JP6792153B2 - Diaphragm pump and material discharge device - Google Patents

Description

The present invention relates to a diaphragm pump and a material discharge device, and in particular, can prevent hardening of a viscous material in a pump chamber, and is used in a vertical posture in which the direction in which the diaphragm is displaced or vibrates is the vertical direction. The present invention relates to a diaphragm pump and a material discharge device suitable for use.

The diaphragm pump as a positive displacement pump displaces or vibrates the diaphragm in a direction substantially orthogonal to the surface via an appropriate driving means, and at the same time, defines valve mechanisms located on the material supply side and the material discharge side, respectively. By opening and closing at the timing of, the material is sucked into the pump chamber and discharged from the pump chamber to the outside.
As such a diaphragm pump, for example, Patent Documents 1 and 2 are described.

Japanese Unexamined Patent Publication No. 2006-342723 JP-A-2009-156253

The diaphragm pump described in Patent Document 1 has a configuration in which the diaphragm is displaced or vibrates in the left-right direction (lateral direction), and the pump is driven by fixing a housing plate to a separately provided vibrating machine. Therefore, the entire device including the diaphragm pump and the vibrating machine becomes long in the lateral direction and requires a wide arrangement space, which hinders the use in a narrow area and narrows the degree of freedom in the device layout. There is an inconvenience.
In such a case, as described in Patent Document 2, if the direction in which the diaphragm is displaced is the vertical direction (vertical direction), the diaphragm pump fits in the upper space of the material container, so that the diaphragm is displaced in the horizontal direction. The placement space can be reduced.
However, in the diaphragm pump described in Patent Document 2, for example, when a highly viscous material is targeted for suction and discharge, the diaphragm pump is derived from a container for storing the viscous material, or when the material is sucked. Due to cavitation, air is supplied to the pump chamber, causing a problem that air bubbles are retained in the pump chamber.
Therefore, when a moisture-curable viscous material is targeted for suction and discharge, there is a disadvantage that the viscous material undergoes a curing reaction in the pump due to air bubbles or air accumulated in the pump chamber.

Hardening of such a material makes it impossible to secure an appropriate displacement or vibration amount of the diaphragm, which not only hinders fixed quantity discharge, but also has a disadvantage that complicated maintenance including overhaul of the pump is frequently required. is there.

Further, in the diaphragm pump described in Patent Document 2, since the suction port and the discharge port of the material are configured to protrude from the lower part of the pump chamber, the suction port is formed in the upper opening of the storage bag filled with the viscous material. It is not suitable for a mode in which the diaphragm pump is placed so that the diaphragm pumps communicate with each other so that the diaphragm pump sinks into the storage bag as the material is consumed.
Even if such a usage mode can be achieved, it is necessary to discharge the material from above the diaphragm pump, so that it is necessary to connect a pipe to the discharge port and pull out the tip of the pipe upward. Therefore, not only the configuration becomes complicated, but also the pump cannot be miniaturized, and when the storage bag is stored in a storage container such as a pail can, a pipe passes between the inner surface of the pail can and the diaphragm pump. The existence of a gap is unavoidable, and the diaphragm pump cannot be used to smoothly lower the diaphragm pump using the inner surface of the pail as a guide surface.

[Purpose of Invention]
The present invention has been devised by paying attention to such inconveniences, and an object of the present invention is particularly when a viscous material is supplied to the pump chamber and discharged, and the viscous material entrains air bubbles into the pump chamber. An object of the present invention is to provide a pump and a material discharge device capable of discharging the bubbles together with a viscous material to the outside even if they are supplied so as to avoid staying in the pump chamber.

Another object of the present invention is to prevent the viscous material from being cured in the pump chamber, so that the volume in the pump chamber is not narrowed by the cured material, and quantitative discharge is realized. At the same time, it is to provide a pump that can be maintenance-free.

A further object of the present invention is to provide a diaphragm pump and a material discharge device suitable for use in a vertical posture so that the direction of displacement or vibration of the diaphragm is in the vertical direction.

Still another object of the present invention is to enable the discharge of materials from above the diaphragm pump in a state where the diaphragm pump is placed and connected so as to communicate with the opening of the storage container such as a storage bag or a pail can. An object of the present invention is to provide a material discharge device capable of smoothly descending with the inner surface of the storage container as a guide surface.

In order to achieve the above object, the present invention has adopted the configuration described in the claims. Specifically, the pump chamber forming member having the lower part open while the upper part is open, the diaphragm forming the pump chamber located on the open side of the pump chamber forming member, and the diaphragm being displaced in the vertical direction. It is provided with a driving means for causing the pump chamber, a first flow path communicating with the bottom surface to supply the viscous material into the pump chamber, and a second flow path communicating with the outer peripheral surface portion of the pump chamber to discharge the viscous material to the outside. In the diaphragm pump
A concave groove is formed on the bottom surface of the pump chamber forming member along the outer peripheral side.

In the diaphragm pump, the depth of the concave groove is preferably 1/2 or more of the vertical height of the lateral flow path of the second flow path. Here, the "depth of the concave groove" is used for the length from the bottom surface position of the pump chamber forming member to the bottom surface position of the concave groove. The " vertical height of the lateral flow path of the second flow path" refers to the vertical opening dimension of the horizontal flow path in FIG. 1.

Further, it is preferable that the depth of the pump chamber is more than twice and less than three times the depth of the concave groove. The depth of the pump chamber refers to the distance from the upper end of the pump chamber, that is, the surface position blocked by the diaphragm, to the bottom surface of the pump chamber, and does not include the depth of the concave groove.

Further, the lower end of the connecting portion between the second flow path and the outer peripheral surface portion is located on substantially the same surface as the bottom surface of the concave groove.

Further, the present invention includes a storage container for storing a viscous material, a diaphragm pump which is arranged so as to communicate with the upper opening of the storage container and can move along the inner surface of the storage container, and the diaphragm pump. In the material discharge device including the connected discharge device, the viscous material in the storage container is sucked and discharged from the discharge device.
The diaphragm pump has a pump chamber forming member having a lower surface as a bottom surface while opening the upper portion, a diaphragm located on the open side of the pump chamber forming member to form a pump chamber, and the diaphragm being displaced in the vertical direction. A driving means for causing the pump, a first flow path located between the central portion of the bottom surface and the storage container for sucking the viscous material into the pump chamber, and a discharge device communicating with the outer peripheral surface portion of the pump chamber. It is provided with a second flow path located between the pump chamber and flowing the viscous material toward the discharge device.
A concave groove is formed on the bottom surface of the pump chamber forming member along the outer peripheral side.
The second flow path is composed of a horizontal flow path connected to the outer peripheral surface portion of the pump chamber and a vertical flow path connected to the horizontal flow path.

When the viscous material is sucked and discharged into the pump chamber by the diaphragm pump, if it is taken into the pump chamber with air mixed due to some factor such as incomplete initial air purge, this is the upper part of the pump chamber. There is a risk of adverse effects such as staying on the outer peripheral side and curing the viscous material in the pump chamber.
According to the present invention, by forming the concave groove on the outer peripheral side of the bottom surface of the pump chamber forming member, the flow of the material can be promoted in the upper region of the concave groove, and the viscous material can be transferred from the upper portion on the outer peripheral side to the bottom surface of the concave groove. The viscous material flows by entraining air bubbles or air with the flow, and air is discharged to the outside of the pump room together with the viscous material discharged from the second flow path.
As a result, for example, even if the viscous material is a moisture-curable type, curing in the pump chamber can be prevented, the displacement operation of the diaphragm can always be kept stable, and the discharge or discharge amount of the material can be kept constant. ..

By setting the depth of the concave groove to ½ or more of the height of the second flow path, it becomes easy for the material to flow from the concave groove to the second flow path, and it becomes easy for air to flow at the same time. Further, the upper limit of the depth of the concave groove is preferably about 3/2.

Further, by making the depth of the pump chamber more than twice and less than three times the depth of the concave groove, it can be expected that the fluidity of the material of the entire pump chamber including the concave groove can be kept good.
By setting the depth of the concave groove and the depth of the pump chamber of the present invention within the above ranges, the range in which the viscous material stored in the pump chamber flows when the diaphragm moves up and down is sufficient to reach the upper end of the pump chamber. Will reach. Therefore, the bubbles staying at the upper end of the pump chamber are sent out by the flow of the viscous material, and the bubbles are less likely to remain.

Further, according to the configuration in which the lower end of the connection portion between the second flow path and the outer peripheral surface portion is located on substantially the same surface as the bottom surface of the concave groove, the risk of material staying in the concave groove can be avoided. Become.

It is the schematic sectional drawing of the material discharge device which concerns on embodiment of this invention. It is a top view of the pump chamber forming member. It is an enlarged view of the part A of FIG.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, in this specification, a term indicating a position or a direction shall be described with reference to FIG. 1 unless otherwise specified.

The material discharge device 10 according to the present embodiment includes a storage bag 11A for storing the viscous material M, and a substantially cylindrical pail 11B provided so as to be able to store the storage bag 11A and forming a storage container together with the storage bag 11A. In the pail 11B, the diaphragm pump 12 is located on the storage bag 11A and is arranged so as to communicate with the inside, and is connected to the upper opening of the storage bag 11A in a sealed state. It is composed of a discharge device 13 connected to the diaphragm pump 12. Examples of the viscous material M suitable in the present embodiment include a hydrolysis-curable modified silicone resin composition having a viscosity of about 100 Pa · s, a hydrolysis-curable silicone resin composition, and the like.

The diaphragm pump 12 has a substantially circular shape in a plan view and has an upper portion open, while a pump chamber forming member 16 having an internal space having a lower surface 15 and a position on the open side of the pump chamber forming member 16. A viscous material is located between the diaphragm 20 that forms the pump chamber 18 having a predetermined volume, the driving means 21 that displaces or vibrates the diaphragm 20 in the vertical direction, and the central portion of the bottom surface 15 and the storage bag 11A. The first flow path 23 that sucks M into the pump chamber 18 from the central portion communicates with the outer peripheral surface portion of the pump chamber 18, and is located between the discharge device 13 and the pump chamber 18 to discharge the viscous material M. It is configured to include a second flow path 25 for discharging to the 13 side. Here, a circular plate 17 having a diameter larger than that of the pump chamber forming member 16 and through which the first flow path 23 penetrates is located in the lower portion of the pump chamber forming member 16. The circular plate 17 is provided so as to descend so as to be substantially in contact with the inner surface of the pail 11B.

The pump chamber forming member 16 has a substantially cylindrical outer shape and generally has a stepped concave cross-sectional shape, and is separated from the bottom surface 15 by a predetermined distance, about 10 mm in the present embodiment. By arranging the diaphragm 20 at the position, a flat cylindrical pump chamber 18 is formed in the central portion. As shown in FIGS. 2 and 3, a concave groove 16A extending in a closed loop shape in the circumferential direction is formed on the bottom surface 15 along the outer peripheral side of the pump chamber forming member 16. The concave groove 16A has a width of about 8 mm and a depth of about 4 mm. The inner diameter of the pump chamber 18 is about 140 mm.

The diaphragm 20 is made of, for example, a material made of fluororubber such as polytetrafluoroethylene (PTFE) having a thickness of about 2 mm. The diaphragm 20 is sandwiched between the diaphragm 20 and the pump chamber forming member 16 by a ring-shaped intermediate block 27 located above the pump chamber forming member 16.

The first flow path 23 is configured by connecting a circular tubular pipe 28 to the central portion of the bottom surface of the pump chamber 18, and regulates the backflow of materials from the pump chamber 18 in the middle of the pipe 28. A check valve 29 is arranged.

The second flow path 25 is a lateral flow path 25A connected to the outer peripheral surface portion of the pump chamber 18 and a vertical flow path 25B connected to the horizontal flow path 25A so as to be located on the radial outer side of the pump chamber forming member 16. It is composed of and. The height of the lateral flow path 25A in the vertical direction in FIG. 1 is about 8 mm. Further, the lower end of the connection portion between the lateral flow path 25A and the pump chamber 18 is provided so as to be located on substantially the same surface as the bottom surface of the concave groove 16A. The vertical flow path 25B is linearly connected along the vertical direction in a state of vertically traversing the pump chamber forming member 16, the intermediate block 27, and the upper block 31 arranged above the intermediate block 27, whereby the pump chamber is formed. The viscous material M is sucked from below the pump chamber 18, and the viscous material M can be discharged from the discharge device 13 through the horizontal flow path 25A and the vertical flow path 25B connected to the outer peripheral side of the pump chamber 18. The discharge device 13 is connected to the vertical flow path 25B via a check valve (not shown).

The drive means 21 is provided between the plunger 35 arranged on the upper side of the upper block 31, the cylinder chamber 36 provided in the central portion of the intermediate block 27, and the cylinder chamber 36 and the plunger 35. The space C1 and the space C2 provided around the plunger 35, the pipes 40 and 41 that allow the hydraulic oil filled in the spaces C1 and C2 to communicate with each other, and a valve mechanism such as a relief valve (not shown) are provided. It is configured. The plunger 35 is connected to a known drive source such as an electric motor or a solenoid (not shown) via a coupling 39 provided at the upper end thereof. The pipe 40 constitutes a passage for flowing the hydraulic oil filled in the space C2 into the space C1, and the pipe 41 opens the relief valve when the space C1 exceeds the allowable pressure as the plunger 35 descends. A passage for allowing the hydraulic oil to escape is formed in the space C2. As a result, the quantitative suction and the quantitative discharge of the viscous material M are ensured with the displacement of the diaphragm 20 as a constant amount. Here, each end of the pipe 40 and the pipe 41 on the space C1 side is independently and separately connected to the space C1.

Next, the operation of the material discharge device 10 of the present embodiment will be described.

The operation of the material discharge device 10 in the present embodiment is achieved by repeatedly and continuously pressurizing and releasing the space C1 by advancing and retreating the plunger 35, that is, by descending and ascending operations, whereby the pump chamber 18 is operated. Pressurization and negative pressure are alternately generated in the pump chamber 18, and the material is sucked into the pump chamber 18 and the material is discharged from the pump chamber 18 to the discharge device 13 intermittently. That is, when the plunger 35 descends and applies pressure to the space C1, the diaphragm 20 is curved and displaced downward from the central portion, and the pump chamber 18 is pressurized. At this time, the check valve 29 on the first flow path 23 side is closed via a control device (not shown), while the check valve (not shown) on the vertical flow path 25B on the second flow path 25 side is opened. As a result, the viscous material M in the pump chamber 18 is discharged from the discharge device 13 via the horizontal flow path 25A and the vertical flow path 25B. On the other hand, when the plunger 35 rises and the space C1 is depressurized, the diaphragm 20 is curved and displaced upward from the central portion, and the pump chamber 18 becomes negative pressure. At this time, the check valve on the vertical flow path 25B side is closed via the control device, while the check valve 29 on the first flow path 23 side is opened. As a result, the viscous material M is sucked from the storage bag 11A into the pump chamber 18.
The viscous material M sucked into the pump chamber 18 through the first flow path 23 flows into the pump chamber 18 from the central portion of the bottom surface 15.
Here, when air is mixed in the viscous material M for some reason, conventionally, as shown in FIG. 3, the bubble b may stay in the upper part on the outer peripheral side of the pump chamber 18.
However, in the present embodiment, as shown by the arrow in FIG. 3, the bubble b flows into the concave groove 16A together with the viscous material M due to the flow from the central portion to the outer peripheral portion and the flow from the upper peripheral side to the lower portion. After that, it flows into the horizontal flow path 25A and is discharged from the discharge device 13 via the vertical flow path 25B. As a result, the inconvenience that air b stays in the pump chamber 18 is avoided. It is considered that this is because the diaphragm pump 12 according to the present invention connects the lateral flow path 25A to the concave groove 16A provided on the bottom surface along the outer peripheral side of the pump chamber forming member 16.
The diaphragm pump 12 sinks from the upper part of the storage bag 11A as the viscous material M is discharged, but the vertical flow forming the second flow path 25 in the plane of the pump chamber forming member 16. Since the path 25B is located and the viscous material M flows upward and is discharged from the discharge device 13, the flow of the viscous material M is not hindered even if it sinks on the storage bag 11A. Further, the diaphragm pump 12 descends along the inner surface of the pail 11B. Here, if the circular plate 17 is provided, the inner surface of the pail can can be lowered more smoothly.

Therefore, according to the present embodiment, when sucking and discharging the moisture-curable viscous material M, even if the material contains moist air, the bubbles are sucked into the pump chamber 18 It has the effect that it can be discharged without staying inside.
Further, the diaphragm pump 12 is provided so as to fit in the pail 11B, and even if it sinks on the storage bag 11A, the viscous material is circulated to the discharge device 13 from the upper part of the vertical flow path 25B. Therefore, it can be used as a vertical posture in which the surface of the diaphragm 20 is horizontal, and can be used as a space-saving type that does not take up a horizontal width. Further, by communicating one end side of the lateral flow path 25A with the outer peripheral surface portion of the pump chamber 18, the viscous material M sucked into the pump chamber 18 easily flows from the central portion of the bottom surface in the pump chamber 18. .. Moreover, the stagnation of air in the pump chamber can be easily eliminated by the configuration in which the viscous material M can be discharged from the discharge device 13 connected to the vertical flow path 25B connected to the horizontal flow path 25A.

As described above, the best configuration, method, etc. for carrying out the present invention are disclosed in the above description, but the present invention is not limited thereto.
That is, the present invention is mainly illustrated and described with respect to a specific embodiment, but without departing from the scope of the technical idea and purpose of the present invention, the shape, position, or the shape, position, or the above-described embodiment. Those skilled in the art can make various changes as necessary regarding the arrangement and the like.

For example, the viscous material M is not limited to the hydrolysis-curable silicone or the modified silicone resin composition, and is particularly preferably applied to trace components present in the air, particularly a material that cures by reacting with moisture. can do. Further, the viscous material M can be particularly preferably applied to a viscous material having a viscosity in the range of approximately 0.1 to 5000 Pa · s, preferably 1 to 1500 Pa · s, particularly preferably 5 to 500 Pa · s. it can.
Further, the structure of the diaphragm 20 is not limited to the above structure, and other diaphragms can be used.
Further, although the storage bag 11A and the pail can 11B are shown as the storage container, the present invention may be carried out by storing the material in the pail can 11B without using the storage bag 11A, and the storage container is limited to the pail can 11B. Instead, another container that can store the storage bag 11A may be used.
Furthermore, the dimensions or sizes of the above-mentioned members in the present invention are shown by way of example, and as long as they have the same effect, they do not prevent them from being changed.

10 Material discharge device 11A Storage bag 11B Pail can (storage container)
13 Discharge device 15 Bottom surface 16 Pump chamber forming member 16A Recessed groove 18 Pump chamber 21 Driving means 23 1st flow path 25 2nd flow path 25A Horizontal flow path 25B Vertical flow path b Bubbles (air)
M Viscous material

Claims (5)

A pump chamber forming member having the lower part open while opening the upper part, a diaphragm forming the pump chamber located on the open side of the pump chamber forming member, and a driving means for displaced the diaphragm in the vertical direction. In a diaphragm pump provided with a first flow path communicating with the bottom surface to supply a viscous material into a pump chamber and a second flow path communicating with an outer peripheral surface portion of the pump chamber to discharge the viscous material to the outside.
A diaphragm pump characterized in that a concave groove is formed on the bottom surface of the pump chamber forming member along the outer peripheral side. The diaphragm pump according to claim 1, wherein the depth of the concave groove is ½ or more of the vertical height of the lateral flow path of the second flow path. The diaphragm pump according to claim 1 or 2, wherein the depth of the pump chamber is more than twice and less than three times the depth of the concave groove. The diaphragm pump according to claim 1, 2 or 3, wherein the lower end of the connecting portion between the second flow path and the outer peripheral surface portion is located on substantially the same surface as the bottom surface of the concave groove. A storage container for storing a viscous material, a diaphragm pump arranged so as to communicate with the upper opening of the storage container and movable along the inner surface of the storage container, and a discharge device connected to the diaphragm pump. In the material discharge device including, the viscous material in the storage container is sucked and discharged from the discharge device.
The diaphragm pump has a pump chamber forming member having a lower surface as a bottom surface while opening the upper portion, a diaphragm located on the open side of the pump chamber forming member to form a pump chamber, and the diaphragm being displaced in the vertical direction. A driving means for causing the pump, a first flow path located between the central portion of the bottom surface and the storage container for sucking the viscous material into the pump chamber, and a discharge device communicating with the outer peripheral surface portion of the pump chamber. It is equipped with a second flow path located between the pump chamber and flowing the viscous material toward the discharge device.
A concave groove is formed on the bottom surface of the pump chamber forming member along the outer peripheral side.
The material discharge device is characterized in that the second flow path is composed of a lateral flow path connected to an outer peripheral surface portion of the pump chamber and a vertical flow path connected to the horizontal flow path.

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