Device for measuring oxidation stability of fraction fuel oil

Abstract

The invention relates to the technical field of fraction fuel oil detection and analysis, in particular to a fraction fuel oil oxidation stability measuring device which comprises a cabinet body and a plurality of sample tubes, a bath heating cavity is formed in the cabinet body, a plurality of insertion holes communicated with the bath heating cavity are formed in the cabinet body, and the sample tubes can penetrate through the insertion holes in a matched mode to be inserted into the bath heating cavity. An annular flexible connecting body is fixed on the inner wall of each bath heating cavity, an annular air bag is fixed on the inner edge wall of each flexible connecting body, and a clamping part for clamping the annular air bag when the annular air bag is inflated and expanded is arranged on the outer wall of the sample tube. Through linkage cooperation of the driving mechanism, the shaking assisting mechanism and the pushing linkage mechanism, the supporting plate is driven to conduct composite offset in the horizontal direction and the vertical direction, the sample pipe can be driven to synchronously conduct multi-dimensional shaking, the jolting and shaking working conditions of fuel oil in the actual transportation process are simulated, and the test efficiency is improved. Therefore, the environmental condition of the accelerated oxidation test is closer to a real scene, the evaluation deviation is reduced, and the prediction value of the measurement result on the actual storage and transportation stability is improved.

Description

Technical Field

[0001] This invention relates to the field of distillate fuel oil detection and analysis technology, specifically to a device for determining the oxidation stability of distillate fuel oil. Background Technology

[0002] The oxidation stability test for distillate fuel oil is a laboratory test method that assesses the resistance of fuel oil to oxidative deterioration and sediment formation during storage and transportation by accelerating the oxidation process. Typically, a certain amount of filtered oil sample is placed in a specific oxidation tube, and oxygen is introduced at a constant temperature for a certain period of time to induce an oxidation reaction. After the reaction is complete, the oxidation stability of the fuel oil is quantitatively evaluated by measuring the mass of the total insoluble matter produced.

[0003] In existing distillate fuel oil oxidation stability testing devices, most sample tubes are statically arranged, making it impossible to apply vibration to the sample tubes to simulate the shaking during transportation, resulting in deviations between the evaluation results and actual operating conditions. Even if some devices are equipped with a stirring structure, the stirring paddle directly penetrates into the oil sample, and the strong shearing action will destroy the oil sample components. Furthermore, the frictional heat generated will interfere with the natural process of the oxidation reaction, affecting the accuracy of the test. The above-mentioned defects reduce the value of this method in practical simulation and prediction. Summary of the Invention

[0004] The purpose of this invention is to provide an apparatus for measuring the oxidation stability of distillate fuel oil to solve the technical problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution.

[0006] An apparatus for determining the oxidation stability of distillate fuel oil includes a cabinet and several sample tubes. The cabinet contains a heating chamber, and the cabinet has several insertion holes communicating with the heating chamber. The sample tubes can be inserted into the heating chamber through the insertion holes. Each heating chamber has an annular flexible connector fixed to its inner wall, and an annular air bladder is fixed to the inner edge of each flexible connector. The outer wall of the sample tube has an annular groove for the annular air bladder to be inflated and engaged. A support plate for supporting the bottom of each sample tube is installed in the cabinet via a swaying mechanism. The cabinet has a drive mechanism that works in conjunction with the swaying mechanism via a pushing linkage mechanism to move the support plate up, down, left, and right. A stirring mechanism is located at the bottom of the heating chamber and works in conjunction with the drive mechanism to stir the hot medium within the heating chamber.

[0007] Preferably, two adjacent annular airbags are connected by air guide tubes; one of the annular airbags is connected to an inflation / deflation tube, which extends to the outside of the cabinet and is connected to an external inflation / deflation device.

[0008] Preferably, the swaying mechanism includes a slide rod, a guide rod, and an arc-shaped ramp; a slide rail extending laterally is fixed to the bottom wall of the heating chamber, a slide seat is slidably installed on the upper limit of the slide rail, and an inverted L-shaped bracket is fixed to the top of the slide seat; a vertically penetrating sliding hole is opened at the top of the bracket, and the slide rod is slidably installed through the sliding hole; the arc-shaped ramp is fixed to the bottom wall of the heating chamber and located on one side of the slide rail, the arc-shaped ramp extends laterally, and is high in the middle and low on both sides; a roller that presses against the top surface of the arc-shaped ramp is installed at the bottom end of the slide rod; the guide rod is fixed through the bracket and extends laterally; one end of the guide rod is rounded and serves as a pressure-bearing end, pressing against the pushing linkage mechanism, and the other end of the guide rod slides through and extends to the outside of the cabinet, and is connected to the outer wall of the cabinet through an elastic reset structure; a support plate is fixedly installed on the top of the slide rod.

[0009] Preferably, the elastic reset structure includes a mounting bracket, a mounting plate, and a spring; the mounting bracket is horizontally L-shaped, with one end fixed to the outer wall of the cabinet and the other end having a through-hole; the guide rod slides through the hole, and the mounting plate is fixed to the outer wall of the annular airbag located outside the cabinet; the spring is sleeved on the outside of the guide rod, with one end fixed to the mounting plate and the other end fixed to the mounting bracket; when the guide rod moves due to the pressure of the pushing linkage mechanism, the spring is compressed and stores force.

[0010] Preferably, the drive mechanism includes a drive motor and a main shaft; a motor frame is fixed on the cabinet, and the drive motor is fixed on the motor frame; the main shaft is fixed on the output shaft of the drive motor and extends vertically downwards into the bathing chamber.

[0011] Preferably, the pushing linkage mechanism includes a second rotating shaft and a pushing wheel; a bottom cavity is provided inside the cabinet below the bathing chamber, and the bottom end of the main shaft extends through into the bottom cavity; the second rotating shaft is vertically rotatably mounted on the bottom wall of the bathing chamber, and the bottom end of the second rotating shaft extends through into the bottom cavity; the bottom end of the main shaft and the bottom end of the second rotating shaft are connected by a pulley group for transmission; the pushing wheel is fixed on the top end of the second rotating shaft and maintains a positional correspondence with the guide rod; the circumferential side wall of the pushing wheel has an arc-shaped protrusion, and the arc-shaped protrusion is pressed and engaged with the pressure-bearing end of the guide rod.

[0012] Preferably, the mounting bracket has a vertical insertion hole, and the insertion hole is in communication with the orifice; a pin is movably inserted into the insertion hole; a limiting hole is provided on the outer wall of the guide rod, and when the pin is aligned and inserted into the limiting hole, the pressure end of the guide rod does not contact the outer peripheral wall of the push wheel and the arc-shaped protrusion.

[0013] Preferably, the stirring mechanism includes several first rotating shafts and stirring paddles; the first rotating shafts are rotatably installed at intervals on the bottom wall of the bathing chamber, and the bottom ends of each stirring paddle extend vertically downwards into the bottom chamber; each first rotating shaft is equipped with a stirring paddle at its top end; a gear is fixedly mounted on the outer wall of the main shaft located in the bottom chamber, and a gear plate is fixedly mounted on the outer wall of each first rotating shaft located in the bottom chamber, with adjacent gear plates meshing with each other, and the gear meshing with one of the gear plates.

[0014] Preferably, the tray has several through-holes evenly distributed on it; the tray is made of metal material, and each sample tube has a magnet embedded at the bottom that magnetically engages with the tray.

[0015] Preferably, each sample tube is equipped with a cap at the top, and the cap is made of an opaque material; the upper part of the sample tube is also made of an opaque material.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows.

[0017] This invention, through the coordinated operation of a drive mechanism, a swaying mechanism, and a pushing linkage mechanism, drives the pallet to perform a composite offset in the horizontal and vertical directions, which can drive the sample tube to simultaneously perform multi-dimensional shaking, simulating the bumping and shaking conditions of fuel oil during actual transportation. This makes the environmental conditions of accelerated oxidation testing closer to the real scenario, reduces evaluation bias, and improves the predictive value of the test results for the stability of actual storage and transportation.

[0018] When simulating static storage conditions, this invention uses a locking pin to disengage the guide rod from the pushing linkage mechanism, thereby keeping the tray and sample tube stationary. This mechanism allows the device to flexibly switch between two test modes: simulating transport shaking and simulating static storage, enhancing the versatility of the equipment and its adaptability to different test standards or research needs.

[0019] This invention employs a fixing method in which a flexible clamping body, consisting of an annular airbag and a flexible connector, engages with an annular groove on the outer wall of the sample tube. After the annular airbag is inflated, it can fit tightly into the annular groove, achieving stable clamping while its flexibility allows the sample tube to shift within a certain range under the drive of the support plate without causing hard wear on the tube wall. All annular airbags are connected in series through a gas guide tube and controlled by the same inflation / deflation tube, realizing synchronous and rapid inflation / deflation and clamping release of all sample tubes, simplifying the operation process and improving sample loading and unloading efficiency.

[0020] This invention uses a magnet at the bottom of the sample tube. When the bottom of the sample tube is supported on the tray, the magnet magnetically fixes the bottom of the sample tube to the tray to prevent slippage. On the one hand, this ensures that the sample tube can swing synchronously with the tray, achieving effective shaking simulation. On the other hand, it avoids the stirring of the medium by the stirring paddle and causes the sample tube to shake randomly when simulating static placement. Attached Figure Description

[0021] Figure 1 This is a three-dimensional schematic diagram of the overall structure of the present invention;

[0022] Figure 2 for Figure 1 The diagram shows a partial structure.

[0023] Figure 3 for Figure 2 Enlarged schematic diagram of the structure at point A in the middle;

[0024] Figure 4 for Figure 1 One of the schematic diagrams of a partial structural cross-section shown;

[0025] Figure 5 for Figure 1 The second schematic diagram of the partial structural cross-section shown;

[0026] Figure 6 for Figure 5 Enlarged schematic diagram of the structure at point B;

[0027] Figure 7 for Figure 5 Enlarged schematic diagram of the structure at point C;

[0028] Figure 8 for Figure 1 The third schematic diagram of the partial structural cross-section shown;

[0029] Figure 9 This is one of the schematic diagrams of a partial internal structure of the heating chamber in this invention;

[0030] Figure 10 This is the second schematic diagram of a partial internal structure of the heating chamber in this invention;

[0031] Figure 11 for Figure 10 Enlarged schematic diagram of the structure at point D;

[0032] Figure 12 This is a schematic diagram of a partial internal structure of the bottom cavity in this invention.

[0033] In the diagram: 1. Cabinet; 11. Heating chamber; 12. Insertion hole; 13. Bottom cavity; 2. Sample tube; 201. Magnet block; 21. Annular groove; 22. Cover; 3. Air inlet pipe; 4. Drive mechanism; 41. Motor frame; 42. Drive motor; 43. Main shaft; 5. Annular airbag; 51. Flexible connector; 52. Air guide pipe; 53. Inflation / depression pipe; 6. Support plate; 61. Hollowed-out groove; 7. First rotating shaft; 71. Stirring paddle; 72. Gear; 73. 8. Gear plate; 9. Shaking mechanism; 10. Slide rod; 11. Roller; 12. Slide rail; 13. Slide seat; 14. Bracket; 15. Slide hole; 26. Guide rod; 37. Mounting bracket; 48. Orifice; 59. Mounting plate; 60. Spring; 70. Insertion hole; 81. Pin; 82. Limiting hole; 93. Arc-shaped slope; 10. Pushing linkage mechanism; 11. Second rotating shaft; 12. Pushing wheel; 13. Arc-shaped protrusion; 14. Pulley assembly. Detailed Implementation

[0034] The embodiments of the present invention will now be described with reference to the accompanying drawings.

[0035] In the description of the embodiments of the present invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connection" and "installation" should be interpreted broadly, wherein "fixed" means that the devices or elements are connected to each other and their relative positional relationship remains unchanged after connection. The directional terms mentioned in the embodiments of the present invention are only for reference to the directions in the accompanying drawings, and are intended to better and more clearly illustrate and understand the embodiments of the present invention. They are not intended to indicate or imply that the devices or elements referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limitations on the embodiments of the present invention.

[0036] Example 1

[0037] Please see Figures 1-12 This invention provides an apparatus for determining the oxidation stability of distillate fuel oil. The apparatus includes a cabinet 1 and several sample tubes 2. The cabinet 1 is provided with a heating chamber 11 and a bottom chamber 13, with the bottom chamber 13 located below the heating chamber 11. In addition, the apparatus also includes a thermal circulation system, a cold circulation system, and an oxygen supply system. The oxygen supply system is used to supply oxygen into the sample tubes 2. The thermal circulation system is connected to the heating chamber 11 to form a hot water circulation path for heating the sample tubes 2 inserted into the heating chamber 11. The thermal circulation system includes a temperature controller and a heating element. The temperature controller controls the heating element to regulate the water bath temperature to meet the actual measurement needs. The cold circulation system is also connected to the heating chamber 11 for cooling the sample. All of the above systems adopt existing technology. Each system is equipped with corresponding valves and pressure gauges. The specific structure and working principle are not described in detail, and the specific structure of each system is not shown in the accompanying drawings of this application.

[0038] The cabinet 1 has six insertion holes 12 that communicate with the heating chamber 11, ensuring that six samples can be measured simultaneously. The sample tube 2 can be matched and passed through the insertion holes 12 and inserted into the heating chamber 11. Unlike the prior art, each heating chamber 11 has an annular flexible connector 51 fixed on its inner wall. The flexible connector 51 is made of rubber. An annular airbag 5 is fixed on the inner edge wall of each flexible connector 51. The annular airbag 5 is an elastic airbag. The annular airbag 5 and the flexible connector 51 together constitute a flexible holding body.

[0039] The outer wall of the sample tube 2 is provided with an annular groove 21 for the annular airbag 5 to be inserted and held when it is inflated. Inside the cabinet 1, a support plate 6 is installed to support the bottom of each sample tube 2 through a shaking mechanism 8. The cabinet 1 is provided with a drive mechanism 4, and the drive mechanism 4 is linked with the shaking mechanism 8 through a pushing linkage mechanism 9 to drive the support plate 6 to shake up, down and left and right.

[0040] Each sample tube 2 is equipped with a cover 22 at its top, and each cover 22 is equipped with an air inlet pipe 3. Each air inlet pipe 3 is connected to the oxygen supply system. After the sample tube 2 is inserted into the bath heating chamber 11 through the insertion hole 12 and is in place, the cover 22 is placed on top of the sample tube 2 to seal the top port of the sample tube 2. At the same time, the air inlet pipe 3 is connected to the inside of the sample tube 2 to facilitate the delivery of oxygen into the sample tube 2. In addition, the cover 22 is made of opaque material, and the upper part of the sample tube 2 is also made of opaque material. The specific materials of the cover 22 and the sample tube 2 can be conventional materials, which will not be explained in detail in this application. After the cover 22 is tightly closed on the top of the sample tube 2, the cover 22 and the upper part of the sample tube 2 maintain the light-blocking condition, and there is no need to set up an additional light shield.

[0041] like Figure 2 and Figure 8 As shown, adjacent annular airbags 5 are connected by air guide pipes 52. One side of the annular airbag 5 is connected to the inflation / deflation pipe 53, which extends to the outside of the cabinet 1 and is connected to an external inflation / deflation device (using existing technology, not shown in the figure). The six annular airbags 5 are connected in series by the inflation / deflation pipe 53 and the five air guide pipes 52, so that the six annular airbags 5 share the same inflation / deflation path and can be inflated and deflated simultaneously, simplifying the complexity of the pipeline layout.

[0042] like Figure 10 As shown, the sway-assisting mechanism 8 includes a slide rod 81, a guide rod 85, and an arc-shaped slope 86. A slide rail 82 extending to the left and right is fixed on the bottom wall of the bathing chamber 11. A slide seat 83 is slidably installed on the slide rail 82. The slide rail 82 has a T-shaped cross section, and the cross section of the slide seat 83 is adapted to the slide rail 82. When the slide seat 83 is slidably installed on the slide rail 82, it plays a limiting and anti-detachment role, ensuring the overall stability.

[0043] A bracket 84 in the shape of an inverted L is fixed to the top of the slide block 83. A vertical through-hole 841 is opened on the top of the bracket 84. The slide rod 81 is slidably installed in the through-hole 841. The arc-shaped slope 86 is fixed to the bottom wall of the bathing chamber 11 and located on one side of the slide rail 82. The arc-shaped slope 86 extends left and right and is high in the middle and low on both sides to realize the undulating change of the slide rod 81. A roller 811 is installed at the bottom of the slide rod 81 and presses against the top surface of the arc-shaped slope 86. The guide rod 85 is fixed to the bracket 84 and extends left and right. One end of the guide rod 85 is rounded and serves as a pressure end, which presses against the pushing linkage mechanism 9. The other end of the guide rod 85 slides through and extends to the outside of the cabinet 1 and is connected to the outer wall of the cabinet 1 through an elastic reset structure. The support plate 6 is fixedly installed on the top of the slide rod 81.

[0044] like Figure 11 As shown, the elastic reset structure includes a mounting bracket 851, a mounting plate 853, and a spring 854. The mounting bracket 851 is horizontally L-shaped, with one end fixed to the outer wall of the cabinet 1 and the other end having a through hole 852. The guide rod 85 slides through the hole 852. The mounting plate 853 is fixed to the outer wall of the annular airbag 5 located outside the cabinet 1. The spring 854 is sleeved on the outside of the guide rod 85, with one end fixed to the mounting plate 853 and the other end fixed to the mounting bracket 851. When the guide rod 85 is squeezed by the pushing linkage mechanism 9 and moves, the spring 854 is compressed and stores force.

[0045] like Figure 2 and Figure 3 As shown, the drive mechanism 4 includes a drive motor 42 and a main shaft 43. A motor frame 41 is fixed on the cabinet 1. The drive motor 42 is fixed on the motor frame 41. The main shaft 43 is fixed on the output shaft of the drive motor 42 and extends vertically downward into the bathing chamber 11. When the drive motor 42 works, its output shaft can drive the main shaft 43 to rotate, providing effective drive for the corresponding structure.

[0046] like Figure 10 and Figure 12 As shown, the pushing linkage mechanism 9 includes a second rotating shaft 91 and a pushing wheel 92. The bottom end of the main shaft 43 extends through into the bottom cavity 13. The second rotating shaft 91 is vertically rotatably mounted on the bottom wall of the bathing chamber 11, and the bottom end of the second rotating shaft 91 extends through into the bottom cavity 13. The bottom end of the main shaft 43 and the bottom end of the second rotating shaft 91 are connected by a pulley group 93. The pulley group 93 includes two pulleys and a transmission belt. The two pulleys are respectively fixed on the main shaft 43 and the second rotating shaft 91. The pulleys are fitted on the two pulleys, thus realizing the transmission connection between the second rotating shaft 91 and the main shaft 43. The pulleys are synchronous pulleys and the belt is a synchronous belt to avoid slippage and ensure the stability of the transmission.

[0047] The pusher wheel 92 is fixed on the top of the second rotating shaft 91 and is positioned in correspondence with the guide rod 85. The circumferential side wall of the pusher wheel 92 has an arc-shaped protrusion 921, and the arc-shaped protrusion 921 is pressed and engaged with the pressure end of the guide rod 85.

[0048] The working principle of this embodiment is as follows:

[0049] After sealing each sample tube 2 containing the sample with the cap 22, it is inserted into the bathing chamber 11 through the insertion hole 12. When the bottom of the sample tube 2 is supported on the support plate 6, the annular groove 21 corresponds to the position of the annular air bladder 5. Then the inflation and deflation device works to inflate the six annular air bladders 5 at the same time. After inflation, each annular air bladder 5 extends into the corresponding annular groove 21 to achieve the clamping and constraint of the sample tube 2.

[0050] In the actual oxidation measurement process, the drive motor 42 drives the main shaft 43 to rotate. Under the transmission action of the pulley group 93, the main shaft 43 drives the second rotating shaft 91 and the push wheel 92 to rotate continuously. The arc-shaped protrusion 921 swings continuously around the axis of the second rotating shaft 91. When the arc-shaped protrusion 921 swings to contact the pressure end of the guide rod 85, it can continuously push the guide rod 85, the bracket 84, the slide seat 83 and the slide rod 81 to move along the slide rail 82 to the side away from the push wheel 92. At the same time, the spring 854 is compressed and stored. During the movement, the roller 811 rolls against the top surface of the arc-shaped slope 86. Under the squeezing action of the deformation of the top structure of the arc-shaped slope 86, the slide rod 81 moves up and down at the same time, which causes the support plate 6 to shift in both the horizontal and vertical directions.

[0051] The flexible holding body composed of the annular airbag 5 and the flexible connector 51 gives the sample tube 2 a certain degree of mobility. Combined with the supporting role of the support plate 6 on the bottom of the sample tube 2, when the support plate 6 moves, it can simultaneously move each sample tube 2 in the horizontal and vertical directions, effectively simulating the shaking during transportation and ensuring the accuracy of the measurement. In addition, when the pressure end of the guide rod 85 gradually separates from the arc-shaped protrusion 921, under the elastic force of the spring 854, it can push the guide rod 85 to slide and reset to the side of the pusher wheel 92. This process causes the sample tube 2 to shake sequentially again. That is, during the process of the pusher wheel 92 rotating once, the sample tube 2 can undergo two shaking processes, simulating a high shaking frequency, which is more in line with the actual transportation conditions.

[0052] In addition, by releasing air through the inflation / deflation tube 53, the annular airbag 5 contracts and disengages from the annular groove 21, allowing the sample tube 2 to be removed.

[0053] Example 2

[0054] Please see Figure 10 and Figure 11 The difference between this embodiment and Embodiment 1 is that:

[0055] The mounting bracket 851 is provided with a vertical insertion hole 855, and the insertion hole 855 is in communication with the opening 852. A pin 856 is movably inserted into the insertion hole 855. A limiting hole 857 is provided on the outer wall of the guide rod 85. When the pin 856 is aligned and inserted into the limiting hole 857, the pressure-bearing end of the guide rod 85 does not contact the outer peripheral wall of the pusher wheel 92 or the arc-shaped protrusion 921.

[0056] A handle is installed on the end of the guide rod 85 located outside the cabinet 1. By pinching the handle, the guide rod 85 is pulled away from the pusher wheel 92 until the limiting hole 857 is aligned with the pin 856. The pin 856 is inserted into the limiting hole 857, which locks the guide rod 85. At this time, no matter how the pusher wheel 92 rotates, the pusher wheel 92 and the arc-shaped protrusion 921 will not contact the pressure end of the guide rod 85, thus ensuring that the tray 6 will not shift during the rotation of the pusher wheel 92. This mechanism can eliminate the simulation of shaking of the sample tube 2, thus conforming to the working conditions of static storage of oil. It can be seen that this device can simulate both static storage and transportation shaking conditions, and has high versatility.

[0057] At the same time, pulling the pin 856 out of the limiting hole 857 will cancel the limiting lock on the guide rod 85. When the pressure end of the guide rod 85 contacts the apex of the arc-shaped protrusion 921, the limiting hole 857 will not be aligned with the pin 856, thus preventing the pin 856 from automatically falling into the limiting hole 857 due to gravity.

[0058] Example 3

[0059] Please see Figure 4 , Figure 5 , Figure 9 , Figure 10 and Figure 11 The difference between this embodiment and Embodiment 2 is that:

[0060] A stirring mechanism is provided at the bottom of the bathing chamber 11, and the stirring mechanism is linked with the drive mechanism 4 to stir the heat medium in the bathing chamber 11. Specifically, the stirring mechanism includes several first rotating shafts 7 and stirring paddles 71. The first rotating shafts 7 are rotatably installed at intervals on the bottom wall of the bathing chamber 11. The bottom ends of each stirring paddle 71 extend vertically downwards into the bottom cavity 13. The top of each first rotating shaft 7 is equipped with a stirring paddle 71. A gear 72 is fixedly mounted on the outer wall of the main shaft 43 in the bottom cavity 13. A toothed disc 73 is fixedly mounted on the outer wall of each first rotating shaft 7 in the bottom cavity 13. Adjacent toothed discs 73 mesh with each other, and the gear 72 meshes with one of the toothed discs 73.

[0061] When the drive motor 42 drives the main shaft 43 to rotate, the main shaft 43 drives the gear 72 to rotate synchronously. Under the meshing transmission action of the gear 72 and the corresponding gear disk 73, the gear 72 can drive the gear disk 73 and the first rotating shaft 7 at that position to rotate. Under the meshing transmission action of the two adjacent gear disks 73, the gear disks 73 and the first rotating shaft 7 at each position are driven to rotate simultaneously. The rotating first rotating shaft 7 can drive the stirring paddle 71 to play a stirring effect at the bottom of the bathing chamber 11, which can stir the hot medium in the bathing chamber 11 evenly and ensure that the sample in the sample tube 2 is heated evenly.

[0062] like Figure 9 As shown, the tray 6 has several vertically penetrating perforated grooves 61 evenly distributed on it. The perforated grooves 61 facilitate the vertical flow of the heat medium for uniform heating. In addition, the perforated tray 6 can reduce material costs.

[0063] In this application, the stirring drive and the shaking drive of the tray 6 both come from the driving mechanism 4, so that the two share the same driving source, reducing the driving cost. At the same time, the stirring paddle 71 is limited to the bottom of the bath heating chamber 11, so that the hot medium rolls up and down to achieve uniform heating. Moreover, the stirring area of ​​one stirring paddle 71 covers two sample tubes 2. In addition, during the shaking of the sample tube 2, the hot medium in the bath heating chamber 11 is also stirred, which complements the stirring effect of the stirring paddle 71, resulting in good uniform heating effect.

[0064] Example 4

[0065] Please see Figure 7 The difference between this embodiment and embodiment 3 is as follows:

[0066] The support plate 6 is made of metal. Each sample tube 2 has a magnet 201 embedded at the bottom that magnetically engages with the support plate 6. When the bottom of the sample tube 2 is supported on the support plate 6, the magnet 201 magnetically fixes the bottom of the sample tube 2 to the support plate 6 to prevent slippage. On the one hand, this ensures that the sample tube 2 can swing synchronously with the support plate 6 to achieve effective shaking simulation. On the other hand, it prevents the stirring paddle 71 from stirring the medium and causing the sample tube 2 to shake randomly when simulating static placement.

[0067] Furthermore, it is worth noting that this application simulates the shaking of the sample tube 2 by driving the plate 6 to shift through the linkage of the drive mechanism 4, the shaking-assist mechanism 8, and the pushing linkage mechanism 9. Compared with the traditional method of directly stirring inside the sample, the vibration disturbance is more gentle. It will not damage the structure of the antioxidant components in the oil sample due to the shear force of internal stirring, nor will it interfere with the natural process of oxidation reaction due to the additional local heat generated by violent friction, thus improving the accuracy of the measurement results.

[0068] The method for determining the oxidation stability of distillate fuel oil using this apparatus is as follows:

[0069] The heat medium is introduced into the bath heating chamber 11 and the water bath temperature is controlled to reach 95±0.02℃. The sample tubes 2 sealed by the cover body 22 are inserted into the bath heating chamber 11 and locked by the inflation of the annular air bag 5.

[0070] Turn on the oxygen supply line, adjust the oxygen supply flow rate to 50±5mL / min, and introduce oxygen into each sample tube 2. At the same time, take advantage of the material properties of the cover 22 and the upper part of the sample tube 2 to achieve light protection. The test begins and is timed for 16 hours.

[0071] If the transportation process needs to be simulated, the pin 856 is pulled out from the limiting hole 857, and the driving mechanism 4 works to drive the tray 6 and the sample tube 2 to shake, while driving the stirring mechanism to stir. If the static storage process needs to be simulated, the pin 856 is aligned and inserted into the limiting hole 857 to cancel the shaking simulation of the sample tube 2.

[0072] After the test time is reached, the heat medium in the bathing chamber 11 is emptied, and at the same time the cold circulation system works to cool down the sample tube 2 and the internal sample. If the temperature does not reach room temperature, the cold circulation cooling process can be repeated.

[0073] After standing and cooling for no more than 4 hours, remove sample tube 2 and transfer the sample in sample tube 2 to the subsequent determination experiment.

[0074] The subsequent test is to determine the filterable insoluble matter. The specific method for this step is consistent with that in SH / T0175-2004 Determination of Oxidation Stability of Distillate Fuel Oil (Accelerated Method), and will not be repeated here.

[0075] The control method of the present invention is automatic control through a controller. The control circuit of the controller can be implemented by simple programming by those skilled in the art. The power supply is also common knowledge in the art. Therefore, the present invention will not explain the control method and circuit connection in detail.

[0076] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention.

Claims

1. A device for determining the oxidation stability of distillate fuel oil, comprising a cabinet (1) and a plurality of sample tubes (2), wherein a heating chamber (11) is provided inside the cabinet (1), and a plurality of insertion holes (12) communicating with the heating chamber (11) are provided on the cabinet (1), wherein the sample tubes (2) can be inserted into the heating chamber (11) by passing through the insertion holes (12), characterized in that: Each of the bathing chambers (11) has an annular flexible connector (51) fixed on its inner wall, and an annular airbag (5) fixed on the inner edge wall of each of the flexible connectors (51). The outer wall of the sample tube (2) is provided with an annular groove (21) for the annular airbag (5) to be inserted when it is inflated, so as to achieve the holding. The cabinet (1) is equipped with a support plate (6) for supporting the bottom of each sample tube (2) through a swaying mechanism (8). The cabinet (1) is provided with a drive mechanism (4), and the drive mechanism (4) is linked with the swaying mechanism (8) through the push linkage mechanism (9) to drive the tray (6) to sway up, down and left and right. The bottom of the bathing chamber (11) is provided with a stirring mechanism, and the stirring mechanism is linked with the driving mechanism (4) to stir the heat medium in the bathing chamber (11).

2. The apparatus for determining the oxidation stability of distillate fuel oil according to claim 1, characterized in that: The two adjacent annular airbags (5) are connected by air guide tubes (52); One of the annular airbags (5) on one side is connected to the inflation / deflation pipe (53), and the inflation / deflation pipe (53) extends to the outside of the cabinet (1) and is connected to the external inflation / deflation device.

3. The apparatus for determining the oxidation stability of distillate fuel oil according to claim 1, characterized in that: The sway-assisting mechanism (8) includes a slide bar (81), a guide bar (85), and an arc-shaped ramp (86). The bottom wall of the bathing chamber (11) is fixed with a slide rail (82) extending to the left and right. The slide rail (82) is slidably mounted with a slide block (83) at the upper limit. The top of the slide block (83) is fixed with a bracket (84) in the shape of an inverted L. The bracket (84) has a vertical through-hole (841) at the top, and the slide rod (81) is slidably installed in the slide hole (841). The arc-shaped slope (86) is fixed to the bottom wall of the bathing chamber (11) and located on one side of the slide rail (82). The arc-shaped slope (86) extends to the left and right and is high in the middle and low on both sides. The bottom end of the slide bar (81) is equipped with a roller (811) that is pressed against the top surface of the arc-shaped slope (86). The guide rod (85) is fixed to the bracket (84) and extends to the left and right; One end of the guide rod (85) is rounded and serves as a pressure-bearing end, which is squeezed and cooperates with the pushing linkage mechanism (9). The other end of the guide rod (85) slides through and extends to the outside of the cabinet (1), and is connected to the outer wall of the cabinet (1) through an elastic reset structure. The tray (6) is fixedly installed on the top of the slide bar (81).

4. The apparatus for determining the oxidation stability of distillate fuel oil according to claim 3, characterized in that: The elastic reset structure includes a mounting bracket (851), a mounting plate (853), and a spring (854); The mounting bracket (851) is horizontally L-shaped, with one end fixed to the outer wall of the cabinet (1) and the other end having a through hole (852). The guide rod (85) slides through the orifice (852), and the mounting plate (853) is fixed on the outer wall of the annular airbag (5) located outside the cabinet (1); The spring (854) is sleeved on the outside of the guide rod (85), with one end fixed to the mounting plate (853) and the other end fixed to the mounting bracket (851); When the guide rod (85) moves under the pressure of the pushing linkage mechanism (9), the spring (854) is compressed and stores force.

5. The apparatus for determining the oxidation stability of distillate fuel oil according to claim 4, characterized in that: The drive mechanism (4) includes a drive motor (42) and a main shaft (43). A motor frame (41) is fixed on the cabinet (1), and the drive motor (42) is fixed on the motor frame (41); The main shaft (43) is fixed on the output shaft of the drive motor (42) and extends vertically downwards into the bathing chamber (11).

6. The apparatus for determining the oxidation stability of distillate fuel oil according to claim 5, characterized in that: The pushing linkage mechanism (9) includes a second rotating shaft (91) and a pushing wheel (92). The cabinet (1) has a bottom cavity (13) located below the bathing chamber (11), and the bottom end of the main shaft (43) extends through into the bottom cavity (13); The second rotating shaft (91) is vertically rotatably mounted on the bottom wall of the bathing chamber (11), and the bottom end of the second rotating shaft (91) extends through into the bottom cavity (13); The bottom end of the main shaft (43) and the bottom end of the second rotating shaft (91) are connected by a pulley group (93); The pushing wheel (92) is fixed on the top of the second rotating shaft (91) and maintains a positional correspondence with the guide rod (85); The pusher wheel (92) has an arc-shaped protrusion (921) on its circumferential sidewall, and the arc-shaped protrusion (921) is pressed against the pressure end of the guide rod (85).

7. The apparatus for determining the oxidation stability of distillate fuel oil according to claim 6, characterized in that: The mounting bracket (851) is provided with a vertical insertion hole (855), and the insertion hole (855) is in communication with the opening (852); A pin (856) is movably inserted into the insertion hole (855); The guide rod (85) has a limiting hole (857) on its outer wall. When the pin (856) is inserted into the limiting hole (857), the pressure end of the guide rod (85) does not contact the outer peripheral wall of the pusher wheel (92) and the arc-shaped protrusion (921).

8. The apparatus for determining the oxidation stability of distillate fuel oil according to claim 6, characterized in that: The stirring mechanism includes several first rotating shafts (7) and stirring paddles (71). The first rotating shaft (7) is rotatably installed at intervals on the bottom wall of the bathing chamber (11), and the bottom ends of each of the stirring paddles (71) extend vertically downwards into the bottom cavity (13); Each of the first rotating shafts (7) is equipped with a stirring paddle (71) at its top end. The main shaft (43) is fixedly fitted with a gear (72) on the outer wall inside the bottom cavity (13). Each first rotating shaft (7) is fixedly fitted with a gear disc (73) on the outer wall inside the bottom cavity (13). Adjacent gear discs (73) mesh with each other. The gear (72) meshes with one of the gear discs (73).

9. The apparatus for determining the oxidation stability of distillate fuel oil according to claim 1, characterized in that: The tray (6) has several through-hole grooves (61) evenly distributed on it. The tray (6) is made of metal, and each sample tube (2) has a magnet (201) embedded at the bottom that magnetically engages with the tray (6).

10. The apparatus for determining the oxidation stability of distillate fuel oil according to claim 1, characterized in that: Each of the sample tubes (2) is provided with a cover (22) at the top, and the cover (22) is made of an opaque material; The upper part of the sample tube (2) is made of an opaque material.

Images