CN212844395U - Online performance detection tool for air conditioner - Google Patents
Online performance detection tool for air conditioner Download PDFInfo
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- CN212844395U CN212844395U CN202021821178.XU CN202021821178U CN212844395U CN 212844395 U CN212844395 U CN 212844395U CN 202021821178 U CN202021821178 U CN 202021821178U CN 212844395 U CN212844395 U CN 212844395U
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Abstract
The invention provides an air conditioner online performance detection tool which comprises a cabinet, an air conditioner installation part, a circulating fan, a heater, a guide plate, an air supply temperature sensor, an air return temperature sensor and a controller, wherein the cabinet comprises a lower space and an upper space above the lower space; under circulating fan's air supply effect, the air current of air supply intercommunication mouth is through the heater and heated in the lower part space of rack, and then upwards walks through the guide plate, and then the upper portion space and the return air intercommunication mouth through the rack. The air conditioner online performance detection tool has the following advantages: the on-line performance tool of the air conditioner can accurately judge the fault abnormality and the performance abnormality of the product before leaving the factory, reduce the after-sale treatment cost of the product and the customer complaint rate, and improve the customer satisfaction. The detection tool can be designed to be movable and fixed according to the size of the product, and is convenient to use.
Description
Technical Field
The invention relates to the technical field of air conditioner performance detection, in particular to an air conditioner online performance detection tool.
Background
The cabinet air conditioner is widely applied to a base station cabinet and an industrial power cabinet and is used for controlling the temperature of a server and an electric element in the cabinet. Due to the limitation of the size of the used space of the cabinet air conditioner, the internal design of the cabinet air conditioner is compact, all parts of a refrigerating system are completely welded in a closed mode, if the abnormal condition of product performance is found when the cabinet air conditioner is used, the product is difficult to maintain and overhaul on site, and the whole machine replacement mode is generally adopted. Especially for the application of base station cabinets in remote zones, if abnormal product performance occurs, the after-sales is difficult and the after-sales cost is high. Meanwhile, no on-line performance detection method and equipment special for products are established in the air conditioner product manufacturers in the industry, so that the product performance is lack of detection and judgment in the production process, namely the quality of the product cannot be judged. With the improvement of the product quality requirement of a customer, the online performance detection of the product becomes an indispensable detection item in the production process of the product, so that an online performance detection tool and a detection method of an air conditioner are needed, the quality of the product before leaving a factory is accurately judged, the customer satisfaction is improved, and the product quality failure rate and the complaint rate are reduced.
Disclosure of Invention
The invention aims to solve the technical problem of providing an air conditioner online performance detection tool aiming at the defects in the related art.
The technical scheme adopted by the invention for solving the technical problem comprises the following steps: construct an air conditioner on-line performance detection frock, include:
a cabinet having a lower space and an upper space above the lower space inside;
the air conditioner installation part is used for being connected with an air conditioner and is arranged on one side of the cabinet, an air supply communication port and an air return communication port are arranged on the air conditioner installation part and are communicated with the inside and the outside of the cabinet, the air supply communication port is communicated with the lower space of the cabinet, and the air return communication port is communicated with the upper space of the cabinet;
the circulating fan is arranged in the lower space of the cabinet and used for transversely supplying air, and the air draft direction of the circulating fan faces the air supply communication port;
the heater is arranged on the air outlet side of the circulating fan;
the guide plate is arranged on the air outlet side of the circulating fan, the heater is arranged between the circulating fan and the guide plate, and the guide plate is obliquely arranged towards the circulating fan so as to guide the airflow sent out by the circulating fan upwards;
the air supply temperature sensor is arranged at the air supply communication port to detect the temperature of air flow at the air supply communication port;
the return air temperature sensor is arranged at the outlet of the return air communicating opening to detect the temperature of the air flow at the return air communicating opening;
the controller is arranged on the machine cabinet, is electrically connected with the air supply temperature sensor and the air return temperature sensor and is used for receiving information of the air supply temperature sensor and the air return temperature sensor;
and under the air supply action of the circulating fan, the air flow of the air supply communication port passes through the heater and is heated in the lower space of the cabinet, then passes through the guide plate and upwards goes, and then passes through the upper space of the cabinet and the return air communication port.
Preferably, the air conditioner installation part is a side plate body of the cabinet.
Preferably, the air supply communication port and the return air communication port are communicated with each other.
Preferably, the air conditioner mounting part is detachably connected to the cabinet.
Preferably, the online performance of air conditioner detects frock includes vertically to be established heater support in the rack, the heater is established on the heater support, the heater support is ventilated to the air feed stream passes through.
Preferably, the lower end of the heater bracket is connected with the bottom surface of the cabinet, and the upper end of the heater bracket is connected with the top surface of the cabinet.
Preferably, the on-line performance detection tool for the air conditioner comprises a monitoring screen electrically connected with the controller, so that information monitored by the air supply temperature sensor and the air return temperature sensor is displayed on the monitoring screen.
The technical scheme of the invention at least has the following beneficial effects: the air conditioner online performance detection tool has the following advantages: the on-line performance tool of the air conditioner can accurately judge the fault abnormality and the performance abnormality of the product before leaving the factory, reduce the after-sale treatment cost of the product and the customer complaint rate, and improve the customer satisfaction. The detection tool can be designed to be movable and fixed according to the size of the product, and is convenient to use.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
fig. 1 is a side view of an air conditioner online performance detection tool according to an embodiment of the present invention.
Fig. 2 is a front view of the air conditioner online performance detection tool of fig. 1.
Fig. 3 is a schematic view of an internal structure of the on-line performance testing tool for the air conditioner of fig. 1 (in a state where the air conditioner is not installed).
Fig. 4 is a schematic view of an internal structure of the on-line performance detecting tool of the air conditioner of fig. 1 (in a state where the air conditioner is installed).
Fig. 5 is a side view of an air conditioner online performance detection tool according to another embodiment of the present invention (in a state where the air conditioner is installed).
Fig. 6 is a rear view of the air conditioner installed in fig. 4.
Fig. 7 is a control diagram of an air conditioner online performance detection method according to an embodiment of the present invention.
Fig. 8 is a flowchart of an air conditioner online performance detection method according to an embodiment of the present invention.
The reference numerals in the figures denote: the online performance detection tool for the air conditioner comprises an air conditioner online performance detection tool 1, a monitoring screen 101, an operation window 102, a cabinet 103, an upper space 103a, a lower space 103b, a return air communication port 103c, an air supply communication port 103d, an air conditioner installation part 104, a movable universal wheel 105, an electric heating fixing support 201, a heater support 201, an upper baffle 202, a front baffle 203, a status indicator lamp 204, a return air temperature sensor 301, an air supply temperature sensor 302, a controller 303, a guide plate 304, a heater 305, a circulating fan 306, the air conditioner 401, a movable support 501, an air inlet 601, an air outlet 602 and a power supply terminal 603.
Detailed Description
For a more clear understanding of the technical features, objects and effects of the present invention, embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be understood that if the terms "front", "back", "upper", "lower", "left", "right", "longitudinal", "lateral", "vertical", "horizontal", "top", "bottom", "inner", "outer", "head", "tail", etc. are used herein to indicate an orientation or positional relationship, they are constructed and operated in a specific orientation based on the orientation or positional relationship shown in the drawings, which is for convenience of describing the present invention, and do not indicate that the device or component being referred to must have a specific orientation, and thus, should not be construed as limiting the present invention. It is also to be understood that, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," "disposed," and the like, if used herein, are intended to be inclusive, e.g., that they may be fixedly connected, detachably connected, or integrally formed; either directly or indirectly through intervening media, either internally or in any other relationship. When an element is referred to as being "on" or "under" another element, it can be "directly" or "indirectly" on the other element or intervening elements may also be present. If the terms "first", "second", "third", etc. are used herein only for convenience in describing the present technical solution, they are not to be taken as indicating or implying relative importance or implicitly indicating the number of technical features indicated, whereby the features defined as "first", "second", "third", etc. may explicitly or implicitly include one or more of such features. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the following description, for purposes of explanation and not limitation, specific details are set forth, such as particular system structures, techniques, etc. in order to provide a thorough understanding of the embodiments of the invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.
Referring to fig. 1 to 6, an air conditioner online performance detection tool 1 according to an embodiment of the present invention includes:
a cabinet 103, the interior of the cabinet 103 including a lower space 103b and an upper space 103a above the lower space 103 b; an operation window 102 is arranged on the side surface of the cabinet 103 so as to observe the condition in the cabinet 103 through the operation window 102; the bottom of the cabinet 103 is provided with a movable universal wheel 105 or a movable bracket 501 according to the size of a detected product; in the production process of the air conditioner 401, the mounting panel of the corresponding air conditioner 401 can be replaced according to different capacities of the air conditioner 401 or the movable universal wheels 105 or the movable support 501 can be replaced at the bottom of the cabinet 103 when the large-size air conditioner 401 is detected.
An air conditioner mounting part 104 for connecting with an air conditioner 401, which is arranged at one side of the cabinet 103, is provided with an air supply communicating port 103d and an air return communicating port 103c for communicating the inside and the outside of the cabinet 103, and is used for exchanging air flow with the inside of the cabinet 103 after the air conditioner 401 is connected with the air conditioner mounting part 104; the air supply communication port 103d communicates with the lower space 103b of the cabinet 103, the return air communication port 103c communicates with the upper space 103a of the cabinet 103, and the return air communication port 103c is above the air supply communication port 103 d; in the embodiment of fig. 1-6, the air conditioner mounting portion 104 is an air conditioner 401 mounting panel, and has a plate shape, on which the air conditioner 401 can be mounted and fixed, and the supply air communication port 103d and the return air communication port 103c are two parts of a large opening on the air conditioner 401 mounting panel;
the circulating fan 306 is arranged in the lower space 103b of the cabinet 103 and is positioned at the bottom of the cabinet 103, air is transversely supplied to the circulating fan 306 backwards, the air draft direction of the circulating fan 306 faces the air supply communication port 103d, in order to prevent an operator in the detection process from supplying power to the air conditioner 401 through the performance detection device operation window 102, a front baffle 203 is arranged on the air draft side of the circulating fan 306, a grid is arranged on the front baffle 203 to allow airflow of the air supply communication port 103d to pass through, an upper baffle 202 is arranged at the top of the circulating fan 306, and the upper baffle 202 defines the lower space 103b and the upper space 103a of the cabinet 103;
a heater 305, preferably a PTC electric heater 305, provided on the air outlet side of the circulation fan 306; the heaters 305 may be provided in a single group or in plural groups, and when provided in plural groups, the number is at least two;
a guide plate 304 arranged at the air outlet side of the circulating fan 306, the heater 305 is arranged between the circulating fan 306 and the guide plate 304, and the guide plate 304 is obliquely arranged towards the circulating fan 306 so as to guide the air flow sent by the circulating fan 306 upwards;
an air supply temperature sensor 302 provided at the air supply communication port 103d to detect the temperature of the air flow at the air supply communication port 103 d;
the return air temperature sensor 301 is arranged at the outlet of the return air communicating opening 103c to detect the temperature of the airflow at the return air communicating opening 103 c; the return air temperature sensor 301 and the supply air temperature sensor 302 are arranged on the air conditioner 401 butt joint side of the air conditioner mounting part 104, that is, the supply air temperature sensor 302 is fixed on the front baffle 203 close to the air outlet 602 side of the air conditioner 401, and the return air temperature sensor 301 is fixed on the air conditioner 401 mounting panel close to the air inlet 601 side of the air conditioner 401;
the controller 303 is arranged on the cabinet 103, is electrically connected with the air supply temperature sensor 302 and the air return temperature sensor 301, and is used for receiving information of the air supply temperature sensor 302 and the air return temperature sensor 301;
the air flow of the air supply communication port 103d is heated by the heater 305 in the lower space 103b of the cabinet 103 by the air supply of the circulation fan 306, and then goes upward through the baffle plate 304, and further passes through the upper space 103a of the cabinet 103 and the return air communication port 103 c.
When the on-line performance detection tool 1 of the air conditioner is used, the air conditioner 401 is installed on an air conditioner installation part, an air outlet 602 of the air conditioner 401 is aligned with an air supply communication port 103d of the cabinet 103, an air inlet 601 of the air conditioner 401 is aligned with an air return communication port 103c of the cabinet 103, and then the air conditioner 401 can be detected.
The air conditioner online performance detection tool 1 can accurately judge the fault abnormality and the performance abnormality of the product before leaving the factory, reduce the after-sale processing cost of the product and the customer complaint rate, and improve the customer satisfaction.
The air conditioner mounting portion 104 is a side plate body of the cabinet 103.
The air supply communication port 103d and the return air communication port 103c communicate with each other, and in the embodiment of fig. 1 to 6, the air supply communication port 103d and the return air communication port 103c are integrally opened in the air conditioner mounting portion 104, and the air conditioner mounting portion 104 is a frame-shaped plate body.
The air conditioner mounting part 104 is detachably connected with the cabinet 103 so as to replace the air conditioner mounting part 104 matched with the size of the air conditioner 401 when the air conditioner 401 with different specifications needs to be detected.
The on-line performance detection tool 1 for the air conditioner comprises a heater support 201 longitudinally arranged in a cabinet 103, a heater 305 is arranged on the heater support 201, and the heater support 201 is in a grid shape and is ventilated so as to allow air to pass through.
The lower end of the heater bracket 201 is connected with the bottom surface of the cabinet 103, and the upper end is connected with the top surface of the cabinet 103.
The on-line performance detection tool 1 of the air conditioner comprises a monitoring screen 101 and a status indicator lamp 204 which are arranged on a cabinet 103 and electrically connected with a controller 303, information monitored by an air supply temperature sensor 302 and an air return temperature sensor 301 is displayed on the monitoring screen 101, and a result detected by the air conditioner 401 is represented by the status indicator lamp 204, so that the return air temperature value, the air supply temperature value and the current value of the air conditioner 401 can be checked by the monitoring screen 101, and the performance of the product is judged to be good or bad by the status indicator lamp 204.
The invention provides an air conditioner online performance detection method, which comprises the following steps:
s01: providing an air conditioner 401, providing the air conditioner online performance detection tool 1, starting the air conditioner 401, mounting the air conditioner 401 on an air conditioner mounting portion 104, aligning an air outlet 602 of the air conditioner 401 with an air supply communication port 103d of a cabinet 103, aligning an air inlet 601 of the air conditioner 401 with an air return communication port 103c of the cabinet 103, supplying power to a power supply terminal 603 of the air conditioner 401 from a controller 303 of the cabinet 103 through an operation window 102, so that the controller 303 is electrically connected with the air conditioner 401 and supplies power to the air conditioner 401, and detecting an air return temperature value of the air conditioner 401;
s02: turning on the heater 305 and the circulation fan 306;
s03: the controller 303 acquires a parameter value of the return air temperature sensor 301 to obtain a return air temperature value, acquires a parameter value of the supply air temperature sensor 302 to obtain a supply air temperature value, and acquires an operating current value of the air conditioner 401;
s04: the controller 303 compares the air supply temperature value and the return air temperature value with a standard preset value of the air conditioner 401 according to a ratio R between the return air temperature value and a refrigeration starting set value of the air conditioner 401, and determines the performance of the air conditioner 401 and whether the performance of the air conditioner is normal. The performance of the product is judged to be good or bad by judging the color of the indicator light, and meanwhile, the controller 303 transmits the return air temperature value, the air supply temperature value and the current value to the monitoring screen 101.
The number of the heaters 305 is at least two groups, the number of the heaters 305 activated in the step S02, that is, the electric heating power is consistent with the standard performance of the detected air conditioner 401, and the power sections of 300W, 500W and 1000W can be configured according to the performance capacity of the detected air conditioner 401.
The range of the standard preset value of the air conditioner 401 in S04 is determined according to the temperature value of the evaporation air-out side of the air conditioner 401 with different capacities and the operation current of the air conditioner 401.
In S02, after the air conditioner 401 is turned on, when the return air temperature value reaches the cooling start setting value of the air conditioner 401, the compressor of the air conditioner 401 is cooled and operated, and after the continuous operation time reaches 160 seconds, the operation proceeds to S03 and S04 for detection and judgment.
In S04, if the comparison result between the ratio R of the return air temperature value to the refrigeration start setting value of the air conditioner 401 and the standard preset value of the air conditioner 401 is that the ratio R is greater than or equal to +1 ℃ and less than 2 ℃, the performance of the air conditioner 401 is normal.
In S04, if the comparison result of the ratio a between the return air temperature value and the standard preset value of the air conditioner 401 is that the ratio a is not less than 1.02 and less than 0.95, the performance of the air conditioner 401 is normal.
Specifically, referring to fig. 7-8, in cooperation with the air conditioner online performance detection tool 1, the air conditioner 401 is correctly mounted on the air conditioner 401 mounting panel of the cabinet 103 by using the air conditioner 401 online performance detection method, the controller 303 supplies power to the air conditioner 401, the PTC electric heater 305 and the circulating fan 306 in the cabinet 103 are started, and the product online performance detection is performed. The air conditioner 401 starts a cycle, at the moment, the temperature of the return air temperature sensor 301 on the cabinet 103, which detects that the temperature in the cabinet 103 is consistent with the temperature of the air inlet 601 side of the air conditioner 401, the temperature in the cabinet 103 gradually rises along with the heating of the PTC electric heater 305, when the temperature of the air inlet 601 side of the air conditioner 401 reaches the set refrigeration starting temperature of the air conditioner 401, the compressor of the air conditioner 401 starts refrigeration, the air outlet 602 side of the air conditioner 401 generates cold energy, the air supply temperature sensor 302 detects the temperature at the air outlet 602 of the air conditioner 401, the refrigeration performance generated by the air conditioner 401 in the cabinet 103 and the heating power for starting the nominal PTC electric heater 305 are in thermal balance. After the compressor of the air conditioner 401 is started for refrigeration S, the controller 303 collects return air temperature sensor 301, supply air temperature sensor 302 and running current in the cabinet 103, compares the return air temperature sensor with a standard preset value for judgment, displays the judgment result through the status indicator lamp 204, and displays the current return air temperature value, the supply air temperature value and the return air temperature value of the air conditioner 401 on the monitoring screen 101. If the status indicator lamp 204 displays a green lamp, the online performance detection of the air conditioner 401 is qualified, if the status indicator lamp 204 displays a red lamp, the online performance detection of the air conditioner 401 is unqualified, and the synchronous status indicator lamp 204 gives an audible and visual alarm.
The detection method of the embodiment of the invention has the following judgment principle: setting air conditioner 401 evaporation side air outlet temperature values and air conditioner 401 running currents with different capacities in the controller 303, when the air conditioner is detected and judged to enter, acquiring an air return temperature value of an air return temperature sensor 301 by the controller 303, judging whether a ratio R of the air return temperature value to an air conditioner 401 refrigeration starting set value and a ratio R within a preset range of +1 ℃ and more than or equal to 2 ℃ by the controller 303, judging whether the ratio R meets the preset range, if so, transmitting a qualified signal to the status indicator lamp 204 by the controller 303, and displaying a green lamp by the status indicator lamp 204; if not, the controller 303 transmits the unqualified signal to the status indicator lamp 204, the status indicator lamp 204 displays a red light, and the synchronous status indicator lamp 204 gives an audible and visual alarm.
However, when the air conditioner 401 detects and judges, the controller 303 judges the return air temperature value of the air conditioner 401, the controller 303 collects the return air temperature value of the air conditioner 401, the ratio a of the return air temperature value to the standard preset value of the air conditioner 401 to the preset range of 1.02 is not more than 0.95, the judgment is carried out to judge whether the ratio a meets the preset range, if so, the controller 303 transmits a qualified signal to the status indicator lamp 204, and the status indicator lamp 204 displays a green light; if not, the controller 303 transmits the unqualified signal to the status indicator lamp 204, the status indicator lamp 204 displays a red light, and the synchronous status indicator lamp 204 gives an audible and visual alarm.
In summary, the air conditioner online performance detection tool 1 and the air conditioner 401 online performance detection method of the present invention have the following advantages: through the air conditioner 401 online performance tool and the detection method, the fault abnormality and the performance abnormality of the product before leaving the factory can be accurately judged, the after-sale treatment cost of the product and the customer complaint rate are reduced, and the customer satisfaction is improved. The detection tool can be designed to be movable and fixed according to the size of the product, and is convenient to use.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the present invention, as it will be apparent to those skilled in the art that various modifications, combinations and variations can be made in the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.
Claims (7)
1. The utility model provides an online performance of air conditioner detects frock (1), its characterized in that includes:
a cabinet (103), the cabinet (103) comprising a lower space (103b) and an upper space (103a) above the lower space (103b) inside;
the air conditioner installation part (104) is used for being connected with an air conditioner (401), is arranged on one side of the cabinet (103), is communicated with the inside and the outside of the cabinet (103) and is provided with an air supply communication port (103d) and an air return communication port (103c), the air supply communication port (103d) is communicated with the lower space (103b) of the cabinet (103), and the air return communication port (103c) is communicated with the upper space (103a) of the cabinet (103);
the circulating fan (306) is arranged in the lower space (103b) of the cabinet (103), air is transversely supplied by the circulating fan (306), and the air draft direction of the circulating fan (306) faces the air supply communication port (103 d);
a heater (305) provided on the air outlet side of the circulating fan (306);
a deflector (304) arranged on the air outlet side of the circulating fan (306), the heater (305) is arranged between the circulating fan (306) and the deflector (304), and the deflector (304) is obliquely arranged towards the circulating fan (306) so as to guide the air flow sent out by the circulating fan (306) upwards;
an air supply temperature sensor (302) provided at the air supply communication port (103d) to detect the temperature of the air flow at the air supply communication port (103 d);
the return air temperature sensor (301) is arranged at the outlet of the return air communicating opening (103c) to detect the temperature of the airflow at the return air communicating opening (103 c);
the controller (303) is arranged on the cabinet (103), is electrically connected with the air supply temperature sensor (302) and the air return temperature sensor (301), and is used for receiving information of the air supply temperature sensor (302) and the air return temperature sensor (301);
under the air supply action of the circulating fan (306), the air flow of the air supply communication port (103d) passes through the heater (305) and is heated in the lower space (103b) of the cabinet (103), then passes through the guide plate (304) and goes upwards, and then passes through the upper space (103a) of the cabinet (103) and the return air communication port (103 c).
2. The tool (1) for detecting the online performance of the air conditioner is characterized in that the air conditioner installation part (104) is a side plate body of the cabinet (103).
3. The on-line performance detection tool (1) for the air conditioner is characterized in that the air supply communication port (103d) and the return air communication port (103c) are communicated with each other.
4. The on-line performance detection tool (1) for the air conditioner is characterized in that the air conditioner installation part (104) is detachably connected with the cabinet (103).
5. The on-line air conditioner performance detection tool (1) as claimed in claim 1, wherein the on-line air conditioner performance detection tool (1) comprises a heater support (201) longitudinally arranged in the cabinet (103), the heater (305) is arranged on the heater support (201), and the heater support (201) is ventilated so as to allow air to pass through.
6. The on-line performance detection tool (1) for the air conditioner is characterized in that the lower end of the heater bracket (201) is connected with the bottom surface of the cabinet (103), and the upper end of the heater bracket is connected with the top surface of the cabinet (103).
7. The on-line air conditioner performance detection tool (1) as claimed in claim 1, wherein the on-line air conditioner performance detection tool (1) comprises a monitoring screen (101) electrically connected with the controller (303) so as to display information monitored by the supply air temperature sensor (302) and the return air temperature sensor (301) on the monitoring screen (101).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021821178.XU CN212844395U (en) | 2020-08-26 | 2020-08-26 | Online performance detection tool for air conditioner |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021821178.XU CN212844395U (en) | 2020-08-26 | 2020-08-26 | Online performance detection tool for air conditioner |
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| CN212844395U true CN212844395U (en) | 2021-03-30 |
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| CN202021821178.XU Active CN212844395U (en) | 2020-08-26 | 2020-08-26 | Online performance detection tool for air conditioner |
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