Precise numerical control single-head ceramic linear liquid injection pump

Abstract

The utility model discloses a kind of precision numerical control single-head ceramic linear liquid injection pump, belong to fluid control equipment technical field.The liquid injection pump includes drive assembly and ceramic pump core assembly, ceramic pump core assembly contains ceramic cavity ceramic rotating rod and ceramic movable rod, ceramic cavity is equipped with liquid inlet and liquid outlet, two rods are coaxially installed in cavity and are equipped with the ceramic rod body that inserts cavity and seals cooperation, ceramic rod body outer circumferential side is smooth curved surface.Drive assembly includes rotary drive part and linear drive part, rotary drive part drives ceramic rotating rod to rotate to switch liquid inlet and outlet, linear drive part drives ceramic movable rod reciprocating to change cavity volume.It is simple and compact in structure, can avoid scratching sealing component, without O-ring and easily damaged parts such as check valve, reduce failure and maintenance cost, prevent fluid crystallization pump, improve liquid injection stability and accuracy, prolong equipment service life, suitable for fluid metering and conveying in chemical, semiconductor, pharmaceutical, electronic cigarette, new energy and other industries.

Description

Technical Field

[0001] This utility model relates to the field of liquid injection pump technology, specifically to a precision CNC single-head ceramic linear liquid injection pump, which is suitable for fluid metering and transportation in the chemical, semiconductor, pharmaceutical, e-cigarette, and new energy industries. Background Technology

[0002] In fluid metering and transportation scenarios in industries such as chemical, semiconductor, pharmaceutical, e-cigarette, and new energy, ceramic plunger injection pumps are widely used due to their corrosion resistance and precision potential. However, there are still many technical defects in existing injection pumps that need to be addressed.

[0003] Ceramic plunger injection pumps with O-ring seals require a check valve to achieve the sealing function. However, both the O-ring and the check valve assembly are consumable parts that are prone to damage during long-term use. This not only directly leads to a decrease in injection accuracy but also requires frequent replacement of parts to maintain equipment operation, significantly increasing maintenance costs. In addition, after injection, this type of injection pump is prone to dripping at the needle tip. These residual fluid droplets may damage subsequent processed products and affect product quality.

[0004] Traditional ceramic self-sealing injection pumps have significant shortcomings in their structural design. Because their ceramic moving rods are directly exposed to the air, and fluid media (especially electrolytes) are prone to crystallization upon contact with air, crystal particles adhere to the surface of the ceramic moving rods. In addition, the fitting clearance of the self-sealing structure is only 3-5μm, and even tiny crystal particles can obstruct the movement of the ceramic moving rods, causing pump jamming. Furthermore, once the pump is jammed, the pump core is difficult to remove and disassemble, making repairs difficult and time-consuming. This not only further increases maintenance costs but also causes production interruptions, seriously affecting production capacity. This pump jamming problem has become a long-standing pain point and difficulty in the industry.

[0005] In addition, the ceramic rotating rod of traditional ceramic self-sealing injection pumps has a relatively sharp cross-section design. During equipment installation, the sharp cross-section can easily cut the auxiliary sealing component of the plug seal. As a key auxiliary sealing structure, the plug seal will lose its sealing function once it is damaged. Under high pressure conditions in the cavity, fluid can easily seep out from the mating gap between ceramic components, leading to seal failure and affecting the sealing reliability and operational stability of the equipment. Summary of the Invention

[0006] To address the shortcomings of existing technologies, this utility model provides a precision CNC single-head ceramic linear injection pump, aiming to solve the technical problems of existing injection pumps, such as numerous vulnerable parts, high maintenance costs, easy pump jamming, easy damage to seals, and insufficient injection accuracy.

[0007] To address the aforementioned technical problems, this utility model discloses a precision CNC single-head ceramic linear injection pump, comprising a drive assembly and a ceramic pump core assembly. The ceramic pump core assembly includes a ceramic cavity, a ceramic rotating rod, and a ceramic movable rod. The ceramic cavity has an inlet and an outlet. The ceramic rotating rod and the ceramic movable rod are coaxially mounted inside the ceramic cavity. Both the ceramic rotating rod and the ceramic movable rod have ceramic rod bodies that are inserted into and sealed with the ceramic cavity. The outer peripheral surface of the ceramic rod body is a smooth curved surface. The drive assembly includes a rotary drive and a linear drive. The rotary drive is used to drive the ceramic rotating rod to rotate around the central axis of the ceramic cavity to achieve alternating connection and unidirectional sealing of the inlet and outlet of the ceramic cavity. The linear drive is used to drive the ceramic movable rod to reciprocate along the axial direction of the ceramic cavity to change the internal volume of the ceramic cavity.

[0008] The sealing fit between the ceramic rod and the ceramic cavity is a gap seal fit, and the size range of the sealing fit gap is 3 to 5 micrometers.

[0009] The ceramic rotating rod has a flow channel on its ceramic body. The flow channel is connected to the liquid inlet or liquid outlet of the ceramic cavity as the ceramic rotating rod rotates, so as to realize the alternating switching between the liquid inlet and the liquid outlet.

[0010] The rotary drive component is a closed-loop stepper motor positioned above the ceramic cavity. The output shaft of the closed-loop stepper motor is connected to the ceramic rotating rod via a transmission connection, which is used to control the rotation angle accuracy of the ceramic rotating rod.

[0011] The ceramic rotating rod is also equipped with a first universal ball fixedly connected to the ceramic rod body. The output shaft of the closed-loop stepper motor is fixedly connected to a ball head connector. The first universal ball is inserted into the ball head connector and fixedly connected to the ball head connector.

[0012] The linear drive is a closed-loop stepper screw motor located on the side of the ceramic cavity. The output end of the closed-loop stepper screw motor is connected to the ceramic movable rod for controlling the reciprocating distance accuracy of the ceramic movable rod.

[0013] The output shaft of the closed-loop stepper screw motor is fitted with a screw nut, and a movable block is fixedly installed on the outside of the screw nut. The movable block extends horizontally to the bottom of the ceramic cavity and has a transfer groove located below the ceramic cavity. The ceramic movable rod is provided with a second universal ball fixed to the ceramic rod body. In the assembled state, the second universal ball is placed in the transfer groove and can rotate relative to the transfer groove.

[0014] It also includes a housing, with the drive assembly and ceramic pump core assembly all installed inside the housing. A controller is fixedly installed inside the housing, and an aviation plug is fixedly installed on the outside of the housing. The controller is electrically connected to the rotary drive, the linear drive and the aviation plug respectively.

[0015] The ceramic cavity has steps on its upper and lower inner sides, and a plug seal is placed at each step.

[0016] The ceramic cavity, the ceramic rod of the ceramic rotating rod, and the ceramic rod of the ceramic movable rod are all made of zirconia ceramic or alumina ceramic.

[0017] Compared with the prior art, the embodiments of this utility model have the following beneficial effects:

[0018] (1) The outer peripheral surface of the ceramic rod of the ceramic rotating rod and the ceramic moving rod is a smooth curved surface, which can avoid scratching the sealing components during installation and use and improve the reliability of the sealing structure.

[0019] (2) Both the ceramic rotating rod and the ceramic moving rod are sealed to the ceramic cavity and are coaxially installed to form a stable self-sealing structure. This eliminates the need to rely on easily damaged parts such as O-rings and check valves, reducing potential failure points and lowering maintenance costs.

[0020] (3) The ceramic rod is inserted into the ceramic cavity and a sealed fit is achieved, which avoids direct contact between the ceramic rod and the air, prevents the fluid medium from crystallizing and adhering, solves the pump jamming problem at its root, and ensures continuous operation of the equipment.

[0021] (4) The rotary drive component drives the ceramic rotating rod to precisely switch the inlet and outlet of the liquid. The linear drive component drives the ceramic movable rod to change the volume of the cavity. The coaxial installation structure design improves the stability and accuracy of the liquid injection process.

[0022] (5) The overall structural design is simple and reasonable, and the components are closely matched. The wear during the movement is small, which helps to extend the overall service life of the equipment and is suitable for long-term continuous operation. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the injection pump in this utility model;

[0025] Figure 2 This is an exploded view of the injection pump in this utility model;

[0026] Figure 3 This is a cross-sectional view of the injection pump in this utility model;

[0027] Figure 4 This is a schematic diagram of the ceramic rotating rod in this utility model;

[0028] Figure 5 This is a schematic diagram of the ceramic cavity in this utility model. Detailed Implementation

[0029] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] The terms "first," "second," etc., in the specification, claims, and accompanying drawings of this utility model are used to distinguish different objects, not to describe a specific order. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, apparatus, product, or server that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products, or servers.

[0031] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of the present invention. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0032] This utility model discloses a specific embodiment of a precision CNC single-head ceramic linear injection pump. Please see [link to implementation details]. Figures 1 to 5 It includes a drive assembly and a ceramic pump core assembly, the ceramic pump core assembly including a ceramic cavity 5, a ceramic rotating rod 4 and a ceramic moving rod 6.

[0033] In this embodiment, the ceramic cavity 5 is provided with an inlet 51 and an outlet 52. The ceramic rotating rod 4 and the ceramic movable rod 6 are coaxially installed inside the ceramic cavity 5. Both the ceramic rotating rod 4 and the ceramic movable rod 6 are provided with ceramic rod bodies 20 that are inserted into the ceramic cavity 5 and sealed with it. The outer peripheral surface of the ceramic rod body 20 is a smooth curved surface. The sealing fit between the ceramic rod body 20 and the ceramic cavity 5 is a gap seal fit, with the size of the sealing fit gap ranging from 3 to 5 micrometers. This precision gap design can form a reliable self-sealing effect, achieving effective sealing without relying on additional sealing components. Steps 53 are formed on the upper and lower inner sides of the ceramic cavity 5. A plug seal 54 is placed at the step 53. The smooth curved surface of the ceramic rod body 20 can prevent scratching of the plug seal 54 during installation and use, significantly improving the reliability of the sealing structure, while reducing the wear of the sealing components and extending the service life of the sealing structure. The ceramic cavity 5, the ceramic rod 20 of the ceramic rotating rod 4, and the ceramic rod 20 of the ceramic movable rod 6 are all made of zirconia ceramic or alumina ceramic. These ceramic materials have excellent corrosion resistance, wear resistance and structural stability, and can meet the transportation needs of various corrosive fluids in the chemical, semiconductor and other industries, while ensuring the structural accuracy of the components during long-term high-frequency motion.

[0034] Combination Figure 4 The ceramic rod 4 has a flow channel 42 on its ceramic rod body 20. The flow channel 42 connects with the liquid inlet 51 or liquid outlet 52 of the ceramic cavity 5 as the ceramic rotating rod 4 rotates, realizing the alternating switching between the liquid inlet 51 and the liquid outlet 52. The structural design of the flow channel 42 ensures the accuracy of the liquid inlet and outlet switching and avoids the cross-flow of liquid inlet and outlet. The drive assembly includes a rotary drive 2 and a linear drive 3. The rotary drive 2 is a closed-loop stepper motor set above the ceramic cavity 5. The output shaft of the closed-loop stepper motor is connected to the ceramic rotating rod 4 for transmission and is used to control the rotation angle accuracy of the ceramic rotating rod 4. The closed-loop stepper motor has the characteristics of high control accuracy and fast response speed, which can accurately control the rotation angle of the ceramic rotating rod 4, thereby ensuring the precise docking of the flow channel 42 with the liquid inlet and outlet 52. The ceramic rotating rod 4 is also provided with a first universal ball 41 fixedly connected to the ceramic rod body 20. The output shaft of the closed-loop stepper motor is fixedly connected to a ball joint connector 21. The first universal ball 41 is placed inside the ball joint connector 21 and fixedly connected to the ball joint connector 21. The fixed connection method can ensure that the rotational torque of the closed-loop stepper motor is stably transmitted to the ceramic rotating rod 4, realizing the effective transmission of power. At the same time, the mating structure between the ball joint connector 21 and the first universal ball 41 has a floating compensation function, which can make up for the errors generated during processing and assembly, ensure the coaxiality of the ceramic rotating rod 4 and the ceramic cavity 5, and avoid jamming during movement.

[0035] Please see Figure 3The linear drive component 3 is a closed-loop stepper screw motor located on the side of the ceramic cavity 5. The output end of the closed-loop stepper screw motor is connected to the ceramic movable rod 6 for transmission and is used to control the reciprocating distance accuracy of the ceramic movable rod 6. The closed-loop stepper screw motor can accurately convert rotational motion into linear motion. By controlling the number of rotations of the motor, the moving distance of the ceramic movable rod 6 can be accurately controlled, thereby achieving precise adjustment of the cavity volume and ensuring the injection accuracy. A lead screw nut 31 is sleeved on the outer side of the output shaft of the closed-loop stepper screw motor. A movable block 32 is fixedly installed on the outer side of the lead screw nut 31. The movable block 32 extends horizontally to the bottom of the ceramic cavity 5 and has a transfer groove 34 located below the ceramic cavity 5. The ceramic movable rod 6 is provided with a second universal ball 61 fixedly connected to the ceramic rod body 20. In the assembled state, the second universal ball 61 is placed in the transfer groove 34 and can rotate relative to the transfer groove 34. This structural design can adapt to the axial movement of the ceramic movable rod 6 and allow the second universal ball 61 to rotate at a small angle, compensating for the angular deviation during the movement of the ceramic movable rod 6, avoiding lateral force between the ceramic movable rod 6 and the ceramic cavity 5, reducing wear, and ensuring the smoothness of movement.

[0036] In this embodiment, the injection pump includes a housing 1. The drive assembly and ceramic pump core assembly are both installed inside the housing 1. The housing 1 protects the internal components, preventing external dust and impurities from entering the equipment and affecting its operation, while also improving the overall structural strength of the equipment. A controller is fixedly installed inside the housing 1, and an aviation connector 11 is fixedly installed on the outside of the housing 1. The controller is electrically connected to the rotary drive 2, the linear drive 3, and the aviation connector 11. The controller can receive external control signals and precisely control the movements of the rotary drive 2 and the linear drive 3, achieving coordinated regulation of liquid inlet / outlet switching and injection volume. The aviation connector 11 provides a reliable interface for the controller to connect to external circuits, ensuring the stability of signal transmission and the safety of power supply. Furthermore, a vertical slide rail 33 is fixedly installed inside the housing 1, slidably connected to the movable block 32. The sliding cooperation between the vertical slide rail 33 and the movable block 32 further improves the injection accuracy.

[0037] The injection pump in this embodiment has a simple and reasonable overall structural design, with compact cooperation among its components. Both the ceramic rotating rod 4 and the ceramic movable rod 6 are sealed to the ceramic cavity 5 and coaxially installed, forming a stable self-sealing structure. This eliminates the need for easily damaged parts such as O-rings and check valves, reducing potential failure points and lowering maintenance costs. The ceramic rod 20 is inserted into the ceramic cavity 5 and sealed, preventing direct contact between the ceramic rod 20 and air. This prevents the fluid medium, especially the electrolyte, from crystallizing and adhering to the surface of the ceramic rod 20 after contact with air, fundamentally solving the problem of pump jamming common in traditional equipment. This ensures continuous operation and increases production capacity. The rotary drive 2 drives the ceramic rotating rod 4 to precisely switch between the inlet and outlet ports 52, while the linear drive 3 drives the ceramic movable rod 6 to change the cavity volume. Combined with the coaxial installation design and the high-precision control of the closed-loop stepper motor, this significantly improves the stability and accuracy of the injection process, meeting the requirements for precise metering and delivery. Simultaneously, the scientific design of the moving parts minimizes wear during operation, helping to extend the overall service life of the equipment and adapting to long-term continuous operation requirements.

[0038] In other embodiments, the rotary drive 2 can also be replaced by a servo motor, which can also ensure the rotation angle accuracy of the ceramic rotating rod 4 and meet the control requirements in different scenarios; the linear drive 3 can also be replaced by a linear motor, which can drive the ceramic moving rod 6 to reciprocate more quickly and improve the liquid injection efficiency; the ceramic material can also be replaced by silicon nitride ceramic, which also has excellent corrosion resistance and wear resistance and can be adapted to more special working conditions; the aviation plug 11 can also be replaced by a waterproof connector to enhance the reliability of the equipment in humid environments.

[0039] The operation of this precision CNC single-head ceramic linear injection pump is as follows: Before use, connect the controller to the external control device via aviation connector 11 to complete the circuit connection and signal interface of the equipment. Check the assembly status of each component to ensure that the ceramic rotating rod 4, ceramic moving rod 6, and ceramic cavity 5 are coaxial, the plug seal 54 is installed in place, and all connections are securely tightened. After starting the equipment, the external control device sends injection parameter signals to the controller. After receiving the signals, the controller sends control commands to the rotary drive component 2 and the linear drive component 3. The rotary drive 2 is activated, driving the ceramic rotating rod 4 to rotate around the central axis of the ceramic cavity 5, so that the guide channel 42 on the ceramic rotating rod 4 is connected to the liquid inlet 51 of the ceramic cavity 5, while simultaneously sealing the liquid outlet 52. Then, the linear drive 3 is activated, driving the ceramic movable rod 6 to reciprocate along the axial direction of the ceramic cavity 5. At this time, the ceramic movable rod 6 moves outward, increasing the internal volume of the ceramic cavity 5. Under the action of pressure difference, the fluid to be transported enters the ceramic cavity 5 through the liquid inlet 51, completing the fluid intake and loading process. After loading is completed, the controller controls the rotary drive 2 to drive the ceramic rotating rod 4 to rotate again, so that the guide channel 42 is connected to the liquid outlet 52, while simultaneously sealing the liquid inlet 51. The linear drive 3 drives the ceramic movable rod 6 to move inward, reducing the internal volume of the ceramic cavity 5. Under pressure, the fluid in the cavity is precisely output through the guide channel 42 and the liquid outlet 52, completing one injection operation. Based on actual operational needs, the controller can cyclically send control commands to make the equipment repeat the above-mentioned suction loading and liquid injection output process, achieving continuous precision liquid injection. When the equipment requires maintenance, the relevant connecting parts can be directly disassembled. With the help of the fixed connection structure between the ball joint connector 21 and the first universal ball 41, and the mating structure between the second universal ball 61 and the adapter groove 34, the ceramic pump core assembly can be quickly replaced for cleaning, inspection, or component replacement. After maintenance, it can be reassembled and put back into use.

[0040] Finally, it should be noted that the precision CNC single-head ceramic linear injection pump disclosed in this utility model embodiment is only a preferred embodiment of this utility model and is only used to illustrate the technical solution of this utility model, not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the various embodiments of this utility model.

Claims

1. A precision CNC single-head ceramic linear injection pump, characterized in that, Including drive components and ceramic pump core components; The ceramic pump core assembly includes a ceramic cavity, a ceramic rotating rod, and a ceramic movable rod. The ceramic cavity has an inlet and an outlet. The ceramic rotating rod and the ceramic movable rod are coaxially installed inside the ceramic cavity. Both the ceramic rotating rod and the ceramic movable rod have ceramic rod bodies that are inserted into the ceramic cavity and sealed with the ceramic cavity. The outer peripheral side of the ceramic rod body is a smooth curved surface. The driving assembly includes a rotary drive and a linear drive. The rotary drive is used to drive the ceramic rotating rod to rotate around the central axis of the ceramic cavity, so as to realize the alternating connection and one-way sealing of the liquid inlet and outlet on the ceramic cavity. The linear drive is used to drive the ceramic movable rod to reciprocate along the axial direction of the ceramic cavity, so as to change the internal volume of the ceramic cavity.

2. The precision CNC single-head ceramic linear injection pump according to claim 1, characterized in that, The sealing fit between the ceramic rod and the ceramic cavity is a gap sealing fit, and the size range of the sealing fit gap is 3 to 5 micrometers.

3. The precision CNC single-head ceramic linear injection pump according to claim 1, characterized in that, The ceramic rotating rod has a flow guiding channel on its ceramic rod body. The flow guiding channel is connected to the liquid inlet or liquid outlet of the ceramic cavity as the ceramic rotating rod rotates, so as to realize the alternating switching between the liquid inlet and the liquid outlet.

4. The precision CNC single-head ceramic linear injection pump according to claim 1, characterized in that, The rotary drive is a closed-loop stepper motor located above the ceramic cavity. The output shaft of the closed-loop stepper motor is connected to the ceramic rotating rod for controlling the rotation angle accuracy of the ceramic rotating rod.

5. The precision CNC single-head ceramic linear injection pump according to claim 4, characterized in that, The ceramic rotating rod is also provided with a first universal ball fixedly connected to the ceramic rod body. The output shaft of the closed-loop stepper motor is fixedly connected to a ball head connector. The first universal ball is placed inside the ball head connector and fixedly connected to the ball head connector.

6. The precision CNC single-head ceramic linear injection pump according to claim 1, characterized in that, The linear drive is a closed-loop stepper screw motor located on the side of the ceramic cavity. The output end of the closed-loop stepper screw motor is connected to the ceramic movable rod for controlling the reciprocating distance accuracy of the ceramic movable rod.

7. The precision CNC single-head ceramic linear injection pump according to claim 6, characterized in that, A lead screw nut is sleeved on the outside of the output shaft of the closed-loop stepper screw motor. A movable block is fixedly installed on the outside of the lead screw nut. The movable block extends horizontally to the bottom of the ceramic cavity, and the movable block has a transfer groove located below the ceramic cavity. The ceramic movable rod is provided with a second universal ball fixedly connected to the ceramic rod body; In the assembled state, the second universal ball is placed in the adapter groove, and the second universal ball can rotate relative to the adapter groove.

8. The precision CNC single-head ceramic linear injection pump according to claim 1, characterized in that, It also includes a housing, in which the drive assembly and the ceramic pump core assembly are both installed. A controller is fixedly installed inside the housing, and an aviation plug is fixedly installed on the outside of the housing. The controller is electrically connected to the rotary drive, the linear drive and the aviation plug respectively.

9. The precision CNC single-head ceramic linear injection pump according to claim 1, characterized in that, The upper and lower inner sides of the ceramic cavity are both stepped, and a plug seal is placed at the step.

10. The precision CNC single-head ceramic linear injection pump according to claim 1, characterized in that, The ceramic cavity, the ceramic rod of the ceramic rotating rod, and the ceramic rod of the ceramic movable rod are all made of zirconia ceramic or alumina ceramic.

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