Standard test pipeline for heat exchange performance test of sample piece

Abstract

The invention belongs to the technical field of automobiles, and discloses a sample piece heat exchange performance test standard test pipeline. The test pipeline comprises a test pipe fitting, a pressure test piece and a temperature test piece, the test pipe fitting is connected between the experiment bench and the test sample piece, and an overflowing channel for a test medium to pass through is arranged in the test pipe fitting; the pressure test piece is installed on the test pipe fitting and used for detecting the pressure of a test medium, and the distance between the pressure test piece and the test sample piece is 3-10 times of the pipe diameter of the test pipe fitting in the axis direction of the test pipe fitting; the temperature test piece is used for detecting the temperature of a test medium, a mounting hole for mounting the temperature test piece is formed in the test pipe fitting, the test pipe fitting is in a straight cylinder shape, and the axis of the mounting hole is perpendicular to the pipe axis of the test pipe fitting; or the test pipe fitting is in a bent pipe shape, and the axis of the mounting hole is parallel to the pipe axis of the test pipe fitting. Through the above arrangement, the accuracy of the pressure test is improved, and the accuracy of the temperature detection result is improved.

Description

Technical Field

[0001] The present invention relates to the field of automobile technology, and in particular to a standard test pipeline for a sample heat exchange performance test. Background Art

[0002] Early laboratory test tubes were divided into two types: the first type was used for test media such as oil, compressed air, or water, and the second type was used for test media such as refrigerants. Typically, the first type of test tube has a small hole at one end that is connected to a differential pressure sensor for testing the resistance of the sample; the other end has a small hole into which a temperature sensor is vertically inserted to test the temperature of the medium flowing through the test tube. Two identical test tubes form a set of test tubes, which are used to measure the resistance of the sample and the temperature of the medium entering and leaving the sample. The second type of test tube has an opening with a T-connector installed on it. One end of the T-connector is connected to a pressure sensor for testing pressure, and the other end is vertically inserted into a temperature sensor for testing the temperature of the refrigerant flowing through the test tube. The above-mentioned temperature and pressure parameters serve as both test control parameters and are also important calculation parameters for testing the heat transfer performance of the test sample.

[0003] However, during the use of the first or second test pipeline, at least the following two common problems were found: (1) When the temperature sensor has inaccurate data due to aging, damage, etc., it cannot be discovered in time, resulting in inaccurate measured heat exchange performance; (2) When the diameter of the test pipeline is small, the operation requirements for the insertion depth of the temperature sensor are high, and it relies too much on personnel experience, resulting in a lack of installation stability, which affects the experimental results.

[0004] Based on this, it is necessary to design a standard test pipeline for sample heat exchange performance testing to solve the problems existing in the existing technology. Summary of the Invention

[0005] The purpose of the present invention is to provide a standard test pipeline for testing the heat exchange performance of a sample, which can improve the measurement accuracy of the experimental results and improve the test efficiency.

[0006] To achieve this object, the present invention adopts the following technical solutions:

[0007] Standard test pipeline for sample heat transfer performance test, including:

[0008] A test pipe is connected between the test bench and the test sample, and the test pipe has a flow channel for the test medium to pass through;

[0009] A pressure test piece is installed on the test pipe and is used to detect the pressure of the test medium. Along the axis of the test pipe, the distance between the pressure test piece and the test sample is 3-10 times the diameter of the test pipe;

[0010] A temperature test piece is used to detect the temperature of the test medium. The test tube is provided with a mounting hole for mounting the temperature test piece. The test tube is in the shape of a straight tube, and the axis of the mounting hole is perpendicular to the tube axis of the test tube; or, the test tube is in the shape of a curved tube, and the axis of the mounting hole is parallel to the tube axis of the test tube.

[0011] Preferably, a plurality of first flow holes are evenly arranged on the test tube along the circumferential direction of the test tube;

[0012] The pressure test piece includes a pressure ring, a pressure joint and a pressure sensor. The pressure ring is sleeved on the test pipe. A flow gap is provided between the pressure ring and the test pipe, and a flow opening is provided on the pressure ring. The flow opening is communicated with the flow gap. The two ends of the pressure joint are respectively connected to the pressure ring and the pressure sensor. A sensing channel for communicating the pressure sensor and the flow opening is provided in the pressure joint. The pressure sensor can detect the pressure of the test medium through the sensing channel.

[0013] Preferably, four first flow holes are provided.

[0014] Preferably, the temperature test piece includes a fixing frame, a temperature sensor sealing joint and a temperature sensor, the fixing frame and the temperature sensor sealing joint are both arranged on the test pipe, and the fixing frame is used to fix the wiring harness of the temperature sensor, and the temperature sensor sealing joint is used to install the temperature sensor.

[0015] Preferably, the temperature test piece includes two temperature sensor sealing joints and two temperature sensors, and the two temperature sensor sealing joints are correspondingly arranged with the two temperature sensors;

[0016] The test tube is in a straight tube shape, and along a direction perpendicular to the tube axis of the test tube, the two temperature sensor sealing joints are symmetrically arranged on both sides of the test tube;

[0017] Alternatively, the test tube is in the shape of a curved tube and includes a curved portion and a straight portion, a straight portion is provided at each end of the curved portion, the straight portion close to the test specimen is connected to the pressure test piece, one of the temperature sensor sealing joints is provided at the intersection of the curved portion and one of the straight portions, and one of the temperature sensor sealing joints is parallel to the axis of the curved portion, another temperature sensor sealing joint is provided on the curved portion, and the other temperature sensor sealing joint is parallel to the axis of the other straight portion.

[0018] Preferably, the test pipe further comprises:

[0019] a first connecting member, the first connecting member being provided on one end of the test tube close to the test sample and being used for sealingly connecting the test tube and the test sample;

[0020] a second connecting piece, the second connecting piece being provided on one end of the test tube close to the experimental bench and being used for sealingly connecting the test tube and the experimental bench;

[0021] The first connecting piece is a flange or a pipe joint; and / or the second connecting piece is a flange or a pipe joint.

[0022] Preferably, the test pipe fitting includes a first pipeline and a second pipeline connected in series, the first pipeline is closer to the test sample than the second pipeline, the diameter of the first pipeline is equal to the diameter of the test sample, and the diameter of the first pipeline is different from the diameter of the second pipeline, the first pipeline is a straight pipe, and the second pipeline is a straight pipe or a curved pipe, the first connecting piece and the pressure testing piece are provided on the first pipeline, and the second connecting piece and the temperature testing piece are provided on the second pipeline.

[0023] Preferably, the test pipe further includes a third connecting piece, and each of the first pipeline and the second pipeline is provided with a third connecting piece, and the third connecting piece is used to seal and connect the first pipeline and the second pipeline; both the third connecting pieces are flanges or pipe joints.

[0024] Preferably, a second flow hole is provided on the first pipeline;

[0025] The pressure test piece includes a pressure joint and a pressure sensor. The pressure joint is connected to the second flow hole. The pressure sensor is installed on the pressure joint and is used to detect the pressure of the test medium.

[0026] Preferably, the temperature test piece includes a temperature sensor sealing joint and a temperature sensor;

[0027] The second pipeline is in the shape of a curved tube and includes a bending portion and a straightening portion. The two ends of the bending portion are respectively connected to one of the straightening portions. The straightening portion close to the test sample is connected to the pressure test piece. The temperature sensor sealing joint is provided at the junction of the bending portion and one of the straightening portions.

[0028] The beneficial effects of the present invention are:

[0029] The present invention provides a standard test pipeline for testing the heat exchange performance of a sample, which includes a test pipe, a pressure test piece, and a temperature test piece. The test pipe is connected between a test bench and a test sample, and has a flow channel for a test medium to pass through in the test pipe; the pressure test piece is installed on the test pipe and is used to detect the pressure of the test medium. Along the axial direction of the test pipe, the spacing between the pressure test piece and the test sample is 3-10 times the diameter of the test pipe; the temperature test piece is used to detect the temperature of the test medium. The test pipe is provided with a mounting hole for mounting the temperature test piece. The test pipe is in the shape of a straight tube, and the axis of the mounting hole is perpendicular to the axis of the test pipe; or the test pipe is in the shape of a curved tube, and the axis of the mounting hole is parallel to the axis of the test pipe. Through the above-mentioned arrangement, the accuracy of the pressure test is improved, and it also helps to improve the accuracy of the temperature detection result. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a structural schematic diagram of a test pipeline provided by the first embodiment of the present invention when the test pipe is a straight pipe;

[0031] Figure 2 1 is a schematic structural diagram of a test pipe provided in the first embodiment of the present invention when the test pipe is in the shape of a curved pipe;

[0032] Figure 3 This is a cross-sectional view of the structure of the test pipe and the pressure test piece after assembly provided by the first embodiment of the present invention;

[0033] Figure 4 This is a structural diagram of a second embodiment of the present invention when both ends of the first pipeline are a pipe joint and a flange respectively;

[0034] Figure 5 This is a structural diagram of the second embodiment of the present invention when both ends of the first pipeline are flanges;

[0035] Figure 6 This is a structural diagram of the second embodiment of the present invention when both ends of the first pipeline are pipe joints;

[0036] Figure 7 This is a structural diagram of a second embodiment of the present invention when the second pipeline is in a straight pipe shape and is provided with two temperature test pieces;

[0037] Figure 8 This is a structural diagram of the second embodiment of the present invention when the second pipeline is in a curved pipe shape with a pipe joint and a flange at both ends;

[0038] Figure 9 This is a structural diagram of the second embodiment of the present invention when the second pipeline is in the shape of a curved pipe with flanges at both ends;

[0039] Figure 10 This is a structural diagram of a second embodiment of the present invention when the second pipeline is in a straight pipe shape and is provided with a pressure test piece;

[0040] Figure 11 This is a structural diagram provided by the second embodiment of the present invention when the second pipeline is in a curved pipe shape and is provided with a temperature testing piece.

[0041] In the picture:

[0042] 1. Test pipe; 101. First pipe; 102. Second pipe; 1021. Bend; 1022. Alignment; 11. Flow channel; 12. First flow hole; 13. Bend; 14. Straight portion; 15. First connector; 16. Second connector; 17. Third connector.

[0043] 2. Pressure test piece; 20. Flow gap; 21. Pressure ring; 211. Flow opening; 22. Pressure connector; 221. Sensing channel;

[0044] 3. Temperature test piece; 31. Fixing bracket; 32. Temperature sensor sealing joint. DETAILED DESCRIPTION

[0045] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It will be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all structures.

[0046] In the description of the present invention, unless otherwise expressly specified or limited, the terms "connected," "connected," and "fixed" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention in specific circumstances.

[0047] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Furthermore, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0048] In the description of this embodiment, terms such as "upper," "lower," "right," and "left" are used to refer to positions or locations based on those shown in the accompanying drawings. These terms are intended solely to facilitate description and simplify operation, and are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meaning.

[0049] The technical solution provided by the present invention is described in detail below with reference to the accompanying drawings and specific implementation methods.

[0050] Example 1

[0051] Combine Figures 1 to 3 As shown, this embodiment provides a standard test pipeline for testing heat exchange performance of samples (hereinafter referred to as "test pipeline" for ease of description), which can perform standardized tests on heat exchange performance of other types of heat exchange components such as vehicle air conditioners and cooling systems.

[0052] It should be noted in advance that when the heat exchange component is used as a refrigeration component, it is necessary to capture, record and calculate the temperature and pressure parameters of the test medium flowing into and out of the refrigeration component respectively, and obtain the cooling performance of the refrigeration component based on the calculation results. Therefore, it is necessary to install two test pipelines in the refrigeration component, one of which is installed between the inlet of the refrigeration component and the test bench, and the other is installed between the outlet of the refrigeration component and the test bench, so that the test medium can circulate between the test bench, the refrigeration component and the two test pipelines. By way of example, the test pipeline provided in this embodiment will be specifically introduced below, taking the test pipeline located at the upstream end of the refrigeration component as an example.

[0053] Specifically, the test pipeline mainly includes a test pipe 1, a pressure test piece 2, and a temperature test piece 3. The test pipe 1 is connected between the experimental bench and the test sample, and the test pipe 1 has a flow channel 11 for the test medium to pass through. The pressure test piece 2 is installed on the test pipe 1 and is used to detect the pressure of the test medium. Along the axial direction of the test pipe 1, the distance between the pressure test piece 2 and the test sample is 3-10 times the diameter of the test pipe 1. In this embodiment, the pressure test is performed by punching holes in the wall of the test pipe 1. This method requires a sufficiently long steady flow section between the pressure test piece 2 and the test sample, and there must be no changes in diameter or turns before and after to ensure accurate measurement. Based on this, by setting the distance between the pressure test piece 2 and the test sample to 3-10 times the diameter of the test pipe 1, a sufficiently long steady flow section can be guaranteed, ensuring that the test medium flows stably between the pressure test piece 2 and the test sample, which helps to improve the accuracy of the pressure test.

[0054] The temperature test piece 3 is used to detect the temperature of the test medium, and the test tube 1 is provided with a mounting hole for mounting the temperature test piece 3. In this embodiment, the temperature test piece 3 has different mounting methods according to the shape of the test tube 1: for example, Figure 1 As shown, when the test medium is compressed air, oil or water, the diameter of the test pipe 1 is generally large. In this case, the test pipe 1 is designed to be a straight pipe for ease of manufacturing. In this case, the axis of the mounting hole must be perpendicular to the axis of the test pipe 1. Opening the mounting hole on the straight wall of the test pipe 1 is more convenient and less difficult. Figure 2 As shown, when the test tube 1 is a curved tube, the axis of the mounting hole needs to be parallel to the tube axis of the test tube 1, so that the temperature test piece 3 can be inserted into the curved part of the test tube 1 in an inclined posture, thereby ensuring that the temperature sensing contact set at the end of the temperature test piece 3 will not affect the test result due to being inserted too deep or too shallow, thereby improving the accuracy of the temperature measurement of the temperature test piece 3.

[0055] Optionally, in this embodiment, refer to Figure 3 As shown, when the diameter of the test tube 1 is large, a plurality of first flow holes 12 are evenly arranged on the test tube 1 along the circumferential direction of the test tube 1; the pressure test piece 2 includes a pressure ring 21, a pressure joint 22 and a pressure sensor, the pressure ring 21 is sleeved on the test tube 1, a flow gap 20 is provided between the pressure ring 21 and the test tube 1, and a flow opening 211 is provided on the pressure ring 21, and the flow opening 211 is connected to the flow gap 20; the two ends of the pressure joint 22 are respectively connected to the pressure ring 21 and the pressure sensor, and a sensing channel 221 for connecting the pressure sensor and the flow opening 211 is provided in the pressure joint 22, and the pressure sensor can detect the pressure of the test medium through the sensing channel 221. When the diameter of the test tube 1 is large, the pressure sensor can evenly collect the pressure of the test medium flowing through the test tube 1 by the above-mentioned multi-point punching method. Compared with the single-point punching method used in the related art, the measured pressure data will be more accurate.

[0056] Preferably, four first flow holes 12 are provided to ensure that pressure information at different positions of the test pipe 1 can be accurately collected, which helps to improve the accuracy and reliability of the test results.

[0057] Optionally, combined Figure 1 、 Figure 2As shown, the temperature test piece 3 includes a mounting bracket 31, a temperature sensor sealing connector 32, and a temperature sensor. Both the mounting bracket 31 and the temperature sensor sealing connector 32 are mounted on the test tube 1. The mounting bracket 31 secures the temperature sensor wiring harness, ensuring that the wires are supported and secured by the mounting bracket 31, preventing them from bending and damage. The mounting bracket 31 also serves as a hanging fixture for collecting and managing the test pipe, preventing disorganization. The temperature sensor sealing connector 32 is used to mount the temperature sensor.

[0058] Optionally, refer to Figure 1 As shown, in this embodiment, when the test tube 1 has a large diameter and is in a straight tube shape, the temperature test piece 3 includes two temperature sensor sealing joints 32 and two temperature sensors. The two temperature sensor sealing joints 32 are arranged corresponding to the two temperature sensors. Along the direction perpendicular to the tube axis of the test tube 1, the two temperature sensor sealing joints 32 are symmetrically arranged on both sides of the second pipeline 10221; Figure 2 As shown, when the test tube 1 has a large diameter and is in the shape of a curved tube, the test tube 1 includes a curved portion 13 and a straight portion 14. The curved portion 13 is Z-shaped, and a straight portion 14 is provided at each end of the curved portion 13. A temperature sensor sealing joint 32 is provided at the intersection of the curved portion 13 and one of the straight portions 14, and the temperature sensor sealing joint 32 is parallel to the axis of the curved portion 13. Another temperature sensor sealing joint 32 is provided on the curved portion 13, and the other temperature sensor sealing joint 32 is parallel to the axis of the other straight portion 14, thereby achieving the purpose of setting the axis of the temperature sensor sealing joint 32 parallel to the axis of the test pipe. In this way, the temperature sensor inserted into the temperature sensor sealing joint 32 can extend into the test tube 1 along the length direction of the curved portion 13 and the straight portion 14 respectively, without touching the pipe wall, ensuring safety in use.

[0059] By installing the two temperature test pieces 3 described above, errors caused by local temperature changes or uneven flow of the test medium can be effectively avoided, thereby improving the test accuracy and reliability of the test pipeline. Moreover, the temperature data measured by the two temperature sensors can be compared, and theoretically should be consistent. When the comparison difference exceeds a certain range, it can be determined that one of the temperature sensors has inaccurate monitoring data due to aging, damage, or other reasons, so that it can be discovered and replaced in a timely manner. Mutual supervision helps to ensure the accuracy of the measured temperature. Furthermore, in this embodiment, both temperature sensors use PT temperature sensors with a diameter of 1.5 mm to avoid the diversification of temperature sensors. By purchasing the same spare parts, expenses can be effectively saved.

[0060] Optionally, in this embodiment, the test tube 1 further includes a first connector 15 and a second connector 16, wherein the first connector 15 is disposed on one end of the test tube 1 close to the test sample and is used to seal the test tube 1 and the test sample; the second connector 16 is disposed on one end of the test tube 1 close to the test bench and is used to seal the test tube 1 and the test bench to complete the sealed connection of the test tube 1 between the test sample and the test bench. The specific structures of the first connector 15 and the second connector 16 are based on the matching parts on the test sample and the test bench, that is, when the matching part of the connecting pipe on the test sample is a flange or a pipe joint, the first connector 15 is a flange or a pipe joint; when the matching part on the test bench is a flange or a pipe joint, the second connector 16 is a flange or a pipe joint, so as to ensure that the test tube 1 can be connected to the test sample and the test bench under different test conditions by configuring the first connector 15 and the second connector 16 with different structures, thereby improving the adaptability of the test tube 1.

[0061] Example 2

[0062] In this embodiment, the diameter of the portion of the test tube 1 where the temperature test piece 3 is provided is smaller than the diameter of the test sample. In order to ensure that the portion of the test tube 1 where the pressure test piece 2 is provided can be stably and sealedly connected to the test sample and to reduce consumables, the test tube 1 needs to be divided into sections so that the test tube 1 where the temperature test piece 3 is provided can continue to be used, thereby reducing material waste.

[0063] Combine Figures 4 to 11 As shown, the test tube 1 includes a first tube 101 and a second tube 102 connected in series. The first tube 101 is closer to the test specimen than the second tube 102. The diameter of the first tube 101 is equal to the diameter of the test specimen, and the diameter of the first tube 101 is different from the diameter of the second tube 102. The first tube 101 is provided with the aforementioned first connector 15 and pressure test piece 2, while the second tube 102 is provided with the aforementioned second connector 16 and temperature test piece 3. The provision of the first tube 101 and the second tube 102 ensures a stable and sealed connection between the test tube 1 and the test specimen, avoiding leakage of the test medium or unstable connection due to mismatched tube diameters, and preventing inaccurate pressure and temperature tests. At the same time, it also ensures that the portion where the temperature test piece 3 is located can continue to be used, avoiding unnecessary material waste.

[0064] The test tube 1 provided in this embodiment also includes a third connector 17. A third connector 17 is provided on each of the first and second tubes 101, 102. The third connector 17 is used to seal and connect the first and second tubes 101, 102, ensuring a secure connection between the first and second tubes 101, 102 and significantly reducing the possibility of leakage of the test medium from the test tube 1 during flow. It should be noted that the two third connectors 17 are identical in structure. That is, when one of the third connectors 17 is a flange, the other is also a flange; and when one of the third connectors 17 is a pipe joint, the other is also a pipe joint. This avoids the situation where a loose or inconsistent connection between the two due to different types of connectors is present. It also facilitates unified management and maintenance of the first and second tubes 101, 102 and accommodates diverse installation methods.

[0065] Combine Figures 4 to 9 As shown, when the test medium in the test pipe 1 is compressed air, oil or water, for example, the first pipe 101 and the second pipe 102 are both straight pipes, and flanges are provided on the test sample and the experimental bench: Figure 4 、 Figure 7 As shown, the first pipeline 101 is provided with a flange at one end close to the test sample and a pipe joint at one end away from the test sample, and the second pipeline 102 is provided with a pipe joint at one end close to the first pipeline 101 and a flange at one end away from the first pipeline 101; or, a combination of Figure 5 、 Figure 7 As shown, the first pipeline 101 is provided with a flange at one end close to the test sample and a flange at one end away from the test sample; the second pipeline 102 is provided with a flange at one end close to the first pipeline 101 and a flange at one end away from the first pipeline 101.

[0066] For example, the first pipeline 101 and the second pipeline 102 are both straight pipes, and the test sample is provided with a pipe joint, and the test bench is provided with a flange: Figure 6 、 Figure 7 As shown, a pipe joint is provided on the end of the first pipeline 101 close to the test sample and a pipe joint is provided on the end away from the test sample. A pipe joint is provided on the end of the second pipeline 102 close to the first pipeline 101 and a flange is provided on the end away from the first pipeline 101.

[0067] For example, the first pipeline 101 is a straight pipe, the second pipeline 102 is a curved pipe, and a pipe joint is provided on the test sample and a flange is provided on the test bench: Figure 6 、 Figure 8As shown, a pipe joint is provided on the end of the first pipeline 101 close to the test sample and a pipe joint is provided on the end away from the test sample. A pipe joint is provided on the end of the second pipeline 102 close to the first pipeline 101 and a flange is provided on the end away from the first pipeline 101.

[0068] For example, when the first pipeline 101 is a straight pipe, the second pipeline 102 is a curved pipe, and flanges are provided on the test sample and the experimental bench: Figure 5 、 Figure 9 As shown, flanges are provided at both ends of the first pipeline 101, and flanges are provided at both ends of the second pipeline 102.

[0069] The following are the steps for installing the test tube 1 between the test bench and the test sample when the test medium in the test tube 1 is compressed air, oil, or water, and the first pipe 101 and the second pipe 102 are both straight pipes:

[0070] Four first flow holes 12 with a diameter of 1 mm are evenly opened along the circumferential direction on the first pipeline 101. The distance between the first flow holes 12 and the test sample is three times the length of the test sample diameter. The pressure ring 21 is sleeved on the position where the first flow holes 12 are opened on the first pipeline 101, and the pressure ring 21 is welded to the first pipeline 101. Then, the pressure sensor is connected to the pressure joint 22. Two 1.5 mm mounting holes are opened on the second pipeline 102 near the experimental bench. The temperature sensor sealing joint 32 is welded. Two temperature sensors of the same model are inserted into the two mounting holes along the drilling direction and inserted into the pipe axis position of the second pipeline 102. Then, a fixing bracket 31 is welded to the position where the temperature sensors are respectively set. The wiring harness of the temperature sensor is limited and connected to the fixing bracket 31, so that the wiring harness of the temperature sensor can be fixed and protected. Next, referring to the test sample and the experimental bench, select the appropriate first connecting member 15, second connecting member 16 and third connecting member 17, connect the first pipeline 101 to the test sample through the first connecting member 15, connect the second pipeline 102 to the experimental bench through the second connecting member 16, and finally seal the first pipeline 101 and the second pipeline 102 through the third connecting member 17. In this way, the test pipeline is installed.

[0071] Combine Figures 10 and 11 As shown, when the test medium in the test tube 1 is a refrigerant, only one second flow hole is provided on the first pipe 101, and the pressure of the test medium is detected by a single-point punching method. Figure 10As shown, the pressure test piece 2 includes a pressure connector 22 and a pressure sensor. The pressure connector 22 is connected to the second flow hole. The pressure sensor is mounted on the pressure connector 22 so that the pressure sensor can detect the pressure of the test medium flowing through the first pipeline 101. This arrangement can eliminate the need for pressure ring 21, meeting the requirements of actual working pressure detection while also helping to simplify the structure of the test pipeline.

[0072] refer to Figure 11 As shown, the temperature test piece 3 includes a temperature sensor sealing joint 32 and a temperature sensor. Since the diameter of the test pipeline used to detect the refrigerant is generally small, the use of a temperature test piece 3 and a second flow hole can meet the requirements of accurately detecting the temperature and pressure of the test medium.

[0073] Continue to refer Figure 11 As shown, to avoid the difficulty of inserting the temperature sensor when the pipe diameter is small, in this embodiment, the second pipe 102 is preferably in the shape of a curved pipe and includes a bend portion 1021 and a collimating portion 1022. A collimating portion 1022 is connected to each end of the bend portion 1021. The collimating portion 1022 closer to the test sample is connected to the first pipe 101. A temperature sensor sealing joint 32 is provided at the junction of the bend portion 1021 and the collimating portion 1022 closer to the test sample. The axis of the temperature sensor sealing joint 32 is parallel to the pipe axis of the bend portion 1021. Through this arrangement, the test pipe can ensure that when the angle between the bend portion 1021 and the collimating portion 1022 changes, the temperature sensor sealing joint 32 can always remain parallel to the pipe axis of the bend portion 1021, thereby ensuring the accuracy of temperature detection, while controlling the cost of setting up the temperature sensor.

[0074] The following are the steps for installing the test tube 1 between the test bench and the test sample when the test medium in the test tube 1 is a refrigerant, the first pipe 101 is a straight pipe, and the second pipe 102 is a curved pipe:

[0075] In the first pipeline 101, the length of the first pipeline 101 is approximately 100 mm, and a first flow hole 12 with a diameter of 3 mm is opened on the first pipeline 101. The pressure joint 22 is welded to the first flow hole 12. The distance between the pressure joint 22 and the test sample is three times the diameter of the first pipeline 101. The pressure sensor is then connected to the pressure joint 22. In the second pipeline 102, the length of the collimating portion 1022 set between the bend 1021 and the experimental bench is 120 mm, the bending angle of the bend 1021 is 130 degrees, and the length of the collimating portion 1022 set between the bend 1021 and the first pipeline 101 is 60 mm. At the intersection of the bend 1021 and the 60 mm long collimating portion 1022, a mounting hole with a diameter of 1.6 mm is opened along the pipe axis direction of the bend 1021, and a temperature sensor sealing joint 32 is welded. , insert the temperature sensor of the same model along the punching direction to the pipe axis position of the bent part 1021, and finally refer to the first pipeline 101 and the experimental bench to select the appropriate second connector 16 and third connector 17, connect the first pipeline 101 to the test sample through the first connector 15, connect the second pipeline 102 to the experimental bench through the second connector 16, and finally seal the first pipeline 101 and the second pipeline 102 through the third connector 17. In this way, the test pipeline is installed.

[0076] Throughout this specification, references to "some embodiments," "other embodiments," and the like indicate that the specific features, structures, materials, or characteristics described in connection with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0077] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention and are not intended to limit the embodiments of the present invention. A person skilled in the art would be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. The standard test pipeline for sample heat exchange performance test is characterized by: include: A test pipe (1) is connected between the experimental bench and the test sample, and the test pipe (1) has a flow channel (11) for the test medium to pass through; A pressure test piece (2) is mounted on the test pipe (1) and is used to detect the pressure of the test medium. Along the axial direction of the test pipe (1), the distance between the pressure test piece (2) and the test sample is 3-10 times the diameter of the test pipe (1); A temperature test piece (3) is used to detect the temperature of the test medium. The test pipe (1) is provided with a mounting hole for mounting the temperature test piece (3). The test pipe (1) is in the shape of a straight pipe, and the axis of the mounting hole is perpendicular to the pipe axis of the test pipe (1); or the test pipe (1) is in the shape of a curved pipe, and the axis of the mounting hole is parallel to the pipe axis of the test pipe (1).

2. The standard test pipeline for heat exchange performance test of a sample according to claim 1, characterized in that: A plurality of first flow holes (12) are evenly arranged on the test tube (1) along the circumferential direction of the test tube (1); The pressure test piece (2) comprises a pressure ring (21), a pressure joint (22) and a pressure sensor. The pressure ring (21) is sleeved on the test pipe (1). An overflow gap (20) is provided between the pressure ring (21) and the test pipe (1). An overflow opening (211) is provided on the pressure ring (21). The overflow opening (211) is communicated with the overflow gap (20). The two ends of the pressure joint (22) are respectively connected to the pressure ring (21) and the pressure sensor. A sensing channel (221) for communicating the pressure sensor and the overflow opening (211) is provided in the pressure joint (22). The pressure sensor can detect the pressure of the test medium through the sensing channel (221).

3. The standard test pipeline for heat exchange performance test of a sample according to claim 2, characterized in that: Four first flow holes (12) are provided.

4. The standard test pipeline for heat exchange performance test of a sample according to claim 1, characterized in that: The temperature test piece (3) comprises a fixing frame (31), a temperature sensor sealing joint (32) and a temperature sensor. The fixing frame (31) and the temperature sensor sealing joint (32) are both arranged on the test pipe (1), and the fixing frame (31) is used to fix the wiring harness of the temperature sensor, and the temperature sensor sealing joint (32) is used to install the temperature sensor.

5. The standard test pipeline for heat exchange performance test of a sample according to claim 4, characterized in that: The temperature test piece (3) comprises two temperature sensor sealing joints (32) and two temperature sensors, and the two temperature sensor sealing joints (32) are arranged corresponding to the two temperature sensors; The test pipe (1) is in the shape of a straight pipe, and along a direction perpendicular to the pipe axis of the test pipe (1), the two temperature sensor sealing joints (32) are symmetrically arranged on both sides of the test pipe (1); Alternatively, the test tube (1) is in the shape of a curved tube and includes a curved portion (13) and a straight portion (14), a straight portion (14) is provided at each end of the curved portion (13), the straight portion (14) close to the test sample is connected to the pressure test piece (2), one of the temperature sensor sealing joints (32) is provided at the intersection of the curved portion (13) and one of the straight portions (14), and one of the temperature sensor sealing joints (32) is parallel to the axis of the curved portion (13), and another temperature sensor sealing joint (32) is provided on the curved portion (13), and the other temperature sensor sealing joint (32) is parallel to the axis of the other straight portion (14).

6. The standard test pipeline for heat exchange performance test of a sample according to claim 1, characterized in that: The test pipe (1) further comprises: a first connecting member (15), the first connecting member (15) being arranged on one end of the test tube (1) close to the test sample and used for sealingly connecting the test tube (1) and the test sample; a second connecting piece (16), the second connecting piece (16) being arranged on one end of the test tube (1) close to the experimental bench and used for sealingly connecting the test tube (1) and the experimental bench; The first connecting piece (15) is a flange or a pipe joint; and / or the second connecting piece (16) is a flange or a pipe joint.

7. The standard test pipeline for heat exchange performance test of a sample according to claim 6, characterized in that: The test pipe (1) comprises a first pipe (101) and a second pipe (102) connected in series, wherein the first pipe (101) is closer to the test sample than the second pipe (102), the pipe diameter of the first pipe (101) is equal to the pipe diameter on the test sample, and the pipe diameter of the first pipe (101) is different from the pipe diameter of the second pipe (102), the first pipe (101) is in the shape of a straight pipe, and the second pipe (102) is in the shape of a straight pipe or a curved pipe, the first pipe (101) is provided with the first connecting piece (15) and the pressure test piece (2), and the second pipe (102) is provided with the second connecting piece (16) and the temperature test piece (3).

8. The standard test pipeline for heat exchange performance test of a sample according to claim 7, characterized in that: The test pipe fitting (1) further comprises a third connecting piece (17), wherein each of the first pipeline (101) and the second pipeline (102) is provided with a third connecting piece (17), and the third connecting piece (17) is used for sealingly connecting the first pipeline (101) and the second pipeline (102); the two third connecting pieces (17) are flanges or pipe joints.

9. The standard test pipeline for heat exchange performance test of a sample according to claim 7, characterized in that: A second flow hole is provided on the first pipeline (101); The pressure test piece (2) comprises a pressure joint (22) and a pressure sensor, wherein the pressure joint (22) is connected to the second flow hole, and the pressure sensor is installed on the pressure joint (22) and is used to detect the pressure of the test medium.

10. The standard test pipeline for heat exchange performance test of a sample according to claim 7, characterized in that: The temperature testing piece (3) comprises a temperature sensor sealing joint (32) and a temperature sensor; The second pipeline (102) is in the shape of a curved tube and comprises a bending portion (1021) and a collimating portion (1022); the two ends of the bending portion (1021) are respectively connected to one of the collimating portions (1022); the collimating portion (1022) close to the test sample is connected to the pressure test piece (2); and the temperature sensor sealing joint (32) is provided at the junction of the bending portion (1021) and one of the collimating portions (1022).

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