Test fixture and test system

Abstract

The present application relates to a test fixture and a test system, the test fixture comprising: a base having a receiving groove for accommodating a heat-generating body; a sealing cover mounted on the base, the base and the sealing cover defining a sealed cavity in communication with the receiving groove; and a fixing member supported on the base, the fixing member partially covering an open end of the receiving groove to hold the heat-generating body. The recessed design of the receiving groove can provide sufficient test area to fully accommodate the heat-generating body and other necessary components, and to provide sufficient contact area between the heat-generating body and a liquid drop. The fixing member can prevent the heat-generating body from moving during the test while facilitating replacement of the heat-generating body. The sealing cover and the base together form a sealed environment, thereby preventing the test results from being affected by external environment (e.g. temperature, air pressure), and improving the accuracy of the test results.

Description

Technical Field

[0001] This application relates to the field of atomization technology, and in particular to a test fixture and test system. Background Technology

[0002] Some atomizing devices use porous ceramics and other materials as heating elements to heat the aerosol generating matrix. After the aerosol generating matrix comes into contact with the surface of the heating element, it first wets and spreads on the surface of the heating element under the action of surface tension. Then, under the action of capillary force formed by the pore structure in the heating element, it penetrates into the micropores of the heating element. The heating element can generate heat under the action of electrical energy to heat and atomize the aerosol generating matrix. The atomized aerosol generating matrix produces aerosols that can be absorbed by the human body through the respiratory system.

[0003] During the heating and atomization process, if the liquid seepage rate of the heating element is too fast, it will cause leakage of the aerosol generation matrix. If the liquid seepage rate of the heating element is too slow, it will lead to insufficient liquid supply and dry burning, thus affecting the atomization effect and user experience. Therefore, the seepage rate of the heating element during the atomization process is one of the key parameters for evaluating the performance of the heating element.

[0004] However, current methods for testing the penetration rate of the heating element during atomization are limited, making it difficult to conveniently and effectively fix the heating element. Furthermore, the test results are easily affected by external environmental conditions, making it difficult to accurately assess the penetration rate of the heating element during atomization. Utility Model Content

[0005] Therefore, it is necessary to provide a test fixture and test system to address the problems that the test method for the matrix permeation rate of the heating element is easily affected by external environmental conditions and the heating element is difficult to fix.

[0006] A test fixture for testing the permeation rate of a heating element, the test fixture comprising:

[0007] The base has a receiving groove for accommodating the heating element;

[0008] A sealing cover, mounted on the base, defines a sealing cavity between the base and the sealing cover that communicates with the receiving groove; and

[0009] A fixing member, supported on the base, partially covers the opening end of the receiving groove to abut against the heating element.

[0010] In one embodiment, the fastener and the base are attracted to each other under magnetic force.

[0011] In one embodiment, the base is provided with a first adsorption element, and the fixing element is provided with a second adsorption element, and the first adsorption element and the second adsorption element attract each other under the action of magnetic force.

[0012] In one embodiment, the test fixture further includes a sealing ring disposed at the connection between the base and the sealing cover, the sealing ring being used to seal the gap between the base and the sealing cover.

[0013] In one embodiment, the sealing cover is formed of a transparent material.

[0014] A testing system includes the aforementioned testing fixture, and the testing system further includes:

[0015] A negative pressure device is connected to the sealed cavity of the test fixture, the negative pressure device being used to create a negative pressure environment in the sealed cavity; and

[0016] A testing device for dripping liquid droplets into the sealed cavity.

[0017] The negative pressure device includes a vacuum pump and a mass flow meter. The vacuum pump is connected to the sealed cavity through the flow control unit. The vacuum pump is used to extract gas from the sealed cavity, and the mass flow meter is used to control the airflow between the vacuum pump and the sealed cavity.

[0018] In one embodiment, the negative pressure device includes a differential pressure gauge for detecting the pressure within the sealed cavity.

[0019] In one embodiment, the testing apparatus includes:

[0020] The installation platform, on which the test fixture is supported;

[0021] A liquid dispensing unit includes a dispensing needle that extends into the sealed cavity and is used to dispense liquid droplets into the sealed cavity; and

[0022] A camera is located on one side of the test fixture, and the camera is used to acquire images inside the sealed cavity.

[0023] In one embodiment, the testing apparatus further includes a light-emitting unit located on one side of the testing fixture.

[0024] The aforementioned test fixture features a recessed design in the receiving groove, providing sufficient testing area to fully accommodate the heating element and other necessary components, and ensuring adequate contact area between the heating element and the droplet. The fixing element prevents movement of the heating element during testing while facilitating its replacement. The sealing cover, together with the base, forms a sealed environment, preventing test results from being affected by external environmental factors (such as temperature and air pressure), thus improving the accuracy of the test results. Attached Figure Description

[0025] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0026] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the modules of a test system according to one embodiment of this application.

[0028] Figure 2 This is a schematic diagram of the structure of a test fixture according to one embodiment of this application.

[0029] Figure 3 for Figure 2 The diagram shows the internal structure of the test fixture.

[0030] Figure 4 This is a schematic diagram of the structure of a test device according to one embodiment of this application.

[0031] Figure 5 This is a flowchart of a seepage rate testing method according to an embodiment of this application.

[0032] Explanation of reference numerals in the attached figures:

[0033] 100. Test system; 120. Test fixture; 120a. Sealed cavity; 121. Base; 121a. Receptacle; 1212. First adsorption element; 122. Sealing cover; 1221. Bottom wall of cover; 1223. Side wall of cover; 123. Fixture; 1232. Second adsorption element; 124. Sealing ring; 140. Negative pressure device; 141. Vacuum pump; 143. Flow control unit; 145. Pressure detection unit; 160. Test device; 161. Support base; 162. Bracket; 163. Mounting platform; 164. Liquid addition unit; 165. Imaging unit; 166. Light emission unit; 200. Heating element. Detailed Implementation

[0034] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0035] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0036] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0037] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0038] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0039] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0040] like Figure 1 As shown, embodiments of this application provide a testing system 100 for testing the permeation rate of a sample. Specifically, in the following embodiments, the sample is a heating element 200 applied to an electronic atomization device, and the heating element 200 is specifically formed of porous materials such as porous ceramics. The test liquid used to permeate the sample is an aerosol generating matrix applied to the electronic atomization device, including but not limited to medicinal liquids, oils, etc., used for medical, health, and beauty purposes.

[0041] It is understood that the application scenarios of the test system 100 of this application are not limited to this. In some other embodiments, the test system 100 can also be used to obtain the permeation rate of other different types of samples. The type of test liquid used for permeating the sample can also be set as needed, and is not limited here.

[0042] Please continue reading. Figure 1 The testing system 100 includes a testing fixture 120, a negative pressure device 140, and a testing device 160. The testing fixture 120 is used to fix the heating element 200, the negative pressure device 140 is used to provide a negative pressure environment for the heating element 200, and the testing device 160 is used to drip aerosol into the sealed cavity 120a to generate matrix droplets, and to acquire images during the permeation process to obtain the permeation time of the droplets entering the heating element 200. Finally, the permeation rate of the heating element 200 is obtained based on the droplet volume and the permeation time.

[0043] like Figure 2 and Figure 3As shown, the test fixture 120 includes a base 121, a sealing cover 122, and a fixing member 123. The base 121 has a receiving groove 121a for accommodating the heating element 200. The sealing cover 122 is mounted on the base 121, forming a sealed cavity 120a between the base 121 and the sealing cover 122, communicating with the receiving groove 121a. The fixing member 123 is supported on the base 121 and partially covers the opening end of the receiving groove 121a.

[0044] In the aforementioned test fixture 120, the recessed design of the receiving groove 121a provides a sufficient test area to fully accommodate the heating element 200 and other necessary components, and ensures sufficient contact area between the heating element 200 and the droplet. The fixing member 123 prevents the heating element 200 from moving during the test while facilitating its replacement. The sealing cover 122, together with the base 121, forms a sealed environment, thereby preventing the test results from being affected by the external environment (such as temperature and air pressure) and improving the accuracy of the test results.

[0045] Specifically, the base 121 has a rotating body structure with a central axis. The base 121 has a first surface and a second surface that are arranged opposite to each other along its central axis, and both the first surface and the second surface are perpendicular to the axial direction of the base 121. It can be understood that the shape of the base 121 is not limited to this and can be configured as needed to meet different requirements.

[0046] The receiving groove 121a extends from the first surface to the second surface along the axial direction of the base 121 to pass through the opposite ends of the base 121. The heating element 200 is located at the end of the receiving groove 121a near the first surface. The shape of the heating element 200 matches the shape of the receiving groove 121a. One side surface of the heating element 200 is exposed on the first surface to serve as a test surface for absorbing droplets. The test surface of the heating element 200 is flush with or protrudes from the first surface, thereby avoiding interference or obstruction of the test surface by the base 121, which facilitates test operation and data acquisition.

[0047] In some further embodiments, the receiving groove 121a includes a first receiving groove, a second receiving groove, and a connecting groove. The first receiving groove is formed at one end of the base 121 having a first surface and communicates with the first surface. The second receiving groove is formed at one end of the base 121 having a second surface and communicates with the second surface. The connecting groove is located between the first receiving groove and the second receiving groove and communicates with the first receiving groove and the second receiving groove. The inner diameter of the first receiving groove is smaller than the inner diameter of the second receiving groove, and the inner diameter of the connecting groove is smaller than the inner diameter of the first receiving groove. A stepped surface for supporting the heating element 200 is formed between the first receiving groove and the connecting groove. In this way, the shape of the heating element 200 matches the shape of the first receiving groove to be confined in the first receiving groove and supported on the stepped surface between the first receiving groove and the connecting groove.

[0048] In some embodiments, a sealing element is also sleeved around the heating element 200, and the sealing element surrounds the sidewall of the sealing element circumferentially. The sealing element is used to close the gap between the heating element 200 and the receiving groove 121a, thereby ensuring the sealing performance within the sealing cavity 120a. It is understood that the shape of the sealing element is not limited to this, and can be set as needed to achieve a good sealing effect.

[0049] In some embodiments, the fixing member 123 has a block-shaped structure. One side of the fixing member 123 is supported on the base 121 and attracts the base 121 under magnetic force. The other side of the fixing member 123 abuts against the heating element 200 to securely confine the heating element 200 within the receiving groove 121a. Specifically, in one embodiment, a first adsorption member 1212 is embedded on the first surface of the base 121, and a second adsorption member 1232 is embedded at the end of the fixing member 123 facing the base 121. The first adsorption member 1212 and the second adsorption member 1232 attract each other under magnetic force, thereby confining the first fixing member 123 on the base 121.

[0050] Thus, when it is necessary to replace the heating element 200 in the receiving slot 121a, the experimenter can remove the fixing member 123 by overcoming the magnetic force, and the heating element 200 can be taken out of the receiving slot 121a. After placing the new heating element 200 into the receiving slot 121a, the fixing member 123 can be placed back on the base 121 and held against the test surface of the heating element 200, thereby fixing the heating element 200. Since the heating element 200 is fixed by magnetic adsorption of the fixing member 123, and the fixing member 123 can apply pressure to the heating element 200 and the sealing member, the complicated operation of traditional mechanical clamping is avoided, and air leakage during the test is prevented, thus balancing sealing performance and ease of operation.

[0051] Specifically, in some embodiments, one of the first adsorption element 1212 and the second adsorption element 1232 is formed by an electromagnet or a permanent magnet, and the other is formed by a ferromagnetic material or a permanent magnet that can be attracted by an electromagnet or a permanent magnet. It is understood that the materials forming the first adsorption element 1212 and the second adsorption element 1232 are not limited to these and can be configured as needed to meet different requirements.

[0052] The sealing cover 122 is a cylindrical structure with one open end, including an integrally formed bottom wall 1221 and a side wall 1223. The side wall 1223 extends from the edge of the bottom wall 1221 in the same direction and surrounds the bottom wall 1221 circumferentially. A mounting groove extending around the central axis of the first surface of the base 121 is formed at its edge. The end of the side wall 1223 away from the top wall is inserted into the mounting groove, thereby forming a sealing cavity 120a together with the base 121. Furthermore, the sealing cover 122 is made of a transparent material to facilitate the imaging and observation of the permeation process.

[0053] In some embodiments, the test fixture 120 further includes at least one sealing ring 124, which is located between the base 121 and the sealing cover 122 to close the gap between the base 121 and the sealing cover 122. Specifically, the side wall 1223 of the sealing cover 122 and / or the groove wall of the mounting groove are provided with at least one circumferentially extending limiting groove, and each sealing ring 124 is correspondingly limited in one limiting groove, thereby sealing the gap between the base 121 and the sealing cover 122. It is understood that the number, position, and shape of the sealing rings 124 are not limited and can be set as needed to meet different sealing requirements.

[0054] Please combine Figure 1 , Figure 2 As shown, the negative pressure device 140 includes a vacuum unit 141 and a flow control unit 143. The side wall 1223 of the sealing cover 122 of the test fixture 120 has a communication hole. The vacuum unit 141 is connected to the flow control unit 143 through a pipe. The flow control unit 143 is connected to the communication hole of the sealing cavity 120a of the test fixture 120 through a pipe, so that the vacuum unit 141 is connected to the sealing cavity 120a through the flow control unit 143.

[0055] In one specific embodiment, the vacuum unit is a vacuum pump. The vacuum pump can achieve gas extraction and create a vacuum environment through mechanical movement, thereby extracting gas from the sealed cavity 120a to create a negative pressure environment within the sealed cavity 120a. In another specific embodiment, the vacuum pump includes a cylinder and a piston. The reciprocating motion of the piston within the cylinder creates a negative pressure within the cylinder to extract gas from the sealed cavity 120a. It is understood that in other embodiments, the vacuum unit 141 may be formed by other structures, which are not limited here to meet different testing requirements.

[0056] In one specific embodiment, the flow control unit 143 includes a mass flow meter and a regulating valve. The flow control unit 143 is used to detect and regulate the airflow velocity between the vacuum unit 141 and the sealed cavity 120a, thereby precisely controlling the gas pressure within the sealed cavity 120a. Specifically, the mass flow meter is an instrument used to measure the mass flow rate of gas, which can determine the flow rate by measuring the mass of gas flowing through the sensor per unit time. The opening of the regulating valve can change according to the flow rate obtained by the mass flow meter, thereby controlling the gas flow rate exiting the sealed cavity 120a.

[0057] In some embodiments, the negative pressure device 140 further includes a pressure detection unit 145, which is mounted in the base 121 of the test fixture 120 and is used to detect the real-time pressure inside the sealed cavity 120a. Specifically, in one embodiment, the pressure detection unit 145 is a differential pressure gauge. As a pressure measuring instrument used to measure the pressure difference between two different points, the differential pressure gauge can measure the pressure difference inside and outside the sealed cavity 120a.

[0058] Please combine Figure 1 , Figure 2 as well as Figure 4 As shown, in some embodiments, the testing device 160 includes a support base 161, a bracket 162, a mounting platform 163, a liquid addition unit 164, and an imaging unit 165.

[0059] The support base 161 is supported on a support surface such as a desktop. In the following embodiments, the length direction of the support base 161 is defined as the first direction (i.e., Figure 4 In the X direction), the width direction of the support 161 is defined as the second direction (i.e., Figure 4 In the Y direction), the height direction of the support 161 is defined as the third direction (i.e., Figure 4 In the Z direction), the first direction, the second direction, and the third direction intersect each other, and in a preferred embodiment, the first direction, the second direction, and the third direction are perpendicular to each other.

[0060] One end of the bracket 162 is connected to one side of the support base 161 in the first direction, and the other end of the bracket 162 extends obliquely toward the other side of the support base 161 in the second direction, and the distance between the bracket 162 and the support base 161 in the third direction gradually increases.

[0061] Mounting platform 163 is mounted on support base 161 and is located below bracket 162 in the third direction. Mounting platform 163 is used to support test fixture 120. In a preferred embodiment, the height of mounting platform 163 in the third direction and the tilt angle of mounting platform 163 relative to the third direction can be adjusted as needed, thereby adjusting the height of test fixture 120 in the third direction and the tilt effect relative to the third direction.

[0062] The liquid addition unit 164 is installed at the end of the bracket 162 away from the support base 161. The liquid addition unit 164 includes a liquid addition needle. The top wall of the sealing cover 122 of the test fixture 120 has a connecting hole. The liquid addition needle passes through the connecting hole in a third direction and extends into the sealing cavity 120a, thereby dripping the aerosol generation matrix liquid droplets onto the test surface of the heating element 200 in the sealing cavity 120a.

[0063] In one specific embodiment, the liquid dispensing unit 164 further includes a driving module, a needle tube, and a push rod. The liquid dispensing needle is installed outside one end of the needle tube, and one end of the push rod is inserted into the needle tube and connected to the driving module for transmission. The aerosol generation matrix is ​​stored in the needle tube. The driving module can drive one end of the push rod to move inside the needle tube, so that the aerosol generation matrix drips through the liquid dispensing needle onto the test surface of the heating element 200.

[0064] Imaging unit 165 is mounted on the side of support 161 away from bracket 162 in a first direction. The imaging device is used to acquire images within the sealed cavity 120a, thereby obtaining the droplet penetration time based on the time it takes for the droplet to reach the test surface of the heating element 200 and the time it takes for the droplet to completely penetrate into the heating element 200. In a preferred embodiment, imaging unit 165 includes a camera with adjustable angle and focal length, thereby obtaining clearer images.

[0065] In some embodiments, the testing device 160 further includes a light-emitting unit 166, which is located on the side of the testing fixture 120 away from the imaging unit 165 in a first direction and is mounted on the bracket 162. The light-emitting unit 166 is used to provide illumination to the testing fixture 120, thereby improving the imaging clarity of the imaging unit 165 and facilitating observation by the experimenter.

[0066] In a preferred embodiment, the test apparatus 160 also includes an auxiliary light-emitting unit, which is mounted on one side of the support base 161 in the second direction. The auxiliary light-emitting unit is used to provide an auxiliary light source for the test fixture 120 so that the experimenter can observe it.

[0067] The aforementioned test fixture 120 and test system 100, through the cooperation of the test fixture 120 and the negative pressure device 140, simulate the real working scenario of the heating element 200 and provide a negative pressure environment for the heating element 200, thereby achieving precise negative pressure control and visual observation of the seepage process. At the same time, while ensuring the fixed stability of the heating element 200, the test area has sufficient contact area, enabling rapid and accurate testing of the seepage rate of the heating element 200.

[0068] Combination Figure 1 , Figure 2 , Figure 4 as well as Figure 5 As shown, this application also provides a method for testing the seepage rate using the above-described testing system 100. The seepage rate testing method specifically includes the following steps:

[0069] Step S110: Adjust the real-time pressure in the sealing cavity to the preset pressure value.

[0070] Specifically, after the heating element 200 is positioned on the test fixture 120 on the mounting platform 163, the vacuum unit 141 is activated and the flow control unit 143 is adjusted to perform a vacuum operation on the test fixture 120. Simultaneously, the reading of the pressure detection unit 145 is observed until the real-time pressure within the sealed cavity 120a reaches a preset pressure value. In a preferred embodiment, the preset pressure value is -500 Pa. In some embodiments, the angle and focal length of the imaging unit 165 can also be adjusted to facilitate subsequent observation and recording.

[0071] Thus, by using the negative pressure device 140 to create a negative pressure environment in the sealed cavity 120a of the test fixture 120, the actual pressure environment of the heating element 200 when it is working in the atomizing device can be simulated, ensuring the reliability of the test data.

[0072] Step S120: Drop the liquid onto the heating element inside the sealed cavity.

[0073] Specifically, when the real-time pressure value in the sealed cavity 120a of the test fixture 120 reaches the preset pressure value, the liquid addition unit 164 drips aerosol onto the test surface of the heating element 200 to generate matrix droplets.

[0074] Step S130: Obtain the penetration time ΔT from the initial contact of the droplet with the heating element to the complete absorption of the droplet by the heating element;

[0075] Specifically, after the liquid addition unit 164 drops liquid into the heating element 200, the imaging unit 165 acquires the time point T1 when the droplet initially contacts the heating element 200 and the time point T2 when the droplet is completely absorbed by the heating element 200, and then calculates the difference between the two time points to obtain the penetration time ΔT.

[0076] Step S140: Obtain the seepage rate υ of the heating element according to the formula υ=V / △T (μL / s); where V is the volume of the droplet.

[0077] After obtaining the infiltration time ΔT of the droplet on the heating element 200, since the volume of the droplet dripping from the heating unit 164 is constant, the infiltration rate of the heating element 200 can be obtained according to the formula υ=V / ΔT. In some embodiments, during the above process, the light-emitting unit 166 and the auxiliary light-emitting unit 166 can be turned on to facilitate imaging and observation.

[0078] The above-mentioned seepage rate test method can simulate the pressure state of the environment in which the heating element 200 is actually working, so that the test results are closer to the actual performance of the heating element 200. Moreover, it can record the seepage rate of the heating element 200 in real time with an accuracy of 0.1 μL / s.

[0079] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0080] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A test fixture for testing the penetration rate of a heating element, characterized in that, The test fixture includes: The base has a receiving groove for accommodating the heating element; A sealing cover, mounted on the base, defines a sealing cavity between the base and the sealing cover that communicates with the receiving groove; and A fixing member, supported on the base, partially covers the opening end of the receiving groove to abut against the heating element.

2. The test fixture according to claim 1, characterized in that, The fixing member and the base are attracted to each other under the action of magnetic force.

3. The test fixture according to claim 2, characterized in that, The base is provided with a first adsorption element, and the fixing element is provided with a second adsorption element. The first adsorption element and the second adsorption element attract each other under the action of magnetic force.

4. The test fixture according to claim 1, characterized in that, The test fixture also includes a sealing ring, which is located at the connection between the base and the sealing cover, and is used to seal the gap between the base and the sealing cover.

5. The test fixture according to claim 1, characterized in that, The sealing cover is made of a transparent material.

6. A testing system, characterized in that, The testing system includes the test fixture as described in any one of claims 1 to 5, and further includes: A negative pressure device is connected to the sealed cavity of the test fixture, the negative pressure device being used to create a negative pressure environment in the sealed cavity; and A testing device for dripping liquid droplets into the sealed cavity.

7. The testing system according to claim 6, characterized in that, The negative pressure device includes a vacuum pump and a mass flow meter. The vacuum pump is connected to the sealed cavity through the mass flow meter. The vacuum pump is used to extract gas from the sealed cavity, and the mass flow meter is used to control the airflow between the vacuum pump and the sealed cavity.

8. The testing system according to claim 6, characterized in that, The negative pressure device includes a differential pressure gauge, which is used to detect the pressure inside the sealed cavity.

9. The testing system according to claim 6, characterized in that, The testing apparatus includes: The installation platform, on which the test fixture is supported; A liquid dispensing unit includes a dispensing needle that extends into the sealed cavity and is used to dispense liquid droplets into the sealed cavity; and A camera is located on one side of the test fixture, and the camera is used to acquire images inside the sealed cavity.

10. The testing system according to claim 9, characterized in that, The testing device also includes a light-emitting unit, which is located on one side of the testing fixture.

Images