CN219084815U - Pre-pressing structure of gas sensor and gas sensor structure - Google Patents

Abstract

The utility model discloses a pre-pressing structure of a gas sensor and a gas sensor structure. The pre-pressing structure comprises: a terminal holder having an accommodation space provided therein for accommodating at least one pair of contact terminals; and the at least one pair of contact terminals are oppositely arranged in the accommodating space, wherein each contact terminal comprises a terminal body and an elastic bending part, the elastic bending part bends towards the center direction of the terminal retainer along the upper end of the terminal body and extends towards the lower side far away from the terminal body, and the bending width of the elastic bending part in the transverse direction in a natural state is larger than half of the transverse distance of the accommodating space. The utility model can always keep the center of the sensing element and the center of the contact terminal to be centered in the dynamic assembly process, and the contact terminal can also provide enough contact force to fix the sensing element.

Description

Pre-pressing structure of gas sensor and gas sensor structure

Technical Field

The utility model relates to the field of sensors, in particular to a pre-pressing structure of a gas sensor and the gas sensor structure.

Background

A gas sensor is a detection technique that takes a certain characteristic of a gas as a test target and converts it into an instrument-readable signal, thereby completing a gas test. Gas sensors have found wide application in many fields, such as oxygen sensors in automotive fields, which are mainly used for detecting the concentration of oxygen in exhaust gas, thereby reducing exhaust pollution.

The gas sensor generally has a plate-type sensor element, the end of which has electrode contacts, which are connected to the sensor element contacts by means of elastic contact terminals and from which signals are derived by means of wire harnesses. Contact terminals are arranged on two sides of the sensing element, and the two sides are contacted with the contact terminals. However, due to the tolerance in terms of manufacturing and assembly, there is a deviation between the position center of the sensor element and the position center of the contact terminal, and if the position of the sensor element is deviated to one terminal, one terminal of the two terminals is pressed more and the other terminal is pressed less, and in a limit case, the one terminal may be separated from contact when the central deviation is large.

The prior art generally addresses the above-described problem of centering the sensor element with the center of the contact terminal in the following manner. For example, the positions of the sensor element and the terminal are designed within a small tolerance range, and raw materials out of the tolerance range are screened out and scrapped through online 100% dimension detection during production. For another example, by floating assembly, the small assembly of the contact terminal and the terminal holder is not completely fixed in position during assembly, and the terminal position can be automatically adjusted according to the position of the sensor element, so that the centering of the sensor element and the center of the terminal is ensured. However, the first way increases the equipment cost and also increases the overall cost due to material scrap. In the second way, the terminal cannot float along with the position of the sensor element under partial conditions, the floating function is limited, and the problem of keeping the center of the sensor element and the center of the contact terminal centered in the dynamic assembly process cannot be completely solved.

In order to solve the above-mentioned problems in the prior art, there is a need in the art for a pre-pressing structure of a gas sensor, which can always keep the center of a sensor element and a contact terminal centered in a dynamic assembly process, and the contact terminal can also provide a sufficient contact force to fix the sensor element.

Disclosure of Invention

The following presents a simplified summary of one or more aspects in order to provide a basic understanding of such aspects. This summary is not an extensive overview of all contemplated aspects, and is intended to neither identify key or critical elements of all aspects nor delineate the scope of any or all aspects. Its sole purpose is to present some concepts of one or more aspects in a simplified form as a prelude to the more detailed description that is presented later.

In order to overcome the defects in the prior art, the utility model provides a pre-pressing structure of a gas sensor and the gas sensor, which can always keep the center of a sensing element and a contact terminal to be centered in the dynamic assembly process, and the contact terminal can also provide enough contact force to fix the sensing element.

Specifically, the pre-pressing structure of the gas sensor provided according to the first aspect of the present utility model includes: a terminal holder having an accommodation space provided therein for accommodating at least one pair of contact terminals; and the at least one pair of contact terminals are oppositely arranged in the accommodating space, wherein each contact terminal comprises a terminal body and an elastic bending part, the elastic bending part bends towards the center direction of the terminal retainer along the upper end of the terminal body and extends towards the lower side far away from the terminal body, and the bending width of the elastic bending part in the transverse direction in a natural state is larger than half of the transverse distance of the accommodating space.

Optionally, in some embodiments, the resilient flexing portions of the at least one pair of contact terminals within the receiving space are in contact with each other in a lateral direction and are each precompressed a portion of the flexing width.

Optionally, in some embodiments, the at least one pair of contact terminals includes a plurality of pairs of contact terminals, wherein the pre-compression contact surfaces of each pair of contact terminals in the plurality of pairs of contact terminals are at the same height.

Optionally, in some embodiments, the pairs of contact terminals are oppositely disposed in the accommodation space with a unique lateral distance, and the bending width of the elastic bending part of each pair of contact terminals in the lateral direction is greater than half of the unique lateral distance in a natural state.

Optionally, in some embodiments, the pairs of contact terminals are oppositely disposed in the accommodating spaces with non-unique lateral distances, and the bending width of the elastic bending parts of each pair of contact terminals in the lateral direction is greater than half of the corresponding lateral distance in a natural state.

Optionally, in some embodiments, the contact surfaces of the at least one pair of contact terminals that are in contact with each other are arc surfaces.

Optionally, in some embodiments, the accommodating space includes at least one pair of terminal fixing channels to be correspondingly introduced into the at least one pair of contact terminals, the at least one pair of terminal fixing channels are disposed opposite to each other, and a distance between opposite faces of the two terminal fixing channels is the lateral distance.

Optionally, in some embodiments, the terminal bodies of the at least one pair of contact terminals are detachably secured in the corresponding at least one pair of terminal-securing passages.

Optionally, in some embodiments, the contact terminal is a metal structure.

Further, the above-described gas sensor structure provided according to the second aspect of the present utility model includes: the pre-pressing structure of the gas sensor; and a sensor element inserted into the contact surfaces of the at least one pair of contact terminals, the sensor element being fixedly engaged with the terminal holder by elastic force of the elastic bending portions of the at least one pair of contact terminals in the center direction.

Drawings

The above features and advantages of the present utility model will be better understood after reading the detailed description of embodiments of the present disclosure in conjunction with the following drawings. In the drawings, the components are not necessarily to scale and components having similar related features or characteristics may have the same or similar reference numerals.

FIG. 1 shows a schematic diagram of a prior art gas sensor structure;

FIG. 2 illustrates a schematic structural view of a pre-compression structure provided in accordance with some embodiments of the present utility model;

fig. 3 illustrates a schematic structural view of a contact terminal in a pre-compression structure provided according to some embodiments of the present utility model;

FIG. 4 illustrates a schematic diagram of a gas sensor structure provided in accordance with some embodiments of the utility model;

FIG. 5 shows a schematic structural view of a gas sensor structure provided in accordance with further embodiments of the present utility model;

FIG. 6 shows a schematic top view of the contact surface of a contact terminal in a prior art gas sensor; and

fig. 7 illustrates a schematic top view of a contact surface of a contact terminal provided in accordance with some embodiments of the present utility model.

Reference numerals:

100. a gas sensor structure;

110. 220 contact terminals;

120. 210, 510 terminal holders;

211. 511 accommodation space;

130. 300 sensor elements;

221. a terminal body;

222. an elastic bending part;

200. 500 prepressing structure;

520. a first pair of contact terminals;

530. a second pair of contact terminals;

h bending width;

d transverse distance.

Detailed Description

Further advantages and effects of the present utility model will become apparent to those skilled in the art from the disclosure of the present specification, by describing the embodiments of the present utility model with specific examples. While the description of the utility model will be presented in connection with a preferred embodiment, it is not intended to limit the inventive features to that embodiment. Rather, the purpose of the utility model described in connection with the embodiments is to cover other alternatives or modifications, which may be extended by the claims based on the utility model. The following description contains many specific details for the purpose of providing a thorough understanding of the present utility model. The utility model may be practiced without these specific details. Furthermore, some specific details are omitted from the description in order to avoid obscuring the utility model.

In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

In addition, the terms "upper", "lower", "left", "right", "top", "bottom", "horizontal", "vertical" as used in the following description should be understood as referring to the orientation depicted in this paragraph and the associated drawings. This relative terminology is for convenience only and is not intended to be limiting of the utility model as it is described in terms of the apparatus being manufactured or operated in a particular orientation.

It will be understood that, although the terms "first," "second," "third," etc. may be used herein to describe various elements, regions, layers and/or sections, these elements, regions, layers and/or sections should not be limited by these terms and these terms are merely used to distinguish between different elements, regions, layers and/or sections. Accordingly, a first component, region, layer, and/or section discussed below could be termed a second component, region, layer, and/or section without departing from some embodiments of the present utility model.

Referring first to fig. 1, fig. 1 shows a schematic structure of a gas sensor in the prior art.

As depicted in fig. 1, gas sensor structure 100 includes contact terminals 110 and terminal holders 120. Because of the tolerance of the gas sensor structure 100 in terms of manufacturing and assembly, there is a deviation between the center of the sensor element 130 and the center of the contact terminal 110, if the sensor element is biased to one side terminal, the one side terminal is pressed more and the other side is pressed less, and in the limit, the one side terminal may be separated from contact when the center deviation is large.

In the prior art, the above-described problem of centering the sensor element 130 with the contact terminal 110 is generally handled in the following manner. For example, the sensor element 130 and the contact terminal 110 are designed to be positioned within a small tolerance range, and raw materials out of the tolerance range are screened out and scrapped by online 100% dimension detection during production. For another example, by floating assembly, the small assembly of the contact terminal 110 and the terminal holder 120 is not completely fixed in position during assembly, and the position of the contact terminal 110 can be automatically adjusted according to the position of the sensor element 130, so as to ensure that the sensor element 130 is centered with the contact terminal 110. However, the first way increases the equipment cost and also increases the overall cost due to material scrap. In the second way, the terminal cannot float along with the position of the sensor element under partial conditions, the floating function is limited, and the problem of keeping the center of the sensor element and the center of the contact terminal centered in the dynamic assembly process cannot be completely solved.

In order to solve the problems in the prior art, the utility model provides a pre-pressing structure of a gas sensor and a gas sensor structure, which can always keep the center of a sensing element and a contact terminal to be centered in the dynamic assembly process, and the contact terminal can also provide enough contact force to fix the sensing element.

The principle of operation of the pre-compression structure described above will be described below in connection with some embodiments of the gas sensor structure. It will be appreciated by those skilled in the art that these embodiments of the gas sensor structure are merely some non-limiting bodies of implementation provided by the present utility model, and are intended to clearly illustrate the main concepts of the present utility model and to provide some specific solutions for public implementation, not to limit the overall manner or function of the pre-compression structure. Similarly, the pre-compression structure is only a non-limiting embodiment provided by the present utility model, and is not limited to the implementation of the subject gas sensor structure.

Referring to fig. 2 and 3 in combination, fig. 2 is a schematic structural view of a pre-pressing structure according to some embodiments of the present utility model, and fig. 3 is a schematic structural view of a contact terminal in the pre-pressing structure according to some embodiments of the present utility model.

As shown in fig. 2, in some non-limiting embodiments of the present utility model, the pre-pressing structure 200 of the gas sensor mainly includes a terminal holder 210 having an accommodating space 211 therein for accommodating at least one pair of contact terminals 220; and at least one pair of contact terminals 220 oppositely disposed in the accommodation space 211. Alternatively, the contact terminal 220 may be a metal structure.

The receiving space 211 may include at least one pair of terminal fixing passages to correspond to the at least one pair of contact terminals 220 introduced, the at least one pair of terminal fixing passages being disposed opposite to each other. The distance between the opposite faces of the two terminal-fixing channels in each pair is the lateral distance d of the accommodation space 211.

Further, as shown in fig. 3, each contact terminal 220 includes a terminal body 221 and an elastic bending portion 222. The elastic bending portion 222 is bent along the upper end of the terminal body 221 toward the center of the terminal holder 210 and extends downward away from the terminal body 221. Referring to fig. 2 and 3, the elastic bending part 222 has a bending width h in a lateral direction greater than half of a lateral distance d of the receiving space 211 in a natural state.

The terminal bodies 221 of the at least one pair of contact terminals 220 are detachably fixed in the corresponding at least one pair of terminal fixing passages in the accommodation space 211.

Further, the process of assembling the contact terminal 220 into the terminal holder 210 may include: first, the corresponding two metal contact terminals 220 are respectively loaded into a movable jig (not shown in the drawings). The movable clamp is closed to a target position in a fixed path, wherein the fixed path refers to a direction in which the contact terminals 220 are compressed with each other, and the target position refers to a position of the contact terminals 220 in the terminal holder 210. The bent width h of the contact terminal 220 in a natural state is compressed to a half d/2 of the lateral distance d corresponding to the accommodation space 211. Thereafter, the contact terminals 220 are pressed into the terminal holder 210 by a pressing tool, such as a profiling ram.

As shown in fig. 2, the elastic bent portions 222 of at least one pair of contact terminals 220 in the accommodation space 211 are in contact with each other in the lateral direction, and the bent width h of at least one pair of contact terminals 220 placed in the accommodation space 211 is precompressed by a portion of the bent width h as compared with the bent width h in the natural state.

Further, referring to fig. 4, fig. 4 illustrates a schematic diagram of a gas sensor structure provided in accordance with some embodiments of the present utility model.

As shown in fig. 4, the sheet sensor element 300 is inserted into the contact surface of at least one pair of contact terminals 220 in the pre-pressing structure 200 of the gas sensor, and is fixedly engaged with the terminal holder 210 by the elastic force of the elastic bending portions 222 of the at least one pair of contact terminals 220 in the center direction. The chip-type sensor element 300 may be a ceramic plate structure. When the sensor element 300 is mated with the contact terminal 220, if the sensor element 300 is shifted from the center position as shown in fig. 1, the contact terminal 220 can still provide a sufficient contact force due to the pre-compression amount.

In some preferred embodiments, please refer to fig. 5, fig. 5 shows a schematic structural diagram of a gas sensor structure provided according to other embodiments of the present utility model.

As shown in fig. 5, the pre-pressing structure 500 of the gas sensor may further include a plurality of pairs of contact terminals, for example, a first pair of contact terminals 520 and a second pair of contact terminals 520, two of each pair of contact terminals 520, 530 being disposed opposite to each other in the receiving space 511 of the terminal holder 510. The pre-pressing contact surfaces of the pairs of contact terminals 520 and 530, which are in contact with each other and are pressed against each other, are all at the same height, so that clamping force from the periphery is provided for the central sensing element 300 on the same plane, thereby improving the contact force between the sensing element 300 and the central sensing element 300, and avoiding the deviation of the central position of the sensing element 300 caused by insufficient contact force in the dynamic assembly process.

Further, in some alternative embodiments, as depicted in fig. 5, the containment space 511 is a regular space unique to the lateral distance d. The pairs of contact terminals 520, 530 are oppositely disposed in the accommodation space 511 having a unique lateral distance d, and the bending width h of the elastic bending portion of each pair of contact terminals 520, 530 in the lateral direction in a natural state is greater than half of the unique lateral distance d.

In alternative embodiments, the accommodating space 511 is an irregular space (not shown in the drawings) with a non-unique lateral distance d. The pairs of contact terminals 520, 530 are oppositely disposed in the accommodation space 511 having a non-unique lateral distance d, and the bending width h of the elastic bending portion of each pair of contact terminals 520, 530 in the lateral direction in a natural state is greater than half of the corresponding lateral distance d.

Further, referring to fig. 6, fig. 6 shows a schematic top view of the contact surface of the contact terminal in the gas sensor in the prior art.

The prior art contact surfaces are planar and when there is assembly tolerance for the contact terminals 110, the contact surfaces tend to become single point contacts. As shown in fig. 6, in the partial enlarged view I, the corresponding pair of contact terminals 110 cannot always be in ideal full contact with the sensor element 130 due to manufacturing, dynamic assembly, and other reasons. If a single point contact occurs in which the contact surface of the contact terminal 110 is deflected in the partial enlarged view I, the single point contact of the contact terminal 110 is easily separated from contact over a long period of time.

In order to improve the contact condition of the corresponding contact terminal, please refer to fig. 7, fig. 7 is a schematic top view of the contact surface of the contact terminal according to some embodiments of the present utility model.

As shown in fig. 7, in the partial enlarged view II of the pre-pressing structure 500, the contact surfaces of the pairs of contact terminals 520, 530, which are in contact with each other, may be designed in the form of circular arcs protruding outward. Thus, even when the contact terminals 520, 530 are deflected, a good contact state can be maintained, and the contact terminals 520, 530 are not easily separated from contact, thereby improving the contact problem caused by processing and assembly errors.

In summary, the present utility model provides a pre-pressing structure of a gas sensor and a gas sensor, which can always keep the center of a sensor element and a contact terminal centered in a dynamic assembly process, and the contact terminal can also provide enough contact force to fix the sensor element.

The previous description of the disclosure is provided to enable any person skilled in the art to make or use the disclosure. Various modifications to the disclosure will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other variations without departing from the spirit or scope of the disclosure. Thus, the disclosure is not intended to be limited to the examples and designs described herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. A pre-pressing structure of a gas sensor, comprising:

a terminal holder having an accommodation space provided therein for accommodating at least one pair of contact terminals; and

the at least one pair of contact terminals are oppositely arranged in the accommodating space, each contact terminal comprises a terminal body and an elastic bending part, the elastic bending part bends towards the center direction of the terminal retainer along the upper end of the terminal body and extends towards the lower side far away from the terminal body, and the bending width of the elastic bending part in the transverse direction in a natural state is larger than half of the transverse distance of the accommodating space.

2. The pre-compression structure according to claim 1, wherein the elastic bent portions of the at least one pair of contact terminals in the accommodation space are in contact with each other in a lateral direction and each are pre-compressed by a portion of a bending width.

3. The pre-compression structure of claim 2, wherein the at least one pair of contact terminals comprises a plurality of pairs of contact terminals, and the pre-compression contact surfaces of the pairs of contact terminals that contact each other are all at the same height.

4. A pre-compression structure according to claim 3, wherein the pairs of contact terminals are oppositely disposed in the accommodation spaces having unique lateral distances, and the resilient bending portions of the contact terminals of each pair have a bending width in the lateral direction of more than half of the unique lateral distances in a natural state.

5. A pre-pressing structure according to claim 3, wherein the pairs of contact terminals are oppositely disposed in the accommodation spaces whose lateral distances are not unique, and the resilient bending portions of the contact terminals of each pair have a bending width in the lateral direction greater than half of the corresponding lateral distances in a natural state.

6. The pre-pressing structure of claim 1, wherein the contact surfaces of the at least one pair of contact terminals that are in contact with each other are arc surfaces.

7. The pre-compression structure of claim 1, wherein the receiving space includes at least one pair of terminal fixing passages to be correspondingly introduced into the at least one pair of contact terminals, the at least one pair of terminal fixing passages are disposed opposite to each other, and a distance between opposite faces of the two terminal fixing passages is the lateral distance.

8. The pre-compression structure of claim 7, wherein the terminal bodies of the at least one pair of contact terminals are removably secured in the corresponding at least one pair of terminal securing passages.

9. The pre-compression structure of claim 1, wherein the contact terminals are metallic structures.

10. A gas sensor structure, comprising:

a pre-compression structure of a gas sensor according to any one of claims 1 to 9; and

and the sensing element is inserted into the contact surfaces of the at least one pair of contact terminals, which are contacted and pressed mutually, and is fixedly clamped by the elastic force of the elastic bending parts of the at least one pair of contact terminals towards the center direction of the terminal retainer.

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