An elastic thermocouple capable of SMT welding

Abstract

The utility model discloses an elastic thermocouple capable of SMT welding, comprising a thermocouple temperature sensing line and a temperature measuring head arranged at one end of the thermocouple temperature sensing line, characterized in that it also comprises a compressible elastic body and an FPC board bent into a U shape, the plates at both ends of the FPC board are respectively fitted and fixed with the upper and lower ends of the elastic body, the temperature measuring head at one end of the thermocouple temperature sensing line is fixed on the plate body of the FPC board at the upper end of the elastic body, and the other end of the thermocouple temperature sensing line is connected to an SMT pad, and the SMT pad is mounted and fixed on the plate body of the FPC board at the lower end of the elastic body. The elastic thermocouple capable of SMT welding of the utility model can be conveniently installed on the internal circuit board of an optical module or an active copper cable product by SMT welding together with other electronic components, and stably and reliably contacts the product shell for temperature measurement.

Description

Technical Field

[0001] The utility model relates to an elastic thermocouple capable of SMT welding. Background Art

[0002] Optical modules and active copper cables are high-power, heat-generating devices currently used in the communications industry. According to the packaging form, common products include SFP, QSFP, QSFP-DD, OSFP, etc., Gigabit Ethernet interface converter (GBIC), etc. With the significant increase in the transmission speed of optical modules and active copper cables, the power consumption of the modules has also increased, which has also brought about the necessary requirements for heat generation and temperature monitoring. At present, in addition to the temperature of the chip on the internal circuit board of the above products, the temperature of the external shell also needs to be monitored.

[0003] The known optical modules and active copper cable products use the following method to monitor the temperature of the shell: a temperature sensing chip is set on the internal circuit board, and a thermocouple temperature sensing wire is welded on the temperature sensing chip. The temperature measuring head at the end of the thermocouple temperature sensing wire is manually glued to the inner wall of the shell with glue or tape to measure the shell temperature. However, the current method of measuring the shell temperature has the following problems:

[0004] 1. The reliability of glue or tape in fixing the temperature measuring terminal is poor. Over time, the adhesive force of the glue or tape will weaken, causing the temperature measuring terminal to separate from the shell or incomplete contact, thus affecting the temperature detection accuracy.

[0005] 2. Glue or tape is easy to fall off and fail at high temperature, and may cause short circuit of circuit board.

[0006] 3. Thermocouple temperature sensing wires cannot be installed on the circuit board by SMT welding together with other electronic components on the circuit board. Instead, they need to be manually welded to the circuit board, which has a complex process and low stability. Summary of the invention

[0007] The purpose of the utility model is to overcome the above problems existing in the prior art and to provide an elastic thermocouple that can be SMT welded, which can be conveniently SMT welded together with other electronic components and installed on the internal circuit board of an optical module or an active copper cable product, and stably and reliably contact the product casing for temperature measurement.

[0008] The technical solution of the utility model is: an elastic thermocouple that can be SMT welded, including a thermocouple temperature-sensing wire and a temperature measuring head arranged at one end of the thermocouple temperature-sensing wire, characterized in that it also includes a compressible elastic body and an FPC board bent into a U shape, the plate bodies at both ends of the FPC board are respectively fitted and fixed with the upper and lower ends of the elastic body, the temperature measuring head at one end of the thermocouple temperature-sensing wire is fixed on the plate body of the FPC board at the upper end of the elastic body, and the other end of the thermocouple temperature-sensing wire is connected to the SMT pad, and the SMT pad is mounted and fixed on the plate body of the FPC board at the lower end of the elastic body.

[0009] The FPC (Flexible Printed Circuit) board in the present invention refers to the existing flexible printed circuit board.

[0010] Furthermore, the FPC board in the utility model includes a parallel upper plate body and a lower plate body, and a connecting plate body integrally connecting the upper plate body and the lower plate body, wherein the upper plate body is fixed to the upper end of the elastic body, the temperature measuring head is mounted and fixed to the upper part of the upper plate body by SMT, and the lower plate body is fixed to the lower end of the elastic body, and the SMT pad is mounted and fixed to the lower part of the lower plate body.

[0011] More preferably, in the utility model, an upper reinforcing plate is bonded and fixed between the upper plate body and the upper end of the elastic body, and a lower reinforcing plate is bonded and fixed between the lower plate body and the lower end of the elastic body.

[0012] More preferably, the thermocouple temperature sensing wire in the present invention is a flat wire attached to the connecting plate body.

[0013] More preferably, the upper reinforcing plate in the present invention is a PI board or a FR4 board, and the lower reinforcing plate is also a PI board or a FR4 board.

[0014] Furthermore, the thermocouple temperature sensing wires in the present invention are two, namely a positive wire and a negative wire, one end of each of which is connected to the temperature measuring head, and the other end of each of which is connected to the two SMT pads respectively.

[0015] Furthermore, the elastic body in the utility model is made of rubber, silicone or PU.

[0016] When the utility model is actually used, the SMT pad at the lower end of the elastomer is soldered and installed on the temperature sensing chip of the internal circuit board of the optical module or the active copper cable by SMT method, and the temperature measuring head of the thermocouple temperature sensing wire at the upper end of the elastomer is in contact with the inner wall of the outer shell of the optical module or the active copper cable, thereby realizing the measurement and monitoring of the outer shell temperature.

[0017] The advantages of the utility model are as follows:

[0018] 1. The SMT-weldable elastic thermocouple provided by the utility model can be SMT-welded and installed on the internal circuit board together with other electronic components during the production process of optical modules or active cables, without the need for subsequent manual welding, thereby greatly simplifying the production process, saving production costs and improving production efficiency.

[0019] 2. The SMT-weldable elastic thermocouple provided by the utility model can ensure that the temperature measuring head always reliably contacts the housing to be measured, thanks to the stable elastic force provided by the elastomer, thereby greatly improving the contact reliability and stability between the two, thereby ensuring the temperature measurement accuracy and reducing the temperature measurement error.

[0020] 3. The SMT-weldable elastic thermocouple provided by the utility model has a stable overall structure after installation. Since no glue or tape is used, the short circuit problem of the circuit board caused by the failure and fall-off of the glue or tape can be avoided, thereby improving the safety of the optical module or active cable product using it.

[0021] 4. The SMT-weldable elastic thermocouple provided by the utility model can be compatible with various optical modules or active copper cable products with different internal heights (the height from the circuit board to the housing) because the elastic body has a compression stroke, thereby greatly improving the compatibility and flexibility of its application.

[0022] The objects, advantages and features of the present invention will be illustrated and explained by the following non-limiting description of preferred embodiments, which are given as examples only with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a three-dimensional structural schematic diagram of the utility model;

[0024] Figure 2 yes Figure 1 Schematic diagram of the three-dimensional structure after inversion;

[0025] Figure 3 This is a schematic diagram of the external structure of the optical module used by the elastic thermocouple of the utility model;

[0026] Figure 4 The utility model is Figure 4 Schematic diagram of the installation status of the optical module on the internal circuit board.

[0027] Among them: 1. Temperature measuring head; 2. Elastomer; 3. Thermocouple temperature sensing wire; 4. FPC board; 401. Upper board body; 402. Lower board body; 403. Connecting board body; 5. SMT pad; 6. Upper reinforcement board; 7. Lower reinforcement board; 8. Optical module; 9. Housing; 10. Circuit board. DETAILED DESCRIPTION

[0028] Example: Combination Figure 1 to Figure 4 The specific implementation of the SMT-weldable elastic thermocouple provided by the utility model is described as follows:

[0029] The SMT-weldable elastic thermocouple is composed of a temperature measuring head 1, an elastic body 2, a thermocouple temperature sensing wire 3, an FPC board 4, an SMT pad 5, an upper reinforcement plate 6 and a lower reinforcement plate 6.

[0030] The elastic body 2 described in this embodiment is a rectangular parallelepiped made of rubber material, which can be compressed and deformed, and has a compression stroke. The FPC board 4 is bent into a U shape, and the two end plates are respectively fixed to the upper and lower ends of the elastic body 2. One end of the thermocouple temperature sensing line 3 is connected to the temperature measuring head 1, and the temperature measuring head 1 is fixed on the plate body of the FPC board 4 at the upper end of the elastic body 2, while the other end of the thermocouple temperature sensing line 3 is connected to the SMT pad 5, and the SMT pad 5 is mounted and fixed on the plate body of the FPC board 4 at the lower end of the elastic body 2.

[0031] Specific combination Figure 1 and Figure 2 As shown, the FPC board 4 described in this embodiment is composed of a parallel upper plate body 401, a lower plate body 402, and a connecting plate body 403 integrally connecting the upper plate body 401 and the lower plate body 402. The upper plate body 401 is fixed to the upper end of the elastic body 2, the temperature measuring head 1 is mounted and fixed on the upper part of the upper plate body 401 by SMT, and the lower plate body 402 is fixed to the lower end of the elastic body 2, and the SMT pad 5 is mounted and fixed on the lower part of the lower plate body 402.

[0032] An upper reinforcing plate 6 is bonded and fixed between the upper plate body 401 and the upper end of the elastic body 2, and a lower reinforcing plate 7 is bonded and fixed between the lower plate body 402 and the lower end of the elastic body 2. The upper reinforcing plate 6 and the lower reinforcing plate 7 are both PI plates.

[0033] In this embodiment, the thermocouple temperature sensing wire 3 is a flat wire attached to the connecting plate body 403 .

[0034] Still combined Figure 1 and Figure 2 As shown, in this embodiment, there are two thermocouple temperature sensing wires 3, namely a positive wire and a negative wire, one end of which is connected to the temperature measuring head 1, and the other end of which is connected to the two SMT pads 5 respectively.

[0035] Combination Figure 3 and Figure 4 As shown, when the utility model is actually used, the SMT pad 5 at the lower end of the elastomer 2 is soldered and installed on the temperature sensing chip of the internal circuit board 10 of the optical module 8 by SMT method, and the temperature measuring head 1 at the upper end of the elastomer 2 is in contact with the inner wall of the outer shell 9 of the optical module 8, thereby realizing the measurement and monitoring of the temperature of the outer shell 9.

[0036] This SMT-weldable elastic thermocouple can be SMT-welded and installed on the internal circuit board 10 together with other electronic components during the production process of the optical module 8 or active cable, without the need for subsequent manual welding, thereby greatly simplifying the production process, saving production costs and improving production efficiency.

[0037] In addition, thanks to the stable elastic force provided by the elastic body 2, the utility model can ensure that the temperature measuring head 1 always reliably contacts the housing 9 to be measured, thereby greatly improving the contact reliability and stability between the two, thereby ensuring the temperature measurement accuracy and reducing the temperature measurement error.

[0038] In addition, the overall structure of the utility model after installation is stable. Since no glue or tape is used, the short circuit problem of the circuit board 10 caused by the failure of the glue or tape to fall off can be avoided, thereby improving the safety of the optical module 8 or active cable product using it.

[0039] And because the elastomer 2 has a compression stroke, it can be compatible with various optical modules 8 or active copper cable products with different internal heights (the height from the circuit board 10 to the housing 9), greatly improving the compatibility and flexibility of its application.

[0040] Of course, the above are only specific application examples of the utility model, and do not constitute any limitation on the protection scope of the utility model. In addition to the above embodiments, the utility model can also have other implementation methods. Any technical solution formed by equivalent replacement or equivalent transformation falls within the scope of protection required by the utility model.

Claims

1. An SMT-weldable elastic thermocouple, comprising a thermocouple temperature sensing wire (3) and a temperature measuring head (1) arranged at one end of the thermocouple temperature sensing wire (3), characterized in that The invention also comprises a compressible elastic body (2) and an FPC board (4) bent into a U shape, wherein the two end plates of the FPC board (4) are respectively fitted and fixed to the upper and lower ends of the elastic body (2), the temperature measuring head (1) at one end of the thermocouple temperature sensing wire (3) is fixed to the plate body of the FPC board (4) at the upper end of the elastic body (2), and the other end of the thermocouple temperature sensing wire (3) is connected to the SMT pad (5), and the SMT pad (5) is mounted and fixed to the plate body of the FPC board (4) at the lower end of the elastic body (2).

2. The SMT-weldable elastic thermocouple according to claim 1, characterized in that The FPC board (4) comprises an upper plate body (401) and a lower plate body (402) which are parallel to each other, and a connecting plate body (403) which integrally connects the upper plate body (401) and the lower plate body (402), wherein the upper plate body (401) is fixed to the upper end of the elastic body (2), the temperature measuring head (1) is mounted and fixed to the upper part of the upper plate body (401) by means of SMT, and the lower plate body (402) is fixed to the lower end of the elastic body (2), and the SMT pad (5) is mounted and fixed to the lower part of the lower plate body (402).

3. The SMT-weldable elastic thermocouple according to claim 2, characterized in that An upper reinforcing plate (6) is bonded and fixed between the upper plate body (401) and the upper end of the elastic body (2), while a lower reinforcing plate (7) is bonded and fixed between the lower plate body (402) and the lower end of the elastic body (2).

4. The SMT-weldable elastic thermocouple according to claim 2, characterized in that The thermocouple temperature sensing wire (3) is a flat wire attached to the connecting plate body (403).

5. The SMT-weldable elastic thermocouple according to claim 3, characterized in that The upper reinforcing plate (6) is a PI plate or a FR4 plate, and the lower reinforcing plate (7) is also a PI plate or a FR4 plate.

6. An SMT-weldable elastic thermocouple according to claim 1 or 4, characterized in that The thermocouple temperature sensing wires (3) are two in number, namely a positive wire and a negative wire, one end of each of which is connected to the temperature measuring head (1), and the other ends of each of which are respectively connected to the two SMT pads (5).

7. The SMT-weldable elastic thermocouple according to claim 1, characterized in that The elastic body (2) is made of rubber, silicone or PU.

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