CN116818225A - Heat transfer tube detection device and method - Google Patents
Heat transfer tube detection device and method Download PDFInfo
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- CN116818225A CN116818225A CN202311101052.3A CN202311101052A CN116818225A CN 116818225 A CN116818225 A CN 116818225A CN 202311101052 A CN202311101052 A CN 202311101052A CN 116818225 A CN116818225 A CN 116818225A
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- 238000001514 detection method Methods 0.000 title claims abstract description 39
- 238000012546 transfer Methods 0.000 title claims abstract description 37
- 238000000034 method Methods 0.000 title claims abstract description 17
- 238000012360 testing method Methods 0.000 claims abstract description 213
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 70
- 238000005086 pumping Methods 0.000 claims abstract description 9
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 40
- 229910052757 nitrogen Inorganic materials 0.000 claims description 20
- 239000007789 gas Substances 0.000 claims description 14
- 230000000149 penetrating effect Effects 0.000 claims description 12
- 238000007789 sealing Methods 0.000 claims description 10
- 238000007689 inspection Methods 0.000 claims description 7
- 238000000605 extraction Methods 0.000 claims description 4
- 239000007788 liquid Substances 0.000 claims description 4
- 238000002347 injection Methods 0.000 claims description 3
- 239000007924 injection Substances 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 6
- 238000010998 test method Methods 0.000 abstract 1
- 238000001704 evaporation Methods 0.000 description 5
- 230000008020 evaporation Effects 0.000 description 5
- 239000003507 refrigerant Substances 0.000 description 5
- 230000008901 benefit Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000004378 air conditioning Methods 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 239000000498 cooling water Substances 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 238000005057 refrigeration Methods 0.000 description 2
- PXGOKWXKJXAPGV-UHFFFAOYSA-N Fluorine Chemical compound FF PXGOKWXKJXAPGV-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000033764 rhythmic process Effects 0.000 description 1
- 238000012956 testing procedure Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
- G01M3/28—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds
- G01M3/2807—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds for pipes
- G01M3/2815—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds for pipes using pressure measurements
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Abstract
The invention provides a heat transfer tube detection device and a method, which aim to shorten the test period of a heat transfer tube, set two sets of evaporators and condensers, and connect the two sets of evaporators and condensers through a set of cold water tank, a hot water tank, a non-condensable gas pumping device and a vacuum pump, and when the test tubes in a first set of evaporators and condensers are detected, the second set of evaporators and condensers can perform operations such as vacuumizing, tube replacement and the like; or when the test tubes in the second set of evaporator and the condenser are detected, the second set of evaporator and the condenser can be subjected to vacuumizing, tube replacement and other operations, so that the equipment utilization rate of the detection device is greatly improved; the test efficiency of a set of detection device approaching to two sets of detection devices in the prior art is realized, the overall test procedure and the time for replacing the test tube are designed, so that the detection efficiency of the heat transfer tube is improved, and the production and operation cost of the detection device is reduced.
Description
Technical Field
The invention relates to the technical field of heat transfer tubes, in particular to a heat transfer tube detection device and a heat transfer tube detection method.
Background
For the heat exchange tube manufacturing industry, the energy efficiency of refrigeration air conditioning equipment is improved, and the energy efficiency is mainly achieved by developing a high-efficiency heat transfer tube to improve the heat exchange efficiency of a heat exchanger. The high-efficiency heat transfer tube used in refrigeration and air-conditioning systems has the advantages that the refrigerant is outside the tube or boiled or condensed, and the heat resistance of convection heat exchange between the inside and the outside of the tube is large when the refrigerant is subjected to phase change, so that the design and development of the heat transfer tube for accurately and rapidly testing the performance of the heat transfer tube and separating the heat resistance between the inside and the outside of the tube are particularly important.
For the high-efficiency heat transfer tube, the indexes mainly measuring the performance of the high-efficiency heat transfer tube are the heat exchange coefficient outside the tube, the heat exchange coefficient inside the tube, the pressure drop inside the tube and the like. Accurate measurement of each performance index is particularly important for design development. For example, the patent in China, filed by 21 months in 2020, issued with publication number CN211527813U, discloses a device for testing water pressure of heat exchange tube, which is mainly characterized by simple structure, convenient disassembly and assembly, good sealing effect, and applicability to pressure drop test of heat exchange tubes with different diameters and different lengths. For example, in the chinese patent of 14 days of 6 months of 2011, the publication number of grant CN202101956U discloses a single tube heat exchange tube testing device, a heat exchange tube, a housing, a transfer pump, a liquid storage tank, and inlet and outlet valves, which are mainly used for solving the test applicability, and can test various heat exchange tubes or heat exchangers, and has the advantages of larger measurable range, strong flexibility, and the following disadvantages: when tested, chilled water and cooling water at constant temperatures cannot be provided; in the test process, the stability is poor, and the test precision is low; the test takes a long time. For example, in the chinese patent filed on 2013, 11 and 25, the publication number CN103645207a discloses a heat exchange tube performance test device, a cold source loop, a cooling water loop, etc., and meanwhile, the heat exchange tube performance test device can test a hot water tank and a cold water tank, and has higher test precision, better stability and smaller test error.
The problems of high test precision, stability and the like of the high-efficiency heat transfer tube are partially solved in the prior art. The experimental device is obviously more suitable for a laboratory or a research institution, and in engineering inspection application, because the production and manufacture of the heat transfer tube need a tracking test with higher density, the test frequency must keep up with the production rhythm, so the experimental device is obviously overlong in the time spent in test, the test structure is too complex, and the inspection frequency requirement of an engineering site is obviously difficult to meet. Therefore, the high-efficiency heat transfer tube rapid inspection device with short test period meets engineering requirements while ensuring test precision and stability.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a heat transfer tube detection device and a method, and aims to shorten the test period of a heat transfer tube.
The heat transfer tube detection device comprises a first evaporator, a first condenser, a second evaporator and a second condenser which are of hollow structures, wherein the hollow structures are used for accommodating test tubes, fixing seats are fixedly and hermetically arranged on two end ports of the first evaporator, the first condenser, the second evaporator and the second condenser, temperature sensors for detecting the internal temperature and pressure sensors for detecting the internal pressure of the first evaporator and the first condenser are arranged on the first evaporator and the first condenser, the interior of the first evaporator is communicated with the interior of the first condenser through pipelines, and two through holes are formed in the side wall of the first evaporator and are respectively externally connected with a noncondensable gas pumping device and a vacuum pump; a first test tube is arranged in the first evaporator in a penetrating way and is concentrically arranged, and two ends of the first test tube respectively penetrate out of the fixing seats at two ends of the first evaporator and are arranged in a sealing way with the corresponding fixing seats; a second test tube is arranged in the first condenser in a penetrating way and is concentrically arranged, and two ends of the second test tube respectively penetrate out of the fixing seats at two ends of the first condenser and are arranged in a sealing way with the corresponding fixing seats; the ports at the two ends of the first test tube are communicated with the inlet and the outlet of the hot water tank respectively through pipelines, and a second water pump and a second flow meter are arranged between the first test tube and the inlet and the outlet of the hot water tank respectively; the two end ports of the second test tube are respectively communicated with the inlet and the outlet of the cold water tank through pipelines, and a first water pump and a first flow meter are respectively arranged between the second test tube and the inlet and the outlet of the cold water tank;
the second evaporator has the same structure as the first evaporator, a third test tube is arranged in the second evaporator in a penetrating way and is concentrically arranged in the second evaporator, two ends of the third test tube respectively penetrate out of the fixing seats at two ends of the second evaporator and are arranged in a sealing way with the corresponding fixing seats, and two end ports of the third test tube are respectively communicated with two end ports of the first test tube; the second condenser has the same structure as the first condenser, a fourth test tube is arranged in the second condenser in a penetrating way and is concentrically arranged in the second condenser, and two end ports of the fourth test tube are respectively communicated with two end ports of the second test tube;
the inside of the second evaporator is communicated with the inside of the second condenser through a pipeline, two through holes arranged on the side wall of the second evaporator are respectively communicated with two through holes arranged on the side wall of the first evaporator through a pipeline, and switching valves are arranged between the non-condensable gas extraction device and the corresponding through holes and between the vacuum pump and the corresponding through holes; temperature sensors are arranged at the two end ports of the first test tube, the second test tube, the third test tube and the fourth test tube, and pressure difference sensors are arranged between the two end ports; the side walls of the first evaporator, the first condenser, the second evaporator and the second condenser are respectively provided with an air injection port for injecting nitrogen and freon.
When changing the test tube, for the break-make of the control pipeline of being convenient for, further do: and switching valves are arranged on the pipelines between the test pipe and the water pump.
The method further comprises the following steps: the first evaporator and the second evaporator are connected to one pressure sensor after passing through the switch valve, and the first condenser and the second condenser are connected to the other pressure sensor after passing through the switch valve.
Based on the heat transfer tube detection device, the heat transfer tube detection method comprises the following steps:
step 1: respectively loading a first test tube and a second test tube into a first evaporator and a first condenser;
step 2: filling nitrogen into the first evaporator and the first condenser, maintaining pressure and detecting leakage, and simultaneously filling a third test tube and a fourth test tube into the second evaporator and the second condenser respectively;
step 3: vacuumizing the first evaporator and the first condenser, simultaneously filling nitrogen into the second evaporator and the second condenser, and performing pressure maintaining and leakage detection;
step 4: charging freon into the first evaporator and the first condenser;
step 5: testing a first test tube and a second test tube, collecting corresponding data, vacuumizing a second evaporator and a second condenser, and then filling freon into the second evaporator and the second condenser;
step 6: testing a third test tube and a fourth test tube, collecting corresponding data, recovering freon in the first evaporator and the first condenser, replacing the first test tube and the second test tube, and filling nitrogen into the first evaporator and the first condenser for pressure maintaining and leakage detection;
step 7: recovering freon in the second evaporator and the second condenser, and vacuumizing the first evaporator and the first condenser;
step 8: charging freon into the first evaporator and the first condenser;
step 9: testing the newly replaced first test tube and the newly replaced second test tube and collecting corresponding data; replacing the third test tube and the fourth test tube, filling nitrogen into the second evaporator and the second condenser for pressure maintaining and leakage detection, and vacuumizing the second evaporator and the second condenser;
step 10: recovering the Freon in the first evaporator and the first condenser, and filling the Freon in the second evaporator and the second condenser;
step 11: testing a newly replaced third test tube and a newly replaced fourth test tube and collecting corresponding data;
step 12: and recovering the freon in the second evaporator and the second condenser.
The method further comprises the following steps: when the pressure is maintained and leakage detection is carried out, the pressure of nitrogen is 1Mpa, and when the pressure drop exceeds 1Kpa, the leakage state is determined.
The method further comprises the following steps: the flow rate of the liquid in the test tube is 0.1-m/s to 5m/s.
The method further comprises the following steps: the diameters of the first test tube, the second test tube, the third test tube and the fourth test tube are 9.52 mm-32 mm, and the lengths of the first test tube, the second test tube, the third test tube and the fourth test tube are 0.2 m-4 m.
The invention has the beneficial effects that: two sets of evaporators and condensers are arranged, and are connected with the two sets of evaporators and condensers through a set of cold water tank, a heater, a vacuum pump and a non-condensable gas extraction device, and the comprehensive testing procedure and the time for replacing test tubes are designed, so that the detection efficiency of the heat transfer tubes is improved, and the production and operation cost of the detection device is reduced.
Drawings
Fig. 1 is a block diagram of a heat transfer tube detection apparatus.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings. Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the invention. The terms left, middle, right, upper, lower, etc. in the embodiments of the present invention are merely relative concepts or references to the normal use state of the product, and should not be construed as limiting.
The heat transfer tube detection device comprises a first evaporator E1, a first condenser C1, a second evaporator E2 and a second condenser C2 which are of hollow structures, wherein the hollow structures are used for accommodating test tubes, fixed seats are fixedly and hermetically arranged on two end ports of the first evaporator E1, the first condenser C1, the second evaporator E2 and the second condenser C2, temperature sensors for detecting the internal temperature and pressure sensors for detecting the internal pressure of the first evaporator E1 are arranged on the first evaporator E1 and the first condenser C1, the interior of the first evaporator E1 is communicated with the interior of the first condenser C1 through pipelines, two through holes are formed in the side wall of the first evaporator E1 and are respectively externally connected with a non-condensable gas pumping device 5 and a vacuum pump 6, and the non-condensable gas pumping device 5 is used for pumping other gases except freon, so that the purity of freon gases in the evaporator and the condenser is improved, and the detection precision is improved; a first test tube is arranged in the first evaporator E1 in a penetrating way and is concentrically arranged, and two ends of the first test tube respectively penetrate out of the fixing seats at two ends of the first evaporator E1 and are arranged in a sealing way with the corresponding fixing seats; a second test tube is arranged in the first condenser C1 in a penetrating way and is concentrically arranged, and two ends of the second test tube respectively penetrate out of the fixing seats at two ends of the first condenser C1 and are arranged in a sealing way with the corresponding fixing seats; the two end ports of the first test tube are communicated with the inlet and outlet of the hot water tank 2 respectively through the pipelines, and a second water pump M2 and a second flow meter Q2 are arranged between the first test tube and the inlet and outlet of the hot water tank 2 respectively; the two end ports of the second test tube are respectively communicated with the inlet and the outlet of the cold water tank 1 through pipelines, and a first water pump M1 and a first flow meter Q1 are respectively arranged between the second test tube and the inlet and the outlet of the cold water tank 1;
the second evaporator E2 has the same structure as the first evaporator E1, a third test tube is arranged in the second evaporator E2 in a penetrating way and is concentrically arranged, two ends of the third test tube respectively penetrate out of the fixing seats at two ends of the second evaporator E2 and are arranged in a sealing way with the corresponding fixing seats, and two end ports of the third test tube are respectively communicated with two end ports of the first test tube; the second condenser C2 has the same structure as the first condenser C1, a fourth test tube is arranged in the second condenser C2 in a penetrating way and is concentrically arranged, and two end ports of the fourth test tube are respectively communicated with two end ports of the second test tube;
the inside of the second evaporator E2 is communicated with the inside of the second condenser C2 through a pipeline, two through holes arranged on the side wall of the second evaporator E2 are respectively communicated with two through holes arranged on the side wall of the first evaporator E1 through a pipeline, and switch valves are arranged between the non-condensable gas pumping device 5 and the corresponding through holes and between the vacuum pump 6 and the corresponding through holes; temperature sensors are arranged at the two end ports of the first test tube, the second test tube, the third test tube and the fourth test tube, and pressure difference sensors are arranged between the two end ports; the side walls of the first evaporator E1, the first condenser C1, the second evaporator E2 and the second condenser C2 are respectively provided with gas injection ports for injecting nitrogen and freon.
When the test tube is replaced, the on-off valve is arranged on the pipeline between the test tube and the water pump in order to control the on-off of the pipeline conveniently. The first evaporator E1 and the second evaporator E2 are connected to the second pressure sensor P2 after passing through the switch valve, and the first condenser C1 and the second condenser C2 are connected to the first pressure sensor P1 after passing through the switch valve. The diameters of the first test tube, the second test tube, the third test tube and the fourth test tube are 9.52 mm-32 mm, and the lengths of the first test tube, the second test tube, the third test tube and the fourth test tube are 0.2 m-4 m.
Based on the heat transfer tube detection device, the heat transfer tube detection method comprises the following steps:
step 1: loading a first test tube and a second test tube into the first evaporator E1 and the first condenser C1 respectively;
step 2: filling nitrogen into the first evaporator E1 and the first condenser C1, maintaining pressure and detecting leakage, and simultaneously filling a third test tube and a fourth test tube into the second evaporator E2 and the second condenser C2 respectively; nitrogen may equally be replaced by other inert gases;
step 3: vacuumizing the first evaporator E1 and the first condenser C1, simultaneously filling nitrogen into the second evaporator E2 and the second condenser C2, and performing pressure maintaining and leakage detection;
step 4: charging freon into the first evaporator E1 and the first condenser C1;
step 5: testing the first test tube and the second test tube and collecting corresponding data, vacuumizing the second evaporator E2 and the second condenser C2, and then filling freon into the second evaporator E2 and the second condenser C2;
step 6: testing a third test tube and a fourth test tube, collecting corresponding data, recovering freon in the first evaporator E1 and the first condenser C1, replacing the first test tube and the second test tube, and filling nitrogen into the first evaporator E1 and the first condenser C1 for pressure maintaining and leakage detecting;
step 7: recovering freon in the second evaporator E2 and the second condenser C2 while evacuating the first evaporator E1 and the first condenser C1;
step 8: charging freon into the first evaporator E1 and the first condenser C1;
step 9: testing the newly replaced first test tube and the newly replaced second test tube and collecting corresponding data; replacing the third test tube and the fourth test tube, filling nitrogen into the second evaporator E2 and the second condenser C2 for pressure maintaining and leakage detection, and vacuumizing the second evaporator E2 and the second condenser C2;
step 10: recovering the freon in the first evaporator E1 and the first condenser C1, and charging the freon in the second evaporator E2 and the second condenser C2;
step 11: testing a newly replaced third test tube and a newly replaced fourth test tube and collecting corresponding data;
step 12: and recovering the freon in the second evaporator E2 and the second condenser C2.
Wherein the thin lines shown in fig. 1 are used to illustrate water lines and the thick lines are used to illustrate freon lines. First, the cold water circulation loop is implemented according to the following procedures: the cold water tank 1 obtains cold water through the cooling device 3, a temperature sensor T3 is arranged on the cold water tank 1 to monitor the water temperature of the cold water tank 1, and the power of the cooling device 3 is controlled through the feedback of the temperature sensor T3 to obtain stable water temperature; closing a switch valve connected with a cold water control system at a test station of the first condenser C1, enabling cold water to provide stable cold water for a test tube in the second condenser C2 through a water pump M1, and arranging a temperature sensor and a pressure difference sensor at two ends of the test tube to record water temperature and pressure difference; the first temperature sensor T1 is inserted into a first blind pipe T1 arranged on the outer wall of the second condenser C2 ” The temperature of the second condenser C2 is recorded, and is fed back to the cold water control system through the first temperature sensor T1 to adjust the temperature of the cold water tank 1 according to the test working condition, and in addition, a third blind pipe T1 for plugging the first temperature sensor T1 is arranged on the outer wall of the first condenser C1 ‘ The method comprises the steps of carrying out a first treatment on the surface of the The second condenser C2 is further provided with a pressure test station, and is connected with a set of pressure sensors P1 through pipelines to record the pressure of the second condenser C2, the saturation temperature of the second condenser C2 corresponds to the pressure in the second condenser C2, and whether the current second condenser C2 reaches a stable saturation state is judged according to the temperature value of the first temperature sensor T1; after leaving the second condenser C2, the cold water flows back to the cold water tank 1 through a return line, on which a first flow meter Q1 is provided to record the flow rate of the water.
The hot water circulation loop is implemented according to the following procedures: the hot water tank 2 obtains hot water through the heating device 4, and a temperature sensor T4 is arranged on the hot water tank 2 to monitor the water temperature of the hot water tank 2 and is communicated withThe power of the heating device 4 is controlled by the feedback of the temperature sensor T4 to obtain stable water temperature, a valve connected with a hot water system at a test station of the first evaporator E1 is closed, the hot water supplies stable hot water to a test tube in the second evaporator E2 through a water pump M2, and a temperature sensor and a differential pressure sensor are arranged at two ends of the test tube to record the water temperature and the pressure difference; the second temperature sensor T2 is inserted into a second blind pipe T2 arranged on the outer wall of the second evaporator E2 ” The temperature of the second evaporator E2 is recorded, and a fourth blind pipe T2 for inserting a second temperature sensor T2 is arranged on the outer wall of the first evaporator E1 ’ The method comprises the steps of carrying out a first treatment on the surface of the The second evaporator E2 is also provided with a pressure test station and is connected with a set of pressure sensors P2 through pipelines so as to record the pressure of the second evaporator E2; the hot water after leaving the second evaporator E2 flows back to the hot water tank 2 through a return line on which a second flow meter Q2 is provided to record the flow of water. When the cold and hot water circulation in the test tube is tested, the flow rate of the liquid in the test tube is 0.1-m/s to 5m/s.
During this time, the freon cycle is implemented as follows: it is necessary to insert the first temperature sensor T1 into the first blind pipe T1 ” The second temperature sensor T2 is inserted into the second blind pipe T2 ” Closing the switch valves of the pressure sensor P1 and the pressure sensor P2 above the first condenser C1 and the first evaporator E1, enabling the pressure sensor P1 and the pressure sensor P2 to be communicated with the second condenser C2 and the second evaporator E2, and closing the separated discharge non-condensable gas pumping device 5 and the vacuum pump 6 connected with the first evaporator E1; test tubes are respectively arranged on the test stations of the second condenser C2 and the second evaporator E2; then, filling nitrogen with the pressure of 1Mpa into the freon circulation loop for pressure maintaining for 2 hours, and if the pressure sensor P1 and the pressure sensor P2 are found to have obvious pressure drop exceeding 1Kpa, detecting the freon circulation loop; nitrogen is discharged for vacuumizing until the absolute pressure is lower than 2Kpa, and the change of the pressure sensor P1 and the pressure sensor P2 is observed; charging freon circulation loop with fluorine such as R134 a; closing a water circulation loop valve connected with the testing stations of the first condenser C1 and the first evaporator E1, opening the water circulation loop, and according to the working condition requirementAnd (3) adjusting the water temperature and flow of the water circulation loop to test the heat exchange tube, and recovering the refrigerant after the test is finished.
In addition, the first condenser C1 and the first evaporator E1 and the corresponding test tube, the cold and hot water circulation loop, the freon circulation loop, etc. can be shielded by the switch valve, so that the second condenser C2 and the second evaporator E2 and the corresponding test tube, the cold and hot water circulation loop, the freon circulation loop, etc. can be operated.
Compared with the traditional test system, the invention has the advantage that the test efficiency is obviously improved. Referring to the following experiment, four batches of heat exchange tubes were tested, and 10 operating points were tested for each batch, and the testing steps and the associated times of the conventional test apparatus (hereinafter, simply referred to as "conventional apparatus") and the test apparatus of the present invention (hereinafter, simply referred to as "new apparatus") were as shown in table 1.
TABLE 1
The testing precision of the novel device is ensured mainly by the sensor and the noncondensable gas pumping device, so that the testing precision can be ensured under the condition of improving the testing frequency; in addition, the on-off of corresponding management in the system No. 1 and the system No. 2 is realized through the switch valve.
The test tubes were currently commercially available B16 evaporation tubes (GDHT-B16 evaporation tubes), and the GDHT-B16 evaporation tube dimensional characteristics are set forth in Table 2.
Table 2:
table 3 compares the internal performance parameters of the GDHT-B16 evaporator tubes tested in the new and conventional experimental set-ups. The test flow rate at the inner side of the tube is constant at 1.8 m/h, and the average temperature is 10.5 ℃ and two experimental devices are used for test and comparison, and the experimental error of the new device and the traditional device is within 2%.
Table 3:
table 4 compares the external performance parameters of the GDHT-B16 evaporation tube tested by the new device with those of the conventional device, the total length of the evaporation tube, namely the heat transfer tube, is 3m, the effective fin section is 2.5m, the water flow rate in the tube is kept at 1.8 m/h, the heat flow density outside the tube is kept at 30 Kw/square meter, the test comparison is carried out by using two experimental devices under the condition of the saturation temperature of the refrigerant at 6 ℃, and the experimental error of the new device and the conventional device is about 1%.
Table 4:
to sum up:
compared with the prior art, the invention has the technical effects that: 1. when the system 1 is detected, the system 2 can perform operations such as vacuumizing and tube replacement simultaneously, or when the system 2 is detected, the system 1 can perform operations such as vacuumizing and tube replacement simultaneously, so that the equipment utilization rate of the detection device is greatly improved; the test efficiency of one set of detection device approaching to two sets of detection devices in the prior art is realized; 2. according to the invention, the two freon circulation loops are matched with one cold and hot water circulation loop, so that the detection effect is improved, and the cost is lower than that of the prior art adopting two detection devices; 3. the two freon circulation loops share one set of pressure testing device, refrigerant air extracting device, vacuumizing device and the like, so that the cost is saved; 4. the testing precision of the detection device is mainly ensured by the testing precision of the sensor and the non-condensable gas extraction device, so that the testing precision can be ensured under the condition of improving the testing frequency of the detection device.
The foregoing has shown and described the basic principles, principal features and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present invention, and various changes and modifications may be made without departing from the spirit and scope of the invention, which is defined in the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (7)
1. A heat transfer tube inspection device, characterized by: the device comprises a first evaporator, a first condenser, a second evaporator and a second condenser which are of hollow structures, wherein the hollow structures are used for accommodating test tubes, fixing seats are fixedly and hermetically arranged on two end ports of the first evaporator, the first condenser, the second evaporator and the second condenser, temperature sensors for detecting the internal temperature and pressure sensors for detecting the internal pressure of the first evaporator and the first condenser are arranged on the first evaporator and the first condenser, the interior of the first evaporator is communicated with the interior of the first condenser through pipelines, and two through holes are formed in the side wall of the first evaporator and are respectively externally connected with a noncondensable gas pumping device and a vacuum pump; a first test tube is arranged in the first evaporator in a penetrating way and is concentrically arranged, and two ends of the first test tube respectively penetrate out of the fixing seats at two ends of the first evaporator and are arranged in a sealing way with the corresponding fixing seats; a second test tube is arranged in the first condenser in a penetrating way and is concentrically arranged, and two ends of the second test tube respectively penetrate out of the fixing seats at two ends of the first condenser and are arranged in a sealing way with the corresponding fixing seats; the ports at the two ends of the first test tube are communicated with the inlet and the outlet of the hot water tank respectively through pipelines, and a second water pump and a second flow meter are arranged between the first test tube and the inlet and the outlet of the hot water tank respectively; the two end ports of the second test tube are respectively communicated with the inlet and the outlet of the cold water tank through pipelines, and a first water pump and a first flow meter are respectively arranged between the second test tube and the inlet and the outlet of the cold water tank;
a third test tube is arranged in the second evaporator in a penetrating way and concentrically arranged, two ends of the third test tube respectively penetrate out of the fixing seats at two ends of the second evaporator and are arranged in a sealing way with the corresponding fixing seats, and two end ports of the third test tube are respectively communicated with two end ports of the first test tube; a fourth test tube is arranged in the second condenser in a penetrating way and is concentrically arranged, and two end ports of the fourth test tube are respectively communicated with two end ports of the second test tube;
the inside of the second evaporator is communicated with the inside of the second condenser through a pipeline, two through holes arranged on the side wall of the second evaporator are respectively communicated with two through holes arranged on the side wall of the first evaporator through a pipeline, and switching valves are arranged between the non-condensable gas extraction device and the corresponding through holes and between the vacuum pump and the corresponding through holes; temperature sensors are arranged at the two end ports of the first test tube, the second test tube, the third test tube and the fourth test tube, and pressure difference sensors are arranged between the two end ports; the side walls of the first evaporator, the first condenser, the second evaporator and the second condenser are respectively provided with an air injection port for injecting nitrogen and freon.
2. The heat transfer tube inspection device according to claim 1, wherein: and switching valves are arranged on the pipelines between the test pipe and the water pump.
3. The heat transfer tube inspection device according to claim 1, wherein: the first evaporator and the second evaporator are connected to one pressure sensor after passing through the switch valve, and the first condenser and the second condenser are connected to the other pressure sensor after passing through the switch valve.
4. A heat transfer tube detection method is characterized in that: the heat transfer tube inspection apparatus according to claim 1, the method comprising the steps of:
step 1: respectively loading a first test tube and a second test tube into a first evaporator and a first condenser;
step 2: filling nitrogen into the first evaporator and the first condenser, maintaining pressure and detecting leakage, and simultaneously filling a third test tube and a fourth test tube into the second evaporator and the second condenser respectively;
step 3: vacuumizing the first evaporator and the first condenser, simultaneously filling nitrogen into the second evaporator and the second condenser, and performing pressure maintaining and leakage detection;
step 4: charging freon into the first evaporator and the first condenser;
step 5: testing a first test tube and a second test tube, collecting corresponding data, vacuumizing a second evaporator and a second condenser, and then filling freon into the second evaporator and the second condenser;
step 6: testing a third test tube and a fourth test tube, collecting corresponding data, recovering freon in the first evaporator and the first condenser, replacing the first test tube and the second test tube, and filling nitrogen into the first evaporator and the first condenser for pressure maintaining and leakage detection;
step 7: recovering freon in the second evaporator and the second condenser, and vacuumizing the first evaporator and the first condenser;
step 8: charging freon into the first evaporator and the first condenser;
step 9: testing the newly replaced first test tube and the newly replaced second test tube and collecting corresponding data; replacing the third test tube and the fourth test tube, filling nitrogen into the second evaporator and the second condenser for pressure maintaining and leakage detection, and vacuumizing the second evaporator and the second condenser;
step 10: recovering the Freon in the first evaporator and the first condenser, and filling the Freon in the second evaporator and the second condenser;
step 11: testing a newly replaced third test tube and a newly replaced fourth test tube and collecting corresponding data;
step 12: and recovering the freon in the second evaporator and the second condenser.
5. The method for detecting a heat transfer tube according to claim 4, wherein: when the pressure is maintained and leakage detection is carried out, the pressure of nitrogen is 1Mpa, and when the pressure drop exceeds 1Kpa, the leakage state is determined.
6. The method for detecting a heat transfer tube according to claim 4, wherein: the flow rate of the liquid in the test tube is 0.1-m/s to 5m/s.
7. The method for detecting a heat transfer tube according to claim 4, wherein: the diameters of the first test tube, the second test tube, the third test tube and the fourth test tube are 9.52 mm-32 mm, and the lengths of the first test tube, the second test tube, the third test tube and the fourth test tube are 0.2 m-4 m.
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