KR20190018359A - Triangular rotary pump equipped with pulsation reducing means - Google Patents

Abstract

The present invention relates to a triangular rotary pump including a pulsation reducing means. The present invention provides a triangular rotary pump including: a rotor housing which forms a pumping space formed in an epicycloid locus in the interior thereof and in which a suction hole is formed on one side thereof and a discharge hole is formed on the other side thereof; a rotor which has a round triangular shape and is eccentrically rotated while three apexes inscribe each other in the pumping space; a crank shaped eccentric driving shaft which is coupled to the center of the rotor to be rotated; and a motor which rotates the eccentric driving shaft, wherein a mixing chamber which communicates with the discharge hole is provided on a lower surface of the rotor housing, and an impeller which is coupled to the eccentric driving shaft and is rotated is provided in the mixing chamber. The fluid introduced into the mixing chamber through the discharge hole reduces the pulsation of the triangular rotary pump while being mixed.

Description

Technical Field [0001] The present invention relates to a triangular rotary pump equipped with pulsation reducing means,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a triangular rotary pump, and more particularly, to a triangular rotary pump having a pulsation reducing means capable of reducing pulsations periodically generated when a fluid is pumped in a triangular rotary pump, which is a positive displacement pump.

Generally, a pump is a device for transferring a fluid by receiving the power of a driving means such as a motor and transferring the fluid. The pump is a non-volumetric pump in which energy is switched in an unsealed state, (Positive displacement pump). In the cost-reducing pump, the discharge pressure decreases as the discharge amount increases, and there are centrifugal pumps, sludge pumps, axial flow pumps, and the like depending on its mechanism and structure.

The positive displacement pump has a substantially constant discharge amount irrespective of the load pressure, and includes a piston pump, a plunger pump, a gear pump, a screw pump, and a vane pump. The positive displacement pump is a system in which a cylinder having a constant volume equipped with an intake valve and a delivery valve is made into a vacuum in a cylinder for reciprocating linear motion such as a piston, a plunger, or a bucket to suck the liquid, There is a reciprocating system which supplies the required pressure to the liquid by supplying the positive pressure energy to the liquid, and a rotary type which rotates the special type rotor in the casing and pumps it.

Rotary pumps among rotary volume pumps are used for a variety of applications such as industrial and rural drainage for the transportation of highly viscous solids, treatment of dirt and wastewater containing various kinds of sludge, spraying of orchard pesticides, , And is capable of pumping from the operation of gears, vanes, screws, etc. in most cases.

Since the rotary pump having such a structure has a limited discharge pressure, when the pump is used for a long time, or when the pumping pressure is increased, the rotor formed inside is worn out and the pumping efficiency is greatly reduced. The discharge port or inlet port is clogged due to the contained sludge or foreign matter. In particular, when the present invention is applied to an industrial field in which highly viscous solid matter is transferred, the discharge port or inlet port of the pump is blocked The pumping force is greatly reduced.

To overcome these disadvantages, a rotary pump has been disclosed that reverses the principle of Wankel Engine applied to automobiles in recent years.

The rotary pump using the principle of the Wankel engine is equipped with a rotor having an internal space (epicycloid curve) formed like a cocoon and having a triangular shape inside a rotor housing having an external fluid inlet and an outlet, And the external gear which is in contact with the internal gear is rotated by the drive shaft, thereby rotating the rotor eccentrically to suck and discharge the fluid.

Korean Patent No. 10-0381801 (April 14, 2003) discloses a gear type high pressure positive displacement pump, and Korean Patent No. 10-1655160 (2016.9.1) discloses an eccentric rotary shaft type rotary piston pump Lt; / RTI >

In general, the cost-effective pump described above has a problem in that it is difficult to adjust the discharge amount accurately because the discharge amount is not constant, but there is no pulsation phenomenon.

On the other hand, the positive displacement pump is advantageous in that it can discharge an accurate amount, but there is a problem that pulsation occurs.

Since the triangular rotary pump using the triangular shaped rotor is also a positive displacement pump, pulsation occurs. That is, continuous suction and discharge do not occur, but suction and discharge occur for a certain period of time, and repeatedly repeated, so that pulsation is inevitable.

These pulsating phenomena adversely affect the vibration and noise of the pump, the damage of the sealing member, the life of the motor and the rotor, and the peripheral equipment such as the surrounding piping.

- Korean Registered Patent No. 10-1655160 (September 1, 2016) "Rotary piston pump" - Korean Patent No. 10-0381801 (Apr. 14, 2003) "High-pressure positive displacement pump" - Korean Registered Patent No. 10-1035416 (2011.5.11) "Rotating volumetric pump with pulsation reducing function"

SUMMARY OF THE INVENTION Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and it is an object of the present invention to provide a triangular rotary pump in which an impeller is attached to a pump so as to reduce vibration due to inhalation of fluid, And a triangular rotary pump provided with pulsation reducing means.

According to an aspect of the present invention, there is provided a triangular rotary pump including pulsation reducing means, a rotor housing having a pumping space formed therein with an epicycloidal locus therein, a suction port formed on one side thereof and a discharge port formed on the other side thereof, A rotor having a round triangular shape and eccentrically rotating in a state where three vertexes are in contact with each other in the pumping space; a crankshaft-shaped eccentric drive shaft rotatably coupled to the center of the rotor; and a motor for rotating the eccentric drive shaft In the triangular rotary pump, a mixing chamber communicating with the discharge port is provided on the lower surface of the rotor housing, and an impeller rotatably coupled to the eccentric drive shaft is provided in the mixing chamber. Is mixed with the pulsation of the triangular rotary pump Can.

Here, the mixing chamber may include an impeller accommodation portion in which the impeller is accommodated and a main outlet is formed in a side portion thereof, a shaft accommodation portion communicated with the impeller accommodation portion and through which the eccentric drive shaft passes, And an inlet for communicating.

A first inlet port and a second outlet port are formed at one side of the rotor housing, and a first outlet port and a second inlet port may be formed at the other side.

Further, a damping chamber may be provided between the motor and the rotor housing, in which a main inlet port through which fluid is introduced into one side is formed, and a first channel and a second channel communicate with the first inlet port and the second inlet port, respectively have.

According to the present invention having the above-described configuration, the fluid periodically discharged through the discharge port of the rotor housing is mixed with the impeller rotating together with the rotor in the mixing chamber, whereby the pulsating pressure is canceled and remarkably reduced have.

And the flow rate and pressure of the fluid can be stably pumped while reducing the ripple phenomenon by driving the impeller.

Also, since the impeller torque is increased by the pressure of the fluid flowing into the mixing chamber, the power can be saved

In addition, since the damper chamber is provided, the pulsation phenomenon occurring at the time of suction can be buffered, so that vibration and noise can be remarkably reduced as a whole.

1 is a perspective view showing an outer appearance of a triangular rotary pump having pulsation reducing means according to an embodiment of the present invention;
Fig. 2 is a longitudinal sectional view of the AA portion of the present invention shown in Fig. 1
Fig. 3 is a cross-sectional view in which the CC portion is cut in Fig. 2
Fig. 4 is a transparent perspective view showing the internal structure of the rotor housing of the present invention,
Fig. 5 is a vertical sectional view of the BB portion of the present invention shown in Fig. 1
6 is a transparent perspective view showing the internal structure of the pulsation reducing means of the present invention.
FIG. 7 is a cross-sectional view taken along line DD in FIG.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

For a better understanding of the present invention, the description with reference to the drawings is not intended to limit the scope of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

FIG. 1 is a perspective view showing the external appearance of a triangular rotary pump having pulsation reducing means according to an embodiment of the present invention, and FIG. 2 is a longitudinal sectional view of the AA portion of the present invention shown in FIG.

The present invention has a structure in which a pulsation reducing means 200 is added to an outlet side of a pump to reduce the ripple phenomenon of a known triangular rotary pump 100 and includes a rotor housing 110, a rotor 120, And a pulsation reducing means 200 composed of a motor 130, a motor 140, a mixing chamber 210, and an impeller 220.

First, referring to FIGS. 3 and 4, a rotor housing, a rotor, an eccentric drive shaft, and a motor constituting the triangular rotary pump 100 will be described. FIG. 3 is a cross-sectional view taken along CC in FIG. 2, and FIG. 4 is a transparent perspective view showing the internal structure of the rotor housing of the present invention in FIG. In Fig. 3, it is assumed that the rotor rotates counterclockwise. In Fig. 4, the solid arrow indicates that the fluid is sucked through the suction port, and the dotted arrow indicates that the fluid is discharged through the discharge port.

The rotor housing 110 is formed therein with a pumping space p capable of accommodating the rotor 120. The pumping space p has an epicyclic curve e in cross section. That is, a cocoon cushion shape formed inside the casing of the conventional scooter engine, or a locus of a shape in which two circles are partially overlapped.

For reference, the epicycloid curve shows a trajectory in which an arbitrary point is left on the circumference of a rotating circle when a circle having a radius of 1 and a radius of 1 is circled in a circle having a center at the xy rectangular coordinate and a radius of K it means. Various types of epicycloid curves are formed according to the value of K. In the present invention, a curve as shown in the figure can be formed when K is 2.

A discharge port 112 may be formed at one side of the outer surface of the rotor housing 110 to form a suction port 111 through which fluid is sucked and a fluid to which the pumped fluid is discharged.

Alternatively, the first suction port 111a and the second discharge port 112b may be formed on one side and the first discharge port 112a and the second suction port 111b may be formed on the other side. At this time, the first suction port 111a and the first discharge port 112a are disposed to face each other, and the second discharge port 112b and the second suction port 111b are disposed to face each other.

More specifically, a first suction port 111a is formed on one side of the upper half of the pumping space p, a first discharge port 112a is formed on the other side, a second discharge port 112b is formed on one side of the lower half of the pumping space, And a second suction port 111b is formed on the other side.

Here, the first suction port 111a and the second suction port 111b form an approximately '┗' or '┛' shape that forms a flow path upward from the side of the pumping space so as to communicate with a damping chamber 300 .

The first discharge port 112a and the second discharge port 112b are formed in a substantially '┏' or '┓' shape in which a flow path is formed downward from a side surface of the pumping space p to communicate with a mixing chamber 210 .

Next, the rotor and the eccentric drive shaft will be described with reference to FIG. Fig. 5 is a vertical cross-sectional view of the BB portion of the present invention shown in Fig. 1. Fig.

The rotor 120 has a substantially round triangular shape. Specifically, each side of the equilateral triangle can be shaped to bulge outward.

The rotor is housed in the pumping space p in the rotor housing 110 and rotates while the three vertexes are in close contact with each other without being separated from the inner surface of the pumping space p. That is, as the three vertexes of the rotor 120 move along the epicycloid locus e, the rotor 120 naturally eccentrically rotates.

The eccentric driving shaft 130 may be coupled to the rotor 120 to guide the eccentric rotation of the rotor 120. The eccentric driving shaft 130 may be rotatably coupled to the rotor 120 through the center of the rotor 120, A first eccentric shaft 131 which is connected to the rotation shaft 141 in such a manner as to be displaced in the axial direction and a second eccentric shaft 131 which is axially coupled to the impeller 220 and is axially coupled to the first eccentric shaft 131, And a second eccentric shaft 132 which is offset from the first eccentric shaft 132 and has substantially the same shape as the crankshaft.

However, the second eccentric shaft 132 is axially aligned with the rotation axis 141 of the motor 140.

Therefore, when the rotation shaft 141 rotates by the motor 140, the first eccentric shaft 131 rotates about the rotation axis 141 or the second eccentric shaft 132, The rotor 120 rotates eccentrically with the three vertexes confined within the pumping space p.

Since the first eccentric shaft 131 and the rotor 120 are subjected to mutual force during the rotation to generate friction, a bearing is interposed between the first eccentric shaft 131 and the rotor 120, Can be further interposed.

Next, the pulsation reducing means corresponding to the technical features of the present invention will be described with reference to FIG. 6 is a transparent perspective view showing the internal structure of the pulsation reducing means of the present invention. The dotted arrow in FIG. 6 represents the flow of fluid entering the mixing chamber through the inlet.

The pulsation reducing means 200 is coupled to the lower surface of the rotor housing 110 and may include a mixing chamber 210 and an impeller 220 as shown in FIG.

The mixing chamber 210 has a receiving space for receiving the impeller 220 therein and communicates with the discharge port 112 of the rotor housing 110.

More specifically, the mixing chamber 210 may include two spaces: an impeller receiving portion 211 receiving the impeller 220 and a shaft receiving portion 212 receiving the eccentric driving shaft 130.

At this time, the impeller receiving portion 211 and the shaft receiving portion 212 are cylindrical, and the impeller receiving portion 211 accommodates the impeller 220, so that the inner diameter of the impeller receiving portion 211 is larger than that of the shaft receiving portion 212.

The shaft receiving portion 212 passes through the second eccentric shaft 132 of the eccentric drive shaft 130 and the inner diameter of the shaft receiving portion 212 is larger than the outer diameter of the second eccentric shaft 132 do.

Therefore, a gap is formed between the second eccentric shaft 132 and the inner diameter of the shaft receiving portion 212, and the fluid flows into the impeller receiving portion 211 through the gap.

Meanwhile, the shaft receiving portion 212 and the discharge port 112 of the rotor housing 110 are communicated with each other. For this purpose, an inlet 213 communicating with the discharge port 112 of the rotor housing 110 may be formed to extend from the side surface of the shaft receiving portion 212 to the upper side. That is, the inlet 213 may have a shape such as '┗' or '┛'.

The first inlet 213a and the second inlet 213b may be formed so as to face the inlet 213 so as to communicate with the first outlet 112a and the second outlet 112b. That is, the first inlet 213a and the second inlet 213b may be formed on both sides of the shaft receiving portion 212, respectively.

A main outlet 214 through which the fluid flows is formed on the side surface of the impeller receiving portion 211 by the rotation of the impeller 220.

The impeller 220 is received in the impeller receiving portion 211 and is axially coupled to the end of the second eccentric shaft 132 of the eccentric drive shaft 130. Therefore, the impeller 220 rotates by the rotation of the eccentric drive shaft 130, and rotates together with the rotor 120.

In the present invention, the motor 140 and the rotor housing 110 are directly coupled to each other so that the rotation axis 141 of the motor and the eccentric drive shaft 130 are coupled to each other. As shown in FIG. 7, The damping chamber 300 may be further provided between the rotor housing 110 and the rotor housing 110. FIG. 7 shows a cross-sectional view taken along line DD in FIG. 2. FIG. A solid line arrow in FIG. 7 shows the flow of fluid introduced through the main inlet.

The damping chamber 300 has a main inlet 310 at one side thereof and a buffer space for receiving the fluid introduced therein. The damping chamber 300 has a rotation axis 141 of the motor 140 through the center thereof.

A channel 320 communicating with the inlet port 111 of the rotor housing 110 is formed on the bottom surface of the damping chamber 300.

It is preferable that when the suction port 111 is formed of a pair of the first suction port 111a and the second suction port 111b as described above, the channel 320 is also connected to the first suction port 111a And a second channel 322 communicating with the channel 321 and the second suction port 111b.

Generally, when the fluid is sucked into the first suction port 111a and the second suction port 111b, the ripple phenomenon is greater than when one suction port is used. Therefore, by providing the damping chamber 300, By reducing the passage to one main inlet 310 of the damping chamber 300, the pulsation is reduced.

Since the inflow fluid is buffered in the buffer space of the damping chamber 300, pulsation is further reduced when the fluid flows into the rotor housing 110 through the first channel 321 and the second channel 322 .

The fluid sucked into the rotor housing 110 is discharged through the discharge port 112 by pumping. The discharged fluid flows into the mixing chamber 210 and is rotated by the impeller 220, And is discharged through the main outlet 214 by the rotation of the impeller 220 while being mixed in the main body 211.

Hereinafter, the operation of the present invention will be described.

When the motor 140 is driven, the rotation shaft 141 rotates and the eccentric drive shaft 130 connected thereto starts to rotate.

The eccentric rotation of the eccentric drive shaft 130 causes the rotor 120 to eccentrically rotate along a locus in the pumping space of the rotor housing 110 to start pumping.

A negative pressure is generated in the damping chamber 300 communicated with the first suction port 111a and the second suction port 111b so that the fluid flows into the damping chamber 300 through the main inlet port 310, And the fluid is sucked into the first and second suction ports 111 through the first and second channels 320 to be pumped.

It should be noted that even if the fluid is not continuously sucked into the first and second suction ports 111 of the rotor housing 110 and the suction is intermittently performed at regular intervals, the main inlet port 310 and the first and second suction ports 111 The damping chamber 300 has a buffer function, so that the pulsation can be largely reduced at the time of inhalation.

The fluid pumped from the rotor housing 110 is discharged through the first and second discharge ports 112 and flows into the mixing chamber 210 through the first and second inlet ports 213.

The fluid introduced into the mixing chamber 210 flows into the impeller receiving portion 211 through the shaft receiving portion 212 and is filled. At this time, since the impeller 220 is rotated by the eccentric drive shaft 130, the fluid finally flows out through the main outlet 214.

Note that the fluid is mixed by the impeller 220 in the impeller receiving portion 211 to cancel the pulsation. That is, the pulsating pressure of the fluid discharged at regular intervals is canceled by colliding with each other in the impeller accommodating portion 211, so that the secondary pulsation phenomenon is remarkably lowered.

The impeller 220 can further reduce the pulsation by controlling the number of the blades, and can also provide a stable supply of the flow rate and the pressure through the secondary drive of the impeller 220. It is also possible to increase the rotational force of the impeller 220 by acting on the blade to the pressure of the inflowing fluid.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention may be embodied in many other specific forms without departing from the spirit or essential characteristics thereof. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be determined by the scope of the appended claims, as well as the appended claims.

100: Triangular rotary pump 110: Rotor housing
111: inlet port 111a: first inlet port
111b: second suction port 112: discharge port
112a: first discharge port 112b: second discharge port
120: rotor 130: eccentric drive shaft
131: first eccentric shaft 132: second eccentric shaft
140: motor 141: rotating shaft
200: Pulse reduction means
210: mixing chamber 211: impeller accommodating portion
212: shaft receiving portion 213: inlet
213a: first inlet 213b: second inlet
214: main outlet 220: impeller
300: damping chamber
310: main inlet 320: channel
321: first channel 322: second channel

Claims (4)

A rotor housing having a pumping space formed therein with an epicycloidal locus and having a suction port formed at one side thereof and a discharge port formed at the other side thereof; a rotor having a round triangular shape and eccentrically rotating in a state where three vertexes are in contact with each other in the pumping space; A crankshaft-shaped eccentric drive shaft rotatably coupled to the center of the rotor, and a motor for rotating the eccentric drive shaft,
On the lower surface of the rotor housing,
A mixing chamber communicating with the discharge port is provided, and an impeller rotatably coupled to the eccentric drive shaft is provided in the mixing chamber,
And the pulsation of the triangular rotary pump is reduced by mixing the fluid introduced into the mixing chamber through the discharge port. The method according to claim 1,
Wherein the mixing chamber comprises:
An impeller accommodation portion in which the impeller is accommodated and a main outlet is formed on a side thereof, an axis accommodating portion communicated with the impeller accommodating portion and through which the eccentric drive shaft passes, and an inlet communicating the shaft accommodating portion and the discharge port And a pulsation reducing means for reducing the pulsation of the rotary pump. 3. The method according to claim 1 or 2,
Wherein the rotor housing has a first suction port and a second discharge port formed at one side thereof and a first discharge port and a second suction port formed at the other side thereof. The method of claim 3,
Between the motor and the rotor housing,
And a damping chamber in which a first channel and a second channel are formed, the main channel and the second channel communicating with the first inlet and the second inlet, respectively. Triangular rotary pump.

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