Fuel dispenser high and low temperature test device

Abstract

The utility model relates to a kind of fuel dispensers high-low temperature test device, comprising: high-low temperature test box, it is airtight heat preservation structure;Sample mounting mechanism, set in high-low temperature test box, for installing and positioning fuel dispenser;Temperature regulating system, for adjusting and maintaining the temperature in high-low temperature test box;Fuel circulation system, including oil pool, oil pipeline and oil return pipeline, the inlet end of fuel dispenser is communicated with oil pool by oil pipeline;Standard metal measuring vessel, its liquid inlet is inserted into the refueling gun of fuel dispenser, its liquid outlet is communicated with oil pool by oil return pipeline;Sensing system, including pressure sensor and first temperature sensor being arranged on oil pipeline, second temperature sensor being arranged in high-low temperature test box and liquid level sensor and third temperature sensor being arranged on standard metal measuring vessel.The utility model realizes the detection of the measurement performance of fuel dispenser under-40 ℃~80 ℃ extreme temperature.

Description

Technical Field

[0001] This utility model relates to the field of fuel dispenser testing technology, and in particular to a high and low temperature testing device for fuel dispensers. Background Technology

[0002] As the core metering equipment in gas stations, fuel dispensers' operational stability and accuracy directly impact consumer rights and the station's operational safety. However, fuel dispensers face diverse geographical and climatic conditions in actual use, ranging from frigid winters (below -30°C) in the north to scorching summers (above 60°C) in the south. These extreme temperature environments can cause problems such as jamming or wear of internal mechanical components, performance drift of electronic components, aging and failure of sealing materials, and poor fuel delivery. Ultimately, this can lead to metering performance exceeding the maximum permissible error, resulting in metering disputes and safety risks. Therefore, before leaving the factory, fuel dispensers must undergo rigorous high and low temperature environmental tests to verify their metering performance, functional reliability, and environmental adaptability under extreme temperature conditions.

[0003] The existing high and low temperature testing equipment for fuel dispensers has the following defects:

[0004] 1) Insufficient precision and uniformity of temperature control. Many test chambers contain significant temperature gradients, with local temperature differences potentially exceeding 5°C. This non-uniformity makes it impossible to accurately simulate real extreme environments, resulting in test results that do not truly reflect the performance of fuel dispensers at specific temperatures;

[0005] 2) Secondly, the convenience and safety of testing procedures for large and heavy equipment like fuel dispensers present challenges. The sheer size of the dispenser makes moving and precisely positioning it within the test chamber extremely difficult. Furthermore, during testing, if operation of the dispenser inside the chamber (e.g., operating the fuel nozzle or making minor adjustments) is required while maintaining a low or high temperature environment, the traditional approach necessitates opening the chamber door. This severely disrupts the stable temperature field inside the chamber, affecting the consistency and accuracy of the test.

[0006] 3) The level of automation and intelligence in data recording is low. Some testing devices still rely on manual observation and recording of data such as temperature and fuel dispenser readings. This method is inefficient, prone to human error, and makes it difficult to achieve full traceability of the testing process and efficient data analysis, failing to meet the requirements of modern metrology and testing for data integrity and analytical depth. Utility Model Content

[0007] The purpose of this utility model is to provide a high and low temperature testing device for fuel dispensers, so as to at least solve one of the technical problems existing in the high and low temperature testing devices for fuel dispensers.

[0008] To achieve the above objectives, this utility model provides a high and low temperature testing device for fuel dispensers, comprising:

[0009] The high and low temperature test chamber has a sealed and insulated structure.

[0010] The sample mounting mechanism, located inside the high and low temperature test chamber, is used to install and position the fuel dispenser;

[0011] A temperature control system is used to regulate and maintain the temperature inside the high and low temperature test chamber;

[0012] The fuel circulation system includes an oil sump, an oil delivery pipeline, and a return oil pipeline. The inlet end of the fuel dispenser is connected to the oil sump through the oil delivery pipeline.

[0013] A standard metal measuring vessel, the inlet of which is inserted into the fuel dispenser nozzle, and the outlet of which is connected to the oil sump through the return oil pipe;

[0014] The sensing system includes a pressure sensor and a first temperature sensor installed on the oil pipeline, a second temperature sensor installed in the high and low temperature test chamber, and a level sensor and a third temperature sensor installed on the standard metal measuring vessel, to obtain the fuel pressure and fuel temperature in the oil pipeline, the temperature in the high and low temperature test chamber, and the fuel temperature and liquid level in the standard metal measuring vessel.

[0015] Optionally, the chamber wall of the high and low temperature test chamber includes an outer steel plate, an insulation layer and an inner liner from the outside to the inside, and the front of the high and low temperature test chamber is provided with a sealed observation window and a door, and the left and right side walls are provided with isolation operation ports and round holes for pipelines.

[0016] Optionally, the isolation port is equipped with nitrile rubber gloves and sealed by a stainless steel compression flange.

[0017] Optionally, a detachable rubber pad is provided at the circular hole.

[0018] Optionally, the sample mounting mechanism includes an adjustable bracket and an elastic fixing clamp. The bottom of the adjustable bracket is installed inside the high and low temperature test chamber via a shock-absorbing pad. The elastic fixing clamp is disposed on the adjustable bracket and is used to clamp and fix the fuel dispenser to the adjustable bracket.

[0019] The adjustable bracket adopts a screw slide structure and can drive the fuel dispenser to move horizontally within the high and low temperature test chamber.

[0020] Optionally, the temperature control system includes:

[0021] Cascade refrigeration units are used to provide a low-temperature environment;

[0022] The electric heating unit includes electric heating tubes evenly distributed around the high and low temperature test chamber;

[0023] The airflow circulation unit consists of a centrifugal fan and a baffle plate. The centrifugal fan drives the air inside the box to flow through the electric heating unit or the cascade refrigeration unit, and then distributes it evenly in the box space through the baffle plate.

[0024] Optionally, there are multiple second temperature sensors distributed around the inner wall of the high and low temperature test chamber.

[0025] Optionally, the standard metal measuring instrument is made of stainless steel, and the outer wall of the standard metal measuring instrument is covered with a first heat insulation layer.

[0026] Optionally, the oil pipeline is made of stainless steel, and the outer wall of the oil pipeline is covered with a second insulation layer.

[0027] Optionally, the high and low temperature testing device for the fuel dispenser further includes an intelligent control system, which includes:

[0028] The PLC controller is communicatively connected to the temperature control system and each sensor in the sensing system.

[0029] The touch screen is communicatively connected to the PLC controller and is used for parameter setting and display.

[0030] The data storage and analysis module, communicating with the PLC controller, is used to record test data and calculate the indication error of the fuel dispenser; and

[0031] The remote communication module is used to support remote monitoring and anomaly alarms on mobile terminals.

[0032] The high and low temperature testing device for fuel dispensers provided by this utility model has at least one of the following beneficial effects:

[0033] 1) The high and low temperature test chamber provides a sealed, insulated space. The sample mounting mechanism allows for the movement and fixation of the fuel dispenser within the chamber. The temperature control system employs a combination of cascade refrigeration and electric heating, coupled with airflow circulation, to achieve precise temperature control from -40℃ to 80℃. The fuel circulation system provides fuel medium circulation for the fuel dispenser, enabling dynamic testing. A standard metal measuring instrument is used to measure the refueling volume. This configuration allows for the testing of the fuel dispenser's metering performance under extreme temperatures ranging from -40℃ to 80℃, significantly improving testing accuracy and reliability.

[0034] 2) The intelligent control system used in this utility model realizes parameter setting, process monitoring and automatic data processing. It calculates the indication error through existing algorithms, avoiding the problems of misreading and miscalculation that may occur in traditional manual recording, and comprehensively improving the accuracy and reliability of test results.

[0035] 3) The design of the isolated operating port and adjustable bracket solves the problem of inconvenient operation of fuel dispensers in high or low temperature environments. Test personnel can operate and adjust the fuel dispensers inside the chamber through the special glove hole without opening the chamber door, which significantly reduces heat loss and temperature fluctuations caused by frequent door opening, ensuring the continuity and safety of the test. At the same time, the adjustable bracket also facilitates the installation and positioning of the fuel dispensers. Attached Figure Description

[0036] Those skilled in the art will understand that the accompanying drawings are provided to better understand the present invention and do not constitute any limitation on the scope of the present invention. Wherein:

[0037] Figure 1 A structural block diagram of a high and low temperature test device for a fuel dispenser provided in an embodiment of this utility model;

[0038] Figure 2 A diagram showing the arrangement of the second temperature sensor according to an embodiment of the present invention;

[0039] Figure 3 A schematic diagram showing the arrangement of the isolation operation port and the circular hole according to an embodiment of this utility model;

[0040] Figure 4 A schematic diagram of the structure of a standard metal measuring instrument provided in an embodiment of this utility model.

[0041] The attached figures are labeled as follows:

[0042] 1-High and low temperature test chamber; 2-Sample mounting mechanism; 3-Oil pool; 4-Oil delivery pipeline; 5-Standard metal measuring instrument; 6-Oil return pipeline; 7-Second temperature sensor; 8-Third temperature sensor; 9-Isolation operation port; 10-Round hole; 11-Fuel dispenser. Detailed Implementation

[0043] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of this utility model. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0044] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0045] In the description of this utility model, it should be understood that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use, or the orientation or positional relationship commonly understood by those skilled in the art. They are only used to facilitate the description of this utility model and to simplify the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0046] Furthermore, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such an article or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the article or apparatus that includes that element. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0047] Please refer to Figures 1-4 This utility model provides a high and low temperature testing device for a fuel dispenser, comprising:

[0048] High and low temperature test chamber 1, which has a sealed and insulated structure;

[0049] The sample mounting mechanism 2 is set inside the high and low temperature test chamber 1 and is used to install and position the fuel dispenser 11.

[0050] A temperature control system (not shown in the figure) is used to regulate and maintain the temperature inside the high and low temperature test chamber 1;

[0051] The fuel circulation system includes an oil tank 3, an oil supply pipeline 4, and an oil return pipeline 6. The inlet end of the fuel dispenser 11 is connected to the oil tank 3 through the oil supply pipeline 4.

[0052] A standard metal measuring vessel 5 has its inlet inserted into the fuel dispenser nozzle 11, and its outlet connected to the oil sump 3 via the return oil pipe 6.

[0053] The sensing system includes a pressure sensor and a first temperature sensor installed on the oil pipeline 4, a second temperature sensor 7 installed in the high and low temperature test chamber 1, and a liquid level sensor and a third temperature sensor 8 installed on the standard metal measuring vessel 5, to obtain the fuel pressure and fuel temperature in the oil pipeline 4, the temperature in the high and low temperature test chamber 1, and the fuel temperature and liquid level in the standard metal measuring vessel 5.

[0054] Specifically, the chamber wall of the high and low temperature test chamber 1 comprises, from the outside to the inside, an outer steel plate layer, an insulation layer, and an inner liner. The front of the high and low temperature test chamber 1 is equipped with a sealed observation window and a door, while the left and right side walls have isolation operation ports 9 and circular holes 10 for pipe runs. In this embodiment, the high and low temperature test chamber 1 has a rectangular structure, 3 meters long, 2.3 meters wide, and 3 meters high. The chamber wall of the high and low temperature test chamber 1 has a three-layer composite structure, consisting of, from the outside to the inside:

[0055] The outer layer of steel plate, of unlimited thickness, mainly serves a supporting and protective function;

[0056] The insulation layer can be made of rigid polyurethane foam, with no limit on its thickness, for effective heat insulation;

[0057] The inner liner is made of stainless steel and is made of corrosion-resistant materials such as SUS304.

[0058] The high and low temperature test chamber 1 has a large sealed observation window and an insulated door on the front of the chamber body. The sealed observation window can be made of double-layered tempered glass. At the center of the left and right side walls of the chamber body, there is an isolation operation port 9 and a round hole 10. The diameter of the round hole 10 is 150mm~200mm, which is used to run oil pipes and sensor cables.

[0059] Preferably, the isolation operation port 9 is equipped with a nitrile rubber glove and sealed by a stainless steel compression flange. In this embodiment, the diameter of the isolation operation port 9 is 150mm~200mm, the temperature resistance range of the matching nitrile rubber glove is -40℃~120℃, and the isolation operation port 9 is sealed to the high and low temperature test chamber 1 by a stainless steel compression flange;

[0060] Preferably, a detachable rubber pad is provided at the circular hole 10, which needs to be plugged with the rubber pad when not in use.

[0061] Preferably, the sample mounting mechanism 2 includes an adjustable bracket and an elastic fixing clamp. The bottom of the adjustable bracket is installed in the high and low temperature test chamber 1 through a shock-absorbing pad. The elastic fixing clamp is set on the adjustable bracket and is used to clamp and fix the fuel dispenser 11 to the adjustable bracket. The adjustable bracket adopts a screw slide structure and can drive the fuel dispenser 11 to move horizontally in the high and low temperature test chamber 1.

[0062] In this embodiment, the adjustable bracket is fixed to the inner bottom plate of the high and low temperature test chamber 1 via shock-absorbing pads at its bottom. The bracket employs a screw-slide structure, where the screw is rotated via a crank or motor, causing the slide, which meshes with the screw, to move precisely along the guide rail in the horizontal plane. The adjustment distance is 0-2 meters, and the slide size is 1m × 1m. An elastic fixing clamp is bolted to the slide, and its clamping part has a V-shaped bayonet and is embedded with a high-temperature resistant silicone shock-absorbing pad. After the fuel dispenser 11 is placed on the slide, tightening the threaded rod of the clamp allows the base of the fuel dispenser 11 to be flexibly clamped from both sides via the shock-absorbing pads, providing both stable fixation and buffering against thermal stress from high and low temperatures and minor vibrations during equipment operation.

[0063] Preferably, the temperature control system includes:

[0064] Cascade refrigeration units are used to provide a low-temperature environment;

[0065] The electric heating unit includes electric heating tubes evenly distributed around the high and low temperature test chamber 1;

[0066] The airflow circulation unit consists of a centrifugal fan and a baffle plate. The centrifugal fan drives the air inside the chamber to flow through the electric heating unit or the cascade refrigeration unit, and then distributes it evenly in the chamber space through the baffle plate.

[0067] In this embodiment, the temperature control system consists of three units that work together: refrigeration, heating, and airflow circulation.

[0068] This cascade refrigeration unit consists of two independent refrigeration cycles: a high-temperature stage and a low-temperature stage. The high-temperature stage provides a cooling environment for the low-temperature stage, enabling even lower temperatures. The two stages are connected by a condenser-evaporator, and the lowest refrigeration temperature can reach -40°C.

[0069] The electric heating unit can use nickel-chromium alloy electric heating tubes, which are evenly distributed around the inner wall of the test chamber and equipped with an external anti-dry-burning protective sleeve. At the same time, PID dynamic regulation is adopted to avoid temperature overshoot, and the maximum heating temperature is 80℃.

[0070] The airflow circulation unit consists of a centrifugal fan and a baffle plate. The centrifugal fan drives the air inside the box to flow through the evaporator or electric heating tube for heat exchange. The baffle plate then distributes the airflow evenly throughout the working space to ensure temperature uniformity.

[0071] Preferably, the first temperature sensor, the second temperature sensor 7, and the third temperature sensor 8 are all PT100 temperature sensors.

[0072] Preferably, there are multiple second temperature sensors 7 distributed around the inner wall of the high and low temperature test chamber 1. In this embodiment, as shown... Figure 2 As shown, eight second temperature sensors 7 are installed around the inner wall of the high and low temperature test chamber 1 to monitor the temperature at various points inside the chamber in real time. The signals from these sensors are transmitted to the PLC controller of the intelligent control system. Based on temperature feedback, the PLC controller uses a PID dynamic adjustment algorithm to precisely control the start and stop of the cascade refrigeration unit and the power output of the electric heating unit. The temperature control accuracy is higher than ±0.5℃, ensuring that the temperature uniformity inside the chamber is ≤2℃.

[0073] Preferably, the standard metal measuring vessel 5 is made of stainless steel, and its outer wall is covered with a first thermal insulation layer to reduce the influence of ambient temperature on the fuel temperature inside the vessel. In this embodiment, the standard metal measuring vessel 5 is made of 1Cr18Ni9Ti stainless steel, with an accuracy class of Class II and a maximum permissible error of ±0.025%. It is equipped with a first thermal insulation layer and comes in three sizes: 20L, 50L, and 100L, which are respectively installed outside the high and low temperature test chamber 1. A PT100 temperature sensor is inserted into the bottom of the standard metal measuring vessel 5, with a measurement range of -50~100℃ and an accuracy class of Class A, for accurately measuring the fuel temperature inside the standard metal measuring vessel 5.

[0074] Preferably, the oil pipeline 4 is made of stainless steel, and its outer wall is covered with a second insulation layer to reduce heat loss. The oil pipeline 4 is equipped with a pressure sensor and a PT100 temperature sensor for real-time monitoring of fuel pressure and oil temperature within the pipeline 4.

[0075] Preferably, the fuel circulation system also includes a variable frequency circulation pump, which can be installed at the outlet of the fuel sump 3 and also serves as a power source to drive the fuel circulation throughout the system.

[0076] Preferably, the high and low temperature test device for the fuel dispenser 11 also includes an intelligent control system, which includes:

[0077] The PLC controller communicates with the temperature control system and the various sensors in the sensing system.

[0078] The touch screen is connected to the PLC controller for parameter setting and display.

[0079] The data storage and analysis module, which communicates with the PLC controller, is used to record test data and calculate the indication error of the fuel dispenser 11; and

[0080] The remote communication module is used to support remote monitoring and anomaly alarms on mobile terminals.

[0081] In this embodiment, the intelligent control system is based on a PLC controller. The PLC controller communicates with the temperature regulation system, the circulation pump of the fuel circulation system, and all sensors of the sensing system through input / output modules.

[0082] The touchscreen display connects to the PLC controller and supports switching between multiple interfaces, including a parameter setting interface, a real-time monitoring interface, and a data query interface. The parameter setting interface allows users to set target values ​​for temperature and humidity. The real-time monitoring interface dynamically displays temperature and humidity change curves in the form of icons. The data query interface supports retrieving and exporting historical data by experiment date and sample number.

[0083] The data storage and analysis module records all test data and can calculate the actual volume of the standard measuring vessel based on the collected data such as the temperature inside the high and low temperature test chamber 1, the fuel pressure and temperature in the oil pipeline 4, and the fuel temperature and liquid level in the standard metal measuring vessel 5. The calculated volume is then compared with the value displayed on the fuel dispenser, and a report is generated.

[0084] The data storage and analysis module uses an industrial-grade solid-state drive with a storage capacity of no less than 1TB. It can save key test parameters such as temperature, pressure, and fuel dispenser readings, and also has data encryption capabilities to ensure the security of test data.

[0085] The remote communication module supports sending control commands via a mobile terminal APP to enable remote operations such as starting, pausing, and modifying parameters of the test, and can push abnormal status reminders such as temperature and humidity.

[0086] It should be noted that each module / unit involved in this utility model (such as PLC controller, touch screen, specific type of sensor, etc.) adopts general-purpose hardware products or existing modules known in the technical field. The improvement of this utility model lies in the specific connection relationship between the above-mentioned existing modules, the cooperative working method, and the non-obvious technical effects produced in the whole system, and does not involve any improvement to the internal software algorithm or calculation method of any module.

[0087] The following example illustrates the testing process of this utility model.

[0088] Taking fuel dispenser 11 as an example, the following steps are taken to verify the 40L / min flow rate point and measure its indication error at 55℃:

[0089] S1. Sample mounting and arrangement of standard metal measuring instruments 5:

[0090] Place the fuel dispenser 11 on the adjustable bracket in the high and low temperature test chamber 1, and adjust the position of the fuel dispenser 11 by adjusting the adjustable bracket so that the fuel dispenser 11 is close to the side of the high and low temperature test chamber 1 near the isolation operation port 9 with nitrile rubber gloves.

[0091] Place the standard metal measuring instrument 5 outside the high and low temperature test chamber 1, near the side circular hole 10 of the high and low temperature test chamber 1;

[0092] The fuel dispenser 11 is connected to the oil tank 3 through the oil pipeline 4. The oil pipeline 4 passes through the round hole 10 on the side of the high and low temperature test chamber 1 away from the standard metal measuring instrument 5.

[0093] The drain port of the standard metal measuring vessel 5 is connected to the oil tank 3 through the oil return pipe 6;

[0094] Close the door of the high and low temperature test chamber 1.

[0095] S2, Parameter Settings:

[0096] Set system parameters via the touchscreen display: test temperature: 55℃, holding time: 2h;

[0097] The PLC controller starts the temperature regulation system, the electric heating unit starts working, the second temperature sensor 7 collects the temperature data inside the chamber in real time and feeds it back to the PLC controller to realize closed-loop temperature control. After the temperature inside the chamber reaches the set value, it enters the heat preservation stage.

[0098] S3, Metrological Test:

[0099] After the heat preservation time reaches 2 hours, the high and low temperature test chamber 1 will immediately send a command via mobile APP to remind the tester that the test can start the verification.

[0100] The tester starts the fuel dispenser 11, reaches into the high and low temperature test chamber 1 through nitrile rubber gloves, sets the refueling volume to 50L, and takes the fuel nozzle of the fuel dispenser 11 out of the round hole 10 and inserts it into the standard metal measuring vessel 5.

[0101] Start the inspection: the fuel dispenser 11 fills the standard metal measuring container 5 with fuel.

[0102] After refueling is complete, hang the fuel nozzle back onto the fuel dispenser 11 through the round hole 10 to complete the verification.

[0103] S4. Data Acquisition and Analysis

[0104] During the calibration process, the intelligent control system simultaneously acquires data from each sensor, including the temperature inside the high and low temperature test chamber 1, the fuel pressure in the fuel pipeline 4, the fuel temperature in the fuel pipeline 4, the fuel temperature in the standard metal measuring vessel 5, and the liquid level in the standard metal measuring vessel 5. It then calculates the actual volume of the standard measuring vessel, compares it with the value displayed on the fuel dispenser, and calculates the indication error according to the following formula:

[0105] In the formula: The relative indication error of fuel dispenser 11 is % %. For fuel dispenser 11 The volume reading below, in L; The nominal volume of standard metal measuring instrument 5 is in liters (L). The measuring head and neck graduation volume of standard metal measuring instrument 5, mL / mm; The liquid level height of the standard metal measuring vessel 5 is in mm; The main scale graduation for the nominal capacity of standard metal measuring instrument 5 at 20℃ is in mm; To determine the volumetric expansion coefficient of the medium, For gasoline medium, take ; Let be the coefficient of volumetric expansion of the measuring instrument material. ,Pick ; The temperature of the fuel oil inside pipeline 4. ; The fuel temperature is measured in the standard metal measuring vessel 5. .

[0106] It should be noted that the formula used in this invention to calculate the indication error of the fuel dispenser is a well-known and recognized standard calculation method in the fields of metrology and engineering measurement. It is derived from a combination of JJG 443-2023 Fuel Dispenser Verification Procedure (implementation) and JJG 259-2005 Standard Metal Measuring Instrument Verification Procedure. In this device, this formula is built into the data storage and analysis module of the intelligent control system. "Built into" here should be understood as meaning that this module, as a general-purpose hardware computing unit (such as an industrial computer, embedded processor, etc.), performs a mature, existing calculation task by loading and running a program containing this standard formula. The core innovation of this invention lies in the hardware platform construction for implementing this calculation and its collaborative connection with the various sensors and actuators of the entire experimental device, rather than an improvement to the calculation formula or algorithm logic. For those skilled in the art, programming the formula on a selected hardware platform is a conventional and inventive method. Therefore, the scope of protection of this invention does not extend to the calculation program itself.

[0107] It can also generate reports of temperature change curves, record the original error of fuel dispenser 11 at a set temperature point, and support data export and printing.

[0108] S5, End of Test

[0109] After adjusting the temperature inside the high and low temperature test chamber 1 to room temperature, shut down the system, open the hatch, disassemble the oil supply pipe 4, the return oil pipe 6 and the fuel dispenser 11, and clean up the test site.

[0110] In summary, the high and low temperature test device for the fuel dispenser 11 provided by this utility model ensures high temperature uniformity and stability within the test chamber through the coordinated operation of cascade refrigeration, PID temperature control, multi-point temperature sensors, and a forced airflow circulation system. This precise temperature control capability provides a stable and reliable testing environment for the fuel dispenser. Simultaneously, the intelligent control system acquires data such as fuel pressure and temperature in the fuel delivery pipeline and fuel temperature and level in the standard metal measuring vessel collected by various sensors, and calculates the indication error, avoiding potential misreading and miscalculation problems that may occur with traditional manual recording, thus comprehensively improving the accuracy and reliability of the test results.

[0111] The above description is merely a description of a preferred embodiment of the present invention and is not intended to limit the scope of the present invention in any way. Any changes or modifications made by those skilled in the art based on the above disclosure shall fall within the protection scope of the present invention. Obviously, those skilled in the art can make various modifications and variations to the present invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the present invention and its equivalents, the present invention also intends to include these modifications and variations.

Claims

1. A high and low temperature testing device for a fuel dispenser, characterized in that, include: The high and low temperature test chamber has a sealed and insulated structure. The sample mounting mechanism, located inside the high and low temperature test chamber, is used to install and position the fuel dispenser; A temperature control system is used to regulate and maintain the temperature inside the high and low temperature test chamber; The fuel circulation system includes an oil sump, an oil delivery pipeline, and a return oil pipeline. The inlet end of the fuel dispenser is connected to the oil sump through the oil delivery pipeline. A standard metal measuring vessel, the inlet of which is inserted into the fuel dispenser nozzle, and the outlet of which is connected to the oil sump through the return oil pipe; The sensing system includes a pressure sensor and a first temperature sensor installed on the oil pipeline, a second temperature sensor installed in the high and low temperature test chamber, and a level sensor and a third temperature sensor installed on the standard metal measuring vessel, to obtain the fuel pressure and fuel temperature in the oil pipeline, the temperature in the high and low temperature test chamber, and the fuel temperature and liquid level in the standard metal measuring vessel.

2. The high and low temperature testing device for fuel dispensers according to claim 1, characterized in that, The high and low temperature test chamber has a steel plate outer layer, an insulation layer and an inner liner from the outside to the inside. The front of the high and low temperature test chamber is provided with a sealed observation window and a door, and the left and right side walls are provided with isolation operation ports and round holes for pipelines.

3. The high and low temperature testing device for fuel dispensers according to claim 2, characterized in that, The isolation port is equipped with nitrile rubber gloves and is sealed by a stainless steel compression flange.

4. The high and low temperature testing device for fuel dispensers according to claim 2, characterized in that, A detachable rubber pad is provided at the circular hole.

5. The high and low temperature testing device for fuel dispensers according to claim 1, characterized in that, The sample mounting mechanism includes an adjustable bracket and an elastic fixing clamp. The bottom of the adjustable bracket is installed inside the high and low temperature test chamber via a shock-absorbing pad. The elastic fixing clamp is set on the adjustable bracket and is used to clamp and fix the fuel dispenser to the adjustable bracket. The adjustable bracket adopts a screw slide structure and can drive the fuel dispenser to move horizontally within the high and low temperature test chamber.

6. The high and low temperature testing device for fuel dispensers according to claim 1, characterized in that, The temperature control system includes: Cascade refrigeration units are used to provide a low-temperature environment; The electric heating unit includes electric heating tubes evenly distributed around the high and low temperature test chamber; The airflow circulation unit consists of a centrifugal fan and a baffle plate. The centrifugal fan drives the air inside the box to flow through the electric heating unit or the cascade refrigeration unit, and then distributes it evenly in the box space through the baffle plate.

7. The high and low temperature testing device for fuel dispensers according to claim 1, characterized in that, The second temperature sensor is multiple and distributed around the inner wall of the high and low temperature test chamber.

8. The high and low temperature testing device for fuel dispensers according to claim 1, characterized in that, The standard metal measuring instrument is made of stainless steel, and its outer wall is covered with a first insulation layer.

9. The high and low temperature testing device for fuel dispensers according to claim 1, characterized in that, The oil pipeline is made of stainless steel, and its outer wall is covered with a second insulation layer.

10. The high and low temperature testing device for fuel dispensers according to claim 1, characterized in that, The high and low temperature test device for the fuel dispenser also includes an intelligent control system, which includes: The PLC controller is communicatively connected to the temperature control system and each sensor in the sensing system. The touch screen is communicatively connected to the PLC controller and is used for parameter setting and display. The data storage and analysis module, communicating with the PLC controller, is used to record test data and calculate the indication error of the fuel dispenser; and The remote communication module is used to support remote monitoring and anomaly alarms on mobile terminals.

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