Multi-flow-path switching valve and backpressure PH flow path switching module

Abstract

The utility model provides a multi-flow-path switching valve and a backpressure PH flow path switching module, and relates to the technical field of valve bodies. Comprising a stator and a rotor, the stator comprises a first port, a second port, a third port, a fourth port, a fifth port, a sixth port, a seventh port and an eighth port, and the first port, the second port, the third port, the fourth port, the fifth port and the sixth port are distributed on a first circumference. The seventh port and the eighth port are arranged in the first circumference, arc-shaped expansion grooves are formed in the seventh port and the eighth port in a communicating mode, the two arc-shaped expansion grooves, the seventh port and the eighth port are located on a second circumference concentric with the first circumference, and the seventh port and the eighth port are communicated with each other; the rotor can control communication between different ports through rotation. According to the scheme, multiple detection functions can be realized.

Description

Technical Field

[0001] The utility model relates to the technical field of valve bodies, in particular to a multi-flow path switching valve and a back pressure PH flow path switching module. Background Art

[0002] In existing chromatographic instruments, the use of pH electrodes faces the following problems: pH electrode flow cells are often used as a component of the main flow path of chromatographic separation. During the entire separation process, all reagents passing through the flow path will pass through the pH flow cell, and a considerable number of reagents do not need to be tested for their pH values ​​separately; in order to ensure the effectiveness of the electrode, it has to rely on manual replacement, external soaking or calibration;

[0003] The back pressure valve is mainly used in the pipeline system to prevent the medium from flowing back. However, in the existing chromatographic instruments, there are also situations where it is not necessary or cannot be used, such as when the forward flow pressure is insufficient, but the pipeline needs to be unobstructed. Therefore, in the combination of the pH electrode circulation pool and the back pressure valve system, there are four states: both working at the same time, the pH electrode working alone, the back pressure valve working alone, and both not working at the same time (pipeline straight-through). The above four states need to be realized through multiple switching valves, and the process and control are complicated and cumbersome. The utility model patent with publication number CN216692271U discloses a back pressure pH integrated valve module, but its flow channel design is concentrated on the same arc, and the rotation angle accuracy of the rotor is extremely high when switching, which is prone to misalignment. The utility model with publication number CN219975464U discloses a switching valve and a liquid chromatograph of a liquid chromatograph detection system, but it sets the interface in various directions of the stator, and the interface position is scattered, which greatly increases the difficulty of processing. Utility Model Content

[0004] The utility model discloses a multi-flow path switching valve, aiming to improve the problems of complex interface and high switching precision required for the existing PH valve.

[0005] The utility model adopts the following scheme:

[0006] The present application provides a multi-flow path switching valve, comprising a stator and a rotor, wherein the stator comprises a first port, a second port, a third port, a fourth port, a fifth port, a sixth port, a seventh port and an eighth port, wherein the first port, the second port, the third port, the fourth port, the fifth port and the sixth port are distributed on a first circumference, the seventh port and the eighth port are arranged inside the first circumference, and an arc-shaped expansion groove is arranged at the seventh port and the eighth port in communication, the two arc-shaped expansion grooves and the seventh port and the eighth port are located on a second circumference concentric with the first circumference, and the seventh port and the eighth port are communicated with each other;

[0007] The rotor comprises a first communicating groove, a second communicating groove, a third communicating groove and a fourth communicating groove, wherein projections of both ends of the first communicating groove and the second communicating groove on the stator are respectively located on a first circumference and a second circumference, and the rotor is adapted to switch between a first position, a second position, a third position, a fourth position and a fifth position relative to the stator; wherein when the rotor is in the first position, the first communicating groove communicates with the seventh port and the first port, and the second communicating groove connects the eighth port and the third port;

[0008] When the rotor is in the second position, the first communicating groove communicates with the seventh port and the sixth port, and the second communicating groove connects the eighth port and the fourth port;

[0009] When the rotor is in the third position, the first communicating groove communicates with the seventh port and the second port, the second communicating groove connects with the eighth port and the third port, and the third communicating groove communicates with the first port and the fifth port;

[0010] When the rotor is in the fourth position, the fourth communicating groove communicates with the first port and the fifth port, and the third communicating groove communicates with the second port and the third port;

[0011] When the rotor is in the fifth position, the fourth communicating groove communicates with the first port and the third port.

[0012] Furthermore, the top surface of the stator is provided with interfaces respectively connected with the first port, the second port, the third port, the fourth port, the fifth port and the sixth port.

[0013] Furthermore, a PH interface is provided on one side of the stator, and the PH interface connects the seventh port and the eighth port.

[0014] Furthermore, a groove is provided on the plane where the rotor is connected to the stator to reduce the contact area between the rotor and the stator, thereby reducing the friction between the two.

[0015] Furthermore, a convex surface is provided on a side of the rotor facing the stator, the convex surface is suitable for contacting and connecting with the rotor, and the first connecting groove, the second connecting groove, the third connecting groove and the fourth connecting groove are provided on the convex surface.

[0016] Furthermore, the third connecting groove and the fourth connecting groove are configured as arc-shaped grooves and are located on a third circumference, and the third circumference is the same size as the first circumference.

[0017] The utility model also provides a back-pressure PH flow path switching module, comprising a back-pressure valve, a PH electrode connecting pool and the multi-flow path switching valve described in any one of the above items, wherein the back-pressure valve is connected to the second port and the fifth port, the fourth port is connected to a calibration liquid source, the seventh port and the eighth port are connected to the PH electrode connecting pool, the first port is connected as an inlet, the third port is a sample outlet, and the sixth port is a waste liquid outlet.

[0018] Beneficial effects:

[0019] This solution sets the seventh interface and the eighth interface within the range of the second inner circumference, and connects the second circumference with the ports on the first circumference through the first connecting groove and the second connecting groove. The angle range of each rotation can be relatively large, so that the precision requirement for the rotation of the rotor is relatively low, which can reduce the production cost. By setting it in, it can switch between the first position and the fifth position at a time by rotating in the same direction. The switching is simple and convenient, and more functions can be realized to meet the diverse requirements of detection. Furthermore, grooves are set on the rotor to reduce the friction between the rotor and the stator, reduce the driving force requirements, and withstand greater pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the structure of a multi-flow path switching valve according to an embodiment of the utility model;

[0021] Figure 2 It is a structural schematic diagram of a stator of a multi-flow path switching valve having a port surface according to an embodiment of the utility model;

[0022] Figure 3 It is a front structural schematic diagram of a stator port surface of a multi-flow path switching valve according to an embodiment of the utility model;

[0023] Figure 4 It is a schematic cross-sectional structure diagram of a multi-flow path switching valve according to an embodiment of the utility model;

[0024] Figure 5 It is a schematic diagram of the axial side of a rotor of a multi-flow path switching valve according to an embodiment of the utility model;

[0025] Figure 6 It is a schematic plan view of a rotor of a multi-flow path switching valve according to an embodiment of the utility model;

[0026] Figure 7 This is a schematic diagram of port connection when the rotor of a multi-channel switching valve according to an embodiment of the utility model is in a first position;

[0027] Figure 8 It is a schematic diagram of port connection when the rotor of a multi-channel switching valve according to an embodiment of the utility model is in the second position;

[0028] Fig. 9 This is a schematic diagram of port connection when the rotor of a multi-flow path switching valve according to an embodiment of the utility model is in the third position;

[0029] Fig.10 It is a schematic diagram of port connection when the rotor of a multi-flow path switching valve according to an embodiment of the utility model is in the fourth position;

[0030] Fig.11 It is a schematic diagram of port connection when the rotor of a multi-flow path switching valve according to an embodiment of the utility model is in the fifth position;

[0031] Icons: switching valve 1, stator 11, first port 101, second port 102, third port 103, fourth port 104, fifth port 105, sixth port 106, seventh port 107, eighth port 108, arc expansion groove 109, PH interface 110, interface 111, first circumference 112, second circumference 113, rotor 12, first connecting groove 121, second connecting groove 122, third connecting groove 123, fourth connecting groove 124, groove 125, raised surface 126, third circumference 127, back pressure valve 2, PH electrode connecting pool 3, calibration liquid source 4. DETAILED DESCRIPTION

[0032] Combination Figures 1 to 11 As shown, this embodiment provides a back pressure PH flow path switching module, including a back pressure valve 2, a PH electrode connecting pool 3 and a multi-flow path switching valve, wherein the multi-flow path switching valve 1 includes a stator 11 and a rotor 12, and the stator 11 is provided with a first port 101, a second port 102, a third port 103, a fourth port 104, a fifth port 105, a sixth port 106, a seventh port 107 and an eighth port 108, and the first port 101, the second port 102, the third port 103, the fourth port 104, the fifth port 105, the sixth port 106, the seventh port 107 and the eighth port 108 are distributed on a first circumference 112, the seventh port 107 and the eighth port 108 are arranged in the first circumference 112, and in the seventh An arc-shaped expansion groove 109 is provided at the port 107 and the eighth port 108, and the two arc-shaped expansion grooves 109 and the seventh port 107 and the eighth port 108 are located on a second circumference 113 concentric with the first circumference 112, and the seventh port 107 and the eighth port 108 are connected to each other; the rotor 12 includes a first connecting groove 121, a second connecting groove 122, a third connecting groove 123 and a fourth connecting groove 124, wherein the projections of the two ends of the first connecting groove 121 and the second connecting groove 122 on the stator 11 are respectively located on the first circumference 112 and the second circumference 113, and the rotor 12 is suitable for switching between a first position, a second position, a third position, a fourth position and a fifth position relative to the stator 11;

[0033] The back pressure valve 2 connects the second port 102 and the fifth port 105, the fourth port 104 is connected to the calibration liquid source 4, the seventh port 107 and the eighth port 108 are connected to the pH electrode connection pool 3, the first port 101 is connected as an inlet, the third port 103 is an outlet, and the sixth port 106 is a waste liquid outlet.

[0034] Combination Figures 1 to 3 As shown, in this embodiment, the stator 11 is provided with a flow channel inside to communicate with the first port 101, the second port 102, the third port 103, the fourth port 104, the fifth port 105, and the sixth port 106 respectively, and the other end of each flow channel is provided with an interface 111, and the six interfaces 111 are all provided on the top surface of the stator 11 for convenient connection. Here, the interface 111 and the port are located on the opposite surface of the stator 11, so that the difficulty in processing the flow channel is lower, and the processing difficulty and processing cost of the stator 11 are reduced. A PH interface 110 is provided on one side of the stator 11, and the PH interface 110 communicates with the seventh port 107 and the eighth port 108. Here, a cavity is formed in the PH interface 110, and the seventh port 107 and the eighth port 108 are respectively connected to the cavity through a flow channel, so that the eighth port 108 and the seventh port 107 are kept in communication. The PH interface 110 here is used to connect the PH electrode connection pool 3. The arc expansion groove 109 is connected to the seventh port 107 and the eighth port 108, which facilitates the first connecting groove 121 and the second connecting groove 122 to communicate with the seventh port 107 and the eighth port 108, thereby reducing the required caliber of the seventh port 107 and the eighth port 108. Here, the two arc expansion grooves 109 are arranged on the second circumference 113. It should be noted that the first circumference 112 and the second circumference 113 described in this embodiment refer to the positions of the ports on the plane of the stator 11.

[0035] Combination Figures 5 and 6As shown, a driving device is provided on the rotor 12 to drive the rotor 12 to rotate. The driving device is an existing structure and is not described here. A convex surface 126 is provided on the side of the rotor 12 facing the stator 11, and the convex surface 126 is suitable for contacting and connecting with the rotor 12, and the first connecting groove 121, the second connecting groove 122, the third connecting groove 123, and the fourth connecting groove 124 are provided on the convex surface 126. Through the plane connection of the convex surface 126 with the stator 11, the contact area between the rotor 12 and the stator 11 can be reduced, thereby reducing the friction between the two to reduce the torsional force required for rotation. Further, a groove 125 is provided on the plane where the rotor 12 is connected to the stator 11 to reduce the contact area between the rotor 12 and the stator 11 and thus reduce the friction between the two. Here, the groove 125 is provided between each connecting groove and is located in the range between the first circumference 112 and the second circumference 113, so as not to be connected with each port. The third connecting groove 123 and the fourth connecting groove 124 are configured as arc-shaped grooves and are located on a third circumference 127 . The third circumference 127 is the same size as the first circumference 112 .

[0036] Combination Figures 7 to 11 As shown, the driving device is used to drive the rotor 12 to switch between the first position, the second position, the third position, the fourth position, and the fifth position. When switching in sequence:

[0037] When the rotor 12 is in the first position, the first communicating groove 121 communicates with the seventh port 107 and the first port 101, and the second communicating groove 122 connects the eighth port 108 and the third port 103, and the detection liquid flows in from the first port 101, is connected to the seventh port 107 through the first communicating groove 121, flows to the pH electrode circulation pool through the seventh port 107, and then flows from the eighth port 108 to the third port 103 and then flows out;

[0038] When the rotor 12 continues to rotate to the second position, the first connecting groove 121 connects the seventh port 107 and the sixth port 106, and the second connecting groove 122 connects the eighth port 108 and the fourth port 104. At this time, the calibration liquid in the fourth port 104 flows to the seventh port 107 through the first connecting groove 121, and then flows through the pH electrode circulation pool for calibration to detect the accuracy of the pH value, and then flows out through the sixth port 106 to discharge the detected waste liquid;

[0039] When the rotor 12 continues to rotate to the third position, the first connecting groove 121 connects the seventh port 107 and the second port 102, the second connecting groove 122 connects the eighth port 108 and the third port 103, and the third connecting groove 123 connects the first port 101 and the fifth port 105; at this time, the detection liquid flows in from the first port 101, flows to the fifth port 105 through the third connecting groove 123, then flows into the second port 102 through the back pressure valve 2, and then flows from the second port 102 through the first connecting groove 121 to the seventh port 107 to enter the pH electrode circulation pool, and then flows out from the third port 103 after passing through the eighth port 108 and the second connecting groove 122;

[0040] When the rotor 12 continues to rotate to the fourth position, the fourth communicating groove 124 communicates with the first port 101 and the fifth port 105, and the third communicating groove 123 communicates with the second port 102 and the third port 103; at this time, the detection liquid flows in from the first port 101, flows to the fifth port 105 through the third communicating groove 123, then flows into the second port 102 through the back pressure valve 2, and then flows from the second port 102 through the third communicating groove 123 to the third port 103 and flows out;

[0041] When the rotor 12 continues to rotate to the fifth position, the fourth connecting groove 124 connects the first port 101 and the third port 103 . At this time, the detection liquid directly flows out from the first port 101 through the fourth connecting groove 124 and the third port 103 without detection.

[0042] In the above process, the rotor 12 can be driven to switch between any positions by setting the angle of each position.

[0043] In this solution, the seventh interface 111 and the eighth interface 111 are arranged within the range of the second inner circumference 113, and the ports on the second circumference 113 and the first circumference 112 are connected through the first connecting groove 121 and the second connecting groove 122. The angle interval of each rotation can be relatively large, so that the precision requirement for the rotation of the rotor 12 is relatively low, which can reduce the production cost. By setting it in, it can switch between the first position to the fifth position at a time by rotating in the same direction. The switching is simple and convenient, and more functions can be realized to meet the diversified requirements of detection. Furthermore, a groove 125 is arranged on the rotor 12 to reduce the friction between the rotor 12 and the stator 11, reduce the driving force requirements, and can withstand greater pressure, with a pressure resistance of up to 10MPa.

[0044] It should be understood that the above are only preferred implementations of the present utility model, and the protection scope of the present utility model is not limited to the above embodiments. All technical solutions under the concept of the present utility model belong to the protection scope of the present utility model.

[0045] The above description of the drawings used in the implementation manner only shows certain embodiments of the utility model and should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

Claims

1. A multi-channel switching valve, comprising a stator and a rotor, wherein the stator comprises a first port, a second port, a third port, a fourth port, a fifth port, a sixth port, a seventh port and an eighth port, characterized in that: The first port, the second port, the third port, the fourth port, the fifth port, and the sixth port are distributed on a first circumference, the seventh port and the eighth port are arranged in the first circumference, and an arc expansion groove is arranged at the seventh port and the eighth port in communication, the two arc expansion grooves and the seventh port and the eighth port are located on a second circumference concentric with the first circumference, and the seventh port and the eighth port are in communication with each other; The rotor comprises a first connecting groove, a second connecting groove, a third connecting groove and a fourth connecting groove, wherein the projections of the two ends of the first connecting groove and the second connecting groove on the stator are respectively located on the first circumference and the second circumference, and the rotor is suitable for switching between a first position, a second position, a third position, a fourth position and a fifth position relative to the stator; wherein, When the rotor is in the first position, the first communicating groove communicates with the seventh port and the first port, and the second communicating groove connects the eighth port and the third port; When the rotor is in the second position, the first communicating groove communicates with the seventh port and the sixth port, and the second communicating groove connects the eighth port and the fourth port; When the rotor is in the third position, the first communicating groove communicates with the seventh port and the second port, the second communicating groove connects with the eighth port and the third port, and the third communicating groove communicates with the first port and the fifth port; When the rotor is in the fourth position, the fourth communicating groove communicates with the first port and the fifth port, and the third communicating groove communicates with the second port and the third port; When the rotor is in the fifth position, the fourth communicating groove communicates with the first port and the third port.

2. The multi-channel switching valve according to claim 1, characterized in that: The top surface of the stator is provided with interfaces which are respectively connected with the first port, the second port, the third port, the fourth port, the fifth port and the sixth port.

3. The multi-channel switching valve according to claim 1, characterized in that: A PH interface is provided on one side of the stator, and the PH interface is connected with the seventh port and the eighth port.

4. The multi-channel switching valve according to claim 1, characterized in that: A groove is arranged on the plane where the rotor is connected to the stator to reduce the contact area between the rotor and the stator, thereby reducing the friction between the two.

5. The multi-channel switching valve according to claim 1, characterized in that: A convex surface is provided on a side of the rotor facing the stator, the convex surface is suitable for contacting and connecting with the rotor, and the first connecting groove, the second connecting groove, the third connecting groove and the fourth connecting groove are provided on the convex surface.

6. The multi-channel switching valve according to claim 1, characterized in that: The third connecting groove and the fourth connecting groove are configured as arc-shaped grooves and are located on a third circumference, and the third circumference is the same in size as the first circumference.

7. A back pressure PH flow path switching module, characterized in that: It comprises a back pressure valve, a pH electrode connecting cell and the multi-channel switching valve according to any one of claims 1 to 6, wherein the back pressure valve connects the second port and the fifth port, the fourth port is connected to a calibration liquid source, the seventh port and the eighth port are connected to the pH electrode connecting cell, the first port is connected as an inlet, the third port is an outlet, and the sixth port is a waste liquid outlet.

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