Pressure loss measuring device

Abstract

The utility model discloses a pressure loss measuring device, and relates to the technical field of air pipe pressure loss testing, the pressure loss measuring device is used for measuring the pressure loss of an air conditioner air pipe, the pressure loss measuring device comprises an air volume meter, a pressure loss box, a steady flow jig and a pressure gauge, the pressure loss box comprises an input port and an output port, the input port is communicated with the air volume meter, and the output port is communicated with the steady flow jig. One end of the flow stabilizing jig is communicated with the output port, the other end of the flow stabilizing jig is used for being communicated with the air conditioner air pipe, and the pressure gauge is used for measuring the pressure in the pressure loss box and the pressure of an outlet of the air conditioner air pipe. When the pressure loss of the air conditioner air pipe is measured, the air volume meter outputs target air volume into the pressure loss box, and then air entering the pressure loss box is output into the flow stabilizing jig from the output port, so that a relatively long flowing path is provided for the air volume before the air volume enters the air conditioner air pipe, and the air body has more time to develop and be stable before entering the air conditioner air pipe; therefore, turbulent flow is reduced, and the flow direction of the air body is improved.

Description

Technical Field

[0001] This utility model relates to the field of duct pressure loss testing technology, and in particular to a pressure loss measuring device. Background Technology

[0002] Air conditioning duct pressure loss refers to the pressure loss caused by frictional resistance, bends, valves, supply and return air outlets, and other local resistances when air flows in the duct of an air conditioning ventilation system. This pressure loss is an important factor that must be considered in the design and operation of the ventilation system, as it directly affects the system's air volume, energy consumption, and air delivery effect, ultimately affecting the air conditioning's cooling, heating, defrosting, and defogging performance.

[0003] Air conditioning duct pressure loss testing is an important part of the installation and commissioning process of ventilation and air conditioning systems. Its purpose is to ensure the installation quality of the duct system, verify whether the ducts and their components can meet the design requirements, and ensure the efficiency and economy of the system operation.

[0004] In existing technologies, when measuring the pressure loss of air conditioning ducts, it is necessary to ventilate the duct during the test to test the pressure difference between the duct inlet and outlet, i.e., the pressure loss. The pressure loss obtained from the test is then compared with the design value to determine whether it is within the allowable range. However, during the test, when air is delivered into the duct through an airflow meter, the direction of the airflow is relatively chaotic and unstable, which can easily lead to inaccurate pressure loss measurement results.

[0005] Therefore, it is necessary to provide a new pressure loss measuring device to solve the above-mentioned technical problems. Utility Model Content

[0006] The main purpose of this invention is to propose a pressure loss measuring device, which aims to improve the technical problem of inaccurate test results in the existing air conditioning duct pressure loss measurement.

[0007] To achieve the above objectives, this utility model proposes a pressure loss measuring device for measuring pressure loss in air conditioning ducts. The pressure loss measuring device includes:

[0008] Anemometer;

[0009] A pressure loss box, the pressure loss box including an inlet and an outlet, the inlet being connected to the air volume meter;

[0010] A flow stabilizing fixture, one end of which is connected to the output port, and the other end of which is used to connect to the air conditioning duct;

[0011] A pressure gauge is used to measure the pressure in the pressure loss box and the pressure at the outlet of the air conditioning duct.

[0012] In one embodiment, the pressure loss measuring device further includes an input pipe, which is a corrugated pipe used to connect the input port and the air volume meter.

[0013] In one embodiment, the pressure loss measuring device further includes a sealing ring disposed at the connection between the inlet and the bellows.

[0014] In one embodiment, the air conditioning duct includes four air outlets and four air outlet pipes connected to each of the air outlets. The flow stabilizing fixture includes an extension pipe, one end of which is connected to the output port, and the other end of which is connected to the air conditioning duct. The extension pipe has four independent cavities inside, and the four cavities are respectively connected to the four air outlet pipes.

[0015] In one embodiment, the pressure loss measuring device further includes a base plate disposed at the bottom of the extension tube, the base plate having an opening for connecting the extension tube and the output port.

[0016] In one embodiment, a positioning block is provided at the bottom of the air conditioning duct, and a positioning groove is provided on the outer side wall of the extension pipe, the positioning groove being used to engage with the positioning block.

[0017] In one embodiment, the pressure loss measuring device further includes a flow stabilizer plate disposed in the inner cavity of the pressure loss box to separate and form a first space and a second space. The first space is located at the bottom of the second space. The input port is connected to the second space, and the output port is connected to the second space. Multiple flow channels are formed on the flow stabilizer plate, and the multiple flow channels connect the first space and the second space.

[0018] In one embodiment, the pressure loss box is an acrylic pressure loss box.

[0019] In one embodiment, the pressure gauge is in communication with the second space.

[0020] In one embodiment, the top of the pressure loss box is provided with multiple support members, which are used to support the four air outlet pipes respectively.

[0021] In the above scheme, the pressure loss measuring device is used to measure the pressure loss of the air conditioning duct. The pressure loss measuring device includes an air volume meter, a pressure loss box, a flow stabilizing fixture, and a pressure gauge. The pressure loss box includes an inlet and an outlet. The inlet is connected to the air volume meter. One end of the flow stabilizing fixture is connected to the outlet. The other end of the flow stabilizing fixture is used to connect to the air conditioning duct. The pressure gauge is used to measure the pressure in the pressure loss box and the pressure at the outlet of the air conditioning duct. Specifically, an airflow meter is installed at the inlet of the pressure loss box, and the air inlet of the air conditioning duct is installed at one end of the flow stabilizing fixture. The other end of the flow stabilizing fixture is installed at the outlet of the pressure loss box. The pressure in the pressure loss box and the pressure at the outlet of the flow stabilizing fixture are measured by a pressure gauge, and the difference is calculated to obtain the pressure loss. The measured pressure loss is compared with the design value to determine whether it is within the allowable range. When measuring the pressure loss of the air conditioning duct, the airflow meter outputs the target airflow into the pressure loss box, and the air entering the pressure loss box is output from the outlet to the flow stabilizing fixture. This provides a longer flow path for the airflow before it enters the air conditioning duct, allowing the air to develop and stabilize more before entering the duct, thereby reducing turbulence and helping to improve the airflow direction, making the airflow more straight and smooth. This makes the airflow more stable when entering the air conditioning duct and outputting from the outlet of the air conditioning duct, and the data measured by the pressure gauge is more accurate, thus improving the accuracy of the pressure loss measurement. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0023] Figure 1 A schematic diagram of the internal structure of an embodiment of the pressure loss measuring device provided by this utility model;

[0024] Figure 2 A schematic diagram of the overall structure of an embodiment of the pressure loss box provided by this utility model;

[0025] Figure 3 A schematic diagram showing the connection between the pressure loss box and the air conditioning duct provided by this utility model.

[0026] Explanation of icon numbers:

[0027] 100. Pressure loss measuring device; 1. Air volume meter; 2. Pressure loss box; 21. Inlet; 22. Outlet; 23. Flow stabilizer plate; 231. Flow channel; 24. First space; 25. Second space; 26. Support component; 3. Flow stabilizer fixture; 31. Extension pipe; 311. Cavity; 312. Positioning groove; 4. Inlet pipe; 5. Sealing ring; 6. Base plate; 61. Opening; 101. Air conditioning duct; 101a. Air outlet; 101b. Positioning block.

[0028] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0030] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0031] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0032] When measuring the pressure loss of air conditioning ducts, it is necessary to ventilate the duct during the test to measure the pressure difference between the duct inlet and outlet, i.e., the pressure loss. The measured pressure loss is then compared with the design value to determine whether it is within the allowable range. However, during the test, when air is delivered into the duct through an airflow meter, the direction of the airflow is relatively chaotic and unstable, which can easily lead to inaccurate pressure loss measurement results.

[0033] Please see Figures 1 to 3 This utility model proposes a pressure loss measuring device 100 for measuring the pressure loss of an air conditioning duct 101. The pressure loss measuring device 100 includes an airflow meter 1, a pressure loss chamber 2, a flow stabilizing fixture 3, and a pressure gauge. The pressure loss chamber 2 includes an inlet 21 and an outlet 22. The inlet 21 is connected to the airflow meter 1. One end of the flow stabilizing fixture 3 is connected to the outlet 22, and the other end of the flow stabilizing fixture 3 is connected to the air conditioning duct 101. The pressure gauge is used to measure the pressure in the pressure loss chamber 2 and the pressure at the outlet of the air conditioning duct 101. Specifically, the air volume meter 1 is installed at the input port 21 of the pressure loss box 2, and the air inlet of the air conditioning duct 101 is installed at one end of the flow stabilizing fixture 3. The other end of the flow stabilizing fixture 3 is installed at the output port 22 of the pressure loss box 2. Then, the pressure in the pressure loss box 2 and the pressure at the outlet 101a of the flow stabilizing fixture 3 are measured by a pressure gauge, and the difference is calculated to obtain the pressure loss. The measured pressure loss is compared with the design value to determine whether it is within the allowable range. When the pressure loss of the air conditioning duct 101 is measured, the air volume meter 1 outputs the target air volume into the pressure loss box 2. The air entering the pressure loss box 2 is then output from the outlet 22 to the flow stabilizing fixture 3. This provides a longer flow path for the air volume before it enters the air conditioning duct 101, allowing the air to develop and stabilize more before entering the duct, thereby reducing turbulence and improving the airflow direction. This makes the airflow more straight and smooth, resulting in a more stable airflow output from the outlet 101a of the air conditioning duct 101. Consequently, the pressure gauge readings are more accurate, thus improving the accuracy of pressure loss measurement.

[0034] Please see Figures 1 to 3In one embodiment, the pressure loss measuring device 100 further includes an input pipe 4, which is a corrugated pipe used to connect the input port 21 and the air volume meter 1. The air volume meter 1 and the pressure loss box 2 are connected via the input pipe 4, that is, one end of the input pipe 4 is connected to the input port 21, and the other end of the input pipe 4 is connected to the air volume meter 1. In this way, the input pipe 4 connects the air volume meter 1 and the pressure loss box 2. This connection between the air volume meter 1 and the pressure loss box 2 through the pipeline allows for a wider range of adjustment between the air volume meter 1 and the pressure loss box 2. Furthermore, by setting the input pipe 4 as a corrugated pipe, the corrugated pipe can further adapt to changes in the position between the air volume meter 1 and the pressure loss box 2, maintain the stability of the connection, and reduce the resistance of the air body, thereby reducing pressure loss. By reducing stress and vibration, this structural design helps to extend the service life of the air volume meter 1 and the pressure loss box 2.

[0035] Please see Figures 1 to 3 In one embodiment, the pressure loss measuring device 100 further includes a sealing ring 5, which is disposed at the connection between the inlet 21 and the bellows. The sealing ring 5 is fitted at the connection between the inlet 21 and the bellows of the pressure loss box 2, thus ensuring the airtightness of the inlet 21 of the pressure loss box 2 and preventing loss of the target air volume during the input process.

[0036] Please see Figure 2 and Figure 3 In one embodiment, the air conditioning duct 101 includes four air outlets 101a and four air outlet pipes connected to each air outlet 101a. The flow stabilizing fixture 3 includes an extension pipe 31. One end of the extension pipe 31 is connected to the output port 22, and the other end of the extension pipe 31 is used to connect to the air conditioning duct 101. The interior of the extension pipe 31 forms four independent cavities 311, and the four cavities 311 are respectively used to connect to the four air outlet pipes one by one. One end of the extension pipe 31 is connected to the output port 22 of the pressure loss box 2, and the other end of the extension pipe 31 is connected to the air inlet of the air conditioning duct 101. Since the air conditioning duct 101 has four air outlets 101a, and each of the four air outlets 101a is provided with an air outlet pipe, in order to ensure the stability of the airflow before entering each air outlet pipe, in this embodiment, four independent cavities 311 are provided inside the extension pipe 31. These four independent cavities 311 correspond one-to-one with the four air outlet pipes. In this way, the airflow has a separate space before entering each air outlet pipe to ensure the stability of the airflow and further improve the stability of the airflow volume of the air outlet pipe, thereby improving the accuracy of the air loss measurement.

[0037] Please see Figures 1 to 3In one embodiment, the pressure loss measuring device 100 further includes a base plate 6, which is disposed at the bottom of the extension tube 31. The base plate 6 has an opening 61 for connecting the extension tube 31 and the output port 22. Since the extension tube 31 is placed on top of the pressure loss box 2 during testing, a base plate 6 is provided between the pressure loss box 2 and the extension tube 31 to improve the stability of the extension tube 31 on the pressure loss box 2. This increases the support area of ​​the extension tube 31, thereby improving the placement stability of the extension tube 31. At the same time, the base plate 6 can also seal the gap between the extension tube 31 and the pressure loss box 2, thereby increasing the sealing between the extension tube 31 and the pressure loss box 2.

[0038] Please see Figure 2 and Figure 3 In one embodiment, a positioning block 101b is provided at the bottom of the air conditioning duct 101, and a positioning groove 312 is provided on the outer wall of the extension pipe 31. The positioning groove 312 is used to engage with the positioning block 101b. With the positioning groove 312 on the outer wall of the extension pipe 31 and the corresponding positioning block 101b on the inner wall of the air conditioning duct 101, the positioning block 101b is engaged with the positioning groove 312 when connecting the extension pipe 31 and the duct being measured. This enhances the stability of the connection between the extension pipe 31 and the air conditioning duct 101.

[0039] Furthermore, there are multiple positioning slots 312 and multiple positioning blocks 101b. The number of multiple positioning slots 312 and the number of multiple positioning blocks 101b are equal and are set in a one-to-one correspondence. This can make the connection strength between the extension pipe 31 and the air conditioning duct 101 higher, and further improve the stability of the connection between the extension pipe 31 and the air conditioning duct 101.

[0040] Furthermore, the extension tube 31 is made using 3D printing technology and can be customized according to the shape of the air conditioning duct 101 and the number of air outlets, thereby optimizing the internal airflow performance and reducing material waste and energy consumption.

[0041] Please see Figure 1In one embodiment, the pressure loss measuring device 100 further includes a flow stabilizer plate 23, which is disposed in the inner cavity of the pressure loss box 2 to separate and form a first space 24 and a second space 25. The first space 24 is located at the bottom of the second space 25, with an input port 21 connected to it and an output port 22 connected to the second space 25. A plurality of flow channels 231 are formed on the flow stabilizer plate 23, which connect the first space 24 and the second space 25. Specifically, the inner cavity of the pressure loss box 2 is divided into a first space 24 and a second space 25 by the air conditioning duct 101. The inlet 21 is connected to the first space 24 and the outlet 22 is connected to the second space 25. Multiple flow channels 231 are formed on the flow stabilizer 23, which connect the first space 24 and the second space 25. In this way, the air first enters the first space 24. At this time, the air flow in the first space 24 is turbulent and unstable. Then, the air in the first space 24 enters the second space 25 through the multiple flow channels 231, which makes the air in the second space 25 more stable than that in the first space 24.

[0042] In one embodiment, the pressure loss chamber 2 is an acrylic pressure loss chamber 2. The pressure loss chamber 2 is made of acrylic material, which has higher transparency, allowing for direct observation of pressure changes and fluid flow inside the pressure loss chamber 2; at the same time, acrylic material has a low density, making the pressure loss chamber 2 lightweight and easy to handle and install; acrylic material also has high impact resistance and load-bearing capacity, enabling it to withstand a certain amount of pressure.

[0043] In one embodiment, the pressure gauge is connected to the second space 25. Connecting the pressure gauge to the second space 25 ensures more stable pressure measurements because the airflow within the second space 25 is stable.

[0044] Please see Figure 1 In one embodiment, the top of the pressure loss box 2 is provided with multiple support members 26, which are used to support the four air outlet pipes respectively. During testing, the extension pipe 31 is placed on the top of the pressure loss box 2. In order to ensure that the placement position of the four air outlet pipes in the air conditioning duct 101 is consistent with the position inside the actual vehicle, multiple support members 26 are provided on the top of the pressure loss box 2, and each support member 26 is used to support the four air outlet pipes respectively. This ensures that the placement position of the four air outlet pipes in the air conditioning duct 101 is consistent with the position inside the actual vehicle, so that the measured data is consistent with the data when the air conditioning duct 101 is placed in the actual vehicle.

[0045] The above description is merely an exemplary embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A pressure loss measuring device for measuring pressure loss in air conditioning ducts, characterized in that, include: Anemometer; A pressure loss box, the pressure loss box including an inlet and an outlet, the inlet being connected to the air volume meter; A flow stabilizing fixture, one end of which is connected to the output port, and the other end of which is used to connect to the air conditioning duct; A pressure gauge is used to measure the pressure in the pressure loss box and the pressure at the outlet of the air conditioning duct.

2. The pressure loss measuring device as described in claim 1, characterized in that, The pressure loss measuring device also includes an input pipe, which is a corrugated pipe used to connect the input port and the air volume meter.

3. The pressure loss measuring device as described in claim 2, characterized in that, The pressure loss measuring device also includes a sealing ring, which is disposed at the connection between the inlet and the bellows.

4. The pressure loss measuring device as described in claim 1, characterized in that, The air conditioning duct includes four air outlets and four air outlet pipes connected to each air outlet. The flow stabilizing fixture includes an extension pipe. One end of the extension pipe is connected to the output port, and the other end of the extension pipe is used to connect to the air conditioning duct. The extension pipe has four independent cavities inside, and the four cavities are respectively used to connect to the four air outlet pipes.

5. The pressure loss measuring device as described in claim 4, characterized in that, The pressure loss measuring device also includes a base plate, which is disposed at the bottom of the extension tube and has an opening for connecting the extension tube and the output port.

6. The pressure loss measuring device as described in claim 4, characterized in that, A positioning block is provided at the bottom of the air conditioning duct, and a positioning groove is provided on the outer side wall of the extension pipe, the positioning groove being used to engage with the positioning block.

7. The pressure loss measuring device as described in claim 4, characterized in that, The pressure loss measuring device further includes a flow stabilizer plate, which is disposed in the inner cavity of the pressure loss box to separate and form a first space and a second space. The first space is located at the bottom of the second space. The input port is connected to the second space, and the output port is connected to the second space. Multiple flow channels are formed on the flow stabilizer plate, and the multiple flow channels connect the first space and the second space.

8. The pressure loss measuring device as described in claim 7, characterized in that, The pressure loss box is an acrylic pressure loss box.

9. The pressure loss measuring device as described in claim 7, characterized in that, The pressure gauge is connected to the second space.

10. The pressure loss measuring device as described in claim 8, characterized in that, The top of the pressure loss box is provided with multiple support members, which are used to support the four air outlet pipes respectively.

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