JP2016200014A - Diaphragm Pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve assembling workability while restricting fluid leakage, reduce the number of component elements to attain cost reduction.SOLUTION: This invention comprises a first frame 6 and a second frame 7 having recesses 8 forming spaces H at each of parting planes 5, a diaphragm 3 held between the parting planes 5, 5 and parting the spaces H into a first chamber and a second chamber and connecting means 4 for connecting the first frame 6 and the second frame 7. The connecting means 4 includes a fastening component 15 forming an annular shape extending along an outer surface S of a case and resiliently fastening the frames toward inside the annular shape part. Fixing the fastening component 15 toward an orientation crossing at a right angle with the parting planes 5 causes the diaphragm 3 to be compressed and held between the parting planes 5, 5 with a fastening force of the fastening component 15.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a diaphragm pump that can improve assembly workability.

  In various types of analysis such as chemical inspection, environmental analysis, and biotechnology research, a diaphragm pump is used to deliver a fluid to be treated in an accurate amount. For example, Patent Document 1 below discloses a diaphragm pump having a structure in which a diaphragm is sandwiched between a pair of frames. In this diaphragm pump, the frames are coupled to each other by using a plurality of pairs of screws and nuts in order to suppress fluid leakage at the peripheral edge of the diaphragm.

  However, in the case of the above-described structure, there is a problem in that the assembly workability is impaired because labor and labor are required for fastening the screws and nuts. Further, since a large number of pairs of screws and nuts are required, the number of parts is increased, which hinders cost reduction.

Japanese Patent Laid-Open No. 11-183359

  The present invention has been devised in view of the above circumstances, and provides a diaphragm pump that can improve assembly workability while suppressing fluid leakage, and can reduce the number of parts to reduce costs. This is the main issue.

The present invention is a case composed of first and second frames that are divided into two by a dividing surface and each of the dividing surfaces has a recess that forms a space by abutting the dividing surfaces.
A diaphragm in which a peripheral edge is sandwiched between the divided surfaces, and the space is divided into a first chamber on the first frame side and a second chamber on the second frame side,
And connecting means for connecting the first frame and the second frame,
The connecting means includes a fastener that forms an annular shape extending along the outer surface of the case and elastically tightens toward the inner side of the annular shape,
In addition, by attaching the fastener in a direction orthogonal to the divided surface, the peripheral edge portion of the diaphragm is compressed and held between the divided surfaces by the fastening force of the fastener.

  In the diaphragm pump according to the present invention, it is preferable that an annular locking groove for preventing displacement of the fastener is provided on an outer surface of the case.

  In the diaphragm pump according to the present invention, it is preferable that the first frame and the second frame have the same shape.

  In the diaphragm pump according to the present invention, it is preferable that each of the dividing surfaces includes one or more fitting portions that prevent misalignment between the first frame and the second frame by being fitted to each other. .

  In the diaphragm pump according to the present invention, it is preferable that a plurality of fitting portions are arranged at equal intervals on each of the dividing surfaces.

  As described above, according to the present invention, in the structure in which the peripheral edge of the diaphragm is sandwiched between the dividing surfaces of the first and second frames, the first frame and the second frame are connected by a connecting means having a fastener. ing.

  The said fastener is elastic rings, such as a snap ring, for example, makes | forms the cyclic | annular form extended along the outer surface of a case, and can be clamp | tightened elastically toward the inner side of a cyclic | annular form. And by attaching this fastener in the direction orthogonal to the dividing surface, the fastening force can be applied in the thickness direction of the diaphragm. That is, the peripheral edge of the diaphragm can be compressed and held between the divided surfaces, and fluid leakage can be suppressed.

  In addition, since the connection can be performed only by attaching a fastener, the assembling workability can be improved and the number of parts can be reduced to reduce the cost.

It is sectional drawing which shows one Embodiment of the diaphragm pump of this invention. It is a perspective view of a diaphragm pump. It is a disassembled perspective view of a diaphragm pump. (A) is a fragmentary sectional view which shows the diaphragm in the uncompressed state before fastener attachment, (B) is a fragmentary sectional view which shows the diaphragm in the compression state after fastener attachment. (A) is a perspective view which shows other embodiment of a connection means, (B) is a side view which shows the effect | action. It is a perspective view which shows other embodiment of a connection means.

Hereinafter, embodiments of the present invention will be described in detail.
As shown in FIGS. 1 and 2, the diaphragm pump 1 of the present embodiment includes a case 2, a diaphragm 3, and connecting means 4.

  The case 2 includes first and second frames 6 and 7 that are divided into two by a dividing surface 5. In this example, the case 2 is formed in a spherical shape and is divided into two equal parts by a dividing surface 5 passing through the center P thereof. Each of the dividing surfaces 5 of the first and second frames 6 and 7 is provided with a recess 8, and the recesses 8 and 8 form a space H by abutting the dividing surfaces 5 and 5 with each other. . In FIGS. 2, 5 (A) and 6, the second frame 7 is indicated by a one-dot chain line, and the internal structure is shown through.

  The first and second frames 6 and 7 are each provided with a conduit 11 for introducing fluid into the space H from the outer surface S side. In this example, the nipple 10 for pipe connection is integrally formed, but a screw may be provided so that various joints can be connected. Further, one end of a flow path extending from each recess 8 is opened at the tip of the pipe line 11. Although the fluid introduction pipe 11 of this example is arranged in parallel with the dividing surface 5, the arrangement method is not necessarily limited as described above.

  Next, the diaphragm 3 is formed of a known rubber elastic material that can be compressed and deformed, and its peripheral edge 3E is sandwiched between the divided surfaces 5 and 5. The diaphragm 3 includes a main portion 3A that partitions the space H into a first chamber H1 on the first frame 6 side and a second chamber H2 on the second frame 7 side, and the outer periphery of the main portion 3A. It has a peripheral edge 3E.

  The diaphragm 3 is elastically deformed when, for example, a working fluid such as gas is charged / discharged into the first chamber H1, and the volume of the second chamber H2 is changed. Thereby, the diaphragm pump 1 can send out to-be-processed fluids, such as a sample, for example from the 2nd chamber H2 by fixed_quantity | quantitative_assay.

  As shown in FIGS. 4A and 4B, the main portion 3A has a film shape with a constant thickness, and the peripheral edge portion 3E is formed to be thicker than the main portion 3A. The peripheral edge 3E is compressed and held, thereby suppressing fluid leakage. In this example, a constricted portion 3B having a thickness smaller than that of the main portion 3A is disposed between the peripheral portion 3E and the main portion 3A, whereby distortion to the main portion 3A due to compression deformation of the peripheral portion 3E. To prevent the effects of Further, a seating portion 5A for seating the diaphragm 3 is recessed in the dividing surface 5. The seating portion 5A of this example is formed of a deep bottom portion 5A1 that receives the peripheral edge portion 3E and a shallow bottom portion 5A2 that receives the main portion 3A.

  As shown in FIGS. 2 and 3, each of the dividing surfaces 5 and 5 has one or more fitting portions 12 that prevent the first frame 6 and the second frame 7 from being displaced by being fitted to each other. It is formed. In this example, a case is shown in which a plurality of fitting portions 12 are arranged at regular intervals around the seating portion 5A. The fitting portion 12 is formed by a pair of a fitting pin 12A protruding from the dividing surface 5 and a fitting hole 12B that fits the fitting pin 12A. As shown in FIGS. 4A and 4B, the protrusion height h of the fitting pin 12 </ b> A is set to be larger than the compression amount δ of the diaphragm 3. Thus, when the diaphragm pump 1 is assembled, the first frame 6, the second frame 7, and the diaphragm 3 can be temporarily assembled prior to the connection by the connecting means 4. Further, positioning during temporary assembly and prevention of displacement can be performed.

  In this example, the even number of fitting portions 12 are arranged at equal intervals in the circumferential direction, and the fitting pins 12A and the fitting holes 12B are alternately arranged. Thereby, the 1st frame 6 and the 2nd frame 7 can be made into the same shape. Therefore, the first and second frames 6 and 7 can be manufactured using the same mold, and the manufacturing cost can be reduced.

  Next, the connecting means 4 connects the first frame 6 and the second frame 7. The connecting means 4 has an annular shape extending along the outer surface S of the case 2 and includes at least one fastener 15 that is elastically tightened toward the inner side of the annular shape.

  As the fastener 15, for example, a C-shaped snap ring (retaining ring) made of a metal material and having an annular part interrupted, and an O-ring made of a stretchable rubber elastic material and having an annular part not interrupted (see FIG. Various existing elastic rings, such as those shown in FIG.

  The fastener 15 is attached in a direction orthogonal to the dividing surface 5. Thereby, the fastening force of the fastener 15 can be applied in the thickness direction of the diaphragm 3. That is, the peripheral edge portion 3E of the diaphragm 3 can be compressed and held between the dividing surfaces 5 and 5. The fastener 15 is mounted in an annular locking groove 16 that is recessed in the outer surface S of the case 2, thereby preventing the displacement of the fastener 15 and preventing it from falling off.

  As described above, in the diaphragm pump 1, the connection between the first and second frames 6 and 7 is performed only by attaching the fastener 15 without using many pairs of screws and nuts. Therefore, assembly workability can be improved. Further, the number of parts for connection can be reduced, and the cost can be reduced.

  In this example, the case where the connection means 4 is comprised by the one fastener 15 is shown. In such a case, it is preferable to dispose the fastener 15 on a reference plane that is perpendicular to the dividing surface 5 and passes through the center P. Thereby, the peripheral part 3E can be uniformly compressed by one fastener 15. Further, as shown in FIG. 5A, the connecting means 4 can be constituted by a plurality of (for example, two) fasteners 15. At this time, it is preferable to arrange the plurality of fasteners 15 at symmetrical positions with the reference plane as the center in order to uniformly compress the peripheral edge portion 3E. In this case, as shown in FIG. 5B, the groove wall 16W near the reference plane Co (sphere center) in the groove wall 16W of the locking groove 16 is the side far from the reference plane Co (sphere center). Therefore, when the fastener 15 is attached, the groove wall 16Wi acts as a positioning stop wall.

  As described above, the particularly preferred embodiment of the present invention has been described in detail. However, the present invention is not limited to the illustrated embodiment, and the present invention is not limited to the illustrated embodiment. sell.

DESCRIPTION OF SYMBOLS 1 Diaphragm pump 2 Case 3 Diaphragm 3E Peripheral part 4 Connection means 5 Dividing surface 6 1st frame 7 2nd frame 8 Concave part 12 Fitting part 15 Fastener 16 Locking groove H Space S Outer surface

Claims (5)

A case composed of first and second frames which are divided into two by a dividing surface and each has a concave portion which forms a space by abutting the dividing surfaces against each other;
A diaphragm in which a peripheral edge is sandwiched between the divided surfaces, and the space is divided into a first chamber on the first frame side and a second chamber on the second frame side,
And connecting means for connecting the first frame and the second frame,
The connecting means includes a fastener that forms an annular shape extending along the outer surface of the case and elastically tightens toward the inner side of the annular shape,
Moreover, the diaphragm pump is characterized in that the peripheral edge of the diaphragm is compressed and held between the divided surfaces by the fastening force of the fastener by attaching the fastener in a direction orthogonal to the divided surface.   The diaphragm pump according to claim 1, further comprising an annular locking groove for preventing a displacement of the fastener on an outer surface of the case.   The diaphragm pump according to claim 1 or 2, wherein the first frame and the second frame have the same shape.   Each of the dividing surfaces includes one or more fitting portions that prevent misalignment between the first frame and the second frame by being fitted to each other. Diaphragm pump according to the above. The diaphragm pump according to claim 4, wherein a plurality of fitting portions are arranged at equal intervals on each of the divided surfaces.

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