Thermal insulation container double-probe thermal insulation efficiency detection equipment and detection method

Abstract

The invention discloses a double-probe heat preservation efficiency detection device and method for a heat preservation container, the detection device is provided with a double-probe temperature measuring head, the right side of a high-frequency machine host is fixedly and electrically connected with a high-frequency machine heating coil, the top of the high-frequency machine heating coil is provided with a to-be-detected container, the to-be-detected container is arranged below the double-probe temperature measuring head, and the double-probe temperature measuring head is electrically connected with the high-frequency machine heating coil. A temperature control sensor fixedly installed at the bottom of the supporting plate is arranged below the high-frequency machine heating coil, and the temperature control sensor and the double-needle temperature measuring head are both electrically connected with the electric cabinet. The high-frequency machine host and the high-frequency machine heating coil are matched, a detected container is heated through an ultrahigh-frequency heating method, the temperature can be rapidly increased to the preset temperature in a short time, thermal shock detection is formed, the double-needle temperature measurement head and the temperature control sensor are matched for temperature measurement, the temperature measurement process is not affected by the residual heat of the probe and the environment temperature, and the temperature measurement accuracy is improved. And the temperature is not influenced by the reflectivity, the surface condition, the thickness and other factors of the measured object, so that the temperature measurement is more accurate.

Description

Technical Field

[0001] The present invention relates to the technical field of thermal insulation efficiency detection of thermal insulation containers, and in particular to a thermal insulation efficiency detection device and a detection method for thermal insulation containers with double probes. Background Art

[0002] Stainless steel insulation containers are generally composed of an outer shell, a vacuum layer and an inner liner, wherein the vacuum layer is located between the inner liner and the outer shell. The existence of the vacuum layer is the core requirement for the insulation efficiency of the insulation container. The existing insulation efficiency detection method of the insulation container is to heat the air or heating plate (medium) through a heat source, and then heat the inner wall or outer shell of the container through heat convection (exchange), heat transfer and heat radiation to form a temperature difference, and then measure the temperature in a contact or non-contact manner. The contact temperature measurement uses touch or thermocouple measurement, and the non-contact temperature measurement uses thermal imaging, infrared probes and other methods to judge whether it is good or not;

[0003] The detection of thermal insulation efficiency of thermal insulation containers in the prior art has the following deficiencies: 1. The existing heating method is indirect heating, and the heating efficiency is low. Due to the influence of ambient temperature, its heating accuracy is not high, and preheating is required, which has high energy consumption. In addition, it heats slowly and there is no thermal shock, which is inconsistent with the actual use scenario, and there is heat emission during the heating process, which is not friendly to the environment and the operator's working environment; 2. The existing non-contact temperature measurement method is easily affected by factors such as ambient temperature and the emissivity, surface conditions, and thickness of the object being measured, resulting in misjudgment or instability in the measurement results, and the probe will have residual temperature during the long-term temperature measurement process, which ultimately affects the test effect. In addition, contact temperature measurement has high labor intensity, inconsistent temperature measurement standards, and environmental factors affect the judgment; Based on the above, the present application proposes a dual-probe thermal insulation efficiency detection device and detection method for thermal insulation containers. Summary of the invention

[0004] Based on the technical problems existing in the background technology, the present invention proposes a dual-probe thermal insulation efficiency detection device and a detection method for a thermal insulation container.

[0005] The present invention proposes a double-probe thermal insulation efficiency detection device for an insulated container, comprising a mounting frame, a support plate fixedly installed in the mounting frame, a high-frequency machine mainframe fixedly connected to the top of the support plate, an electric control box fixedly connected to the top inner wall of the mounting frame, the electric control box is electrically connected to the high-frequency machine mainframe, a Z-axis slide is fixedly connected to the right side of the mounting frame, an L-shaped fixing plate is fixedly connected to the output shaft end of the Z-axis slide, a temperature measuring head fixing block is embedded and fixed on the top of the L-shaped fixing plate, a double-needle temperature measuring head is fixedly connected to the bottom of the temperature measuring head fixing block, a high-frequency machine heating coil is fixedly connected to the right side of the high-frequency machine mainframe and is electrically connected, a container to be tested is placed on the top of the high-frequency machine heating coil, the container to be tested is arranged below the double-needle temperature measuring head, a temperature control sensor fixedly installed on the bottom of the support plate is provided below the high-frequency machine heating coil, and both the temperature control sensor and the double-needle temperature measuring head are electrically connected to the electric control box.

[0006] Preferably, a support rod is fixedly connected to the right side of the high-frequency machine mainframe, and the right end of the support rod is fixedly connected to the left side of the high-frequency machine heating coil. The support rod is a copper tube with a hollow structure. The support rod and the high-frequency machine heating coil are integrated and connected and fixed by 3D printing and welding. The interior of the support rod and the high-frequency machine heating coil is filled with coolant, cooling water or cooling oil, and the outer shell of the container to be tested is made of metal.

[0007] The present invention also proposes a dual-probe thermal insulation efficiency detection method for a thermal insulation container, comprising the following steps:

[0008] S1: Place the container under test on top of the high-frequency machine heating coil;

[0009] S2: Send instructions to the high-frequency machine host through the computer preset program in the electric control box, and the high-frequency machine host controls the high-frequency machine heating coil to generate a corresponding magnetic field;

[0010] S3: The magnetic field generated in S2 acts on the metal shell of the container under test. The metal generates eddy current due to electromagnetic induction. The eddy current generates heat energy under the interaction with the resistance of the metal itself. At the same time, the skin effect of high-frequency current is used to control the circulation to concentrate on the metal surface, so that only the shell of the container under test is heated. The frequency of the high-frequency current is in the range of 200-300KHZ. The lower the frequency of the high-frequency current, the deeper the conflict force of the skin effect, and the higher the frequency of the high-frequency current, the more obvious the skin effect. No preheating is required during heating. The preset temperature is >100℃, and the preset temperature is reached within 1-2 seconds, achieving rapid heating and forming thermal shock detection.

[0011] S4: The temperature control sensor monitors the heating temperature inside the container under test and transmits the monitored temperature to the electric control box;

[0012] S5: At the same time, the Z-axis slide table drives the temperature measuring head fixing block to move downward through the L-shaped fixing plate, and the temperature measuring head fixing block drives the double-needle temperature measuring head to move downward to the inside of the measured container. The double-needle temperature measuring head contacts the inner bottom wall of the measured container, and the double-needle temperature measuring head detects and collects temperature data in the measured container. The temperature measuring time of the double-needle temperature measuring head is n seconds, and the frequency is 100ms. The temperature data collected are T1, T2, T3...Tn in sequence, and the detected temperature data are transmitted to the electric control box;

[0013] S6: The electric control box uses its internal computer software algorithm to analyze the temperature data received in S4 and S5, and gives the analysis result in combination with the set temperature value.

[0014] Preferably, in S2, the computer preset program in the electric control box is as follows:

[0015]

[0016]

[0017] Preferably, the specific logical steps of S6 are as follows:

[0018] S601: The electric control box pre-processes the received temperature data through its internal computer software to ensure the accuracy and reliability of the data;

[0019] S602: The electric control box further analyzes the pre-processed temperature data and the preset set value according to the set algorithm, determines the deviation between the current temperature and the set temperature, and gives a corresponding determination result;

[0020] S603: According to the analysis results and control strategy in S602, the electric control box monitors the working status of the high-frequency machine host, and generates and saves the detection report.

[0021] Preferably, in S601, the data preprocessing includes denoising, filtering and calibration processing, and the procedure used in the data preprocessing is as follows:

[0022]

[0023]

[0024] Preferably, in S5, the thermocouple of the double-needle temperature measuring head is composed of two independent electrodes. When placed on the surface of the object to be measured, a thermocouple loop is formed. When there is a temperature gradient in the loop, an electromotive force is generated. When measuring the temperature, according to the principle of the Seebeck effect, the heat on the surface of the object to be measured is converted into an electrical signal for measurement.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] The present invention adopts a high-frequency machine mainframe and a high-frequency machine heating coil to heat the container under test by an ultra-high frequency heating method. This heating method can heat directly without heating the medium, and can quickly heat up to a preset temperature in a short time to form a thermal shock detection, which is in line with the actual use scenario. During heating, no preheating is required, and no long-term continuous heat preservation and heating medium are required. The energy consumption is low, high efficiency and energy saving are not affected by the ambient temperature, and it is environmentally friendly and has no heat emission. In addition, a double-needle temperature measuring head and a temperature control sensor are used to measure the temperature. The temperature measurement process is not affected by the residual temperature of the probe and the ambient temperature, and will not be affected by the reflectivity, surface conditions, thickness and other factors of the object under test. The labor intensity is reduced, and the temperature measurement is more accurate. It can withstand high temperature environments and has strong anti-interference capabilities. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a schematic diagram of the structure of a dual-probe thermal insulation efficiency testing device for thermal insulation containers proposed by the present invention;

[0028] Figure 2 for Figure 1 A schematic diagram of the enlarged structure of part A;

[0029] Figure 3 This is a temperature rise curve diagram of the present invention in which the temperature of the cup is measured 7 times.

[0030] In the figure: 1. Z-axis slide; 2. Temperature measuring head fixing block; 3. Double-needle temperature measuring head; 4. Container to be measured; 5. High-frequency machine heating coil; 6. Temperature control sensor; 7. Electric control box; 8. High-frequency machine host; 9. Mounting frame; 10. Support plate; 11. Support rod; 12. L-shaped fixing plate. DETAILED DESCRIPTION

[0031] The present invention will be further explained below in conjunction with specific embodiments.

[0032] Example

[0033] Reference Figure 1-2The present embodiment proposes a double-probe thermal insulation efficiency detection device for an insulated container, including a mounting frame 9, a support plate 10 is fixedly installed in the mounting frame 9, a high-frequency machine mainframe 8 is fixedly connected to the top of the support plate 10, an electric control box 7 is fixedly connected to the inner wall of the top of the mounting frame 9, and the electric control box 7 is electrically connected to the high-frequency machine mainframe 8, a Z-axis slide 1 is fixedly connected to the right side of the mounting frame 9, an L-shaped fixing plate 12 is fixedly connected to the output shaft end of the Z-axis slide 1, a temperature measuring head fixing block 2 is embedded and fixed on the top of the L-shaped fixing plate 12, a double-needle temperature measuring head 3 is fixedly connected to the bottom end of the temperature measuring head fixing block 2, a high-frequency machine heating coil 5 is fixedly connected to the right side of the high-frequency machine mainframe 8 and electrically connected, wherein the right side of the high-frequency machine mainframe 8 is fixedly connected to the support rod 1 1. The right end of the support rod 11 is fixedly connected to the left side of the high-frequency machine heating coil 5. The support rod 11 is a copper tube with a hollow structure. The support rod 11 and the high-frequency machine heating coil 5 are integrated, connected and fixed by 3D printing and welding. The interior of the support rod 11 and the high-frequency machine heating coil 5 is filled with coolant, cooling water or cooling oil. The support rod 11 is used to support the high-frequency machine heating coil 5. A measured container 4 is placed on the top of the high-frequency machine heating coil 5. The shell of the measured container 4 is made of metal. The measured container 4 is arranged below the double-needle temperature measuring head 3. A temperature control sensor 6 fixedly installed on the bottom of the support plate 10 is provided below the high-frequency machine heating coil 5. The temperature control sensor 6 and the double-needle temperature measuring head 3 are both electrically connected to the electric control box 7.

[0034] This embodiment also proposes a dual-probe thermal insulation efficiency detection method for a thermal insulation container, comprising the following steps:

[0035] S1: Place the container 4 to be tested on top of the high frequency machine heating coil 5;

[0036] S2: Sending instructions to the high-frequency machine host 8 through the computer preset program in the electric control box 7, and the high-frequency machine host 8 controls the high-frequency machine heating coil 5 to generate a corresponding magnetic field;

[0037] The computer preset program in the electric control box 7 is as follows:

[0038] #Define the control parameters of the high frequency machine host

[0039]

[0040]

[0041] S3: The magnetic field generated in S2 acts on the metal shell of the measured container 4. The metal generates eddy current due to electromagnetic induction. The eddy current generates heat energy under the interaction with the resistance of the metal itself. At the same time, the skin effect of the high-frequency current is used to control the circulation to concentrate on the metal surface, so that only the shell of the measured container 4 is heated. The frequency of the high-frequency current is in the range of 200-300KHZ. The lower the frequency of the high-frequency current, the deeper the conflict force of the skin effect, and the higher the frequency of the high-frequency current, the more obvious the skin effect. No preheating is required during heating. The preset temperature is >100℃, and the preset temperature is reached within 1.5S to achieve rapid heating. , forming a thermal shock test, this step uses high-frequency current heating. The mainstream heating method in the prior art is to transfer heat to the container under test through hot air or a heating plate. The heating and temperature rise is a slow process. Usually, the temperature rise process is 5 degrees or 10 degrees. It takes about 30 seconds to heat the container from room temperature to 100 degrees with 200-degree hot air. In this step, high-frequency current heating is used. The heating process only takes 1-2 seconds to reach the set temperature. In fact, the heating is completed in 1.5 seconds. At the same time, since the adaptation process of the container is short, it is also a test of the manufacturing process and quality of the container, and it is also equivalent to another aspect of the quality inspection of the container;

[0042] S4: The temperature control sensor 6 monitors the heating temperature inside the measured container 4 and transmits the monitored temperature to the electric control box 7;

[0043] S5: At the same time, the Z-axis slide 1 drives the temperature measuring head fixing block 2 to move downward through the L-shaped fixing plate 12, and the temperature measuring head fixing block 2 drives the double-needle temperature measuring head 3 to move downward to the inside of the measured container 4, and the double-needle temperature measuring head 3 contacts the inner bottom wall of the measured container 4, and the double-needle temperature measuring head 3 collects the temperature data in the measured container 4. The temperature measuring time of the double-needle temperature measuring head 3 is n seconds, and the frequency is 100ms. The temperature data collected are T1, T2, T3...Tn in sequence. The double-needle temperature measuring head 3 repeats the temperature measurement 7 times, and the obtained temperature rise curve is as follows Figure 3 As shown, the detected temperature data is transmitted to the electric control box 7;

[0044] The thermocouple of the double-needle temperature measuring head 3 is composed of two independent electrodes. When placed on the surface of the object to be measured, a thermocouple loop will be formed. When there is a temperature gradient in the loop, an electromotive force will be generated. When measuring the temperature, according to the principle of the Seebeck effect, the heat on the surface of the object to be measured is converted into an electrical signal for measurement;

[0045] S6: The electric control box 7 uses its internal computer software algorithm to analyze the temperature data received in S4 and S5, and gives the analysis result in combination with the set temperature value;

[0046] The specific logical steps are as follows:

[0047] S601: The electric control box 7 pre-processes the received temperature data through its internal computer software, including denoising, filtering and calibration processing, to ensure the accuracy and reliability of the data;

[0048] The procedure used for data preprocessing is as follows:

[0049]

[0050]

[0051] S602: the electric control box 7 further analyzes the pre-processed temperature data and the preset set value according to the set algorithm, determines the deviation between the current temperature and the set temperature, and gives a corresponding determination result;

[0052] S603: According to the analysis results and control strategy in S602, the electric control box 7 monitors the working status of the high-frequency machine host 8, and generates and saves the detection report;

[0053] This embodiment adopts the cooperation of the high-frequency machine mainframe 8 and the high-frequency machine heating coil 5, and adopts the ultra-high frequency heating method to heat the container 4 to be tested. This heating method can heat directly without heating the medium, and can quickly heat up to the preset temperature in a short time to form a thermal shock detection, which is in line with the actual use scenario. When heating, there is no need for preheating, and there is no need to keep the heating medium warm for a long time. It has low energy consumption, high efficiency and energy saving, is not affected by the ambient temperature, and is environmentally friendly and has no heat emission. In addition, the temperature measurement method using the double-needle temperature measuring head 3 and the temperature control sensor 6 is adopted. The temperature measurement process is not affected by the residual temperature of the probe and the ambient temperature, nor is it affected by the reflectivity, surface conditions, thickness and other factors of the object to be measured, which reduces labor intensity, and the temperature measurement is more accurate. It can withstand high temperature environments and has strong anti-interference ability.

[0054] The present invention collects temperature data of the cup 7 times, and the specific test data are shown in Table 1:

[0055]

[0056] Table 1 The present invention detects the temperature of the bottom of the cup 7 times, and the specific detection data are shown in Table 2:

[0057]

[0058] Table 2

[0059] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A temperature detection device for a heat preservation container with dual heat preservation efficiency probe, comprising a mounting frame (9), characterized in that: A support plate (10) is fixedly installed in the mounting frame (9), the top of the support plate (10) is fixedly connected to a high-frequency machine mainframe (8), an electric control box (7) is fixedly connected to the inner wall of the top of the mounting frame (9), the electric control box (7) is electrically connected to the high-frequency machine mainframe (8), a Z-axis slide table (1) is fixedly connected to the right side of the mounting frame (9), an L-shaped fixed plate (12) is fixedly connected to the output shaft end of the Z-axis slide table (1), a temperature measuring head fixing block (2) is embedded and fixed on the top of the L-shaped fixed plate (12), and the measuring head fixing block (2) is fixedly connected to the output shaft end of the Z-axis slide table (1). A double-needle temperature measuring head (3) is fixedly connected to the bottom end of the temperature head fixing block (2); a high-frequency machine heating coil (5) is fixedly connected to the right side of the high-frequency machine mainframe (8); a container (4) to be measured is placed on the top of the high-frequency machine heating coil (5); the container (4) to be measured is located below the double-needle temperature measuring head (3); a temperature control sensor (6) fixedly installed on the bottom of the support plate (10) is provided below the high-frequency machine heating coil (5); and both the temperature control sensor (6) and the double-needle temperature measuring head (3) are electrically connected to an electric control box (7).

2. A dual-probe thermal insulation efficiency testing device for thermal insulation containers according to claim 1, characterized in that: A support rod (11) is fixedly connected to the right side of the high-frequency machine mainframe (8), and the right end of the support rod (11) is fixedly connected to the left side of the high-frequency machine heating coil (5). The support rod (11) is a copper tube with a hollow structure. The support rod (11) and the high-frequency machine heating coil (5) are connected and fixed in an integrated manner by 3D printing and welding. The interior of the support rod (11) and the high-frequency machine heating coil (5) is filled with coolant, cooling water or cooling oil. The outer shell of the measured container (4) is made of metal.

3. A method for detecting the thermal insulation efficiency of a thermal insulation container using a dual-probe thermal insulation performance detection device, characterized in that: The following steps are involved: S1: placing the container (4) to be tested on top of the high frequency machine heating coil (5); S2: A computer preset program in the electric control box (7) sends a command to the high-frequency machine host (8), and the high-frequency machine host (8) controls the high-frequency machine heating coil (5) to generate a corresponding magnetic field; S3: The magnetic field generated in S2 acts on the metal shell of the container (4) to be tested. The metal generates eddy current due to electromagnetic induction. The eddy current generates heat energy under the interaction with the resistance of the metal itself. At the same time, the skin effect of the high-frequency current is used to control the circulating current to be concentrated on the metal surface, so that only the shell of the container (4) to be tested is heated. The frequency of the high-frequency current is in the range of 200-300KHZ. The lower the frequency of the high-frequency current, the deeper the conflict force of the skin effect, and the higher the frequency of the high-frequency current, the more obvious the skin effect. No preheating is required during heating. The preset temperature is >100°C. The preset temperature is reached within 1-2 seconds, and rapid heating is achieved to form thermal shock detection. S4: The temperature control sensor (6) monitors the heating temperature inside the container (4) being tested, and transmits the monitored temperature to the electric control box (7); S5: At the same time, the Z-axis slide (1) drives the temperature measuring head fixing block (2) to move downward through the L-shaped fixing plate (12), and the temperature measuring head fixing block (2) drives the double-needle temperature measuring head (3) to move downward to the inside of the measured container (4), and the double-needle temperature measuring head (3) contacts the inner bottom wall of the measured container (4). The double-needle temperature measuring head (3) detects and collects temperature data in the measured container (4). The temperature measurement time of the double-needle temperature measuring head (3) is n seconds, and the frequency is 100 ms. The temperature data collected are T1, T2, T3 ... Tn in sequence, and the detected temperature data is transmitted to the electric control box (7); S6: The electric control box (7) uses its internal computer software algorithm to analyze the temperature data received in S4 and S5, and gives the analysis result in combination with the set temperature value.

4. The detection method of the double-probe thermal insulation efficiency detection device for thermal insulation containers according to claim 3 is characterized in that: The specific logical steps of S6 are as follows: S601: The electric control box (7) pre-processes the received temperature data through its internal computer software to ensure the accuracy and reliability of the data; S602: the electric control box (7) further analyzes the pre-processed temperature data and the preset set value according to the set algorithm, determines the deviation between the current temperature and the set temperature, and gives a corresponding determination result; S603: Based on the analysis results and control strategy in S602, the electric control box (7) monitors the working status of the high-frequency machine host (8), and generates and saves a detection report.

5. The detection method of the double-probe thermal insulation efficiency detection device for thermal insulation containers according to claim 4, characterized in that: In S601, data preprocessing includes denoising, filtering and calibration processing.

6. The detection method of the double-probe thermal insulation efficiency detection device for thermal insulation containers according to claim 3, characterized in that: In S5, the thermocouple of the double-needle temperature measuring head (3) is composed of two independent electrodes. When placed on the surface of the object to be measured, a thermocouple loop is formed. When a temperature gradient exists in the loop, an electromotive force is generated. When measuring the temperature, the heat on the surface of the object to be measured is converted into an electrical signal for measurement according to the principle of the Seebeck effect.

Images