阅读说明：本技术 悬挂式浮动柱塞机构、输液泵及液相色谱仪 (Suspension type floating plunger mechanism, infusion pump and liquid chromatograph ) 是由 罗阁 李志伟 宋瑶 张振方 *** 王岱杰 于 2020-09-01 设计创作，主要内容包括：本发明提供了一种悬挂式浮动柱塞机构、输液泵及液相色谱仪,涉及液相色谱仪技术领域,本发明提供的悬挂式浮动柱塞机构,包括：柱塞连接件和柱塞件；柱塞件用于与泵头组件配合；柱塞件与柱塞连接件连接,柱塞连接件用于带动柱塞件沿柱塞件的轴向移动；沿柱塞件的任意径向方向,柱塞件相对于柱塞连接件具有活动余量。本发明提供的悬挂式浮动柱塞机构,可以实现柱塞件浮动安装,进而缓解柱塞件偏磨的技术问题。(The invention provides a suspension type floating plunger mechanism, an infusion pump and a liquid chromatograph, relating to the technical field of liquid chromatographs, wherein the suspension type floating plunger mechanism provided by the invention comprises: a plunger connecting piece and a plunger piece; the plunger piece is used for matching with the pump head assembly; the plunger piece is connected with the plunger connecting piece, and the plunger connecting piece is used for driving the plunger piece to move along the axial direction of the plunger piece; the plunger member has a play margin with respect to the plunger coupling element in any radial direction of the plunger member. The suspension type floating plunger mechanism provided by the invention can realize floating installation of the plunger piece, thereby relieving the technical problem of eccentric wear of the plunger piece.)

1. A suspended floating plunger mechanism, comprising: a plunger coupling element (100) and a plunger element (200);

the plunger member (200) is for mating with a pump head assembly (500);

the plunger piece (200) is connected with the plunger connecting piece (100), and the plunger connecting piece (100) is used for driving the plunger piece (200) to move along the axial direction of the plunger piece (200);

the plunger element (200) has a play margin with respect to the plunger piston joint element (100) in any radial direction of the plunger element (200).

2. The hanging floating plunger mechanism of claim 1, wherein said plunger member (200) comprises: a body portion (210) and a boss portion (220) connecting the body portion;

the plunger connecting piece (100) is provided with a clamping groove (110) and a plunger mounting hole (120) communicated with the clamping groove (110), and the diameter of the plunger mounting hole (120) is smaller than the radial size of the boss part (220);

the boss portion (220) is mounted to the card slot (110), and the body portion (210) passes through the plunger mounting hole (120).

3. The hanging floating plunger mechanism of claim 2, wherein the radial dimension of the snap groove (110) is greater than the diameter of the boss portion (220), and the diameter of the plunger mounting hole (120) is greater than the diameter of the body portion (210).

4. The hanging floating plunger mechanism according to claim 2, wherein said snap groove (110) has a push-acting surface (111) and a pull-acting surface (112), said boss portion (220) being located between said push-acting surface (111) and said pull-acting surface (112), said push-acting surface (111) and said pull-acting surface (112) being spaced apart by a distance greater than an axial dimension of said boss portion (220).

5. Suspension type floating plunger mechanism according to claim 4, characterized in that the end surface of the boss part (220) facing the thrust action surface (111) is configured as a spherical surface protruding towards the thrust action surface (111).

6. Suspension type floating plunger mechanism according to claim 1, characterized in that the end of the plunger piston element (100) facing away from the plunger piston element (200) is fitted with a wheel element (300), the axis of the wheel element (300) being perpendicular to the axis of the plunger piston element (100).

7. An infusion pump, comprising: a base (400), a pump head assembly (500), a drive assembly (600) and a suspended floating plunger mechanism according to any one of claims 1 to 6;

said base (400) being connected to said pump head assembly (500), said drive assembly (600) being mounted to said base (400), said plunger member (200) being fitted to said pump head assembly (500);

the drive assembly (600) is for driving the plunger coupling (100) to move relative to the pump head assembly (500).

8. The infusion pump according to claim 7, wherein the drive assembly (600) comprises: the cam (620) is rotatably connected to the base (400), and the cam (620) is in transmission connection with the driving piece (610);

the circumferential surface of the cam (620) abuts against the suspended floating plunger mechanism.

9. The infusion pump according to claim 8, characterized in that an elastic means (700) is mounted in said base (400), said elastic means (700) abutting said plunger connection (100), and said elastic means (700) having a tendency to cause said hanging floating plunger mechanism to abut said cam (620).

10. A liquid chromatograph comprising the infusion pump of any of claims 7-9.

Technical Field

The invention relates to the technical field of liquid chromatographs, in particular to a suspension type floating plunger mechanism, an infusion pump and a liquid chromatograph.

Background

When the high-pressure infusion pump works, the plunger needs to be matched with the sealing ring for ensuring the sealing property. Because the pressure of dozens of megapascals needs to be endured, and the mobile phase needs to be continuously conveyed, the abrasion and the leakage of the sealing ring occur sometimes, and once the leakage occurs, the liquid chromatograph cannot normally operate. Due to the influence of machining precision and mechanical assembly precision, the phenomenon that the plunger rod eccentrically grinds the sealing ring sometimes occurs, the non-concentricity of the plunger rod and the sealing ring can expand the sealing ring to one side in motion, local eccentric grinding is carried out on one side of the sealing ring, and the sealing ring is easy to leak.

Disclosure of Invention

The invention aims to provide a suspension type floating plunger mechanism, an infusion pump and a liquid chromatograph, which can realize floating installation of a plunger piece and further relieve the technical problem of eccentric wear of the plunger piece.

In a first aspect, the present invention provides a suspended floating plunger mechanism comprising: a plunger connecting piece and a plunger piece;

the plunger piece is used for matching with the pump head assembly;

the plunger piece is connected with the plunger connecting piece, and the plunger connecting piece is used for driving the plunger piece to move along the axial direction of the plunger piece;

the plunger element has a play margin with respect to the plunger coupling element in any radial direction of the plunger element.

With reference to the first aspect, the present invention provides a first possible implementation manner of the first aspect, wherein the plunger member includes: a body portion and a boss portion connected to the body portion;

the plunger connecting piece is provided with a clamping groove and a plunger mounting hole communicated with the clamping groove, and the diameter of the plunger mounting hole is smaller than the radial size of the boss part;

the boss portion is mounted to the catch, and the body portion passes through the plunger mounting hole.

With reference to the first possible implementation manner of the first aspect, the present invention provides a second possible implementation manner of the first aspect, wherein a radial dimension of the card slot is larger than a diameter of the boss portion, and a diameter of the plunger mounting hole is larger than a diameter of the body portion.

With reference to the first possible implementation manner of the first aspect, the present invention provides a third possible implementation manner of the first aspect, wherein the clamping groove has a pushing force acting surface and a pulling force acting surface, the boss portion is located between the pushing force acting surface and the pulling force acting surface, and a distance between the pushing force acting surface and the pulling force acting surface is larger than an axial dimension of the boss portion.

With reference to the third possible embodiment of the first aspect, the present invention provides a fourth possible embodiment of the first aspect, wherein an end surface of the boss portion facing the thrust acting surface is configured as a spherical surface that is convex toward the thrust acting surface.

With reference to the first aspect, the present invention provides a fifth possible implementation manner of the first aspect, wherein an end of the plunger piston connecting element facing away from the plunger piston is provided with a wheel element, and an axis of the wheel element is perpendicular to an axis of the plunger piston connecting element.

In a second aspect, the present invention provides an infusion pump comprising: a base, a pump head assembly, a drive assembly and the suspended floating plunger mechanism of the first aspect;

the base is connected with the pump head assembly, the driving assembly is mounted on the base, and the plunger piece is matched with the pump head assembly;

the drive assembly is for driving the plunger coupling member to move relative to the pump head assembly.

With reference to the second aspect, the present invention provides a first possible implementation manner of the second aspect, wherein the driving assembly includes: the cam is rotationally connected to the base and is in transmission connection with the driving piece;

the circumferential surface of the cam abuts against the suspension type floating plunger mechanism.

In combination with the first possible implementation manner of the second aspect, the present invention provides a second possible implementation manner of the second aspect, wherein an elastic means is mounted in the base, the elastic means abuts against the plunger coupling member, and the elastic means has a tendency to make the suspended floating plunger mechanism abut against the cam.

In a third aspect, the present invention provides a liquid chromatograph including the infusion pump of the second aspect.

The embodiment of the invention has the following beneficial effects: adopt plunger spare to be connected with the plunger connecting piece, drive the plunger spare through the plunger connecting piece and along axial displacement, along the arbitrary radial direction of plunger spare, the plunger spare has the allowance for the plunger connecting piece to realize that the plunger spare floats and connect in the plunger connecting piece, and then alleviate the plunger spare and produce the eccentric wear for pump head assembly, be favorable to prolonging the life of suspension type plunger mechanism that floats.

In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention or related technologies, the drawings used in the description of the embodiments or related technologies will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

FIG. 1 is a schematic view of a suspended floating plunger mechanism provided by an embodiment of the present invention;

FIG. 2 is a top view of a suspended floating plunger mechanism provided by an embodiment of the present invention;

FIG. 3 is a schematic view of an infusion pump provided in accordance with an embodiment of the present invention;

FIG. 4 is a semi-sectional view of an infusion pump provided in accordance with an embodiment of the present invention;

fig. 5 is a schematic diagram of a plunger coupling element, a plunger element, a wheel element and a base of an infusion pump according to an embodiment of the invention.

Icon: 100-plunger connecting element; 110-card slot; 111-thrust acting surface; 112-tension acting surface; 120-plunger mounting hole; 130-an axle; 200-a plunger element; 210-a body portion; 220-a boss portion; 300-wheel member; 400-a base; 410-a chute; 500-a pump head assembly; 600-a drive assembly; 610-a driver; 620-cam; 700-elastic device.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. The term "physical quantity" in the formula, unless otherwise noted, is understood to mean a basic quantity of a basic unit of international system of units, or a derived quantity derived from a basic quantity by a mathematical operation such as multiplication, division, differentiation, or integration.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.