Nozzle type differential pressure ring air volume monitoring system and method thereof

Abstract

The invention belongs to the technical field of air volume monitoring, and particularly relates to a nozzle type differential pressure ring air volume monitoring system and a method thereof.The nozzle type differential pressure ring air volume monitoring system comprises a fan, a nozzle and a differential pressure sensor, the narrow end of the nozzle corresponds to and is fixedly connected with an air inlet of the fan, a differential pressure ring is arranged at the narrow end of the nozzle, and a static pressure sampler is arranged on the conical surface of the nozzle; according to the nozzle differential pressure ring air volume measuring system, air volume detection can be carried out regularly, an operator does not need to hold a detection instrument by hand, the situation that the operator must measure the air volume at a high position is avoided, and in a laboratory test, the air volume is not required to be measured at a high position, so that the air volume is not required to be measured at a high position. The air volume measurement precision of the system is within + / -5%, and the detection result is stable.

Description

Technical Field

[0001] The present invention belongs to the technical field of air volume monitoring technology, and in particular relates to a nozzle-type pressure differential ring air volume monitoring system and a method thereof. Background Art

[0002] Currently, office buildings, hotels, and shopping malls all have sealed windows, lacking openable windows. Air conditioning systems provide ventilation. If the fresh air volume of these systems doesn't meet hygienic standards, maintaining indoor air quality is difficult, which can easily lead to illness, allergies, and other discomfort. Furthermore, property management companies often fail to adequately clean and maintain centralized air conditioning systems, allowing dirt and grime to accumulate in the ducts, resulting in poor air exchange efficiency, increased wind resistance, and energy loss. To improve the hygienic quality of centralized air conditioning systems in public places, regular testing of air volume and other environmental parameters is necessary. These test instruments are typically held by a person at the air outlet to be tested. For higher vents, operators must stand on a ladder or other support structure, which is both dangerous and physically demanding. Test results are significantly affected by operator manipulation. Summary of the Invention

[0003] In order to solve the above technical problems, the present invention provides a new technical solution:

[0004] The nozzle-type pressure differential ring air volume monitoring system includes a fan, a nozzle and a differential pressure sensor. The differential pressure transmitter is fixed on the outside of the nozzle. The narrow end of the nozzle corresponds to and is fixedly connected to the air inlet of the fan. A pressure differential ring is provided at the narrow end of the nozzle, and a static pressure sampler is provided on the conical surface of the nozzle. The pressure differential ring includes a low-pressure air intake manifold and a low-pressure air intake pipe. The low-pressure air intake manifold is arranged in a closed ring shape on the outside of the narrow end of the nozzle, and a number of connecting pipes are provided on the side of the low-pressure air intake manifold close to the nozzle. One end of the connecting pipe is connected to the low-pressure air intake manifold, and the other end passes through the nozzle to connect to the inner side of the nozzle. One end of the low-pressure air intake pipe is connected to the inside of the low-pressure air intake manifold, and the other end is connected to the low-pressure end detection port of the differential pressure sensor; the static pressure sampler includes a high-pressure air intake pipe, one end of the high-pressure air intake pipe passes through the conical surface of the nozzle and is connected to the inner side of the nozzle, and the other end is connected to the high-pressure end detection port of the differential pressure sensor.

[0005] Furthermore, the connecting pipes are evenly distributed on one side of the low-pressure air intake manifold close to the nozzle. The pressure at the narrow end of the nozzle is sampled through multiple evenly distributed connecting pipes, which can ensure the accuracy of the measured pressure data and air volume data.

[0006] Furthermore, the nozzle is a trumpet-shaped nozzle or a trapezoidal nozzle. Nozzles of different shapes are provided, and a suitable nozzle type can be selected according to different usage conditions.

[0007] Furthermore, the nozzle-type pressure differential ring air volume monitoring system is also provided with a digital display screen, which is electrically connected to the differential pressure sensor. The digital display screen is used to display the air volume and pressure data obtained by the differential pressure sensor to help operators monitor and debug the fan.

[0008] Furthermore, one end of the connecting pipe and the high-pressure air inlet pipe located on the inner side of the nozzle is flush with the inner surface of the nozzle, and one end of the connecting pipe and the high-pressure air inlet pipe located on the inner side of the nozzle matches the inner side profile of the nozzle, and the connecting pipe and the high-pressure air inlet pipe are polished so that they cannot affect the normal air intake of the fan, thereby avoiding affecting the test results.

[0009] On this basis, a further step is provided to provide an air volume detection method applicable to the nozzle-type pressure differential ring air volume monitoring system, comprising the following steps:

[0010] Step 1: Detect the pressures of the high-pressure end detection port and the low-pressure end detection port by using a differential pressure sensor, which are recorded as P1 and P2 respectively, and obtain the pressure difference between the high-pressure end detection port and the low-pressure end detection port, which is recorded as ΔP;

[0011] Step 2: Based on the nozzle principle and Bernoulli equation, substitute ΔP into the following formula to calculate the air volume Q:

[0012]

[0013] Where: Q represents the air volume of the fan, in m 2 / h; ρ is the air density, unit is kg / m 2 ; K is the measurement coefficient, ranging from 0.75 to 0.83; ΔP is the pressure difference, the unit is Pa.

[0014] The present invention also includes other devices or components that enable the nozzle-type differential pressure ring air volume monitoring system and method to function properly, all of which are conventional techniques in the art. Furthermore, the blower and differential pressure sensor, not otherwise specified in the present invention, all employ conventional techniques in the art.

[0015] The working principle of the present invention is: the system is based on the flow principle of the nozzle, uses the fan air intake nozzle to set the pressure sampling point, collects the pressure of the narrow part and cone surface of the nozzle, and calculates the flow rate by measuring the static pressure drop of the nozzle.

[0016] The beneficial effect of the present invention is that the device introduces a nozzle pressure differential ring air volume measurement system and method, which can regularly detect the air volume without the operator having to hold the detection instrument, avoiding the operator having to measure the air volume at a high place. In laboratory tests, the air volume measurement accuracy of the system is within + / -5%, and the detection results are stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention will be further described below with reference to the accompanying drawings and examples.

[0018] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0019] Figure 2 It is a structural schematic diagram of the nozzle in the present invention.

[0020] Figure 3 It is a side structural schematic diagram of the nozzle in the present invention.

[0021] Figure 4 It is a structural schematic diagram of the pressure differential ring in the present invention. DETAILED DESCRIPTION

[0022] The present invention is described below in conjunction with the accompanying drawings and specific embodiments of the present invention. The description herein is only used to explain the present invention and is not intended to limit the present invention. Based on the embodiments of the present invention, any modifications, equivalent substitutions, improvements, etc. made by those skilled in the art without creative work based on all other embodiments obtained in the present invention should be included in the scope of protection of the present invention.

[0023] Example

[0024] like Figures 1 to 4 As shown, the nozzle-type pressure differential ring air volume monitoring system provided by the present invention includes a fan 1, a nozzle 2 and a differential pressure sensor (not shown in the figure), the differential pressure transmitter is fixed on the outside of the nozzle, the narrow end of the nozzle 2 corresponds to the air inlet of the fan 1 and is fixedly connected, the narrow end of the nozzle 2 is provided with a pressure differential ring, and a static pressure sampler is provided on the conical surface of the nozzle 2, the pressure differential ring includes a low-pressure air intake manifold 3 and a low-pressure air intake pipe 4, the low-pressure air intake manifold 3 is arranged in a closed ring shape on the outside of the narrow end of the nozzle 2, and a plurality of connecting pipes 5 are provided on the side of the low-pressure air intake manifold 3 close to the nozzle 2, one end of the connecting pipe 5 is connected to the low-pressure air intake manifold 3, and the other end passes through the nozzle 2 to connect to the inner side of the nozzle 2, one end of the low-pressure air intake pipe 4 is connected to the interior of the low-pressure air intake manifold 3, and the other end is connected to the low-pressure end detection port of the differential pressure sensor; the static pressure sampler includes a high-pressure air intake pipe 6, one end of the high-pressure air intake pipe 6 passes through the conical surface of the nozzle 2 and is connected to the inner side of the nozzle 2, and the other end is connected to the high-pressure end detection port of the differential pressure sensor.

[0025] As a further measure of the present invention, the connecting pipes 5 are evenly distributed on one side of the low-pressure air intake main pipe 3 close to the nozzle 2. The pressure at the narrow end of the nozzle 2 is sampled through multiple evenly distributed connecting pipes 5, which can ensure the accuracy of the measured pressure data and air volume data; the nozzle 2 is a trumpet-shaped nozzle or a trapezoidal nozzle, and nozzles 2 of different shapes are provided. The appropriate type of nozzle 2 can be selected according to different usage conditions; the nozzle-type pressure differential ring air volume monitoring system is also provided with a digital display screen (not shown in the figure), which is electrically connected to the differential pressure sensor. The digital display screen is used to display the air volume and pressure data obtained by the differential pressure sensor to help operators monitor and debug the fan 1; the connecting pipe 5 and the high-pressure air intake pipe 6 are located at one end on the inner side of the nozzle 2 flush with the inner surface of the nozzle 2, and the connecting pipe 5 and the high-pressure air intake pipe 6 are located at one end on the inner side of the nozzle 2 to match the inner side profile of the nozzle 2, and the connecting pipe 5 and the high-pressure air intake pipe 6 are polished so that they cannot affect the normal air intake of the fan 1, thereby avoiding affecting the detection results.

[0026] This embodiment also provides an air volume detection method applicable to the nozzle-type pressure differential ring air volume monitoring system, comprising the following steps:

[0027] Step 1: Detect the pressures of the high-pressure end detection port and the low-pressure end detection port by using a differential pressure sensor, which are recorded as P1 and P2 respectively, and obtain the pressure difference between the high-pressure end detection port and the low-pressure end detection port, which is recorded as ΔP;

[0028] Step 2: Based on the nozzle principle and Bernoulli equation, substitute ΔP into the following formula to calculate the air volume Q:

[0029]

[0030] Where: Q represents the air volume of the fan, in m 2 / h; ρ is the air density, unit is kg / m 2 ; K is the measurement coefficient, ranging from 0.75 to 0.83; ΔP is the pressure difference, the unit is Pa.

[0031] The working principle of the invention is: the system is based on the flow principle of nozzle 2, uses nozzle 2 of fan 1 to set pressure sampling points, collects the pressure of the narrow part and conical surface of nozzle 2, and calculates the flow rate by measuring the static pressure drop of nozzle 2.

[0032] While the embodiments of the present invention have been described above, the above description is intended to be exemplary, not exhaustive, and not limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments.

Claims

1. A nozzle-type differential pressure ring air volume monitoring system, comprising a fan, a nozzle, and a differential pressure sensor. The differential pressure transmitter is fixed to the outside of the nozzle, and the narrow end of the nozzle corresponds to and is fixedly connected to the air inlet of the fan. It is characterized by: A pressure differential ring is provided at the narrow end of the nozzle, and a static pressure sampler is provided on the conical surface of the nozzle. The pressure differential ring includes a low-pressure intake manifold and a low-pressure intake pipe. The low-pressure intake manifold is arranged in a closed ring shape on the outside of the narrow end of the nozzle, and a number of connecting pipes are provided on the side of the low-pressure intake manifold close to the nozzle. One end of the connecting pipe is connected to the low-pressure intake manifold, and the other end passes through the nozzle to connect to the inner side of the nozzle. One end of the low-pressure intake pipe is connected to the interior of the low-pressure intake manifold, and the other end is connected to the low-pressure end detection port of the differential pressure sensor; the static pressure sampler includes a high-pressure intake pipe, one end of the high-pressure intake pipe passes through the conical surface of the nozzle and is connected to the inner side of the nozzle, and the other end is connected to the high-pressure end detection port of the differential pressure sensor.

2. The nozzle-type pressure differential ring air volume monitoring system according to claim 1, characterized in that: The connecting pipes are evenly distributed on one side of the low-pressure air intake manifold close to the nozzle.

3. The nozzle-type pressure differential ring air volume monitoring system according to claim 1, characterized in that: The nozzle is a trumpet-shaped nozzle or a trapezoidal nozzle.

4. The nozzle-type pressure differential ring air volume monitoring system according to claim 1, characterized in that: The nozzle type pressure differential ring air volume monitoring system is further provided with a digital display screen, which is electrically connected to the differential pressure sensor.

5. The nozzle-type pressure differential ring air volume monitoring system according to claim 1, characterized in that: One end of the connecting pipe and the high-pressure air inlet pipe located inside the nozzle is flush with the inner surface of the nozzle.

6. An air volume detection method based on the nozzle-type pressure differential ring air volume monitoring system according to any one of claims 1 to 5, characterized in that: The following steps are included: Step 1: Detect the pressures of the high-pressure end detection port and the low-pressure end detection port by using a differential pressure sensor, which are recorded as P1 and P2 respectively, and obtain the pressure difference between the high-pressure end detection port and the low-pressure end detection port, which is recorded as ΔP; Step 2: Based on the nozzle principle and Bernoulli equation, substitute ΔP into the following formula to calculate the air volume Q: Where: Q represents the air volume of the fan, in m 2 / h; ρ is the air density, unit is kg / m 2 ; K is the measurement coefficient, ranging from 0.75 to 0.83; ΔP is the pressure difference, the unit is Pa.

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