Judgment method for oil shortage of multi-connected unit
A judging method and oil-shortage technology, applied in measuring devices, instruments, etc., can solve problems such as burnout, oil-shortage dry friction of compressors, difficulty in distinguishing lubricating oil and refrigerant, etc., and achieve the goal of solving technical problems and making quick, convenient and accurate judgments Effect
Active Publication Date: 2015-07-01
NINGBO AUX ELECTRIC
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Problems solved by technology
Especially in the case of super long piping or a large drop between the internal and external units, if the lubricating oil in the system cannot meet the oil quantity required for the operation of the compressor, it will cause the compressor to lack oil and dry friction and eventually burn out
However, it is difficult to judge whether there is enough lubricating oil in the multi-unit unit, because the lubricating oil in the system cannot be seen or touched, and it is even more difficult to distinguish the lubricating oil and refrigerant mixed together. Therefore, objectively speaking, how to Judging whether there is a lack of lubricating oil in the multi-unit unit has always been a technical problem in the industry
Method used
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[0021] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.
[0022] like figure 1 As shown, the method for judging whether the multi-unit unit is short of oil in the present invention, the specific steps are as follows.
[0023] a. Install the second temperature sensor 2 at the outlet of the oil return solenoid valve 1 of each outdoor unit.
[0024] b. Close the oil return solenoid valve 1 and measure the temperature T on the second temperature sensor 2 at this moment 0 .
[0025] c. Start the compressor 4 of the outdoor unit and run it for 30 minutes, open the oil return solenoid valve 1, and measure the temperature T of the second temperature sensor 2 at this moment 0 '.
[0026] d. Calculate T 0 ’ minus T 0 The temperature difference ΔT.
[0027] e. If ΔT≥5°C, it is determined that there is no oil shortage; if ΔT≤3°C, it is determined that there is oil shortage; if 3°C<ΔT<5°C, continue to the n...
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The invention discloses a judgment method for oil shortage of a multi-connected unit. The judgment method includes a, mounting a second temperature sensor (2) at an outlet of an oil return electromagnetic valve (1) of an outdoor unit; b, closing the oil return electromagnetic valve (1), and measuring a temperature value T0 on the second temperature sensor (2) at the moment; c, starting a compressor (4) of the outdoor unit to enable the compressor to operate for 30 minutes, opening the oil return electromagnetic valve (1), and measuring a temperature value T0' on the second temperature sensor (2) at the moment; d, subtracting the T0 from the T0' to acquire a temperature difference delta T; e, if the delta T is larger than or equal to 5 DEG C, judging that oil shortage exists, if the delta T is smaller than or equal to 3 DEG C, judging that oil shortage does not exist, and if the delta T is larger than 3 DEG C but smaller than 5 DEG C, continuing to the next step; f, detecting an air exhaust port temperature Td on a first temperature sensor (3) at an outlet of the compressor (4), if the Td is larger than 98 DEG C, judging that oil shortage exists, and if the Td is smaller than or equal to 98 DEG C, judging that oil shortage does not exist. The method is rapid, convenient and accurate.
Description
technical field [0001] The invention relates to a multi-connected air conditioner unit, in particular to a method for judging whether the multi-connected unit is short of oil. Background technique [0002] The multi-connected air conditioner unit in the prior art is referred to as a multi-connected unit for short, and it includes an outdoor unit, a plurality of indoor units connected in parallel, and two refrigerant circulation main pipes connecting each indoor unit and outdoor unit. The outdoor unit communicates with multiple indoor units connected in parallel through two refrigerant circulation main pipes. [0003] Each outdoor unit includes a compressor, an oil separator, a four-way reversing valve, an outdoor heat exchanger (a condenser for cooling and an evaporator for heating) and a gas-liquid separator. The outlet of the compressor is connected with the inlet of the oil separator, the outlet of the oil separator is connected with the first valve port of the four-way ...
Claims
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IPC IPC(8): G01D21/00
Inventor 侯丽峰涂虬
Owner NINGBO AUX ELECTRIC