JP2011017331A - Multiple-purpose piston or diaphragm type pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a multiple-purpose piston or a diaphragm type pump capable of switching a flowing direction of fluid by an operation defective due to foreign matter mixing in fluid and reversible rotation of a rotary shaft by adopting a rotary switching valve as an intake/discharge fluid valve to widely cope with serial multiple cylinder enabling a purpose of miniaturization and various kinds of fluid by a self-support type.SOLUTION: A reciprocating motion of the piston 14 is performed since driving torque is passed through a connection shaft 12 by a bearing holder 11 from a cam follower 10 moved by a cam groove 8 of a cam block 7 mounted on the rotary shaft 4 driven by a power source. At the same time as the reciprocating motion, operations of supply and discharge of fluid are performed according to rotating directions at each of a fluid A flow passage connection port 25 and a fluid B flow passage connection port 26 by synchronizing with the movement of the piston 14 on a rotary valve stator 19 side by a rotary valve rotor 20 rotating together with the rotary shaft 4.

Description

The present invention relates to a piston or diaphragm pump, which is a kind of a displacement pump, and can be used for various fluid pumps driven by power sources such as various electric motors and engines. The present invention relates to an effective technology that can be applied to industries and facilities.

Piston or diaphragm pumps are used in self-contained pumps, compression pumps, vacuum pumps, and the like, and FIG. 14 shows a sectional view of a typical piston pump structure.

The piston pump shown in FIG. 14 has a stroke of the eccentricity of the bearing 38 and the crank 39 by the rotation of the drive shaft 37 driven by various electric motors or rotating machines such as engines. Reciprocates up and down in the bore 41.

When the piston 40 starts to rise from the bottom dead center, the suction valve 42 is closed by the increase in pressure in the cylinder bore 41, and at the same time, the discharge valve 43 is opened by the pressure and the fluid is discharged from the discharge port 44, and the piston 40 is moved upward. Reach dead center.

When the piston 40 is lowered from the top dead center, the discharge valve 43 is closed due to a decrease in the pressure in the cylinder bore 41, and the fluid flows into the cylinder bore 41 from the suction port 45 when the suction valve 42 is opened. Fluid recovery or supply can be performed.

Since the piston 40 is moved by the crank 39 in the conventional piston type pump as shown in FIG. 14, in order to increase the capacity with the same shape, it is necessary to arrange a plurality of cylinders and pistons to form a multi-cylinder. Etc. became complicated.

In addition, since the suction valve 42 and the discharge valve 43 are opened and closed by the fluid flowing pressure, in the case of a fluid mixed with foreign matter, there is a problem that foreign matter is caught in the opening and closing portion of the bubble, thereby hindering the operation of the pump.

The present invention simplifies the casing, and has a structure that can increase the operating capacity of the piston and a structure that reliably opens and closes the intake and exhaust bubbles, thereby reducing the size and improving the performance of the piston. An object of the present invention is to provide a diaphragm pump.

The piston or diaphragm pump of the present invention has a cylindrical cam block attached to a drive shaft driven by various electric motors or a rotating machine such as an engine, and a circumferential surface engraved on the center of a casing shared with a cylinder bore. The cam follower mounting cup that repetitively moves in conjunction with the shape of the rotating cam groove by two cam followers arranged in the cam groove, and the two connecting lots attached to the cup via the partition Alternatively, the reciprocating motion of the diaphragm is performed, and the holder that tries to rotate with the shaft is fixed by the partition wall.

The central rotating shaft switches the rotary valve that switches the fluid on both sides of the piston or diaphragm in synchronization with the movement of the piston or diaphragm, and discharges and sucks at the two connection ports where the fluid acts Is reliably performed.

In the present invention, the rotary valve switches the fluid in synchronism with the movement of the piston or diaphragm by the rotating shaft, so the direction of fluid flow can be changed by changing the rotating direction of the rotating shaft, and the suction port becomes the discharge port. Since the discharge port becomes the suction port, the operation of the pump can be changed depending on the rotation direction of the shaft.

The disc-shaped rotor side of the rotary valve to which the fluid passages on both sides of the piston or diaphragm are connected is arranged alternately with two sets of fluid passages perforated from the both sides to the periphery and four locations on the stator side The fluid acting on both sides of the piston or the diaphragm is switched to the load side with the rotation of the rotor by the suction port and the discharge port that are perforated.

The rotary contact surface of the rotary valve is formed in a taper shape, and fluid leakage caused by wear of the contact surface is prevented by pressing the rotor against the contact surface by a coil spring.

In the present invention, the fluid on both sides of the piston or diaphragm in the cylinder bore is switched by the rotary valve to double the capacity of the fluid acting on both sides of the piston or diaphragm. It has features that can.

In addition, a plurality of partition walls are provided in the cylinder to create piston bores or diaphragm chambers. The pistons or diaphragm chambers are moved in conjunction with connecting rods, and the piston bores or diaphragm chambers having the same action are each provided with a flow path. It has the feature that it can be connected to increase the volume of fluid several times.

As described above, according to the present invention, the cam block for moving the piston or diaphragm and the rotary valve are linearly and compactly arranged in the cylindrical casing, and the movement of the fluid is forced by the rotary valve to ensure the operation. In addition, since the direction of fluid flow can be changed by changing the direction of rotation by adopting a rotary valve, it becomes possible to flow fluid in both directions with one pump,

In addition, the fluid on both sides of the piston or diaphragm can be used effectively, and at the same time the number of fluids can be increased several times by arranging the pistons or diaphragms in cascade. It is possible.

It is sectional drawing of VV of FIG. 2 which shows the structure of the piston type pump which concerns on Embodiment 1 of this invention. FIG. 3 is an external view seen from the rotary valve side in the first embodiment. It is sectional drawing of W-W 'of FIG. It is sectional drawing of U-U 'of FIG. FIG. 3 is a diagram showing a structure of a cam block 7 in the first embodiment. FIG. 3 is a diagram showing a shape of a cam groove of a cam block 7 in the first embodiment. It is sectional drawing of YY 'of FIG. FIG. 3 is a diagram showing a structure of a holder 11 in the first embodiment. FIG. 3 is a diagram showing a structure of a rotary valve rotor 20 in the first embodiment. FIG. 10 is a cross-sectional view taken along a line X-X ′ in FIG. 9. 3 is a chart of an operation sequence schematically showing a rotational operation state of the piston type pump according to the first embodiment. It is sectional drawing which shows the structure of the piston type pump which concerns on Embodiment 2. FIG. It is sectional drawing which shows the structure of the diaphragm type pump which concerns on Embodiment 3. FIG. It is sectional drawing which shows the structure of the conventional typical piston type pump.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
Embodiment 1
3 is a cross-sectional shape of the piston pump according to Embodiment 1 of the present invention, and FIG. 2 is an external view seen from the rotary valve side, and the cut surfaces shown in FIG. 1 are positions V to V ′ in FIG. The cut surface shown in FIG. 3 shows the positions of W to W ′.

The piston pump of the present invention is used as a pump for supplying or discharging various fluids, and the shaft tip 5 of the rotating shaft 4 is driven by various motors or engines through a coupling or the like. Both ends of the rotary shaft 4 housed in the cylinder case 2 and the end base 3 are supported by bearings 6, and the whole is made of metal, plastic or the like.

The cylinder case 2 includes a cam block 7 that operates a piston, a cylinder bore A portion 15, a cylinder bore B portion 16, and a rotary valve portion 18. The cam block 7 and the cylinder bore A portion 15 are separated by an A partition wall 13. The holder 11 and the piston 14 are connected via the A partition wall 13 by the rotating shaft 4 and the connecting shaft 12 which are divided and penetrate the partition wall, and a bearing bush and a mechanical seal are attached to the penetrating portion.

The cam block 7 is fixed to the rotating shaft 4 by a set screw 9, the rotary valve rotor 20 is fixed only in the rotating direction by a non-rotating pin 24 in a state of being slightly movable in the axial direction, and the holder 11 and the piston 14 are rotating shafts. 4 is configured to be movable in parallel with respect to 4.

The cam block 7 has the shape shown in FIG. 5, and a wavy cam groove 8 as shown in FIG. 6 is dug on the circumferential side surface so that the cam follower 10 in the groove follows the groove shape by the rotation of the cam block 7. The two cam followers 10 are attached to the holder 11 shown in FIG. 8, and the operations of the cam follower 10 and the holder 11 are transmitted to the piston 14 through the A partition wall 13 by the connecting shaft 12.

The rotary valve rotor 20 of the rotary valve unit 18 has a structure in which it can be moved slightly in the axial direction without moving in the rotational direction by the anti-rotation pin 24 into the elliptical hole formed in the rotary shaft 4. 10 is a cross-sectional view taken along the line X to X ′ shown in FIG. 10, and the portion to be fitted to the rotary valve stator 19 is tapered, and the rotary valve rotor is pressed against the rotary contact surface of the rotary valve stator 19 by the press contact spring 23. By doing so, fluid leakage is prevented.

The relationship between the operation of the piston 14 and the rotary valve rotor 20 with respect to the rotation of the cam groove 8 and the flow direction of the fluid will be described with reference to the operation sequence chart of FIG. 11. In the case of one rotation up to 0 °, the piston 14 is at the top dead center at the 0 ° point, and the fluid A channel connection port 25 and the fluid B channel connection port 26 of the rotary valve stator 19 of the rotary valve unit 18 are the rotary valve rotor 20. Is closed.

When the cam block 7 starts to rotate toward the 90 ° point, the piston 14 starts to descend, the cylinder bore A portion 15 starts to depressurize, and simultaneously the cylinder bore B portion 16 starts to pressurize, and the rotary valve rotor of the rotary valve portion 18 is started. 20 also rotates, discharges the fluid to the fluid A channel connection port 25 via the rotary valve rotor A channel 21, and the cylinder bore A from the fluid B channel connection port 26 via the rotary valve rotor 22 and the fluid communication channel 17 The operation of sucking fluid from the unit 15 is started.

Next, when the cam block 7 passes through the 90 ° point and reaches the 180 ° point, the piston 14 reaches the bottom dead center, and the cylinder bore A portion 15 completes the suction of the fluid, and at the same time, the cylinder bore B portion 16 discharges. At the same time, the rotary valve rotor 20 of the rotary valve unit 18 closes the fluid A channel connection port 25 and the fluid B channel connection port 26.

Next, when the cam block 7 passes the 180 ° point and rotates to the 270 ° point, the piston 14 starts to rise from the bottom dead center and the cylinder bore A portion 15 starts to pressurize, and at the same time, the cylinder bore B portion 16 reduces the pressure. First, the rotary valve rotor 20 of the rotary valve unit 18 rotates and discharges the fluid from the fluid A channel connection port 25 through the rotary valve rotor B channel 22, and passes through the rotary valve rotor A channel 21 from the fluid B channel connection port 26. The operation of sucking the fluid is performed and the operation is repeated after reaching the 0 ° point.

When the rotating shaft 4 is reversed from the above rotation direction, the piston 14 starts to descend from the 0 ° point toward the 270 ° point, and the cylinder bore A portion 15 starts to be depressurized and at the same time the cylinder bore B portion 16 is pressurized. The operation is the same as the operation from 0 ° to 90 °, but the rotary valve rotor 20 rotates in the reverse direction, so that the cylinder bore A portion 15 side passes through the rotary valve A flow path connection port 21 and the fluid B flow When the cylinder bore B portion 16 side is connected to the fluid connection passage 26 through the rotary valve B passage connection port 22 to the passage connection port 26, and the direction of fluid flow is 0 ° to 90 ° It is the opposite.

Embodiment 2
FIG. 12 shows the structure of the piston type pump according to the second embodiment. In the first embodiment, the cylinder bore A portion 15, the cylinder bore B portion 16 and the piston 14 are provided. In the second embodiment, a B partition wall 27 is provided and connected. Extend the shaft 12 and add an additional piston 28, cylinder bore C section 29 and cylinder bore D section 30 in the cylinder case 2, and add fluid B connection path 31 to increase the operating capacity with two pistons and bore sections. Needless to say, it is possible to increase the capacity of the pump several times by repeating the above method, which can be increased twice.

Embodiment 3
FIG. 13 shows a structure in which the piston portion of the piston-type pump according to Embodiment 3 is a diaphragm type. In Embodiment 1 and Embodiment 2, the portion of the piston 14 operating by the connecting shaft 12 is shown in this embodiment. The diaphragm 33, which moves the diaphragm central support plate 32, is formed in a disk shape using a film-like material such as metal, rubber, resin, etc., and the peripheral portion is fixed by the diaphragm peripheral fixing portion 34. As the central portion of the diaphragm moves by the reciprocating movement of the connecting shaft 12, the fluid in the A fluid chamber 35 and the B fluid chamber 36 moves, and the first and second embodiments are switched by switching the rotary valve portion 18 that rotates synchronously. A diaphragm pump for supplying and recovering fluid from the fluid A channel connection port 25 and the fluid B channel connection port 26, Rukoto can.

As described above, according to the present invention, it is a self-contained pump capable of dealing with various types of fluids, which eliminates unstable operation of the valve-type valve by adopting a rotary valve and changes the flow direction of the fluid by reversible rotation. Therefore, the present invention is useful for increasing the capacity and reducing the size by making the pistons or diaphragms multiple.

The present invention is not limited to the above-described embodiment, and it goes without saying that various modifications and applications are possible without departing from the scope of the present invention.

1 Mounting base 2 Cylinder case 3 End base 4 Rotating shaft 5 Shaft tip 6 Bearing bearing 7 Cam block 8 Cam groove 9 Set screw 10 Cam follower 11 Holder 12 Connecting shaft 13 A Bulkhead 14 Piston 15 Cylinder bore A section 16 Cylinder bore B section 17 Fluid A communication path 18 Rotary valve portion 19 Rotary valve stator 20 Rotary valve rotor 21 Rotary valve rotor A flow path 22 Rotary valve rotor B flow path 23 Pressure contact spring 24 Non-rotating pin 25 Fluid A flow path connection port 26 Fluid B flow path Connection port 27 B partition 28 Additional piston 29 Cylinder bore C part 30 Cylinder bore D part 31 Fluid B communication path 32 Diaphragm center support plate 33 Diaphragm 34 Diaphragm peripheral fixing part 35 A fluid chamber 36 B fluid chamber 37 Drive shaft 38 Bearings 39 crank 40 piston 41 cylinder bores 42 suction valve 43 discharge valve 44 discharge opening 45 inlet

Claims (6)

A cam follower placed in the cam groove carved in the circumferential surface of a cylindrical cam block attached to the main shaft that is rotated by a drive source such as an electric motor or various engines at the center of a casing shared with the cylinder bore The holder attached with the reciprocating motion that is linked to the shape of the cam groove by the rotation of the cam block and the reciprocating motion of the piston or diaphragm from the holder via the connecting lot, Suction and discharge operations are switched in synchronism with the reciprocating motion of the piston or diaphragm by a rotary valve attached to the rotating shaft for suction and compression, and fluid is supplied and discharged according to the purpose at two fluid connection ports. A piston or diaphragm type pump characterized by performing the following operations. 2. The piston or diaphragm type pump according to claim 1, wherein the pressure and pressure reducing action acting on the fluid on both sides of the piston or diaphragm in the cylinder bore are switched on both sides by a rotary valve linked to the main shaft. A piston or diaphragm pump characterized by doubling the volume of the cylinder bore acting on the fluid. 3. The piston or diaphragm pump according to claim 1, wherein the fluid can be supplied and recovered by the same pump by easily changing the flow direction of the fluid by reversibly rotating the rotating shaft. Or a diaphragm pump. The piston or diaphragm type pump according to claim 1, 2, 3 or 2, wherein the rotary valve rotor that rotates simultaneously with the drive shaft has two holes bored from both disk-shaped surfaces toward the circumferential surface, and the stator side. A piston or diaphragm pump characterized in that a rotary valve that switches the flow of fluid in conjunction with the movement of the piston is provided in combination with the suction and discharge holes. 5. The piston or diaphragm pump according to claim 1, 2, 3 or 4, wherein a plurality of sets of pistons or diaphragm chambers are provided in the cylinder, and fluid flow paths are provided in cooperation with each other by providing fluid passages on the same operation side. Piston or diaphragm pump characterized in that it can be increased multiple times. 5. The rotary valve according to claim 4, wherein the rotary contact surface of the rotor and the stator of the rotary bubble is tapered so that there is a margin of movement only in the axial direction in which the fixing between the rotor and the rotary shaft rotates. A rotary bubble characterized by preventing fluid leakage due to wear by constantly applying contact pressure to the contact surface with the stator side with a spring.

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