KR101748419B1 - Twin circle positive-displacement pump equipped with check valve - Google Patents

Abstract

The present invention relates to a two-way volumetric pump having a check valve, comprising: a housing having an upper volume chamber and a lower volume chamber communicated in an up-and-down direction and having fluid inlets and outlets formed on both sides thereof; A rotary shaft including an upper rotary shaft and a lower rotary shaft which rotate in opposite directions in the upper and lower volume chambers respectively; An eccentric rotor including an upper eccentric rotor and a lower eccentric rotor in which the upper rotary shaft and the lower rotary shaft are eccentrically inserted and rotated, respectively; An upper cylindrical member and a lower cylindrical member accommodating therein the upper eccentric rotor and the lower eccentric rotor, respectively, and inserting and moving in the upper and lower volume chambers, respectively, and a lower cylindrical member and a lower cylindrical member, A cylindrical member including a diaphragm for interlocking with each other; And a bearing provided between the upper cylindrical member and the upper eccentric rotor and between the lower cylindrical member and the lower eccentric rotor, wherein the inlet is opened when the inside of the housing is in negative pressure, A first check valve is provided to prevent the fluid from flowing backward along the gap formed between the upper cylindrical member and the upper volume chamber or between the lower cylindrical member and the lower volume chamber.

Description

[0001] The present invention relates to a double circle positive-displacement pump equipped with a check valve,

The present invention relates to a two-dimensional volumetric pump, and more particularly, to a two-dimensional volumetric pump in which fluid is pumped by a change in volume caused by an upper rotor and a lower rotor rotating in an inward reciprocating motion in opposite directions in an upper volume chamber and a lower volume chamber .

The pump is a mechanical device that transports fluid of a liquid or a gas through a pipe by a pressure action, or pushes a fluid in a low-pressure container through a pipe to a high-pressure container.

Pumps can be classified as reciprocating pumps, rotary (rotary) pumps, centrifugal pumps, axial pumps, friction pumps, etc. when structurally classified.

Among these pumps, the rotary pump is configured such that the piston acting on the piston acts on the piston while the piston acts on the piston by the rotor (rotor), and can be used for various purposes, and is widely used as a hydraulic pump for automatic control .

There are various rotary pumps according to their structures. Among them, Patent Documents 1 to 3 are technologies related to twin or tandem rotary pumps.

The problems of the conventional tandem rotary pump will be described with reference to FIGS. 1 and 2. FIG. FIG. 1 is a cross-sectional view of a conventional rotary pump, and FIG. 2 is an operational state diagram showing reverse flow of fluid in one rotation of upper and lower eccentric rotors in the rotary pump shown in FIG.

1, a rotary pump includes a housing 100 having upper and lower volume chambers 100a, 100b and an inlet (i) and an outlet (o) An upper rotor Ru accommodated in the upper volume chamber and eccentrically rotated; and a lower rotor Rd housed in the lower volume chamber and rotating in a reverse direction to the upper rotor. At this time, the upper rotor and the lower rotor are symmetrical with respect to each other and have the same structure.

The upper rotor Ru includes an upper cylindrical member 400a and a lower eccentric rotor 300a rotatably installed inside the upper cylindrical member. The lower rotor Rd includes a lower cylindrical member 400b and a lower eccentric rotor 300b rotatably installed in the lower cylindrical member.

However, the upper cylindrical member constituting the upper rotor and the lower cylindrical member constituting the lower rotor are connected to each other by the diaphragm 400c, and the upper rotor and the lower rotor can be inscribed in opposite directions to each other.

At this time, the upper and lower volume chambers have a circular shape, and the outer and inner circumferential surfaces of the upper and lower cylindrical members are also circular. The outer peripheral surface of the upper and lower eccentric rotors is also circular.

On the other hand, the upper and lower eccentric rotors are inserted and fixed to rotary shafts 200a and 200b for transmitting rotary power from the rotary shaft. That is, the rotary shaft is inserted eccentrically to one side rather than the center of the upper and lower eccentric rotors, and is coupled to each other using a shaft coupling element such as a key.

In such a structure, a cylindrical bearing 500 is inserted and interposed between each eccentric rotor and each of the cylindrical members to reduce friction between the eccentric rotors and the respective cylindrical members. The bearing usually uses a rolling means using a ball or a rolling element.

Fig. 2 (a) is a sectional view showing a state in which the rotating shaft is aligned in line with the diaphragm in an initial state, Fig. 2 (b) is a sectional view showing the state in which the upper rotating shaft rotates 90 degrees clockwise, FIG. 2 (c) is a cross-sectional view showing a state in which the upper rotary shaft rotates 180 degrees in the clockwise direction and the lower rotary shaft rotates 180 degrees in the counterclockwise direction, FIG. 2 (d) 270 degrees in the clockwise direction, and 270 degrees in the counterclockwise direction in the lower rotation axis.

the upper eccentric rotor rotates in the clockwise direction and the lower eccentric rotor rotates in the counterclockwise direction from the initial state as shown in Fig. Accordingly, the upper rotor (upper cylindrical member) pushes the fluid flowing into the inlet port while rotating in a clockwise direction in contact with the inner circumferential surface of the upper volume chamber, and the lower rotor (lower cylindrical member) So that the fluid flowing into the inlet is pushed and transferred to the outflow port in the same manner.

(B), the upper rotor reaches the 3 o'clock position, and the fluid is pushed out to the outflow port, and the space is generated at the 9 o'clock side of the opposite side, and the pressure is lowered to the negative pressure (-) state, ≪ / RTI > As the lower rotor reaches the 9 o'clock direction, the fluid is transferred to the outlet side, and a space is formed at the 9 o'clock direction, so that the fluid also enters the negative pressure state from the inlet port.

(c), the upper rotor reaches the 6 o'clock position, and all of the fluid in the 3 o'clock direction is discharged and charged with the newly introduced fluid, and the lower rotor reaches the 6 o'clock position, The fluid is continuously pushed out to the outflow port, and at the same time, a new fluid flows in at 9 o'clock.

(d), the upper rotor pushes the newly introduced fluid to the 3 o'clock position, and the lower rotor pushes out all the fluid at the 3 o'clock position.

After returning to the initial state as shown in (a), the upper rotor pushes the fluid at the 3 o'clock direction and discharges the fluid at the 3 o'clock direction because a negative pressure is generated at the 9 o'clock direction and a new fluid is introduced. The fluid is filled with the newly introduced fluid.

This cycle is repeated and the pumping is done quickly.

However, since the upper rotor and the lower rotor are in close contact with the inner circumferential surface of the upper and lower volume chambers, the fluid is pumped smoothly because there is no loss of pressure. In the case of (a) or (c) Pressure leakage occurs.

That is, in (c), since the upper clearance is generated between the lower surface of the upper rotor and the inner peripheral surface of the upper volume chamber, the fluid between the lower rotor and the lower volume chamber must be discharged through the outflow port, Suo) to flow into the upper volume chamber while flowing backward. In addition, due to the upper Sui of the inlet side, the pressure in the lower volume chamber is increased, which causes a problem that the inflow of the fluid from the inlet is not smooth.

Further, in (a), since a lower clearance is generated between the upper surface of the lower rotor and the inner peripheral surface of the lower volumetric chamber, the fluid between the upper rotor and the upper volumetric chamber must be discharged through the outlet, To the lower volume chamber. Further, due to the lower gap (Sdi) at the inlet side, the pressure in the upper volume chamber is increased, which causes a problem that the inflow of the fluid from the inlet is not smooth.

- Korean Patent No. 10-0801247 - Korean Patent No. 10-0876547 - Korean Patent No. 10-1621067

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 method and an apparatus for preventing leakage and backflow of pressure due to clearances generated between an inner circumferential surface of an upper volume chamber and an upper cylindrical member, And a check valve which can prevent the check valve.

To achieve the above object, according to the present invention, there is provided a double-row volumetric pump provided with a check valve, comprising: a housing having an upper volume chamber and a lower volume chamber communicated in an up-and-down direction and having an inlet port and an outlet port; A rotary shaft including an upper rotary shaft and a lower rotary shaft which rotate in opposite directions in the upper and lower volume chambers respectively; An eccentric rotor including an upper eccentric rotor and a lower eccentric rotor in which the upper rotary shaft and the lower rotary shaft are eccentrically inserted and rotated, respectively; An upper cylindrical member and a lower cylindrical member accommodating therein the upper eccentric rotor and the lower eccentric rotor, respectively, and inserting and moving in the upper and lower volume chambers, respectively, and a lower cylindrical member and a lower cylindrical member, A cylindrical member including a diaphragm for interlocking with each other; And a bearing provided between the upper cylindrical member and the upper eccentric rotor and between the lower cylindrical member and the lower eccentric rotor, wherein the inlet is opened when the inside of the housing is in negative pressure, A first check valve is provided to prevent the fluid from flowing backward along the gap formed between the upper cylindrical member and the upper volume chamber or between the lower cylindrical member and the lower volume chamber.

According to another embodiment of the present invention, there is provided a vacuum cleaner comprising: a housing having an upper volume chamber and a lower volume chamber communicated in an up-and-down direction and having fluid inlets and outlets formed on both sides thereof; A rotary shaft including an upper rotary shaft and a lower rotary shaft which rotate in opposite directions in the upper and lower volume chambers respectively; An eccentric rotor including an upper eccentric rotor and a lower eccentric rotor in which the upper rotary shaft and the lower rotary shaft are eccentrically inserted and rotated, respectively; An upper cylindrical member and a lower cylindrical member accommodating therein the upper eccentric rotor and the lower eccentric rotor, respectively, and inserting and moving in the upper and lower volume chambers, respectively, and a lower cylindrical member and a lower cylindrical member, A cylindrical member including a diaphragm for interlocking with each other; And a bearing provided between the upper cylindrical member and the upper eccentric rotor and between the lower cylindrical member and the lower eccentric rotor, wherein the outlet is open when the inside of the housing is a positive pressure, The second check valve is provided to prevent the fluid from flowing backward along the gap formed between the upper cylindrical member and the upper volume chamber or between the lower cylindrical member and the lower volume chamber.

According to another embodiment of the present invention, there is provided a vacuum cleaner comprising: a housing having an upper volume chamber and a lower volume chamber communicated in an up-and-down direction and having fluid inlets and outlets formed on both sides thereof; A rotary shaft including an upper rotary shaft and a lower rotary shaft which rotate in opposite directions in the upper and lower volume chambers respectively; An eccentric rotor including an upper eccentric rotor and a lower eccentric rotor in which the upper rotary shaft and the lower rotary shaft are eccentrically inserted and rotated, respectively; An upper cylindrical member and a lower cylindrical member accommodating therein the upper eccentric rotor and the lower eccentric rotor, respectively, and inserting and moving in the upper and lower volume chambers, respectively, and a lower cylindrical member and a lower cylindrical member, A cylindrical member including a diaphragm for interlocking with each other; And a bearing provided between the upper cylindrical member and the upper eccentric rotor and between the lower cylindrical member and the lower eccentric rotor, wherein the inlet is opened when the inside of the housing is in negative pressure, And a second check valve which is opened when the inside of the housing is a positive pressure and is blocked when the pressure is negative is provided in the outlet port so that a gap between the upper cylindrical member and the upper volume chamber or between the lower cylindrical member and the lower chamber, So that the fluid can be prevented from flowing backward along the clearance formed between the volume chambers.

Wherein the inlet has a first installation part as a space in which the first check valve is installed and a first venturi tube part having a shape in which the first installation part communicates with the inside of the housing and the sectional area is reduced, The valve includes a first fixing plate fixed to the inlet side of the first venturi tube and formed with a plurality of suction holes through which fluid can pass, a first support shaft inserted and inserted through the center of the first fixing plate, A first opening and closing plate coupled to an end of the support shaft for opening and closing the inlet side of the first installation portion and a first spring interposed between the first opening and closing plate and the first fixing plate and elastically supporting the outer periphery of the first support shaft, .

And the second check valve is a space communicating with the second venturi tube and being a space in which the second check valve is installed, the second check valve communicating with the inside of the housing and having a larger sectional area, A second fixing plate fixed to an outlet side of the second mounting portion and having a plurality of discharge holes through which fluid can pass, a second support shaft inserted and inserted into the center of the second fixing plate, And a second spring interposed between the second opening / closing plate and the second fixing plate and elastically supporting the outer periphery of the second supporting shaft, the second opening / closing plate being coupled to the second opening / closing plate and opening and closing the outlet side of the first venturi tube portion .

According to the present invention having the above-described configuration, by providing a check valve on the inlet side or the outlet side, an upper clearance between the upper cylindrical member and the inner circumferential surface of the upper volumetric chamber or a lower clearance between the lower cylindrical member and the inner circumferential surface of the lower volumetric chamber It is possible to prevent the pressure leakage and the back flow phenomenon.

1 is a cross-sectional view of a conventional rotary pump
Fig. 2 is an operating state diagram showing the back flow of the fluid according to one rotation of the upper and lower eccentric rotors in the conventional rotary pump shown in Fig. 1. Fig.
3 is a cross-sectional view showing a two-way volumetric pump with a check valve according to an embodiment of the present invention
4 is an operational state diagram showing a state in which the upper eccentric rotor is rotated by 90 degrees
5 is an operational state diagram showing a state in which the upper eccentric rotor is rotated 180 degrees
6 is an operational state diagram showing a state in which the upper eccentric rotor is rotated 270 degrees
7 is an operational state diagram showing a state in which the upper eccentric rotor is rotated 360 degrees (initial state)

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of a pump according to 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. In the following description, a detailed description of related arts will be omitted when it is determined that the gist of the present invention may be unnecessarily blurred.

3 is a cross-sectional view showing a two-way volumetric pump having a check valve according to an embodiment of the present invention.

Referring to the drawings, an embodiment of the present invention includes a housing 10, a rotary shaft 20, an eccentric rotor 30, a cylindrical member 40, and a bearing 50, A first check valve may be provided on the inlet side of the fluid or a second check valve may be provided on the outlet side of the fluid or a first check valve may be provided on the inlet side or a first check valve may be provided on the outlet side to solve the reverse flow phenomenon, 2 It is a technical feature to install a check valve.

First, the housing 10 is provided with an upper volume chamber 10a capable of receiving the upper cylindrical member 40a and a lower volume chamber 10b capable of receiving the lower cylindrical member 40b on the upper side thereof And the upper and lower volume chambers 10a and 10b communicate with each other.

The upper and lower volume chambers 10a and 10b have the same shape, so that the housing 10 can be vertically symmetrical as a whole.

On both sides of the housing 10, an inlet 11 through which fluid is sucked and an outlet 12 through which the fluid is discharged are formed.

At this time, the structure of the inlet may be divided into a first installation part 11a and a first venturi tube part 11b.

The first installation part 11a is a space in which a first check valve 60 to be described later can be installed. The first installation part 11a can be formed in a cylindrical shape on one side wall of the housing 10 and includes a suction pipe City).

The first venturi tube portion 11b may have a venturi tube shape in which the first installation portion 11a communicates with the inside of the housing and the cross-sectional area of the first venturi tube portion 11b gradually decreases with respect to the inflow direction of the fluid.

Meanwhile, the structure of the outlet 12 may be divided into a second installation part 12a and a second venturi tube part 12b.

The second venturi tube portion 12b may communicate with the interior of the housing 10 and may have a venturi tube shape in which the cross-sectional area gradually increases with respect to the discharge direction of the fluid.

The second installation part 12a is a space in which a second check valve 70 to be described later can be installed and is formed in a cylindrical shape on the other side wall surface of the housing 10 so as to communicate with the second venturi tube part 12b And may be connected to a discharge pipe (not shown) for discharging the fluid to be pumped.

Next, the upper rotary shaft 20a and the lower rotary shaft 20b are horizontally disposed in the upper and lower volume chambers 10a and 10b, respectively, and rotate in opposite directions.

At this time, the rotary shaft 20 is rotated by external power and is coupled with the upper eccentric rotor 30a and the lower eccentric rotor 30b, respectively, to rotate the eccentric rotors 30 in opposite directions.

The eccentric rotor 30 includes an upper eccentric rotor 30a coupled to the upper rotary shaft 20a and a lower eccentric rotor 30b coupled to the lower rotary shaft 20b.

The eccentric rotor 30 and the rotary shaft 20 may be axially coupled by a key-groove coupling method, but they are not limited thereto and may be mutually coupled by various shaft coupling methods.

When the rotary shaft 20 is inserted into the eccentric rotor 30, the eccentric rotor 30 is inserted into the eccentric rotor 30 such that it is eccentrically inserted into one side. Therefore, when the rotation shaft 20 rotates, the eccentric rotor 30 is eccentrically rotated as a cam.

Next, the cylindrical member 40 will be described.

The cylindrical member 40 includes an upper cylindrical member 40a that receives the upper eccentric rotor 30a and is received in the upper volume chamber 10a and a lower cylindrical member 40b that houses the lower eccentric rotor 30b, A lower cylindrical member 40b accommodated in the chamber 10b and a diaphragm 40c interconnecting the upper cylindrical member 40a and the lower cylindrical member 40b.

At this time, the upper cylindrical member 40a and the lower cylindrical member 40b may have circular inner cross-sections.

The upper cylindrical member 40a is disposed inside the upper volume chamber 10a and the lower cylindrical member 40b is accommodated within the lower volume chamber 10b in accordance with rotation of the eccentric rotor 30. [ And is brought into contact with and rotated.

Meanwhile, a bearing (50) is interposed between the upper cylindrical member and the upper eccentric rotor and between the lower cylindrical member and the lower eccentric rotor to reduce friction. The bearing may be a ball, a roller, or the like as a rolling means, or a flexible bearing may be used.

Next, the first check valve and the second check valve, which are technical features of the present invention, will be described.

First, the first check valve 60 opens the fluid sucked into the inlet 11 of the housing 10 only in the suction direction. That is, when the inside of the housing 10 is in a negative pressure (-) state due to a low pressure, the fluid is inhaled while the fluid is sucked. On the other hand, the back pressure causes the pressure inside the housing 10 to rise, It is blocked to prevent backflow of the fluid.

Specifically, the first check valve 60 is installed in the first mounting portion 11a and includes a first fixing plate 61, a first supporting shaft 62, a first opening / closing plate 63, a first spring 64).

The first fixing plate 61 fixes the first supporting shaft 62 and the first opening and closing plate 63 to the inside of the first mounting portion 11a and specifically to the first mounting portion 11a, And the first venturi tube portion 11b are connected to each other. To this end, a first seating step 65 on which the first fixing plate 61 can be seated may be formed in the stepped shape inside the outlet of the first mounting part 11a. A plurality of suction holes 61a may be formed at the center of the first fixing plate 61 so that the first support shaft 62 can pass therethrough and the fluid can pass around the holes. .

The first support shaft 62 is inserted into the center of the first fixing plate 61 and is not fixed to the first fixing plate 61 but is movably inserted.

The first opening / closing plate 63 is coupled to the end of the first support shaft 62. The first open / close plate 63 has a circular disk-like configuration capable of opening and closing the first installation part 11a, and is located at the inlet side of the first installation part 11a to suck or block the fluid.

Accordingly, a first latching protrusion 66 protruding inwardly from the inlet side of the first mounting portion 11a and engaged with the first opening / closing plate 63 may be formed. A sealing member (not shown) may be provided on the first latching protrusion 66 or the first opening / closing plate 63 to prevent fluid leakage.

A first spring 64 is interposed between the first opening / closing plate 63 and the first fixing plate 61. The first spring 64 is installed to surround the first support shaft 62 so that both ends of the first spring 64 elastically support the first opening / closing plate 63 and the first fixing plate 61, 63) is always closed. At this time, the first spring 64 has an appropriate elastic modulus and is compressed when the inside of the housing 10 is in a negative pressure (-) state, so that the first opening and closing plate 63 is opened and the fluid can be easily introduced .

Meanwhile, the outlet 12 may be provided with a second check valve 70.

The second check valve 70 is opened when the inside of the housing 10 is at a positive pressure (+) and blocked when the housing 10 is at a negative pressure (-), and is opened only when the fluid is discharged to the outlet 12. That is, when the inside of the housing 10 becomes higher in pressure and becomes a positive pressure (+) state, the fluid is discharged, while when the pressure inside the housing 10 becomes lower due to the back flow phenomenon, .

Specifically, the second check valve 70 is installed in the second mounting portion 12a. The second check valve 70 includes a second fixing plate 71, a second supporting shaft 72, a second opening / closing plate 73, 74).

The second fixing plate 71 fixes the second supporting shaft 72 and the second opening and closing plate 73 to the inside of the second mounting portion 12a and specifically to the inside of the second mounting portion 12a And is installed on the outlet side. To this end, a second seating step (75) on which the second holding plate (71) can be mounted may be protruded inside the outlet of the second mounting part (12a). A plurality of discharge holes 71a may be formed in the second fixing plate 71 so that the second support shaft 72 can pass therethrough and a fluid can pass around the holes. .

The second support shaft 72 is inserted into the center of the second fixing plate 71 and is not fixed to the second fixing plate 71 but is movably inserted.

The second opening / closing plate 73 is coupled to the end of the second support shaft 72. The second opening / closing plate 73 is a circular disk-shaped configuration capable of opening / closing the second venturi tube portion 12b, and is located at the inlet side of the second installation portion 12a, .

Therefore, a second latching protrusion 76 may be formed on the inlet side of the second mounting portion 12a so that the second latching protrusion 76 is engaged with the second opening / closing plate 73 in a stepped shape. A sealing member (not shown) may be provided on the second latching jaw 76 or the second opening / closing plate 73 to prevent fluid leakage.

A second spring (74) is interposed between the second opening / closing plate (73) and the second fixing plate (71). The second spring 74 is installed to surround the second support shaft 72 and has both ends elastically supporting the second opening / closing plate 73 and the second fixing plate 71, 73) is always closed. At this time, the second spring 74 has an appropriate elastic modulus, and when the inside of the housing 10 is in a positive (+) state, the second opening / closing plate 73 is opened and the fluid can be easily discharged .

Hereinafter, the operation of the present invention will be described in detail with reference to FIGS. 4, 5, 6 and 7 together. FIG. 4 is an operational state diagram showing a state in which the upper eccentric rotor is rotated by 90 degrees, FIG. 5 is an operating state in which the upper eccentric rotor is rotated 180 degrees, and FIG. Fig. 7 is an operational state diagram showing a state in which the upper eccentric rotor is rotated 360 degrees (initial state). In the drawing, light gray means a negative pressure state, and dark gray means a static pressure state. It should be noted that the description will be made on the basis of an embodiment in which both the first check valve and the second check valve are provided, but the description includes a case where a first check valve is provided only at the inlet port or a second check valve is provided only at the outlet port.

The upper eccentric rotor 30a and the lower eccentric rotor 30b are rotated in opposite directions as described in the general operation process in the background of the present invention.

4 shows a state in which the upper eccentric rotor 30a is rotated 90 degrees clockwise and the lower eccentric rotor 30b is rotated 90 degrees counterclockwise. That is, the upper cylindrical member 40a is located at 3 o'clock, and the lower cylindrical member 40b is located at 9 o'clock.

In this state, a negative pressure (-) is formed because the space of the upper and lower volume chambers 10a and 10b on the side of the inlet 11 becomes larger, so that a large amount of fluid is sucked. On the opposite side, The space of the chamber 10a and the lower volume chamber 10b is reduced and a positive pressure is formed so that the fluid filled in the lower volume chamber 10b is discharged through the outlet port 12. [

At this time, the first check valve (60) and the second check valve (70) are kept open. That is, the first spring 64 and the second spring 74 are compressed to open the first open / close board 63 and the second open / close board 73, thereby smoothly sucking and discharging the fluid.

5 shows a state in which the upper eccentric rotor 30a rotates 180 degrees clockwise and the lower eccentric rotor 30b rotates 180 degrees counterclockwise. That is, both the upper cylindrical member 40a and the lower cylindrical member 40b are located at 6 o'clock.

At this time, the first check valve (60) and the second check valve (70) are kept blocked. That is, the first spring 64 and the second spring 74 are inflated to close the first and second open / close plates 63 and 73 to stop the suction and discharge of the fluid.

This is because the gap between the lower cylindrical member 40b and the lower volumetric chamber 10b is lowered to the outflow port 12 because an upper clearance is generated between the lower surface of the upper cylindrical member 40a and the inner peripheral surface of the upper volume chamber 10a. But a part thereof flows backward into the upper volume chamber 10a through the upper side Suo of the outlet side. The second check valve 70 is closed because the pressure on the side of the outlet 12 is lowered and the positive pressure (+) can not be maintained.

Also, the pressure in the upper volume chamber 10a increases due to the fluid flowing backward into the upper volume chamber 10a, and the negative pressure (-) can not be maintained. The fluid in the upper volume chamber 10a flows backward into the lower volume chamber 10b due to the upper gap Sui on the inlet side so that the pressure in the lower volume chamber 10b also increases and the pressure of the inlet 11 as a whole increases, The first check valve 60 is also closed.

Therefore, the pressure of the inlet 11 is not increased any more, and the reverse flow is stopped at the outlet upper side Suo, so that the conventional problems are solved.

6 shows a state in which the upper eccentric rotor 30a is rotated 270 degrees clockwise and the lower eccentric rotor 30b is rotated 270 degrees counterclockwise. That is, the upper cylindrical member 40a is located at 9 o'clock, and the lower cylindrical member 40b is located at 3 o'clock.

In this state, a negative pressure (-) is formed due to a large space in the lower volume chamber 10b and the upper volume chamber 10a on the side of the inlet port 11, so that a large amount of fluid is sucked. On the opposite side, The space of the chamber 10a and the lower volume chamber 10b is reduced and a positive pressure is formed so that the fluid filled in the upper volume chamber 10a is discharged through the outflow port 12. [

At this time, the first check valve (60) and the second check valve (70) are kept open.

That is, the first spring 64 and the second spring 74 are compressed, and the first opening / closing plate 63 and the second opening / closing plate 73 are opened to smoothly suck and discharge the fluid.

7 shows a state in which the upper eccentric rotor 30a rotates 360 degrees clockwise and the lower eccentric rotor 30b rotates 360 degrees counterclockwise, that is, the initial state. That is, both the upper cylindrical member 40a and the lower cylindrical member 40b are located at 12 o'clock.

At this time, the first check valve (60) and the second check valve (70) are kept blocked. That is, the first spring 64 and the second spring 74 are inflated to close the first and second open / close plates 63 and 73 to stop suction and discharge of the fluid.

This is because the lower clearance is generated between the upper surface of the lower cylindrical member 40b and the inner peripheral surface of the lower volumetric chamber 10b so that the fluid between the upper cylindrical member 40a and the upper volumetric chamber 10a flows into the outflow port 12, But a part of the air flows into the lower volume chamber 10b while flowing backward through the lower outlet space Sdo. The second check valve 70 is closed because the pressure on the side of the outlet 12 is lowered and the positive pressure (+) can not be maintained.

In addition, the pressure in the lower volume chamber 10b becomes higher due to the fluid flowing backward into the lower volume chamber 10b, and the negative pressure (-) can not be maintained. A part of the fluid in the lower volume chamber 10b flows back to the upper volume chamber 10a due to the lower port Sdi of the inlet port side so that the pressure in the upper volume chamber 10a also increases and the pressure of the inlet port 11 as a whole increases, The first check valve 60 is also closed.

Therefore, the pressure of the inlet 11 is not increased any more and the reverse flow is stopped at the outlet-side lower clearance Sdo, so that the conventional problems are solved and the pumping efficiency can be improved.

While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments.

10: Housing
10a: upper volume chamber 10b: lower volume chamber
11: inlet 11a: first installation part
11b: first venturi tube portion 12: outlet
12a: second mounting portion 12b: second venturi tube portion
20:
20a: upper rotating shaft 20b: lower rotating shaft
30: Eccentric rotor
30a: upper eccentric rotor 30b: lower eccentric rotor
40: cylindrical member 40a: upper cylindrical member
40b: lower cylindrical member 40c: diaphragm
50: Bearings
60: first check valve
61: first fixing plate 61a: suction hole
62: first supporting shaft 63: first opening / closing plate
64: first spring 65: first seating chin
66: first stopping jaw
70: second check valve
71: second fixing plate 71a: discharge hole
72: second support shaft 73: second opening / closing plate
74: second spring 75: second seating jaw
76: second stop jaw

Claims (5)

A housing having an upper volume chamber and a lower volume chamber communicated with each other in the upper and lower sides and having an inlet port and an outlet port on both sides adjacent to the upper and lower volume chambers; A rotary shaft including an upper rotary shaft and a lower rotary shaft which rotate in opposite directions in the upper and lower volume chambers respectively; An eccentric rotor including an upper eccentric rotor and a lower eccentric rotor in which the upper rotary shaft and the lower rotary shaft are eccentrically inserted and rotated, respectively; An upper cylindrical member and a lower cylindrical member accommodating therein the upper eccentric rotor and the lower eccentric rotor, respectively, and inserting and moving in the upper and lower volume chambers, respectively, and a lower cylindrical member and a lower cylindrical member, A cylindrical member including a diaphragm for interlocking with each other; And a bearing provided between the upper cylindrical member and the upper eccentric rotor and between the lower cylindrical member and the lower eccentric rotor,
A negative pressure is formed in the space between the housing and the cylindrical member, which is formed on the inlet side as the eccentric rotor rotates,
When the upper eccentric rotor and the lower eccentric rotor are located at 6 o'clock or 12 o'clock direction, the fluid flows backward along the clearance formed between the upper cylindrical member and the upper volume chamber or between the lower cylindrical member and the lower volume chamber Wherein the first check valve is provided to shut off the inlet port to prevent the check valve from being opened. A housing having an upper volume chamber and a lower volume chamber communicated with each other in the upper and lower sides and having an inlet port and an outlet port on both sides adjacent to the upper and lower volume chambers; A rotary shaft including an upper rotary shaft and a lower rotary shaft which rotate in opposite directions in the upper and lower volume chambers respectively; An eccentric rotor including an upper eccentric rotor and a lower eccentric rotor in which the upper rotary shaft and the lower rotary shaft are eccentrically inserted and rotated, respectively; An upper cylindrical member and a lower cylindrical member accommodating therein the upper eccentric rotor and the lower eccentric rotor, respectively, and inserting and moving in the upper and lower volume chambers, respectively, and a lower cylindrical member and a lower cylindrical member, A cylindrical member including a diaphragm for interlocking with each other; And a bearing provided between the upper cylindrical member and the upper eccentric rotor and between the lower cylindrical member and the lower eccentric rotor,
And a static pressure is formed in the space between the housing and the cylindrical member formed on the outlet side of the eccentric rotor as the eccentric rotor rotates,
When the upper eccentric rotor and the lower eccentric rotor are located at 6 o'clock or 12 o'clock direction, the fluid flows backward along the clearance formed between the upper cylindrical member and the upper volume chamber or between the lower cylindrical member and the lower volume chamber And a second check valve for shutting off the outlet so as to prevent the outlet of the check valve. A housing having an upper volume chamber and a lower volume chamber communicated with each other in the upper and lower sides and having an inlet port and an outlet port on both sides adjacent to the upper and lower volume chambers; A rotary shaft including an upper rotary shaft and a lower rotary shaft which rotate in opposite directions in the upper and lower volume chambers respectively; An eccentric rotor including an upper eccentric rotor and a lower eccentric rotor in which the upper rotary shaft and the lower rotary shaft are eccentrically inserted and rotated, respectively; An upper cylindrical member and a lower cylindrical member accommodating therein the upper eccentric rotor and the lower eccentric rotor, respectively, and inserting and moving in the upper and lower volume chambers, respectively, and a lower cylindrical member and a lower cylindrical member, A cylindrical member including a diaphragm for interlocking with each other; And a bearing provided between the upper cylindrical member and the upper eccentric rotor and between the lower cylindrical member and the lower eccentric rotor,
Wherein the first check valve is provided at the inlet and formed with a negative pressure in a space between the housing and the cylindrical member formed on the inlet side as the eccentric rotor rotates, And a second check valve formed in the space between the housing and the cylindrical member,
Wherein the first check valve and the second check valve are disposed between the upper cylindrical member and the upper volume chamber or between the lower cylindrical member and the lower volume chamber when the upper eccentric rotor and the lower eccentric rotor are positioned at 6 o'clock or 12 o'clock, Wherein the inlet and the outlet are blocked to prevent the fluid from flowing back along the clearance formed between the inlet and the outlet. 4. The method according to any one of claims 1 to 3,
Wherein the inlet has a first mounting portion that is a space in which the first check valve is installed and a first venturi tube portion that has a shape in which the first mounting portion communicates with the inside of the housing and the sectional area thereof is reduced,
Wherein the first check valve comprises:
A first fixing plate that is fixed to an inlet side of the first venturi tube and has a plurality of suction holes through which fluids can pass; a first support shaft inserted and inserted into the center of the first fixing plate; And a first spring interposed between the first opening / closing plate and the first fixing plate and elastically supporting the outer periphery of the first supporting shaft, the first opening / closing plate being coupled to the first opening / closing plate and opening / Wherein the check valve is provided with a check valve. 4. The method according to any one of claims 2 to 3,
Wherein the outlet has a second venturi tube portion communicating with the inside of the housing and having a larger sectional area and a second installation portion communicating with the second venturi tube portion and being a space in which the second check valve is installed,
The second check valve
A second fixing plate fixed to the outlet side of the second mounting portion and having a plurality of discharge holes through which fluid can pass; a second support shaft inserted and inserted into the center of the second fixing plate; And a second spring interposed between the second opening / closing plate and the second fixing plate to elastically support the outer periphery of the second supporting shaft, the second opening / closing plate being coupled to the opening and closing the outlet side of the second venturi tube portion, Wherein the check valve is provided with a check valve.

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