A low-noise optical module three-temperature testing device

Abstract

This invention relates to a low-noise optical module three-temperature testing device, comprising a test box with a test cavity formed inside. An air inlet pipe is connected to the test box and communicates with the test cavity. A first silencing cavity is also formed inside the test box, and a first exhaust channel communicating with the first silencing cavity is provided on the test box. A duct is also connected to the test box, connecting the test cavity and the first silencing cavity. By setting up the first silencing cavity and connecting it to the test cavity via the duct, this invention not only extends the gas flow path within the test box and serves to store airflow, but also significantly increases the gas flow area and the diffuse reflection area and number of reflections within the test box, thereby reducing gas velocity and noise energy, achieving noise reduction. The test cavity-duct-first silencing cavity can form a Venturi effect, resulting in better noise reduction.

Description

Technical Field

[0001] This invention belongs to the field of optical module testing technology, specifically relating to a low-noise optical module three-temperature testing device. Background Technology

[0002] High, low, and ambient temperature testing is an essential process in the optical module industry, and its efficiency directly impacts the entire module production cycle. Currently, the industry primarily uses heat flow meters as the high and low temperature source for three-temperature testing. Heat flow meters use compressed air to blow hot and cold air onto the product to achieve the required test temperatures. However, insufficient sealing during testing leads to heat loss and excessive noise, which have become common problems in the industry. Noise pollution, in particular, has not been properly addressed in the optical module industry, making noise reduction an urgent priority. Existing noise reduction technologies for three-temperature testing mostly employ sealed covers, silencers, and sound-absorbing foam to achieve noise reduction, but the noise reduction effect is not very significant. Summary of the Invention

[0003] This invention relates to a low-noise optical module three-temperature testing device, which can at least solve some of the defects of the prior art.

[0004] This invention relates to a low-noise optical module three-temperature testing device, comprising a test box, a test cavity formed inside the test box, an air inlet pipe connected to the test box and communicating with the test cavity, a first silencing cavity also formed inside the test box, and a first exhaust channel communicating with the first silencing cavity provided on the test box, and a guide pipe connected to the test box and communicating with the first silencing cavity.

[0005] As one implementation method, at least one first muffler is provided on the test box to form the first exhaust passage.

[0006] As one implementation method, sound-absorbing foam and / or sound-absorbing shielding baffles are provided in the first sound-absorbing cavity.

[0007] As one embodiment, the test box is further provided with an optical module plug-in port communicating with the test cavity, a buffer cavity communicating with the optical module plug-in port, and a second silencing cavity communicating with the buffer cavity, and a second exhaust channel communicating with the second silencing cavity is provided on the test box.

[0008] As one embodiment, the test box includes a test base plate and an outer cover. The outer cover is hinged to the top of the test base plate and surrounds the test base plate to form the buffer cavity. The second noise-absorbing cavity is formed inside the test base plate. A flow guide hole is provided on the top surface of the test base plate, and the buffer cavity and the second noise-absorbing cavity are connected through the flow guide hole.

[0009] As one implementation method, the outer cover is provided with sound-absorbing foam and / or sound-absorbing shielding baffle.

[0010] As one implementation method, at least one second muffler is provided on the test box to form the second exhaust passage.

[0011] As one embodiment, the test box includes a test base plate, a test circuit board, and a module limiting seat. The test circuit board is mounted on the top surface of the test base plate, and the module limiting seat is mounted on the upper surface of the test circuit board and surrounds the test circuit board to form the test cavity. One side wall of the module limiting seat is provided with an optical module plug-in port, and the air inlet pipe and the air guide pipe are both connected to the module limiting seat.

[0012] As one implementation method, the connection between the module limiting seat and the test circuit board is sealed with sealant.

[0013] As one embodiment, the air intake pipe includes a sealing sleeve fixed on the test box and an air intake pipe body connected to the sealing sleeve by a pipe clamp, with a sealing gasket sandwiched between the sealing sleeve and the test box.

[0014] As one implementation method, at least some of the components near the test cavity are made of thermally conductive materials.

[0015] The present invention has at least the following beneficial effects: The low-noise optical module three-temperature testing device provided by the present invention, by setting a first silencing cavity and connecting the first silencing cavity and the testing cavity through a gas guide pipe, on the one hand, extends the gas flow path in the testing box, which can reduce the gas flow velocity and achieve a certain degree of noise reduction effect; on the other hand, it can significantly increase the gas flow area in the testing box, and correspondingly reduce the gas flow velocity (flow velocity = flow rate / flow cross-sectional area), thereby achieving the purpose of noise reduction; the first silencing cavity can play the role of storing airflow, allowing the airflow to transfer here and then slowly flow out, which not only reduces the airflow pressure, but also the incoming high-speed airflow impacts the stored gas, significantly improving the silencing effect; in addition, the gas guide pipe and the first silencing cavity also increase the sound diffuse reflection area and the number of reflections, thereby reducing noise energy. In particular, the test chamber-air duct-first silencer chamber can form a Venturi effect. When the gas enters the first silencer chamber from the air duct, the air pressure drops rapidly and the gas flow rate is significantly reduced. At the same time, within the test chamber, there is a negative pressure suction effect based on the Venturi effect, which can reduce the probability of gas colliding with the inner wall of the test chamber, thereby achieving the purpose of noise reduction and silencing. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the 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.

[0017] Figure 1 This is an isometric view of the low-noise optical module three-temperature testing device provided in an embodiment of the present invention;

[0018] Figure 2 This is an exploded structural diagram of the low-noise optical module three-temperature testing device provided in an embodiment of the present invention;

[0019] Figure 3 A schematic diagram of the first silencing cavity on the test base plate provided in an embodiment of the present invention;

[0020] Figure 4 A schematic diagram of the second silencing cavity on the test base plate according to an embodiment of the present invention;

[0021] Figure 5 This is a schematic diagram showing the outer cover being flipped up according to an embodiment of the present invention;

[0022] Figure 6 This is a schematic diagram of the airflow direction in the low-noise optical module three-temperature testing device provided in an embodiment of the present invention. Detailed Implementation

[0023] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] The applicant discovered that the main reason for the high noise level in the low-noise optical module three-temperature testing device is that when hot or cold air is blown into the device, the small airflow area inside the device results in a high air velocity, causing a loud impact sound when the gas hits the inner wall of the device, thus generating noise. The higher the airflow velocity, the louder the noise. In addition, the large number of test cables for testing bit errors makes it difficult to seal the entire device, leading to air leakage and generating whistling or shrill noise.

[0025] Accordingly, such as Figures 1-6This invention provides a low-noise optical module three-temperature testing device, including a test box, a test cavity 11 formed inside the test box, an air inlet pipe 5 connected to the test box and communicating with the test cavity 11, a first silencing cavity 12 also formed inside the test box, and a first exhaust channel communicating with the first silencing cavity 12 provided on the test box, and a guide pipe 6 connected to the test box and communicating with the test cavity 11 and the first silencing cavity 12.

[0026] In one embodiment, such as Figure 1 and Figure 2 The aforementioned test box includes a test base plate 1, a test circuit board 2, and a module limiting seat 3. The test circuit board 2 is mounted on the top surface of the test base plate 1, and the module limiting seat 3 is mounted on the upper surface of the test circuit board 2 and surrounds the test circuit board 2 to form the test cavity 11. One side wall of the module limiting seat 3 is provided with an optical module insertion port 31. The air inlet pipe 5 and the air guide pipe 6 are both connected to the module limiting seat 3.

[0027] The first silencing cavity 12 is formed inside the test base plate 1; the first exhaust channel is also set on the test base plate 1.

[0028] In one embodiment, at least one first muffler 71 is provided on the test box to form the first exhaust channel; in the above-mentioned scheme in which the first exhaust channel is provided on the test base plate 1, the first muffler 71 is correspondingly installed on the test base plate 1; preferably, multiple first mufflers 71 are provided, which can improve the muffler effect.

[0029] The low-noise optical module three-temperature testing device provided in this embodiment, by setting a first silencing cavity 12 and connecting the first silencing cavity 12 and the testing cavity 11 through the air guide pipe 6, on the one hand, extends the gas flow path in the testing box, which can reduce the gas flow velocity and achieve a certain degree of noise reduction effect. On the other hand, it can significantly increase the gas flow area in the testing box, and correspondingly reduce the gas flow velocity (flow velocity = flow rate / flow cross-sectional area), thereby achieving the purpose of noise reduction. The first silencing cavity 12 can store airflow, allowing the airflow to transfer here and then flow out slowly. This not only reduces the airflow pressure, but also ensures that the incoming high-speed airflow impacts the stored air, significantly improving the silencing effect. In addition, the air guide pipe 6 and the first silencing cavity 12 also increase the sound diffuse reflection area and the number of reflections, thereby reducing noise energy. In particular, the test chamber 11-air guide tube 6-first silencer chamber 12 can form a Venturi effect. When the gas enters the first silencer chamber 12 from the air guide tube 6, the gas pressure drops rapidly and the gas flow rate is significantly reduced. At the same time, the test chamber 11 has a negative pressure suction effect based on the Venturi effect, which can reduce the probability of gas colliding with the inner wall of the test chamber 11, thereby achieving the purpose of noise reduction and silencing.

[0030] Preferably, a sound-absorbing foam 8 and / or a sound-absorbing shielding baffle are provided in the first sound-absorbing cavity 12 to further improve the sound-absorbing effect; the sound-absorbing foam 8 is preferably fixed on the cavity wall of the first sound-absorbing cavity 12, for example, by adhesive bonding or other installation methods.

[0031] In one embodiment, such as Figure 1 and Figure 2 A quick-connect tracheal connector 63 is provided on the test box, and the air tube 6 is connected to the quick-connect tracheal connector 63, which enables quick installation and removal of the air tube 6. For the above-mentioned structure including the module limiting seat 3, the quick-connect tracheal connector 63 is correspondingly provided on the module limiting seat 3.

[0032] In one embodiment, such as Figure 1 and Figure 2 The air guide pipe 6 includes a main air guide pipe 61 and two branch air guide pipes 62. The main air guide pipe 61 is connected to the test chamber 11, and the two branch air guide pipes 62 are respectively connected to the first silencing chamber 12. Based on this design, on the one hand, the cross-sectional area of ​​gas flow can be increased and the gas flow velocity can be reduced. On the other hand, the two airflows entering the first silencing chamber 12 can not only improve the uniformity of gas flow in the first silencing chamber 12 and reduce the noise caused by uneven airflow, but also the collision of the two airflows can further reduce the gas flow velocity and reduce noise.

[0033] In one embodiment, such as Figure 2 and Figure 6 The air intake pipe 5 includes a sealing sleeve 52 fixed to the test box and an air intake pipe body 51 connected to the sealing sleeve 52 via a pipe clamp. A sealing gasket 53 is sandwiched between the sealing sleeve 52 and the test box. The sealing sleeve 52 and the test box can be detachably connected using screws or other fixing methods. In a design with a module limiting seat 3, the sealing sleeve 52 is connected to the module limiting seat 3. Preferably, the air intake pipe body 51 is a flexible hose, which can be fixed to the sealing sleeve 52 using a hose clamp or other fastener. This structure ensures the sealing performance of the air intake pipe 5 and the connection between the air intake pipe 5 and the test box, preventing noise and insufficient test temperature due to inadequate sealing.

[0034] Optionally, the connector connecting the air duct 6 to the first silencer chamber 12 is a silencer-type connector 64, which can further reduce noise. The silencer-type connector 64 is installed on the aforementioned test base plate 1.

[0035] In this embodiment, the test cavity 11 is formed by the test circuit board 2 and the module limiting seat 3. The structure is simple, and there is no need to make an additional test cavity 11, which can reduce the size and manufacturing cost of the test device. Moreover, the test circuit board 2 is arranged on the top of the test base plate 1, and the module limiting seat 3 can only partially block the test circuit board 2, which facilitates the wiring and connection of related cables and avoids the occurrence of additional noise due to wiring and other reasons.

[0036] The test circuit board 2 is preferably detachably mounted on the test base plate 1, for example, by fixing it with screws. The module limiting seat 3 is preferably detachably fixed to the test circuit board 2, for example, by fixing it with screws. In this way, the corresponding module limiting seat 3 can be matched according to the optical module being tested, which can effectively expand the applicability of this device and reduce the testing cost of optical modules for enterprises.

[0037] Furthermore, the connection between the module limiting seat 3 and the test circuit board 2 is sealed with sealant to improve the airtightness of the test chamber 11 and prevent noise and failure to meet test temperature requirements due to insufficient sealing. Optionally, sealant is applied to the bottom of the module limiting seat 3 before connecting the module limiting seat 3 and the test circuit board 2; the sealant includes, but is not limited to, EMI shielding adhesive.

[0038] Further optimize the structure of the aforementioned low-noise optical module three-temperature testing device, such as... Figures 4-6 The test box is also provided with an optical module plug-in port 31 connected to the test cavity 11, a buffer cavity 15 connected to the optical module plug-in port 31, and a second silencing cavity 13 connected to the buffer cavity 15. A second exhaust channel connected to the second silencing cavity 13 is provided on the test box.

[0039] In the design where the test box includes a test base plate 1, the second silencing cavity 13 is preferably formed within the test base plate 1. Further, the test box also includes an outer cover 4, which is hinged to the top of the test base plate 1 and forms the buffer cavity 15 with the test base plate 1. A flow guide hole 14 is provided on the top surface of the test base plate 1, through which the buffer cavity 15 and the second silencing cavity 13 are connected.

[0040] In one embodiment, the outer cover 4 is hinged to the module limiting seat 3, which facilitates installation and ensures the sealing of the connection between the outer cover 4 and the module limiting seat 3.

[0041] On the one hand, by flipping the outer cover 4, the insertion and removal of the optical module can be facilitated, thus improving testing efficiency; on the other hand, by forming a buffer cavity 15, the gas flowing out through the gap between the optical module and the optical module insertion port 31 can be captured, and then through corresponding noise reduction treatment, the noise on site can be further reduced.

[0042] Similarly, by setting up the second silencing chamber 13, the gas flow path within the test box can be extended, reducing the gas flow velocity and achieving a certain degree of noise reduction. Furthermore, it significantly increases the gas flow area within the test box, correspondingly reducing the gas flow velocity and thus achieving noise reduction. The aforementioned buffer chamber 15 and the first silencing chamber 12 can store airflow, allowing it to transit here before slowly flowing out. This not only reduces the airflow pressure but also ensures that the incoming airflow impacts the stored air, thereby improving the silencing effect. Additionally, the air duct 6 and the first silencing chamber 12 also increase the diffuse reflection area and the number of reflections, thereby reducing noise energy.

[0043] In particular, the buffer chamber 15-guide hole 14-second silencer chamber 13 can form a Venturi effect. When the gas enters the second silencer chamber 13 from the guide hole 14, the gas pressure drops rapidly and the gas flow rate is significantly reduced. At the same time, the buffer chamber 15 has a negative pressure suction effect based on the Venturi effect, which can quickly discharge the gas and achieve the purpose of noise reduction and silencing.

[0044] The guide holes 14 are preferably multiple, which can increase the cross-sectional area of ​​gas flow and reduce the gas flow velocity. On the other hand, it can improve the uniformity of gas flow in the second silencer cavity 13. Moreover, the collision of multiple airflows can further reduce the gas flow velocity and reduce noise.

[0045] Among them, a wire hole can be provided on the outer cover 4 to facilitate the wiring of test cables, etc. Since less gas enters the buffer chamber 15, less gas leaks out through the wire hole, the noise can be ignored, and the wire hole is also easy to seal.

[0046] Preferably, the outer cover 4 is provided with sound-absorbing foam 8 and / or sound-absorbing shielding baffle, which can further reduce noise.

[0047] In one embodiment, at least one second muffler 72 is provided on the test box to form the second exhaust channel; in the scheme where the second exhaust channel is provided on the test base plate 1, the second muffler 72 is correspondingly installed on the test base plate 1; preferably, multiple second mufflers 72 are provided to improve the muffler effect.

[0048] In one embodiment, at least a portion of the components near the test cavity 11 are made of a thermally conductive material, including but not limited to at least one of the following:

[0049] The aforementioned module limit seat 3 is made of thermally conductive material;

[0050] The cavity wall of the first silencing cavity 12, which is close to the test cavity 11, is made of thermally conductive material;

[0051] The wall of the buffer chamber 15 near the test chamber 11 is made of thermally conductive material.

[0052] Based on the above solution, during the three-temperature test, the test box can be rapidly cooled down during the cooling phase, shortening the cooling time and improving the testing efficiency.

[0053] The aforementioned thermally conductive materials include, but are not limited to, metals or related materials with good thermal conductivity, such as brass, aluminum alloys, stainless steel, and aluminum nitride.

[0054] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A low-noise optical module three-temperature testing device, comprising a test box, wherein a test cavity is formed inside the test box, and an air inlet pipe is connected to the test box, the air inlet pipe communicating with the test cavity, characterized in that: The test box also has a first silencing cavity, and a first exhaust channel communicating with the first silencing cavity is provided on the test box. A guide pipe is also connected to the test box, and the guide pipe communicates the test cavity with the first silencing cavity. The test box includes a test base plate, a test circuit board, and a module limiting seat. The test circuit board is mounted on the top surface of the test base plate, and the module limiting seat is mounted on the upper surface of the test circuit board and surrounds the test circuit board to form the test cavity. One side wall of the module limiting seat is provided with an optical module plug-in port. The air inlet pipe and the air guide pipe are both connected to the module limiting seat. The air guide tube includes a main air guide tube and two branch air guide tubes. The main air guide tube is connected to the test chamber, and the two branch air guide tubes are respectively connected to the first silencer. The airflow introduced by the two branch air guide tubes can collide with each other in the first silencer. The test box is also provided with a buffer cavity communicating with the optical module plug-in port and a second silencing cavity communicating with the buffer cavity, and a second exhaust channel communicating with the second silencing cavity is provided on the test box.

2. The low-noise optical module three-temperature testing device as described in claim 1, characterized in that: At least one first muffler is provided on the test box to form the first exhaust passage.

3. The low-noise optical module three-temperature testing device as described in claim 1, characterized in that: The first silencing cavity is provided with sound-absorbing foam and / or sound-absorbing shielding baffle.

4. The low-noise optical module three-temperature testing device as described in claim 1, characterized in that: The test box includes a test base plate and an outer cover. The outer cover is hinged to the top of the test base plate and forms the buffer cavity with the test base plate. The second noise reduction cavity is formed inside the test base plate. A flow guide hole is provided on the top surface of the test base plate, and the buffer cavity and the second noise reduction cavity are connected through the flow guide hole.

5. The low-noise optical module three-temperature testing device as described in claim 4, characterized in that: The outer cover is equipped with sound-absorbing foam and / or sound-absorbing shielding baffles.

6. The low-noise optical module three-temperature testing device as described in claim 1, characterized in that: At least one second muffler is provided on the test box to form the second exhaust passage.

7. The low-noise optical module three-temperature testing device as described in claim 1, characterized in that: The air intake pipe includes a sealing sleeve fixed on the test box and an air intake pipe body connected to the sealing sleeve by a pipe clamp, and a sealing gasket is sandwiched between the sealing sleeve and the test box.

8. The low-noise optical module three-temperature testing device as described in claim 1, characterized in that: At least some of the components near the test chamber are made of thermally conductive materials.

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