CN115615642A

CN115615642A - High-temperature cooling test method for portable compression type vehicle-mounted refrigerator

Info

Publication number: CN115615642A
Application number: CN202211121326.0A
Authority: CN
Inventors: 苏少锐; 揭辉霞; 蒋虹; 王素霞; 梁培炎; 李铁
Original assignee: Vkan Certification And Testing Co ltd
Current assignee: Vkan Certification And Testing Co ltd
Priority date: 2022-09-15
Filing date: 2022-09-15
Publication date: 2023-01-17

Abstract

The invention discloses a high-temperature cooling test method for a portable compression type vehicle-mounted refrigerator, which comprises the following steps of: a vibration table is adopted, and a closed test box is arranged above the vibration table; alternatively, a closed test chamber will be used, with the vibration table placed therein; placing a portable compression type vehicle-mounted refrigerator on a vibration table, placing the portable compression type vehicle-mounted refrigerator in a closed test box or a closed test chamber, and arranging a temperature sensor in the portable compression type vehicle-mounted refrigerator; and then carrying out a high-temperature cooling test, and recording the time from the start of the test to the set temperature. The invention effectively evaluates the refrigeration effect of the vehicle-mounted refrigerator by simulating the actual working environment of the vehicle-mounted refrigerator.

Description

High-temperature cooling test method for portable compression type vehicle-mounted refrigerator

Technical Field

The invention relates to a high-temperature cooling test method for a portable compression type vehicle-mounted refrigerator.

Background

The vehicle-mounted refrigerator is a refrigeration cabinet which can be carried on an automobile, is a continuation of a household refrigerator, and realizes that people can enjoy cold and fresh food at any time in the automobile traveling process. The conventional portable compression type vehicle-mounted refrigerator has high refrigeration efficiency, and a refrigeration system of the portable compression type vehicle-mounted refrigerator is composed of a compressor, a condenser, a dry filter, a capillary tube, an evaporator and the like.

In recent years, demands for personal leisure, tourism and the like are gradually increased, and particularly, the continuous growth of leisure culture markets such as peripheral tourism, camping and the like promotes the expansion of the demands for the vehicle-mounted refrigerator. With the continuous development of the vehicle-mounted refrigerator industry, more and more new technologies, new functions and new products appear, and as the product performance standard system of the vehicle-mounted refrigerator product is not perfect in China, the vehicle-mounted refrigerator product in the current market is not good and good, and consumers can hardly visually distinguish the advantages and disadvantages of the vehicle-mounted refrigerator and can not scientifically select and purchase products suitable for the psychoscope.

For the vehicle-mounted refrigerator, one of the most concerned performances is the high-temperature cooling capacity of the vehicle-mounted refrigerator based on the use scene. For the evaluation of the high temperature cooling capability of the refrigeration device, only the "domestic and similar refrigeration devices (GB/T8059-2016) and the IEC 62552-2 are related to the evaluation method of the capability of the refrigeration device at high ambient temperature.

The evaluation method is characterized in that the method focuses more on a use scene of the household refrigeration appliance in an indoor environment, the test environment temperature is 43 ℃, the appliance is statically placed on a test platform, and copper column temperature sensors are arranged in each refrigeration chamber. The procedure for the specific test was: the appliance is powered off, and the appliance is placed in a test box with the ambient temperature of 43 ℃ in a state that the door or the cover is opened, so that the appliance reaches the ambient temperature; then closing the door without electrifying, and continuously placing the appliance for 30min under the state that the appliance reaches the starting condition of the cooling test; the power-on operation is started until the average temperature of each compartment reaches the temperature value required by the standard.

The evaluation method aims at the standby capacity of the refrigeration appliance in the international tropical T climate environment, namely the high-temperature environment of 43 ℃. The evaluation of the refrigeration appliance in a household scene is embodied. However, the main usage scenarios of the vehicle-mounted refrigerator are a vehicle-mounted environment, namely a vibration environment during the driving process of a vehicle and an outdoor high-temperature high-humidity environment. The evaluation method cannot effectively evaluate the performance of an in-vehicle refrigerator operating under vibration, closed, and high-temperature and high-humidity environments.

Disclosure of Invention

The invention aims to provide a high-temperature cooling test method for a portable compression type vehicle-mounted refrigerator.

In order to achieve the purpose, the technical scheme adopted by the invention is as follows:

a high-temperature cooling test method for a portable compression type vehicle-mounted refrigerator comprises the following steps:

(1) Setting of the test device: a vibration table is adopted, and a closed test box is arranged above the vibration table; alternatively, a closed test chamber will be used, with the vibration table placed therein;

(2) Setting of test samples: placing a portable compression type vehicle-mounted refrigerator on a vibration table, placing the portable compression type vehicle-mounted refrigerator in a closed test box or a closed test chamber, and arranging a temperature sensor in the portable compression type vehicle-mounted refrigerator;

(3) Setting the test environment: opening a closed test box or a closed test chamber, setting the internal environmental condition to be 55 ℃ and the relative humidity to be 90%; starting the vibration table to keep vibrating;

powering off the portable compression type vehicle-mounted refrigerator, and opening a door or a cover to enable the temperature of each temperature sensor in a chamber inside the portable compression type vehicle-mounted refrigerator to reach the ambient temperature;

when the temperature of each temperature sensor in the compartment reaches the ambient temperature, closing the door or the cover, and continuously placing for 30min in the state;

(4) The test was started: the portable compression type vehicle-mounted refrigerator is powered on to run, so that the average temperature in the room (namely the average temperature recorded by the temperature sensor) reaches the set temperature, and the time from the start of the test to the set temperature is recorded.

Since the portable compression type vehicle-mounted refrigerator is used in a vehicle and has a short and narrow space, the compartment for storage in the refrigerator is generally about 15-50L, and therefore the invention is provided with three temperature sensors. The temperature sensors are uniformly arranged along the horizontal or vertical direction of the compartment, the distance between each temperature sensor and the inner wall of the compartment of the vehicle-mounted refrigerator is more than or equal to 25mm, and the distance between each two temperature sensors is more than or equal to 50mm; when the distance between every two temperature sensors is less than 50mm, the number of the temperature sensors is correspondingly reduced.

The vibration frequency of the vibration table is controlled by a vibration frequency regulator, and the vibration table vibrates randomly within the vibration frequency of 10-1000 Hz.

In the step (4), before the test is started, the average temperature change in the compartment of the vehicle-mounted refrigerator is not more than 0.3 ℃, wherein the average temperature change refers to the change of the average temperature in the compartment in an adjacent compressor start-stop period.

The invention has the beneficial effects that:

1. the invention utilizes the test device arranged on the vibration table and the closed test box/closed test chamber to realize the combination of high-temperature and high-humidity climatic environment and vibrating mechanical environment, and more effectively simulates the actual working environment of the vehicle-mounted refrigerator, thereby truly and effectively evaluating the refrigeration performance of the portable compression type vehicle-mounted refrigerator;

in addition, the invention sets the high-temperature and high-humidity environmental conditions to test the cooling performance of the portable vehicle-mounted refrigerator, can effectively determine the refrigerating capacity of the portable vehicle-mounted refrigerator, and better embodies the refrigerating capacity of the portable vehicle-mounted refrigerator when the portable vehicle-mounted refrigerator is used on a traveling automobile.

2. According to the container characteristics of the portable compression type vehicle-mounted refrigerator, the arrangement scheme of the temperature sensor is designed, the internal temperature can be reflected, and the test data is more accurate.

3. The test method has clear steps and strong operability, and avoids errors caused by subjective factors.

Drawings

FIG. 1 is a diagram of a test apparatus employing a closed test chamber and a vibration table arrangement;

FIG. 2 is a view of the apparatus of FIG. 1 with the enclosed test chamber removed;

FIG. 3 is a diagram of the arrangement of temperature sensors in compartments of six different shapes; wherein a-f are top views of the chambers, and a '-f' are front views corresponding to the chambers a-f.

Reference numerals: 1-a vibration table; 2-sealing the test chamber; 3-portable compression type vehicle-mounted refrigerator; 4-temperature and humidity regulator; 5-vibration frequency regulator; 6-temperature recorder.

Detailed Description

The following examples are only for illustrating the present invention, and the scope of the present invention is not limited to only the following examples. The objectives of the present invention can be achieved by the ordinary skilled person in the art according to the disclosure of the present invention and the ranges of the parameters.

Referring to fig. 1 and 2, a test apparatus using a closed test chamber and a vibration table is shown; the method specifically comprises the following steps: a closed test box 2 is arranged above the vibration table 1; placing a portable compression type vehicle-mounted refrigerator 3 in a closed test box 2, wherein a temperature sensor is arranged in the portable compression type vehicle-mounted refrigerator 3 and is connected with a temperature recorder 6 outside the closed test chamber 2 through a circuit; the vibration table 1 is connected with a vibration frequency regulator 5 to control the vibration frequency of the vibration table; the closed test chamber 2 is connected with a temperature and humidity regulator 4 to control the temperature and humidity inside the closed test chamber.

As shown in fig. 3, the temperature sensors are arranged according to the shape of the compartment in the portable compression type in-vehicle refrigerator, and T1, T2, and T3 are 3 temperature sensors, respectively. Specifically, the method comprises the following steps:

a boss is arranged in the chamber a, and the rest space is called as an actual chamber; wherein L1 is the length of the boss, L2 is the actual compartment length, W is the compartment width, h is the compartment height, and h1 is the internal height of the boss; l2 is more than h in the chamber a, the temperature sensors T1, T2 and T3 are uniformly arranged along the horizontal direction of the middle part of the chamber;

wherein T1 is arranged at the central position on the boss, namely at a position which is L1/2 away from the right side wall, W/2 away from the front and rear walls and h1/2 away from the upper and lower walls; t2 and T3 are spaced by L2/3 in pairs in the actual compartment, are spaced by L2/3 from the nearest side wall (boss), are spaced by h/2 from the upper wall and the lower wall, and are spaced by W/2 from the front wall and the rear wall;

a groove is arranged in the chamber b, and L2 is more than h, 3 temperature sensors are uniformly arranged along the horizontal direction of the middle part of the chamber, and T1 is arranged at the central position in the groove, and the specific arrangement mode is similar to that of the chamber a;

the compartment of c is a square compartment, and L is the length of the compartment; when L is larger than h, 3 temperature sensors are uniformly arranged in the middle of the chamber in the horizontal direction, the specific arrangement mode is similar to that of the chamber a, wherein the distance between every two temperature sensors T1, T2 and T3 is L/4, and the distance between the temperature sensors T1, T2 and T3 and the distance between the temperature sensors T/2 and the upper wall and the lower wall are h/2;

d, a boss is arranged in the chamber, the actual chamber length L2 is less than the height h, T2 and T3 are arranged along the vertical direction of the middle part of the chamber, and T1 is arranged at the center above the boss;

wherein T1 is arranged at the central position on the boss, namely at a position which is L1/2 away from the right side wall, W/2 away from the front and rear walls and h1/2 away from the upper and lower walls; the distance between T2 and T3 is h/3 in the actual chamber, L2/2 away from the nearest side wall (boss), h/3 away from the upper and lower walls and W/2 away from the front and rear walls;

a groove is formed in the chamber e, T2 and T3 are uniformly arranged along the vertical direction of the middle part of the chamber when the actual chamber length L2 is less than the height h, and T1 is arranged at the central position in the groove, and the specific arrangement mode is similar to that of the chamber d;

the chamber of f is a square chamber, when the length L is less than the height h, 3 temperature sensors are uniformly arranged in the vertical direction of the middle part of the chamber, wherein the distance between every two temperature sensors T1, T2 and T3 is h/4, and the distance between every two temperature sensors T1, T2 and T3 and the side wall is L/2.

Examples 1 to 3 high temperature cooling tests were carried out on portable compression type vehicle-mounted refrigerators of different manufacturers by the following operations:

(1) A test device is arranged according to the figure 1 and the figure 2;

specifically, the vibration table adopts an electric vibration test system with model number ES-50/LT0909, and the system comprises a vibration frequency regulator; the closed test box adopts a model 7076804 three comprehensive test boxes which comprise a temperature and humidity regulator; the temperature recorder adopts a temperature recorder with a model DR 130.

(2) Arranging a temperature sensor in the portable compression type vehicle-mounted refrigerator; the positions of the temperature sensors are uniformly arranged along the horizontal or vertical direction in the middle of the chamber, and the arrangement mode is as follows: the distance between all the temperature sensors and the inner wall of the compartment of the vehicle-mounted refrigerator is more than or equal to 25mm, and the distance between every two temperature sensors is more than or equal to 50mm;

(3) Opening a closed test box, setting the environmental condition in the closed test box to be 55 ℃ and the relative humidity to be 90%, and opening a vibration table to keep the vibration in the frequency range of 10-1000 Hz; powering off the portable compression type vehicle-mounted refrigerator, and opening a door or a cover to enable the temperature of each temperature sensor in a compartment of the portable compression type vehicle-mounted refrigerator to reach the ambient temperature;

when the temperature of each temperature sensor in the compartment reached ambient temperature, the door or lid was closed and left in this state for 30min.

(4) And (3) starting the test after confirming that the average temperature change in the chamber of the vehicle-mounted refrigerator is not more than 0.3 ℃, electrifying the vehicle-mounted refrigerator to operate so that the average temperature in the chamber reaches 4 ℃, and recording the time from the start of the test to the temperature.

TABLE 1

Examples	Sample size	Time (min) for average temperature to reach 4 DEG C	Arrangement mode of temperature sensor
				1	C40	102	A and a 'in FIG. 3'
2	ECX50	150	B and b 'in FIG. 3'
				3	MT25	93	C and c 'in FIG. 3'

Examples 4 to 5 high temperature cooling tests were carried out on portable compression type vehicle-mounted refrigerators of different manufacturers by the following operations:

(1) Setting of the test device: arranging a vibration table in a closed test chamber;

specifically, the vibration table adopts a vibration test table with the model of HD-A521, and is connected with a vibration frequency regulator; the closed test chamber adopts a closed room which can control temperature and humidity;

(2) Arranging a temperature sensor in the portable compression type vehicle-mounted refrigerator, and acquiring and recording data of the temperature sensor by a temperature recorder; the temperature sensor is based on the geometric center of the sensor, and the arrangement mode is as follows: the distance between all the temperature sensors and the inner wall of the compartment of the vehicle-mounted refrigerator is more than or equal to 25mm, and the distance between every two temperature sensors is more than or equal to 50mm;

(3) Opening a closed test chamber, setting the environmental condition in the closed test chamber to be 55 ℃ and the relative humidity to be 90 percent, and opening a vibration table to keep the vibration in the frequency range of 10-1000 Hz; powering off the portable compression type vehicle-mounted refrigerator, and opening a door or a cover to enable the temperature of each temperature sensor in a compartment of the portable compression type vehicle-mounted refrigerator to reach the ambient temperature;

TABLE 2

Examples	Sample size	Time (min) for average temperature to reach 4 DEG C	Arrangement mode of temperature sensor
				4	CL40	131	A and a 'in FIG. 3'
5	P18	90	F and f 'in FIG. 3'

The present invention may be embodied in other specific forms without departing from its spirit or essential characteristics. The above-described embodiments of the present invention are to be considered in all respects as illustrative and not restrictive. Therefore, any minor modifications, equivalent changes and modifications to the above embodiments according to the spirit of the present invention are within the scope of the technical solution of the present invention.

Claims

1. A high-temperature cooling test method for a portable compression type vehicle-mounted refrigerator is characterized by comprising the following steps:

(4) The test was started: the portable compression type vehicle-mounted refrigerator is electrified to run, so that the average temperature in the room reaches the set temperature, and the time from the test start to the set temperature is recorded.

2. The high temperature cooling test method for the portable compression type vehicle-mounted refrigerator as claimed in claim 1, wherein three temperature sensors are arranged in a chamber of the portable compression type vehicle-mounted refrigerator;

the temperature sensors are uniformly arranged along the horizontal or vertical direction of the compartment, the distance between each temperature sensor and the inner wall of the compartment is more than or equal to 25mm, and the distance between each two temperature sensors is more than or equal to 50mm.

3. The high temperature drop test method of claim 2, wherein the vibration frequency of the vibration table is controlled by a vibration frequency controller, and the vibration table vibrates randomly within a vibration frequency range of 10 to 1000 Hz.

4. The high temperature drop test method for a portable compression type vehicle refrigerator according to claim 3, wherein in the step (4), the average temperature change in the compartment of the vehicle refrigerator does not exceed 0.3 ℃ before the test is started.