High-performance waterproof nitrogen-oxygen sensor

Abstract

The utility model discloses a high-performance waterproof nitrogen oxygen sensor, which comprises a circuit board, holes are respectively arranged on two sides of the circuit board, and a first connector and a second connector are respectively arranged on two sides of the circuit board. The first connector and the second connector are respectively provided with a connector rib, each connector rib is provided with a plurality of PINs, and the PINs are connected with corresponding holes in the two sides of the circuit board by adopting a PRESSSFIT crimping process; a shell is formed on the outer sides of the circuit board, the first connector and the second connector in a compression molding mode. The shell is formed through compression molding and wraps the connector and the circuit board, no cavity exists in the shell, sealant does not need to be used, a high-temperature baking and curing process is not needed, the connector cancels an exhaust hole, external water vapor cannot enter the shell, and the waterproof performance is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to nitrogen oxygen sensor technical field, concretely is a kind of high-performance waterproof nitrogen oxygen sensor. BACKGROUND

[0002] In the nitrogen oxygen sensor assembly process, when the rear cover is assembled with the shell, sealant is used to ensure sealing and waterproofing. To improve production efficiency, the sealant needs to be cured by high-temperature baking for a certain period of time. High-temperature baking is generally above 100℃ / 1h. During the baking process, if there is no exhaust hole, the air in the shell and the rear cover will expand due to heat, which may cause the plastic rear cover to bulge. In severe cases, it may cause the sealant between the shell and the rear cover to separate, resulting in poor sealing, loss of waterproof performance of the product, and failure of the entire nitrogen oxygen sensor.

[0003] The current mainstream solution on the market is to provide a vent hole on the product connector that communicates with the shell to allow heated air to escape during baking. However, if the client has poor sealing performance on the connector of the plug-in, it may cause water vapor to enter the nitrogen oxygen sensor controller from the connector, resulting in failure of the nitrogen oxygen sensor.

[0004] Another solution is to add a waterproof air-permeable film to the rear cover to ensure the balance of air pressure inside and outside the shell. However, this solution has high costs and complex structure of the rear cover, and cannot isolate water vapor under high pressure. There are basically no mass-produced products using this solution on the market.

[0005] In addition, the nitrogen oxygen sensor connector is used to connect the client's wiring harness and the SCU controller itself. Most connectors on the market use tin soldering to connect with the circuit board in the SCU controller. After soldering, there may be residual flux residue, tin beads, tin wires, and other soldering problems such as virtual welding, short circuit, tin whiskers, cracking, and incomplete immersion. The soldering hole of the circuit board may also be subjected to thermal stress due to soldering.

[0006] Therefore, a high-performance waterproof nitrogen oxygen sensor is proposed. SUMMARY

[0007] The utility model aims at providing a kind of high-performance waterproof nitrogen oxygen sensor, to solve the problems raised in the above background.

[0008] To achieve the above-mentioned purpose, the utility model provides the following technical scheme: a kind of high-performance waterproof nitrogen oxygen sensor, including circuit board, the two sides of the circuit board are respectively provided with hole, the two sides of the circuit board are respectively provided with first connector and second connector;

[0009] Connector ribs are installed on the first connector and the second connector, and a plurality of PIN pins are installed on the connector ribs. The PIN pins are connected to the corresponding holes on the two sides of the circuit board using the PRESSFIT crimping process.

[0010] The outer side of the circuit board, the first connector and the second connector is overmolded with a shell;

[0011] A probe terminal is mounted on the second connector.

[0012] Preferably, positioning columns for pre-positioning are mounted on both sides of the connector rib.

[0013] Preferably, notches for facilitating welding and fixing of the probe terminal are formed on the second connector.

[0014] Preferably, a protective cover is welded on the notches.

[0015] Preferably, a base is arranged at the bottom of the shell, and a clamping plate for fixing the shell is arranged on the base.

[0016] Preferably, a groove is arranged on the outer side of the shell, and a foolproof column matching the groove is arranged on the base.

[0017] Preferably, the connector rib is in the shape of U, M or cross.

[0018] Compared with the prior art, the utility model has the advantages that:

[0019] 1. The shell is overmolded, covering the connector and the circuit board, and no cavity exists in the shell, so that no sealing glue is needed, no high-temperature baking curing process is required, the connector cancels the exhaust hole, the external water vapor cannot enter the shell, and the waterproof performance is improved.

[0020] 2. The PIN pin of the connector is connected to the circuit board by using the PRESSFIT pressure bonding process, so that no welding is needed, no solder residue and tin beads are generated, and common problems such as virtual welding, short circuit, tin whisker, cracking and non-infiltration in the welding process are avoided, the PRESSFIT pressure bonding process can avoid thermal stress of the circuit board, meanwhile, the welding material is saved, the production and equipment costs are reduced, and the product production efficiency is improved. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is a structural schematic view of the utility model;

[0022] Figure 2 It is a structural schematic view of shell transparency of the utility model;

[0023] Figure 3 It is a structural schematic view of matching of the shell and the base of the utility model;

[0024] Figure 4 It is a structural schematic view of connection of the second connector and the probe terminal of the utility model;

[0025] Figure 5It is a structure schematic view of the first connector of the utility model.

[0026] Figure 6 It is a structure schematic view of the second connector of the utility model.

[0027] In the drawing: 1, first connector; 2, circuit board; 21, hole; 3, shell; 31, recess; 4, second connector; 41, notch; 5, protective cover; 6, probe terminal; 7, base; 71, foolproof column; 72, clamping plate; 8, PIN; 9, connector rib; 10, positioning column. DETAILED DESCRIPTION

[0028] The technical scheme in the embodiments of the utility model will be described clearly and completely in connection with the drawings in the embodiments of the utility model.

[0029] EMBODIMENT

[0030] Please refer to Figures 1-6 The utility model provides a kind of technical scheme: a high-performance waterproof nitrogen oxygen sensor, including circuit board 2, the hole 21 is set on the two sides of circuit board 2 respectively, the two sides of circuit board 2 are equipped with first connector 1 and second connector 4 respectively;

[0031] First connector 1 and second connector 4 are all installed connector rib 9 on, and multiple PIN 8 are installed on connector rib 9, PIN 8 is connected using PRESSFIT pressure bonding process with the hole 21 corresponding on the two sides of circuit board 2, and the positioning column 10 for pre-positioning is installed on the two sides of connector rib 9, as shown in Figure 5 And Figure 6 As shown.

[0032] PIN 8 of first connector 1 and second connector 4 is connected with circuit board 2 by PRESSFIT pressure bonding process.This kind of process does not need to weld, will not produce solder residue, tin bead, the common virtual welding, short circuit in soldering process, avoids soldering problems such as tin whisker, cracking, not to soak in.Meanwhile, since high-temperature melting solder is not needed, circuit board 2 can also avoid producing thermal stress after welding, save solder, effectively reduce production and equipment cost.Press bonding, positioning column 10 and the hole position corresponding circuit board 2 realize pre-positioning, avoid PIN 8 press bonding when deviation.

[0033] The outside of circuit board 2, first connector 1 and second connector 4 is molded with shell 3;

[0034] After the crimping is completed, the first connector 1 and the second connector 4 and the circuit board 2 are placed into a mold, the shell 3 is formed by a mold pressing process, and after the shell 3 is formed, the first connector 1, the circuit board 2 and the second connector 4 can be partially covered. This forming method is short in time, can ensure that there is no cavity in the shell 3, does not need to use sealing glue, that is, does not need a high-temperature baking curing process. The first connector 1 can cancel the exhaust hole, external moisture cannot enter the shell 3 through the first connector 1, the waterproof performance is greatly improved, the material, production and equipment costs are reduced, and the product production efficiency is improved. Meanwhile, the shell and the rear cover of the existing product on the market are integrated, the use of the rear cover is cancelled, the number of parts is reduced, and the material cost is reduced; the overall structure is compact and small, and is lightweight.

[0035] As shown in Figure 1 , Figure 3 and Figure 4 : the second connector 4 is provided with a probe terminal 6, a notch 41 is formed in the second connector 4 for facilitating welding and fixing of the probe terminal 6, and a protective cover 5 is welded on the notch 41; through the above arrangement, after the shell 3, the first connector 1, the second connector 4 and the circuit board 2 are assembled, the probe terminal 6 is assembled with the second connector 4, the second connector 4 is provided with a rectangular notch 41, and after the installation of the probe terminal 6 is completed, laser welding is performed to ensure that the PIN pin 8 on the second connector 4 is reliably connected with the probe terminal 6. Then, the protective cover 5 is assembled and connected with the second connector 4 by laser welding, effectively preventing external foreign matters from entering the interior of the second connector 4.

[0036] As shown in Figure 3 : the bottom of the shell 3 is provided with a base 7, the base 7 is provided with a clamping plate 72 for fixing the shell 3, the outer side of the shell 3 is provided with a groove 31, and the base 7 is provided with a foolproof column 71 matched with the groove 31; through the above arrangement, the shell 3 is provided with asymmetric grooves 31 on both sides, which can match the foolproof column 71 on the base 7.

[0037] As shown in Figure 5 and Figure 6 : the connector rib 9 is in the shape of U, M or cross; through the above arrangement, when the connector is crimped with the circuit board 2, the rib top plane effectively supports the circuit board 2. When the shell 3 is encapsulated and formed, the connector rib 9 can ensure that the shell 3 and the connector are prevented from being separated and rotated during subsequent use of the product.

[0038] Although the embodiments of the utility model have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and spirits of the utility model, and the scope of the utility model is defined by the appended claims and their equivalents.

Claims

1. A high performance waterproof nitrogen oxygen sensor comprising a circuit board (2), characterized in that: The circuit board (2) is provided with holes (21) on both sides, and the first connector (1) and the second connector (4) are arranged on both sides of the circuit board (2) respectively; The connector rib (9) is arranged on the first connector (1) and the second connector (4), and a plurality of PIN pins (8) are arranged on the connector rib (9), wherein the PIN pins (8) are connected with the corresponding holes (21) on both sides of the circuit board (2) by using a PRESSFIT pressure connection process; The circuit board (2), the first connector (1) and the second connector (4) are molded with the shell (3) on the outer side. The second connector (4) is provided with a probe terminal (6).

2. The high performance waterproof nitrogen-oxygen sensor according to claim 1, wherein: The connector rib (9) is provided with positioning columns (10) for pre-positioning on both sides.

3. The high performance waterproof nitrogen-oxygen sensor according to claim 1, wherein: The second connector (4) is provided with a notch (41) for facilitating welding and fixing of the probe terminal (6).

4. The high performance waterproof nitrogen-oxygen sensor according to claim 3, wherein: The notch (41) is welded with a protective cover (5).

5. The high performance waterproof nitrogen-oxygen sensor according to claim 1, wherein: The bottom of the shell (3) is provided with a base (7), and the base (7) is provided with a clamping plate (72) for fixing the shell (3).

6. The high performance waterproof nitrogen-oxygen sensor according to claim 5, wherein: The outer side of the shell (3) is provided with a groove (31), and the base (7) is provided with a foolproof column (71) matched with the groove (31).

7. The high performance waterproof nitrogen-oxygen sensor according to claim 1, wherein: The shape of the connector rib (9) is U-shaped, M-shaped or cross-shaped.

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