Fast-response temperature measuring element

Abstract

The utility model provides a kind of fast response temperature measuring element, including shell, shell has first end and second end, shell includes connecting section and temperature measuring section, temperature measuring piece is equipped in shell, temperature measuring piece is located in temperature measuring section;First heat conduction layer is set in shell, and with first heat conduction layer and connecting section correspond;Second heat conduction layer is set in shell, and with second heat conduction layer and temperature measuring section correspond, the heat conductivity of second heat conduction layer is greater than the heat conductivity of first heat conduction layer.The utility model can realize fast response, so that temperature measuring element accurately, quickly detects the temperature of the environment to be measured.

Description

Technical Field

[0001] This utility model relates to the field of temperature detection technology, and in particular to a fast-response temperature sensing element. Background Technology

[0002] With the continuous advancement of technology, the development of temperature sensors is trending towards higher temperatures, higher precision, and faster response. Sheathed resistance temperature detectors (RTDs) utilize the change in resistance of a substance due to temperature changes to measure temperature. When the resistance changes, the instrument displays the temperature value corresponding to that change.

[0003] In the prior art, the thermally conductive insulating material filled in temperature sensors is usually magnesium oxide (MgO) powder. However, the physical property of magnesium oxide insulating material, with a thermal conductivity of only 29-36 W / (m·K), severely limits the heat conduction efficiency. The design matching between the armor tube diameter and the insulation layer thickness has not yet reached the optimal state. At the same time, defects in the filling process lead to the existence of porosity in the insulation layer, which significantly increases the thermal resistance effect, resulting in a slow response time of the temperature sensor. Summary of the Invention

[0004] This invention provides a fast-response temperature sensing element to solve the problem of slow response time in existing temperature sensors.

[0005] This utility model provides a fast-response temperature sensing element, which includes:

[0006] The housing has a first end and a second end, the housing includes a connecting section and a temperature measuring section, and a temperature measuring element is provided inside the housing, the temperature measuring element being located within the temperature measuring section;

[0007] A first heat-conducting layer is disposed inside the outer shell and corresponds to the first heat-conducting layer and the connecting section;

[0008] A second heat-conducting layer is disposed inside the outer casing and corresponds to the temperature measuring section. The thermal conductivity of the second heat-conducting layer is greater than that of the first heat-conducting layer.

[0009] In one embodiment of this utility model, the first thermally conductive layer is a magnesium oxide layer.

[0010] In one embodiment of this utility model, the second thermally conductive layer is a boron nitride layer.

[0011] In one embodiment of this utility model, the diameter of the temperature measuring section is smaller than the diameter of the connecting section.

[0012] In one embodiment of the present invention, a transition section is provided between the connecting section and the temperature measuring section, one end of the transition section is connected to the connecting section, and the other end of the transition section is connected to the temperature measuring section.

[0013] In one embodiment of the present invention, the diameter of the transition section gradually decreases along the extension direction from the connecting section to the temperature measuring section.

[0014] In one embodiment of the present invention, the fast-response temperature measuring element further includes a fixing sleeve, which is disposed at the first end of the outer shell, and the outer shell passes through the fixing sleeve.

[0015] In one embodiment of the present invention, a sealing groove is provided on the fixing sleeve, the sealing groove is connected to the internal space of the connecting section, and a sealing element for sealing the first end is provided in the sealing groove.

[0016] In one embodiment of the present invention, the fast-response temperature sensing element further includes a lead wire for transmitting temperature. The lead wire passes through the first thermally conductive layer and the sealing element in sequence and is exposed outside the housing. The lead wire is welded to the temperature sensing element.

[0017] In one embodiment of the present invention, the second end is provided with a plug for sealing the second end.

[0018] The beneficial effects of this utility model are:

[0019] (1) In this utility model, due to the provision of a second heat-conducting layer, and the fact that the second heat-conducting layer corresponds to the temperature measuring element, the temperature measuring element is located inside the second heat-conducting layer. At the same time, the high thermal conductivity of the second heat-conducting layer can quickly transfer heat to the temperature measuring element, ensuring that temperature changes can be detected in a timely and accurate manner. Compared with the prior art, this utility model can achieve a rapid response and accurately and quickly detect the temperature of the element to be measured.

[0020] (2) Compared with the prior art, in this utility model, the first heat-conducting layer can protect the lead wire and achieve insulation function, while the second heat-conducting layer can achieve accurate temperature transmission and improve the overall performance of the fast-response temperature sensing element. Attached Figure Description

[0021] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. It is obvious that the drawings described below are merely some embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0022] In the attached diagram:

[0023] Figure 1 This is a schematic diagram of a structure provided for an embodiment of the present utility model;

[0024] Figure 2This is a schematic diagram of another embodiment provided in one embodiment of the present utility model.

[0025] The attached figures are labeled as follows:

[0026] 1. Outer shell, 101. Connecting section, 102. Temperature measuring section, 103. Heating section, 104. First end, 105. Second end, 2. First heat-conducting layer, 3. Second heat-conducting layer, 4. Temperature measuring element, 5. Lead wire, 6. Fixing sleeve, 7. Sealing element, 8. Plug. Detailed Implementation

[0027] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0028] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. The drawings only show the components related to the present invention and are not drawn according to the actual number, shape and size of the components. In actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0029] In the following description, numerous details are explored to provide a more thorough explanation of embodiments of the present invention. However, it will be apparent to those skilled in the art that embodiments of the present invention may be practiced without these specific details. In other embodiments, well-known structures and devices are shown in block diagram form rather than in detail to avoid obscuring embodiments of the present invention.

[0030] Please see Figure 1 and Figure 2 This utility model proposes a fast-response temperature sensing element.

[0031] In one exemplary embodiment, the temperature detector includes:

[0032] The outer casing 1 has a first end 104 and a second end 105. The outer casing 1 includes a connecting section 101 and a temperature measuring section 102. A temperature measuring element 4 is provided inside the outer casing 1 and is located inside the temperature measuring section 102.

[0033] The first heat-conducting layer 2 is disposed inside the outer shell 1 and corresponds to the first heat-conducting layer 2 and the connecting section 101;

[0034] The second heat-conducting layer 3 is disposed inside the outer shell 1 and corresponds to the temperature measuring section 102. The thermal conductivity of the second heat-conducting layer 3 is greater than that of the first heat-conducting layer 2.

[0035] In this embodiment, due to the provision of the second heat-conducting layer 3, and the fact that the second heat-conducting layer 3 corresponds to the temperature measuring element 4, the temperature measuring element 4 is located inside the second heat-conducting layer 3. At the same time, the high thermal conductivity of the second heat-conducting layer 3 can quickly transfer heat to the temperature measuring element 4, ensuring that temperature changes can be detected in a timely and accurate manner.

[0036] It is worth noting that since the temperature is measured by the change in resistance of the temperature sensing element 4, the resistance of the temperature sensing element 4 is sensitive to temperature and responds quickly. However, the lack of thermal conductive material leads to slow heat transfer. In contrast, this invention can achieve a fast response by setting a second thermal conductive layer 3, and the resistance of the temperature sensing element changes accurately and quickly with the temperature.

[0037] For example, in this embodiment, the outer shell 1 is made of a metal material with high thermal conductivity, which can carry out efficient heat conduction.

[0038] It is worth noting that in this embodiment, the thermal conductivity of the first heat-conducting layer 2 and the second heat-conducting layer 3 are different. By reasonably designing the thickness and materials of the two, the heat distribution uniformity within the temperature measurement section 102 can be achieved, avoiding the influence of local overheating or overcooling on the temperature measurement results.

[0039] It should also be noted that in this embodiment, the temperature measuring element 4 is a thermal resistance thin film element or a thermal resistance wire element, used for temperature measurement and data transmission.

[0040] In an exemplary embodiment, the first thermally conductive layer 2 is a magnesium oxide layer, and the second thermally conductive layer 3 is a boron nitride layer.

[0041] In this embodiment, since boron nitride has a high thermal conductivity, it can quickly transfer heat to the temperature sensing element 4, ensuring that temperature changes can be detected in a timely manner. At the same time, the high thermal conductivity of boron nitride helps to improve the response speed and accuracy of the temperature sensing element.

[0042] For example, in this embodiment, the outer shell 1 is a hollow tubular structure. The first heat-conducting layer 2 and the second heat-conducting layer 3 are located on the left and right sides of the outer shell 1, respectively. The second heat-conducting layer 3 is set according to the specific length of the temperature measuring element 4. The second heat-conducting layer 3 needs to completely wrap the temperature measuring element 4 in order to achieve rapid heat conduction.

[0043] For example, in this embodiment, the thermal conductivity of boron nitride (BN) is about 300 W / (m·K), and the thermal conductivity of magnesium oxide (MgO) is about 29-36 W / (m·K). Therefore, the selected second thermal conductive layer 3 has higher sensitivity than conventional magnesium oxide thermal conductivity and can achieve a fast response.

[0044] It is worth noting that other materials with better thermal conductivity, such as diamond, can also be used in this embodiment, with a thermal conductivity of approximately 2000 W / (m·K).

[0045] In an exemplary embodiment, the diameter of the temperature measuring section 102 is smaller than the diameter of the connecting section 101.

[0046] In this embodiment, by using a tube shrinking process on the temperature measuring section 102, the diameter of the temperature measuring section 102 is made smaller than the diameter of the connecting section 101, thereby increasing the density of the second heat-conducting layer 3 of the temperature measuring section 102, which can further improve heat conduction and increase the response time of the temperature measuring element 4.

[0047] For example, a transition section is provided between the connecting section 101 and the temperature measuring section 102. One end of the transition section is connected to the connecting section 101, and the other end of the transition section is connected to the temperature measuring section 102. The transition section is also filled with a second thermally conductive layer 3.

[0048] For example, along the extension direction from the connecting section 101 to the temperature measuring section 102, the diameter of the transition section gradually decreases, thereby enabling the function of reducing the diameter from the connecting section 101 to the temperature measuring section 102.

[0049] It is worth noting that in this embodiment, since the diameter of the temperature measuring section 102 is smaller than the diameter of the connecting section 101, it can measure the temperature in narrow areas. Compared with traditional temperature measuring elements, it has more flexible installation positions and a wider range of applications.

[0050] In one exemplary embodiment, the fast-response temperature sensing element further includes a fixing sleeve 6, which is disposed at the first end 104 of the housing 1, and the housing 1 passes through the fixing sleeve 6.

[0051] In this embodiment, the fixing sleeve 6 is used to fix the outer shell 1, and at the same time provides a sealing environment for the first end 104 of the sealing outer shell 1.

[0052] For example, the fixing sleeve 6 has a sealing groove that communicates with the internal space of the connecting section 101. The sealing groove is provided with a sealing element 7 for sealing the first end 104. In this embodiment, the sealing element 7 is epoxy resin filled in the sealing groove, which can protect the lead wire 5 and the solder joint, and also serve as a waterproof function.

[0053] For example, in this embodiment, the second end 105 of the outer casing 1 is provided with a plug 8, which is a metal part. The plug 8 is welded to the second end 105 of the outer casing 1 to seal the second end 105 of the outer casing 1, preventing the second heat-conducting layer 3 from communicating with the external environment and improving the sealing performance of the entire fast-response temperature sensing element. In this embodiment, the second end of the outer casing 1 can also be sealed by providing filler to prevent the second heat-conducting layer 3 from directly communicating with the external environment.

[0054] In an exemplary embodiment, the fast-response temperature sensing element further includes a lead 5 for transmitting an electrical signal. The lead 5 passes through the first thermally conductive layer 2 and the sealing member 7 in sequence and is exposed outside the housing 1. The lead 5 is welded to the temperature sensing element 4.

[0055] In this embodiment, the lead wire 5 enables an external receiving device to receive the resistance output value of the temperature measuring element 4, read the current resistance of the temperature measuring element 4, and then convert it into a corresponding digital signal to realize the temperature detection of the current environment.

[0056] In summary, this invention enables rapid response and accurate and fast detection of the temperature of the component under test.

[0057] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. A fast-response temperature-measuring element, characterized by include: The housing has a first end and a second end, the housing includes a connecting section and a temperature measuring section, and a temperature measuring element is provided inside the housing, the temperature measuring element being located within the temperature measuring section; A first heat-conducting layer is disposed inside the outer shell and corresponds to the first heat-conducting layer and the connecting section; A second heat-conducting layer is disposed inside the outer casing and corresponds to the temperature measuring section. The thermal conductivity of the second heat-conducting layer is greater than that of the first heat-conducting layer.

2. The fast-response temperature-measuring element according to claim 1, characterized in that: The first thermally conductive layer is a magnesium oxide layer.

3. The fast-response temperature-measuring element according to claim 1, characterized in that: The second thermally conductive layer is a boron nitride layer.

4. The fast-response temperature-measuring element according to claim 1, characterized in that: The diameter of the temperature measuring section is smaller than the diameter of the connecting section.

5. The fast-response temperature-measuring element according to claim 1, characterized in that: A transition section is provided between the connecting section and the temperature measuring section. One end of the transition section is connected to the connecting section, and the other end of the transition section is connected to the temperature measuring section.

6. The fast-response temperature-measuring element according to claim 5, characterized in that: Along the extension direction from the connecting section to the temperature measuring section, the diameter of the transition section gradually decreases.

7. The fast-response temperature sensing element according to claim 1, characterized in that: The fast-response temperature sensing element also includes a fixing sleeve, which is disposed at the first end of the outer shell, and the outer shell passes through the fixing sleeve.

8. The fast-response temperature-measuring element according to claim 7, characterized in that: The fixing sleeve has a sealing groove, which communicates with the internal space of the connecting section, and a sealing element for sealing the first end is provided in the sealing groove.

9. The fast-response temperature-measuring element according to claim 7, characterized in that: The fast-response temperature sensing element also includes a lead wire for transmitting temperature. The lead wire passes through the first thermally conductive layer and the sealing element in sequence and is exposed outside the housing. The lead wire is welded to the temperature sensing element.

10. The fast-response temperature-measuring element according to claim 1, characterized in that: The second end is provided with a plug for sealing the second end.

Images