Oxygen bomb calorimeter, liquid circuit and liquid circuit temperature control method thereof

Abstract

The application relates to the technical field of heat quantity detection, and particularly discloses an oxygen bomb calorimeter, a liquid path thereof 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. The first pump and the refrigerator are connected between the outlet and the 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 is used for connecting or disconnecting the first pump and the outer barrel. The second valve is connected between the first pump and the inlet of the inner barrel, and is used for connecting or disconnecting the first pump and the inner barrel. The liquid path and the liquid path temperature control method of the oxygen bomb calorimeter can realize self-circulation temperature control of the outer barrel and the liquid storage tank, and the outer barrel and the liquid storage tank can be controlled at different target temperatures respectively. During the test, the outer barrel does not participate in the test of the liquid storage tank and the inner barrel, and the test efficiency is improved. In addition, the liquid path structure is simple, and the number of parts is small.

Description

Technical Field

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

[0002] An oxygen bomb calorimeter is an instrument used to determine the calorific value of a substance that can be completely burned in high-pressure oxygen. There are several types, including fully automatic oxygen bomb calorimeters, oxygen bomb calorimeters, and oxygen bomb calorimeters. Each uses oxygen as a combustion aid and measures the heat released during complete combustion in high-pressure oxygen to assess the calorific value of a substance.

[0003] A typical bomb calorimeter consists of a water tank, nested inner and outer drums, using water as the medium. The oxygen bomb (a sealed container resistant to high temperatures, pressures, and corrosion) is immersed within the water. The heat of combustion in the bomb is determined by measuring changes in water temperature. The inner drum's water volume must be consistent between tests and replaced after each test to ensure a consistent water temperature between tests. The outer drum is typically a closed water jacket, using water as the medium for temperature control, either maintaining a constant temperature during testing (isothermal method) or varying with the temperature of the inner drum (adiabatic method). The outer drum's water is typically self-circulating and equipped with heating and cooling components for temperature control. The circulating water is sealed, except for replenishment when the outer drum is empty or short of water.

[0004] The water tank is the water storage unit of the oxygen bomb calorimeter and is generally open to the atmosphere. Since the water in the inner barrel needs to be replaced with each test, and the temperature of the water in the inner barrel rises after testing, the water tank should be equipped with self-circulation and heating and cooling temperature control functions to increase testing speed and efficiency. In addition, the water tank can be connected to the outer barrel through corresponding water pipes, water pumps, and valves to realize water filling and 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 water filling, drainage, and quantitative measurement of the inner barrel.

[0005] In the process of implementing this application, the inventors discovered that the prior art has at least the following problems:

[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 is completed, 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 this 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-circulating loop includes a liquid storage tank, a first pump, and a refrigerator, wherein the first pump and the refrigerator are connected between the outlet and the 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] an outer barrel self-circulating loop, comprising 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 circuit includes 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 path is used to add a fixed amount of liquid in the liquid storage tank into the inner barrel. The inner barrel liquid inlet liquid path 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, and 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 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 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, and 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-mentioned liquid circuits, comprising:

[0024] The first pump and the refrigerator are turned on to circulate the liquid in the liquid storage tank 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, thereby isolating the outer barrel from the liquid storage tank.

[0026] The heater and the second pump are turned on to circulate the liquid in the outer barrel 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] The oxygen bomb calorimeter and its liquid circuit and liquid circuit temperature control method provided in this application enable self-circulating temperature control of both the outer barrel and the liquid storage tank through the provision of a temperature-control liquid circuit. This means that both can achieve independent temperature control and can be controlled at different target temperatures. During testing, the first valve disconnects the first pump from the outer barrel, completely isolating the outer barrel from the inner barrel. The outer barrel does not participate in the liquid storage tank and the inner barrel, achieving liquid circuit isolation and independent temperature control of the outer barrel, thus not affecting the test. After the test is completed, the heated liquid in the inner barrel returns only to the liquid storage tank, without affecting the temperature control of the outer barrel, thereby improving test efficiency. Furthermore, the liquid circuit structure is simple, requiring only a cooler and a heater to achieve independent temperature control of the outer barrel and the liquid storage tank. The first valve and the second valve cooperate to achieve isolation of the outer barrel, resulting in a small number of parts and a simple connection structure, thereby reducing 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] To achieve the above objectives, the present application further provides an oxygen bomb calorimeter, which includes any of the above-mentioned fluid circuits. Since the above-mentioned fluid circuits have the above-mentioned technical effects, the oxygen bomb calorimeter having the fluid circuits 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 following briefly introduces the drawings required for use in the embodiments or the description of the prior art. 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 any creative work.

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

[0032] Figure 2 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 the 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-return 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 embodiments of the present application disclose an oxygen bomb calorimeter, a liquid circuit thereof, and a liquid circuit temperature control method, 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 this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0040] Figure 1 The figure shows the fluid circuit of a calorimeter. Two normally open solenoid valves are installed in the pipeline connecting the liquid reservoir 013 and the outer barrel 011. The liquid reservoir 013 has a self-circulating temperature control function, ensuring that the water temperature in the outer barrel 011 and the liquid reservoir 013 is consistent and constant. During testing, 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 reservoir 013 flows through the inline pump 017 and the inner barrel liquid inlet valve 015 into the inner barrel 012. When the liquid level in the inner barrel 012 reaches a predetermined level, the inner barrel liquid inlet valve 015 is closed, and the return valve 016 is opened (closed), resuming the water circulation between the outer barrel 011 and the liquid reservoir 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 drawbacks: Outer barrel 011 and liquid storage tank 013 are in continuous, synchronized temperature control most of the time. During each test, liquid from outer barrel 011 flows into inner barrel 012, resulting in a non-independent liquid path in outer barrel 011. During testing, the liquid (high-temperature liquid) from inner barrel 012, after testing, enters liquid storage tank 013 and outer barrel 011, making it difficult for outer barrel 011 to quickly return to its original temperature and stabilize. This negatively impacts outer barrel 011's temperature-regulating performance and testing efficiency.

[0042] Figure 2Another calorimeter fluid circuit is shown. Liquid reservoir 013 is equipped with a circulating pump 018 for self-circulating temperature control and is connected to a heater 020 and a refrigerator 019. Outer barrel 011 also has a circulating pump 018 for independent self-circulating temperature control and is also connected to a heater 020 and a refrigerator 019. When water is flowing into outer barrel 011, the inlet pump and outer barrel valve are opened to allow water to flow into the outer barrel 011. During testing, the inlet pump and inner barrel valve are opened, and when the liquid level in inner barrel 012 reaches a predetermined level, the inner barrel valve is closed. After the test is completed, the liquid in inner barrel 012 is drained back into liquid reservoir 013 via the inner barrel drain valve and diaphragm pump. During testing, outer barrel 011 in this fluid circuit does not exchange liquid with either inner barrel 012 or liquid reservoir 013, completely isolating the fluid circuit between outer barrel 011 and liquid reservoir 013.

[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 solenoid valves and liquid pumps used is also relatively large. That is, the components used in the liquid circuit are many, making the liquid circuit complex and costly.

[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 embodiments, the present application provides a liquid circuit for an oxygen bomb calorimeter, comprising a self-circulating loop of a liquid storage tank 11, a self-circulating loop of an outer barrel, a liquid inlet circuit for the outer barrel, and a liquid inlet circuit for the inner barrel. The self-circulating loop of the liquid storage tank 11 comprises 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. 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 sequentially connected between the outlet and the inlet of the liquid storage tank 11. When the first pump 12 is activated, the liquid in the liquid storage tank 11 can be discharged through the outlet of the liquid storage tank 11, flow through the refrigerator 13, and then flow back to the liquid storage tank 11 through the inlet of the liquid storage tank 11, thereby circulating the liquid within the self-circulating loop of the liquid storage tank 11, cooling the liquid in the self-circulating loop of the liquid storage tank 11, and thus controlling the temperature of the liquid in the liquid storage tank 11. The refrigerator 13 cools the liquid in the liquid storage tank 11 to below room temperature, that is, the target set temperature of the liquid storage tank 11 is lower than room temperature, eliminating the need for heating during the temperature control process. In some cases, if it is necessary to increase the temperature of the liquid in the liquid storage tank 11, the first valve 17 can be opened, the first pump 12 can be activated, and the higher temperature liquid in the outer barrel 14 can be 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 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 then flow through the heater 16 and return to the outer barrel 14 through the liquid inlet of the outer barrel 14, thereby realizing 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 circuit 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 into the outer barrel 14. The outer barrel liquid inlet circuit 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 connected to the first valve 17 and the inlet of the refrigerator 13, respectively. When the first pump 12 is started and the first valve 17 is opened, 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, isolating the liquid in the outer barrel 14 from the liquid in the liquid storage tank 11. At this time, the second pump 15 and heater 16 can be turned on, and the outer barrel 14 can be self-circulated to control the temperature, thereby heating the temperature of the liquid in the outer barrel 14 to a temperature higher than room temperature. In other words, 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 temperature of the outer barrel 14 needs to be lowered, the first valve 17 can be opened, and the first pump 12 can be started to pump the lower temperature liquid 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 circuit is used to add a fixed amount of liquid from the liquid storage tank 11 to the inner barrel 18. The inner barrel liquid inlet liquid circuit 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 from the liquid storage tank 11 to the inner barrel 18. The inner barrel liquid inlet liquid circuit 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 to the outer barrel 14, and the liquid inlet to 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 connected to the first valve 17, the second valve 19, and the inlet of the refrigerator 13, respectively. During the test, the first pump 12 is started and the second valve 19 is opened, allowing the liquid in the liquid storage tank 11 to 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 drained and refilled for the next measurement.

[0049] The fluid circuit of the oxygen bomb calorimeter provided in this application, through the provision of a temperature-controlled fluid circuit, enables self-circulating temperature control for both the outer barrel 14 and the liquid storage tank 11. This means that both can achieve independent temperature control and can be controlled at different target temperatures. During testing, the first valve 17 disconnects the first pump 12 from the outer barrel 14, completely isolating the outer barrel 14 from the inner barrel 18. The outer barrel 14 is not involved in the liquid storage tank 11 or the inner barrel 18, achieving fluid circuit isolation and independent temperature control for the outer barrel 14, thus preventing any impact on the test. After the test is completed, the heated liquid in the inner barrel 18 returns solely to the liquid storage tank 11, without affecting the temperature control of the outer barrel 14 and improving testing efficiency. Furthermore, the fluid circuit structure is simple, requiring only a cooler 13 and a heater 16 to achieve independent temperature control for each of the outer barrel 14 and the liquid storage tank 11. The first valve 17 and the second valve 19 cooperate to isolate the outer barrel 14, resulting in a small number of components and a simple connection structure, thereby reducing manufacturing 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 temperature of the outer barrel 14 can be set to a target temperature slightly higher than the ambient temperature according to standard requirements. The temperature is controlled by a heater 16 connected in series to the outer barrel's self-circulation loop. 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 temperature of the liquid storage tank 11 can be set to a target temperature slightly lower than or approximately equal to the ambient temperature according to standard requirements. The temperature is controlled by a cooler 13 connected in series to the liquid storage tank 11's self-circulation loop. 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 liquid is added to the inner barrel 18, the amount of liquid in the inner barrel 18 must be controlled, i.e., the inner barrel 18 is quantitatively filled. Specifically, quantitative filling can be achieved by using a measuring cup 21 or by providing a liquid level detection device within the inner barrel 18. When using the measuring cup 21, the liquid in the inner barrel 18 can be introduced by the liquid in the liquid storage tank 11 passing through the measuring cup 21. When using a liquid level detection device, the liquid in the liquid storage tank 11 can be introduced directly into the inner barrel 18. The following describes two embodiments as examples.

[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, which are sequentially connected between the first pump 12 and the second valve 19. Specifically, a third valve 20 and a measuring cup 21 are further provided in the pipeline of the inner barrel liquid inlet liquid circuit. 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. The measuring cup 21 is used to measure a certain amount of liquid to add to the inner barrel 18. Specifically, during testing, the first pump 12 and the third valve 20 are first opened. The first pump 12 pumps the liquid in the liquid storage tank 11 to the measuring cup 21, i.e., the measuring cup 21 is filled with liquid. The measuring cup 21 is used to measure a fixed amount of liquid to be added to the inner barrel 18. That is, when the liquid in the measuring cup 21 reaches the target amount, the third valve 20 is closed, and the second valve 19 is opened, allowing the liquid in the measuring cup 21 to flow 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 can be controlled 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 that of the inner barrel 18, so that when the second valve 19 connects the measuring cup 21 to the inner barrel 18, a fixed amount of liquid in the measuring cup 21 flows into the inner barrel 18. By placing the measuring cup 21 above the inner barrel 18, when the second valve 19 is opened to connect the measuring cup 21 to 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. With this arrangement, the liquid in the measuring cup 21 can be injected into the inner barrel 18 without the need for a power component. In other embodiments, a liquid pump can also be installed between the measuring cup 21 and the inner barrel 18 to pump the liquid in the measuring cup 21 into the inner barrel 18.

[0054] In some embodiments, the measuring cup 21 is provided with an overflow port, which is connected to the liquid storage tank 11. During testing, the third valve 20 is opened, allowing the liquid in the liquid storage tank 11 to flow into the measuring cup 21 until it is full, with the excess liquid overflowing back into the liquid storage tank 11. Simultaneously, the first valve 17 can be controlled to open, allowing the liquid in the liquid storage tank 11 to flow into the outer barrel 14, keeping the outer barrel 14 full. The overflow port in the measuring cup 21 allows quantitative control of the amount of liquid in the measuring cup 21 to be added directly by overflowing the corresponding amount.

[0055] See also Figure 4 In other embodiments, quantitative liquid inflow is achieved by providing a liquid level detection device within the inner barrel 18. Unlike the aforementioned method of achieving quantitative liquid inflow using a measuring cup 21, this embodiment does not require a measuring cup 21 within the inner barrel inflow path. Instead, a liquid level detection device is provided within the inner barrel 18 to detect the liquid level within the inner barrel 18. The second valve 19 is used to disconnect the first pump 12 from the inner barrel 18 when the liquid level detection device detects that the liquid level within the inner barrel 18 has reached a preset level. In other words, by providing the liquid level detection device, the liquid level within the inner barrel 18 can be detected. When the liquid level reaches the preset level, indicating that the amount of liquid within the inner barrel 18 has reached the corresponding quantitative level, the second valve 19 can be closed, stopping liquid inflow. The provision of the liquid level detection device further simplifies the structure of the inner barrel inflow path. Specifically, the liquid level detection device can be implemented as 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 providing an 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 to fill the outer barrel 14 with liquid. After 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. No other valves are provided for the outer barrel 14 to be filled 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 via a drain pump 22. The drain valve is used to connect or disconnect the inner barrel 18 from 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. By providing a drain valve in the inner barrel 18 and cooperating with the drain pump 22 to drain the inner barrel 18, after the test is completed, the drain pump 22 can be turned on and the drain valve 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's self-circulating loop to meet the requirements of the next test. Specifically, the drain pump 22 can be a diaphragm pump, that is, when the diaphragm pump is not turned on, the liquid cannot flow. After the diaphragm pump is turned on, the liquid can flow from the inner barrel 18 to the liquid storage tank 11.

[0058] In some embodiments, both the first valve 17 and the second valve 19 are two-position, two-way solenoid valves, specifically, 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 in the first position, the two ports of the first valve 17 are disconnected, thereby disconnecting the first pump 12 and the outer barrel 14. When the first valve 17 is in the second position, the two ports of the first valve 17 are connected, thereby connecting the first pump 12 and the outer barrel 14. The connection of the second valve 19 is similar to that of the first valve 17 and will not be further described here. Using a two-position, two-way solenoid valve offers a simple structure, allowing a single solenoid valve to achieve on-off control. Furthermore, the solenoid valve can be connected to a controller for automated control. In other embodiments, the first valve 17 and the second valve 19 may also be a solenoid valve assembly equivalent to a two-position, two-way solenoid valve.

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

[0060] Based on the liquid circuits provided in the above embodiments, the present application further 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 circuits in the above embodiments, the beneficial effects of the oxygen bomb calorimeter can be referred to the above embodiments.

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

[0062] The first pump and the refrigerator are turned on to circulate the liquid in the liquid storage tank 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. 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.

[0064] The heater and the second pump are turned on to circulate the liquid in the outer barrel 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;

[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 testing, when it is necessary to cool the liquid in the liquid storage tank, the refrigerator is turned on, and the liquid storage tank's self-circulation loop controls the temperature of the liquid in the liquid storage tank, lowering it to a first set temperature. The first set temperature is lower than room temperature, and 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-mentioned 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 into 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 from 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 outer barrel's overflow port, that is, the excess liquid in the outer barrel flows back into the liquid storage tank through the overflow port, so that the liquid in the outer barrel is quantified. 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 the room temperature, and its specific value can be set as needed, and is not specifically limited here.

[0067] After or simultaneously with the outer barrel filling, the inner barrel can be filled. Specifically, the second valve connects the liquid reservoir and the inner barrel, and the first pump pumps the liquid from the reservoir into the inner barrel. A level sensor or a measuring cup provided inside the inner barrel ensures a quantitative amount of liquid is added to the inner barrel. Once the inner barrel is filled, testing can begin.

[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] The fluid circuit temperature control method for an oxygen bomb calorimeter provided in this application enables self-circulating temperature control for both the outer barrel and the liquid storage tank. This means both can be independently temperature-controlled and controlled at different target temperatures. During testing, a first valve disconnects the first pump from the outer barrel, completely isolating the outer barrel from the inner barrel and preventing it from participating in the liquid storage tank or inner barrel. This achieves fluid circuit isolation and independent temperature control for the outer barrel, thus preventing any impact on the test. After the test, the heated liquid in the inner barrel returns solely to the liquid storage tank, without affecting the outer barrel's temperature control, thus improving testing efficiency. Furthermore, the fluid circuit structure is simple, requiring only a cooler and a heater to achieve independent temperature control for the outer barrel and the liquid storage tank. The first and second valves work together to isolate the outer barrel, resulting in a small number of components and a simple connection structure, reducing manufacturing and maintenance costs. Furthermore, the first valve can be activated and deactivated in conjunction with the first pump to replenish low-temperature liquid from the liquid storage tank into the outer barrel, or to replenish higher-temperature liquid from the outer barrel into the liquid storage tank, thereby enhancing the temperature control capabilities of both 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 is intended to enable one skilled in the art to implement or use the present application. Various modifications to these embodiments will be readily apparent to one 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 is not limited to the embodiments shown herein, but is intended to 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-circulation 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 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) is connected to the outer barrel (14), the first pump (12) is used to pump the liquid in the liquid storage tank (11) into the outer barrel (14); an inner barrel liquid inlet circuit for adding a fixed amount of liquid in the liquid storage tank (11) to the inner barrel (18); the inner barrel liquid inlet circuit comprising 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); the second valve (19) being used to connect or disconnect the first pump (12) and the inner barrel (18); and 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) into the inner barrel (18); 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) into 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). The measuring cup (21) is used to measure a fixed amount of the liquid to be added to the inner barrel (18).

2. The liquid circuit of the oxygen bomb calorimeter according to claim 1, 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).

3. The liquid circuit of the oxygen bomb calorimeter according to claim 1, 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).

4. 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), and 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) 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.

5. The liquid circuit of the oxygen bomb calorimeter according to any one of claims 1 to 4, 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).

6. The liquid circuit of the oxygen bomb calorimeter according to any one of claims 1 to 4, characterized in that: The inner barrel (18) is provided with a drain valve, which is connected to the liquid storage tank (11) via 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.

7. 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.

8. An oxygen bomb calorimeter, characterized in that Comprising the liquid circuit according to any one of claims 1 to 7.

9. 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 7, characterized in that: include: The first pump and the refrigerator are turned on to circulate the liquid in the liquid storage tank 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, thereby isolating the outer barrel from the liquid storage tank. The heater and the second pump are turned on to circulate the liquid in the outer barrel 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.

Images