Temperature measuring probe

Abstract

The utility model discloses a temperature measuring probe, comprising a pipe fitting, one end of the pipe fitting is provided with a probe assembly, the other end of the pipe fitting is provided with a ceramic cap, the pipe fitting is internally provided with a main control board and an antenna board, the main control board is electrically connected with the probe assembly, the antenna board is provided with a grounding coplanar waveguide structure and an antenna circuit, and the antenna circuit is electrically connected with the main control board. The grounding coplanar waveguide structure is electrically connected with the antenna circuit and the main control board, and the antenna circuit is located in the ceramic cap. The temperature measuring probe is novel in structure, and compared with a metal stamping antenna, the plate type antenna is adopted as the Bluetooth antenna, so that the fixed connection mode of the antenna is simplified, the assembling and manufacturing cost of the temperature measuring probe is reduced, and the temperature measuring probe has higher market competitiveness.

Description

Technical Field

[0001] The utility model relates to the technical field of temperature measuring devices, in particular to a temperature measuring probe with a wireless data transmission function. Background Art

[0002] The temperature probe is a common temperature measuring device. Its working principle is to use the characteristics of heat conduction and temperature sensitive elements to measure the temperature of an object. The probe of the temperature probe is usually made of heat-conducting materials, such as metal or ceramic. It can effectively contact the object to be measured to conduct heat. When the temperature probe contacts the object, due to the effect of heat conduction, the heat of the object will be quickly transferred to the probe. The probe is equipped with a temperature sensitive element. When a thermistor is used as a temperature sensitive element, the increase in the probe temperature will cause the resistance value of the thermistor to change. By measuring the change in resistance value, the temperature of the object can be accurately measured.

[0003] With the continuous development of artificial intelligence, Internet of Things and big data technology, intelligent products have become a new trend in product design. The built-in Bluetooth antenna in the temperature probe allows users to obtain the data detected by the temperature probe at a long distance on terminal devices such as mobile phones, which can effectively improve the ease of use of the temperature probe and the user experience.

[0004] In the prior art, metal stamping antennas are generally used as built-in Bluetooth antennas in temperature measuring probes. However, metal stamping antennas have defects such as complex fixed connection methods and high costs. Utility Model Content

[0005] The technical problem solved by the utility model is to provide a novel temperature measuring probe with simple structure and low cost.

[0006] In order to solve the above technical problems, the technical solution adopted by the utility model is: a temperature measuring probe, including a pipe fitting, a probe assembly is provided at one end of the pipe fitting, a ceramic cap is provided at the other end of the pipe fitting, a main control board and an antenna board are provided in the pipe fitting, the main control board is electrically connected to the probe assembly, a grounded coplanar waveguide structure and an antenna line are provided on the antenna board, the grounded coplanar waveguide structure is electrically connected to the antenna line and the main control board respectively, and the antenna line is located in the ceramic cap.

[0007] In one embodiment, the main control board and the antenna board share a dielectric substrate.

[0008] In one embodiment, the antenna circuit includes a return branch and an extension branch that are electrically connected, and the return branch and the extension branch are respectively located on two sides of the antenna board.

[0009] In one embodiment, the extending branch is L-shaped as a whole.

[0010] In one embodiment, the return branch and the extension branch are electrically connected via a first metallized hole provided on the antenna board.

[0011] In one embodiment, the grounded coplanar waveguide structure includes a bottom stratum, a feeder line and two surface strata arranged at intervals, the feeder line and the two surface strata are located on the same side of the antenna board, the feeder line is located between the two surface strata and does not contact the surface strata, the feeder line is connected to the loop branch, the bottom stratum is located on the other side of the antenna board, and the surface stratum is electrically connected to the bottom stratum through a second metallized hole.

[0012] In one embodiment, the distance between the feeder and the surface stratum is greater than or equal to 0.25 mm.

[0013] In one embodiment, each of the surface strata is connected to the bottom strata via a plurality of the second metallized holes arranged in a row, and a distance between two adjacent second metallized holes on the surface strata is less than or equal to 1 mm.

[0014] In one embodiment, the ceramic cap is made of a heat-insulating ceramic material.

[0015] In one embodiment, an end of the grounded coplanar waveguide structure away from the main control board is flush with an end of the pipe away from the probe assembly.

[0016] The beneficial effects of the utility model are:

[0017] The temperature measuring probe has a novel structure. Compared with the metal stamping antenna, the plate antenna is used as the Bluetooth antenna, which is conducive to simplifying the fixed connection method of the antenna, thereby reducing the assembly and manufacturing cost of the temperature measuring probe and having stronger market competitiveness.

[0018] Moreover, the antenna structure in the temperature measuring probe can also be designed as an integrated unit with the main control board (ie, using the same dielectric substrate as the main control board), which is conducive to further simplifying the structure of the temperature measuring probe, thereby reducing its production cost to a greater extent. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0020] Figure 1 This is a schematic diagram of the overall structure of the temperature measuring probe of the first embodiment;

[0021] Figure 2 The structure of the antenna board and the main control board in the temperature measuring probe of the first embodiment is shown in FIG. Figure 1 ;

[0022] Figure 3 The structure of the antenna board and the main control board in the temperature measuring probe of the first embodiment is shown in FIG. Figure 2 ;

[0023] Figure 4 is a graph of the S11 of the antenna in the temperature measuring probe of the first embodiment;

[0024] Figure 5 This is a graph showing how the efficiency of the antenna in the temperature measuring probe of the first embodiment varies with frequency.

[0025] Description of Figure Numbers:

[0026] 1. Pipe fittings;

[0027] 2. Probe assembly;

[0028] 3. Ceramic cap;

[0029] 4. Main control board;

[0030] 5. Antenna board;

[0031] 6. Grounded coplanar waveguide structure; 61. Bottom stratum; 62. Feeder; 63. Surface stratum; 64. Second metallized hole;

[0032] 7. Antenna line; 71. Circular branch; 72. Extended branch. DETAILED DESCRIPTION

[0033] The purpose, features and advantages of the present invention will be further described in conjunction with the embodiments and with reference to the accompanying drawings.

[0034] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0035] It should be noted that if the embodiments of the present invention involve directional indications such as up, down, left, right, front, back, etc., then the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture as shown in the accompanying drawings. If the specific posture changes, the directional indication will also change accordingly.

[0036] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features.

[0037] In addition, if the meaning of "and / or" appears in the full text is to include three parallel solutions, taking "and / or" as an example, it includes solutions, or solutions, or solutions that are satisfied at the same time. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by this utility model.

[0038] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0039] Embodiment 1

[0040] Please refer to Figures 1 to 5 , Embodiment 1 of the present utility model is: Figures 1 to 3 As shown, the temperature measuring probe includes a pipe 1, one end of the pipe 1 is provided with a probe assembly 2, the probe assembly 2 includes a thermal conductive probe and a temperature sensitive element arranged inside the thermal conductive probe, and the temperature sensitive element can be a thermistor or the like; the other end of the pipe 1 is provided with a ceramic cap 3, a main control board 4 and an antenna board 5 are arranged inside the pipe 1, the main control board 4 is electrically connected to the probe assembly 2, specifically, the main control board 4 is electrically connected to the temperature sensitive element, a grounded coplanar waveguide structure 6 and an antenna line 7 are provided on the antenna board 5, the grounded coplanar waveguide structure 6 is electrically connected to the antenna line 7 and the main control board 4, respectively, and the antenna line 7 is located inside the ceramic cap 3.

[0041] In order to facilitate processing and manufacturing and reduce the manufacturing cost of the temperature measuring probe, preferably, the main control board 4 and the antenna board 5 share a dielectric substrate, so that the antenna board 5 and the main control board 4 do not need additional physical connection. In this embodiment, the main control board 4 is an FR4 board with a dielectric constant of 4.3 and a size of 30mm×5mm×0.6mm. Of course, in actual products, the main control board 4 and the antenna board 5 can be two independent PCB boards. In this case, the two PCB boards are electrically connected through metal parts, cables or welding.

[0042] In order to ensure the miniaturization of the antenna and enable it to effectively adapt to the installation environment of the temperature measuring probe, in this embodiment, the antenna circuit 7 includes an electrically connected return branch 71 and an extended branch 72, and the return branch 71 and the extended branch 72 are respectively located on both sides of the antenna board 5, and the return branch 71 and the extended branch 72 are electrically connected through the first metallized hole provided on the antenna board 5. Optionally, the extended branch 72 is L-shaped as a whole. It is easy to understand that in a specific product, the extended branch 72 can also be of other shapes, which can be adjusted according to the working frequency band of the antenna. The antenna circuit 7 in this embodiment uses serpentine routing (i.e., the return branch 71) and the back routing of the antenna board 5 (i.e., the extended branch 72) to enable the antenna to generate 2.4G resonance in a space of 10mm*4.5mm*0.6mm. If the product structure changes, the frequency can be readjusted by modifying the size of the return branch 71 and the extended branch 72.

[0043] The grounded coplanar waveguide structure 6 includes a bottom stratum 61, a feeder line 62 and two spaced-apart surface strata 63, the feeder line 62 and the two surface strata 63 are located on the same side of the antenna board 5, the feeder line 62 is located between the two surface strata 63 and does not contact the surface strata 63, the feeder line 62 is connected to the loop branch 71, the bottom stratum 61 is located on the other side of the antenna board 5, and the surface stratum 63 is electrically connected to the bottom stratum 61 through a second metallized hole 64.

[0044] The distance between the feeder line 62 and the surface stratum 63 is greater than or equal to 0.25 mm. In this embodiment, the distance between the feeder line 62 and the surface stratum 63 is 0.25 mm.

[0045] Each of the surface strata 63 is connected to the bottom strata 61 through a plurality of the second metallized holes 64 arranged in a row, and the spacing between two adjacent second metallized holes 64 on the surface strata 63 is less than or equal to 1 mm. In this embodiment, the diameter of the second metallized hole 64 is 0.4 mm, and the spacing between two adjacent second metallized holes 64 is 0.6 mm.

[0046] The ceramic cap 3 is made of insulating ceramic material, and the pipe fitting 1 is made of metal material. In this embodiment, the pipe fitting 1 is a stainless steel pipe. The stainless steel material is not only heat-resistant, high-temperature-resistant, and corrosion-resistant, but also recyclable and has good environmental protection. Waste stainless steel can be recycled and reused, which is conducive to reducing resource waste and environmental pollution and conforms to the concept of sustainable development. The size of the stainless steel is 78mm×φ6mm.

[0047] The end of the grounded coplanar waveguide structure 6 away from the main control board 4 is flush with the end of the pipe 1 away from the probe assembly 2, that is, the antenna line 7 extends relative to the pipe 1 and is located in the ceramic cap 3. This can reduce the influence of the metal pipe 1 on the antenna performance while ensuring the miniaturization of the temperature measuring probe.

[0048] The antenna system of the temperature measuring probe has the advantage of achieving good antenna standing wave performance without using a matching circuit, and is simple to manufacture and low in cost.

[0049] Figure 4 The S11 curve of the antenna in the temperature measuring probe of this embodiment is shown in FIG. Figure 4 It can be seen that in the 2.4-2.484GHz frequency band, the antennas are all below the reference level of -6dB, which meets the design requirements.

[0050] Figure 5 The efficiency of the antenna in the temperature measuring probe of this embodiment varies with frequency. Figure 5 It can be seen that in the 2.4-2.484GHz frequency band, the antenna efficiency is above -4dB, achieving high performance.

[0051] The above are only optional embodiments of the present invention, and do not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the utility model concept, or directly / indirectly used in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A temperature measuring probe, characterized in that: It includes a pipe fitting, one end of which is provided with a probe assembly, the other end of which is provided with a ceramic cap, a main control board and an antenna board are provided inside the pipe fitting, the main control board is electrically connected to the probe assembly, a grounded coplanar waveguide structure and an antenna line are provided on the antenna board, the grounded coplanar waveguide structure is electrically connected to the antenna line and the main control board respectively, and the antenna line is located inside the ceramic cap.

2. The temperature measuring probe according to claim 1, characterized in that: The main control board and the antenna board share a dielectric substrate.

3. The temperature measuring probe according to claim 1, characterized in that: The antenna circuit includes a return-shaped branch and an extension branch which are electrically connected, and the return-shaped branch and the extension branch are respectively located on two sides of the antenna board.

4. The temperature measuring probe according to claim 3, characterized in that: The extended branches are L-shaped as a whole.

5. The temperature measuring probe according to claim 3, characterized in that: The return branch and the extension branch are electrically connected via a first metallized hole provided on the antenna board.

6. The temperature measuring probe according to claim 3, characterized in that: The grounded coplanar waveguide structure includes a bottom stratum, a feeder and two spaced-apart surface strata, the feeder and the two surface strata are located on the same side of the antenna board, the feeder is located between the two surface strata and does not contact the surface strata, the feeder is connected to the loop branch, the bottom stratum is located on the other side of the antenna board, and the surface stratum is electrically connected to the bottom stratum through a second metallized hole.

7. The temperature measuring probe according to claim 6, characterized in that: The distance between the feeder and the surface stratum is greater than or equal to 0.25 mm.

8. The temperature measuring probe according to claim 6, characterized in that: Each of the surface strata is connected to the bottom strata via a plurality of the second metallized holes arranged in a row, and a distance between two adjacent second metallized holes on the surface strata is less than or equal to 1 mm.

9. The temperature measuring probe according to claim 1, characterized in that: The ceramic cap is made of heat-insulating ceramic material.

10. The temperature measuring probe according to claim 1, characterized in that: An end of the grounded coplanar waveguide structure away from the main control board is flush with an end of the pipe away from the probe assembly.

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