JP6467280B2 - Diaphragm pump - Google Patents

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 is formed in the first frame, the first pin insertion hole formed in the first frame and having an axis passing through a plane parallel to a plane perpendicular to the dividing surface, and the second frame. In addition, the first pin insertion hole is a plurality of connecting portions including a second pin insertion hole adjacent in the length direction and a common fixing pin inserted into the first and second pin insertion holes. With
In addition, in the non-inserted state in which the diaphragm is arranged between the split surfaces and the fixing pin is not inserted into the first and second pin insertion holes, the center of the first pin insertion hole and the second pin The center of the pin insertion hole is separated in the thickness direction of the diaphragm,
In the inserted state in which the fixing pin is inserted into the first and second pin insertion holes, the first and second pin insertion holes are concentric, so that the peripheral portion of the diaphragm is separated between the divided surfaces. It is characterized by being compressed and held.

  In the diaphragm pump according to the present invention, it is preferable that the connecting portions are arranged at equal intervals.

In the diaphragm pump according to the present invention, the first frame has a first frame main body having the recess, and a plurality of first protrusions protruding from the outer peripheral surface of the first frame main body, While the first pin insertion hole is provided in one protrusion,
The second frame has a second frame main body having the recess, and a plurality of second protrusions protruding from the outer peripheral surface of the second frame main body, and the second pin is formed on each second protrusion. An insertion hole is preferably provided.

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

  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 including a plurality of connecting portions. It is connected.

  Each connecting portion is composed of first and second pin insertion holes formed in the first and second frames, respectively, and a common fixing pin inserted into both the first and second pin insertion holes. The In the non-insertion state in which the diaphragm is arranged between the divided surfaces and the fixing pin is not inserted, the center of the first pin insertion hole and the center of the second pin insertion hole are in the thickness direction of the diaphragm. While being separated, the first and second pin insertion holes are concentric in the inserted state. That is, by inserting the fixing pin, the diaphragm can be pressed in the thickness direction by an amount corresponding to the separation. As a result, the periphery 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 inserting a fixing pin, it is possible to improve the assembly workability and reduce the number of parts 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 non-insertion state of a fixing pin, (B) is a fragmentary sectional view which shows the diaphragm in an insertion state. 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 flat columnar shape and is divided into two equal parts by a dividing surface 5 passing through the center of its thickness. 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. . 2 and 5, the second frame 7 is indicated by a one-dot chain line, and the internal structure is shown through.

  The diaphragm 3 is formed of a well-known rubber elastic material that can be compressed and deformed, and its peripheral edge 3E is sandwiched between the dividing 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 of the diaphragm 3 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 arranged between the peripheral portion 3E and the main portion 3A. 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 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. 1 and 2, the first frame 6 includes a flat columnar first frame body 21 having the recess 8, and pipe connection is provided on the outer peripheral surface Sa of the first frame body 21. The nipple 10 protrudes. Similarly, the second frame 7 includes a flat columnar second frame body 31 having the concave portion 8, and a pipe connection nipple 10 projects from the outer peripheral surface Sb of the second frame body 31. . At the tip of each nipple 10, one end of a flow path 11 extending from each recess 8 opens. Each nipple 10 is preferably arranged in parallel with the dividing surface 5.

  As shown in FIG. 3, the first frame body 21 has a plurality of (for example, two in the present example) first protrusions 22 that protrude from the outer peripheral surface Sa. The first protrusion 22 has a joint surface 22S facing a second protrusion 32 of the second frame body 31 described later on one side in the circumferential direction. The joining surface 22 </ b> S of this example is configured in a radial direction perpendicular to the dividing surface 5 and passing through the axis i of the first frame body 21. The first protrusion 22 includes a raised portion 22 </ b> A that protrudes in the thickness direction beyond the dividing surface 5. In this example, the radially inner surface of the raised portion 22A constitutes an arcuate fitting surface 22As that fits with the outer peripheral surface Sb of the second frame body 31.

  Similarly, the second frame body 31 has a plurality of block-like second protrusions 32 protruding from the outer peripheral surface Sb, for example. The second protrusion 32 has a joint surface 32S facing the joint surface 22S on the other side in the circumferential direction. Similar to the bonding surface 22S, the bonding surface 32S of the present example is configured in a radial direction perpendicular to the dividing surface 5 and passing through the axis i. Further, the second protrusion 32 of this example includes a raised portion 32 </ b> A that protrudes in the thickness direction beyond the dividing surface 5. In this example, the radially inner surface of the raised portion 32A constitutes an arcuate fitting surface 32As that fits with the outer peripheral surface Sa of the first frame body 21.

  When the first and second protrusions 22 and 32 are temporarily assembled with the first and second frames 6 and 7, the fitting surfaces 22As and 32As are fitted to the outer peripheral surfaces Sa and Sb, respectively. By doing so, the first and second frames 6 and 7 can be concentrically connected to each other, and the joining surfaces 22S and 32S can be butted together and temporarily connected with high accuracy.

  Next, the connecting means 4 connects the first frame 6 and the second frame 7. The connecting means 4 includes a plurality (two in this example) of connecting portions 12.

  Each connecting portion 12 includes a first pin insertion hole 13 formed in the first frame 6, a second pin insertion hole 14 formed in the second frame 7, and the first and second pins. It is formed from a common fixing pin 15 that is inserted into the insertion holes 13 and 14 together. The first and second pin insertion holes 13, 14 are arranged adjacent to each other in the length direction while their respective axial centers pass through one surface parallel to a surface perpendicular to the dividing surface 5.

  In this example, the first pin insertion hole 13 is formed in the first protrusion 22, and the second pin insertion hole 14 is formed in the second protrusion 32.

  As shown in FIG. 4 (A), the non-inserted state Y1 in which the diaphragm 3 is arranged between the dividing surfaces 5 and 5 and the fixing pin 15 is not inserted into the first and second pin insertion holes 13 and 14. , The center 13j of the first pin insertion hole 13 and the center 14j of the second pin insertion hole 14 are separated by a distance L in the thickness direction of the diaphragm 3. On the other hand, as shown in FIG. 4B, in the inserted state Y2 in which the fixing pin 15 is inserted into the first and second pin insertion holes 13 and 14, the first and second pin insertion holes. 13 and 14 are concentric. That is, by inserting the fixing pin 15, the diaphragm 3 can be pressed in the thickness direction by the distance L. As a result, the peripheral edge portion 3E of the diaphragm 3 can be compressed and held between the divided surfaces 5 and 5, and fluid leakage can be suppressed.

  Further, since the connection between the first and second frames 6 and 7 can be performed only by inserting the fixing pin 15 without using many pairs of screws and nuts, the assembling workability can be improved. In addition, the number of parts for connection can be reduced, and the cost can be reduced.

  In addition, it is preferable to arrange | position the connection part 12 at equal intervals around the shaft center i, and, thereby, the peripheral part 3E can be compressed uniformly. It is also preferable to form the first frame 6 and the second frame 7 in the same shape. In this case, the first and second frames 6 and 7 can be manufactured using the same mold, and the manufacturing cost can be further reduced.

  FIG. 5 shows another embodiment of the connecting means 4. In this example, the connecting means 4 is formed by three connecting portions 12 arranged at equal intervals in the circumferential direction.

  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. For example, the case 2 may be formed in a rectangular shape, and may be modified in various ways. 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 Connection part 13 1st pin insertion hole 13j Center 14 2nd pin insertion hole 14j Center 15 Fixing pin 21 1st frame main body 22 1st protrusion 31 2nd frame main body 32 2nd protrusion H Space Sa, Sb Outer peripheral surface Y1 Non-insertion state Y2 Insertion state

Claims (4)

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 is formed in the first frame, the first pin insertion hole formed in the first frame and having an axis passing through a plane parallel to a plane perpendicular to the dividing surface, and the second frame. In addition, the first pin insertion hole is a plurality of connecting portions including a second pin insertion hole adjacent in the length direction and a common fixing pin inserted into the first and second pin insertion holes. With
In addition, in the non-inserted state in which the diaphragm is arranged between the split surfaces and the fixing pin is not inserted into the first and second pin insertion holes, the center of the first pin insertion hole and the second pin The center of the pin insertion hole is separated in the thickness direction of the diaphragm,
In the inserted state in which the fixing pin is inserted into the first and second pin insertion holes, the first and second pin insertion holes are concentric, so that the peripheral portion of the diaphragm is separated between the divided surfaces. A diaphragm pump characterized by being compressed and held.   The diaphragm pump according to claim 1, wherein the connecting parts are arranged at equal intervals. The first frame has a first frame main body having the recess and a plurality of first protrusions protruding from an outer peripheral surface of the first frame main body, and the first pin is formed on each first protrusion. An insertion hole is provided,
The second frame has a second frame main body having the recess, and a plurality of second protrusions protruding from the outer peripheral surface of the second frame main body, and the second pin is formed on each second protrusion. The diaphragm pump according to claim 1, wherein an insertion hole is provided.   The diaphragm pump according to any one of claims 1 to 3, wherein the first frame and the second frame have the same shape.

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