Standard metal measuring vessel cheating simulation test device

Abstract

The utility model provides a standard metal measuring vessel cheating simulation test device, which relates to the field of standard metal measuring vessel test equipment and comprises an external water tank, a standard tank and a detected tank, the external water tank is connected with a liquid inlet at the top of the standard tank through a first pipeline, and the external water tank is connected with an upper liquid inlet pipe at the top of the detected tank through a second pipeline. A liquid outlet at the bottom of the standard tank is connected with an upper liquid inlet pipe at the top of the detected tank through a third pipeline; a herringbone branch pipe is arranged at the bottom of the detected tank, the herringbone branch pipe is connected with a liquid outlet of the water-gas separator through a fourth pipeline, and a liquid inlet of the water-gas separator is connected with an external water tank through a fifth pipeline. The device is simple in structure, and is easy to realize and popularize in trade handover, college teaching, institution training and technical arbitration analysis work.

Description

Technical Field

[0001] The utility model relates to the field of standard metal measuring instrument testing equipment, in particular to a standard metal measuring instrument cheating simulation testing device. Background Art

[0002] Metal measuring vessels are widely used in the petrochemical industry to measure the volume of liquids and gases. Due to their high accuracy, they are often used as standards or for unbiased measurement, and are therefore referred to as standard metal measuring vessels. Standard metal measuring vessels can be used for on-site verification or calibration of vehicle fuel dispensers, flow meters, and other equipment. They can also serve as fairing tanks at gas stations. In recent years, inspections of gas stations have uncovered instances of metering fraud in fairing tanks at some stations. For example, station personnel may modify the fairing tank's hardware to display a higher-than-actual fuel level, causing a fuel dispenser with a negative deviation to appear normal when tested with the fairing tank. Furthermore, when using standard metal measuring vessels for on-site flow testing or flow meter calibration, some technical or service agencies, for business or profit reasons, may use tampered standard metal measuring vessels, resulting in inaccurate measured or displayed values. For ease of use, standard metal measuring vessels used on-site often undergo modifications, such as the addition of readouts, controls, automatic mechanisms, or housings, making any fraud difficult to detect. Cheating behavior has brought illegal benefits to relevant parties and seriously disrupted the market environment of fair measurement.

[0003] Therefore, how to prevent and detect cheating in the measurement of standard metal measuring instruments, reveal the cheating mechanism, and provide effective guidance for administrative agencies and trade-related parties to prevent cheating has become a difficult problem that needs to be solved urgently by technical personnel in this field. Summary of the Invention

[0004] The utility model aims to provide a standard metal measuring instrument cheating simulation test device to solve the problem that there is a lack of equipment for preventing and discovering cheating of standard metal measuring instruments in the existing market.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0006] The utility model provides a standard metal measuring instrument cheating simulation test device, comprising an external water tank, a standard tank and a tank to be tested, wherein an upper liquid inlet pipe is installed on the top cone of the tank to be tested, the external water tank and the liquid inlet on the top of the standard tank are connected via a first pipeline, the external water tank and the upper liquid inlet pipe on the top of the tank to be tested are connected via a second pipeline, and the liquid outlet at the bottom of the standard tank and the upper liquid inlet pipe on the top of the tank to be tested are connected via a third pipeline; a herringbone-shaped branch pipe is provided at the bottom of the tank to be tested, the herringbone-shaped branch pipe is connected to the liquid outlet of a water-gas separator via a fourth pipeline, and the liquid inlet of the water-gas separator is connected to the external water tank via a fifth pipeline; a first external container is provided below the herringbone-shaped branch pipe, and the first external container is placed above an electronic scale;

[0007] The tops of the standard tank and the inspected tank are both provided with a liquid level reading device and a temperature detection device.

[0008] Preferably, a dark box is further provided inside the inspected tank.

[0009] Preferably, the bottom of the inspected tank is further connected to a concealed pipe, and a second external container is provided below the concealed pipe.

[0010] Preferably, the first pipeline is provided with a first stop valve, a first water pump, a second stop valve, a third stop valve and a first regulating valve in sequence from front to back.

[0011] Preferably, the second pipeline is provided with the first stop valve, the first water pump, the second stop valve, the fourth stop valve, and the second regulating valve in sequence from front to back.

[0012] Preferably, a fifth stop valve is provided on the third pipeline.

[0013] Preferably, the left branch below the herringbone branch pipe is a lower liquid inlet pipe, and the right branch is a liquid outlet pipe. The lower liquid inlet pipe and the liquid outlet pipe are respectively provided with a sixth shut-off valve and a drain valve; the pipeline volume of the lower liquid inlet pipe is smaller than the pipeline volume of the liquid outlet pipe, and the liquid outlet of the fourth pipeline is connected to the lower liquid inlet pipe.

[0014] Preferably, a seventh stop valve and a third regulating valve are sequentially provided on the fourth pipeline from front to back.

[0015] Preferably, the fifth pipeline is provided with an eighth stop valve, a second water pump and a ninth stop valve in sequence from front to back.

[0016] Preferably, the liquid level reading device comprises: a liquid level tube, the liquid level tube being inserted between the upper cone of the inspected tank and the overflow cover, the lower end of the liquid level tube being connected to the tank cavity of the inspected tank, the upper end of the liquid level tube extending into the overflow cover of the inspected tank and being installed with a tenth stop valve;

[0017] A scale is connected to the body of the liquid level tube through screws, and a reading vernier is slidably connected to the scale.

[0018] Compared with the prior art, the beneficial technical effects of the present invention are:

[0019] The utility model provides a standard metal measuring instrument cheating simulation test device, comprising an external water tank, a standard tank and a tested tank, wherein an upper liquid inlet pipe is installed on the top cone of the tested tank, the external water tank and the liquid inlet at the top of the standard tank are connected by a first pipeline, the external water tank and the upper liquid inlet pipe at the top of the tested tank are connected by a second pipeline, and the liquid outlet at the bottom of the standard tank and the upper liquid inlet pipe at the top of the tested tank are connected by a third pipeline; a herringbone-shaped branch pipe is provided at the bottom of the tested tank, the herringbone-shaped branch pipe is connected to the liquid outlet of a water-gas separator through a fourth pipeline, and the liquid inlet of the water-gas separator is connected to the external water tank through a fifth pipeline; a first external container is provided below the herringbone-shaped branch pipe, and the first external container is placed above an electronic scale; a liquid level reading device and a temperature detection device are both provided on the tops of the standard tank and the tested tank. The utility model has a simple structure and is easy to implement and promote in trade handover, university teaching, institutional training, and technical arbitration analysis. In addition, the utility model simulates the cheating process through the inspected tank to reveal the cheating mechanism, providing effective guidance for administrative authorities and trade-related parties to prevent and discover cheating behaviors. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention will be further described below with reference to the accompanying drawings.

[0021] Figure 1 This is a schematic diagram of the principle of the standard metal measuring instrument cheating simulation test device of the utility model;

[0022] Figure 2 for Figure 1 A schematic diagram of the structure at center A;

[0023] Figure 3 This is a schematic diagram of the herringbone branch pipe of the utility model.

[0024] Explanation of Reference Numerals: 1. External water tank; 2. Standard tank; 3. Tested tank; 4. First pipeline; 5. Second pipeline; 6. Third pipeline; 7. Fourth pipeline; 8. Water-gas separator; 9. Fifth pipeline; 10. First external container; 11. Second external container; 12. Liquid level tube; 13. Scale; 14. Butterfly valve;

[0025] 101. Electronic scale; 31. Herringbone branch pipe; 32. Dark box; 33. Dark pipe; 34. Upper liquid inlet pipe; 35. Measuring neck; 36. Overflow cover;

[0026] 41. First stop valve; 42. First water pump; 43. Second stop valve; 44. Third stop valve; 45. First regulating valve;

[0027] 51. Fourth stop valve; 52. Second regulating valve;

[0028] 61. Fifth stop valve;

[0029] 311, lower liquid inlet pipe; 312, liquid outlet pipe; 313, sixth stop valve; 314, drain valve;

[0030] 71. Seventh stop valve; 72. Third regulating valve;

[0031] 91. Eighth stop valve; 92. Second water pump; 93. Ninth stop valve;

[0032] 121. Tenth stop valve; 131. Screw; 132. Reading cursor. DETAILED DESCRIPTION

[0033] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0034] like Figure 1-3 As shown, a standard metal measuring instrument cheating simulation test device includes an external water tank 1, a standard tank 2 and a tested tank 3, an upper liquid inlet pipe 34 is installed on the top cone of the tested tank 3, the external water tank 1 and the liquid inlet at the top of the standard tank 2 are connected by a first pipeline 4, the external water tank 1 and the upper liquid inlet pipe 34 at the top of the tested tank 3 are connected by a second pipeline 5, and the liquid outlet at the bottom of the standard tank 2 and the upper liquid inlet pipe 34 at the top of the tested tank 3 are connected by a third pipeline 6; a herringbone-shaped branch pipe 31 is provided at the bottom of the tested tank 3, the herringbone-shaped branch pipe 31 is connected to the liquid outlet of a water-gas separator 8 through a fourth pipeline 7, and the liquid inlet of the water-gas separator 8 is connected to the external water tank 1 through a fifth pipeline 9; a first external container 10 is provided below the herringbone-shaped branch pipe 31, and the first external container 10 is placed above an electronic scale 101;

[0035] The tops of the standard tank 2 and the inspected tank 3 are both provided with a liquid level reading device and a temperature detection device.

[0036] The lower end of the upper liquid inlet pipe 34 is vertically arranged in the tank cavity of the inspected tank 3 .

[0037] Specifically, a dark box 32 is further provided inside the inspected tank 3 .

[0038] Among them, a cylindrical measuring neck 35 is set at the top center of the inspected tank 3. In specific implementation, the measuring neck 35 is made of transparent glass, and the liquid in the external water tank 1 is opaque, so as to facilitate the teaching of cheating test with standard metal measuring instruments.

[0039] Among them, the standard tank 2 uses a second-class standard metal measuring instrument, and the inspected tank 3 uses a third-class standard metal measuring instrument.

[0040] Specifically, the bottom of the inspected tank 3 is further connected to a concealed pipe 33 , and a second external container 11 is provided below the concealed pipe 33 .

[0041] Specifically, the first pipeline 4 is provided with a first stop valve 41 , a first water pump 42 , a second stop valve 43 , a third stop valve 44 and a first regulating valve 45 in sequence from front to back.

[0042] Specifically, the second pipeline 5 is provided with the first stop valve 41 , the first water pump 42 , the second stop valve 43 , the fourth stop valve 51 , and the second regulating valve 52 in sequence from front to back.

[0043] Specifically, a fifth stop valve 61 is provided on the third pipeline 6 .

[0044] Specifically, the left branch below the herringbone branch pipe 31 is a lower liquid inlet pipe 311, and the right branch is a liquid outlet pipe 312. The lower liquid inlet pipe 311 and the liquid outlet pipe 312 are respectively provided with a sixth shut-off valve 313 and a drain valve 314; the pipe volume of the lower liquid inlet pipe 311 is smaller than the pipe volume of the liquid outlet pipe 312, and the liquid outlet of the fourth pipeline 7 is connected to the lower liquid inlet pipe 311.

[0045] Specifically, the fourth pipeline 7 is provided with a seventh stop valve 71 and a third regulating valve 72 in sequence from front to back.

[0046] Specifically, the fifth pipeline 9 is provided with an eighth stop valve 91 , a second water pump 92 and a ninth stop valve 93 in sequence from front to back.

[0047] Specifically, the liquid level reading device includes: a liquid level tube 12, which is inserted between the upper cone of the inspected tank 3 and the overflow cover 36, the lower end of the liquid level tube 12 is connected to the tank cavity of the inspected tank 3, and the upper end of the liquid level tube 12 extends into the overflow cover 36 of the inspected tank 3 and is installed with a tenth stop valve 121;

[0048] The scale 13 is connected to the body of the liquid level tube 12 via a screw 131 , and a reading cursor 132 is slidably connected to the scale 13 .

[0049] Each stop valve, each regulating valve and each water pump in the utility model are initially in a closed state.

[0050] The use process of this utility model is as follows:

[0051] Calibrate the nominal capacity scale of the inspected tank 3:

[0052] Before using the inspected tank 3 to simulate various cheating behaviors, it is necessary to calibrate the nominal capacity scale of the inspected tank 3. The specific calibration method is as follows:

[0053] Step 1: Open the first stop valve 41, the second stop valve 43, the third stop valve 44 and the first water pump 42, and at the same time control the instantaneous flow of the liquid flowing through the first pipeline 4 through the first regulating valve 45 to discharge the liquid in the external water tank 1 into the standard tank 2. After the standard tank 2 is filled with liquid, close the first stop valve 41, the second stop valve 43, the third stop valve 44 and the first water pump 42; wait for a while, and after the wall of the standard tank 2 is fully moistened, open the fifth stop valve 61, and discharge all the liquid in the standard tank 2 into the inspected tank 3 through the third pipeline 6. To ensure that all the liquid in the standard tank 2 is discharged into the inspected tank 3, wait for 2 minutes when the liquid in the third pipeline 6 is in a dripping state;

[0054] Step 2: Close the fifth stop valve 61, open the drain valve 314, and completely drain the liquid in the inspected tank 3 into the first external container 10. Wait for 2 minutes in a dripping state, and then close the drain valve 314.

[0055] Step 3: Pour the liquid in the external water tank 1 into the standard tank 2, adjust the liquid level to the nominal capacity scale line position and measure the medium temperature in the standard tank 2 through the temperature detection device;

[0056] Step 4: Open the fifth stop valve 61 and completely drain the liquid in the standard tank 2 into the inspected tank 3. Wait for 2 minutes in a trickle state, then close the fifth stop valve 61, record the liquid level in the inspected tank 3 at this time, and measure the temperature of the medium in the inspected tank 3 using a temperature detection device.

[0057] Step 5: Open the drain valve 314 to completely drain the liquid in the inspected tank 3 into the first external container 10, wait for 2 minutes in the dripping state, and then close the drain valve 314;

[0058] Repeat steps 1 to 5 to complete at least 3 calibration operations, and obtain the nominal capacity scale of the inspected tank 3 based on the multiple measurement results.

[0059] Demonstration of cheating operation by occupying working medium:

[0060] The dark box 32 can simulate the addition of a cheating container or the dropping of a foreign object into the inspected can 3. The volume of the dark box 32 is set to z1, and its upper cover can be opened and closed. When open, the inner cavity of the dark box 32 is connected to the tank cavity of the inspected can 3. When closed, the inner cavity of the dark box 32 and the tank cavity of the inspected can 3 are isolated.

[0061] During the metering operation, liquid from the external water tank 1 is metered into the inspected tank 3 via the first water pump 42 from the top of the inspected tank 3 or via the second water pump 92 from the lower liquid inlet pipe 311 until the liquid level reaches the measuring neck range of the inspected tank 3. If the cover of the dark box 32 is not opened during the metering process, it will be empty when the metering operation is completed, occupying a portion of the effective volume of the inspected tank 3. This means that the measured volume displayed on the measuring instrument of the inspected tank 3 is z1 more than the actual measured volume, that is, the cheating amount is z1. If the cover of the dark box 32 is opened during the metering process, it will be full of medium when the metering operation is completed, and no effective volume will be occupied.

[0062] During the measuring operation, the liquid in the external water tank 1 is filled into the inspected tank 3 from the top of the inspected tank 3 via the first water pump 42 or from the lower liquid inlet pipe 311 via the second water pump 92. The liquid level is adjusted to the nominal capacity scale line position of the inspected tank 3, and then the drain valve 314 is opened to completely measure the liquid from the inspected tank 3 into the first external container 10. If the cover of the dark box 32 is not opened during the filling process, the dark box 32 will be empty when the filling is completed, occupying a part of the effective volume of the inspected tank 3. If the cover of the dark box 32 remains closed during the measuring process, when the measuring operation is completed, the measured volume displayed by the measuring instrument of the inspected tank 3 will be z1 more than the actual volume;

[0063] Demonstration of cheating operation by intercepting working medium:

[0064] During the measuring operation, liquid from the external water tank 1 is filled into the inspected tank 3 from the top of the inspected tank 3 via the first water pump 42 or from the lower liquid inlet pipe 311 via the second water pump 92. The liquid level is adjusted to the nominal capacity scale line of the inspected tank 3, and then the drain valve 314 is opened to completely measure the liquid from the inspected tank 3 into the first external container 10. If the cover of the dark box 32 is opened during the filling process, regardless of whether the cover remains open or closed during the measuring process, liquid in the dark box 32 will be retained upon completion of the measuring operation, resulting in the measured volume displayed by the measuring instrument exceeding the actual value by an amount z1. If the cover of the dark box 32 is not opened during the filling process, but remains open during the measuring process, liquid in the dark box 32 will be retained upon completion of the measuring operation, resulting in the measured volume displayed by the measuring instrument exceeding the actual value by an amount z1.

[0065] Demonstration of cheating operation by secretly discharging working medium:

[0066] A concealed pipe 33 is installed at the outer wall of the lower cone at the bottom of the inspected tank 3, and a concealed pipe valve is provided on the concealed pipe 33.

[0067] During the metering operation, liquid from the external water tank 1 is metered into the inspected tank 3 from the top of the inspected tank 3 by the first water pump 42 or from the lower liquid inlet pipe 311 by the second water pump 92 until the liquid level reaches the measuring neck of the inspected tank 3. During the metering process, the concealed pipe valve is opened, and a portion of the liquid (assuming its volume is z2) is discharged from the concealed pipe 33 into the second external container 11. When the metering operation is completed, the measured volume displayed on the measuring instrument of the inspected tank 3 is less than the actual volume by a deduction of z2.

[0068] During the measuring operation, liquid from the external water tank 1 is filled into the inspected tank 3 from the top via the first water pump 42 or from the lower liquid inlet pipe 311 via the second water pump 92. The liquid level is adjusted to the nominal capacity scale line of the inspected tank 3. The drain valve 314 is then opened to completely measure the liquid from the inspected tank 3 into the first external container 10. During the measuring process, if the concealed pipe valve is opened, a portion of the liquid (assuming its volume is z2) is discharged from the concealed pipe 33 into the second external container 11. When the measuring operation is completed, the measured volume displayed on the measuring instrument of the inspected tank 3 is a deceptive amount z2 greater than the actual volume.

[0069] Demonstration of cheating operation by changing the nominal capacity scale line:

[0070] After the inspected tank 3 is calibrated, the relative position between the scale 13 and the liquid level tube 12 is changed by adjusting the screw 131, which is equivalent to the nominal capacity scale line of the inspected tank 3 being changed. The changed volume is assumed to be z3.

[0071] During the metering operation, liquid from the external water tank 1 is metered into the inspected tank 3 via the first water pump 42 from the top of the inspected tank 3 or via the second water pump 92 from the lower liquid inlet pipe 311 until the liquid level reaches the measuring neck of the inspected tank 3. If the scale 13 moves upward before the metering operation, the measured volume displayed on the inspected tank 3's scale will be less than the actual volume by a cheating amount of z3. If the scale moves downward before the metering operation, the measured volume displayed on the inspected tank 3's scale will be more than the actual volume by a cheating amount of z3.

[0072] During the measuring operation, liquid from the external water tank 1 is filled into the inspected tank 3 from the top of the inspected tank 3 via the first water pump 42 or from the lower liquid inlet pipe 311 via the second water pump 92. The liquid level is adjusted to the nominal capacity scale line of the inspected tank 3. The drain valve 314 is then opened to completely measure the liquid from the inspected tank 3 into the first external container 10. If the scale moves upward before filling, the measured volume displayed on the inspected tank 3's scale will be less than the actual volume by a deceptive amount z3. If the scale moves downward before filling, the measured volume displayed on the inspected tank 3's scale will be more than the actual volume by a deceptive amount z3.

[0073] Demonstration of cheating operation using the tenth stop valve 121:

[0074] The tenth stop valve 121 is used to isolate the lumen of the liquid level tube 12 from the atmosphere. During normal operation, the tenth stop valve 121 should be in an open state, and the liquid level in the metering neck 35 should be level with the liquid level in the liquid level tube 12 .

[0075] During the measuring operation, the liquid in the external water tank 1 is measured into the inspected tank 3 from the top of the inspected tank 3 through the first water pump 42 or from the lower liquid inlet pipe 311 through the second water pump 92. When the liquid level approaches the nominal capacity scale line of the inspected tank 3, the tenth stop valve 121 is closed. At this time, the liquid level in the metering neck 35 is still rising, but the liquid level in the liquid level tube 12 no longer rises due to the gas pressure. When the measuring operation is completed, the liquid level in the liquid level tube 12 will inevitably be artificially low. Assuming that the volume of the artificial low is z4, it is equivalent to the measured volume displayed by the measuring instrument being z4 less than the actual volume.

[0076] During the measuring operation, liquid from the external water tank 1 is filled into the inspected tank 3 via the first water pump 42 from the top of the inspected tank 3 or via the second water pump 92 from the lower liquid inlet pipe 311. When the liquid level in the liquid level tube 12 reaches the nominal capacity scale line of the inspected tank 3, the tenth stop valve 121 is closed. At this point, the liquid level in the liquid level tube 12 stops rising due to gas pressure, while the liquid level in the metering neck 35 continues to rise for a period of time, completing the filling operation. The drain valve 314 and the tenth stop valve 121 are then opened to completely measure the liquid from the inspected tank 3 into the first external container 10. When the measuring operation is completed, the measured volume displayed on the measuring instrument is less than the actual volume by a factor of z4.

[0077] Demonstration of cheating operation using butterfly valve 14:

[0078] like Figure 2 As shown, a butterfly valve 14 is installed at the bottom of the metering neck 35 of the tank 3 under inspection. This valve is used to isolate the interior of the metering neck 35 from the tank cavity of the tank 3 under inspection. The switch of the butterfly valve 14 is located outside the metering neck and can be controlled by the butterfly valve switch. During normal operation, the butterfly valve 14 should be open, and the liquid level in the metering neck 35 should be equal to the liquid level in the level tube 12.

[0079] During the measuring operation, the liquid in the external water tank 1 is measured into the inspected tank 3 from the top of the inspected tank 3 through the first water pump 42 or from the lower liquid inlet pipe 311 through the second water pump 92. When the liquid level approaches the nominal capacity scale line of the inspected tank 3, the butterfly valve 14 is closed. At this time, the liquid level in the metering neck 35 of the inspected tank 3 no longer rises, but the liquid level in the liquid level tube 12 is still rising. When the measuring operation is completed, the liquid level in the liquid level tube 12 will inevitably be artificially high. Assuming the volume of the artificial height is z5, it is equivalent to the measured volume displayed by the measuring instrument being z5 more than the actual amount.

[0080] During the measuring operation, liquid from the external water tank 1 is filled into the inspected tank 3 via the first water pump 42 from the top of the inspected tank 3 or via the second water pump 92 from the lower liquid inlet pipe 311. When the liquid level in the liquid level tube 12 approaches the nominal capacity mark on the inspected tank 3, the butterfly valve 14 is closed. At this point, the liquid level in the liquid level tube continues to rise until it reaches the nominal capacity mark, completing the filling operation. The drain 314 and butterfly valve 14 are then opened to completely measure the liquid from the inspected tank 3 into the first external container 10. Upon completion of the measuring operation, the volume of the inspected tank 3 measured by the measuring device exceeds the actual volume by a factor of z5.

[0081] Demonstration of cheating operation to change the preset state of lower liquid inlet pipe 311:

[0082] Let V1 be the volume of the inlet pipe 311 from the sixth shutoff valve 313 to the herringbone branch point, and V2 be the volume of the outlet pipe 312 from the drain valve 314 to the herringbone branch point. During normal operation, V1 is preset to not occupy the effective volume of the inspected tank 3, that is, V1 always contains liquid during both inlet and outlet operations.

[0083] During the metering operation, sixth shut-off valve 313 is opened to drain the liquid from liquid inlet pipe 311, and then sixth shut-off valve 313 is closed. At this point, pipe volume V1 is emptied. Liquid from external water tank 1 is metered into tank 3 via first water pump 42 from the top of tank 3 or second water pump 92 from lower liquid inlet pipe 311 until the liquid level reaches the measuring neck of tank 3. When the metering operation is complete, the displayed volume on the scale is less than the actual volume by an amount V1.

[0084] During the measuring operation, liquid from the external water tank 1 is filled into the inspected tank 3 from the top of the inspected tank 3 via the first water pump 42 or from the lower liquid inlet pipe 311 via the second water pump 92. The liquid level is adjusted to the nominal capacity scale line of the inspected tank 3, and then the drain valve 314 is opened to completely measure the liquid from the inspected tank 3 into the first external container 10. If the pipeline volume V1 has been emptied before the liquid filling process, the liquid in the pipeline volume V1 is retained when the measuring operation is completed, which means that the measured volume is not affected. If the drain valve 314 is opened at the same time as the sixth stop valve 313 during the measuring process, the pipeline volume V1 is emptied, and the measured volume displayed by the measuring instrument upon completion of the measuring operation is equivalent to being less than the actual measured volume by an amount V1.

[0085] Demonstration of cheating operation for interchangeability between lower liquid inlet pipe 311 and liquid outlet pipe 312:

[0086] Liquid is taken in by the liquid outlet pipe 312 and liquid is discharged by the lower liquid inlet pipe 311. Since the pipe volumes V1 and V2 of the two are different, a cheating effect is produced.

[0087] During the metering operation, liquid in the external water tank 1 is metered into the inspected tank 3 from the top of the inspected tank 3 via the first water pump 42 or from the liquid outlet pipe 312 via the second water pump 92 (the sixth shut-off valve 313 remains closed) until the liquid level reaches the metering neck range of the inspected tank 3. Since the normal volume of the inspected tank 3 includes the pipeline volume V2 of the liquid outlet pipe 312 and does not include the pipeline volume V1 of the lower liquid inlet pipe 311, the actual volume of the inspected tank 3 after the exchange includes the pipeline volume V1 of the lower liquid inlet pipe 311 and does not include the pipeline volume V2 of the liquid outlet pipe 312. Since V1 is less than V2, assuming V2-V1=z7, this means that the actual utilized volume of the inspected tank 3 is z7 less than the normal volume. In other words, the measured volume displayed on the measuring instrument after the metering operation is completed is a cheating amount of z7 more than the actual volume.

[0088] During the measuring operation, the liquid in the external water tank 1 is filled into the inspected tank 3 from the top of the inspected tank 3 through the first water pump 42 or from the liquid outlet pipe 312 through the second water pump 92, and the liquid level is adjusted to reach the nominal capacity scale line position of the inspected tank 3, and then the sixth stop valve 313 is opened to completely measure the water from the inspected tank 3 to the first external container 10, which is equivalent to the actual measured volume of the inspected tank 3 being z7 less than the normal volume, that is, when the measuring operation is completed, the measured volume displayed by the measuring instrument is z7 more than the actual volume.

[0089] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0090] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Without departing from the spirit of the present invention, various modifications and improvements to the technical solutions of the present invention made by ordinary technicians in this field should fall within the scope of protection determined by the claims of the present invention.

Claims

1. A standard metal measuring instrument cheating simulation test device, characterized by: The invention comprises an external water tank (1), a standard tank (2) and a tank to be inspected (3); an upper liquid inlet pipe (34) is installed on the top cone of the tank to be inspected (3); the external water tank (1) and the liquid inlet on the top of the standard tank (2) are connected via a first pipe (4); the external water tank (1) and the upper liquid inlet pipe (34) on the top of the tank to be inspected (3) are connected via a second pipe (5); the liquid outlet at the bottom of the standard tank (2) and the upper liquid inlet pipe (34) on the top of the tank to be inspected (3) are connected via a second pipe (5); The tank (3) is connected to the outside water tank (1) through a third pipeline (6); a herringbone-shaped branch pipe (31) is provided at the bottom of the inspected tank (3); the herringbone-shaped branch pipe (31) is connected to the liquid outlet of the water-gas separator (8) through a fourth pipeline (7); the liquid inlet of the water-gas separator (8) is connected to the external water tank (1) through a fifth pipeline (9); a first external container (10) is provided below the herringbone-shaped branch pipe (31), and the first external container (10) is placed above the electronic scale (101); The tops of the standard tank (2) and the inspected tank (3) are both provided with a liquid level reading device and a temperature detection device.

2. The standard metal measuring instrument cheating simulation test device according to claim 1, characterized in that: A dark box (32) is also provided inside the inspected tank (3).

3. The standard metal measuring instrument cheating simulation test device according to claim 1, characterized in that: The bottom of the inspected tank (3) is also connected to a concealed pipe (33), and a second external container (11) is provided below the concealed pipe (33).

4. The standard metal measuring instrument cheating simulation test device according to claim 1, characterized in that: The first pipeline (4) is provided with a first stop valve (41), a first water pump (42), a second stop valve (43), a third stop valve (44) and a first regulating valve (45) in sequence from front to back.

5. The standard metal measuring instrument cheating simulation test device according to claim 4, characterized in that: The second pipeline (5) is provided with the first stop valve (41), the first water pump (42), the second stop valve (43), the fourth stop valve (51), and the second regulating valve (52) in sequence from front to back.

6. The standard metal measuring instrument cheating simulation test device according to claim 1, characterized in that: The third pipeline (6) is provided with a fifth stop valve (61).

7. The standard metal measuring instrument cheating simulation test device according to claim 1, characterized in that: The left branch below the herringbone branch pipe (31) is a lower liquid inlet pipe (311), and the right branch is a liquid outlet pipe (312). The lower liquid inlet pipe (311) and the liquid outlet pipe (312) are respectively provided with a sixth stop valve (313) and a drain valve (314); the pipe volume of the lower liquid inlet pipe (311) is smaller than the pipe volume of the liquid outlet pipe (312), and the liquid outlet of the fourth pipeline (7) is connected to the lower liquid inlet pipe (311).

8. The standard metal measuring instrument cheating simulation test device according to claim 1, characterized in that: The fourth pipeline (7) is provided with a seventh stop valve (71) and a third regulating valve (72) in sequence from front to back.

9. The standard metal measuring instrument cheating simulation test device according to claim 1, characterized in that: The fifth pipeline (9) is provided with an eighth stop valve (91), a second water pump (92) and a ninth stop valve (93) in sequence from front to back.

10. The standard metal measuring instrument cheating simulation test device according to claim 1, characterized in that: The liquid level reading device comprises: a liquid level tube (12), the liquid level tube (12) being inserted between the upper cone of the inspected tank (3) and the overflow cover (36), the lower end of the liquid level tube (12) being connected to the tank cavity of the inspected tank (3), the upper end of the liquid level tube (12) extending into the overflow cover (36) of the inspected tank (3) and being provided with a tenth stop valve (121); A scale (13) is connected to the body of the liquid level tube (12) via a screw (131), and a reading cursor (132) is slidably connected to the scale (13).

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