Heat flow sensor supporting in-situ replacement of thermosensitive element

Abstract

The utility model relates to the technical field of heat flow sensors, in particular to a heat flow sensor supporting in-situ replacement of a thermosensitive element, which comprises a shell with an opening at the bottom end, a mounting seat arranged in the shell, and the thermosensitive element arranged at the upper end of the mounting seat, the electrode holes are formed in the mounting base and located in the two ends of the thermosensitive element respectively, the contact electrodes are arranged in the electrode holes respectively, the first electrode plate is arranged on the inner wall of the upper end of the shell, the lower vertical groove, the middle ring groove and the upper vertical groove are formed in the peripheral face of the mounting base, and the positioning sliding block is arranged on the inner wall of one side of the shell. According to the utility model, the test and use convenience of the sensor is greatly improved, and the thermosensitive element can be replaced in situ, so that the use cost is effectively reduced, and the use convenience is remarkably improved.

Description

Technical Field

[0001] This utility model relates to the field of heat flow sensor technology, specifically to a heat flow sensor that supports in-situ replacement of thermistor elements. Background Technology

[0002] In aerospace, military explosives, and high-end automotive fields, high-temperature components (such as turbine blades, guide vanes, and turbine disks of aero-engines) are constantly under high-speed rotation and exposed to high-temperature airflow, enduring severe thermal shock and cyclic thermal loading. Under these conditions, materials are highly susceptible to thermal fatigue, oxidation ablation, and microcracks, seriously threatening the structural integrity and service safety of equipment. Therefore, high-precision, high-response-speed in-situ measurement of the surface temperature field and heat flux density of high-temperature components is not only a key basis for evaluating their thermal protection performance and life prediction, but also an important foundation for optimizing cooling design and verifying numerical simulation models.

[0003] Thin-film heat flux sensors are characterized by their small size, fast response speed, and ease of integration, offering significant advantages for real-time, continuous, and in-situ measurement of high-temperature parameters. Traditional thermopile-type thin-film heat flux sensors, however, still have certain shortcomings in terms of ease of use and maintainability. For example, when a sensor malfunctions, it must be replaced before it can be used again. This is very inconvenient in emergency situations or when no spare sensor is available. Furthermore, finished sensors cannot have their thermistor replaced and tested individually, leading to high maintenance and operating costs. Utility Model Content

[0004] To address the aforementioned problems, this invention provides a heat flow sensor that supports in-situ replacement of thermistor elements, significantly improving the convenience of sensor testing and use. Furthermore, the thermistor elements can be replaced in situ, effectively reducing usage costs.

[0005] The technical solution adopted by this utility model is to provide a heat flow sensor that supports in-situ replacement of thermistor elements, including a shell with an opening at the bottom, a mounting base disposed in the shell, a thermistor element disposed at the upper end of the mounting base, and electrode holes disposed on the mounting base and located at both ends of the thermistor element, contact electrodes disposed in the electrode holes, a first electrode plate disposed on the inner wall of the upper end of the shell, a lower vertical groove, a middle ring groove and an upper vertical groove disposed on the outer peripheral surface of the mounting base, and a positioning slider disposed on the inner wall of one side of the shell.

[0006] The contact electrodes are located at intervals at both ends of the thermistor. There are two first electrode plates, with the two ends of one first electrode plate corresponding to the contact electrode at one end of the thermistor and on the same side, and the two ends of the other first electrode plate corresponding to the contact electrode at the other end of the thermistor and on the other side.

[0007] The positioning slider is compatible with the lower vertical groove, the middle ring groove and the upper vertical groove. The lower vertical groove is closed at the lower end and connected to the middle ring groove at the upper end. The upper vertical groove is open at the upper end and connected to the middle ring groove at the lower end. Multiple thermal elements are arranged in a ring array at the upper end of the mounting base. The number of lower vertical grooves and thermal elements are the same and correspond one-to-one.

[0008] A second electrode is provided at the position corresponding to the thermistor element on the first electrode sheet, and a clamping spring is provided between the first electrode sheet and the second electrode sheet. The two second electrode sheets are respectively corresponding to one end of the thermistor element.

[0009] The upper end of the outer casing is provided with a test port located between the first electrode plates.

[0010] The inner end of the thermal element faces the center point of the upper end of the mounting base, and the outer end faces outward from the mounting base.

[0011] The mounting base has a built-in cable collection cavity and a cable outlet hole communicating with the cable collection cavity at the lower end of the mounting base. The lower end of the electrode hole is also communicating with the cable collection cavity.

[0012] The mounting base is provided with a cable outlet tube corresponding to the cable outlet hole at its lower end.

[0013] The mounting base has a heat exchange chamber inside, and the lower end of the mounting base is provided with an outlet pipe and an inlet pipe that communicate with the heat exchange chamber.

[0014] The mounting base has a placement groove at its upper end that is compatible with the thermal element.

[0015] It also includes a screw hole at the center of the upper end of the mounting base, a fixing hole at the center of the upper end of the housing, a fixing bolt that is screwed into the fixing hole and screwed into the screw hole, and a flange that is set at the lower end of the housing and fitted and fixed on the mounting base, wherein the lower end of the housing abuts against the flange.

[0016] The mounting base is a heat sink base, and an insulating layer is provided between the contact electrode and the electrode hole.

[0017] The beneficial effects of this utility model are:

[0018] 1. This utility model uses a first electrode plate and a second electrode plate on the outer shell to connect the cold end electrode and hot end electrode of the thermistor on the mounting base to two contact electrodes, allowing the thermistor to output signals through the contact electrodes. This utility model arranges multiple sets of thermistors and contact electrodes in an array on the upper end of the mounting base. When a current thermistor is unusable, the outer shell can be rotated to connect the first and second electrode plates to another set of thermistors and contact electrodes for continued use, achieving in-situ replacement without disassembling and replacing the entire sensor, effectively reducing operating costs and significantly improving ease of use. Furthermore, with the test port on the outer shell, targeted testing of the thermistors can be performed. Rotating the outer shell allows for individual testing of all thermistors, making testing more targeted and operation more convenient.

[0019] 2. This utility model has a lower vertical groove, a middle ring groove and an upper vertical groove designed on the outer periphery of the mounting base. These grooves work together with the positioning slide groove on the inner wall of the housing to accurately position and limit the rotation of the housing. This ensures that the first electrode plate and the second electrode plate on the housing can accurately connect a set of thermal elements and contact electrodes, further improving the ease of use.

[0020] 3. This utility model adopts a horizontal thermoelectric thin film type thermistor element, which is placed in the placement groove at the upper end of the mounting base. The placement groove contains thermally conductive silicone grease, which can fix the thermistor element. After the thermistor element fails, the outer shell can be removed and the thermistor element can be replaced and it can continue to be used, effectively reducing the cost of use.

[0021] 4. This utility model has a heat exchange chamber designed in the mounting base, through which coolant can be discharged and filled in through the liquid outlet pipe and the liquid inlet pipe, further improving the heat dissipation performance of the sensor.

[0022] 5. This utility model has a flange fixedly fitted on the outer periphery of the bottom of the mounting base, and the lower end of the outer shell is pressed against the flange. This not only facilitates the installation and use of the sensor, but also allows for further positioning and limiting of the outer shell. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of this utility model;

[0024] Figure 2 This is a bottom view of the present invention;

[0025] Figure 3 This is a schematic diagram of the mounting base in this utility model;

[0026] Figure 4 This is a cross-sectional view of the present invention;

[0027] Figure 5 yes Figure 4 Enlarged view of A in the middle;

[0028] Figure 6 yes Figure 4 Enlarged view of B in the middle;

[0029] Figure 7 This is a schematic diagram of the contact electrode structure in this utility model.

[0030] In the attached diagram, 1 is the outer casing, 2 is the mounting base, 3 is the thermal element, 4 is the contact electrode, 5 is the first electrode plate, 6 is the lower vertical groove, 7 is the middle ring groove, 8 is the upper vertical groove, 9 is the positioning slider, 10 is the second electrode plate, 11 is the clamping spring, 12 is the test port, 13 is the cable collection cavity, 14 is the cable outlet pipe, 15 is the heat exchange cavity, 16 is the liquid outlet pipe, 17 is the liquid inlet pipe, 18 is the screw hole, 19 is the fixing hole, and 20 is the flange. Detailed Implementation

[0031] like Figure 1-7 As shown, this utility model provides a heat flow sensor that supports in-situ replacement of thermistor element 3, including a housing 1 with an open bottom, a mounting base 2 disposed inside the housing 1, a thermistor element 3 disposed on the upper end of the mounting base 2, and electrode holes disposed on the mounting base 2 and located at both ends of the thermistor element 3, contact electrodes 4 disposed in the electrode holes, a first electrode plate 5 disposed on the inner wall of the upper end of the housing 1, a lower vertical groove 6, a middle ring groove 7 and an upper vertical groove 8 disposed on the outer peripheral surface of the mounting base 2, and a positioning slider 9 disposed on one side of the inner wall of the housing 1; the contact electrodes 4 are respectively spaced at both ends of the thermistor element 3. Two first electrode plates 5 are provided, and the two ends of one first electrode plate 5 correspond to one end of the thermistor 3 and the contact electrode 4 on the same side, respectively. The two ends of the other first electrode plate 5 correspond to the other end of the thermistor 3 and the contact electrode 4 on the other side, respectively. The positioning slider 9 is adapted to the lower vertical groove 6, the middle ring groove 7 and the upper vertical groove 8. The lower vertical groove 6 is closed at the lower end and connected to the middle ring groove 7 at the upper end. The upper vertical groove 8 is open at the upper end and connected to the middle ring groove 7 at the lower end. Multiple thermistors 3 are arranged in a ring array on the upper end of the mounting base 2. The number of lower vertical grooves 6 is the same as that of thermistors 3 and they correspond one-to-one.

[0032] The outer casing 1 is a cylindrical structure with an open bottom and a closed top. The mounting base 2 is a cylindrical structure. The thermal element 3 is a transverse thermoelectric thin film thermal element, which is mounted on the upper end of the mounting base 2.

[0033] Contact electrodes 4 are installed in the electrode holes at both ends of the thermistor element 3. The contact electrodes 4 are elastic contact electrodes with springs. The structure of the contact electrodes 4 is an existing structure, as shown in the appendix. Figure 7 .

[0034] Two first electrode pieces 5 are fixed to the upper inner wall of the housing 1, and one of the first electrode pieces 5 corresponds to one end of the thermistor 3 and the position of the adjacent contact electrode 4, while the other first electrode piece 5 corresponds to the other end of the thermistor 3 and the position of the other contact electrode 4. After the housing 1 is fastened to the mounting base 2, the first electrode piece 5 is attached to the electrode terminals of the thermistor 3 and the contact electrode 4, connecting the two electrode terminals of the thermistor 3 to the two contact electrodes 4 respectively, thereby realizing signal output.

[0035] The lower vertical groove 6, the middle ring groove 7, and the upper vertical groove 8 on the mounting base 2 are adapted to the positioning slider 9 on the inner wall of the outer casing 1, and the positioning slider 9 can slide within the lower vertical groove 6, the middle ring groove 7, and the upper vertical groove 8.

[0036] Multiple arrays of thermistor 3 and its two end contact electrodes 4 are arranged. The number and position of the lower vertical grooves 6 are consistent with each thermistor 3, that is, one lower vertical groove 6 corresponds to one thermistor 3. When the current thermistor 3 fails and cannot be used, the operator can pull up the outer shell 1. The positioning slider 9 on the inner wall of the outer shell 1 slides from the lower vertical groove 6 into the middle ring groove 7. The two first motor plates 5 are disengaged from the thermistor 3. Then, the outer shell 1 is rotated, and the positioning slider 9 slides in a ring in the middle ring groove 7. After it corresponds to the position of another lower vertical groove 6, the outer shell 1 is pushed down, and the positioning slider 9 slides into the lower vertical groove 6. That is, the two first electrode plates 5 are attached to another set of thermistor 3, realizing the in-situ replacement of the thermistor 3. The sensor can continue to be used without replacing the entire sensor. When it is necessary to disassemble the thermistor 3, simply pull up the outer shell 1. The positioning slider 9 slides out from the lower vertical groove 6, the middle ring groove 7 and the upper vertical groove 8 in sequence. The outer shell 1 can then be removed, and a new thermistor 3 can be removed and replaced. It should be noted that if there are two symmetrical positioning sliders 9 as shown in the attached figure, the number of thermal elements 3 needs to be even, such as 4, 6 or 8 sets, in order for the positioning sliders 9 and thermal elements 3 to be compatible.

[0037] like Figure 4-5 As shown, a second electrode 10 is provided at the position corresponding to the first electrode 5 and the thermistor 3, and a clamping spring 11 is provided between the first electrode 5 and the second electrode 10. The two second electrode 10 are respectively corresponding to one end of the thermistor 3.

[0038] The contact electrode 4 can be pressed against the first electrode plate 5 by its own elasticity. In order to ensure that the first electrode plate 5 and the electrode of the thermistor 3 can be pressed against each other and improve stability, this design adds a pressing spring 11 and a second electrode plate 10 at the corresponding positions of the first electrode plate 5 and the thermistor 3. The pressing spring 11 presses the second electrode plate 10 against the electrode of the thermistor 3 to ensure the stability of the connection.

[0039] like Figure 1 and4 As shown, the upper end of the outer shell 1 is provided with a test port 12 and is located between the first electrode plates 5.

[0040] The test port 12 is positioned corresponding to the thermal element 3. The currently operating thermal element 3 can be exposed without removing the outer casing 1, and the thermal element 3 can be tested using the corresponding testing device.

[0041] like Figure 3 As shown, the inner end of the thermal element 3 faces the center point of the upper end of the mounting base 2, and the outer end faces outward from the mounting base 2.

[0042] This design limits the installation position and orientation of the thermal element 3, allowing for a larger array size, a more reasonable layout, and easier production and installation.

[0043] like Figure 4 and Figure 6 As shown, the mounting base 2 has a built-in cable collection cavity 13 and the lower end of the mounting base 2 is provided with a cable outlet hole communicating with the cable collection cavity 13. The lower end of the electrode hole is connected to the cable collection cavity 13.

[0044] The hub cavity 13 is a cavity located inside the lower end of the mounting base. The electrode holes on the mounting base 2 are vertically connected, and the lower ends of all electrode holes are connected to the hub cavity 13. The contact electrode 4 is installed on the upper part of the electrode hole, and the contact end protrudes upward. The lower end of the contact electrode 4 is connected to a signal line. The signal line passes through the electrode hole into the hub cavity 13 and extends outward from the outlet hole to form a signal output line.

[0045] like Figure 2 As shown, the lower end of the mounting base 2 is provided with a cable outlet pipe 14 corresponding to the cable outlet hole.

[0046] This design adds a cable outlet tube 14 at the cable outlet hole, which can protect and guide the signal output line.

[0047] like Figure 4 As shown, the mounting base 2 is provided with a heat exchange chamber 15 inside, and the lower end of the mounting base 2 is provided with an outlet pipe 16 and an inlet pipe 17 that communicate with the heat exchange chamber 15.

[0048] The heat exchange chamber 15 is an inner cavity located in the middle of the mounting base 2 and is not connected to the electrode hole and the junction box 13. The heat exchange chamber 15 is filled with coolant for cooling, which further improves the heat dissipation performance of the sensor. The coolant can also be easily replaced through the outlet pipe 16 and the inlet pipe 17.

[0049] like Figure 3 As shown, the upper end of the mounting base 2 is provided with a placement groove that is compatible with the thermal element 3.

[0050] The placement slot is used to place the thermal element 3 and position the thermal element 3. The thermal element 3 is fixed by filling the placement slot with thermally conductive silicone grease.

[0051] like Figure 1-4 As shown, it also includes a screw hole 18 located at the center of the upper end of the mounting base 2, a fixing hole 19 located at the center of the upper end of the outer shell 1, a fixing bolt located in the fixing hole 19 and screwed into the screw hole 18, and a flange 20 located at the lower end of the outer shell 1 and fitted and fixed on the mounting base 2, wherein the lower end of the outer shell 1 abuts against the flange 20.

[0052] The housing 1 and the mounting base 2 are further secured by fixing bolts, screw holes 18 and fixing holes 19. The flange 20 is fitted and fixed on the outer periphery of the lower end of the mounting base 2. The flange 20 can facilitate the fixing of the sensor and can also be used to further position the housing 1.

[0053] like Figure 3-4 As shown, the mounting base 2 is a heat sink base, and an insulating layer is provided between the contact electrode 4 and the electrode hole.

[0054] The heat sink is made of metal and has good thermal conductivity, which can further improve the heat dissipation of the sensor. The insulating layer is placed between the contact electrode 4 and the metal heat sink to provide insulation.

Claims

1. A heat flow sensor supporting in-situ replacement of thermistor elements, comprising a housing (1) with an opening at the bottom, a mounting base (2) disposed within the housing (1), and a thermistor element (3) disposed at the upper end of the mounting base (2), characterized in that: It also includes electrode holes disposed on the mounting base (2) and located at both ends of the thermal element (3), contact electrodes (4) disposed in the electrode holes, a first electrode plate (5) disposed on the inner wall of the upper end of the housing (1), a lower vertical groove (6), a middle ring groove (7) and an upper vertical groove (8) disposed on the outer peripheral surface of the mounting base (2), and a positioning slider (9) disposed on the inner wall of one side of the housing (1). The contact electrodes (4) are respectively located at the two ends of the thermistor (3). There are two first electrode plates (5), and the two ends of one first electrode plate (5) correspond to one end of the thermistor (3) and the contact electrode (4) on the same side, respectively. The two ends of the other first electrode plate (5) correspond to the other end of the thermistor (3) and the contact electrode (4) on the other side, respectively. The positioning slider (9) is compatible with the lower vertical groove (6), the middle ring groove (7) and the upper vertical groove (8). The lower vertical groove (6) is closed at the lower end and connected to the middle ring groove (7) at the upper end. The upper vertical groove (8) is open at the upper end and connected to the middle ring groove (7) at the lower end. Multiple thermal elements (3) are arranged in a ring array at the upper end of the mounting base (2). The number of lower vertical grooves (6) and thermal elements (3) are the same and correspond one-to-one.

2. A heat flow sensor supporting in-situ replacement of thermistor elements according to claim 1, characterized in that: The first electrode plate (5) is provided with a second electrode plate (10) at the position corresponding to the thermistor (3), and a clamping spring (11) is provided between the first electrode plate (5) and the second electrode plate (10). The two second electrode plates (10) are respectively corresponding to one end of the thermistor (3).

3. A heat flow sensor supporting in-situ replacement of thermistor elements according to claim 2, characterized in that: The outer shell (1) has a test port (12) at its upper end, located between the first electrode plates (5).

4. A heat flow sensor supporting in-situ replacement of thermistor elements according to claim 1, characterized in that: The inner end of the thermal element (3) faces the center point of the upper end of the mounting base (2), and the outer end faces the outside of the mounting base (2).

5. A heat flow sensor supporting in-situ replacement of thermistor elements according to claim 1, characterized in that: The mounting base (2) has a built-in cable collection cavity (13) and the lower end of the mounting base (2) is provided with a cable outlet hole that communicates with the cable collection cavity (13). The lower end of the electrode hole communicates with the cable collection cavity (13).

6. A heat flow sensor supporting in-situ replacement of thermistor elements according to claim 5, characterized in that: The mounting base (2) is provided with a cable outlet pipe (14) corresponding to the cable outlet hole at its lower end.

7. A heat flow sensor supporting in-situ replacement of thermistor elements according to claim 1, characterized in that: The mounting base (2) is provided with a heat exchange chamber (15) inside, and the lower end of the mounting base (2) is provided with an outlet pipe (16) and an inlet pipe (17) that communicate with the heat exchange chamber (15).

8. A heat flow sensor supporting in-situ replacement of thermistor elements according to claim 7, characterized in that: The mounting base (2) is provided with a placement groove at its upper end that is compatible with the thermal element (3).

9. A heat flow sensor supporting in-situ replacement of thermistor elements according to claim 1, characterized in that: It also includes a screw hole (18) at the center of the upper end of the mounting base (2), a fixing hole (19) at the center of the upper end of the outer shell (1), a fixing bolt that is set in the fixing hole (19) and screwed into the screw hole (18), and a flange (20) that is set at the lower end of the outer shell (1) and fitted and fixed on the mounting base (2), wherein the lower end of the outer shell (1) abuts against the flange (20).

10. A heat flow sensor supporting in-situ replacement of thermistor elements according to claim 1, characterized in that: The mounting base (2) is a heat sink base, and an insulating layer is provided between the contact electrode (4) and the electrode hole.

Images