CN108872046A - Hose water permeability experimental rig and test method - Google Patents
Hose water permeability experimental rig and test method Download PDFInfo
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- CN108872046A CN108872046A CN201811066114.0A CN201811066114A CN108872046A CN 108872046 A CN108872046 A CN 108872046A CN 201811066114 A CN201811066114 A CN 201811066114A CN 108872046 A CN108872046 A CN 108872046A
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- vacuum tube
- water permeability
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 37
- 230000035699 permeability Effects 0.000 title claims abstract description 32
- 238000010998 test method Methods 0.000 title abstract description 6
- 238000012360 testing method Methods 0.000 claims abstract description 55
- 238000001035 drying Methods 0.000 claims abstract description 35
- 238000000034 method Methods 0.000 claims abstract description 23
- 238000007789 sealing Methods 0.000 claims description 19
- 230000008014 freezing Effects 0.000 claims description 12
- 238000007710 freezing Methods 0.000 claims description 12
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 9
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 5
- 229910052802 copper Inorganic materials 0.000 claims description 5
- 239000010949 copper Substances 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 5
- 238000001514 detection method Methods 0.000 claims description 4
- 238000006243 chemical reaction Methods 0.000 claims description 2
- 238000009434 installation Methods 0.000 claims description 2
- 238000011041 water permeability test Methods 0.000 claims description 2
- 238000013461 design Methods 0.000 abstract description 4
- 230000035515 penetration Effects 0.000 description 5
- 239000004677 Nylon Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 229920001778 nylon Polymers 0.000 description 4
- 239000000203 mixture Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000004744 fabric Substances 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000012790 confirmation Methods 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
- G01N15/0806—Details, e.g. sample holders, mounting samples for testing
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
- G01N15/082—Investigating permeability by forcing a fluid through a sample
- G01N15/0826—Investigating permeability by forcing a fluid through a sample and measuring fluid flow rate, i.e. permeation rate or pressure change
Landscapes
- Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- Biochemistry (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Analytical Chemistry (AREA)
- Dispersion Chemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Fluid Mechanics (AREA)
- Drying Of Solid Materials (AREA)
Abstract
A kind of hose water permeability experimental rig, including experimental box, are placed with test sample in case, and test sample is located at closed at one end in case, and the other end is connected to vacuum tube, and the vacuum tube other end is connected to after being pierced by experimental box with the U-shaped drying tube in cryogenic thermostat component；Test method：The 5th valve is closed, the first, second and third valve is opened, opens vacuum pump；Setting value is dropped to vacuum degree, closes third valve, check device leakproofness reseals if reducing；Third valve is opened, third valve is closed after allowing the vacuum degree of vacuum pump to drop to setting value, checks and opens cryogenic thermostat reactive bath technique after leakproofness, leakproofness confirm well, temperature is -70 DEG C；Chamber is opened, the temperature inside the box, humidity are recorded after a period；The first and third valve is closed, fourth, fifth valve is opened；Fourth, fifth valve is closed, U-shaped drying tube is taken out and weighs record；Above-mentioned steps are recycled, until numerical stability.Structure of the invention is ingenious in design, it is ensured that tests safe, reliable and effective completion.
Description
Technical field
The present invention relates to a kind of tube body detection technique field, a kind of hose water permeability experimental rig and examination are in particulard relate to
Proved recipe method is mainly used for the test to air-conditioner pipe, nylon tube interior moisture content, water penetration.
Background technique
The experimental projects such as interior moisture content, water penetration are the stress test project of air-conditioner pipe, nylon tube investigation, this class testing
Requirement of the project to equipment, personnel is very high.To have to equipment：Equilibrium temperature（50℃±2℃）And humidity（85%±5%RH）Perseverance
Steady temperature damp test case, equilibrium temperature（-70℃±2℃）Cold bath, guarantee 100% sealing, 100% cleaning and dry test
System（Testboard bay）Deng；Careful, patient, working specification and precisely is required to tester；Any of the above link is not up to
To requirement, test error can be all caused.Import test equipment is bought in conditional laboratory, but expensive；Common laboratory
It does not satisfy the requirements and cannot achieve this class testing.
Therefore, how to design a kind of can solve the hose water permeability experimental rig of above-mentioned technical problem and test method is
The project that the present inventor concentrates on studies.
Summary of the invention
The object of the present invention is to provide a kind of hose water permeability experimental rig and test method, smart structural design,
It can guarantee that hose water penetration tests safe, reliable and effective completion.
In order to realize that above scheme, the present invention provide a kind of hose water permeability experimental rig, including for storing
Test sample simultaneously provides the experimental box of detection temperature, humidity for test sample, is placed at least one test in the experimental box
Sample, the test sample are located at one end in experimental box for closing setting, the other end of the test sample and the first vacuum
The other end sealing of pipe connection, first vacuum tube is pierced by the U after experimental box and for collecting the vapor in test sample
The connection of shape drying tube one end, the U-shaped drying tube are placed in cryogenic thermostat component.
Inventive hose water permeability experimental rig, wherein the other end of the U-shaped drying tube is connected to the second vacuum tube,
The other end of second vacuum tube is connected to distributor, and one end of the distributor is connected to vacuum pump, the distributor
The other end is connected to dehumidifying device.
Inventive hose water permeability experimental rig, wherein being equipped with first pressure gauge and first on first vacuum tube
Valve is equipped with second pressure gauge and the second valve on second vacuum tube.
Inventive hose water permeability experimental rig, wherein third valve is installed between the distributor and vacuum pump,
4th valve is installed, the other end of the dehumidifying device is connected with third vacuum between the distributor and dehumidifying device
It manages, the 5th valve is installed on the third vacuum tube.
Inventive hose water permeability experimental rig, wherein first vacuum tube, the second vacuum tube and third vacuum tube
It is made of red copper material.
Inventive hose water permeability experimental rig, wherein first vacuum tube, the second vacuum tube are true by two
Blank pipe is connected by three-way connection and is formed, and the first pressure gauge, second pressure gauge are mounted to corresponding three-way connection the
On three ends.
Inventive hose water permeability experimental rig, wherein the cryogenic thermostat component includes for mentioning for U-shaped drying tube
For placing the cryogenic thermostat reactive bath technique of environment, the upper end of the cryogenic thermostat reactive bath technique is equipped with cryogenic freezing slot, the low temperature cold
Freeze and place alcohol in slot, the U-shaped drying tube is placed in the alcohol of the cryogenic freezing slot, the upper end of the cryogenic freezing slot
Sealing cover is installed, the both ends of the U-shaped drying tube are sealedly connected with rubber tube respectively, and the other end of two rubber tubes is worn
It crosses after the sealing cover and is connect respectively with the first vacuum tube, the second vacuum tube.
Inventive hose water permeability experimental rig, wherein the two sides of the cryogenic thermostat reactive bath technique are respectively equipped with temperature
Sealing cover, at least one first vacuum tube, the temperature of at least one second vacuum tube difference hermetically passing two sides are close
It is connected after capping with the corresponding rubber tube.
Inventive hose water permeability experimental rig is provided with described in two of them close between rubber tube and the sealing cover
Seal.
A kind of hose water permeability test method comprising following steps：
（1）The 5th valve is closed, the first valve, the second valve and third valve are opened, opens vacuum pump；In device to be tested
After vacuum degree is reduced to setting value and stablizes, third valve is closed, is kept for 15 seconds, the leakproofness of quick checkout facility device, i.e.,
Check first pressure gauge, second pressure gauge reading whether reduce, if reduce reseal；
（2）Third valve is opened, allows vacuum pump operation and after vacuum degree drops to setting value, third valve is closed, keeps 30s, then
The leakproofness of secondary checkout facility device is opened cryogenic thermostat reactive bath technique, is made low after the vacuum leakproofness of experimental rig has confirmed
The temperature of warm isothermal reaction bath remains -70 DEG C；
（3）Chamber is sealed, the temperature inside the box is made to be set as 50 DEG C, humidity set 85%RH, chamber is opened, works as test
The temperature inside the box, humidity are recorded after a cycle；
（4）The first valve and third valve are closed, the 4th valve is opened, then slowly opens the 5th valve；
（5）It is again switched off the 4th valve and the 5th valve, U-shaped drying tube is taken out from cryogenic thermostat reactive bath technique, weighs and records；
（6）Above-mentioned steps are recycled, until numerical stability.
After adopting the above scheme, inventive hose water permeability experimental rig passes through by the constant temperature for storing test sample
The composition such as constant moisture test case, cryogenic thermostat component and vacuum pump, solves the interior moisture contents such as air-conditioner pipe, nylon tube, water penetration
The technical problem of test can simultaneously test 3 samples by three tunnels of distributor point, be realized in high temperature and humidity ring
Test sample is stored under border, the technical problem that U-shaped drying tube places environment in low temperature is efficiently solved, so that entirely testing
Journey is easy to operate, safe and reliable, testing efficiency is high, it is ensured that data are true.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of inventive hose water permeability experimental rig；
Fig. 2 is the structural schematic diagram of the cryogenic thermostat component of inventive hose water permeability experimental rig；
Fig. 3 is the temperature seal lid structural schematic diagram of inventive hose water permeability experimental rig.
Specific embodiment
The structural schematic diagram of inventive hose water permeability experimental rig as shown in Figure 1, including for storing test sample
1 and the experimental box 2 of detection temperature and humidity is provided for test sample 1, set temperature is 50 DEG C, humidity 85%, when use
Chamber 2 is allowed to stablize at least 4h under temperature 50 C ± 2 DEG C and 85% ± 5%RH of humidity；The inner cavity of experimental box 2 is placed at least one
A test sample 1, the present embodiment place three test samples 1.Each test sample 1 is located at one end of 2 inner cavity of experimental box for closing
The other end of setting, test sample 1 is connected to by pipe fitting with the first vacuum tube 3, and the first vacuum tube 3 is by red copper material system
At.First vacuum tube 3 the other end sealing be pierced by experimental box 2 after connect with one end of rubber tube 4, the other end of rubber tube 4 and
For collecting one end connection of the U-shaped drying tube 5 of the vapor of 1 inner cavity of test sample, U-shaped drying tube 5 is placed in cryogenic thermostat
In component, U-shaped drying tube 5 is for collecting the vapor penetrated into test sample 1 and condensing out it sufficiently.U-shaped is dry
Before dry pipe 5 is installed, the inner and outer surfaces of U-shaped drying tube 5 are first cleaned with compressed air or nitrogen and suitable solvent, are put after drying
Enter in 80 DEG C of high-temperature cabinets and keeps 1.5h；After taking-up is cooled to room temperature, the cloth that can not afford hair wipes its surface, is weighed and records number
According to；Then the both ends of U-shaped drying tube 5 are connect with rubber tube 4 respectively, and immersed in cryogenic thermostat component.Each test loop
Terminate, take out U-shaped drying tube 5 and all nozzles are sealed immediately, is transferred in drier at room temperature；The cloth that can not afford hair is wiped
The outer surface of U-shaped drying tube 5 is wiped, after removing sealing, weighs in the balance immediately and records data.
The other end of U-shaped drying tube 5 is connect with another rubber tube 4, the other end of another rubber tube 4 and the second vacuum tube 6
Connection, the second vacuum tube 6 are made of red copper material.The other end of second vacuum tube 6 is connected to distributor 7, and distributor 7 is handle
Three tunnel sample tests combine, the vacuum degree needed for keeping for each road sample test.One end of distributor 7 and vacuum pump 8
Connection, vacuum pump 8 are that guarantee system keeps in test required vacuum degree；The other end and dehumidifying device 9 of distributor 7 connect
Logical, dehumidifying device 9 is to guarantee that each cyclic test terminates into the air of U-shaped drying tube 5 to be dry.
First pressure gauge 10 and the first ball valve 11 are installed on first vacuum tube 3, second pressure is installed on the second vacuum tube 6
Power table 12 and the second ball valve 13.First vacuum tube 3 is made up of two vacuum tubes the connection of the first three-way connection 14, the first pressure
Power table 10 is installed on the third end of the first three-way connection 14.Second vacuum tube 6 is also to be connected by two vacuum tubes by the two or three
First 15 connection composition, second pressure gauge 12 are installed on the third end of the second three-way connection 15.
Third ball valve 16 is installed between distributor 7 and vacuum pump 8, is equipped between distributor 7 and dehumidifying device 9
Four ball valves 17, the other end of dehumidifying device 9 are connected with third vacuum tube 18, which is by red copper material system
At.5th ball valve 19 is installed, each test loop terminates, and before taking out U-shaped drying tube 5, first opens on third vacuum tube 18
5th ball valve 19, then the 4th ball valve 17 is slowly opened, allow the air of outside to enter in U-shaped drying tube 5 through dehumidifying device 9,
Vacuum in elimination system, it is ensured that inner air tube is dry.
As shown in connection with fig. 2, cryogenic thermostat component includes cryogenic thermostat reactive bath technique 20, and cryogenic thermostat reactive bath technique 20 is dry for U-shaped
Dry pipe 5 provides -70 DEG C ± 2 DEG C of placement environment.The upper end of cryogenic thermostat reactive bath technique 20 is equipped with cryogenic freezing slot 21, cryogenic freezing
Alcohol is placed in slot 21, U-shaped drying tube 5 is soaked in the alcohol of cryogenic freezing slot 21, the upper end installation of cryogenic freezing slot 21
There is sealing cover 22, two rubber tubes 4 of 5 both ends of U-shaped drying tube connection are each passed through sealing cover 22, two rubber tubes 4 and sealing
Sealing ring 23 is provided between lid 22.Absolute alcohol is filled in cryogenic freezing slot 21 when test, U-shaped drying tube 5 is immersed nothing
In water-alcohol, it is fixed on two rubber tubes 4 for connecting U-shaped drying tube 5 on sealing cover 22, sealing cover 22 is covered, to prevent anhydrous
Alcohol volatilization；The power switch for opening cryogenic thermostat reactive bath technique 20, temperature is set to required temperature（-70℃）, open refrigeration.
Refering to what is shown in Fig. 3, the two sides of cryogenic thermostat reactive bath technique 20 are respectively equipped with temperature seal lid 24, temperature seal lid 24
Three card slots 25 are circumferentially with along outer rim, three on temperature seal lid 24 on the right side of three the first vacuum tube 3 difference hermetically passings
It is connected after a card slot 25 with corresponding rubber tube 4, on the temperature seal lid 24 on the left of three the second vacuum tube 6 difference hermetically passings
Three card slots 25 after with corresponding rubber tube 4 connect.
The test method of inventive hose water permeability experimental rig includes the following steps：
（1）After inventive hose water permeability experimental rig is assembled, the 5th ball valve 19 is closed, opens the first ball valve 11, the
Two ball valves 13 and third ball valve 16 open vacuum pump 8；After vacuum degree in device to be tested is reduced to setting value and stablizes, close
Third ball valve 16 is closed, is kept for 15 seconds, the leakproofness of quick checkout facility device, is i.e. inspection first pressure gauge 10, second pressure gauge
Whether 12 reading reduces, if reducing need to reseal, if not reducing, illustrates that the leakproofness of experimental rig is intact；
（2）Third ball valve 16 is opened, allows vacuum pump 8 to run and vacuum degree drops to setting value, close third ball valve 16 later, keep
30s checks again for the leakproofness of experimental rig, and after the vacuum leakproofness confirmation of experimental rig is intact, it is anti-to open cryogenic thermostat
20 should be bathed, the temperature of cryogenic thermostat reactive bath technique 20 is made to remain -70 DEG C；
（3）Chamber 2 is sealed, the temperature in chamber 2 is made to be set as 50 DEG C, humidity set 85%RH, opens chamber
2, when test records the temperature inside the box, humidity after a cycle；
（4）The first ball valve 11 and third ball valve 16 are closed, the 4th ball valve 17 is opened, then slowly opens the 5th ball valve 19；
（5）It is again switched off the 4th ball valve 17 and the 5th ball valve 19, U-shaped drying tube 5 is taken out from cryogenic thermostat reactive bath technique 20, is passed through
Balance is weighed and is recorded.
（6）Above-mentioned steps are recycled, until numerical stability.
Inventive hose water permeability experimental rig by chamber 2 by the constant temperature and humidity for storing test sample 1,
The composition such as cryogenic thermostat component and vacuum pump 8 solves the technology of the interior moisture contents such as air-conditioner pipe, nylon tube, water penetration test
Problem divides three tunnels by distributor 7, can test 3 samples, be realized in 50 DEG C and 85%RH high temperature and humidity simultaneously
Test sample 1 is stored under environment, efficiently solves the technical problem that U-shaped drying tube 5 places environment in -70 DEG C of low temperature, so that
Entire test process is easy to operate, safe and reliable, testing efficiency is high, it is ensured that data are true.
Embodiment described above is only that preferred embodiments of the present invention will be described, not to the scope of the present invention
It is defined, without departing from the spirit of the design of the present invention, this field ordinary engineering and technical personnel is to technology of the invention
The various changes and improvements that scheme is made, should fall within the scope of protection determined by the claims of the present invention.
Claims (10)
1. a kind of hose water permeability experimental rig, which is characterized in that including for storing test sample and being mentioned for test sample
For the experimental box of detection temperature, humidity, at least one test sample is placed in the experimental box, the test sample is located at real
One end in tryoff is closing setting, and the other end of the test sample is connected to the first vacuum tube, first vacuum tube
Other end sealing is connected to after being pierced by experimental box with U-shaped drying tube one end for collecting the vapor in test sample, the U-shaped
Drying tube is placed in cryogenic thermostat component.
2. hose water permeability experimental rig according to claim 1, which is characterized in that the U-shaped drying tube it is another
End is connected to the second vacuum tube, and the other end of second vacuum tube is connected to distributor, one end of the distributor and vacuum
Pump connection, the other end of the distributor are connected to dehumidifying device.
3. hose water permeability experimental rig according to claim 2, which is characterized in that installed on first vacuum tube
There are first pressure gauge and the first valve, second pressure gauge and the second valve are installed on second vacuum tube.
4. hose water permeability experimental rig according to claim 3, which is characterized in that the distributor and vacuum pump it
Between third valve is installed, the 4th valve is installed between the distributor and dehumidifying device, the dehumidifying device it is another
One end is connected with third vacuum tube, is equipped with the 5th valve on the third vacuum tube.
5. hose water permeability experimental rig according to claim 4, which is characterized in that first vacuum tube, second
Vacuum tube and third vacuum tube are made of red copper material.
6. hose water permeability experimental rig according to claim 5, which is characterized in that first vacuum tube, second
Vacuum tube is made up of two vacuum tubes three-way connection connection, and the first pressure gauge, second pressure gauge are installations
In on corresponding three-way connection third end.
7. hose water permeability experimental rig described in one of -6 according to claim 1, which is characterized in that the cryogenic thermostat group
Part includes for providing the cryogenic thermostat reactive bath technique for placing environment for U-shaped drying tube, and the upper end of the cryogenic thermostat reactive bath technique is set
There is cryogenic freezing slot, places alcohol in the cryogenic freezing slot, the U-shaped drying tube is placed in the alcohol of the cryogenic freezing slot
Interior, the upper end of the cryogenic freezing slot is equipped with sealing cover, and the both ends of the U-shaped drying tube are sealedly connected with rubber tube respectively,
The other end of two rubber tubes is connect with the first vacuum tube, the second vacuum tube respectively after passing through the sealing cover.
8. hose water permeability experimental rig according to claim 7, which is characterized in that the cryogenic thermostat reactive bath technique
Two sides are respectively equipped with temperature seal lid, and at least one first vacuum tube, at least one second vacuum tube difference are close
Envelope connects after the temperature seal lid of two sides with the corresponding rubber tube.
9. hose water permeability experimental rig according to claim 7, which is characterized in that two rubber tubes with it is described
Sealing ring is provided between sealing cover.
10. a kind of hose water permeability test method, which is characterized in that include the following steps：
（1）The 5th valve is closed, the first valve, the second valve and third valve are opened, opens vacuum pump；In device to be tested
After vacuum degree is reduced to setting value and stablizes, third valve is closed, is kept for 15 seconds, the leakproofness of quick checkout facility device, i.e.,
Check first pressure gauge, second pressure gauge reading whether reduce, if reduce reseal；
（2）Third valve is opened, allows vacuum pump operation and after vacuum degree drops to setting value, third valve is closed, keeps 30s, then
The leakproofness of secondary checkout facility device is opened cryogenic thermostat reactive bath technique, is made low after the vacuum leakproofness of experimental rig has confirmed
The temperature of warm isothermal reaction bath remains -70 DEG C；
（3）Chamber is sealed, the temperature inside the box is made to be set as 50 DEG C, humidity set 85%RH, chamber is opened, works as test
The temperature inside the box, humidity are recorded after a cycle；
（4）The first valve and third valve are closed, the 4th valve is opened, then slowly opens the 5th valve；
（5）It is again switched off the 4th valve and the 5th valve, U-shaped drying tube is taken out from cryogenic thermostat reactive bath technique, weighs and records；
（6）Above-mentioned steps are recycled, until numerical stability.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811066114.0A CN108872046A (en) | 2018-09-13 | 2018-09-13 | Hose water permeability experimental rig and test method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811066114.0A CN108872046A (en) | 2018-09-13 | 2018-09-13 | Hose water permeability experimental rig and test method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110595703A (en) * | 2019-08-23 | 2019-12-20 | 合肥荣事达太阳能科技有限公司 | Device and method for detecting sealing performance of vacuum tube of solar water heater |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110595703A (en) * | 2019-08-23 | 2019-12-20 | 合肥荣事达太阳能科技有限公司 | Device and method for detecting sealing performance of vacuum tube of solar water heater |
| CN110595703B (en) * | 2019-08-23 | 2024-03-26 | 合肥荣事达太阳能科技有限公司 | Device and method for detecting tightness of vacuum tube of solar water heater |
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