CN218097875U

CN218097875U - Nozzle chamber for air flow measurement

Info

Publication number: CN218097875U
Application number: CN202221844754.1U
Authority: CN
Inventors: 叶檀; 尤之翔; 董鹰飞
Original assignee: Foshan Anzheng Testing Technology Service Co ltd
Current assignee: Foshan Anzheng Testing Technology Service Co ltd
Priority date: 2022-07-18
Filing date: 2022-07-18
Publication date: 2022-12-20
Anticipated expiration: 2032-07-18

Abstract

The utility model discloses a nozzle chamber for air flow measurement, including the shell, be equipped with air intake and air outlet on the shell, be provided with in the shell and be used for separating the baffle of air inlet room and air exhaust room with the shell internal partitioning, be provided with a plurality of groups nozzle device that are used for intercommunication air inlet room and air exhaust room on the baffle, be provided with on the shell and be used for detecting the nozzle front and back differential pressure measuring device of pressure difference between air inlet room and the air exhaust room, be provided with the draught fan that is used for adjusting static pressure in the air exhaust room, the output and the air outlet intercommunication of draught fan. The utility model discloses a nozzle chamber for air flow measurement has degree of automation height, improves and measures work efficiency, effectively improves the advantage of the air mass flow measurement degree of accuracy.

Description

Nozzle chamber for air flow measurement

Technical Field

The utility model relates to an air conditioning system capability test equipment technical field, concretely relates to a nozzle room for air flow measurement.

Background

At present, an enthalpy difference chamber is usually used for testing the refrigerating and heating capacities of the heating ventilation air conditioner, and the refrigerating (heat) quantity is measured by an air enthalpy difference method. The enthalpy difference chamber comprises a peripheral heat insulation structure of the test chamber, an air handling unit, a temperature and humidity sampling system, an air flow measuring device, a test chamber measurement control system and a measurement data acquisition system, wherein the air flow measuring device generally comprises a static pressure chamber, a measuring chamber and an exhaust chamber, a nozzle is arranged in the measuring chamber, the static pressure value of the static pressure chamber is maintained in a required range through an exhaust fan during measurement, and the air flow is measured through detecting the pressure difference value before and after the nozzle and the temperature and humidity value at an air inlet. However, the existing measuring chamber cannot realize automatic conversion of measuring conditions, which affects the air injection effect of the nozzle, so that the measurement of the pressure difference before and after the nozzle is not accurate enough, the measurement of the air flow is affected, and the automatic accurate measurement is not easy to perform.

Disclosure of Invention

The to-be-solved technical problem of the utility model is to overcome the not enough of prior art existence, provide an degree of automation height, improve measurement work efficiency, effectively improve the nozzle chamber that is used for air flow measurement of the air mass flow measurement degree of accuracy.

In order to solve the technical problem, the utility model discloses a following technical scheme:

the utility model provides a nozzle chamber for air flow measurement, includes the shell, be equipped with air intake and air outlet on the shell, be provided with in the shell be used for with the shell internal partitioning is the baffle of air inlet room and air exhaust room, be provided with on the baffle and be used for the intercommunication the air inlet room with a plurality of nozzle device of group of air exhaust room, be provided with on the shell and be used for detecting the air inlet room with little differential pressure measuring device around the nozzle of the pressure difference between the air exhaust room, be provided with the draught fan that is used for adjusting the static pressure in the air exhaust room, the output of draught fan with the air outlet intercommunication.

As a further improvement of the above technical solution:

the nozzle device includes a nozzle and an on-off control mechanism for switching the nozzle between an on state or an off state.

The on-off control mechanism comprises a mounting seat, a connecting arm is connected to the mounting seat in a rotatable mode, a first driving mechanism used for driving the connecting arm to rotate is arranged on the mounting seat, a cover pressing plate is arranged on the connecting arm, the connecting arm can be arranged on the nozzle in a covering mode through rotating, the cover pressing plate covers the nozzle and is in an open circuit state or the cover pressing plate is not covered on the nozzle and is in switching between access states.

The number of the groups of the nozzle devices is four, wherein the diameter of the output port of one group of the nozzles is 100mm, the diameter of the output port of the two groups of the nozzles is 150mm, and the diameter of the output port of one group of the nozzles is 189mm.

The micro-differential pressure measuring device comprises a front pressure sampling mechanism for detecting the pressure in the air inlet chamber and a rear pressure sampling mechanism for detecting the pressure in the air exhaust chamber.

Preceding pressure sampling mechanism with back pressure sampling mechanism includes four groups of pressure gauges respectively, the air inlet room with all evenly be provided with four groups along circumference on the room of airing exhaust and measure the interface, the pressure gauge correspond set up in measure in the interface.

The exhaust chamber is internally provided with a diffusion baffle which is evenly provided with a plurality of groups of overflowing holes.

And a first maintenance door and a second maintenance door are arranged on the exhaust chamber.

Compared with the prior art, the utility model has the advantages of:

the utility model discloses a little differential pressure measuring device and draught fan around the nozzle room for air flow measurement and outside electrical control cabinet electric connection around the nozzle, when certain group's nozzle device is opened or closed according to measuring the operating mode as required, can realize opening automatically or closing nozzle device through artifical input control signal, little differential pressure measuring device automated inspection around the nozzle, and in will detecting data acquisition electrical control cabinet, degree of automation is high, be favorable to improving measurement work efficiency, effectively improve the air mass flow measurement degree of accuracy.

Drawings

Fig. 1 is a schematic view of a nozzle chamber.

FIG. 2 is a schematic view of another angle of the nozzle chamber.

FIG. 3 is a schematic view of a half-section of a nozzle chamber.

FIG. 4 is a schematic diagram of the on-off control mechanism.

Illustration of the drawings:

1. a housing; 101. an air inlet; 102. an air outlet; 103. an air inlet chamber; 104. an exhaust chamber; 2. a partition plate; 3. a nozzle device; 301. a nozzle; 302. an on-off control mechanism; 3021. a mounting seat; 3022. a connecting arm; 3023. a first drive mechanism; 3024. covering the pressing plate; 4. a micro differential pressure measuring device in front of and behind the nozzle; 401. a front pressure sampling mechanism; 402. a rear pressure sampling mechanism; 5. an induced draft fan; 6. a diffusion baffle; 7. a first maintenance door; 8. and (7) repairing the door in a second dimension.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

As shown in fig. 1 to 3, the nozzle chamber for air flow measurement of the present embodiment includes a housing 1, an air inlet 101 and an air outlet 102 are provided on the housing 1, a partition plate 2 for dividing the interior of the housing 1 into an air inlet chamber 103 and an air outlet chamber 104 is provided in the housing 1, a plurality of sets of nozzle devices 3 for communicating the air inlet chamber 103 with the air outlet chamber 104 are provided on the partition plate 2, a nozzle front-rear micro-differential pressure measuring device 4 for detecting a pressure difference between the air inlet chamber 103 and the air outlet chamber 104 is provided on the housing 1, an induced draft fan 5 for adjusting a static pressure is provided in the air outlet chamber 104, and an output end of the induced draft fan 5 is communicated with the air outlet 102. This a nozzle device 3 in nozzle chamber for air flow measurement, little differential pressure measuring device 4 and draught fan 5 and outside electrical apparatus switch board electric connection around the nozzle, when needs open or close certain group of nozzle device 3 according to measuring the operating mode, can realize opening automatically or close nozzle device 3 through artifical input control signal, little differential pressure measuring device 4 automated inspection around the nozzle, and will detect in data acquisition electrical apparatus switch board, degree of automation is high, be favorable to improving measurement work efficiency, effectively improve the air mass flow measurement degree of accuracy.

Preferably, the nozzle device 3 includes a nozzle 301 and an on-off control mechanism 302 for switching the nozzle 301 between an on state or an off state. In this embodiment, the on-off control mechanism 302 is electrically connected to the electrical control cabinet, and the operator can input a control signal to the electrical control cabinet to switch the control nozzle 301 between the on state and the off state, so as to meet the measurement requirement.

As shown in fig. 4, the on-off control mechanism 302 preferably includes a mounting base 3021, a connecting arm 3022 is rotatably connected to the mounting base 3021, a first driving mechanism 3023 for driving the connecting arm 3022 to rotate is provided on the mounting base 3021, a cover pressure plate 3024 is provided on the connecting arm 3022, and the connecting arm 3022 can be switched between an open circuit state where the cover pressure plate 3024 covers the nozzle 301 and a closed circuit state where the cover pressure plate 3024 does not cover the nozzle 301 by a rotating action. In this embodiment, the mounting seat 3021 is fixedly connected to the inner wall of the exhaust chamber 104, the connecting arm 3022 is hinged to the mounting seat 3021, the first driving mechanism 3023 adopts a telescopic cylinder, a telescopic rod of the telescopic cylinder is hinged to one end of the connecting arm 3022, the cover pressing plate 3024 is fixedly connected to the other end of the connecting arm 3022, the telescopic cylinder is electrically connected to the electrical control cabinet, and a worker can control the telescopic rod to perform telescopic actions through inputting control signals, so as to realize the switching of the nozzle 301 between the on-state and the off-state, which has the advantages of simple structure, convenient and fast installation and disassembly processes, and low cost.

Preferably, the number of groups of nozzle devices 3 is four, wherein the diameter of the output port of one group of nozzles 301 is 100mm, the diameter of the output port of two groups of nozzles 301 is 150mm, and the diameter of the output port of one group of nozzles 301 is 189mm. In this embodiment, four sets of nozzles 301 are disposed at four corners of the partition board 2, the distance between the centers of the sets of nozzles 301 should be no less than 3 times the throat diameter of the larger set of nozzles 301, and the distance from the center of any one set of nozzles 301 to the nearest sidewall of the intake chamber 103 or the exhaust chamber 104 should be no less than 1.5 times the nozzle 301; the on-off control mechanism 302 is driven to act by inputting a control signal by a worker, so that the air in the air inlet chamber 103 enters the air outlet chamber 104 through one or more groups of nozzles 301.

Preferably, the nozzle front-rear micro differential pressure measuring device 4 comprises a front pressure sampling mechanism 401 for detecting the pressure in the air inlet chamber 103 and a rear pressure sampling mechanism 402 for detecting the pressure in the air outlet chamber 104.

Preferably, the front pressure sampling mechanism 401 and the rear pressure sampling mechanism 402 respectively include four pressure gauges, four measurement interfaces are uniformly arranged on the air intake chamber 103 and the air exhaust chamber 104 along the circumferential direction, and the pressure gauges are correspondingly arranged in the measurement interfaces. In this embodiment, four groups of pressure gauges are arranged on the air inlet chamber 103 and the air outlet chamber 104, and each group of pressure gauge is arranged in the center of four side surfaces of the air inlet chamber 103 and the air outlet chamber 104 respectively, which is beneficial to improving the accuracy of data, each group of pressure gauges transmits detected data to an electric appliance control cabinet for analysis and calculation, so as to obtain the pressure difference between the air inlet chamber 103 and the air outlet chamber 104, measure the actual air outlet volume of the air conditioning unit according to the national standard requirements of different products, and refer to the content of A6 in the appendix a of GB/T17758-2010.

Preferably, a diffusion baffle 6 is arranged in the exhaust chamber 104, and a plurality of groups of overflowing holes are uniformly arranged on the diffusion baffle 6. In the present embodiment, the diffusion baffle 6 is installed in the exhaust chamber 104 on the leeward side of the nozzle device 3 and perpendicular to the air flow direction, and the distance between the diffusion baffle 6 and the output end of the nozzle device 3 is at least 2.5 times the throat diameter (189 mm) of the maximum nozzle 301; the outer edge of the diffusion baffle 6 is matched with the inner wall of the exhaust chamber 104, so that the air can completely flow through the diffusion baffle 6, and the smoothness of the air flow is improved.

Preferably, the exhaust chamber 104 is provided with a first maintenance door 7 and a second maintenance door 8. In this embodiment, first maintenance door 7 sets up the position between baffle 2 and diffusion baffle 6, and the staff of being convenient for maintains nozzle device 3 in the room 104 of airing exhaust, and second maintenance door 8 sets up the position between diffusion baffle 6 and draught fan 5, and the staff of being convenient for maintains draught fan 5 in the room 104 of airing exhaust, first maintenance door 7 and second maintenance door 8 and shell 1 sealing connection.

The above description is only the preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. To those skilled in the art, the modifications and changes that can be made without departing from the scope of the present invention shall be considered as the protection scope of the present invention.

Claims

1. The utility model provides a nozzle chamber for air flow measurement, a serial communication port, includes shell (1), be equipped with air intake (101) and air outlet (102) on shell (1), be provided with in shell (1) be used for with shell (1) internal separation is baffle (2) of air intake room (103) and air discharge room (104), be provided with on baffle (2) and be used for the intercommunication air intake room (103) with a plurality of groups nozzle device (3) of air discharge room (104), be provided with on shell (1) and be used for detecting air intake room (103) with micro-differential pressure measuring device (4) around the nozzle of the pressure difference between air discharge room (104), be provided with draught fan (5) that are used for adjusting the static pressure in air discharge room (104), the output of draught fan (5) with air outlet (102) intercommunication.

2. A nozzle chamber for air flow measurement according to claim 1, characterized in that the nozzle device (3) comprises a nozzle (301) and an on-off control mechanism (302) for switching the nozzle (301) between an on-state or an off-state.

3. A nozzle chamber for air flow measurement according to claim 2, characterized in that the on-off control mechanism (302) comprises a mounting base (3021), a connecting arm (3022) is rotatably connected to the mounting base (3021), a first driving mechanism (3023) for driving the connecting arm (3022) to rotate is arranged on the mounting base (3021), a cover pressure plate (3024) is arranged on the connecting arm (3022), and the connecting arm (3022) can be switched between an open circuit state in which the cover pressure plate (3024) covers the nozzle (301) and an open circuit state in which the cover pressure plate (3024) does not cover the nozzle (301) through a rotating action.

4. A nozzle chamber for air flow measurement according to claim 2, characterized in that the number of groups of nozzle devices (3) is four, wherein the outlet port diameter of one group of nozzles (301) is 100mm, the outlet port diameter of two groups of nozzles (301) is 150mm, and the outlet port diameter of one group of nozzles (301) is 189mm.

5. Nozzle chamber for air flow measurement according to claim 1, characterized in that the nozzle front and back micro differential pressure measurement device (4) comprises a front pressure sampling mechanism (401) for detecting the pressure in the intake chamber (103) and a back pressure sampling mechanism (402) for detecting the pressure in the exhaust chamber (104).

6. The nozzle chamber for air flow measurement according to claim 5, wherein the front pressure sampling mechanism (401) and the rear pressure sampling mechanism (402) respectively comprise four sets of pressure gauges, four sets of measuring interfaces are uniformly arranged on the air inlet chamber (103) and the air outlet chamber (104) along the circumferential direction, and the pressure gauges are correspondingly arranged in the measuring interfaces.

7. Nozzle chamber for air flow measurement according to claim 1, characterized in that a diffusion baffle (6) is arranged in the exhaust chamber (104), and a plurality of groups of overflowing holes are uniformly arranged on the diffusion baffle (6).

8. Nozzle chamber for air flow measurement according to claim 1, characterized in that a first maintenance door (7) and a second maintenance door (8) are arranged on the exhaust chamber (104).