Sealing structure of oxygen sensor

Abstract

The utility model discloses a sealing structure of an oxygen sensor, which relates to the technical field of oxygen sensors and comprises a shield. A chip is arranged on the inner side of the protective cover, a sealing pressed powder cake is arranged on the outer side of the chip, and an open hole convenient for the chip to stretch out is formed in one end of the protective cover. A small porcelain piece is arranged at one end, close to the shield opening, of the sealing pressed powder, and a large porcelain piece is arranged on the other side of the sealing pressed powder; the chip is arranged in a long sheet shape, and the end, away from the opening of the protective cover, of the chip is not attached to the protective cover. According to the utility model, the shield can play a role in protection, and the chip on the inner side can conveniently penetrate through the small porcelain piece and the large porcelain piece, so that the chip is conveniently fixed, and the sealing effect is ensured by matching with the sealing pressed powder.

Description

Technical Field

[0001] The utility model specifically relates to the technical field of oxygen sensors, and particularly to a sealing structure of an oxygen sensor. Background Technique

[0002] The sealing performance of the exhaust side (shield end) of the oxygen sensor body is an important indicator for detecting the quality of the oxygen sensor. The sealing performance of the oxygen sensor can be controlled by adjusting the size of the powder cake; therefore, improving the sealing performance of the oxygen sensor is the goal of our continuous improvement.

[0003] Chinese Utility Model Publication No. CN206945603U discloses a concentration difference type oxygen sensor, in particular to a sealing structure of a concentration difference type oxygen sensor. The sealing structure of the concentration difference type oxygen sensor includes a base, a sleeve, a wiring base, a shield and a sensing element. A first ceramic part and a second ceramic part are arranged between the outer circumferential wall of the sensing element and the inner wall of the base. A sealing powder cake is clamped between the opposite end faces of the first ceramic part and the second ceramic part. The sealing powder cake is sleeved on the sensing element, and the outer circumferential surface is in interference fit with the inner wall of the base. A plurality of exhaust gas through holes for passing automobile exhaust gas are arranged on the shield, and a plurality of air through holes for passing air are arranged on the sleeve;

[0004] For the above-mentioned concentration difference type oxygen sensor, by designing the inner cavity of the base into a three-stage stepped hole and installing the sealing powder cake in the smaller middle section hole, the cross-sectional area of the sealing powder cake is reduced, and the sealing performance of the oxygen sensor can be controlled by adjusting the size of the powder cake, thus the sealing performance is reduced; for this reason, we provide a sealing structure of an oxygen sensor. Under the condition of keeping the outer shape of the oxygen sensor body unchanged, the required powder cake is changed from large to small, and the size of the inner cavity of the base needs to be reduced to match the change of the powder cake. In addition, in order to avoid chip breakage caused by excessive pressing, the large ceramic part is changed to a stepped shape, and the final length of the large ceramic part is adjusted as appropriate according to the outer shape length of the oxygen sensor. Content of the Utility Model

[0005] The purpose of the utility model is to provide a sealing structure of an oxygen sensor to solve the problems put forward in the background technique.

[0006] To achieve the above purpose, the utility model provides the following technical solutions:

[0007] A sealing structure of an oxygen sensor includes a shield; a chip is arranged inside the shield, a sealing powder cake is arranged outside the chip, and an opening for the chip to extend out is arranged at one end of the shield; a small ceramic part is arranged at one end of the sealing powder cake close to the opening of the shield, and a large ceramic part is arranged on the other side; the chip is arranged in a long strip shape, and the chip does not fit with the shield and has a certain distance.

[0008] As a further technical solution of the present utility model, the inner wall of the shield fits the hexagonal base and is connected together by riveting, which plays a final supporting and protecting role for the inner chip.

[0009] As a further technical solution of the present utility model, a large porcelain part and a small porcelain part are arranged inside the hexagonal base, and a cavity filled with sealing powder cake is provided between the large porcelain part and the small porcelain part. Through holes for chip insertion are provided on the large porcelain part, the small porcelain part and the sealing powder cake, and the large porcelain part, the small porcelain part and the sealing powder cake play a preliminary fixing and supporting role for the chip.

[0010] As a further technical solution of the present utility model, one end of the chip extending out of the shield is not flush with the shield.

[0011] As a further technical solution of the present utility model, a plurality of circular holes are provided at one end of the shield away from the large porcelain part, and the plurality of circular holes are arranged in a circular array along the central axis of the shield for discharging internal waste gas or condensed water.

[0012] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0013] In the present utility model, the shield can play a protective role, and the inner chip is convenient to pass through the large porcelain part and the small porcelain part, so as to facilitate the fixing of the chip. Together with the sealing powder cake, the sealing effect is ensured; in the present utility model, with the cooperation of the shield, the sealing powder cake is filled between the large porcelain parts and the small porcelain parts on both sides, which can increase the sealing effect between the large porcelain parts, the small porcelain parts and the shield; in the present utility model, the chip is flush with one end of the large porcelain part, which is convenient for plugging with the wire harness terminal to connect the chip. Description of the Drawings

[0014] Figure 1 is a three-dimensional structural schematic diagram of the present utility model.

[0015] Figure 2 is in the present utility model Figure 1 schematic diagram of another perspective.

[0016] Figure 3 is in the present utility model Figure 1 right view.

[0017] Figure 4 is in the present utility model Figure 3 cross-sectional view taken along line A-A.

[0018] In the figure: 1-chip, 2-shield, 3-small porcelain part, 4-sealing powder cake, 5-large porcelain part, 6-hexagonal base. Detailed Embodiment

[0019] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0020] Please refer to Figures 1-4 , in the embodiment of the present invention, a sealing structure of an oxygen sensor includes a shield 2; a chip 1 is arranged inside the shield 2, a sealing powder cake 4 is arranged outside the chip 1, and an opening for the chip 1 to extend out is arranged at one end of the shield 2; a small porcelain part 3 is arranged at one end of the sealing powder cake 4 close to the opening of the shield 2, and a large porcelain part 5 is arranged on the other side; the chip 1 is arranged in a long strip shape, and the chip 1 does not fit with the shield 2 and has a certain distance.

[0021] By adopting the above technical solution, the shield 2 can play a protective role, and the inner chip 1 is convenient to pass through the large porcelain part 5 and the small porcelain part 3, so as to facilitate the fixation of the chip, and then cooperate with the sealing powder cake 4 to ensure the sealing effect.

[0022] In this embodiment, a hexagonal base 6 is attached to the inner wall of the shield 2 and connected together by riveting, which plays a final supporting and protecting role for the inner chip 1.

[0023] Furthermore, a large porcelain part 5 and a small porcelain part 3 are arranged inside the hexagonal base 6, and a cavity filled with the sealing powder cake 4 is between the large porcelain part 5 and the small porcelain part 3. Through holes for the chip 1 to be inserted are arranged on the large porcelain part 5, the small porcelain part 3 and the sealing powder cake 4, and the large porcelain part 5, the small porcelain part 3 and the sealing powder cake 4 play a preliminary fixing and supporting role for the chip 1.

[0024] By adopting the above technical solution, with the cooperation of the shield 2, the sealing powder cake 4 is filled between the large porcelain parts 5 and the small porcelain parts 3 on both sides. The filling height of the sealing powder cake 4 is 6.5 mm, which can increase the sealing effect between the large porcelain parts 5 and the small porcelain parts 3 and the shield 2.

[0025] In this embodiment, one end of the chip 1 extending out of the shield 2 is not flush with the shield 2.

[0026] Furthermore, a plurality of circular holes are arranged at one end of the shield 2 far from the large porcelain part 5, and the plurality of center holes are arranged in a circular array along the central axis of the shield 2 for releasing internal waste gas or condensed water.

[0027] By adopting the above technical solution, one end of the chip 1 is flush with the large porcelain part 5, which is convenient for plugging with the wire harness terminal to connect the chip 1.

[0028] By adopting the above technical solution, in order to avoid infinite pressing of the large porcelain part 5, the large porcelain part 5 is provided with a step and can be directly clamped on the hexagonal base 6.

[0029] The working principle of the present utility model is as follows: during use, the protective cover 2 can play a protective role, and the inner chip 1 is convenient to pass through the large porcelain part 5 and the small porcelain part 3, thus facilitating the fixation of the chip. Then, in cooperation with the sealing powder cake 4, the sealing effect is ensured; with the cooperation of the protective cover 2, the sealing powder cake 4 is filled between the large porcelain part 5 and the small porcelain part 3 on both sides, which can enhance the sealing effect between the large porcelain part 5 and the small porcelain part 3 and the protective cover 2; the chip 1 is flush with one end of the large porcelain part 5, which is convenient for plugging with the wire harness terminal to connect the chip 1; in order to avoid infinite pressing of the large porcelain part 5, the large porcelain part 5 is provided with a step and can be directly clamped on the hexagonal base 6.

[0030] For those skilled in the art, it is obvious that the present utility model is not limited to the details of the above exemplary embodiments, and without departing from the spirit or basic characteristics of the present utility model, the present utility model can be implemented in other specific forms. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present utility model is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present utility model. Any reference signs in the claims should not be regarded as limiting the claims involved.

[0031] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A sealing structure of an oxygen sensor, characterized in that: The invention comprises a protective cover (2); a chip (1) is arranged on the inner side of the protective cover (2); a sealing powder cake (4) is arranged on the outer side of the chip (1); and an opening is arranged at one end of the protective cover (2) for facilitating the extension of the chip (1); a small ceramic piece (3) is arranged at one end of the sealing powder cake (4) close to the opening of the protective cover (2), and a large ceramic piece (5) is arranged at the other end; the chip (1) is arranged in the shape of a long piece, and the chip (1) and the protective cover (2) are not in contact with each other but are at a certain distance from each other.

2. The sealing structure of an oxygen sensor according to claim 1, characterized in that: The inner wall of the shield (2) is fitted with a hexagonal base (6) and connected together by riveting, thereby providing ultimate support and protection for the chip (1) inside.

3. The sealing structure of an oxygen sensor according to claim 2, characterized in that: A large ceramic piece (5) and a small ceramic piece (3) are arranged on the inner side of the hexagonal base (6), and a cavity filled with a sealing powder cake (4) is provided between the large ceramic piece (5) and the small ceramic piece (3). Through holes are provided on the large ceramic piece (5), the small ceramic piece (3) and the sealing powder cake (4) to facilitate the insertion of the chip (1), and the large ceramic piece (5), the small ceramic piece (3) and the sealing powder cake (4) play a preliminary fixing and supporting role for the chip (1).

4. The sealing structure of an oxygen sensor according to claim 3, characterized in that: One end of the chip (1) extending out of the protective cover (2) is not flush with the protective cover (2).

5. The sealing structure of an oxygen sensor according to claim 1, characterized in that: The end of the shield (2) away from the large ceramic piece (5) is provided with a plurality of circular holes, and the plurality of circular center holes are arranged in a circular array along the central axis of the shield (2) for releasing the exhaust gas or condensed water inside.

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