CN211397785U

CN211397785U - Pumping system

Info

Publication number: CN211397785U
Application number: CN201922154465.3U
Authority: CN
Inventors: 吴衍
Original assignee: Huizhou Haizhuo Kesai Medical Co ltd
Current assignee: Huizhou Haizhuo Kesai Medical Co ltd
Priority date: 2019-12-04
Filing date: 2019-12-04
Publication date: 2020-09-01
Anticipated expiration: 2029-12-04
Also published as: WO2021109087A1

Abstract

The utility model relates to the technical field of medical equipment, a pumping system is disclosed, it includes: the front end of the shell is provided with a connecting hole; the rear end of the pump body is screwed into the connecting hole in a matching manner, and a piston cavity is defined at the rear end of the pump body; the push rod is slidingly received in the shell, and the front end of the push rod penetrates through the piston cavity; a piston received in the piston cavity at a forward end of the push rod, the piston being movable relative to the pump body along an axial direction of the piston cavity; the piston is arranged on the pump body, the pump body is provided with a limiting structure, and the limiting structure can prevent the piston from rotating relative to the pump body. The utility model has the advantages that: the pump body and the shell are connected in a screwing mode, so that the installation is convenient, the fixing performance between the pump body and the shell can be improved, the running noise of a system is reduced, in addition, the piston cannot rotate in the running process, and the abrasion of the piston in the running process can be reduced.

Description

Pumping system

Technical Field

The utility model relates to the technical field of medical equipment, especially, relate to a pumping system.

Background

In the existing medical device products, the medical pumping system is usually connected with the doctor operating device, and for the disposable medical device, the structure of the pumping system needs to be very simple, the installation and the disassembly are very simple and convenient, and meanwhile, the reliability and the firmness need to be very high.

In the prior art, a push rod is arranged in a shell, the front end of the push rod is connected with a piston, and a piston cavity is arranged in a pump body; during installation, the rear end of the body is inserted into the front end of the shell and clamped tightly through the clamping structure, and the piston is received in a piston cavity of the pump body; the prior art mainly has the following defects: firstly, the pump body has poor fixity, the pump body vibrates in the shell during operation, and the generated noise is large; secondly, when the system is in operation, the push rod drives the piston to slide linearly along the piston cavity, and simultaneously, the piston can rotate relative to the pump body due to vibration, so that the piston is greatly damaged by abrasion.

SUMMERY OF THE UTILITY MODEL

The utility model aims at: the pumping system overcomes the defects of the prior art, can improve the fixing performance between the pump body and the shell, and reduces the abrasion of the piston in the operation process.

In order to achieve the above object, the present invention provides a pumping system, comprising:

the front end of the shell is provided with a connecting hole;

the rear end of the pump body is screwed into the connecting hole in a matching manner, and a piston cavity is defined at the rear end of the pump body;

the push rod is slidingly received in the shell, and the front end of the push rod penetrates through the piston cavity;

a piston received in the piston cavity at a forward end of the push rod, the piston being movable relative to the pump body along an axial direction of the piston cavity;

the piston is arranged on the pump body, the pump body is provided with a limiting structure, and the limiting structure can prevent the piston from rotating relative to the pump body.

Preferably, the limiting structure includes a first sliding groove defined at the rear end of the pump body and a guide portion disposed on the outer peripheral wall of the piston, the first sliding groove extends along the axial direction of the piston cavity, and the guide portion is slidably disposed in the first sliding groove.

As a preferred scheme, the front end of the push rod is provided with a first clamping position, and the piston is provided with a second clamping position;

when the first sliding groove receives the guide part, the pump body is rotated to enable the pump body to be screwed into the connecting hole, the pump body drives the piston to rotate, and then the first clamping position and the second clamping position are clamped.

Preferably, the first clamping position is at least one clamping block limited on the peripheral wall of the front end of the push rod;

the rear end of the piston is provided with a first accommodating groove, the front end of the push rod is arranged in the first accommodating groove, and the second clamping position is at least one limiting groove which is limited on the inner peripheral wall of the first accommodating groove and corresponds to the clamping blocks one to one.

According to a preferable scheme, a plurality of clamping blocks are circumferentially distributed on the outer peripheral wall of the front end of the push rod at intervals, and a plurality of limiting grooves corresponding to the clamping blocks one to one are formed in the inner peripheral wall of the first accommodating groove.

Preferably, the piston includes: the piston comprises a piston body, a sealing part 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 accommodated in the piston cavity through elastic deformation of the sealing part, and the first accommodating groove is formed in the connecting body.

Preferably, the connecting body includes a front section, a transition section and a rear section which are sequentially connected from front to back, the front section and the rear section are all annular, the front section is connected with the piston body, the transition section includes a plurality of connecting rods which are distributed at intervals, one end of each connecting rod is connected with the front section, the other end of each connecting rod is connected with the rear section, a stop block is arranged on the inner side surface of each connecting rod, and the limit groove is defined between each stop block and the rear end surface of the piston body.

Preferably, an internal thread is formed in the connecting hole, and a connecting portion meshed with the internal thread is arranged on the outer peripheral wall of the pump body.

Preferably, the peripheral wall of the pump body is circumferentially provided with at least two connecting parts,

be equipped with spiral helicine bellying on the inside wall of casing front end, the bellying extends and is injectd spiral helicine groove of spiraling along the axial in piston chamber, the bellying reaches the groove of spiraling constitutes the internal thread, seted up at least two and each on the trailing flank of bellying connecting portion one-to-one and intercommunication the mounting groove of spiraling groove.

Preferably, the internal thread is a trapezoidal thread, a round thread, a zigzag thread or a square thread.

As a preferred scheme, a positioning seat is circumferentially limited along the inner side wall of the shell, a rotating seat is further slidably arranged in the shell and located at the front end of the positioning seat, the rear end of the pump body is abutted against the rotating seat, and an elastic sheet is arranged between the rotating seat and the positioning seat.

Preferably, the pumping system further comprises a driving mechanism arranged in the shell, and the driving mechanism can drive the push rod to linearly reciprocate along the piston cavity.

As a preferred scheme, the driving mechanism includes a transmission shaft and a turntable sleeved outside the transmission shaft, the transmission shaft is eccentrically arranged with respect to the turntable, a second accommodating groove for accommodating the turntable is formed in the push rod, the front and rear sides of the turntable are respectively abutted to the front and rear side walls of the second accommodating groove, a second sliding groove extending along the axial direction of the piston cavity is formed in the push rod, and the transmission shaft penetrates through the second sliding groove and is rotatably connected with the housing.

Preferably, the push rod is arranged on two sides of the turntable and is sleeved with bearings, and the bearings are arranged in the shell.

The embodiment of the utility model provides a pumping system compares with prior art, and its beneficial effect lies in:

the pumping system provided by the embodiment of the utility model has the advantages that the pump body and the shell are connected in a screwing mode, the installation is convenient, the axial positioning is accurate, and the pumping system has high self-locking characteristic due to the mutual extrusion friction force, the firmness of the pumping system in the operation process can be ensured, and the noise is reduced; in addition, in the pumping system in the embodiment, the limiting structure for preventing the piston from rotating relative to the pump body is arranged between the piston and the pump body, so that the free rotation is avoided in the axial movement process of the piston, and the abrasion performance of the piston can be greatly reduced.

Drawings

Fig. 1 is a schematic structural diagram of a pumping system according to an embodiment of the present invention;

fig. 2 is an exploded view of a pumping system in an embodiment of the invention;

fig. 3 is a schematic diagram of a lateral cross-section of a pumping system in an embodiment of the present invention;

FIG. 4 is an enlarged fragmentary view of FIG. 3 about the location where the pump body is connected to the housing;

fig. 5 is a schematic longitudinal sectional view of a pumping system in an embodiment of the invention;

fig. 6 is a schematic structural diagram of a piston of a pumping system according to an embodiment of the present invention;

fig. 7 is an enlarged, partial schematic view of the front end of a push rod of a pumping system in an embodiment of the present invention;

fig. 8 is a schematic structural view of a housing of a pumping system in an embodiment of the present invention;

fig. 9 is a state diagram of the pump body and the housing of the pumping system according to the embodiment of the present invention.

In the figure, 1, a housing; 11. an internal thread; 111. a boss portion; 1111. mounting grooves; 112. screwing into the groove; 12. positioning seats; 13. connecting holes; 2. a push rod; 21. a clamping block; 22. a second accommodating groove; 23. a second chute; 3. a pump body; 31. a connecting portion; 32. a piston cavity; 33. a first chute; 4. a piston; 41. a guide portion; 42. a first accommodating groove; 421. a limiting groove; 43. a piston body; 44. a sealing part; 45. a linker; 451. a front section; 452. a transition section; 4521. a connecting rod; 4521b, stop block; 453. a rear section; 5. a rotating base; 6. an elastic sheet; 7. a drive shaft; 8. a turntable; 9. and a bearing.

Detailed Description

The following detailed description of the embodiments of the present invention is provided with reference to the accompanying drawings and examples. The following examples are intended to illustrate the invention, but are not intended to limit the scope of the invention.

In the description of the present invention, it should be understood that the terms "first", "second", and the like are used in the present invention to describe various information, but the 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, "first" information may also be referred to as "second" information, and similarly, "second" information may also be referred to as "first" information, without departing from the scope of the present invention.

In addition, in this embodiment, when the pumping system is connected to the operating device, the end close to the operating device is "front" and the end away from the operating device is "rear".

As shown in fig. 1-9, 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 connecting hole 13 is formed in the front end of the shell 1, the rear end of the pump body 3 is screwed into the connecting hole 13 in a matching manner, the push rod 2 is received in the shell 1 in a sliding manner, a piston cavity 32 is defined in the rear end of the pump body 3, the front end of the push rod 2 is arranged in the piston cavity 32 in a penetrating manner, the piston 4 is received in the piston cavity 32 and is positioned at the front end of the push rod 2, and the piston 4 can move along the axial direction of the piston cavity 32 relative to the pump body 3; and a limiting structure is arranged 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.

Based on the technical scheme, in the pumping system in the embodiment, in the installation process, the pump body 3 is connected with the shell 1 in a screwing mode, so that the pumping system is convenient to connect and accurate in axial positioning, has a high self-locking characteristic due to the mutual extrusion friction force, and prevents the pump body 3 from being separated from the shell 1 due to the vibration in the operation process of the pumping system; in addition, in the embodiment, because the limiting structure for limiting the relative rotation of the piston 4 relative to the pump body 3 is arranged, the piston 4 can be prevented from rotating relative to the pump body 3, the free rotation is avoided in the axial movement process of the piston 4, and the abrasion performance of the piston 4 can be greatly reduced.

Specifically, the limiting structure in this embodiment includes a first sliding groove 33 defined at the rear end of the pump body 3, and a guide portion 41 provided on the outer peripheral wall of the piston 4, the first sliding groove 33 extends in the axial direction of the piston cavity 32, and the guide portion 41 is slidably provided in the first sliding groove 33; before the pump body 3 is inserted, the first sliding groove 33 is aligned with the guide part 41, and the pump body 3 drives the piston 4 to rotate in the process of screwing in the pump body 3; in the operation process of the system, the push rod 2 drives the piston 4 to linearly reciprocate in the piston cavity 32, at the moment, the piston 4 slides in the first sliding groove 33, and due to the limiting effect of the first sliding groove 33 on the piston 4, the piston 4 can be prevented from rotating in the piston cavity 32 in the operation process of the system, and the abrasion of the piston 4 in the operation process can be reduced.

In the prior art, the piston and the push rod are connected through elastic deformation of piston jaws, and the piston has high motion frequency and high power transmission, so that high requirements on the wear resistance, creep resistance, strength and the like of the piston are provided, and high requirements on the machining process of the piston are provided. For the defect, in this embodiment, a first clamping position is disposed at the front end of the push rod 2, and a second clamping position is disposed on the piston 4; in the installation, when first spout 33 aims at guide part 41, rotate the pump body 3 makes the screw in of the pump body 3 during connecting hole 13, the pump body 3 drives piston 4 rotates, and then makes first joint position with second joint position joint to make when connecting the pump body 3 and casing 1, install piston 4 in the front end of push rod 2 fast.

Specifically, in this embodiment, as shown in fig. 7, the first clamping position is a plurality of clamping blocks 21 defined on an outer peripheral wall of the front end of the push rod 2 and circumferentially distributed at intervals; as shown in fig. 6, a first receiving groove 42 is formed in the rear end surface 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 corresponding to the clamping blocks 21 on the inner peripheral wall of the first receiving groove 42. When inserting the pump body 3 to casing 1 in to when rotating the pump body 3, the pump body 3 drives piston 4 and rotates, and when the pump body 3 was screwed to the front end of casing 1, the pump body 3 driven piston 4 rotated to the position department that each fixture block 21 all blocked and located a spacing groove 421, and piston 4 was fixed in the front end of push rod 2 this moment, can realize quick installation.

With continued reference to fig. 6, in the present embodiment, the piston 4 includes: a piston body 43, a sealing portion 44 connected to a front end of the piston body 43, and a connecting body 45 connected to a rear end of the piston body 43, wherein the piston 4 is elastically deformed by the sealing portion 44 and received in the piston cavity 32, and the first receiving groove 42 is opened in the connecting body 45. The piston body 43 is a rigid body, such as a metal piece, the sealing portion 44 and the connecting body 45 are elastic pieces and are connected to the piston body 43 through injection molding or interference fit or welding, the sealing portion 44 is connected with the piston cavity 32 in a sealing and abutting mode, and the connecting body 45 is used for being fixedly connected with the push rod 2 and connected with the pump body 3 in a sliding mode.

Further, the connecting body 45 in this embodiment includes a front section 451, a transition section 452, and a rear section 453 connected in sequence from front to back, where the front section 451 and the rear section 453 are both 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, the other end of the connecting rod 4521 is connected to the rear section 453, an inner side surface of the connecting rod 4521 has a stopper 4521b, and the stopper 4521b and a rear end surface of the piston body 43 define the limiting groove 421 therebetween; when the pistons 4 are rotated to the clamping blocks 21 of the push rod 2 and clamped in the limiting grooves 421, the pistons 4 can be fixed to the front end of the push rod 2, and conversely, when the pistons 4 need to be detached from the push rod 2, the pistons are rotated to the position where the clamping blocks 21 are located between the two adjacent connecting rods 4521.

Further, in this embodiment, an internal thread 11 is formed in the connecting hole 13, a connecting portion 31 engaged with the internal thread 11 is formed on the outer peripheral wall of the pump body 3, and the pump body 3 and the housing 1 are screwed together, so that the self-locking performance can be further improved, and the pump body 3 is prevented from being separated from the housing 1 due to vibration during system operation.

In order to flexibly screw the pump body 3 into the internal thread 11 of the housing 1, in the present embodiment, at least two connecting portions 31 are circumferentially provided on the outer circumferential wall of the pump body 3; correspondingly, as shown in fig. 8, a spiral protrusion 111 is disposed on an inner side wall of the front end of the housing 1, the protrusion 111 extends along an axial direction of the piston cavity 32 and defines a spiral screwing groove 112, the protrusion 111 and the screwing groove 112 form the internal thread 11, at least two mounting grooves 1111 corresponding to the respective connecting portions 31 one by one and communicating with the screwing groove 112 are disposed on a rear side surface of the protrusion 111, and one mounting groove 1111 is defined at a rear end portion of the protrusion 111.

Specifically, when the pump body 3 includes two connecting portions 31, two mounting grooves 1111 are formed on the protruding portion 111 of the housing 1, as shown in fig. 8; when the pump body 3 is inserted, the two connecting portions 31 are respectively aligned with the corresponding mounting grooves 1111, so that the connecting portions 31 are inserted into the screwing grooves 112, as shown in the state one in fig. 9, after the pump body 3 is rotated clockwise by 60 degrees along the screwing grooves 112, as shown in the state two in fig. 9, the pump body 3 is tightly fastened with the housing 1 through threads.

In the present embodiment, the internal thread 11 on the housing 1 is preferably a trapezoidal thread, a round thread, a zigzag thread, or a square thread; the thread forms comprise metric threads, American threads, English threads and the like; the tightness can be further ensured, and the pump body 3 can be screwed in flexibly.

As an alternative to the above technical solution, in the present embodiment, a screw groove in an irregular gradual form may also be provided in the connection hole 13.

In order to ensure that the pump body 3 and the shell 1 are still reliably connected in the operation process of the pumping system, a positioning seat 12 is defined along the circumferential direction of the inner side wall of the shell 1, a rotating seat 5 is further arranged in the shell 1 in a sliding manner, the rotating seat 5 is positioned at the front end of the positioning seat 12, the rear end of the pump body 3 is abutted against the rotating seat 5, an elastic sheet 6 is arranged between the rotating seat 5 and the positioning seat 12, and the elastic sheet 6 can provide a pretightening force between the shell 1 and the pump body 3, so that the pump body 3 is effectively prevented from falling off from the shell 1 when vibration occurs in the operation process of the system.

More specifically, in the present embodiment, a driving mechanism is further disposed in the housing 1, a power output end of the driving mechanism is connected to the push rod 2, and the driving mechanism can drive the push rod 2 to linearly reciprocate along the piston cavity 32, so as to pressurize the medium in the piston cavity 32.

Further, the driving mechanism in this embodiment includes a transmission shaft 7 and a rotating disc 8 sleeved outside the transmission shaft 7, the transmission shaft 7 is eccentrically disposed with respect to the rotating disc 8, the push rod 2 is provided with a second accommodating groove 22 for accommodating the rotating disc 8, front and rear sides of the rotating disc 8 are respectively abutted to front and rear side walls of the second accommodating groove 22, the push rod 2 is provided with a second sliding groove 23 extending along the axial direction of the piston cavity 32, and the transmission shaft 7 passes through the second sliding groove 23 and is rotatably connected to the housing 1; because 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, the push rod 2 can be pushed to linearly reciprocate.

Illustratively, as shown in fig. 5, the lower end of the transmission shaft 7 penetrates through the housing 1, and the end of the transmission shaft 7 protruding out of the housing 1 is used for connecting with the power output end of the motor.

In this embodiment, the push rod 2 is located both sides of carousel 8 all are equipped with bearing 9, bearing 9 install in the casing 1, bearing 9 plays the supporting role to push rod 2, owing to all be provided with bearing 9 at the preceding, the back both ends of push rod 2 to can reduce the moment of flexure effect of carousel 8 rotation in-process, straightness accuracy when guaranteeing push rod 2 to remove.

To sum up, the embodiment of the present invention provides a pumping system, wherein a pump body of the pumping system is connected with a casing in a screwing manner, so that the axial positioning is accurate, and the pumping system has a high self-locking characteristic, thereby ensuring the firmness of the pumping system in the operation process and reducing the noise; in addition, the pumping system in the embodiment is provided with a limit structure for sewing the piston to rotate relative to the pump body between the piston and the pump body, so that the free rotation is avoided in the axial movement process of the piston, and the abrasion performance of the piston can be greatly reduced.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and replacements can be made without departing from the technical principle of the present invention, and these modifications and replacements should also be regarded as the protection scope of the present invention.

Claims

1. A pumping system, comprising:

the front end of the shell is provided with a connecting hole;

2. The pumping system of claim 1, wherein the limiting structure includes a first sliding groove defined in the rear end of the pump body and extending in the axial direction of the piston chamber, and a guide portion provided on the outer peripheral wall of the piston, the guide portion being slidably provided in the first sliding groove.

3. The pumping system of claim 2, wherein the front end of the pushrod has a first snap-fit location and the piston has a second snap-fit location;

4. The pumping system of claim 3, wherein the first catch is at least one catch defined on a peripheral wall of the forward end of the push rod;

5. The pumping system of claim 4, wherein a plurality of blocks are circumferentially spaced apart from one another on an outer circumferential wall of the front end of the push rod, and a plurality of retaining grooves corresponding to the blocks one to one are formed in an inner circumferential wall of the first receiving groove.

6. The pumping system of claim 5, wherein the piston comprises: the piston comprises a piston body, a sealing part 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 accommodated in the piston cavity through elastic deformation of the sealing part, and the first accommodating groove is formed in the connecting body.

7. The pumping system of claim 6, wherein the connecting body comprises a front section, a transition section and a rear section, the front section and the rear section are sequentially connected from front to back, the front section and the rear section are both annular, the front section is connected with the piston body, the transition section comprises a plurality of connecting rods which are distributed at intervals, one ends of the connecting rods are connected with the front section, the other ends of the connecting rods are connected with the rear section, the inner side surfaces of the connecting rods are provided with stoppers, and the limiting grooves are defined between the stoppers and the rear end surface of the piston body.

8. The pumping system of claim 1, wherein the connecting hole has an internal thread formed therein, and the outer peripheral wall of the pump body is provided with a connecting portion engaged with the internal thread.

9. The pumping system of claim 8, wherein the outer peripheral wall of the pump body is circumferentially provided with at least two of the connecting portions,

10. The pumping system of claim 8, wherein the internal thread is a trapezoidal thread or a round thread or a buttress thread or a square thread.

11. The pumping system of any one of claims 1-10, wherein a positioning seat is circumferentially defined along an inner sidewall of the housing, a rotating seat is slidably disposed in the housing, the rotating seat is located at a front end of the positioning seat, a rear end of the pump body abuts against the rotating seat, and an elastic sheet is disposed between the rotating seat and the positioning seat.

12. The pumping system of claim 1, further comprising a drive mechanism disposed within the housing, the drive mechanism capable of driving the pushrod to reciprocate linearly along the piston chamber.

13. The pumping system of claim 12, wherein the driving mechanism includes a transmission shaft and a rotating disc sleeved outside the transmission shaft, the transmission shaft is eccentrically disposed with respect to the rotating disc, the push rod is provided with a second receiving groove for receiving the rotating disc, front and rear sides of the rotating disc are respectively abutted against front and rear side walls of the second receiving groove, the push rod is provided with a second sliding groove extending along an axial direction of the piston cavity, and the transmission shaft passes through the second sliding groove and is rotatably connected to the housing.

14. A pumping system as in claim 13, wherein the push rod is sleeved with bearings on both sides of the rotating disc, the bearings being mounted in the housing.