An auxiliary screwing mechanism for a fluid delivery device and a fluid delivery device

Abstract

The utility model relates to infusion pump technical field especially is involved in a kind of auxiliary screwing mechanism and fluid conveying equipment for fluid conveying equipment, including screwing module and push module, screwing module includes male joint part and female joint part that can be mutually screwed, push module is set on screwing module, for applying axial thrust to male joint part or female joint part in screwing process, make it relative other party axial advance to realize quick screwing, push module includes elastic member and pressure piece, one of elastic member and pressure piece is set on screwing module, and other intermittent cooperation therebetween.This auxiliary screwing mechanism and fluid conveying equipment are set in the screwing process of screwing module by the setting of push module for male joint part or female joint part relative other party's axial thrust, so that male joint part or female joint part can be screwed faster, avoid the invalid push of plunger caused by the adjustment of traditional screwing mechanism to screw, to reduce the waste of liquid medicine.

Description

Technical Field

[0001] This utility model relates to the field of infusion pump technology, and in particular to an auxiliary coupling mechanism for fluid delivery equipment and a fluid delivery equipment. 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 infusion. However, in practical use, it has been found that when using this infusion method, if the clutch mechanism fails to engage or fully engage with the lead screw, at least one pitch of rotation is required to achieve full engagement. This rotational adjustment causes the plunger to advance an equal distance, resulting in wasted drug in the bladder. For micro-infusion devices such as insulin, the wasted drug with each engagement reduces therapeutic efficacy and impacts 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 conveying equipment, this invention provides an auxiliary engagement mechanism for fluid conveying equipment. By applying axial thrust through a push module during the engagement process, the female and male engagement parts can be quickly engaged, thereby avoiding waste of medicine caused by ineffective plunger pushing during engagement adjustment.

[0006] This utility model provides an auxiliary coupling mechanism for fluid transport equipment, including... The engagement module includes male and female couplings that can be screwed together. The push-off module, mounted on the engagement module, applies an axial thrust to the male or female joint during the engagement process, propelling it axially relative to the other for rapid engagement. By applying this push-off module to the male or female joint during engagement, the engagement can be achieved more quickly.

[0007] Furthermore, the pushing module includes an elastic element and a pressing element. One of the elastic element and the pressing element is disposed at the end of the screw-in module, and the other is intermittently engaged with it to contact each other and generate axial thrust during the screw-in process. During the screw-in process, when the elastic element contacts the pressing element, the elastic element is compressed and deformed, thereby generating axial thrust, pushing the male or female joint closer to the other, facilitating faster screw-in between the two.

[0008] Furthermore, the elastic element is an arc-shaped spring sheet disposed on the screw-in module, with the opening direction of the arc-shaped spring sheet opposite to the screw-in 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 under pressure, thereby generating a uniform thrust when in contact with the protrusion, ensuring a stable output of axial thrust.

[0009] Furthermore, the pressing component is an arc-shaped variable-diameter block disposed on the screw-in module, and the elastic component is an elastic protrusion disposed on the rotation path of the arc-shaped variable-diameter block. The height of the arc-shaped variable-diameter block gradually increases along the screw-in direction, so that it can form a progressive contact with the elastic protrusion during the screw-in process, improving the smoothness of the contact and ensuring the stable output of axial thrust.

[0010] A fluid transport device, comprising Fluid storage device The plunger is located in the fluid reservoir. A lead screw, with a guide thread on its outer circumference, connects to a plunger to move the plunger within the fluid reservoir. 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. Auxiliary engagement mechanism.

[0011] 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.

[0012] Furthermore, the female connector is an outer connector provided on the outer surface of the sleeve, and the male connector adapted to it is an inner connector provided in the drive wheel hole. When the male and female couplings disengage, the sleeve is allowed to move axially through the drive wheel with the lead screw. When the male and female couplings engage, the drive wheel is allowed to rotate the sleeve, causing the sleeve to push the lead screw to move axially. The plunger connected to the lead screw also generates axial movement in the fluid reservoir.

[0013] Furthermore, the inner joint is an axial strip-shaped inner joint block disposed within the drive wheel bore, and the outer joint is an axial strip-shaped outer joint block disposed on the outer surface of the sleeve. The inner and outer joint blocks are correspondingly arranged and rotatably engaged. The contact surfaces of the inner and outer joint 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 joint blocks are circumferentially corresponding to each other to ensure uniform force distribution and reliable engagement between the drive wheel and the sleeve.

[0014] 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.

[0015] 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.

[0016] Furthermore, a stop is provided at the end of the inner or outer joint block along its screwing direction, so that the inner and outer joint blocks can rotate synchronously after being joined. During the process of the inner joint block screwing into the outer joint block, it is screwed into place when it abuts against the end stop, so that the drive wheel and the sleeve will not disengage under continuous rotation.

[0017] 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 drive wheel can move axially relative to the sleeve. When the inner joint block of the drive wheel is screwed to 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 of the internal thread and the guide thread.

[0018] Furthermore, the elastic or pressing element of the push module is provided on the drive wheel to push the drive wheel toward the fluid reservoir side, so that the drive wheel and the sleeve can be quickly engaged by the action of the male and female couplings.

[0019] Furthermore, the system also includes a support, a fluid reservoir, and an auxiliary engagement 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.

[0020] The beneficial effects of this utility model are as follows: This invention provides an auxiliary screwing mechanism for fluid conveying equipment and the fluid conveying equipment itself. The screwing mechanism allows for smooth injection of fluid into the fluid reservoir from the outside. Simultaneously, when it is necessary to push the liquid outward, it quickly converts the lead screw 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 screwing 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 faster engagement during the screwing process, avoiding ineffective liquid output and achieving zero liquid waste. Attached Figure Description

[0021] 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 an assembly diagram of the auxiliary engagement mechanism; Figure 2 This is a disassembly diagram of the auxiliary engagement 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 It is an assembly diagram where the elastic element is an elastic protrusion; Figure 14 This is a disassembly diagram of the elastic protrusion at the first angle of the elastic component; Figure 15 This is a second-angle disassembly diagram of the elastic element, which is an elastic protrusion; Figure 16 This is a schematic diagram of the tooth tipping phenomenon during the engagement process; In the diagram: 100. Engagement module, 200. Pushing module, 1. Male engagement component, 2. Female engagement component, 3. Elastic component, 4. Pressing component, 5. Fluid reservoir, 6. Piston, 7. Lead screw, 71. Lead thread, 8. Drive wheel, 81. Inner engagement block, 82. Inner groove, 9. Sleeve, 91. Outer engagement block, 92. Outer groove, 93. Internal thread, 10. Stop, 11. Support, 12. Mounting groove, 13. Extension section, 14. Rotation sensor. Detailed Implementation

[0022] 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.

[0023] The existing fluid drive mechanism includes a lead screw 7 and a drive wheel 8 threaded onto the lead screw 7. Linear motion is applied to the lead screw 7 to move the plunger 6 connected to the lead screw 7 forward into the fluid reservoir 5. When liquid needs to be injected into the reservoir, the lead screw 7 is disengaged from the drive wheel 8, allowing the lead screw 7 to pass through the drive wheel 8 to adjust the position of the plunger 6 within the fluid reservoir 5. When the liquid needs to be pushed out of the reservoir, the drive wheel 8 is rotated to thread it onto the lead screw 7. However, this engagement process has a problem of mutual tooth contact, which can lead to ineffective advancement of the plunger 6 and waste of liquid. Figure 16 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 6 to advance by the same distance, resulting in waste of medication in the fluid reservoir 5. For micro-infusion devices such as insulin, the wasted medication each engagement adjustment significantly affects the treatment effect and user experience.

[0024] To quickly transition the lead screw 7 from free axial movement to precise axial drive, thus reducing liquid waste, an auxiliary engagement mechanism for fluid delivery equipment is designed, such as... Figure 1 and 2 As shown, it includes a screw-in module 100 and a push-off module 200. The screw-in module 100 includes a male connector 1 and a female connector 2 that can be screwed into each other. The push-off module 200 is disposed on the screw-in module 100 and is used to apply an axial thrust to the male connector 1 or the female connector 2 during the screw-in process, so that it is axially advanced relative to the other to achieve rapid screw-in.

[0025] The push-off module 200 includes an elastic element 3 and a pressing element 4. One of the elastic element 3 and the pressing element 4 is disposed on the engagement module 100, and the other is intermittently engaged with it to contact each other and generate axial thrust during engagement. The elastic element 3 can provide stable axial thrust and has good resilience. The pressing element 4 can adjust its contact angle and position with the elastic element 3 according to actual needs, thereby optimizing the thrust transmission efficiency. During engagement, when the male engagement part 1 or the female engagement part 2 rotates to a specific position, the pressing element 4 contacts the elastic element 3. The elastic element 3 is compressed and generates a reaction force, pushing the male engagement part 1 or the female engagement part 2 to move axially relative to the other, thereby achieving rapid engagement. This not only simplifies the structure but also significantly improves the reliability and accuracy of engagement.

[0026] like Figure 11 and 12As shown, preferably, the elastic element 3 is an arc-shaped spring sheet disposed on the screw-in module 100, the opening direction of the arc-shaped spring sheet is opposite to the screw-in direction, and the pressing element 4 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 the thickness and the angle of the arc-shaped spring sheet are adjustable to ensure that a uniform and controllable axial thrust can be provided when subjected to force. During the screw-in 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.

[0027] like Figures 13-15 As shown, optionally, the pressing member 4 is an arc-shaped variable diameter block disposed on the screw-in module 100, and the elastic member 3 is an elastic protrusion disposed on the rotation path of the arc-shaped variable diameter block. The mounting groove 11 has a groove on its wall that can accommodate the elastic protrusion. The elastic protrusion is disposed in the groove by a spring. When the arc-shaped variable diameter block and the elastic protrusion first come into contact, the height is at its lowest. As the screwing proceeds, the height of the arc-shaped variable diameter block gradually increases, thereby achieving smooth and continuous axial thrust transmission with good stability.

[0028] like Figures 8-10 As shown, a fluid conveying device includes a fluid reservoir 5, a plunger 6, a lead screw 7, a drive wheel 8, a sleeve 9, and the aforementioned auxiliary engagement mechanism. The plunger 6 is disposed in the fluid reservoir 5. The lead screw 7 has a guide thread 71 on its outer periphery and is connected to the plunger 6 to move the plunger 6 in the fluid reservoir 5. The drive wheel 8 has a hole in its center. The sleeve 9 has an internal thread 93 and is connected to the lead screw 7 through the engagement of the internal thread 93 and the guide thread 71. The sleeve 9 passes through the hole in the drive wheel 8.

[0029] An elastic element 3 or a pressing element 4 is provided at the shaft end of the drive wheel 8 to push the drive wheel 8 toward the fluid reservoir 5, so that the drive wheel 8 and the sleeve 9 can be quickly engaged by the action of the male coupling 1 and the female coupling 2. The female coupling 2 is an outer engagement part provided on the outer surface of the sleeve 9, and the male coupling 1 adapted to it is an inner engagement part provided in the hole of the drive wheel 8; when the male coupling 1 and the female coupling 2 are disengaged, the sleeve 9 is allowed to move axially through the drive wheel 8 with the guide screw 7. When the male coupling 1 and the female coupling 2 are engaged, the drive wheel 8 is allowed to drive the sleeve 9 to rotate, so that the sleeve 9 pushes the guide screw 7 to move axially, and the plunger 6 connected to the guide screw 7 also generates axial movement in the fluid reservoir 5.

[0030] The linear motion generated by the lead screw 7 is transmitted to the plunger 6 within the fluid reservoir 5, enabling precise and controlled distribution of fluid within the reservoir 5. During the filling process of the fluid reservoir 5, the sleeve 9 remains disengaged from the drive wheel 8, allowing the plunger 6 to move freely to any position depending on the volume being filled. Upon completion of filling, the drive wheel 8 engages with the sleeve 9, enabling the device to dispense fluid from the fluid reservoir 5. This fluid delivery method is described in detail in patent publication CN101208515A and will not be repeated here.

[0031] like Figures 1-5 As shown, to ensure both stable screw-in and relative axial displacement, the inner joint is an axial strip-shaped inner joint block 81 disposed within the hole of the drive wheel 8, and the outer joint is an axial strip-shaped outer joint block 91 disposed on the outer surface of the sleeve 9. The inner joint block 81 and the outer joint block 91 are correspondingly disposed and rotatably engaged. The cooperation between the inner joint block 81 and the outer joint block 91 ensures a stable connection during engagement, and the position between adjacent outer joint blocks 91 allows the inner joint block 22 to move axially along the sleeve 9.

[0032] To further improve engagement stability, two or more sets of inner engagement blocks 81 and outer engagement blocks 91 are provided. The inner engagement blocks 81 and outer engagement blocks 91 are arc-shaped blocks concentric with the guide screw 7, and the outer engagement block 91 extends along the length of the sleeve 9. By providing multiple sets of inner engagement blocks 81 and outer engagement blocks 91, 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 engagement block 91 along the length of the sleeve 9 increases the engagement area, providing a larger contact range and ensuring stable power transmission under various operating conditions.

[0033] The inner engaging block 81 and the outer engaging block 91 have mating surfaces with mutually engaging threads, wedge teeth, or protrusions and grooves. The inner engaging block 81 and the outer engaging block 91 are circumferentially meshed through the threads, wedge teeth, or protrusions and grooves. They can be selected according to actual working conditions, which can effectively improve the friction and interlocking force between the mating surfaces, and the structure is simple, making it easy to assemble and disassemble.

[0034] like Figure 3 and 4 As shown, in order to prevent the drive wheel 8 from disengaging after driving the sleeve 9 to rotate continuously, a stop block 10 is provided at the end of the inner engagement block 81 or the outer engagement block 91 along its screwing direction. The inner engagement block 81 of the drive wheel 8 is screwed into the outer engagement block 91 on the outer surface of the sleeve 9 until it abuts against the end stop block 10, that is, screwed into place. After engagement, the inner engagement block 81 and the outer engagement block 91 can maintain synchronous rotation.

[0035] like Figure 3 As shown, two sets of inner engaging blocks 81 and outer engaging blocks 91 are provided. The engaging surfaces of inner engaging blocks 81 and outer engaging blocks 91 are provided with matching threads. A stop bar 10 is provided at the end of the outer engaging block 91 along its screwing direction to prevent excessive rotation and ensure the meshing stability of the two sets of engaging parts.

[0036] like Figure 4 As shown, multiple sets of inner engaging blocks 81 and outer engaging blocks 91 are provided. The engaging surfaces of inner engaging blocks 81 and outer engaging blocks 91 are provided with matching threads. A stop bar 10 is provided at the end of the outer engaging block 91 along its screwing direction to prevent excessive rotation and ensure the meshing stability of the two sets of engaging parts.

[0037] like Figure 5 As shown, the inner engaging block 81 and the outer engaging block 91 are provided with two sets of corresponding components. The engaging surfaces of the inner engaging block 81 and the outer engaging block 91 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.

[0038] Specifically, an inner groove 82 is formed between adjacent inner connecting blocks 81, and an outer groove 92 is formed between adjacent outer connecting blocks 91. When the outer connecting block 91 of the sleeve 9 is in the inner groove 82 of the drive wheel 8 and the inner connecting block 81 of the drive wheel 8 is in the outer groove 92 of the sleeve 9, that is, the inner connecting block 81 and the outer connecting block 91 are not engaged, the drive wheel 8 can move axially relative to the sleeve 9 to ensure that the liquid medicine is smoothly injected into the fluid storage tank 8. When the inner connecting block 81 of the drive wheel 8 is screwed to the outer connecting block 91 on the outer surface of the sleeve 9 and blocked by the stop block 10 on the inner connecting block 81 or the outer connecting block 91, that is, the inner connecting block 81 and the outer connecting block 91 are engaged, the drive wheel 8 rotates and drives the sleeve 9 to rotate. The sleeve 9 pushes the guide screw 7 to move axially through the thread engagement with the inner thread 93 and the guide thread 71 to complete the outward injection of the liquid medicine.

[0039] like Figure 6 and 7 As shown, in order to integrate the fluid reservoir 5 and the auxiliary coupling mechanism, a support 11 is also included. The fluid reservoir 5 and the auxiliary coupling mechanism are both disposed in the support 11. A mounting groove 12 is correspondingly provided in the support 11. An extension section 13 is provided on the side of the drive wheel 8 away from the fluid reservoir 5. A push module 200 is disposed between the extension section 13 and the mounting groove 12. One of the elastic member 3 and the pressing member 4 of the push module 200 is disposed at the end of the extension section 13, and the other is disposed on the groove wall of the mounting groove 12.

[0040] To monitor the number of rotations of the drive wheel 8, a rotation sensor 14 is installed on the extension section 13. The rotation sensor 14 includes a conductive code disk mounted on the extension section 13. When the drive wheel 8 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 8 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 weight reduction of fluid conveying equipment.

[0041] 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. An auxiliary engagement mechanism for a fluid transport device, characterized in that: include A screw-in module (100), the screw-in module (100) comprising a male coupling (1) and a female coupling (2) that can be screwed into each other, and Push-off module (200), which is disposed on the engagement module (100), is used to apply axial thrust to the male engagement member (1) or female engagement member (2) during the engagement process, so that it is axially advanced relative to the other party to achieve rapid engagement.

2. The auxiliary engagement mechanism for a fluid transport device according to claim 1, characterized in that: The pushing module (200) includes an elastic element (3) and a pressing element (4). One of the elastic element (3) and the pressing element (4) is disposed on the screwing module (100), and the other is intermittently engaged with it to contact each other and generate axial thrust during the screwing process.

3. The auxiliary engagement mechanism for a fluid transport device according to claim 2, characterized in that: The elastic element (3) is an arc-shaped spring sheet disposed on the screw-in module (100). The opening direction of the arc-shaped spring sheet is opposite to the screw-in direction. The pressing element (4) is a fixed protrusion disposed on the rotation path of the arc-shaped spring sheet.

4. The auxiliary engagement mechanism for a fluid transport device according to claim 2, characterized in that: The pressing member (4) is an arc-shaped variable diameter block provided on the screw-in module (100), and the elastic member (3) is an elastic protrusion provided on the rotation path of the arc-shaped variable diameter block.

5. A fluid conveying device, characterized in that: include Fluid storage device (5). A plunger (6) is disposed in a fluid reservoir (5). A lead screw (7) is provided with a lead thread (71) on its outer periphery. The lead screw (7) is connected to a plunger (6) to move the plunger (6) in the fluid reservoir (5). The drive wheel (8) has a hole at its center. A sleeve (9) is provided with an internal thread (93). The sleeve (9) is connected to the guide screw (7) through the engagement of the internal thread (93) and the guide thread (71). The sleeve (9) passes through the hole of the drive wheel (8) and... The auxiliary engagement mechanism according to any one of claims 1-4.

6. A fluid conveying device according to claim 5, characterized in that: The female connector (2) is an outer connector provided on the outer surface of the sleeve (9), and the male connector (1) adapted thereto is an inner connector provided in the hole of the drive wheel (8); When the male connector (1) and the female connector (2) disengage, the sleeve (9) is allowed to move axially through the drive wheel (8) with the lead screw (7). When the male connector (1) and the female connector (2) engage, the drive wheel (8) is allowed to drive the sleeve (9) to rotate, so that the sleeve (9) pushes the lead screw (7) to move axially. Then the plunger (6) connected to the lead screw (7) also generates axial movement in the fluid reservoir (5).

7. A fluid conveying device according to claim 6, characterized in that: The inner joint is an axial strip-shaped inner joint block (81) disposed in the hole of the drive wheel (8), and the outer joint is an axial strip-shaped outer joint block (91) disposed on the outer surface of the sleeve (9). The inner joint block (81) and the outer joint block (91) are correspondingly disposed and can be rotatably joined.

8. A fluid conveying device according to claim 7, characterized in that: The inner connecting block (81) and the outer connecting block (91) are provided in two or more sets. The inner connecting block (81) and the outer connecting block (91) are arc-shaped blocks concentric with the lead screw (7). The outer connecting block (91) extends along the length direction of the sleeve (9).

9. A fluid conveying device according to claim 8, characterized in that: The inner connecting block (81) and the outer connecting block (91) are provided with mutually cooperating threads, wedge teeth or protrusions and grooves on their mating surfaces. The inner connecting block (81) and the outer connecting block (91) are circumferentially meshed by the threads, wedge teeth or protrusions and grooves.

10. A fluid conveying device according to claim 9, characterized in that: The inner connecting block (81) or the outer connecting block (91) is provided with a stop block (10) at the end of its screwing direction, so that the inner connecting block (81) and the outer connecting block (91) can rotate synchronously after being connected.

11. A fluid conveying device according to claim 10, characterized in that: An inner groove (82) is formed between adjacent inner joint blocks (81), and an outer groove (92) is formed between adjacent outer joint blocks (91). When the outer engaging block (91) of the sleeve (9) is in the inner groove (82) of the drive wheel (8) and the inner engaging block (81) of the drive wheel (8) is in the outer groove (92) of the sleeve (9), that is, the inner engaging block (81) and the outer engaging block (91) are not engaged, the drive wheel (8) can move axially relative to the sleeve (9). When the inner engaging block (81) of the drive wheel (8) and the outer engaging block (91) on the outer surface of the sleeve (9) are screwed together and blocked by the stop block (10) on the inner engaging block (81) or the outer engaging block (91), that is, the inner engaging block (81) and the outer engaging block (91) are engaged. When the drive wheel (8) rotates, it drives the sleeve (9) to rotate. The sleeve (9) pushes the guide screw (7) to move axially through the thread engagement of the inner thread (93) and the guide thread (71).

12. A fluid conveying device according to claim 6, characterized in that: The elastic element (3) or pressing element (4) of the pushing module (200) is provided on the drive wheel (8) to push the drive wheel (8) toward the fluid reservoir (5) so that the drive wheel (8) and the sleeve (9) are quickly engaged by the action of the male coupling (1) and the female coupling (2).

13. A fluid conveying device according to claim 12, characterized in that: It also includes a support (11), the fluid reservoir (5) and the auxiliary screwing mechanism are both located in the support (11), and a corresponding mounting groove (12) is provided in the support (11). An extension section (13) is provided on the side of the drive wheel (8) away from the fluid reservoir (5). The push module (200) is located between the extension section (13) and the mounting groove (12). One of the elastic element (3) and the pressing element (4) of the push module (200) is located at the end of the extension section (13), and the other is located on the groove wall of the mounting groove (12).

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