JP2004239101A - Diaphragm pump - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To remove adverse influence on a device body attached with a diaphragm pump. <P>SOLUTION: A suction port 11 and a delivery port 12 are arranged in a cover body 13. When a diaphragm part 6 descends, a first valve element 8 opens, fluid flows in a pump room 5 by passing through an intake space 59 and an intake passage 43 from the suction port 11. When the diaphragm part 6 rises, a second valve element 9 opens, and the fluid in the pump room 5 is delivered from the delivery port 12 by passing through an exhaust passage 42 and a delivery space 58. A housing 4 for housing a driving body 3 is composed of a diaphragm holder 14 and a bottom plate 15. A sealant 5 for sealing a part between the inside and the outside of the housing 4 is interposed between the diaphragm holder 14 and the bottom plate 15. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a diaphragm pump suitable for supplying a liquid and a diaphragm pump which can be used for both a pressurizing pump and a suction pump.
[0002]
[Prior art]
Conventional diaphragm pumps for supplying liquid include a suction port for supplying liquid to a pump chamber via a suction passage, and a discharge port for discharging liquid exhausted from the pump chamber via a discharge passage. (For example, see Patent Document 1).
[0003]
In addition, the applicant has not found a prior art document closely related to the present invention by the time of filing, except for the prior art document specified by the prior art document information described in the present specification. .
[0004]
[Patent Document 1]
Japanese Patent Application No. 2002-10056 (paragraph 0020, FIG. 1)
[0005]
[Problems to be solved by the invention]
In the above-described conventional diaphragm pump, when a crack is generated in the diaphragm for some reason, the liquid flows into the case from the crack and leaks to the outside of the case from a butt surface of the case or a screw hole. For this reason, there has been a problem that the liquid also flows into the apparatus main body to which the diaphragm pump is mounted, which adversely affects the apparatus itself. In particular, damage is increased when an electronic circuit is incorporated in a device in which a diaphragm pump is used.
[0006]
The present invention has been made in view of the above-described conventional problems, and an object of the present invention is to eliminate an adverse effect on an apparatus main body to which a diaphragm pump is mounted.
[0007]
[Means for Solving the Problems]
In order to achieve this object, an invention according to claim 1 includes a diaphragm having a plurality of diaphragm portions forming a pump chamber, and a driving body that expands and contracts the pump chamber by vertically moving each of the diaphragm portions of the diaphragm. A housing for accommodating the driving body, a suction passage and a discharge passage corresponding to each of the pump chambers, a first valve body for preventing a flow from the pump chamber to the suction passage, A diaphragm pump comprising: a second valve body for preventing flow to a pump chamber; and a lid having a suction port communicating with the suction passage and a discharge port communicating with the discharge passage. And a sealing material for hermetically sealing between the inside and the housing.
Therefore, even if the liquid flows into the housing due to the crack in the diaphragm, the liquid does not leak out of the housing due to the sealing material.
[0008]
The invention according to claim 2 is the invention according to claim 1, wherein the housing is constituted by a cap-shaped diaphragm holder having one opening and a bottom plate that closes an opening of the diaphragm holder, and the sealing material is formed. The diaphragm holder is held between the opening end of the diaphragm holder and the bottom plate.
Therefore, a contact portion between the opening end of the diaphragm holder and the bottom plate and a hole provided in the bottom plate are sealed by the sealing material.
[0009]
According to a third aspect of the present invention, in the first aspect of the present invention, the housing includes a cap-shaped diaphragm holder having one opening and a case having a bottomed cylindrical shape that closes an opening of the diaphragm holder. The sealing material is formed in a cylindrical shape with a bottom that seals the bottom of the case and the contact portion between the diaphragm holder and the case, and the sealing material is sandwiched between a seal retainer, the case, and the diaphragm holder. It was done.
Therefore, the abutting portion between the diaphragm holder and the case and the hole provided in the bottom of the case are hermetically sealed by the sealing material.
[0010]
The invention according to claim 4 is the invention according to claims 1 to 3, wherein the suction port and the inside of the housing are communicated.
Therefore, when the pump is operated by connecting the member to be suctioned to the suction port, the inside of the housing is also in a negative pressure state, and the pressure in the housing does not become larger than the pressure in the pump chamber.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a sectional view of a diaphragm pump according to a first embodiment of the present invention, FIG. 2 shows the same sealing material, FIG. 1 (a) is a plan view, and FIG. FIG. 2 is a sectional view taken along line II (b) -II (b).
Incidentally, `` up, down '' used to describe the direction in the specification is a description of the direction in the figure to the last, and when the diaphragm pump according to the present invention is actually used, It does not always coincide with the downward direction.
[0012]
As shown in FIG. 1, a diaphragm pump generally designated by reference numeral 1 includes a motor 2 serving as a driving source, a housing 4 to which the motor 2 is attached and which accommodates a driving body 3, and a pump chamber 5 which forms each pump chamber 5. A diaphragm 7 having two diaphragm portions 6, a valve holder 10 to which a first valve body 8 and a second valve body 9 are attached, and a lid 13 having an intake port 11 and a discharge port 12.
[0013]
The housing 4 is composed of a diaphragm holder 14 that is open at the bottom and is formed in a substantially cap shape, and a bottom plate 15 that closes the opening of the diaphragm holder 14. A motor mounting port 16 is drilled in the center of the bottom plate 15, and two screw insertion holes 17 are drilled so as to sandwich the motor mounting port 16. The motor 2 is fixed to the bottom plate 15 by screws 19 inserted through screw insertion holes 17, and a motor shaft 18 faces the inside of the housing 4 from a motor mounting port 16 of the bottom plate 15.
[0014]
The crank base denoted by reference numeral 21 in FIG. 1 is formed in a substantially small columnar shape, and is provided with a shaft hole 22 to which the motor shaft 18 is fixed at the center, and at a position eccentric from the axis of the shaft hole 22. And the drive shaft 23 is fixed in an inclined state.
[0015]
The driving body 3 is formed by a boss 25 provided with a shaft hole 24 into which the driving shaft 23 is rotatably inserted, and a main body 26 integrally formed at an upper end of the boss 25. The main body 26 is formed in series by three drivers 27 extending radially from the center at equal angles in the circumferential direction in plan view, and these three drivers 27 are all arranged from the center toward the tip. It is inclined downward by the same angle, and a mounting hole 28 for mounting each diaphragm 6 is provided at the tip end of each driver 27.
[0016]
In the ceiling portion 30 of the diaphragm holder 14, three diaphragm portion holding holes 31 for holding the respective diaphragm portions 6 are provided at equal angles in the circumferential direction.
[0017]
The diaphragm 7 is formed of a flexible material such as rubber, and has three diaphragm portions 6 that are open at the top and are provided at equal angles in the circumferential direction in plan view. A piston 32 having a substantially frustoconical cross section is integrally formed on the lower surface of each diaphragm portion 6, and a convex portion 34 for locking is integrally formed on the lower surface of the piston 32 via a small-diameter neck portion 33. Is formed.
[0018]
The first valve body 8 is formed in an umbrella shape using a flexible material such as rubber. The second valve element 9 is formed of a flexible material such as rubber into a substantially flat plate shape, and a raised portion 37 is integrally provided at an upper central portion. An engagement recess 38 that fits into an engagement projection 40 described later of the holder 10 is formed. On the upper side of the second valve body 9, three ribs 39 are provided protruding at equal angles in the circumferential direction.
[0019]
The valve holder 10 is formed in a cylindrical shape with a shallow bottom, and an engaging projection 40 covering the second valve body 9 is integrally provided at a central portion on the upper side of the bottom. Around the engagement projection 40, a partition wall 41 formed in an annular shape in plan view is integrally provided upright. The valve holder 10 is provided with three sets of a discharge passage 42 and a suction passage 43 at equal angles in the circumferential direction. The discharge passage 42 is positioned closer to the center of the valve holder 10 than the suction passage 43. A first valve body mounting hole 44 is provided near the suction passage 43.
[0020]
The lid 13 is formed in a substantially cap shape with a low ceiling, and a cylindrical portion 46 is integrally erected at a central portion on the surface side of the ceiling portion 45, and an opening end of a hollow portion of the cylindrical portion 46 will be described later. The discharge port 12 is formed so as to communicate with the discharge space 58. A cylindrical portion 47 is integrally erected at a peripheral end on the surface side of the ceiling portion 45, and an open end of a hollow portion of the cylindrical portion 47 communicates with a suction space 59 described later to form the suction port 11.
[0021]
An annular pressing portion 48 is projected from a central portion on the back surface side of the ceiling portion 45 so as to surround the cylindrical portion 46, and an annular engaging ridge is provided around the pressing portion 48. An engagement groove 50 is formed in the lower surface of the engagement ridge 49.
[0022]
The sealing material indicated by reference numeral 52 in FIG. 1 is made of a flexible material such as rubber, and is formed in a substantially disc shape as shown in FIG. The shaft seal portion 54 is integrally provided upright. The inner diameter of the upper end of the shaft seal portion 54 is formed slightly smaller than the outer diameter of the motor shaft 18 of the motor 2.
[0023]
Two bulging portions 55 each having a circular arc-shaped cross section that covers the head of the screw 19 are integrally protruded from the sealing material 52 so as to sandwich the shaft sealing portion 54. On the peripheral edge portion on the side, a protruding ridge body 56 formed in an annular shape in plan view is integrally provided upright.
[0024]
In such a configuration, as shown in FIG. 1, the shaft seal portion 54 of the sealing material 52 is engaged with the motor shaft 18 before the shaft hole 22 of the crank base 21 is axially mounted on the motor shaft 18 of the motor 2. The sealing material 52 is placed on the surface of the bottom plate 15 so that the head of the screw 19 is covered by the bulging portion 55. The shaft hole 22 of the crankshaft 21 is axially mounted on the motor shaft 18, and the drive shaft 23 is fixed at a position eccentric from the axis of the shaft hole 22 of the crankshaft 21 in an inclined state.
[0025]
Each diaphragm part 6 of the diaphragm 7 is inserted into each of the diaphragm part holding holes 31 of the diaphragm holder 14. While elastically deforming the locking projections 34 of each of the diaphragm portions 6, each of the diaphragm portions 6 is press-fitted into each of the mounting holes 28 of the driving body 3 and the neck 33 is locked in the mounting hole 28, so that each of the diaphragm portions 6 is driven by the driving body 3 To each driver 27.
[0026]
The driving body 3 is rotatably supported by the driving shaft 23 by inserting the ball 57 and the driving shaft 23 into the shaft hole 24 of the driving body 3. The diaphragm holder 14 is placed on the bottom plate 15, and a portion of the seal member 52 at which the convex strip 56 is provided is sandwiched between the diaphragm holder 14 and the bottom plate 15 by assembling described later.
[0027]
By covering the second valve body 9 on the engaging projection 40 of the valve holder 10, the space between the discharge passage 42 and the discharge space 58 is closed by the second valve body 9. Further, by attaching the first valve body 8 to the first valve body attachment hole 44 of the valve holder 10, the space between the suction passage 43 and the pump chamber 5 is closed by the first valve body 8.
[0028]
The valve holder 10 to which the first and second valve bodies 8 and 9 are attached is mounted on a diaphragm holder 14, and the diaphragm 7 is sandwiched between the valve holder 10 and the diaphragm holder 14 by an assembly described later. You.
[0029]
When the lid 13 is placed on the valve holder 10, the pressing portion 48 presses the rib 39 of the second valve body 9, and the second valve body 9 comes into close contact with the upper surface of the valve holder 10. At the same time, the upper end of the partition wall 41 of the valve holder 10 is engaged with the engagement groove 50 of the engagement ridge 49, and the space formed by the valve holder 10 and the lid 13 by the partition wall 41 is centered. The suction space 59 is divided into a discharge space 58 located on the side and a suction space 59 located on the outer peripheral side and formed in a substantially annular shape. The upper end of the partition wall 41 of the valve holder 10 and the engagement groove 50 of the engagement ridge 49 are joined by welding or the like, and the upper end of the outer periphery of the valve holder 10 and the lower end of the outer periphery of the lid 13 are welded. Thus, the space between the suction space 59 and the outside is sealed.
[0030]
The liquid pumped to the discharge space 58 is discharged from the discharge port 12 of the lid 13 to the outside. Further, three pump chambers 5 are formed by the valve holder 10 and the respective diaphragm portions 6 of the diaphragm 7.
[0031]
Further, the first valve element 8 closes the space between the suction passage 43 and the pump chamber 5 by being in close contact with the lower surface of the valve holder 10, so that the liquid flows out from the pump chamber 5 to the suction passage 43. Functions as a restricting check valve. Further, the second valve element 9 closes the space between the discharge passage 42 and the discharge space 58 by being in close contact with the upper surface of the valve holder 10, so that the liquid flows from the discharge space 58 through the discharge passage 42 to the pump chamber 5. Functions as a check valve that regulates the flow to the
[0032]
The diaphragm pump 1 is formed by integrating the lid 13, the valve holder 10, the diaphragm holder 14, and the bottom plate 15 by a leaf spring or a rod-shaped (linear) spring (not shown).
[0033]
In the diaphragm pump 1 thus formed, the ridges 56 of the sealing material 52 are elastically deformed by being sandwiched between the diaphragm holder 14 and the bottom plate 15, and are brought into close contact with the diaphragm holder 14 and the bottom plate 15. I do. Therefore, the inside of the housing 4 and the outside at the contact portion between the diaphragm holder 14 and the bottom plate 15 are sealed by the sealing material 52.
[0034]
Since the head of the screw 19 is covered by the bulging portion 55 of the sealing material 52, the sealing material 52 seals the space between the inside and the outside of the housing 4 in the screw insertion hole 17. At the same time, since the inner diameter of the upper end of the shaft seal portion 54 of the sealing material 52 is formed slightly smaller than the outer diameter of the motor shaft 18, the upper end portion of the shaft seal portion 54 comes into close contact with the outer peripheral surface of the motor shaft 18. Thus, the seal material 52 seals the space between the inside and the outside of the housing 4 at the motor mounting opening 16.
[0035]
That is, the inside of the housing 4 is sealed off from the outside by the sealing material 52 provided inside the housing 4.
[0036]
Next, the operation of the diaphragm pump 1 having such a structure will be described with reference to FIG.
When the motor 2 is driven and the motor shaft 18 is rotated, the crankshaft 21 is also integrally rotated, and the drive shaft 23 is fixed to the crankshaft 21 at a position eccentric from the axis of the shaft hole 22. The eccentric rotation is performed around the shaft 18 so as to change the inclination direction.
[0037]
Therefore, each driver 27 of the driving body 3 rotatably supported by the drive shaft 23 sequentially swings up and down, and each diaphragm portion 6 of the diaphragm 7 also swings up and down sequentially. Sequentially expand and contract to perform a pump action.
[0038]
That is, when one of the three diaphragm portions 6 of the diaphragm 7 descends, the pump chamber 5 expands, and the pump chamber 5 enters a negative pressure state. At this time, the second valve element 9 functions as a check valve that regulates the flow of the liquid from the discharge space 58 to the pump chamber 5 through the discharge path 42, so that the second valve element 42 controls the discharge path by the second valve element 42. 42 is closed.
[0039]
On the other hand, the first valve body 8 elastically deforms downward in the figure to open the space between the suction passage 43 and the pump chamber 5, and thus flows into the suction space 59 from the suction port 11 of the lid 13. The liquid flows into the expanded pump chamber 5 through the suction passage 43.
[0040]
When the motor shaft 18 of the motor 2 further rotates and the diaphragm portion 6 of the expanded pump chamber 5 rises, the pump chamber 5 contracts, so that the pressure of the liquid in the pump chamber 5 increases. At this time, the first valve body 8 functions as a check valve that prevents the liquid from flowing from the pump chamber 5 through the suction passage 43 to the suction space 59. 5 and the suction passage 43 are closed.
[0041]
On the other hand, the second valve body 9 is elastically deformed upward in the figure to open the space between the discharge passage 42 and the discharge space 58, so that the liquid in the pump chamber 5 passes through the discharge passage 42 and the discharge space 58. And is discharged from the discharge port 12.
[0042]
Since the expansion and contraction operation of the pump chamber 5 is performed sequentially and continuously in each pump chamber 5, the liquid discharged from each discharge path 42 to the discharge space 58 is collected by the lid 13 and is discharged from one discharge port 12. Dispensed continuously.
[0043]
Here, even if a crack or the like is generated in the diaphragm 6 during the operation of the diaphragm pump 1 and the liquid flows into the housing 4 from the crack, the gap between the inside and the outside of the housing 4 is maintained by the sealing material 52. Is kept in a sealed state, so that the liquid is prevented from flowing out of the housing 4. Therefore, there is no adverse effect on the apparatus main body on which the diaphragm pump 1 is mounted.
[0044]
3 to 6 show a second embodiment of the present invention. FIG. 3 is a sectional view of a diaphragm pump, FIG. 4 shows a sealing material, FIG. 3 (a) is a plan view, and FIG. FIG. 5A is a sectional view taken along the line IV (b) -IV (b), FIG. 5 shows a seal holder, FIG. 5A is a plan view, and FIG. 6 (a) is a bottom view, and FIG. 6 (b) is a VI (b) -VI (b) line in FIG. 6 (a). It is sectional drawing. In these drawings, the same or equivalent members described in the first embodiment shown in FIGS. 1 and 2 described above are denoted by the same reference numerals, and detailed description is omitted as appropriate.
[0045]
The second embodiment differs from the above-described first embodiment in that a case 115 is used as a member constituting the housing 104, and that the suction port 11 and the inside of the housing 104 are provided with ventilation ports 111 and 108. , 117 and the point that the fluid used is a gas.
[0046]
That is, the housing 104 is constituted by a cap-shaped diaphragm holder 114 having an open bottom, and a bottomed cylindrical case 115 for closing the opening of the diaphragm holder 114. As shown in FIG. 6, three engagement ribs 118 project inwardly at an equal angle in the circumferential direction so as to be located between the respective diaphragm portion holding holes 31 inside the cylindrical portion 116 of the diaphragm holder 114, as shown in FIG. Is established.
[0047]
These engagement ribs 118 extend in the up-down direction of the cylindrical portion 116, and are provided such that the lower ends thereof are located above the open ends 116a of the cylindrical portions 116, and the lower ends form the engaging portions 119. . A vent 117 is formed in the peripheral end of the ceiling 30 of the diaphragm holder 114.
[0048]
A motor mounting opening 16 and a screw insertion hole 17 are provided in the bottom 120 of the case 115, and when the open end 121 a of the cylindrical portion 121 abuts against the open end 116 a of the diaphragm holder 114, the case The housing 104 is formed by the 115 and the diaphragm holder 114.
[0049]
The diaphragm indicated by the reference numeral 107 in FIG. 3 is provided with three diaphragm portions 6 and a vent 108 is perforated at the peripheral end, similarly to the first embodiment described above.
[0050]
In the valve holder denoted by reference numeral 110 in FIG. 3, similarly to the above-described first embodiment, a first valve body mounting hole 44 in which the first valve body 8 is mounted and a second valve body 9 are provided. An engaging projection 38 to be covered is provided, and a vent 111 is perforated at the peripheral end.
[0051]
The sealing material denoted by reference numeral 152 in FIG. 3 is entirely formed of a flexible material such as rubber and has a bottomed cylindrical shape including a bottom 156 and a cylindrical portion 157, as shown in FIG. An annular base 153 is integrally erected at the center of the bottom 156, and a shaft seal 154 formed in a mortar shape from the upper end of the base 153 and opening downward is integrally provided. .
[0052]
The inner diameter of the lower end of the shaft seal portion 154 is formed slightly smaller than the outer diameter of the motor shaft 18 of the motor 2. Two bulging portions 55 and 55 are integrally provided at a portion of the bottom portion 156 that sandwiches the shaft seal portion 154.
[0053]
Further, a ridge 158 formed in an annular shape in plan view is formed integrally with the entire outer peripheral portion of the upper end of the cylindrical portion 157 of the sealing material 152 so as to project therefrom.
[0054]
The seal retainer denoted by reference numeral 170 in FIG. 3 is formed of plastic or metal into a bottomed cylindrical shape having a bottom 171 and a cylindrical portion 172 as shown in FIG. A hole 173 having a diameter slightly larger than the outer diameter of the base 153 of the sealing material 152 is formed in the center of the bottom 171. The expansion of the sealing material 152 is sandwiched between the holes 173. Two bulging portions 174 and 174 covering the protruding portion 55 are provided integrally.
[0055]
As shown in FIG. 3, the height of the cylindrical portion 172 and the height of the cylindrical portion 157 of the seal member 152 are formed to be the same when the seal retainer 170 is overlapped with the seal member 152. ing.
[0056]
The height of the cylindrical portion 172 and the height of the cylindrical portion 157 are set such that the upper end of the cylindrical portion 172 engages with the engaging portion 119 of the diaphragm holder 114 when the diaphragm holder 114 is placed on the case 115. Is formed.
[0057]
With this configuration, the shaft seal portion 154 of the sealing material 152 is inserted into the motor shaft 18 before the crank base 21 is fixed to the motor shaft 18, as in the first embodiment described above. Then, the sealing member 152 is brought into contact with the inner surface of the case 115 so that the bulging portion 55 is covered by the head of the screw 19.
[0058]
The hole 173 of the seal holder 170 is fitted into the base 153 of the seal member 152, and the seal holder 170 is brought into contact with the inner surface of the seal member 152 so as to cover the bulge 55 with the bulge 174. The ridge 158 of the cylindrical portion 157 of the member 152 is elastically deformed and comes into close contact with the inner surface of the diaphragm holder 114.
[0059]
At this time, the ridge 158 of the sealing material 152 is sandwiched between the seal holder 170 and the diaphragm holder 114, and elastically deforms to come into close contact with the inner peripheral surface 116 b of the diaphragm holder 114. Therefore, between the inner peripheral surface 116b of the diaphragm holder 114 and the ridge 158 of the seal member 152, the inside and the outside of the housing 104 are sealed by the seal member 152. In addition, since the lower end of the shaft seal portion 154 of the seal member 152 is tightly sealed to the peripheral surface of the motor shaft 18, the outer peripheral surface of the motor shaft 18 and the lower end of the shaft seal portion 154 of the seal member 152 are sealed. The space between the inside and the outside of the housing 104 is hermetically sealed by the sealing material 152.
[0060]
Further, since the head of the screw 19 is covered by the bulging portion 55 of the sealing material 152, the space between the inside and the outside of the housing 104 in the screw insertion hole 17 is sealed by the sealing material 152. That is, the inside and the outside of the housing 104 are sealed by the sealing material 152.
[0061]
As in the first embodiment described above, the shaft hole 22 of the crankshaft 21 is axially mounted on the motor shaft 18, and the drive shaft 23 is inclined at a position eccentric from the axis of the shaft hole 22 of the crankshaft 21. Stick. Each of the diaphragm portions 6 of the diaphragm 7 is held in each of the diaphragm portion holding holes 31 of the diaphragm holder 14, and the neck portion 33 of each of the diaphragm portions 6 is locked in the mounting hole 28, whereby each of the diaphragm portions 6 is connected to the driving body 3. It is attached to each driver 27.
[0062]
The driving body 3 is rotatably supported by the driving shaft 23 by inserting the ball 57 and the driving shaft 23 into the shaft hole 24 of the driving body 3. The diaphragm holder 114 is placed on the case 115 such that the opening end 116a of the diaphragm holder 14 abuts against the opening end 121a of the case 115.
[0063]
At this time, since the upper end of the cylindrical portion 172 of the seal retainer 170 engages with the engaging portion 119 of the diaphragm holder 114, the upward movement of the seal member 152 and the seal retainer 172 is restricted by the assembly described later. It is attached to the inner surface of case 115.
[0064]
The valve holder 110 to which the first valve body 8 and the second valve body 9 are attached is placed on the diaphragm holder 114, and the lid 13 is placed on the valve holder 110. The diaphragm pump 101 is formed by integrating the lid 13, the valve holder 110, the diaphragm holder 114, and the case 115 by a leaf spring or a rod-shaped (linear) spring (not shown).
[0065]
In the diaphragm pump 1 formed as described above, the valve holder 110, the diaphragm 107, and the respective ventilation ports 111, 108, and 117 of the diaphragm holder 114 communicate with each other. Therefore, the suction port 11 and the inside of the housing 104 communicate with each other through the ventilation ports 111, 108, and 117.
[0066]
Next, the operation of the diaphragm pump 101 having such a configuration will be described. First, a case where the diaphragm pump 101 is used as a pressure pump will be described.
In this case, the suction port 11 is opened to the atmosphere, and the discharge port 12 is connected to a pressurized member (not shown) via a hose or the like. When the motor 2 is driven in this state, one of the three diaphragm portions 6 of the diaphragm 107 descends due to the vertical movement of each driver 27 of the driving body 3 as in the first embodiment described above. Therefore, the pump chamber 5 expands, so that the pump chamber 5 is in a negative pressure state.
[0067]
Therefore, since the first valve element 8 opens the space between the pump chamber 5 and the suction passage 43, the air in the atmosphere is sucked from the suction port 11 into the suction space 59, passes through the suction passage 43, and enters the pump chamber 5. Flows into. When the motor shaft 18 of the motor 2 further rotates and the diaphragm portion 6 of the expanded pump chamber 5 rises, the pump chamber 5 contracts, so that the pressure of the air in the pump chamber 5 increases.
[0068]
At this time, since the second valve element 9 opens the space between the discharge passage 42 and the discharge space 58, the air in the pump chamber 5 is pressure-fed to the discharge space 58 through the discharge passage 42 and is discharged from the discharge port 12. It is discharged into the member to be pressurized via a hose.
[0069]
Next, a case where the diaphragm pump 101 is used as a suction pump will be described. In this case, the discharge port 12 is opened to the atmosphere, and the suction port 11 is connected to a member to be sucked (not shown) via a hose or the like. When the motor 2 is driven in this state, one of the three diaphragm portions 6 of the diaphragm 107 descends as in the case of the above-described pressurizing pump, and the pump chamber 5 expands. Is in a negative pressure state.
[0070]
Therefore, since the first valve element 8 opens the space between the pump chamber 5 and the suction passage 43, the air in the member to be sucked is sucked from the suction port 11 into the suction space 59, and the air passes through the suction passage 43. It flows into the pump chamber 5. When the motor shaft 18 of the motor 2 further rotates and the diaphragm 6 of the expanded pump chamber 5 rises, the pump chamber 5 contracts, so that the air in the pump chamber 5 passes through the discharge passage 42 to the discharge space 58. It is pressure-fed and discharged from the discharge port 12 into the atmosphere.
[0071]
Since the expansion and contraction operation of the pump chamber 5 is performed sequentially and continuously in each pump chamber 5, air in the member to be sucked is continuously sucked from the suction port 11 into the suction space 59, and the inside of the member to be sucked is in a negative pressure state. become. At this time, since the suction port 11 and the inside of the housing 104 communicate with each other through the ventilation ports 111, 108, and 117, the expansion operation of the pump chamber 5 also causes the air in the housing 104 to move. It flows into the pump chamber 5 through 117.
[0072]
In addition, since the interior of the housing 104 and the exterior thereof are kept sealed by the sealing material 152, the interior of the housing 104 is in a negative pressure state like the interior of the member to be sucked. Therefore, since the pressure of the air inside the housing 104 does not become higher than the pressure of the air inside the pump chamber 5 where the diaphragm portion 6 goes down to a negative pressure state, the diaphragm portion 6 It is not deformed by the pressure of the internal air.
[0073]
For this reason, when the diaphragm section 6 is lowered, the pump chamber 5 expands to a predetermined size, so that the diaphragm pump 101 functions normally as an intake pump. Thus, one diaphragm pump 101 can be used for both the pressurizing pump and the suction pump.
[0074]
In the embodiment of the present invention, an example in which three pump chambers 5 are provided has been described. However, the present invention can be applied to a pump having two pump chambers 5 or a pump having four or more pump chambers. Further, in the first embodiment, an example in which the liquid pump is used is described. However, the liquid pump can be used as a gas pump.
[0075]
【The invention's effect】
As described above, according to the present invention, the liquid does not flow out of the diaphragm pump.
[0076]
Further, according to the invention of claim 4, one diaphragm pump can be used for the pressure pump and the suction pump.
[Brief description of the drawings]
FIG. 1 is a sectional view of a diaphragm pump according to the present invention.
2 (a) is a plan view, and FIG. 2 (b) is a cross-sectional view taken along line II (b) -II (b) in FIG. 2 (a). is there.
FIG. 3 is a sectional view of a diaphragm pump according to a second embodiment of the present invention.
4A and 4B show a sealing material according to a second embodiment of the present invention, wherein FIG. 4A is a plan view, and FIG. 4B is a line IV (b) -IV (b) in FIG. It is sectional drawing.
5A and 5B show a seal retainer according to a second embodiment of the present invention. FIG. 5A is a plan view, and FIG. 5B is a line V (b) -V (b) in FIG. It is sectional drawing.
6A and 6B show a diaphragm according to a second embodiment of the present invention. FIG. 6A is a bottom view, and FIG. 6B is a cross-sectional view taken along the line VI (b) -VI (b) in FIG. FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Diaphragm pump, 2 ... Motor, 3 ... Driving body, 4,104 ... Housing, 5 ... Pump chamber, 6 ... Diaphragm part, 7, 107 ... Diaphragm, 8 ... 1st valve body, 9 ... 2nd valve Body, 10, 110: valve holder, 11: suction port, 12: discharge port, 13: lid, 14, 114: diaphragm holder, 15: bottom plate, 16: motor mounting port, 17: screw insertion hole, 18: motor Shaft, 19: screw, 41: partition wall, 42: discharge passage, 43: suction passage, 52, 152: sealing material, 54, 154: shaft seal portion, 55: bulging portion, 58: discharge space, 59: suction Space, 170: seal holder, 108, 111, 117: vent, 119: engaging part.

Claims (4)

A diaphragm having a plurality of diaphragm portions forming a pump chamber, a driving body for expanding and contracting the pump chamber by moving each diaphragm part of the diaphragm up and down, a housing for accommodating the driving body, and a housing for each of the pump chambers. A corresponding suction passage and a discharge passage, a first valve body for preventing a flow from the pump chamber to the suction passage, a second valve body for preventing a flow from the discharge passage to the pump chamber, In a diaphragm pump having a lid having a suction port communicating with a suction passage and a discharge port communicating with the discharge passage, a seal member for sealing between the inside and the outside of the housing is provided inside the housing. A diaphragm pump characterized by the following. 2. The diaphragm pump according to claim 1, wherein said housing is constituted by a cap-shaped diaphragm holder having one opening and a bottom plate for closing an opening of said diaphragm holder, and said sealing material is provided between an opening end of said diaphragm holder and said bottom plate. A diaphragm pump characterized in that the diaphragm pump is sandwiched by: 2. The diaphragm pump according to claim 1, wherein the housing is constituted by a cap-shaped diaphragm holder having one opening and a case formed into a bottomed cylindrical shape that closes an opening of the diaphragm holder, and the sealing material is A diaphragm pump wherein a bottom portion of a case and a contact portion between the diaphragm holder and the case are formed in a closed-end cylindrical shape to seal the case, and the sealing material is sandwiched between a seal retainer, the case and the diaphragm holder. 4. The diaphragm pump according to claim 1, wherein the suction port and the inside of the housing communicate with each other.

Images