Multi-unit one-way valve device and graphene slurry pumping system

Abstract

The utility model discloses a multi-unit one-way valve device and a graphene slurry pumping system, which comprise a plunger pump, the multi-unit one-way valve device is arranged in the plunger pump, and the multi-unit one-way valve device comprises a plurality of valve units which are sequentially connected in series along the conveying direction of fluid. Each valve unit comprises a valve body with the two ends provided with an inlet and an outlet respectively, a flow channel communicated with the inlet and the outlet is arranged in the valve body, a valve element assembly enabling fluid to only flow towards the outlet direction is arranged in the flow channel, and the inlets and the outlets of any two adjacent valve units are directly and fixedly connected in a detachable mode and communicated with each other. The utility model provides a multi-unit one-way valve device and a graphene slurry pumping system. The multi-unit one-way valve device and the graphene slurry pumping system can carry out one-way flow control on fluid with particles under the pressure environment of 100 MPA or above.

Description

Technical Field

[0001] This utility model relates to the technical field of graphene slurry pumping, specifically a multi-unit check valve device and a graphene slurry pumping system incorporating the multi-unit check valve device. Background Technology

[0002] In the industrial preparation of graphene powder, homogenization of graphene slurry using a homogenizer is extremely important. Therefore, as the requirements of graphene processing become increasingly stringent, the working pressure requirements for graphene slurry are also rising. Currently, most liquid pumps capable of pressurizing fluids to over 100 MPa employ a plunger pump structure. The basic working principle of existing plunger pumps is that the reciprocating motion of the piston rod, combined with the unidirectional flow function of a check valve, allows for fluid suction followed by pressurization and pumping. However, existing plunger pump structures are designed for liquid environments, such as water jet pumps used for water pressurization. Existing ultra-high pressure water jet pumps can pressurize pure water to over 100 MPa, even reaching 200 MPa. However, these existing plunger pumps cannot meet the pressure requirements when pressurizing graphene slurry. The reason for this is that, during the reciprocating motion of the check valve in the existing plunger pump, solid particles contained in the fluid accumulate at the sealing port of the check valve as it repeatedly enters and exits, making it difficult for the check valve to achieve a normal seal. Therefore, the existing plunger pump cannot pressurize the fluid containing solid particles to the same or similar pressure value as the pure liquid medium. Utility Model Content

[0003] The present invention aims to at least partially solve one of the technical problems in the related art: to provide a multi-unit one-way valve device and a graphene slurry pumping system, which can control the unidirectional flow of fluid containing particulate matter under a pressure environment of more than 100 MPa.

[0004] Therefore, the first objective of this invention is to provide a multi-unit one-way valve device, comprising multiple valve units sequentially connected in series along the fluid transport direction. Each valve unit includes a valve body with an inlet and an outlet at each end, and a flow channel within the valve body connecting the inlet and outlet. This flow channel contains a valve core assembly that allows fluid to flow only in the outlet direction. The inlet and outlet of any two adjacent valve units are detachably and directly fixedly connected and interconnected. By connecting multiple valve units capable of one-way valve functions in series, good overall sealing is maintained during the transport of fluids containing particulate matter under high pressure. Furthermore, the direct fixed connection between the multiple valve units results in a more compact structure, shortens the fluid transport path, reduces pressure loss, and eliminates the need for intermediate high-pressure pipes, reducing the likelihood of leakage with fewer interfaces, resulting in a smaller footprint and lower overall equipment cost.

[0005] According to an example of the present invention, the flow channel of the valve body has a receiving cavity. The valve core assembly includes a thrust spring, a valve core block, a dynamic seal, and a static seal arranged in sequence. The valve core block is installed into the receiving cavity through the bottom of the inlet groove and slides in cooperation with the receiving cavity. The thrust spring is located on the side of the valve core block near the outlet, the dynamic seal is located on the other side of the valve core block, and the static seal is disposed in the inlet. The outlet of the previous valve unit abuts against the static seal in the inlet so that the static seal is in close contact with the bottom of the inlet groove. The static seal has a central through hole, and the outlet of the previous valve unit communicates with the central through hole. The valve core block drives the dynamic seal to reciprocate so that the dynamic seal closes the central through hole of the static seal or the dynamic seal separates from the static seal to form a spaced channel for fluid to pass through. The inlet and outlet of adjacent valve units are directly connected, and the entire flow channel formed by this can effectively withstand high-pressure environments, especially fluid pressures exceeding 100 MPa. At the same time, due to the presence of multiple valve units, the overall sealing performance is improved, and the unidirectional flow control of the fluid is effective.

[0006] According to one example of the present invention, the dynamic seal is a sphere, and the valve core block has a mounting groove for accommodating the dynamic seal.

[0007] According to one example of this utility model, the central through hole is located on the end face of the static seal, corresponding to the position of the dynamic seal, and the hardness of the dynamic seal is greater than that of the static seal. After the dynamic and static seals come into contact, the difference in their hardness allows the orifice of the static seal to be compressed and deformed by the dynamic seal until it matches the contact surface of the dynamic seal, thus improving sealing performance.

[0008] According to one example of the present invention, a gap space is left between the valve core block and the receiving cavity for fluid to pass through, and the valve core block has a connecting channel, one end of which is connected to the gap space and the other end is connected to the outlet.

[0009] According to one example of this utility model, the dynamic seal in the first valve unit is a block structure, with matching conical surfaces on both the dynamic and static seals, and a sealing ring is provided on the conical surface of the dynamic seal; the dynamic seals in the remaining valve units are all spherical. The block structure of the dynamic seal in the first valve unit, combined with the conical surface and sealing ring, provides better sealing performance. The subsequent valve units use spherical dynamic seals, thus offering better pressure resistance. The combined use of these two types of valve units improves both overall sealing performance and pressure resistance, enabling its application in fluid booster equipment for higher pressure environments to pressurize fluids containing solid particles.

[0010] According to one example of this utility model, the outlet of the preceding valve unit in any two adjacent valve units is provided with an axially protruding post. This post is configured to allow insertion into the inlet of the corresponding following valve unit and to be fixed and sealed to the inner wall of the inlet. The outlet of the preceding valve unit is located on the post and communicates with the inlet of the following valve unit. The inlet of the first valve unit is provided with an inlet connector, which has a plug with the same structure as the post. The inlet interface has a liquid inlet channel communicating with the inlet of the first valve unit, and the plug of the inlet connector abuts against the static seal in the valve body. The post not only enables direct fixed connection between the post and the inlet of the adjacent valve unit, but also compresses the static seal inside the inlet, simultaneously fixing the static seal.

[0011] According to one example of this invention, the end face of the protruding post is an outwardly convex arc surface. The arc surface ensures line contact between the protruding post and the static seal, thus improving sealing performance.

[0012] According to one example of this utility model, it also includes a cylindrical outer shell with a main slurry outlet at the front end and an installation port at the rear end. Each valve unit is sequentially installed into the outer shell through the installation port. A detachable mounting base is provided on the installation port, which pushes each valve unit to fit tightly into the outer shell. The mounting base has a main slurry inlet connected to the inlet of the first valve unit. The outer shell design allows multiple valve units to connect their inlets and outlets by abutting against each other, eliminating the need for connecting components between the inlets and outlets and improving reliability.

[0013] According to one example of the present invention, in any two adjacent valve units, the static seal of the latter valve unit is fixedly connected to the valve body of the former valve unit, and the central through hole of the static seal is connected to the outlet of the former valve unit.

[0014] The second objective of this invention is to provide a graphene slurry pumping system, including a plunger pump, wherein the plunger pump includes the aforementioned multi-unit check valve device.

[0015] The above technical solution has the following advantages or beneficial effects: First, using multiple valve units with one-way valve functions in series provides better sealing performance compared to a single one-way valve, thus enabling its application in pressurization equipment for high-pressure fluids containing solid particles, especially in plunger pumps for graphene slurries exceeding 100 MPa. Second, the inlet and outlet of adjacent valve units are directly fixedly connected, reducing the overall pipeline length and eliminating the need for high-pressure pipes. Therefore, pressure loss during high-pressure fluid flow between valve units is low, resulting in lower overall equipment cost and a lower probability of leakage. Third, the dynamic seal of the first valve unit uses a block structure combined with a sealing ring for better sealing performance, while the dynamic seals of the remaining valve units use a spherical structure, providing higher pressure resistance. The combination of these two features ensures a balance between sealing performance and pressure resistance. Finally, installing multiple valve units through a housing allows adjacent valve units to be directly connected by abutting each other, avoiding the need for additional connecting components between the inlet and outlet of two valve units. This results in a more robust overall structure and better sealing performance.

[0016] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0017] Figure 1 This is a structural schematic diagram of the multi-unit check valve device of this utility model.

[0018] Figure 2 for Figure 1 A schematic diagram of the disassembled structure of each valve unit.

[0019] Figure 3 for Figure 1 A magnified view of a portion of region "A".

[0020] Figure 4 for Figure 1 A magnified view of a portion of region "B".

[0021] Figure 5 for Figure 2 A schematic diagram of the structure of a single valve unit.

[0022] Figure 6 This is a schematic diagram of the multi-unit check valve device with a housing according to the present invention.

[0023] Among them, 100 is the valve unit; 200 is the outer casing; 201 is the main slurry outlet; 202 is the mounting port; 300 is the mounting base; and 301 is the main slurry inlet.

[0024] 1. Valve body; 2. Inlet; 3. Outlet; 4. Receiving cavity; 4.1. Stepped surface; 5. Valve core block; 5.1. Mounting groove; 6. Thrust spring; 7. Dynamic seal; 8. Static seal; 8.1. Central through hole; 9. Spacing channel; 10. Gap space; 11. Connection channel; 12. Sealing ring; 13. Protrusion; 13.1. Arc surface; 14. Inlet connector; 14.1. Liquid inlet channel; 15. Plug; 16. Outer sealing ring; 17 / 18. Inspection hole. Detailed Implementation

[0025] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0026] The multi-unit check valve device and graphene slurry pumping system according to embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0027] The fluids mentioned below include, but are not limited to, graphene slurry.

[0028] In the following text, "multiple" refers to two or more.

[0029] This utility model provides a multi-unit one-way valve device, as shown in the figure, which includes multiple valve units 100 arranged in series along the fluid conveying direction. Each valve unit 100 includes a valve body 1 with an inlet 2 and an outlet 3 at both ends. The valve body 1 has a flow channel that connects the inlet 2 and the outlet 3. The flow channel is provided with a valve core assembly that allows the fluid to flow only in the direction of the outlet 3. The inlet 2 and outlet 3 of any two adjacent valve units 100 are detachably and directly fixedly connected and interconnected.

[0030] In this embodiment, the series connection means that the outlet 3 of the previous valve unit 100 is connected to the inlet 2 of the next valve unit 100, and so on, so that all the valve units 100 form a fluid flow conveying channel. At this time, any valve unit 100 is connected in series with the adjacent valve unit 100.

[0031] In this embodiment, the direct fixed connection refers to the direct connection of the valve bodies 1 of the two valve units 100 during the process of connecting the outlet 3 of the preceding valve unit 100 to the inlet 2 of the following valve unit 100, without the need for connection through a high-pressure pipe. This method not only shortens the overall path length, reduces pressure loss during fluid transportation, and lowers costs, but also reduces the problem of multiple interfaces caused by the setting of high-pressure pipes, thereby reducing leakage points and the probability of leakage, resulting in lower overall equipment operating costs.

[0032] In the above embodiment, the valve core assembly achieves a one-way constraint function. That is, when fluid flows in from inlet 2 and towards outlet 3, the valve core assembly is in the open state, allowing the fluid to pass smoothly through the valve core assembly. Conversely, when the fluid tends to flow back towards inlet 2, the valve core assembly switches to the closed state, thereby achieving one-way flow of fluid within the valve body. The valve unit 100 with the valve core assembly can be understood as a one-way valve unit. Compared to the single one-way valve in the existing plunger pump, the multi-unit one-way valve device in this embodiment can directly replace the structure of the single one-way valve in the existing plunger pump. By connecting multiple one-way valves in series, the sealing problem is effectively solved. Moreover, compared to a single one-way valve, multiple one-way valves connected in series can distribute the pressure, reducing the pressure borne by each one-way valve and extending its lifespan.

[0033] Based on the preferred embodiment described above, the flow channel of the valve body 1 has a receiving cavity 4, such as... Figures 1-2 As shown, the left end of the receiving cavity 4 is connected to the outlet 3. The inner diameter of the outlet 3 at this connection is smaller than the inner diameter of the receiving cavity 4, thus forming a stepped surface 4.1 at the left end of the receiving cavity 4. The right end of the receiving cavity 4 is located at the bottom of the groove of the inlet 2. The inner diameter of the inlet 2 is larger than the inner diameter of the receiving cavity 4. The valve core assembly includes a thrust spring 6, a valve core block 5, a dynamic seal 7, and a static seal 8 arranged in sequence. The valve core block 5 is inserted into the receiving cavity 4 through the bottom of the groove of the inlet 2 and slides in cooperation with the receiving cavity 4. The thrust spring 6 is located on the side of the valve core block 5 near the outlet 3. The two ends of the thrust spring 6 abut against the stepped surface 4.1 and the valve core block 5, respectively. The dynamic seal 7 is located on the other side of the valve core block 5, and the static seal 8... The sealing element 8 is disposed in the inlet 2, and the outlet 3 in the previous valve unit 100 abuts against the static sealing element 8 in the inlet 2, so that the static sealing element 8 is in close contact with the bottom of the groove of the inlet 2. The static sealing element 8 has a central through hole 8.1, and the outlet 3 in the previous valve unit 100 communicates with the central through hole 8.1. The action on the fluid valve core block 5 in the flow channel drives the valve core block 5 to reciprocate along the axial direction of the receiving cavity 4. The valve core block 5 drives the dynamic sealing element 7 on the right end of the valve core block 5 to reciprocate synchronously, so that the dynamic sealing element 7 closes the central through hole 8.1 of the static sealing element 8 or the dynamic sealing element 7 separates from the static sealing element 8 to form a spacer channel 9 for fluid to pass through. When the valve core block 5 drives the dynamic seal 7 to move to the right, the dynamic seal 7 abuts against the static seal 8 and blocks the central through hole 8.1 of the static seal 8, thereby closing the central through hole 8.1; when the valve core block 5 drives the dynamic seal 7 to move to the left, the dynamic seal 7 moves away from the static seal 8, leaving a gap channel 9 between the dynamic seal 7 and the static seal 8 for fluid to pass through.

[0034] In a preferred embodiment of the above, the dynamic seal 7 is a sphere, and the valve core block 5 has a mounting groove 5.1 for accommodating the dynamic seal 7.

[0035] Furthermore, the central through hole 8.1 is located on the end face of the static seal 8, corresponding to the position of the dynamic seal 7, and the hardness of the dynamic seal 7 is greater than that of the static seal 8. For example... Figure 3 As shown, the connection between the inner wall of the central through hole 8.1 and the left end face of the static seal 8 forms a sharp annular edge. When the dynamic seal 7 moves to the right and abuts against the annular edge, the dynamic seal 7 has a high hardness, which can drive the annular edge to deform. The deformed annular edge matches the outer contour of the dynamic seal 7, thereby further improving the sealing effect.

[0036] Specifically, the dynamic seal 7 is made of ceramic material with a Rockwell hardness value of HRC90-100. The static seal 8 is made of 630 stainless steel with a Rockwell hardness value of HRC30~36.

[0037] like Figure 2 As shown, when the valve core block 5 drives the dynamic seal 7 to move to the left and is in the open state, the fluid needs to flow further towards the outlet 3 on the left side of the valve body 1 after passing through the spacer channel 9. Therefore, in order to construct the flow channel between the spacer channel 9 and the outlet 3, the improvement of this embodiment is that: a gap space 10 for fluid to pass through is left between the valve core block 5 and the receiving cavity 4, and the valve core block 5 has a connecting channel 11. One end of the connecting channel 11 is connected to the gap space 10, and the other end passes through the left end face of the valve core block 5 and is connected to the outlet 3.

[0038] like Figures 1-4 As shown, preferably, the dynamic seal 7 in the first valve unit 100 has a block structure, such as... Figure 4 As shown, the dynamic seal 7 has a conical surface, and the static seal 8 has a conical surface that matches the conical surface of the dynamic seal 7. A sealing ring 12 is provided on the conical surface of the dynamic seal 7. The dynamic seals 7 in the remaining valve units 100 are all spherical. In this embodiment, the sealing ring 12 is an O-ring 12. The use of a block-shaped dynamic seal 7 in conjunction with the O-ring 12 results in better sealing performance between the dynamic seal 7 and the static seal 8 compared to a spherical dynamic seal 7. Even if a small amount of graphene particles adhere to the seal, it can still be sealed by the elasticity of the seal and the sealing ring 12. However, its pressure-bearing capacity is weak, and its service life is short, easily worn out after repeated use. The spherical dynamic seal 7, on the other hand, has a strong pressure-bearing capacity. Therefore, in this embodiment, the dynamic seal 7 in the first valve unit 100 adopts a block structure to ensure sealing performance, while the remaining valve units 100 adopt a spherical dynamic seal 7 structure, resulting in higher overall pressure-bearing performance and more reliable equipment operation.

[0039] Preferably, the dynamic seal 7 in the first valve unit 100 is a block structure, and the dynamic seal 7 and the valve core block 5 are an integral structure.

[0040] In a preferred embodiment, the valve body 1 has a detection hole 17 on its side wall, which communicates with the inlet 2 at the position corresponding to the static seal 8. The detection hole 17 allows detection of whether fluid in the flow channel leaks through the mating surfaces on both sides of the static seal 8.

[0041] Based on one of the preferred examples of direct fixed connection between two adjacent valve units 100 in the above embodiments:

[0042] like Figure 1 and Figure 2 As shown, the outlet 3 of any two adjacent valve units 100 is provided with an axially protruding protrusion 13. The protrusion 13 is configured to allow insertion into the inlet 2 of the corresponding subsequent valve unit 100 and to be fixed and sealed to the inner wall of the inlet 2. The outlet 3 of the preceding valve unit 100 is located on the protrusion 13 and communicates with the inlet 2 of the subsequent valve unit 100. The inlet 2 of the first valve unit 100 is provided with an inlet connector 14. The inlet connector 14 is provided with a plug 15 with the same structure as the protrusion 13. The inlet connector 14 has a liquid inlet channel 14.1 communicating with the inlet 2 of the first valve unit 100, and the plug 15 of the inlet connector 14 abuts against the static seal 8 in the valve body 1.

[0043] Preferably, the protrusion 13 and the valve body 1 are an integral structure. The dimensions of the protrusion 13 are adapted to the dimensions of the corresponding inlet 2.

[0044] Specifically, the outer side wall of the protrusion 13 has external threads, and the inner side wall of the inlet 2 has internal threads. When the protrusion 13 is inserted into the corresponding inlet 2, the outer side wall of the protrusion 13 and the inner side wall of the inlet 2 are threadedly fixed and the connection is sealed.

[0045] Based on the preferred embodiments described above, such as Figure 3 As shown, the end face of the protruding post 13 is an outwardly convex arc surface 13.1. Specifically, the right end face of the static seal 8 is a plane, and the arc surface 13.1 of the protruding post 13 abuts against the right end face of the static seal 8, thereby making the contact between the two a line contact and improving the sealing effect.

[0046] Based on the preferred embodiments described above, such as Figure 4As shown, the end face of the plug 15 that abuts against the static seal 8 has the same arc surface structure as the arc surface 13.1 on the protruding post 13. That is, the end of the plug 15 located inside the inlet of the first valve unit 100 has an outwardly convex arc surface 13.1 for abutting against the static seal 8. Specifically, the right end face of the static seal 8 in the first valve unit 100 is flat, and the arc surface on the plug 15 abuts against the right end face of the static seal 8, thereby making the contact between the two a line contact, improving the sealing effect.

[0047] A second preferred example based on the above embodiments, where two adjacent valve units 100 are directly and fixedly connected:

[0048] like Figure 6 As shown, the multi-unit one-way valve device of this embodiment also includes a cylindrical outer shell 200. The front end of the outer shell 200 has a slurry outlet 201 and the rear end has an installation port 202. Each valve unit 100 is sequentially installed into the outer shell 200 through the installation port 202. The installation port 202 is provided with a detachable installation base 300. The installation base 300 pushes each valve unit 100 to fit tightly into the outer shell 200. The installation base 300 has a slurry inlet 301 that communicates with the inlet 2 of the first valve unit 100.

[0049] Specifically, the mounting base 300 is threadedly connected to the mounting hole 202. As the mounting base 300 rotates and tightens, it axially presses the first valve unit 100 inward until all valve units 100 are clamped between the mounting base 300 and the left end face of the inner cavity of the housing 200. Figure 6 As shown, the mounting base 300 abuts against the static seal 8 in the first valve unit 100, and the static seal 8 abuts against the inlet 2 at the right end of the valve body 1.

[0050] Preferably, in any two adjacent valve units 100, the static seal 8 of the latter valve unit 100 is fixedly connected to the valve body 1 of the former valve unit 100, and the central through hole 8.1 of the static seal 8 communicates with the outlet 3 of the former valve unit 100. Specifically, the static seal 8 and the valve body 1 of the former valve unit 100 are an integral structure.

[0051] Preferably, an outer sealing ring 16 is provided on the outer side wall of the valve body 1 to seal the gap between the inner side wall of the outer casing 200 and the outer side wall of the valve body 1.

[0052] Preferably, the outer wall of the housing 200 has a plurality of detection holes 18 communicating with the inner cavity of the housing 200. The plurality of detection holes 18 are respectively connected to the space between any two adjacent valve units 100 and the space between the mounting base 300 and the first valve unit 100. The detection holes 18 can be used to detect whether there is leakage of fluid in the flow channel.

[0053] like Figure 1 and Figure 6 As shown, the valve unit 100 is preferably three, with the fluid flow direction from right to left. The valve unit 100 on the right is the first valve unit 100, and the others are arranged sequentially to the left as the second and last valve units 100. It should be understood that the outlet of the last valve unit 100 does not need to match the inlet of the next valve unit 100. Figure 1 There is no need to add a protruding post 13 to the outlet of the last valve unit 100. Therefore, the outlet of the last valve unit 100 can be configured to be compatible with the external interface as needed.

[0054] This utility model provides a graphene slurry pumping system, including a plunger pump, wherein the plunger pump includes the multi-unit check valve device described in the above embodiment.

[0055] It should be noted that in the description of this utility model, the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0056] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0057] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0058] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0059] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0060] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

[0061] For those skilled in the art, various changes and modifications will undoubtedly be apparent after reading the above description. Therefore, the appended claims should be considered as covering all changes and modifications that encompass the true intent and scope of this utility model. Any and all equivalent scope and content within the scope of the claims should be considered as still falling within the intent and scope of this utility model.

Claims

1. A multi-unit check valve device, characterized in that: The system includes multiple valve units (100) arranged in series along the fluid transport direction. Each valve unit (100) includes a valve body (1) with an inlet (2) and an outlet (3) at both ends. The valve body (1) has a flow channel that connects the inlet (2) and the outlet (3). The flow channel is provided with a valve core assembly that allows the fluid to flow only in the direction of the outlet (3). The inlet (2) and outlet (3) of any two adjacent valve units (100) are directly fixedly connected and interconnected in a detachable manner.

2. The multi-unit check valve device according to claim 1, characterized in that: The valve body has a receiving cavity (4) in the flow channel. The valve core assembly includes a thrust spring (6), a valve core block (5), a dynamic seal (7), and a static seal (8) arranged in sequence. The valve core block (5) is inserted into the receiving cavity (4) through the bottom of the groove of the inlet (2) and slides in cooperation with the receiving cavity (4). The thrust spring (6) is located on the side of the valve core block (5) near the outlet (3). The dynamic seal (7) is located on the other side of the valve core block (5). The static seal (8) is located in the inlet (2) and the outlet (3) of the previous valve unit (100) is also located in the receiving cavity (4). The valve core block (5) abuts against the static seal (8) in the inlet (2) so that the static seal (8) is in close contact with the bottom of the groove of the inlet (2). The static seal (8) has a central through hole (8.1). The outlet (3) in the previous valve unit (100) is connected to the central through hole (8.1). The valve core block (5) drives the dynamic seal (7) to move back and forth so that the dynamic seal (7) closes the central through hole (8.1) of the static seal (8) or the dynamic seal (7) separates from the static seal (8) to form a spacer channel (9) for fluid to pass through.

3. The multi-unit check valve device according to claim 2, characterized in that: The dynamic seal (7) is a ball, and the valve core block (5) has a mounting groove (5.1) for accommodating the dynamic seal (7).

4. The multi-unit check valve device according to claim 3, characterized in that: The central through hole (8.1) is located on the end face of the static seal (8) and its position corresponds to that of the dynamic seal (7), and the hardness of the dynamic seal (7) is greater than that of the static seal (8).

5. The multi-unit check valve device according to claim 2, characterized in that: There is a gap space (10) between the valve core block (5) and the receiving cavity (4) for fluid to pass through, and the valve core block (5) has a connecting channel (11), one end of the connecting channel (11) is connected to the gap space (10), and the other end is connected to the outlet (3).

6. The multi-unit check valve device according to claim 2, characterized in that: The dynamic seal (7) in the first valve unit (100) is a block structure. The dynamic seal (7) and the static seal (8) have matching conical surfaces. A sealing ring (12) is provided on the conical surface of the dynamic seal (7). The dynamic seals (7) in the other valve units (100) are all spheres.

7. The multi-unit check valve device according to any one of claims 1-6, characterized in that: The outlet (3) of any two adjacent valve units (100) is provided with a protruding post (13) that protrudes outward along the axis. The protruding post (13) is configured to allow insertion into the inlet (2) of the corresponding next valve unit (100) and to be fixed and sealed to the inner wall of the inlet (2). The outlet (3) of the first valve unit (100) is located on the protruding post (13) and communicates with the inlet (2) of the next valve unit (100). The inlet (2) of the first valve unit (100) is provided with an inlet connector (14). The inlet connector (14) is provided with a plug (15) with the same structure as the protruding post (13). The inlet connector (14) has a liquid inlet channel (14.1) that communicates with the inlet (2) of the first valve unit (100). The plug (15) of the inlet connector (14) abuts against the static seal (8) in the valve body (1).

8. The multi-unit check valve device according to claim 7, characterized in that: The end face of the protruding post (13) is an outwardly convex arc surface (13.1).

9. The multi-unit check valve device according to any one of claims 2-6, characterized in that: It also includes a cylindrical outer shell (200), with a slurry outlet (201) at the front end and an installation port (202) at the rear end. Each valve unit (100) is sequentially installed into the outer shell (200) through the installation port. The installation port (202) is provided with a detachable installation base (300), which pushes each valve unit (100) to fit tightly into the outer shell (200). The installation base (300) has a slurry inlet (301) that is connected to the inlet (2) of the first valve unit (100).

10. The multi-unit check valve device according to claim 9, characterized in that: In any two adjacent valve units (100), the static seal (8) of the latter valve unit (100) is fixedly connected to the valve body (1) of the former valve unit (100), and the central through hole (8.1) of the static seal (8) is connected to the outlet (3) of the former valve unit (100).

11. A graphene slurry pumping system, comprising a plunger pump, characterized in that: The plunger pump includes a multi-unit check valve device according to any one of claims 1-10.

Images