CN113655157A - Automatic insulating oil sample dilution instrument for oil chromatographic analysis and insulating oil sample dilution method - Google Patents
Automatic insulating oil sample dilution instrument for oil chromatographic analysis and insulating oil sample dilution method Download PDFInfo
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- 238000004587 chromatography analysis Methods 0.000 title claims abstract description 55
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- 238000003113 dilution method Methods 0.000 title description 5
- 238000002156 mixing Methods 0.000 claims abstract description 61
- 239000012895 dilution Substances 0.000 claims abstract description 41
- 238000010790 dilution Methods 0.000 claims abstract description 41
- 238000007865 diluting Methods 0.000 claims abstract description 26
- 238000000034 method Methods 0.000 claims abstract description 11
- 238000006073 displacement reaction Methods 0.000 claims description 57
- 238000002347 injection Methods 0.000 claims description 24
- 239000007924 injection Substances 0.000 claims description 24
- 238000004140 cleaning Methods 0.000 claims description 23
- 238000012544 monitoring process Methods 0.000 claims description 19
- 238000000605 extraction Methods 0.000 claims description 7
- 238000003825 pressing Methods 0.000 claims description 5
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- 238000009413 insulation Methods 0.000 description 3
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Abstract
The invention discloses an automatic insulating oil sample dilution instrument for oil chromatographic analysis, which comprises: the oil mixing component, the driving component, the valve component and the control component are arranged in the shell, and the oil storage component is arranged at the top of the shell; the oil mixing component is used for realizing mixing and dilution of an oil sample, the oil storage component is used for storing a standard oil sample, an insulating oil sample to be diluted and an insulating oil sample after dilution, and the control component is used for controlling the opening and closing of the driving component and the valve component; the oil mixing assembly is communicated with the oil storage assembly through a valve assembly and is connected with the output end of the driving assembly, under the driving of the driving assembly, the oil mixing assembly sucks a standard oil sample and an insulating oil sample to be diluted in the oil storage assembly, the standard oil sample and the insulating oil sample to be diluted are repeatedly mixed to obtain the diluted insulating oil sample, and the diluted insulating oil sample is stored in the oil storage assembly and is used for oil chromatographic analysis. The invention also discloses an insulating oil sample diluting method which is realized based on the automatic diluting instrument. The invention has the advantages of compact structure, accurate control of oil sample proportioning, high oil sample mixing efficiency and the like.
Description
Technical Field
The invention belongs to the technical field of power equipment, and particularly relates to an automatic insulating oil sample dilution instrument for oil chromatographic analysis and an insulating oil sample dilution method.
Background
The insulating oil used in oil-filled electrical equipment is mainly composed of hydrocarbons, and the insulating component in the oil is mainly carbohydrates. They decompose to produce H under the action of electrical or thermal faults2And low molecular hydrocarbon gases, e.g. CH4、C2H6、C2H4、C2H2When solid insulation is involved, in addition to the above gases, large amounts of CO and CO are produced2. These gases are also referred to as characteristic gases, since they help to determine internal faults of the oil-filled electrical apparatus. The chromatographic analysis of insulating oil for oil-filled electric equipment is one of the main technological measures for judging internal failure of equipment, and the chromatographic analysis of insulating oil is to separate out the characteristic gas dissolved in insulating oil and then to take outInjecting 1mL of gas sample into a chromatographic analyzer for analyzing the gas content to judge the characteristic gas concentration in the insulating oil sample. And the concentration of partial characteristic gas often appears in the inside insulating oil appearance of trouble electrical equipment is high for gas content exceeds the range of chromatographic analyzer, leads to the unable complete demonstration of characteristic gas content peak type, and the numerical value of obtaining is less than the actual content of characteristic gas in the insulating oil appearance far away, and then can't accurately judge electrical equipment's fault condition.
In the existing oil chemical analysis industry, a method for diluting an insulating oil sample to be detected by a standard oil sample according to a set proportion is generally adopted. The method is mainly characterized in that two oil samples are fully mixed to reduce the concentration of characteristic gas in the insulating oil sample to be detected, so that the characteristic gas concentration does not exceed the detection range of a chromatographic analyzer. However, the standard oil sample measurement, the insulation oil sample measurement to be detected and the dilution and mixing of the two oil samples are all performed manually, so that considerable human errors exist, the concentration of each characteristic gas component in the insulation oil sample to be detected cannot be accurately obtained, and the detection result is misled. Not only consumes a large amount of manpower, but also reduces the detection efficiency.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides an automatic insulating oil sample dilution instrument for oil chromatographic analysis and an insulating oil sample dilution method, wherein the automatic insulating oil sample dilution instrument is compact in structure, accurate in oil sample proportion control, high in oil sample mixing and dilution efficiency and high in intelligent degree.
In order to solve the technical problems, the invention adopts the following technical scheme:
an automatic dilution instrument of insulating oil sample for oil chromatographic analysis, comprising: the oil mixing component, the driving component, the valve component and the control component are arranged in the shell, and the oil storage component is arranged at the top of the shell; the oil mixing assembly is used for mixing and diluting a standard oil sample and an insulating oil sample to be diluted, the oil storage assembly is used for storing the standard oil sample, the insulating oil sample to be diluted and the diluted insulating oil sample, and the control assembly is used for controlling the opening and closing of the driving assembly and the valve assembly; the oil mixing assembly is communicated with the oil storage assembly through a valve assembly, the oil mixing assembly is connected with the output end of the driving assembly, under the driving of the driving assembly, a standard oil sample in the oil storage assembly and an insulating oil sample to be diluted are sucked into the oil mixing assembly by the oil mixing assembly, and the diluted insulating oil sample is obtained after repeated mixing, and is stored in the oil storage assembly for oil chromatographic analysis.
As a further improvement of the invention, the oil mixing assembly comprises a first oil cylinder and a second oil cylinder which are communicated with each other, the first oil cylinder is provided with a first piston assembly and a first inlet and outlet, the first piston assembly is connected with the output end of the driving assembly, and the first inlet and outlet is connected with the oil storage assembly; under the drive of the driving assembly, the first piston assembly performs linear reciprocating motion, a standard oil sample and an insulating oil sample to be diluted in the oil storage assembly are sucked into the first oil cylinder through the first inlet and the first outlet, the first oil cylinder and the second oil cylinder are repeatedly mixed to obtain a diluted insulating oil sample, and the diluted insulating oil sample is stored in the oil storage assembly and used for oil chromatographic analysis.
As a further improvement of the invention, the oil storage assembly comprises a first oil reservoir, a second oil reservoir and a third oil reservoir, wherein the first oil reservoir is used for storing a standard oil sample, the second oil reservoir is used for storing an insulating oil sample to be diluted, and the third oil reservoir is used for storing an insulating oil sample after dilution.
As a further improvement of the invention, the valve component comprises a first valve, a second valve, a third valve, a fourth valve and a fifth valve, the first valve is arranged between the first oil storage device and the first inlet and outlet, the second valve is arranged between the second oil storage device and the first inlet and outlet, the third valve is arranged between the third oil storage device and the first inlet and outlet, the fourth valve is connected with the first inlet and outlet and used for realizing cleaning and emptying of the oil mixing component, and the fifth valve is arranged between the first oil cylinder and the second oil cylinder.
As a further improvement of the invention, the oil cylinder further comprises a displacement sensor, and the displacement sensor is used for monitoring the displacement of the first piston assembly so as to realize the monitoring of the oil sample amount in the first oil cylinder.
As a further improvement of the invention, the hydraulic cylinder further comprises a connecting seat, and the connecting seat is used for fixedly connecting the first oil cylinder with the driving assembly.
As a further improvement of the invention, the automatic dilution instrument further comprises a heat dissipation assembly, and the heat dissipation assembly is used for realizing heat exchange between the inside of the automatic dilution instrument and the outside.
As a further improvement of the invention, a control panel is arranged on the side part of the shell, the control panel is electrically connected with the control assembly, and the control panel is used for setting the operation parameters of the automatic dilution instrument.
As a general inventive concept, the present invention also provides an insulating oil sample dilution method for oil chromatography, which is implemented based on the above insulating oil sample automatic dilution instrument for oil chromatography, and comprises the following steps:
s1, injecting a standard oil sample and an insulating oil sample to be diluted into the first oil reservoir and the second oil reservoir respectively, and connecting the first oil reservoir, the second oil reservoir and the third oil reservoir to the front ends of the first valve, the second valve and the third valve respectively;
s2, setting the operation parameters of the automatic dilution instrument on the control panel, wherein the operation parameters comprise: the injection amount, dilution ratio, mixing times, standing time and extraction amount of the diluted insulating oil sample to be diluted;
s3, starting an instrument, opening a second valve, driving a component to rotate in the positive direction to drive a first piston component to move outwards, sucking an insulating oil sample to be diluted in a second oil reservoir into a first oil cylinder by utilizing negative pressure formed inside the first oil cylinder, monitoring the displacement of the first piston component by utilizing a displacement sensor to monitor the injection amount of the insulating oil sample to be diluted in the first oil cylinder, and closing the second valve after the preset injection amount is reached;
s4, opening a first valve, enabling a driving assembly to continuously drive a first piston assembly to move outwards, sucking a standard oil sample in a first oil reservoir into the first oil cylinder by utilizing negative pressure formed inside the first oil cylinder, monitoring the displacement of the first piston assembly by utilizing a displacement sensor to monitor the injection amount of the standard oil sample in the first oil cylinder, and closing the first valve after reaching a preset dilution ratio;
s5, opening a fifth valve, driving the assembly to rotate reversely to drive the first piston assembly to move inwards, pressing the mixed oil sample in the first oil cylinder into the second oil cylinder through the fifth valve, monitoring the displacement of the first piston assembly by using a displacement sensor, driving the assembly to rotate forwardly to drive the first piston assembly to move outwards after the preset displacement is reached, sucking the mixed oil sample in the second oil cylinder into the first oil cylinder through the fifth valve, and repeating the steps to realize mixed dilution of the oil sample;
s6, stopping rotation of the driving assembly after the preset cycle number is reached, and standing the mixed oil sample in the first oil cylinder for 30-60 min to obtain a diluted insulating oil sample;
s7, opening a third valve, driving a first piston assembly to move inwards through a driving assembly, injecting a diluted insulating oil sample in a first oil cylinder into a third oil storage device, monitoring the displacement of the first piston assembly by using a displacement sensor to monitor the output quantity of the diluted insulating oil sample in the first oil cylinder, closing the driving assembly and the third valve after reaching a preset extraction quantity, and using the diluted insulating oil sample in the third oil storage device for oil chromatographic analysis.
As a further improvement of the invention, the method also comprises the following cleaning steps:
s8, cleaning times of the first oil cylinder and the second oil cylinder and the injection amount of the standard oil sample in the first oil cylinder are arranged on the control panel; opening a valve II, driving a piston assembly I to move inwards through a driving assembly, emptying an oil cylinder I, and closing the valve II;
s9, injecting a standard oil sample into the first oil reservoir, connecting the first oil reservoir to the front end of the first valve, opening the first valve, driving the first piston assembly to move outwards by the driving assembly, sucking the standard oil sample in the first oil reservoir into the first oil cylinder by utilizing negative pressure formed inside the first oil cylinder, monitoring the displacement of the first piston assembly by utilizing a displacement sensor so as to monitor the injection amount of the standard oil sample in the first oil cylinder, and closing the first valve after reaching a preset injection amount;
s10, opening a fifth valve, driving the assembly to rotate reversely to drive the first piston assembly to move inwards, pressing a standard oil sample in the first oil cylinder into the second oil cylinder through the fifth valve, monitoring the displacement of the first piston assembly by using a displacement sensor, driving the assembly to rotate forwardly to drive the first piston assembly to move outwards after reaching a preset displacement, sucking the standard oil sample in the second oil cylinder into the first oil cylinder through the fifth valve, and repeating the steps to realize the cleaning of the first oil cylinder and the second oil cylinder; after the preset cleaning times are reached, opening a fourth valve, driving a first piston assembly to move inwards through a driving assembly, discharging a cleaning oil sample in a first oil cylinder, and then closing the fourth valve;
and S11, repeating the steps S9 and S10 for 3-5 times to complete the cleaning of the first oil cylinder and the second oil cylinder.
Compared with the prior art, the invention has the advantages that:
1. according to the automatic insulating oil sample diluter for oil chromatographic analysis, the oil mixing component is respectively connected with the driving component and the oil storage component, the valve component is arranged between the oil mixing component and the oil storage component, and the driving component and the valve component are controlled by the control component, so that the automatic insulating oil sample diluter has the advantages of compact structure and high automation degree. Under drive assembly's drive, the oil mixing assembly with the interior standard oil appearance of oil storage assembly with wait to dilute in the insulating oil appearance inhales the oil mixing assembly, and obtain diluting the back insulating oil appearance after mixing repeatedly, dilute the back insulating oil appearance and deposit in the oil storage assembly, not only the accurate control oil appearance volume, realized oil appearance injection moreover, the automation that oil appearance mixes and oil appearance discharges, also saved the manpower by a wide margin when reducing human error, improved detection efficiency.
2. According to the automatic insulating oil sample diluter for oil chromatographic analysis, the first oil cylinder and the second oil cylinder are arranged and communicated with each other, the piston assembly of the first oil cylinder is connected with the output end of the driving assembly, and the displacement sensor is arranged to monitor the displacement of the piston assembly in real time so as to monitor the change of the oil sample amount in the first oil cylinder, so that the accuracy of oil sample volume control is greatly improved, and the accuracy of an oil chromatographic analysis result is improved. Under the drive of the driving assembly, the first piston assembly performs linear reciprocating motion, and a mixed oil sample consisting of a standard oil sample and an insulating oil sample to be diluted is repeatedly alternated between the first oil cylinder and the second oil cylinder, so that the automatic uniform mixing of the oil sample is realized, and the mixing and diluting efficiency of the oil sample is greatly improved. Meanwhile, the automatic dilution instrument also has the function of automatic cleaning, so that the labor is saved, the mutual pollution among different oil samples is avoided, and the accuracy of the oil chromatographic analysis result is improved.
3. According to the insulating oil sample diluting method for oil chromatographic analysis, relevant parameters of operation of an automatic diluting instrument are set on a control panel, under program control, an insulating oil sample to be diluted and a standard oil sample are injected into a first oil cylinder according to a preset sequence, alternate mixing is carried out between the first oil cylinder and a second oil cylinder, and the diluted insulating oil sample is automatically stored in a third oil reservoir for oil chromatographic analysis test.
Drawings
FIG. 1 is a schematic diagram of the three-dimensional structure of the automatic diluting instrument for the oil chromatographic analysis of the present invention.
FIG. 2 is a schematic diagram of the internal structure of the automatic diluting instrument for an insulating oil sample for oil chromatographic analysis according to the present invention.
FIG. 3 is a schematic diagram of the principle of the top view of the internal structure of the automatic dilution instrument for oil chromatographic analysis.
FIG. 4 is a schematic diagram of the control principle of the automatic dilution instrument for oil chromatographic analysis according to the present invention.
FIG. 5 is a second schematic diagram illustrating the control principle of the automatic dilution instrument for oil chromatographic analysis according to the present invention.
FIG. 6 is a third schematic diagram of the control principle of the automatic diluting instrument for oil chromatographic analysis according to the present invention.
FIG. 7 is a fourth schematic view showing the control principle of the automatic diluting instrument for an insulating oil sample for oil chromatography according to the present invention.
FIG. 8 is a fifth schematic view showing the control principle of the automatic diluting instrument for an insulating oil sample for oil chromatography according to the present invention.
FIG. 9 is a sixth schematic view showing the control principle of the automatic diluting instrument for an insulating oil sample for oil chromatography according to the present invention.
Illustration of the drawings: 1. a first oil cylinder; 101. a piston assembly; 102. a first entrance and exit; 2. a second oil cylinder; 201. a piston assembly number two; 202. a second entrance; 3. a drive assembly; 4. a valve assembly; 41. a first valve; 42. a second valve; 43. a third valve; 44. a valve number four; 45. a valve No. five; 5. an oil storage assembly; 51. a first oil reservoir; 52. a second oil reservoir; 53. a third oil reservoir; 6. a displacement sensor; 7. a connecting seat; 8. a heat dissipating component; 9. a control component; 10. a housing; 11. a top plate; 12. mounting a bottom plate; 13. a control panel.
Detailed Description
The invention is further described below with reference to the drawings and specific preferred embodiments of the description, without thereby limiting the scope of protection of the invention.
Example 1
As shown in fig. 1 to 4, the automatic diluting instrument for an insulating oil sample for oil chromatography according to the present invention includes: shell 10, the inside mounting plate 12 that is equipped with of shell 10, oil mixing component, drive assembly 3, valve component 4 and control assembly 9 all set up on mounting plate 12, and shell 10 top is equipped with roof 11, and oil storage component 5 sets up on roof 11. The oil mixing component is used for realizing mixing and dilution of a standard oil sample and an insulating oil sample to be diluted. The oil storage assembly 5 is used for storing a standard oil sample, an insulating oil sample to be diluted and an insulating oil sample after dilution, the standard oil sample is an oil sample which does not contain any characteristic gas and has the same type as insulating oil in oil-filled electrical equipment, and the insulating oil sample to be diluted is an insulating oil sample extracted from the oil-filled electrical equipment. A control panel 13 is arranged on the side of the shell 10, the control panel 13 is electrically connected with the control assembly 9, and the control panel 13 is used for setting the operation parameters of the automatic dilution instrument. The control assembly 9 is used for controlling the opening and closing of the driving assembly 3 and the valve assembly 4 so as to realize the automation of oil inlet, oil mixing and oil discharge in the oil mixing assembly. The oil mixing component is communicated with the oil storage component 5 through the valve component 4, the oil mixing component is connected with the output end of the driving component 3, under the driving of the driving component 3, a standard oil sample in the oil storage component 5 and an insulating oil sample to be diluted are sucked into the oil mixing component by the oil mixing component, the oil mixing component repeatedly mixes the standard oil sample and the insulating oil sample to be diluted to obtain the diluted insulating oil sample, and the diluted insulating oil sample is stored in the oil storage component 5 and used for oil chromatographic analysis. It can be understood that, in this embodiment, the driving assembly 3 may specifically adopt a penetration stepping motor, and has the advantages of stable transmission and accurate control. In other embodiments, the driving assembly 3 may also adopt other driving members, such as a cylinder, a servo motor, etc., as long as it can realize the oil inlet amount and the oil discharge amount of the oil mixing assembly accurately controlled, and realize the stable and uniform mixing of the oil sample.
In this embodiment, through being connected oil mixing assembly with drive assembly 3 and oil storage assembly 5 respectively, set up valve member 4 between oil mixing assembly and oil storage assembly 5 to control drive assembly 3 and valve member 4 through control assembly 9, have compact structure, advantage that degree of automation is high. Under drive assembly 3's drive, the contaminated product subassembly is with the standard oil appearance in the oil storage subassembly 5 and wait to dilute in the contaminated product subassembly is inhaled to the insulating oil appearance of dilution to obtain the insulating oil appearance after mixing repeatedly, dilute the back insulating oil appearance and deposit in the oil storage subassembly, not only the accurate control oil appearance volume, realized oil appearance injection moreover, the automation that oil appearance mixes and oil appearance discharges, the manpower has also been saved by a wide margin when reducing human error, detection efficiency is improved.
In this embodiment, the oil mixing assembly includes a first oil cylinder 1 and a second oil cylinder 2 that are communicated with each other, and the maximum volume of the first oil cylinder 1 and the second oil cylinder 2 is 120 mL. A first piston assembly 101 and a first inlet and outlet 102 are arranged on a first oil cylinder 1, a second piston assembly 201 and a second inlet and outlet 102 are arranged on a second oil cylinder 2, a second piston 202 is not connected with a driving assembly 3, the displacement of the second piston 202 is limited by the oil sample amount in the second oil cylinder 2, and the second inlet and outlet 102 serves as a spare inlet and outlet. The first piston assembly 101 is connected with the output end of the driving assembly 3, and the first inlet and outlet 102 is connected with the oil storage assembly 5. Under the drive of the driving assembly 3, the first piston assembly 101 performs linear reciprocating motion, a standard oil sample and an insulating oil sample to be diluted in the oil storage assembly 5 are sucked into the first oil cylinder 1 through the first inlet and outlet 102, the standard oil sample and the insulating oil sample to be diluted are repeatedly mixed between the first oil cylinder 1 and the second oil cylinder 2 to obtain a diluted insulating oil sample, and the diluted insulating oil sample is stored in the oil storage assembly 5 and used for oil chromatographic analysis. It can be understood that the diluted insulating oil sample can also be temporarily stored in the first oil cylinder 1, and when an oil chromatographic analysis test is required, the diluted insulating oil sample is stored in the oil storage assembly 5 so as to facilitate the test analysis. In other embodiments, the first oil cylinder 1 and the second oil cylinder 2 can also be other forms of variable-volume oil-resistant containers, the maximum volume of the first oil cylinder 1 and the second oil cylinder 2 can also be adjusted according to actual application requirements, and the standard oil sample and the insulating oil sample to be diluted can also be mixed in a stirring or oscillation mode.
In this embodiment, the oil storage assembly 5 includes a first oil reservoir 51, a second oil reservoir 52 and a third oil reservoir 53, the first oil reservoir 51 is used for storing a standard oil sample, the second oil reservoir 52 is used for storing an insulating oil sample to be diluted, and the third oil reservoir 53 is used for storing an insulating oil sample after dilution. It can be understood that, in this embodiment, the first oil reservoir 51, the second oil reservoir 52 and the third oil reservoir 53 all adopt the form of syringes, and the maximum volume of the syringe is 100mL, so that the syringe has the advantages of convenient sampling and easy reading of the volume of the oil sample, and meanwhile, the syringe also has certain sealing performance, so as to avoid leakage of the oil sample. It is understood that in other embodiments, the first oil reservoir 51, the second oil reservoir 52 and the third oil reservoir 53 may be other types of oil-resistant containers with variable volumes, and the volumes of the oil reservoirs may be adjusted according to actual application requirements.
In this embodiment, the valve assembly 4 includes a first valve 41, a second valve 42, a third valve 43, a fourth valve 44, and a fifth valve 45. A first valve 41 is arranged between the first oil storage device 51 and the first inlet and outlet 102, and standard oil samples are injected into the first oil cylinder 1 by controlling the opening and closing of the first valve 41. A second valve 42 is arranged between the second oil reservoir 52 and the first inlet and outlet 102, and the insulating oil sample to be diluted is injected into the first oil cylinder 1 by controlling the opening and closing of the second valve 42. A third valve 43 is arranged between the third oil reservoir 53 and the first inlet and outlet 102, and the diluted insulating oil sample is injected into the third oil reservoir 53 by controlling the opening and closing of the third valve 43. The fourth valve 44 is connected with the first inlet and outlet 102, and the excessive oil sample in the first oil cylinder 1 is discharged by controlling the opening and closing of the fourth valve 44, so that the cleaning and emptying of the oil mixing assembly are realized. A fifth valve 45 is arranged between the first oil cylinder 1 and the second oil cylinder 2 and used for realizing the alternate mixing of the mixed oil sample between the two oil cylinders. It can be understood that, in the present embodiment, the first valve 41, the second valve 42, the third valve 43, the fourth valve 44, and the fifth valve 45 all have electromagnetic valves, so as to improve the control accuracy. In other embodiments, the valve assembly may also adopt other controllable or non-controllable valves as long as the precise control of oil feeding and oil discharging can be realized.
In this embodiment, still include displacement sensor 6, displacement sensor 6 sets up the lateral part at hydro-cylinder 1 for the displacement volume of monitoring piston assembly 101, in order to realize the monitoring of the oil appearance volume in hydro-cylinder 1, improve the precision of oil appearance volume control.
In this embodiment, through setting up a hydro-cylinder 1 and No. two hydro-cylinders 2 that communicate each other, the piston assembly of a hydro-cylinder 1 is connected with drive assembly 3's output to set up displacement sensor 6 and come real-time supervision piston assembly's displacement volume, changed with the oil appearance volume of monitoring in hydro-cylinder 1, improved the precision of oil appearance volume control greatly, improved the degree of accuracy of oil chromatography analysis result. Under the drive of the driving assembly 3, the first piston assembly 101 performs linear reciprocating motion, and a mixed oil sample consisting of a standard oil sample and an insulating oil sample to be diluted is repeatedly alternated between the first oil cylinder 1 and the second oil cylinder 2, so that the automatic uniform mixing of the oil sample is realized, and the mixing and diluting efficiency of the oil sample is greatly improved. Meanwhile, the automatic dilution instrument also has the function of automatic cleaning, so that the labor is saved, the mutual pollution among different oil samples is avoided, and the accuracy of the oil chromatographic analysis result is improved.
In this embodiment, the hydraulic cylinder driving device further comprises a connecting seat 7, and the connecting seat 7 is used for fixedly connecting the first oil cylinder 1 and the driving assembly 3. Through the connection effect of connecting seat 7, improve the stability of being connected between 1 hydro-cylinder and the drive assembly 3 to improve driven stability, improve the control precision of 1 oil feed of a hydro-cylinder and oil extraction.
In this embodiment, still include radiator unit 8, radiator unit 8 is used for realizing that the inside and external heat exchange that carries on of automatic dilution appearance avoids appearing the inside overheated phenomenon of instrument to improve the stability in use and the life-span of instrument.
Example 2
The invention discloses an insulating oil sample diluting method for oil chromatographic analysis, which is realized based on the insulating oil sample automatic diluting instrument for oil chromatographic analysis and comprises the following steps:
s1, injecting 100mL of standard oil sample into the first oil reservoir 51, injecting 20mL of insulating oil sample to be diluted into the second oil reservoir 52, and respectively connecting the first oil reservoir 51, the second oil reservoir 52 and the third oil reservoir 53 to the front ends of the first valve 41, the second valve 42 and the third valve 43. The specific control principle is shown in fig. 5.
S2, setting the operation parameters of the automatic dilution instrument on the control panel 13, wherein the injection amount of the insulating oil sample to be diluted is 20mL, the dilution ratio is 5: 1, namely the standard oil sample is 100mL, the mixing frequency is 50 times, the standing time is 30min, and the extraction amount of the diluted insulating oil sample is 60 mL. It can be understood that the operation parameters of the automatic dilution instrument can be flexibly adjusted according to actual requirements.
S3, starting an instrument, wherein the control component 9 controls the second valve 42 to be opened, the driving component 3 rotates in the positive direction to drive the first piston component 101 to move outwards, the negative pressure formed inside the first oil cylinder 1 is utilized to suck the insulating oil sample to be diluted in the second oil reservoir 52 into the first oil cylinder 1, meanwhile, the displacement sensor 6 is utilized to monitor the displacement of the first piston component 101 so as to monitor the injection amount of the insulating oil sample to be diluted in the first oil cylinder 1, after the preset injection amount of 20mL is reached, the control component 9 controls the second valve 42 to be closed, and the driving component 3 stops rotating temporarily. The specific control principle is shown in fig. 6.
S4, the control component 9 controls the first valve 41 to be opened, the driving component 3 continues to drive the first piston component 101 to move outwards, the negative pressure formed inside the first oil cylinder 1 is used for sucking the standard oil sample in the first oil reservoir 51 into the first oil cylinder 1, meanwhile, the displacement of the first piston component 101 is monitored by the displacement sensor 6 so as to monitor the injection amount of the standard oil sample in the first oil cylinder 1, after the preset dilution ratio of 5: 1 is reached, namely when the injection amount of the standard oil sample reaches 100mL, the control component 9 controls the first valve 41 to be closed, and the driving component 3 stops rotating. The specific control principle is shown in fig. 7.
S5, the control component 9 controls the opening of the fifth valve 5, the driving component 3 rotates reversely to drive the first piston component 101 to move inwards, the mixed oil sample in the first oil cylinder 1 is pressed into the second oil cylinder 2 through the fifth valve 45, meanwhile, the displacement sensor 6 is utilized to monitor the displacement of the first piston component 101, after the preset displacement is reached, the mixed oil sample in the first oil cylinder 1 completely enters the second oil cylinder 2, the driving component 3 rotates forwards to drive the first piston component 101 to move outwards, the mixed oil sample in the second oil cylinder 2 is sucked into the first oil cylinder 1 through the fifth valve 45, and the oil sample is mixed and diluted through repeated circulation. The specific control principle is shown in fig. 8.
And S6, stopping the rotation of the driving assembly 3 after the preset circulation times are reached, and standing the mixed oil sample in the first oil cylinder 1 for 30min to obtain the diluted insulating oil sample. In order to improve the standing effect, in other embodiments, the mixed oil sample may also be allowed to stand in the first oil cylinder 1 for 60 min.
S7, the control component 9 controls the third valve 43 to be opened, the diluted insulating oil sample in the first oil cylinder 1 is injected into the third oil storage device 53 through the driving component 3, meanwhile, the displacement of the first piston component 101 is monitored by the displacement sensor 6 to monitor the output quantity of the diluted insulating oil sample in the first oil cylinder 1, after the preset extraction quantity of 60mL is reached, the driving component 3 and the third valve 43 are closed, and the diluted insulating oil sample in the third oil storage device 53 is used for oil chromatographic analysis. The specific control principle is shown in fig. 9. It can be understood that the diluted insulating oil sample may also be temporarily stored in the first oil cylinder 1, and when the oil chromatographic analysis is required, the diluted insulating oil sample is injected into the third oil reservoir 53.
Further, in this embodiment, the method further includes the following cleaning steps:
s8, cleaning times of the first oil cylinder 1 and the second oil cylinder 2 are set on the control panel 13 to be 30 times, and the injection amount of the standard oil sample in the first oil cylinder 1 is 100 mL; and opening the fourth valve 44, driving the first piston assembly 101 to move inwards through the driving assembly 3, emptying the first oil cylinder 1, and closing the fourth valve 44. It can be understood that the cleaning operation parameters of the automatic dilution instrument can be flexibly adjusted according to actual requirements.
S9, injecting 100mL of standard oil sample into the first oil reservoir 51, and connecting the first oil reservoir 51 with the front end of the first valve 41; the first valve 41 is opened, the driving assembly 3 drives the first piston assembly 101 to move outwards, a standard oil sample in the first oil reservoir 51 is sucked into the first oil cylinder 1 by utilizing negative pressure formed inside the first oil cylinder 1, meanwhile, the displacement of the first piston assembly 101 is monitored by utilizing the displacement sensor 6 so as to monitor the injection amount of the standard oil sample in the first oil cylinder 1, and the first valve 41 is closed after the preset 100mL injection amount is reached.
S10, opening a fifth valve 5, driving the assembly 3 to rotate reversely to drive the first piston assembly 101 to move inwards, pressing a standard oil sample in the first oil cylinder 1 into the second oil cylinder 2 through the fifth valve 45, monitoring the displacement of the first piston assembly 101 by using the displacement sensor 6, after reaching a preset displacement, driving the assembly 3 to rotate forwardly to drive the first piston assembly 101 to move outwards, sucking the standard oil sample in the second oil cylinder 2 into the first oil cylinder 1 through the fifth valve 45, and repeating the steps to clean the first oil cylinder 1 and the second oil cylinder 2; after the preset time of 30 times, the fourth valve 44 is opened, the first piston assembly 101 is driven to move inwards through the driving assembly 3, the cleaning oil sample in the first oil cylinder 1 is discharged, and then the fourth valve 44 is closed.
And S11, repeating the steps S9 and S10 for 3 times, and finishing the cleaning of the first oil cylinder 1 and the second oil cylinder 2. It is understood that, in other embodiments, the number of times of repeating steps S9 and S10 may also be set to 4 or 5, as long as the cleaning of the first oil cylinder 1 and the second oil cylinder 2 can be achieved, and the subsequent dilution of the oil sample is not affected.
In the embodiment, by setting relevant parameters of the operation of the automatic dilution instrument on the control panel 13, under program control, the insulating oil sample to be diluted and the standard oil sample are injected into the first oil cylinder 1 according to a preset sequence, and are alternately mixed between the first oil cylinder 1 and the second oil cylinder 2, and the diluted insulating oil sample is automatically stored in the third oil reservoir 53 for oil chromatographic analysis test. After the diluted insulating oil samples are taken, automatic cleaning operation of the instrument can be performed, labor is saved, cleanliness of the instrument is improved, and the problem that mutual pollution among different oil samples affects the result of oil chromatographic analysis is avoided.
Although the present invention has been described with reference to the preferred embodiments, it is not intended to be limited thereto. Those skilled in the art can make many possible variations and modifications to the disclosed embodiments, or equivalent modifications, without departing from the spirit and scope of the invention, using the methods and techniques disclosed above. Therefore, any simple modification, equivalent replacement, equivalent change and modification made to the above embodiments according to the technical essence of the present invention are still within the scope of the protection of the technical solution of the present invention.
Claims (10)
1. The utility model provides an automatic appearance that dilutes of insulating oil sample for oil chromatographic analysis which characterized in that includes: the oil mixing device comprises a shell (10), wherein an oil mixing component, a driving component (3), a valve component (4) and a control component (9) are arranged in the shell (10), and an oil storage component (5) is arranged at the top of the shell (10); the oil mixing assembly is used for mixing and diluting a standard oil sample and an insulating oil sample to be diluted, the oil storage assembly (5) is used for storing the standard oil sample, the insulating oil sample to be diluted and the diluted insulating oil sample, and the control assembly (9) is used for controlling the opening and closing of the driving assembly (3) and the valve assembly (4); the oil mixing assembly is communicated with the oil storage assembly (5) through a valve assembly (4), the oil mixing assembly is connected with the output end of the driving assembly (3), under the driving of the driving assembly (3), a standard oil sample and an insulating oil sample to be diluted in the oil storage assembly (5) are sucked into the oil mixing assembly by the oil mixing assembly, and the oil mixing assembly is repeatedly mixed to obtain the insulating oil sample after dilution, and the insulating oil sample after dilution is stored in the oil storage assembly (5) and is used for oil chromatographic analysis.
2. The automatic insulating oil sample diluter for oil chromatographic analysis according to claim 1, wherein the oil mixing component comprises a first oil cylinder (1) and a second oil cylinder (2) which are communicated with each other, the first oil cylinder (1) is provided with a first piston component (101) and a first inlet and outlet (102), the first piston component (101) is connected with the output end of the driving component (3), and the first inlet and outlet (102) is connected with the oil storage component (5); under the drive of the driving assembly (3), the first piston assembly (101) performs linear reciprocating motion, a standard oil sample and an insulating oil sample to be diluted in the oil storage assembly (5) are sucked into the first oil cylinder (1) through the first inlet and outlet (102), the first oil cylinder (1) and the second oil cylinder (2) are repeatedly mixed to obtain a diluted insulating oil sample, and the diluted insulating oil sample is stored in the oil storage assembly (5) and used for oil chromatographic analysis.
3. The automatic diluting instrument for the insulating oil sample for the oil chromatographic analysis is characterized in that the oil storage component (5) comprises a first oil storage device (51), a second oil storage device (52) and a third oil storage device (53), wherein the first oil storage device (51) is used for storing a standard oil sample, the second oil storage device (52) is used for storing an insulating oil sample to be diluted, and the third oil storage device (53) is used for storing an insulating oil sample after dilution.
4. The automatic diluting instrument for the insulating oil sample for the oil chromatographic analysis is characterized in that the valve component (4) comprises a first valve (41), a second valve (42), a third valve (43), a fourth valve (44) and a fifth valve (45), the first valve (41) is arranged between the first oil storage device (51) and the first inlet and outlet (102), the second valve (42) is arranged between the second oil storage device (52) and the first inlet and outlet (102), the third valve (43) is arranged between the third oil storage device (53) and the first inlet and outlet (102), the fourth valve (44) is connected with the first inlet and outlet (102) and used for cleaning and emptying the oil mixing component, and the fifth valve (45) is arranged between the first oil cylinder (1) and the second oil cylinder (2).
5. The automatic insulating oil sample diluter for oil chromatography according to any one of claims 2 to 4, further comprising a displacement sensor (6), wherein the displacement sensor (6) is used for monitoring the displacement of the first piston assembly (101) to realize the monitoring of the oil sample amount in the first oil cylinder (1).
6. The automatic diluting instrument for the insulating oil sample for the oil chromatographic analysis according to any one of claims 2 to 4, characterized by further comprising a connecting seat (7), wherein the connecting seat (7) is used for fixedly connecting the first oil cylinder (1) with the driving assembly (3).
7. The automatic dilution instrument for the oil chromatographic analysis according to any one of claims 2 to 4, further comprising a heat dissipation assembly (8), wherein the heat dissipation assembly (8) is used for realizing heat exchange between the inside of the automatic dilution instrument and the outside.
8. The automatic diluting instrument for the oil chromatographic analysis, which is characterized in that a control panel (13) is arranged on the side of the casing (10), the control panel (13) is electrically connected with the control component (9), and the control panel (13) is used for setting the operating parameters of the automatic diluting instrument.
9. An insulating oil sample diluting method for oil chromatographic analysis, which is realized based on the insulating oil sample automatic diluter for oil chromatographic analysis of any one of claims 1 to 8, and is characterized by comprising the following steps:
s1, respectively injecting a standard oil sample and an insulating oil sample to be diluted into the first oil reservoir (51) and the second oil reservoir (52), and respectively connecting the first oil reservoir (51), the second oil reservoir (52) and the third oil reservoir (53) to the front ends of the first valve (41), the second valve (42) and the third valve (43);
s2, setting the operation parameters of the automatic dilution instrument on the control panel (13), wherein the operation parameters comprise: the injection amount, dilution ratio, mixing times, standing time and extraction amount of the diluted insulating oil sample to be diluted;
s3, starting an instrument, opening a second valve (42), driving a component (3) to rotate in the positive direction to drive a first piston component (101) to move outwards, sucking an insulating oil sample to be diluted in a second oil storage device (52) into the first oil cylinder (1) by using negative pressure formed inside the first oil cylinder (1), monitoring the displacement of the first piston component (101) by using a displacement sensor (6) to monitor the injection amount of the insulating oil sample to be diluted in the first oil cylinder (1), and closing the second valve (42) after the preset injection amount is reached;
s4, opening a first valve (41), continuously driving a first piston assembly (101) to move outwards by a driving assembly (3), sucking a standard oil sample in a first oil storage device (51) into the first oil cylinder (1) by using negative pressure formed inside the first oil cylinder (1), monitoring the displacement of the first piston assembly (101) by using a displacement sensor (6) to monitor the injection amount of the standard oil sample in the first oil cylinder (1), and closing the first valve (41) after reaching a preset dilution ratio;
s5, opening a fifth valve (5), reversely rotating a driving assembly (3) to drive a first piston assembly (101) to move inwards, pressing a mixed oil sample in a first oil cylinder (1) into a second oil cylinder (2) through the fifth valve (45), monitoring the displacement of the first piston assembly (101) by using a displacement sensor (6), after reaching a preset displacement, forwardly rotating the driving assembly (3) to drive the first piston assembly (101) to move outwards, sucking the mixed oil sample in the second oil cylinder (2) into the first oil cylinder (1) through the fifth valve (45), and repeatedly circulating to realize mixing and dilution of the oil sample;
s6, stopping rotation of the driving assembly (3) after the preset cycle number is reached, and standing the mixed oil sample in the first oil cylinder (1) for 30-60 min to obtain a diluted insulating oil sample;
s7, a third valve (43) is opened, a first piston assembly (101) is driven to move inwards through a driving assembly (3), a diluted insulating oil sample in a first oil cylinder (1) is injected into a third oil storage device (53), meanwhile, the displacement of the first piston assembly (101) is monitored by a displacement sensor (6), the output quantity of the diluted insulating oil sample in the first oil cylinder (1) is monitored, after the preset extraction quantity is reached, the driving assembly (3) and the third valve (43) are closed, and the diluted insulating oil sample in the third oil storage device (53) is used for oil chromatographic analysis.
10. The method for diluting an insulating oil sample for oil chromatographic analysis according to claim 9, further comprising the following washing steps:
s8, arranging the cleaning times of the first oil cylinder (1) and the second oil cylinder (2) and the injection amount of the standard oil sample in the first oil cylinder (1) on the control panel (13); opening a fourth valve (44), driving a first piston assembly (101) to move inwards through a driving assembly (3), emptying the first oil cylinder (1), and closing the fourth valve (44);
s9, injecting a standard oil sample into the first oil storage device (51), connecting the first oil storage device (51) to the front end of the first valve (41), opening the first valve (41), driving the first piston assembly (101) to move outwards by the driving assembly (3), sucking the standard oil sample in the first oil storage device (51) into the first oil cylinder (1) by using negative pressure formed inside the first oil cylinder (1), monitoring the displacement of the first piston assembly (101) by using the displacement sensor (6) to monitor the injection amount of the standard oil sample in the first oil cylinder (1), and closing the first valve (41) after reaching a preset injection amount;
s10, opening a fifth valve (5), reversely rotating a driving assembly (3) to drive a first piston assembly (101) to move inwards, pressing a standard oil sample in a first oil cylinder (1) into a second oil cylinder (2) through the fifth valve (45), monitoring the displacement of the first piston assembly (101) by using a displacement sensor (6), after reaching a preset displacement, forwardly rotating the driving assembly (3) to drive the first piston assembly (101) to move outwards, sucking the standard oil sample in the second oil cylinder (2) into the first oil cylinder (1) through the fifth valve (45), and repeatedly circulating to realize cleaning of the first oil cylinder (1) and the second oil cylinder (2); after the preset cleaning times are reached, opening a fourth valve (44), driving a first piston assembly (101) to move inwards through a driving assembly (3), discharging a cleaning oil sample in a first oil cylinder (1), and then closing the fourth valve (44);
and S11, repeating the steps S9 and S10 for 3-5 times to finish cleaning the first oil cylinder (1) and the second oil cylinder (2).
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