Novel compact multi-channel fluid switching valve

Abstract

The application discloses a novel compact multi-channel fluid switching valve, which comprises a plunger assembly, a valve sleeve, a valve rod and a driving part. The outer wall of the valve sleeve is provided with a plurality of switching valve assemblies along the axial direction. Each switching valve assembly comprises at least two channel modules. Each channel module comprises three channel holes penetrating the wall surface of the valve sleeve, and one of the channel holes is communicated with the plunger assembly. The valve rod is arranged in the valve sleeve, and a circular arc groove is formed on the outer wall of the valve rod corresponding to each channel module. The length of the circular arc groove can cover any two adjacent channel holes. The driving part is connected to one end of the valve rod to drive the rotation of the valve rod, so that the circular arc groove guides any two adjacent channel holes. The technical scheme of the application aims to increase more switching channels and expand the station capacity without increasing the total length of the valve sleeve and the valve rod.

Description

Technical Field

[0001] This invention relates to the field of plunger pump technology, and in particular to a novel compact multi-channel fluid switching valve. Background Technology

[0002] A multi-channel switching valve is a device used to control the flow of liquids or gases. It has multiple channels or pipes, allowing the fluid flow path to be switched between different channels. A multi-channel switching valve typically consists of a valve sleeve, valve stem, actuator, and control system. The valve sleeve contains multiple inlets and outlets and channels, allowing connection to different piping systems. The valve stem is the moving or rotating component within the valve body; its position determines the fluid path. The actuator can control the position of the valve core electrically, pneumatically, or hydraulically. The control system monitors and controls the movement of the valve core to achieve channel switching and fluid control functions. Multi-channel switching valves are widely used in many industrial and laboratory applications. For example, in chemical processes, multi-channel switching valves can be used to introduce different reagents into the reactor, controlling different reaction paths. In liquid chromatography analysis, multi-channel switching valves can be used for operations such as sample injection, mobile phase switching, and column temperature control.

[0003] However, when a multi-channel switching valve has many channels, the following problems or defects are difficult to solve:

[0004] 1. To allow for more channels, the length of the valve sleeve and valve stem needs to be increased, which increases the difficulty of machining and limits the machining length due to limitations of the machining equipment;

[0005] 2. When the valve sleeve and valve stem are machined to a certain length, it is difficult to ensure the roundness of the valve sleeve and valve stem, which leads to a decrease in sealing performance, resulting in air leakage and liquid leakage, and failing to meet the functional requirements.

[0006] 3. In actual use, two or more multi-channel units are usually connected in series to assemble into a system, which increases the length and occupies more space.

[0007] 4. When multiple valve sleeves and valve stem assemblies are used in series, the structure of the driving components becomes complex, and the operational stability is reduced. Summary of the Invention

[0008] The main objective of this invention is to provide a novel compact multi-channel fluid switching valve, which aims to increase the number of switching channels and expand the station capacity without increasing the total length of the valve sleeve and valve stem.

[0009] To achieve the above objectives, the present invention proposes a novel compact multi-channel fluid switching valve, comprising:

[0010] plunger assembly;

[0011] A valve sleeve, wherein a plurality of switching valve assemblies are provided on the outer wall of the valve sleeve along its axial direction, each switching valve assembly includes at least two channel modules, each channel module includes a three-channel hole penetrating the wall of the valve sleeve, wherein one of the channel holes is connected to the plunger assembly;

[0012] A valve stem, which passes through the valve sleeve and has an arcuate groove along its outer wall corresponding to each of the channel modules, the length of which can cover any two adjacent channel holes; and

[0013] A driving component is provided, which drives one end of the valve stem to rotate so that the arc groove connects any two adjacent channel holes.

[0014] In one embodiment of this application, each of the switching valve assemblies includes two channel modules, and the channel holes of the two channel modules are located on the circumference of the same cross-section.

[0015] In one embodiment of this application, the two channel modules are symmetrically arranged.

[0016] In one embodiment of this application, the centers of the three-channel holes in each of the channel modules are located on the same virtual circumference.

[0017] In one embodiment of this application, each of the three channel holes of the channel module includes a plunger connection port communicating with the plunger assembly, an inlet port and an outlet port respectively disposed on both sides of the plunger connection port.

[0018] In one embodiment of this application, the centerline of the plunger connection port forms an angle of 45° with the centerlines of the inlet and outlet ports, respectively.

[0019] In one embodiment of this application, the liquid inlets of the two channel modules are arranged adjacent to each other, and the included angle between their centerlines is 90°;

[0020] The outlets of the two channel modules are arranged adjacent to each other, and the angle between their centerlines is 90°.

[0021] In one embodiment of this application, the valve stem has three spaced arc grooves on the circumference of the two channel modules, wherein two of the arc grooves can simultaneously cover two adjacent channel holes of the two channel modules.

[0022] In one embodiment of this application, each of the channel holes is provided with a connector.

[0023] In one embodiment of this application, the plunger assembly includes:

[0024] Measuring rod;

[0025] A plunger sleeve is provided, in which the measuring rod is inserted. The end of the inserted portion of the measuring rod forms a suction chamber with the inner wall of the plunger sleeve. One end of the suction chamber is provided with a connection port, which is connected to a channel hole.

[0026] The technical solution of this invention employs multiple switching valve assemblies arranged axially on the outer wall of the valve sleeve. Each switching valve assembly includes at least two channel modules distributed circumferentially along the outer wall of the valve sleeve. Each channel module includes three-channel holes penetrating the valve sleeve wall, one of which connects to a plunger assembly. More channels can be added to the same cross-section, and at least two independent switching valves can be arranged on the same cross-section, thereby expanding the capacity of the workstation, making the structure more compact, and occupying less space. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of the structure of a valve sleeve according to an embodiment of the present invention;

[0029] Figure 2 This is a schematic diagram of the structure of a valve stem according to an embodiment of the present invention;

[0030] Figure 3 This is a front view of an embodiment of the valve sleeve of the present invention;

[0031] Figure 4 for Figure 3 Sectional view at AA;

[0032] Figure 5 This is a front view of an embodiment of the valve stem of the present invention;

[0033] Figure 6 for Figure 5 Sectional view at BB;

[0034] Figure 7 This is a schematic diagram of the novel compact multi-channel fluid switching valve of the present invention in the liquid suction state;

[0035] Figure 8 This is a schematic diagram of the structure of the novel compact multi-channel fluid switching valve of the present invention in the liquid discharge state.

[0036] Explanation of icon numbers:

[0037] 10. Plunger assembly; 11. Metering rod; 12. Plunger sleeve; 20. Valve sleeve; 21. Switching valve assembly; 211. Channel module; 211a. Plunger connection port; 211b. Liquid inlet; 211c. Liquid outlet; 22. Connector; 30. Valve stem; 31. Circular groove.

[0038] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0039] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0040] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0041] In this invention, unless otherwise explicitly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0042] Furthermore, in this invention, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the word "and / or" throughout the text means including three parallel solutions; taking "A and / or B" as an example, it includes solution A, solution B, or a solution that simultaneously satisfies A and B. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0043] To address the problems in the background art, this invention proposes a novel compact multi-channel fluid switching valve.

[0044] Combined with reference Figure 1 and Figure 2 As shown, Figure 1 This is a schematic diagram of the valve sleeve 20 in one embodiment of this application. Figure 2 This is a schematic diagram of the valve stem 30 in one embodiment of this application. The valve sleeve 20 can generally be a columnar structure with an internal cylindrical cavity, and the inner wall of the cavity is precision machined to have a high degree of cylindricity and extremely high surface finish. The valve stem 30 can be cylindrical and can be made of wear-resistant materials that can withstand high-speed movement, such as ceramics, chrome-plated stainless steel, or titanium alloys. Multiple switching valve assemblies 21 are arranged at intervals along the axial direction on the outer wall of the valve sleeve 20 to handle the rotational switching of the liquid channel. By increasing the diameter of the inner cavity and setting at least two switching valve assemblies 21 on the same cross-section of the valve sleeve 20, more switching channels can be added, thereby increasing the capacity of the workstation without changing the length, making the structure more compact and occupying less space.

[0045] Each switching valve assembly 21 includes at least two channel modules 211. Each channel module 211 includes three channel holes penetrating the wall of the valve sleeve 20: a plunger connection port 211a, a liquid inlet 211b, and a liquid outlet 211c. The plunger connection port 211a is connected to the plunger assembly 10. The valve stem 30 passes through the valve sleeve 20. The outer wall of the valve stem 30 has an arc groove 31 corresponding to each channel module 211. The number of arc grooves 31 can correspond one-to-one with the number of channel modules 211, or different numbers can be set. For example, there are two channel modules 211, and the number of arc grooves 31 can be three, which can improve the efficiency of fluid channel switching. (Refer to reference) Figure 2 As shown, the length of the arc groove 31 can cover at least two adjacent channel holes, so that the two adjacent channel holes are connected for liquid suction or drainage.

[0046] The driving component (not shown) can be a motor or a driving cylinder, which drives the valve stem 30 to extend out of the valve sleeve 20. By rotating the valve stem 30, the arc groove 31 can be opened or blocked by any two adjacent channel holes, thereby performing liquid suction or discharge.

[0047] Combined with reference Figure 7 and Figure 8As shown, taking one of the channel modules 211 as an example, the working principle is explained as follows: When liquid is drawn in, the valve stem 30 rotates to open the plunger connection port 211a and the liquid inlet port 211b through the arc groove 31 (at this time, the liquid outlet port 211c on the valve sleeve 20 is in a closed state), the plunger is pulled down, the volume of the plunger cavity increases, and liquid is drawn in; when liquid is discharged, the valve stem 30 rotates at a certain angle to open the plunger connection port 211a and the liquid outlet port 211c through the arc groove 31 (at this time, the liquid inlet port 211b on the valve sleeve 20 is in a closed state), the plunger rises, the volume of the cavity decreases, and the liquid is discharged, realizing one filling action.

[0048] Combined with reference Figures 1 to 6 As shown in one embodiment of this application, due to limitations in processing equipment and technology, the valve stem 30 and valve sleeve 20 cannot be processed to be too long. After processing to a certain length, it is difficult to guarantee the roundness of the valve stem 30 and valve sleeve 20, resulting in decreased sealing performance, air leakage, and liquid leakage. This fails to meet functional requirements and significantly reduces bending strength, thus shortening the service life of the switching valve. To meet practical needs, two or more multi-channel units are usually connected in series to form a system, but this method occupies a large amount of space. Therefore, it is necessary to use only one valve sleeve 20 and valve stem 30 assembly, without increasing the total length of the valve sleeve 20 and valve stem 30, to maximize the number of switching channels, connect to more plunger pumps, and expand the station capacity. Under this premise, by increasing the diameter of the inner cavity of the valve sleeve 20, the number of channel modules 211 on the same cross-section of the valve sleeve 20 can be increased from one to two. Theoretically, more than two channel modules 211 can be used. However, due to limitations in processing equipment and machining difficulty, more than two channel modules 211 are not effective. In this embodiment, each switching valve assembly 21 includes two channel modules 211, and the channel holes of the two channel modules 211 are located on the circumference of the same cross-section. Through the above design, there are two independent switching valves on the same cross-section, and the structure is compact and occupies little space.

[0049] In one embodiment of this application, two channel modules 211 located on the same cross-section are symmetrical about one of the diameters of the cross-section. This not only allows the two channel modules 211 to be installed on opposite sides without affecting the layout of pipeline connections during use, but also avoids interference between the two channel modules 211.

[0050] Combined with reference Figure 3 and Figure 4As shown, further, in order to improve switching efficiency and accuracy, and to increase the number of channel modules 211 on the valve sleeve 20 of the same length, in this embodiment, the centers of the three channel holes of each channel module 211 are located on the same virtual circumference. This makes the structural layout more compact, occupies less space, and at the same time, improves switching accuracy and reduces filling errors.

[0051] Combined with reference Figure 4 As shown, in one embodiment of this application, each channel module 211's three-channel port includes a plunger connection port 211a communicating with the plunger assembly 10, an inlet port 211b, and an outlet port 211c respectively disposed on both sides of the plunger connection port 211a. Within the same channel module 211, the inlet port 211b and the outlet port 211c are respectively disposed on both sides of the plunger connection port 211a to facilitate the rotation of the valve stem 30 for switching between inlet and outlet. Between different channel modules 211, the inlets 211b of two different channel modules 211 are arranged adjacent to each other, and the outlet ports 211c of two different channel modules 211 are also arranged adjacent to each other. This facilitates the connection of different plunger assemblies 10, making the layout structure more compact and occupying less space.

[0052] Combined with reference Figure 4 As shown, in one embodiment of this application, the center line of the plunger connection port 211a forms an angle of 45° with the center lines of the liquid inlet port 211b and the liquid outlet port 211c.

[0053] Understandably, a 45° angle can reduce fluid resistance and pressure drop, helping to maintain more stable flow, reduce energy consumption, and improve the efficiency of the entire system. It also makes it easier to achieve a smooth transition between the plunger connection 211a and the inlet 211b or outlet 211c, reducing fluid resistance at the connection point and minimizing energy loss from fluctuations and turbulence. Furthermore, it helps improve structural strength; the 45° angle can disperse stress, reducing stress concentration in the piping system under pressure. Moreover, the 45° angle between the centerline of the plunger connection 211a and the centerlines of the inlet 211b and outlet 211c avoids dead zones or accumulation areas, helping to reduce the accumulation of contaminants and facilitating cleaning and maintenance. It also allows for a more compact layout of the channel module 211, helping to utilize available space more effectively. It can also reduce fluid vibration and noise within the channel module 211. Finally, it makes the installation and maintenance of the channel module 211 easier, helping to reduce engineering costs and the complexity of maintenance work. It should be noted that the angle between the center line of the plunger connection port 211a and the center lines of the liquid inlet port 211b and the liquid outlet port 211c can also be other values, such as 30°, 60°, etc. However, 45° is the optimal structural form.

[0054] Continue to refer to Figure 4 As shown, in one embodiment of this application, the liquid inlets 211b of the two channel modules 211 are arranged adjacent to each other, and the included angle between their center lines is 90°.

[0055] The outlets 211c of the two channel modules 211 are arranged adjacent to each other, and the angle between their center lines is 90°.

[0056] Understandably, setting the included angle between the liquid inlets 211b of the two channel modules 211 to 90° and the included angle between the liquid outlets 211c of the two channel modules 211 to 90° helps to make more efficient use of available space, making the structure between the two channel modules 211 more compact; it is also easier to maintain and clean, and can avoid dead corners, reduce the accumulation of dirt, help ensure that the system is kept clean, and reduce possible contamination.

[0057] Combined with reference Figure 5 and Figure 6 As shown, in one embodiment of this application, the valve stem 30 is provided with three spaced arc grooves 31 on the circumference of the two channel modules 211, wherein two of the arc grooves 31 can simultaneously cover two adjacent channel holes of the two channel modules 211.

[0058] Understandably, the two arc-shaped grooves 31 can simultaneously cover two adjacent channel holes of the two channel modules 211, meaning that the two channel modules 211 can simultaneously perform liquid inlet or outlet. When both channel modules 211 are in the liquid inlet state, one arc-shaped groove 31 is in a standby state. After rotating a certain angle, the positions of the three arc-shaped grooves 31 change. The arc-shaped groove 31 that was originally in the standby state covers the plunger connection port 211a and the outlet port 211c of one channel module 211, the arc-shaped groove 31 that originally covered the plunger connection port 211a and the inlet port 211b of the other channel module 211 is in a standby state, and the arc-shaped groove 31 that originally covered the plunger connection port 211a and the inlet port 211b of one channel module 211 covers the plunger connection port 211a and the outlet port 211c of the other channel module 211. This improves switching efficiency and filling accuracy.

[0059] Combined with reference Figure 7 and Figure 8 As shown, in one embodiment of this application, a connector 22 is provided on each of the channel holes to facilitate the connection of the pipe.

[0060] In one embodiment of this application, the plunger assembly 10 includes:

[0061] Measuring rod 11;

[0062] A plunger sleeve 12 is provided, in which a metering rod 11 is partially inserted. The end of the inserted portion of the metering rod 11 forms a liquid suction chamber with the inner wall of the plunger sleeve 12. One end of the liquid suction chamber is provided with a connection port, which is connected to a channel hole.

[0063] Understandably, part of the metering rod 11 is inserted into the plunger sleeve 12, and a sealing plug can be set at the end of its inserted part. The sealing plug and the inner wall of the plunger sleeve 12 form a liquid suction chamber. A connection port is provided in the liquid suction chamber. This connection port can be connected to the plunger connection port 211a through a pipe, and together with the valve rod 30, the filling and metering function can be realized.

[0064] When a batch of materials is filled, in order to avoid cross-contamination, mixing, and bacterial growth, the plunger assembly 10 and the rotary switching valve need to be cleaned and sterilized. Currently, the main method for cleaning and sterilizing the rotary switching valve is to disassemble the valve sleeve 20 and valve stem 30 separately for cleaning and sterilization. This operation is labor-intensive and time-consuming; repeated disassembly and reassembly can easily cause wear and tear on the components, and there is also a risk of damaging the switching valve and plunger assembly 10.

[0065] Therefore, the insertion end of the valve sleeve 20 is provided with a sealing area. Multiple working areas and cleaning areas are staggered inside the valve sleeve 20. The inner diameter of the working area is smaller than that of the cleaning area. At least three channel holes are provided through the wall of each working area, and one of the channel holes is connected to the liquid suction chamber. The valve stem 30 is inserted into the valve sleeve 20. The valve stem 30 is provided with a working section and a cleaning section corresponding to the working area and the cleaning area, respectively. The diameter of the working section is larger than that of the cleaning section, and the diameter of the working section is equal to the inner diameter of the working area. A liquid channel is provided on the working section corresponding to the channel hole. A sealing section is provided at one end of the valve stem 30. The sealing section abuts and is located within the sealing area. The valve stem 30 is driven and connected to a moving mechanism to drive the valve stem 30 to move within the valve sleeve 20 so that the working section and the working area are attached or offset.

[0066] The internal space of the valve sleeve 20 is roughly stepped, with the larger inner diameter being the cleaning zone and the smaller inner diameter being the working zone. In addition, there is a sealing zone at the insertion end of the valve sleeve 20, which cooperates with the valve stem 30 to seal its interior. At least three holes are drilled through the wall of each working zone, one of which connects to the suction chamber, through which liquid enters and exits. The valve stem 30 also has working sections and cleaning sections corresponding to the working and cleaning zones, respectively. The diameter of the working section is slightly larger than that of the cleaning section. The diameter of the working section is equal to the inner diameter of the working area. When the valve stem 30 is inserted into the valve sleeve 20, adjusting the length of the inserted portion allows the working section and the working area to fit tightly together. A liquid channel is provided on the working section corresponding to the channel hole. This liquid channel can be a hole extending through the inside of the valve stem 30, or a groove carved into the surface of the valve stem 30. When the valve stem 30 is rotated within the valve sleeve 20, this liquid channel connects to the channel hole communicating with the suction chamber and a channel hole located on one side of that channel hole, facilitating the suction chamber's absorption or discharge of liquid. A sealing section is provided at one end of the valve stem 30 corresponding to the sealing area. The diameter of the sealing section should be the same as the inner diameter of the sealing area. When the sealing section is inserted into the sealing area, it seals the valve stem 30 and the interior of the valve sleeve 20, creating a space with no communication with the outside except for the channel hole. The end of the valve stem 30 exposed outside the valve sleeve 20 is connected to a moving mechanism. This moving mechanism can drive the valve stem 30 to move a short distance within the valve sleeve 20, allowing the working section and the working area to fit together or be offset.

[0067] When the working section is in contact with the working area, the liquid channel on the working section can connect the channel hole on the working area that communicates with the suction chamber and the channel hole on one side of that channel hole. By changing the size of the suction chamber, liquid can be drawn in or discharged from the suction chamber, and the rotary switching valve enters the working state at this time. When the moving mechanism drives the sealing section of the valve stem 30 to insert into the sealing area of ​​the valve sleeve 20, the working section of the valve stem 30 is misaligned with the working area of ​​the valve sleeve 20, and the working section of the valve stem 30 enters the clean area. A gap is formed between the valve stem 30 and the valve sleeve 20. At this time, a chamber is formed inside the rotary switching valve that is not connected to the outside except for the channel hole on the valve sleeve 20. The rotary switching valve enters the CIP (Clean Injection Process). In the CIP / SIP state, cleaning water or disinfectant steam can enter the internal chamber from one of the channel holes on the valve sleeve 20 that are not connected to the suction chamber, and then exit from the other channel hole. Since the suction chamber of the plunger pump is connected to one channel hole, cleaning water or disinfectant steam can enter the plunger pump from that channel hole, so the plunger pump also enters the CIP / SIP state at this time. It should be noted that the length of the working section and the working area should be equal, the length of the cleaning section and the cleaning area should be equal, and the length of the cleaning section should be greater than that of the working section. This is so that when the moving valve stem 30 enters the CIP / SIP state, the cleaning area can completely accommodate the working section, forming a gap.

[0068] The above description is merely a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention's specification and drawings under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A compact multi-channel fluid switching valve, characterized in that, include: plunger assembly; A valve sleeve, wherein a plurality of switching valve assemblies are provided on the outer wall of the valve sleeve along its axial direction, each switching valve assembly includes at least two channel modules, each channel module includes a three-channel hole penetrating the wall of the valve sleeve, wherein one of the channel holes is connected to the plunger assembly; A valve stem, which passes through the valve sleeve and has an arc groove along its outer wall corresponding to each of the channel modules, the length of which can cover any two adjacent channel holes; as well as A driving component is provided, which drives one end of the valve stem to rotate so that the arc groove connects any two adjacent channel holes.

2. The compact multi-channel fluid switching valve as described in claim 1, characterized in that, Each of the switching valve assemblies includes two channel modules, and the channel holes of the two channel modules are located on the circumference of the same cross-section.

3. The compact multi-channel fluid switching valve as described in claim 2, characterized in that, The two channel modules are arranged symmetrically.

4. The compact multi-channel fluid switching valve as described in claim 3, characterized in that, The centers of the three-channel holes in each of the aforementioned channel modules are located on the same virtual circumference.

5. The compact multi-channel fluid switching valve as described in any one of claims 1 to 4, characterized in that, Each of the three channels in the channel module includes a plunger connection port that connects to the plunger assembly, an inlet port and an outlet port respectively disposed on both sides of the plunger connection port.

6. The compact multi-channel fluid switching valve as described in claim 5, characterized in that, The centerline of the plunger connection port forms an angle of 45° with the centerlines of the inlet and outlet.

7. The compact multi-channel fluid switching valve as described in claim 5, characterized in that, The liquid inlets of the two channel modules are arranged adjacent to each other, and the angle between their centerlines is 90°; The outlets of the two channel modules are arranged adjacent to each other, and the angle between their centerlines is 90°.

8. The compact multi-channel fluid switching valve as described in claim 1, characterized in that, The valve stem has three spaced arc grooves on the circumference of the two channel modules, wherein two of the arc grooves can simultaneously cover two adjacent channel holes of the two channel modules.

9. The compact multi-channel fluid switching valve as described in claim 1, characterized in that, Each of the aforementioned channel holes is provided with a connector.

10. The compact multi-channel fluid switching valve as described in claim 1, characterized in that, The plunger assembly includes: Measuring rod; A plunger sleeve is provided, in which the measuring rod is inserted. The end of the inserted portion of the measuring rod forms a suction chamber with the inner wall of the plunger sleeve. One end of the suction chamber is provided with a connection port, which is connected to a channel hole.

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