CN217953725U - Probe subassembly and temperature sensor and vehicle including it - Google Patents

Abstract

The utility model relates to a probe subassembly (10) for temperature sensor, it includes: a probe (1) located at the front of the probe assembly (10), the probe (1) having a rigid sleeve (2); a lead (3) located behind the rigid sleeve (2); a transition sheath (4) covering at least a rear portion of the rigid sleeve (2) and a front portion of the lead wire (3). The utility model discloses still relate to the temperature sensor including above-mentioned probe assembly and the vehicle including above-mentioned temperature sensor.

Description

Probe subassembly and temperature sensor and vehicle including it

Technical Field

The utility model relates to a probe assembly for temperature sensor. The utility model discloses still relate to including probe assembly's temperature sensor and include temperature sensor's vehicle.

Background

An engine of a vehicle uses a temperature sensor to measure temperature to monitor the operating state of the engine, and in particular to measure the exhaust gas temperature of the engine exhaust system. Typically, the temperature sensor comprises a probe which can be fixed to a location where the temperature needs to be measured, for example in the exhaust duct of the engine. For thermocouple type temperature sensors used to measure higher temperatures, the probe comprises a junction formed by fusing together the ends of wires formed of different metals and transmits an electrical signal representative of the measured temperature through a lead to the vehicle's control system. The leads are typically covered with an insulating sheath to ensure reliability of the connection circuit and to eliminate electrical shorts. However, during use of the vehicle, the lead sometimes experiences drag or pulling, and its portion in close proximity to the probe becomes a region of stress concentration. In addition, since the portion of the lead wire in the immediate vicinity of the probe is also in a high-temperature environment, the wire sheath is accelerated in aging, and thus breakage is liable to occur. When the wire sheath of the lead wire is broken, the reliability of the temperature sensor is lowered, and the accuracy and precision of temperature measurement are deteriorated.

Therefore, there is a need for a probe assembly for a temperature sensor that can make the sheath of the portion of the lead wire immediately adjacent to the probe less susceptible to breakage, ensuring reliability of the temperature sensor and accuracy and precision of temperature measurement.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a probe subassembly for temperature sensor, it can be so that the line skin of lead wire does not take place the damage, improves temperature sensor's reliability and temperature measurement's precision and accuracy.

According to the utility model discloses a probe subassembly for temperature sensor includes: a probe at a front portion of the probe assembly, the probe having a rigid sleeve; a lead wire located behind the rigid sleeve; a transition sheath covering at least a rear portion of the rigid sleeve and a front portion of the lead. The transition sheath covering the rear part of the rigid sleeve of the probe and the front part of the lead wire protects the part of the lead wire close to the probe, and the wire sheath of the lead wire can not be damaged.

The probe assembly according to the present invention may also have one or more of the following features, alone or in combination.

According to an embodiment of the invention, the transition sheath is a separate component.

According to an embodiment of the invention, the transition sheath is formed of a material that can shrink at a certain temperature. The transition sheath has an inner diameter greater than the outer diameters of the rigid sleeve and the lead wire prior to contraction, and after contraction, the transition sheath fits snugly over the rear portion of the rigid sleeve and the front portion of the lead wire.

According to an embodiment of the invention, the lead has a protective sheath, which also covers the rear end of the rigid sleeve. At this rear end, the transition sheath is tightly fitted over the protective sheath outside the protective sheath, and the transition sheath is also fitted over a portion of the rigid sleeve that was not covered by the protective sheath before the rear end.

According to an embodiment of the invention, the length of the part of the transition sheath surrounding the rigid sleeve and protective casing is 26mm.

According to an embodiment of the invention, the lead has a protective sheath, the transition sheath being an extension of the protective sheath.

According to an embodiment of the invention, the inner diameter of the protective sheath is smaller than the outer diameter of the rigid sleeve, the transition sheath being formed by expansion of the protective sheath.

According to an embodiment of the invention, the length of the part of the transition sheath surrounding the rigid sleeve is larger than 30mm.

According to an embodiment of the invention, the protective sheath is formed of a high temperature resistant rubber material.

The utility model discloses still relate to a temperature sensor, it includes as above probe assembly.

The utility model discloses still relate to a vehicle, it includes as above temperature sensor.

Drawings

The above and other features and advantages of the present invention will become more apparent from the following detailed description of exemplary embodiments thereof, taken in conjunction with the accompanying drawings, which are given by way of illustration only and are not limitative of the scope of the invention in any way. The following drawings are not intended to be drawn to scale in actual size, with emphasis on illustrating the principles of the invention.

Fig. 1 shows a schematic view of a probe assembly for a temperature sensor according to the present invention;

FIG. 2 illustrates a cross-sectional view of a first embodiment of a transition sheath of the probe assembly.

FIG. 3 illustrates a cross-sectional view of a second embodiment of a transition sheath of the probe assembly.

Throughout the drawings, identical or similar parts are indicated by identical reference numerals.

Detailed Description

In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the following will combine the drawings of the embodiments of the present invention to carry out clear and complete description on the technical solution of the embodiments of the present invention.

Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs. The use of the words "a," "an," or "the" and similar referents in the specification and claims of the present application does not denote a limitation of quantity, but rather denotes the presence of at least one. The word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents.

Fig. 1 shows a probe assembly 10 for a temperature sensor according to the present invention.

As shown in FIG. 1, the probe assembly 10 includes a probe 1 located at the front of the probe assembly 10, the probe 1 having a rigid sleeve 2. The rigid sleeve 2 serves to protect the probe 1 and to fix the probe by means of a fixing, for example a screw, to position the probe at a location where a temperature measurement is required, for example in an exhaust duct of an engine. A lead wire 3 is arranged behind the rigid sleeve 2 for transmitting the electrical signals generated by the probe to a control system (not shown in the drawings) of the vehicle.

The lead 3 is generally a flexible cable, and may be swung or deformed by an external action such as dragging or pulling. Stress due to vibration, deformation, or the like, over the entire length of the lead wire 3 will concentrate on the front portion of the lead wire 3 immediately adjacent to the rigid sleeve 2, causing breakage of the front portion of the lead wire 3. To protect the front portion, the probe assembly 10 is provided with a transition sheath 4 that covers at least the rear portion of the rigid sleeve 2 and the front portion of the lead wire 3. The transition sheath 4 will protect the interface region and avoid the damage of the lead 3 caused by the stress.

Fig. 2 shows a cross-sectional view of a first embodiment of the transition sheath 4. As shown in fig. 2, the outer covering sheath 5 of the cable is formed, for example, of a high temperature resistant rubber material. The protective sheath 5 constitutes the insulating sheath of the lead 3. Typically, the protective sheath 5 of the lead 3 will cover only the lead 3, and not the rigid sleeve 2, or only the extreme end of the rigid sleeve 2. Thus, the stress generated in the lead wire 3 may cause the tip of the sheath 5 to break, or may be detached from the extreme end of the rigid casing 2 and then break.

To avoid this, the protective sheath 5 shown in fig. 2 continues to extend towards the rigid casing 2 and forms a transition sheath 4 from its extension. The inner diameter of the part of the protective sheath 5 covering the lead-through 3 is smaller than the outer diameter of the rigid sleeve 2. The protective sheath 5 is expanded at the extension of its rigid casing 2 extension to form a transition sheath 4 that closely surrounds the rigid casing 2. This tight surrounding prevents the transition sheath 4 from disengaging from the rigid casing 2. Furthermore, the length of the transition sheath 4, i.e. the extension of the protective sheath 5, surrounding the portion of the rigid casing 2 is greater than 30mm. This longer length also helps to prevent the transition sheath 4 from disengaging from the rigid casing 2.

Fig. 3 shows a cross-sectional view of a second embodiment of the transition sheath 4. As shown in fig. 3, the transition sheath 4 is a separate component. The transition sheath 4 is formed of a material that can shrink at a certain temperature. Before shrinking, the inner diameter of the transition sheath 4 is larger than the outer diameter of the rigid sleeve 2 and the lead wire 3. After retraction, the transition sheath 4 fits tightly over the rear of the rigid sleeve 2 and the front of the lead 3. This tight fit prevents the transition sheath 4 from slipping off its nested area. The length of the part of the transition sheath 4 surrounding the rigid sleeve 2 and the protective sheath 5 is 26mm. In particular, said transition sheath 4 is formed by a heat-shrinkable tube.

As shown in fig. 3, in this second embodiment, the protective sheath 5 of the lead 3 also covers the rear end of the rigid casing 2. At this rear end, the transition sheath 4 is tightly fitted over the protective sheath 5 on the outside of the protective sheath 5. The transition sheath 4 is also fitted over a portion of the rigid sleeve 2 not covered by the protective sheath 5 before the rear end. Although not shown in the drawings, it is envisaged that in this embodiment the protective sheath 5 may also cover only the lead 3, without covering the rigid sleeve 2, and may even not cover the front of the lead 3. That is, the rear of the rigid casing 2 and the front of the lead 3 are covered only by the transition sheath 4. It should be noted that the transition boot 4 still covers the front end of the protective boot 5 at this time, thereby preventing the front end of the protective boot 5 from being broken.

Illustratively, the probe assembly 10 may be used with a thermocouple type temperature sensor, such as an N-type thermocouple temperature sensor. The temperature sensor measures temperature in the range of-40 deg.c to 1050 deg.c and can bear peak temperature as high as 1150 deg.c. The rigid casing 2, the transition sheath 4 and the protective sheath 5 are all made of a material that can withstand high temperatures.

The foregoing is illustrative of the present invention and is not to be construed as limiting thereof. Although a few exemplary embodiments of this invention have been described, those skilled in the art will readily appreciate that many modifications are possible in the exemplary embodiments without materially departing from the novel teachings and advantages of this invention. Accordingly, all such modifications are intended to be included within the scope of this invention as defined in the claims. It is to be understood that the foregoing is illustrative of the present invention and that the invention is not to be considered limited to the specific embodiments disclosed, and that modifications to the disclosed embodiments, as well as other embodiments, are intended to be included within the scope of the invention.

Claims (11)

1. A probe assembly (10) for a temperature sensor, the probe assembly (10) comprising:

a probe (1) located at the front of the probe assembly (10), the probe (1) having a rigid sleeve (2);

a lead (3) located behind the rigid sleeve (2);

a transition sheath (4) covering at least a rear portion of the rigid sleeve (2) and a front portion of the lead wire (3).

2. The probe assembly (10) of claim 1,

the transition sheath (4) is a separate component.

3. The probe assembly (10) of claim 2,

the transition sheath (4) is formed of a material that can shrink at a temperature, the inner diameter of which before shrinking is greater than the outer diameter of the rigid sleeve (2) and the lead wire (3), the transition sheath (4) after shrinking fitting tightly over the rear of the rigid sleeve (2) and the front of the lead wire (3).

4. The probe assembly (10) of claim 3,

the lead (3) has a protective sleeve (5), said protective sleeve (5) also covering the rear end of the rigid sleeve (2), at which rear end the transition sheath (4) is tightly fitted over the protective sleeve (5) outside the protective sleeve (5), and the transition sheath (4) is also fitted over a portion of the rigid sleeve (2) not covered by the protective sleeve (5) before the rear end.

5. The probe assembly (10) of claim 4,

the length of the part of the transition sheath (4) surrounding the rigid sleeve (2) and the protective sleeve (5) is 26mm.

6. The probe assembly (10) of claim 1,

the lead (3) has a protective sheath (5), the transition sheath (4) being an extension of the protective sheath (5).

7. The probe assembly (10) of claim 6,

the inner diameter of the protective sleeve (5) is smaller than the outer diameter of the rigid casing (2), and the transition sheath (4) is formed by expanding the protective sleeve (5).

8. The probe assembly (10) of claim 6 or 7,

the length of the part of the transition sheath (4) surrounding the rigid sleeve (2) is more than 30mm.

9. The probe assembly (10) according to any one of claims 4 to 7,

the protective sleeve (5) is made of high-temperature-resistant rubber material.

10. A temperature sensor, characterized in that it comprises a probe assembly (10) according to any one of claims 1 to 9.

11. A vehicle characterized in that it comprises a temperature sensor according to claim 10.

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