KR100618949B1 - Positive displacement pump having a idle piston - Google Patents

Abstract

Volumetric pump with idle piston according to the present invention is the lower drive piston 120 by the drive shaft 110 in the eccentric inward movement in the lower volume chamber 131 of the casing 130, the upper portion of the casing 130 The upper idle piston 140 disposed in the volume chamber 133 is connected by the lower driving piston 120 and the connecting member 150, and in the upper volume chamber 133 by the operation of the lower driving piston 120. In the volumetric pump for eccentric inward movement with respect to the idling shaft 160, a clutch bearing 170 is mounted on the idling shaft 160, so that the upper idle piston 140 is casing in only one direction. It is characterized in that the eccentric inward movement in the upper volume chamber 133 of 130).

Description

Positive displacement pump having a idle piston

1 is a side view showing a volumetric pump with an idle piston according to a first embodiment of the present invention

FIG. 2 is a cross-sectional view taken along line A-A of FIG. 1 showing the volumetric pump with idle piston of FIG.

3A to 3C are schematic views showing a process in which the lower drive piston and the upper idle piston are operated in FIG.

4 is a front view showing a volumetric pump with an idle piston according to a second embodiment of the present invention.

5 is a cross-sectional view taken along the line B-B of FIG.

6 is a cross-sectional view taken along the line C-C of FIG.

7 is a cross-sectional view taken along the line D-D of FIG.

The present invention relates to a volumetric pump with an idle piston, and more particularly, an upper idler in which the lower drive piston moves eccentrically in the lower volume chamber by a drive shaft and is connected by the lower drive piston and a connecting member. The piston is mounted on the idling shaft to perform eccentric inward movement in the upper volume chamber by the operation of the lower drive piston, and the clutch bearing is mounted on the idling shaft, so that the upper idle piston moves eccentrically in only one direction. A volumetric pump with an idle piston.

Korean Patent No. 123296 (registered on September 12, 1997) introduces a "twin cylinder pump".

The bicylinder pump comprises a pair of identical cylindrical bodies having the same eccentricity with respect to each axis and pivoting in opposite directions with substantially equal distances around these axes, And a pair of equal cylindrical first and second slide bodies in which the outer circumferential surface is inscribed in the circumferential direction, respectively, and a diaphragm connecting between the two slide bodies.

However, the cylindrical pump has a lower shaft and an upper shaft in a gear connection structure, so that when the first slide and the second slide are disposed in a diagonal direction of 45 °, the first slide and the second slide are respectively separated. It is impossible to inscribe the slide body room. In order to overcome this problem, the lower and upper shafts are connected to the eccentric gears, but the tolerance due to the backlash of the gears and the gear wear is greatly generated, resulting in the internal clearance and the volume effect is greatly reduced or the volume effect is lost.

In order to compensate for this, the outer circumferential surface of the slide body is covered with an elastic body such as rubber, but has a short service life due to rapid wear of the elastic body.

Accordingly, an object of the present invention is to mount a clutch bearing on an idling shaft on which an upper idle piston is mounted, so that the upper idle piston connected by the lower drive piston and the connecting member can perform an eccentric inward movement in either direction in the upper volume chamber. In this way, while each piston in the upper and lower volume chambers pumping as in the prior art, there is no gear and no gearbox, thereby reducing the components and providing a volumetric pump with an idle piston that is easy to assemble.

SUMMARY OF THE INVENTION An object of the present invention is to provide an idle piston having an extended service life by allowing the piston housings of the lower drive piston and the upper idle piston to have a uniform inward motion on the inner circumferential surface of the volume chamber directly within a mechanical allowable hole without an elastic body such as rubber. To provide a volumetric pump.

Preferred embodiments of the present invention for achieving the above object will be described in detail with reference to the drawings.

1 and 2, the volumetric pump with an idle piston according to the first embodiment of the present invention is a lower volume chamber 131 of the casing 130 by the lower drive piston 120 by the drive shaft 110. 2, an eccentric inward movement, and an upper idle piston 140 disposed in the upper volume chamber 133 of the casing 130 is connected by the lower driving piston 120 and the connecting member 150. By the operation of the lower drive piston 120, in the upper volume chamber 133 is to perform an eccentric inward movement around the idling shaft 160.

In addition, in the displacement pump with the idle piston, as shown in FIG. 1, the clutch bearing 170 is mounted on the idling shaft 160, so that the upper idle piston 140 is casing (in either direction). In the upper volume chamber 133 of 130, an eccentric inward movement is performed.

The clutch bearing 170 is embedded in a bearing housing 180 mounted on the rear plate 135 of the casing 130, and a mechanical seal 190 is disposed between the bearing housing 180 and the idling shaft 160. Disposed to seal between the upper volume chamber 160 and the bearing housing 180.

The lower drive piston 120 has a first piston housing 121 is connected to the second piston housing 141 of the upper idle piston 140 by a connecting member 150, the first piston housing 121 The first bearing 123 is mounted on the inner circumferential surface, the first eccentric ring 125 is mounted on the hollow portion of the first bearing 123, and the drive shaft 110 is fitted to the first eccentric ring 125. Lose.

Like the lower driving piston 120, the upper idle piston 140 is also equipped with a second bearing 143 on the inner circumferential surface of the second piston housing 141, and has a second eccentricity in the hollow portion of the second bearing 143. A ring 145 is mounted, and an idling shaft 160 is fitted to the second eccentric ring 145.

The connection member 150 has a function of connecting the lower driving piston 120 and the upper idle piston 140 as well as prevents the inlet 137 and the outlet 139 from directly communicating with the piston 120. , 140 acts to form a vacuum between the piston (120, 140) and the suction port 137 when the eccentric inward movement in the lower chamber 131 and the upper chamber 133 of the casing (130) .

The operation of the volumetric pump with idle piston according to the first embodiment of the present invention configured as described above will be described with reference to FIGS. 2 and 3A to 3C.

As shown in FIG. 2, the first eccentric is caused by rotation of the drive shaft 110 in a state where the pistons 120 and 140 are disposed at 270 ° positions of the lower volume chamber 131 and the upper volume chamber 133 of the casing 130. When the nose portion 125a of the ring 125 is rotated counterclockwise, as shown in FIG. 3A, the nose portion 125a of the first eccentric ring 125 is used to control the lower drive piston 120. 1 piston housing 121 is moved to the position of 180 ° of the lower volume chamber (131).

At this time, the upper idle piston 140 is the second piston housing 141 is connected to the first piston housing 121 by the connecting member 150, the clutch bearing 170 is mounted on the idling shaft 160 Since the second eccentric ring 145 of the upper idle piston 140 can rotate only in the counterclockwise direction by the clutch bearing 170, the second piston connected to the first piston housing 121. The housing 141 is moved to the 90 ° position of the upper volume chamber 133 by the force of the first piston housing 121.

Thereafter, the operation of the lower drive piston 120 and the upper idle piston 140 is rotated as shown in FIGS. 3b and 3c to repeat the process of returning to the state of FIG.

By this action, the pumped water is sucked into the suction port 137 and then pumped out through the discharge port 139.

In the volumetric pump with idle piston according to the first embodiment of the present invention constructed and operated as described above,

Referring to FIG. 2, the outer circumferential surface of the first piston housing 121 of the lower drive piston 120 and the second piston housing 141 of the upper idle piston 140 are directly made of steel without an elastic body such as rubber. The inner peripheral surface of the chamber 131 and the inner peripheral surface of the upper volume chamber 133 are in close contact with each other.

When the first piston housing 121 and the second piston housing 141 made of steel are in direct contact with the inner circumferential surface of the lower volume chamber 131 and the inner circumferential surface of the upper volume chamber 133, respectively, the degree of vacuum during the pumping motion Is slightly lowered but does not affect the sludge pumping, the outer circumferential surfaces of the first piston housing 121 and the second piston housing 141 is not worn well, and the service life is significantly extended.

Referring to FIG. 4, in the volumetric pump having an idle piston according to the second embodiment of the present invention, four volume chambers 211, 213, 215, and 217 are formed in the casing 210, and the first volume chamber ( The first piston 221 disposed in the 211 and the second piston 223 disposed in the second volume chamber 213 are connected by the connecting member 231 to be mounted on the first piston 221. The first piston 221 and the second piston 223 are actuated by the drive shaft 241, and are arranged in the third piston 225 and the fourth volume chamber 217 arranged in the third volume chamber 215. The fourth piston 227 is connected by the connecting member 235, the third piston 225 and the fourth piston 227 by the second drive shaft 245 mounted to the third piston 225. And the first piston 221, the second piston 223, the third piston 225, and the fourth piston 227 are 90 ° out of phase with each other in the respective volume chambers 211, 213, 215, 217. It is arranged to have.

5 and 6, the displacement pump with the idle piston has a clutch bearing 251 (see FIG. 5) mounted to the idling shaft 243 of the second piston 223, and the fourth piston ( The clutch bearing 253 is mounted to the idling shaft 247 of 227.

In addition, referring to FIG. 7, in the displacement pump with the idle piston, the first drive shaft 241 and the second drive shaft 245 are connected by the gears 261, and thus the first drive shaft 241. Power is transmitted to the second drive shaft 245.

As a result, the pump having the idle piston has the same pumping principle as that of the volume pump with the idle piston of the first embodiment, and the pumped object sucked into the inlet port 219a has the respective pistons 221, 223, 225, and 227. Is pumped to the outlet 219b, but the pulsation of the pumped fluid can be reduced than in the first embodiment.

As described above, the volumetric pump with idle piston according to the present invention is equipped with a clutch bearing on an idling shaft on which the upper idle piston is mounted, such that the upper idle piston connected by the lower drive piston and the connecting member in the upper volume chamber. By allowing eccentric inward movement in one direction, each piston in the upper and lower volume chambers pumps as in the prior art, so there are no gears and no gearbox, which reduces components, and is easy to assemble. By allowing the piston housings of the lower drive piston and the upper idle piston to be inscribed directly on the inner circumferential surface of the volume chamber without an elastic body such as rubber, the service life is extended.

Claims (4)

The lower driving piston 120 makes the eccentric inward movement in the lower volume chamber 131 of the casing 130 by the drive shaft 110, and the upper idle piston (133) disposed in the upper volume chamber 133 of the casing 130 ( 140 is connected by the lower drive piston 120 and the connecting member 150, the eccentric inward movement about the idling shaft 160 in the upper volume chamber 133 by the operation of the lower drive piston 120. In the volumetric pump, The clutch bearing 170 is mounted on the idling shaft 160, so that the upper idle piston 140 performs eccentric inward movement in the upper volume chamber 133 of the casing 130 only in one direction. Volumetric pump with idle piston. The method of claim 1, The clutch bearing 170 is embedded in a bearing housing 180 mounted on the rear plate 135 of the casing 130, and is disposed between the bearing housing 180 and the idling shaft 160 so that the upper volume chamber 160 is disposed. And a mechanical seal (190) for sealing between the bearing housing (180). The method of claim 1, In the first piston housing 121 of the lower drive piston 120 and the second piston housing 141 of the upper idle piston 140, an outer circumferential surface of steel without an elastic body such as rubber directly has an inner circumferential surface of the lower volume chamber 131. Volumetric pump with an idle piston, characterized in that in close contact with the inner peripheral surface of the upper volume chamber (133), respectively. Four volume chambers 211, 213, 215, and 217 are formed in the casing 210, and the first piston 221 and the second volume chamber 213 disposed in the first volume chamber 211 are formed. The two pistons 223 are connected by the connecting member 231, and the first piston 221 and the second piston 223 are operated by the first drive shaft 241 mounted to the first piston 221. The third piston 225 disposed in the third volume chamber 215 and the fourth piston 227 disposed in the fourth volume chamber 217 are connected by the connecting member 235 to connect the third piston 225. The third piston 225 and the fourth piston 227 are actuated by the second drive shaft 245 mounted on the), and the first piston 221, the second piston 223, and the third piston 225 are operated. And the fourth piston 227 is disposed so as to have a phase difference of 90 ° from each other in each of the volume chambers 211, 213, 215, and 217, and the clutch bearing 251 on the idling shaft 243 of the second piston 223. ), The lower portion of the fourth piston 227 A clutch bearing 253 is mounted on the lifting shaft 247, and the first drive shaft 241 and the second drive shaft 245 are connected by the gears 261 to power the first drive shaft 241. A volumetric pump with an idle piston characterized in that it is delivered to the second drive shaft (245).

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