CN213011971U - Integrated liquid nitrogen purification device - Google Patents
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- CN213011971U CN213011971U CN202021528742.9U CN202021528742U CN213011971U CN 213011971 U CN213011971 U CN 213011971U CN 202021528742 U CN202021528742 U CN 202021528742U CN 213011971 U CN213011971 U CN 213011971U
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Abstract
The utility model relates to a liquid nitrogen purification device discloses an integrated form liquid nitrogen purification device, include: the composite container comprises a cold trap, and an inner heat exchanger and an inner container are arranged in an inner cavity of the cold trap; the liquid nitrogen preparation assembly comprises a heating assembly, a filter, an inner heat exchanger and an inner container which are sequentially connected through pipelines; the liquid nitrogen condensation component comprises a cold trap and a vacuum pump which are sequentially connected through a pipeline; the liquid taking cabin is opened and closed through a cabin door, and a liquid discharge pipe connected with the inner container is arranged in the liquid taking cabin. Wherein, the liquid nitrogen preparation subassembly and the liquid nitrogen condensation subassembly are equipped with the liquid nitrogen interface that can be connected with liquid nitrogen storage device respectively. The utility model provides a current liquid nitrogen purification device when the aseptic liquid nitrogen of preparation, need prepare two kinds of raw materialss of aseptic nitrogen gas and liquid nitrogen as the consumptive material, the material is ordered and is managed more troublesome, the higher problem of preparation cost.
Description
Technical Field
The utility model relates to a liquid nitrogen purification device specifically indicates an integrated form liquid nitrogen purification device.
Background
Liquid nitrogen, which refers to nitrogen in liquid form, can be brought into direct contact with biological tissues due to its chemical inertness, and is immediately frozen without destroying its biological activity. Therefore, the liquid nitrogen is used as a refrigerant to rapidly freeze the biological tissue and avoid the biological tissue from being damaged.
Since liquid nitrogen is often used in the biological experiment field, the pharmaceutical field, the food field and other environments, in order to avoid pollution caused by liquid nitrogen, the aseptic requirement on liquid nitrogen in such environments is high, and aseptic liquid nitrogen is often required to be prepared. The working principle of the existing liquid nitrogen purification device (also called aseptic liquid nitrogen machine) for preparing aseptic liquid nitrogen is that the aseptic liquid nitrogen with the pressure of 0.3MPa is obtained by condensing the normal-temperature aseptic nitrogen with the relatively high pressure (0.3MPa) by the liquid nitrogen with the relatively low pressure (0.1MPa) and low temperature. However, this liquid nitrogen purification apparatus does not have a sterilization capability, and actually only connects sterilized nitrogen gas to a condenser for liquefaction, and needs to use two materials of sterilized nitrogen gas and liquid nitrogen as consumables, and the ordering and management of materials are troublesome, and the preparation cost is high.
SUMMERY OF THE UTILITY MODEL
Based on above technical problem, the utility model provides an integrated form liquid nitrogen purification device has solved current liquid nitrogen purification device when preparing aseptic liquid nitrogen, need prepare two kinds of raw materialss of aseptic nitrogen gas and liquid nitrogen as the consumptive material, and the material is ordered and is managed more troublesome, the higher problem of cost of preparation.
For solving the above technical problem, the utility model discloses a technical scheme as follows:
an integrated liquid nitrogen purification device comprising: the composite container comprises a cold trap, and an inner heat exchanger and an inner container are arranged in an inner cavity of the cold trap; the liquid nitrogen preparation assembly comprises a heating assembly, a filter, an inner heat exchanger and an inner container which are sequentially connected through pipelines; the liquid nitrogen condensation component comprises a cold trap and a vacuum pump which are sequentially connected through a pipeline; the liquid taking cabin is opened and closed through a cabin door, and a liquid discharge pipe connected with the inner container is arranged in the liquid taking cabin. Wherein, the liquid nitrogen preparation subassembly and the liquid nitrogen condensation subassembly are equipped with the liquid nitrogen interface that can be connected with liquid nitrogen storage device respectively.
As a preferable mode, the liquid nitrogen preparation component further comprises an external heat exchanger, and the external heat exchanger is arranged between the liquid nitrogen interface and the heating component through a pipeline; the liquid taking cabin is provided with an exhaust pipe, and the exhaust pipe is connected with the outer heat exchanger and used for exchanging heat with low-temperature liquid nitrogen in the outer heat exchanger.
As a preferred mode, the heating assembly comprises a first heater and a second heater which are sequentially connected through a pipeline, the first heater is used for heating the liquid nitrogen into normal-temperature nitrogen, and the second heater is used for heating the nitrogen into high-temperature nitrogen; a pressure reducing valve is arranged on a pipeline between the first heater and the second heater.
As a preferable mode, the composite container further comprises an outer container, the cold trap is arranged in the outer container, and a vacuum interlayer is arranged between the outer container and the cold trap.
As a preferable mode, the composite container, the liquid nitrogen preparation component, the liquid nitrogen condensation component and the liquid taking cabin are integrally arranged in the cabinet body, and a liquid nitrogen interface extends out of the outer shell of the cabinet body; an exhaust port for exhausting waste nitrogen generated by the liquid nitrogen preparation component and the liquid nitrogen condensation component is arranged on the outer side of the cabinet body.
As a preferred mode, the cabinet body is further provided with an air duct penetrating through the cabinet body, one side of the air duct is provided with a fan, and the air duct is used for cooling the electromagnetic valve on the liquid discharge pipe.
As a preferred mode, the intelligent cabinet also comprises a control system, wherein the system comprises a control panel arranged on the cabinet body; the control panel is in signal connection with the composite container, the liquid nitrogen preparation assembly, the liquid nitrogen condensation assembly and the liquid taking cabin.
As a preferable mode, a first temperature sensor for detecting the temperature of the inner container, a second temperature sensor for detecting the temperature of the cold trap, a first liquid level meter for detecting the liquid level of the inner container, a second liquid level meter for detecting the liquid level of the cold trap and a first pressure sensor for detecting the pressure in the cold trap are arranged on the composite container; the top of the inner container is also provided with a second pressure sensor and a safety valve for monitoring the pressure of the inner container; the first temperature sensor, the second temperature sensor, the first liquid level meter, the second liquid level meter, the first pressure sensor, the second pressure sensor and the safety valve are all in signal connection with the control panel.
Preferably, the liquid nitrogen condensation assembly further comprises a third heater, and the third heater is arranged between the cold trap and the vacuum pump through a pipeline.
As a preferred mode, the liquid taking cabin is made of heat-insulating materials.
Compared with the prior art, the beneficial effects of the utility model are that:
(1) the utility model discloses self possesses the ability of making aseptic nitrogen gas, need not insert aseptic nitrogen gas alone, only need insert a liquid nitrogen storage device alright accomplish the preparation of aseptic nitrogen gas. Therefore, the occupied space of the equipment can be effectively reduced, the types of consumables can be reduced, the ordering and management of materials are convenient, and the preparation cost can be reduced.
(2) The utility model discloses a with compound container, liquid nitrogen preparation subassembly, liquid nitrogen condensation subassembly and get the liquid cabin integration and arrange, strengthened liquid nitrogen purification device overall structure's integrated level, make its all kinds of circuits, pipeline built-in, the structure is pleasing to the eye, integrative nature is strong.
(3) The utility model discloses a its control system, intelligent control liquid nitrogen purification device's all kinds of equipment operation still can carry out real-time supervision to the various parameters of device operation, has improved whole liquid nitrogen purification device's automation, intelligent degree, still can strengthen its security.
Drawings
The present application will be further explained by way of exemplary embodiments, which will be described in detail by way of the accompanying drawings, in which:
fig. 1 is a schematic view of an axial measurement structure of the present invention (with the cabinet body shell removed).
Fig. 2 is a schematic view of the axial measurement structure of the present invention (with the cabinet body shell removed).
Fig. 3 is a schematic view of the axial measurement structure of the present invention (with the cabinet body shell removed).
Fig. 4 is a front view of the present invention (with the cabinet housing removed).
Fig. 5 is a left side view of fig. 4.
Fig. 6 is a rear view of fig. 4.
Fig. 7 is a schematic drawing of liquid extraction (with cabinet shell removed).
FIG. 8 is a composite vessel axial schematic view.
Fig. 9 is a schematic view of the internal structure of the composite container.
Fig. 10 is a schematic axial view of the cabinet.
Fig. 11 is a front view of the cabinet.
Fig. 12 is a rear view of the cabinet.
The system comprises a fan 1, a liquid taking cabin 2, a cabin door 201, a composite container 3, a cold trap liquid inlet pipe 301, a second temperature sensor 302, a pressure monitoring interface 303, an internal heat exchanger 304, a first temperature sensor 305, a cold trap liquid outlet pipe 306, a first liquid level meter 307, a second liquid level meter 308, an external container 309, a vacuum interlayer 310, a cold trap 311, an internal container 312, a vacuum pump 4, a heating assembly 5, a first heater 501, a second heater 502, an external heat exchanger 6, a filter 7, a third liquid nitrogen heater 8, an air duct 9, a liquid nitrogen interface 10, an exhaust pipe 11, a liquid outlet pipe 12, an electromagnetic valve 13, a valve rod 1301, a pressure reducing valve 14, a liquid taking container 15, a liquid taking container 16 and a cabinet 1601 exhaust port.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present disclosure more apparent, the technical solutions of the embodiments of the present disclosure will be described clearly and completely with reference to the drawings of the embodiments of the present disclosure. It is to be understood that the described embodiments are only a few embodiments of the present disclosure, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the disclosure without any inventive step, are within the scope of protection of the disclosure.
Unless otherwise defined, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this disclosure belongs. The use of "first," "second," and similar terms in this disclosure is not intended to indicate any order, quantity, or importance, but rather is used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships may also be changed accordingly.
Fig. 1 to 12 are schematic structural views of a liquid nitrogen purification apparatus according to some embodiments of the present application, and the liquid nitrogen purification apparatus according to the present application will be described below with reference to fig. 1 to 12. It should be noted that fig. 1 to 12 are only examples, and the specific shape and structure of the liquid nitrogen purification apparatus are not limited.
Referring to fig. 1 to 12, in the present embodiment, the liquid nitrogen purification apparatus includes a composite container 3, the composite container 3 includes a cold trap 311, and an inner heat exchanger 304 and an inner container 312 are disposed in an inner cavity of the cold trap 311; the liquid nitrogen preparation assembly comprises a heating assembly 5, a filter 7, an inner heat exchanger 304 and an inner container 312 which are sequentially connected through pipelines: the liquid nitrogen condensation component comprises a cold trap 311 and a vacuum pump 4 which are sequentially connected through a pipeline; the liquid taking chamber 2 is opened and closed through the chamber door 201, and a liquid discharge pipe 12 connected to the inner container 312 is provided in the liquid taking chamber 2. Wherein, the liquid nitrogen preparation component and the liquid nitrogen condensation component are respectively provided with a liquid nitrogen interface 10 which can be connected with liquid nitrogen storage equipment.
In the present embodiment, the preparation process of the sterile nitrogen gas is roughly divided into several stages, i.e., high-temperature sterilization, pre-cooling of the composite container 3, filling and cooling of the cold trap 311 with liquid nitrogen, and purification of the liquid nitrogen.
In the high-temperature sterilization process, liquid nitrogen in the liquid nitrogen storage device enters the heating assembly 5 through a pipeline, and the liquid nitrogen is heated into high-temperature nitrogen through the heating assembly 5. Since the heating assembly 5, the filter 7, the inner heat exchanger 304 and the inner container 312 are sequentially connected, high-temperature nitrogen gas sequentially enters the above components and performs a high-temperature sterilization operation on the above components by using the high-temperature characteristics thereof. Finally, the high temperature nitrogen gas is discharged from the discharge pipe 12 into the liquid-taking tank 2.
Specifically, in order to ensure the sterilization effect of the high-temperature nitrogen gas, the heating temperature of the heating assembly 5 for the nitrogen gas is set to 120 ℃, and the sterilization time of the high-temperature nitrogen gas for the inner container 312 is at least 15 min.
Specifically, the liquid nitrogen storage device is a liquid nitrogen tank.
And the hatch 201 of the liquid taking cabin 2 can be closed in the high-temperature sterilization process, so that the whole cabin of the liquid taking cabin 2 is filled with high-temperature nitrogen, and the high-temperature nitrogen can be used for carrying out high-temperature sterilization on the liquid taking cabin 2, thereby ensuring that bacteria in the liquid taking cabin 2 are prevented from polluting sterile liquid nitrogen discharged by the liquid discharge pipe 12 in the subsequent liquid taking operation.
In some embodiments, the liquid extraction chamber 2 is made of a heat insulating material. The heat insulation material can effectively avoid heat loss in the liquid taking cabin 2, prolong the high-temperature state of high-temperature nitrogen and effectively sterilize the liquid taking cabin 2.
In some embodiments, the liquid nitrogen preparation assembly further comprises an external heat exchanger 6, the external heat exchanger 6 being disposed between the liquid nitrogen interface 10 and the heating assembly 5 by a pipeline; the liquid taking chamber 2 is provided with an exhaust pipe 11, and the exhaust pipe 11 is connected with the outer heat exchanger 6 and used for exchanging heat with low-temperature liquid nitrogen in the outer heat exchanger 6.
The exhaust pipe 11 can exhaust high-temperature nitrogen gas generated by the liquid nitrogen preparation component from the liquid taking chamber 2, but if the high-temperature nitrogen gas is directly exhausted, personnel can be scalded. For this purpose, in the present embodiment, an external heat exchanger 6 is added, the external heat exchanger 6 being arranged between the liquid nitrogen storage device and the heating element 5. When high-temperature nitrogen enters the outer heat exchanger 6 from the liquid taking cabin 2 through the exhaust pipe 11, heat exchange can be carried out between the high-temperature nitrogen and low-temperature liquid nitrogen in the outer heat exchanger 6, the high-temperature nitrogen is cooled by the liquid nitrogen and discharged, and personnel can be prevented from being scalded. The liquid nitrogen is heated by the high-temperature nitrogen to be heated and vaporized, so that the load of the heating assembly 5 can be effectively reduced, the electric power consumption is reduced, and the electric energy is saved.
Specifically, the outer heat exchanger 6 may include various heat exchangers such as a jacketed heat exchanger, a dividing wall type heat exchanger, and a shell-and-tube type heat exchanger, which is not limited herein.
The heating assembly 5, the filter 7, the inner heat exchanger 304, the inner container 312 and the liquid taking chamber 2 after the high-temperature sterilization operation are all in a sterile environment. However, the composite container 3 which has just been sterilized at a high temperature is high in temperature and needs to be cooled. The existing liquid nitrogen purification device mainly has two ways of cooling the composite container 3, one way is that the composite container is naturally cooled to normal temperature, and takes about ten hours, and the other way is that the composite container is cooled by liquid nitrogen for about more than ten minutes. In order to ensure the cooling efficiency, in the present embodiment, the composite container 3 is cooled by liquid nitrogen.
The cooling operation of the composite container 3 is divided into two stages, namely a pre-cooling stage of the composite container 3 and a liquid nitrogen filling and cooling stage of the cold trap 311.
In the pre-cooling stage of the composite container 3, a small amount of liquid nitrogen or low-temperature nitrogen in the liquid nitrogen storage device enters the cold trap 311 through a pipeline to reduce the temperature of the composite container 3, and the nitrogen after heat exchange with the composite container 3 is discharged from an outlet of the cold trap 311. And because the heat exchange operation of liquid nitrogen and low temperature nitrogen gas, the risk of frostbite can not be produced to the nitrogen gas temperature that 3 precooling stages of composite container discharged.
After the pre-cooling of the composite container 3 is completed, the cold trap 311 is filled with liquid nitrogen and cooled. And starting the vacuum pump 4, enabling liquid nitrogen in the liquid nitrogen storage device to enter the cold trap 311 through a pipeline, and enabling part of the liquid nitrogen to be vaporized into nitrogen gas due to the heat exchange effect and be pumped out by the vacuum pump 4 and discharged. In the process of filling the cold trap 311 with liquid nitrogen, the vacuum pump 4 continuously discharges the gas in the cold trap 311 to enable the gas to be gradually in a vacuum state, and according to the relationship between the air pressure and the temperature, the temperature of the liquid nitrogen in the vacuum environment is lower than the temperature of atmospheric pressure liquid nitrogen, when the vacuum pumping pressure of the liquid nitrogen in the cold trap 311 is reduced to-0.05 MPa through the vacuum pump 4, the temperature of the liquid nitrogen is about-202 ℃, and ultralow-temperature liquid nitrogen is formed in the cold trap 311.
Specifically, when the pressure of the sterile nitrogen is 0.05MPa, the liquefaction temperature is-192.3 ℃, and the temperature difference between the liquefaction temperature and-202 ℃ of the ultralow-temperature liquid nitrogen is close to 10 ℃, so that the ultralow-temperature liquid nitrogen can fully meet the condensation liquefaction temperature requirement on the sterile nitrogen.
In some embodiments, the liquid nitrogen condensing assembly further comprises a third heater 8, the third heater 8 being disposed between the cold trap 311 and the vacuum pump 4 through a pipeline. The third heater 8 can heat the low-temperature nitrogen gas pumped out from the cold trap 311 by the vacuum pump 4 to normal temperature, so that the nitrogen gas discharged by the vacuum pump 4 cannot cause frostbite.
Specifically, the heating temperature of the third heater 8 is set to 20 ℃.
After the liquid nitrogen in the cold trap 311 is filled, the liquid nitrogen enters a liquid nitrogen purification stage. Liquid nitrogen in the liquid nitrogen storage device enters the heating assembly 5 through a pipeline, the heating assembly 5 heats the liquid nitrogen to normal-temperature nitrogen, and the normal-temperature nitrogen is filtered by the filter 7 to be in a sterile state and then enters the inner container 312 through the inner heat exchanger 304. The sterile nitrogen gas flowing through the inner heat exchanger 304 is condensed and liquefied by the ultra-low temperature liquid nitrogen in the cold trap 311, and flows downwards under the influence of gravity to be accumulated in the inner container 312 until the inner container 312 is filled with the sterile liquid nitrogen without a gas phase space, so that the preparation of the sterile liquid nitrogen is completed.
Specifically, the filter membrane arranged in the filter 7 can adopt a double-layer 0.2-micron hydrophobic polytetrafluoroethylene membrane filter membrane, the filter membrane can completely filter bacteria, viruses and air-lift particle pollutants, and the fold structure of the filter membrane can provide a larger filter membrane area and improve the filtering effect. And the filter membrane material can bear high-temperature steam and cannot be damaged in a high-temperature sterilization stage.
Specifically, interior heat exchanger 304 is the coil structure, and it is long when being long that the interior heat exchanger 304 that is the coil structure can prolong aseptic nitrogen gas condensation, ensures that it can be fully condensed by ultra-low temperature liquid nitrogen.
In some embodiments, the heating assembly 5 includes a first heater 501 and a second heater 502 sequentially connected by a pipeline, the first heater 501 is used for heating the liquid nitrogen into normal-temperature nitrogen gas, and the second heater 502 is used for heating the nitrogen gas into high-temperature nitrogen gas; a pressure reducing valve 14 is provided in a line between the first heater 501 and the second heater 502.
According to the liquid nitrogen characteristic, 1 cubic meter of liquid nitrogen can expand to 696 cubic meter of pure gaseous nitrogen at 21 ℃. In the liquid nitrogen purification stage, if the liquid nitrogen is directly heated and discharged into the filter 7 in a gaseous state, the air pressure passing through the filter 7 is too high, and the air speed is too fast. Too fast a wind speed reduces the diffusion of impurities (brownian motion) in the nitrogen gas, the viscosity of the fluid is reduced, and the contact time with the filter 7 is shortened, resulting in a reduction in the filtering effect.
In addition, as known in the common knowledge, a container matched with equipment and exceeding 0.1MPa is generally a pressure container, the pressure container belongs to special equipment, and installation and use must meet requirements of relevant laws and regulations. And the operation requirement is high, and the operation is carried out by certified professionals.
For this reason, in the present embodiment, a pressure reducing valve 14 is provided on the pipe before the filter 7. The pressure reducing valve 14 is damaged in a low-temperature environment of liquid nitrogen or a high-temperature environment of liquid nitrogen. In this way, the heating unit 5 is provided as a first heater 501 and a second heater 502 connected in line in sequence, and the pressure reducing valve 14 is provided on the line between the first heater 501 and the second heater 502. Therefore, in the high-temperature sterilization stage, the first heater 501 is arranged to heat the liquid nitrogen into normal-temperature nitrogen, the normal-temperature nitrogen is decompressed by the decompression valve 14, and then the second heater 502 is arranged to heat the normal-temperature nitrogen into high-temperature nitrogen for sterilization, so that the decompression valve 14 is prevented from being damaged by low-temperature liquid nitrogen or high-temperature nitrogen. In the liquid nitrogen purification stage, the first heater 501 heats the liquid nitrogen to normal temperature nitrogen, the second heater 502 is closed, and the normal temperature nitrogen is decompressed by the decompression valve 14, purified and filtered by the filter 7, and then enters the inner heat exchanger 304 for condensation and liquefaction.
And the sterile liquid nitrogen prepared from the low-pressure sterile nitrogen gas decompressed by the decompression valve 14 is stored in the inner container 312 in a low-pressure state, the composite container 3 is not required to meet the requirement of a pressure container, the operation is simpler and safer, and the cost of the composite container 3 is lower.
In this embodiment, on the premise of ensuring the normal operation of the heating assembly 5 and the pressure reducing valve 14 in the whole liquid nitrogen purification device, the durability of the pressure reducing valve 14 is effectively ensured, and the service life of the pressure reducing valve is prolonged.
For the receiving and taking of the sterile liquid nitrogen, the hatch door 201 of the liquid taking cabin 2 is opened, the liquid taking container 15 is placed under the liquid discharge pipe 12, the valve of the liquid discharge pipe 12 is opened, and the sterile liquid nitrogen in the inner container 312 is injected into the liquid taking container 15 through the liquid discharge pipe 12 under the action of internal pressure to finish the liquid taking operation.
In the embodiment, since the ultra-low temperature characteristic of the liquid nitrogen in the vacuum environment is utilized to condense the sterile nitrogen, the high-pressure nitrogen is not required to be introduced to raise the liquefaction temperature of the nitrogen to prepare the liquid nitrogen like the conventional liquid nitrogen purification device. The pressure of the liquid nitrogen stored in the inner container 312 prepared by the present embodiment is about 0.1MPa, compared to high pressure liquid nitrogen of 0.3MPa prepared by the existing liquid nitrogen purification apparatus. The liquid nitrogen prepared in the embodiment does not splash like high-pressure liquid nitrogen prepared by the existing liquid nitrogen purification device when the liquid nitrogen is continuously discharged through the liquid discharge pipe 12 due to the characteristic of relatively low pressure, so that personnel frostbite caused by splashing of the liquid nitrogen is effectively avoided.
In some embodiments, referring to fig. 9, composite vessel 3 further comprises outer vessel 309, cold trap 311 disposed within outer vessel 309, and vacuum interlayer 310 disposed between outer vessel 309 and cold trap 311.
The composite container 3 shields the cold trap 311 from the heat convection of the external temperature by using the vacuum interlayer 310 formed between the outer container 309 and the cold trap 311, so that the cold energy in the cold trap 311 cannot leak out as much as possible, thereby the composite container 3 has good heat insulation performance and the vaporization of liquid nitrogen in the cold trap 311 is avoided.
In some embodiments, referring to fig. 10-12, the composite container 3, the liquid nitrogen preparation assembly, the liquid nitrogen condensation assembly, and the liquid extraction chamber 2 are integrally disposed within the cabinet 16, and the liquid nitrogen interface 10 extends from the outer shell of the cabinet 16; an exhaust port 1601 for exhausting waste nitrogen generated by the liquid nitrogen preparation component and the liquid nitrogen condensation component is arranged on the outer side of the cabinet body 16. The cabinet body 16 has the function of integrating the composite container 3, the liquid nitrogen preparation assembly, the liquid nitrogen condensation assembly and the liquid taking cabin 2 together, so that various circuits and pipelines of the cabinet body are built in, the attractiveness of the cabinet body is enhanced, and the occupied area of the cabinet body is reduced.
In addition, according to the prior art and the common general knowledge, in order to control the discharge of the liquid nitrogen storage device, a valve is arranged at the liquid nitrogen interface 10 for controlling the opening and closing of the liquid nitrogen interface 10.
In some embodiments, the cabinet 16 is further provided with an air duct 9 penetrating through the cabinet 16, one side of the air duct 9 is provided with the fan 1, and the air duct 9 is used for cooling the electromagnetic valve 13 on the liquid discharge pipe 12. The electromagnetic valve 13 is arranged on the liquid discharge pipe 12, so that the liquid discharge operation can be automatically controlled, and the automation degree is higher. However, in the high temperature sterilization stage, the discharge pipe 12 discharges high temperature nitrogen gas to avoid the influence of high temperature on the solenoid valve 13. The valve rod 1301 of the electromagnetic valve 13 is cooled by air convection formed by the fan 1 and the air duct 9, so that damage to the valve rod is avoided.
In some embodiments, a control system is also included, the system including a control panel disposed above the cabinet 16; the control panel is in signal connection with the composite container 3, the liquid nitrogen preparation assembly, the liquid nitrogen condensation assembly and the liquid taking cabin 2. The control system intelligently controls the operation of various equipment of the liquid nitrogen purification device, and can also monitor various parameters of the operation of the device in real time, so that the automation and intelligence degree of the whole liquid nitrogen purification device are improved, and the safety of the liquid nitrogen purification device can be enhanced.
Specifically, the control panel further comprises a touch screen, and the touch screen can be used for displaying various parameters and also can be used as an operation panel to control each component.
Specifically, the control panel can control the opening and closing of various electromagnetic valves and equipment on the composite container 3, the liquid nitrogen preparation assembly and the liquid nitrogen condensation assembly to be started and stopped through transmitting control signals, and can set operation parameters of equipment such as the heating assembly 5 and the like, so that the liquid nitrogen purification device can automatically complete preparation of each stage of operation.
Specifically, for a control system, a technician may purchase existing control equipment to implement control functions according to actual needs.
In some embodiments, a first temperature sensor 305 for detecting the temperature of the inner container 312, a second temperature sensor 302 for detecting the temperature of the cold trap 311, a first liquid level meter 307 for detecting the liquid level of the inner container 312, a second liquid level meter 308 for detecting the liquid level of the cold trap 311, and a first pressure sensor for detecting the pressure in the cold trap 311 are arranged above the composite container 3; the top of the inner vessel 312 is also provided with a second pressure sensor and safety valve for monitoring the pressure in the inner vessel 312; the first temperature sensor 305, the second temperature sensor 302, the first liquid level meter 307, the second liquid level meter 308, the pressure sensor, the second pressure sensor and the safety valve are all in signal connection with the control panel.
The first thermometer can detect the temperature of the inner container 312, and in the high-temperature sterilization stage, the first thermometer can detect the temperature of high-temperature nitrogen in the content and judge whether the temperature of the high-temperature nitrogen meets the high-temperature sterilization requirement;
the second thermometer can detect the temperature of the cold trap 311, and at the stage of precooling the composite container 3, the second thermometer can detect the temperature of the cold trap 311, judge whether the cold trap 311 is cooled to normal temperature, and judge whether precooling is completed.
The first liquid level meter 307 can detect the liquid level in the inner container 312, and during the liquid nitrogen purification stage, the first liquid level meter 307 can detect the liquid level of the sterile liquid nitrogen in the inner container 312 to judge whether the sterile liquid nitrogen is full of the inner container 312.
The second level meter 308 can detect the liquid level of the cold trap 311, and at the stages of filling liquid nitrogen and cooling the cold trap 311, the second level meter 308 can detect the liquid level of the ultra-low temperature liquid nitrogen in the cold trap 311 and judge whether the inner container 312 is filled with the ultra-low temperature liquid nitrogen.
The second pressure sensor and the safety valve are used for monitoring the pressure in the inner container 312, ensuring that the pressure in the inner container 312 is in a safe range, and utilizing the safety valve to release the pressure when the pressure in the inner container is overlarge, thereby avoiding safety accidents.
Specifically, a second pressure sensor, a safety valve, is mounted on the inner vessel 312 through a pressure monitoring interface on the inner vessel 312.
Above first temperature sensor 305, second temperature sensor 302, first level gauge 307, second level gauge 308, pressure sensor, second pressure sensor, relief valve all with control panel signal connection, detect it, the real-time feedback of monitoring parameter is to control panel, and control panel controls liquid nitrogen purification device through predetermineeing the procedure again and according to the parameter, and the body has improved whole liquid nitrogen purification device's intelligent degree.
The embodiment of the present invention is the above. The above embodiments and the specific parameters in the embodiments are only for the purpose of clearly showing the verification process of the utility model, and are not used to limit the patent protection scope of the utility model, the patent protection scope of the utility model is still subject to the claims, all the equivalent structural changes made by using the contents of the specification and the drawings of the utility model are included in the protection scope of the utility model.
Claims (10)
1. An integrated liquid nitrogen purification apparatus, comprising:
the composite container (3) comprises a cold trap (311), and an inner heat exchanger (304) and an inner container (312) are arranged in the inner cavity of the cold trap (311);
the liquid nitrogen preparation assembly comprises a heating assembly (5), a filter (7), an inner heat exchanger (304) and an inner container (312) which are sequentially connected through pipelines;
the liquid nitrogen condensation component comprises a cold trap (311) and a vacuum pump (4) which are sequentially connected through a pipeline;
the liquid taking cabin (2) is opened and closed through a cabin door (201), and a liquid discharge pipe (12) connected with the inner container (312) is arranged in the liquid taking cabin (2);
the liquid nitrogen preparation component and the liquid nitrogen condensation component are respectively provided with a liquid nitrogen interface (10) which can be connected with liquid nitrogen storage equipment.
2. The integrated liquid nitrogen purification device according to claim 1, wherein:
the liquid nitrogen preparation assembly further comprises an outer heat exchanger (6), and the outer heat exchanger (6) is connected between the liquid nitrogen connector (10) and the heating assembly (5) through a pipeline;
the liquid taking cabin (2) is provided with an exhaust pipe (11), and the exhaust pipe (11) is connected with the outer heat exchanger (6) and used for exchanging heat with low-temperature liquid nitrogen in the outer heat exchanger (6).
3. The integrated liquid nitrogen purification device according to claim 1, wherein:
the heating assembly (5) comprises a first heater (501) and a second heater (502) which are sequentially connected through a pipeline, the first heater (501) is used for heating liquid nitrogen into normal-temperature nitrogen, and the second heater (502) is used for heating the nitrogen into high-temperature nitrogen;
and a pressure reducing valve (14) is arranged on a pipeline between the first heater (501) and the second heater (502).
4. The integrated liquid nitrogen purification device according to claim 1, wherein:
the composite container (3) further comprises an outer container (309), the cold trap (311) is arranged in the outer container (309), and a vacuum interlayer (310) is arranged between the outer container (309) and the cold trap (311).
5. The integrated liquid nitrogen purification device according to any one of claims 1 to 4, wherein:
the composite container (3), the liquid nitrogen preparation assembly, the liquid nitrogen condensation assembly and the liquid taking cabin (2) are integrally arranged in the cabinet body (16), and the liquid nitrogen interface (10) extends out of the shell of the cabinet body (16);
and an exhaust port (1601) for exhausting waste nitrogen generated by the liquid nitrogen preparation assembly and the liquid nitrogen condensation assembly is arranged on the outer side of the cabinet body (16).
6. The integrated liquid nitrogen purification device according to claim 5, wherein:
still set up wind channel (9) that link up the cabinet body (16) on the cabinet body (16), wind channel (9) one side is equipped with fan (1), wind channel (9) are used for cooling to solenoid valve (13) on fluid-discharge tube (12).
7. The integrated liquid nitrogen purification device according to claim 5, wherein:
the intelligent cabinet also comprises a control system, wherein the system comprises a control panel arranged on the cabinet body (16);
the control panel is in signal connection with the composite container (3), the liquid nitrogen preparation assembly, the liquid nitrogen condensation assembly and the liquid taking cabin (2).
8. The integrated liquid nitrogen purification device according to claim 7, wherein:
a first temperature sensor (305) for detecting the temperature of the inner container (312), a second temperature sensor (302) for detecting the temperature of the cold trap (311), a first liquid level meter (307) for detecting the liquid level of the inner container (312), a second liquid level meter (308) for detecting the liquid level of the cold trap (311) and a first pressure sensor for detecting the pressure in the cold trap (311) are arranged on the composite container (3);
the top of the inner container (312) is also provided with a second pressure sensor and a safety valve for monitoring the pressure of the inner container (312);
the first temperature sensor (305), the second temperature sensor (302), the first liquid level meter (307), the second liquid level meter (308), the first pressure sensor, the second pressure sensor and the safety valve are in signal connection with the control panel.
9. The integrated liquid nitrogen purification device according to any one of claims 1 to 4, wherein:
the liquid nitrogen condensation assembly further comprises a third heater (8), and the third heater (8) is connected between the cold trap (311) and the vacuum pump (4) through a pipeline.
10. The integrated liquid nitrogen purification device according to any one of claims 1 to 4, wherein:
the liquid taking cabin (2) is made of heat insulation materials.
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| CN111874879A (en) * | 2020-07-29 | 2020-11-03 | 四川海盛杰低温科技有限公司 | Integrated liquid nitrogen purification device |
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Address after: 611130 east section of Kesheng Road, Strait Science Park, Wenjiang District, Chengdu City, Sichuan Province Patentee after: Haier Biomedical Technology (Chengdu) Co.,Ltd. Address before: 611130 east section of Kesheng Road, Strait Science Park, Wenjiang District, Chengdu City, Sichuan Province Patentee before: SICHUAN HAISHENGJIE CRYOGENIC TECHNOLOGY CO.,LTD. |