JP2019027281A - Diaphragm Pump - Google Patents

Abstract

To provide a diaphragm pump capable of easily maintaining connections of diaphragm bodies with a rod member.SOLUTION: Claw parts 741 of diaphragm bodies 7A and 7B are locked to a reinforcement member 8, such that the reinforcement member 8 can be made hard to be detached when a center rod 6 reciprocally moves. Further, relative movements of a cylinder part 74 and the reinforcement member 8 in an X direction can be allowed. In a case where the reinforcement member 8 collides with a main body part 2 by the reciprocal movements of the center rod 6, damage of the claw parts 741 is suppressed and the reinforcement member 8 can be made hard to be detached from the cylinder part 74. Thus, the cylinder part 74 is made hard to be opened and deformed, and connections of the diaphragm bodies 7A and 7B with the center rod 6 can be easily maintained.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a diaphragm pump including a diaphragm-like diaphragm body that partitions a liquid feeding chamber and a working fluid chamber, a rod member connected to the diaphragm body, and a drive unit that reciprocally moves the rod member.

  In general, a diaphragm pump that discharges a fluid such as a liquid by dividing a fluid feeding chamber and a working fluid chamber by a diaphragm body and reciprocating a rod member connected to the diaphragm body is known. Such a diaphragm body has a membrane part that can be deformed by being constituted by a soft member. At this time, if the connecting portion of the diaphragm body with the rod member is formed of the same member as the membrane portion and the female screw portion is formed and screwed with the rod member, the connecting portion opens and deforms, and the rod member is detached. There was a case.

  Therefore, a diaphragm pump provided with a ring-shaped reinforcing member has been proposed in order to prevent the center rod (rod member) from coming off from the diaphragm body (see, for example, Patent Document 1). In the diaphragm pump described in Patent Document 1, the female thread portion of the diaphragm body and the male thread portion of the center rod are screwed together, and the tip of the center rod is inserted into the tubular portion of the diaphragm body. The reinforcing member is screwed to the outer peripheral portion of the portion. By providing the reinforcing member, the opening deformation of the cylindrical portion is suppressed, and thereby the opening of the female screw portion is also suppressed. Thus, the screwing of the male screw portion and the female screw portion is maintained.

JP 2003-172267 A

  However, in the diaphragm pump described in Patent Document 1, the thread on the outer periphery of the cylindrical portion of the soft diaphragm body may be scraped or deformed by the reciprocation of the center rod, and the reinforcing member is the diaphragm body. There was a case where I was disengaged. Therefore, it has been desired to make it easier to maintain the connection between the diaphragm body and the rod member by making it difficult for the reinforcing member to come off the diaphragm body.

  The objective of this invention is providing the diaphragm pump which can make it easy to maintain the connection of a diaphragm body and a rod member.

  The diaphragm pump of the present invention includes a diaphragm body that partitions a fluid feeding chamber and a working fluid chamber, a rod member that extends and is connected to intersect the diaphragm body, and a reciprocating movement of the rod member along the axial direction. A diaphragm pump comprising: a driving means for driving the diaphragm body, wherein the diaphragm body integrally includes a membrane portion that deforms as the rod member reciprocates and a connection portion to which an end portion of the rod member is connected. The connecting portion has a female screw portion on the inner peripheral surface and is screwed with the male screw portion of the end portion, and a cylindrical portion protruding to the rod member side while surrounding the concave portion, And an annular or C-shaped reinforcing member is provided so as to surround the outer periphery of the cylindrical portion, and the cylindrical portion has a claw portion that is locked to the reinforcing member by protruding toward the outer peripheral side. It is characterized by.

  According to the present invention as described above, it is possible to prevent the reinforcing member from being detached from the cylindrical portion by locking the claw portion of the cylindrical portion of the diaphragm body to the reinforcing member. At this time, the protrusion dimension of the claw part (the radial dimension of the opening of the reinforcing member) can be easily increased, and the reinforcing member can be made difficult to come off when the rod member reciprocates. Further, unlike the configuration in which the reinforcing member and the cylindrical portion are screwed together, the relative movement between the cylindrical portion and the reinforcing member in the reciprocating movement direction of the rod member can be allowed, and the reinforcing member becomes a peripheral member by the reciprocating movement of the rod member. This impact is unlikely to be transmitted to the cylinder portion when it collides with the cylinder. That is, it is difficult for a load due to a collision to be applied to the claw portion, to suppress damage to the claw portion, and to prevent the reinforcing member from being detached from the tube portion. As described above, since the reinforcing member is difficult to be removed from the cylindrical portion, the cylindrical portion is not easily opened and deformed, and the screwing between the internal threaded portion of the inner side and the male threaded portion of the rod member is difficult to be released. Can be easily maintained.

  In this case, in the diaphragm pump of the present invention, a tapered portion having a diameter that increases toward the tip side of the cylindrical portion is formed on at least one of the inner peripheral surface of the cylindrical portion and the outer peripheral surface of the end portion. The cylindrical portion is deformed radially outward by screwing the end portion and the female screw portion, and the inner peripheral surface of the opening of the reinforcing member and the outer peripheral surface of the rod member It is preferable to be sandwiched between the two. According to such a configuration, the cylindrical portion is sandwiched between the inner peripheral surface of the opening of the reinforcing member and the outer peripheral surface of the rod member, so that the cylindrical portion is not easily deformed by an external force generated when the rod member reciprocates. Therefore, the locking by the claw portion is difficult to be released.

  Further, in the diaphragm pump of the present invention, a step portion having a small diameter on the side into which the tube portion is inserted is formed on the inner peripheral surface of the opening portion of the reinforcing member, and the projecting dimension of the tube portion is the reinforcing member. It is preferable that it is below the dimension of the member in the insertion direction, and the claw portion is locked to the stepped portion. According to such a structure, a cylinder part does not protrude from the surface (surface on the side where a rod member is inserted) on the opposite side to the side into which a cylinder part is inserted among reinforcement members. Thereby, even if this opposite surface collides with the peripheral member due to the reciprocating movement of the rod member, the claw portion hardly collides with the peripheral member, and damage to the claw portion can be suppressed.

  According to the diaphragm pump of the present invention as described above, the connection between the diaphragm body and the rod member can be easily maintained by engaging the claw portion of the cylindrical portion of the diaphragm body with the annular reinforcing member. .

It is sectional drawing which shows the pump main body of the diaphragm pump which concerns on 1st Embodiment of this invention. It is a side view which shows the said pump main body. It is sectional drawing which shows the principal part of the said pump main body. It is a perspective view which shows the principal part of the said pump main body. It is sectional drawing which shows the principal part of the pump main body of the diaphragm pump which concerns on 2nd Embodiment of this invention. It is sectional drawing which shows the principal part of the pump main body of the diaphragm pump which concerns on the 1st modification of this invention. It is sectional drawing which shows the principal part of the pump main body of the diaphragm pump which concerns on the 2nd modification of this invention.

  Hereinafter, each embodiment of the present invention will be described with reference to the drawings. In the second embodiment, the same constituent members as those described in the first embodiment and the constituent members having similar functions are denoted by the same reference numerals as those in the first embodiment and the description thereof is omitted.

[First Embodiment]
The diaphragm pump 1 of the present embodiment includes a pump main body 10 shown in FIG. 1 and a switching device (not shown), and uses a gas such as air as a working fluid and discharges a fluid such as a liquid. The fluid discharged from the diaphragm pump 1 may be a gas. In the present embodiment, the reciprocating direction of the center rod 6 described later is defined as the X direction, and the two directions substantially orthogonal to the X direction are defined as the Y direction and the Z direction, respectively.

  The pump body 10 includes a body portion 2, a pair of casing members 3A and 3B, a suction side connecting member (manifold) 4, a discharge side connecting member (manifold) 5, a center rod 6 as a rod member, and a pair of Diaphragm bodies 7A and 7B.

  The main body 2 is a member disposed at the center in the X direction in the entire pump main body 10 and is configured by a metal member such as stainless steel, for example. The main body 2 has a through hole 21 that extends in the X direction and through which the center rod 6 is inserted, and recesses 22A and 22B formed on both sides in the X direction.

  The pair of casing members 3A and 3B are made of a metal member such as stainless steel, and are disposed so as to sandwich the main body 2 from the X direction. Each of the pair of casing members 3A and 3B includes a flow path portion 31 extending along the Z direction, and a concave portion 32 formed so as to face the concave portions 22A and 22B of the main body portion 2 on the inner side in the X direction. The flow path portion 31 and the concave portion 32 communicate with each other. A suction-side check valve 33 and a discharge-side check valve 34 are provided at both ends (the suction-side end portion and the discharge-side end portion) of the flow path portion 31, respectively.

  The suction-side connecting member 4 is a member that connects the suction-side end portions of the flow path portion 31 in the pair of casing members 3A and 3B, and is made of a metal member such as stainless steel. The suction side connecting member 4 has a flow path portion 41 extending along the X direction. The flow path portion 41 has a suction port 42 opened at one end thereof, and connection ports 43A and 43B connected to the suction side end portion of the flow path portion 31.

  The discharge-side connecting member 5 is a member that connects the discharge-side end portions of the flow path portion 31 in the pair of casing members 3A and 3B, and is made of a metal member such as stainless steel. The discharge side connecting member 5 has a flow path portion 51 extending along the X direction. The flow path portion 51 has a discharge port 52 opened at one end thereof, and connection ports 53A and 53B connected to the discharge side end portion of the flow path portion 31.

  The center rod 6 is formed in a rod shape (columnar or cylindrical shape) extending in the X direction as an axial direction by a metal member such as stainless steel, and is inserted into the through hole 21 of the main body 2. An O-ring is provided between the center rod 6 and the through hole 21 so that the recesses 22A and 22B do not communicate with each other. End portions 6A and 6B on both sides in the X direction of the center rod 6 are connected to diaphragm bodies 7A and 7B, respectively.

  The diaphragm bodies 7A and 7B extend along the YZ plane as a whole and are circular when viewed from the X direction. The diaphragm bodies 7A and 7B are disposed between the main body 2 and the pair of casing members 3A and 3B. Accordingly, the working fluid chambers 20A and 20B are formed by the recesses 22A and 22B and the diaphragm bodies 7A and 7B, respectively, and the fluid feeding chambers 30A and 30B are formed by the recess 32 and the diaphragm bodies 7A and 7B, respectively. That is, the diaphragm bodies 7A and 7B partition the working fluid chambers 20A and 20B and the fluid feeding chambers 30A and 30B.

  Here, the operation of the diaphragm pump 1 will be described. The working fluid is alternately supplied to the working fluid chambers 20A and 20B of the pump body 1 by the switching device. The working fluid is discharged from the working fluid chambers 20A and 20B to which the working fluid is not supplied. As a result, one of the pair of working fluid chambers 20A and 20B expands and the other contracts at the same time, and each working fluid chamber 20A and 20B repeats expansion and contraction.

  When the working fluid chambers 20A and 20B expand or contract, the diaphragm bodies 7A and 7B are deformed, and accordingly, the center rod 6 reciprocates in the X direction. That is, the switching device that supplies the working fluid functions as a driving unit.

  When the working fluid chambers 20A and 20B contract, the fluid feeding chambers 30A and 30B defined by the diaphragm bodies 7A and 7B expand and try to suck fluid. As a result, the suction-side check valve 33 is opened, and fluid is sucked from the suction port 42 via the flow path portion 41. When the working fluid chambers 20A and 20B expand, the fluid feeding chambers 30A and 30B defined by the diaphragm bodies 7A and 7B contract and try to discharge fluid. As a result, the discharge-side check valve 34 is opened, and fluid is discharged from the discharge port 52 through the flow path portion 51.

  Next, a detailed connection structure between the center rod 6 and the diaphragm bodies 7A and 7B will be described with reference to FIG. Hereinafter, the diaphragm body 7A on one side and the end portion 6A on one side of the center rod 6 will be described. The diaphragm body 7B on the other side and the end portion 6B on the other side of the center rod 6 have the same shape. Yes. Further, the dimensions of the respective parts described below are the dimensions in the natural state unless otherwise specified. The end portion 6A of the center rod 6 has a stepped portion 61 that is smaller in diameter than the center portion, and a male screw portion 62 is formed on the outer peripheral surface of the small diameter portion. A tapered portion 63 is formed in the large diameter portion of the end portion 6A so as to decrease in diameter toward the distal end side (that is, increase in diameter toward the distal end side of a cylindrical portion 74 described later of the diaphragm body 7A). ing.

  In the diaphragm body 7A, a film portion 71 that is deformed as the center rod 6 reciprocates and a connection portion 72 to which the end portions 6A and 6B of the center rod 6 are connected are integrally formed by the same member. . The members constituting the diaphragm body 7A are soft enough to deform the membrane portion 71, and have properties (oil resistance, chemical resistance, etc.) according to the fluid to be discharged, the working fluid, etc. Often, a resin such as a fluororesin or rubber is exemplified.

  The film portion 71 is formed in an annular shape so as to surround the connection portion 72, is bent convexly toward the outside (the side opposite to the main body portion 2), and its outer peripheral edge is formed by the main body portion 2 and the casing member 3A. It is pinched and fixed. As the connecting portion 72 moves as the center rod 6 reciprocates, the membrane portion 71 is deformed, and the volumes of the working fluid chamber 20A and the fluid feeding chamber 30A change as described above.

  The connecting portion 72 has a female screw portion 731 on the inner peripheral surface, and a concave portion 73 that is screwed with the male screw portion 62 of the center rod 6, and protrudes toward the center rod 6 side (main body portion 2 side) while surrounding the concave portion 73. A cylindrical portion 74.

  The recess 73 has a stepped portion 732 that opens to the main body 2 side and extends in the X direction, and has a large diameter on the opening side. A female screw portion 731 is formed on the small diameter portion of the inner peripheral surface of the recess 73, and the large diameter portion is formed flat along the X direction. The large diameter portion of the outer peripheral surface of the end portion 6 </ b> A of the center rod 6 contacts the large diameter portion of the inner peripheral surface of the recess 73. Further, the stepped surfaces along the YZ plane in the stepped portion 732 and the stepped portion 61 come into contact with each other from the X direction, and excessive insertion of the end portions 6A and 6B is restricted.

  The cylindrical portion 74 is formed in a cylindrical shape extending along the X direction, and a claw portion 741 protruding to the outer peripheral side is formed in the vicinity of the tip. In the present embodiment, as shown in FIG. 4, the claw portion 741 is formed over the entire circumference of the cylindrical portion 74 and is formed in an annular shape, but the claw portion is one of the entire circumference of the cylindrical portion. It may be formed only on the part. Moreover, you may make it easy to move a nail | claw part to radial inside by forming the slit which extends to a front-end | tip along a X direction in a cylinder part.

  The connecting portion 72 is provided with an annular reinforcing member 8 so as to surround the outer periphery of the cylindrical portion 74. Note that the reinforcing member may be formed in a C shape with a part cut away. The reinforcing member 8 only needs to be made of a member harder than the diaphragm body 7A, and may be made of a resin such as PP or PVC. Further, the reinforcing member 8 is provided on the inner surface 81 on the main body 2 side (the side where the center rod 6 is inserted), the outer surface 82 on the casing member 3A side (the side where the cylindrical portion 74 is inserted), and both sides in the X direction. And an opening 83 that is open. The opening 83 has a stepped portion 831 and is formed with a large diameter portion 832 on the main body portion 2 side and a small diameter portion 833 on the casing member 3A side. The step part 831 is formed on the main body part 2 side with respect to the step part 732 in the X direction.

  A claw portion 741 formed on the cylindrical portion 74 is locked to the step portion 831. Further, the protruding dimension (X direction dimension) of the cylindrical portion 74 is substantially equal to the insertion direction dimension (X direction dimension) of the reinforcing member 8. Therefore, the tip of the cylindrical portion 74 does not protrude from the inner surface 81 of the reinforcing member 8. The dimension in the insertion direction of the reinforcing member 8 means the maximum dimension (thickness) in the X direction, and the inner surface 81 of the reinforcing member 8 is inclined so that the dimension in the X direction on the center side becomes large. ing. Further, the inner surface 81 collides with the bottom surface of the recess 22A of the main body 2 when the working fluid chamber 20A contracts.

  The X direction dimension of the base part side of the claw part 741 in the cylindrical part 74 is substantially equal to or slightly larger than the X direction dimension of the small diameter part 833 of the reinforcing member 8. That is, the reinforcing member 8 may be able to move or rotate somewhat in the X direction with respect to the diaphragm body 7A. Further, the outer diameter of the cylindrical portion 74 on the proximal end side of the claw portion 741 is substantially equal to the inner diameter of the small diameter portion 833 of the reinforcing member 8. The X direction dimension of the tip part including the claw part 741 in the cylindrical part 74 is substantially equal to or slightly smaller than the X direction dimension of the large diameter part 832 of the reinforcing member 8. Further, the outer diameter of the claw portion 741 is larger than the inner diameter of the small diameter portion 833 of the reinforcing member 8 and slightly smaller than the inner diameter of the large diameter portion 832.

  The center rod 6 and the diaphragm body 7A are connected by the procedure described below. First, the cylindrical portion 74 of the diaphragm body 7A is inserted into the opening 83 of the reinforcing member 8 from the casing member 3A side toward the main body portion 2 side. At this time, when the claw portion 741 passes through the small diameter portion 833, the cylinder portion 74 is deformed so as to be reduced in diameter, and when the claw portion 741 reaches the large diameter portion 832, the cylinder portion 74 is restored and the claw portion is restored. 741 is locked to the step portion 831.

  Next, the end portion 6A of the center rod 6 is inserted into the recess 73, and the male screw portion 62 and the female screw portion 731 are screwed together. At this time, the outer diameter of the end portion 6 </ b> A of the center rod 6 is larger than the inner diameter of the portion on the distal end side of the stepped portion 732 of the cylindrical portion 74 on the proximal end side (large diameter side) of the tapered portion 63. On the distal end side (small diameter side) of the portion 63, the cylindrical portion 74 is smaller than the inner diameter of the distal end side portion of the stepped portion 732. Therefore, by screwing the male screw portion 62 and the female screw portion 731, the cylindrical portion 74 is deformed so as to be expanded in diameter (outward in the radial direction) and pressed against the inner peripheral surface of the opening 83. . That is, the cylindrical portion 74 is sandwiched between the outer peripheral surface of the end portion 6A and the inner peripheral surface of the opening 83 from the radial direction. The stepped surface of the stepped portion 61 and the stepped surface of the stepped portion 732 come into contact with each other, whereby the screwing of the male screw portion 62 and the female screw portion 731 is completed.

  According to this embodiment, there are the following effects. That is, it is possible to prevent the reinforcing member 8 from being detached from the cylindrical portion 74 by locking the claw portion 741 of the cylindrical portion 74 in the diaphragm bodies 7 </ b> A and 7 </ b> B to the reinforcing member 8. At this time, the protrusion dimension (diameter direction dimension) of the claw portion 741 can be easily increased, and the reinforcing member 8 can be hardly detached when the center rod 6 reciprocates. Further, unlike the configuration in which the reinforcing member and the cylindrical portion are screwed together, relative movement in the X direction between the cylindrical portion 74 and the reinforcing member 8 can be allowed. This impact is unlikely to be transmitted to the cylindrical portion 74 when it collides with 2. That is, it is difficult for a load due to a collision to be applied to the claw portion 741, to suppress damage to the claw portion 741, and to prevent the reinforcing member 8 from being detached from the cylindrical portion 74. As described above, since the reinforcing member 8 is difficult to be removed from the cylindrical portion 74, the cylindrical portion 74 is difficult to open and deform, and the internal thread portion 731 and the external thread portion 62 of the center rod 6 are hardly released. The connection between the diaphragm bodies 7A and 7B and the center rod 6 can be easily maintained.

  Further, after the cylindrical portion 74 is inserted into the opening 83 of the reinforcing member 8 and the claw portion 741 is locked, the center rod 6 is inserted into the concave portion 73 on the inner side of the cylindrical portion 74, thereby Inward deformation is suppressed, and the locking of the claw portion 741 is difficult to be released.

  Further, the end 6A of the center rod 6 has a tapered portion 63, and the cylindrical portion 74 is sandwiched between the inner peripheral surface of the opening 83 of the reinforcing member 8 and the outer peripheral surface of the end 6A. The cylindrical portion 74 is not easily deformed by the external force generated during the reciprocating movement 6, and the locking by the claw portion 741 is difficult to be released.

  Further, since the tip of the cylindrical portion 74 does not protrude from the inner surface 81 of the reinforcing member 8, even if the inner surface 81 of the reinforcing member 8 collides with the main body portion 2 due to the reciprocating movement of the center rod 6, the claw portion 741 is Damage to the claw portion 741 can be suppressed.

[Second Embodiment]
The diaphragm pump of the present embodiment is provided with a diaphragm body 7C and a reinforcing member 8B as shown in FIG. 5 in place of the diaphragm bodies 7A and 7B and the reinforcing member 8 in the diaphragm pump 1 of the first embodiment. .

  The diaphragm body 7C has a film part 71 and a connection part 72, and the connection part 72 has a concave part 73 and a cylindrical part 74B. Unlike the cylinder part 74 in 1st Embodiment, the cylinder part 74B does not have the nail | claw part 741, but has the external thread part 742 on the outer peripheral surface instead.

  A female screw portion 841 is formed on the inner peripheral surface of the opening 84 of the reinforcing member 8B. A step portion is not formed in the opening 84. When the male screw portion 742 and the female screw portion 841 are screwed together, the reinforcing member 8B is attached to the cylindrical portion 74B.

  In the present embodiment, similarly to the first embodiment, after the reinforcing member 8B is attached to the diaphragm body 7C, the end 6A of the center rod 6 is connected to the diaphragm body 7C. At this time, the end portion 6A has a tapered portion 63, the cylinder portion 74B is pressed against the inner peripheral surface of the opening portion 84 of the reinforcing member 8B, and the inner peripheral surface and the end portion of the opening portion 84 of the reinforcing member 8 It is sandwiched between the outer peripheral surface of 6A.

  According to this embodiment, there are the following effects. That is, when the cylindrical portion 74B is sandwiched between the inner peripheral surface of the opening 84 of the reinforcing member 8B and the outer peripheral surface of the end portion 6A, the screwing between the male screw portion 742 and the female screw portion 841 is difficult to be released. . Furthermore, the thread of the male threaded portion 742 is difficult to cut and damage can be suppressed. Accordingly, it is possible to make it difficult for the reinforcing member 8B to be detached from the cylindrical portion 74B, the cylindrical portion 74B is difficult to open and deform, the internal threaded portion 731 and the male threaded portion 62 inside thereof are not easily released, and the diaphragm body 7C And the connection with the center rod 6 can be easily maintained.

  The present invention has been described with reference to the embodiment. However, the present invention is not limited to the above-described embodiment, and includes other configurations that can achieve the object of the present invention. Are also included in the present invention.

  For example, in the first embodiment, the tapered portion 63 is formed at the end 6A of the center rod 6. However, as shown in FIG. 6 as a first modification, the tapered portion 63 is formed at the end 6A. In addition, a tapered portion 743 may be formed on the inner peripheral surface of the cylindrical portion 74C. Moreover, as shown in FIG. 7 as a 2nd modification, the taper part 743 may be formed only in the internal peripheral surface of the cylinder part 74C, without forming a taper part in the edge part 6A of the center rod 6. FIG. In any of the first and second modifications, the cylindrical portion is the opening of the reinforcing member 8 as in the first embodiment by making the maximum diameter of the end portion 6A larger than the inner diameter of the cylindrical portion 74C. Is sandwiched between the inner peripheral surface and the outer peripheral surface of the end portion 6A. Accordingly, the cylindrical portion 74C is not easily deformed by the external force generated by the reciprocating movement of the center rod 6, and the locking by the claw portion 741 is difficult to be released.

  Further, for example, the cylindrical portion is deformed when the wall of the cylindrical portion is formed to be sufficiently thick (the radial dimension is large) or the inner diameter of the cylindrical portion and the outer diameter of the end of the center rod are set to be approximately equal. In the case where it is difficult to do so, the tapered portion may not be formed on either the center rod or the cylindrical portion.

  Further, in the first embodiment, the reinforcing member 8 has the step portion 831 and the claw portion 741 is locked to the step portion 831. However, the step portion is not formed in the opening portion of the reinforcing member. The claw portion may be locked to the inner surface of the reinforcing member. At this time, the cylindrical portion protrudes from the inner surface of the reinforcing member. For example, the bottom surfaces of the concave portions 22A and 22B of the main body portion 2 may be appropriately formed in a concave shape so as to avoid collision with the claw portion.

  In the first embodiment, the center rod 6 and the diaphragm bodies 7A and 7B are connected in the diaphragm pump 1 including the pair of working fluid chambers 20A and 20B and the pair of fluid feeding chambers 30A and 30B. However, in a diaphragm pump provided with one working fluid chamber and a fluid feeding chamber, a similar rod member and a diaphragm body may be connected.

  In addition, the best configuration, method and the like for carrying out the present invention have been disclosed in the above description, but the present invention is not limited to this. That is, the invention has been illustrated and described primarily with respect to particular embodiments, but may be configured for the above-described embodiments without departing from the scope and spirit of the invention. Various modifications can be made by those skilled in the art in terms of materials, quantity, and other detailed configurations. Therefore, the description limiting the shape, material, etc. disclosed above is an example for easy understanding of the present invention, and does not limit the present invention. The description by the name of the member which remove | excluded the limitation of one part or all of such is included in this invention.

1 Diaphragm pump 6 Center rod (rod member)
6A, 6B End 63 Tapered portion 7A-7C Diaphragm body 71 Film portion 72 Connection portion 73 Recessed portion 731 Female screw portion 74 Tube portion 741 Claw portion 743 Tapered portion 8, 8B Reinforcement member 83 Opening portion 831 Step portion

The diaphragm pump of the present invention includes a diaphragm body that partitions a fluid feeding chamber and a working fluid chamber, a rod member that extends and is connected to intersect the diaphragm body, and a reciprocating movement of the rod member along the axial direction. A diaphragm pump comprising: a driving means for driving the diaphragm body, wherein the diaphragm body integrally includes a membrane portion that deforms as the rod member reciprocates and a connection portion to which an end portion of the rod member is connected. The connecting portion has a female screw portion on the inner peripheral surface and is screwed with the male screw portion of the end portion, and a cylindrical portion protruding to the rod member side while surrounding the concave portion, and having a circular or C-shaped reinforcing member is provided to surround the outer periphery of the tubular portion, the tubular portion may have a claw portion which is engaged with the reinforcing member by protruding the outer peripheral side The inside of the opening of the reinforcing member The surface is formed with a step portion having a small diameter on the side where the tube portion is inserted, and the protruding portion of the tube portion is less than or equal to the insertion direction size of the reinforcing member, and the claw portion is engaged with the step portion. It is stopped .

According to the present invention as described above, it is possible to prevent the reinforcing member from being detached from the cylindrical portion by locking the claw portion of the cylindrical portion of the diaphragm body to the reinforcing member. At this time, the protrusion dimension of the claw part (the radial dimension of the opening of the reinforcing member) can be easily increased, and the reinforcing member can be made difficult to come off when the rod member reciprocates. Further, unlike the configuration in which the reinforcing member and the cylindrical portion are screwed together, the relative movement between the cylindrical portion and the reinforcing member in the reciprocating movement direction of the rod member can be allowed, and the reinforcing member becomes a peripheral member by the reciprocating movement of the rod member. This impact is unlikely to be transmitted to the cylinder portion when it collides with the cylinder. That is, it is difficult for a load due to a collision to be applied to the claw portion, to suppress damage to the claw portion, and to prevent the reinforcing member from being detached from the tube portion. As described above, since the reinforcing member is difficult to be removed from the cylindrical portion, the cylindrical portion is not easily opened and deformed, and the screwing between the internal threaded portion of the inner side and the male threaded portion of the rod member is difficult to be released. Can be easily maintained. In addition, the cylindrical portion does not protrude from the surface of the reinforcing member opposite to the side where the cylindrical portion is inserted (the surface on the side where the rod member is inserted). Thereby, even if this opposite surface collides with the peripheral member due to the reciprocating movement of the rod member, the claw portion hardly collides with the peripheral member, and damage to the claw portion can be suppressed.

Claims (3)

A diaphragm body that partitions the fluid feeding chamber and the working fluid chamber; a rod member that extends and is connected to intersect the diaphragm body; and a drive unit that reciprocates the rod member along the axial direction. Diaphragm pump,
The diaphragm body integrally includes a membrane portion that deforms as the rod member reciprocates and a connection portion to which an end portion of the rod member is connected,
The connecting portion has a female screw portion on the inner peripheral surface and screwed with the male screw portion of the end portion, and a cylindrical portion protruding to the rod member side while surrounding the concave portion, An annular or C-shaped reinforcing member is provided so as to surround the outer periphery of the cylindrical portion,
The said cylinder part has a nail | claw part latched by the said reinforcement member by protruding to an outer peripheral side, The diaphragm pump characterized by the above-mentioned. At least one of the inner peripheral surface of the cylindrical portion and the outer peripheral surface of the end portion is formed with a tapered portion having a larger diameter toward the distal end side of the cylindrical portion,
By screwing the end portion and the female screw portion, the cylindrical portion is deformed radially outward, and the inner peripheral surface of the opening of the reinforcing member and the outer peripheral surface of the rod member The diaphragm pump according to claim 1, wherein the diaphragm pump is sandwiched between the two. On the inner peripheral surface of the opening of the reinforcing member, a step portion having a small diameter on the side where the cylindrical portion is inserted is formed,
3. The diaphragm pump according to claim 1, wherein the projecting dimension of the cylindrical part is equal to or less than a dimension in the insertion direction of the reinforcing member, and the claw part is locked to the stepped part.

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