Heat conductivity coefficient tester

Abstract

The utility model provides a heat conductivity coefficient tester and belongs to the technical field of heat conductivity coefficient testers. Comprising a detection part which comprises a base and a storage tray fixed to the top of the base through a supporting rod, and a detection plate is arranged in the center of the top of the base; the side edge seat is fixedly connected to the outer side wall of the base; the heating part comprises a movable seat and a sliding seat arranged on the side edge of the movable seat; the handle is fixedly connected to the outer side wall of the movable seat, and a limiting assembly is arranged on the inner side wall of the handle. The to-be-measured piece is placed between the heating plate and the measuring plate, the heating plate is started to generate heat, the heat is transferred to the detection plate from the to-be-measured piece, the heat conductivity coefficient is measured according to the temperature change of the detection plate and the thickness of the to-be-measured piece in unit time, and the device is simple, small and exquisite in structure and convenient to operate. The energy consumption required by measurement is only that the heating plate is connected with an external power supply, the power consumption is low, and the classroom teaching experiment application can be met.

Description

Technical Field

[0001] The utility model relates to the technical field of thermal conductivity measuring instruments, in particular to a thermal conductivity measuring instrument. Background Art

[0002] Thermal conductivity meter is an instrument used to measure the thermal conductivity of different materials. Thermal conductivity (or thermal resistance) is one of the main thermal properties of insulation materials and is the main indicator of the quality of thermal insulation performance of materials. In recent years, with the introduction of building energy-saving regulations, my country has attached more and more importance to building energy-saving. Therefore, it is very necessary to accurately measure this parameter. It is of great significance for the rational selection of materials.

[0003] The existing thermal conductivity tester includes a box body, inside which are arranged a normal temperature chamber, a hot chamber and a test frame. The normal temperature chamber and the hot chamber are respectively located on both sides of the test frame. The temperature insulation between the normal temperature chamber and the hot chamber is achieved by the material plate to be tested. Finally, the change of the temperature of the normal temperature chamber per unit time is measured to determine the thermal conductivity of the tested object.

[0004] However, the existing measuring equipment is large in size and consumes a lot of energy during measurement, which makes it difficult to cope with the teaching in classroom experiments. Therefore, this application provides a thermal conductivity coefficient measuring instrument to meet the needs of classroom teaching. Utility Model Content

[0005] The technical problem to be solved by the utility model is to provide a thermal conductivity measuring instrument to solve the problem that the existing measuring equipment is large in size, consumes a lot of energy during measurement, and is difficult to cope with the teaching in classroom experiments.

[0006] In order to solve the above technical problems, the utility model provides the following technical solutions:

[0007] A thermal conductivity measuring instrument, comprising:

[0008] The detection part includes a base, and a storage tray fixed on the top of the base by a support rod, wherein a through hole is provided in the middle of the storage tray, and a detection plate is provided at the center of the top of the base, wherein the detection plate is located inside the through hole in the middle of the storage tray and has no contact with each other, and the top of the detection plate is in the same horizontal plane as the top of the storage tray;

[0009] A side seat is fixedly connected to the outer side wall of the base, two parallel columns are vertically arranged on the top of the side seat, and a connecting block is fixedly connected to the upper position between the two columns;

[0010] The heating part comprises a movable seat and a sliding seat arranged on the side of the movable seat, the sliding seat is slidably connected with the column, and a heating plate is horizontally arranged at the bottom of the movable seat;

[0011] The handle is fixedly connected to the outer wall of the movable seat and is sleeved on the outer side of the sliding seat. A limiting component is provided on the inner wall of the handle. The limiting component is configured to position the heating part near the top of the column by overlapping with the connecting block.

[0012] Preferably, there are no less than two of the side seats, sliding seats and handles.

[0013] Preferably, a slide groove is provided on the sliding seat, and the slide groove is a waist-shaped structure, and is slidably connected with the two columns located on the same side seat.

[0014] Preferably, a plug hole is provided on the side wall of the slide groove away from the movable seat, and a positioning hole is opened on the side wall of the slide groove opposite to the plug hole. The plug hole and the positioning hole have the same radial cross-section and are distributed in a straight line.

[0015] Preferably, the limiting assembly includes a sliding rod vertically fixedly connected to the inner wall of the handle, and a limiting cylinder slidably connected to the sliding rod.

[0016] Preferably, the cross-sectional shape of the outer wall of the sliding rod is the same as the radial cross-sectional shape of the insertion hole and the positioning hole, and the limiting cylinder is configured so that when it is away from the handle, one end passes through the insertion hole and cooperates with the positioning hole for socket connection, and when it is close to the handle, the end of the limiting cylinder away from the handle does not completely detach from the inside of the insertion hole.

[0017] Preferably, one end of the sliding rod away from the handle is located inside the insertion hole.

[0018] Preferably, the width of both sides of the connecting block is smaller than the thickness of the wall of the slide slot.

[0019] Compared with the prior art, the utility model has at least the following beneficial effects:

[0020] In the above scheme, the piece to be tested is placed between the heating plate and the measuring plate, the heating plate is started to generate heat, and the heat is transferred from the piece to be tested to the testing plate. The thermal conductivity is measured by the temperature change of the testing plate and the thickness of the piece to be tested in unit time. The device is simple and compact in structure, and the energy consumption required for the measurement is only the connection of the heating plate to an external power supply. The power consumption is low and can meet the needs of classroom teaching experiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings, which are incorporated herein and constitute a part of the specification, illustrate embodiments of the present disclosure and, together with the description, further serve to explain the principles of the present disclosure and to enable those skilled in the relevant art to make and use the present disclosure.

[0022] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0023] Figure 2 This is a schematic diagram of the detection part and column connection structure of the utility model;

[0024] Figure 3 It is a schematic cross-sectional view of the heating part and the limiting component of the utility model;

[0025] Figure 4 for Figure 3 A magnified view of the structure of area A.

[0026] In the figure: 1. detection part; 11. base; 12. support rod; 13. storage tray; 14. detection plate; 2. side seat; 3. column; 4. heating part; 41. movable seat; 42. heating plate; 43. sliding seat; 44. slide groove; 45. socket; 46. positioning hole; 5. limit assembly; 51. slide rod; 52. limit cylinder; 6. handle; 7. connecting block.

[0027] As shown in the figure, in order to clearly implement the structure of the embodiment of the utility model, specific structures and devices are marked in the figure, but this is only for illustrative purposes and is not intended to limit the utility model to the specific structure, device and environment. According to specific needs, ordinary technicians in this field can adjust or modify these devices and environments, and the adjustments or modifications made are still included in the scope of the attached claims. DETAILED DESCRIPTION

[0028] The following is a detailed description of a thermal conductivity tester provided by the utility model in combination with the accompanying drawings and specific embodiments. At the same time, it is explained here that in order to make the embodiments more detailed, the following embodiments are the best and preferred embodiments. For some known technologies, those skilled in the art may also adopt other alternative methods to implement them; and the accompanying drawings are only for more specific description of the embodiments, and are not intended to specifically limit the utility model.

[0029] like Figure 1 - Figure 4 As shown, an embodiment of the utility model provides a thermal conductivity measuring instrument, including a detection part 1, including a base 11, and a placement plate 13 fixed to the top of the base 11 by a support rod 12, a through hole is provided in the middle of the placement plate 13, a detection plate 14 is provided at the center position of the top of the base 11, a temperature measuring component for measuring the temperature of the body of the detection plate 14 is provided inside the detection plate 14, the detection plate 14 is located inside the middle through hole of the placement plate 13, and there is no contact between them, and the top of the detection plate 14 and the top of the placement plate 13 are in the same horizontal plane.

[0030] By providing a storage tray 13 and a detection plate 14 to support the workpiece to be tested, and the tops of the two are at the same horizontal height, the workpiece to be tested and the top of the detection plate 14 can be tightly fitted together, ensuring that the contact area between the detection plate 14 and the workpiece to be tested is the same during each measurement, and the detection plate 14 and the storage tray 13 have no contact with each other, thereby avoiding temperature conduction from external heat sources and further eliminating external environmental factors of the measurement.

[0031] The side seat 2 is fixedly connected to the outer wall of the base 11. Two parallel columns 3 are vertically arranged on the top of the side seat 2 to improve the supporting effect. A connecting block 7 is fixedly connected to the upper position between the two columns 3.

[0032] The heating part 4 includes a movable seat 41 and a sliding seat 43 arranged on the side of the movable seat 41. The sliding seat 43 is slidably connected with the column 3. A heating plate 42 is horizontally arranged at the bottom of the movable seat 41. A heat dissipation component is provided on the top of the movable seat 41 for dissipating heat from the heating plate 42 to prevent it from being damaged due to excessive temperature.

[0033] By arranging the heating plate 42 in a horizontal direction, the contact area between the heating plate 42 and each test piece is the same during measurement, thereby ensuring that the control factors for each measurement are the same, thereby improving the measurement accuracy.

[0034] The handle 6 is fixedly connected to the outer wall of the movable seat 41 and is looped around the outer side of the sliding seat 43. A limit assembly 5 is provided on the inner wall of the handle 6. The limit assembly 5 is configured to overlap with the connecting block 7 so that the heating part 4 is positioned near the top of the column 3.

[0035] The cooperation between the limiting assembly 5 and the connecting block 7 can make the heating part 4 located at the high position of the column 3 away from the detection part 1 , so as to facilitate the placement of the test piece on the top of the detection plate 14 .

[0036] like Figure 1 As shown, there are no less than two side seats 2, sliding seats 43, and handles 6, wherein the number of side seats 2 is the same as that of sliding seats 43, and they are respectively distributed in a centrally symmetrical direction to ensure the support stability of the column 3 on the heating part 4, avoid the overall tilt of the heating part 4 resulting in a decrease in the horizontality of the bottom of the heating plate 42, and at the same time improve the straightness of the sliding rod of the heating part 4. Preferably, there are two handles 6 for easy operation.

[0037] Furthermore, an extension plate is provided on the inner side wall of the placement tray 13, which is gradually protruding toward the center position, and a certain gap is ensured between it and the detection plate 14, so as to support the test piece with a smaller area. A multi-section raised baffle structure is provided on one side of the edge of the placement tray 13, so as to play a certain role in limiting the test piece placed on the top of the placement tray 13 (see Figure 2 ).

[0038] like Figure 4As shown, a slide groove 44 is provided on the sliding seat 43, and the slide groove 44 has a waist-shaped structure and can be slidably connected with two columns 3 located on the same side seat 2 at the same time; a plug hole 45 is provided on the side wall of the slide groove 44 away from the movable seat 41, and a positioning hole 46 is provided on the side wall of the slide groove 44 opposite to the plug hole 45. The plug hole 45 and the positioning hole 46 have the same radial cross-section and are distributed in a straight line.

[0039] The limiting assembly 5 includes a slide bar 51 vertically fixedly connected to the inner wall of the handle 6, and a limiting cylinder 52 slidably connected with the slide bar 51; the cross-sectional shape of the outer wall of the slide bar 51 is the same as the radial cross-sectional shape of the insertion hole 45 and the positioning hole 46, and the limiting cylinder 52 is configured to pass through the insertion hole 45 and be connected with the positioning hole 46 when it is away from the handle 6. When it is close to the handle 6, the end of the limiting cylinder 52 away from the handle 6 is not completely separated from the inside of the insertion hole 45, and the end of the limiting cylinder 52 close to the handle 6 is provided with a pick (refer to Figure 4 ), when holding the handle 6, the limiting cylinder 52 can be pushed and pulled by fingers to make it slide linearly on the sliding rod 51.

[0040] Through the above arrangement, when the heating part 4 is at a high position of the column 3, the limiting cylinder 52 is slid to pass through the socket 45 and the positioning hole 46 for socket connection. As the heating part 4 falls, the bottom of the limiting cylinder 52 contacts the top of the connecting block 7. At this time, the two ends of the limiting cylinder 52 are supported by the socket 45 and the positioning hole 46 to complete the height positioning of the heating part 4, so that it is fixed at a high position of the column 3 and cannot fall, which is convenient for replacing the test piece on the top of the storage tray 13.

[0041] like Figure 4 As shown, one end of the slide rod 51 away from the handle 6 is located inside the insertion hole 45 .

[0042] This arrangement ensures that when the limiting cylinder 52 is close to the handle 6, the end of the limiting cylinder 52 located inside the insertion hole 45 is still supported by the sliding rod 51, thereby preventing the limiting cylinder 52 from failing due to bending and deformation of the end portion caused by force.

[0043] The width of both sides of the connecting block 7 is smaller than the wall thickness of the slide groove 44 , so as to avoid blocking the sliding connection between the slide groove 44 and the column 3 , thereby ensuring smooth upward and downward sliding of the heating part 4 .

[0044] The technical solution provided by the utility model is that when it is necessary to measure the thermal conductivity coefficient, the workpiece to be tested is first made into a plate structure with uniform thickness, and its thickness is measured. When the measuring instrument is in the initial state, the heating part 4 is located at the high position of the column 3, and the limiting cylinder 52 is located at the end away from the handle 6. The bottom of the cylinder inside the slide groove 44 on the limiting cylinder 52 overlaps with the top of the connecting block 7, and the workpiece to be tested is placed on the top of the storage tray 13, and it is ensured that the center position of the workpiece to be tested is located at the top of the detection plate 14 and the area of ​​the workpiece to be tested is larger than the top area of ​​the detection plate 14. Subsequently, an external power supply is connected to start the heating part 4 for preheating. The preheating needs to be greater than thirty seconds. At this time, the temperature measuring component inside the detection plate 14 in the detection part 1 measures its body temperature and records it. After the preheating is completed, the handle 6 is held and the heating part 4 is lightly lifted, and the finger is hooked on the paddle on the limiting cylinder 52 to move the limiting cylinder 52 to the side close to the handle 6. The end is toggled to make the limiting cylinder 52 disengage from the socket fit with the positioning hole 46 and completely withdraw from the slide groove 44, and then continue to hold the handle 6 to slowly lower the heating part 4 downward until the movable seat 41 at the bottom of the heating part 4 contacts the top of the workpiece to be tested and then release it. The timing starts at the moment the movable seat 41 contacts the workpiece to be tested, and the measurement time is controlled within five to ten minutes, and is specifically adjusted front and back according to the heating speed of the workpiece to be tested and the detection plate 14. After the measurement is completed, the heating part 4 is pushed upward away from the workpiece to be tested by holding the handle 6, and the high position of the heating part 4 is limited by the overlap of the limiting component 5 and the connecting block 7. At the moment the heating plate 42 leaves the workpiece to be tested, the temperature after the measurement is measured by the temperature measuring component inside the detection plate 14, and the timing is stopped. At this time, the thermal conductivity of the workpiece to be tested can be measured according to the thickness of the workpiece to be tested, the measurement time and the temperature difference before and after the measurement of the detection plate 14.

[0045] The present invention covers any substitution, modification, equivalent method and scheme made on the essence and scope of the present invention. In order to make the public have a thorough understanding of the present invention, specific details are described in detail in the above preferred embodiments of the present invention, and those skilled in the art can fully understand the present invention without the description of these details. In addition, in order to avoid unnecessary confusion about the essence of the present invention, well-known methods, processes, procedures, components and circuits are not described in detail.

[0046] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A thermal conductivity measuring instrument, characterized in that: include: The detection part (1) comprises a base (11), and a storage tray (13) fixed to the top of the base (11) by a support rod (12), wherein a through hole is provided in the middle of the storage tray (13), and a detection plate (14) is provided at the center of the top of the base (11), wherein the detection plate (14) is located inside the through hole in the middle of the storage tray (13) and has no contact with each other, and the top of the detection plate (14) and the top of the storage tray (13) are in the same horizontal plane; A side seat (2) is fixedly connected to the outer side wall of the base (11); two mutually parallel columns (3) are vertically arranged on the top of the side seat (2); a connecting block (7) is fixedly connected to the upper position between the two columns (3); The heating part (4) comprises a movable seat (41) and a sliding seat (43) arranged on the side of the movable seat (41), wherein the sliding seat (43) is slidably connected with the column (3), and a heating plate (42) is horizontally arranged at the bottom of the movable seat (41); A handle (6) is fixedly connected to the outer wall of the movable seat (41) and is sleeved on the outer side of the sliding seat (43). A limit assembly (5) is provided on the inner wall of the handle (6). The limit assembly (5) is configured to overlap with the connecting block (7) so that the heating part (4) is positioned near the top of the column (3).

2. The thermal conductivity measuring instrument according to claim 1, characterized in that: The side seats (2), sliding seats (43) and handles (6) are provided in at least two pieces.

3. The thermal conductivity measuring instrument according to claim 1, characterized in that: The sliding seat (43) is provided with a sliding groove (44), which is in a waist-shaped structure and is slidably connected with the two upright posts (3) located on the same side seat (2).

4. The thermal conductivity measuring instrument according to claim 3, characterized in that: A plug hole (45) is provided on a side wall of the slide groove (44) away from the movable seat (41), and a positioning hole (46) is provided on a side wall of the slide groove (44) opposite to the plug hole (45). The plug hole (45) and the positioning hole (46) have the same radial cross-section and are distributed in a straight line.

5. The thermal conductivity measuring instrument according to claim 4, characterized in that: The limiting assembly (5) comprises a sliding rod (51) vertically fixedly connected to the inner wall of the handle (6), and a limiting cylinder (52) slidably connected to the sliding rod (51).

6. The thermal conductivity measuring instrument according to claim 5, characterized in that: The cross-sectional shape of the outer wall of the slide rod (51) is the same as the radial cross-sectional shape of the insertion hole (45) and the positioning hole (46); the limiting tube (52) is configured such that when it is away from the handle (6), one end thereof passes through the insertion hole (45) and is connected to the positioning hole (46) in a socket-type manner; when it is close to the handle (6), the end of the limiting tube (52) away from the handle (6) does not completely escape from the inside of the insertion hole (45).

7. The thermal conductivity measuring instrument according to claim 6, characterized in that: One end of the sliding rod (51) away from the handle (6) is located inside the insertion hole (45).

8. The thermal conductivity measuring instrument according to claim 3, characterized in that: The width of both sides of the connection block (7) is smaller than the thickness of the hole wall of the slide groove (44).

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