JP2002115648A - New special pump structure - Google Patents

Abstract

(57) [Summary] [Purpose] A multi-pump for civil engineering work is easy to manufacture, easy to maintain and maintain, is low in cost, and has good durability. A cam (1) has a rotating shaft (2).
And only one sheet is provided, and the protrusion 12 and the recess 13
Are arranged adjacent to each other and the cam follower tappet 9 of the pump 6 arranged in the periphery is brought into close contact with the cam 1. [Effect] Compared to a conventional small cam, the structure is simple and easy to manufacture because there is only one cam, operation and maintenance are extremely easy, and it is possible to manufacture at low cost and to have high durability.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The disclosed technology belongs to the technical field of the construction of a multipump for multi-super-multipoint injection having a single large single cam.

[0002]

2. Description of the Related Art As is well known, recently, the life of citizens has remarkably improved, but such improvement of citizen life is based on the prosperity of various industries, and the various industries are supported by the advanced development of science and technology. ing.

[0003] In the various industries, various pumps are indispensable in the drainage treatment, the cooling treatment, the water treatment process, and the various water use industries, and are widely used in various fields.

By the way, a reciprocating pump is generally a piston pump of a high pressure, a high head, etc., while a reciprocating pump is widely used. A piston pump of this kind generally uses a crank system as a driving system. Is transmitted as a reciprocating motion to the piston rod, and the piston is reciprocated in the cylinder to perform the pressure suction operation.

[0005] However, in such a crank type piston pump, even if the crankshaft performs a constant velocity circular motion, the piston performs a reciprocating motion at a speed of drawing a sine curve. However, pulsating movement is inevitable for the liquid to be discharged at a variable speed. Structures that operate, smoothen, and reduce pulsation are also employed.

In some cases, the durability of the crankshaft is reduced due to severe wear due to high-speed rotation of the crankshaft.
A mode for reducing the pulsation width is also adopted.

However, in view of the operating principle, the crank type piston pump has a structure in which pulsation is inevitable.

Further, changing the circular motion of the crankshaft only by changing the linear reciprocating motion of the piston requires a crank chamber having a size that reaches about 70% of the pump weight, and changing the rotational angular velocity of the crankshaft is difficult. It is extremely difficult, and although the design of the metering pump by the improvement of the crank has been tried many times, there is a neck that has not actually appeared.

Therefore, a hydraulically driven piston pump has been used by using a mechanism capable of performing a pressurizing action at a high speed in place of a crank type piston pump, and the stepless speed change function can be easily adopted. Therefore, the hydraulically driven piston pump is used in a considerable industrial field as a piston pump having a high-grade function, but the hydraulically driven piston pump is extremely expensive in terms of cost, and the pressure from the motor is indirectly controlled. The structure is designed to transmit power to the piston, so energy efficiency is low and the size cannot be avoided.
It has the disadvantage that maintenance costs as well as initial costs are high.

[0010] As described above, there is no piston pump that can be driven at a constant capacity without any pulsation, and there are no piston pumps that are hydraulically driven as a crank type piston pump. However, it has been necessary to use a hydraulically driven piston pump, which is expensive and requires maintenance cost, as a fixed-rate discharge piston pump capable of maintaining a constant discharge rate.

As described above, the hydraulically driven piston pump also has a drawback as an inefficient piston pump because power is indirectly transmitted to the piston via the driving force from the motor, as described above.

In order to cope with this, a cam-driven piston pump has been devised, and a design which can be put to practical use has been developed.
The cam fixed to the camshaft is moved forward and backward as a cam follower tappet that rotates at a constant angular speed by the camshaft that rotates at a constant speed, and pressurizes a reciprocating type piston included in the cylinder 5 via a piston rod. There is a mode in which a return spring interposed between a cam follower tappet and a cylinder performs a suction function to perform a piston function.

However, in such a conventional cam driven piston pump, when the rotation 1 of the camshaft and the position of the cam orbit are taken on the vertical axis and the angle on the horizontal axis, a characteristic curve of a kind of sine curve is obtained. It is known that when the cam angle is plotted on the horizontal axis, the operation draws a sine curve and draws a complicated curve as shown by the ┼ and ─ lines of acceleration.

Therefore, the change in the acceleration of the piston is ┼,
The ─ side is point symmetrical, and there is a difficulty that stable pressurizing operation and suction operation are difficult to be performed on average.On the other hand, cam follower tappets are arranged at regular intervals around the cam, and On the other hand, a technique is also possible in which the piston rod is moved forward and backward, the pressurizing action and the pressurizing and suctioning action via a spring are multi-type, and the driving is smoothed.

[0015]

However, in the conventional cam drive type piston pump of the above-described conventional type, particularly when the cam is a disk-shaped disk, the shape of the cam is constant. As described above, since the change in the acceleration during the pressurizing action and the change in the suction action of the piston is point-symmetric and constant, there is a drawback that the smooth pressurization and suction action cannot be essentially obtained.

To cope with this, a technique for changing the rotation speed (angular speed) of the camshaft by using a motor connected to the camshaft as an inverter motor is theoretically possible. There was a disadvantage that it was not effective and could not be put to practical use.

Although the piston pump of the crankshaft drive type has been widely used as the mainstream of the piston pump as a long and stable pump technology for a long time, the crankshaft has considerable skill and skill in manufacturing. However, it is difficult to control the precision, and the size of the crankcase occupies a larger volume than the size of the pump. As a result, the manufacturing cost of the crank mechanism is increased, which is disadvantageous in that it is not economically viable.

In the crankshaft type piston pump, the piston also makes one reciprocating movement via the connecting rod during one rotation of the crankshaft. The pressurization process is alternately repeated, and therefore, the prime mover of the piston pump is in a state where the prime mover is almost half of idling naturally, and therefore, usually, a twin type cylinder is used together, and three to four cylinders are used. There is also a mode of double connection using.

On the other hand, the hydraulic drive system uses an inverter motor for constant discharge at a constant speed and a low-speed function change.
There is a feature that the hydraulic pump and the piston pump can be separated from each other, but they require high cost for maintenance and are inefficient in terms of cost, so that the use range is narrowed.

Due to such a number of necks, the research and development of the crankshaft type piston pump has been hampered, and attempts have been made to improve the practical use of hydraulically driven pumps.

To cope with this, Japanese Patent Laid-Open Publication No.
No. 4, the multi-pump for super multi-point injection has been developed. However, a large number (plural) of cams are integrally provided for a single drive shaft, and the pump is provided in parallel. The pump itself has the disadvantage that the structure is complicated, long-term operation becomes impossible, and the piston packing is also difficult to last for a long time. And the maintenance is complicated, the pump is overloaded, and the durability of the piston cylinder and the packing is shortened.

[0022]

SUMMARY OF THE INVENTION It is an object of the invention of the present application to make the cam into a single one-piece system by using the basic advantages of the cam type piston pump based on the above-mentioned prior art, and to form a large cam,
In addition, it is easier to design a cam with a constant discharge rate than a cam, and the direction of the cam force toward the piston cylinder is nearly parallel, so that a lateral force is less likely to be applied to the cylinder and piston, and stable operation has appeared. In addition, the piston packing has a long-lasting and long-lasting function, and it is possible to provide a new type of special pump structure that can be used multiple times with one rotation of the cam, which is beneficial to the field of water use technology in various industries. .

[0023]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a single drive cam is provided with one single cam in order to solve the above-mentioned problems. A single cam multi-pump structure having a plurality of protrusions and being in close contact with a cam follower tappet of a corresponding pump, wherein the single single cam includes a plurality of protrusions and a plurality of protrusions. Adjacent recesses are formed in number and are closely attached to the cam follower tappet, so that the prime mover having the above-mentioned cam structure and an inverter is arranged in a stacked state with respect to the frame. In addition, a technical measure is adopted in which the shape of the cam is made linear and the pumps are arranged at equal intervals around the cam.

[0024]

In the above construction, when the piston pump is operated, the camshaft is rotated at a constant angular velocity, the cam surface of the cam pressurizes the piston with a predetermined acceleration by the pressurized curved surface, and sucks at the predetermined acceleration. The follower tappet at the tip of the piston rod of many (plural) pumps provided with one single cam surface comes into close contact with the protrusion on the cam surface and the recess adjacent to the protrusion. Perform pressure suction,
The large cam can be pressurized multiple times in one rotation, and the cam with a shape with a high pressure suction ratio is also difficult to use for the pump because the pressing direction of the large cam is almost parallel to the center line of the cam. It is designed to improve the durability of the piston cylinder and packing.

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The following is a description of embodiments of the present invention as embodiments of the present invention, with reference to FIGS. 1 to 7. FIG.

[0026]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the embodiment shown in FIGS. 1 and 2, reference numeral 1 denotes a small cam of a conventional cam pump, and its shaft 2 is connected to a geared motor 5 provided next to an inverter 4 provided at the middle stage of a frame 3. The cam 1 has an elliptical shape for pumping a working distance line object, and a predetermined number of piston pumps 6 and 6 are provided on its cam surface. A suction spring 8 is pumped on 7 and a cam follower tappet is closely contacted with a predetermined number of cam surfaces. Each piston pump 6 is connected to a liquid supply pipe 9 ′. 10 is provided and connected to the liquid sending pipe 11.

The large single cam 1 has an elliptical shape, but the embodiment shown in FIGS. 3 and 4 is an embodiment of a system which mainly focuses on the arrangement for shortening the distance between the pump stage and the accumulator 10. Yes, the weight balance is not good as compared with the embodiment shown in FIGS. 1 and 2, but the arrangement of the electric wiring, the switch and the inverter 4 makes it unnecessary to pay attention to liquid leakage and the like.

Therefore, this is an embodiment in which no trouble or the like occurs in the electric system.

When the pump unit 6 is set on the upper stage of the pump unit 6 shown in FIGS. 1 and 2, the cam 1 can be easily replaced like a record, and maintenance and inspection can be easily performed.

The cam 1 'in the embodiment shown in FIG. 4 is an embodiment of a single pressurized cylindrical cam 1' for one rotation, and the shape of the cam is a left-right symmetrical type.

An average force is applied to the rotating shaft.

The cam 1 'shown in FIG. 5 is an elliptical embodiment of a one-rotation, two-rotation pressurizing method. Since the center of the rotating shaft 2 is provided, if the pumps are arranged at equal intervals around the cam, an average force is always applied to the rotating shaft.

Incidentally, in the super multi-point injection method, a pump having a small discharge amount is used, and the injection speed set for each pump may be different. Therefore, in the transmission mechanism of the pump, the pump is moved forward and backward to come into contact with the cam. No angle is formed, resting the piston and reducing the discharge volume.

Therefore, when the elliptical acceleration and the suction are stopped to operate at the same time interval, the pressurization time becomes shorter than the suction time.

As a result, a cam as shown in FIG. 6 is formed as a deformable cam 1 '''of an elliptical cam having a long pressurization time of 5: 1 and a pressurization time of 5: 1.

In the embodiment shown in FIG.
This is an embodiment of a rotation pressure cam 1 ''''', in which an elliptical cam presses a piston twice in one rotation.

In the embodiment shown in FIG. 7, the pressure is applied four times in one rotation. There are four protrusions 12 and the recess 13 can be designed linearly. Relatively smooth.

Therefore, it can be said that, as described above, the aspect of the cam structure to be selected can be adopted in comparison with the principle function, performance and power.

[0039]

As described above, according to the invention of this application, one piece of the rotary shaft is used in a single type multipump used in super multi-point injection work which is often newly adopted recently in civil engineering work and the like. Is arranged only on the cam surface of the cam so that the protrusion and the recess are adjacent to each other, and furthermore, the cam follower tappet of the piston pump disposed around the cam is in close contact with the cam follower tappet. As a result, compared to the conventionally developed small cam, there is an excellent effect that the structure is simple and easy to manufacture because there is only one cam.

Further, the pump is arranged concentrically around the cam, which has an excellent effect that the inspection operation and the management operation are extremely easy.

The large cam according to the invention of this application also has an advantage that it is extremely easy to design a constant discharge amount cam as compared with the conventional small cam.

Since the direction of the force of the cam toward the piston cylinder is nearly parallel, the cylinder and the piston are hardly subjected to a lateral force, so that stable operation is realized, and the durability against the piston packing is also good. Excellent effects are achieved.

The large cam according to the invention of this application also has an effect that a plurality of pressurizations can be performed in one rotation.

A cam having a shape with a high pressure / suction ratio is also close to the piston, and a large cam is close to the center line of the shaft. Also, the effect that the durability comes out is exerted.

[Brief description of the drawings]

FIG. 1 is a schematic plan view showing the principle of connection between a cam and a pump according to the present invention.

FIG. 2 is a schematic side view of an arrangement of a pump unit in a frame.

FIG. 3 is a side view of an embodiment of another embodiment corresponding to FIG. 2;

FIG. 4 is a plan view of one pressure cylindrical cam.

FIG. 5 is a plan view of an elliptical cam pressed twice a rotation.

FIG. 6 is a plan view of an embodiment of a large-sized constant-velocity pressure cam having a pressure-suction ratio of 5: 1.

FIG. 7 is a schematic plan view of a pressure cam four times per rotation.

[Explanation of symbols]

 1-1 1 '' '' Cam 6 Pump 12 Convex part 13 Concave part 4 Inverter 3 Frame

Claims (4)

[Claims] 1. A single-cam multi-pump structure in which a single cam on a single drive shaft has a plurality of protrusions and is in close contact with a cam follower tappet of a corresponding pump.
A new special pump structure, wherein the one single cam is formed with a plurality of protrusions and recesses adjacent to the protrusions, and is in close contact with the cam follower tappet. 2. The new special pump structure according to claim 1, wherein a prime mover provided with the cam and the inverter is arranged in a stacked state with respect to the frame. 3. The new special pump structure according to claim 1, wherein said cam has a line symmetrical shape. 4. The new special pump structure according to claim 1, wherein a plurality of said pumps are arranged around the cam at equal intervals.