Spring one-way valve structure for liquid phase infusion pump

Abstract

The utility model discloses a spring one-way valve structure for a liquid phase infusion pump, which comprises a one-way valve ball seat, a spring, a spring and a spring, the one-way valve jewel ball is a ball body and is matched and sealed with the one-way valve ball seat; a center hole is formed in the one-way valve ball cage, and a petal-shaped circular groove is formed in the lower end of the one-way valve ball cage; a one-way valve spring; the one-way valve plug is provided with a central hole through which liquid flows, and one end of the one-way valve plug is provided with a step for sealing the one-way valve jacket and the one-way valve ball seat; the one-way valve outer sleeve is provided with a center hole for liquid to flow through, the upper end of the one-way valve outer sleeve is provided with a circular groove for installing the one-way valve plug, and the lower end of the one-way valve outer sleeve is provided with a circular groove for installing the one-way valve ball cage, the one-way valve spring, the one-way valve ball, the one-way valve ball seat and the one-way valve plug. According to the utility model, the convenience and fault tolerance of the liquid phase infusion pump are increased in some special use scenes.

Description

TECHNICAL FIELD

[0001] The utility model relates to a spring check valve structure for liquid phase infusion pump, apply on the infusion pump of liquid phase, belong to the field of liquid chromatography. BACKGROUND

[0002] The existing check valve of each manufacturer infusion pump usually uses springless check valve, which mainly relies on the self-weight of the ball in the check valve to complete closing, and relies on the flow of liquid to push open the ball to complete opening and closing action, thereby realizing the function of one-way flow. For example, CN218439704U, a check valve structure capable of realizing automatic liquid suction of infusion pump. However, the scope of application of the infusion pump is wider, and it cannot meet some special use scenarios. At present, the main application scenarios of this structure are summarized as follows: 1. When the customer uses the infusion pump, if the liquid in the pump head is completely emptied for a long time, the customer needs to use other power sources to suck the mobile phase into the pump head when the pump head cavity is filled with the mobile phase again. Such use conditions are not convenient for customers to use; 2. The motor used on the infusion pump is generally a stepper motor, which may cause resonance of the infusion pump together with the motor at certain speed, so that the opening and closing action of the check valve is not ideal during continuous infusion of the infusion pump, and the flow rate is small; 3. When the viscosity of the mobile phase of the infusion pump is large (higher than 20 cp), the closing speed of the ball of the conventional check valve is also not timely, so that the flow rate of the infusion pump is small.

[0003] For the above-mentioned pain points, the structure of the product needs to be improved, so that the infusion pump can be used in more scenarios, and the convenience and fault tolerance of use are increased. INVENTION CONTENTS

[0004] The utility model aims at providing a spring check valve structure for liquid phase infusion pump, which solves the above-mentioned problems. The structure of the utility model can make the infusion pump complete self-suction function. Under the conditions of infusion pump resonance and large viscosity of mobile phase, the spring check valve can still ensure the accurate flow rate of the infusion pump, so that the infusion pump can be used in more scenarios.

[0005] A spring check valve structure for liquid phase infusion pump, comprising:

[0006] A check valve ball seat is provided with a central hole for flowing liquid, and a spherical chamfer is provided at the central hole for sealing with a check valve gem ball;

[0007] The check valve gem ball is a spherical body with roughness for sealing with the check valve ball seat;

[0008] The check valve ball cage is provided with a central hole, and the lower end of the check valve ball cage is provided with a petal-shaped circular groove for limiting the check valve gem ball to jump high without affecting the change of the flow area;

[0009] Check valve spring

[0010] Check valve plug, which is provided with a central hole for flowing liquid, and one end is provided with a step for sealing with the check valve sleeve and the check valve ball seat;

[0011] Check valve sleeve, which is provided with a central hole for flowing liquid, and the upper end is provided with a circular groove for installing the check valve plug, and the lower end is provided with a circular groove for installing the check valve ball cage, the check valve spring, the check valve ball, the check valve ball seat and the check valve plug;

[0012] The material of the spring is 316 stainless steel, or hastelloy, or titanium alloy.

[0013] The material of the check valve sleeve is 316 stainless steel, or hastelloy, or titanium alloy.

[0014] The material of the check valve plug is PEEK or PCTFE.

[0015] The material of the check valve ball cage is PEEK or PCTFE.

[0016] The spring check valve structure is installed in the upper and lower valve bodies of the pump head, cooperates with the action of the pump switch, and completes the function of sucking and discharging liquid.

[0017] The spring check valve structure for the liquid phase infusion pump has the advantages and effects that: the infusion pump can complete the function of automatically sucking and discharging liquid in the case that there is no liquid in the internal cavity, greatly facilitating the use of customers; the existing conventional check valve cannot be closed in time due to the vibration problem of the motor at certain rotating speeds during the operation of the pump, and the flow rate is small in a macroscopic view, but the problem is obviously improved to an accurate flow rate after the structure is used; in the case of using high viscosity mobile phase, the existing conventional check valve ball falls slowly, and the flow rate is also seriously small, but the problem is obviously improved to normal flow rate after the structure is used. In summary, the structure of the utility model increases the convenience and fault tolerance in some special use scenarios of the liquid phase infusion pump. BRIEF DESCRIPTION OF DRAWINGS

[0018] The drawings are included in the specification to provide a further understanding of the application, and are incorporated into the specification and constitute a part of the specification, the drawings express the embodiments of the utility model, and are used together with the specification to explain the principles of the utility model. In the drawings:

[0019] Figure 1 It is the overall structure of the utility model explosion view upper shaft side view.

[0020] Figure 2It is the integral structure explosion map lower shaft side view of the utility model.

[0021] The specific reference numerals in the figure are as follows:

[0022] 1.1 one-way valve ball seat 1.2 one-way valve gem ball

[0023] 1.3 one-way valve ball cage 1.4 one-way valve spring

[0024] 1.5 one-way valve plug 1.6 one-way valve sleeve

[0025] 1.1.1 one-way valve ball seat center hole 1.1.2 one-way valve ball seat spherical chamfer

[0026] 1.3.1 one-way valve ball cage center hole 1.3.2 one-way valve ball cage petal-shaped circular groove

[0027] 1.5.1 one-way valve plug center hole 1.5.2 one-way valve plug step

[0028] 1.6.1 one-way valve sleeve center hole 1.6.2 one-way valve sleeve upper end circular groove

[0029] 1.6.3 one-way valve sleeve lower end circular groove DETAILED DESCRIPTION

[0030] The structure of the utility model will be further described below in conjunction with the drawings of the specification.

[0031] The terms "front", "back", "upper", "lower" and the like in the specification and claims are generally used for descriptive purposes and do not necessarily describe exclusive relative positions. Here, for convenience, the side viewed from above is defined as upper, and the side viewed from the pump head is defined as lower.

[0032] The utility model relates to a spring one-way valve structure for liquid phase infusion pump, as shown in Figure 1 and 2 Specifically includes:

[0033] One-way valve ball seat 1.1, which is provided with one-way valve ball seat center hole 1.1.1 in the middle for flowing liquid, and is provided with one-way valve ball seat spherical chamfer 1.12 around the one-way valve ball seat center hole for sealing with one-way valve gem ball;

[0034] One-way valve gem ball 1.2, which is a spherical body with good roughness for sealing with one-way valve gem ball seat;

[0035] One-way valve ball cage 1.3, which is provided with one-way valve ball cage center hole 1.3.1; the lower end is provided with one-way valve ball cage petal-shaped circular groove 1.3.2 for limiting one-way valve gem ball jumping height without affecting the change of flow path cross-sectional area;

[0036] The spring 1.4 of the one-way valve ensures that the force of the spring meets the force of the opening ball at 5%-15% of atmospheric pressure, so that the pump can be opened during self-priming, and the flow phase is placed higher than the pump, and the flow phase self-flow phenomenon does not occur;

[0037] The one-way valve plug 1.5 is provided with a one-way valve plug center hole 1.5.1 for flowing liquid, and one end is provided with a one-way valve plug step 1.5.2 for sealing with the one-way valve sleeve and the one-way valve ball seat;

[0038] The one-way valve sleeve 1.6 is provided with a one-way valve sleeve center hole 1.6.1 for flowing liquid, and the upper end is provided with a one-way valve sleeve upper end circular groove 1.6.2 for installing the one-way valve plug; and the lower end is provided with a one-way valve sleeve lower end circular groove 1.6.3 for installing the one-way valve ball cage, the one-way valve spring, the one-way valve ball, the one-way valve ball seat and the one-way valve plug.

[0039] The material of the spring is 316 stainless steel, Hastelloy or titanium alloy.

[0040] The material of the one-way valve sleeve is 316 stainless steel, Hastelloy or titanium alloy.

[0041] The material of the one-way valve plug is PEEK or PCTFE.

[0042] The material of the one-way valve ball cage is PEEK or PCTFE.

[0043] The installation process of the spring one-way valve structure for the liquid phase infusion pump is as follows: the one-way valve ball cage 1.3 is installed in the one-way valve sleeve lower end circular groove 1.6.3, then the one-way valve spring 1.4 is installed in the one-way valve ball cage petal type circular groove 1.3.2, then the one-way valve ball 1.2 is placed on the one-way valve ball cage petal type circular groove 1.3.2, then the one-way valve ball seat 1.1 is installed in the one-way valve sleeve lower end circular groove 1.6.3, then one one-way valve plug 1.5 is installed in the one-way valve sleeve lower end circular groove 1.6.3 through interference fit, and another one-way valve plug 1.5 is installed in the one-way valve sleeve upper end circular groove 1.6.2 through interference fit, and the final assembly process is completed; the combined spring one-way valve structure is installed in the upper and lower valve bodies of the infusion pump pump head, cooperates with the infusion pump to perform switching action, and completes the function of sucking and discharging liquid.

Claims

1. A spring check valve structure for a liquid phase infusion pump, characterized by: The structure comprises: a one-way valve ball seat, which is provided with a center hole for flowing liquid, and a spherical chamfer for sealing with a one-way valve jewel ball; a one-way valve jewel ball, which is a sphere, and cooperates with the one-way valve ball seat to seal; a one-way valve ball cage, which is provided with a center hole, and a petal-shaped circular groove at the lower end; a one-way valve spring; a one-way valve plug, which is provided with a center hole for flowing liquid, and a step at one end for sealing with a one-way valve outer sleeve and a one-way valve ball seat; a one-way valve outer sleeve, which is provided with a center hole for flowing liquid, a circular groove at the upper end for installing a one-way valve plug, and a circular groove at the lower end for installing a one-way valve ball cage, a one-way valve spring, a one-way valve ball, a one-way valve ball seat, and a one-way valve plug.

2. The spring check valve structure of claim 1, wherein: The one-way valve jewel ball and the ball seat are cooperatively sealed.

3. The spring check valve structure of claim 1, wherein: The spring is made of 316 stainless steel, Hastelloy, or titanium alloy.

4. The spring check valve structure of claim 1, wherein: The one-way valve outer sleeve is made of 316 stainless steel, Hastelloy, or titanium alloy.

5. The spring check valve structure of claim 1, wherein: The one-way valve plug is made of PEEK or PCTFE.

6. The spring check valve structure of claim 1, wherein: The one-way valve ball cage is made of PEEK or PCTFE.

7. A liquid infusion pump characterized by: The spring one-way valve structure according to any one of claims 1-6 is installed in the upper and lower valve bodies of a pump head of an infusion pump.

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