JP5156899B2 - Valve and volume-variable pump having the valve - Google Patents

Description

  The present invention relates to a valve in a diaphragm pump or the like, and a small volume variation type micro pump having the valve.

Conventionally, as a volume-variable pump, a pump using a piston, a diaphragm, or the like is generally known, but among them, a micropump for feeding a small amount of liquid has many mechanism principles, for example, There are a reed valve type and a valveless type in the valve mechanism, and a micropump having a mechanism such as a diaphragm type and a piston type using a small motor in the drive system has been generally known.

  This type of micropump is used as a microfluid supply device for medical equipment and chemical analysis equipment, and is used for transporting fluids such as quantitative injection of chemicals and reaction gas mixtures, and is now a compact that can be controlled with higher accuracy. The development of versatile micro pumps is underway.

  In such a volume variation type micro pump, a movable member such as a diaphragm is reciprocally driven, a pump chamber is formed by the movable member, and a suction valve and a discharge valve for supplying and discharging fluid are provided in the pump chamber. As a valve molded body, there is a valve structure as described below (Patent Document 1).

  This is because the outer peripheral portion of the valve molded body that functions as the valve is sandwiched and fixed between the receiving members so that it also serves as a seal portion, and an annular thick portion formed from an elastic material, A pump valve structure characterized by comprising a convex portion serving as an on-off valve, a thin arm portion that connects the convex portion and the outer peripheral portion and is movable when the valve is opened and closed.

According to the valve structure according to the above prior art, the entire circumference of the convex portion that opens and closes the hole for sucking and discharging the fluid is in a line contact state in a ring shape with respect to the peripheral portion of the hole. As a result, the reverse flow blocking of the fluid is more excellent, and it has the effect that highly accurate control can be performed.
JP2001-12356

  However, in the valve structure of the conventional diaphragm type micro pump, in order to obtain a sealing effect such as prevention of liquid leakage, the outer peripheral portion of the valve is sandwiched between pump members when the valve is assembled, and is compressed and fixed. At this time, in order to obtain a higher sealing effect, it was necessary to increase the compressive stress of the sandwiched portion.

  Further, when the outer peripheral portion of the valve is compressed and deformed in the vertical direction, the outer peripheral portion of the valve is elongated in the lateral direction according to the Poisson's ratio. Thereby, for example, as shown in the perspective view of FIG.

  The influence of the distortion of the valve portion appears more prominently when the valve is further downsized and thinned by downsizing the pump.

  Due to the distortion of the valve portion, problems such as a decrease in the flow rate accuracy of the pump due to a decrease in the check valve mechanism of the valve may occur.

  Accordingly, the present invention provides a volume variable pump having a valve structure that solves the above-described problems, simplifies the valve structure, and enables further miniaturization and thickness reduction without causing distortion in the valve portion. The purpose is to do.

The invention according to claim 1 is a valve-forming comprising a flexible rubber member in a variable volume pump having a suction port and a discharge port and generating a pressure difference inside and outside the pump chamber by a reciprocating motion of a diaphragm or a piston. An arm that connects the valve surface of the valve molded body and the outer peripheral portion of the valve molded body is divided into one of the valve surface and the outer peripheral portion, and the arm is a curved portion. The volume-variable pump is characterized by having at least two arms with respect to one valve surface .

According to a second aspect of the present invention, in the volume variable pump according to the first aspect, at least two or more valves are integrally formed adjacent to each other with the valve surfaces in opposite directions. This is a variable volume pump .

  In the present invention, in the valve molded body made of a flexible material, one side of each arm connecting the valve surface and the outer peripheral portion of the valve molded body is divided and connected, so that the valve molded body is a seal portion. Since the arm absorbs the bending that occurs when the outer periphery is clamped and fixed, the bending transmitted to the valve surface can be reduced.

  Moreover, the function as a buffer part which absorbs bending further improves by making the shape of an arm into the shape which has a curved part.

The valve molded body of the present invention achieves the same effect even when a plurality of units are integrally molded with the valve surface, the outer peripheral portion, and a portion composed of a plurality of arms as one unit. Moreover, the form of the pump at this time does not matter.

  Hereinafter, a volume-variable pump according to the best mode of the present invention and a valve shape thereof will be described with reference to the accompanying drawings.

  FIG. 1 shows a cross-sectional view of a variable volume pump 1 according to the present invention. This is because the connecting slider 3 moves up and down by the rotational force of the drive source output shaft 2. At this time, the diaphragm 4 fixed to the connecting slider 3 also moves up and down, and performs a pump operation by fluctuations in pressure applied to the pump chamber 5.

  FIG. 2A is a top view of the valve molded body 10 which is the best mode of the present invention. Furthermore, the AA cross section of a valve molded object is shown in FIG.2 (b).

  The valve molded body 10 includes a valve surface 13, a valve outer peripheral portion 14, and an arm 15, and an arm 15 having the same shape that connects the valve surface 13 and the valve outer peripheral portion 14 extends from three locations on the valve outer peripheral portion. As a result, a valve having a curved portion and a through hole with a curvature in the arm 15 is formed, and the valve surface of the valve is in the reverse direction. Adjacent and integrally molded.

  When the valve molded body 10 is assembled into the variable volume pump 1, the valve outer peripheral portion (seal portion) 14 of the valve molded body is pushed by the valve head 6 and is compressed and deformed. It becomes possible to prevent the liquid leakage from 7 or the like.

Further, the arm 15 having a curved shape in the through hole and the outer periphery functions as a buffer portion, so that it is possible to absorb the bending caused by the compression deformation of the valve outer peripheral portion 14 and reduce the distortion of the valve surface 13.

  FIG. 3A is a perspective view of the valve molded body 10 which is the best mode of the present invention and whose top view is shown in FIG. FIG. 5A is a perspective view of an example of a conventional valve molded body that does not have the characteristics of the valve molded body according to the present invention.

  Fig. 3 (b) shows the valve molded body of Fig. 3 (a) using a rubber member. The outer diameter of the valve outer periphery as one unit is φ5.4mm, and the thickness of the valve outer periphery is 1mm. FIG. 5 is a perspective view showing how the valve molded body is bent by simulation using analysis software when the outer diameter of the valve surface is φ2 mm, the thickness of the arm is 0.4 mm, and the outer peripheral portion is compressed to the maximum.

  Similarly, FIG. 5B shows the deflection of the valve molded body when the valve outer periphery of the valve molded body of FIG. 5A is compressed to the maximum under the same conditions as in FIG. 3B except for the shape of the arm. It is the perspective view which showed the direction by simulation.

  By comparing FIG. 3B and FIG. 5B, the valve molded body according to the embodiment of the present invention absorbs the deflection at the buffer portion of the arm, and the valve surface is not distorted. In one example of the valve molded body, it can be seen that it is transmitted to the valve surface via the arm.

Specifically, in the case of FIG. 3B, which is an embodiment of the present invention, the amount of movement of the valve surface due to bending caused by compression of the outer peripheral portion of the valve is at most 2.173 × 10 ⁻⁴ mm or less. On the other hand, in the case of FIG. 5B, which is a conventional example, it is confirmed as a result of simulation that the moving amount of the valve surface is at least 6.517 × 10 ⁻⁴ mm.

  In the present invention, the above embodiment is the best mode. For example, as shown in FIG. 4A, an arm connecting the valve surface and the valve outer peripheral portion extends from two places on one side and is connected at four places. The arm extended from four or more of either one of the valve surface and the valve outer peripheral part may be further divided into a plurality and connected to the other. FIG. 4B shows a BB cross section of the embodiment of FIG.

  In the present invention, the outer shape of the arm connecting the valve surface and the valve outer peripheral portion, the shape of the through hole of the arm and the number of the through holes are not limited to those shown in the above embodiments.

  Further, any shape of the arm having a through hole capable of absorbing the bending caused by the compression deformation of the outer peripheral portion of the valve is included in the valve molded body of the present invention.

  Further, the present invention includes a volume-variable pump as shown in FIG. 1 in which the valves shown in FIGS. 2 to 4 are incorporated.

  The present invention can reduce the distortion generated in the valve, so that the reliability of the valve function can be improved, and can be used as a small-scale trace fluid supply device for use in medical equipment, chemical analysis equipment, and the like.

1 is a cross-sectional view of a variable volume pump 1 according to the best mode of the present invention. (A) It is a top view which shows the valve | bulb shape which concerns on the best form of this invention. (B) It is AA sectional drawing in (a). (A) It is a perspective view which shows the valve | bulb shape which concerns on the best form of this invention. (B) It is a perspective view which shows the shape at the time of compressing the outer peripheral part in the valve | bulb shape in (a). (A) It is a top view which shows the valve | bulb shape which concerns on the other form of this invention. (B) It is BB sectional drawing in (a). (A) It is a perspective view which shows an example of the conventional valve | bulb shape. (B) It is a perspective view which shows the shape at the time of compressing the outer peripheral part in the valve | bulb shape in (a).

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Volume change type pump 2 Drive source output shaft 3 Connecting slider 4 Diaphragm 5 Pump chamber 6 Valve head 7 Valve case 8 Diaphragm mount 9 Slider case 10 Valve 11 Suction port 12 Discharge port 13 Valve surface 13 "Valve surface back side 14 Valve outer periphery (Seal part)
15 Arm 16 Bending portion 17 Opening portion 18 Through hole

Claims (2)

In a volume-variable pump that has a suction port and a discharge port, and generates a pressure difference between the pump chamber and reciprocating movement ,
The volume-variable pump includes a valve molded body made of a flexible rubber member,
An arm that connects the valve surface of the valve molded body and the outer peripheral portion of the valve molded body is divided and connected to one of the valve surface and the outer peripheral portion, and
The arm has a curved portion,
A volume-variable pump characterized in that at least two arms are provided for one valve face.   The volume-variable pump according to claim 1, wherein at least two or more valves are integrally formed adjacent to each other with the valve surfaces in opposite directions.

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