CN214788152U - Pressure difference simulation air volume test bench for fresh air machine - Google Patents
Pressure difference simulation air volume test bench for fresh air machine Download PDFInfo
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- CN214788152U CN214788152U CN202120574453.0U CN202120574453U CN214788152U CN 214788152 U CN214788152 U CN 214788152U CN 202120574453 U CN202120574453 U CN 202120574453U CN 214788152 U CN214788152 U CN 214788152U
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Abstract
The utility model provides a fresh air machine simulation pressure difference air volume test board, which relates to the technical field of air purification and comprises an air conduit, wherein the air conduit is provided with a front end static pressure ring and a rear end static pressure ring, a wind resistance regulating valve is arranged between the front end static pressure ring and the rear end static pressure ring, and the air conduit is provided with an air volume tester which is positioned at one side of the rear end static pressure ring, which is far away from the front end static pressure ring; one end of the ventilation pipeline close to the front end static pressure ring is used for being connected with an air outlet of the fresh air fan, and one end of the ventilation pipeline close to the rear end static pressure ring is used for being connected with an air inlet of the fresh air fan. The utility model discloses a set up the windage governing valve and adjust air volume control windage to set up front end static pressure ring and rear end static pressure ring in windage governing valve both sides and show the windage in real time, can be quick, effectively test the amount of wind, can simulate the filter resistance simultaneously and test simulation pressure differential, it is convenient to test.
Description
Technical Field
The utility model relates to an air purification technical field especially relates to new trend simulation pressure differential air volume testboard.
Background
The fresh air system is an independent air processing system which is composed of a ventilation fan, a pipeline and accessories, wherein the ventilation fan can ventilate and purify air, the ventilation fan filters and purifies outdoor fresh air, the fresh air is conveyed indoors through the pipeline, and meanwhile, the indoor dirty air is discharged outdoors.
The air supply volume and the air exhaust volume of the fresh air system are directly related to indoor air circulation, and the air volume is mainly influenced by the following factors: (1) the air quantity provided by the motor fan; (2) the windage of the purification system; (3) wind resistance of the ventilation duct. From the above factors, the lower the resistance of the purification system and the ventilation duct is, the higher the air volume provided by the fresh air system is. Under normal conditions, the resistance of the ventilation pipeline cannot be changed greatly in the using process; but the windage of clean system increases along with the increase of the dirt of clean system load, and the new fan exhaust volume that new fan can provide will reduce gradually.
The general motor fan has a group of wind pressure-wind volume curve graphs for design reference of designers, the designers carry out product design work according to the wind pressure-wind volume curve graphs of the motor fan, the initial wind resistance and the final wind resistance of a purification system are determined, and meanwhile, a certain wind resistance allowance is reserved for a ventilation pipeline.
The purification system of the fresh air system mainly comprises primary effect, intermediate effect and high-efficiency filter screens, the wind resistance of each filter screen needs to be tested through a standard test air channel, then the filter screens are installed in the fresh air machine to test the air volume of the whole machine, and if the air volume cannot meet the requirement, the filter screens or fans with larger horsepower need to be manufactured again and then matched. In order to achieve ideal air volume, multiple matching is often needed, the research and development period is long, and the research and development cost is high. Meanwhile, in the past, an anemoscope is mostly adopted for testing the wind speed at the wind outlet, and the deviation of the test result is relatively large due to the non-uniform wind speed at the wind outlet. Therefore, it is necessary to develop a testing platform capable of testing the air volume rapidly and effectively, and simulating the resistance of the filter and testing the simulated differential pressure.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a new trend simulation pressure differential air volume testboard, it adjusts air volume control windage through setting up the windage governing valve to set up front end static compression ring and rear end static pressure ring real-time display windage in windage governing valve both sides, can be quick, effectively test the amount of wind, can simulate the filter resistance and test simulation pressure differential simultaneously, it is convenient to test.
The above technical purpose of the present invention can be achieved by the following technical solutions:
a pressure difference air volume simulation test bench for a fresh air ventilator comprises a ventilation pipeline, wherein a front-end static pressure ring and a rear-end static pressure ring are arranged on the ventilation pipeline, an air resistance regulating valve is arranged between the front-end static pressure ring and the rear-end static pressure ring, and an air volume tester which is positioned on one side, far away from the front-end static pressure ring, of the rear-end static pressure ring is arranged on the ventilation pipeline; the one end that air pipe is close to front end static clamping ring is used for being connected with the air outlet of new fan, the one end that air pipe is close to rear end static clamping ring is used for being connected with the air intake of new fan.
By adopting the technical scheme, the new fan generally comprises four air inlets and air outlets, namely the outdoor new air inlet, the indoor new air outlet, the indoor return air inlet and the outdoor return air outlet, so that the new fan simulation pressure difference air volume test board is required to be simultaneously suitable for the four air inlets and the air outlets, one end, close to the front end static pressure ring, of the ventilation pipeline is connected with the air outlet of the new fan, one end, close to the rear end static pressure ring, of the ventilation pipeline is connected with the air inlet of the new fan, and the use requirements are met.
The filter can be arranged in the fresh air machine or not according to the test purpose, wind enters the ventilation pipeline from one end of the ventilation pipeline close to the front end static pressure ring, and the static pressure difference between the front end static pressure ring and the rear end static pressure ring is the adjusted simulated wind resistance; the area of the ventilation opening is adjusted through the wind resistance adjusting valve, so that the wind pressure and the wind volume are adjusted; the air volume tester calculates the air volume. When the wind resistance adjusting valve is used, after the wind resistance of the whole system reaches design parameters by adjusting the wind resistance adjusting valve, the real-time wind volume can be read by the wind volume tester. If a plurality of windage need be tested, only need adjust the windage governing valve and adjust the windage, can simulate filter pressure differential, it is convenient to test, convenient operation.
In the development stage of the new fan, a filter element does not need to be arranged in the new fan sample machine, the pressure-air volume curve of the whole system of the new fan can be tested, design parameters are provided for a designer of the new fan, and the designer can conveniently carry out fan model selection, air duct optimization and other works. In the installation stage of the new fan, the whole set of new fan is tested, the resistance of the air pipe can be simulated and tested, the air resistance under different pressure differences can be tested, and design parameters are provided for the air pipe. Meanwhile, the motor fan can be directly tested, the wind resistance of the motor fan can be drawn quickly by using the miniature different wind resistances.
The utility model provides a new trend simulation pressure differential air volume testboard simulates filter and tuber pipe pressure differential through adjustment windage governing valve, can adjust pressure differential at will as required to read out the amount of wind in real time, simple structure, convenient operation, the range of application is extensive.
Further, an airflow rectifier is arranged between the wind resistance adjusting valve and the rear end static pressure ring, and the wind resistance adjusting valve is arranged on the end face of the airflow rectifier; the airflow rectifier is of an orifice plate structure comprising a plurality of rectifying holes, and the axial directions of the rectifying holes are parallel to the axial direction of the ventilation pipeline.
By adopting the technical scheme, the airflow rectifier is arranged, and the airflow with irregular flow at the front end is changed into the airflow with regular flow by utilizing the plurality of rectifying holes on the airflow rectifier, so that the accuracy of the wind pressure tested by the front-end static pressure ring and the rear-end static pressure ring is ensured, and the accuracy of the test result is ensured.
Further, still be equipped with the warm and humid acidimeter on the air pipe, the warm and humid acidimeter is located the one side that rear end static compression ring was kept away from to the air quality tester.
Through adopting above-mentioned technical scheme, the hygrothermograph is used for monitoring test environment's temperature and humidity, avoids temperature, humidity difference to lead to the change of air viscosity to influence the test result, and the hygrothermograph feeds back test environment's temperature and humidity in real time, and the adjustment test environment of being convenient for guarantees the uniformity of test, its simple structure, and the effect is obvious.
Further, the test temperature of the hygrothermograph is 23 +/-5 ℃ and the relative humidity is 50 +/-20%.
By adopting the technical scheme, the test temperature is limited to 23 +/-5 ℃, the relative humidity is 50 +/-20%, the influence of air viscosity change on the test result caused by different temperature and humidity can be avoided, and the test consistency is ensured.
Furthermore, the air pipe both ends can be dismantled and be connected with the reducing adapter, just the reducing angle of reducing adapter is less than or equal to 15.
Through adopting above-mentioned technical scheme, when new fan business turn over wind gap and air pipe mismatch, can utilize the accurate joint of reducing to realize being connected of air pipe and new fan business turn over wind gap, improve the utility model discloses an application scope. The reducing angle of the reducing adapter is not more than 15 degrees, the influence on wind resistance when the reducing adapter is reduced is avoided, the accuracy of wind pressure measurement by the front-end static pressure ring and the rear-end static pressure ring is guaranteed, and the accuracy of simulated wind resistance is guaranteed.
Further, the front end static pressure ring and the rear end static pressure ring are the same in structure and comprise four static pressure holes which are formed in the side wall of the ventilation pipeline in a circumferential array mode and communicated with the ventilation pipeline, each group of the four static pressure holes is communicated with the ventilation pipeline through a hose, and the hose is connected with a pressure gauge.
Through adopting above-mentioned technical scheme, utilize static pressure hole, hose and manometer to constitute the static clamping ring, realize the test to static pressure, and the static pressure when guaranteeing the test is stable, and then guarantees the accuracy of simulation windage, improves the accuracy of testboard test result, its simple structure, and the effect is obvious.
Furthermore, the static pressure hole on the ventilation pipeline is connected with an air guide pipe which is arranged along the axial direction of the static pressure hole, one end of the air guide pipe, which is far away from the static pressure hole, is provided with a bulb, and the hose is provided with a soft hole matched with the bulb.
Through adopting above-mentioned technical scheme, in the hose on with the bulb stopper on the air duct to the hose, can realize the intercommunication of hose and static pressure hole, conveniently change when the hose damages like this, and the leakproofness of air duct and hose connection can be guaranteed in the cooperation of bulb and soft hole, and then guarantee the accuracy of static pressure test structure.
Further, the diameter of the ventilation pipeline is D, and the distance between the front end static pressure ring and the ventilation pipeline and the end port close to the front end static pressure ring is L1 and L1 is larger than 4D.
Through adopting above-mentioned technical scheme, distance L1 between front end static pressure ring and the ventilation pipe air inlet one end is > 4D, avoids appearing the turbulent flow, leads to the wind pressure of front end static pressure ring test inaccurate, and then leads to the wind resistance of simulation and the amount of wind of test all inaccurate.
Further, the distance between one end of the airflow rectifier close to the air volume tester and the air volume tester is L2, and L2 is larger than 4D.
By adopting the technical scheme, the distance L2 between the airflow rectifier and the air volume tester is larger than 4D, so that the influence of the static pressure difference after the airflow rectifier is rectified on the air pressure measured by the pitot tube in the air volume tester is ensured to be as small as possible, and the accuracy of the air volume measured by the air volume tester is further ensured.
Further, the distance between the air volume tester and the end port close to the air duct is L3, and L3 is more than 4D.
Through adopting above-mentioned technical scheme, distance L3 between air test appearance and the air-out one end of air pipe is > 4D, avoids the influence of air outlet turbulent flow to air test appearance, guarantees the accuracy that air test appearance measured the amount of wind.
To sum up, the utility model discloses following beneficial effect has:
1. by arranging the wind resistance adjusting valve, arranging the front end static pressure ring and the rear end static pressure ring on two sides of the wind resistance adjusting valve, adjusting wind pressure and wind volume by using the wind resistance adjusting valve, simulating the pressure difference of the filter and the wind tube, wherein the pressure difference can be adjusted randomly according to requirements, and simulating the wind resistance and the wind volume in real time, so that the test is convenient;
2. in the new fan development stage, a filter element does not need to be arranged in a new fan sample machine, the pressure-air volume curve of the whole system of the new fan can be tested, design parameters are provided for a new fan designer, and the new fan sample machine is convenient for the designer to carry out fan model selection, air duct optimization and other work;
3. in the installation stage of the new fan, the whole set of new fan is tested, the resistance of the air pipe can be simulated and tested, the air resistance under different pressure differences can be tested, and design parameters are provided for the air pipe;
4. the new fan can also be directly connected with the air outlet of the corresponding motor fan, different wind resistances can be simulated, and the wind resistance curve of the corresponding motor fan can be rapidly drawn.
Drawings
FIG. 1 is a schematic view of the overall structure of a test bench for simulating differential pressure and air volume of a fresh air blower;
FIG. 2 is a schematic view of an installation structure of a pressure difference air volume simulation test bench of a fresh air blower for testing an air outlet of the fresh air blower;
FIG. 3 is a schematic view of an installation structure of a pressure difference air quantity simulation test board of a fresh air blower for testing an air inlet of the fresh air blower;
FIG. 4 is a schematic structural diagram of a front-end static pressure ring and a rear-end static pressure ring in a pressure difference air volume simulation test bench of the fresh air machine;
FIG. 5 is a schematic structural diagram of a wind resistance regulating valve in a test bench for simulating differential pressure and wind volume of a fresh air blower;
fig. 6 is a schematic structural diagram of an airflow rectifier in a test bench for simulating differential pressure and air volume of a fresh air machine.
In the figure, 1, a new fan; 2. a ventilation duct; 21. a reducing adapter; 22. a static pressure port; 23. an air duct; 24. a ball head; 3. a front end static pressure ring; 31. a hose; 32. a soft hole; 33. a pressure gauge; 4. a wind resistance regulating valve; 5. an airflow rectifier; 51. a flow rectifying hole; 6. a rear end static pressure ring; 7. an air volume tester; 8. a thermo-hygrometer.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.
A new trend simulation pressure difference air volume testboard, as shown in figure 1, including pipe form air pipe 2, be equipped with front end static pressure ring 3 and rear end static pressure ring 6 that are used for measuring the wind pressure on air pipe 2, be equipped with the windage governing valve 4 that is used for adjusting wind pressure and amount of wind between front end static pressure ring 3 and rear end static pressure ring 6, be equipped with airflow rectifier 5 in the one side that windage governing valve 4 is close to rear end static pressure ring 6, and windage governing valve 4 sets up on airflow rectifier 5 terminal surface, utilize airflow rectifier 5 to rectify the irregular air current that passes through windage governing valve 4 into regular air current, be convenient for rear end static pressure ring 6 to measure the wind pressure, the static pressure difference between front end static pressure ring 3 and the rear end static pressure ring 6 is simulation windage promptly. Still be equipped with the air volume tester 7 that is located rear end static pressure ring 6 and keeps away from front end static pressure ring 3 one side on air pipe 2, utilize air volume tester 7 to test the amount of wind, combine simulation windage, can test the amount of wind of the new fan under the department simulation windage.
The new fan generally comprises four air inlets and outlets, namely an outdoor new air inlet, an indoor new air outlet, an indoor return air inlet and an outdoor return air outlet, so that the new fan simulation pressure difference air volume test board is required to be simultaneously suitable for the four air inlets and the four air outlets. Therefore, as shown in fig. 2, one end of the ventilation duct 2 close to the front-end static pressure ring 3 is used for being connected with two air outlets of the new fan 1, and as shown in fig. 3, one end of the ventilation duct 2 close to the rear-end static pressure ring 6 is used for being connected with two air inlets of the new fan 1, so that the air volume test under the simulation pressure difference of the four air inlets and the four air outlets of the new fan is realized.
The ventilation pipeline 2 can be a pipeline which is adaptive to the size of the air inlet and the air outlet of the fresh air fan, and the material of the ventilation pipeline is generally a stainless steel pipe. However, in order to improve the universality of the ventilation duct 2, as shown in fig. 1 and fig. 2, the reducing adapters 21 are detachably connected to the two ends of the ventilation duct 2 respectively, and the connection between the ventilation duct 2 and the air inlets and the air outlets of different fresh air fans can be realized by using different reducing adapters 21, so that the application range of the test bench is improved. Wherein, the removable connection of reducing adapter 21 and air pipe 2 can be threaded connection or joint, and in order to reduce the resistance influence when reducing adapter 21, reducing adapter 21's reducing angle alpha must not be greater than 15.
As shown in fig. 2 and fig. 3, the utility model discloses can use in new fan development phase or installation phase, also can be used to motor fan, application scope is extensive. Specifically, a filter is or is not arranged in the fresh air machine according to the test purpose, the air pressure and the air volume are adjusted by adjusting the air resistance adjusting valve 4, the static pressure difference between the front end static pressure ring 3 and the rear end static pressure ring 6 is the simulation pressure difference of the air pipe or the filter, the air volume tester 7 directly reads out the equivalent quantity, the pressure-air volume curve of the fresh air system can be tested, the simulation pressure difference can be adjusted at will through the air resistance adjusting valve 4, the simulation pressure difference is directly obtained according to the front end static pressure ring 3 and the rear end static pressure ring 6, the air volume is directly obtained through the air volume tester 7, and the test is convenient and fast. In the new fan development stage, provide design parameter for new fan designer, make things convenient for the designer to carry out work such as fan lectotype, wind channel optimization, provide design parameter for the tuber pipe in new fan installation phase. Meanwhile, the ventilation pipeline 2 can also be directly connected with the air outlet of the motor fan to simulate different wind resistances and quickly draw the wind resistance curve of the corresponding motor fan.
As shown in fig. 1 and 4, in this embodiment, the front end static pressure ring 3 and the rear end static pressure ring 6 have the same structure, and each of the four static pressure holes 22, which are arranged on the side wall of the ventilation duct 2 in a circumferential array and are communicated with the ventilation duct 2, each static pressure hole 22 is connected with a rigid air duct 23 integrally formed with the ventilation duct 2, one end of each group of four air ducts 23, which is far away from the static pressure holes 22, is communicated with each other through a hose 31, and the hose 31 is connected with a pressure gauge 33 for measuring front end wind pressure and rear end wind pressure. Wherein, the one end that every air duct 23 kept away from static pressure hole 22 is equipped with both ends open-ended bulb 24, and is equipped with the soft hole 32 with bulb 24 complex on the hose 31, utilizes bulb 24 and soft hole 32 to realize the intercommunication between air duct 23 and the hose 31, not only makes things convenient for the installation of hose 31 to change, and the leakproofness is better moreover.
As shown in fig. 5, the air resistance adjusting valve 4 adopts a fan-shaped structure or a shutter-type structure, and the area of the vent can be adjusted, so as to achieve the purpose of adjusting the air pressure and the air volume, and in this embodiment, the fan-shaped structure of the air resistance adjusting valve 4 is selected. In addition, as shown in fig. 6, in the present embodiment, the airflow rectifier 5 has a pore plate structure including a plurality of rectifying holes 51, and the rectifying holes 51 are axially parallel to the ventilation duct 2, so that the airflow flowing irregularly at the front end is flattened and flows regularly. The flow straightener 5 is made of a corrosion resistant material and the edges of the opening should not be burred or rounded and not be visually damaged, especially during handling and cleaning.
As shown in fig. 1, in the present embodiment, the air volume tester 7 may measure the air velocity using an anemometer, calculate the air volume from the diameter of the ventilation duct 2, and automatically display the air volume. The anemometer can be a thermosensitive type, a wind wheel type or a pitot tube type. In addition, in consideration of the variation of air viscosity caused by different temperatures and humidities, so as to cause test result deviation, in order to ensure the test consistency, the ventilation pipeline 2 is also provided with a hygrothermograph 8 which is positioned on one side of the air volume tester 7 far away from the rear end static pressure ring 6, the test temperature of the hygrothermograph 8 is 23 +/-5 ℃, and the relative humidity is 50 +/-20%.
Because the air current all can have the turbulent flow when passing in and out air pipe 2, in order to reduce the influence of turbulent flow to wind pressure, amount of wind test, need design front end static pressure ring 3, airflow rectifier 5, the position of air test appearance 7 and airflow rectifier 5 structure. As shown in fig. 1, the diameter of the ventilation duct 2 is D, the distance between the front-end static pressure ring 3 and the air inlet end port of the ventilation duct 2 is L1, and L1 is greater than 4D, so that the wind pressure of the front-end static pressure ring 3 test is not accurate due to turbulent flow at the front-end static pressure ring 3. The distance between one end of the airflow rectifier 5 close to the air volume tester 7 and the air volume tester 7 is L2, and L2 is more than 4D, so that the influence of the static pressure difference after rectification of the airflow rectifier 5 on the air pressure measured by a pitot tube in the air volume tester 7 is ensured to be as small as possible, and the accuracy of the air volume tester 7 in measuring the air volume is further ensured. The distance between the air quantity tester 7 and the air outlet end port of the ventilation pipeline 2 is L3, and L3 is more than 4D, so that the problem that the air quantity tester 7 measures the air quantity inaccurately due to the influence of the air outlet turbulence on the air quantity tester 7 is avoided.
As shown in fig. 1 and fig. 6, the rectifying holes 51 on the airflow rectifier 5 are square holes, and have a side length of w, and w is 0.075D; the thickness of the pore plate between the adjacent rectifying holes 51 is e, and e is less than or equal to 0.005D; the axial length of the airflow rectifier 5 is L, and L is 0.45D, which ensures that the airflow rectifier 5 can effectively stabilize the airflow.
The utility model discloses a theory of operation and application method:
the utility model discloses can use in new fan development stage or installation phase, also can be used to motor fan, application scope is extensive. According to the test purpose, a filter is or is not arranged in the fresh air machine, and when the air outlet of the fresh air machine 1 is measured, the air outlet of the fresh air machine 1 is connected with one end, close to the front end static pressure ring 3, of the ventilation pipeline 2; when measuring the air inlet of the fresh air machine 1, the air inlet of the fresh air machine 1 is connected with one end of the ventilating duct 2 close to the rear end static pressure ring 6.
The wind pressure and the wind volume are adjusted by adjusting the wind resistance adjusting valve 4, the static pressure difference between the front-end static pressure ring 3 and the rear-end static pressure ring 6 is the simulation pressure difference of the wind pipe or the filter, the wind volume tester 7 directly reads out the equivalent quantity, the pressure-wind volume curve of the fresh wind system can be tested, and the real-time temperature and humidity of the hygrothermograph 8 are recorded. The simulation pressure difference can be adjusted at will through the wind resistance adjusting valve 4, the simulation pressure difference is directly obtained according to the front end static pressure ring 3 and the rear end static pressure ring 6, the air quantity is directly obtained through the air quantity tester 7, and the test is convenient and fast.
In the new fan development stage, provide design parameter for new fan designer, make things convenient for the designer to carry out work such as fan lectotype, wind channel optimization, provide design parameter for the tuber pipe in new fan installation phase. Meanwhile, the ventilation pipeline 2 can also be directly connected with the air outlet of the motor fan to simulate different wind resistances and quickly draw the wind resistance curve of the corresponding motor fan.
While the foregoing description shows and describes the preferred embodiments of the present invention, it is to be understood that the invention is not limited to the forms disclosed herein, but is not intended to be exhaustive or to exclude other embodiments and may be used in various other combinations, modifications, and environments and is capable of changes within the scope of the inventive concept as expressed herein, commensurate with the above teachings, or the skill or knowledge of the relevant art. But that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the invention, which is to be limited only by the claims appended hereto.
Claims (10)
1. The utility model provides a new trend simulation pressure differential air volume testboard which characterized in that: the ventilating duct comprises a ventilating duct (2), wherein a front end static pressure ring (3) and a rear end static pressure ring (6) are arranged on the ventilating duct (2), a wind resistance adjusting valve (4) is arranged between the front end static pressure ring (3) and the rear end static pressure ring (6), and a wind volume tester (7) which is positioned on one side, far away from the front end static pressure ring (3), of the rear end static pressure ring (6) is arranged on the ventilating duct (2); air pipe (2) are close to the one end of front end static clamping ring (3) and are used for being connected with the air outlet of new fan (1), air pipe (2) are close to the one end of rear end static clamping ring (6) and are used for with the air intake connection of new fan (1).
2. The fresh air machine simulation pressure difference air volume test bench of claim 1, characterized in that: an airflow rectifier (5) is arranged between the wind resistance regulating valve (4) and the rear end static pressure ring (6), and the wind resistance regulating valve (4) is arranged on the end face of the airflow rectifier (5); the airflow rectifier (5) is of an orifice plate structure comprising a plurality of rectifying holes (51), and the axial directions of the rectifying holes (51) are parallel to the axial direction of the ventilation pipeline (2).
3. The fresh air machine simulation pressure difference air volume test bench of claim 2, characterized in that: still be equipped with warm and humid acidimeter (8) on air pipe (2), warm and humid acidimeter (8) are located one side that rear end static compression ring (6) were kept away from in wind tester (7).
4. The fresh air machine simulation pressure difference air volume test bench of claim 3, characterized in that: the testing temperature of the hygrothermograph (8) is 23 +/-5 ℃, and the relative humidity is 50 +/-20%.
5. The fresh air machine simulation pressure difference air volume test bench of claim 1, characterized in that: air pipe (2) both ends can be dismantled and be connected with reducing adapter (21), just the reducing angle of reducing adapter (21) is less than or equal to 15.
6. The fresh air machine simulation pressure difference air volume test bench of claim 1, characterized in that: front end static clamping ring (3) and rear end static clamping ring (6) structure are the same, all include that the circumference array sets up four on air pipe (2) lateral wall and static pressure hole (22) of air pipe (2) intercommunication, and every group is four static pressure hole (22) are through hose (31) intercommunication, just hose (31) are connected with manometer (33).
7. The fresh air blower simulation pressure difference air volume test bench according to claim 6, characterized in that: static pressure hole (22) on air pipe (2) department is connected with air duct (23) along static pressure hole (22) axial setting, the one end that static pressure hole (22) were kept away from in air duct (23) is equipped with bulb (24), be equipped with on hose (31) with bulb (24) complex soft hole (32).
8. The fresh air machine simulation pressure difference air volume test bench of claim 2, characterized in that: the diameter of ventilation pipeline (2) is D, the distance between front end static pressure ring (3) and ventilation pipeline (2) and the one end port that is close to is L1 and L1 > 4D.
9. The fresh air blower simulation pressure difference air volume test bench according to claim 8, characterized in that: the distance between one end of the airflow rectifier (5) close to the air volume tester (7) and the air volume tester (7) is L2, and L2 is more than 4D.
10. The fresh air blower simulation pressure difference air volume test bench according to claim 9, characterized in that: the distance between the air volume tester (7) and the end port close to the ventilation pipeline (2) is L3, and L3 is more than 4D.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120574453.0U CN214788152U (en) | 2021-03-20 | 2021-03-20 | Pressure difference simulation air volume test bench for fresh air machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120574453.0U CN214788152U (en) | 2021-03-20 | 2021-03-20 | Pressure difference simulation air volume test bench for fresh air machine |
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| Publication Number | Publication Date |
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| CN214788152U true CN214788152U (en) | 2021-11-19 |
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|---|---|---|---|
| CN202120574453.0U Active CN214788152U (en) | 2021-03-20 | 2021-03-20 | Pressure difference simulation air volume test bench for fresh air machine |
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2021
- 2021-03-20 CN CN202120574453.0U patent/CN214788152U/en active Active
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