Flow path switching valve and flow path control system

Abstract

The present application relates to a flow path switching valve and a flow path control system, and relates to the field of flow path control technology, wherein the flow path switching valve includes a fixed unit and a rotating unit, the fixed unit includes at least 8 connection ports, wherein the 8 connection ports are port 1, port 2, port 3, port 4, port 5, port 6, port 7 and port 8, and the rotating unit has channel 1, channel 2, channel 3 and channel 4. The rotating unit has five different positions on the fixed unit, and each channel of the rotating unit at different positions can be connected to two connection ports. By switching the rotating unit at different positions, each channel is connected to a different connection port, thereby controlling multiple flow directions of the flow path through the flow path switching valve in the flow path control system, and the control is simple.

Description

Technical Field

[0001] The present invention relates to the technical field of flow path and flow direction control, and in particular to a flow path switching valve and a flow path control system. Background Art

[0002] Valves are commonly used in devices related to fluid transfer. A typical type of valve, for example used in medium-sized laboratory systems such as liquid chromatography systems (LCS), is a rotary switching valve.

[0003] Typically, a rotary switching valve generally includes a rotor and a stator, wherein the stator is referred to herein as a fixed unit and the rotor is referred to herein as a rotating unit, and the fixed unit and the rotating unit operate in coordination.

[0004] The fixed unit is provided with a plurality of inlet and outlet ports. These ports are fluidically connected to a corresponding set of holes on the inner surface of the fixed unit via holes. The inner surface of the fixed unit is in fluid-tight contact with the inner surface of the rotating unit. Typically, the rotating unit is formed as a disc, and the inner surface of the rotating unit presses against the inner surface of the fixed unit during rotational cooperation. The inner surface of the rotating unit is provided with one or more grooves, which interconnect with different holes depending on the rotational position of the rotating unit relative to the fixed unit.

[0005] The rotary switching valve may be designed to withstand high pressures (such as pressures above 30 MPa).The rotary switching valve may be made from a range of materials, such as stainless steel, high performance polymers and ceramics.

[0006] The number of inlets / outlets and the design of the slots in the rotating or fixed unit reflect the specific valve application.

[0007] A common type of multi-purpose valve has a single inlet port (typically located on the valve's axis of rotation) and multiple outlet ports spaced equidistantly around the inlet port. The rotating element has a single, radially extending slot with one end at the center of rotation, always connected to the inlet, and the other end connected to any outlet, depending on the rotating element's angular position relative to the fixed element. Such a valve can be used to direct flow from the inlet to any outlet—one at a time. Another type of valve is used to select from a set of components, each with an inlet and an outlet.

[0008] However, users sometimes wish to change the direction of the flow path through a component. For example, in the case of a chromatographic column, it may be desirable to load the column in one direction, then use a flow in the opposite direction to elute the retentate, or to reload the column with a different liquid. In prior art valves similar to those described above, additional components, such as flow diverter valves, are required to change the direction of the liquid flow path. When multiple valves are used to control the flow path direction, the process and control become complex and cumbersome. Summary of the Invention

[0009] In order to solve the problem that a flow path switching valve cannot satisfy the switching control of two flow paths and multiple flow directions in a flow path control system, the present application provides a flow path switching valve and a flow path control system.

[0010] The present application provides a flow path switching valve, comprising a fixed unit and a rotating unit, wherein the fixed unit comprises at least eight connection ports, wherein the eight connection ports are port 1, port 2, port 3, port 4, port 5, port 6, port 7, and port 8, respectively; the rotating unit has channel 1, channel 2, channel 3, and channel 4, and the rotating unit comprises a back surface and a front surface facing the fixed unit;

[0011] The rotating unit has at least a first position relative to the fixed unit. When the rotating unit is in the first position, the channel one connects port one and port eight, the channel three connects port two and port four, the channel two connects port three and port five, and the channel four connects port six and port seven.

[0012] By adopting the above technical solution, four channels are set on the rotating unit, each channel is connected to two ports in the fixed unit, the flow path enters the fixed unit from one port, and can flow out from the other port of the fixed unit after switching different channels of the rotating unit, thereby realizing flow direction switching through the flow path switching valve.

[0013] Furthermore, the rotating unit has a second position, a third position, a fourth position, and a fifth position relative to the fixed unit. When the rotating unit is in the second position, the channel 1 is connected to the port 8 and the port 7, the channel 3 is connected to the port 1 and the port 3, the channel 2 is connected to the port 2 and the port 4, and the channel 4 is connected to the port 5 and the port 6.

[0014] When the rotating unit is in the third position, the channel 1 is connected to the port 7 and the port 6, the channel 3 is connected to the port 8 and the port 2, the channel 2 is connected to the port 1 and the port 3, and the channel 4 is connected to the port 4 and the port 5;

[0015] When the rotating unit is in the fourth position, the channel 1 is connected to the port 5 and the port 4, the channel 3 is connected to the port 8 and the port 6, the channel 2 is connected to the port 1 and the port 7, and the channel 4 is connected to the port 2 and the port 3;

[0016] When the rotating unit is in the fifth position, the channel 1 is connected to port 3 and port 4, the channel 2 is connected to port 6 and port 8, the channel 3 is connected to port 5 and port 7, and the channel 4 is connected to port 1 and port 2.

[0017] By adopting the above technical solution, the rotating unit rotates relatively on the fixed unit, realizing the switching of the rotating unit to various positions on the fixed unit. The four channels on the rotating unit at different positions are also connected to different ports, realizing the flow of the flow path in various directions on the flow path switching valve.

[0018] Furthermore, the eight connection ports are evenly distributed along the circumferential direction on the fixed unit, the rotating unit has eight connection points, and the channel 1, channel 2, channel 3 and channel 4 each have two connection points;

[0019] When the rotating unit is in any one of the first position, the second position, the third position, the fourth position or the fifth position on the fixing unit, the eight connection points correspond to the eight connection ports one by one.

[0020] By adopting the above technical solution, when the rotating unit is in the first position, the second position, the third position, the fourth position or the fifth position relative to the fixed unit, it is ensured that the flow path always remains connected with the channel of the rotating unit during the process of flowing in or out through the port of the fixed unit, thereby realizing the flow of the flow path switching valve.

[0021] Furthermore, the second channel and the third channel are both located on the front side / back side of the rotating unit, and the second channel and the third channel are not connected to each other.

[0022] By adopting the above technical solution, it is ensured that channel two and channel three are on the same surface of the rotating unit, avoiding intersection and affecting the flow direction control of the flow path.

[0023] Furthermore, the plane where the channel 2 is located does not overlap with the plane where the channel 3 is located in space.

[0024] By adopting the above technical solution, it is ensured that channel two and channel three are set on different planes to avoid intersection and affect the flow direction control of the flow path.

[0025] Further, the channel 2 is located on the front side of the rotating unit, the channel 3 is located on the back side of the rotating unit, and the channel 3 is connected to two through holes that penetrate to the front side. When the rotating unit is in the first position, the two through holes are connected to the port 3 and the port 5 respectively; or,

[0026] The channel three is located on the front of the rotating unit, and the channel two is located on the back of the rotating unit. There are two through holes in the channel two that penetrate to the front. When the rotating unit is in the first position, the two through holes are connected to the port two and the port four respectively.

[0027] By adopting the above technical solution, one of channel two and channel three is set on the back of the rotating unit, and the other is located on the front of the rotating unit, so as to avoid the intersection of channel two and channel three in the same plane, and the channel located on the back of the rotating unit is connected to the port of the fixed unit through the through hole, so that the flow path can flow through the channel on the back of the rotating unit.

[0028] Further, the channel 2 is located on the front of the rotating unit, the channel 3 is located inside the rotating unit, and the channel 3 is connected to two blind holes extending to the front. When the rotating unit is in the first position, the two blind holes are connected to the port 3 and the port 5 respectively; or,

[0029] The channel three is located on the front of the rotating unit, and the channel two is located inside the rotating unit. There are two blind holes extending to the front in the channel two. When the rotating unit is in the first position, the two blind holes are connected to the port two and the port four respectively.

[0030] By adopting the above technical solution, one of channel two and channel three is set inside the rotating unit, and the other is located on the front of the rotating unit, so as to avoid the intersection of channel two and channel three in the same plane, and the channel located inside the rotating unit is connected to the port of the fixed unit through a blind hole, so that the flow path passes through the channel inside the rotating unit for circulation.

[0031] Furthermore, the channel 1 and / or the channel 4 are located on the front side of the rotating unit;

[0032] Alternatively, the channel one and / or the channel four is located on the back side of the rotating unit.

[0033] By adopting the above technical solution, channel one and channel four are both set on the front side of the rotating unit or the back side of the rotating unit, or one of channel one and channel four is set on the front side of the rotating unit and the other channel is set on the back side of the rotating unit. Combined with the above-mentioned settings of channel two and channel three, multiple flow modes of the flow path in the flow path switching valve can be realized, thereby realizing the switching and control of the flow direction of the flow path.

[0034] On the other hand, the present application also provides a flow control system, including a flow switching valve, a first flow channel, and a second flow channel, the flow switching valve including a fixed unit and a rotating unit, the fixed unit including at least 8 connection ports, wherein the 8 connection ports are port 1, port 2, port 3, port 4, port 5, port 6, port 7, and port 8; one end of the first flow channel is connected to port 1, and the other end is connected to port 4, and one end of the second flow channel is connected to port 3, and the other end is connected to port 6;

[0035] The rotating unit has channel one, channel two, channel three and channel four;

[0036] The flow control system includes at least a first state, a second state, a third state, a fourth state, and a fifth state. When the flow control system is in the first state, the channel 1 is connected to the port 1 and the port 8, the channel 3 is connected to the port 2 and the port 4, the channel 2 is connected to the port 3 and the port 5, and the channel 4 is connected to the port 6 and the port 7;

[0037] When the flow control system is in the second state, the channel 1 is connected to port 8 and port 7, the channel 3 is connected to port 1 and port 3, the channel 2 is connected to port 2 and port 4, and the channel 4 is connected to port 5 and port 6;

[0038] When the flow control system is in the third state, the channel 1 is connected to the port 7 and the port 6, the channel 3 is connected to the port 8 and the port 2, the channel 2 is connected to the port 1 and the port 3, and the channel 4 is connected to the port 4 and the port 5;

[0039] When the flow control system is in the fourth state, the channel 1 is connected to the port 5 and the port 4, the channel 3 is connected to the port 8 and the port 6, the channel 2 is connected to the port 1 and the port 7, and the channel 4 is connected to the port 2 and the port 3;

[0040] When the flow control system is in the fifth state, the channel 1 is connected to port 3 and port 4, the channel 2 is connected to port 5 and port 7, the channel 3 is connected to port 6 and port 8, and the channel 4 is connected to port 1 and port 2.

[0041] By adopting the above technical solution, the flow path switching valve is applied to the flow path control system. By adjusting the relative position of the rotating unit on the fixed unit, multiple states of operation can be achieved, so that the flows in the first flow path channel and the second flow path channel are in different flow directions.

[0042] Furthermore, the first flow channel includes a pH electrode circulation pool, and the second flow channel includes a back pressure valve.

[0043] By adopting the above technical solution, the pH electrode circulation pool and the back pressure valve are respectively arranged in the first flow channel and the second flow channel, so that the flow in the first flow channel enters the pH electrode circulation pool for pH value detection of the flow channel, and the flow in the second flow channel can open or close the back pressure valve.

[0044] In summary, this application includes at least one of the following beneficial technical effects:

[0045] In the flow path switching valve of the present invention, the fixed unit has 8 ports and the rotating unit has 4 channels. When the flow path is switched through the flow path switching valve, the rotating unit has multiple positions relative to the fixed unit. The liquid flows into one port of the fixed unit and enters the corresponding channel in the rotating unit, and then flows out from the other corresponding port connected to the channel. Since the rotating unit rotates, the ports of the fixed unit are connected to different channels, and the liquid flows out from different ports, thereby controlling the multiple flow direction states of the flow path in the flow path switching valve, and the control is simple.

[0046] In the flow control system, when the flow passes through the pH electrode circulation cell and the back pressure valve, the position of the rotating unit relative to the fixed unit in the flow switching valve is switched to realize four states: the pH electrode circulation cell and the back pressure valve both work simultaneously, one of them works alone, and both do not work at the same time (pipeline straight-through), as well as the adjustment of the waste liquid discharge state. Only one flow switching valve is required to achieve this, and there is no need to use multiple switching valves for control. The software program is simple and clear, not prone to errors, and easy to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 The present invention provides a structural schematic diagram of Example 1 of a mid-flow path switching valve;

[0048] Figure 2 A schematic structural diagram of another perspective of Example 1 of the mid-flow path switching valve provided by the present invention;

[0049] Figure 3 This is a front structural diagram of Example 1 of the rotating unit provided by the present invention;

[0050] Figure 4 The present invention provides a schematic diagram of the reverse structure of the rotating unit in Example 1;

[0051] Figure 5 This is a schematic diagram of the first position installation of the rotating unit in Example 1 of the present invention;

[0052] Figure 6 This is a schematic diagram of the second position installation of the rotating unit in embodiment 1 of the present invention;

[0053] Figure 7 This is a schematic diagram of the third position installation of the rotating unit in Example 1 of the present invention;

[0054] Figure 8 This is a schematic diagram of the fourth position installation of the rotating unit in Example 1 of the present invention;

[0055] Figure 9 This is a schematic diagram of the fifth position installation of the rotating unit in Example 1 of the present invention;

[0056] Figure 10This is a front structural diagram of Example 2 of the rotating unit provided by the present invention;

[0057] Figure 11 This is a schematic diagram of the reverse structure of Example 2 of the rotating unit provided by the present invention;

[0058] Figure 12 This is a front structural diagram of Example 3 of the rotating unit provided by the present invention;

[0059] Figure 13 The present invention provides a schematic diagram of the reverse structure of the rotating unit in Example 3;

[0060] Figure 14 This is a front structural diagram of Example 4 of the rotating unit provided by the present invention;

[0061] Figure 15 This is a schematic diagram of the reverse structure of the fourth embodiment of the rotating unit provided by the present invention;

[0062] Figure 16 A schematic structural diagram of the first state of Example 5 of the middle flow path control system of the present invention is provided;

[0063] Figure 17 A schematic diagram of the second state structure of Example 5 of the middle flow path control system of the present invention is provided;

[0064] Figure 18 A schematic diagram of the third state structure of Example 5 of the middle flow path control system of the present invention is provided;

[0065] Figure 19 A schematic structural diagram of a fourth state of Example 5 of a mid-flow path control system according to the present invention is provided;

[0066] Figure 20 The present invention provides a schematic structural diagram of the fifth state of Example 5 of the mid-flow path control system.

[0067] Numbers in the figure:

[0068] 1-Fixed unit; 101-Port 1; 102-Port 2; 103-Port 3; 104-Port 4; 105-Port 5; 106-Port 6; 107-Port 7; 108-Port 8;

[0069] 2A, 2B, 2C, 2D - rotation unit; 201 - channel one; 202 - channel two; 203 - channel three; 204 - channel four; 3 - first flow path channel; 31 - pH electrode circulation cell; 4 - second flow path channel; 41 - back pressure valve. DETAILED DESCRIPTION

[0070] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0071] Example 1

[0072] Please refer to Figure 1 、 Figure 2 、 Figure 3 and Figure 4 As shown, the flow path switching valve includes a fixed unit 1 and a rotating unit 2A, the fixed unit 1 is specifically the stator of the flow path switching valve, and the rotating unit 2A is specifically the rotor of the flow path switching valve. The fixed unit 1 includes at least 8 connection ports, wherein the 8 connection ports are port 1 101, port 2 102, port 3 103, port 4 104, port 5 105, port 6 106, port 7 107 and port 8 108, and the 8 connection ports are evenly spaced along the circumferential direction on the end face of the fixed unit 1. The rotating unit 2A has Channel 1 201, channel 2 202, channel 3 203 and channel 4 204 also have 8 connection points on the rotating unit 2A, and each channel has 2 connection points. There are connection points a and b at both ends of channel 1 201, connection points c and d at both ends of channel 2 202, connection points e and f at both ends of channel 3 203, and connection points g and h at both ends of channel 4 204. The 8 connection points are evenly spaced along the circumferential direction on the rotating unit 2A.

[0073] The rotating unit 2A includes a back surface and a front surface facing the fixed unit 1; wherein, channel 1 201, channel 2 202 and channel 4 204 are all arranged on the front surface of the rotating unit 2A, and channel 3 203 is located on the back surface of the rotating unit 2A, ensuring that the planes where channel 2 202 and channel 3 203 are located do not overlap in space.

[0074] The rotating unit 2A rotates relative to the fixed unit 1, and during the rotation of the rotating unit 2A, the rotating unit 2A has at least a first position relative to the fixed unit 1, such as Figure 5 As shown, when the rotating unit 2A is in the first position, channel one 201 connects port one 101 and port eight 108, channel three 203 connects port two 102 and port four 104, channel two 202 connects port three 103 and port five 105, and channel four 204 connects port six 106 and port seven 107.

[0075] In addition, the rotating unit 2A has a second position, a third position, a fourth position and a fifth position relative to the fixed unit 1, such as Figure 6 As shown, when the rotating unit 2A is in the second position, channel one 201 connects port eight 108 and port seven 107, channel two 202 connects port two 102 and port four 104, channel three 203 connects port one 101 and port three 103, and channel four 204 connects port five 105 and port six 106;

[0076] like Figure 7 As shown, when the rotating unit 2A is in the third position, channel one 201 connects port seven 107 and port six 106, channel two 202 connects port one 101 and port three 103, channel three 203 connects port eight 108 and port two 102, and channel four 204 connects port four 104 and port five 105;

[0077] like Figure 8 As shown, when the rotating unit 2A is in the fourth position, the channel 1 201 is connected to the port 4 104 and the port 5 105, the channel 2 202 is connected to the port 1 101 and the port 7 107, the channel 3 203 is connected to the port 8 108 and the port 6 106, and the channel 4 204 is connected to the port 2 102 and the port 3 103;

[0078] like Figure 9 As shown, when the rotating unit 2A is in the fifth position, channel one 201 connects port three 103 and port four 104, channel two 202 connects port six 106 and port eight 108, channel three 203 connects port five 105 and port seven 107, and channel four 204 connects port one 101 and port two 102.

[0079] On the fixed unit 1, the circle formed by the eight connection ports of rotating unit 2A is equal in size to the circle formed by the eight connection points, and their centers are co-linear. This ensures that when rotating unit 2A switches between different positions on the fixed unit 1, the eight connection points correspond one-to-one with the eight connection ports, allowing fluid flowing out of the connection ports to enter the various channels of rotating unit 2A. The various positions of rotating unit 2A on the fixed unit 1 are achieved by rotating rotating unit 2A at 45° intervals.

[0080] In this embodiment, since channel three 203 is located on the back of the rotating unit 2A, in order to ensure that the outflow through the connection port can enter channel three 203, channel three 203 is connected with two through holes that penetrate to the front, and the two through holes are respectively located at connection point e and connection point f.

[0081] The flow path switching valve corresponds to the eight connection ports on the fixed unit 1 through the four channels set on the rotating unit 2A, and switches multiple positions of the rotating unit 2A relative to the fixed unit 1, thereby realizing multiple switching modes of the flow path in the flow path control system. Compared with the 6-hole flow path switching valve and the 7-hole flow path switching valve in the prior art, the flow path switching valve has more flow path switching modes, and the flow path switching valve is simple to control and not prone to errors.

[0082] Example 2

[0083] The difference between this embodiment 2 and the above embodiment 1 lies in the difference of the rotating unit 2B in the flow path switching valve. Figure 10 and Figure 11 Shown is a schematic structural diagram of another rotating unit 2B.

[0084] In this embodiment, the rotating unit 2B is provided with four channels, namely channel 1 201, channel 2 202, channel 3 203, and channel 4 204. The rotating unit 2B also has eight connection points, with each channel having two connection points. Channel 1 201 has connection points a and b at both ends, channel 2 202 has connection points c and d at both ends, channel 3 203 has connection points e and f at both ends, and channel 4 204 has connection points g and h at both ends. Channel 1 201, channel 3 203, and channel 4 204 are all located on the front face of the rotating unit 2B, while channel 2 202 is located on the back face of the rotating unit 2B, ensuring that the planes of channel 2 202 and channel 3 203 do not overlap in space. Channel 2 202 has two through-holes extending to the front face, namely connection points c and d. Rotating unit 2B rotates relative to fixed unit 1. When rotating unit 2B is in the first position, the two through-holes (i.e., connection point c and connection point d) communicate with port 2 102 and port 4 104, respectively. When rotating unit 2B rotates to the second, third, fourth, or fifth position, the two through-holes communicate with the corresponding ports on fixed unit 1. This description is omitted here.

[0085] Example 3

[0086] The difference between this embodiment 3 and the above-mentioned embodiments 1 and 2 lies in the difference of the rotating unit 2C in the flow path switching valve. Figure 12 and Figure 13 Shown is a schematic structural diagram of another rotating unit 2C.

[0087] In this embodiment, the rotating unit 2C is provided with four channels, namely channel 1 201, channel 2 202, channel 3 203, and channel 4 204. The rotating unit 2C also has eight connection points, with each channel having two connection points. Channel 1 201 has connection points a and b at both ends, channel 2 202 has connection points c and d at both ends, channel 3 203 has connection points e and f at both ends, and channel 4 204 has connection points g and h at both ends. Channel 1 201, channel 2 202, channel 3 203, and channel 4 204 are all located on the front face of the rotating unit 2C. Channel 2 202 and channel 3 203 are staggered on the front face of the rotating unit 2C to ensure isolation between channel 2 202 and channel 3 203.

[0088] In another embodiment, channel one 201 and channel four 204 are both located on the front side of the rotating unit 2C, and channel two 202 and channel three 203 are both located on the back side of the rotating unit 2C. Channel two 202 and channel three 203 located on the back side of the rotating unit 2C are staggered and separated from each other, and connection points c and d at both ends of channel two 202, and connection points e and f at both ends of channel three 203 are all through holes that pass through the front and back sides of the rotating unit 2C.

[0089] Example 4

[0090] The difference between this embodiment 4 and the above embodiment 1 lies in the difference of the rotating unit 2D in the flow path switching valve. Figure 14 and Figure 15 Shown is a schematic structural diagram of another rotating unit 2D.

[0091] In this embodiment, the rotating unit 2D is provided with four channels, namely, channel 1 201, channel 2 202, channel 3 203, and channel 4 204. The rotating unit 2D also has eight connection points, with each channel having two connection points. Channel 1 201 has connection points a and b at its ends, channel 2 202 has connection points c and d at its ends, channel 3 203 has connection points e and f at its ends, and channel 4 204 has connection points g and h at its ends. Channel 1 201, channel 2 202, and channel 4 204 are all located on the front surface of the rotating unit 2D, while channel 3 203 is located within the rotating unit 2D. Furthermore, the planes of channel 2 202 and channel 3 203 do not overlap in space. Channel 3 203 is connected by two blind holes extending from the bottom of channel 3 203 to the front surface, namely connection points e and f. Rotating unit 2D rotates relative to fixed unit 1. When rotating unit 2D is in the first position, the two blind holes (i.e., connection points e and f) connect to port 3 103 and port 5 105, respectively. When rotating unit 2D rotates to the second, third, fourth, or fifth position, the two through holes connect to the corresponding ports on fixed unit 1. This description is omitted here.

[0092] In another embodiment, channel one 201, channel three 203 and channel four 204 are all located on the front of the rotating unit (not shown in the figure), channel two 202 is located inside the rotating unit, and the planes where channel two 202 and channel three 203 are located do not overlap in space.

[0093] Example 5

[0094] like Figure 16 、 Figure 17 、 Figure 18 、 Figure 19 and Figure 20 As shown, this embodiment provides a flow control system based on Example 1. In this embodiment, the flow control system is a liquid chromatography detection system. In liquid chromatography detection, in order to detect the pH value of the reagent in the flow path, a pH electrode flow cell 31 is provided in the reagent delivery pipeline. In addition, a back pressure valve 41 is also provided in the liquid delivery pipeline. The back pressure valve 4 is automatically opened and closed by compressing the internal spring due to the force generated by the flow in the pipeline itself. The main function of the back pressure valve is to set the positive flow path pressure required for opening and prevent the backflow of the medium.

[0095] In this embodiment, the system includes a flow path switching valve, a first flow path channel 3 and a second flow path channel 4 , wherein the first flow path channel 3 includes a pH electrode circulation pool 31 , and the second flow path channel 4 includes a back pressure valve 41 .

[0096] The flow path switching valve is the flow path switching valve in Example 1, one end of the first flow path channel 3 is connected to port one 101, and the other end is connected to port four 104, one end of the second flow path channel 4 is connected to port three 103, and the other end is connected to port six 106, so that both the first flow path channel 3 and the second flow path channel 4 can flow into and out of the flow path switching valve.

[0097] In this embodiment, the flow path control system includes at least a first state, a second state, a third state, a fourth state, and a fifth state.

[0098] like Figure 16 As shown, when the flow control system is in the first state, the rotating unit 2A of the flow switching valve is in the first position on the fixed unit 1. Channel 1 201 connects port 1 101 and port 8 108, channel 3 203 connects port 2 102 and port 4 104, channel 2 202 connects port 3 103 and port 5 105, and channel 4 204 connects port 6 106 and port 7 107. At this time, the pH electrode flow cell 31 in the first flow channel 3 is in operation, and the backpressure valve 41 in the second flow channel 4 is inoperative. The liquid reagent enters port 8 108 from channel 1 201 and then into the first flow channel 3. From the first flow channel 3, the liquid reagent enters the pH electrode flow cell 31, where its pH value is tested. It then enters port 4 104, passes through channel 3 203, and exits port 2 102, entering the chromatographic column. This prevents excessive pH from damaging the silica gel surface of the chromatographic column.

[0099] like Figure 17 As shown, when the flow control system is in the second state, the rotating unit 2A of the flow switching valve is in the second position on the fixed unit 1, channel one 201 connects port eight 108 and port seven 107, channel three 203 connects port one 101 and port three 103, channel two 202 connects port two 102 and port four 104, and channel four 204 connects port five 105 and port six 106; at this time, the flow control system is in the waste liquid discharge state, and the liquid reagent waste liquid that needs to be discharged enters from port eight 108 and is transported through channel one 201 to port seven 107 and enters the waste liquid collection pool.

[0100] like Figure 18As shown, when the flow control system is in the third state, the rotating unit 2A of the flow switching valve is in the third position on the fixed unit 1, channel one 201 connects port seven 107 and port six 106, channel three 203 connects port eight 108 and port two 102, channel two 202 connects port one 101 and port three 103, and channel four 204 connects port four 104 and port five 105; at this time, the pH electrode circulation pool 31 in the first flow channel 3 is turned on and does not work, and the back pressure valve 41 in the second flow channel 4 does not work either. The flow control system is in a bypass state, and the liquid reagent that does not need to be detected for pH value is directly transported into port eight 108, passes through channel three 203, and is discharged from port two 102 and enters the chromatographic column.

[0101] like Figure 19 As shown, when the flow control system is in the fourth state, the rotating unit 2A of the flow switching valve is in the fourth position on the fixed unit 1, channel one 201 connects port five 105 and port four 104, channel two 202 connects port one 101 and port seven 107, channel three 203 connects port eight 108 and port six 106, and channel four 204 connects port two 102 and port three 103; at this time, the pH electrode circulation pool 31 in the first flow channel 3 is turned on and does not work, and the back pressure valve 41 in the second flow channel 4 is working. The liquid entering the flow switching valve from port eight 108 passes through channel three 203 and enters the second flow channel 4 from port six 106, provides positive flow pressure through the back pressure valve 41, enters channel four 204 through port three 103, and then flows to the chromatographic column from port two 102. At the same time, the calibration solution or preservation solution can be transported to channel one 201 through port five 105, and then enter the pH electrode circulation pool 31 of the first flow channel 3 through port four 104, ensuring that the electrode bulb of the pH electrode is immersed in the preservation solution to calibrate and position the electrode. It does not need to be manually replaced and is immersed or calibrated externally. The common pH electrode calibration solution or preservation solution is 3 mol / L saturated KCl solution.

[0102] like Figure 20As shown, when the flow control system is in the fifth state, the rotating unit 2A of the flow path switching valve is in the fifth position on the fixed unit 1, channel 1 201 is connected to port 3 103 and port 4 104, channel 2 202 is connected to port 5 105 and port 7 107, channel 3 203 is connected to port 6 106 and port 8 108, and channel 4 204 is connected to port 1 101 and port 2 102. At this time, the pH electrode flow cell 31 in the first flow channel 3 is turned on and the back pressure valve 41 in the second flow channel 4 is also turned on, and the liquid reagent that needs to be tested for pH value is passed through the flow path 31. The liquid enters channel 2 202 from port 8 108, and then enters the second flow channel 4 from port 6 106. The positive flow pressure is provided by the back pressure valve 41, and then enters channel 1 201 through port 3 103. Then, it flows out from port 4 104 and enters the pH electrode circulation pool 31 of the first flow channel 3 for pH detection. Then, it enters channel 4 204 through port 1 101 and flows out from port 2 102 to the chromatographic column. The flow direction to the chromatographic column is ensured to remain consistent. The flow direction first passes through the back pressure valve 41 and then passes through the pH detection. If the flow is reversed, it will affect the pH detection performance and even damage the pH electrode.

[0103] By applying the flow path switching valve in the flow path control system, the pH electrode circulation pool 31 and the back pressure valve 41 in the flow path control system are controlled and switched to different working states, which facilitates the flow path control system to detect the pH value of the flow path. Moreover, when the pH electrode circulation pool 31 is not working, regardless of whether the back pressure valve 41 is in the working state, protective liquid or buffer solution can be injected into the pH electrode circulation pool 31 to correct the positioning electrode in the pH electrode circulation pool 31. Multiple state control of the chromatographic detection system is achieved through the control of a flow path switching valve. The software program is simple and clear, not prone to errors, and easy to operate.

[0104] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A flow path switching valve, comprising a fixed unit (1) and a rotating unit, characterized in that: The fixed unit (1) comprises at least eight connection ports, wherein the eight connection ports are port one (101), port two (102), port three (103), port four (104), port five (105), port six (106), port seven (107) and port eight (108); the rotating unit has channel one (201), channel two (202), channel three (203) and channel four (204); the rotating unit comprises a back surface and a front surface facing the fixed unit (1); The rotating unit has at least a first position relative to the fixed unit (1); when the rotating unit is in the first position, the channel one (201) is connected to the port one (101) and the port eight (108), the channel three (203) is connected to the port two (102) and the port four (104), the channel two (202) is connected to the port three (103) and the port five (105), and the channel four (204) is connected to the port six (106) and the port seven (107); The rotating unit also has a second position, a third position, a fourth position and a fifth position relative to the fixed unit (1). When the rotating unit is in the second position, the channel one (201) is connected to the port eight (108) and the port seven (107), the channel three (203) is connected to the port one (101) and the port three (103), the channel two (202) is connected to the port two (102) and the port four (104), and the channel four (204) is connected to the port five (105) and the port six (106); When the rotating unit is in the third position, the channel one (201) is connected to the port seven (107) and the port six (106), the channel three (203) is connected to the port eight (108) and the port two (102), the channel two (202) is connected to the port one (101) and the port three (103), and the channel four (204) is connected to the port four (104) and the port five (105); When the rotating unit is in the fourth position, the channel one (201) is connected to the port five (105) and the port four (104), the channel three (203) is connected to the port eight (108) and the port six (106), the channel two (202) is connected to the port one (101) and the port seven (107), and the channel four (204) is connected to the port two (102) and the port three (103); When the rotating unit is in the fifth position, the channel one (201) is connected to the port three (103) and the port four (104), the channel two (202) is connected to the port six (106) and the port eight (108), the channel three (203) is connected to the port five (105) and the port seven (107), and the channel four (204) is connected to the port one (101) and the port two (102).

2. The flow path switching valve according to claim 1, characterized in that: The eight connection ports are evenly distributed along the circumferential direction on the fixed unit (1); the rotating unit has eight connection points, and each of the channel one (201), channel two (202), channel three (203) and channel four (204) has two connection points; When the rotating unit is in any one of the first position, the second position, the third position, the fourth position or the fifth position on the fixed unit (1), the eight connection points correspond to the eight connection ports one by one.

3. The flow path switching valve according to claim 1, wherein: The second channel (202) and the third channel (203) are both located on the front side / back side of the rotating unit, and the second channel (202) and the third channel (203) are not connected to each other.

4. The flow path switching valve according to claim 1, wherein: The plane where the second channel (202) is located does not overlap with the plane where the third channel (203) is located in space.

5. The flow path switching valve according to claim 4, characterized in that: The second channel (202) is located on the front side of the rotating unit, and the third channel (203) is located on the back side of the rotating unit. The third channel (203) is connected to two through holes extending to the front side. When the rotating unit is in the first position, the two through holes are connected to the third port (103) and the fifth port (105) respectively; or, The channel three (203) is located on the front of the rotating unit, and the channel two (202) is located on the back of the rotating unit. There are two through holes in the channel two (202) that pass through the front. When the rotating unit is in the first position, the two through holes are connected to the port two (102) and the port four (104) respectively.

6. The flow path switching valve according to claim 4, characterized in that: The second channel (202) is located on the front of the rotating unit, the third channel (203) is located inside the rotating unit, and the third channel (203) is connected to two blind holes extending to the front. When the rotating unit is in the first position, the two blind holes are connected to the third port (103) and the fifth port (105) respectively; or, The channel three (203) is located on the front of the rotating unit, and the channel two (202) is located inside the rotating unit. The channel two (202) is connected to two blind holes extending to the front. When the rotating unit is in the first position, the two blind holes are respectively connected to the port two (102) and the port four (104).

7. The flow path switching valve according to claim 5 or 6, characterized in that: The channel 1 (201) and / or the channel 4 (204) are located on the front side of the rotating unit; Alternatively, the channel one (201) and / or the channel four (204) are located on the back side of the rotating unit.

8. A flow control system, characterized in that: The invention comprises a flow path switching valve, a first flow path channel (3) and a second flow path channel (4), wherein the flow path switching valve comprises a fixed unit (1) and a rotating unit, wherein the fixed unit (1) comprises at least 8 connection ports, wherein the 8 connection ports are respectively port 1 (101), port 2 (102), port 3 (103), port 4 (104), port 5 (105), port 6 (106), port 7 (107) and port 8 (108); one end of the first flow path channel (3) is connected to port 1 (101), and the other end is connected to port 4 (104); one end of the second flow path channel (4) is connected to port 3 (103), and the other end is connected to port 6 (106); The rotating unit has a channel 1 (201), a channel 2 (202), a channel 3 (203) and a channel 4 (204); The flow control system includes at least a first state, a second state, a third state, a fourth state and a fifth state. When the flow control system is in the first state, the channel one (201) is connected to the port one (101) and the port eight (108), the channel three (203) is connected to the port two (102) and the port four (104), the channel two (202) is connected to the port three (103) and the port five (105), and the channel four (204) is connected to the port six (106) and the port seven (107); When the flow control system is in the second state, the channel one (201) is connected to the port eight (108) and the port seven (107), the channel three (203) is connected to the port one (101) and the port three (103), the channel two (202) is connected to the port two (102) and the port four (104), and the channel four (204) is connected to the port five (105) and the port six (106); When the flow control system is in the third state, the channel one (201) is connected to the port seven (107) and the port six (106), the channel three (203) is connected to the port eight (108) and the port two (102), the channel two (202) is connected to the port one (101) and the port three (103), and the channel four (204) is connected to the port four (104) and the port five (105); When the flow control system is in the fourth state, the channel one (201) is connected to the port five (105) and the port four (104), the channel three (203) is connected to the port eight (108) and the port six (106), the channel two (202) is connected to the port one (101) and the port seven (107), and the channel four (204) is connected to the port two (102) and the port three (103); When the flow control system is in the fifth state, the channel one (201) is connected to the port three (103) and the port four (104), the channel two (202) is connected to the port five (105) and the port seven (107), the channel three (203) is connected to the port six (106) and the port eight (108), and the channel four (204) is connected to the port one (101) and the port two (102).

9. The flow path control system according to claim 8, characterized in that: The first flow channel (3) includes a pH electrode circulation pool (31), and the second flow channel (4) includes a back pressure valve (41).

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