KR101715677B1

KR101715677B1 - pressure gear pump

Info

Publication number: KR101715677B1
Application number: KR1020150131760A
Authority: KR
Inventors: 재 연 정; 인 성 조; 문 기 권; 영 빈 김; 우 진 류
Original assignee: (유)한독엘리베이터; 전북대학교산학협력단
Priority date: 2015-09-17
Filing date: 2015-09-17
Publication date: 2017-03-15

Abstract

The present invention relates to a hydraulic gear pump for a fluid to be discharged and introduced by rotation of a plurality of gear teeth and, more specifically, relates to a hydraulic gear pump to extend durability in use by supporting a load applied to a rotating shaft by transferring a portion of a fluid discharged in a direction corresponding to a pressurization force applied to the rotating shaft due to pressure of the discharged fluid, so as to prevent eccentric rotation, which is caused when the concentricity of the rotating shaft supporting the gear teeth by using hydraulic pressure through which the fluid is discharged is not preserved.

Description

Hydraulic gear pump {pressure gear pump}

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a hydraulic gear pump capable of allowing a fluid to flow out and flowed by rotation of a plurality of gear teeth, and more particularly to a hydraulic gear pump that prevents eccentric rotation of a rotary shaft, And a part of the fluid discharged in a direction corresponding to the pressing force applied to the rotating shaft due to the pressure of the discharged fluid is transferred to support the load applied to the rotating shaft, thereby extending the service life.

Generally, a gear pump is constituted by a structure in which a driving gear and a driven gear, which are mutually engaged with each other, are arranged inside a casing. At this time, the driving gear drives the driven gear to engage with each other and rotate, resulting in a pumping action.

When the teeth of the gear are separated from each other at the suction port side, the suction chamber is formed between the gear tooth and the teeth. Since the volume of the suction chamber is increased by the volume occupied by one of them, The fluid is pushed in the direction of the discharge port by being interposed between the groove and the outer periphery of the casing. In more detail, a gear pump includes two drive gears meshed with each other and a pump gear composed of a follower gear, into a casing that is in contact with the pump gear, and rotates the gear so that the space formed between the groove of the teeth and the peripheral wall And a structure of a pumping part for flowing the fluid through the movement.

The following shows the structure of a general gear pump.

FIG. 1 is a sectional side view showing a gear pump according to a conventional technique, and FIG. 2 is a front sectional view showing a gear pump according to a conventional technique.

1 and 2, a conventional gear pump 10 includes a drive gear 14 and a driven gear 16, which are meshed with each other and rotate in a casing 12 having an intake port 12a and a discharge port 12b. And a driving shaft 14a and a driven shaft 16a are formed at the center of the driving gear 14 and the driven gear 16, respectively. At this time, when the power is transmitted through the shaft 14a of the drive gear 14 by the driving means (motor, etc.) and the rotation is performed, the driven gear 16 engaged with the drive gear 14 is rotated to perform the pumping action .

However, in the conventional gear pump, since one driving gear and one driven gear are engaged with each other through meshing, there arises a problem that the load is eccentrically exerted only on one side where the teeth of the gear are meshed with each other. Therefore, in the conventional gear pump, there is a problem of eccentric load in which the load is eccentric to only one side where the teeth of the gears are meshed with each other, so that problems such as breakage or damage of the teeth occur, Which is a cause of degradation.

In addition, since the conventional gear pump has a structure in which one driving gear and one driven gear are engaged with each other through meshing, there is a problem that the suction and discharge of the fluid due to the driving of the gear are performed only in one direction, When the driven rotor is made of a metal material, when a liquid or a foodstuff which requires high purity due to abrasion or damage of the gear is to be sent out, impurities generated from wear of the gear are mixed, which may cause a lot of problems .

1. Registration Patent Publication No. 10-0202163 'Rotary Pump' (Registered on Mar. 17, 1999) 2. Publication No. 10-2015-0009973 'Gear pump or hydraulic gear motor with helical saw provided with hydraulic system for axial thrust balancing' (Published Jan. 2015) 3. Published Japanese Patent Application No. 10-2013-0090449 'Gear Pump' (Release date 2013.08.14)

SUMMARY OF THE INVENTION The present invention has been conceived to solve the above-mentioned problems, and it is an object of the present invention to prevent the eccentric rotation of the rotary shaft by supporting a part of the fluid discharged in the direction opposite to the eccentric load acting on the rotary shaft of the gear, And to provide a hydraulic gear pump that can be used as a hydraulic pump.

Further, according to the present invention, a plurality of gear rotating shafts can be rotated in parallel with each other due to a uniform load applied to them without deviating from the concentricity, thereby preventing breakage or breakage of the gear teeth, .

The hydraulic gear pump of the present invention includes a case 100 in which an accommodation space S is formed; A drive rotation shaft 200, one side of which is exposed to the outside of the case 100 and the other side of which is located inside the case 100, and which receives power from an exposed side and rotates; A first gear teeth 210 installed on a side surface of the driving rotation shaft 200 and positioned in the accommodation space S; A driven rotary shaft 300 parallel to the driving rotary shaft 200 and rotatably installed in the case 100; A second gear tooth 310 meshing with the first gear tooth 210 and installed on a side surface of the driven rotation shaft 300 to rotate the driven rotation shaft 300 as the drive rotation shaft 200 rotates; An inlet pipe 400 formed at one side of the case 100 and sucking fluid as the first gear teeth 210 and the second gear teeth 310 are engaged and rotating; When the fluid introduced into the inflow pipe 400 is transferred according to the rotation of the first gear teeth 210 and the second gear teeth 310, the inflow pipe 400 is opened to discharge the fluid to the outside of the case 100, And a discharge pipe (500) for guiding the fluid in symmetry with respect to the axis of rotation of the drive shaft (200), wherein the concentricity of the drive rotation shaft (200) and the driven rotation shaft (300) is displaced by the pressure of the fluid transferred to the discharge pipe A part of the fluid located in the discharge pipe 500 in a direction opposite to the pressure direction P1 of the fluid is supplied to the driving rotation axis 200 and the driven rotation axis 300 to prevent rotation of the driving rotation axis 200, And supports the driven rotary shaft (300).

The case 100 may further include a driving rotation shaft insertion groove 110 into which the other end of the driving rotation shaft 200 is inserted and a plurality of driven teeth One side of the discharge pipe 500 communicates with the rotation shaft insertion groove 120 and a part of the fluid discharged to the discharge pipe 500 and the other side communicates with the drive rotation axis insertion groove 110 and the driven rotation axis insertion / A fluid passage 130 is formed which is divided to communicate with the grooves 120,

The driving rotation axis insertion groove 110 and the driven rotation axis insertion groove 120 are formed with a guide ring 600 into which the driving rotation axis 200 and the driven rotation axis 300 are inserted, The inner surface of the fluid transfer path (200) and the driven rotation shaft (300) are formed with an inner surface of the fluid transfer path (200) so as to increase the area of the fluid contacting the sides of the drive rotation shaft And a fluid receiving groove (610) communicating with the other side of the fluid receiving groove (130).

In order to prevent eccentric rotation of a gear due to the pressure of a discharged fluid, a part of a fluid discharged in a direction opposite to the pressure of the fluid is transferred to support the rotation shaft, thereby preventing the rotation shaft from eccentrically rotating The durability of the gear teeth can be improved.

In addition, according to the present invention, a uniform load is applied to a plurality of gear rotating shafts so that a plurality of gear rotating shafts are parallel to each other, thereby preventing breakage or breakage of the gear teeth and extending the life expectancy of the gear pump. And the efficiency of discharge and input / output of the pump can be improved.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side cross-sectional view showing a gear pump according to a conventional technique. FIG.
2 is a front sectional view showing a gear pump according to a conventional technique.
3 is a perspective view showing the overall structure of the hydraulic gear pump of the present invention.
4 is an exploded perspective view showing the main internal structure of the hydraulic gear pump of the present invention.
5 is a cross-sectional view showing the operating state of the hydraulic gear pump of the present invention and the pressure direction of the discharged fluid.
6 is a cross-sectional view showing the configuration of a fluid path and a guide ring for supplying fluid to a drive rotation shaft and a driven rotation shaft of the present invention;
7 is a schematic view showing a pressure distribution of a fluid supplied to the guide ring of the present invention.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 3 is an exploded perspective view showing the internal structure of the hydraulic gear pump of the present invention, FIG. 5 is a perspective view showing the operation state of the hydraulic gear pump of the present invention, FIG. 6 is a cross-sectional view showing the configuration of a fluid path and a guide ring for supplying fluid to the drive rotation shaft and the driven rotation shaft of the present invention, and FIG. 7 is a cross-sectional view showing the pressure distribution Fig.

Referring to FIG. 3, the hydraulic gear pump of the present invention has a case 100. A receiving space S is formed inside the case 100. [ The case 100 is provided with a driving rotation axis 200. One side of the driving rotation axis 200 is exposed to the outside of the case 100 while the other side is located inside the case 100, Is rotatable.

The driving rotation shaft 200 is formed into a cylindrical rod shape and is fastened to the exposed one side by separate power means. Therefore, the driving rotation shaft 200 rotates in one direction or the other direction due to the operation of the power means (not shown).

Referring to FIGS. 4 and 5, a first gear teeth 210 integral with the driving rotation shaft 200 are provided along a side surface of the driving rotation shaft 200. The first gear teeth 210 are formed of a plurality of gear teeth spaced apart from each other by a predetermined distance along a side surface of the driving rotary shaft 200. The first gear teeth 210 are formed in the receiving space S of the case 100, Lt; / RTI >

Referring to FIGS. 4 and 5, a driven rotation shaft 300 parallel to the driving rotation axis 200 is provided. The driven rotary shaft 300 is positioned on the receiving space S of the case 100 so that both side ends thereof are rotatably mounted on the inner side surface of the case 100. The driven rotary shaft 300 is also preferably formed in a cylindrical bar shape having a predetermined diameter.

A second gear teeth 310 is provided on the side surface of the driven shaft 300 so as to be positioned on the receiving space S of the case 100. The second gear teeth 310 are formed of a plurality of gear teeth so as to mesh with the first gear teeth 210 and have the same number of teeth as the first gear teeth 210. Accordingly, when the driving rotary shaft 200 receives power from the external power means and rotates, the first gear teeth 210 engage with and rotate with the second gear teeth 310, so that the driven rotary shaft 300 can rotate. Since the number of gears of the first gear teeth 210 and the second gear teeth 310 is the same, the driving rotational shaft 200 and the driven rotational shaft 300 rotate at the same rotational speed.

3 to 5, an inlet pipe 400 is formed at one side of the case 100 to communicate with the accommodation space S by sucking fluid. The inlet pipe 400 is connected to a moving pipe (not shown) through which the fluid moves. As the first gear teeth 210 and the second gear teeth 310 are engaged and rotated, the fluid can be sucked from the moving pipe.

Further, a discharge pipe 500, which is symmetrical with the inflow pipe 400, is provided on the other side of the case 100. The discharge pipe 500 communicates with the accommodation space S and when the fluid introduced into the inflow pipe 400 is transferred according to the rotation of the first gear teeth 210 and the second gear teeth 310, 100). The discharge pipe 500 may also be connected to a separate moving pipe (not shown).

Referring to FIG. 5, the driving rotation axis 200 and the driven rotation axis 300 are pushed in the fluid pressure direction P1 by the pressure of the fluid delivered to the discharge pipe 500. As a result, the concentricity formed between the driving rotary shaft 200 and the driven rotary shaft 300 is displaced, so that parallelism can not be maintained.

At this time, if a part of the fluid located in the discharge pipe 500 in the direction opposite to the pressure direction P1 of the fluid is supplied to the other end of the drive rotation shaft 200 and both ends of the driven rotation shaft 300, The driving rotary shaft 200 and the driven rotary shaft 300 can be kept parallel to each other since the fluid having the same pressure as the pressure of the fluid supporting the driving rotary shaft 200 and the driven rotary shaft 300 is supported.

4 and 6, a driving rotation shaft insertion groove 110 into which the other end of the driving rotation shaft 200 is inserted is formed at one side of the accommodation space S in the case 100. [ On both sides of the accommodation space S, a plurality of driven rotation axis insertion grooves 120 into which both ends of the driven rotation axis 300 are inserted are formed.

At this time, a fluid path 130 through which a part of the fluid discharged to the discharge pipe 500 flows is formed inside the case 100. One side of the fluid transfer passage 130 communicates with the discharge pipe 500 to receive a part of the fluid and the other side of the fluid transfer passage 130 is connected to the drive rotation shaft insertion groove 110 and the driven rotation shaft insertion groove 120, And is communicated with the inside of the driving rotary shaft insertion groove 110 and the inside of the driven rotary shaft insertion groove 120. At this time, the direction of the other side of the fluid path 130 is oriented toward a direction opposite to the pressure direction P1 of the fluid.

Referring to FIG. 6, a guide ring 600 is formed in the drive rotation shaft insertion groove 110 and the driven rotation shaft insertion groove 120, and one end of the drive rotation shaft 200 and both ends of the driven rotation shaft 300 are inserted.

At this time, a fluid receiving groove 610 communicating with the fluid path 130 is formed on the inner surface of the guide ring 600. The fluid receiving grooves 610 are formed in a predetermined depth along the inner surface of the guide ring 600 so as to have a constant area in the outer direction of the guide ring 600. The fluid receiving groove 610 receives fluid received from the fluid moving path 130.

That is, since the fluid receiving groove 610 increases the area of the fluid contacting the side surfaces of the driving rotation axis 200 and the driven rotation axis 300, the driving rotation axis 200 and the driven rotation axis 200, So that it can be stably supported in correspondence with the load of the motor 300.

Referring to FIG. 7, the operation of the fluid receiving groove 610 will be described in detail. FIG. 7 (a) shows a state in which only the fluid path 130 is formed in the guide ring 600. At this time, the pressure distribution of the fluid is concentrated and distributed at the end of the fluid transfer path 130 in which the fluid moves, thereby effectively supporting the load of the driving rotation axis 200 and the driven rotation axis 300 applied in the pressure direction P1 of the fluid can not do it.

On the other hand, when the fluid receiving groove 610 is formed in the guide ring 600 of FIG. 7 (b), the pressure distribution of the fluid is uniformly distributed in the same area as the area of the fluid receiving groove 610, It is possible to provide the same supporting force as the load applied to the driving rotary shaft 200 and the driven rotary shaft 300. [ Therefore, the drive rotation shaft 200 and the driven rotation shaft 300 can be kept parallel to each other and prevented from eccentric rotation.

The hydraulic gear pump of the present invention constructed as described above prevents the eccentric rotation of the driving rotary shaft 200 and the driven rotary shaft 300 and improves the durability of the first gear teeth 210 and the second gear teeth 310 And it is possible to prevent breakage or breakage of the gear teeth and to extend the life expectancy of the gear pump and to improve the discharge and input / output efficiency of the pump.

100: Case 110: Driving rotary shaft insertion groove
120: a driven rotary shaft insertion groove 130:
200: drive rotation shaft 210: first gear
300: driven rotor shaft 310: second gear tooth
400: inlet pipe 500; Discharge pipe
600: guide ring 610: fluid receiving groove

Claims

A case 100 having a receiving space S formed therein;
A drive rotation shaft 200, one side of which is exposed to the outside of the case 100 and the other side of which is located inside the case 100, and which receives power from an exposed side and rotates;
A first gear teeth 210 installed on a side surface of the driving rotation shaft 200 and positioned in the accommodation space S;
A driven rotary shaft 300 parallel to the driving rotary shaft 200 and rotatably installed in the case 100;
A second gear tooth 310 meshing with the first gear tooth 210 and installed on a side surface of the driven rotation shaft 300 to rotate the driven rotation shaft 300 as the drive rotation shaft 200 rotates;
An inlet pipe 400 formed at one side of the case 100 and sucking fluid as the first gear teeth 210 and the second gear teeth 310 are engaged and rotating;
When the fluid introduced into the inflow pipe 400 is transferred according to the rotation of the first gear teeth 210 and the second gear teeth 310, the inflow pipe 400 is opened to discharge the fluid to the outside of the case 100, And a discharge pipe (500) symmetrical with the discharge pipe and guiding the fluid,
The fluid is discharged in a direction opposite to the pressure direction P1 of the fluid so as to prevent eccentric rotation of the driving rotary shaft 200 and the driven rotary shaft 300 due to the pressure of the fluid transferred to the discharge pipe 500, Wherein a part of the fluid located in the pipe 500 is supplied to the drive rotation shaft 200 and the driven rotation shaft 300 to support the drive rotation shaft 200 and the driven rotation shaft 300.

The method according to claim 1,
In the case 100, a drive rotation shaft insertion groove 110 into which the other end of the drive rotation shaft 200 is inserted and a plurality of driven rotation shaft insertion grooves 120 (not shown) into which both ends of the driven rotation shaft 300 are inserted, ) And
One side of the discharge pipe 500 communicates with the discharge pipe 500 and the other side of the discharge pipe 500 communicates with the drive rotation shaft insertion groove 110 and the driven rotation shaft insertion groove 120, And the fluid passage (130) is divided so that the fluid passage (130) is divided.

3. The method of claim 2,
The driving rotation axis insertion groove 110 and the driven rotation axis insertion groove 120 are formed with a guide ring 600 into which the driving rotation axis 200 and the driven rotation axis 300 are inserted,
The inner surface of the guide ring 600 is provided with an elastic member for increasing the area of the fluid contacting the side surfaces of the driving rotation axis 200 and the driven rotation axis 300 to stably support the driving rotation axis 200 and the driven rotation axis 300. [ And a fluid receiving groove (610) communicating with the other side of the fluid transfer path (130) to be inserted to a predetermined depth is formed.