A fluid drive mechanism for a fluid delivery device and a fluid delivery device

Abstract

The utility model relates to infusion pump technical field especially, is more particularly to a fluid drive mechanism and fluid delivery equipment for fluid delivery equipment, including lead screw, drive wheel, sleeve and screw module, screw module includes the male joint part of setting in the drive wheel hole department and the female joint part of setting in the sleeve outer surface, male joint part and female joint part are configured as the optional engagement, when male joint part and female joint part engage, the axial thrust produced by drive wheel rotation is transmitted to lead screw through sleeve, when male joint part and female joint part do not engage, drive wheel and sleeve can relatively move between. Through the transition of sleeve as between lead screw and drive wheel, can effectively avoid the waste of liquid medicine caused by the appearance of top tooth in the engagement process of lead screw and drive wheel, even if the appearance of top tooth phenomenon in the engagement process also will not push lead screw, significantly reduced the waste of liquid medicine.

Description

Technical Field

[0001] This utility model relates to the field of injection pump technology, and in particular to a fluid drive mechanism and fluid conveying equipment for fluid conveying devices. Background Technology

[0002] Fluid delivery devices have diverse applications, such as delivering liquid medications subcutaneously to patients. For example, in the case of diabetic patients, fluid infusion pumps have long been used clinically to deliver insulin. These pumps can achieve complex fluid delivery modes, covering variable basal infusion rates and booster dose requirements. Precise control of the drug delivery process helps improve therapeutic efficacy while reducing harm to patients.

[0003] Some existing infusion pumps include a reservoir containing fluid medications and use electromechanical pumping or metering technology to deliver the fluid medications via tubing to a needle and / or flexible cannula inserted subcutaneously into the patient. Some infusion pumps have been designed to be relatively small, inexpensive, lightweight, and easy to use.

[0004] These pumps also include a drive mechanism for driving fluid from a reservoir. The drive mechanism includes a plunger within the reservoir, a lead screw extending from the plunger, and a clutch mechanism engaged with the lead screw. When disengaged from the lead screw, the clutch mechanism allows the lead screw to pass through the clutch mechanism for filling the bladder. When engaged with the lead screw, the clutch mechanism allows the lead screw to rotate for incremental drug delivery. However, in practical use, it has been found that when using this method for delivery, if the clutch mechanism and lead screw fail to engage properly, at least one pitch of rotation is required to achieve full engagement. This rotational adjustment causes the lead screw to advance the plunger an equal distance within the bladder, resulting in ineffective drug delivery. For micro-infusion devices such as insulin, the wasted drug with each engagement reduces therapeutic efficacy and user experience. Therefore, there is an urgent need for a fluid delivery device with higher engagement precision to reduce drug waste caused by engagement adjustments. Utility Model Content

[0005] To address the problem of waste of medicine caused by the plunger being pushed forward during the adjustment and engagement process in existing fluid delivery equipment, this invention provides a fluid drive mechanism and fluid delivery equipment for fluid delivery devices. By using a sleeve as a transition between the guide screw and the drive wheel, the plunger can be effectively prevented from being pushed forward due to tooth impact during the engagement process. By setting the engagement mechanism between the drive wheel and the sleeve, even if tooth impact occurs during the engagement process, the guide screw will not be pushed forward, significantly reducing the waste of medicine and further improving the stability of the engagement.

[0006] This utility model provides a fluid drive mechanism for a fluid conveying device, including... The lead screw has a guide thread on its outer circumference. The drive wheel has a hole in its center. The sleeve, which has an internal thread, connects to the guide screw via the engagement of the internal thread and the guide thread. The sleeve passes through the hole in the drive wheel. The engagement module includes a male engagement portion disposed within the drive wheel bore and a female engagement portion disposed on the outer surface of the sleeve. The male and female engagement portions are configured to engage selectively. When the male and female engagement portions are engaged, the axial thrust generated by the rotation of the drive wheel is transmitted to the lead screw through the sleeve, causing the lead screw to move axially. When the male and female engagement portions are not engaged, relative motion occurs between the drive wheel and the sleeve.

[0007] The above structure effectively solves the problem of liquid waste caused by the tipping teeth in traditional fluid conveying equipment. Specifically, when the male and female joints between the drive wheel and the sleeve are not engaged, the drive wheel can not only move axially relative to the sleeve, but also drive the sleeve to rotate. However, due to the friction between the plunger and the inner wall of the fluid reservoir, the rotation of the sleeve will not drive the lead screw to rotate. Instead, the sleeve will be relatively displaced with the lead screw under the action of rotation, thus avoiding the ineffective propulsion of the plunger in the liquid bladder.

[0008] Furthermore, the male engagement portion is an axially strip-shaped inner engagement block circumferentially disposed within the drive wheel bore, and the female engagement portion is an axially strip-shaped outer engagement block circumferentially disposed on the outer surface of the sleeve. The inner and outer engagement blocks are correspondingly disposed and rotated together. The contact surfaces of the inner and outer engagement blocks are designed as bevels or arc surfaces to reduce the impact force during engagement and facilitate faster engagement. At the same time, the inner and outer engagement blocks are circumferentially corresponding to each other to ensure uniform force distribution and reliable engagement between the drive wheel and the sleeve.

[0009] Furthermore, two or more sets of inner and outer engaging blocks are provided. The inner and outer engaging blocks are arc-shaped blocks concentric with the lead screw, and the outer engaging blocks extend along the length of the sleeve. The arc-shaped design of the inner and outer engaging blocks allows them to better adapt to the rotational movement between the drive wheel and the sleeve, while ensuring a uniform distribution of force during the engagement process. The number can be adjusted according to actual needs, thereby further optimizing the engagement effect.

[0010] Furthermore, the mating surfaces of the inner and outer mating blocks are provided with mutually engaging threads, wedge-shaped teeth, or protrusions and grooves, allowing the inner and outer mating blocks to circumferentially mesh through these threads, wedge-shaped teeth, or protrusions and grooves. The design of these engagement structures can be flexibly adjusted according to specific application scenarios to meet the needs of different working conditions, thereby improving the adaptability and durability of the overall mechanism.

[0011] Furthermore, a stop is provided at the end of the inner or outer engaging block along its engagement direction, so that the engaged inner and outer engaging blocks can rotate synchronously. Due to the restriction of the stop, the drive wheel and the sleeve will not disengage under continuous rotation.

[0012] Furthermore, an inner groove is formed between adjacent inner joint blocks, and an outer groove is formed between adjacent outer joint blocks. When the outer joint block of the sleeve is in the inner groove of the drive wheel and the inner joint block of the drive wheel is in the outer groove of the sleeve, that is, the inner joint block and the outer joint block are not engaged, the sleeve can move axially relative to the drive wheel. When the inner joint block of the drive wheel is screwed into the outer joint block on the outer surface of the sleeve until it is blocked by the stop block on the inner joint block or the outer joint block, that is, the inner joint block and the outer joint block are engaged. When the drive wheel rotates, it drives the sleeve to rotate. The sleeve pushes the guide screw to move axially through the threaded engagement with the guide thread.

[0013] Furthermore, a plunger is connected to the end of the lead screw. During the pushing process, the plunger always possesses a frictional force opposite to its direction of movement. When the male and female couplings are not engaged, the axial thrust generated by the rotation of the drive wheel is transmitted to the lead screw through the sleeve. The frictional force of the plunger overcomes the axial thrust transmitted from the sleeve to the lead screw, causing the sleeve to rotate relative to the lead screw and generate relative displacement. This causes the sleeve to move axially relative to the drive wheel to achieve engagement. This prevents the lead screw from pushing the plunger forward, thus avoiding waste of medicine caused by the plunger's movement during engagement adjustment.

[0014] Furthermore, it also includes a push-off module, which is connected to the male joint and is used to apply axial thrust to the drive wheel during the engagement process, causing the drive wheel to advance axially relative to the sleeve to achieve rapid engagement. By providing axial thrust to the male joint during the engagement process through the push-off module, the male or female joint can be engaged more quickly.

[0015] Furthermore, the pushing module includes an elastic element and a pressing element. The elastic element or the pressing element is connected to the male joint. The pressing element and the elastic element are intermittently engaged, and the pressing element can contact the elastic element and generate axial thrust on it during the screwing process. During the screwing process, when the elastic element contacts the pressing element, the elastic element is compressed and deformed, thereby releasing the axial thrust and pushing the male or female joint closer to the other, facilitating faster screwing.

[0016] Furthermore, the elastic element is an arc-shaped spring sheet disposed on the male joint, with the opening direction of the arc-shaped spring sheet opposite to the screwing direction, and the pressing element is a fixed protrusion disposed on the rotation path of the arc-shaped spring sheet. The arc-shaped design of the spring sheet gives it good elastic deformation capability when compressed, thereby generating a uniform thrust when in contact with the protrusion, ensuring a stable output of axial thrust.

[0017] A fluid transport device, comprising Fluid reservoir, plunger housed within the fluid reservoir, and Fluid-driven mechanism.

[0018] Furthermore, the lead screw of the fluid drive mechanism is connected to the plunger to move the plunger within the fluid reservoir. When the male and female joints are engaged, the axial thrust generated by the rotation of the drive wheel is transmitted to the lead screw through the sleeve, causing the plunger connected to the lead screw to advance in the fluid reservoir. When the male and female joints are not engaged, the sleeve and lead screw, which are engaged by the internal thread and the guide thread, move axially within the bore of the drive wheel.

[0019] The fluid-driven mechanism is used to inject the drug solution, avoiding ineffective plunger pushing caused by the engagement and adjustment process, thereby reducing drug waste and improving the accuracy and efficiency of drug injection.

[0020] Furthermore, the system also includes a support, a fluid reservoir, and a fluid drive mechanism, all housed within the support. A mounting groove is correspondingly formed within the support. An extension section is provided on the side of the drive wheel furthest from the fluid reservoir. A pushing module is positioned between the extension section and the mounting groove. One of the elastic element and the pressing element of the pushing module is located at the end of the extension section, and the other is located on the groove wall of the mounting groove. The support provides stable support for the fluid reservoir and the drive wheel, while the pushing module is confined between the extension section and the groove wall, ensuring stable axial advancement during operation.

[0021] The beneficial effects of this utility model are as follows: This utility model provides a fluid drive mechanism and a fluid conveying device for fluid conveying equipment. Through the setting of the engagement mechanism, fluid can be smoothly injected into the fluid reservoir from the outside. Simultaneously, when it is necessary to push the liquid outward, the lead screw quickly transitions from free axial movement to precise axial drive. The fluid drive mechanism effectively solves the problem of ineffective plunger pushing caused by engagement adjustment in traditional fluid conveying processes. Rapid engagement makes the liquid injection process more precise, avoiding unnecessary waste and significantly improving injection efficiency. The axial thrust generated by the push module further assists the male and female joints in rapid engagement during the engagement process, avoiding ineffective liquid output and achieving zero liquid waste. Attached Figure Description

[0022] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Figure 1This is a schematic diagram of the assembly of the fluid drive mechanism; Figure 2 This is a disassembly diagram of the fluid drive mechanism; Figure 3 This is a schematic diagram of the fit between two sets of threads; Figure 4 This is a schematic diagram of the fit of multiple sets of threads; Figure 5 This is a schematic diagram of the engagement of two sets of wedge-shaped teeth; Figure 6 This is a first-angle schematic diagram of a fluid transport device; Figure 7 This is a second-angle schematic diagram of the fluid transport equipment; Figure 8 This is an assembly diagram of a fluid transport device (supports are hidden). Figure 9 This is a first-angle disassembly view of the fluid transport equipment (supports are hidden). Figure 10 This is a second-angle disassembly view of the fluid transport equipment (supports are hidden). Figure 11 It is an assembly diagram of an elastic element that is an arc-shaped spring sheet; Figure 12 This is a disassembly diagram of an elastic element that is an arc-shaped spring sheet; Figure 13 This is a schematic diagram of the tooth tipping phenomenon during the engagement process; In the diagram: 1. Lead screw, 2. Drive wheel, 21. Extension section, 22. Inner engagement block, 23. Inner groove, 3. Sleeve, 31. Outer engagement block, 32. Outer groove, 33. Internal thread, 4. Male engagement, 5. Female engagement, 51. Stop, 6. Elastic element, 7. Pressing element, 8. Fluid reservoir, 9. Piston, 10. Support, 11. Mounting groove, 12. Rotary sensor, 13. Spring, 14. Chamber, 15. Lead thread. Detailed Implementation

[0023] The technical solution of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of this utility model, but not all embodiments.

[0024] The existing fluid drive mechanism includes a lead screw 1 and a drive wheel 2 threaded onto the lead screw 1. Linear motion is applied to the lead screw 1 to move the plunger 9 connected to the lead screw 1 forward into the fluid reservoir 8. When liquid needs to be injected into the fluid reservoir 8, the lead screw 1 is disengaged from the drive wheel 2, allowing the lead screw 1 to pass through the drive wheel 2 to adjust the position of the plunger 9 within the fluid reservoir 8. When the liquid in the fluid reservoir 8 needs to be pushed outward, the drive wheel 2 is rotated to thread it onto the lead screw 1. However, this engagement process suffers from the problem of interlocking teeth, which can lead to ineffective advancement of the plunger 9 and waste of liquid. Figure 13 As shown, if the tooth tip fails to engage, it is necessary to rotate at least one pitch to fully engage. However, this engagement adjustment causes the plunger 9 to advance by the same distance, resulting in waste of medication in the fluid reservoir 8. For micro-infusion devices such as insulin, the wasted medication each engagement adjustment significantly affects the treatment effect and user experience.

[0025] To quickly transition the lead screw 1 from free axial movement to precise axial drive, thus reducing fluid waste, a fluid drive mechanism for fluid delivery equipment is designed to push fluid from the fluid reservoir 8 outwards, such as... Figure 1 As shown, the device includes a lead screw 1, a drive wheel 2, a sleeve 3, and a screw-on module. The lead screw 1 has a lead thread 15 on its outer periphery. The drive wheel 2 has a hole in its center and can rotate around the center of the hole. The sleeve 3 has an internal thread 33. The sleeve 3 is connected to the lead screw 1 through the cooperation of the internal thread 33 and the lead thread 15. The sleeve 3 passes through the hole of the drive wheel 2. The screw-on module includes a male engagement part 4 disposed in the hole of the drive wheel 2 and a female engagement part 5 disposed on the outer surface of the sleeve 3. The male engagement part 4 and the female engagement part 5 are configured to engage selectively. When the male joint 4 engages with the female joint 5, the axial thrust generated by the rotation of the drive wheel 2 is transmitted to the lead screw 1 through the sleeve 3, causing the lead screw 1 and the sleeve 3 to move axially synchronously. When the male joint 4 and the female joint 5 are not engaged, relative motion occurs between the drive wheel 2 and the sleeve 3. The axial thrust generated by the rotation of the drive wheel 2 is transmitted to the lead screw 1 through the sleeve 3. Because the plunger 9 at the end of the lead screw 1 is subjected to frictional force between itself and the inner wall of the fluid reservoir 8, the axial thrust cannot overcome the hydraulic pressure in the fluid reservoir 8 and the frictional force between itself and the inner wall of the reservoir 8. That is, the drive wheel 2 fails to push the lead screw 1 to move axially. The sleeve 3 rotates relative to the lead screw 1, and thus relative displacement occurs.

[0026] The lead screw 1 is connected to a plunger 9 at its end. During the pushing process, the plunger 9 maintains a frictional force opposite to its direction of movement. This frictional force is generated by the friction between the plunger 9 and the inner wall of the fluid reservoir 8. When the male engagement 4 and female engagement 5 are not engaged, the axial thrust generated by the rotation of the drive wheel 2 is transmitted to the lead screw 1 through the sleeve 3. The frictional force of the plunger 9 overcomes the axial thrust transmitted to the lead screw 1 by the sleeve 3, causing the sleeve 3 to rotate relative to the lead screw 1 and generate relative displacement. This causes the sleeve 3 to move axially relative to the drive wheel 2 to achieve engagement. The axial thrust generated by the rotation of the drive wheel 2 is transmitted to the lead screw 1 through the sleeve 3. At this time, the sleeve 3 needs to overcome the internal hydraulic pressure of the fluid reservoir 8 and the frictional force between the plunger 9 and the inner wall of the fluid reservoir 8 to drive the plunger 9 to move axially. Therefore, the sleeve 3 can only rotate relative to the lead screw 1 and retract towards the drive wheel 2 under the action of the thread, and will not push the lead screw 1 forward. By using sleeve 3 as a transition between the guide screw 1 and the drive wheel 2, the ineffective pushing of the plunger 9 caused by adjusting the top teeth during the engagement process of the guide screw 1 and the drive wheel 2 can be effectively avoided. By setting the engagement module between the drive wheel 2 and the sleeve 1, even if the top teeth phenomenon occurs during the engagement process, the drive wheel 2 will continue to rotate to adjust the engagement without pushing the guide screw 1, which significantly reduces the waste of medicine and ensures the stability of the engagement.

[0027] like Figure 2 As shown, to ensure both stable screw-in and relative axial displacement, the male joint 4 is an axially strip-shaped inner joint block 22 circumferentially disposed within the hole of the drive wheel 2, and the female joint 5 is an axially strip-shaped outer joint block 31 circumferentially disposed on the outer surface of the sleeve 3. The inner joint block 22 and the outer joint block 31 are correspondingly disposed and rotatably engaged. The cooperation between the inner joint block 22 and the outer joint block 31 ensures a stable connection during engagement, and the position between adjacent outer joint blocks 31 allows the inner joint block 22 to move axially along the sleeve 3.

[0028] To further improve engagement stability, two or more sets of inner engaging blocks 22 and outer engaging blocks 31 are provided. The inner engaging blocks 22 and outer engaging blocks 31 are arc-shaped blocks concentric with the lead screw 1, and the outer engaging blocks 31 extend along the length of the sleeve 3. By providing multiple sets of inner engaging blocks 22 and outer engaging blocks 31, the overall structural reliability is further enhanced. The arc-shaped block design not only enhances the fit during engagement but also reduces frictional resistance during rotation, making the drive wheel operation smoother. The extension of the outer engaging blocks 31 along the length of the sleeve 3 increases the engagement area, providing a larger contact range and ensuring stable power transmission under various operating conditions.

[0029] The inner engaging block 22 and the outer engaging block 31 are provided with mutually cooperating threads, wedge teeth or protrusions and grooves on their mating surfaces. The inner engaging block 22 and the outer engaging block 31 are circumferentially meshed by the threads, wedge teeth or protrusions and grooves. They can be selected according to the actual working conditions, which can effectively improve the friction and biting force between the mating surfaces. The structure is simple and easy to assemble and disassemble.

[0030] like Figure 3 As shown, two sets of inner engaging blocks 22 and outer engaging blocks 31 are provided. The engaging surfaces of inner engaging blocks 22 and outer engaging blocks 31 are provided with matching threads. A stop bar 51 is provided at the end of the outer engaging block 31 along its screwing direction to prevent excessive rotation and ensure the meshing stability of the two sets of engaging parts.

[0031] like Figure 4 As shown, multiple sets of inner engaging blocks 22 and outer engaging blocks 31 are provided. The engaging surfaces of inner engaging blocks 22 and outer engaging blocks 31 are provided with matching threads. A stop bar 51 is provided at the end of the outer engaging block 31 along its screwing direction to prevent excessive rotation and ensure the meshing stability of the two sets of engaging parts.

[0032] like Figure 5 As shown, the inner engaging block 22 and the outer engaging block 31 are provided in two sets. The engaging surfaces of the inner engaging block 22 and the outer engaging block 31 are provided with matching wedge-shaped teeth. The wedge-shaped teeth facilitate faster engagement. The head end of the wedge-shaped teeth along its rotation direction has a smaller thickness to avoid tooth tipping and facilitate engagement. The end has a larger thickness to improve engagement stability.

[0033] like Figure 3 and 4 As shown, in order to prevent the drive wheel 2 from loosening after driving the sleeve 3 to rotate continuously, the inner connecting block 22 and the outer connecting block 31 are provided with a stop block 51 at the end along their screwing direction. The inner connecting block 22 of the drive wheel 2 is screwed into the outer connecting block 31 on the outer surface of the sleeve 3 until it abuts against the end stop block 51, that is, screwed into place. After the inner connecting block 22 and the outer connecting block 31 are engaged, they can maintain synchronous rotation.

[0034] An inner groove 23 is formed between adjacent inner connecting blocks 22, and an outer groove 32 is formed between adjacent outer connecting blocks 31. When the outer connecting block 31 of the sleeve 3 is in the inner groove 23 of the drive wheel 2 and the inner connecting block 22 of the drive wheel 2 is in the outer groove 32 of the sleeve 3, that is, the inner connecting block 22 and the outer connecting block 31 are not engaged, the drive wheel 2 can move axially relative to the sleeve 3. When the inner connecting block 22 of the drive wheel 2 is screwed to the outer connecting block 31 on the outer surface of the sleeve 3 until it is blocked by the stop block 51 on the inner connecting block 22 or the outer connecting block 31, that is, the inner connecting block 22 and the outer connecting block 31 are engaged. When the drive wheel 2 rotates, it drives the sleeve 3 to rotate. The sleeve 3 pushes the guide screw 1 to move axially through the thread engagement with the guide thread 15.

[0035] like Figure 6 and 7 As shown, in order to assist the drive wheel 2 and the sleeve 3 to engage faster, a push-off module is also included. The push-off module is connected to the male joint 4 and is used to apply an axial thrust to the drive wheel 2 during the engagement process, so that it is axially advanced relative to the sleeve 3 to achieve rapid engagement.

[0036] The push-off module includes an elastic element 6 and a pressing element 7. The elastic element 6 or the pressing element 7 is connected to the male engagement part 4. The pressing element 7 intermittently engages with the elastic element 6, contacting it during engagement and generating axial thrust. The elastic element 6 provides stable axial thrust and exhibits good resilience. The pressing element 7 can adjust its contact angle and position with the elastic element 6 according to actual needs, thereby optimizing the axial thrust transmission efficiency. During engagement, when the male engagement part 4 or the female engagement part 5 rotates to a specific position, the pressing element 7 contacts the elastic element 6. The elastic element 6 is compressed and generates a reaction force, pushing the male engagement part 4 or the female engagement part 5 axially, achieving rapid engagement. This not only simplifies the structure but also significantly improves the reliability and accuracy of engagement.

[0037] like Figure 11 and 12 As shown, preferably, the elastic element 6 is an arc-shaped spring sheet disposed on the male joint 4, the opening direction of the arc-shaped spring sheet being opposite to the screwing direction, and the pressing element 7 is a fixed protrusion disposed on the rotation path of the arc-shaped spring sheet. The arc-shaped spring sheet is made of a highly elastic material, and its thickness and the angle of its protrusion are adjustable to ensure that it can provide a uniform and controllable axial thrust when subjected to force. During the screwing process of the male joint 4 or the female joint 5, the fixed protrusion gradually approaches the arc-shaped spring sheet and begins to apply pressure. This gradual contact method can effectively reduce the impact force and avoid structural damage caused by excessive instantaneous thrust.

[0038] like Figures 8-10 As shown, a fluid conveying device includes a fluid reservoir 8, a plunger 9, and a fluid drive mechanism. The plunger 9 is housed in the fluid reservoir 8. A lead screw 1 of the fluid drive mechanism is connected to the plunger 9 to move the plunger 9 within the fluid reservoir 8. When the male engagement 4 engages with the female engagement 5, the axial thrust generated by the rotation of the drive wheel 2 is transmitted to the lead screw 1 through the sleeve 3, causing the plunger 9 connected to the lead screw 1 to advance within the fluid reservoir 8. When the male engagement 4 and the female engagement 5 are not engaged, the sleeve 3 and the lead screw 1, which are engaged by the internal thread 33 and the guide thread 15, move axially within the bore of the drive wheel 2.

[0039] The linear motion generated by the lead screw 1 is transmitted to the plunger 9 within the fluid reservoir 8, enabling precise and controlled distribution of fluid within the reservoir 8. During the filling process of the fluid reservoir 8, the sleeve 3 remains disengaged from the drive wheel 2, allowing the plunger 9 to move freely to any position depending on the volume being filled. Upon completion of filling, the drive wheel 2 engages with the sleeve 3, enabling the device to dispense fluid from the fluid reservoir 8. This fluid delivery method is described in detail in patent publication CN101208515A and will not be repeated here.

[0040] like Figure 6 and 7 As shown, in order to integrate the fluid storage device 8 and the fluid drive mechanism, a support 10 is also included. The fluid storage device 8 and the fluid drive mechanism are both disposed in the support 10. A mounting groove 11 is provided in the support 10. An extension section 21 is provided on the side of the drive wheel 2 away from the fluid storage device 8. The push module is restricted between the extension section 21 and the mounting groove 11.

[0041] To monitor the number of rotations of the drive wheel 2, a rotation sensor 12 is installed on the extension section 21. The rotation sensor 12 includes a conductive code disk mounted on the extension section 21. When the drive wheel 2 rotates, it drives the conductive code disk to rotate. The conductive code disk generates a change in electrical signal through its rotational motion, thus proving that the drive wheel 2 is rotating. To meet the requirements of miniaturization design, an arc-shaped spring or an arc-shaped variable diameter block is formed on the conductive code disk. The arc-shaped spring or the arc-shaped variable diameter block shares a common center with the conductive code disk. Integrating the arc-shaped spring or the arc-shaped variable diameter block into the conductive code disk not only reduces the number of parts, but also effectively reduces the complexity of the overall structure, optimizes space utilization, and improves the overall compactness of the equipment, providing greater possibilities for the miniaturization and lightweighting of fluid conveying equipment.

[0042] The above description is illustrative only and not restrictive of this utility model. Those skilled in the art will understand that many modifications, variations or equivalents can be made without departing from the spirit and scope defined by the appended claims, and all such modifications, variations or equivalents will fall within the protection scope of this utility model.

Claims

1. A fluid drive mechanism for a fluid conveying device, characterized in that: include The lead screw (1) has a lead thread (15) on its outer periphery. The drive wheel (2) has a hole at its center and can rotate around the center of the hole. A sleeve (3) is provided with an internal thread (33). The sleeve (3) is connected to the guide screw (1) through the cooperation of the internal thread (33) and the guide thread (15). The sleeve (3) passes through the hole of the drive wheel (2) and... The engagement module includes a male engagement portion (4) disposed within a hole in the drive wheel (2) and a female engagement portion (5) disposed on the outer surface of the sleeve (3), the male engagement portion (4) and the female engagement portion (5) being configured to selectively engage. When the male joint (4) engages with the female joint (5), the axial thrust generated by the rotation of the drive wheel (2) is transmitted to the lead screw (1) through the sleeve (3), causing the lead screw (1) to move axially. When the male joint (4) and the female joint (5) are not engaged, relative motion occurs between the drive wheel (2) and the sleeve (3).

2. The fluid drive mechanism for a fluid conveying device according to claim 1, characterized in that: The male joint (4) is an axial strip-shaped inner joint block (22) circumferentially disposed in the hole of the drive wheel (2), and the female joint (5) is an axial strip-shaped outer joint block (31) circumferentially disposed on the outer surface of the sleeve (3). The inner joint block (22) and the outer joint block (31) are correspondingly disposed and rotated together.

3. A fluid drive mechanism for a fluid conveying device according to claim 2, characterized in that: The inner connecting block (22) and the outer connecting block (31) are provided in two or more sets respectively. The inner connecting block (22) and the outer connecting block (31) are arc-shaped blocks concentric with the lead screw (1). The outer connecting block (31) extends along the length direction of the sleeve (3).

4. A fluid drive mechanism for a fluid conveying device according to claim 3, characterized in that: The inner connecting block (22) and the outer connecting block (31) are provided with mutually cooperating threads, wedge teeth or protrusions and grooves on their mating surfaces. The inner connecting block (22) and the outer connecting block (31) are circumferentially meshed by the threads, wedge teeth or protrusions and grooves.

5. A fluid drive mechanism for a fluid conveying device according to claim 4, characterized in that: The inner connecting block (22) or the outer connecting block (31) is provided with a stop block (51) at the end of its screwing direction, so that the inner connecting block (22) and the outer connecting block (31) can rotate synchronously after being connected.

6. A fluid drive mechanism for a fluid conveying device according to claim 5, characterized in that: An inner groove (23) is formed between adjacent inner joint blocks (22), and an outer groove (32) is formed between adjacent outer joint blocks (31). When the outer engaging block (31) of the sleeve (3) is in the inner groove (23) of the drive wheel (2) and the inner engaging block (22) of the drive wheel (2) is in the outer groove (32) of the sleeve (3), that is, the inner engaging block (22) and the outer engaging block (31) are not engaged, the drive wheel (2) can move axially relative to the sleeve (3). When the inner engaging block (22) of the drive wheel (2) and the outer engaging block (31) on the outer surface of the sleeve (3) are screwed together and blocked by the stop block (51) on the inner engaging block (22) or the outer engaging block (31), that is, the inner engaging block (22) and the outer engaging block (31) are engaged. When the drive wheel (2) rotates, it drives the sleeve (3) to rotate. The sleeve (3) pushes the guide screw (1) to move axially by engaging with the guide thread (15).

7. A fluid drive mechanism for a fluid conveying device according to claim 1, characterized in that: The end of the lead screw (1) is connected to a plunger (9). During the pushing process, the plunger (9) always has a frictional force opposite to the direction of movement of the plunger (9). When the male joint (4) and the female joint (5) are not engaged, the axial thrust generated by the rotation of the drive wheel (2) is transmitted to the lead screw (1) through the sleeve (3). The frictional force of the plunger (9) overcomes the axial thrust transmitted to the lead screw (1) by the sleeve (3), causing the sleeve (3) to rotate relative to the lead screw (1) and generate relative displacement, so that the sleeve (3) moves axially relative to the drive wheel (2) to achieve engagement.

8. A fluid drive mechanism for a fluid conveying device according to claim 1, characterized in that: It also includes a push-off module, which is connected to the male joint (4) and is used to apply an axial thrust to the drive wheel (2) during the engagement process, so that the drive wheel (2) is axially advanced relative to the sleeve (3) to achieve rapid engagement.

9. A fluid drive mechanism for a fluid conveying device according to claim 8, characterized in that: The push-off module includes an elastic element (6) and a pressing element (7). The elastic element (6) or the pressing element (7) is disposed on the male joint (4). The pressing element (7) is intermittently engaged with the elastic element (6) and can contact the elastic element (6) during the screwing process and generate axial thrust on it.

10. A fluid drive mechanism for a fluid conveying device according to claim 9, characterized in that: The elastic element (6) is an arc-shaped spring sheet provided on the male joint (4). The opening direction of the arc-shaped spring sheet is opposite to the screwing direction. The pressing element (7) is a fixed protrusion provided on the rotation path of the arc-shaped spring sheet.

11. A fluid conveying device, characterized in that: include Fluid reservoir (8), wherein the plunger (9) is housed in the fluid reservoir (8), and The fluid drive mechanism according to any one of claims 1-10.

12. A fluid conveying device according to claim 11, characterized in that: The lead screw (1) is connected to the plunger (9) to move the plunger (9) in the fluid reservoir (8). When the male joint (4) engages with the female joint (5), the axial thrust generated by the rotation of the drive wheel (2) is transmitted to the lead screw (1) through the sleeve (3), causing the plunger (9) connected to the lead screw (1) to advance in the fluid reservoir (8). When the male joint (4) and the female joint (5) are not engaged, the sleeve (3) and the lead screw (1) which are engaged by the internal thread (33) and the guide thread (15) move axially in the hole of the drive wheel (2).

13. A fluid conveying device according to claim 12, characterized in that: It also includes a support (10), the fluid reservoir (8) and the fluid drive mechanism are both located in the support (10), and a corresponding mounting groove (11) is provided in the support (10). An extension section (21) is provided on the side of the drive wheel (2) away from the fluid reservoir (8). The pushing module is located between the extension section (21) and the mounting groove (11). One of the elastic element (6) and the pressing element (7) of the pushing module is located at the end of the extension section (21), and the other is located on the groove wall of the mounting groove (11).

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