N air bladders. The center hole of the first multi-channel switching valve is connected to the center hole of the second multi-channel switching valve. The M oil outlet ports of the second multi-channel switching valve are connected to the M analysis unit interfaces. The air interface, carrier gas interface, and blank oil interface are connected via air solenoid valves, carrier gas solenoid valves, and blank oil interfaces, respectively. The solenoid valve and the blank oil solenoid valve are connected to the inlet of the three-way solenoid valve. The first outlet of the three-way solenoid valve is connected to the cleaning port of the first multi-channel switching valve. The second outlet of the three-way solenoid valve is connected to the vent port of the second multi-channel switching valve. The inlet of the three-way solenoid valve is also connected to the waste oil tank through the pressure relief solenoid valve. The second outlet of the three-way solenoid valve is also connected to the waste oil tank through the vent solenoid valve. N and M are both natural numbers greater than or equal to 1. The electrical signals of N air pumps, the first multi-channel switching valve, the second multi-channel switching valve, the air solenoid valve, the carrier gas solenoid valve, the blank oil solenoid valve, the three-way solenoid valve, the pressure relief solenoid valve, and the vent solenoid valve are... All ends are connected to the control circuit; N storage compartments are formed by N+1 parallel vertical plates, and the N+1 vertical plates are fixedly installed on the oil receiving tray on the frame from left to right; the oil sample bags and air bladders are both flat in shape, and the oil sample bags and air bladders in each storage compartment are placed vertically side by side. Under the constraint of the left and right side walls of the storage compartment, the flat surfaces of the oil sample bags and air bladders squeeze each other; the oil outlet pipe of the oil sample bag is equipped with a manual valve, and a pressure sensor is installed on the connecting pipe between the second outlet of the three-way solenoid valve and the vent hole of the second multi-channel switching valve. The electrical signal terminal of the pressure sensor is connected to the control circuit.

2. The fully automatic oil sample dispensing device based on a multi-channel switching valve according to claim 1, characterized in that: The interface plate is horizontally arranged, and N airbag interfaces are also installed on the interface plate. The N airbag interfaces are respectively installed on one side of the N oil sample bag interfaces. The N oil sample bag interfaces are respectively located above the N oil sample bags, and the N airbag interfaces are respectively located above the N airbags. The air outlets of the N inflation pumps are connected to the air inlet pipes of the N airbags through the N airbag interfaces. The oil sample bag interfaces are snapped onto the snap-fit ​​interface on the front side of the interface plate.

3. The fully automatic oil sample dispensing device based on a multi-channel switching valve according to claim 1, characterized in that: Each of the storage compartments has an NFC card reader embedded in its bottom surface, and each oil sample bag has an NFC card sticker affixed to its bottom. The electrical signal interface of each NFC card reader is connected to the control circuit.

4. The fully automatic oil sample dispensing device based on a multi-channel switching valve according to claim 1, characterized in that: Each of the oil sample bags is affixed with an identification code sticker, and the electrical signal interface of the barcode scanner used with the identification code sticker is connected to the control circuit.

5. The fully automatic oil sample dispensing device based on a multi-channel switching valve according to claim 4, characterized in that: The identification sticker is a QR code sticker or a barcode sticker.

6. The fully automatic oil sample dispensing device based on a multi-channel switching valve according to claim 1, characterized in that: The N air pumps, the first multi-channel switching valve, the second multi-channel switching valve, the air solenoid valve, the carrier gas solenoid valve, the blank oil solenoid valve, the three-way solenoid valve, the pressure relief solenoid valve, and the venting solenoid valve are all mounted on the frame. The air interface, the carrier gas interface, the blank oil interface, and the M analysis unit interfaces are all mounted on the side of the frame.

7. A control method for a fully automatic oil sample dispensing device based on a multi-channel switching valve as described in any one of claims 1 to 6, characterized in that: Connect pressurized air to the air inlet, pressurized carrier gas to the carrier gas inlet, and pressurized blank oil to the blank oil inlet. Connect the inlet ports of the M analytical units to their respective interfaces, connect the outlet ports of the M analytical units to the waste oil container, and disconnect the outlet pipes of the N oil sample bags from their respective interfaces. Then, power on the control circuit and perform the following control steps: Step 1: Flush the front-end oil inlet pipeline: The control circuit controls the air solenoid valve, carrier gas solenoid valve, blank oil solenoid valve, pressure relief solenoid valve, and vent solenoid valve to close; then, the control circuit controls the center hole of the second multi-channel switching valve to connect with the vent hole, controls the inlet of the three-way solenoid valve to connect with the second outlet, and controls the center hole of the first multi-channel switching valve to connect with N oil inlet holes in sequence. Each time a connection is made, the air solenoid valve, blank oil solenoid valve, and carrier gas solenoid valve are opened for a period of time and then closed in sequence. Step 2: Connect the oil outlet pipes of N oil sample bags to the interfaces of N oil sample bags respectively; Step 3: Flush the back-end analysis pipeline: The control circuit controls the inlet of the three-way solenoid valve to connect with the first outlet, controls the center hole of the first multi-channel switching valve to connect with the cleaning hole, and controls the center hole of the second multi-channel switching valve to connect with M oil outlet holes in sequence. Each time a connection is made, the air solenoid valve, blank oil solenoid valve, and carrier gas solenoid valve are opened and closed in sequence for a period of time. Step 4: Clean the common pipeline: The control circuit connects the center hole of the second multi-channel switching valve with the vent hole, controls the vent solenoid valve to open, and controls the air solenoid valve, blank oil solenoid valve, and carrier gas solenoid valve to open sequentially for a period of time and then close. Step 5: Clean the pipeline using an oil sample: The control circuit connects the center hole of the first multi-channel switching valve to the selected oil inlet, and connects the center hole of the second multi-channel switching valve to the selected oil outlet. Then, it controls the selected air pump to perform P air inflation operations. Each air inflation operation involves the selected air pump working for a period of time and then stopping for a period of time. The selected oil inlet refers to the oil inlet corresponding to the selected oil sample bag, and the selected oil outlet refers to the oil outlet corresponding to the selected analysis unit. The selected air pump refers to the air pump corresponding to the selected air bag. The selected air bag and the selected oil sample bag are located in the same storage compartment. P is a natural number greater than or equal to 1. Step 6, Sample Injection: The control circuit controls the selected inflation pump to perform one inflation operation.

Images