A rotor valve head dedicated to gas chromatography

Abstract

The utility model discloses a rotor valve head special for gas chromatogram, including stator structure and rotor structure, the rotor structure movable installation is in the inside of stator structure, the stator structure top is connected with the compact structure of screw thread, and compact structure and rotor structure contact lock it.

Description

Technical Field

[0001] This utility model relates to the field of measurement technology, specifically to a rotor valve head for gas chromatography. Background Technology

[0002] A rotor valve head for gas chromatography is a specialized injection device component used in gas chromatographs. In gas chromatography analysis, samples need to be accurately and rapidly introduced into the chromatographic column for separation and analysis. The rotor valve head achieves effective control of the gas flow path through its precisely designed internal channels and rotation mechanism, thereby achieving accurate sample injection. A rotor valve typically consists of a rotatable rotor and a stationary stator. When the rotor rotates, it can selectively connect different gas channels or isolate certain channels, thereby controlling the injection of the sample and the direction of the carrier gas flow. Due to its high precision and excellent sealing performance, the rotor valve is particularly suitable for experimental environments requiring frequent sample or condition changes.

[0003] Existing rotor valves for gas chromatography have complex internal rotor structures that are difficult to install and disassemble, increasing the time required for debugging and calibration, and reducing the flexibility of the rotor valve during use. Utility Model Content

[0004] The purpose of this invention is to provide a rotor valve head specifically for gas chromatography, which is easy to use and solves the problem that existing rotor valves for gas chromatography have complex internal rotor structure installation and disassembly, which increases the debugging time and calibration difficulty for operators and reduces the flexibility of rotor valve use.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a rotor valve head for gas chromatography, comprising a stator structure and a rotor structure, wherein the rotor structure is movably installed inside the stator structure, and a clamping structure is threadedly connected to the top of the stator structure, the clamping structure contacting the rotor structure to lock it in place.

[0006] As a preferred embodiment of the rotor valve head for gas chromatography according to this utility model, the stator structure is a 4-way, 6-way, 8-way, 10-way, 12-way, 14-way or 16-way structure. The stator structure includes a stator body, a conical cavity is provided inside the stator body, a threaded seat is provided at the top of the stator body, and an operating cavity is provided at the bottom of the stator body.

[0007] As a preferred embodiment of the rotor valve head for gas chromatography according to this utility model, the stator body surface is provided with a circular surface, and ports are provided around the circular surface. The ports are connected to the conical cavity, and the number of ports is 4, 6, 8, 10, 12, 14 or 16.

[0008] As a preferred embodiment of the rotor valve head for gas chromatography according to this utility model, a ferrule is installed inside the port, and a hollow long bolt and a hollow short bolt are threadedly connected inside the port. The hollow long bolt and the hollow short bolt are spaced apart and communicate with the ferrule.

[0009] As a preferred embodiment of the rotor valve head for gas chromatography according to this utility model, the rotor structure is driven by pneumatic drive, manual structure and electric drive. The rotor structure includes a rotating cap, the bottom of which extends into the operating chamber. A valve core outer ring is sleeved on the surface of the rotating cap, and the surface of the valve core outer ring is rotatably connected to the inner wall of the conical cavity.

[0010] As a preferred embodiment of the rotor valve head for gas chromatography according to this utility model, the outer ring surface of the valve core is provided with flow channels, each flow channel has a predetermined path, adjacent flow channels are separated, and one flow channel is connected to two or more ports.

[0011] As a preferred embodiment of the rotor valve head for gas chromatography according to this utility model, the top of the rotating cap is provided with a polygonal head, and the outer ring of the valve core is provided with a polygonal hole for use with the polygonal head, and the polygonal head and the polygonal hole are movably connected.

[0012] As a preferred embodiment of the rotor valve head for gas chromatography of this utility model, the top of the rotating cap is threadedly connected to the valve core body, the top of the valve core body is fitted with a round cover, the bottom of the valve core body is provided with a threaded groove, the top of the polygonal head is provided with a screw threadedly connected to the threaded groove, and a gap is provided on the opposite side of the rotating cap and the valve core body.

[0013] As a preferred embodiment of the rotor valve head for gas chromatography according to this utility model, the clamping structure includes a locking head with anti-slip texture on its surface. The bottom of the locking head is provided with a threaded head that is threadedly connected to a threaded seat. A steel ball is movably connected to the bottom of the threaded head and is installed on the top of the round cover and movably connected thereto.

[0014] As a preferred embodiment of the rotor valve head for gas chromatography according to this utility model, the top of the locking head is threaded with a locking nut, the bottom of the locking nut is fitted with a spring, the bottom of the spring is fitted with a washer, and the washer is fitted on the top of the steel ball.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0016] 1. This utility model, through a precisely designed rotating cap and a multi-faceted hole mating structure, ensures that the flow channel can be accurately aligned with different ports during rotation, thereby achieving effective switching of the gas channel. In addition, the unique connection method between the screw and the threaded groove effectively prevents the rotating cap from loosening due to vibration or long-term use, ensuring that the flow channel position remains fixed. This design not only improves the accuracy of operation but also enhances the stability and reliability of equipment operation, which is especially important for gas chromatography analysis that requires high-precision control.

[0017] 2. This utility model further enhances the safety and durability of the entire system through the application of a clamping structure. The locking mechanism composed of the locking head, spring, and steel ball can effectively and securely lock the rotor structure in the required position after adjustment, avoiding the risk of accidental displacement. At the same time, the presence of the shim not only helps to evenly distribute pressure and reduce wear, but also extends the service life of the components. Overall, this design reduces the frequency of maintenance, lowers operating costs, and provides users with a safer and more reliable experimental environment, making it very suitable for applications under demanding laboratory conditions. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of this utility model;

[0019] Figure 2 This is an exploded view of the present invention;

[0020] Figure 3 This is a schematic diagram of the stator structure of this utility model;

[0021] Figure 4 This is an exploded view of the stator structure of this utility model;

[0022] Figure 5 This is a schematic diagram of the clamping structure of this utility model;

[0023] Figure 6 This is an exploded view of the clamping structure of this utility model;

[0024] Figure 7 This is a schematic diagram of the rotor structure of this utility model;

[0025] Figure 8 This is an exploded view of the rotor structure of this utility model;

[0026] Figure 9 This is a cross-sectional view of the present invention.

[0027] In the diagram: 1. Stator structure; 2. Clamping structure; 3. Rotor structure; 101. Stator body; 102. Threaded seat; 103. Circular surface; 104. Operating cavity; 105. Hollow long bolt; 106. Hollow short bolt; 107. Port; 108. Compression sleeve; 109. Conical cavity; 201. Locking head; 202. Anti-slip texture; 203. Threaded head; 204. Locking nut; 205. Spring; 206. Washer; 207. Steel ball; 301. Rotating cap; 302. Flow channel; 303. Valve core body; 304. Round cover; 305. Valve core outer ring; 306. Polygonal hole; 307. Threaded groove; 308. Screw; 309. Polygonal head; 310. Clearance. Detailed Implementation

[0028] Please see Figures 1-9 A rotor valve head for gas chromatography includes a stator structure 1 and a rotor structure 3. The rotor structure 3 is movably installed inside the stator structure 1. A clamping structure 2 is threadedly connected to the top of the stator structure 1. The clamping structure 2 contacts the rotor structure 3 and locks it in place.

[0029] Furthermore, the stator structure 1 is a 4-way, 6-way, 8-way, 10-way, 12-way, 14-way or 16-way structure. The stator structure 1 includes a stator body 101, a tapered cavity 109 is provided inside the stator body 101, a threaded seat 102 is provided at the top of the stator body 101, and an operating cavity 104 is provided at the bottom of the stator body 101.

[0030] Furthermore, the surface of the stator body 101 is provided with a circular surface 103, and ports 107 are provided around the circular surface 103. The ports 107 are connected to the conical cavity 109, and the number of ports 107 is 4, 6, 8, 10, 12, 14 or 16.

[0031] Furthermore, a ferrule 108 is installed inside port 107, and hollow long bolts 105 and hollow short bolts 106 are threadedly connected inside port 107. The hollow long bolts 105 and hollow short bolts 106 are spaced apart and are connected to the ferrule 108.

[0032] Furthermore, the rotor structure 3 is driven by pneumatic drive, manual structure and electric drive. The rotor structure 3 includes a rotating cap 301. The bottom of the rotating cap 301 extends into the operating cavity 104. A valve core outer ring 305 is sleeved on the surface of the rotating cap 301. The surface of the valve core outer ring 305 is rotatably connected to the inner wall of the conical cavity 109.

[0033] Furthermore, the outer ring 305 of the valve core is surrounded by flow channels 302, each flow channel 302 has a predetermined path, adjacent flow channels 302 are separated, and one flow channel 302 is connected to two or more ports 107.

[0034] Furthermore, the top of the rotating cap 301 is provided with a polygonal head 309, and the inner part of the outer ring 305 of the valve core is provided with a polygonal hole 306 that is used in conjunction with the polygonal head 309. The polygonal head 309 and the polygonal hole 306 are movably connected.

[0035] Furthermore, the top of the rotating cap 301 is threadedly connected to the valve core 303, the top of the valve core 303 is fitted with a round cover 304, the bottom of the valve core 303 is provided with a threaded groove 307, the top of the polygonal head 309 is provided with a screw 308 threadedly connected to the threaded groove 307, and a gap 310 is provided on the opposite side of the rotating cap 301 and the valve core 303.

[0036] Furthermore, the clamping structure 2 includes a locking head 201, the surface of which is provided with anti-slip texture 202, and the bottom of the locking head 201 is provided with a threaded head 203 that is threadedly connected to the threaded seat 102. A steel ball 207 is movably connected to the bottom of the threaded head 203, and the steel ball 207 is installed on the top of the round cover 304 and movably connected to it.

[0037] Furthermore, the top of the locking head 201 is threaded with a locking nut 204, the bottom of the locking nut 204 is fitted with a spring 205, the bottom of the spring 205 is fitted with a washer 206, and the washer 206 is fitted on the top of the steel ball 207.

[0038] When switching the air path, the rotating cap 301 is driven to rotate. The rotating cap 301 drives the polygonal hole 306 and the outer ring 305 of the valve core to rotate through the polygonal head 309, thereby changing the direction of the flow channel 302. This allows the flow channel 302 to connect to different ports 107. By connecting different ports 107, different ferrules 108 can be connected to change the air path. When the rotating cap 301 rotates, it drives the screw 308 to rotate inside the threaded groove 307 to prevent the rotating cap 301 from loosening after rotation. By setting the gap 310, the rotating cap 301 is given room to rotate.

[0039] After adjustment, the rotor structure 3 is locked by the clamping structure 2. The locking nut 204 is rotated downwards, which causes the spring 205 to compress. The spring 205 applies pressure to the steel ball 207 through the washer 206. The steel ball 207 presses against the valve core 303 of the round cover 304. The valve core 303 applies pressure downwards to the outer ring 305 of the valve core and the rotating cap 301, so that the outer ring 305 of the valve core is stuck in the inner wall of the conical cavity 109, preventing the rotor structure 3 from loosening.

[0040] Furthermore, the rotor valve head employs a collaborative design using three or more materials. The metal components of stator structure 1 are made of one or more of stainless steel, Hastelloy, and Monel alloy, while rotor structure 3 is made of one or more of PEEK and polyimide. This combination of multiple materials not only enhances overall wear resistance but also better meets the stability requirements under complex operating conditions.

[0041] The core principle of the rotor valve is that the rotation of the rotor structure 3 changes the connection between the flow channel 302 and the port 107, thereby realizing the preset gas path function. Its working process is divided into two states: loading and injection. In the loading state, the rotor structure 3 is in the initial position. At this time, the carrier gas enters the port 107 through the hollow short bolt 106, the hollow long bolt 105 and the ferrule 108. The carrier gas inside one port 107 is guided by the flow channel 302 into the other port 107, and then directly enters the chromatographic column through the other port 107. At the same time, the sample is injected through a syringe or autosampler, flows through the sample ring and is discharged from the vent port until the sample ring is filled with sample, thus completing the sample loading.

[0042] During sample injection, the rotating cap 301 drives the outer ring 305 of the valve core and the flow channel 302 to rotate. The flow channel 302 changes the connection relationship of several ports 107. The carrier gas no longer enters the chromatographic column directly, but first flows through the sample ring, pushing all the samples in the sample ring to the chromatographic column. Then the carrier gas continues to flush the chromatographic column to complete the separation. The tight fit between the outer ring 305 of the valve core and the conical cavity 109 inside the stator body 101 avoids air leakage and ensures analytical accuracy. There are several ports 107, and by designing different numbers of ports 107 and the shape of the flow channel 302, complex functions can be realized, such as multi-dimensional column switching and target component backflushing to remove matrix interference. The bottom of the rotating cap 301 can be connected to a motor, which drives its rotation and the switching time can be precisely controlled by the instrument program to adapt to automated analysis processes. The gas chromatography rotor valve changes the gas path connection through mechanical rotation. It is the "gas path switch" that realizes core operations such as sample injection and flow path switching. Its performance directly affects the accuracy and efficiency of chromatographic analysis.

[0043] The installation method of rotor structure 3 abandons the cumbersome process of traditional threaded connections involving "multiple rotations, disassembling the lock core, and reinstalling the valve core." It adopts a quick-insertion locking structure, which can complete the installation without complicated operations, significantly shortening the debugging time. Rotor structure 3 supports direct rotation and adjustment with tools, and operators can observe the valve core matching degree in real time. Precise alignment can be ensured without professional skills, solving the pain point of "complex debugging and reliance on experience" in traditional valve heads. Unlike the design limitation of fixed valve heads on the market that are "discarded when worn," rotor structure 3 can be calibrated by turning it according to the degree of wear. Rotor structure 3 is also easy to replace individually, which delays the overall aging by adjustment and avoids the waste of resources by "discarding the whole body," significantly reducing the replacement frequency and long-term costs.

[0044] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A rotor valve head for gas chromatography, comprising a stator structure (1) and a rotor structure (3), characterized in that: The rotor structure (3) is movably installed inside the stator structure (1). The top of the stator structure (1) is threadedly connected to a clamping structure (2), which contacts the rotor structure (3) to lock it in place.

2. The rotor valve head for gas chromatography according to claim 1, characterized in that: The stator structure (1) is a 4-way, 6-way, 8-way, 10-way, 12-way, 14-way or 16-way structure. The stator structure (1) includes a stator body (101), a conical cavity (109) is provided inside the stator body (101), a threaded seat (102) is provided at the top of the stator body (101), and an operating cavity (104) is provided at the bottom of the stator body (101).

3. The rotor valve head for gas chromatography according to claim 2, characterized in that: The stator body (101) has a circular surface (103) on its surface, and ports (107) are arranged around the circular surface (103). The ports (107) are connected to the conical cavity (109). The number of ports (107) is 4, 6, 8, 10, 12, 14 or 16.

4. The rotor valve head for gas chromatography according to claim 3, characterized in that: The port (107) is equipped with a ferrule (108), and the port (107) is threaded with a hollow long bolt (105) and a hollow short bolt (106). The hollow long bolt (105) and the hollow short bolt (106) are spaced apart and are connected to the ferrule (108).

5. The rotor valve head for gas chromatography according to claim 4, characterized in that: The rotor structure (3) can be driven by pneumatic, manual or electric means. The rotor structure (3) includes a rotating cap (301), the bottom of which extends into the operating chamber (104). A valve core outer ring (305) is fitted on the surface of the rotating cap (301), and the surface of the valve core outer ring (305) is rotatably connected to the inner wall of the conical cavity (109).

6. The rotor valve head for gas chromatography according to claim 5, characterized in that: The outer ring (305) of the valve core is surrounded by flow channels (302), each flow channel (302) has a predetermined path, adjacent flow channels (302) are separated, and one flow channel (302) is connected to two or more ports (107).

7. A rotor valve head for gas chromatography according to claim 6, characterized in that: The rotating cap (301) has a polygonal head (309) on top, and a polygonal hole (306) is opened inside the outer ring (305) of the valve core to cooperate with the polygonal head (309). The polygonal head (309) and the polygonal hole (306) are movably connected.

8. The rotor valve head for gas chromatography according to claim 7, characterized in that: The top of the rotating cap (301) is threadedly connected to the valve core body (303), the top of the valve core body (303) is equipped with a round cover (304), the bottom of the valve core body (303) is provided with a threaded groove (307), the top of the polygonal head (309) is provided with a screw (308) that is threadedly connected to the threaded groove (307), and there is a gap (310) on the opposite side of the rotating cap (301) and the valve core body (303).

9. A rotor valve head for gas chromatography according to claim 8, characterized in that: The clamping structure (2) includes a locking head (201), the surface of which is provided with anti-slip texture (202), and the bottom of the locking head (201) is provided with a threaded head (203) that is threadedly connected to the threaded seat (102). A steel ball (207) is movably connected to the bottom of the threaded head (203), and the steel ball (207) is installed on the top of the round cover (304) and movably connected to it.

10. A rotor valve head for gas chromatography according to claim 9, characterized in that: The locking head (201) is threaded with a locking nut (204) at the top, and a spring (205) is installed at the bottom of the locking nut (204). A washer (206) is installed at the bottom of the spring (205), and the washer (206) is installed on the top of the steel ball (207).

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