Protection assembly and temperature sensor

Abstract

The utility model relates to the technical field of sensors, in particular to a protection assembly and a temperature sensor. The protection assembly comprises a first sleeve, a silica gel filling piece, a shell and an epoxy glue filling piece. The first sleeve is provided with a first mounting space capable of placing the sensitive element, and a silica gel filling piece is filled between the first mounting space and the sensitive element; the shell is provided with a second installation space, the first sleeve is arranged in the second installation space, and the first sleeve and the second installation space are filled with epoxy glue filling pieces. According to the application, the silica gel filling piece and the epoxy glue filling piece both belong to silicone rubber materials, the stress at the sensitive element is relatively small by utilizing the silica gel filling piece and the epoxy glue filling piece, and when the sensitive element is in a vibration environment, the thermosensitive element cannot be damaged and cannot be broken, so that the sensitive element is more stable and more reliable; in addition, the silica gel has a high heat conduction coefficient, so that the thermal response time of the product is shortened, and the product is more sensitive.

Description

Technical Field

[0001] The present application relates to the field of sensor technology, and in particular to a protective component and a temperature sensor. Background Art

[0002] The existing protection components usually pre-install the platinum thermal resistor inside the shell and then use epoxy glue or polyurethane to potting; however, this existing structure has the following disadvantages:

[0003] (1) When platinum thermal resistors are encapsulated with epoxy or polyurethane, the encapsulation glue itself has a large stress. Long-term use in a vibration environment will cause the platinum thermal resistor to be damaged and the pins to break due to stress, shortening the product life.

[0004] (2) After the platinum thermal resistor is encapsulated with epoxy glue or polyurethane, the thermal response time of the protection component as a whole will be prolonged due to the low thermal conductivity of the encapsulating glue itself.

[0005] (3) Due to the small internal space, the product cannot provide sufficient electrical clearance and creepage distance, resulting in insufficient dielectric strength. It cannot be used in high-voltage environments and usually cannot meet the dielectric strength of 5000V, 1min.

[0006] Therefore, there is an urgent need for a protective component and a temperature sensor to solve the technical problems existing in the prior art to a certain extent. Utility Model Content

[0007] The purpose of this application is to provide a protective component and a temperature sensor to improve the thermal response speed of the temperature sensor to a certain extent, reduce the thermal response time of the product, and ensure long-term temperature operation under vibration conditions.

[0008] The present application provides a protection assembly, which is applied to a sensitive element in a temperature sensor, and includes a first sleeve, a silicone filler, a housing, and an epoxy filler;

[0009] The first sleeve has a first installation space capable of placing the sensitive element, and the silica gel filler is filled between the first installation space and the sensitive element;

[0010] The shell has a second installation space, the first sleeve is arranged in the second installation space, and the first sleeve and the second installation space are filled with the epoxy filler.

[0011] In the above technical solution, further, the sensitive element includes a sensitive element body and a sensitive element pin connected to the sensitive element body;

[0012] One end of the first sleeve close to the main body of the sensitive element abuts against the housing.

[0013] In the above technical solution, further, there is a preset distance between the end of the first sleeve abutting against the shell and the sensitive element.

[0014] In the above technical solution, further, the protection assembly also includes a third sleeve;

[0015] The third sleeve is sleeved with the pin of the sensitive element.

[0016] In the above technical solution, further, the protective component also includes a heat shrink tubing;

[0017] One end of the heat shrinkable sleeve is sleeved with at least a portion of the first sleeve, and the other end extends along the direction from the sensitive element body to the sensitive element pin.

[0018] In the above technical solution, further, the heat shrinkable tube is a multi-layer structure.

[0019] In the above technical solution, further, the heat shrinkable tube is a two-layer structure.

[0020] In the above technical solution, further, the material of the first sleeve is polytetrafluoroethylene.

[0021] In the above technical solution, further, the third sleeve is made of Teflon material.

[0022] The present application also provides a temperature sensor, comprising the above-mentioned protection component.

[0023] Compared with the prior art, the beneficial effects of this application are:

[0024] The present application provides a protective assembly, which is applied to a sensitive element in a temperature sensor; it includes a first sleeve, a silicone filler, a housing, and an epoxy filler;

[0025] The first sleeve has a first installation space capable of placing the sensitive element, and the silica gel filler is filled between the first installation space and the sensitive element;

[0026] The shell has a second installation space, the first sleeve is arranged in the second installation space, and the first sleeve and the second installation space are filled with the epoxy filler.

[0027] In summary, the silicone filler and epoxy filler of the present application are both made of silicone rubber. The use of silicone fillers and epoxy fillers reduces the stress on sensitive components. When in a vibrating environment, the thermistor will not be damaged or break, making it more stable and reliable. In addition, silicone has a high thermal conductivity coefficient, which reduces the thermal response time of the product and makes it more sensitive.

[0028] The present application also provides a temperature sensor, including the above-mentioned protection component, and thus has all the beneficial effects of the temperature sensor, which will not be elaborated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0030] Figure 1 A schematic diagram of the structure of the protection component provided in Example 1 of the present application;

[0031] Figure 2 A schematic diagram of the structure of a hidden shell in a protective assembly provided in Embodiment 1 of the present application at a first viewing angle;

[0032] Figure 3 A schematic diagram of the structure of a hidden shell in a protective assembly provided in Embodiment 1 of the present application at a second viewing angle;

[0033] Figure 4 for Figure 3 A schematic diagram of the enlarged structure at A in the middle;

[0034] Figure 5 A cross-sectional view of a protective assembly provided in Embodiment 1 of the present application;

[0035] Figure 6 A diagram showing a preset distance in a protection component provided in Example 1 of the present application;

[0036] Figure 7 A schematic diagram of the structure of the third sleeve in the protection assembly provided in Example 2 of the present application;

[0037] Figure 8 for Figure 7 A schematic diagram of the enlarged structure at B in the middle;

[0038] Fig. 9 A cross-sectional view of a protective assembly provided in Embodiment 2 of the present application;

[0039] Fig.10 This is a cross-sectional view of the protective component provided in Example 3 of the present application.

[0040] Reference numerals:

[0041] 2-first sleeve; 3-housing; 4-silicone filler; 5-epoxy filler; 6-sensitive element body; 7-sensitive element pin; 8-third sleeve; 9-heat shrink sleeve; 10-first layer; 11-second layer; 12-first installation space; 13-wire shielding position. DETAILED DESCRIPTION

[0042] The following specific embodiments are provided to help the reader obtain a comprehensive understanding of the methods, devices and / or systems described herein. However, after understanding the disclosure of the present application, various changes, modifications and equivalents of the methods, devices and / or systems described herein will be apparent. For example, the order of operations described herein is merely an example, and is not limited to the order set forth herein, but in addition to the operations that must occur in a particular order, changes that will be apparent after understanding the disclosure of the present application may be made. In addition, in order to improve clarity and brevity, descriptions of features known in the art may be omitted.

[0043] The features described herein may be implemented in different forms and should not be interpreted as being limited to the examples described herein. Rather, the examples described herein have been provided only to illustrate some of the many possible ways of implementing the methods, devices and / or systems described herein that will be apparent after understanding the disclosure of the present application.

[0044] Throughout the specification, when an element (such as a layer, a region, or a substrate) is described as being “on”, “connected to”, “bound to”, “over”, or “covering” another element, it may be directly “on”, “connected to”, “bound to”, “over”, or “covering” another element, or one or more other elements may be present between them. In contrast, when an element is described as being “directly on”, “directly connected to”, “directly bound to”, “directly over”, or “directly covering” another element, there may be no other elements present between them.

[0045] As used herein, the term "and / or" includes any one of the associated listed items and any combination of any two or more items.

[0046] Although terms such as "first," "second," and "third" may be used herein to describe various members, components, regions, layers, or portions, these members, components, regions, layers, or portions are not limited by these terms. Rather, these terms are only used to distinguish one member, component, region, layer, or portion from another member, component, region, layer, or portion. Therefore, without departing from the teachings of the examples described herein, the first member, component, region, layer, or portion referred to may also be referred to as the second member, component, region, layer, or portion.

[0047] For ease of description, spatial relational terms such as "above", "upper", "below", and "lower" may be used herein to describe the relationship of one element to another element as shown in the accompanying drawings. Such spatial relational terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the accompanying drawings. For example, if the device in the accompanying drawings is turned over, an element described as being "above" or "upper" relative to another element will subsequently be "below" or "lower" relative to the other element. Therefore, the term "above" includes both "above" and "below" orientations depending on the spatial orientation of the device. The device may also be positioned in other ways (e.g., rotated 90 degrees or in other orientations), and the spatial relational terms used herein will be interpreted accordingly.

[0048] The terms used herein are only used to describe various examples and are not used to limit the present disclosure. Unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. The terms "include", "comprise" and "have" list the stated features, quantities, operations, components, elements and / or their combinations that exist, but do not exclude the existence or addition of one or more other features, quantities, operations, components, elements and / or their combinations.

[0049] Variations in the shapes shown in the drawings may occur due to manufacturing techniques and / or tolerances. Therefore, the examples described herein are not limited to the specific shapes shown in the drawings but include variations in shapes that occur during manufacturing.

[0050] The features of the examples described herein may be combined in various ways that will be apparent after understanding the disclosure of the present application. In addition, although the examples described herein have various configurations, other configurations are possible as will be apparent after understanding the disclosure of the present application.

[0051] Embodiment 1

[0052] Combine the following Figure 1-Figure 6 A protective component provided by the present application is described in detail.

[0053] In this embodiment, a protective component is provided, which is used to protect the sensitive element in the temperature sensor. Specifically, the protective component includes a first sleeve 2, a silicone filler 4, a shell 3 and an epoxy filler 5; further, the first sleeve 2 is a cylinder with two ends open, and has a first installation space 12 inside, the first installation space 12 is used to place the sensitive element, and the remaining space in the first installation space 12 except the sensitive element is filled with the silicone filler 4; further, the shell 3 is a cylinder with one end closed and the other end open, and has a second installation space, and the first sleeve 2 is arranged in the second installation space; further, the diameter of the first sleeve 2 is smaller than the diameter of the shell 3, and the epoxy filler 5 is filled between the first sleeve 2 and the shell 3.

[0054] In summary, the silicone filler 4 and epoxy filler 5 of the present application are both made of silicone rubber. The use of the silicone filler 4 and epoxy filler 5 reduces the stress on the sensitive components. When in a vibrating environment, the thermistor will not be damaged or break, and it is more stable and reliable. In addition, silicone has a high thermal conductivity coefficient, which reduces the thermal response time of the product and makes it more sensitive.

[0055] Specifically, the material of the first sleeve 2 is polytetrafluoroethylene; wherein polytetrafluoroethylene (PTFE) is a synthetic tetrafluoroethylene fluoropolymer with a variety of applications. It is one of the most famous and widely used PFAS. A well-known brand name for PTFE-based synthetics is Chemours' Teflon, which is a derivative product of DuPont, which originally discovered this compound in 1938. In addition, polytetrafluoroethylene is a fluorocarbon solid because it is a high molecular weight polymer composed entirely of carbon and fluorine. PTFE is hydrophobic: neither water nor aqueous substances will wet PTFE because fluorocarbons exhibit only small London dispersion forces due to the low electrical polarization of fluorine. PTFE has one of the lowest coefficients of friction among all solids.

[0056] Specifically, the sensitive element includes a sensitive element body 6 and a sensitive element pin 7 connected to the sensitive element body 6 ; one end of the first sleeve 2 close to the sensitive element body 6 abuts against the bottom of the housing 3 .

[0057] It is worth noting that the sensitive element in the present application can be a two-wire system, a three-wire system, or a four-wire system.

[0058] More specifically, there is a preset distance H between the end of the first sleeve 2 that abuts against the housing 3 and the sensitive element.

[0059] Preferably, H is set between 3mm-10mm.

[0060] In summary, the setting of the preset distance ensures that there is an electrical gap between the thermal element and the housing 3 .

[0061] Embodiment 2

[0062] Combination Figure 7-Figure 9 A protective component provided in this embodiment of the present application is described in detail.

[0063] In this embodiment, the protection component further includes a third sleeve 8; the third sleeve 8 is a cylindrical structure with open ends at both ends; specifically, the third sleeve 8 is sleeved with the sensitive element pin 7; further, the third sleeve 8 is made of Teflon material.

[0064] Furthermore, the third sleeve 8 is made of Teflon (Teflon is polytetrafluoroethylene); Teflon has the following advantages: (1) Non-stickiness: Almost all substances do not adhere to the polytetrafluoroethylene coating. Even a very thin film shows good non-stick properties. (2) Heat resistance: The polytetrafluoroethylene coating has excellent heat and low temperature resistance. It can withstand high temperatures up to 300°C for a short time, and can generally be used continuously between 240°C and 260°C. It has significant thermal stability. It can work at freezing temperatures without becoming brittle, and does not melt at high temperatures. (3) Sliding property: The polytetrafluoroethylene coating has a low friction coefficient. The friction coefficient changes when the load slides, but the value is only between 0.05-0.15. (4) Moisture resistance: The surface of the polytetrafluoroethylene coating does not stick to water and oil, and is not easily sticky to solutions during production operations. If there is a small amount of dirt, it can be removed by simply wiping. The downtime is short, saving work time and improving work efficiency.

[0065] Embodiment 3

[0066] Combination Fig.10 A protection component provided in this embodiment is described in detail.

[0067] In this embodiment, the protection component further includes a heat shrink tube 9; specifically, one end of the heat shrink tube 9 is sleeved on the first sleeve 2, and the other end extends in the direction from the sensitive element body 6 to the sensitive element pin 7. Furthermore, one end of the heat shrink tube 9 is sleeved on the first sleeve 2, and the other end extends to cover the wire shielding position 13, thereby providing sufficient electrical clearance and creepage distance, improving dielectric strength, and achieving a protection performance of no breakdown for 5 minutes under a 10000V withstand voltage environment.

[0068] Specifically, the heat shrinkable tube 9 is a multi-layer structure. Further, the heat shrinkable tube 9 is a two-layer structure, which is a first layer 10 and a second layer 11 , and the first layer 10 is sleeved on the second layer 11 .

[0069] Embodiment 4

[0070] The present application also provides a temperature sensor, including the above-mentioned protection component, and thus has all the beneficial effects of the temperature sensor, which will not be elaborated here.

[0071] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A protective component, applied to a sensitive element in a temperature sensor; characterized in that: It includes a first sleeve, a silicone filler, a shell and an epoxy filler; The first sleeve has a first installation space capable of placing the sensitive element, and the silica gel filler is filled between the first installation space and the sensitive element; The shell has a second installation space, the first sleeve is arranged in the second installation space, and the first sleeve and the second installation space are filled with the epoxy filler.

2. The protection assembly according to claim 1, characterized in that: The sensitive element comprises a sensitive element body and a sensitive element pin connected to the sensitive element body; One end of the first sleeve close to the main body of the sensitive element abuts against the housing.

3. The protection assembly according to claim 2, characterized in that: There is a preset distance H between the end of the first sleeve abutting against the housing and the sensitive element.

4. The protection assembly according to claim 2, characterized in that: The protection assembly also includes a third sleeve; The third sleeve is sleeved with the pin of the sensitive element.

5. The protection assembly according to claim 2, characterized in that: The protective assembly also includes a heat shrink tubing; One end of the heat shrinkable sleeve is sleeved with at least a portion of the first sleeve, and the other end extends along the direction from the sensitive element body to the sensitive element pin.

6. The protection assembly according to claim 5, characterized in that: The heat shrinkable tube is a multi-layer structure.

7. The protection assembly according to claim 6, characterized in that: The heat shrinkable tube has a two-layer structure.

8. The protection assembly according to claim 1, characterized in that: The first sleeve is made of polytetrafluoroethylene.

9. The protection assembly according to claim 4, characterized in that: The third sleeve is made of Teflon.

10. A temperature sensor, characterized in that: A protective component comprising any one of claims 1 to 9.

Images