Oxygen bomb calorimeter, liquid path of oxygen bomb calorimeter and liquid path temperature control method

Abstract

The invention relates to the technical field of calorific value detection, and particularly discloses an oxygen bomb calorimeter, a liquid path of the oxygen bomb calorimeter and a liquid path temperature control method.The liquid path of the oxygen bomb calorimeter comprises a liquid storage tank, a first pump, a refrigerator, an outer barrel, a second pump, a heater, a first valve, an inner barrel and a second valve, and the first pump and the refrigerator are connected between an outlet and an inlet of the liquid storage tank; the second pump and the heater are connected between the inlet and the outlet of the outer barrel, the first valve is connected between the first pump and the inlet of the outer barrel and used for connecting or disconnecting the first pump and the outer barrel, and the second valve is connected between the first pump and the inlet of the inner barrel and used for connecting or disconnecting the first pump and the inner barrel. According to the liquid path of the oxygen bomb calorimeter and the liquid path temperature control method provided by the invention, the outer barrel and the liquid storage tank can realize self-circulation temperature control and can be respectively controlled at different target temperatures. During testing, the outer barrel does not participate in the liquid storage tank and the inner barrel, and the testing efficiency is improved. And the liquid path is simple in structure and few in parts.

Description

Technical Field

[0001] The present application relates to the technical field of calorific value detection, and more specifically, to an oxygen bomb calorimeter and a liquid circuit and a liquid circuit temperature control method thereof. Background Art

[0002] Oxygen bomb calorimeter is an instrument used to measure the calorific value of a substance that can be completely burned in high-pressure oxygen. It mainly includes various types such as fully automatic oxygen bomb calorimeter, oxygen bomb calorimeter and oxygen bomb calorimeter. Its characteristics are that it uses oxygen as a combustion aid and evaluates the calorific value of a substance by measuring the heat released when the substance is completely burned in high-pressure oxygen.

[0003] A common oxygen bomb calorimeter includes a water tank, an inner barrel and an outer barrel that are nested with water, and uses water as a medium in which an oxygen bomb (oxygen bomb calorimeter is a sealed container that is resistant to high temperature, high pressure and high corrosion) is immersed. The heat of combustion of the oxygen bomb is obtained by measuring the change in water temperature. The water in the inner barrel requires the same amount of water for each test, and it needs to be replaced after each test to achieve a basically consistent water temperature before each test. The outer barrel is usually a closed water jacket that uses water as a medium for temperature control so that the temperature of the outer barrel remains unchanged during the test (constant temperature method) or changes with the temperature of the inner barrel (adiabatic method). Generally, the water in the outer barrel needs to be self-circulating and have heating and cooling components for temperature control. In addition to replenishing water when there is no water or water shortage in the outer barrel, the amount of water in the self-circulation is in a closed state.

[0004] The water tank is the water storage unit of the oxygen bomb calorimeter, which is generally connected to the atmosphere. Since the water in the inner barrel needs to be replaced every time the test is done, and the temperature of the water in the inner barrel will rise after the test, in order to make the test faster and more efficient, the water tank needs to be equipped with self-circulation and heating and cooling temperature control functions. In addition, the water tank can be connected to the outer barrel through corresponding water pipes, water pumps and valves to realize the function of water inlet and water replenishment of the outer barrel; the water tank can also be connected to the inner barrel through corresponding water pipes, water pumps and valves to realize the functions of water inlet, water discharge and water quantitative measurement of the inner barrel.

[0005] In the process of implementing this application, the inventors found that there are at least the following problems in the prior art:

[0006] The water in the outer barrel of a common bomb calorimeter is not completely isolated. During the test, the water in the outer barrel enters the inner barrel, or after the test, the water in the inner barrel enters the water tank and the outer barrel, making it difficult for the outer barrel to return to its original temperature and stabilize in a short period of time, which has a certain negative impact on the outer barrel's constant temperature performance and test efficiency. Summary of the invention

[0007] In view of this, the purpose of the present application is to provide an oxygen bomb calorimeter and its liquid circuit and liquid circuit temperature control method, which can effectively solve the problem that the outer barrel and inner barrel of the bomb calorimeter are not completely isolated, thereby affecting the test.

[0008] In order to achieve the above objectives, this application provides the following technical solutions:

[0009] A liquid circuit of an oxygen bomb calorimeter, comprising:

[0010] A liquid storage tank self-circulation loop comprises a liquid storage tank, a first pump and a refrigerator, wherein the first pump and the refrigerator are connected between an outlet and an inlet of the liquid storage tank, and the refrigerator is used to cool the liquid in the liquid storage tank to below room temperature;

[0011] The outer barrel self-circulation loop comprises an outer barrel, a second pump and a heater, wherein the second pump and the heater are connected between the inlet and the outlet of the outer barrel, and the heater is used to heat the liquid in the outer barrel to above room temperature;

[0012] The outer barrel liquid inlet liquid circuit comprises the first pump and a first valve connected between the first pump and the inlet of the outer barrel, wherein the first valve is used to connect or disconnect the first pump and the outer barrel, and when the first pump is connected to the outer barrel, the first pump is used to pump the liquid in the liquid storage tank into the outer barrel;

[0013] The inner barrel liquid inlet liquid circuit is used to add a fixed amount of liquid in the liquid storage tank into the inner barrel. The inner barrel liquid inlet liquid circuit includes the inner barrel, the first pump, and a second valve connected between the first pump and the inlet of the inner barrel. The second valve is used to connect or disconnect the first pump and the inner barrel. When the first pump is connected to the inner barrel, the first pump is used to pump the liquid in the liquid storage tank into the inner barrel.

[0014] Optionally, in the liquid circuit of the oxygen bomb calorimeter, the inner barrel liquid inlet liquid circuit further includes a third valve and a measuring cup, and the third valve and the measuring cup are sequentially connected between the first pump and the second valve;

[0015] The first pump is used to pump the liquid in the liquid storage tank to the measuring cup when the second valve disconnects the measuring cup and the inner barrel and the third valve connects the first pump and the measuring cup. The measuring cup is used to measure a fixed amount of the liquid to add to the inner barrel.

[0016] Optionally, in the liquid circuit of the above-mentioned oxygen bomb calorimeter, the height of the measuring cup is higher than the height of the inner barrel, so that when the second valve connects the measuring cup and the inner barrel, a fixed amount of the liquid in the measuring cup flows into the inner barrel.

[0017] Optionally, in the liquid circuit of the above oxygen bomb calorimeter, the measuring cup is provided with an overflow port, and the overflow port of the measuring cup is connected to the liquid storage tank.

[0018] Optionally, in the liquid circuit of the above-mentioned oxygen bomb calorimeter, a liquid level detection device is provided in the inner barrel, and the liquid level detection device is used to detect the liquid level in the inner barrel, and the second valve is used to disconnect the first pump and the inner barrel when the liquid level detection device detects that the liquid level in the inner barrel reaches a preset liquid level.

[0019] Optionally, in the liquid circuit of the oxygen bomb calorimeter, the outer barrel is provided with an overflow port, and the overflow port of the outer barrel is connected to the liquid storage tank.

[0020] Optionally, in the liquid circuit of the above-mentioned oxygen bomb calorimeter, the inner barrel is provided with a drain valve, the drain valve is connected to the liquid storage tank through a drain pump, the drain valve is used to connect or disconnect the inner barrel and the drain pump, and the drain pump is used to pump the liquid in the inner barrel to the liquid storage tank when the drain valve is opened.

[0021] Optionally, in the liquid circuit of the oxygen bomb calorimeter, the first valve and the second valve are both normally closed two-position two-way solenoid valves.

[0022] This application also provides the following technical solutions:

[0023] A method for controlling the temperature of a liquid circuit of an oxygen bomb calorimeter, used in any of the above liquid circuits, comprising:

[0024] The first pump and the refrigerator are turned on to allow the liquid in the liquid storage tank to circulate in the liquid storage tank self-circulation loop and be cooled to a first set temperature, wherein the first set temperature is lower than room temperature;

[0025] The first valve connects the first pump and the outer barrel. When the first pump is turned on, the liquid in the liquid storage tank is pumped into the outer barrel. When the liquid in the outer barrel reaches a preset amount, the first valve disconnects the first pump and the outer barrel to isolate the outer barrel from the liquid storage tank.

[0026] The heater and the second pump are turned on to allow the liquid in the outer barrel to circulate in the outer barrel self-circulation loop and be heated to a second set temperature, wherein the second set temperature is higher than room temperature;

[0027] The first pump is turned on, the first valve disconnects the first pump from the outer barrel, the second valve connects the first pump to the inner barrel, and the first pump pumps a fixed amount of liquid in the liquid storage tank into the inner barrel.

[0028] By using the oxygen bomb calorimeter and its liquid circuit and liquid circuit temperature control method provided by the present application, the outer barrel and the liquid storage tank can both be self-circulating and temperature controlled through the setting of the temperature control liquid circuit, that is, the two can achieve independent temperature control and can be controlled at different target temperatures respectively. During the test, the first valve disconnects the connection between the first pump and the outer barrel, that is, the outer barrel is completely isolated from the inner barrel, and the outer barrel does not participate in the liquid storage tank and the inner barrel, thereby achieving the isolation of the liquid circuit and independent temperature control of the outer barrel, so that it will not affect the test. After the test is completed, the liquid with the increased temperature in the inner barrel only returns to the liquid storage tank, which does not affect the temperature control of the outer barrel, thereby improving the test efficiency. In addition, the liquid circuit structure is simple, and only one refrigerator and one heater are required to achieve independent temperature control of the outer barrel and the liquid storage tank. The first valve and the second valve cooperate to achieve the isolation of the outer barrel, the number of parts is small, and the connection structure is simple, thereby reducing the preparation and maintenance costs. In addition, the first valve can be started and stopped in combination with the first pump to replenish the low-temperature liquid in the liquid storage tank into the outer barrel, or the higher-temperature liquid in the outer barrel into the liquid storage tank, so as to supplement the temperature control capabilities of the outer barrel and the liquid storage tank.

[0029] In order to achieve the above object, the present application also provides an oxygen bomb calorimeter, which includes any of the above liquid circuits. Since the above liquid circuit has the above technical effects, the oxygen bomb calorimeter having the liquid circuit should also have corresponding technical effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0031] Figure 1 It is a schematic diagram of a calorimeter liquid circuit in the prior art;

[0032] Figure 2 It is a schematic diagram of another calorimeter liquid circuit in the prior art;

[0033] Figure 3 A schematic diagram of a liquid circuit of an oxygen bomb calorimeter according to a specific embodiment of the present application;

[0034] Figure 4 This is a schematic diagram of a liquid circuit of an oxygen bomb calorimeter according to another specific embodiment of the present application.

[0035] Reference numerals:

[0036] 011-outer barrel; 012-inner barrel; 013-liquid storage tank; 014-main liquid inlet valve; 015-inner barrel liquid inlet valve; 016-reflux valve; 017-inline pump; 018-circulating pump; 019-refrigerator; 020-heater;

[0037] 11-liquid storage tank; 12-first pump; 13-refrigerator; 14-outer barrel; 15-second pump; 16-heater; 17-first valve; 18-inner barrel; 19-second valve; 20-third valve; 21-measuring cup; 22-discharge pump. DETAILED DESCRIPTION

[0038] The embodiment of the present application discloses an oxygen bomb calorimeter and a liquid circuit and a liquid circuit temperature control method thereof, so as to achieve complete isolation of an outer barrel and an inner barrel through a simple structure, thereby improving detection efficiency.

[0039] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0040] Figure 1 The figure shows a calorimeter liquid circuit, in which two normally open electromagnetic valves are arranged on the pipeline connecting the liquid storage tank 013 and the outer barrel 011. The liquid storage tank 013 has a self-circulating temperature control function to make the water temperature of the outer barrel 011 and the liquid storage tank 013 consistent and constant. During the test, the main liquid inlet valve 014 and the inner barrel liquid inlet valve 015 are opened, and the return valve 016 is closed (opened). The liquid in the liquid storage tank 013 enters the inner barrel 012 through the inline pump 017 and the inner barrel liquid inlet valve 015. When the amount of liquid in the inner barrel 012 reaches a predetermined amount, the inner barrel liquid inlet valve 015 is closed, and then the return valve 016 is opened (closed) to restore the water circulation between the outer barrel 011 and the liquid storage tank 013. After the test is completed, close (open) the main liquid inlet valve 014, open the inline pump 017 and the inner barrel liquid inlet valve 015, and the liquid in the inner barrel 012 returns to the liquid storage tank 013. After completion, the liquid circulation between the outer barrel 011 and the liquid storage tank 013 is restored.

[0041] However, this solution has the following shortcomings: the outer barrel 011 and the liquid storage tank 013 are circulated and connected for most of the time, and the temperature is controlled synchronously. During each test, the liquid in the outer barrel 011 participates in the inner barrel 012, so the liquid circuit of the outer barrel 011 is not independent. During the test, the liquid (high-temperature liquid) in the inner barrel 012 after the test enters the liquid storage tank 013 and the outer barrel 011, making it difficult for the outer barrel 011 to restore the original temperature and stabilize in a short time, which has a certain negative impact on the constant temperature performance and test efficiency of the outer barrel 011.

[0042] Figure 2Another calorimeter liquid circuit is shown, the liquid storage tank 013 is provided with a circulating pump 018 for self-circulation temperature control, and is connected to a heater 020 and a refrigerator 019. The outer barrel 011 is also provided with a circulating pump 018 for independent self-circulation temperature control, and is also connected to a heater 020 and a refrigerator 019. When the outer barrel 011 is filled with water, the water inlet pump and the outer barrel valve are opened to achieve water inlet to the outer barrel 011. During the test, the water inlet pump and the inner barrel valve are opened, and the inner barrel valve is closed when the amount of liquid in the inner barrel 012 reaches a predetermined amount. After the test is completed, the liquid in the inner barrel 012 is discharged back to the liquid storage tank 013 through the inner barrel drain valve and the diaphragm pump. During the test, the outer barrel 011 of the liquid circuit does not exchange with the liquid in the inner barrel 012 or the liquid storage tank 013 at all, and the liquid circuit of the outer barrel 011 and the liquid storage tank 013 is completely isolated.

[0043] However, this solution has the following disadvantages: the outer barrel 011 and the liquid storage tank 013 are respectively connected to a heater 020 and a refrigerator 019 for temperature control, and the number of electromagnetic valves and liquid pumps used is also large. That is, the liquid circuit uses many components, the liquid circuit is complex, and the cost is high.

[0044] In order to at least partially solve the above-mentioned defects, the present application provides a liquid circuit of an oxygen bomb calorimeter. Figure 3 and Figure 4 The preferred embodiments of the present application are described.

[0045] In some examples, the present application provides a liquid circuit of an oxygen bomb calorimeter, including a self-circulating loop of a liquid storage tank 11, a self-circulating loop of an outer barrel, a liquid inlet circuit of an outer barrel, and a liquid inlet circuit of an inner barrel. The self-circulating loop of the liquid storage tank 11 includes the liquid storage tank 11, a first pump 12, and a refrigerator 13, the first pump 12 and the refrigerator 13 are connected between the outlet and the inlet of the liquid storage tank 11, and the refrigerator 13 is used to cool the liquid in the liquid storage tank 11 to below room temperature. Specifically, the liquid storage tank 11, the first pump 12 and the refrigerator 13 can be connected by pipelines. For example, the first pump 12 and the refrigerator 13 are connected between the outlet and the inlet of the liquid storage tank 11 in sequence. When the first pump 12 is started, the liquid in the liquid storage tank 11 can be discharged through the outlet of the liquid storage tank 11, and after cooling through the refrigerator 13, it flows back to the liquid storage tank 11 through the inlet of the liquid storage tank 11, so as to realize the circulation of the liquid in the self-circulation loop of the liquid storage tank 11, so as to cool the liquid in the self-circulation loop of the liquid storage tank 11, thereby realizing the temperature control of the liquid in the liquid storage tank 11. The liquid in the liquid storage tank 11 is cooled to below the room temperature by the refrigerator 13, that is, the target set temperature of the liquid storage tank 11 is lower than the room temperature, so that the temperature control process does not require heating. In some cases, if it is necessary to heat the liquid in the liquid storage tank 11, the first valve 17 can be opened, the first pump 12 is opened, and the liquid with a higher temperature in the outer barrel 14 is pumped into the liquid storage tank 11 to increase the temperature of the liquid in the liquid storage tank 11.

[0046] The outer barrel self-circulation loop includes an outer barrel 14, a second pump 15 and a heater 16. The second pump 15 and the heater 16 are connected between the inlet and the outlet of the outer barrel 14. The heater 16 is used to heat the liquid in the outer barrel 14 to above the room temperature. Specifically, the outer barrel 14, the second pump 15 and the heater 16 can be connected by a pipeline. For example, the second pump 15 and the heater 16 are sequentially connected between the liquid outlet and the liquid inlet of the outer barrel 14. When the second pump 15 is started, the liquid in the outer barrel 14 can be discharged through the liquid outlet of the outer barrel 14, and after flowing through the heater 16, it flows back to the outer barrel 14 from the liquid inlet of the outer barrel 14, so as to realize the circulation of the liquid in the outer barrel self-circulation loop, so as to heat the liquid in the outer barrel self-circulation loop, thereby realizing the temperature control of the liquid in the outer barrel 14.

[0047] The outer barrel liquid inlet liquid path includes a first pump 12 and a first valve 17 connected between the first pump 12 and the inlet of the outer barrel 14. The first valve 17 is used to connect or disconnect the first pump 12 and the outer barrel 14. When the first pump 12 is connected to the outer barrel 14, the first pump 12 is used to pump the liquid in the liquid storage tank 11 to the outer barrel 14. The outer barrel liquid inlet liquid path is used to inject liquid into the outer barrel 14. It shares the first pump 12 with the liquid storage tank 11 self-circulating loop. Specifically, the outlet of the liquid storage tank 11 is connected to one end of the first pump 12, and the other end of the first pump 12 is respectively connected to the first valve 17 and the inlet of the refrigerator 13. The first pump 12 is started, the first valve 17 is opened, and the liquid in the liquid storage tank 11 can enter the outer barrel 14 through the first pump 12. After the outer barrel 14 is filled with water, the first valve 17 is closed, and the liquid in the outer barrel 14 is isolated from the liquid in the liquid storage tank 11. At this time, the second pump 15 and the heater 16 can be turned on, and the outer barrel 14 is self-circulating and temperature controlled to heat the temperature of the liquid in the outer barrel 14 to a temperature higher than room temperature, that is, the set temperature of the outer barrel 14 is higher than room temperature, so that the temperature control process of the outer barrel 14 does not require refrigeration. In some cases, if the outer barrel 14 needs to be cooled, the first valve 17 can be opened, and the first pump 12 is started to pump the liquid with a lower temperature in the liquid storage tank 11 into the outer barrel 14 to reduce the temperature of the liquid in the outer barrel 14.

[0048] The inner barrel liquid inlet liquid path is used to add a fixed amount of liquid in the liquid storage tank 11 to the inner barrel 18. The inner barrel liquid inlet liquid path includes a first pump 12 and a second valve 19 connected between the first pump 12 and the inlet of the inner barrel 18. The second valve 19 is used to connect or disconnect the first pump 12 and the inner barrel 18. When the first pump 12 is connected to the inner barrel 18, the first pump 12 is used to pump the liquid in the liquid storage tank 11 to the inner barrel 18. The inner barrel liquid inlet liquid path is used to inject a fixed amount of liquid into the inner barrel 18. It shares the first pump 12 with the self-circulating loop of the liquid storage tank 11, that is, a liquid pump is provided for the self-circulation of the liquid storage tank 11, the liquid inlet of the outer barrel 14 and the liquid inlet of the inner barrel 18. Specifically, the outlet of the liquid storage tank 11 is connected to one end of the first pump 12, and the other end of the first pump 12 is respectively connected to the first valve 17, the second valve 19 and the inlet of the refrigerator 13. During the test, the first pump 12 is started, the second valve 19 is opened, and the liquid in the liquid storage tank 11 can enter the inner barrel 18 through the first pump 12. After the inner barrel 18 is filled with water, the second valve 19 is closed. After the test is completed, the liquid in the inner barrel 18 can be discharged, and the liquid can be refilled during the next measurement.

[0049] By using the liquid circuit of the oxygen bomb calorimeter provided by the present application, the outer barrel 14 and the liquid storage tank 11 can both be self-circulating and temperature controlled by setting the temperature control liquid circuit, that is, the two can achieve independent temperature control and can be controlled at different target temperatures. During the test, the first valve 17 disconnects the connection between the first pump 12 and the outer barrel 14, that is, the outer barrel 14 is completely isolated from the inner barrel 18, and the outer barrel 14 does not participate in the liquid storage tank 11 and the inner barrel 18, so that the liquid circuit isolation and independent temperature control of the outer barrel 14 are achieved, so that the test will not be affected. After the test is completed, the liquid with the increased temperature of the inner barrel 18 only returns to the liquid storage tank 11, which does not affect the temperature control of the outer barrel 14, thereby improving the test efficiency. In addition, the liquid circuit structure is simple, and only one refrigerator 13 and one heater 16 are required to achieve independent temperature control of the outer barrel 14 and the liquid storage tank 11. The first valve 17 and the second valve 19 cooperate to achieve the isolation of the outer barrel 14, the number of parts is small, and the connection structure is simple, thereby reducing the preparation and maintenance costs. In addition, the first valve 17 can be started and stopped in combination with the first pump 12 to replenish the low-temperature liquid in the liquid storage tank 11 into the outer barrel 14, or the higher-temperature liquid in the outer barrel 14 into the liquid storage tank 11, so as to supplement the temperature control capabilities of the outer barrel 14 and the liquid storage tank 11.

[0050] Specifically, the target temperature of the outer barrel 14 can be set slightly higher than the ambient temperature according to the standard requirements, and the temperature is controlled by the heater 16 connected in series to the self-circulating loop of the outer barrel. When the controlled temperature is higher than the target temperature of the outer barrel 14, the first valve 17 is started and stopped to control the amount of water entering the outer barrel 14 from the liquid storage tank 11 so that the temperature of the outer barrel 14 returns to its target temperature. The target temperature of the liquid storage tank 11 can be set slightly lower than or approximately equal to the ambient temperature according to the standard requirements, and the temperature is controlled by the refrigerator 13 connected in series to the self-circulating loop of the liquid storage tank 11. When the controlled temperature is lower than the target temperature of the liquid storage tank 11, the first valve 17 is started and stopped to control the amount of water flowing back from the outer barrel 14 to the liquid storage tank 11 so that the temperature of the liquid storage tank 11 returns to its target temperature.

[0051] When the inner barrel 18 is filled with liquid, the amount of liquid in the inner barrel 18 needs to be controlled, that is, the inner barrel 18 is quantitatively filled with liquid. Specifically, the quantitative filling of liquid can be achieved by means of a measuring cup 21 or by means of a liquid level detection device provided in the inner barrel 18. When the measuring cup 21 is used, the liquid in the inner barrel 18 can be the liquid in the liquid storage tank 11 passing through the measuring cup 21 to fill the inner barrel 18. When the liquid level detection device is used, the liquid in the inner barrel 18 can be the liquid in the liquid storage tank 11 directly filling the inner barrel 18. The following is an explanation of the two implementations.

[0052] See also Figure 3 In one embodiment, quantitative liquid inlet is achieved by means of a measuring cup 21. The inner barrel liquid inlet liquid circuit also includes a third valve 20 and a measuring cup 21, and the third valve 20 and the measuring cup 21 are connected between the first pump 12 and the second valve 19 in sequence. Specifically, a third valve 20 and a measuring cup 21 are also provided in the pipeline of the inner barrel liquid inlet liquid circuit, and the third valve 20 is connected between the outlet of the first pump 12 and the inlet of the measuring cup 21, and the outlet of the measuring cup 21 is connected to the inner barrel 18. The first pump 12 is used to pump the liquid in the liquid storage tank 11 to the measuring cup 21 when the second valve 19 disconnects the measuring cup 21 from the inner barrel 18 and the third valve 20 connects the first pump 12 and the measuring cup 21, and the measuring cup 21 is used to measure a certain amount of liquid to add to the inner barrel 18. Specifically, during the test, the first pump 12 and the third valve 20 are first opened, and the first pump 12 pumps the liquid in the liquid storage tank 11 to the measuring cup 21, that is, the measuring cup 21 is filled with liquid, and the measuring cup 21 is used to measure a fixed amount of liquid to add to the inner barrel 18, that is, until the liquid in the measuring cup 21 reaches the target amount, the third valve 20 is closed, the second valve 19 is opened, and the liquid in the measuring cup 21 flows into the inner barrel 18. The measuring cup 21 can be used to conveniently measure a fixed amount of liquid, and the specific fixed amount value can be controlled accordingly according to the scale of the measuring cup 21, or can be adjusted by replacing the measuring cup 21 with a different volume.

[0053] In some embodiments, the height of the measuring cup 21 is higher than the height of the inner barrel 18, so that when the second valve 19 connects the measuring cup 21 and the inner barrel 18, a fixed amount of liquid in the measuring cup 21 flows into the inner barrel 18. By arranging the measuring cup 21 above the inner barrel 18, when the second valve 19 is opened to connect the measuring cup 21 and the inner barrel 18, the liquid in the measuring cup 21 can automatically flow into the inner barrel 18 under the action of its own gravity. As set above, the liquid in the measuring cup 21 can be injected into the inner barrel 18 without setting a power component. In other embodiments, a liquid pump can also be set between the measuring cup 21 and the inner barrel 18 to pump the liquid in the measuring cup 21 to the inner barrel 18.

[0054] In some embodiments, the measuring cup 21 is provided with an overflow port, and the overflow port of the measuring cup 21 is connected to the liquid storage tank 11. During testing, the third valve 20 is opened, and the liquid in the liquid storage tank 11 enters the measuring cup 21 until the measuring cup 21 is full, and the excess liquid overflows back to the liquid storage tank 11. At the same time, the first valve 17 can be controlled to open so that the liquid in the liquid storage tank 11 enters the outer barrel 14 to keep the outer barrel 14 full. By setting the overflow port, the measuring cup 21 can directly achieve quantitative control by overflowing the corresponding amount of liquid in the measuring cup 21 when adding liquid.

[0055] See also Figure 4 In other embodiments, quantitative liquid inlet is achieved by setting a liquid level detection device in the inner barrel 18. This embodiment is different from the above-mentioned method of achieving quantitative liquid inlet by using a measuring cup 21. It does not need to set a measuring cup 21 in the inner barrel liquid inlet liquid path. Instead, a liquid level detection device is set in the inner barrel 18. The liquid level detection device is used to detect the liquid level in the inner barrel 18. The second valve 19 is used to disconnect the first pump 12 and the inner barrel 18 when the liquid level detection device detects that the liquid level in the inner barrel 18 reaches a preset liquid level. That is, by setting a liquid level detection device, the liquid level in the inner barrel 18 can be detected. When the liquid level reaches the preset liquid level, it indicates that the amount of liquid in the inner barrel 18 reaches the corresponding quantitative amount, and the second valve 19 can be closed to stop the liquid inlet. The setting of the liquid level detection device further simplifies the structure of the inner barrel liquid inlet liquid path. The liquid level detection device can specifically use a probe.

[0056] In some embodiments, see Figure 3 and Figure 4 , the outer barrel 14 is provided with an overflow port, and the overflow port of the outer barrel 14 is connected to the liquid storage tank 11. Specifically, the overflow port of the outer barrel 14 is connected to the liquid storage tank 11 through an overflow pipe. By setting the overflow port in the outer barrel 14, when the outer barrel 14 is filled with liquid, the liquid in the liquid storage tank 11 is pumped to the outer barrel 14 by the action of the first pump 12, until the outer barrel 14 is full of liquid and overflows back to the liquid storage tank 11. As arranged above, the outer barrel 14 can be directly filled with liquid when adding liquid. Specifically, the first valve 17 is used for the outer barrel 14 to fill with liquid, and when the outer barrel 14 is full of liquid, the liquid returns to the liquid storage tank 11 through the overflow pipe of the outer barrel 14, and no other valves are set for the outer barrel 14 to fill with water.

[0057] In some embodiments, the inner barrel 18 is provided with a drain valve, which is connected to the liquid storage tank 11 through a drain pump 22. The drain valve is used to connect or disconnect the inner barrel 18 and the drain pump 22. The drain pump 22 is used to pump the liquid in the inner barrel 18 to the liquid storage tank 11 when the drain valve is opened. The inner barrel 18 is drained by setting a drain valve in the inner barrel 18 and cooperating with the drain pump 22. After the test is completed, the drain pump 22 can be turned on and the drain valve can be opened, so that the drain pump 22 pumps the liquid in the inner barrel 18 back to the liquid storage tank 11. The liquid in the liquid storage tank 11 can be temperature-controlled through the liquid storage tank self-circulation loop to meet the next test requirements. Specifically, the drain pump 22 can use a diaphragm pump, that is, the liquid cannot circulate when the diaphragm pump is not turned on, and the liquid can circulate from the inner barrel 18 to the liquid storage tank 11 after starting.

[0058] In some embodiments, the first valve 17 and the second valve 19 are both two-position two-way solenoid valves, and specifically can be normally closed two-position two-way solenoid valves. Taking the first valve 17 as an example, the two ports of the first valve 17 are connected to the first pump 12 and the outer barrel 14 respectively. When the first valve 17 is placed in the first position, the two ports of the first valve 17 are disconnected, so that the first pump 12 and the outer barrel 14 are disconnected; when the first valve 17 is placed in the second position, the two ports of the first valve 17 are connected, so that the first pump 12 and the outer barrel 14 are connected. The connection of the second valve 19 is similar to that of the first valve 17, and will not be repeated here. The two-position two-way solenoid valve is used, and the structure is simple, and one solenoid valve can realize on-off control. In addition, the solenoid valve can be connected to the controller to facilitate automatic control. In other embodiments, the first valve 17 and the second valve 19 can also use a solenoid valve group equivalent to the two-position two-way solenoid valve.

[0059] In some embodiments, both the first pump 12 and the second pump 15 are magnetic circulation pumps. When the magnetic circulation pumps are not turned on, they can flow in both directions.

[0060] Based on the liquid circuit provided in the above embodiments, the present application also provides an oxygen bomb calorimeter, which includes any one of the liquid circuits in the above embodiments. Since the oxygen bomb calorimeter adopts the liquid circuit in the above embodiments, please refer to the above embodiments for the beneficial effects of the oxygen bomb calorimeter.

[0061] The present application also provides a liquid circuit temperature control method for an oxygen bomb calorimeter, which is used for any of the above liquid circuits, and the method comprises:

[0062] The first pump and the refrigerator are turned on to allow the liquid in the liquid storage tank to circulate in the liquid storage tank self-circulation loop and be cooled to a first set temperature, wherein the first set temperature is lower than room temperature;

[0063] The first valve connects the first pump and the outer barrel. The first pump is turned on to pump the liquid in the liquid storage tank to the outer barrel. When the liquid in the outer barrel reaches a preset amount, the first valve disconnects the first pump and the outer barrel to isolate the outer barrel from the liquid storage tank.

[0064] The heater and the second pump are turned on to make the liquid in the outer barrel circulate in the outer barrel self-circulation loop and be heated to a second set temperature, wherein the second set temperature is higher than the room temperature;

[0065] The first pump is turned on, the first valve disconnects the first pump from the outer barrel, the second valve connects the first pump to the inner barrel, and the first pump pumps a fixed amount of liquid in the liquid storage tank into the inner barrel.

[0066] In this liquid circuit control method, before the test, when it is necessary to cool the liquid in the liquid storage tank, the refrigerator is turned on, and the liquid storage tank self-circulation loop realizes temperature control of the liquid in the liquid storage tank, so that it is reduced to a first set temperature. The first set temperature is lower than the room temperature. Its specific value can be set as needed and is not specifically limited here. Of course, when the temperature of the liquid storage tank meets the first set temperature, the above temperature control step is not required. After the temperature of the liquid storage tank reaches the first set temperature, the first valve connects the liquid storage tank and the outer barrel, and the liquid in the liquid storage tank is pumped to the outer barrel by the first pump. When the liquid in the outer barrel reaches a preset amount, the first valve disconnects the first pump and the outer barrel, thereby disconnecting the liquid storage tank from the outer barrel. Specifically, the preset amount of liquid in the outer barrel can be the amount of liquid in the outer barrel corresponding to the height of the overflow port of the outer barrel, that is, the excess liquid in the outer barrel flows back to the liquid storage tank through the overflow port, so that the liquid in the outer barrel is quantitative. After the outer barrel is filled with liquid, when the liquid in the outer barrel needs to be heated, the heater is turned on, and the outer barrel self-circulation loop controls the temperature of the liquid in the outer barrel, causing it to rise to a second set temperature. The second set temperature is higher than room temperature, and its specific value can be set as needed, and is not specifically limited here.

[0067] After or while the outer barrel is filled with liquid, the inner barrel can be filled with liquid, that is, the second valve connects the liquid storage tank and the inner barrel, and the liquid in the liquid storage tank is pumped to the inner barrel by the first pump, and the liquid level sensor provided in the inner barrel or the measuring cup provided in conjunction with the inner barrel is used to achieve quantitative liquid filling of the inner barrel. After the inner barrel is filled with liquid, the corresponding test can be performed.

[0068] After the test is completed, the liquid in the inner barrel can flow back to the liquid storage tank through the drain valve, and the temperature of the liquid in the liquid storage tank will increase accordingly. If needed, the refrigerator can be turned on and the liquid storage tank self-circulation loop can be used to control the temperature of the liquid in the liquid storage tank, so that it can be lowered to the first set temperature again for the next test.

[0069] By using the liquid circuit temperature control method of the oxygen bomb calorimeter provided by the present application, both the outer barrel and the liquid storage tank can be self-circulating and temperature controlled, that is, the two can realize independent temperature control, and can be controlled at different target temperatures respectively. During the test, the first valve disconnects the connection between the first pump and the outer barrel, that is, the outer barrel is completely isolated from the inner barrel, and the outer barrel does not participate in the liquid storage tank and the inner barrel, realizing the liquid circuit isolation and independent temperature control of the outer barrel, so that it will not affect the test. After the test is completed, the liquid with the increased temperature in the inner barrel only returns to the liquid storage tank, which does not affect the temperature control of the outer barrel, thereby improving the test efficiency. In addition, the liquid circuit structure is simple, and only one refrigerator and one heater are required to realize the independent temperature control of the outer barrel and the liquid storage tank. The first valve and the second valve can cooperate to realize the isolation of the outer barrel, the number of parts is small, and the connection structure is simple, thereby reducing the preparation and maintenance costs. In addition, the first valve can be started and stopped in combination with the first pump to replenish the low-temperature liquid in the liquid storage tank into the outer barrel, or the liquid with a higher temperature in the outer barrel can be replenished into the liquid storage tank to supplement the temperature control capacity of the outer barrel and the liquid storage tank.

[0070] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0071] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A liquid circuit of an oxygen bomb calorimeter, characterized in that: include: A liquid storage tank self-circulating loop comprises a liquid storage tank (11), a first pump (12) and a refrigerator (13), wherein the first pump (12) and the refrigerator (13) are connected between an outlet and an inlet of the liquid storage tank (11), and the refrigerator (13) is used to cool the liquid in the liquid storage tank (11) to below room temperature; The outer barrel self-circulating loop comprises an outer barrel (14), a second pump (15) and a heater (16), wherein the second pump (15) and the heater (16) are connected between an inlet and an outlet of the outer barrel (14), and the heater (16) is used to heat the liquid in the outer barrel (14) to a temperature above room temperature; The outer barrel liquid inlet circuit comprises the first pump (12) and a first valve (17) connected between the first pump (12) and the inlet of the outer barrel (14), wherein the first valve (17) is used to connect or disconnect the first pump (12) and the outer barrel (14), and when the first pump (12) and the outer barrel (14) are connected, the first pump (12) is used to pump the liquid in the liquid storage tank (11) into the outer barrel (14); The inner barrel liquid inlet liquid path is used to add a fixed amount of liquid in the liquid storage tank (11) to the inner barrel (18), and the inner barrel liquid inlet liquid path comprises the inner barrel (18), the first pump (12), and a second valve (19) connected between the first pump (12) and the inlet of the inner barrel (18), wherein the second valve (19) is used to connect or disconnect the first pump (12) and the inner barrel (18), and when the first pump (12) and the inner barrel (18) are connected, the first pump (12) is used to pump the liquid in the liquid storage tank (11) into the inner barrel (18).

2. The liquid circuit of the oxygen bomb calorimeter according to claim 1, characterized in that: The inner barrel liquid inlet path further comprises a third valve (20) and a measuring cup (21), wherein the third valve (20) and the measuring cup (21) are sequentially connected between the first pump (12) and the second valve (19); The first pump (12) is used to pump the liquid in the liquid storage tank (11) to the measuring cup (21) when the second valve (19) disconnects the measuring cup (21) from the inner barrel (18) and the third valve (20) connects the first pump (12) to the measuring cup (21), and the measuring cup (21) is used to measure a fixed amount of the liquid to add to the inner barrel (18).

3. The liquid circuit of the oxygen bomb calorimeter according to claim 2, characterized in that: The height of the measuring cup (21) is higher than the height of the inner barrel (18), so that when the second valve (19) connects the measuring cup (21) and the inner barrel (18), a fixed amount of liquid in the measuring cup (21) flows into the inner barrel (18).

4. The liquid circuit of the oxygen bomb calorimeter according to claim 2, characterized in that: The measuring cup (21) is provided with an overflow port, and the overflow port of the measuring cup (21) is in communication with the liquid storage tank (11).

5. The liquid circuit of the oxygen bomb calorimeter according to claim 1, characterized in that: A liquid level detection device is provided in the inner barrel (18), the liquid level detection device being used to detect the liquid level in the inner barrel (18), and the second valve (19) being used to disconnect the first pump (12) from the inner barrel (18) when the liquid level detection device detects that the liquid level in the inner barrel (18) reaches a preset liquid level.

6. The liquid circuit of the oxygen bomb calorimeter according to any one of claims 1 to 5, characterized in that: The outer barrel (14) is provided with an overflow port, and the overflow port of the outer barrel (14) is in communication with the liquid storage tank (11).

7. The liquid circuit of the oxygen bomb calorimeter according to any one of claims 1 to 5, characterized in that: The inner barrel (18) is provided with a drain valve, the drain valve being connected to the liquid storage tank (11) via a drain pump (22), the drain valve being used to connect or disconnect the inner barrel (18) and the drain pump (22), the drain pump (22) being used to pump the liquid in the inner barrel (18) to the liquid storage tank (11) when the drain valve is opened.

8. The liquid circuit of the oxygen bomb calorimeter according to claim 1, characterized in that: The first valve (17) and the second valve (19) are both normally closed two-position two-way solenoid valves.

9. An oxygen bomb calorimeter, characterized in that Comprising the liquid circuit as described in any one of claims 1-8.

10. A method for controlling the temperature of a liquid circuit of an oxygen bomb calorimeter, used in the liquid circuit according to any one of claims 1 to 8, characterized in that: include: The first pump and the refrigerator are turned on to allow the liquid in the liquid storage tank to circulate in the liquid storage tank self-circulation loop and be cooled to a first set temperature, wherein the first set temperature is lower than room temperature; The first valve connects the first pump and the outer barrel. When the first pump is turned on, the liquid in the liquid storage tank is pumped into the outer barrel. When the liquid in the outer barrel reaches a preset amount, the first valve disconnects the first pump and the outer barrel to isolate the outer barrel from the liquid storage tank. The heater and the second pump are turned on to allow the liquid in the outer barrel to circulate in the outer barrel self-circulation loop and be heated to a second set temperature, wherein the second set temperature is higher than room temperature; The first pump is turned on, the first valve disconnects the first pump from the outer barrel, the second valve connects the first pump to the inner barrel, and the first pump pumps a fixed amount of liquid in the liquid storage tank into the inner barrel.

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