Specific heat capacity testing device
The device automates thermal conduction control in heat capacity testing by using insulated ropes and a retractable mechanism to stabilize sample temperature rapidly and accurately, addressing manual operation delays and inaccuracies.
Patent Information
- Application Number
- CN202422257593.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-14
- Publication Date
- 2025-07-15
- Estimated Expiration
- 2034-09-14
AI Technical Summary
The existing specific heat capacity testing device needs to manually disconnect the control switch of the heat conduction device after the sample is heated or cooled to the target temperature, and the operating reaction speed is slow, resulting in large temperature errors.
The sample is suspended by ropes, and the outer surface of the sample is wrapped with an electric heating resistor wire, combined with a temperature sensor and a telescopic switch to automatically control the contact and disconnection between the sample and the cold head, and achieve temperature stability through heat conduction.
Automatic control of sample temperature is realized, reaction speed is improved, temperature error is reduced, and testing accuracy is improved.
Smart Images
Figure CN223107696U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of specific heat capacity testing, in particular to a specific heat capacity testing device. Background Technique
[0002] Specific heat capacity is a physical quantity that measures the ability of a substance to absorb or release heat, representing the amount of heat absorbed or released when a unit mass of an object changes its unit temperature. When solving the heat conduction differential equation, the time constant and heat conduction amount of the unsteady heat conduction process, specific heat capacity is an important parameter. The specific heat capacity of most substances is a function of temperature and changes with temperature. Therefore, it is necessary to measure the specific heat capacity values of substances at different temperatures. The measurement methods of specific heat capacity can be divided into adiabatic method and non-adiabatic method. To complete the measurement of the specific heat capacity of materials in the above thermal conductivity testing system, the adiabatic method is selected as the method for measuring the specific heat capacity of this system.
[0003] However, in the actual use process of the existing specific heat capacity testing device, after the sample is heated or cooled to the target temperature, the user needs to manually disconnect the control switch of the heat conduction device. The operation reaction speed is slow, which affects the sample temperature and causes the error to become larger. In view of this problem, a specific heat capacity testing device is provided. Content of the Utility Model
[0004] The purpose of the utility model is to provide a specific heat capacity testing device to solve the problems put forward in the above background technique. To achieve the above purpose, the utility model provides the following technical scheme: A specific heat capacity testing device, including a vacuum chamber, a cold head is arranged on the left side of the bottom end inside the vacuum chamber, a fixing plate is connected to the right side of the bottom end inside the vacuum chamber through a fastener, a machine shell is arranged on the top of the fixing plate, a telescopic switch is arranged inside the machine shell, a connecting plate is arranged on the telescopic switch, the other end of the connecting plate is connected to a cold shield, three ropes are connected to the top end inside the cold shield, the bottom ends of the three ropes are connected to a sample, a temperature sensor is placed on the top of the sample, a resistance wire is wound around the outer circumference of the sample, and an auxiliary plate is arranged above the cold head.
[0005] Preferably, the ropes are adiabatic ropes.
[0006] Preferably, the cold shield is a radiation-proof cold shield.
[0007] Preferably, the three ropes are fixedly connected to the top end inside the cold shield in a radial shape and extend to the outside of the cold shield.
[0008] Preferably, the telescopic switch includes a fixed cylinder, a motor, a lead screw, a moving cylinder and a limiting component. The motor is arranged in the inner cavity of the housing. The fixed cylinder is arranged at the top of the housing. The output end of the motor extends into the inner cavity of the fixed cylinder. The lead screw is fixedly connected to the output end of the motor. The moving cylinder is slidably inserted into the inner cavity of the fixed cylinder and is screwed on the outer wall of the lead screw. The outer wall of the moving cylinder is fixedly connected to the connecting plate. The limiting component is arranged on the inner wall of the fixed cylinder and is fixedly connected to the outer wall of the moving cylinder.
[0009] Preferably, the limiting component includes a limiting groove and a limiting block. The limiting groove is opened on one side of the inner wall of the fixed cylinder. The limiting block is slidably embedded in the inner cavity of the limiting groove and is fixedly connected to the outer wall of the moving cylinder.
[0010] Preferably, the inner cavity of the limiting groove and the outer wall of the limiting block are adapted to each other and are both in a dovetail shape.
[0011] Preferably, both the resistance wire and the temperature sensor lead leave the cold shield along the rope.
[0012] Preferably, the resistance wire is double-spirally wound around the outer circumference of the sample.
[0013] Compared with the prior art, the beneficial effects of the present utility model are as follows:
[0014] 1. The sample is suspended inside the cold shield through a rope. The outer surface of the sample is double-spirally wound with an electric heating resistance wire. The top of the sample is a temperature sensor. Both the resistance wire and the temperature sensor lead leave the cold shield along the adiabatic rope. The lower end of the cold shield contacts the cold head but is not fixed. When the sample needs to be cooled, the telescopic switch descends, so that the sample and the cold shield contact the cold head, generating heat conduction and the temperature decreasing. After the temperature of the sample decreases to the target temperature, the telescopic switch ascends, so that the sample and the cold shield are disconnected from the cold head, the heat conduction is disconnected, and the temperature is basically stable. It can realize automatic control of whether the sample is heated or not, with a fast reaction speed, and solves the problem that in the actual use process of the specific heat capacity testing device in the prior art, after the sample is heated or cooled to the target temperature, the user needs to manually disconnect the control switch of the heat conduction device, with a slow operation reaction speed, affecting the sample temperature and resulting in a larger error. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 is a three-dimensional structural schematic diagram of the present utility model;
[0016] Figure 2 is a front view cross-sectional view of the telescopic switch of the present utility model;
[0017] Figure 3 is the present utility model Figure 1 magnified view at A;
[0018] Figure 4For the present utility model Figure 2 is an enlarged view of part B.
[0019] In the figure: 1, vacuum chamber; 2, cold head; 3, auxiliary plate; 4, fixing plate; 5, casing; 6, connecting plate; 7, cold shield; 8, rope; 9, sample; 10, resistance wire; 11, temperature sensor; 12, fixing cylinder; 13, motor; 14, lead screw; 15, moving cylinder; 16, limiting groove; 17, limiting block. Specific embodiments
[0020] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.
[0021] Please refer to Figures 1 to 4 , the present utility model provides a technical solution: a specific heat capacity testing device, including a vacuum chamber 1. A cold head 2 is arranged on the left side of the bottom end of the inner cavity of the vacuum chamber 1. A fixing plate 4 is connected to the right side of the bottom end of the inner cavity of the vacuum chamber 1 through fasteners. A casing 5 is arranged on the top end of the fixing plate 4. A telescopic switch is arranged in the inner cavity of the casing 5. A connecting plate 6 is arranged on the telescopic switch. The other end of the connecting plate 6 is connected to a cold shield 7. Three ropes 8 are connected to the top end of the inner cavity of the cold shield 7. The bottom ends of the three ropes 8 are connected to a sample 9. A temperature sensor 11 is placed on the top end of the sample 9. A resistance wire 10 is wound around the outer circumference of the sample 9. An auxiliary plate 3 is arranged above the cold head 2. The sample 9 is suspended inside the cold shield 7 through the ropes 8. The outer surface of the sample 9 is wound with a double helix of an electric heating resistance wire 10. The top end of the sample 9 is a temperature sensor 11. The leads of the resistance wire 10 and the temperature sensor 11 leave the cold shield 7 along the adiabatic ropes 8. The lower end of the cold shield 7 is in contact with the cold head 2 but not fixed. When the sample 9 needs to be cooled, the telescopic switch descends, so that the sample 9 and the cold shield 7 are in contact with the cold head 2, generating heat conduction and the temperature decreasing. After the temperature of the sample 9 decreases to the target temperature, the telescopic switch ascends, so that the sample 9 and the cold shield 7 are disconnected from the cold head 2, the heat conduction is disconnected, and the temperature is basically stable. It can realize automatic control of whether the sample 9 is heated or not, with a fast reaction speed, and solves the problem that in the actual use process of the specific heat capacity testing device of the prior art, after the sample 9 is heated or cooled to the target temperature, the user needs to manually disconnect the control switch of the heat conduction device, the operation reaction speed is slow, affecting the temperature of the sample 9 and resulting in a larger error.
[0022] In this embodiment, the ropes 8 are adiabatic ropes 8, avoiding heat exchange between the ropes 8 and the sample 9, resulting in a larger error.
[0023] In this embodiment, the cold shield 7 is a radiation-proof cold shield 7, which avoids heat conduction between the air inside the cold shield 7 and the air outside it.
[0024] In this embodiment, three ropes 8 are radially fixedly connected to the top end of the inner cavity of the cold shield 7 and extend to the outside of the cold shield 7, so that the sample 9 is located in the middle of the inner cavity of the cold shield 7.
[0025] In this embodiment, the telescopic switch includes a fixed cylinder 12, a motor 13, a lead screw 14, a moving cylinder 15 and a limiting component. The motor 13 is arranged in the inner cavity of the machine shell 5, the fixed cylinder 12 is arranged at the top end of the machine shell 5, the output end of the motor 13 extends into the inner cavity of the fixed cylinder 12, the lead screw 14 is fixedly connected to the output end of the motor 13, the moving cylinder 15 is slidably inserted into the inner cavity of the fixed cylinder 12 and is screwed on the outer wall of the lead screw 14, the outer wall of the moving cylinder 15 is fixedly connected to the connecting plate 6, the limiting component is arranged on the inner wall of the fixed cylinder 12 and is fixedly connected to the outer wall of the moving cylinder 15. When the motor 13 is started, the motor 13 drives the lead screw 14 to rotate. Under the action of the threaded rotational force on the outer wall of the lead screw 14, when the lead screw 14 rotates, the moving cylinder 15 can drive the cold shield 7 to slide up and down through the connecting plate 6 under the limiting action of the limiting groove 16 and the limiting block 17, so as to realize the adjustment of the position of the cold shield 7, and further realize the control of whether the sample 9 contacts the cold head 2 and the auxiliary plate 3.
[0026] In this embodiment, the limiting component includes a limiting groove 16 and a limiting block 17. The limiting groove 16 is opened on one side of the inner wall of the fixed cylinder 12. The limiting block 17 is slidably embedded in the inner cavity of the limiting groove 16 and is fixedly connected to the outer wall of the moving cylinder 15. Under the combined action of the limiting groove 16 and the limiting block 17, it can prevent the moving cylinder 15 from rotating with the lead screw 14 when the lead screw 14 rotates.
[0027] In this embodiment, the inner cavity of the limiting groove 16 and the outer wall of the limiting block 17 are in a suitable fit and are both in a dovetail shape, so that one end of the limiting block 17 can always be embedded in the inner cavity of the limiting groove 16.
[0028] In this embodiment, the leads of the resistance wire 10 and the temperature sensor 11 both leave the cold shield 7 along the rope 8.
[0029] In this embodiment, the resistance wire 10 is double-spirally wound around the outer circumference of the sample 9.
[0030] The usage method and advantages of the present utility model: When in use, the working process is as follows:
[0031] When the sample 9 needs to be cooled, the telescopic switch descends, causing the sample 9 and the cold shield 7 to contact the cold head 2, generating heat conduction and reducing the temperature. After the temperature of the sample 9 drops to the target temperature, the telescopic switch ascends, disconnecting the contact between the sample 9 and the cold shield 7 and the cold head 2, and the heat conduction is disconnected, and the temperature is basically stable. It can realize automatic control of whether the sample 9 is heated or not, with a fast reaction speed, solving the problem that in the actual use process of the specific heat capacity testing device of the prior art, after the sample 9 is heated or cooled to the target temperature, the user needs to manually disconnect the control switch of the heat conduction device, resulting in a slow operation reaction speed, affecting the temperature of the sample 9 and causing a larger error. When the telescopic switch is running, the motor 13 is started, causing the motor 13 to drive the lead screw 14 to rotate. Under the action of the rotational force of the thread on the outer wall of the lead screw 14, when the lead screw 14 rotates, the moving cylinder 15 can slide up and down through the connecting plate 6 under the limiting action of the limiting groove 16 and the limiting block 17, realizing the adjustment of the position of the cold shield 7, and further realizing the control of whether the sample 9 contacts the cold head 2 and the auxiliary plate 3 or not.
[0032] The above shows and describes the basic principles, main features and advantages of the present invention. Technical staff in this industry should understand that the present invention is not limited by the above embodiments. The above embodiments and descriptions in the specification are only preferred examples of the present invention and are not used to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.
Claims
1. Specific heat capacity testing device, including a vacuum chamber (1), characterized in that: At the left side of the bottom end of the inner cavity of the vacuum chamber (1), a cold head (2) is arranged. At the right side of the bottom end of the inner cavity of the vacuum chamber (1), a fixing plate (4) is connected by a fastener. At the top of the fixing plate (4), a machine shell (5) is arranged. Inside the machine shell (5), a telescopic switch is arranged. On the telescopic switch, a connecting plate (6) is arranged. The other end of the connecting plate (6) is connected with a cold screen (7). At the top end of the inner cavity of the cold screen (7), three ropes (8) are connected. The bottom ends of the three ropes (8) are connected with a sample (9). On the top of the sample (9), a temperature sensor (11) is placed. Around the outer circumference of the sample (9), a resistance wire (10) is wound. Above the cold head (2), an auxiliary plate (3) is arranged.
2. The specific heat capacity testing device according to claim 1, wherein: The rope (8) is a heat-insulating rope (8).
3. The specific heat capacity testing device according to claim 1, wherein: The cold screen (7) is a radiation-proof cold screen (7).
4. The specific heat capacity testing device according to claim 1, characterized in that: The three ropes (8) are radially fixedly connected to the top end of the inner cavity of the cold screen (7) and extend to the outside of the cold screen (7).
5. The specific heat capacity testing device according to claim 1, characterized in that: The telescopic switch includes a fixed cylinder (12), a motor (13), a lead screw (14), a moving cylinder (15) and a limiting component. The motor (13) is arranged inside the machine shell (5). The fixed cylinder (12) is arranged at the top of the machine shell (5). The output end of the motor (13) extends into the inner cavity of the fixed cylinder (12). The lead screw (14) is fixedly connected to the output end of the motor (13). The moving cylinder (15) is slidably inserted into the inner cavity of the fixed cylinder (12) and is screwed on the outer wall of the lead screw (14). The outer wall of the moving cylinder (15) is fixedly connected with the connecting plate (6). The limiting component is arranged on the inner wall of the fixed cylinder (12) and is fixedly connected with the outer wall of the moving cylinder (15).
6. The specific heat capacity testing device according to claim 5, wherein: The limiting component includes a limiting groove (16) and a limiting block (17). The limiting groove (16) is opened on one side of the inner wall of the fixed cylinder (12). The limiting block (17) is slidably embedded in the inner cavity of the limiting groove (16) and is fixedly connected with the outer wall of the moving cylinder (15).
7. The specific heat capacity testing device according to claim 6, wherein: The inner cavity of the limiting groove (16) and the outer wall of the limiting block (17) are in a suitable fit and are both in a dovetail shape.
8. The specific heat capacity testing device according to claim 1, wherein: The leads of the resistance wire (10) and the temperature sensor (11) both leave the cold screen (7) along the rope (8).
9. The specific heat capacity testing device according to claim 1, characterized in that: The resistance wire (10) is wound around the outer circumference of the sample (9) in a double helix.