CN1296690C - Method of shortening reliability test time of refrigerating and warming air conditioner - Google Patents

Abstract

The present invention relates to a method for testing the reliability of an air conditioner. The method for shortening reliability test time of a refrigerating and warming air conditioner is disclosed and comprises the procedures as follows: the temperature control of the air conditioner is arranged at a high-temperature shift, and the air conditioner is in a long-time operating state; an indoor machine of the air conditioner is arranged in a heat preservation box; the air-conditioner continuously operates in a high-temperature environment; operating voltage which is lower then rated working voltage is provided for the air conditioner, the indoor machine and an outdoor machine are arranged in environmental temperature of 24 DEG C to 43 DEG C; after the continuous operation is more than 100 hours, the states of the indoor machine and the outdoor machine are converted into normal operating states, and thus, the test is over. The test method of the present invention accelerates the exposure of potential malfunctions of the air conditioner under severe conditions, raises the operating reliability of the air conditioner and shortens the period of product launch. The method is suitable for testing the reliability of various refrigerating air conditioners and frequency-changing air conditioners.

Description

The Method of Shortening the Reliability Test Time of Cooling and Heating Air Conditioner

technical field

The invention relates to an air conditioner reliability detection technology, in particular to a method capable of shortening the reliability test time of a heating and cooling air conditioner.

Background technique

In the prior art, how to not repair or less repair within the design life of household electrical appliances is an important parameter reflecting product quality and management level, and is also an important factor for future competition among manufacturers. Manufacturers can always remain invincible in the fierce market competition only by discovering potential faults of air conditioners and improving product reliability through fast, accurate, effective and economical accelerated reliability test methods.

At present, the traditional reliability test method is usually to find problems by taking 30-60 heating and cooling air conditioners and conducting continuous operation tests for 6 months at room temperature. The disadvantages of this method are: the test site is large, the investment in power and human resources is large, the test period is long, and the problems that can be found are limited. Due to the long test period, often at the end of the reliability test, some products with a short market life have missed the golden season of sales. Because this test method is relatively simple, it is difficult to verify the function and reliability of some air conditioners under special operating conditions.

Another disadvantage of conducting reliability tests at room temperature is that when the ambient temperature is higher than 32°C, the heating reliability test cannot be performed. Heating at a lower ambient temperature cannot fully verify the reliability of the rotating parts of the indoor unit working in a high temperature environment for a long time.

There is also a method of reliability testing, which is to build a library that can generate a high-temperature environment. However, to conduct a reliability test in the test library, not only the investment in building the library is relatively large, but the power consumption of the library itself is also large, and the test period Same as the first method, the items to be tested are limited, and the test cost is high. In this test method, due to the influence of the size of the storage, the number of air conditioners that can be tested is extremely limited.

Contents of the invention

The technical problem to be solved by the present invention is to provide a method that can shorten the reliability test time of the heating and cooling air conditioner when it works in a high temperature environment. While shortening the test time, it can also speed up the exposure of the relevant components in the air conditioner Potential faults, more and wider reliability test items, can shorten test time, reduce test cost, and enable products to be put on the market as soon as possible.

The technical solution provided by the present invention is to construct a method for shortening the air conditioner reliability test time, which is characterized in that it comprises the following steps:

Set the temperature adjustment of the air conditioner to high temperature, and set the air supply mode to strong wind and wind direction swing mode, so that the air conditioner is in a long-term running state;

Place the indoor unit of the air conditioner in the insulation box; make the air conditioner work continuously in high temperature environment;

Provide the air conditioner with an operating voltage lower than the rated operating voltage, start the air conditioner, and make the indoor unit run in a high temperature environment for no less than 100 hours;

Then put the indoor and outdoor units at the ambient temperature of 24°C-43°C, and after continuous operation for no less than 100 hours, transfer to the normal operating state and end the test.

In the method for shortening the reliability test time of heating and cooling air conditioners according to the above method provided by the present invention, in the step of setting the temperature adjustment of the air conditioner at a high temperature gear and keeping the air conditioner in a long-term running state, the temperature of the air conditioner is set to The gear is set at 32°C, so that the temperature sensing control device of the indoor unit is in an open circuit state, so that after the air conditioner is started, the air conditioner can continue to heat for a long time without interruption.

In the method for shortening the reliability test time of the air conditioner according to the present invention, it is characterized in that the step of placing the indoor unit of the air conditioner in the heat preservation box; making the air conditioner work continuously in a high temperature environment is Putting the indoor unit of the air conditioner in a thermal insulation box slightly larger than the indoor unit can make the air conditioner work at an ambient temperature of about 53°C, and set a temperature detection point at an appropriate position in the box.

In the method for shortening the reliability test time of the air conditioner according to the present invention, it is characterized in that, in the step of providing the air conditioner with an operating voltage lower than the rated operating voltage, it is to provide the air conditioner with an operating voltage lower than the rated operating voltage 15 % of operating voltage.

In the method for shortening the reliability test time of the air conditioner according to the present invention, it is characterized in that, in the step of opening the temperature sensing control device of the indoor unit, the temperature sensing thermistor in the indoor unit is opened.

Implement the reliability test method provided by the present invention, by taking measures such as reducing the operating voltage, opening the temperature sensing device, and making the air conditioner work in a high-temperature environment, the potential faults in the exposed air conditioner can be accelerated, thereby shortening the test time; reducing the test cost , compared with the traditional test method, it has the advantages of not needing to build a low-temperature storage body, not limited by the number of tests and sites, low cost, and easy to carry out. Using this accelerated test method can greatly shorten the test time and reduce the number of air conditioners. The number of tests can be increased, the test efficiency can be improved, and the cost of the test can be reduced. Moreover, when the operating voltage is lower than the rated operating voltage, the relevant components in the air conditioner can be exposed to potential failures under harsh working conditions at an accelerated rate, which has great impact on the quality and reliability of the heating and cooling air conditioner. The improvement of sex has played a great role.

Detailed ways

The test method provided by the present invention is carried out based on the following principles. After research, it is found that the relationship between the life and temperature of the air conditioner refrigeration system and electrical components meets the Arrhenius equation: t=Ae ^ΔE/(KT) , where A is a constant, ΔE is the activation energy of the failure mechanism, which is the energy to move from the normal state to the degraded state, T is the thermodynamic temperature, and K is the Boltzmann constant. It can be known from the equation that the higher the system temperature and the ambient temperature, the shorter its service life, Raising the ambient temperature can speed up the life test; another principle is that, after research, it is found that the life of the refrigeration system of the air conditioner and the circuit components conforms to the inverse power law t=1/dpc, d is a constant, c is a constant related to temperature, p are parameters related to pressure, load and voltage. At higher system temperature and ambient temperature, the pressure in the compressor and piping system is much higher than normal temperature, and the load on the compressor is also much larger. At the same time, for air conditioners with pressure protection, frequent over Pressure protection test, therefore, at relatively high system and ambient temperature, accelerated tests can be carried out on the ability of the air conditioner system to withstand pressure and load;

According to the above-mentioned principle, the present invention provides the following test steps to shorten the test time. First, the temperature-sensitive control device in the indoor unit is opened (the temperature-sensitive thermistor is opened); The temperature is always at a very low temperature (the change of the ambient temperature cannot be detected, and the control system keeps the air conditioner in a heating state); and the temperature control gear of the air conditioner is set to a high temperature gear, usually 32°C, so that the air conditioner Turn on and run continuously in the "heating" mode; no matter how high the ambient temperature of the indoor unit is, the air conditioner can perform "heating" operation for a long time, and set the air supply mode to: strong wind, wind direction swing working status;

Then cover the indoor unit with a slightly larger box of the indoor unit. This box is made of heat-insulating materials, so that the indoor unit can continuously work at an ambient temperature of about 53°C when the air conditioner is running. It can fully test the reliability of each component of the indoor unit working under high temperature conditions for a long time, and can also set a temperature detection point at an appropriate position of the box to know the ambient temperature of the indoor unit;

To provide the air conditioner with an operating voltage lower than the rated operating voltage, generally 85% of the rated operating voltage is used to supply power to the air conditioner. For an air conditioner with a rated operating voltage of 220 volts, it is equivalent to providing an operating voltage of 187 volts. The purpose is that when the air conditioner is in heating operation, its operating current is greater than that in cooling operation. When the power supply voltage is reduced, the compressor must increase the current to maintain its output power. The larger the operating current of the compressor, It will cause the temperature of the compressor wire package to rise. Due to the heating at a relatively high ambient temperature (about 53°C), the temperature of the refrigerant in the system is also high, so that the compressor system has been operating at a relatively high temperature. The frequent operation of the air conditioner system in the overheating protection operation state can speed up the exposure of potential failures of the air conditioner under severe operating conditions. The operating time of this test step is not less than 100 hours.

Place the indoor and outdoor units at the same ambient temperature of 24°C-43°C, supply power with 85% of the rated voltage, and run continuously for no less than 100 hours;

During the above test period, the air conditioner should not have shell deformation, component failure, etc. The overheat protection shutdown of the compressor should be less than 40 minutes. After the test, the air conditioner should be restored to normal operation, and all functions of the air conditioner should be normal. The safety parameters should meet the requirements of the national standard, and the test is over.

When conducting reliability tests on air conditioners, it can also be tested in combination with other accelerated reliability test items, so as to achieve the purpose of improving test efficiency.

Compared with the reliability test method of common heating and cooling air conditioners, the test method provided by the present invention has the following advantages:

Since the temperature sensing device of the indoor unit (usually a thermistor) is opened, the heating test can be carried out when the indoor temperature is lower than 32°C.

During the test, the indoor unit can work for a long time at an ambient temperature of about 53°C (in the heat preservation box), and the shell and rotating parts of the indoor unit can be continuously operated to fully test that the components of the indoor unit can work for a long time. Under high temperature conditions, the reliability test of each component of the indoor unit during heating operation can be accelerated.

When the compressor is running at a lower than rated operating voltage, the operating current will increase, and the larger operating current will cause the temperature of the compressor coil to rise. Due to heating at a higher ambient temperature (about 53°C), The temperature of the refrigerant in the system is high, so that the compressor system is always at a high temperature, and the compressor system frequently works in the overheating protection state, which can accelerate the exposure of potential failures of the air conditioner under harsh operating conditions.

The high temperature of the compressor system can accelerate the cracking and carbon formation of the refrigeration oil, and accelerate the chemical reaction between the water in the refrigeration oil, the air and the compressor components, so that the mechanical lubricating oil can be quickly affected, and the friction of the compressor can be accelerated Loss, to accelerate exposure to potential failures of the air conditioner under harsh conditions of use.

For inverter air conditioners, when the low-voltage heating operation, the current is large, which can make the temperature of the inverter module higher. In addition, when the system ambient temperature is high, the temperature rise of the inverter module is large, which can accelerate the exposure of the inverter. potential failure.

In the test, a large accelerated stress (referring to the test conditions that can shorten the fault exposure time of the air conditioner test, such as: pressure, temperature, voltage, current, etc., is a kind of failure activation energy), makes the fault exposure time long be shortened, therefore, only need a small amount of test rigs to include under general stress conditions, the fault that needs more test rigs to be exposed in the regular test period, so, the present invention can greatly reduce the test quantity of air conditioner, The test time is reduced and the test cost is reduced.

Under lower power supply voltage, the operating current of motors such as indoor fan motors, indoor AC wind direction motors, and outdoor fan motors will increase, which will increase the heat generation of the coils, which can accelerate the exposure of potential failures of motors and fan components.

The reliability test method of the present invention does not need to build a high-temperature storehouse, and is not limited by the number of tests and the site, and has low cost and is easy to carry out. Adopting this accelerated test method not only shortens the test time (the required test time is only conventional). One-tenth of the test time), reducing the number of tests, improving the test efficiency, reducing the test cost, and accelerating the exposure of potential faults of the air conditioner under harsh conditions, which plays a significant role in improving the quality and reliability of the air conditioner To a great effect, shortening the cycle of products on the market.

Claims (3)

1, a method for shortening the reliability test time of heating and cooling air conditioners, is characterized in that, comprises the following steps: Keep the temperature sensing control device of the indoor unit in the open circuit state, set the temperature adjustment of the air conditioner to a high temperature setting of 32°C, and set the air supply mode to strong wind and wind direction swing mode, so that the air conditioner is in the heating operation state; Place the indoor unit of the air conditioner in the insulation box; Provide the air conditioner with an operating voltage 15% lower than the rated operating voltage, start the air conditioner, and make the indoor unit run continuously for at least 100 hours at an environment of about 53°C; Then place the indoor and outdoor units at the ambient temperature of 24°C-43°C, provide operating voltage at 85% of the rated operating voltage, and switch to normal operating state after continuous operation for no less than 100 hours to end the test. 2. The method for shortening the reliability test time of the air conditioner according to claim 1, characterized in that, placing the indoor unit of the air conditioner in the heat preservation box is to place the indoor unit of the air conditioner in a room slightly smaller in volume than the indoor unit. In a larger thermal insulation box, the air conditioner can be operated at an ambient temperature of about 53°C. 3. The method for shortening the reliability test time of the air conditioner according to claim 2, wherein said making the temperature-sensing control device of the indoor unit in an open circuit state is to open the temperature-sensing thermistor in the indoor unit.