CN220271106U - Reverse osmosis membrane performance detection device - Google Patents
Reverse osmosis membrane performance detection device Download PDFInfo
- Publication number
- CN220271106U CN220271106U CN202321280993.3U CN202321280993U CN220271106U CN 220271106 U CN220271106 U CN 220271106U CN 202321280993 U CN202321280993 U CN 202321280993U CN 220271106 U CN220271106 U CN 220271106U
- Authority
- CN
- China
- Prior art keywords
- cylinder body
- clamping ring
- reverse osmosis
- osmosis membrane
- clamping
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 239000012528 membrane Substances 0.000 title claims abstract description 77
- 238000001223 reverse osmosis Methods 0.000 title claims abstract description 76
- 238000001514 detection method Methods 0.000 title claims abstract description 17
- 238000010438 heat treatment Methods 0.000 claims abstract description 11
- 230000000149 penetrating effect Effects 0.000 claims abstract description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 35
- 238000007789 sealing Methods 0.000 claims description 17
- 238000009423 ventilation Methods 0.000 abstract description 2
- 230000035699 permeability Effects 0.000 description 6
- 230000008859 change Effects 0.000 description 5
- 238000001914 filtration Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000003204 osmotic effect Effects 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 208000011231 Crohn disease Diseases 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000084 colloidal system Substances 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005374 membrane filtration Methods 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 230000009897 systematic effect Effects 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/124—Water desalination
- Y02A20/131—Reverse-osmosis
Abstract
The utility model belongs to the technical field of reverse osmosis membrane testing devices, in particular to a reverse osmosis membrane performance testing device, which comprises a first cylinder body and a second cylinder body, wherein the second cylinder body is arranged above the first cylinder body, a heating plate is arranged around the outer wall of the second cylinder body, a temperature sensor and a pressure sensor are respectively arranged on the outer side of the second cylinder body in a penetrating manner, a first clamping ring and a second clamping ring can be clamped between the first cylinder body and the second cylinder body, the first clamping ring is stacked below the second clamping ring, a reverse osmosis membrane can be clamped between the first clamping ring and the second clamping ring, the second cylinder body is heated through the heating plate, the temperature and the pressure of the second cylinder body are changed in a ventilation and pressurization manner through a pneumatic tube, so that the reverse osmosis membrane can be conveniently tested under different pressures and different use environments of the reverse osmosis membrane can be simulated for detection.
Description
Technical Field
The utility model relates to the technical field of reverse osmosis membrane testing devices, in particular to a reverse osmosis membrane performance detection device.
Background
The reverse osmosis membrane is an artificial semipermeable membrane with certain characteristics and is made by simulating a biological semipermeable membrane, and is a core component of a reverse osmosis technology, and the principle of the reverse osmosis technology is that under the action of higher osmotic pressure than a solution, substances and water are separated according to the fact that other substances cannot permeate the semipermeable membrane, and the membrane pore diameter of the reverse osmosis membrane is very small, so that dissolved salts, colloid, microorganisms, organic matters and the like in water can be effectively removed.
The prior art publication No. CN215311501U provides a reverse osmosis membrane performance detection device, and the device includes bottom plate, lower hydro-cylinder, lower drum, connecting plate, air duct, electric control valve, upper drum, arc observation window, upper hydro-cylinder, signal cable, roof, pressure sensor, sealing washer, dome, check valve and ring channel. The utility model has the advantages of rational in infrastructure, through placing down drum nozzle department and operation with reverse osmosis membrane go up the hydro-cylinder and be in the extension state, can be with last drum nozzle and down drum nozzle through the mutual inseparable seal of sealing ring paste and press together, reach and arrange reverse osmosis membrane detection area in the effect in the sealed space, through aerify in to lower drum through external pneumatic control equipment and air duct and close the gas charging channel through electric control valve, reach the effect of applying the atmospheric pressure to reverse osmosis membrane, realize carrying out the function of performance detection to reverse osmosis membrane, and be convenient for acquire reverse osmosis membrane pressure bearing range data.
Although the device has more beneficial effects, the following problems still exist: the device is inconvenient for the permeability of the reverse osmosis membrane under different pressures and temperatures, so that systematic testing of the performance of the reverse osmosis membrane is inconvenient. In view of this, we propose a reverse osmosis membrane performance detection device.
Disclosure of Invention
In order to overcome the defects of the prior art and solve the problem that the permeability of a reverse osmosis membrane is inconvenient to detect under different pressures and temperatures, the utility model provides a reverse osmosis membrane performance detection device.
The technical scheme adopted for solving the technical problems is as follows: the reverse osmosis membrane performance detection device comprises a first cylinder body and a second cylinder body, wherein the second cylinder body is arranged above the first cylinder body, a heating plate is arranged around the outer wall of the second cylinder body, a temperature sensor and a pressure sensor are respectively arranged on the outer side of the second cylinder body in a penetrating mode, a first clamping ring and a second clamping ring can be arranged between the first cylinder body and the second cylinder body in a clamping mode, the first clamping ring is stacked below the second clamping ring, a reverse osmosis membrane can be arranged between the first clamping ring and the second clamping ring in a clamping mode, the second cylinder body is heated through the heating plate, the temperature and the pressure of the second cylinder body are changed through a ventilation and pressurization mode of a pneumatic tube, accordingly, the detection of the permeability of the reverse osmosis membrane under different pressures and temperatures can be conveniently carried out, and different use environments of the reverse osmosis membrane can be simulated to carry out detection.
Preferably, the support frame is evenly installed in the outside of first cylinder body, just the top of first cylinder body is seted up flutedly, and is provided with first sealing washer in the recess to the below of first clamping ring is boss structure, just the boss joint of first clamping ring can be in the recess of first cylinder body, can strengthen the sealing ability after first clamping ring card goes into in the first cylinder body with first sealing washer.
Preferably, the lower extreme of first cylinder body is connected with the drain pipe, just be provided with the flowmeter on the drain pipe, can obtain the water yield that produces through reverse osmosis membrane filtration in the unit time through the flowmeter to can audio-visual obtain reverse osmosis membrane's water yield under different pressure and temperature, and then can judge reverse osmosis membrane's performance.
Preferably, the outer side of the second cylinder body is provided with a plurality of groups of oil hydraulic cylinders in a lower end, the lower end face of the second cylinder body is provided with a groove, a second sealing ring is arranged in the groove, the upper end of the second clamping ring is of a boss structure, the boss of the second clamping ring can be clamped into the groove of the second cylinder body, and the tightness of the second clamping ring clamped into the groove of the second cylinder body can be enhanced by the second sealing ring.
Preferably, the top of second cylinder body is connected with the inlet tube, just install the water intaking valve on the inlet tube, the top of second cylinder body is connected with the pneumatic tube, just the pneumatic tube sets up the side of inlet tube, the other end of pneumatic tube is connected on the air pump, just install the control valve on the pneumatic tube, utilize the pneumatic tube can change the atmospheric pressure in the second cylinder body to be convenient for measure the osmotic power of reverse osmosis membrane under different pressure environment.
Preferably, the upper end face of the first clamping ring is provided with a first clamping pad, the lower end face of the second clamping ring is provided with a second clamping pad, on one hand, the tightness of the contact between the first clamping ring and the second clamping ring can be increased by utilizing the first clamping pad and the second clamping pad, on the other hand, the reverse osmosis membrane can be contacted with the second clamping ring, the friction between the reverse osmosis membrane and the reverse osmosis membrane is increased, and the reverse osmosis membrane is prevented from falling off when the reverse osmosis membrane is clamped.
The utility model has the advantages that:
1. according to the utility model, the heating plate is used for heating the second cylinder body, and the air pressure pipe is used for ventilating and pressurizing the second cylinder body to change the temperature and the pressure of the second cylinder body, so that the permeability of the reverse osmosis membrane at different pressures and temperatures can be conveniently detected, different use environments of the reverse osmosis membrane can be simulated for detection, the use performance of the reverse osmosis membrane in different environments can be obtained, and the detection capability of the reverse osmosis membrane is improved.
2. The utility model can obtain the water quantity generated by the filtration of the reverse osmosis membrane in unit time through the flowmeter, thereby intuitively obtaining the water yield of the reverse osmosis membrane under different pressures and temperatures and further judging the service performance of the reverse osmosis membrane.
Drawings
In order to more clearly illustrate the embodiments of the utility model or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the utility model, and that other drawings can be obtained from these drawings without inventive faculty for a person skilled in the art.
FIG. 1 is a schematic overall structure of a first embodiment;
FIG. 2 is a schematic view of an isometric semi-sectioned structure of a first embodiment;
FIG. 3 is a schematic view showing a semi-sectional enlarged structure of a first clamping ring and a second clamping ring in accordance with the first embodiment;
fig. 4 is an exploded enlarged schematic view of the first clamping ring and the second clamping ring of the first embodiment.
In the figure: 1. a first cylinder; 2. a second cylinder; 3. a heating plate; 4. a temperature sensor; 5. a pressure sensor; 6. a first clamping ring; 7. a second clamping ring; 8. a reverse osmosis membrane; 101. a support frame; 102. a drain pipe; 103. a flow meter; 104. a first seal ring; 201. a water inlet pipe; 202. a water inlet valve; 203. an air pressure pipe; 204. a control valve; 205. an oil hydraulic cylinder; 206. a second seal ring; 601. a first clamping pad; 701. and a second clamping pad.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
Example 1
Referring to fig. 1-4, a reverse osmosis membrane performance detection device includes a first cylinder 1 and a second cylinder 2, the second cylinder 2 is disposed above the first cylinder 1, a heating plate 3 is disposed around an outer wall of the second cylinder 2, a temperature sensor 4 and a pressure sensor 5 are disposed on an outer side of the second cylinder 2 in a penetrating manner, a first clamping ring 6 and a second clamping ring 7 can be disposed between the first cylinder 1 and the second cylinder 2 in a clamping manner, the first clamping ring 6 is disposed below the second clamping ring 7 in a stacking manner, a reverse osmosis membrane 8 can be disposed between the first clamping ring 6 and the second clamping ring 7 in a clamping manner, the second cylinder 2 is heated by the heating plate 3, and the second cylinder 2 is ventilated and pressurized by an air pressure pipe 203, so that the reverse osmosis membrane 8 can be conveniently detected in different pressures and temperatures, and different use environments of the reverse osmosis membrane 8 can be simulated for detection;
during operation, firstly, the reverse osmosis membrane 8 is paved on one side end face of the first clamping ring 6 with the first clamping pad 601, then the second clamping ring 7 is stacked on the first clamping ring 6, the reverse osmosis membrane 8 is pre-clamped by the first clamping ring 6 and the second clamping ring 7, then the first clamping ring 6 is clamped into a groove formed in the top end of the first cylinder body 1, the oil hydraulic cylinder 205 stretches out downwards to drive the second cylinder body 2 to move downwards, the second cylinder body 2 is pressed on the second clamping ring 7 and is sealed with the first cylinder body 1 to generate a closed space, when the pressure and the temperature in the second cylinder body 2 are changed, the pressure change of the device can be more accurately detected by the pressure sensor 5 with the model JC-2000-D-FB, and the pressure change of the device can be measured by the temperature sensor 4 with the model WRET-01.
The support frame 101 is uniformly arranged on the outer side of the first cylinder body 1, a groove is formed in the top end of the first cylinder body 1, a first sealing ring 104 is arranged in the groove, a boss structure is arranged below the first clamping ring 6, a boss of the first clamping ring 6 can be clamped into the groove of the first cylinder body 1, and sealing capacity after the first clamping ring 6 is clamped into the first cylinder body 1 can be enhanced by the aid of the first sealing ring 104;
when the reverse osmosis membrane sealing device works, after the reverse osmosis membrane 8 is pre-clamped by the first clamping ring 6 and the second clamping ring 7, the boss part of the first clamping ring 6 can be clamped into the groove at the upper end of the first cylinder body 1, and a gap between the first cylinder body 1 and the first clamping ring 6 is filled and sealed by the first sealing ring 104.
The lower end of the first cylinder body 1 is connected with a drain pipe 102, and the drain pipe 102 is provided with a flowmeter 103, and the water yield generated by filtering the reverse osmosis membrane 8 in unit time can be obtained through the flowmeter 103, so that the water yield of the reverse osmosis membrane 8 under different pressures and temperatures can be intuitively obtained, and the service performance of the reverse osmosis membrane 8 can be further judged;
when the device works, water permeated by the reverse osmosis membrane 8 enters the first cylinder body 1 and is discharged by the drain pipe 102, and when water flows through the drain pipe 102, the flow of the water in the drain pipe 102 can be measured by the flowmeter 103 with the brand of Crohn's model number FD-R80 to obtain the generated water quantity.
A plurality of groups of oil pressure cylinders 205 are uniformly arranged at the lower end of the outer side of the second cylinder body 2, a groove is formed in the lower end face of the second cylinder body 2, a second sealing ring 206 is arranged in the groove, the upper end of the second clamping ring 7 is of a boss structure, a boss of the second clamping ring 7 can be clamped into the groove of the second cylinder body 2, and the tightness of the second clamping ring 7 clamped into the groove of the second cylinder body 2 can be enhanced by the second sealing ring 206;
when the device is in operation, after the first clamping ring 6 is stacked on the first cylinder body 1, the oil pressure cylinder 205 extends downwards to drive the second cylinder body 2 to move downwards, so that the second cylinder body 2 presses the second clamping ring 7, a boss of the second clamping ring 7 is clamped into a groove of the second cylinder body 2, and the second clamping ring is sealed by the second sealing ring 206, so that the device forms a sealed whole.
The top end of the second cylinder body 2 is connected with a water inlet pipe 201, a water inlet valve 202 is arranged on the water inlet pipe 201, the top end of the second cylinder body 2 is connected with an air pressure pipe 203, the air pressure pipe 203 is arranged beside the water inlet pipe 201, the other end of the air pressure pipe 203 is connected to an air pump, a control valve 204 is arranged on the air pressure pipe 203, and the air pressure in the second cylinder body 2 can be changed by utilizing the air pressure pipe 203, so that the permeability of the reverse osmosis membrane 8 under different pressure environments can be conveniently measured;
then, the water inlet valve 202 on the water inlet pipe 201 can be opened to fill water into the second cylinder body 2 by using the water inlet pipe 201, and as the pressure in the second cylinder body 2 is greater than that of the first cylinder body 1, water in the second cylinder body 2 can pass through the reverse osmosis membrane 8 to enter the first cylinder body 1, so that water filtration is realized, and when filtration and permeation are carried out, the pressure or the temperature in the second cylinder body 2 can be independently changed, so that the influence of different temperatures or pressures on the permeability of the reverse osmosis membrane 8 can be judged.
The up end of first clamping ring 6 is provided with first clamping pad 601, and the lower terminal surface of second clamping ring 7 is provided with second clamping pad 701, utilizes first clamping pad 601 and second clamping pad 701 on the one hand can increase the leakproofness that first clamping ring 6 contacted with second clamping ring 7, and the other party alright contact with reverse osmosis membrane 8, increases the friction with reverse osmosis membrane 8, prevents reverse osmosis membrane 8 and drops when being pressed from both sides tightly.
In the working principle, when the performance of the reverse osmosis membrane 8 is detected, firstly, the reverse osmosis membrane 8 is paved on one side end face of a first clamping ring 6 with a first clamping pad 601, then a second clamping ring 7 is piled on the first clamping ring 6, the reverse osmosis membrane 8 is pre-clamped by the first clamping ring 6 and the second clamping ring 7, then the first clamping ring 6 is clamped into a groove formed in the top end of a first cylinder body 1, and the oil pressure cylinder 205 stretches downwards to drive the second cylinder body 2 to move downwards, so that the second cylinder body 2 is pressed on the second clamping ring 7 and sealed with the first cylinder body 1 mutually to generate a closed space, then, the water inlet valve 202 on the water inlet pipe 201 can be opened to fill water into the second cylinder body 2 by using the water inlet pipe 201, and as the pressure in the second cylinder body 2 is larger than that of the first cylinder body 1, water in the second cylinder body 2 can pass through the reverse osmosis membrane 8 to enter the first cylinder body 1 so as to filter the water, and when the water is filtered and permeated, the air control valve 204 can be opened, air can be pumped into the second cylinder body 2 through the air pressure pipe 203 so as to change the pressure of the second cylinder body 2, and the temperature of the second cylinder body 2 can be changed by opening the heating plate 3, so that the permeation capacity of the reverse osmosis membrane 8 under different temperatures or pressures can be obtained according to the water flow detected by the flowmeter 103 on the water drain pipe 102, and further the performance of the reverse osmosis membrane 8 can be detected.
In the description of the present specification, the descriptions of the terms "one embodiment," "example," "specific example," and the like, mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present utility model. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The foregoing has shown and described the basic principles, principal features and advantages of the utility model. It will be understood by those skilled in the art that the present utility model is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present utility model, and various changes and modifications may be made without departing from the spirit and scope of the utility model, which is defined in the appended claims.
Claims (6)
1. The reverse osmosis membrane performance detection device comprises a first cylinder body (1) and a second cylinder body (2), wherein the second cylinder body (2) is arranged above the first cylinder body (1), and is characterized in that a heating plate (3) is arranged on the outer wall of the second cylinder body (2) in a surrounding mode, a temperature sensor (4) and a pressure sensor (5) are respectively arranged on the outer side of the second cylinder body (2) in a penetrating mode, a first clamping ring (6) and a second clamping ring (7) can be clamped between the first cylinder body (1) and the second cylinder body (2), the first clamping ring (6) is stacked below the second clamping ring (7), and a reverse osmosis membrane (8) can be clamped between the first clamping ring (6) and the second clamping ring (7).
2. The reverse osmosis membrane performance testing device according to claim 1, wherein: the support frame (101) is evenly installed in the outside of first cylinder body (1), just the top of first cylinder body (1) is seted up flutedly, and is provided with first sealing washer (104) in the recess to the below of first clamping ring (6) is boss structure, just but the boss joint of first clamping ring (6) in the recess of first cylinder body (1).
3. The reverse osmosis membrane performance testing device according to claim 1, wherein: the lower end of the first cylinder body (1) is connected with a drain pipe (102), and a flowmeter (103) is arranged on the drain pipe (102).
4. The reverse osmosis membrane performance testing device according to claim 1, wherein: the outer side of second cylinder body (2) is close the lower extreme and is evenly installed multiunit oil pressure jar (205), just the lower terminal surface of second cylinder body (2) is seted up flutedly, and is provided with second sealing washer (206) in the recess, the upper end of second clamping ring (7) is boss structure, just the boss of second clamping ring (7) can block into in the recess of second cylinder body (2).
5. The reverse osmosis membrane performance testing device according to claim 1, wherein: the top of second jar body (2) is connected with inlet tube (201), just install water intaking valve (202) on inlet tube (201), the top of second jar body (2) is connected with pneumatic tube (203), just pneumatic tube (203) set up the side of inlet tube (201), the other end of pneumatic tube (203) is connected on the air pump, just install control valve (204) on pneumatic tube (203).
6. The reverse osmosis membrane performance testing device according to claim 1, wherein: the upper end face of the first clamping ring (6) is provided with a first clamping pad (601), and the lower end face of the second clamping ring (7) is provided with a second clamping pad (701).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321280993.3U CN220271106U (en) | 2023-05-24 | 2023-05-24 | Reverse osmosis membrane performance detection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321280993.3U CN220271106U (en) | 2023-05-24 | 2023-05-24 | Reverse osmosis membrane performance detection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220271106U true CN220271106U (en) | 2023-12-29 |
Family
ID=89301137
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321280993.3U Active CN220271106U (en) | 2023-05-24 | 2023-05-24 | Reverse osmosis membrane performance detection device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220271106U (en) |
-
2023
- 2023-05-24 CN CN202321280993.3U patent/CN220271106U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN100585357C (en) | Voltage-regulating transformer valve body detection device | |
| CN201531594U (en) | Constant stress seal gasket capable of detecting leakage | |
| CN204255812U (en) | The device for testing permeability coefficient of original state coarse-grained soil | |
| CN204387697U (en) | Pipeline gas leak detecting device | |
| CN109115665A (en) | A kind of more storehouse saturation testing devices | |
| CN112179543A (en) | Device for measuring stress change of soil body after grouting | |
| CN220271106U (en) | Reverse osmosis membrane performance detection device | |
| CN201196597Y (en) | Detection apparatus for pressure regulator valve body | |
| CN214251422U (en) | Air tightness detection device | |
| CN206754669U (en) | A kind of natural gas line sample cock | |
| CN210037399U (en) | Consolidation-infiltration-shear wave velocity coupling experimental device | |
| CN203443748U (en) | Lamp breathable waterproof membrane detecting device | |
| CN201828386U (en) | Double-opposite-peak sealed leakage detector of corrugated pipe sealing ring | |
| CN108692875A (en) | A kind of filter seals detection device easy to operate | |
| CN112683746B (en) | Device and method for measuring effective stress conversion rate of slurry film forming | |
| CN108692874A (en) | Quickly detection filter seals device | |
| CN214174090U (en) | Coal rock anisotropic adsorption expansion and permeability testing device | |
| JP2015517906A (en) | Method for filtering suspension and recessed plate | |
| CN209961426U (en) | Quick measuring device of muffler leakproofness | |
| CN203672572U (en) | Passenger car rear axle gas tightness detection system | |
| CN207263584U (en) | A kind of water proof apparatus for being used to detect waterproof material | |
| CN205280292U (en) | Water pump air -tight test platform | |
| CN218212537U (en) | Device for testing air permeability of membrane | |
| CN201974274U (en) | Horizontal type equipment used for detecting tightness of electric heater | |
| CN218411560U (en) | Efficient sliding valve air tightness test bed |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |