A type of environmental test chamber test hole blockage

Abstract

This utility model relates to the field of environmental testing technology for electronic product reliability, and discloses a test hole plug for an environmental test chamber, suitable for clamping common data cables, signal cables, and power cables. Its features include a frustum-shaped conical body, with a slit in the middle of the body that approximates a sine curve or is shaped like a sine curve, dividing the body into upper and lower parts that can be radially offset from each other; the cross-sectional area S of the cable clamped by the slit is... c The flow area S of the dividing seam g The ratio K is 0.7-1.5. Even with a large number of test cables, it can effectively reduce the gap between the cables and the sealing device, thereby significantly improving the airtightness of the environmental test chamber, reducing air leakage caused by a large number of test cables, and effectively preventing condensation and frost near the test holes of the test chamber, thus improving the quality of product testing and the working efficiency of the environmental test chamber.

Description

Technical Field

[0001] This utility model relates to the field of environmental testing technology for the reliability of electronic products, and in particular to a method for blocking test holes in an environmental test chamber. Background Technology

[0002] Environmental testing involves exposing products to specific environmental conditions to evaluate their functionality and performance during actual transportation, storage, and operation. Environmental testing provides crucial information about product quality and is an important means of quality assurance. Temperature is one of the most important factors. During environmental testing, it is essential to ensure the airtightness of the environmental test chamber during use and to guarantee the temperature stability inside the chamber. Therefore, improving the effectiveness of blocking the test holes in environmental test chambers is of great significance.

[0003] Currently, traditional test port plugging devices mostly use an integral rubber plug design, which performs well when dealing with a small number of cables. However, when dealing with a large number of test cables, this device cannot ensure a complete seal between each cable and the plug, resulting in potential gas leakage around the test ports of the test chamber. Due to the inadequate seal, the gas near the test ports is prone to condensation and frosting at low temperatures. This situation directly affects the overall airtightness of the environmental test chamber, and also negatively impacts product testing quality and the working efficiency of the environmental test chamber. Utility Model Content

[0004] To address the existing problems, this utility model provides a solution for clogging test holes in environmental test chambers, which effectively solves the problem of gaps between traditional test cables and blockages, and can be widely used for clogging test holes in environmental test chambers.

[0005] To achieve the above objectives, the present invention provides the following technical solution.

[0006] An environmental test chamber test hole plug, suitable for clamping common data cables, signal cables, and power cables, is characterized by comprising a frustum-shaped body, wherein the middle of the body is provided with an approximately sinusoidal or sinusoidal curve-shaped dividing slit, dividing the body into upper and lower parts that can be radially offset from each other, referred to as the upper part and the lower part; the ratio K between the cross-sectional area Sc of the cable clamped by the dividing slit and the flow area Sg of the dividing slit is 0.7-1.5.

[0007] As a further improvement of this utility model, the cross-sectional area S of the cable held by the dividing slit is... c For π·r 2 The diameter r of the clamped cable is 2mm-15mm; the flow area S of the dividing slit is... gThe average diameter D of the truncated cone at the dividing seam is 160mm-200mm, and the vertical distance A between the wave-like peaks and valleys or between the peaks and valleys of the dividing seam is 5mm-8mm.

[0008] As a further improvement of this utility model, the waveform period of the dividing slit is 3-4 cycles.

[0009] As a further improvement of this utility model, it also includes degreased cotton; the degreased cotton is disposed between the upper part and the lower part.

[0010] As a further improvement of this utility model, the degreased cotton is disposed between the cable and the upper part or the cable and the lower part.

[0011] As a further improvement of this utility model, it also includes a top pull ring; the top pull ring is disposed on the wider end of the body.

[0012] As a further improvement of this utility model, the diameter of the top pull ring is 45-60 mm.

[0013] As a further improvement of this utility model, the top pull ring is flexibly connected to the frustum-shaped body.

[0014] As a further improvement of this utility model, the frustum-shaped body is made of high-temperature resistant silicone material.

[0015] As a further improvement of this utility model, the maximum safe stretchability of the silicone material is greater than or equal to 300%.

[0016] This utility model has the following beneficial effects: This blocking structure can adapt to the clamping needs of various cables, including common data cables, signal cables, and power cables. Through the relatively movable upper and lower sections and a specific area ratio design, it ensures effective cable clamping while maintaining a certain flow area. This prevents excessive clamping from affecting the cable's normal function or insufficient clamping from causing poor sealing, improving the versatility and sealing effect of the test hole plugging, and ensuring the isolation of temperature and humidity within the environmental test chamber from the external environment. Even with a large number of test cables, it effectively reduces the gap between the cables and the sealing device, significantly improving the airtightness of the environmental test chamber. This reduces air leakage caused by a large number of test cables and effectively prevents condensation and frost near the test holes, improving the quality of product testing and the efficiency of the environmental test chamber. Furthermore, through an optimized sinusoidal curve dividing slit design, this invention can adapt to different numbers and diameters of test cables, greatly enhancing the versatility and flexibility of the device. It optimizes the fit between the test hole plugging device and the test cable without sacrificing the sealing effect, ensuring stability during long-term testing.

[0017] Preferably, the size of the dividing slit can be selected according to the diameter of different cables to ensure tightness and sealing, while facilitating quality control during the manufacturing process and improving the stability and reliability of the product.

[0018] Preferably, a suitable waveform period can optimize the elasticity and deformation capacity of the dividing slit; when clamping the cable, it can make the upper and lower parts fit the cable surface better, while ensuring that the dividing slit can deform evenly when subjected to external force or cable movement, avoiding stress concentration, extending the service life of the test hole blockage, and further improving the sealing effect.

[0019] Preferably, the degreased cotton has good moisture absorption and sealing properties. Placed between the upper and lower sections, it can fill any tiny gaps that may exist, further enhancing the sealing effect and preventing gas or liquid leakage from the environmental test chamber. It can also absorb any moisture or impurities that may enter, protecting cables and test holes from clogging the internal structure.

[0020] Preferably, this arrangement allows the degreased cotton to contact the cable more directly, better conforming to the cable surface and filling the gap between the cable and the test hole plug, further improving sealing performance. Simultaneously, the degreased cotton also acts as a buffer, reducing cable wear caused by vibration or movement during testing. Preferably, the top pull ring provides an easy point of leverage for the operator, facilitating the installation and removal of the test hole plug. When cable replacement or equipment maintenance is required, the test hole plug can be quickly and easily removed or inserted, improving work efficiency and reducing operational difficulty.

[0021] Preferably, the top pull ring made of flexible material is safer during use, preventing scratches or impact injuries to operators. At the same time, the flexible material has a certain degree of elasticity, better adapting to different operating forces and angles, improving comfort and convenience of use.

[0022] Preferably, the diameter of the top pull ring is 45-60 mm, which is suitable for the finger size of an adult.

[0023] Preferably, the flexible connection makes the top pull ring safer during use, preventing scratches or collision injuries to operators.

[0024] Preferably, the high-temperature resistant silicone material enables the test hole plug to maintain good physical properties and chemical stability under high-temperature environments, without deforming, softening, or releasing harmful substances due to temperature increases. This makes the test hole plug suitable for various high-temperature environmental tests, expanding its application range while ensuring the accuracy and safety of the tests.

[0025] Preferably, a higher maximum safe elongation rate means that the test hole plug can undergo significant deformation without damage when subjected to external force or temperature changes. This allows the test hole plug to better adapt to variations in the size and shape of different cables, as well as situations such as cable movement or expansion that may occur during testing. The maximum safe elongation rate of the silicone material is greater than or equal to 300%, ensuring that the silicone plug has sufficient elasticity for insertion or removal, and maintaining good clamping and sealing effects during insertion, thus improving the product's adaptability and reliability. Attached Figure Description

[0026] The accompanying drawings described herein are for illustrative purposes only and do not limit the scope of this invention in any way. Furthermore, the shapes and proportions of the components in the drawings are merely schematic to aid in understanding the invention and do not specifically limit the shapes and proportions of the components. In the drawings: Figure 1 This is a cross-sectional view of a test hole blockage in an environmental test chamber as described in Example 1; Figure 2 This is a front view of a test hole blockage in an environmental test chamber as described in Example 1; Figure 3 This is a side view of a test hole blockage in an environmental test chamber as described in Example 1; Among them, 1. the main body; 2. the upper part; 3. the lower part; 4. the dividing seam. Detailed Implementation

[0027] To enable those skilled in the art to better understand the technical solutions of this utility model, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of this utility model.

[0028] It should be noted that when an element is referred to as being "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only embodiments.

[0029] Unless otherwise defined below, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0030] Example 1 like Figure 1-3 As shown, an environmental test chamber test hole plug is suitable for clamping common data cables, signal cables, and power cables. It includes a frustum-shaped body with an approximately sinusoidal or sinusoidal dividing slit in the middle of the body, dividing the body into upper and lower parts that can be radially offset from each other. The ratio K between the cross-sectional area Sc of the cable clamped by the dividing slit and the flow area Sg of the dividing slit is 0.7-1.5.

[0031] The cross-sectional area S of the cable held by the dividing slit c For π·r 2 The diameter r of the clamped cable is 2mm-15mm; the flow area S of the dividing slit is... g The average diameter D of the truncated cone at the dividing seam is 160mm-200mm, which is (π·D·A) / 2.

[0032] The flow area S of the sinusoidal dividing slit g With cable cross-sectional area S c The mathematical model and relational expression between them are as follows: The circumference of the frustum of cones at the location of the sine curve dividing seam is: L=π·D(1) In the formula, L represents the circumference of the frustum at the location of the dividing seam, in mm; π is the ratio of pi to π, approximately equal to 3.1416; and D represents the average diameter of the frustum at the dividing seam, in mm.

[0033] The average width W of the sine curve dividing seam g The derivation can be based on the following principles: For a sine curve, the vertical distance from its crest to its trough is A. Under natural conditions, the "average width" of this gap can be approximated as half the peak value A. g The mathematical average is (2 / π)·A≈0.6366·A. To simplify the model and retain a certain safety margin, its geometric mean width is usually taken as A / 2, that is: W g = A / 2(2) In the formula, W gA represents the average width of the sine curve dividing joint, in mm; A is the peak value of the sine curve dividing joint, in mm.

[0034] The flow area S of the sinusoidal dividing slit g It can be estimated as: S g ≈ L·W g (3) In the formula, S g This represents the flow area of ​​the sinusoidal slit, indicating the effective minimum flow area of ​​the slit in its natural state (uncompressed), expressed in mm. 2 L represents the circumference of the frustum at the location of the dividing seam, in mm; W g This represents the average width of the sine curve dividing the gap, in mm.

[0035] Therefore, the flow area S of the sinusoidal dividing slit g : S g ≈L·W g = (π·D)·A / 2 = (π·D·A) / 2(4) In the formula, D represents the average diameter of the truncated cone at the dividing seam, in mm; A is the peak value of the sine curve dividing seam, in mm; and π is pi, approximately equal to 3.1416.

[0036] To measure the effectiveness of the device's sealing performance, the flow area S of the sinusoidal segment is introduced. g With cable cross-sectional area S c The ratio is taken into consideration, that is: K= S c / S g = (2·S c ) / (π·D·A)(5) In the formula, K is the proportionality coefficient; S c Equivalent cross-sectional area of ​​cable, mm 2 D represents the average diameter of the truncated cone at the dividing seam, in mm; A is the peak value of the sine curve dividing seam, in mm; π is pi, approximately 3.1416. For the device to achieve an effective seal, the cable bundle must be appropriately "spread" open in the gap, utilizing the elastic recovery force of the silicone to achieve a seal. Therefore, the total cable area S... c The natural flow area S of the gap must be close to or even slightly larger than the gap itself. g .

[0037] Formula (5) represents the mutual constraints between the parameters: When K < 1: This indicates that the cable bundle is thin and can be easily inserted. The seal mainly relies on the external truncated cone being compressed and deformed when the device is inserted into the test hole, squeezing the cable and the dividing seam inward.

[0038] When K≈1; ideal state. The cable bundle fits perfectly into the natural gap, requiring slight force to insert. At this point, after inserting it into the test hole, the stress state inside (cable spread) and outside (hole wall compression) is most balanced, resulting in the best sealing effect.

[0039] When K > 1, it means that the cable bundle is relatively thick and requires significant force to press it into the dividing seam. At this time, the device exerts a great constraint on the cable. However, the K value cannot be too large, otherwise it will lead to excessive silicone stress, which may cause problems such as air leakage, difficulty in installation, or affect the life of the device.

[0040] Calculations and practical verification show that when K=0.7-1.5, the device is in its optimal operating range and has the best sealing effect.

[0041] Preferably, the waveform period N of the dividing seam is 3-4.

[0042] N represents the number of periods of the sinusoidal segmentation curve used. It is a stability optimization parameter that does not directly affect the area, but directly affects the reliability and uniformity of the seal.

[0043] The role of the N-value is to ensure that, regardless of the cable bundle's position within the gap, it is adequately wrapped and compressed from multiple directions by the numerous "crests" and "troughs," preventing situations where the cable is biased to one side while the other side remains poorly sealed. It also ensures a uniform distribution of the clamping structure.

[0044] Determining the N value: The value of N is directly proportional to the average diameter D of the truncated cone at the dividing seam. A larger D results in a longer circumference, requiring more waveforms (a larger N) to maintain uniform clamping. N=3.5 ensures 3-4 effective clamping points on the entire circumference for a standard φ160mm test hole, preventing sealing dead zones. Insufficient sine wave counts (e.g., 2) lead to overly concentrated clamping points, easily creating sealing dead zones when clamping multiple cables. Furthermore, overly concentrated test cable bundles accelerate silicone fatigue aging due to concentrated clamping stress. Excessive waveform count weakens the clamping force of individual waveforms, hindering the device's ability to clamp wider diameter wires or bundles (φ35mm), potentially leading to insufficient clamping force on individual cables and incomplete seam closure causing air leakage. Testing revealed that with the standard size of this device (φ160mm), setting approximately 3.5 continuous waveforms can create a uniform and sufficient clamping point in the circumferential direction, ensuring that the cable is subjected to balanced elastic pressure from multiple directions regardless of its location in the split seam, thereby achieving a comprehensive and reliable seal.

[0045] The vertical distance A between the wave-like peaks and troughs, or between peaks and troughs, of the dividing seam is 5mm-8mm, preferably 6mm. This size range is based on statistical analysis of the diameters of common test cables (such as data cables, signal cables, and power cables). The diameter of a single cable is typically between φ2mm and φ15mm. The 6mm peak design ensures that when the upper and lower parts of the structure are stretched by the cable, the waveform surface can produce a sufficiently large and uniform elastic deformation. This allows it to tightly wrap around a single thick cable and adaptively fill irregular gaps between multiple cables, thus achieving surface contact rather than point contact and maximizing the contact area and airtightness.

[0046] Preferably, the frustum-shaped body is made of high-temperature resistant silicone material.

[0047] Preferably, the maximum safe stretchability of the silicone material is greater than or equal to 300%.

[0048] Preferably, the high-temperature resistant silicone material enables the test hole plug to maintain good physical properties and chemical stability under high-temperature environments, without deforming, softening, or releasing harmful substances due to temperature increases. This makes the test hole plug suitable for various high-temperature environmental tests, expanding its application range while ensuring the accuracy and safety of the tests. The maximum safe expansion rate of the silicone material is greater than or equal to 300%, giving the silicone plug sufficient elasticity for insertion or removal.

[0049] Example 2 The difference between this embodiment and Embodiment 1 is that: 1) It also includes absorbent cotton; the absorbent cotton is disposed between the upper part and the lower part.

[0050] 2) The degreased cotton is placed between the cable and the upper part or the cable and the lower part.

[0051] To further improve the airtightness of the test hole, this embodiment also discloses an auxiliary design to enhance airtightness: after the cable is placed into the split seam, a small amount of high and low temperature resistant sealing material, such as degreased cotton, can be added around the cable harness and to the wave-shaped recess of the split seam. Then, the entire device is inserted into the test hole to improve the airtightness of the device.

[0052] The operating principle of this embodiment: When plugging the test hole of the test chamber, the tester first passes the test cable through the test hole of the test chamber, and then lays the test cable relatively evenly on the arc-shaped curve division surface of the device. To achieve better airtightness, a small amount of high and low temperature resistant sealing material, such as degreased cotton, can be added around the cable harness and to the waveform recesses of the division seam. Then, the test cable is tightened from both sides through the two parts of the device, and then inserted into the test hole of the test chamber. Press firmly until the test cable fits well with the plugging device, thus completing the plugging of the test hole of the test chamber.

[0053] Example 3 The difference between this embodiment and Embodiment 1 is that: 1) It also includes a top pull ring; the top pull ring is disposed on the wider end of the body.

[0054] 2) The diameter of the top pull ring is 45-60 mm.

[0055] 3) The top pull ring is flexibly connected to the frustum-shaped body (1).

[0056] The top pull ring is located on the wider end of the body, which allows the operator to apply force from the outside of the plug hole, thus avoiding concentrated force on the smaller end of the body and preventing damage.

[0057] The top pull ring has a diameter of 45-60 mm, which is suitable for the finger size of an adult.

[0058] The flexible connection makes the top pull ring safer during use, preventing scratches or impact injuries to operators. Furthermore, the flexible connection can be made of silicone, a material with excellent flexibility, high-temperature resistance, and chemical stability. As the material for the top pull ring, it maintains stable performance under various environmental conditions, is not prone to aging, deformation, or damage, ensuring long-term reliability and safety. In addition, the smooth surface of silicone provides a comfortable feel, further enhancing the user experience.

[0059] The advantages of this utility model can be summarized as follows: 1. It has a simple and ingenious structure, low production cost, and is easy to use, requiring no tools to operate.

[0060] 2. The use of high-temperature resistant silicone material ensures long-term elasticity and durability under alternating high and low temperature conditions in the environmental test chamber.

[0061] 3. A specific waveform (sine curve) segmentation design creates excellent adaptive clamping and sealing capabilities, ensuring reliable sealing for single to multiple cables in various combinations.

[0062] 4. A redundant sealing scheme that can be used with fillers such as degreased cotton is creatively proposed, providing an option to enhance airtightness for more extreme and demanding test conditions. The design is comprehensive.

[0063] 5. It can achieve a good double fit between the plugging device and the inner wall of the test hole and the test cable, and the airtightness is far superior to traditional rubber plugs (such as integral rubber plugs). It effectively prevents air leakage, condensation and frost in the test hole of the test chamber, and ensures the accuracy of test conditions and the quality of the test sample.

[0064] The above embodiments are merely one of the implementation methods for achieving the technical solution of this utility model. The scope of protection claimed by this utility model is not limited to this embodiment, but also includes any variations, substitutions, and other implementation methods that are easily conceived by those skilled in the art within the scope of the technology disclosed in this utility model. Although embodiments of this utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of this utility model. The scope of this utility model is defined by the appended claims and their equivalents.

Claims

1. A test port plug for an environmental test chamber, suitable for clamping common data cables, signal cables, and power cables, characterized in that... The system includes a frustum-shaped body (1), with a slit (4) in the middle that is approximately sinusoidal or sinusoidal in shape, dividing the body (1) into upper and lower parts that can be radially offset, referred to as the upper part (2) and the lower part (3); the cross-sectional area S of the cable held by the slit (4) is... c The flow area S of the dividing seam (4) g The ratio K between them is 0.7-1.

5.

2. The method for blocking test holes in an environmental test chamber according to claim 1, characterized in that, The cross-sectional area S of the cable held by the dividing slit (4) c For π·r 2 The diameter r of the clamped cable is 2mm-15mm; the flow area S of the dividing slit (4) is... g The average diameter D of the truncated cone at the dividing seam (4) is 160mm-200mm, and the vertical distance A between the wave-like peaks and wave-like valleys or between the peaks and valleys of the dividing seam (4) is 5mm-8mm.

3. The method for blocking test holes in an environmental test chamber according to claim 2, characterized in that, The waveform period of the dividing seam (4) is 3-4.

4. The method for blocking test holes in an environmental test chamber according to claim 1, characterized in that, It also includes absorbent cotton; the absorbent cotton is disposed between the upper part (2) and the lower part (3).

5. The environmental test chamber test port plugging method according to claim 4, characterized in that, The degreased cotton is placed between the cable and the upper part (2) or the cable and the lower part (3).

6. The method for blocking test holes in an environmental test chamber according to claim 1, characterized in that, It also includes a top pull ring; the top pull ring is disposed on the wider end of the body (1).

7. The environmental test chamber test port blockage according to claim 6, characterized in that, The diameter of the top pull ring is 45-60 mm.

8. The environmental test chamber test port blockage according to claim 7, characterized in that, The top pull ring is flexibly connected to the frustum-shaped body (1).

9. The method for blocking test holes in an environmental test chamber according to claim 1, characterized in that, The frustum-shaped body (1) is made of high-temperature resistant silicone material.

10. A method for blocking test holes in an environmental test chamber according to claim 9, characterized in that, The maximum safe stretchability of the silicone material is greater than or equal to 300%.

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