KR100695934B1 - Fluid Discharge Structure of Gerotor Pump - Google Patents

Abstract

The present invention relates to a fluid discharge structure of a gerotor pump. The present invention relates to a fluid discharge structure of a gerotor pump. It is to reduce the noise and pressure loss caused by the discharge flow path.

According to the present invention for realizing this, a rotor housing 10 having an upper opening and a suction passage 11 of a fluid is formed at the bottom thereof is mounted at the bottom of the pump, and the inner rotor 21 is disposed in the rotor housing 10. ) And a rotor (20) in which the external rotor (22) is eccentrically engaged are seated, and an armature (31) for transmitting the rotational force to the rotor (20) is mounted in the pump main body (30). In the old rotor pump, the flexible housing 15 of flexible material is installed on the rotor housing 10 so that the selective discharge passage 16 can be formed by the internal pressure of the rotor 20. do.

Description

Fluid discharge structure of Gerotor pump {A FLEXIBLE PLATE STRUCTURE FOR GEROTOR PUMP}

Figure 1 is a plan view showing a typical gyro coupling state.

2 is a cross-sectional structural view of a conventional gerotor pump.

Figure 3 is a cross-sectional view showing the configuration of the gerotor pump according to the present invention.

Figure 4 is an exploded perspective view of the rotor rotor parts of the present invention.

Figure 5 is a cross-sectional view of the operation state of the present invention rotor pump.

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

<Explanation of symbols for the main parts of the drawings>

10 rotor housing 11: suction flow path

12: ceramic plate 13: steering

14 bushing 15 flexible plate

15a: fiber reinforced plastic 15b: Teflon coating layer

16: discharge flow path 20: Gerotor

21: internal rotor 22: external rotor

30: pump body 31: armature

32: rotating shaft 33: coupling

34: magnet

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gerotor pump for use in a vehicle fuel pump, and more particularly, to a fluid discharge structure of a gerotor pump for supplying fuel in a fuel tank at a constant pressure required by an engine.

In general, the Gerotor pump is composed of an inner rotor and an outer rotor, so the structure is simple and the shape is complicated as the precision of processing increases due to the development of manufacturing technology of sintered products. It is easy to process, easy to assemble and there is little relative movement between two teeth, so it has little change in efficiency and excellent suction performance even after long-term use.

That is, as shown in FIG. 1, the inner rotor 101 of the conventional rotor rotor pump has N lobes, and has (N + 1) / with the outer rotor 102 and N + 1 lobes. Rotate with a turn ratio of N And the two rotors (101, 102) has a certain eccentricity around the eccentric hole (103) due to the eccentric volume portion (S) that can transport the fluid fuel between the inner rotor 101 and the outer rotor (102) This is made. This volume portion S repeats increasing and decreasing during rotation and the rate of volume change is determined by the profile of the rotating rotor. The portion where the volume increases during the rotational movement of the rotor sucks the surrounding fluid by the pressure drop, and the portion where the volume decreases discharges the fluid due to the increase in pressure.

In order to operate on this principle, the rotor rotor must rotate with the top and bottom closed, and there must be a flow path for suction and discharge, respectively. The role of the housing is to play the housing. It holds the eccentric to rotate with a certain eccentricity and makes the flow path of working fluid.

Therefore, according to the structure of the housing, the housing is installed only on the bottom surface of the rotor, and both the discharge port and the suction port are located on the bottom surface, and a separate sealing plate is installed on the top of the rotor, for sealing, and the bottom of the rotor In the state in which both the surface and the upper surface are sealed with the housing, the bottom surface may be divided into a shape of installing an inlet and an upper surface of the outlet.

Figure 2 shows a cross-sectional structure of a conventional GROTOR pump by the former housing structure, the GROTOR 100 paired with the inner rotor 101 and the outer rotor 102 is provided in the housing 110. The rotation shaft 121 of the armature 120 is inserted into and coupled to the eccentric hole 103 formed at the center, and the suction part 111 and the discharge part 112 are located at symmetrical positions on the bottom surface of the housing 110. Is formed at the same time, it can be seen that the sealing plate 130 is fixed to the rotor (101,102) top.

However, when the discharge flow path is located on the bottom surface of the gerotor, the discharge flow path is filled with the working hydraulic pressure when the pump is operated, and the part projected on the discharge flow path of the bottom of the gerotor receives the force toward the upper side. There arises a problem that the unbalance of the force in the vertical direction occurs in the suction and discharge portion of the rotor.

That is, the uneven wear phenomenon of the bottom surface appears, wear occurs on the wall surface of the housing by being rotated in a tilted state of the rotor, there is a problem that is a direct cause of noise and vibration depending on the processing state of the rotor.

On the other hand, when the suction path is provided in the bottom housing and the discharge path is provided in the upper housing of the gerotor, and both the upper and lower surfaces are sealed by the housing, the unbalance of the vertical force of the rotor is relatively small and stable. It has the advantage of rotating.

However, in this case, when a constant interval is not maintained between the upper housing and the upper surface of the gerotor, the discharged fluid flows into the suction unit along the separation interval, and thus has a disadvantage in that the performance is drastically decreased.

In particular, when the operating pressure is high or wear occurs on the bottom surface due to the inflow of foreign matters, there was a problem that a fatal problem occurs.

The present invention has been proposed to solve the above problems in the prior art, and provides a suction / discharge structure capable of retaining the advantages of both conventional housing types, thereby reducing the vertical force acting on the gerotor to balance it. The objective is to ensure a stable rotation and at the same time maintain a constant gap on the upper surface of the rotor.

The object is that the suction flow path of the fluid is formed on the bottom surface and the housing is opened at the bottom of the pump is mounted, the inside of the housing is provided with a gyroscope is the inner rotor and the outer rotor is engaged with the eccentric rotation. In the gyroscope pump, the armature for transmitting the rotational force to the rotor is mounted in the pump body, the flexible plate is installed on the top of the rotor to allow the selective opening and closing of the discharge flow path by the internal pressure of the housing It is possible to achieve through the fluid discharge structure of the rotor rotor characterized in that.

Hereinafter, specific embodiments of the present invention will be described in detail with reference to FIGS. 3 to 5.

First, referring to the installation structure of the rotor rotor pump according to the embodiment through 3 and 4, the rotor housing 10 is mounted on the bottom of the rotor rotor body 30, the bottom surface of the rotor housing 10 The suction flow path 11 of the fluid is formed in the rotor housing 10, and the rotor 20, in which the inner rotor 21 and the outer rotor 22 are joined to each other in an eccentric form, is seated in a conventional structure. In forming the above, the flexible plate 15 of the present invention is configured on the upper portion of the gerotor 20.

In particular, the flexible plate 15 forms a thin plate shape as shown in FIG. 4 to cover the gerotor 20. When the pressure of the fluid that is increased in the gerotor 20 acts as shown in FIG. It was configured to form the discharge passage 16 while the deformation occurred in the form.

The flexible plate 15 is preferably made of fiber reinforced plastic (15a; glass fiber plastic) superior in flexibility and durability as compared to the general plastic synthetic resin material, as shown in the cross-sectional view of Figure 6, both sides lubricity and fuel By forming a Teflon coating layer (15b) using PTFE (polytetrafluoroethylene) excellent in chemical resistance with and to prevent chemical contamination.

In addition, a magnet 34 is mounted on the inner wall surface of the pump main body 30 to apply a rotational force to the armature 31, and is coupled to the shaft hole of the inner rotor 21 on the rotation shaft 32 of the armature 31. It can be seen that the coupling 33 has been inserted to achieve this.

On the other hand, the ceramic plate 12 is fixedly coupled to the bottom surface of the rotor housing 10, the steering 13 is fixedly coupled to the inner circumferential wall, the bushing 14 to support the pivot shaft 32 in the center This was made up.

That is, in the present invention, only the suction passage 11 is formed on the bottom surface of the rotor housing 10, and the flexible plate 15 blocking the top of the rotor rotor 20 serves as the sealing passage of the upper surface and serves as the discharge passage 16. It was configured to perform.

The effect of the operation of the present invention rotor rotor pump constituting such a configuration will be described.

First, when power is supplied to the pump, one-way rotational driving of the armature 31 is performed, thereby allowing the inner rotor 21 connected to the armature 31 by the coupling 33 to rotate together with the outer rotor 22. do.

At this time, the flexible plate 15 is also rotated together in a state in which the top of the rotor rotor 20 is sealed.

Then, in the process in which the rotational drive of the rotor 20 is made, the volume portion S formed by the eccentric coupling between the inner rotor 21 and the outer rotor 22 repeats the increase and decrease while rotating. In this rotational movement, the portion where the volume increases sucks the surrounding fluid with a pressure drop, and the portion where the volume decreases discharges the fluid due to the increase in pressure.

At this time, in the part where the fluid is sucked, since the flexible plate 15 presses the gerotor 20 as shown by the dotted arrow in FIG. In the portion where the discharge is made, the flexible plate 15 of the flexible material is opened upward due to the high pressure therein to form the discharge passage 16.

Particularly, since the flexible plate 15 variably forms the discharge flow path 16 at the portion where the pressure is increased in the gerotor 20, the portion where the deformation appears is fluidly displayed.

Therefore, since the stable rotation operation of the rotor 20 may be achieved through such an operation, wear and vibration of the rotor housing 10 may be prevented.

That is, in the structure of the present invention, since there is no discharge flow path on the bottom surface of the rotor housing 10, the force applied to the rotor 20 by the pressure in the flow path is eliminated, so that the unbalance of the vertical force is reduced. Inappropriate wear of the bottom of the rotor housing 10, deterioration of performance and consequent vibrations are advantageous.

In addition, since the armature 31 and the operating hydraulic pressure is always pressing the flexible plate 15, the separation space does not occur between the rotor and the flexible plate 15 is to solve the problem in the prior art.

In addition, in the present invention, since the area of the discharge passage 16 is opened by an optimal area according to the discharge pressure, unlike the conventional method, the pressure at the moment of discharging the fluid can be kept constant at all times, which is advantageous in terms of vibration.

In addition, conventionally, since the discharged fluid proceeds through a fixed discharge path of the housing, turbulence increases due to a collision with the flow path wall and a sudden change in speed, resulting in problems such as vibration, noise, wear, and loss of performance. However, in the present invention, since the discharged fluid flows along the curved curved surface of the flexible flexible plate 15, it can be seen that noise and noise generated by the discharge flow path can be reduced.

In addition, although specific embodiments of the present invention have been described and illustrated above, it is obvious that the flexible plate mounting structure of the present invention may be variously modified and implemented by those skilled in the art.

However, such modified embodiments should not be individually understood from the technical spirit or the prospect of the present invention, and such modified embodiments shall fall within the appended claims of the present invention.

According to the present invention as described above, the discharge passage pressure is always constant since the suction passage is formed only on the bottom surface of the rotor housing, and the discharge passage area is variable according to the pressure in the discharge portion without being separately formed. It shows an effect that can be maintained.

In particular, since the bottom surface has no discharge flow path, the imbalance of the vertical force acting on the rotor is reduced, thereby reducing the wear and deterioration of the housing surface.

In addition, since the discharged fluid flows along the flexible plate of the present invention, it exhibits an advantage of reducing noise and loss caused by the discharge oil.

Claims (3)

A rotor housing 10 having an upper opening is formed at the bottom of the pump while the suction passage 11 of the fluid is formed on the bottom surface, and the inner rotor 21 and the outer rotor 22 are disposed in the rotor housing 10. In a gerotor pump provided with a seating rotor (20) engaged in an eccentric rotation, and equipped with an armature (31) for transmitting a rotational force to the rotor (20) in the pump main body (30), The fluid discharge of the rotor rotor 10, characterized in that the flexible plate 15 of the flexible material is installed so that the selective discharge passage 16 is formed by the internal pressure of the rotor rotor 10. rescue. The method according to claim 1, The flexible plate 15 is the fluid discharge structure of the rotor rotor pump, characterized in that made of fiber-reinforced plastic (15a) material. The method according to claim 1 or 2, The flexible plate 15 is a fluid discharge structure of the rotor rotor pump, characterized in that the Teflon coating layer (15b) is formed on the outer surface of the fiber-reinforced plastic (15a).

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