Device and method capable of realizing boiling point measurement of liquid under different pressures in closed environment

Abstract

The invention discloses a device and a method capable of realizing liquid boiling point measurement under different pressures in a closed environment, solves the problem that liquid boiling point measurement is mostly carried out in an open environment in the prior art, and has the beneficial effect of improving the accuracy of liquid boiling point measurement. According to the specific scheme, the device capable of measuring the boiling points of the liquid under the different pressures in the closed environment comprises a reaction container, the reaction container is provided with a sample injection pipe, a locking assembly is arranged at the sample injection pipe to seal the sample injection pipe, the locking assembly is provided with an open hole, and a breather pipe is arranged at the top of the reaction container; the breather pipe is annularly provided with a condenser pipe so as to introduce cooling liquid to cool steam in the breather pipe; the inflation pipe is mounted at the top end of the breather pipe, inert gas can enter the reaction container through the inflation pipe and the breather pipe, and an air pressure sensor is arranged at the inflation pipe; a detection head of the temperature sensor can penetrate through the sample injection pipe to enter the reaction container, and a detection line of the temperature sensor penetrates through the hole of the locking assembly; and a housing.

Description

Technical Field

[0001] The invention relates to the field of liquid boiling point determination, in particular to a device and a method for determining the boiling point of liquid under different pressures in a closed environment. Background Art

[0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art.

[0003] The boiling point of a liquid refers to the temperature when the surface pressure of the liquid is equal to the external atmospheric pressure. The determination of the boiling point of a liquid can obtain the temperature variation range of the liquid during operation to determine whether the liquid meets the usage requirements. There are many methods for determining the boiling point of a liquid. Commonly used methods include thermometer measurement, water-insulated heating, etc. Most liquid boiling point determinations in the prior art are measured in an open environment, which cannot meet the measurement requirements of some liquids such as vehicle antifreeze and brake oil, because the use environment of such liquids is used in a closed environment. If measured in an open environment, the actual use environment of such liquids cannot be effectively simulated, resulting in a low accuracy problem in the measurement results. Furthermore, there is no device in the prior art that can achieve the determination of the boiling point of a liquid under different pressures in a closed environment. Summary of the invention

[0004] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a device for measuring the boiling point of liquid under different pressures in a closed environment, thereby ensuring the airtightness of the entire device during the measurement process, realizing the measurement of the boiling point of liquid in a closed environment, and ensuring the accuracy of the measurement results.

[0005] In order to achieve the above object, the present invention is implemented through the following technical solutions:

[0006] A device capable of measuring the boiling point of liquids under different pressures in a closed environment, comprising:

[0007] A reaction container is provided with a sample injection tube, the sample injection tube protrudes from the reaction container, a locking assembly is provided at the sample injection tube to close the sample injection tube, an opening is provided at the locking assembly, a vent pipe is provided at the top of the reaction container, a condenser is provided in the vent pipe in an annular direction to pass a cooling liquid to cool the steam in the vent pipe;

[0008] The gas filling pipe is installed at the top of the ventilation pipe. The gas filling pipe can be closed. Inert gas can enter the reaction container through the gas filling pipe and the ventilation pipe. A pressure sensor is arranged at the gas filling pipe.

[0009] A temperature sensor, wherein a detection head of the temperature sensor can pass through the injection tube and enter the reaction container, a detection line of the temperature sensor is arranged through an opening of the locking assembly, and a first sealing member is arranged between the detection line and the opening of the locking assembly;

[0010] The shell supports the reaction container, a controller is arranged in the shell, a temperature sensor and an air pressure sensor are respectively connected to the controller separately, a heating component is arranged inside or on the top of the shell, and the heating component is connected to the controller to heat the liquid in the reaction container.

[0011] The device for measuring the boiling point of liquids under different pressures in a closed environment as described above, wherein the condenser is provided with a water inlet and a water outlet, the water inlet is provided on a side of the condenser close to the reaction container, and the water outlet is provided on a side of the condenser away from the reaction container;

[0012] A coolant storage tank is connected between the water inlet and the drain outlet, a pump body is arranged between the water inlet and the coolant storage tank, the pump body is connected to the controller, the controller controls the pump body to open, the coolant enters through the water inlet to cool the steam in the ventilation pipe, and is discharged to the coolant storage tank through the drain outlet to achieve recycling.

[0013] As described above, a device for measuring the boiling point of liquids under different pressures in a closed environment, wherein the locking assembly comprises a sealing plug and an outer screw cap, the sealing plug can be inserted into the sample injection tube, the outer diameter of the sealing plug is adapted to the inner diameter of the sample injection tube, and the sealing plug is provided with a first opening;

[0014] A threaded structure is arranged circumferentially on the sampling tube, the external screw cap cooperates with the threaded structure of the sampling tube, the external screw cap is provided with a second opening, the first opening and the second opening are staggered, the staggered first opening and the second opening make the first sealing member arranged in an S shape, which is beneficial to improving the air tightness at the sampling tube.

[0015] In the device for measuring the boiling point of liquids under different pressures in a closed environment as described above, the first sealing member is a rubber sleeve, which is fixed to a section of the detection line of the temperature sensor in the circumferential direction, and the outer diameter of the rubber sleeve is larger than the inner diameters of the first opening and the second opening;

[0016] The inner diameter of the second opening is greater than the inner diameter of the first opening, so that it is convenient for the rubber sleeve to enter the second opening of the outer rotating cover and convenient for the outer rotating cover to move along the rubber sleeve.

[0017] As described above, in a device capable of measuring the boiling point of liquids under different pressures in a closed environment, the sealing plug is a truncated cone-shaped structural member, and the side with a smaller outer diameter of the sealing plug is inserted into the sample injection tube.

[0018] The device for measuring the boiling point of liquids under different pressures in a closed environment as described above, wherein a display screen is provided on one side of the housing, and the display screen is connected to the controller to display temperature and pressure;

[0019] A storage battery is also arranged in the shell, and the storage battery is respectively connected to the controller, the temperature sensor, the air pressure sensor and the heating component. The shell is provided with a power button and a charging button connected to the controller.

[0020] As described above, in a closed environment, the device can realize the determination of the boiling point of liquids under different pressures, wherein a pipeline solenoid valve is arranged at the gas filling pipe, and the pipeline solenoid valve is connected to the controller. The arrangement of the pipeline solenoid valve is conducive to ensuring the sealing of the gas filling pipe and the airtightness of the reaction container when the pipeline solenoid valve is closed;

[0021] The inflation tube may be fixed inside the ventilation tube, or a second sealing member may be provided at the bottom of the inflation tube, and the bottom of the inflation tube may be inserted into the top of the ventilation tube through the second sealing member;

[0022] The inflation pipe is detachably connected to the inflation hose, which is the inflation hose of the inert gas storage tank. The inflation hose is provided with an opening switch, and the inflation hose is connected to the inflation pipe. After the pipeline solenoid valve is opened, the gas enters the ventilation pipe through the inflation hose and the inflation pipe.

[0023] As described above, in a closed environment, the device can realize the determination of the boiling point of liquids under different pressures, wherein a partition is arranged in the shell, the controller is arranged on one side of the partition, the heating component can be arranged on the other side of the partition, and the reaction container, the temperature sensor and the locking component can be placed on the side of the partition;

[0024] The bottom of the reaction container is a plane, a recess is provided on the top of the shell, the bottom of the reaction container can be inserted into the recess of the shell, and the heating component is located at the recess of the shell;

[0025] Heat insulation cotton is arranged around the controller in the shell to prevent heat from damaging the controller.

[0026] Secondly, a device for measuring the boiling point of liquids under different pressures in a closed environment is used to measure the boiling point of vehicle antifreeze and brake oil.

[0027] In a third aspect, the present invention further provides a method for measuring the boiling point of a liquid under different pressures in a closed environment, wherein the device for measuring the boiling point of a liquid under different pressures in a closed environment is used, and the method comprises the following contents:

[0028] The liquid enters the reaction container through the injection tube, and after the detection line of the temperature sensor passes through the opening of the locking component, the detection head of the temperature sensor passes through the injection tube and enters the reaction container;

[0029] The inert gas enters the vent pipe through the gas charging pipe and gradually enters the reaction container. The inert gas discharges the air in the reaction container through the sampling pipe.

[0030] The locking assembly locks the sample injection tube;

[0031] During the inert gas introduction process, the pressure sensor obtains the pressure of the inert gas in the reaction container, and stops the introduction of the inert gas after the pressure of the inert gas reaches the set requirement;

[0032] The heating assembly starts heating the liquid in the reaction vessel;

[0033] During the boiling process of the liquid, the boiling point value of the liquid under the set pressure is obtained by the temperature sensor; after the measurement is completed, cooling liquid is passed into the condenser to cool the steam in the ventilation pipe.

[0034] The beneficial effects of the present invention are as follows:

[0035] 1) The device structure of the present invention is reasonably arranged. The shell can support the reaction container and is provided with a controller. The reaction container is provided with an injection tube, and the liquid enters the reaction container through the injection tube. In order to realize the determination of the boiling point of the liquid under the set pressure, an inert gas is introduced through the inflation tube. The inert gas enters the reaction container through the ventilation tube, and the air in the reaction container can be discharged. After the air is discharged, the locking component can lock the injection tube to ensure the airtightness of the reaction container. After the pressure of the inert gas reaches the set pressure, the heating component starts to heat the liquid in the reaction container, so as to realize the determination of the boiling point of the liquid under different pressures in a closed environment and ensure the accuracy of the measurement result.

[0036] 2) In the present invention, a condenser is arranged in the annular direction of the ventilation pipe, and a coolant can be introduced through the condenser to cool the steam generated when the liquid boils. The steam is pre-cooled and condensed into condensed water in the condenser and then returned to the reaction container to avoid the liquid from being discharged in the form of steam, so as to maintain the total amount of liquid and directly carry out the next boiling point measurement; and the locking assembly and the inflation pipe can be closed to simulate the actual working condition of the liquid in a closed environment.

[0037] 3) The locking assembly structure of the present invention is reasonably arranged, the sealing plug can be inserted into the injection tube to achieve the first layer of sealing, and the outer screw cap can be screwed on the injection tube to achieve the second layer of sealing. Because the temperature sensor is easily damaged in a high temperature environment and it is not easy to fix it in the reaction container, the temperature sensor is arranged through the locking assembly, but the temperature sensor and the locking assembly are sealed and connected by the first sealing member, which further ensures the airtightness at the injection tube.

[0038] 4) In the present invention, the first sealing member is a rubber sleeve, which can be fixed to the detection line of the temperature sensor in a circular direction. In this way, the detection line of the temperature sensor is fixed to the sealing plug of the locking assembly under normal conditions. After the sealing plug is inserted into the injection tube, the tightening cover is matched with the injection tube to realize the second layer of sealing. During the installation of the tightening cover, the setting of the second opening facilitates the rubber sleeve to enter the second opening.

[0039] 5) The shell structure of the present invention is reasonably arranged, a partition is arranged in the shell, a controller and a battery are arranged on one side of the partition, and a heating component is arranged on the other side. A space is arranged in the shell, and a reaction container, a temperature sensor, etc. can be placed in the shell. In this way, when the entire device is used, the entire device can be retracted, and after being retracted, the device is protected and the overall movement of the device is convenient.

[0040] 6) The device of the present invention can measure the boiling point of liquids under different pressures in a closed environment, and can be applied to the boiling point measurement of vehicle antifreeze and brake oil in a closed environment such as an engine. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0042] Figure 1 It is a schematic diagram of a device capable of measuring the boiling point of liquid under different pressures in a closed environment according to one or more embodiments of the present invention.

[0043] Figure 2 It is a side view of a shell of a device capable of measuring the boiling point of liquid under different pressures in a closed environment according to one or more embodiments of the present invention.

[0044] In the figure: the distances or sizes between parts are exaggerated to show the positions of various parts, and the schematic diagram is for reference only.

[0045] Among them: 1. Inflating hose, 2. Air pressure sensor, 3. Pipeline solenoid valve, 4. Inflating tube, 5. Drain port, 6. Condenser, 7. Vent pipe, 8. Water inlet, 9. External screw cap, 10. Sealing plug, 11. Sample injection tube, 12. Reaction container, 13. Detection head of temperature sensor, 14. Power button, 15. Inflating button, 16. Shell, 17. Controller, 18. Battery, 19. Partition, 20. Heating assembly. DETAILED DESCRIPTION

[0046] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0047] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present invention. As used herein, unless otherwise explicitly stated in the present invention, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "include" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof;

[0048] As introduced in the background technology, in the prior art, the boiling point of liquids is mostly determined in open containers, resulting in low measurement accuracy. In order to solve the above technical problems, the present invention proposes a device that can realize the boiling point determination of liquids under different pressures in a closed environment.

[0049] Embodiment 1

[0050] In a typical embodiment of the present invention, reference is made to Figure 1 As shown, a device for measuring the boiling point of liquids under different pressures in a closed environment comprises:

[0051] A reaction container 12 is provided with a sample injection tube 11, the sample injection tube 11 protrudes from the reaction container 12, a locking assembly is provided at the sample injection tube 11 to close the sample injection tube, an opening is provided in the locking assembly, a vent pipe is provided at the top of the reaction container, a condenser is provided in the vent pipe in an annular direction to allow cooling liquid to be introduced to cool the steam in the vent pipe;

[0052] The gas filling pipe 4 is installed at the top of the ventilation pipe 7. The gas filling pipe 4 can be closed. The inert gas can enter the reaction container 12 through the gas filling pipe 4 and the ventilation pipe 7. The gas filling pipe is provided with a pressure sensor 2. The inert gas can be selected from nitrogen or other safe gases.

[0053] A temperature sensor, wherein a detection head 13 of the temperature sensor can pass through the injection tube and enter the reaction container 12, a detection line of the temperature sensor is arranged through an opening of the locking assembly, and a first sealing member is arranged between the detection line and the opening of the locking assembly;

[0054] The shell 16 supports the reaction container. A controller is arranged inside the shell. The temperature sensor and the air pressure sensor are connected to the controller separately. A heating component is arranged inside or on the top of the shell. The heating component is connected to the controller to heat the liquid in the reaction container.

[0055] It can be understood that the bottom ends of the vent pipe 7 and the condenser pipe 6 are both fixed to the top of the reaction container 12, and the shape of the reaction container can be spherical, etc., without mandatory restrictions; the top of the condenser pipe 6 is flush with the top of the vent pipe 7 and a connecting plate is arranged on the circumference of the vent pipe to connect with the top of the condenser pipe, and the condenser pipe 6 is provided with a water inlet 8 and a drain port 5, the water inlet 8 is arranged on the side of the condenser pipe close to the reaction container, and the drain port 5 is arranged on the side of the condenser pipe away from the reaction container;

[0056] A coolant storage tank is connected between the water inlet 8 and the drain outlet 5 through a pipeline. The pipeline is detachably connected to the water inlet and the drain outlet respectively. The coolant can be cooling water. When needed, the corresponding pipeline is connected to the water inlet and the drain outlet respectively. A pump body is arranged between the water inlet and the coolant storage tank. The pump body is connected to a controller. The controller controls the pump body to open. The coolant enters through the water inlet to cool the steam in the ventilation pipe, and is discharged to the coolant storage tank through the drain outlet to achieve recycling.

[0057] It should be noted that, in this embodiment, the locking assembly includes a sealing plug 10 and an outer rotating cover 9, the sealing plug 10 can be a wooden plug, the sealing plug can be inserted into the sample injection tube, the outer diameter of the sealing plug is adapted to the inner diameter of the sample injection tube, the sealing plug 10 is provided with a first opening, a portion of the sealing plug 10 can be exposed to the sample injection tube, and the outer rotating cover covers the exposed portion of the sealing plug and is detachably connected to the sample injection tube;

[0058] An external thread structure is circumferentially arranged on the sampling tube 11, and an internal thread structure is arranged on the inner annular surface of the external rotary cover 9 to cooperate with the external thread structure of the sampling tube. The external rotary cover 9 is provided with a second opening, and the first opening and the second opening are staggered. The staggered first opening and the second opening make the first sealing member have an S-shaped arrangement, which is beneficial to improving the air tightness at the sampling tube.

[0059] Specifically, the first sealing member adopts a rubber sleeve, which is fixed to a section of the detection line of the temperature sensor in the circumferential direction. The outer diameter of the rubber sleeve is larger than the inner diameter of the first opening and the second opening. Because the rubber sleeve has a certain elasticity, it can be squeezed into the first opening and the second opening. Under normal circumstances, the rubber sleeve is installed at the first opening of the sealing plug, so that the temperature sensor passes through the sealing plug. The rubber sleeve is also stuck at the second opening of the outer rotating cover, but there is a set distance between the outer rotating cover and the sealing plug. After the sealing plug is inserted into the injection tube, the outer rotating cover 9 can be moved relative to the rubber sleeve to tightly connect the outer rotating cover and the injection tube, thereby playing a double-layer sealing role.

[0060] The inner diameter of the second opening is greater than the inner diameter of the first opening, so that it is convenient for the rubber sleeve to enter the second opening of the outer rotating cover, and it is convenient for the outer rotating cover 9 to move along the rubber sleeve.

[0061] In addition, it can be understood that the temperature sensor is arranged to pass through the locking assembly for easy storage; when the temperature sensor is damaged, the temperature sensor can be pulled out from the locking assembly, and another normal temperature sensor can be arranged to pass through the locking assembly to ensure the distance between the detection head of the temperature sensor and the locking assembly.

[0062] Specifically, in order to facilitate the insertion of the sealing plug 10 into the sampling tube, the sealing plug 10 is a truncated cone-shaped structure, the maximum diameter of the sealing plug is larger than the inner diameter of the sampling tube, and the side of the sealing plug with a smaller outer diameter is inserted into the sampling tube.

[0063] It is easy to understand that the controller is a PLC controller or other types of controllers, and a display screen is provided on one side of the housing, and the display screen is connected to the controller to display temperature and pressure;

[0064] A battery is also provided in the shell, and the battery is respectively connected to the controller, temperature sensor, air pressure sensor and heating assembly to supply power to each component. The shell is provided with a power button 14 and a charging button 15 connected to the controller. After the power button 14 is turned on, the power starts to supply power to each component. After the charging button 15 is turned on, the controller controls the pipeline solenoid valve 3 to open. The remaining power of the battery can also be displayed through the display screen. The display screen is an operable display screen, and the pressure setting value can also be set through the display screen.

[0065] In this embodiment, a pipeline solenoid valve 3 is provided at the inflation pipe 4, and the pipeline solenoid valve 3 is connected to the controller. The provision of the pipeline solenoid valve is beneficial to ensuring the sealing of the inflation pipe and the airtightness of the reaction container when the pipeline solenoid valve is closed; after the measurement is completed, the pipeline solenoid valve can be opened to release the pressure in the reaction container.

[0066] The inflation tube 4 can be fixed inside the ventilation tube 7; the inflation tube and the inflation hose 1 are detachably connected, and an existing inflation quick connector is provided at the inflation tube. The inflation hose can be connected to the inflation tube through the inflation quick connector. The inflation hose is the inflation hose 1 of the inert gas storage tank. The inflation hose is provided with an opening switch. The inflation hose is connected to the inflation tube. After the pipeline solenoid valve 3 is opened, the gas enters the ventilation tube through the inflation hose and the inflation tube.

[0067] In other examples, considering that the reaction container provided with the gas filling tube is too long, a second sealing member is provided at the bottom of the gas filling tube 4 to realize the detachable setting of the gas filling tube relative to the venting tube, and the bottom of the gas filling tube is inserted into the top of the venting tube through the second sealing member, and the second sealing member is specifically a sealing ring. Of course, considering the requirements for gas pressure, in most cases, the method of fixedly connecting the gas filling tube and the venting tube is selected;

[0068] In addition, considering that the housing is provided with a heating assembly 20, and also provided with electrical components such as a controller, refer to Figure 2As shown, a partition 19 is provided in the shell, and the partition divides the space in the shell into two places. A controller 17 and a battery 18 are provided on one side of the partition, and a heating component can be provided on the other side of the partition 19. A reaction container, a temperature sensor and a locking component can also be placed on the side of the partition where the heating component is provided, so that the maximum width of the reaction container is less than the height of the shell;

[0069] It is easy to understand that the bottom of the reaction container is a plane, a recess is provided on the top of the shell 16, the bottom of the reaction container can be inserted into the recess of the shell, and the heating component is located at the recess of the shell;

[0070] Insulation cotton commonly used in the prior art is arranged on one side of the partition inside the shell, i.e., around the controller and the battery, to prevent heat from damaging the controller. To further prevent the heat generated by heating from damaging the controller, a recessed portion of the shell is arranged on the side of the partition away from the controller, and a heating component 20 is arranged at the top of the recessed portion of the shell. The heating component specifically includes a heating wire, which generates heat after being heated. A vent is arranged at the bottom of the recessed portion of the shell, and a fan can be arranged on the side of the shell. The fan rotates to accelerate heat dissipation.

[0071] The device provided in this embodiment has a reasonable structure. The shell can support the reaction container and is provided with a controller. The reaction container is provided with an injection tube, and the liquid enters the reaction container through the injection tube. In order to realize the measurement of the boiling point of the liquid under the set pressure, an inert gas is introduced through the inflation tube. The inert gas enters the reaction container through the ventilation tube, and the air in the reaction container can be discharged. After the air is discharged, the locking component can lock the injection tube to ensure the airtightness of the reaction container. After the pressure of the inert gas reaches the set pressure, the heating component starts to heat the liquid in the reaction container, so as to realize the measurement of the boiling point of the liquid under different pressures in a closed environment and ensure the accuracy of the measurement result.

[0072] It can be understood that the application of a device capable of measuring the boiling point of liquids under different pressures in a closed environment is applied to the boiling point measurement of vehicle antifreeze and brake oil in a closed environment.

[0073] Embodiment 2

[0074] This embodiment provides a method for measuring the boiling point of liquid under different pressures in a closed environment, using the device for measuring the boiling point of liquid under different pressures in a closed environment described in Embodiment 1, including the following contents:

[0075] The liquid enters the reaction container through the injection tube, and after the detection line of the temperature sensor passes through the opening of the locking assembly, the detection head of the temperature sensor passes through the injection tube and enters the reaction container, and the other end of the temperature sensor is connected to the controller and the battery respectively;

[0076] The inert gas enters the vent pipe through the inflation pipe and gradually enters the reaction container. The inert gas discharges the air in the reaction container through the injection pipe. Usually, the volume of air in the reaction container is limited and can be emptied within a set time.

[0077] After the inert gas is introduced for a set time, the locking assembly is used to lock the sample injection tube. During the process of the locking assembly locking the sample injection tube, the flow rate of the inert gas can be reduced or the introduction of the inert gas can be directly shut off;

[0078] During the inert gas introduction process, the pressure sensor obtains the pressure of the inert gas in the reaction container and sends it to the controller. When the pressure of the inert gas reaches the set requirement, the introduction of the inert gas is stopped;

[0079] The heating assembly starts heating the liquid in the reaction vessel;

[0080] During the boiling process of the liquid, the boiling point value of the liquid under the set pressure is obtained by the temperature sensor;

[0081] After the measurement is completed, cooling liquid is introduced into the condenser to cool the steam in the ventilation pipe;

[0082] After the set time has passed since the measurement ended, the condensed water returns to the reaction vessel to ensure the total amount of liquid, the inert gas is reintroduced into the inflation tube, and after reaching the set pressure, the boiling point of the liquid is measured at another pressure. This is repeated multiple times to achieve the measurement of the boiling point of the liquid at different pressures in a closed environment.

[0083] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A device for measuring the boiling point of liquids under different pressures in a closed environment, characterized in that: include: A reaction container is provided with a sample injection tube, the sample injection tube protrudes from the reaction container, a locking assembly is provided at the sample injection tube to close the sample injection tube, an opening is provided at the locking assembly, a vent pipe is provided at the top of the reaction container, a condenser is provided in the vent pipe in an annular direction to pass a cooling liquid to cool the steam in the vent pipe; The gas filling pipe is installed at the top of the ventilation pipe. The gas filling pipe can be closed. Inert gas can enter the reaction container through the gas filling pipe and the ventilation pipe. A pressure sensor is arranged at the gas filling pipe. A temperature sensor, wherein a detection head of the temperature sensor can pass through the injection tube and enter the reaction container, a detection line of the temperature sensor is arranged through an opening of the locking assembly, and a first sealing member is arranged between the detection line and the opening of the locking assembly; The shell supports the reaction container, a controller is arranged in the shell, a temperature sensor and an air pressure sensor are respectively connected to the controller separately, a heating component is arranged inside or on the top of the shell, and the heating component is connected to the controller to heat the liquid in the reaction container.

2. The device for measuring the boiling point of liquids under different pressures in a closed environment according to claim 1, characterized in that: The condenser is provided with a water inlet and a drain outlet, the water inlet is provided on a side of the condenser close to the reaction container, and the drain outlet is provided on a side of the condenser away from the reaction container; A coolant storage tank is connected between the water inlet and the drain outlet, a pump body is arranged between the water inlet and the coolant storage tank, and the pump body is connected to the controller.

3. The device for measuring the boiling point of liquids under different pressures in a closed environment according to claim 1, characterized in that: The locking assembly comprises a sealing plug and an outer rotating cover, the sealing plug can be inserted into the sample injection tube, the outer diameter of the sealing plug is adapted to the inner diameter of the sample injection tube, and the sealing plug is provided with a first opening; The sampling tube is provided with a thread structure in the circumferential direction, the external rotary cover cooperates with the thread structure of the sampling tube, the external rotary cover is provided with a second opening, and the first opening and the second opening are arranged in a staggered manner.

4. The device for measuring the boiling point of liquids under different pressures in a closed environment according to claim 3, characterized in that: The first sealing member is a rubber sleeve, which is fixed to a section of the detection line of the temperature sensor in the circumferential direction, and the outer diameter of the rubber sleeve is larger than the inner diameters of the first opening and the second opening; The inner diameter of the second opening is greater than the inner diameter of the first opening.

5. The device for measuring the boiling point of liquids under different pressures in a closed environment according to claim 3, characterized in that: The sealing plug is a truncated cone-shaped structural component, and the side of the sealing plug with a smaller outer diameter is inserted into the sample injection tube.

6. The device for measuring the boiling point of liquids under different pressures in a closed environment according to claim 1, characterized in that: A display screen is provided on one side of the housing, and the display screen is connected to the controller to display temperature and pressure; A storage battery is also arranged in the shell, and the storage battery is respectively connected to the controller, the temperature sensor, the air pressure sensor and the heating component. The shell is provided with a power button and a charging button connected to the controller.

7. The device for measuring the boiling point of liquids under different pressures in a closed environment according to claim 1, characterized in that: A pipeline solenoid valve is provided at the inflation pipe, and the pipeline solenoid valve is connected to the controller; The inflation tube may be fixed inside the ventilation tube, or a second sealing member may be provided at the bottom of the inflation tube, and the bottom of the inflation tube may be inserted into the top of the ventilation tube through the second sealing member; The inflation tube is detachably connected to the inflation hose.

8. The device for measuring the boiling point of liquids under different pressures in a closed environment according to claim 1, characterized in that: A partition is provided in the shell, the controller is provided on one side of the partition, the heating component can be provided on the other side of the partition, and the reaction container, the temperature sensor and the locking component can be placed on the side of the partition; The bottom of the reaction container is a plane, a recess is provided on the top of the shell, the bottom of the reaction container can be inserted into the recess of the shell, and the heating component is located at the recess of the shell; Heat insulation cotton is arranged on the peripheral side of the controller in the shell.

9. Use of a device capable of measuring the boiling point of liquids under different pressures in a closed environment according to any one of claims 1 to 8, characterized in that: Applied to the boiling point determination of vehicle antifreeze and brake oil.

10. A method for measuring the boiling point of liquids under different pressures in a closed environment, characterized in that: A device for measuring the boiling point of liquids under different pressures in a closed environment according to any one of claims 1 to 8, comprising the following contents: The liquid enters the reaction container through the injection tube, and after the detection line of the temperature sensor passes through the opening of the locking component, the detection head of the temperature sensor passes through the injection tube and enters the reaction container; The inert gas enters the vent pipe through the gas charging pipe and gradually enters the reaction container. The inert gas discharges the air in the reaction container through the sampling pipe. The locking assembly locks the sample injection tube; During the inert gas introduction process, the pressure sensor obtains the pressure of the inert gas in the reaction container, and stops the introduction of the inert gas after the pressure of the inert gas reaches the set requirement; The heating assembly starts heating the liquid in the reaction vessel; During the boiling process of the liquid, the boiling point value of the liquid under the set pressure is obtained by the temperature sensor; After the measurement is completed, cooling liquid is passed into the condenser to cool the steam in the ventilation pipe.

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