Exhaust valve and sample analyzer

Abstract

The utility model relates to an exhaust valve and a sample analyzer, and relates to the technical field of sample analysis. The exhaust valve comprises a main body, a valve element, an elastic piece and a driving assembly, and a liquid channel and an exhaust branch communicated with the liquid channel are arranged in the main body; the driving assembly and the valve element are in clearance fit in the first direction, so that the connecting state of the driving assembly and the valve element comprises a driving state and a movable state, the driving assembly is used for driving the valve element to do linear motion, the valve element is made to be away from the exhaust branch to conduct the exhaust branch, and the elastic piece is configured to push and press the valve element towards the exhaust branch; when the connecting state of the driving assembly and the valve element is the movable state, the elastic piece is used for providing sealing force for sealing the exhaust branch for the valve element, stable sealing can be achieved, and meanwhile the service life of the exhaust valve is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of sample analysis, and particularly to an exhaust valve and a sample analyzer. Background Art

[0002] In a high performance liquid chromatography instrument, such as a glycosylated hemoglobin analyzer, a high-pressure pump is usually used to transport the mobile phase (eluent). Since the self-priming ability of the high-pressure pump is poor, on the one hand, when there are air bubbles in the pipeline, the high-pressure pump cannot suck in the eluent, resulting in the instrument not working properly; on the other hand, the air bubbles in the pipeline will cause fluctuations in the system pressure, thus reducing the test accuracy of the analyzer. Therefore, an exhaust valve needs to be provided on the output pipeline of the high-pressure pump to discharge the air bubbles in the pipeline when there are air bubbles in the pipeline.

[0003] Most of the existing exhaust valves are sealed by a threaded knob structure, which is easy to cause damage to the sealing surface or damage to the thread, resulting in sealing failure and a low service life of the exhaust valve. Summary of the Utility Model

[0004] The utility model provides an exhaust valve and a sample analyzer, which can achieve stable sealing and improve the service life of the exhaust valve at the same time.

[0005] In a first aspect, an embodiment of the utility model provides an exhaust valve, which includes:

[0006] A main body, in which a liquid channel and an exhaust branch communicating with the liquid channel are provided;

[0007] A valve core, which is movably installed in the main body and is used to conduct or seal the exhaust branch;

[0008] A driving component, which is used to drive the valve core to move linearly so that the valve core moves away from the exhaust branch to conduct the exhaust branch; the driving component is connected with the valve core and has a clearance fit in a first direction, so that the connection state between the driving component and the valve core includes two states: a driving state and a movable state;

[0009] An elastic member, which is configured to push the valve core towards the exhaust branch along the first direction. When the connection state between the driving component and the valve core is in the movable state, the elastic member is used to provide a sealing force for the valve core to seal the exhaust branch.

[0010] In some implementation manners, the driving component includes a first connecting member and a driving member, the first connecting member is connected to the driving member, and the driving member is used to drive the first connecting member to move;

[0011] The valve core includes a second connecting member;

[0012] One of the first connecting member and the second connecting member is provided with a connecting hole, and the other is provided with a connecting shaft;

[0013] The connecting shaft is inserted into the connecting hole, and in the first direction, the connecting hole is a kidney-shaped hole with a clearance fit with the connecting shaft.

[0014] In some implementation manners, the driving member is a lead screw motor.

[0015] In some implementation manners, the main body includes a valve seat and a pressure sensor. The pressure sensor is hermetically connected to the valve seat, and a first gap is defined between the pressure detection end face of the pressure sensor and the valve seat. The valve seat is provided with a liquid outlet, a liquid inlet communicating with the first gap, and the exhaust branch is connected to the first gap. The first gap, the liquid outlet and the liquid inlet together form a liquid channel.

[0016] In some implementation manners, the main body includes a valve seat. The valve seat is formed with a valve hole and a receiving cavity that are sequentially communicated with the liquid channel. The valve core is installed in the receiving cavity, and a first chamber is formed between the outer wall of the valve core and the inner wall of the receiving cavity. The valve seat is provided with an exhaust port communicating with the first chamber. The valve hole, the first chamber and the exhaust port form an exhaust branch.

[0017] In some implementation manners, the valve core includes a sealing shaft and a sealing head. The sealing shaft is hermetically connected to the receiving cavity to form a first chamber. The sealing head is arranged at one end of the sealing shaft close to the valve hole and protrudes from the end face of the sealing shaft. The sealing head is made of engineering plastic.

[0018] In some implementation manners, the main body further includes a first sleeve. The first sleeve is detachably connected to the valve seat, and a positioning protrusion is arranged in the first sleeve. The elastic member is installed in the first sleeve, one end of the elastic member abuts against the end face of the valve core, and the other end abuts against the positioning protrusion.

[0019] In some implementation manners, when the valve core seals the exhaust branch, the valve core is located at the first position;

[0020] The exhaust valve further includes a position sensor for detecting whether the valve core reaches the second position. When the valve core is located at the second position, the exhaust branch is conducted. The distance between the first position and the second position is the first distance.

[0021] In a second aspect, an embodiment of the present invention further provides a sample analyzer, which includes a recovery device and a liquid storage device, a high-pressure pump, an exhaust valve, a chromatographic column, and a detection device that are sequentially communicated;

[0022] The high-pressure pump is used to pump the eluent in the liquid storage device into the chromatographic column through the liquid channel of the exhaust valve, and the exhaust valve is the exhaust valve as described above;

[0023] The recovery device is communicated with the exhaust branch of the exhaust valve;

[0024] The chromatographic column is used to cooperate with the eluent to separate the components in the sample liquid to be detected;

[0025] The detection device is used to detect the components separated by the chromatographic column.

[0026] In some implementations, the liquid pressure in the pipeline where the exhaust valve is located is the first pressure, and the first pressure is greater than 12 MPa.

[0027] In some implementations, the analyzer further includes a control device, and the control device is communicatively connected to the driving component of the exhaust valve; the control device is configured to:

[0028] In response to the sealing instruction, the control device controls the connection state between the driving component and the valve core to switch from the driving state to the active state, and the valve core seals the exhaust branch through the elastic member;

[0029] In response to the exhaust instruction, the control device controls the connection state between the driving component and the valve core to switch from the active state to the driving state, and controls the driving component to drive the valve core away from the exhaust branch along the first direction to conduct the exhaust branch.

[0030] In some implementations, the triggering conditions of the exhaust instruction include:

[0031] The liquid pressure in the liquid channel is less than the first threshold or the fluctuation amount of the liquid pressure in the liquid channel is greater than the fluctuation threshold.

[0032] In some implementations, the driving component includes a first connecting member and a driving member, the driving member is used to drive the first connecting member to move, the valve core includes a second connecting member, one of the first connecting member and the second connecting member is provided with a connecting hole, and the other is provided with a connecting shaft; the connecting shaft is inserted into the connecting hole, and in the first direction, the connecting hole is an oval hole with a clearance fit with the connecting shaft; a position sensor for detecting whether the valve core reaches the second position is installed on the main body, the distance between the second position and the first position is the first distance, and the exhaust branch is sealed when the valve core is located at the first position;

[0033] Controlling the connection state between the driving component and the valve core to switch from the driving state to the active state includes:

[0034] The control device controls the driving member to drive the first connecting member to move towards the direction close to the exhaust branch, and when the position sensor detects that the valve core reaches the second position, the control device controls the driving member to drive the first connecting member to continue to move a second distance towards the direction close to the exhaust branch, and the second distance is greater than the first distance.

[0035] In some implementations, the difference between the second distance and the first distance is less than or equal to half of the fitting clearance between the first connecting member and the second connecting member.

[0036] In some implementations, after the control device is configured to control the connection state between the driving component and the valve core to switch from the driving state to the active state, the control device controls the driving component to close.

[0037] In some implementations, to switch the connection state between the control driving component and the valve core from the active state to the driving state, and to control the control driving component to drive the valve core away from the exhaust branch along the first direction includes:

[0038] The control device controls the driving member to drive the first connecting member to move in a direction away from the exhaust branch, and when the position sensor detects that the valve core reaches the second position, controls the first connecting member to continue to move a third distance in the direction away from the exhaust branch, and the third distance is greater than the theoretical maximum detection deviation of the position sensor.

[0039] Compared with the prior art, the driving component of the present utility model is connected to the valve core and has a clearance fit in the first direction. The driving component is used to drive the valve core to move linearly, so that the valve core moves away from the exhaust branch to conduct the exhaust branch; only the elastic member provides the sealing force for sealing the exhaust branch by the valve core. With this structure, it is possible to avoid using a threaded knob structure for sealing the exhaust valve, ensure stable sealing of the exhaust valve, and improve the service life of the exhaust valve. At the same time, it is also possible to avoid the driving component directly driving the valve core for sealing, which can avoid the influence of the processing error and installation error of the exhaust valve on the sealing of the exhaust valve, ensure stable sealing, avoid damaging the valve core, and improve the service life of the exhaust valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] The present utility model will be described in more detail below based on embodiments with reference to the drawings.

[0041] Figure 1 is a three-dimensional structural schematic diagram of the exhaust valve when plugging the exhaust branch in the embodiment of the present utility model;

[0042] Figure 2 is a three-dimensional structural schematic diagram of the exhaust valve when the valve core is separated from the exhaust branch in the embodiment of the present utility model;

[0043] Figure 3 is a front view structural schematic diagram of the exhaust valve when plugging the exhaust branch in the embodiment of the present utility model;

[0044] Figure 4 is Figure 3 the cross-sectional structural schematic diagram of the A-A section in

[0045] Figure 5 is Figure 4 the cross-sectional structural schematic diagram of the B-B section in

[0046] Figure 6 is Figure 5 the cross-sectional structural schematic diagram of the C-C section in

[0047] Figure 7 is Figure 5 the partial enlarged structural schematic diagram at D in

[0048] Figure 8 It is a front view structural schematic diagram of the exhaust valve when the valve core disengages from the exhaust branch in the embodiment of the present utility model;

[0049] Figure 9 It is Figure 8 a sectional view structural schematic diagram of the E-E section in;

[0050] Figure 10 It is Figure 9 a sectional view structural schematic diagram of the F-F section in;

[0051] Figure 11 It is Figure 10 a partial enlarged structural schematic diagram at G in;

[0052] Figure 12 It is a pipeline layout schematic diagram of the sample analyzer;

[0053] Figure 13 It is a schematic diagram of the corresponding relationship between the stroke of the first connecting piece and the position of the valve core.

[0054] Reference numerals:

[0055] 100, exhaust valve;

[0056] 110, main body; 111, valve seat; 112, first sleeve; 1121, first mounting through hole; 1122, positioning protrusion; 113, pressure sensor; 114, liquid channel; 1141, first gap; 1142, liquid inlet; 1143, liquid outlet; 115, valve hole; 116, exhaust branch; 1161, exhaust port; 1162, first chamber; 117, first guide sleeve; 118, drain joint;

[0057] 120, valve core; 121, second connecting piece; 1211, connecting shaft; 122, sealing shaft; 123, sealing head; 124, photoelectric baffle;

[0058] 130, elastic member;

[0059] 140, drive assembly; 141, first connecting piece; 1411, connecting hole; 142, drive member; 143, locking member;

[0060] 150, position sensor;

[0061] 160, first sealing ring; 170, second sealing ring;

[0062] 200. Liquid storage device; 300. High-pressure pump; 400. Chromatographic column; 500. Recovery device; 510. Waste liquid buffer bottle; 520. Waste liquid pump; 530. Waste liquid barrel; 600. Rotary injection valve; 610. Quantitative loop; 700. Sieve plate assembly; 800. Detection device; 900. Degasser. Detailed implementation manners

[0063] The present utility model will be further described below in conjunction with the accompanying drawings.

[0064] Most of the existing exhaust valves are sealed by a threaded knob structure, which is prone to damage to the sealing surface or damage to the threads, resulting in sealing failure and a relatively low service life of the exhaust valve. The exhaust valve has a tee structure with a liquid inlet, a liquid outlet, and an exhaust port, and the liquid inlet and the liquid outlet are connected through a liquid channel. When the exhaust valve is in a sealed state, it is necessary to cut off the communication path between the liquid channel and the exhaust port through a seal to prevent the liquid in the liquid channel from flowing to the exhaust port. When the exhaust valve is in an exhaust state, the seal needs to be moved to make the communication path between the liquid channel and the exhaust port connected, and the liquid in the liquid channel is guided to the exhaust port.

[0065] To solve the problems of easy sealing failure and relatively low service life existing in the existing exhaust valve, on the one hand, as shown in Figures 1 - 7 , an exhaust valve 100 is provided in an embodiment of the present application, which includes: a main body 110, a valve core 120, an elastic member 130, and a driving assembly 140.

[0066] A liquid channel 114 (visible in Figure 5 and Figure 6 ) and an exhaust branch 116 communicating with the liquid channel 114 (visible in Figure 5 and Figure 7 ) are provided in the main body 110.

[0067] The valve core 120 is movably installed in the main body 110 and is used to conduct or seal the exhaust branch 116;

[0068] The driving assembly 140 is used to drive the valve core 120 to move linearly, so that the valve core 120 moves away from the exhaust branch 116, conducts the exhaust branch 116, and enables the liquid or gas in the liquid channel 114 to flow into the exhaust branch 116.

[0069] Among them, the driving assembly 140 is connected to the valve core 120 and in the first direction ( Figure 3A clearance fit is provided in the left - right direction (in the figure), so that the connection state between the driving component 140 and the valve core 120 includes two states: a driving state and a movable state. The driving state means that the driving component 140 is in contact with the valve core 120, and the movement of the driving component 140 can make the valve core 120 move synchronously. The movable state means that there is a gap between the driving component 140 and the valve core 120, and they are not in contact, and the valve core 120 will not move due to the movement of the driving component 140.

[0070] The elastic component 130 is configured to push the valve core 120 towards the exhaust branch 116 along the first direction. When the connection state between the driving component 140 and the valve core 120 is in the movable state, the elastic component 130 is used to provide a sealing force for the valve core 120 to seal the exhaust branch 116.

[0071] In the above solution, the driving component 140 is connected to the valve core 120 and has a clearance fit in the first direction. The driving component 140 is used to drive the valve core 120 to move linearly, so that the valve core 120 moves away from the exhaust branch 116 to conduct the exhaust branch 116; only the elastic component 130 provides the sealing force for the valve core 120 to seal the exhaust branch 116. This can avoid using a threaded knob structure for sealing the exhaust valve, ensure the stable sealing of the exhaust valve, and improve the service life of the exhaust valve.

[0072] Moreover, adopting the above solution can also avoid the driving component 140 directly driving the valve core 120 for sealing. Due to the machining error and installation error of the exhaust valve, there will be a deviation between the actual required movement stroke for the valve core 120 to seal the exhaust branch 116 and the theoretically required movement stroke, that is, it is easy to cause the driving stroke of the driving component 140 to be greater than or less than the actual required movement stroke for the valve core 120 to seal the exhaust branch 116. If the driving component 140 directly drives the valve core 120 to seal the exhaust branch 116, it is easy to cause the valve core 120 to either fail to achieve sealing or the sealing force of the valve core 120 is too large, resulting in easy damage to the valve core 120. In this application, when the connection state between the driving component 140 and the valve core 120 is in the movable state, the sealing force for the valve core 120 to seal the exhaust branch 116 is only provided by the elastic component 130, which can avoid the influence of the machining error and installation error of the exhaust valve on the sealing of the exhaust valve, ensure stable sealing while avoiding damage to the valve core 120, and improve the service life of the exhaust valve.

[0073] Furthermore, since there is a clearance fit between the driving component 140 and the valve core 120, when using the valve core 120 to seal the exhaust branch 116, the driving component 140 in the driving state can make the valve core 120 move relatively smoothly to the sealing position to seal the exhaust branch 116, avoiding the valve core 120 being driven by the elastic force of the elastic component 130 to hit the exhaust branch 116 too quickly. This not only reduces the impact noise during sealing but also avoids the valve core 120 being easily damaged due to hitting the exhaust branch 116, thus improving the service life of the exhaust valve.

[0074] That is to say, through the cooperation of the driving component 140 and the elastic component 130 in the present application, the sealing force of the valve core 120 can be provided only by the elastic component 130, with a more stable sealing force, ensuring the sealing effect. Moreover, the moving speed of the valve core 120 during sealing is slowed down, the sealing noise is reduced, and the service life of the exhaust valve is extended.

[0075] In some implementation manners, the driving component 140 includes a first connecting member 141 and a driving member 142. The first connecting member 141 is connected to the driving member 142, and the driving member 142 is used to drive the first connecting member 141 to move linearly. The valve core 120 includes a second connecting member 121. One of the first connecting member 141 and the second connecting member 121 is provided with a connecting hole 1411, and the other is provided with a connecting shaft 1211. The connecting shaft 1211 is inserted into the connecting hole 1411, and in the first direction, the connecting hole 1411 is a kidney-shaped hole with a clearance fit with the connecting shaft 1211.

[0076] As Figure 5 shown, in some embodiments, the connecting hole 1411 is provided on the first connecting member 141, and the connecting shaft 1211 is provided on the second connecting member 121.

[0077] With the first connecting member 141 and the second connecting member 121 having the above structure, during the process of the exhaust valve 100 changing from the exhaust mode to the sealing mode, the driving member 142 drives the first connecting member 141 to move, causing the second connecting member 121 to move in the direction close to the exhaust branch 116. Under the action of the elastic component 130, the connecting shaft 1211 of the second connecting member 121 will always be in tight contact with the hole wall of the first end ( Figure 5 the right end in

[0078] this) of the connecting hole 1411 of the first connecting member 141. Here, the first end of the connecting hole 1411 is the end close to the exhaust branch 116. At this time, due to the limitation of the connecting hole 1411, the position of the valve core 120 is determined by the position of the first connecting member 141, and the connection state between the driving component 140 and the valve core 120 is in the driving state.

[0079] Similarly, during the process of the exhaust valve 100 transitioning from the sealing mode to the exhaust mode, the connection state between the driving assembly 140 and the valve core 120 will switch from the movable state to the driving state. Since the connection hole 1411 and the connection shaft 1211 have a clearance fit, allowing for a certain amount of error during the movement of the first connecting member 141, the requirements for installation accuracy and driving accuracy are reduced.

[0080] It can be understood that in other embodiments, the connection hole 1411 can also be provided on the second connecting member 121, and the connection shaft 1211 can be provided on the first connecting member 141.

[0081] Compared with other clearance fit structures, the kidney-shaped hole structure is not only easier to implement and has a lower cost, but also when the connection state between the driving assembly 140 and the valve core 120 is in the driving state, it can make the side wall of the connection shaft 1211 in the direction perpendicular to the first direction always fit with the side wall of the connection hole 1411 in the direction perpendicular to the first direction, providing a greater transmission force in the driving state and having less requirements for the installation space.

[0082] In some implementation manners, the driving member 142 can adopt a lead screw motor to drive the valve core 120 to move linearly in an electric control manner. The lead screw motor not only has a high control accuracy but also can provide sufficient driving force, and can overcome the elastic force of the elastic member 130 when driving the first connecting member 141 to move.

[0083] In other implementation manners, the driving member 142 can also be a driving component such as a link mechanism or a cam mechanism that can drive the first connecting member 141 to perform reciprocating linear motion.

[0084] Such as Figure 4 and Figure 5 As shown, in this embodiment, the driving member 142 includes a power output shaft, and the driving member 142 is connected to the first connecting member 141 through its power output shaft. A locking member for defining the axial position of the first connecting member 141 is provided on the power output shaft. Specifically, an external thread is provided on the power output shaft of the driving member 142, and an internal thread is provided at the end of the first connecting member 141. The first connecting member 141 is threadedly connected to the power output shaft of the driving member 142. The locking member can be a lock nut, which is threadedly installed on the power output shaft of the driving member 142. By making the lock nut abut against the end face of the first connecting member 141, the relative axial movement of the first connecting member 141 with respect to the power output shaft is restricted, thereby realizing the locking of the first connecting member 141.

[0085] In order to more clearly show the structure of the power output shaft of the driving member 142, the first connecting member 141 in the attached drawing has not been connected to the driving member 142. During actual use, the first connecting member 141 needs to be connected to the driving member 142, so as to drive the first connecting member 141 to move by the drive of the driving member 142.

[0086] During use, the first connecting member 141 can be first installed on the power output shaft of the driving member 142, and the orientation of the connecting hole 1411 can be adjusted by rotating the first connecting member 141. After the installation direction of the first connecting member 141 is determined (the axis of the connecting hole 1411 coincides with the axis of the first installation through hole 1121), the first connecting member 141 is locked by the locking member 143. The first connecting member 141 can then linearly move under the drive of the driving member 142 without rotating, preventing the connecting shaft 1211 and the connecting hole 1411 from deflecting and preventing the valve core 120 from rotating, thus affecting the detection of the subsequent position sensor 150.

[0087] In other implementation manners, the locking member 143 can also be a locking tongue mechanism. After the first connecting member 141 rotates in place, the locking member 143 locks the first connecting member 141 on the power output shaft of the driving member 142, preventing the first connecting member 141 from moving relative to the power output shaft of the driving member 142. Here, the specific structure of the locking member 143 is not limited, as long as it can satisfy the locking operation of the first connecting member 141.

[0088] As Figure 5 、 Figure 6 and Figure 7 shown, in some implementation manners, the main body 110 includes a valve seat 111 and a pressure sensor 113. The pressure sensor 113 is hermetically connected to the valve seat 111, and the pressure detection end face of the pressure sensor 113 and the valve seat 111 define a first gap 1141 (which can be seen in detail in Figure 7 and Figure 11 ). The valve seat 111 is provided with a liquid inlet 1142 and a liquid outlet 1143 that communicate with the first gap 1141. And the exhaust branch 116 is connected to the first gap 1141. The first gap 1141, the liquid outlet 1143, and the liquid inlet 1142 together form a liquid passage 114.

[0089] That is to say, during the process of liquid flowing in from the liquid inlet 1142 and flowing out from the liquid outlet 1143, it will flow through the first gap 1141, and a part of the first gap 1141 is defined by the pressure detection end face of the pressure sensor 113. During the process of liquid passing through the exhaust valve 100, the pressure sensor 113 can detect the pressure of the liquid. Moreover, compared with additionally providing a detection branch on the liquid passage for the pressure sensor 113 to detect, directly defining a partial area of the liquid passage by the pressure detection end face of the pressure sensor 113 shortens the length of the liquid path and can effectively reduce the dead volume of the pipeline.

[0090] Specifically, at one end of the valve seat 111 away from the driving assembly 140 ( Figure 4A first stepped hole is provided at the right end of

[0091] In this embodiment, a second sealing ring 170 is embedded in the first stepped hole of the valve seat 111. The pressure sensor 113 is hermetically connected to the valve seat 111 through the second sealing ring 170. The second sealing ring 170 can be made of PTFE (polytetrafluoroethylene), which has good sealing performance, manufacturability, low price, high chemical compatibility and stability. By applying a certain torque to the pressure sensor 113 to drive the axial movement of the pressure sensor 113, the second sealing ring 170 is compressed, and reliable sealing of 20 MPa for the exhaust valve can be achieved.

[0092] See Figure 5 、 Figure 6 and Figure 7 As shown in Figure 7 the structure of the exhaust branch 116 when the valve core 120 blocks the valve hole 115 is shown. Figure 10 The structure of the exhaust branch 116 when the valve core 120 is separated from the valve hole 115 is shown. The opening and closing of the valve hole 115 can be controlled by the valve core 120 to realize the conduction or closing of the exhaust branch 116. When the valve core 120 moves to the sealing position, the valve core 120 fits with the hole wall of the valve hole 115 to realize the sealing of the exhaust branch 116.

[0093] Among them, the valve hole 115 is communicated with the first gap 1141. When the valve hole 115 is opened or closed, the pressure sensor 113 at the first gap 1141 can be used to timely measure the pressure change in the liquid channel 114.

[0094] In some embodiments, the valve core 120 includes a sealing shaft 122 and a sealing head 123. The sealing shaft 122 is sealingly connected to the accommodating cavity to form a first chamber 1162. The sealing head 123 is disposed at one end of the sealing shaft 122 close to the valve hole 115 and protrudes from the end face of the sealing shaft 122. The sealing head 123 is made of engineering plastic, which has excellent wear resistance and machinability, is convenient for processing, and has a long service life. At the same time, the engineering plastic can meet the requirements of reagent compatibility, avoiding reaction when the sealing head 123 is in long-term contact with the liquid (such as eluent) in the exhaust branch 116. In addition, the engineering plastic has a certain amount of elastic deformation and can elastically deform under pressure, so that the sealing surface of the sealing head 123 is closely attached to the sealing surface of the valve hole 115, and it can be leak-proof under a pressure of 20 MPa. The engineering plastic is preferably PEEK (polyetheretherketone) material. Of course, the sealing head 123 can also be made of POM (polyoxymethylene resin) material.

[0095] Preferably, the outer diameter of the sealing head 123 is smaller than the outer diameter of the sealing shaft 122, so that the contact surface between the sealing head 123 and the end face of the valve hole 115 is as small as possible, which can increase the sealing pressure of the sealing head 123 on the end face of the valve hole 115, so that the driving assembly 140 with a smaller driving force and the elastic member 130 with a smaller sealing force can complete the sealing work of the valve core 120; at the same time, the compression amount of the sealing head 123 can be increased to eliminate the contact gap between the sealing head 123 and the valve hole 115 to ensure the sealing of the exhaust branch 116.

[0096] See Figure 7 As shown, the sealing head 123 can block the valve hole 115 in a plane sealing manner. It can be understood that the sealing head 123 with a conical sealing structure or a spherical sealing structure can also be used to block the valve hole 115 to achieve the sealing of the exhaust branch 116.

[0097] In some implementation manners, a first guide sleeve 117 is installed in the accommodating cavity formed by the valve seat 111, and the valve core 120 includes a sealing shaft 122 that is sealingly inserted into the first guide sleeve 117. The sealing shaft 122 has a stepped shaft structure, and one end of the sealing shaft 122 close to the valve hole 115 extends out of the first guide sleeve 117 and forms a first chamber 1162 with the inner wall of the accommodating cavity. The structure of the first chamber 1162 can refer to Figure 7 and Figure 11 . In order to prevent the liquid from flowing out through the gap between the sealing shaft 122 and the accommodating cavity, a first sealing ring 160 is provided between the sealing shaft 122 and the accommodating cavity. The first sealing ring 160 between the sealing shaft 122 and the accommodating cavity can be made of fluororubber material. The first guide sleeve 117 can be made of tin bronze to enable precise sliding fit between the first guide sleeve 117 and the valve core 120.

[0098] See Figure 4 andFigure 5 As shown, the main body 110 further includes a first sleeve 112. The first sleeve 112 is detachably connected to the valve seat 111, and a positioning protrusion 1122 is provided inside the first sleeve 112. The elastic member 130 is installed in the first sleeve 112. One end of the elastic member 130 abuts against the valve core 120, and the other end abuts against the positioning protrusion 1122. Since the end of the elastic member 130 away from the valve core 120 abuts against the positioning protrusion 1122, when the valve core 120 moves to the first position, that is, to the sealing position, the length of the elastic member 130 is equal to the distance between the positioning protrusion 1122 and the valve core 120. The position of the positioning protrusion 1122 is fixed, and the position of the sealing position is fixed. That is to say, every time the valve core 120 moves to the sealing position, the length of the elastic member 130 is the same, that is, the elastic member 130 can provide a stable pushing force for the valve core 120. In this embodiment, the elastic member 130 is a high-performance compression spring with a long service life.

[0099] As Figure 4 and Figure 5 shown, one end of the sealing shaft 122 of the valve core 120 forms a second connecting member, and the end of the elastic member 130 away from the positioning protrusion 1122 abuts against the second connecting member. When the first sleeve 112 is connected to the valve seat 111, due to the limitation of the internal chamber structure of the main body 110, the elastic member 130 is always in a compressed state.

[0100] Wherein, a first mounting through hole 1121 for the connecting shaft 1211 to pass through is provided on the first sleeve 112.

[0101] Referring to Figure 3 and Figure 8 shown, in some implementation manners, the exhaust valve further includes a position sensor 150.

[0102] The position sensor 150 is used to detect whether the valve core 120 reaches the second position. When the valve core 120 reaches the second position, the exhaust branch 116 is conducted. The distance between the first position (i.e., the above-mentioned sealing position) and the second position is the first distance. The first position refers to the position of the valve core 120 when the valve core 120 seals the exhaust branch 116.

[0103] By detecting whether the valve core 120 reaches the second position through the position sensor 150, when the position sensor 150 measures that the valve core 120 reaches the second position, the first connecting member 141 can be controlled to move further in the direction close to the exhaust branch 116 by a second distance greater than the first distance, ensuring that the valve core 120 reaches the first position to seal the exhaust branch 116.

[0104] It can be understood that the detection of whether the valve core 120 reaches the first position has high requirements for the assembly accuracy. Slight deviation in the installation position of the position sensor 150 or slight deviation in the position of the valve hole 115 will cause the first position to change. This configuration method of the position sensor has high requirements for the installation accuracy and the accuracy of the sensor. Even if the valve core 120 reaches the first position, the marker on the valve core 120 may still not be within the detection range of the position sensor device due to slight deviation, making it difficult to meet the detection of the sealing state of the exhaust valve 100.

[0105] In this application, a position sensor 150 is provided to detect whether the valve core 120 reaches the second position. When the valve core 120 is in the second position, the exhaust branch 116 is conducted. When the position sensor 150 detects that the valve core 120 reaches the second position, the first connecting piece 141 is controlled to continue moving a second distance greater than the first distance in the direction close to the exhaust branch 116, so that the valve core 120 reaches the first position to achieve the sealing of the exhaust branch 116, reducing the requirements for the assembly accuracy and the machining accuracy.

[0106] As Figure 1 、 Figure 2 and Figure 8 shown, in the embodiment of this application, the position sensor 150 includes a photoelectric sensor installed on the main body 110. A photoelectric baffle 124 is connected to the valve core 120, and the position information of the valve core 120 is obtained by detecting the position of the photoelectric baffle 124 through the position sensor 150. Comparing Figure 3 with Figure 8 it can be seen that when the valve core 120 blocks the valve hole, the photoelectric baffle 124 is basically blocked by the position sensor 150, while when the valve core 120 disengages from the valve hole 115 ( Figure 8 in), obviously a part of the photoelectric baffle 124 extends out of the position sensor 150. When the position sensor 150 is a photoelectric sensor, the second position is the critical point of the presence or absence of the photoelectric detection signal. When the exhaust valve switches from the sealing mode to the exhaust mode, the photoelectric detection signal of the position sensor 150 changes from having to not having; when the exhaust valve switches from the exhaust mode to the sealing mode, the photoelectric detection signal of the position sensor 150 changes from not having to having.

[0107] In other implementation manners, the position sensor 150 may include a laser emitter and a laser receiver. By installing the laser emitter on the valve core 120 and the laser receiver on the main body 110, it is possible to detect whether the valve core 120 is in the second position. Alternatively, the position sensor 150 may further include a color mark sensor, and a sensitive mark is set on the valve core 120, and the position information of the valve core 120 is judged according to the color information recognized by the color mark sensor. The type and detection method of the position sensor 150 here can be adjusted according to the actual situation. The position sensor 150 may further include a travel switch installed on the main body 110, and the travel switch is used to detect whether the valve core 120 reaches the second position. That is, the position sensor 150 is not limited to the detection method by the photoelectric sensor.

[0108] As Figure 1 and Figure 2 shown, in some implementation manners, a detection hole is formed in the main body 110, and the photoelectric baffle 124 can extend out of the main body 110 through the detection hole, so that the position sensor 150 located outside the main body 110 can detect the photoelectric baffle 124. Compared with installing the position sensor 150 inside the main body 110, the volume of the inner chamber of the main body 110 is reduced, which is beneficial to the miniaturization of the exhaust valve 100. And it is more convenient to connect various power lines and signal lines of the position sensor 150.

[0109] In a second aspect, as Figure 12 shown, the present application further provides a sample analyzer, which includes a liquid storage device 200, a high-pressure pump 300, a chromatographic column 400, a detection device 800, a recovery device 500, and any one of the above exhaust valves 100.

[0110] The high-pressure pump 300 is used to pump the eluent in the liquid storage device 200 into the chromatographic column 400 through the liquid channel 114 of the exhaust valve 100. The recovery device 500 is communicated with the exhaust branch 116 of the exhaust valve 100. The chromatographic column 400 is used to cooperate with the eluent to separate the components in the sample liquid to be measured; the detection device 800 is used to detect the components separated by the chromatographic column 400, and the detection device 800 is communicated with the recovery device 500.

[0111] As Figure 1 and Figure 2 shown, the main body 110 of the exhaust valve 100 further includes an emptying joint 118, and the emptying joint 118 is communicated with the exhaust port 1161. During use, the emptying joint 118 can be communicated with the recovery device 500, so that the liquid discharged from the exhaust port 1161 is introduced into the recovery device 500 for recovery.

[0112] In some embodiments, the recovery device 500 includes a waste liquid buffer bottle 510, a waste liquid pump 520, and a waste liquid barrel 530 that are connected in sequence. The waste liquid derived from the exhaust branch 116 of the exhaust valve 100 first leads to the waste liquid buffer bottle 510, and then the waste liquid pump 520 is used to drain the waste liquid collected in the waste liquid buffer bottle 510 into the waste liquid barrel 530.

[0113] As Figure 12 shown, in some implementation manners, a rotary injection valve 600 and a sieve plate assembly 700 are provided between the chromatographic column 400 and the exhaust valve 100. A quantitative loop 610 is provided in the rotary injection valve 600, which can realize the function of quantifying the sample liquid to be measured. The quantitative loop 610 can be communicated with the liquid outlet of the exhaust valve 100. The high-pressure pump pumps the eluent into the chromatographic column through the exhaust valve 100 and the quantitative loop 610. At the same time, the eluent can bring the sample liquid to be measured in the quantitative loop into the chromatographic column together. The eluent and the sample liquid to be measured can be filtered through the sieve plate assembly 700 to prevent foreign substances from flowing into the chromatographic column 400 and damaging the chromatographic column 400.

[0114] Refer to Figure 12 shown, in some implementation manners, the sample analyzer has two liquid storage devices 200 for storing different types of eluents. The two liquid storage devices 200 are connected to the high-pressure pump 300 through a three-way valve. The three-way valve can control which liquid storage device 200 is connected to the high-pressure pump 300. Specifically, the three-way valve can be an electrically controlled three-way valve.

[0115] When exhausting is required, the driving assembly 140 will move the valve core 120 of the exhaust valve 100 away from the valve hole 115, and the liquid channel 114 will be communicated with the exhaust branch 116 through the valve hole 115. The high-pressure eluent will be guided to the recovery device 500 through the exhaust branch 116 under the action of the pressure difference.

[0116] The driving assembly 140 is connected to the valve core 120 and has a clearance fit in the first direction. The driving assembly 140 is used to drive the valve core 120 to move linearly, so that the valve core 120 moves away from the exhaust branch 116 to conduct the exhaust branch 116; only the elastic member 130 provides the sealing force for the valve core 120 to seal the exhaust branch 116. The use of a threaded knob structure for sealing the exhaust valve can be avoided, ensuring the stable sealing of the exhaust valve and improving the service life of the exhaust valve.

[0117] Moreover, by adopting the above solution, it is also possible to prevent the driving component 140 from directly driving the valve core 120 for sealing, which may result in either the valve core 120 failing to achieve sealing or the sealing force of the valve core 120 being too large, leading to easy damage to the valve core 120. In this application, when the connection state between the driving component 140 and the valve core 120 is in an active state, the sealing force for the valve core 120 to seal the exhaust branch 116 is only provided by the elastic member 130, which can avoid the influence of the processing error and installation error of the exhaust valve on the sealing of the exhaust valve. While ensuring stable sealing, it can avoid damaging the valve core 120 and improve the service life of the exhaust valve.

[0118] Furthermore, since no sealing force needs to be provided by the driving component 140 when blocking the valve hole 115, the driving component 140 can be turned off after switching the connection state between the driving component 140 and the valve core 120 from the driving state to the active state. That is, it can extend the service life of the driving component 140 and also prevent the driving component 140 from heating the eluent in the liquid channel 114 during long-term operation, avoiding the increase in the temperature of the eluent and affecting the separation and detection of the subsequent sample liquid to be measured, and ensuring the accuracy of the detection result.

[0119] As Figure 12 shown, in some implementation manners, the liquid pressure in the pipeline where the exhaust valve 100 is located is the first pressure, and the first pressure is greater than 12 MPa. Preferably, the first pressure is 12 MPa - 20 MPa. In order to reduce the influence of gas in the eluent on the detection, in some embodiments, a degasser 900 is further provided between the high-pressure pump 300 and the liquid storage device 200.

[0120] In some implementation manners, the sample analyzer further includes a control device, and the control device is communicatively connected to the driving component 140 of the exhaust valve 100.

[0121] The control device is configured to: in response to a sealing instruction, the control device controls the connection state between the driving component 140 and the valve core 120 to switch from the driving state to the active state, and the valve core 120 blocks and seals the exhaust branch through the elastic member 130; in response to an exhaust instruction, the control device controls the connection state between the driving component 140 and the valve core 120 to switch from the active state to the driving state, and controls the driving component 140 to drive the valve core 120 away from the exhaust branch along the first direction to conduct the exhaust branch 116.

[0122] The start and stop of the driving component 140 can be controlled by a control device, and the connection state between the driving component 140 and the valve core 120 can be controlled by the control device. When normal detection does not require exhaust, the exhaust valve is controlled to block the valve hole 115 to prevent the eluent from flowing out of the exhaust port 1161. When exhaust is required, the exhaust valve is used for exhaust. The driving component 140 is switched from the inactive state to the driving state by the control device, and the valve core 120 is driven by the driving component 140 to move away from the exhaust branch 116, so that the eluent and air bubbles in the liquid channel 114 are discharged from the exhaust port.

[0123] In some implementation manners, the triggering conditions of the exhaust instruction include: the liquid pressure in the liquid channel 114 is less than the first threshold or the fluctuation amount of the liquid pressure in the liquid channel 114 is greater than the fluctuation threshold. That is to say, as long as one of the pipeline pressure and the fluctuation amount of the pipeline pressure does not meet the requirements, an exhaust instruction will be issued.

[0124] For example, when the pressure of the eluent is too small, the control device controls the driving component 140 to separate the valve core 120 from the valve hole 115, and when the pressure fluctuation of the eluent is abnormal, the control device controls the driving component 140 to separate the valve core 120 from the valve hole 115.

[0125] Among them, when air bubbles are generated in the eluent, the situation that the pressure of the eluent is too small or the pressure fluctuation of the eluent occurs. In this application, when it is detected that the pressure of the eluent is too small and the pressure fluctuation of the eluent is too large, the exhaust branch 116 is conducted, and the air bubbles in the eluent can be smoothly discharged from the exhaust branch 116. Of course, the triggering adjustment of the exhaust instruction can also be other abnormal situations that do not meet the detection requirements. For example, when the instrument recognizes that a new eluent has been replaced, an exhaust instruction can also be triggered and generated.

[0126] It should be noted that the first threshold and the fluctuation threshold of different sample analyzers may vary and need to be set according to specific situations. The first threshold and the fluctuation threshold are not specifically limited herein.

[0127] The driving component 140 includes a first connecting member 141 and a driving member 142. The driving member 142 is used to drive the first connecting member 141 to move. The valve core 120 includes a second connecting member. One of the first connecting member 141 and the second connecting member is provided with a connecting hole, and the other is provided with a connecting shaft; the connecting shaft is inserted into the connecting hole, and in the first direction, the connecting hole is a waist-shaped hole with a clearance fit with the connecting shaft; a position sensor for detecting whether the valve core 120 reaches the second position is installed on the main body. The distance between the second position and the first position is the first distance. When the valve core 120 is located at the first position, the exhaust branch is sealed;

[0128] Controlling the connection state between the driving component 140 and the valve core 120 to be switched from the driving state to the inactive state includes:

[0129] The control device controls the driving member 142 to drive the first connecting member 141 to move towards the exhaust branch, and when the position sensor detects that the valve core 120 reaches the second position, the control device controls the driving member 142 to drive the first connecting member 141 to continue moving towards the exhaust branch by a second distance, and the second distance is greater than the first distance.

[0130] It can be understood that since the first connecting member 141 and the second connecting member 121 are in a clearance fit hole-shaft connection, and the elastic member 130 is used to push the valve core 120 towards the exhaust branch 116 along the first direction, when the valve core 120 disengages from the first position, the connecting shaft 1211 must be in contact with the end wall of the connecting hole 1411. That is to say, when the position sensor 150 detects that the valve core 120 reaches the second position, the first connecting member 141 and the second connecting member 121 are in a tightly connected state, that is, in a driving state. At this time, the movement of the first connecting member 141 can drive the second connecting member 121 to move synchronously.

[0131] As the first connecting member 141 continues to move towards the exhaust branch 116, the valve core 120 will also gradually approach the exhaust branch 116. And after the valve core 120 reaches the first position and the first connecting member 141 continues to move, in fact, no force is transmitted between the first connecting member 141 and the second connecting member 121. The connection state between the driving assembly 140 and the valve core 120 is switched to the active state. In order to avoid the influence of detection errors of the position sensor 150, machining errors of the exhaust valve, installation errors, etc., during the movement of the first connecting member 141, its movement distance is set to a second distance greater than the first distance, so as to switch the connection state between the driving assembly 140 and the valve core 120 to the active state, so that there is no relative acting force between the connecting shaft and the waist-shaped hole, ensuring that when the valve core 120 has moved to the first position, the exhaust branch 116 is sealed.

[0132] In some implementation manners, the difference between the second distance and the first distance ( Figure 13 L4 in it) is less than half of the fit clearance between the first connecting member 141 and the second connecting member 121, that is, the second distance is: the sum of half of the fit clearance between the first connecting member 141 and the second connecting member 121 and the first distance, which can avoid excessive movement of the first connecting member 141 resulting in the right end of the connecting shaft being in contact with the connecting hole. And it is necessary to make the clearance between the connecting shaft located in the connecting hole and the left end or the right end of the connecting hole greater than the theoretical maximum detection error of the position sensor 150.

[0133] Preferably, the difference between the second distance and the first distance is equal to half of the clearance between the first connecting member 141 and the second connecting member. This can not only ensure that the connection state between the driving assembly 140 and the valve core 120 is switched to the active state, but also enable the connecting shaft to move approximately to the middle position of the connecting hole, leaving gaps on both sides of the connecting shaft 1211. This can better ensure that the left end hole wall of the connecting hole will not be pressed against the connecting shaft during the process of moving the first connecting member 141.

[0134] In some implementation manners, after the control device is configured to control the connection state between the driving assembly 140 and the valve core 120 to be switched from the driving state to the active state, the control device controls the driving assembly 140 to close.

[0135] Since the exhaust valve 100 seals the exhaust branch 116, the sealing force is provided by the elastic member 130. When exhaust is not required, the driving member 142 of the driving assembly 140 can be closed. Even after long-term use, it is only necessary to briefly start the driving assembly 140 during exhaust. Since the start-up time of the driving assembly 140 is short, it basically will not cause the temperature of the eluent in the liquid channel 114 to rise, and it can avoid the temperature rise of the eluent from affecting the separation and detection of the subsequent sample to be tested, ensuring the accuracy of the detection result.

[0136] In some implementation manners, controlling the connection state between the driving assembly 140 and the valve core 120 to be switched from the active state to the driving state, and controlling the driving assembly 140 to drive the valve core 120 away from the exhaust branch along the first direction includes:

[0137] The control device controls the driving member 142 to drive the first connecting member 141 to move in a direction away from the exhaust branch, and when the position sensor detects that the valve core 120 reaches the second position, the control device controls the first connecting member 141 to continue to move a third distance in the direction away from the exhaust branch, and the third distance is greater than the theoretical maximum detection deviation of the position sensor.

[0138] Due to the possible error in the detection of the position sensor, when the position sensor detects the valve core 120, the valve core 120 may not necessarily have reached the second position, nor necessarily have been out of the state of sealing the exhaust branch 116, and the detection signal of the position sensor may be unstable. To ensure that the valve core 120 is out of the exhaust branch 116 and outputs a stable detection signal, when the position sensor detects the valve core 120, the first connecting member 141 will continue to move away from the exhaust branch 116, thereby driving the valve core 120 to continue to move away from the exhaust branch 116. After the first connecting member 141 continues to move a third distance greater than the theoretical maximum detection deviation, the detection error of the position sensor can be eliminated, ensuring that the valve core 120 is in the state of conducting the exhaust branch 116 and outputting a stable detection signal.

[0139] For easy understanding, reference can be made toFigure 13 As shown in the figure. The first position is the position of the valve core 120 when the valve core 120 seals the exhaust branch 116, and the second position is the position of the valve core 120 when the position sensor detects the valve core 120. The distance between the first position and the second position is the first distance (L1).

[0140] When the control device receives the sealing instruction, it will first use the driving component 140 to move the valve core 120 to the second position. When the valve core 120 moves to the second position and is detected by the position sensor, the control driving member 142 drives the first connecting member 141 to move a second distance (L2) in the direction close to the exhaust branch 116, so that the connection state between the driving component 140 and the valve core 120 is switched from the driving state to the active state, so that the valve core 120 is only maintained at the first position under the action of the elastic member 130, and the exhaust branch 116 is blocked and sealed.

[0141] When the control device receives the exhaust instruction, it will drive the first connecting member 141 away from the exhaust branch 116 by using the driving member 142, so as to move the valve core 120 to the second position and be detected by the position sensor, and then continue to drive the first connecting member 141 to move a third distance (L3) to ensure that the valve core 120 is away from the first position, realize the conduction of the exhaust branch 116, and output a stable detection signal.

[0142] Although the present invention has been described with reference to the preferred embodiments, various improvements can be made to it and components therein can be replaced with equivalents without departing from the scope of the present invention. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way. The present invention is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. An exhaust valve, characterized in that, It includes: A main body, in which a liquid passage and an exhaust branch communicating with the liquid passage are provided; A valve core, which is movably installed in the main body and is used to conduct or seal the exhaust branch; A driving assembly, which is used to drive the valve core to move linearly so that the valve core moves away from the exhaust branch to conduct the exhaust branch; the driving assembly is connected to the valve core and has a clearance fit in the first direction, so that the connection state between the driving assembly and the valve core includes two states: a driving state and a movable state; An elastic member, configured to push the valve core toward the exhaust branch along the first direction. When the connection state between the driving assembly and the valve core is in the movable state, the elastic member is used to provide a sealing force for the valve core to seal the exhaust branch.

2. The exhaust valve according to claim 1, characterized in that The driving assembly includes a first connecting member and a driving member, the first connecting member is connected to the driving member, and the driving member is used to drive the first connecting member to move; The valve core includes a second connecting member; One of the first connecting member and the second connecting member is provided with a connecting hole, and the other is provided with a connecting shaft; The connecting shaft is inserted into the connecting hole, and in the first direction, the connecting hole is an oval hole with a clearance fit with the connecting shaft.

3. The exhaust valve according to claim 2, characterized in that The driving member is a lead screw motor.

4. The exhaust valve according to claim 1, characterized in that The main body includes a valve seat and a pressure sensor. The pressure sensor is hermetically connected to the valve seat, and a first gap is defined between the pressure detection end face of the pressure sensor and the valve seat. The valve seat is provided with a liquid outlet, a liquid inlet communicating with the first gap, and the exhaust branch is connected to the first gap. The first gap, the liquid outlet and the liquid inlet together form the liquid passage.

5. The exhaust valve according to claim 1, characterized in that The main body includes a valve seat, and the valve seat is formed with a valve hole and a receiving cavity that are sequentially communicated with the liquid passage. The valve core is installed in the receiving cavity, and a first chamber is formed between the outer wall of the valve core and the inner wall of the receiving cavity. The valve seat is provided with an exhaust port communicating with the first chamber. The valve hole, the first chamber and the exhaust port form the exhaust branch.

6. The exhaust valve according to claim 5, characterized in that The valve core includes a sealing shaft and a sealing head. The sealing shaft is hermetically connected to the receiving cavity to form the first chamber. The sealing head is arranged at one end of the sealing shaft close to the valve hole and protrudes from the end face of the sealing shaft. The sealing head is made of engineering plastic.

7. The exhaust valve according to claim 5, characterized in that The main body further includes a first sleeve, the first sleeve is detachably connected to the valve seat, and a positioning protrusion is arranged in the first sleeve. The elastic member is installed in the first sleeve, one end of the elastic member abuts against the end face of the valve core, and the other end abuts against the positioning protrusion.

8. The exhaust valve according to claim 1, characterized in that When the valve core seals the exhaust branch, the valve core is located at the first position; The exhaust valve further includes a position sensor for detecting whether the valve core reaches a second position. When the valve core is in the second position, the exhaust branch is conducted, and the distance between the first position and the second position is a first distance.

9. A sample analyzer, characterized in that, It includes a recovery device and a liquid storage device, a high-pressure pump, an exhaust valve, a chromatographic column, and a detection device that are connected in sequence; The high-pressure pump is configured to pump the eluent in the liquid storage device into the chromatographic column through the liquid channel of the exhaust valve, and the exhaust valve is the exhaust valve according to any one of claims 1-8; The recovery device is connected to the exhaust branch of the exhaust valve; The chromatographic column is used to cooperate with the eluent to separate the components in the sample liquid to be measured; The detection device is used to detect the components separated by the chromatographic column.

10. The sample analyzer according to claim 9, characterized in that: The liquid pressure in the pipeline where the exhaust valve is located is a first pressure, and the first pressure is greater than 12 MPa.

11. The sample analyzer according to claim 9, wherein: The analyzer further includes a control device, and the control device is communicatively connected to the driving component of the exhaust valve; the control device is configured as: In response to a sealing instruction, the control device controls the connection state between the driving component and the valve core to switch from a driving state to an active state, and the valve core seals the exhaust branch through an elastic member; In response to an exhaust instruction, the control device controls the connection state between the driving component and the valve core to switch from an active state to a driving state, and controls the driving component to drive the valve core away from the exhaust branch in a first direction to conduct the exhaust branch.

12. The sample analyzer according to claim 11, characterized in that, The triggering conditions of the exhaust instruction include: The liquid pressure in the liquid channel is less than a first threshold or the fluctuation amount of the liquid pressure in the liquid channel is greater than a fluctuation threshold.

13. The sample analyzer according to claim 11, characterized in that The driving component includes a first connecting member and a driving member for driving the first connecting member to move. The valve core includes a second connecting member. One of the first connecting member and the second connecting member is provided with a connecting hole, and the other is provided with a connecting shaft; the connecting shaft is inserted into the connecting hole, and in the first direction, the connecting hole is a kidney-shaped hole with a clearance fit with the connecting shaft; a position sensor for detecting whether the valve core reaches the second position is installed on the main body. The distance between the second position and the first position is a first distance. When the valve core is in the first position, the exhaust branch is sealed; Controlling the connection state between the driving component and the valve core to switch from a driving state to an active state includes: The control device controls the driving member to drive the first connecting member to move in a direction close to the exhaust branch, and when the position sensor detects that the valve core reaches the second position, the control device controls the driving member to drive the first connecting member to continue moving a second distance in the direction close to the exhaust branch, and the second distance is greater than the first distance.

14. The sample analyzer according to claim 13, characterized in that, The difference between the second distance and the first distance is less than or equal to half of the fitting clearance between the first connecting member and the second connecting member.

15. The sample analyzer according to claim 13, wherein: The control device is configured to control the driving component to close after controlling the connection state between the driving component and the valve core to switch from a driving state to an active state.

16. The sample analyzer according to claim 13, wherein The connection state between the control driving component and the valve core is switched from the active state to the driving state. Controlling the control driving component to drive the valve core away from the exhaust branch along the first direction includes: The control device controls the driving member to drive the first connecting member to move in a direction away from the exhaust branch. When the position sensor detects that the valve core reaches the second position, the control device controls the first connecting member to continue moving a third distance in the direction away from the exhaust branch, and the third distance is greater than the theoretical maximum detection deviation of the position sensor.

Images