Precise continuous sampling device

Abstract

The utility model provides a precise continuous sampling device which comprises a piston cylinder, a heat exchange mechanism, a piston and a driving mechanism, the piston cylinder is provided with a piston cavity, and the piston cylinder is provided with an inlet and outlet interface; the heat exchange mechanism is arranged on the outer wall of the piston cylinder; the piston is slidably arranged in the piston cavity. In the working process, after the piston cylinder is emptied, a condensable gas sample with pressure can be input into the piston cylinder from the inlet and outlet connector, and then the condensable gas sample in the piston cylinder is cooled through the heat exchange mechanism, so that the condensable gas sample is liquefied into a liquid sample until the whole piston cylinder is filled with the liquid sample; during sample injection, the piston is driven by the driving mechanism to reach a target position, so that a liquid sample with a target injection amount is output from the inlet / outlet interface; or the liquid sample with pressure is input from the inlet and outlet interface and fills the whole piston cylinder, and the piston is driven to reach the target position through the driving mechanism during sample injection, so that the liquid sample with the target injection amount is output from the inlet and outlet interface, and the precise injection sample injection of the sample is realized.

Description

Technical Field

[0001] The embodiment of the utility model relates to the technical field of chemical equipment, and in particular to a precision continuous sampling device under medium and high pressure, such as 5 MPa, and large capacity. Background Art

[0002] In chemical production, sample injection devices are often used to inject samples into designated containers. Currently, some injection devices utilize plunger pumps for this operation. A plunger pump uses a cam to drive a plunger rod back and forth within a cylinder, creating a pressure differential that injects fluid into the designated container. The amount of fluid delivered per plunger cycle depends on the stroke length, and rotating the plunger controls the delivery time and, therefore, the volume. During operation, a cam on the injection pump's camshaft and a plunger spring cause the plunger to reciprocate upward and downward, delivering fluid. However, this type of injection device has the following disadvantages: 1. It is sensitive to liquid contamination and has stringent requirements for the cleanliness of the working medium. 2. The input material experiences significant pulsation, which can easily lead to unstable flow and inaccurate injection. 3. It requires high maintenance and operation requirements when working with impure working media. 4. Its mechanical structure is complex, with a large number of parts, resulting in high manufacturing and maintenance costs.

[0003] Some current injection devices use syringe pumps for input operations. During operation, the single-chip microcomputer system sends control pulses to rotate the stepper motor, which in turn drives the screw to convert the rotational motion into linear motion, pushing the syringe piston for injection and infusion, achieving high-precision, smooth, and pulsation-free liquid transmission. However, this type of injection device has the following disadvantages: 1. The injection volume is limited each time. If a large amount of reagent is required, repeated injections are required, which is prone to contamination and time-consuming. 2. Air is easily inhaled during injection, resulting in gas retention in the system, which affects the experimental results. 3. The syringe pump's suction process is relatively complex. If a variety of different liquids are to be transferred, different cleaning and replacement processes must be configured, which can easily cause liquid contamination. 4. The syringe is prone to wear and tear under reciprocating injection conditions, resulting in a short lifespan. 5. Due to mechanical structural limitations, the syringe pump is difficult to withstand the injection process in a high-pressure experimental environment. Utility Model Content

[0004] The purpose of the embodiment of the utility model is to provide a precise continuous sampling device, aiming to design a sampling device that can realize precise injection sampling of large-volume samples under medium and high pressure.

[0005] In order to solve the above technical problems, the embodiment of the present utility model provides a precise continuous sampling device, comprising:

[0006] A piston cylinder, wherein a piston cavity is provided in the piston cylinder, and an inlet and outlet interface communicating with the piston cavity is provided on the piston cylinder;

[0007] a heat exchange mechanism, the heat exchange mechanism being disposed on the outer wall of the piston cylinder, so as to cool the condensable gas sample input into the piston cavity from the inlet and outlet interface through the heat exchange mechanism, so that the condensable gas sample is liquefied into a liquid sample;

[0008] a piston, the piston being slidably disposed in the piston cavity so as to output the liquid sample in the piston cavity from the inlet and outlet interface through the piston;

[0009] A driving mechanism is connected to the piston in a power coupling manner so as to drive the piston to slide along the piston cavity.

[0010] Preferably, the piston cylinder comprises:

[0011] A cylinder body, wherein the cylinder body is cylindrical, the inner side of the cylinder body forms the piston cavity, and one end of the cylinder body close to the inlet and outlet interface is open;

[0012] a cylinder cover, the cylinder cover being sealingly disposed on one end of the cylinder body close to the inlet and outlet ports;

[0013] a cylinder head pressing piece, the cylinder head pressing piece abutting against a side of the cylinder head away from the cylinder body, and an end of the cylinder head pressing piece close to the cylinder body being sleeved over the cylinder head and an end of the cylinder body close to the cylinder head;

[0014] Wherein, the inlet and outlet interface is provided on the cylinder cover pressure piece, and one end of the inlet and outlet interface close to the cylinder body passes through the cylinder cover and is connected to the piston chamber.

[0015] Preferably, a first annular seal is provided between the cylinder body and the cylinder head.

[0016] Preferably, the cylinder head pressing piece is fixedly connected to the cylinder body via locking bolts, and a plurality of locking bolts are arranged at intervals along the circumference of the cylinder head pressing piece.

[0017] Preferably, the heat exchange mechanism includes a heat exchange cylinder, which is sleeved on the outside of the piston cylinder. A surrounding cooling groove is provided on the inner side of the heat exchange cylinder. The heat exchange cylinder is provided with a liquid inlet and a liquid outlet connected to the surrounding cooling groove, so that the heat exchange medium enters the surrounding cooling groove from the liquid inlet and then flows out from the liquid outlet.

[0018] Preferably, two sealing grooves are provided on the inner side surface of the heat exchange cylinder, and the two sealing grooves are respectively located on both sides of the surrounding cooling groove, the liquid inlet and the liquid outlet in the extension direction of the heat exchange cylinder, and a second annular seal is provided at each sealing groove.

[0019] Preferably, an input and output switching valve is provided at the inlet and outlet interface.

[0020] Preferably, the end of the piston cylinder away from the inlet and outlet interface is open, the driving end of the driving mechanism extends into the piston cavity and is sealed at the end of the piston cylinder away from the inlet and outlet interface, and the piston is arranged on the driving end of the driving mechanism.

[0021] Preferably, the piston cylinder is provided with a balancing gas inlet and a balancing gas outlet communicating with the piston cavity, and the balancing gas inlet and the balancing gas outlet are located on a side of the piston away from the inlet and outlet interface.

[0022] Preferably, the driving mechanism is a servo electric cylinder.

[0023] Preferably, the precise continuous sampling device is also used for the precise continuous sampling of pressurized liquid samples.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] When the precision continuous sampling device of the present invention is in operation, after the piston cylinder is emptied by the driving mechanism, a pressurized condensable gas sample can be input into the piston cylinder from the inlet and outlet interfaces. The condensable gas sample in the piston cylinder is then cooled by the heat exchange mechanism, causing the condensable gas sample to liquefy into a liquid sample until the entire piston cylinder is filled with the liquid sample. During sampling, the driving mechanism drives the piston to a target position to output a target injection volume of the liquid sample from the inlet and outlet interfaces, thereby achieving precise injection of the sample. Alternatively, the pressurized liquid sample can be directly input into the piston cylinder from the inlet and outlet interfaces until the liquid sample fills the entire piston cylinder. During sampling, the driving mechanism drives the piston to a target position to output a target injection volume of the liquid sample from the inlet and outlet interfaces, thereby achieving precise injection of the liquid sample. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] One or more embodiments are exemplarily illustrated by pictures in the corresponding drawings. These exemplifications do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings are represented as similar elements. Unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0027] Figure 1 This is a schematic structural diagram of a precise continuous sample feeding device in an embodiment of the present utility model;

[0028] Figure 2 for Figure 1 Schematic diagram of the structure of the middle piston cylinder;

[0029] Figure 3 for Figure 2 Schematic diagram of the structure of the heat exchange mechanism;

[0030] Figure 4 for Figure 1 Schematic diagram of the structure of the input and output switching valve.

[0031] Description of the accompanying drawings of this utility model:

[0032] Precision continuous sampling device 100, piston cylinder 1, piston chamber 11, cylinder body 12, cylinder head 13, cylinder head pressing piece 14, first annular seal 15, locking bolt 16, inlet and outlet interface 2, input and output switching valve 21, injection switch 22, sample output switch 23, heat exchange mechanism 3, heat exchange cylinder 31, surrounding cooling groove 32, liquid inlet 33, liquid outlet 34, sealing groove 35, piston 4, driving mechanism 5, servo electric cylinder 5a, driving end 51, balancing gas inlet 6, balancing gas outlet 7, second annular seal 8.

[0033] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0034] 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 embodiments described 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 making creative efforts are within the scope of protection of the present invention.

[0035] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly.

[0036] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features specified as "first" or "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between the various embodiments can be combined with each other, but this must be based on the fact that ordinary technicians in this field can implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0037] The utility model provides a precise continuous sampling device, which can realize precise continuous sampling under medium and high pressure (such as 5Mpa) and large volume. The precise continuous sampling device can be used for sampling condensable hazardous substances, such as ethylene oxide (EO) or hazardous liquid propylene oxide (PO). Figures 1 to 4 A preferred embodiment of the precise continuous sampling device provided by the present utility model is shown.

[0038] See also Figure 1 and Figure 2 In this embodiment, the precision continuous sampling device 100 includes a piston cylinder 1, an inlet and outlet interface 2, a heat exchange mechanism 3, a piston 4 and a driving mechanism 5.

[0039] See also Figure 1 、 Figure 2 and Figure 4 A piston chamber 11 is provided in the piston cylinder 1 , and an inlet and outlet interface 2 communicating with the piston chamber 11 is provided on the piston cylinder 1 .

[0040] Specifically, the piston cylinder 1 is a hollow structure, so that a piston cavity 11 is formed inside the piston cylinder 1. A mounting hole is provided through one end of the piston cylinder 1 in the extension direction of the piston cylinder 1, and the mounting hole is connected to the piston cavity 11. The inlet and outlet interface 2 is provided at the mounting hole of the piston cylinder 1 so that the inlet and outlet interface 2 can be connected to the piston cavity 11. The piston cylinder 1 is usually made of corrosion-resistant and high-pressure resistant materials such as stainless steel, so that the piston cavity 11 has corrosion resistance, so that the precision injection sampling of some hazardous substances can be achieved through the precision continuous sampling device 100, and precision injection sampling can also be achieved under high pressure. The extension direction of the piston cylinder 1 is defined as the up and down direction below, and the end of the piston cylinder 1 where the inlet and outlet interface 2 is provided is the upper end of the piston cylinder 1. A piston cavity 11 extending in the up and down direction is provided in the piston cylinder 1, and the inlet and outlet interface 2 is connected to the upper end of the piston cavity 11.

[0041] The specific style of the piston cylinder 1 can be set according to actual conditions. Figure 1 and Figure 2 In this embodiment, the piston cylinder 1 includes a cylinder body 12, a cylinder head 13 and a cylinder head pressing piece 14. The cylinder body 12 is cylindrical, and the inner side of the cylinder body 12 forms a piston chamber 11. The end of the cylinder body 12 close to the inlet and outlet interface 2 is open; the cylinder head 13 is sealed and arranged at the end of the cylinder body 12 close to the inlet and outlet interface 2; the cylinder head pressing piece 14 abuts against the side of the cylinder head 13 away from the cylinder body 12, and the end of the cylinder head pressing piece 14 close to the cylinder body 12 is sleeved on the cylinder head 13 and the outside of the end of the cylinder body 12 close to the cylinder head 13; wherein the inlet and outlet interface 2 is arranged on the cylinder head pressing piece 14, and the end of the inlet and outlet interface 2 close to the cylinder body 12 passes through the cylinder head 13 and is connected to the piston chamber 11.

[0042] Specifically, the cylinder body 12 is arranged in a cylindrical shape extending in the vertical direction, thereby forming a piston chamber 11 on the inner side of the cylinder body 12. The upper end of the cylinder body 12 is open to form an upward opening, and the cylinder head 13 covers the upper opening of the cylinder body 12. The cylinder head pressing piece 14 is located on the upper side of the cylinder head 13. The cylinder head pressing piece 14 is fixedly connected to the cylinder body 12, thereby clamping and fixing the cylinder head 13 between the cylinder head pressing piece 14 and the cylinder body 12. The mounting hole is provided on the upper surface of the cylinder head pressing piece 14, and the mounting hole passes through the cylinder head pressing piece 14 and the cylinder head 13 in sequence downward, so that the lower end of the mounting hole can communicate with the piston chamber 11.

[0043] The specific fixing method of the inlet and outlet interface 2 at the mounting hole is not particularly limited. Figure 1 and Figure 2 In this embodiment, the mounting hole includes an upper hole section located on the cylinder head pressure piece 14 and a lower hole section located on the cylinder head 13. The aperture of the upper hole section is larger than that of the lower hole section. The inlet and outlet interface 2 is configured to be larger at the top and smaller at the bottom so that the shape of the inlet and outlet interface 2 matches the shape of the mounting hole. A downward-facing annular limiting surface is formed between the upper and lower ends of the inlet and outlet interface 2. The upper end of the inlet and outlet interface 2 is located within the upper hole section of the mounting hole. The annular limiting surface of the inlet and outlet interface 2 abuts the upper surface of the cylinder head 13. The lower end of the inlet and outlet interface 2 is located within the lower hole section of the mounting hole. A threaded connection structure is provided between the lower end of the inlet and outlet interface 2 and the inner wall of the lower hole section of the mounting hole. The inlet and outlet interface 2 can use a detachable high-pressure-resistant joint to ensure that the high-pressure cylinder body is leak-free.

[0044] Optionally, see Figure 1 and Figure 2 In this embodiment, a first boss is provided on the lower surface of the cylinder head 13, and the first boss extends into the cylinder body 12 from the upper opening. In this way, the first boss of the cylinder head 13 cooperates with the upper opening of the cylinder body 12 to achieve installation and positioning between the cylinder head 13 and the cylinder body 12.

[0045] Optionally, see Figure 1 and Figure 2 In this embodiment, a first annular seal 15 is provided between the cylinder body 12 and the cylinder head 13. The first annular seal 15 is provided between the upper end surface of the cylinder body 12 and the lower surface of the cylinder head 13. The provision of the first annular seal 15 can improve the sealing performance of the connection between the cylinder body 12 and the cylinder head 13.

[0046] Optionally, see Figure 1 and Figure 2 In this embodiment, a second boss is provided on the lower surface of the cylinder head pressing piece 14, and a receiving groove is provided on the lower surface of the second boss. The upper end of the cylinder body 12 and the cylinder head 13 are located in the receiving groove, so that the lower end of the cylinder head pressing piece 14 is sleeved on the outside of the upper end of the cylinder head 13 and the cylinder body 12.

[0047] Optionally, see Figure 1 and Figure 2 In this embodiment, the cylinder head pressing piece 14 is fixedly connected to the cylinder body 12 via locking bolts 16. Multiple locking bolts 16 are provided at intervals along the circumference of the cylinder head pressing piece 14. The tail ends of the locking bolts 16 pass through the cylinder body 12 from bottom to top and are then threadedly connected to the cylinder head pressing piece 14. The specific number of locking bolts 16 can be set according to actual conditions. For example, there can be two, three, four, five, six, or more locking bolts 16. The following description will take the example of the cylinder head pressing piece 14 and the cylinder body 12 being fixedly connected via four locking bolts 16.

[0048] A control valve is usually provided at the inlet and outlet interface 2 to adjust the conduction state of the inlet and outlet interface 2 through the control valve. Figure 1 and Figure 4 In this embodiment, an input / output switching valve 21 is provided at the input / output interface 2 .

[0049] Specifically, the input / output switching valve 21 is provided with an injection switch 22 and an output switch 23, so that the input / output switching valve 21 has an input state and an output state. When the input / output switching valve 21 is in the input state, the sample can be input into the piston chamber 11 of the piston cylinder 1 from the inlet / outlet interface 2. When the input / output switching valve 21 is in the output state, the sample in the piston chamber 11 can be output from the inlet / outlet interface 2. The following will be described using the input / output switching valve 21 provided at the inlet / outlet interface 2 as an example. The cylinder body 12 has a large capacity, and large-capacity circulating injection can be achieved through the input / output switching valve 21.

[0050] See also Figures 1 to 3 The heat exchange mechanism 3 is provided on the outer wall of the piston cylinder 1 so as to cool the condensable gas sample inputted into the piston cavity 11 from the inlet and outlet interface 2 through the heat exchange mechanism 3 so that the condensable gas sample is liquefied into a liquid sample.

[0051] Specifically, the precision continuous sampling device 100 is equipped with a heat exchange mechanism 3, which provides both cooling and heating functions, thereby cooling and heating the sample within the piston chamber 11. The following description uses the example of the heat exchange mechanism 3 cooling the sample within the piston chamber 11. The heat exchange mechanism 3 is capable of converting liquefiable gases within the cooling temperature range into liquids, irreversibly under operating conditions. After the sample is introduced into the piston chamber 11 in gaseous form from the inlet and outlet port 2, the heat exchange mechanism 3 cools the condensable gas sample within the piston chamber 11, liquefying it into a liquid sample.

[0052] The specific style of the heat exchange mechanism 3 can be set according to actual conditions. Figures 1 to 3In this embodiment, the heat exchange mechanism 3 includes a heat exchange cylinder 31, which is sleeved on the outside of the piston cylinder 1. A surrounding cooling groove 32 is provided on the inner side of the heat exchange cylinder 31. The heat exchange cylinder 31 is provided with a liquid inlet 33 and a liquid outlet 34 connected to the surrounding cooling groove 32, so that the heat exchange medium enters the surrounding cooling groove 32 from the liquid inlet 33 and then flows out from the liquid outlet 34.

[0053] Specifically, the heat exchange cylinder 31 is arranged in a cylindrical shape extending in the vertical direction, and the inner side surface of the heat exchange cylinder 31 is provided with a surrounding cooling groove 32, which is arranged to extend in a spiral along the circumference and vertical direction of the heat exchange cylinder 31. The heat exchange cylinder 31 is sleeved on the outside of the cylinder body 12, and the inner side surface of the heat exchange cylinder 31 fits with the outer side surface of the cylinder body 12 so that the outer side surface of the cylinder body 12 covers the notch of the surrounding cooling groove 32. The liquid inlet 33 and the liquid outlet 34 are arranged on the outer side surface of the heat exchange cylinder 31 at intervals in the upper and lower directions. The liquid inlet 33 and the liquid outlet 34 are respectively connected to the two ends of the surrounding cooling groove 32 in the extension direction. The heat exchange cylinder 31 is wrapped around the piston cylinder 1. After the cooling medium is passed into the heat exchange cylinder 31, the sample in the piston cavity 11 can be cooled by the cooling medium.

[0054] Optionally, see Figures 1 to 3 In this embodiment, an upward-facing annular stopper surface is provided on the outer circumference of the cylinder 12, and the annular stopper surface abuts the lower side of the lower end of the heat exchange cylinder 31. The abutment between the annular stopper surface and the lower end surface of the heat exchange cylinder 31 ensures that the cylinder 12 and the heat exchange cylinder 31 are installed and positioned.

[0055] Optionally, see Figures 1 to 3 In this embodiment, two sealing grooves 35 are provided on the inner side surface of the heat exchange cylinder 31. The two sealing grooves 35 are respectively located on both sides of the surrounding cooling groove 32, the liquid inlet 33, and the liquid outlet 34 in the extension direction of the heat exchange cylinder 31. A second annular seal 8 is provided at each sealing groove 35.

[0056] Specifically, two sealing grooves 35 are provided on the inner side of the heat exchange cylinder 31, spaced apart vertically. The two sealing grooves 35 are located above and below the surrounding cooling groove 32, respectively. Two second annular seals 8 are provided in the two sealing grooves 35, one of which is located between the upper end of the heat exchange cylinder 31 and the upper end of the cylinder 12, and the other is located between the lower end of the heat exchange cylinder 31 and the lower end of the cylinder 12. The provision of the two second annular seals 8 improves the sealing performance of the connection between the cylinder 12 and the heat exchange cylinder 31.

[0057] See also Figure 1 and Figure 2The piston 4 can be slidably arranged in the piston cavity 11 so as to output the liquid sample in the piston cavity 11 from the inlet and outlet interface 2 through the piston 4; the driving mechanism 5 is dynamically coupled to the piston 4 so as to drive the piston 4 to slide along the piston cavity 11 through the driving mechanism 5.

[0058] Specifically, the piston 4 can be slidably arranged in the piston cavity 11 up and down, and the driving mechanism 5 can drive the piston 4 to slide up and down along the piston cavity 11. The driving mechanism 5 can be a servo electric cylinder 5a, etc., and the following will be introduced using the driving mechanism 5 as an example of a servo electric cylinder 5a. The servo electric cylinder 5a serves as a driving power and can provide a continuous and stable output force with adjustable speed, thereby enabling high-precision injection and sampling. The piston 4, the first annular seal 15, and the second annular seal 8 are usually made of corrosion-resistant and high-pressure resistant sealing materials. The piston 4 has low friction, low noise, compact structure, and is easy to maintain.

[0059] Before inputting the condensable gas sample into the piston chamber 11, the servo electric cylinder 5a is used to drive the piston 4 to slide down to the lowest point, and the input-output switching valve 21 is switched to the input state; then the pressurized condensable gas sample is input into the piston chamber 11 from the inlet and outlet interface 2, and at the same time, the cooling medium is introduced into the heat exchange cylinder 31, so that the condensable gas sample in the piston chamber 11 is liquefied into a liquid sample until the liquid sample fills the entire piston chamber 11; finally, when injecting the sample, the input-output switching valve 21 is switched to the output state, and the servo electric cylinder 5a is used to drive the piston 4 to slide up to the target position, so that the target injection amount of the liquid sample is output from the inlet and outlet interface 2, thereby realizing the precise injection of the sample.

[0060] Optionally, in this embodiment, the precise continuous sampling device 100 is also used for the precise continuous sampling of pressurized liquid samples.

[0061] Specifically, in addition to being used for continuous and precise sampling of pressurized condensable gas samples, the precision continuous sampling device 100 can also be used for continuous and precise sampling of pressurized liquid samples. When the precision continuous sampling device 100 is used for continuous and precise sampling of pressurized liquid samples, the pressurized liquid sample can be directly input into the piston cylinder 1 from the inlet and outlet interface 2 until the liquid sample fills the entire piston cylinder 1. During sampling, the driving mechanism 5 drives the piston 4 to the target position to output the target injection volume of the liquid sample from the inlet and outlet interface 2, thereby achieving precise injection of the liquid sample.

[0062] When the precision continuous sampling device 100 of the present invention is in operation, after the piston cylinder 1 is emptied by the driving mechanism 5 driving the piston 4, the pressurized condensable gas sample can be input into the piston cylinder 1 from the inlet and outlet interface 2, and then the condensable gas sample in the piston cylinder 1 is cooled by the heat exchange mechanism 3, so that the condensable gas sample is liquefied into a liquid sample until the liquid sample fills the entire piston cylinder 1. During sampling, the driving mechanism 5 drives the piston 4 to the target position to output the target injection amount of the liquid sample from the inlet and outlet interface 2, thereby achieving precise injection sampling of the sample. Alternatively, the pressurized liquid sample can be directly input into the piston cylinder 1 from the inlet and outlet interface 2 until the liquid sample fills the entire piston cylinder 1. During sampling, the driving mechanism 5 drives the piston 4 to the target position to output the target injection amount of the liquid sample from the inlet and outlet interface 2, thereby achieving precise injection sampling of the liquid sample.

[0063] Optionally, see Figure 1 and Figure 2 In this embodiment, the end of the piston cylinder 1 away from the inlet and outlet interface 2 is open, the driving end 51 of the driving mechanism 5 extends into the piston cavity 11 and is sealed at the end of the piston cylinder 1 away from the inlet and outlet interface 2, and the piston 4 is arranged on the driving end 51 of the driving mechanism 5.

[0064] Specifically, the lower end of the piston cylinder 1 (i.e., the cylinder body 12) is open to form a lower opening, and the upper end of the driving mechanism 5 is the driving end 51. The upper end of the driving mechanism 5 extends upward into the piston cylinder 1 from the lower opening, and relies on the upper end of the driving mechanism 5 to block the lower opening of the piston cylinder 1.

[0065] Optionally, see Figure 1 and Figure 2 In this embodiment, the piston cylinder 1 is provided with a balancing gas inlet 6 and a balancing gas outlet 7 connected to the piston chamber 11. The balancing gas inlet 6 and the balancing gas outlet 7 are located on the side of the piston 4 away from the inlet and outlet interface 2.

[0066] Specifically, when the piston 4 is at the lowest point, the balancing gas inlet 6 and the balancing gas outlet 7 are located on the lower side of the piston 4. The piston cylinder 1 is connected to the balancing gas through the balancing gas inlet 6 and the balancing gas outlet 7, which not only reduces the pressure difference between the piston cylinder 1 and the outside world, but also allows the balancing gas to take away the sample overflowing from the lower side.

[0067] The piston 4 and cylinder 12 of the precision continuous sampling device 100 use N low-temperature-resistant and corrosion-resistant annular seals (N≥1) for reliable sealing, and are suitable for precision continuous sampling under medium and high pressures.

[0068] The precision continuous sampling device 100 has the following advantages: 1. The inner wall of the cylinder body 12 is smooth and fits tightly with the piston 4. The piston 4 is annularly sealed, and the cylinder body 12 and the cylinder head 13 are mechanically matched, and the overall sealing performance is better than traditional sealing; 2. It is equipped with a gas balance module (i.e., the balance gas inlet 6 and the balance gas outlet 7), which can reduce the pressure difference, reduce the load on the sealing material, and enhance the sealing and service life; 3. The servo electric cylinder 5a uses instruction control to provide precise micro-injection sampling; 4. It has a high-pressure resistant mechanical structure, which is safe and reliable; 5. The heat exchange mechanism 3 can change the cooling temperature according to demand; 6. The input and output switching valve 21 can realize automatic switching, the import and export are connected, and maintenance is convenient; 7. The mechanical structure is compact, the control is simple, and the maintenance is convenient.

[0069] The precision continuous sampling device 100 can provide automatic sampling under higher pressure and larger capacity. The mechanical structure of the precision continuous sampling device 100 is compact, the parts are precisely matched, and the piston chamber 11 is reliably sealed under the premise of bearing high pressure. The piston 4 uses high-pressure resistant sealing materials to assist the mechanical structure in sealing and achieve leak-free. The inlet and outlet interfaces 2 use corrosion-resistant and high-pressure resistant detachable joints, and the device is safe and reliable. The precision continuous sampling device 100 can be equipped with a heat exchange mechanism 3 to provide cooling or heating functions through an external medium to achieve liquefaction of liquefiable gas or heating of the working medium. The precision continuous sampling device 100 can be equipped with a balancing module to reduce the internal and external pressure difference, effectively extend the service life of the sealing material, increase the sealing effect, and effectively prevent the working medium from overflowing. The input and output switching valve 21 controls the switching, provides stable automatic sampling, and ensures that the working medium does not come into contact with the air, ensuring precise sampling. The precision continuous sampling device 100 uses a servo electric cylinder 5a to provide stable and continuous thrust output, and precisely control the injection speed and injection volume of the liquid.

[0070] The above are only preferred embodiments of the present invention and do not limit the patent scope of the present invention. All equivalent structural transformations made by using the contents of the present invention specification and drawings under the utility model concept, or direct / indirect application in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A precision continuous sampling device, characterized in that: include: A piston cylinder, wherein a piston cavity is provided in the piston cylinder, and an inlet and outlet interface communicating with the piston cavity is provided on the piston cylinder; a heat exchange mechanism, the heat exchange mechanism being disposed on the outer wall of the piston cylinder, so as to cool the condensable gas sample input into the piston cavity from the inlet and outlet interface through the heat exchange mechanism, so that the condensable gas sample is liquefied into a liquid sample; a piston, the piston being slidably disposed in the piston cavity so as to output the liquid sample in the piston cavity from the inlet and outlet interface through the piston; A driving mechanism is connected to the piston in a power coupling manner so as to drive the piston to slide along the piston cavity.

2. The precise continuous sample feeding device according to claim 1, characterized in that: The piston cylinder comprises: A cylinder body, wherein the cylinder body is cylindrical, the inner side of the cylinder body forms the piston cavity, and one end of the cylinder body close to the inlet and outlet interface is open; a cylinder cover, the cylinder cover being sealingly disposed on one end of the cylinder body close to the inlet and outlet ports; a cylinder head pressing piece, the cylinder head pressing piece abutting against a side of the cylinder head away from the cylinder body, and an end of the cylinder head pressing piece close to the cylinder body being sleeved over the cylinder head and an end of the cylinder body close to the cylinder head; Wherein, the inlet and outlet interface is provided on the cylinder cover pressure piece, and one end of the inlet and outlet interface close to the cylinder body passes through the cylinder cover and is connected to the piston chamber.

3. The precise continuous sample feeding device according to claim 2, characterized in that: A first annular seal is provided between the cylinder body and the cylinder head.

4. The precise continuous sample feeding device according to claim 2, characterized in that: The cylinder head pressing piece is fixedly connected to the cylinder body via locking bolts, and a plurality of locking bolts are arranged at intervals along the circumference of the cylinder head pressing piece.

5. The precise continuous sample feeding device according to claim 1, characterized in that: The heat exchange mechanism includes a heat exchange cylinder, which is sleeved on the outside of the piston cylinder. A surrounding cooling groove is provided on the inner side of the heat exchange cylinder. The heat exchange cylinder is provided with a liquid inlet and a liquid outlet connected to the surrounding cooling groove, so that the heat exchange medium enters the surrounding cooling groove from the liquid inlet and then flows out from the liquid outlet.

6. The precise continuous sample feeding device according to claim 5, characterized in that: Two sealing grooves are provided on the inner side surface of the heat exchange cylinder, and the two sealing grooves are respectively located on both sides of the surrounding cooling groove, the liquid inlet and the liquid outlet in the extension direction of the heat exchange cylinder, and each sealing groove is provided with a second annular seal.

7. The precise continuous sample feeding device according to claim 1, characterized in that: An input and output switching valve is provided at the inlet and outlet interfaces.

8. The precise continuous sample feeding device according to claim 1, characterized in that: The end of the piston cylinder away from the inlet and outlet interface is open, the driving end of the driving mechanism extends into the piston cavity and is sealed at the end of the piston cylinder away from the inlet and outlet interface, and the piston is arranged on the driving end of the driving mechanism.

9. The precise continuous sample feeding device according to claim 8, characterized in that: The piston cylinder is provided with a balancing gas inlet and a balancing gas outlet communicating with the piston cavity. The balancing gas inlet and the balancing gas outlet are located on a side of the piston away from the inlet and outlet interface.

10. The precise continuous sample feeding device according to claim 1, characterized in that: The driving mechanism is a servo electric cylinder.

11. The precise continuous sample feeding device according to claim 1, characterized in that: The precise continuous sampling device is also used for the precise continuous sampling of pressurized liquid samples.

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