Short circuit prevention welding encapsulation structure of sensor

Abstract

The utility model discloses an anti-short-circuit welding encapsulation structure of a sensor, which relates to the technical field of electronic device encapsulation and comprises a rubber seat main body, an NTC (Negative Temperature Coefficient) chip, a plurality of PINs (Pin Needles), UV (Ultraviolet) glue and a temperature measurement protective shell, the PINs are embedded in the rubber base main body; a pin of the NTC chip is welded with the PIN needle; the welding positions of the pins of the NTC chip and the PINs are wrapped in the UV glue; a single pin and a single PIN of the NTC chip are connected into a group, and UV glue is arranged between every two groups at intervals; the NTC chip is sleeved with the temperature measurement protection shell, and the temperature measurement protection shell is sleeved with one end of the rubber base body. According to the utility model, after the pins of the NTC chip and the PINs are soldered, the welding parts are encapsulated through the UV glue, so that the two pins and the two PINs are separated while the welding parts are fixed; the problem of short circuit or poor insulation and voltage resistance of a sensor product caused by residual welding slag at a welding part is avoided; and the curing speed of the UV glue is high, so that the efficiency of the sensor product production process is also improved.

Description

Technical Field

[0001] The utility model relates to the technical field of electronic device packaging, in particular to an anti-short-circuit welding packaging structure of a sensor. Background Art

[0002] A temperature sensor is a sensor that can sense temperature and convert it into a usable output signal. It can be divided into two categories: contact and non-contact according to the measurement method, and can be divided into thermal resistors and thermocouples according to the characteristics of sensor materials and electronic components.

[0003] The temperature sensor using NTC chip is a thermal resistor type temperature sensor. In industry applications, temperature sensors are mainly used in home appliances, automobiles, energy storage, etc. for temperature detection.

[0004] In production, the connection between the PIN needle and the NTC chip needs to be soldered by tin. It is found that due to the welding slag, when the NTC chip pin and the PIN needle are soldered, it is easy to cause a short circuit or poor insulation withstand voltage at the welding position of the NTC chip pin and the PIN needle, affecting the insulation withstand voltage performance of the NTC chip and the PIN needle, and easily affecting the performance of the temperature sensor; thereby having a great impact on the production yield rate of the temperature sensor product, increasing the workload of quality inspection, increasing the product scrap rate, greatly increasing the production cost, and affecting the normal production of the product.

[0005] In the prior art, the industry usually uses the following methods to solve the problem of connecting the NTC chip pins and PIN pins:

[0006] 1. Put a sleeve on the PIN pin, and make the sleeve cover the NTC chip pin and the PIN pin after welding;

[0007] 2. Clean the PIN connection part;

[0008] 3. Encapsulate the PIN connection parts with epoxy resin.

[0009] However, the above three improvement methods all require additional process steps in production, which undoubtedly adds huge costs to production agents, especially in the electronics industry, where labor costs account for a large part. Moreover, due to the difference in expansion coefficients between the packaging material encapsulated by epoxy resin and the NTC chip, epoxy resin generally has the characteristics of high strength after curing. When the product is in harsh high and low temperature environments, the temperature sensor NTC thermistor chip is easily damaged by the stress of the packaging material, causing sensor failure. Therefore, a new solution is urgently needed to solve the problem of short circuits between the NTC chip pins and the PIN pins.

[0010] In summary, the applicant has found that the prior art has at least the following technical problems:

[0011] In the existing temperature sensor structure, there is a problem that the connection between the NTC chip pin and the PIN pin is prone to short circuit or poor insulation withstand voltage. Utility Model Content

[0012] The utility model aims to provide a sensor short-circuit proof welding encapsulation structure to solve the problem of short circuit or poor insulation withstand voltage in the connection between the NTC chip pin and the PIN needle in the existing temperature sensor structure.

[0013] The various technical effects that can be produced by the preferred technical solution among the various technical solutions provided by the utility model are described in detail below.

[0014] In order to solve the above technical problems, the utility model provides the following technical solutions:

[0015] The utility model provides an anti-short circuit welding encapsulation structure of a sensor, comprising a glue seat body, an NTC chip, a plurality of PIN needles, UV glue and a temperature measuring protective shell; the PIN needle is embedded in the glue seat body; the pin of the NTC chip is welded to the PIN needle; the welding part between the pin of the NTC chip and the PIN needle is wrapped in the UV glue; a single pin of the NTC chip is connected to a single PIN needle as a group, and the UV glue is spaced between each group; the temperature measuring protective shell is sleeved outside the NTC chip, and the temperature measuring protective shell is sleeved with one end of the glue seat body.

[0016] In one embodiment, the adhesive seat body and the plurality of PIN needles are integrally formed.

[0017] In one of the embodiments, a recessed seat and a convex half-seat are respectively provided at opposite ends of the rubber seat body; one end of the two PIN needles extends into the cavity of the recessed seat; a connecting groove is provided on the end surface in the length direction of the convex half-seat, and the other ends of the two PIN needles extend into the connecting groove; an insulating rib is provided in the middle of the connecting groove, and the insulating rib is arranged between the two PIN needles.

[0018] In one of the embodiments, the pins of the NTC chip extend into the connecting grooves and are welded to the PIN pins; the UV glue is filled in the connecting grooves and the insulating ribs to form raised glue blocks, and wrap the pins of the NTC chip and the PIN pins.

[0019] In one of the embodiments, the temperature measuring protective shell includes a connecting seat and a temperature measuring needle connected in sequence; a accommodating cavity is provided in the connecting seat, and both ends of the connecting seat are connected to the accommodating cavity; one end of the connecting seat is sleeved on the outside of the convex half seat, and the convex half seat extends into the accommodating cavity; the temperature measuring needle is hollow inside and open at one end; the open end of the temperature measuring needle is sleeved on the other end of the connecting seat; the NTC chip is placed in the closed end of the temperature measuring needle; the closed end of the temperature measuring needle is filled with thermal conductive glue, and the thermal conductive glue wraps the NTC chip.

[0020] In one of the embodiments, heat-insulating glue is provided at the port where the temperature measuring needle is connected to the connecting seat.

[0021] In one of the embodiments, the thermal insulation glue is thermal insulation silica gel; the thermal insulation glue is cylindrical in shape and is provided with two through holes in the length direction of the thermal insulation glue; the two pins of the NTC chip pass through the two through holes of the thermal insulation glue.

[0022] The beneficial effects of the utility model are as follows:

[0023] The anti-short circuit welding encapsulation structure includes a glue seat body, an NTC chip, multiple PIN needles, UV glue and a temperature measuring protective shell; the PIN needle is embedded in the glue seat body, the pin of the NTC chip is welded to the PIN needle, and the welding point between the pin of the NTC chip and the PIN needle is wrapped in the UV glue; the temperature measuring protective shell is sleeved on the outside of the NTC chip, and the temperature measuring protective shell is sleeved on one end of the glue seat body.

[0024] Among them, a single pin of the NTC chip is connected to a single PIN needle as a group, and the UV glue is arranged between each group; by arranging the UV glue at the welding position of the pin of the NTC chip and the PIN needle, it is beneficial to fix the welding position, and at the same time, the two pins and the two PIN needles are separated, thereby avoiding the problem of residual welding slag at the welding position after the PIN needle and the pin of the NTC chip are soldered, causing short circuit or poor insulation withstand voltage to the sensor product.

[0025] The UV glue curing method used has the advantages of high curing efficiency and convenient curing method compared with the traditional epoxy resin encapsulation method. Compared with epoxy resin, UV glue has better mechanical properties and is easier to adapt to the extreme temperature difference environment where the sensor is located. It is less likely to crack in an extreme temperature difference environment and can better protect the welding parts.

[0026] The anti-short-circuit welding encapsulation structure of the UV glue is arranged at the welding position of the pin of the NTC chip and the PIN needle, which has a simple structure and a few and simple production process steps, so that the use of this anti-short-circuit structure can improve production efficiency and thus save production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solution of the present invention, the drawings required for use in the implementation mode will be briefly introduced below. Obviously, the drawings described below are only some implementation modes of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0028] Figure 1 It is a front view of the first embodiment of the utility model as a whole;

[0029] Figure 2 It is a sectional view of the first embodiment of the utility model as a whole from the rear;

[0030] Figure 3 It is a sectional view of the first embodiment of the utility model as a whole from the side;

[0031] Figure 4 This is a partial structural diagram of the main body of the rubber seat of the first embodiment of the utility model;

[0032] Figure 5 It is a structural schematic diagram of a temperature measuring needle and a heat-insulating adhesive according to a second embodiment of the utility model.

[0033] The reference numerals are as follows:

[0034] 1. Rubber seat body; 11. Concave seat; 12. Convex half seat; 121. Connecting groove; 122. Insulating ribs;

[0035] 2.NTC chip; 21.Pin;

[0036] 3. PIN needle;

[0037] 4. UV glue;

[0038] 5. Temperature measuring protective shell; 51. Connecting seat; 511. Accommodating cavity; 52. Temperature measuring needle; 521. Open end; 522. Closed end; 523. Thermal conductive glue; 53. Thermal insulating glue; 531. Perforation;

[0039] 6. Washer;

[0040] 7. Sealing ring. DETAILED DESCRIPTION

[0041] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0042] Obviously, the described embodiments are only some embodiments of the utility model, not all embodiments. Based on the embodiments of the utility model, all other implementation methods obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0043] A sensor short-circuit proof welding packaging structure is provided in a specific embodiment, which realizes that after the pins and PIN needles of the NTC chip are soldered, the welding parts are sealed by UV glue, which fixes the welding parts and separates the two pins and the two PIN needles; the problem of short circuit or poor insulation withstand voltage in the connection between the pins and PIN needles of the NTC chip in the existing temperature sensor structure is effectively solved.

[0044] Hereinafter, embodiments will be described with reference to the drawings. In addition, all contents of the configurations shown in the following embodiments are not necessarily limited to the solutions of the utility model described in the claims.

[0045] The first embodiment of the sensor's short-circuit proof welding encapsulation structure is as follows: Figures 1 to 3 As shown, it includes a rubber seat body 1, an NTC chip 2, multiple PIN needles 3, UV glue 4 and a temperature measuring protective shell 5; the PIN needle 3 is embedded in the rubber seat body 1; the pin 21 of the NTC chip 2 is welded to the PIN needle 3; the welding point between the pin 21 of the NTC chip 2 and the PIN needle 3 is wrapped in UV glue 4; a single pin 21 of the NTC chip 2 is connected to a single PIN needle 3 as a group, and UV glue 4 is spaced between each group; the temperature measuring protective shell 5 is sleeved on the outside of the NTC chip 2, and the temperature measuring protective shell 5 is sleeved on one end of the rubber seat body 1.

[0046] Among them, by arranging UV glue 4 at the welding position of the pin 21 of the NTC chip 2 and the PIN needle 3, it is beneficial to fix the welding position, and at the same time, the two pins 21 and the two PIN needles 3 are separated, so as to avoid the problem of residual welding slag at the welding position after the PIN needle 3 and the pin 21 of the NTC chip 2 are soldered, causing short circuit or poor insulation withstand voltage to the sensor product.

[0047] The UV glue 4 curing method used has the effects of high curing efficiency and convenient curing method compared with the traditional epoxy resin encapsulation method. Compared with epoxy resin, UV glue 4 has better mechanical properties and is easier to adapt to the extreme temperature difference environment where the sensor is located. It is less likely to crack in an extreme temperature difference environment and can better protect the welding parts.

[0048] An anti-short-circuit welding encapsulation structure of UV glue 4 is arranged at the welding position of the pin 21 of the NTC chip 2 and the PIN needle 3. The structure is simple and the production process steps are few and simple, so that the use of this anti-short-circuit structure can improve production efficiency and thus save production costs.

[0049] As one optional implementation method:

[0050] Regarding the structure of the above-mentioned adhesive base body 1 and the PIN needles 3, the adhesive base body 1 and the plurality of PIN needles 3 are an integrally formed structure.

[0051] Regarding the specific structure of the above-mentioned adhesive seat body 1, this embodiment Figures 1 to 3 As shown, a recess 11 and a convex half seat 12 are respectively provided at opposite ends of the rubber seat body 1; one end of the two PIN needles 3 extends into the cavity of the recess 11; a connecting groove 121 is provided on the end surface of the convex half seat 12 in the length direction, and the other ends of the two PIN needles 3 extend into the connecting groove 121; an insulating rib 122 is provided in the middle of the connecting groove 121, and the insulating rib 122 is arranged between the two PIN needles 3.

[0052] Specifically, the convex half seat 12 is a semicircular boss seat extending from one end of the rubber seat body 1.

[0053] During application, by setting the connection groove 121, the two pins 21 of the NTC chip 2 and the connection ends of the two PIN needles 3 can be placed in the connection groove 121 for connection, and then the two groups of the pins 21 and the PIN needles 3 of the NTC chip 2 are separated by the provided insulating ribs 122, so as to prevent the solder slag overflowing during soldering from electrically connecting the pins 21 and the PIN needles 3 of the two groups of the NTC chip 2 to each other, thereby causing a short circuit; thereby, the pins 21 and the PIN needles 3 of the two groups of the NTC chip 2 are electrically isolated by the insulating ribs 122 in the connection groove 121 of the convex half seat 12 during soldering, and then the welding part is encapsulated by the UV glue 4, thereby avoiding the problem of product short circuit or poor insulation withstand voltage due to the solder slag remaining in the welding part.

[0054] Regarding the encapsulation structure of the UV glue 4, this embodiment is as follows Figure 2 and Figure 3 As shown, the pin 21 of the NTC chip 2 extends into the connection groove 121 and is welded to the PIN needle 3; the UV glue 4 is filled in the connection groove 121 and the insulating rib 122 to form a raised glue block, and wraps the pin 21 of the NTC chip 2 and the PIN needle 3.

[0055] During application, the UV glue 4 is filled in the connection groove 121 and the insulating rib 122 to form a raised glue block, which connects the pin 21 of the NTC chip 2, the PIN needle 3, the ground of the connection groove 121 and the insulating rib 122, and can firmly fix the position of the pin 21 and the PIN needle 3 of the NTC chip 2, avoiding desoldering of the welding parts under extreme temperature differences, and avoiding poor conductivity and affecting the temperature measurement performance of the sensor.

[0056] Regarding the specific structure of the temperature measuring protective shell 5 and the NTC chip 2, this embodiment Figure 2 and Figure 4 As shown, the temperature measuring protective shell 5 includes a connecting seat 51 and a temperature measuring needle 52 which are connected in sequence; a receiving cavity 511 is provided in the connecting seat 51, and both ends of the connecting seat 51 are connected to the receiving cavity 511; one end of the connecting seat 51 is sleeved on the outside of the convex half seat 12, and the convex half seat 12 extends into the receiving cavity 511; the temperature measuring needle 52 is hollow inside and open at one end; the open end 521 of the temperature measuring needle 52 is sleeved on the other end of the connecting seat 51; the NTC chip 2 is placed in the closed end 522 of the temperature measuring needle 52; the closed end 522 of the temperature measuring needle 52 is filled with thermal conductive glue 523, and the thermal conductive glue 523 wraps the NTC chip 2.

[0057] During application, the thermal conductive adhesive 523 wrapped around the NTC chip 2 can fill the gap between the NTC chip 2 and the shell of the temperature measuring needle 52. Because the thermal conductive adhesive 523 has a high thermal conductivity, the heat on the shell of the temperature measuring needle 52 can be evenly and timely transferred to the NTC chip 2, thereby improving the temperature measurement sensitivity of the sensor product.

[0058] In addition, a gasket 6 is provided at the connection position between the rubber seat body 1 and the connection seat 51, which can make the connection between the rubber seat body 1 and the connection seat 51 more secure and prevent the connection part from cracking easily in an environment with extreme temperature difference.

[0059] A sealing ring 7 is provided between the outer side of the round shoulder of the connection seat 51 and the thread, so that when the sensor is installed on the device to be used, the threaded hole of the connection can be sealed.

[0060] The second embodiment of the sensor's short-circuit-proof welding package structure is as follows: Figure 5 As shown, the difference between this embodiment and the first embodiment is that a heat insulating glue 53 is provided at the port where the temperature measuring needle 52 is connected to the connecting seat 51.

[0061] Specifically, the thermal insulation glue 53 is thermal insulation silica gel; the shape of the thermal insulation glue 53 is cylindrical, and two through holes 531 are provided in the length direction of the thermal insulation glue 53; the two pins 21 of the NTC chip 2 pass through the two through holes 531 of the thermal insulation glue 53.

[0062] During application, by setting a heat insulating glue 53 at the port where the temperature measuring needle 52 is connected to the connecting seat 51, the heat insulating glue 53 can prevent most of the heat from being transferred to the accommodating cavity 511 of the connecting seat 51, or prevent the heat from being transferred out of the accommodating cavity 511. When the sensor is at an extreme temperature, the temperature change rate in the accommodating cavity 511 can be slowed down, further protecting the tin welding connection parts of the pin 21 of the NTC chip 2 and the PIN pin 3, so that the stability of the sensor is further improved.

[0063] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described.

[0064] The above are preferred embodiments of the present invention. It should be noted that, for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications are also considered to be within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A sensor short-circuit proof welding packaging structure, characterized in that: Including the main body of the glue holder, NTC chip, multiple PIN needles, UV glue and temperature measurement protective shell; The PIN needle is embedded in the main body of the plastic seat; The pin of the NTC chip is welded to the PIN pin; The welding point between the pin of the NTC chip and the PIN needle is wrapped in the UV glue; A single pin of the NTC chip is connected to a single PIN pin as a group, and the UV glue is spaced between each group; The temperature measuring protective shell is sleeved on the outside of the NTC chip, and the temperature measuring protective shell is sleeved on one end of the rubber seat body.

2. The anti-short circuit welding encapsulation structure according to claim 1, characterized in that: The adhesive seat body and the plurality of PIN needles are an integrally formed structure.

3. The short-circuit-proof welding encapsulation structure according to claim 2, characterized in that: The opposite ends of the rubber seat body are respectively provided with a concave seat and a convex half seat; One end of the two PIN needles extends into the cavity of the recess; A connecting groove is provided on the end surface of the convex half seat in the length direction, and the other ends of the two PIN needles extend into the connecting groove; An insulating rib is provided in the middle of the connecting groove, and the insulating rib is arranged between the two PIN needles.

4. The short-circuit-proof welding encapsulation structure according to claim 3, characterized in that: The pin of the NTC chip extends into the connecting groove and is welded to the PIN pin; The UV glue is filled in the connection groove and the insulating rib to form a raised glue block, and wraps the pins of the NTC chip and the PIN needle.

5. The short-circuit-proof welding encapsulation structure according to claim 3, characterized in that: The temperature measuring protective shell comprises a connecting seat and a temperature measuring needle which are connected in sequence; The connection seat is provided with a receiving cavity, and both ends of the connection seat are connected to the receiving cavity through the connection seat; One end of the connecting seat is sleeved on the outside of the convex half seat, and the convex half seat extends into the accommodating cavity; The temperature measuring needle is hollow inside and open at one end; the open end of the temperature measuring needle is sleeved in the other end of the connecting seat; The NTC chip is placed in the closed end of the temperature measuring needle; The closed end of the temperature measuring needle is filled with thermal conductive glue, and the thermal conductive glue wraps the NTC chip.

6. The short-circuit-proof welding encapsulation structure according to claim 5, characterized in that: The port where the temperature measuring needle is connected to the connecting seat is provided with heat insulating glue.

7. The short-circuit-proof welding encapsulation structure according to claim 6, characterized in that: The thermal insulation glue is thermal insulation silica gel; The shape of the thermal insulation glue is cylindrical, and two through holes are provided in the length direction of the thermal insulation glue; The two pins of the NTC chip pass through the two through holes of the thermal insulation glue.

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