WO2016194951A1

WO2016194951A1 - Diaphragm pump

Info

Publication number: WO2016194951A1
Application number: PCT/JP2016/066192
Authority: WO
Inventors: 公輔宮城; 憲光濱尾
Original assignee: 株式会社Ibs
Priority date: 2015-06-01
Filing date: 2016-06-01
Publication date: 2016-12-08
Also published as: JP6625346B2; JP2016223370A

Abstract

A main pump 1 is provided with a first head holder 11, a second head holder 12, and a diaphragm 13 having a peripheral edge section 13a that is sandwiched between the first head holder 11 and the second head holder 12, wherein pressure in an internal space is altered and a fluid is transferred from an inflow port to an outflow port by the reciprocal motion of a middle section 13b of the diaphragm in the thickness direction. A sandwiching surface 111, which sandwiches the peripheral edge section 13a of the diaphragm in the first head holder 11, is provided with a first protrusion 112, a sandwiching surface 121, which sandwiches the peripheral edge section 13a of the diaphragm in the second head holder 12, is provided with a second protrusion 122, and the first protrusion 112 and the second protrusion 122 are disposed in positions offset from each other in the radial direction of the diaphragm 13.

Description

Diaphragm pump

The present invention relates to a diaphragm pump.

Conventionally, a diaphragm pump is known as a pump that applies pressure to a fluid in order to transfer the fluid. As shown in Patent Document 1, the diaphragm pump includes a first head holder, a second head holder provided in the first head holder, and a peripheral portion on the first head holder and the second head holder. And the central portion of the diaphragm reciprocates in the thickness direction, thereby changing the pressure in the internal space of the pump and transferring the fluid from the inlet to the outlet.

However, in this diaphragm pump, when the diaphragm reciprocates, the peripheral edge of the diaphragm is pulled to the center of the diaphragm and gradually moves inward in the radial direction, and the diaphragm may be displaced from the normal position.

On the other hand, Patent Document 2 discloses a diaphragm pump having a structure in which a protrusion is provided on the holding surface of the first head holder that holds the periphery of the diaphragm, and the periphery of the diaphragm is pressed by the protrusion. ing. According to this, since the movement of the diaphragm in the radial direction can be restricted by pressing the peripheral edge of the diaphragm with the protrusion, it is possible to prevent the diaphragm from shifting from the normal position.

Japanese Patent Application No. 2014-235219 JP 2013-119799 A

However, in the diaphragm pump of Patent Document 2, since the diaphragm swings around the protrusion during reciprocation, a slight gap is generated near the protrusion in the diaphragm, and the working fluid leaks from the inside of the pump. was there.

The present invention has been made in view of the above-described problem, and provides a diaphragm pump that can prevent the diaphragm from shifting from a normal position and can prevent the working fluid from leaking from the inside of the pump. The purpose is to provide.

In order to achieve the above object, the present invention provides a first head holder, a second head holder provided on the first head holder, and a peripheral portion on the first head holder and the second head holder. A diaphragm pump that moves the fluid from the inlet to the outlet by changing the pressure in the internal space of the pump by reciprocating the central portion of the diaphragm in the thickness direction. A first protrusion is provided on a holding surface for holding the peripheral edge of the diaphragm in the first head holder, and a second protrusion is provided on a holding surface for holding the peripheral edge of the diaphragm in the second head holder. The first protrusion and the second protrusion are disposed at positions shifted from each other in the radial direction of the diaphragm.

According to this, the first protrusion is provided on the clamping surface that clamps the peripheral edge of the diaphragm in the first head holder, and the first protrusion is provided on the clamping surface that clamps the peripheral edge of the diaphragm in the second head holder. Since the two protrusions are provided, the movement of the diaphragm in the radial direction can be restricted by pressing the peripheral edge of the diaphragm with each protrusion, and the diaphragm can be prevented from shifting from the normal position.

In addition, since the first protrusion and the second protrusion are disposed at positions shifted from each other in the radial direction of the diaphragm, the two protrusions having the peripheral edge of the diaphragm shifted in the radial direction of the diaphragm. Therefore, it is possible to prevent the working fluid from leaking from the inside of the pump.

Further, the first protrusion and the second protrusion are spaced apart from the first protrusion and the second protrusion, and are opposed to the first protrusion and / or the second protrusion, respectively. It is preferable that the head holder is arranged so that the distance between the head holder and the holding surface is the same. According to this, the compression ratio of the diaphragm between the first protrusion and the second protrusion, and the clamping surface of the head holder that faces the first protrusion and / or the second protrusion. Since the diaphragm compression ratio is the same, the diaphragm can be clamped in the radial direction with a uniform compression ratio, and the displacement of the diaphragm and the leakage of the working fluid can be more effectively prevented.

Further, it is preferable that at least one of the first protrusion and the second protrusion is formed in an annular shape over the entire circumference along the peripheral edge of the diaphragm. According to this, the diaphragm can be clamped in the circumferential direction with a uniform compression rate, and it becomes possible to prevent the displacement of the diaphragm and the leakage of the working fluid more effectively.

Further, it is preferable that at least one of the first protrusion and the second protrusion is formed in a semicircular cross section in the radial direction of the diaphragm. According to this, since the projecting portion having a semicircular cross section and the diaphragm come into surface contact with a gentle curved surface, wear and damage to the diaphragm can be reduced.

The first protrusion and the second protrusion are formed such that one protrusion is formed in a semicircular cross section in the radial direction of the diaphragm, and the other protrusion is a semicircle of one protrusion. It is preferable to have an inclined surface in contact with a large virtual circle centered on the center point. According to this, one projection and the diaphragm are in surface contact with a gentle curved surface, and the inclined surface of the other projection and the diaphragm are in plane contact with each other, so that wear and damage to the diaphragm can be reduced.

Further, the first protrusion and the second protrusion have a holding surface in which the other protrusion is connected to the top of the inclined surface and is parallel to the holding surface of the head holder on the one protrusion side. It is preferable to have. According to this configuration, the diaphragm can be stably clamped because the clamping surface of the head holder on one projection side and the clamping surface of the head holder on the other projection side are clamped in parallel.

Further, it is preferable that the first protrusion is disposed radially inward of the diaphragm with respect to the second protrusion, and the diaphragm is inclined toward the second head holder from the peripheral edge to the center. According to this, since the diaphragm is pressed against the second head holder side by the first protrusions arranged on the radially inner side, the diaphragm is inclined toward the second head holder side from the peripheral part to the center part. It becomes difficult to receive unnecessary external force in the thickness direction and can smoothly reciprocate.

According to the present invention, it is possible to restrict the movement of the diaphragm in the radial direction by pressing the peripheral edge of the diaphragm with each protrusion, and it is possible to prevent the diaphragm from deviating from the normal position.

Further, the peripheral edge of the diaphragm can be pressed with a radial width by two protrusions displaced in the radial direction of the diaphragm, so that there is no gap for the working fluid to ooze in the vicinity of each protrusion. It becomes possible to prevent the working fluid from leaking from the inside of the pump.

For this reason, the diaphragm can be prevented from deviating from the normal position, and the working fluid can be prevented from leaking from the inside of the pump, so that the diaphragm pump can be used stably over a long period of time. It becomes.

1 is a perspective view of a diaphragm pump according to the present invention. FIG. 2 is a sectional view taken along the line II-II of the diaphragm pump of FIG. 1. It is principal part sectional drawing of the III part of the diaphragm pump of FIG. It is principal part sectional drawing of the diaphragm pump which concerns on other embodiment.

Next, an embodiment of a diaphragm pump according to the present invention (hereinafter referred to as the present pump 1) will be described with reference to FIGS. *

The pump 11 is mounted on a U-shaped pump mount B as shown in FIG. 1, and is connected to a drive motor M similarly mounted on the pump mount B via a connecting rod R.

As shown in FIG. 2, the pump 1 includes a first head holder 11, a second head holder 12 provided in the first head holder 11, a first head holder 11, and a second head. A diaphragm 13 in which a peripheral edge portion 13a is sandwiched between holders 12, an inflow valve 14 for inflowing fluid, and an outflow valve 15 for outflowing fluid are provided.

The first head holder 11 is a disk-like member having a thickness provided at the upper part of the pump 1, and is provided with a recess 113 having a circular cross section at the center of the lower surface.

The first head holder 11 has a clamping surface 111 that clamps the peripheral edge portion 13a of the diaphragm 13 at the peripheral edge portion of the lower surface. As shown in FIG. 3, the sandwiching surface 111 is provided with a first protrusion 112 on the radially inner side of the diaphragm 13.

The first protrusion 112 is formed in a semicircular cross section in the radial direction of the diaphragm 13. For this reason, since the 1st projection part 112 and the diaphragm 13 surface-contact with a gentle curved surface, the abrasion and damage with respect to the diaphragm 13 can be reduced.

Further, the first protrusion 112 is formed in an annular shape over the entire circumference along the peripheral edge 13 a of the diaphragm 13. For this reason, the diaphragm 13 can be clamped with a uniform compression rate in the circumferential direction.

On the other hand, the second head holder 12 is an annular member having a thickness provided at the lower portion of the pump 1, and fixes the first head holder 11 and the peripheral portion 13 a of the diaphragm 13. . The second head holder 12 is provided with a screw groove in the peripheral edge portion of the upper surface, and the screw 16 is screwed into the screw groove in such a manner as to penetrate the first head holder 11 and the peripheral edge portion 13 of the diaphragm 13. The peripheral edge portion 13a of the diaphragm 13 with the first head holder 11 is fixed. In FIG. 3, 131 is provided as a part of the diaphragm between the peripheral portion 13 of the diaphragm 13 and the second head holder 12 in order to maintain the airtightness and liquid tightness inside the pump 1. It is a gasket.

The second head holder 12 has a clamping surface 121 for clamping the peripheral edge portion 13a of the diaphragm 13 on the upper surface. As shown in FIG. 3, the sandwiching surface 121 is provided with a second protrusion 122 on the outer side in the radial direction of the diaphragm 13 than the first protrusion 112, and the second protrusion 122 is a first protrusion. It has an inclined surface 122a in contact with a large virtual circle C centering on the center point O of the semicircle of the portion 112. For this reason, since the inclined surface 122a of the second protrusion 122 and the diaphragm 13 are in plane contact with each other, wear and damage to the diaphragm 13 can be reduced.

Further, the second protrusion 122 has a holding surface 122b that is connected to the top of the inclined surface 122a and is parallel to the holding surface 111 of the first head holder 11 of the first protrusion 112. For this reason, the diaphragm 13 can be stably clamped by the clamping surface 111 of the first head holder 11 and the clamping surface 122 of the second head holder 12.

Further, the second protrusion 122 is formed in an annular shape over the entire circumference along the peripheral edge 13 a of the diaphragm 13. For this reason, the diaphragm 13 can be clamped with a uniform compression rate in the circumferential direction.

The diaphragm 13 is a thin film-like member provided in an intermediate portion of the pump 1, and the peripheral edge portion 13 a is sandwiched between the first head holder 11 and the second head holder 12 as described above. As shown in FIG. 2, the diaphragm 13 is provided with a first head holder 11 on the upper side, an inner space having the concave portion 113 of the first head holder 11 as a top wall and a side wall, and the diaphragm 13 as a bottom wall. S is formed.

The diaphragm 13 has a central portion 13b connected to the connecting rod R. The connecting rod R converts the rotational motion of the drive motor M into a reciprocating motion in the vertical direction and transmits it to the central portion 13b of the diaphragm 13. Yes. Therefore, in the diaphragm 13, the central portion 13 b reciprocates in the thickness direction, changes the pressure in the internal space S, and transfers the fluid from the inlet 14 a of the inlet valve 14 to the outlet 15 a of the outlet valve 15. Specifically, when the central portion 13b of the diaphragm 13 moves downward, the volume of the internal space S increases, negative pressure is generated, and the fluid flows into the internal space S from the inlet 14a of the inflow valve 14. On the other hand, when the central portion 13b of the diaphragm 13 moves upward, the volume of the internal space S decreases and positive pressure is generated, and the fluid flows out from the internal space S to the outlet 15a of the outflow valve 15.

The inflow valve 14 is a pipe-shaped valve that allows a fluid to flow into the internal space S from the inflow port 14a, and includes a valve that prevents backflow from the internal space S to the inflow port 14a. For this reason, when the volume of the internal space S increases and negative pressure is generated, the fluid can surely flow into the internal space S from the inlet 14 a of the inflow valve 14. The above-mentioned outflow valve 15 is a pipe-shaped valve that allows a fluid to flow from the internal space S to the outflow port 15a, and has a valve that prevents backflow inside. For this reason, when the volume of the internal space S decreases and positive pressure is generated, the fluid can surely flow out from the internal space S to the outlet 15 a of the outflow valve 15.

Thus, the first protrusion 112 is provided on the clamping surface 111 that clamps the peripheral edge 13 a of the diaphragm 13 in the first head holder 11, and the peripheral edge 13 a of the diaphragm 13 in the second head holder 12. Since the second projection 122 is provided on the clamping surface 121 that clamps the diaphragm 13, the radial movement of the diaphragm 13 can be restricted by pressing the peripheral edge 13 a of the diaphragm 13 with the

projections

112, 122. It is possible to prevent deviation from the normal position.

Further, since the first protrusion 112 and the second protrusion 122 are arranged at positions shifted in the radial direction of the diaphragm 13, the peripheral edge portion 13 a of the diaphragm 13 is shifted in the radial direction of the diaphragm 13. The two

protrusions

112 and 122 can be pressed with a width in the radial direction, and it is difficult for gaps to occur near the

protrusions

112 and 122 in the diaphragm 13, so that the working fluid leaks from the inside of the pump. Can be prevented.

In the present embodiment, when the diaphragm 13 is sandwiched between the first head holder 11 and the second head holder 12, the separation distance L between the first protrusion 112 and the second protrusion 122, and the first The separation distance L1 between the protrusion 112 and the holding surface 121 of the second head holder 12 and the separation distance L2 between the second protrusion 122 and the holding surface 111 of the first head holder 11 are the same. A first protrusion 112 and a second protrusion 122 are disposed. For this reason, the compression ratio of the diaphragm between the first protrusion 112 and the second protrusion 122 and the compression of the diaphragm 13 between the first protrusion 112 and the clamping surface 121 of the second head holder 12. And the compression ratio of the diaphragm between the second protrusion 122 and the clamping surface 111 of the first head holder 11 are the same, so that the diaphragm 13 can be clamped at a uniform compression ratio in the radial direction. It is possible to prevent the displacement of the diaphragm 13 and the leakage of the working fluid more effectively.

The first protrusion 112 is disposed radially inward of the diaphragm 13 with respect to the second protrusion 122, and the diaphragm 13 is inclined toward the second head holder 12 from the peripheral edge 13a to the center 13b. ing. For this reason, the diaphragm 13 is pressed against the second head holder 12 side by the first protrusion 112 arranged radially inward, and is inclined toward the second head holder 12 side from the peripheral portion 13a to the center portion 13b. Therefore, the diaphragm 13 is less likely to receive unnecessary external force and can smoothly reciprocate.

In the present embodiment, only the first protrusion 112 is formed in a semicircular cross section, but as shown in FIG. 4, the second protrusion 122 is also formed in a semicircular cross section. Alternatively, only the second protrusion 122 may be formed in a semicircular cross section.

The first protrusion 112 and the second protrusion 122 have a semicircular cross section or an inclined surface 122a in contact with the virtual circle C, but are formed in other shapes. Also good.

In addition, although the first protrusion 112 and the second protrusion 122 are annularly formed over the entire circumference along the peripheral edge 13a of the diaphragm 13, a part of the circumferential direction is interrupted. It may be.

The first protrusion 112 is disposed on the radially inner side of the diaphragm 13 with respect to the second protrusion 122, but is disposed on the radially outer side of the diaphragm 13 with respect to the second protrusion 122. It may be arranged.

The first protrusion 112 and the second protrusion 122 are separated from each other by a distance L between the first protrusion 112 and the second protrusion 122, and the first protrusion 112 and the second protrusion. The

head holders

12 and 11 facing the portion 122 are arranged so as to be the same as the distances L1 and L2 between the holding

surfaces

121 and 111 of the

head holders

12 and 11, but the distance L is either the distance L1 or the distance L2. It may be arranged to be the same as one of the separation distances, or may be arranged to be another separation distance.

The embodiments of the present invention have been described above with reference to the drawings. However, the present invention is not limited to the illustrated embodiments. Various modifications and variations can be made to the illustrated embodiment within the same range or equivalent range as the present invention.

DESCRIPTION OF SYMBOLS 1 ... This pump 11 ... 1st head holder 111 ... Nipping surface 112 ... 1st projection part 113 ... Recessed part 12 ... 2nd head holder 121 ... Clamping surface 122 ... 2nd projection part 122a ... Inclined surface 122b ... Clamping Surface 13 ... Diaphragm 13a ... Peripheral part 13b ... Center part 14 ... Inflow valve 14a ... Inlet 15 ... Outlet valve 15a ... Outlet 16 ... Screw B ... Pump mount M ... Drive motor R ... Connecting rod S ... Internal space C ... Virtual circle

Claims

A first head holder; a second head holder provided in the first head holder; and a diaphragm having a peripheral edge sandwiched between the first head holder and the second head holder, and a central portion of the diaphragm Is a diaphragm pump that moves the fluid from the inlet to the outlet by changing the pressure in the internal space of the pump by reciprocating in the thickness direction,
A first protrusion is provided on a holding surface for holding the peripheral edge of the diaphragm in the first head holder, and a second protrusion is provided on a holding surface for holding the peripheral edge of the diaphragm in the second head holder. Provided,
The diaphragm pump, wherein the first protrusion and the second protrusion are arranged at positions shifted from each other in the radial direction of the diaphragm.
The first protrusion and the second protrusion are a distance between the first protrusion and the second protrusion, and a head facing the first protrusion and / or the second protrusion. The diaphragm pump of Claim 1 arrange | positioned so that the separation distance with the clamping surface of a holder may become the same.
2. The diaphragm pump according to claim 1, wherein at least one of the first protrusion and the second protrusion is formed in an annular shape over the entire circumference along a peripheral edge of the diaphragm.
The diaphragm pump according to claim 1, wherein at least one of the first protrusion and the second protrusion is formed in a semicircular cross section in the radial direction of the diaphragm.
The first protrusion and the second protrusion are such that one protrusion is formed in a semicircular cross section in the radial direction of the diaphragm, and the other protrusion is the center point of the semicircle of one protrusion. The diaphragm pump according to claim 1, wherein the diaphragm pump has an inclined surface in contact with a virtual circle having a large diameter centered at the center.
The first protrusion and the second protrusion have a holding surface in which the other protrusion is connected to the top of the inclined surface and parallel to the holding surface of the head holder on the one protrusion side. The diaphragm pump according to claim 5.
2. The first projecting portion according to claim 1, wherein the first projecting portion is disposed on a radially inner side of the diaphragm with respect to the second projecting portion, and the diaphragm is inclined toward the second head holder side from a peripheral portion to a center portion. Diaphragm pump.