Plunger pump and fluid delivery system

Abstract

The utility model provides a kind of plunger pump and fluid delivery system, plunger pump includes pump body, plunger, drive assembly and position detection component.Pump body includes pump cavity and accommodation cavity, pump body has with the slot body structure of accommodation cavity intercommunication, slot body structure's slot direction is perpendicular to the arrangement direction of pump cavity and accommodation cavity.Plunger both ends are located in pump cavity and accommodation cavity respectively.Drive assembly includes the connecting piece being connected with plunger, the screw rod being connected with connecting piece with screw thread, and the rotation-stopping piece being connected with connecting piece and extending into slot body structure.Position detection component includes photoelectric switch, and the light barrier being located on connecting piece and extending towards slot body structure.Plunger pump is set up slot body structure, and then mechanical rotation-stopping structure and optical detection channel are integrated, so that the light path of the position-limiting movement of rotation-stopping piece and photoelectric detection shares same space, simplify the structure layout of plunger pump, reduce the structure complexity of plunger pump.

Description

Technical Field

[0001] This utility model belongs to the field of fluid control technology, specifically relating to a plunger pump and a fluid delivery system. Background Technology

[0002] In the field of piston pumps, to achieve the reciprocating motion of the piston, it is usually necessary to set up an anti-rotation structure to prevent the connecting parts (such as the nut structure) in the drive assembly from rotating with the lead screw. At the same time, in order to accurately control the piston stroke, a position detection function also needs to be integrated. Traditional designs often set the anti-rotation structure and the position detection element independently. This design leads to a complex piston pump structure, numerous processing steps, low internal space utilization, and increases assembly difficulty and manufacturing cost.

[0003] The information disclosed in this background section is intended only to enhance the understanding of the overall background of this utility model and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Utility Model Content

[0004] The purpose of this invention is to provide a plunger pump that solves the problems of complex structure in existing plunger pumps.

[0005] To achieve the above objectives, a specific embodiment of this utility model provides a plunger pump, which includes a pump body, a plunger, a drive assembly, and a position detection assembly. The pump body includes a pump chamber and a receiving chamber. A groove structure communicating with the receiving chamber is formed on the surface of the pump body, and the groove opening direction is perpendicular to the arrangement direction of the pump chamber and the receiving chamber. The two ends of the plunger are respectively located in the pump chamber and the receiving chamber. The drive assembly includes a connector located in the receiving chamber and connected to the plunger, a screw threaded to the connector and rotatable, and an anti-rotation member connected to the connector and extending into the groove structure. The position detection assembly includes a photoelectric switch and a light-blocking member disposed on the connector and extending towards the groove structure. The light emitted by the photoelectric switch is parallel to the groove opening direction of the groove structure and enters the receiving chamber through the groove structure. When the plunger moves to a preset position, the light-blocking member can block the light emitted by the photoelectric switch to change the output signal of the photoelectric switch.

[0006] In one or more embodiments of this utility model, when the plunger moves to a preset position, the volume of the pump chamber reaches its minimum value.

[0007] In one or more embodiments of this utility model, the anti-rotation member is configured as a cylindrical structure, and the circumferential surface of the anti-rotation member is in contact with the groove walls on both sides of the groove structure.

[0008] In one or more embodiments of the present invention, the plunger pump further includes a sealing ring disposed between the pump chamber and the receiving chamber, through which the plunger passes.

[0009] In one or more embodiments of the present invention, the pump body includes a first pump body and a second pump body, a pump cavity is formed in the first pump body, a receiving cavity and a groove structure are formed in the second pump body, and a sealing ring is located at the connection between the first pump body and the second pump body.

[0010] In one or more embodiments of this utility model, a first mounting groove is provided on the side of the first pump body facing the second pump body, and a second mounting groove with a diameter smaller than the first mounting groove is provided on the side of the second pump body facing the first pump body. The sealing ring includes a first sealing part and a second sealing part coaxially arranged. The first sealing part is located in the first mounting groove and the peripheral wall of the first sealing part is tightly fitted with the groove wall of the first mounting groove. The second sealing part is located in the second mounting groove and the peripheral wall of the second sealing part is tightly fitted with the groove wall of the second mounting groove.

[0011] In one or more embodiments of this utility model, the plunger pump further includes a motor fixedly connected to the pump body, the output end of the motor is connected to a lead screw, the side of the pump body facing the motor is open, and the surface of the motor facing the pump body forms a stop surface that limits the movement range of the connecting parts.

[0012] In one or more embodiments of this invention, the plunger is made of zirconia ceramic.

[0013] In one or more embodiments of this utility model, the lead screw is selected as a trapezoidal lead screw.

[0014] On the other hand, a specific embodiment of the present invention provides a fluid transport system, which includes the aforementioned plunger pump, a pumping pipeline connected to the pumping port of the plunger pump, a pumping valve provided in the pumping pipeline, a draining pipeline connected to the draining port of the plunger pump, and a draining valve provided in the draining pipeline.

[0015] In one or more embodiments of this utility model, the fluid transport system further includes a control unit. The control unit includes a communication module for communicating with a host computer, a motor control module for generating motion control signals according to the control instructions of the host computer, a motor drive module for driving the motor to rotate according to the motion control signals, an analog input module for acquiring pipeline flow signals or pressure signals, an analog output module for outputting flow control signals or pressure control signals, a digital input module for acquiring system safety status signals, and a digital output module for controlling the opening and closing of the pumping valve and the draining valve according to a preset timing sequence.

[0016] Compared with the prior art, this utility model has a groove structure on the plunger pump, which integrates the mechanical anti-rotation structure and the optical detection channel into one, so that the limiting movement of the anti-rotation component and the optical path of photoelectric detection share the same space, simplifying the structural layout of the plunger pump and reducing the structural complexity of the plunger pump. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model 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 recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a three-dimensional structural diagram of a plunger pump according to one embodiment of the present invention;

[0019] Figure 2 This is a cross-sectional view of a plunger pump according to one embodiment of the present invention;

[0020] Figure 3 This is another cross-sectional view of the plunger pump in one embodiment of the present invention;

[0021] Figure 4 This is an exploded view of the plunger pump in one embodiment of the present invention;

[0022] Figure 5 This is an exploded structural diagram of the pump body, plunger, and sealing ring in one embodiment of the present invention;

[0023] Figure 6 This is a schematic diagram of the structure of a fluid transport system in one embodiment of the present invention.

[0024] Explanation of main reference numerals in the attached drawings: 1. Pump body; 11. First pump body; 111. Pump chamber; 112. Liquid extraction port; 113. Liquid discharge port; 114. First mounting groove; 12. Second pump body; 121. Receptacle; 122. Groove structure; 123. Second mounting groove; 2. Plunger; 3. Drive assembly; 31. Connector; 32. Lead screw; 33. Anti-rotation component; 34. Motor; 4. Position detection assembly; 41. Photoelectric switch; 42. Light blocking component; 5. Sealing ring; 51. First sealing part; 52. Second sealing part; 6. Liquid extraction pipeline; 7. Liquid extraction valve; 8. Liquid discharge pipeline; 9. Liquid discharge valve; a. First reagent box; b. Second reagent box. Detailed Implementation

[0025] To enable those skilled in the art to better understand the technical solutions in this disclosure, the technical solutions in the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this disclosure, and not all embodiments. Based on the embodiments in this disclosure, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this disclosure.

[0026] In the description of this utility model, it should be understood that the terms "top", "bottom", "upper", "lower", "front", "rear", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are 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.

[0027] Furthermore, the term "first" is used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0028] In one embodiment, reference is made to Figures 1 to 4As shown, this utility model provides a plunger pump, which includes a pump body 1, a plunger 2, a drive assembly 3, and a position detection assembly 4. The pump body 1 has a pump chamber 111 and a receiving chamber 121 inside. The surface of the pump body 1 has a suction port 112, a discharge port 113, and a tank structure 122. Both the suction port 112 and the discharge port 113 are connected to the pump chamber 111 and are used to connect to corresponding infusion lines. When the plunger pump is in normal operation, under the control of the corresponding control valve, only one of the suction port 112 and the discharge port 113 can be connected to an infusion line. The tank structure 122 is connected to the receiving chamber 121 and extends approximately along a straight line in the arrangement direction of the pump chamber 111 and the receiving chamber 121, with the groove opening direction of the tank structure 122 perpendicular to the arrangement direction of the pump chamber 111 and the receiving chamber 121. The plunger 2 is generally constructed as a cylindrical structure. One end of the plunger 2 extends into the interior of the pump chamber 111, and the other end extends into the interior of the receiving chamber 121. When the plunger 2 moves along its central axis, it can change the volume of the pump chamber 111, thereby realizing the liquid inlet and outlet of the plunger pump. The drive assembly 3 is used to drive the plunger 2 to move. The drive assembly 3 includes a connector 31, a lead screw 32, and an anti-rotation member 33. The connector 31 is threadedly connected to the lead screw 32 and is also fixedly connected to the plunger 2. The anti-rotation member 33 is connected to the connector 31 and extends into the tank structure 122. When the lead screw 32 rotates, the tank wall of the tank structure 122 can restrict the rotation of the anti-rotation member 33, thus indirectly restricting the rotation of the connector 31, thereby causing relative movement between the connector 31 and the lead screw 32 to drive the plunger 2 to move. The position detection component 4 includes a photoelectric switch 41 and a light-blocking component 42 that cooperate with each other. The photoelectric switch 41 is mounted on the surface of the pump body 1. The emitting part and the receiving part of the photoelectric switch 41 are integrated into one unit. The light emitted by the photoelectric switch 41 is parallel to the slot opening direction of the slot structure 122. The light emitted by the photoelectric switch 41 enters the interior of the receiving cavity 121 through the slot structure 122. The light-blocking component 42 is disposed on the connector 31 and extends toward the slot structure 122.

[0029] When the plunger 2 moves to the preset position, the light-blocking component 42 moves into the path of the light emitted by the photoelectric switch 41 and blocks the light. At this time, the light path changes, which causes the output signal of the photoelectric switch 41 to change synchronously. The user can judge whether the plunger 2 has reached the preset position based on the change of the output signal of the photoelectric switch 41, so as to realize non-contact detection of the position of the plunger 2.

[0030] According to the above structural design, the tank structure 122 integrates the mechanical anti-rotation structure and the optical detection channel into one, so that the limiting movement of the anti-rotation component 33 and the optical path of photoelectric detection share the same space, which simplifies the structural layout of the plunger pump and reduces the structural complexity of the plunger pump.

[0031] In one embodiment, to ensure the accuracy of each operation of the plunger pump, an initial position positioning procedure (i.e., the drive assembly 3 moves the plunger 2 to the initial position) must be performed before the plunger pump is used to avoid the cumulative error from the previous use affecting the accuracy of the plunger pump in the next use. When the plunger 2 is in the initial position, the volume of the portion of the plunger 2 located in the pump chamber 111 reaches its maximum value, while the volume of the pump chamber 111 reaches its minimum value. At this time, controlling the plunger 2 to move towards the receiving cavity 121 can increase the volume of the pump chamber 111, reduce its internal pressure, and thus draw the liquid from the storage container into the pump chamber 111.

[0032] In order to accurately detect whether the plunger 2 has reached the initial position, the initial position can be set to a preset position. When the plunger 2 reaches the initial position, the light blocking member 42 just blocks the light emitted by the photoelectric switch 41, causing the output signal of the photoelectric switch 41 to change. The corresponding control unit can immediately control the plunger 2 to stop moving according to the change in the output signal.

[0033] In one embodiment, reference is made to Figure 4 As shown, the anti-rotation component 33 is a cylindrical structure, with its circumferential surface in contact with the groove walls on both sides of the groove structure 122. This design allows for a stable line contact between the anti-rotation component 33 and the groove walls, significantly reducing the frictional resistance as the anti-rotation component 33 moves along the groove structure 122 and ensuring smooth movement of the plunger 2 and the connecting component 31. Furthermore, the cylindrical structure has relatively lower requirements for machining precision, reducing manufacturing costs and assembly difficulty. In addition, the contact between the anti-rotation component 33 and the groove walls of the groove structure 122 prevents gaps between them, essentially eliminating the possibility of rotation of the connecting component 31.

[0034] In one embodiment, reference is made to Figure 4As shown, the plunger pump also includes a sealing ring 5 disposed between the pump chamber 111 and the receiving chamber 121. The plunger 2 passes through the sealing ring 5, and the peripheral wall of the plunger 2 maintains a tight fit with the sealing ring 5. The sealing ring 5 can seal and isolate the pump chamber 111 and the receiving chamber 121, preventing liquid in the pump chamber 111 from leaking into the receiving chamber 121, thus ensuring the pumping efficiency and safety of the plunger pump. Furthermore, during the movement of the plunger 2, the sealing ring 5 can also form a sealing relationship with the plunger 2, preventing liquid in the pump chamber 111 from leaking into the receiving chamber 121. In addition, the sealing ring 5 can also prevent dust and other contaminants in the receiving chamber 121 from entering the pump chamber 111 and contaminating the liquid in the pump chamber 111.

[0035] Furthermore, the pump body 1 includes a first pump body 11 and a second pump body 12 fixedly connected together by bolts or other connecting structures. A pump cavity 111 is formed in the first pump body 11, and a receiving cavity 121 and a groove structure 122 are formed in the second pump body 12. A sealing ring 5 is located at the connection between the first pump body 11 and the second pump body 12. The pump body 1 adopts a split-type structural design, which reduces the difficulty of machining and internal surface treatment of the pump cavity 111 and the receiving cavity 121, thereby reducing the overall manufacturing difficulty and cost of the plunger pump. Moreover, the split structure facilitates independent material selection and structural optimization for each component, thereby specifically improving the wear resistance, pressure resistance, or sealing performance of key areas, enhancing design flexibility and reliability.

[0036] Furthermore, referring to Figure 5 As shown, a circular first mounting groove 114 is formed on the side of the first pump body 11 facing the second pump body 12, and a circular second mounting groove 123 is formed on the side of the second pump body 12 facing the first pump body 11. The diameter of the second mounting groove 123 is smaller than that of the first mounting groove 114. When the first pump body 11 and the second pump body 12 are assembled as a whole, the central axes of the first mounting groove 114 and the second mounting groove 123 are substantially coincident. The sealing ring 5 includes a first sealing part 51 and a second sealing part 52 coaxially arranged. The first sealing part 51 is located in the first mounting groove 114, and the peripheral wall of the first sealing part 51 is tightly fitted with the groove wall of the first mounting groove 114. The second sealing part 52 is located in the second mounting groove 123, and the peripheral wall of the second sealing part 52 is tightly fitted with the groove wall of the second mounting groove 123. The sealing ring 5 adopts a stepped design with two coaxial but different diameters, which realizes axial limiting and installation positioning of the sealing ring 5 during assembly, effectively preventing the sealing effect failure caused by the misalignment, twisting or creep of the sealing ring 5, and significantly improving the reliability of the sealing ring 5.

[0037] In one embodiment, reference is made to Figure 2 and Figure 3As shown, the plunger pump also includes a motor 34 fixedly connected to the pump body 1. The motor 34 can be a stepper motor. The output end of the motor 34 is connected to the lead screw 32. The side of the pump body 1 facing the motor 34 is open, and the surface of the motor 34 facing the pump body 1 forms a stop surface that limits the movement range of the connecting member 31. This design allows the opening size of the pump body 1 facing the motor 34 to be relatively large, so that the connecting member 31 and other components can be smoothly installed into the receiving cavity 121. It also eliminates the need for a separate stop part to limit the connection member 31, simplifying the overall structural design of the plunger pump and reducing the manufacturing cost of the plunger pump.

[0038] In one embodiment, the plunger 2 is made of high-precision zirconia ceramic material, which makes the surface of the plunger 2 smoother and has extremely low surface roughness, which can greatly improve the accuracy and service life of the plunger 2.

[0039] In one embodiment, the lead screw 32 is a trapezoidal lead screw, which has reliable self-locking properties, effectively preventing the plunger 2 from unexpectedly retracting under liquid pressure and ensuring its precise holding position. Furthermore, the trapezoidal lead screw has strong load-bearing capacity and smooth operation, which can improve the stability and reliability of the transmission.

[0040] In one embodiment, reference is made to Figure 5 As shown, this utility model provides a fluid delivery system, which includes a plunger pump, a liquid extraction pipeline 6, a liquid extraction valve 7, a liquid discharge pipeline 8, and a liquid discharge valve 9 as described in the above embodiment. One end of the liquid extraction pipeline 6 is connected to the liquid extraction port 112 of the plunger pump, and the other end is used to connect to the first reagent tank a. The liquid discharge pipeline 8 is connected to the liquid discharge port 113 of the plunger pump, and the other end is used to connect to the second reagent tank b. The liquid extraction valve 7 is located on the liquid extraction pipeline 6 and is responsible for opening and closing the liquid extraction pipeline 6. The liquid discharge valve 9 is located on the liquid discharge pipeline 8 and is responsible for opening and closing the liquid discharge pipeline 8.

[0041] Furthermore, the fluid delivery system also includes a PCB board, on which a control unit is integrated. The control unit includes a communication module, a motor control module, a motor drive module, an analog input module, an analog output module, a digital input module, and a digital output module. The communication module establishes a bidirectional data connection with the host computer through a standard communication interface and communication lines. It is responsible for receiving program instructions and parameter settings from the host computer and uploading the system's real-time operating status and collected data, which is crucial for achieving remote monitoring and automated integration. The motor control module, as the core of motion control, is used to parse the control instructions from the host computer and generate precise motion control signals that conform to preset motion curves (e.g., speed, acceleration, position). The motor drive module then drives the motor 34 to rotate at the required speed and direction based on this motion control signal, thereby precisely controlling the reciprocating motion of the plunger 2. Regarding signal acquisition and output, the analog input module is used to acquire analog signals from flow sensors or pressure sensors in the pipeline in real time and convert them into digital signals for processing by the control unit, enabling continuous monitoring of the system's operating status. The analog output module outputs adjustable flow control or pressure control signals to regulate downstream valves or actuators, achieving precise flow regulation or stable pressure control. The digital input module acquires system safety status signals such as emergency stop, door opening / closing, and level alarm, providing necessary safety interlock protection for the system. The digital output module directly controls the opening and closing of the pumping valve 7 and the draining valve 9 according to the precise timing logic preset by the control unit, thus precisely coordinating with the movement of the plunger 2 to complete the entire pumping and draining process.

[0042] The various modules of the control unit work together to not only improve the anti-interference capability and reliability of the fluid transport system, but also enable complex and flexible control strategies through software programming, significantly improving the automation level, control accuracy and maintainability of the entire fluid transport system.

[0043] It will be apparent to those skilled in the art that this disclosure is not limited to the details of the exemplary embodiments described above, and that this disclosure can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of this disclosure is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this disclosure. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0044] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A plunger pump, characterized in that, The plunger pump includes: The pump body (1) includes a pump cavity (111) and a receiving cavity (121). A groove structure (122) communicating with the receiving cavity (121) is provided on the surface of the pump body (1). The groove opening direction of the groove structure (122) is perpendicular to the arrangement direction of the pump cavity (111) and the receiving cavity (121). The plunger (2) has its two ends located in the pump chamber (111) and the receiving chamber (121) respectively; The drive assembly (3) includes a connector (31) located in the accommodating cavity (121) and connected to the plunger (2), a screw (32) threaded to the connector (31) and rotatable, and an anti-rotation member (33) connected to the connector (31) and extending into the groove structure (122). The position detection component (4) includes a photoelectric switch (41) and a light-blocking member (42) disposed on the connector (31) and extending toward the groove structure (122). The light emitted by the photoelectric switch (41) is parallel to the groove opening direction of the groove structure (122) and enters the receiving cavity (121) through the groove structure (122). When the plunger (2) moves to the preset position, the light blocking member (42) can block the light emitted by the photoelectric switch (41) to change the output signal of the photoelectric switch (41).

2. The plunger pump according to claim 1, characterized in that, When the plunger (2) moves to the preset position, the volume of the pump chamber (111) reaches the minimum value.

3. The plunger pump according to claim 1, characterized in that, The anti-rotation component (33) is configured as a cylindrical structure, and the circumferential surface of the anti-rotation component (33) is in contact with the groove walls on both sides of the groove structure (122).

4. The plunger pump according to claim 1, characterized in that, The plunger pump also includes a sealing ring (5) disposed between the pump chamber (111) and the receiving chamber (121), and the plunger (2) passes through the sealing ring (5).

5. The plunger pump according to claim 4, characterized in that, The pump body (1) includes a first pump body (11) and a second pump body (12). The pump chamber (111) is formed in the first pump body (11), the accommodating cavity (121) and the groove structure (122) are formed in the second pump body (12), and the sealing ring (5) is located at the connection between the first pump body (11) and the second pump body (12).

6. The plunger pump according to claim 5, characterized in that, The first pump body (11) has a first mounting groove (114) on the side facing the second pump body (12), and the second pump body (12) has a second mounting groove (123) with a diameter smaller than the first mounting groove (114) on the side facing the first pump body (11). The sealing ring (5) includes a first sealing part (51) and a second sealing part (52) arranged coaxially. The first sealing part (51) is located in the first mounting groove (114) and the peripheral wall of the first sealing part (51) is tightly fitted with the groove wall of the first mounting groove (114). The second sealing part (52) is located in the second mounting groove (123) and the peripheral wall of the second sealing part (52) is tightly fitted with the groove wall of the second mounting groove (123).

7. The plunger pump according to claim 1, characterized in that, The plunger pump also includes a motor (34) fixedly connected to the pump body (1). The output end of the motor (34) is connected to the lead screw (32). The side of the pump body (1) facing the motor (34) is open. The surface of the motor (34) facing the pump body (1) forms a stop surface that limits the movement range of the connecting member (31).

8. The plunger pump according to claim 1, characterized in that, The plunger (2) is made of zirconium oxide ceramic; and / or, The lead screw (32) is a trapezoidal lead screw.

9. A fluid transport system, characterized in that, The fluid delivery system includes a plunger pump as described in any one of claims 1 to 8, a pumping line (6) connected to the pumping port (112) of the plunger pump, a pumping valve (7) provided in the pumping line (6), a draining line (8) connected to the draining port (113) of the plunger pump, and a draining valve (9) provided in the draining line (8).

10. The fluid transport system according to claim 9, characterized in that, The fluid transport system further includes a control unit, which includes a communication module for communicating with a host computer, a motor control module for generating motion control signals according to the control instructions of the host computer, a motor drive module for driving the motor to rotate according to the motion control signals, an analog input module for acquiring pipeline flow signals or pressure signals, an analog output module for outputting flow control signals or pressure control signals, a digital input module for acquiring system safety status signals, and a digital output module for controlling the opening and closing of the pumping valve (7) and the draining valve (9) according to a preset timing sequence.

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