Seven-way valve with pressure relief function
Patent Information
- Application Number
- CN202522487247.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-24
- Publication Date
- 2026-11-03
- Estimated Expiration
- 2035-11-24
AI Technical Summary
In chromatographic analysis systems, high-pressure fluids are difficult to dissipate naturally when switching between injection and loading states, leading to sample loss and measurement instability, which affects the accuracy and repeatability of experimental data.
A seven-way valve with pressure relief function was designed. By setting a pressure relief connection groove on the rotor and adding a pressure relief port on the stator, a pressure relief state is achieved between the sample injection state and the loading state, ensuring that the high-pressure fluid in the quantitative loop is safely released before switching.
This effectively prevents the backflow of high-pressure fluid within the quantitative loop, reduces sample loss, lowers system pressure fluctuations, and improves experimental repeatability and accuracy.
Smart Images
Figure CN224932219U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of valve body technology, and more specifically, to a seven-way valve with pressure relief function. Background Technology
[0002] In chromatographic analysis systems, the seven-way valve, as a core fluid control component, is responsible for switching between injection and loading states. During actual operation, after the injection phase, high-pressure fluid accumulates inside the quantitative loop, especially under high-pressure or ultra-high-pressure operating environments, where this high pressure is difficult to dissipate naturally. When the system switches from injection to loading, the high-pressure fluid in the quantitative loop can easily overflow back through the injection channel, reducing the actual sample injection volume. In scenarios involving small-volume samples, the proportion of sample loss is significantly amplified, and the resulting measurement deviation directly affects the accuracy and repeatability of experimental data. Simultaneously, direct switching under high pressure can cause pressure fluctuations, which may be transmitted to front-end components such as the injection needle, leading to abnormal fluctuations in the detection signal and ultimately resulting in unstable measurement results. These problems are particularly prominent in precision chromatographic analysis applications, severely restricting the reliability and operational efficiency of the system. Utility Model Content
[0003] This utility model discloses a seven-way valve with pressure relief function, which aims to solve the above-mentioned problems.
[0004] The present invention adopts the following solution: This application provides a seven-way valve with pressure relief function, comprising: a stator and a rotor. The stator includes a first port, a second port, a third port, a fourth port, a fifth port, and a sixth port. The rotor is provided with a first connecting groove, a second connecting groove, and a third connecting groove. The first port is adapted to connect to a high-pressure pump, and a metering loop is connected between the second port and the fifth port to maintain communication. The third port is adapted to connect to a waste liquid channel, the fourth port is adapted to connect to an injection channel, and the sixth port is adapted to connect to a chromatographic column. The rotor is adapted to rotate on the stator so that the seven-way valve can switch between an injection state and a loading state: when in the injection state, the first connecting groove connects the first port and the second port, and the third connecting groove connects the fifth port and the sixth port to connect the metering loop to the chromatographic column, and the second connecting groove connects the third port and the fourth port; when in the loading state, the first connecting groove connects the second port and the third port, the second connecting groove connects the fourth port and the fifth port, and the third connecting groove connects the first port and the sixth port. The stator is also provided with a pressure relief port, and the rotor is provided with a pressure relief connection groove suitable for connecting the pressure relief port and the fifth port; the seven-way valve also has a pressure relief state. When the rotor rotates to the pressure relief state, the pressure relief connection groove connects the pressure relief port and the fifth port to relieve pressure on the metering ring.
[0005] Furthermore, the pressure relief port is located at the center of the stator.
[0006] Furthermore, the pressure relief connection groove extends outward from the center of the rotor, and its length is shorter than that of the first connection groove, the second connection groove, and the third connection groove.
[0007] Furthermore, the fifth port is connected to an extension section extending toward the center of the stator for connection with the pressure relief connection groove.
[0008] Furthermore, the first connecting groove, the second connecting groove, and the third connecting groove are arranged at equal intervals around the circumference.
[0009] Furthermore, the rotational stroke is 30° between the sample injection state and the depressurization state, and the rotational stroke is 30° between the depressurization state and the loading state.
[0010] Beneficial effects: This scheme adds a pressure relief state between the loading and injection states. Specifically, a pressure relief connection groove is added to the rotor and a pressure relief port is added to the stator. By adding pressure relief positions, the residual pressure of the quantitative loop can be effectively discharged after injection and before loading, reducing the error caused by this pressure and effectively improving the repeatability and accuracy of the experiment. Attached Figure Description
[0011] Figure 1 This is a schematic diagram of the stator structure of a seven-way valve with pressure relief function according to an embodiment of this utility model; Figure 2 This is a schematic diagram of the rotor structure of a seven-way valve with pressure relief function according to an embodiment of this utility model; Figure 3 This is a schematic diagram of the connection relationship between the connecting groove and the port of a seven-way valve with pressure relief function in the loaded state according to an embodiment of this utility model; Figure 4 This is a schematic diagram of the connection relationship between the connecting groove and the port of a seven-way valve with pressure relief function in the sample injection state according to an embodiment of this utility model. Figure 5 This is a schematic diagram of the connection relationship between the connecting groove and the port of a seven-way valve with pressure relief function in the pressure relief state according to an embodiment of this utility model. Figure 6 This is a schematic diagram of the appearance of a seven-way valve with pressure relief function according to an embodiment of this utility model; Reference numerals: First port 1, Second port 2, Third port 3, Fourth port 4, Fifth port 5, Sixth port 6, Pressure relief port 7, Stator 8, Rotor 9, First connecting groove 91, Second connecting groove 92, Third connecting groove 93, Pressure relief connecting groove 94, High-pressure pump 10, Metering loop 11, Waste liquid channel 12, Sample injection channel 13, Chromatographic column 14. Detailed Implementation
[0012] Combination Figures 1 to 6 As shown, this embodiment provides a seven-way valve with pressure relief function, including: a stator 8 and a rotor 9. The stator 8 includes a first port 1, a second port 2, a third port 3, a fourth port 4, a fifth port 5, and a sixth port 6. The rotor 9 is provided with a first connecting groove 91, a second connecting groove 92, and a third connecting groove 93. The first port 1 is adapted to connect to a high-pressure pump 10, and a metering ring 11 is connected between the second port 2 and the fifth port 5 to maintain communication. The third port 3 is adapted to connect to a waste liquid channel 12, the fourth port 4 is adapted to connect to a sample injection channel 13, the sixth port 6 is adapted to connect to a chromatographic column 14, and the pressure relief port 7 is adapted to connect to a pressure relief channel. The rotor 9 is adapted to rotate on the stator 8 so that the seven-way valve can switch between a sample injection state and a loading state: when in the sample injection state, the first connecting groove 91 connects to the... The first port 1 and the second port 2 are connected, and the third connecting groove 93 connects the fifth port 5 and the sixth port 6 to connect the quantitative loop 11 to the chromatographic column 14. The second connecting groove 92 connects the third port 3 and the fourth port 4. When in the loading state, the first connecting groove 91 connects the second port 2 and the third port 3, the second connecting groove 92 connects the fourth port 4 and the fifth port 5, and the third connecting groove 93 connects the first port 1 and the sixth port 6. The stator 8 is also provided with a pressure relief port 7, and the rotor 9 is provided with a pressure relief connecting groove 94 suitable for connecting the pressure relief port 7 and the fifth port 5. The seven-way valve also has a pressure relief state. When the rotor 9 rotates to the pressure relief state, the pressure relief connecting groove 94 connects the pressure relief port 7 and the fifth port 5 to relieve pressure on the quantitative loop 11.
[0013] Continue to combine Figures 1 to 6As shown, in this embodiment, the ports on the stator 8 serve as functional interfaces for fluid path allocation, and the connecting grooves on the rotor 9 are groove structures with a certain depth and width to meet the requirements of fluid communication. Here, the first port 1 is used to connect to the high-pressure pump 10 to provide fluid power; the second port 2 and the fifth port 5 are connected through the quantitative ring 11 to achieve quantitative storage of the sample; the third port 3 is connected to the waste liquid channel 12 to discharge excess fluid; the fourth port 4 is connected to the injection channel 13 to introduce the sample; the sixth port 6 is connected to the chromatographic column 14 for analysis; and the pressure relief port 7 serves as the interface for the pressure relief channel. By adding a pressure relief state, a dedicated pressure relief step is inserted between the injection state and the loading state, thereby effectively avoiding sample overflow and measurement instability caused by high pressure in the quantitative ring 11 during state switching. The cooperative design of the pressure relief connecting groove 94 and the pressure relief port 7 allows the pressure in the quantitative ring 11 to be safely released before switching to the loading state. This design not only solves the problem of sample loss caused by high pressure mentioned in the background art, but also improves the reliability and accuracy of operation.
[0014] When the seven-way valve is in the injection state, the first connecting groove 91 connects the first port 1 and the second port 2, allowing the mobile phase provided by the high-pressure pump 10 to enter the quantitative loop 11. Simultaneously, the third connecting groove 93 connects the fifth port 5 and the sixth port 6, ensuring that the sample in the quantitative loop 11 can flow smoothly to the chromatographic column 14 to complete the injection operation. The second connecting groove 92 connects the third port 3 and the fourth port 4, used to handle waste liquid and fluid flow during the injection process. Therefore, the flow path arrangement in the injection state ensures the stability and reliability of sample injection.
[0015] When the seven-way valve is switched to the loading state, the first connecting groove 91 connects the second port 2 and the third port 3, connecting the metering loop 11 and the waste liquid channel 12 to discharge excess fluid; the second connecting groove 92 connects the fourth port 4 and the fifth port 5, allowing the injection channel 13 to load the sample into the metering loop 11; the third connecting groove 93 connects the first port 1 and the sixth port 6, maintaining the flow of the chromatographic column 14. This design supports sample loading operations and prepares the column for subsequent analysis.
[0016] To prevent sample overflow and measurement instability caused by high pressure in the quantitative loop 11 during the switch from the sample injection state to the loading state, this embodiment adds a pressure relief port 7 to the stator 8 and a pressure relief connection groove 94 to the rotor 9. When the rotor 9 rotates to the pressure relief state, the pressure relief connection groove 94 connects the pressure relief port 7 and the fifth port 5, allowing the high-pressure fluid in the quantitative loop 11 to flow to the pressure relief port 7 via the fifth port 5 and the pressure relief connection groove 94, thus safely releasing the pressure. As a preferred embodiment, the pressure relief state is independently set between the sample injection state and the loading state, ensuring that the pressure in the quantitative loop 11 is completely eliminated before switching to the loading state, preventing high-pressure fluid from being conducted to the injection needle, which could lead to sample loss and measurement fluctuations. Through the above technical solution, this seven-way valve not only realizes the basic function of flow path switching, but also effectively solves the impact of high pressure in the quantitative loop 11 on sample injection and measurement stability through a specially designed pressure relief mechanism, improving the overall reliability and accuracy of operation.
[0017] In this embodiment, the pressure relief port 7 is located at the center of the stator 8, and the fifth port 5 is connected to an extension section extending towards the center of the stator 8 for connection with the pressure relief connecting groove 94. The pressure relief connecting groove 94 extends outward from the center of the rotor 9, and its length is shorter than that of the first connecting groove 91, the second connecting groove 92, and the third connecting groove 93. The design of the pressure relief port 7 being located at the center ensures that the connection path between the pressure relief connecting groove 94 and the pressure relief port 7 is minimized when the rotor 9 rotates, thereby improving the pressure relief efficiency. In addition, the selection of the center position also takes into account the rotational symmetry of the rotor 9, making the pressure relief operation more stable and reliable. The design of placing the pressure relief port 7 at the center of the stator 8 optimizes the operation mechanism of the entire pressure relief process. When the rotor 9 rotates to the pressure relief state, the pressure relief connecting groove 94 can be directly aligned with the pressure relief port 7 located at the center. Since the center of the stator 8 is the reference position for rotational symmetry, the pressure relief connecting groove 94 can more smoothly connect the pressure relief port 7 and the fifth port 5 when extending from the center of the rotor 9, avoiding connection problems or dead volume problems caused by positional offset. This design ensures rapid release of high pressure, preventing pressure residue within the metering ring 11, thus completing the depressurization process completely before switching to the loading state. The length of the depressurization connection groove 94 is designed to ensure precise alignment with the depressurization port 7 during depressurization, while avoiding overlap or interference with other connection grooves. The shorter length accommodates the small-angle operation requirements during depressurization, preventing accidental connection to other ports during non-depressurization. The extension of the fifth port 5 shortens the physical distance between the fifth port 5 and the depressurization connection groove 94, ensuring a stable communication path. Since the depressurization connection groove 94 extends outward from the center of the rotor 9 and is relatively short, without the extension, it would be impossible to form an effective connection with the fifth port 5. The design of the extension extending towards the center of the stator 8 significantly reduces the distance between the fifth port 5 and the depressurization connection groove 94, allowing them to form a stable fluid channel during depressurization.
[0018] In this embodiment, the first connecting groove 91, the second connecting groove 92, and the third connecting groove 93 are arranged at equal intervals around the circumference. This allows for a 30° rotational travel between the sample injection state and the depressurization state, and a 30° rotational travel between the depressurization state and the loading state. Here, when switching from the sample injection state to the depressurization state, a 30° counterclockwise rotation can be performed, and when switching from the depressurization state to the loading state, a further 30° counterclockwise rotation can be performed.
[0019] In this embodiment, the port on stator 8 is suitable for connecting a 1 / 16'' connector. The 1 / 16'' connector is a standard interface specification widely used in high-pressure chromatography, and its unique conical sealing surface and locking structure provide excellent sealing performance under high pressure conditions. In this embodiment, rotor 9 can be a ceramic rotor 9, and stator 8 can be an N60 stator 8. Ceramic material has high hardness and wear resistance, significantly reducing the surface wear rate during frequent rotation switching and maintaining a precise fit between the sealing interface of rotor 9 and stator 8. N60 stator 8 refers to a stator 8 structure made of N60 material, which ensures the geometric stability of the port connection area under high-pressure impact. It should be noted that rotor 9 is connected to a drive motor for driving the rotor to rotate forward and backward, and for driving rotor 9 to rotate at a set angle with high precision. Other control structures within this seven-way valve can use existing structures, which will not be described in detail here.
[0020] This solution adds a pressure relief port 7 and a pressure relief connection groove 94 to form an independent pressure relief state. It can actively relieve the pressure of the quantitative loop 11 after the sample is injected, eliminate the high pressure, and then switch the state. It has the advantages of effectively avoiding the back overflow of high pressure fluid in the quantitative loop 11, reducing sample loss, reducing system pressure fluctuations, and improving the accuracy and stability of chromatographic analysis.
[0021] It should be understood that the above are only preferred embodiments of the present utility model, and the protection scope of the present utility model is not limited to the above embodiments. All technical solutions that fall within the scope of the present utility model are protected by the present utility model.
[0022] The accompanying drawings used in the above description of the embodiments only show some embodiments of the present invention and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.
Claims
1. A seven-way valve with pressure relief function, comprising: Stator and rotor, wherein the stator includes a first port, a second port, a third port, a fourth port, a fifth port, and a sixth port; The rotor is provided with a first connecting groove, a second connecting groove, and a third connecting groove; the first port is adapted to connect to a high-pressure pump, and a metering loop is connected between the second port and the fifth port to maintain communication; the third port is adapted to connect to a waste liquid channel, the fourth port is adapted to connect to an injection channel, and the sixth port is adapted to connect to a chromatographic column; the rotor is adapted to rotate on the stator so that the seven-way valve can switch between the injection state and the loading state. When in the injection state, the first connecting groove connects the first port and the second port, and the third connecting groove connects the fifth port and the sixth port to connect the quantitative loop with the chromatographic column, and the second connecting groove connects the third port and the fourth port; When in the loading state, the first connecting slot connects the second port and the third port, the second connecting slot connects the fourth port and the fifth port, and the third connecting slot connects the first port and the sixth port. Its features are, The stator is also provided with a pressure relief port, and the rotor is provided with a pressure relief connection groove suitable for connecting the pressure relief port and the fifth port; the seven-way valve also has a pressure relief state. When the rotor rotates to the pressure relief state, the pressure relief connection groove connects the pressure relief port and the fifth port to relieve pressure on the metering ring.
2. The seven-way valve with pressure relief function according to claim 1, characterized in that, The pressure relief port is located at the center of the stator.
3. The seven-way valve with pressure relief function according to claim 2, characterized in that, The pressure relief connection groove extends outward from the center of the rotor, and its length is shorter than the first connection groove, the second connection groove, and the third connection groove.
4. The seven-way valve with pressure relief function according to claim 3, characterized in that, The fifth port is connected to an extension section extending toward the center of the stator for connection with the pressure relief connection slot.
5. The seven-way valve with pressure relief function according to claim 3, characterized in that, The first connecting groove, the second connecting groove, and the third connecting groove are arranged at equal intervals around the circumference.
6. The seven-way valve with pressure relief function according to claim 3, characterized in that, The rotational stroke is 30° between the sample injection state and the depressurization state, and 30° between the depressurization state and the loading state.