A pumping system

Abstract

The present invention relates to the technical field of medical devices and discloses a pumping system, which includes: a housing having a connection hole opened at the front end; a pump body, the rear end of which is rotatably fitted into the connection hole, and a piston cavity is defined at the rear end of the pump body; a push rod slidably received inside the housing, and the front end of the push rod passes through the piston cavity; a piston received in the piston cavity and located at the front end of the push rod, and the piston can move axially along the piston cavity relative to the pump body; wherein, a limiting structure is provided between the piston and the pump body, and the limiting structure can prevent the piston from rotating relative to the pump body. The beneficial effects of the present invention are: By connecting the pump body and the housing in a screwing-in manner, it is not only convenient to install but also can improve the fixing performance between the pump body and the housing, reduce the operating noise of the system. In addition, the piston cannot rotate during operation, which can reduce the wear of the piston during operation.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and particularly to a pumping system. Background Art

[0002] In existing medical device products, a medical pumping system is usually connected to a doctor operating device and is a disposable medical device. The structure of the pumping system needs to be very simple, and the installation and disassembly are very convenient. At the same time, it needs to have high reliability and firmness.

[0003] In the prior art, a push rod is arranged inside a housing, a piston is connected to the front end of the push rod, and a piston cavity is formed in a pump body; during installation, the rear end of the body is inserted into the front end of the housing, and then clamped through a clamping structure. At this time, the piston is received in the piston cavity of the pump body; the prior art mainly has the following disadvantages: First, the fixing performance of the pump body is poor, and the pump body vibrates in the housing during operation, generating relatively large noise; second, when the system is operating, while the push rod drives the piston to linearly slide along the piston cavity, due to vibration, the piston will rotate relative to the pump body, resulting in relatively large wear and damage to the piston. Summary of the Invention

[0004] The object of the present invention is to overcome the deficiencies of the prior art and provide a pumping system that can improve the fixing performance between the pump body and the housing and reduce the wear of the piston during operation.

[0005] To achieve the above object, the present invention provides a pumping system, which includes:

[0006] A housing having a connection hole formed at the front end;

[0007] A pump body, the rear end of which is screwed into the connection hole in a mating manner, and the rear end of the pump body defines a piston cavity;

[0008] A push rod, slidably received inside the housing, and the front end of the push rod passes through the piston cavity;

[0009] A piston, received in the piston cavity and located at the front end of the push rod, and the piston can move axially along the piston cavity relative to the pump body;

[0010] Wherein, a limiting structure is provided between the piston and the pump body, and the limiting structure can prevent the piston from rotating relative to the pump body.

[0011] As a preferred solution, the limiting structure includes a first chute defined at the rear end of the pump body and a guiding portion provided on the outer peripheral wall of the piston. The first chute extends along the axial direction of the piston cavity, and the guiding portion is slidably disposed in the first chute.

[0012] As a preferred solution, the front end of the push rod has a first engaging position, and the piston is provided with a second engaging position;

[0013] When the first slide groove receives the guide portion and the pump body is rotated so that the pump body is screwed into the connecting hole, the pump body drives the piston to rotate, thereby causing the first engaging position to engage with the second engaging position.

[0014] As a preferred solution, the first engaging position is at least one engaging block defined on the outer peripheral wall of the front end of the push rod;

[0015] The rear end of the piston is provided with a first receiving groove, the front end of the push rod is arranged in the first receiving groove, and the second clamping position is defined as at least one limiting groove on the inner peripheral wall of the first receiving groove corresponding to each of the clamping blocks.

[0016] As a preferred solution, a plurality of blocks are circumferentially spaced apart on the outer circumferential wall of the front end of the push rod, and a plurality of limiting grooves corresponding to the blocks are provided on the inner circumferential wall of the first accommodating groove.

[0017] As a preferred embodiment, the piston includes: a piston body, a sealing portion connected to the front end of the piston body, and a connecting body connected to the rear end of the piston body. The piston is elastically deformed and received in the piston cavity by the sealing portion, and the first accommodating groove is opened on the connecting body.

[0018] As a preferred embodiment, the connecting body includes a front section, a transition section and a rear section connected in sequence from front to rear, the front section and the rear section are both annular, the front section is connected to the piston body, the transition section includes a plurality of spaced-apart connecting rods, one end of the connecting rod is connected to the front section, and the other end of the connecting rod is connected to the rear section, the inner side surface of the connecting rod has a stopper, and each of the stoppers and the rear end surface of the piston body is defined as the limiting groove.

[0019] As a preferred solution, an internal thread is provided in the connecting hole, and a connecting portion meshing with the internal thread is provided on the outer peripheral wall of the pump body.

[0020] As a preferred solution, at least two connecting parts are circumferentially arranged on the outer peripheral wall of the pump body.

[0021] A spiral protrusion is provided on the inner wall of the front end of the shell, and the protrusion extends along the axial direction of the piston cavity and defines a spiral screw-in groove. The protrusion and the screw-in groove constitute the internal thread, and at least two installation grooves corresponding to each of the connecting parts and connected to the screw-in grooves are opened on the rear side surface of the protrusion.

[0022] As a preferred solution, the internal thread is a trapezoidal thread, a round thread, a serrated thread or a square thread.

[0023] As a preferred solution, a positioning seat is circumferentially defined along the inner side wall of the housing. A rotating seat is also slidably arranged in the housing. The rotating seat is located at the front end of the positioning seat. The rear end of the pump body abuts against the rotating seat, and an elastic sheet is arranged between the rotating seat and the positioning seat.

[0024] As a preferred solution, the pumping system further includes a driving mechanism arranged in the housing. The driving mechanism can drive the push rod to move linearly back and forth along the piston cavity.

[0025] As a preferred solution, the driving mechanism includes a transmission shaft and a turntable sleeved outside the transmission shaft. The transmission shaft is eccentrically arranged relative to the turntable. A second receiving groove for receiving the turntable is formed on the push rod. The front and rear sides of the turntable respectively abut against the front and rear side walls of the second receiving groove. A second sliding groove extending along the axial direction of the piston cavity is formed on the push rod. The transmission shaft passes through the second sliding groove and is rotatably connected to the housing.

[0026] As a preferred solution, bearings are sleeved on both sides of the push rod where it is located. The bearings are installed in the housing.

[0027] Compared with the prior art, the pumping system according to an embodiment of the present invention has the following beneficial effects:

[0028] In the pumping system according to the embodiment of the present invention, the pump body and the housing are connected by screwing, which is convenient for installation, and the axial positioning is accurate. Due to the extrusion friction force between them, it has a high self-locking property, which can ensure the firmness of the pumping system during operation and reduce noise. In addition, in the pumping system of this embodiment, a limiting structure for preventing the piston from rotating relative to the pump body is provided between the piston and the pump body, which can avoid free rotation during the axial movement of the piston and can greatly reduce the wear performance of the piston. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 is a schematic structural diagram of a pumping system according to an embodiment of the present invention;

[0030] Figure 2 is an exploded structural diagram of a pumping system according to an embodiment of the present invention;

[0031] Figure 3 is a schematic cross-sectional view of a pumping system according to an embodiment of the present invention in the transverse direction;

[0032] Figure 4 is Figure 3 a partially enlarged schematic view of the position where the pump body is connected to the housing in

[0033] Figure 5 is a longitudinal cross-sectional schematic diagram of a pumping system in an embodiment of the present invention;

[0034] Figure 6 is a schematic structural diagram of a piston of a pumping system in an embodiment of the present invention;

[0035] Figure 7 is a partial enlarged schematic diagram of the front end of a push rod of a pumping system in an embodiment of the present invention;

[0036] Figure 8 is a schematic structural diagram of a housing of a pumping system in an embodiment of the present invention;

[0037] Figure 9 It is a state diagram of a pumping system in an embodiment of the present invention where a pump body and a casing are connected.

[0038] In the figure, 1, shell; 11, internal thread; 111, raised portion; 1111, mounting groove; 112, screw-in groove; 12, positioning seat; 13, connecting hole; 2, push rod; 21, block; 22, second accommodating groove; 23, second slide groove; 3, pump body; 31, connecting portion; 32, piston chamber; 33, first slide groove; 4, piston; 41, guide portion; 42, first accommodating groove; 421, limiting groove; 43, piston body; 44, sealing portion; 45, connecting body; 451, front section; 452, transition section; 4521, connecting rod; 4521b, stopper; 453, rear section; 5, rotating seat; 6, elastic sheet; 7, transmission shaft; 8, turntable; 9, bearing. DETAILED DESCRIPTION

[0039] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0040] In the description of the present invention, it should be understood that the present invention uses the terms "first", "second", etc. to describe various information, but these information should not be limited to these terms, and these terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of the present invention, the "first" information may also be referred to as the "second" information, and similarly, the "second" information may also be referred to as the "first" information.

[0041] In addition, it should be noted that, in this embodiment, when the pumping system is connected to the doctor's operating device, the end close to the doctor's operating device is the "front" and the end away from the doctor's operating device is the "rear".

[0042] like Figures 1-9As shown in the figure, a pumping system according to a preferred embodiment of the present invention includes a housing 1, a pump body 3, a push rod 2, and a piston 4. A connection hole 13 is provided at the front end of the housing 1, and the rear end of the pump body 3 is screwed into the connection hole 13. The push rod 2 is slidably received inside the housing 1. A piston chamber 32 is defined at the rear end of the pump body 3. The front end of the push rod 2 passes through the piston chamber 32. The piston 4 is received in the piston chamber 32 and is located at the front end of the push rod 2. The piston 4 can move axially along the piston chamber 32 relative to the pump body 3. Among them, a limiting structure is provided between the piston 4 and the pump body 3, and the limiting structure can prevent the piston 4 from rotating relative to the pump body 3.

[0043] Based on the above technical solution, in the pumping system of this embodiment, during the installation process, by connecting the pump body 3 and the housing 1 by screwing, not only is the connection convenient, but also the axial positioning is accurate. And due to the squeezing friction force between them, it has a high self-locking characteristic, preventing the pump body 3 and the housing 1 from separating during the operation of the pumping system due to vibration. In addition, in this embodiment, since a limiting structure for restricting the relative rotation of the piston 4 relative to the pump body 3 is provided, it can prevent the piston 4 from rotating relative to the pump body 3, avoiding free rotation during the axial movement of the piston 4, and can greatly reduce the wear performance of the piston 4.

[0044] Specifically, the limiting structure in this embodiment includes a first chute 33 defined at the rear end of the pump body 3 and a guiding portion 41 provided on the outer peripheral wall of the piston 4. The first chute 33 extends along the axial direction of the piston chamber 32, and the guiding portion 41 is slidably disposed in the first chute 33. Before inserting the pump body 3, the first chute 33 is aligned with the guiding portion 41. During the process of screwing in the pump body 3, the pump body 3 drives the piston 4 to rotate. During the operation of the system, the push rod 2 drives the piston 4 to move linearly back and forth in the piston chamber 32. At this time, the piston 4 slides in the first chute 33. Due to the limiting effect of the first chute 33 on the piston 4, it can prevent the piston 4 from rotating in the piston chamber 32 during the operation of the system, and can reduce the wear of the piston 4 during operation.

[0045] In the prior art, the connection between the piston and the push rod is usually achieved through the elastic deformation of the piston claw. Due to the high movement frequency and large power transmission of the piston, higher requirements are put forward for the wear resistance, creep resistance and strength of the piston, and at the same time, high requirements are also put forward for the processing technology of the piston. To address this defect, further, in this embodiment, a first clamping position is provided at the front end of the push rod 2, and a second clamping position is provided on the piston 4; during the installation process, when the first chute 33 is aligned with the guiding portion 41 and the pump body 3 is rotated to screw the pump body 3 into the connection hole 13, the pump body 3 drives the piston 4 to rotate, so that the first clamping position is clamped with the second clamping position, thereby quickly installing the piston 4 at the front end of the push rod 2 when connecting the pump body 3 and the housing 1.

[0046] Specifically, in this embodiment, as Figure 7 shown, the first clamping position is a plurality of blocks 21 defined on the outer peripheral wall of the front end of the push rod 2 and circumferentially spaced apart; as Figure 6 shown, a first receiving groove 42 is formed on the rear end face of the piston 4, the front end of the push rod 2 is disposed in the first receiving groove 42, the piston 4 can rotate relative to the push rod 2, and the second clamping position is a plurality of limiting grooves 421 defined on the inner peripheral wall of the first receiving groove 42 and corresponding to each of the blocks 21 one by one. When the pump body 3 is inserted into the housing 1 and the pump body 3 is rotated, the pump body 3 drives the piston 4 to rotate. When the pump body 3 is screwed tightly to the front end of the housing 1, the pump body 3 drives the piston 4 to rotate to a position where each block 21 is clamped in a limiting groove 421. At this time, the piston 4 is fixed to the front end of the push rod 2, and quick installation can be achieved.

[0047] Continue to refer to the attached Figure 6 shown, in this embodiment, the piston 4 includes: a piston body 43, a sealing portion 44 connected to the front end of the piston body 43, and a connecting body 45 connected to the rear end of the piston body 43. The piston 4 is received in the piston cavity 32 through the elastic deformation of the sealing portion 44, and the first receiving groove 42 is formed on the connecting body 45. Among them, the piston body 43 is a rigid body, such as a metal part, and both the sealing portion 44 and the connecting body 45 are elastic parts, and are connected to the piston body 43 by injection molding, interference fit or welding, etc. The sealing portion 44 is in sealing contact with the piston cavity 32, and the connecting body 45 is used to be fixedly connected to the push rod 2 and is slidably connected to the pump body 3.

[0048] Further, the connector 45 in this embodiment includes a front section 451, a transition section 452, and a rear section 453 that are connected in sequence from front to back. Both the front section 451 and the rear section 453 are annular. The front section 451 is connected to the piston body 43. The transition section 452 includes a plurality of connecting rods 4521 distributed at intervals. One end of the connecting rod 4521 is connected to the front section 451, and the other end of the connecting rod 4521 is connected to the rear section 453. The inner side surface of the connecting rod 4521 has a stop block 4521b. Each of the stop blocks 4521b and the rear end surface of the piston body 43 define the limiting groove 421. When the piston 4 is rotated so that each of the locking blocks 21 of the push rod 2 is correspondingly clamped in each of the limiting grooves 421, the piston 4 can be fixed to the front end of the push rod 2. On the contrary, if the piston 4 needs to be disassembled from the push rod 2, it can be rotated to a position where each of the locking blocks 21 is between two adjacent connecting rods 4521.

[0049] Further, in this embodiment, an internal thread 11 is provided in the connection hole 13, and a connection portion 31 meshing with the internal thread 11 is provided on the outer peripheral wall of the pump body 3. The pump body 3 and the housing 1 are screwed together, which can further improve the self-locking performance and prevent the pump body 3 from disengaging from the housing 1 due to vibration during system operation.

[0050] In order to flexibly screw the pump body 3 into the internal thread 11 of the housing 1, in this embodiment, at least two connection portions 31 are circumferentially provided on the outer peripheral wall of the pump body 3; correspondingly, as Figure 8 shown, a spiral protrusion 111 is provided on the inner side wall of the front end of the housing 1. The protrusion 111 extends along the axial direction of the piston chamber 32 and defines a spiral insertion groove 112. The protrusion 111 and the insertion groove 112 constitute the internal thread 11. At least two installation grooves 1111 corresponding to each connection portion 31 and communicating with the insertion groove 112 are provided on the rear side surface of the protrusion 111. One of the installation grooves 1111 is defined at the rear end of the protrusion 111.

[0051] Specifically, when the pump body 3 includes two connection portions 31, two installation grooves 1111 are provided on the protrusion 111 of the housing 1, as specifically shown in Figure 8 ; when inserting the pump body 3, two of the connection portions 31 are respectively aligned with the corresponding installation grooves 1111, so as to insert the connection portion 31 into the insertion groove 112, as specifically shown in Figure 9 in state one. At this time, when the pump body 3 is rotated clockwise by 60° along the insertion groove 112, as shown in Figure 9 in state two of the attachment, at this time, the pump body 3 and the housing 1 are clamped tightly by the thread.

[0052] In this embodiment, the internal thread 11 on the housing 1 is preferably a trapezoidal thread, a round thread, a serrated thread, or a square thread; the thread forms include metric threads, American threads, British threads, etc.; this can further ensure tightness and can be flexibly screwed into the pump body 3.

[0053] As an alternative to the above technical solution, in this embodiment, a screwing groove in an irregular progressive form can also be provided in the connecting hole 13.

[0054] In order to ensure that the pump body 3 and the housing 1 remain reliably connected during the operation of the pumping system, a positioning seat 12 is circumferentially defined along the inner side wall of the housing 1. A rotating seat 5 is also slidably provided in the housing 1. The rotating seat 5 is located at the front end of the positioning seat 12. The rear end of the pump body 3 abuts against the rotating seat 5, and an elastic sheet 6 is provided between the rotating seat 5 and the positioning seat 12. The elastic sheet 6 can provide a pre-tightening force between the housing 1 and the pump body 3, thereby effectively preventing the pump body 3 from falling off the housing 1 when vibration occurs during the operation of the system.

[0055] More specifically, in this embodiment, a driving mechanism is further provided in the housing 1. The power output end of the driving mechanism is connected to the push rod 2. The driving mechanism can drive the push rod 2 to move linearly back and forth along the piston chamber 32, thereby pressurizing the medium in the piston chamber 32.

[0056] Further, the driving mechanism in this embodiment includes a transmission shaft 7 and a turntable 8 sleeved outside the transmission shaft 7. The transmission shaft 7 is eccentrically arranged relative to the turntable 8. A second receiving groove 22 for receiving the turntable 8 is provided on the push rod 2. The front and rear sides of the turntable 8 respectively abut against the front and rear side walls of the second receiving groove 22. A second sliding groove 23 extending along the axial direction of the piston chamber 32 is provided on the push rod 2. The transmission shaft 7 passes through the second sliding groove 23 and is rotatably connected to the housing 1; since the transmission shaft 7 is eccentrically arranged relative to the turntable 8, when the transmission shaft 7 rotates to drive the turntable 8 to rotate, it can push the push rod 2 to move linearly back and forth.

[0057] Exemplarily, as Figure 5 shown, the lower end of the transmission shaft 7 passes through the housing 1, and the end of the transmission shaft 7 protruding outside the housing 1 is used to be connected to the power output end of the motor.

[0058] In this embodiment, bearings 9 are sleeved on both sides of the push rod 2 where the turntable 8 is located. The bearings 9 are installed in the housing 1. The bearings 9 play a supporting role for the push rod 2. Since bearings 9 are provided at both the front and rear ends of the push rod 2, the bending moment effect during the rotation of the turntable 8 can be reduced, and the straightness during the movement of the push rod 2 can be ensured.

[0059] In summary, the embodiment of the present invention provides a pumping system. The pump body of the pumping system is connected to the housing by a screwing-in method, with accurate axial positioning and high self-locking characteristics, which can ensure the firmness of the pumping system during operation and reduce noise. In addition, in the pumping system of this embodiment, a limiting structure for preventing the relative rotation of the sewing piston with respect to the pump body is provided between the piston and the pump body, which can avoid free rotation during the axial movement of the piston and greatly reduce the wear performance of the piston.

[0060] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and replacements can be made, and these improvements and replacements should also be regarded as the protection scope of the present invention.

Claims

1. A pumping system, characterized in that, include: The shell has a connection hole at the front end; A pump body, the rear end of which is screwed into the connecting hole, and the rear end of the pump body defines a piston cavity; A push rod is slidably received in the housing, and a front end of the push rod is inserted into the piston cavity; A piston, received in the piston cavity and located at the front end of the push rod, the piston being able to move axially along the piston cavity relative to the pump body; Wherein, a limiting structure is provided between the piston and the pump body, and the limiting structure can prevent the piston from rotating relative to the pump body; A positioning seat is defined along the circumference of the inner side wall of the shell, and a rotating seat is slidably provided in the shell. The rotating seat is located at the front end of the positioning seat, the rear end of the pump body abuts against the rotating seat, and an elastic sheet is provided between the rotating seat and the positioning seat; The pumping system further comprises a driving mechanism disposed in the housing, the driving mechanism being capable of driving the push rod to move linearly back and forth along the piston chamber; The limiting structure includes a first slide groove defined at the rear end of the pump body and a guide portion provided on the outer peripheral wall of the piston, the first slide groove extends along the axial direction of the piston cavity, and the guide portion is slidably provided in the first slide groove; The front end of the push rod has a first clamping position, and the piston is provided with a second clamping position; When the first slide groove receives the guide portion and the pump body is rotated so that the pump body is screwed into the connecting hole, the pump body drives the piston to rotate, thereby causing the first engaging position to engage with the second engaging position; The first engaging position is at least one engaging block defined on the outer peripheral wall of the front end of the push rod; The rear end of the piston is provided with a first receiving groove, the front end of the push rod is arranged in the first receiving groove, and the second clamping position is defined as at least one limiting groove on the inner peripheral wall of the first receiving groove corresponding to each of the clamping blocks.

2. The pumping system according to claim 1, characterized in that, A plurality of clamping blocks are circumferentially spaced apart on the outer circumferential wall of the front end of the push rod, and a plurality of limiting grooves corresponding to the clamping blocks are arranged on the inner circumferential wall of the first accommodating groove.

3. The pumping system according to claim 2, wherein, The piston comprises: a piston body, a sealing portion connected to the front end of the piston body and a connecting body connected to the rear end of the piston body. The piston is elastically deformed and received in the piston cavity by the sealing portion, and the first receiving groove is provided on the connecting body.

4. The pumping system according to claim 3, characterized in that, The connecting body includes a front section, a transition section and a rear section which are connected in sequence from front to rear, the front section and the rear section are both annular, the front section is connected to the piston body, the transition section includes a plurality of spaced-apart connecting rods, one end of the connecting rod is connected to the front section, the other end of the connecting rod is connected to the rear section, the inner side surface of the connecting rod is provided with a stopper, and the limit groove is defined between each stopper and the rear end surface of the piston body.

5. The pumping system according to claim 1, characterized in that, An internal thread is provided in the connection hole, and a connection portion meshing with the internal thread is provided on the outer peripheral wall of the pump body.

6. The pumping system according to claim 5, wherein, At least two connecting parts are circumferentially arranged on the outer peripheral wall of the pump body. On the inner side wall at the front end of the housing, there is a spiral raised portion. The raised portion extends along the axial direction of the piston chamber and defines a spiral screw-in groove. The raised portion and the screw-in groove constitute the internal thread. On the rear side surface of the raised portion, there are at least two mounting grooves that correspond to each of the connecting portions one by one and communicate with the screw-in groove.

7. The pumping system according to claim 5, wherein, The internal thread is a trapezoidal thread, a round thread, a serrated thread or a square thread.

8. The pumping system according to claim 1, characterized in that, The driving mechanism includes a transmission shaft and a turntable sleeved outside the transmission shaft. The transmission shaft is eccentrically arranged relative to the turntable. A second receiving groove for receiving the turntable is provided on the push rod. The front and rear sides of the turntable are respectively abutted against the front and rear side walls of the second receiving groove. A second sliding groove extending along the axial direction of the piston chamber is provided on the push rod. The transmission shaft passes through the second sliding groove and is rotationally connected to the housing.

9. The pumping system according to claim 8, wherein, Bearings are sleeved on both sides of the push rod where the turntable is located, and the bearings are installed in the housing.

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