CN110455566B - Accelerated dust accumulation testing device for air conditioner heat exchanger - Google Patents
Accelerated dust accumulation testing device for air conditioner heat exchanger Download PDFInfo
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- CN110455566B CN110455566B CN201910775102.3A CN201910775102A CN110455566B CN 110455566 B CN110455566 B CN 110455566B CN 201910775102 A CN201910775102 A CN 201910775102A CN 110455566 B CN110455566 B CN 110455566B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M99/00—Subject matter not provided for in other groups of this subclass
- G01M99/002—Thermal testing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M99/00—Subject matter not provided for in other groups of this subclass
- G01M99/005—Testing of complete machines, e.g. washing-machines or mobile phones
Abstract
The invention discloses an accelerated dust deposition testing device for an air conditioner heat exchanger, which comprises a dust box, a dust feeder, a dust box fan, a hot air measuring channel, an air channel fan, an air channel turning plate, a motor, a dust concentration instrument, a PLC (programmable logic controller) control device, a thermocouple, a pressure sensor, a data acquisition instrument, an electric heating rod and an air conditioner heat exchanger sample. The device of the invention has three working modes: the device comprises a uniform dust-containing environment forming mode, a dust-containing air stable circulation flowing mode and a heat exchange performance testing mode. Through the application of the three working modes, the problems that dust concentration is uneven due to the fact that dust particles sink under the action of gravity and the dust concentration is reduced due to the fact that dust is continuously deposited on the surface of the heat exchanger can be solved, machine moving is not needed in the process of testing the performance of the heat exchanger, and the problem that repeatability of a testing result is reduced due to the fact that dust deposited on the surface of the heat exchanger drops in the process of moving the machine is solved.
Description
Technical Field
The invention relates to the technical field of refrigeration and air conditioning, in particular to an accelerated dust accumulation testing device for an air conditioner heat exchanger.
Background
The heat exchanger in the air conditioner can cause performance degradation due to dust accumulation on the surface after long-term use. The actual performance change of the heat exchanger in the actual use process cannot depend on the performance detection of a new heat exchanger, but the performance attenuation degree of the heat exchanger after long-term use needs to be detected, and the detection needs to be completed in a short time. In order to meet the requirement of rapidly detecting the performance attenuation degree of a new heat exchanger after long-term use, a practical heat exchanger dust accumulation acceleration test method needs to be provided, and a possible basic technical route is that a high-concentration dust-containing environment with dust concentration thousands of times of that of the natural environment is created, and the heat exchanger is operated for a plurality of hours in the dust-containing environment to simulate the dust accumulation condition after being used for a plurality of years in the natural environment.
In order to ensure that the performance attenuation test result of the heat exchanger after accelerated dust deposition has repeatability, the uniformity and stability of the dust concentration in the dust-containing airflow is critical, and the dust-containing airflow blowing to the surface of the heat exchanger must meet two conditions: 1) the dust concentration in the dusty airflow at the windward side of the heat exchanger is kept uniform in each area of the surface of the heat exchanger; 2) the dust concentration in the dusty airflow at the windward side of the heat exchanger is kept stable in the whole period of the accelerated dust deposition test. The problem that the high-concentration dust-containing environment is easy to generate is that dust particles suspended in the air gradually sink under the action of gravity, and the dust concentration along the gravity direction is subjected to increasing distribution, so that the dust concentration in each area of the windward side of the heat exchanger is uneven; and along with the progress of the process of accelerating dust deposition, dust can be deposited on the surface of the heat exchanger continuously, so that the dust concentration in the dust-containing air is reduced, and the dust concentration in the period of accelerating the dust deposition test is unstable.
Through the search of the existing documents and patents, the only accelerated dust accumulation test method for the air conditioner heat exchanger is specified by the technical requirement for long-acting energy-saving evaluation of the air conditioner (CQC9202-2012) issued by the China quality certification center in 5 months of 2012. The basic flow of the method for accelerating the dust deposition test is as follows: placing a heat exchanger sample piece into a test air channel, and continuously supplying dust by a feeder arranged at an air channel inlet; the dust scattered into the air duct passes through the heat exchanger sample piece along with the air flow in the air duct, part of the dust is deposited on the surface of the sample piece, and the rest of the dust is continuously discharged out of the air duct along with the air flow. This solution has the following drawbacks: in the accelerated dust deposition test process, only a given total dust amount is considered to be blown to the surface of the heat exchanger in a short time, and the uniformity and stability of the dust concentration in the dust-containing airflow blown to the surface of the heat exchanger are not considered, so that the repeatability of the performance attenuation test result of the heat exchanger subjected to accelerated dust deposition is reduced.
Therefore, those skilled in the art are dedicated to develop a heat exchanger accelerated dust deposition testing device capable of achieving uniform and stable dust concentration, and repeatability of performance attenuation testing results of the heat exchanger subjected to accelerated dust deposition is guaranteed by accurately controlling the dust concentration on the windward side of the heat exchanger.
Disclosure of Invention
In view of the above-mentioned drawbacks of the prior art, the present invention is directed to a method for maintaining a uniform and stable dust concentration in a dusty air flow blown onto a heat exchanger surface during an accelerated dust deposition test of an air heat exchanger.
In order to achieve the aim, the invention provides an accelerated dust accumulation testing device for an air conditioner heat exchanger, which is characterized by comprising a dust box, a dust feeder, a dust box fan, a hot air measuring channel, an air channel fan, an air channel turning plate, a motor, a dust concentration meter, a PLC (programmable logic controller) control device, a thermocouple, a pressure sensor, a data acquisition instrument, an electric heating rod and an air conditioner heat exchanger sample piece;
the top of the heat measuring air duct is provided with two openings; the motor is arranged at the position close to the inner sides of the two openings at the top of the heat measuring air duct; the dust box fan is arranged between the two motors at the top of the heat measuring air duct; the air conditioner heat exchanger sample piece is arranged in the heat measuring air duct; the dust concentration meter is positioned on the air inlet side of the air-conditioning heat exchanger sample piece; the air duct fan is positioned on the air outlet side of the air conditioner heat exchanger sample piece; the pressure sensor and the thermocouple are arranged between the air conditioner heat exchanger sample piece and the dust concentration meter; the pressure sensor and the thermocouple are arranged between the air conditioner heat exchanger sample piece and the air duct fan; the electric heating rod is arranged on the air inlet side of the heat measuring air duct;
the left side and the right side of the dust box are respectively provided with an opening, the heat measuring air duct just penetrates through the two openings, and the two openings at the top of the heat measuring air duct are positioned in the dust box; the top surface of the heat measuring air duct extends to two sides to form a horizontal partition plate, so that the upper part of the dust box is isolated; the dust feeder is arranged at the top of the dust box;
the input end of the PLC control device is connected with the dust concentration meter; the output end of the PLC control device is respectively connected with the motor, the dust feeder, the dust box fan and the air duct fan; the data acquisition instrument is connected with the thermocouple and the pressure sensor;
the air duct flap shaft is connected to the top opening of the heat measuring air duct and is controlled by the motor to rotate; when the air duct turning plate rotates to a horizontal state, the dust box and the hot air measuring duct are isolated from each other, and when the air duct turning plate rotates to a vertical state, the dust box and the hot air measuring duct are communicated with each other.
Further, the dust box is a box body with the size of a room; the hot air measuring channel is a cuboid channel with a square cross section, two openings at the top of the hot air measuring channel are rectangular, the openings are symmetrically distributed, and the opening area is two thirds of the sectional area of the hot air measuring channel.
Furthermore, the air duct turning plate is in a step shape, the cross section shape and the cross section area of the raised part of the step are consistent with the cross section shape and the cross section area of the top opening of the heat measuring air duct, and the cross section shape and the cross section area of the whole air duct turning plate are consistent with the cross section shape and the cross section area of the heat measuring air duct.
Further, the accelerated dust deposition testing device comprises three working modes: the device comprises a uniform dust-containing environment forming mode, a dust-containing air stable circulation flowing mode and a heat exchange performance testing mode.
Furthermore, under the mode of forming the uniform dust-containing environment, the two air duct turning plates are both set to be in a horizontal state, the two openings at the top of the heat measuring air duct are just sealed by the step bulges of the air duct turning plates, and the dust box is mutually isolated from the heat measuring air duct.
Furthermore, under the stable circulation flow mode of the dust-containing air, the two air duct turning plates are both set to be in a vertical state, the whole air duct turning plate just seals the left side and the right side of the heat measuring air duct, and the dust box is communicated with the heat measuring air duct.
Furthermore, under the heat exchange performance test mode, the two air duct turning plates are both set to be in a horizontal state, the two openings at the top of the heat measuring air duct are just sealed by the step bulges of the air duct turning plates, the dust box is isolated from the heat measuring air duct, and the heat measuring air duct is communicated with the external atmosphere.
Through the application of the three working modes, the problems of uneven dust concentration caused by the fact that dust particles sink under the action of gravity and reduced dust concentration caused by the fact that dust is continuously deposited on the surface of the heat exchanger can be solved, machine moving is not needed in the performance testing process of the heat exchanger, and the problem of reduced repeatability of testing results caused by the fact that dust deposited on the surface of the heat exchanger drops in the machine moving process is solved.
Technical effects
The conception, the specific structure and the technical effects of the present invention will be further described with reference to the accompanying drawings to fully understand the objects, the features and the effects of the present invention.
Drawings
FIG. 1 is an overall view of the present invention;
FIG. 2 is a cross-sectional view of the internal structure of the present invention;
FIG. 3 is a schematic illustration of the state of the process of creating a uniform dusty environment in a dust bin in one embodiment of the present invention;
FIG. 4 is a schematic illustration of a steady circular flow of a dusty gas stream between a dust bin and a hot air sensing duct in an embodiment of the present invention;
FIG. 5 is a schematic diagram illustrating a heat exchange performance test process performed by the external atmosphere blowing to the surface of the heat exchanger after dust deposition according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of the operational logic flow in one embodiment of the present invention;
FIG. 7 is a graph showing the change in dust concentration in one embodiment of the present invention.
Detailed Description
The technical contents of the preferred embodiments of the present invention will be more clearly and easily understood by referring to the drawings attached to the specification. The present invention may be embodied in many different forms of embodiments and the scope of the invention is not limited to the embodiments set forth herein.
In the drawings, structurally identical elements are represented by like reference numerals, and structurally or functionally similar elements are represented by like reference numerals throughout the several views. The size and thickness of each component shown in the drawings are arbitrarily illustrated, and the present invention is not limited to the size and thickness of each component. The thickness of the components may be exaggerated where appropriate in the figures to improve clarity.
The embodiment comprises a dust-containing gas flow mixing module, a dust concentration adjusting module and a heat exchange performance testing module, as shown in fig. 1 and fig. 2. The dust-containing airflow mixing module comprises a dust box 1, a dust feeder 2 and a dust box fan 4; the dust concentration adjusting module comprises a hot air measuring channel 3, an air channel turning plate 5, a motor 6, an air channel fan 7, a dust concentration meter 11 and a PLC (programmable logic controller) 14; the heat exchange performance testing module comprises an air conditioner heat exchanger sample piece 8, a pressure sensor 9, a thermocouple 10, an electric heating rod 12 and a data acquisition instrument 13.
In this embodiment, the dust box 1 has a volume of 10 cubic meters and a size of 2.5m long by 2m wide by 2m high by 2 m; the main body of the hot air measuring channel 3 is a rectangular channel with a square section, and the length is 4m, the width is 0.8m, and the height is 0.8 m; the top of the heat measuring air duct is provided with a rectangular opening, the size of the rectangular opening is 0.8m in length and 0.5m in width, the positions of the rectangular opening are symmetrically distributed, and the distance between the outer edges of the two openings is 2 m; the size of the step protrusion of the air duct turning plate 5 is 0.8m multiplied by 0.5m in width, and the size of the whole air duct turning plate is 0.8m multiplied by 0.8m in width.
In this example, the dust concentration was set to 120mg/m3The fluctuation range of the dust concentration is +/-20 mg/m3The dust deposition acceleration time is 8 hours.
The embodiment comprises the following three working modes during working:
(1) uniform dusty environment forming pattern
As shown in fig. 3, the PLC control device 14 controls the motor 6 to rotate, and rotates the air duct turning plate 5 to a horizontal state, so that the dust box is in a closed space; then, the PLC control device 14 controls the dust feeder 2 to slowly feed the dust with a total amount of 1.4 g into the dust box 1, and controls the dust box fan 4 to rotate, thereby forming a dust concentration of 140mg/m in the dust box3A uniform dusty environment.
(2) Stable circulation flow mode of dust-containing air
As shown in fig. 4, the PLC control device 14 controls the motor 6 to rotate, and rotates the air duct turning plate 5 from a horizontal state to a vertical state, so that the dust box and the 1-measurement hot air duct 3 are communicated with each other; the PLC control device 14 controls the air duct fan 7 to be opened, guides the dust-containing air flow in the dust box 1 to blow to the air conditioner heat exchanger sample piece 8, and enables the dust-containing air flow to circularly flow between the dust box 1 and the heat measuring air duct 3; the dust concentration meter 11 monitors the dust concentration of the air inlet side of the air-conditioning heat exchanger sample piece 8 in real time, transmits the dust concentration data to the PLC control device 14, and when the dust concentration is reduced to 100mg/m3When the concentration of the dust is stabilized at 120 + -20 mg/m, the PLC control device 14 controls the dust feeder 2 to add a small amount of dust into the dust box 13Within the range of (1); the whole stable circulating flow process of the dust-containing air lasts for 8 hours.
(3) Heat exchange Performance test mode
As shown in fig. 5, the PLC control device 14 controls the motor 6 to rotate, and rotates the air duct turning plate 5 from a vertical state to a horizontal state, so that the dust box 1 and the heat measuring air duct 3 are isolated from each other; the air duct fan 7 guides external air to sequentially flow through the electric heating rod 12 and the air conditioner heat exchanger sample piece 8; the pressure sensors 9 and the thermocouples 10 on two sides of the air conditioner heat exchanger sample piece 8 transmit the acquired air pressure and temperature data to the data acquisition instrument 13.
In this embodiment, the operation logic of the accelerated dust deposition test process performed by the air conditioner heat exchanger is shown in fig. 6.
In this embodiment, the dust concentration data of the air-conditioning heat exchanger sample piece on the air inlet side monitored by the dust concentration meter is shown in fig. 7. After the first dust adding, the dust concentration rises sharply; in the process of accelerating dust deposition, the dust concentration is reduced along with the dust consumption and is increased along with the dust supplement, so that a period is formed; the dust concentration fluctuation process in the whole accelerated dust deposition test consists of a plurality of periods.
The foregoing detailed description of the preferred embodiments of the invention has been presented. It should be understood that numerous modifications and variations could be devised by those skilled in the art in light of the present teachings without departing from the inventive concepts. Therefore, the technical solutions available to those skilled in the art through logic analysis, reasoning and limited experiments based on the prior art according to the concept of the present invention should be within the scope of protection defined by the claims.
Claims (7)
1. An accelerated dust accumulation testing device for an air conditioner heat exchanger is characterized by comprising a dust box, a dust feeder, a dust box fan, a hot air measuring channel, an air channel fan, an air channel turning plate, a motor, a dust concentration instrument, a PLC (programmable logic controller) control device, a thermocouple, a pressure sensor, a data acquisition instrument, an electric heating rod and an air conditioner heat exchanger sample piece;
the top of the heat measuring air duct is provided with two openings; the motor is arranged at the position close to the inner sides of the two openings at the top of the heat measuring air duct; the dust box fan is arranged between the two motors at the top of the heat measuring air duct; the air conditioner heat exchanger sample piece is arranged in the heat measuring air duct; the dust concentration meter is positioned on the air inlet side of the air-conditioning heat exchanger sample piece; the air duct fan is positioned on the air outlet side of the air conditioner heat exchanger sample piece; the pressure sensor and the thermocouple are arranged between the air conditioner heat exchanger sample piece and the dust concentration meter; the pressure sensor and the thermocouple are arranged between the air conditioner heat exchanger sample piece and the air duct fan; the electric heating rod is arranged on the air inlet side of the heat measuring air duct;
the left side and the right side of the dust box are respectively provided with an opening, the heat measuring air duct just penetrates through the two openings, and the two openings at the top of the heat measuring air duct are positioned in the dust box; the top surface of the heat measuring air duct extends to two sides to form a horizontal partition plate, so that the upper part of the dust box is isolated; the dust feeder is arranged at the top of the dust box;
the input end of the PLC control device is connected with the dust concentration meter; the output end of the PLC control device is respectively connected with the motor, the dust feeder, the dust box fan and the air duct fan; the data acquisition instrument is connected with the thermocouple and the pressure sensor;
the air duct flap shaft is connected to the top opening of the heat measuring air duct and is controlled by the motor to rotate; when the air duct turning plate rotates to a horizontal state, the dust box and the hot air measuring duct are isolated from each other, and when the air duct turning plate rotates to a vertical state, the dust box and the hot air measuring duct are communicated with each other.
2. The accelerated dust deposition test device of the heat exchanger of the air conditioner as claimed in claim 1, wherein the dust box is a room-sized box body; the hot air measuring channel is a cuboid channel with a square cross section, two openings at the top of the hot air measuring channel are rectangular, the openings are symmetrically distributed, and the opening area is two thirds of the sectional area of the hot air measuring channel.
3. The accelerated dust deposition testing device of the heat exchanger of the air conditioner as recited in claim 1, wherein the shape of the air duct flap is a step shape, the cross-sectional shape and the cross-sectional area of the raised part of the step are consistent with the cross-sectional shape and the cross-sectional area of the top opening of the heat measuring air duct, and the cross-sectional shape and the cross-sectional area of the whole air duct flap are consistent with the cross-sectional shape and the cross-sectional area of the heat measuring air duct.
4. The accelerated dust deposition test device of the heat exchanger of the air conditioner as claimed in claim 1, wherein the accelerated dust deposition test device comprises three operation modes: the device comprises a uniform dust-containing environment forming mode, a dust-containing air stable circulation flowing mode and a heat exchange performance testing mode.
5. The accelerated dust deposition testing device of the heat exchanger of the air conditioner as claimed in claim 4, wherein in the uniform dust environment forming mode, both of the air duct turning plates are set to be in a horizontal state, and the step protrusion of the air duct turning plate just seals the two openings at the top of the heat measuring air duct, and the dust box is isolated from the heat measuring air duct.
6. The accelerated dust deposition testing device of the heat exchanger of the air conditioner as claimed in claim 4, wherein in the stable circulation flow mode of the dust-containing air, both of the two air duct turning plates are set to be vertical, and the whole air duct turning plate just seals the left and right sides of the heat measuring air duct, and the dust box is communicated with the heat measuring air duct.
7. The accelerated dust deposition testing device of the heat exchanger of the air conditioner as claimed in claim 4, wherein in the heat exchange performance testing mode, both of the two air duct turning plates are set to be horizontal, and the step protrusion of the air duct turning plate just seals the two openings at the top of the heat measuring air duct, the dust box is isolated from the heat measuring air duct, and the heat measuring air duct is communicated with the outside atmosphere.
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| CN112781892B (en) * | 2021-01-04 | 2022-06-07 | 重庆长安汽车股份有限公司 | Method for verifying vehicle dynamic performance and air conditioner performance attenuation under simulated dust environment |
| TWI819472B (en) * | 2022-01-21 | 2023-10-21 | 桓達科技股份有限公司 | Dust concentration meter calibration system |
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