Multi-runner switching valve and injection pump

Abstract

The utility model discloses a multi-runner switching valve and an injection pump, the switching valve comprises a stator shell part, a first gasket, a second gasket and a rotor part, the stator shell part is provided with a first concave part and a second concave part located in the first concave part; at least one first gasket is mounted in the second concave part, and at least one second gasket is mounted on the first gasket; the stator shell part is provided with a plurality of branch ports, and the branch ports are communicated to the respective second flow channels through the respective first flow channels; and each second flow channel is provided with an opening in the second concave part. According to the utility model, through the design of the special-shaped first gasket and the special-shaped second gasket, the stator and the rotor are combined more tightly, and the sandwich structure enables the sealing performance and the wear resistance of the whole stator to be improved; at least one through hole is formed in the first concave part, and injection warm water can be introduced to wash crystals, so that the risk of abrasion or adhesion is reduced, and the service life is prevented from being shortened.

Description

Technical Field

[0001] This utility model relates to a switching valve for fluid distribution, and more particularly to a multi-channel switching switching valve and an injection pump. Background Technology

[0002] When using syringe pumps for delicate operations such as pipetting, if multiple fluids need to be dispensed, a switching valve is generally considered. Existing switching valves include ceramic valves, which typically refer to a stator made from a single piece of sintered ceramic material and then machined, or a stator made from engineering plastics, PTFE, PEEK, stainless steel, etc., machined as a single piece, paired with a rotor made from the same material. The stator and rotor are sealed by their mating surfaces. The rotor is connected to the motor shaft, and the motor drives the rotor to rotate, connecting the holes on the stator with the grooves on the rotor, thereby allowing the fluid (such as liquid) to flow in and out, thus achieving fluid dispensing.

[0003] Under normal operating conditions, the stator and rotor are fitted together, with their surfaces sealed by precision machining. Grooves on the rotor connect the holes on the stator to complete the distribution of fluids (such as liquids) by the rotary valve. After a period of use or operation, crystallization, blockage, or wear may occur at the mating surfaces. This is not visible from the outside. If crystallization or particles are not addressed promptly, they will wear down the sealing surfaces, leading to leakage and affecting normal fluid distribution and the lifespan of the equipment. Furthermore, the stator and rotor are typically made of materials that are hard on one side and soft on the other. Due to the difference in hardness, the softer side may wear down over time, causing leakage. Moreover, existing switching valves cannot effectively relieve pressure when it is too high. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a switching valve and injection pump with multiple flow channels, which solves the problems of crystallization or wear affecting service life.

[0005] The technical problem to be solved by this utility model is achieved by the following technical solution:

[0006] This utility model provides a multi-channel switching valve and an injection pump, including a stator housing, a first gasket, a second gasket, and a rotor, wherein...

[0007] The stator housing has a first recess and a second recess located within the first recess;

[0008] The second recess is used to install at least one first gasket, and at least one second gasket is installed on the first gasket;

[0009] The stator housing is provided with several sub-interfaces, wherein,

[0010] Each of the sub-interfaces is connected to its respective second flow channel through its respective first flow channel;

[0011] Each of the second flow channels has an opening formed in the second recess.

[0012] In a preferred embodiment of this invention, the second recessed portion further comprises a central flow channel, and the central flow channel also has an opening in the second recessed portion.

[0013] The central flow channel is connected to the discharge port through a discharge flow channel.

[0014] In a preferred embodiment of this invention, the cross-section of the second recessed portion includes a polygon or an ellipse, wherein...

[0015] The cross-sections of the first gasket and the second gasket are adapted to the cross-section of the second recess.

[0016] As a preferred embodiment of this utility model, both the first gasket and the second gasket are provided with openings corresponding to each of the second flow channels, as well as openings adapted to the central flow channel.

[0017] As a preferred embodiment of this utility model, the first recessed portion is further provided with at least one through hole and at least one groove, wherein,

[0018] The slot is connected to the outside.

[0019] In a preferred embodiment of this invention, the rotor portion is attached to the second gasket, wherein...

[0020] The rotor section also has a buffer mechanism;

[0021] The contact surface between the rotor and the second gasket has a flow cavity for connecting a second flow channel and a central flow channel.

[0022] As a preferred embodiment of this invention, the stator shell is made of a polymer material.

[0023] In a preferred embodiment of this invention, the first gasket is made of rubber; the second gasket is made of ceramic.

[0024] In a preferred embodiment of this utility model, the stator housing and the rotor are connected by a mounting component;

[0025] The rotor section is also equipped with a rotor housing section.

[0026] This invention also provides an injection pump having the aforementioned multi-channel switching valve.

[0027] The beneficial effects of this utility model are as follows: Through the design of the irregularly shaped first and second gaskets, this utility model achieves a tighter connection between the stator and the rotor, and the sandwich structure improves the sealing and wear resistance of the entire stator; at least one through hole is provided on the first recess, which can introduce injected warm water to rinse the crystals, reduce the risk of wear or adhesion, and avoid reducing the service life; when the pressure inside the valve head flow path is too high, or the pressure in the flow path hole is too high due to blockage, the rear end of the rotor is supported by a corrugated spring with a specific elasticity (i.e., a buffer mechanism), and the excessive pressure will lift the part where the rotor and stator are in contact and release pressure through the through hole and slot. Attached Figure Description

[0028] Figure 1 This is one of the structural schematic diagrams of this utility model;

[0029] Figure 2 This is one of the structural schematic diagrams of this utility model;

[0030] Figure 3 This is one of the structural schematic diagrams of this utility model;

[0031] Figure 4 This is one of the structural schematic diagrams of this utility model;

[0032] Figure 5 This is one of the structural schematic diagrams of this utility model;

[0033] Figure 6 This is one of the structural schematic diagrams of this utility model;

[0034] Figure 7 This is one of the structural schematic diagrams of this utility model;

[0035] Figure 8 This is one of the structural schematic diagrams of this utility model;

[0036] Figure 9 This is one of the structural schematic diagrams of this utility model;

[0037] Figure 10 This is one of the structural schematic diagrams of this utility model;

[0038] In the figure: 1. Stator housing; 11. First recess; 111. Second recess; 12. Interface; 121. First flow channel; 122. Second flow channel; 13. Central flow channel; 14. Discharge flow channel; 15. Discharge interface; 16. Through hole; 17. Slot; 2. First gasket; 3. Second gasket; 4. Rotor; 41. Buffer mechanism; 42. Flow cavity; 5. Rotor housing; 6. Mounting component. Detailed Implementation

[0039] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0040] Example 1

[0041] like Figure 1-10 As shown, this embodiment provides a multi-channel switching valve, including a stator housing 1, a first gasket 2, a second gasket 3, and a rotor 4, wherein...

[0042] The stator housing 1 has a first recess 11 and a second recess 111 located within the first recess 11; the second recess 111 is used to install at least one first gasket 2, and at least one second gasket 3 is installed on the first gasket 2; in this embodiment, the cross-section of the second recess 111 includes a polygon or an ellipse, wherein the cross-sections of the first gasket 2 and the second gasket 3 are adapted to the cross-section of the second recess 111. Compared with the traditional circular structure design, the stator polygonal (irregular, elliptical, etc.) structural design does not require additional positioning design.

[0043] Regarding the fluid distribution, a plurality of sub-ports 12 are provided on the stator housing 1, each sub-port 12 being connected to its respective second flow channel 122 via its first flow channel 121; each second flow channel 122 has an opening formed in a second recess 111. The second recess 111 also has a central flow channel 13, which also has an opening in the second recess 111, and the central flow channel 13 is connected to a discharge port 15 via a discharge flow channel 14 connected to it. Both the first gasket 2 and the second gasket 3 are provided with openings corresponding to each second flow channel 122, and openings adapted to the central flow channel 13.

[0044] The rotor part 4 is attached to the second pad 3, wherein the rotor part 4 also has a buffer mechanism 41;

[0045] The first recess 11 is also provided with at least one through hole 16 and at least one slot 17, wherein the slot 17 communicates with the outside. When the pressure inside the valve head flow path is too high, or when the pressure in the flow path hole is too high due to blockage, the rear end of the rotor is supported by a bellows spring with a specific elasticity (i.e., buffer mechanism 41). The excessive pressure will lift the part where the rotor and stator are in contact and release pressure through the through hole 16 and the slot 17. In this embodiment, the bellows spring (i.e., buffer mechanism 41) is preferably a spring with a strength of 0.7-0.9 Newtons.

[0046] The contact surface between the rotor 4 and the second gasket 3 has a flow cavity 42 for connecting a second flow channel 122 and a central flow channel 13. When the rotor 4 rotates, the flow cavity 42 can connect different branch interfaces 12 and the central flow channel 13, thereby realizing the distribution of fluid.

[0047] The stator housing 1 is made of a polymer material, including opaque, semi-transparent, and transparent materials. Opaque materials include engineering plastics such as PEEK and PPS; semi-transparent materials include PTFE and PCTFE; and transparent materials include PEI, PSU, PMMA, and PC. The first gasket 2 is made of rubber, including soft rubber materials such as fluororubber, EPDM, PTFE, and PCTFE, or corrosion-resistant adhesives such as UV adhesive, epoxy resin adhesive, and alumina ceramic adhesive. In this embodiment, EPDM is preferred, and its thickness is preferably less than 0.5 mm, serving to stabilize the second gasket 3. The second gasket 3 is made of ceramic, forming the stator portion. Preferably, the rotor portion 4 is also made of ceramic, preferably modified ceramic. The second gasket 3 and rotor portion 4 can be selected from alumina and zirconium oxide. Preferably, a RA value below 0.03 results in better performance. Preferably, the sealing diameter is greater than 2 mm.

[0048] In this embodiment, the sealing pressure of the switching valve is not less than 60 psi for positive pressure and not more than -45 psi for negative pressure.

[0049] The stator housing 1 and the rotor 4 are connected by a mounting part 6; the rotor housing 5 is also mounted on the rotor 4.

[0050] Table 1

[0051]

[0052] As can be seen from Table 1, the solution in this embodiment outperforms the traditional switching valve in all aspects.

[0053] Specifically, it effectively solves the risk of valve body leakage caused by crystallization. The visual design can detect leakage or crystallization problems in time and deal with them to reduce the risk of valve body damage. At the same time, regular liquid injection through the pressure relief hole to dissolve internal impurities and crystals can also improve its service life. Furthermore, the full ceramic surface bonding can ensure the service life of the valve body.

[0054] This invention achieves a tighter connection between the stator and rotor through the design of the irregularly shaped first gasket 2 and second gasket 3, and the sandwich structure improves the sealing and wear resistance of the entire stator. At least one through hole 16 is provided on the first recess 111, which can introduce injected warm water to rinse the crystals, reduce the risk of wear or adhesion, and avoid reducing the service life. When the pressure inside the valve head flow path is too high, or the pressure in the flow path hole is too high due to blockage, the rear end of the rotor is supported by a bellows spring with a specific elasticity (i.e., buffer mechanism 41). The excessive pressure will lift the part where the rotor and stator are in contact and release pressure through the through hole 16 and the slot 17. Since it is a full ceramic bonding seal, under the same material, the valve assembly will not have the risk of leakage due to wear caused by the inconsistency of the rotor or stator material during long-term use.

[0055] Example 2

[0056] This embodiment provides an injection pump with a multi-channel switching valve as described in Embodiment 1.

[0057] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments, and various changes and modifications can be made without departing from the spirit and scope of this utility model. All such changes and modifications fall within the scope of protection claimed by this utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A switching valve with multiple flow channels, characterized in that, It includes a stator housing (1), a first gasket (2), a second gasket (3), and a rotor (4), wherein, The stator housing (1) has a first recess (11) and a second recess (111) located within the first recess (11). The second recess (111) is used to install at least one first gasket (2), and at least one second gasket (3) is installed on the first gasket (2). The stator housing (1) is provided with a plurality of sub-interfaces (12), wherein, Each of the sub-interfaces (12) is connected to its respective second flow channel (122) through its respective first flow channel (121); Each of the second flow channels (122) has an opening formed on the second recess (111).

2. The switching valve for multi-channel switching according to claim 1, characterized in that, The second recess (111) also has a central flow channel (13), and the central flow channel (13) also has an opening formed on the second recess (111), wherein, The central flow channel (13) is connected to the discharge port (15) through the discharge flow channel (14) connected to it.

3. A multi-channel switching valve according to claim 1 or 2, characterized in that, The cross-section of the second recess (111) includes a polygon or an ellipse, wherein, The cross-sections of the first gasket (2) and the second gasket (3) are adapted to the cross-section of the second recess (111).

4. A multi-channel switching valve according to claim 2, characterized in that, Both the first gasket (2) and the second gasket (3) are provided with openings corresponding to each second flow channel (122) and openings adapted to the central flow channel (13).

5. A multi-channel switching valve according to claim 3, characterized in that, The first recess (11) is further provided with at least one through hole (16) and at least one slot (17), wherein, The slot (17) is connected to the outside.

6. A multi-channel switching valve according to claim 4 or 5, characterized in that, The rotor portion (4) is attached to the second gasket (3), wherein, The rotor (4) also has a buffer mechanism (41). The rotor (4) has a flow cavity (42) on the contact surface with the second gasket (3) for connecting a second flow channel (122) and a central flow channel (13).

7. A multi-channel switching valve according to claim 6, characterized in that, The stator housing (1) is made of polymer material.

8. A multi-channel switching valve according to claim 6, characterized in that, The first gasket (2) is made of rubber; the second gasket (3) is made of ceramic.

9. A multi-channel switching valve according to claim 7 or 8, characterized in that, The stator housing (1) and the rotor (4) are connected by a mounting member (6); The rotor part (4) is also equipped with a rotor housing part (5).

10. An injection pump, characterized in that, A switching valve having a multi-channel switching capability as described in any one of claims 1 to 9.

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