A special delivery pump for liquid carbon dioxide with a visible pre-cooling chamber

Abstract

The present invention discloses a liquid carbon dioxide delivery pump with a visible pre-cooling chamber, comprising a delivery pump housing, one side of the delivery pump housing is respectively provided with a delivery pump housing through-plate high-pressure joint and a recovery inlet through-plate joint, the input end of the delivery pump housing through-plate high-pressure joint is provided with a second filter, the input end of the second filter is provided with a first filter, the input end of the first filter is provided with a liquid carbon dioxide storage container, and a pre-cooling chamber is provided on one side of the front end of the delivery pump housing. The present invention provides the temperature and space required for liquefaction under the corresponding carbon dioxide gas pressure through a pre-cooling chamber with a self-tightening sealed high-pressure resistant window, so that liquid carbon dioxide can be effectively supplemented for delivery after entering the pump head; the pre-cooling chamber structure can effectively prevent the pump head, pump body and internal sealing structure from being too cold and frosting and condensing, destroying the sealing structure and even damaging the equipment circuit.

Description

Technical Field

[0001] The invention relates to the technical field of laboratory instruments and equipment, in particular to a special liquid carbon dioxide delivery pump with a visible pre-cooling cavity. Background Art

[0002] Liquid carbon dioxide is widely used in various fields, especially in scenarios with high-pressure application requirements. Since carbon dioxide is easy to vaporize and gas medium diaphragm pumps are difficult to meet high-precision flow rate control, high pressure, and high-stability delivery, most of them use liquid delivery pumps. In the past, the delivery of liquid carbon dioxide mostly used a crankshaft connecting rod mechanism to drive a plunger pump or a piston pump to achieve the delivery of carbon dioxide. However, this method has a high linear speed and low efficiency. This is because vaporization will inevitably occur during the operation of the plunger pump or the piston pump. The pump head cavity is small. When the delivery flow rate is too fast, the liquid in the cavity will be delivered quickly, so that the subsequent gas liquefaction speed cannot reach the delivery flow rate, so it cannot be delivered continuously and stably, which will also cause the pump body to be unstable, the failure rate is high, and the service life of the pump body will be shortened.

[0003] The defects of the current delivery pump:

[0004] The semiconductor refrigeration used in conventional carbon dioxide reciprocating pumps has problems such as high failure rate and short service life; the cold water bath refrigeration used has problems such as complicated equipment, high cost, and occupying too much experimental space; and both of the above refrigeration methods require direct cooling of the pump head, and condensation and frost will occur on the pump head and sealing structure during use, resulting in a large amount of condensed water, causing damage to the equipment;

[0005] 1. Conventional carbon dioxide reciprocating pumps or booster pumps have a small inner volume of the pump head. When the flow rate is too high, the carbon dioxide will not be liquefied in time, which will cause the delivery to be interrupted, the pressurization to be slow, or even the pressurization to fail. Conventional carbon dioxide delivery pumps are all controlled by old-fashioned membrane buttons, which have a single function and the button panel will fail or be damaged after long-term use.

[0006] 2. Conventional carbon dioxide delivery pumps only have a constant flow delivery and pressurization mode, which cannot meet the application scenarios that require constant pressure. This is an obvious control function defect of most current delivery pumps. Conventional carbon dioxide delivery pumps do not have a recycling and reuse function structure. Summary of the invention

[0007] The object of the present invention is to provide a special liquid carbon dioxide delivery pump with a visible pre-cooling chamber to solve the related problems raised in the above background technology.

[0008] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a liquid carbon dioxide dedicated delivery pump with a visible pre-cooling chamber, comprising a delivery pump housing, one side of the delivery pump housing is respectively provided with a delivery pump housing through-plate high-pressure joint and a recovery inlet through-plate joint, the input end of the delivery pump housing through-plate high-pressure joint is provided with a second filter, the input end of the second filter is provided with a first filter, the input end of the first filter is provided with a liquid carbon dioxide storage container, a pre-cooling chamber is provided on one side of the front end of the delivery pump housing, and a self-tightening sealing type is provided at the front end of the delivery pump housing. A high-pressure resistant window, purification components and output ports are respectively arranged on both sides of the back of the pre-cooling chamber, a delivery pump is arranged at the output end of the output port, a pressure sensor is arranged at the output end of the delivery pump, an output end high-precision filter is arranged at the output end of the pressure sensor, a control circuit is arranged at one end of the back of the delivery pump housing, the interface of the control circuit is connected with a connecting line, a high-definition touch display is arranged on the side of the front end of the delivery pump housing away from the pre-cooling chamber, and an output end through-plate connector is arranged on the side of the delivery pump housing away from the through-plate high-pressure connector of the delivery pump housing.

[0009] Preferably, the delivery pump comprises a high-pressure output port and a pump head inlet end, the input end of the pump head inlet end is interconnected with the output end of the output port, the output end of the delivery pump is provided with a high-pressure output port, and the output end of the high-pressure output port is interconnected with the pressure sensor.

[0010] Preferably, the pre-cooling chamber is a pre-cooling chamber assembly including a refrigeration system, with a diaphragm compressor refrigeration system and a point light source.

[0011] Preferably, the output end of the output through-plate connector is connected to a supercritical carbon dioxide dryer.

[0012] Preferably, the main structure of the control circuit is composed of a single-chip microcomputer main control program and a control board, the control circuit is connected to a high-definition touch screen via serial port communication, and the control circuit displays a control interface via an HMI high-definition line.

[0013] Preferably, the control circuit is electrically connected to the pressure sensor, the delivery pump and the high-definition touch display screen through wires.

[0014] Preferably, the filtering precisions of the first filter and the second filter are 2 mm and 0.5 mm respectively.

[0015] Preferably, the interior of the delivery pump housing is provided with multiple safety protection measures: upper pressure limit alarm, overpressure alarm, alarm automatic stop and shut-off, and high-pressure unloading protection.

[0016] Preferably, the pre-cooling chamber is cooled by a film compressor and adopts a fully automatic PID temperature control system.

[0017] Preferably, the output end of the recovery inlet through-plate connector is interconnected with the purification component.

[0018] Compared with the prior art, the present invention provides a special liquid carbon dioxide delivery pump with a visible pre-cooling chamber, which has the following beneficial effects:

[0019] 1. The present invention provides the temperature and space required for liquefaction under the corresponding carbon dioxide gas pressure through a pre-cooling chamber with a self-tightening sealed high-pressure resistant window, so that the liquid carbon dioxide can be effectively supplemented and supplied after entering the pump head; the pre-cooling chamber structure can effectively prevent the pump head, pump body and internal sealing structure from frosting and condensing due to excessively low temperatures, destroying the sealing structure and even damaging the equipment circuit;

[0020] 2. The present invention utilizes a high-definition touch serial port screen combined with a single-chip mainboard control program for the delivery pump, making the control logic more concise and centralized, and making the operability and human-computer interaction easier and more comfortable, greatly improving the use efficiency. The pre-cooling chamber adopts a film compressor for refrigeration, which has a compact structure, low power, and greatly prolonged service life. In addition, it adopts a fully automatic PID temperature control system, which can automatically adjust and control the constant refrigeration temperature without human intervention;

[0021] 3. The present invention adds a constant pressure output control function on the basis of the conventional constant current function mode through the detection of the pressure sensor and the control of the control circuit to meet more scenarios requiring constant pressure. At the same time, it can be directly applied to constant pressure extraction and drying experimental samples in the supercritical extraction drying method. The delivery pump adds a constant pressure output control function on the basis of the conventional constant current function mode to meet more scenarios requiring constant pressure. At the same time, through the cooperation of the purification component and the recovery inlet through-plate joint, a complete purification and recovery structure is formed, so that carbon dioxide can be effectively reused, waste can be reduced, and energy conservation and environmental protection can be achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the structure of the integral delivery pump of the present invention;

[0023] Figure 2 It is a schematic diagram of the structure of the delivery pump of the present invention.

[0024] In the figure: 1. Liquid carbon dioxide storage container; 2. First filter; 3. Second filter; 4. Delivery pump housing through-plate high-pressure connector; 5. Self-tightening sealed high-pressure resistant window; 6. Pre-cooling chamber; 7. Purification component; 8. Recovery inlet through-plate connector; 9. Delivery pump; 10. Pump head inlet; 11. High-pressure output port; 12. Pressure sensor; 13. Control circuit; 14. Connecting wire; 15. High-definition touch screen; 16. High-precision filter at the output end; 17. Output through-plate connector; 18. Delivery pump housing; 19. Output port. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] See also Figure 1-2 The present invention provides a technical solution: a liquid carbon dioxide dedicated delivery pump with a visible pre-cooling chamber, comprising a delivery pump housing 18, a delivery pump housing through-plate high-pressure joint 4 and a recovery inlet through-plate joint 8 are respectively arranged on one side of the delivery pump housing 18, a second filter 3 is arranged at the input end of the delivery pump housing through-plate high-pressure joint 4, a first filter 2 is arranged at the input end of the second filter 3, a liquid carbon dioxide storage container 1 is arranged at the input end of the first filter 2, a pre-cooling chamber 6 is arranged on one side of the front end of the delivery pump housing 18, a self-tightening sealing high-pressure resistant window 5 is arranged at the front end of the delivery pump housing 18, and the pre-cooling chamber 6 are respectively provided with purification components 7 and output ports 19, the output end of the output port 19 is provided with a delivery pump 9, the output end of the delivery pump 9 is provided with a pressure sensor 12, the output end of the pressure sensor 12 is provided with an output end high-precision filter 16, and the output end high-precision filter 16 is provided with a control circuit 13 at one end of the back of the delivery pump housing 18, and the interface of the control circuit 13 is connected with a connecting line 14, a high-definition touch display screen 15 is provided on the side of the front end of the delivery pump housing 18 away from the pre-cooling chamber 6, and an output end through-plate connector 17 is provided on the side of the delivery pump housing 18 away from the delivery pump housing through-plate high-pressure connector 4.

[0027] As a preferred solution of this embodiment: the delivery pump 9 includes a high-pressure output port 11 and a pump head inlet end 10, the input end of the pump head inlet end 10 is interconnected with the output end of the output port 19, and the output end of the delivery pump 9 is provided with a high-pressure output port 11, and the output end of the high-pressure output port 11 is interconnected with the pressure sensor 12, so that the delivered carbon dioxide can be pressurized.

[0028] As a preferred solution of this embodiment: the pre-cooling chamber 6 is a pre-cooling chamber assembly including a refrigeration system, with a diaphragm compressor refrigeration system and a point light source, wherein the compressor refrigeration system provides the low temperature required for the liquefaction of high-pressure carbon dioxide for the pre-cooling chamber, and adopts a high-precision PID automatic temperature control system; the point light source is used to illuminate the interior of the pre-cooling chamber, so that the user can clearly observe the actual liquid level of the liquid carbon dioxide in the pre-cooling chamber through the window, so as to ensure that the pre-cooling temperature can meet the liquid supply at the corresponding flow rate of the pump body.

[0029] As a preferred solution of this embodiment: the output end of the output through-plate connector 17 is connected to a supercritical carbon dioxide dryer to detect carbon dioxide.

[0030] As the preferred solution of this embodiment: the main structure of the control circuit 13 is composed of a single-chip main control program and a control board. The control circuit 13 is connected to the high-definition touch screen 15 through serial port communication. The control circuit 13 displays the control interface through the HMI high-definition line, high-definition touch, and the interactive software is simple and easy to operate, providing a better user experience.

[0031] As a preferred solution of this embodiment: the control circuit 13 is electrically connected to the pressure sensor 12, the delivery pump 9 and the high-definition touch screen 15 through wires, so as to control various electrical appliances.

[0032] As a preferred solution of this embodiment: the filtering accuracy of the first filter 2 and the second filter 3 are 2 mm and 0.5 mm respectively, to prevent particulate impurities in the liquid storage container from entering the pipeline and blocking the pipeline or causing the pump body seal to fail.

[0033] As a preferred solution of this embodiment: multiple safety protection measures are arranged inside the delivery pump housing 18: upper pressure limit alarm, overpressure alarm, automatic stop and shutdown of alarm, high pressure unloading protection, which can protect the pre-cooling chamber 6 and the delivery pump protection 18.

[0034] As a preferred solution of this embodiment: the pre-cooling chamber 6 adopts a film compressor for refrigeration, and adopts a fully automatic PID temperature control system, which can automatically adjust and control the constant refrigeration temperature without human intervention.

[0035] As a preferred solution of this embodiment: the output end of the recovery inlet through-plate connector 8 is interconnected with the purification component 7, and the perfect purification and recovery structure enables the carbon dioxide to be effectively reused, reduces waste, and saves energy and is environmentally friendly.

[0036] Embodiment 1, as Figure 1-2As shown, the pre-cooling chamber 6 is a pre-cooling chamber component including a refrigeration system, with a diaphragm compressor refrigeration system and a point light source, wherein the compressor refrigeration system provides the low temperature required for the liquefaction of high-pressure carbon dioxide for the pre-cooling chamber, and adopts a high-precision PID automatic temperature control system; the point light source is for lighting inside the pre-cooling chamber 6, so that the user can clearly observe the actual liquid level of the liquid carbon dioxide in the pre-cooling chamber 6 through the self-tightening and high-pressure resistant window 5, so as to ensure that the pre-cooling temperature can meet the liquid supply at the corresponding flow rate of the pump body.

[0037] Embodiment 2, as Figure 1-2 As shown, the main structure of the control circuit 13 is composed of a single-chip main control program and a control board, which is connected to a high-definition touch screen 15 installed on the delivery pump panel through serial communication, and a control interface is displayed through an HMI high-definition line; the control functions are mainly parameter setting and operation of the constant current control mode and the constant pressure control mode, as well as the control of the pump main action part and the sensor signal acquisition and processing.

[0038] Working principle: In use, the filtration accuracy of the first filter 2 and the second filter 3 are 2 microns and 0.5 microns respectively, which can prevent particulate impurities in the liquid carbon dioxide storage container 1 from entering the pipeline and blocking the pipeline or causing the sealing failure of the delivery pump 9;

[0039] The used carbon dioxide can be directly input into the pre-cooling chamber through the recovery inlet through-plate joint 8 and the purification component 7 for purification, so as to be stored for reuse or directly recycled, thus greatly reducing waste and using efficiency;

[0040] The liquid carbon dioxide passes through the precooling liquid storage of the precooling chamber 6, enters the delivery pump 9 through the output port 19, directly enters the pump head inlet port 10, and is output through the high-pressure output port 11 after the secondary pressurization of the parallel pump body. The output pressure is collected in real time by the pressure sensor 12 for feedback control of the safety pressure value in the constant flow mode and PID regulation control of the constant pressure in the constant pressure mode; after flowing through the pressure sensor 12, it passes through the output end high-precision filter 16 and the output end through-plate connector 17, and directly enters the terminal instrument for direct connection. The output end high-precision filter 16 mainly prevents the particulate dust that may be carried by the liquid carbon dioxide after the pipeline flow path or pump body pressurization from entering the terminal connection instrument, causing pipeline blockage or sample contamination;

[0041] The main structural components of the control circuit 13 are a single-chip main control program and a control board, which are connected to a high-definition touch screen 15 installed on the delivery pump panel through serial communication, and a control interface is displayed through an HMI high-definition line; the control functions are mainly the parameter setting and operation of the constant current control mode and the constant pressure control mode, as well as the control of the pump main action part and the sensor signal acquisition and processing.

[0042] Finally, it should be noted that the above content is only used to illustrate the technical solution of the present invention, rather than to limit the scope of protection of the present invention. Simple modifications or equivalent substitutions of the technical solution of the present invention by ordinary technicians in this field do not deviate from the essence and scope of the technical solution of the present invention.

Claims

1. A liquid carbon dioxide delivery pump with a visible pre-cooling chamber, comprising a delivery pump housing (18), characterized in that: A delivery pump housing through-plate high-pressure connector (4) and a recovery inlet through-plate connector (8) are respectively arranged on one side of the delivery pump housing housing (18); a second filter (3) is arranged at the input end of the delivery pump housing through-plate high-pressure connector (4); a first filter (2) is arranged at the input end of the second filter (3); a liquid carbon dioxide storage container (1) is arranged at the input end of the first filter (2); a precooling chamber (6) is arranged on one side of the front end of the delivery pump housing (18); a self-tightening sealing high-pressure resistant window (5) is arranged at the front end of the delivery pump housing (18); a purification component (7) and an output port (19) are respectively arranged on both sides of the back of the precooling chamber (6); The output end of the output port (19) is provided with a delivery pump (9), the output end of the delivery pump (9) is provided with a pressure sensor (12), the output end of the pressure sensor (12) is provided with an output end high-precision filter (16), the output end of the high-precision filter (16) is provided with a control circuit (13) at the back end of the delivery pump housing (18), the interface of the control circuit (13) is connected with a connecting line (14), the front end of the delivery pump housing (18) is provided with a high-definition touch display screen (15) at a side away from the pre-cooling chamber (6), and the side of the delivery pump housing (18) away from the delivery pump housing through-plate high-pressure connector (4) is provided with an output end through-plate connector (17).

2. A liquid carbon dioxide delivery pump with a visible pre-cooling chamber according to claim 1, characterized in that: The delivery pump (9) comprises a high-pressure output port (11) and a pump head inlet end (10), the input end of the pump head inlet end (10) and the output end of the output port (19) are interconnected, the output end of the delivery pump (9) is provided with a high-pressure output port (11), and the output end of the high-pressure output port (11) is interconnected with a pressure sensor (12).

3. The liquid carbon dioxide delivery pump with a visible pre-cooling chamber according to claim 1, characterized in that: The precooling chamber (6) is a precooling chamber component including a refrigeration system, and is provided with a diaphragm compressor refrigeration system and a point light source.

4. The liquid carbon dioxide delivery pump with a visible pre-cooling chamber according to claim 1 is characterized in that: The output end of the output end through-plate connector (17) is connected to a supercritical carbon dioxide drying apparatus.

5. The liquid carbon dioxide delivery pump with a visible pre-cooling chamber according to claim 1 is characterized in that: The control circuit (13) comprises a single-chip microcomputer main control program and a control board. The control circuit (13) is connected to a high-definition touch screen (15) via serial port communication. The control circuit (13) displays a control interface via an HMI high-definition line.

6. The liquid carbon dioxide delivery pump with a visible pre-cooling chamber according to claim 1, characterized in that: The control circuit (13) is electrically connected to the pressure sensor (12), the delivery pump (9) and the high-definition touch display screen (15) via wires.

7. The liquid carbon dioxide delivery pump with a visible pre-cooling chamber according to claim 1 is characterized in that: The filtering accuracies of the first filter (2) and the second filter (3) are 2 mm and 0.5 mm respectively.

8. The liquid carbon dioxide delivery pump with a visible pre-cooling chamber according to claim 1, characterized in that: Multiple safety protection measures are arranged inside the delivery pump housing (18): upper pressure limit alarm, overpressure alarm, alarm automatic stop and shut-off, and high-pressure unloading protection.

9. The liquid carbon dioxide delivery pump with a visible pre-cooling chamber according to claim 1, characterized in that: The precooling chamber (6) adopts a thin film compressor for refrigeration and a fully automatic PID temperature control system.

10. The liquid carbon dioxide delivery pump with a visible pre-cooling chamber according to claim 1, characterized in that: The output end of the recovery inlet through-plate connector (8) is interconnected with the purification component (7).

Images