KR101260886B1 - Swash plate type inflator and lubricating method thereof - Google Patents

Abstract

The present invention relates to a swash plate expander, the swash plate expander according to the present invention, a hollow piston body having a recovery hole passing through the inner diameter and the outer diameter, a piston head coupled to one end of the piston body, the piston head A piston cylinder group including a plurality of pistons including a piston lower formed on an opposite side of the piston, and a plurality of cylinders, each of which is inserted into the piston and in which a first inlet hole is drilled; And an annular inclined plate fixedly mounted to one surface of the bearing shoe to which the piston lower is rotatably coupled, wherein the piston lower and the bearing shoe are lubricated oil passage and lubrication, respectively, so as to communicate with the piston body. It is formed, the inclined plate, characterized in that the lubricating oil discharge portion is formed in communication with the lubrication portion of the bearing shoe, by using the swash plate expander according to the present invention, the durability is improved, lubricating oil to the place where lubrication is not required Can be minimized.

Description

Swash plate expander and its lubrication method {SWASH PLATE TYPE INFLATOR AND LUBRICATING METHOD THEREOF}

The present invention relates to a swash plate expander, and more particularly, to a lubrication method of a swash plate expander in which lubricating oil is smoothly recovered by minimizing supply of lubricating oil to a non-lubricated portion.

In general, a swash plate expander is a device that obtains power by driving a piston through an increase in hermetic volume and rotating the inclined plate using the kinetic energy of the piston. A variety of working fluids for operating the swash plate expander can be used. When the swash plate expander is driven with a working fluid that does not contain lubricating components, the swash plate expander is overheated to close the micro clearance between the cylinder and the piston. The filling of the piston ring is broken, and the airtightness of the cylinder is lowered, which causes a problem that the mechanical efficiency of the swash plate expander is lowered.

Conventionally, in order to solve this problem, as shown in FIG. 1, the lubricant O was supplied between the piston 10 and the cylinder 50. However, in the conventional swash plate expander, after lubricating between the piston 10 and the cylinder 50, the cylinder through the hole 50h in which the lubricant O is perforated in the cylinder and the hole 55h formed in the rotor or the like. Since it was discharged to the outer circumferential surface side of (50), there was a problem that the lubricating oil was not recovered smoothly while the lubricating oil O remained in a part such as a case where lubrication was not required. In addition, since the lubrication is performed only at the coupling portion of the cylinder 50 and the piston 10, at the point 16 where the piston 10 and the inclined plate 30 are coupled, abrasion still occurs frequently, so that durability of the swash plate expander is increased. There was a problem that this was lowered.

The first problem to be solved by the present invention is to provide a swash plate expander capable of lubricating the coupling portion of the piston and the cylinder and the coupling portion of the piston and the inclined plate.

A second problem to be solved by the present invention is to provide a lubrication method of a swash plate expander that can reduce unnecessary lubricant consumption.

In order to solve the first problem, the present invention provides a hollow piston body having a recovery hole penetrating an inner diameter and an outer diameter, a piston head coupled to one end of the piston body, and a piston lower formed at an opposite side of the piston head. A piston cylinder group including a plurality of pistons to be included, and a plurality of cylinders, each of which is inserted into the piston and having a first inlet hole drilled therein; And

Bearing piston to which the piston lower is rotatably coupled, including an annular inclined plate fixedly mounted on one surface,

In order to communicate with the piston body, the piston lower and the bearing shoe are each formed with a lubricating oil path and a lubricating part,

The swash plate is provided with a swash plate expander, characterized in that the lubricating oil discharge portion is formed in communication with the lubrication portion of the bearing shoe.

According to one embodiment of the invention, the lubricating oil discharge portion, may be formed in a slit shape on one surface of the inclined plate.

In addition, the lubricating oil discharge part may be formed through the inclined plate.

In addition, the swash plate expander, a lubricant storage tank;

A rotor in which the piston cylinder group is fixedly coupled, the second inlet hole being in communication with each of the first inlet holes;

The rotation axis direction is fixedly coupled to the rotor in accordance with the axial direction of the piston cylinder group, and includes a main inlet passage formed in the rotation axis direction, and a floating inlet passage formed in communication with the second inlet hole and the main inlet passage. A shaft; And

It is preferable to further include a lubrication pump for supplying lubricating oil in the lubricating oil reservoir to the main inlet of the shaft.

At this time, the shaft,

A bypass line formed in communication with an outer circumferential surface of the shaft, and

It is preferable to include a relief valve for opening and closing the bypass line.

The present invention provides a lubricating step of lubricating a group of piston cylinders by supplying lubricating oil to a position where the cylinder inner circumferential surface and the piston outer circumferential surface of the swash plate expander face each other to solve the second problem;

A first lubricating oil recovery step in which the lubricating oil having passed through the cylinder lubricating step moves to a space formed in the piston;

A lower bearing lubricating step through which the lubricating oil flows into the bearing shoe fixedly coupled to the inclined plate through the lower of the piston; And

It provides a lubrication method of a swash plate expander comprising the; lubricating oil recovery step of lubricating oil flowing into the lubricating oil reservoir.

According to an embodiment of the present invention, the bypass step of adjusting the amount of lubricating oil flowing into the cylinder before the cylinder lubrication step; preferably further comprises a.

According to the present invention, the lubricating oil is smoothly recovered by minimizing the supply of lubricating oil to the non-lubricated portion, and the durability of the swash plate expander is increased because lubrication is performed to prevent wear of the inclined plate and the piston coupling position. In addition, the amount of lubricating oil introduced into the cylinder can be adjusted to prevent the lubricating oil from being introduced into the expansion space of the piston cylinder group.

1 is a cross-sectional view of a typical swash plate expander.
2 is a partial perspective view of a swash plate expander according to an embodiment of the present invention.
3 is a cross-sectional view of a swash plate expander according to an embodiment of the present invention.
4 is an enlarged view of a swash plate expander according to an embodiment of the present invention.
5 is a flowchart of a swash plate expander lubrication method according to an embodiment of the present invention.

Hereinafter, the present invention will be described in detail.

The swash plate expander according to the present invention includes a hollow piston body 114 having a recovery hole 114h passing through an inner diameter and an outer diameter, a piston head 112 coupled to one end of the piston body 114, A plurality of pistons 110 including a piston lower 116 formed on the opposite side of the piston head 112, and the piston 110 is inserted therein, a plurality of first inlet hole 150h is a plurality of A piston cylinder group 100 including a cylinder 150; And

The bearing shoe 210 to which the piston lower 116 is rotatably coupled includes an annular inclined plate 230 fixedly mounted on one surface thereof.

In order to communicate with the piston body 114, the piston lower 116 and the bearing shoe 210 are each formed with a lubricating oil movement path 116h and a lubrication portion 210h,

The inclined plate 230 is characterized in that the lubricating oil discharge portion 230h communicated with the lubricating portion 210h formed inside the bearing shoe 210 is formed.

The swash plate expander is a device capable of converting thermal energy and pressure energy of a high temperature and high pressure fluid into mechanical energy and outputting the same. The piston reciprocating in the cylinder 150 by coupling the inclined plate 230 with the piston 110. The inclined plate 230 and the rotor 350 are rotated by the 110, and the rotational force supplies the driving force to the mechanical device equipped with the swash plate expander through the shaft 360.

In the swash plate expander according to the present invention, the lubricating oil O introduced into the piston cylinder group 100 is not immediately discharged to the outside of the piston cylinder group 100, and the recovery hole 114h of the piston 110 is provided. By lubricating oil (O) recovered through the flow into the lubrication portion (210h) of the bearing shoe 210, so that the coupling position between the bearing shoe 210 and the piston lower 116 can also be lubricated.

Hereinafter, the present invention will be described in more detail with reference to preferred embodiments. It will be apparent to those skilled in the art, however, that these examples are provided to further illustrate the present invention, and the scope of the present invention is not limited thereto.

Figure 2 is shown in order to easily grasp the passage of the lubricating oil to the swash plate expander according to an embodiment of the present invention, a partial perspective view of the swash plate expander according to an embodiment of the present invention.

As shown in FIG. 2, after the lubricating oil O provided in the lubricating oil reservoir 340 passes through the filter f, the swash plate expander according to the exemplary embodiment of the present invention has a shaft along the lubricating oil supply pipe h. 360 will flow into. In this case, the lubricating oil O is introduced into the shaft 360 by the lubrication pump 370. The lubricating oil (0) introduced into the shaft (360) flows into the piston cylinder group (100) through the floating inlet (364), moves to the inside of the piston (110), and communicates with the bearing shoe (210). The lubricant is discharged back to the lubricant reservoir 340 through the discharge portion.

3 is a cross-sectional view of a swash plate expander according to an embodiment of the present invention.

Lube oil (O) used in the swash plate expander is provided in the lubricating oil reservoir (340). Lubricating oil (O) in the lubricating oil reservoir 340 passes through the lubricating oil supply pipe (h) through the filter (f). The lubricating oil O passing through the lubricating oil supply pipe h moves to a main inflow path 362 formed in the shaft 360 by driving of the lubricating pump 370. In this case, the lubrication pump 370 may be combined with the shaft 360 to use a trochoid pump driven by the rotational force of the shaft 360. That is, when the shaft 360 rotates while the piston 110 reciprocates by a working fluid, the lubrication pump 370 coupled to the shaft 360 is simultaneously driven. Therefore, the lubricating oil O in the lubricating oil reservoir 340 may be supplied into the shaft 360.

The lubricating oil O introduced through the main inlet path 362 in the shaft 360 constitutes the piston cylinder group 100 through the floating inlet path 364 communicating with the main inlet path 362. Flows into the cylinder 150. The rotor 350 is coupled between the piston cylinder group 100 and the shaft 360. The rotor 350 is coupled with the shaft 360. In addition, since the rotor 350 fixes each cylinder 150 constituting the piston cylinder group 100, the rotation of the piston cylinder group 100 may be transmitted to the shaft 360. . That is, the shaft 360 is installed so that the shaft of the swash plate expander and the rotation axis of the shaft 360 coincide with each other. Therefore, a second inlet hole 350h of the rotor 350 is formed between the first inlet hole 150h of the cylinder 150 and the floating inlet path 364 of the shaft 360, so that the shaft 360, the rotor 350 and the cylinder 150 are in communication with each other.

The lubricating oil O passing through the first inlet hole 150h of the cylinder 150 lubricates between the outer circumferential surface of the piston 110 and the inner circumferential surface of the cylinder 150. At this time, the piston head 112 is mounted to prevent the lubricating oil (O) from flowing into the expansion space of the piston 110 and the cylinder 150. Lubricating oil O lubricating between the piston 110 and the cylinder 150 passes through the recovery hole 114h bored in the piston body 114 and flows into the hollow piston body 1140. do. Thereafter, the lubricant O moves toward the piston lower 116 and passes through the lubricant movement path 116h and then flows into the lubrication portion 210h of the bearing shoe 210. When the piston 110 is rotated along the inclined plate 230, the coupling portion between the piston lower 116 and the bearing shoe 210 is rotated, the lubricating oil introduced into the lubrication portion (210h) ( The piston lower 116 and the bearing shoe 210 are lubricated by O).

At this time, the piston lower 116 and the bearing shoe 210 may be directly coupled, as shown in Figure 3, by fastening the bearing body 117 to the piston lower 116, the bearing body ( 117) can lubricate the area where the bearing shoe contacts.

In the inclined plate 230 to which the bearing shoe 210 is fixedly coupled, lubricant oil discharge parts 230h and 230h 'communicating with the lubrication part 210h are formed. In this case, the lubricating oil discharge part 230h may be formed in a slit shape, as shown in the upper inclined plate based on the axis of the shaft. In addition, the lubricating oil discharge part 230h 'may be formed by drilling a hole through the inclined plate, as shown in the lower inclined plate based on the axis.

The slit-shaped lubricant discharge part 230h may allow the lubrication part 210h and the outer diameter 234 of the inclined plate, or the lubrication part 210h and the inner diameter 232 of the inclined plate to communicate with each other. When the lubricating oil discharge part (not shown) is formed such that the lubricating part 210h and the outer diameter 234 of the inclined plate communicate with each other, the centrifugal force acts on the lubricating oil located in the lubricating oil discharge part to smoothly discharge the lubricating oil. Since the lubricating oil discharge part has a slit shape, the lubricating oil can be minimized to the non-lubricated part. In addition, when the lubricating oil discharge part 230h is formed such that the lubricating part 210h and the inner diameter 232 of the inclined plate communicate with each other, the lubricating oil O is prevented from being radiated to a position where lubrication is unnecessary by centrifugal force. At the same time, the lubricating oil O which has passed through the lubricating oil discharge part 230h by the pressure in the cylinder falls into the lubricating oil storage tank 340 by gravity and is recovered to the lubricating oil storage tank 340. Whether the slit-shaped lubricating oil discharge portion is formed to communicate with any position of the inner or outer diameter of the inclined plate may be changed depending on the rotational speed or other driving environment performed in the swash plate expander.

In addition, when the lubricating oil discharge part 230h 'is formed through the inclined plate, since the lubricating oil discharge part 230h' communicates with the housing bearing B ₁ , the lubricating oil is recovered after lubricating the housing bearing. You can do that.

4 is an enlarged cross-sectional view of a swash plate inflator according to an embodiment of the present invention as an enlarged view of FIG.

In the swash plate expander according to the present invention, the lubricating oil (O) pressure is increased in the piston cylinder group 100, in order to prevent the lubricating oil (O) from flowing into the expansion space of the piston cylinder group 100. 4, the relief valve 369 may be mounted. In addition to the floating inlet path 364, the shaft 360 has a bypass line 366 formed to discharge the fluid passing through the main inlet path 362. The relief valve 369 opens and closes the bypass line 366. That is, when the amount of the lubricating oil O increases in the piston cylinder group 100, as shown in FIG. 4B, the relief valve 369 opens the bypass line 366, whereby the main inflow A portion of the lubricating oil O passing through the furnace 362 is moved to the bypass line 366. Lubricating oil (O) passing through the bypass line (366) is discharged from the shaft 360 is moved to the lubricant reservoir.

At this time, the relief valve 369, as shown in Figure 4, when a large amount of lubricating oil, which is an incompressible fluid is supplied into the cylinder to increase the pressure in the cylinder, the relief valve 369 is pushed. Accordingly, the bypass line 366 is driven to open while the spring on which the relief valve 369 is mounted is compressed. When the lubricant O moves along the bypass line 366 to reduce the pressure in the cylinder, the relief valve 369 causes the relief valve 369 to close the bypass line 366 again by the restoring force of the spring. do. Although the relief valve 369 is driven by a spring, the swash plate expander according to the present invention can be opened and closed by the spring, and the driving method of the relief valve 369 is not limited thereto.

5 is a lubrication method of the swash plate expander according to an embodiment of the present invention.

In the lubrication method of the swash plate expander in the swash plate expander according to the present invention, as shown in Figure 5, the cylinder lubrication for supplying lubricating oil in a position where the cylinder inner peripheral surface and the piston outer peripheral surface of the swash plate expander facing each other Step S1;

A first lubricant recovery step (S2) of lubricating oil having passed through the cylinder lubricating step (S1) to move to a space formed in the piston;

A lower bearing lubricating step through which the lubricating oil is introduced into the bearing shoe fixedly coupled to the inclined plate through the lower of the piston (S3); And

And a second lubricant recovery step (S4) through which the lubricating oil passing through the lower bearing lubricating step flows into the lubricating oil storage tank.

The cylinder lubrication step (S1) is performed after the oil supply for supplying the lubricating oil to the main inlet passage of the shaft with a lubrication pump is completed, the step of supplying the lubricating oil into the piston cylinder group through the floating inlet of the shaft to be.

In addition, the first lubricating oil recovery step (S2) is a step of moving into the piston through the recovery hole drilled in the piston.

In addition, the lower bearing lubricating step (S3) is a step in which the lubricating oil introduced into the piston passes through the lubricating oil movement path of the piston lower to lubricate between the bearing shoe and the piston lower.

In addition, the second lubricating oil recovery step (S4) is a step in which the lubricating oil is recovered to the lubricating oil storage tank, the lubricating oil passing through the lower bearing lubricating step (S3) or bypass step (S10) is recovered to the lubricating oil storage tank. to be.

Here, the bypass step (S10) is a step of adjusting the amount of lubricating oil in the piston cylinder group, it is possible to prevent the lubricating oil from flowing into the expansion space of the piston cylinder group.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

100: piston cylinder group 110: piston
112: piston head 114: piston body
114h: recovery hole 116: piston lower
116h: lubricant transfer path 150: cylinder
150h: first inlet hole 210: bearing shoe
210h: Lubrication part 230: Inclined plate
230h, 230h ': Lubricant outlet 232: Internal diameter of inclined plate
340: lubricant reservoir 350: rotor
350h: second inlet 360: shaft
362: main flow path 364: floating flow path
366: bypass line 369: relief valve
370: lubrication pump f: filter
h: Lubricant supply line O: Lubricant

Claims (7)

A plurality of pistons including a hollow piston body having a recovery hole penetrating an inner diameter and an outer diameter, a piston head coupled to one end of the piston body, a piston lower formed on an opposite side of the piston head, and the pistons respectively A piston cylinder group inserted into and including a plurality of cylinders in which a first inlet hole is drilled; And
Bearing piston to which the piston lower is rotatably coupled, including an annular inclined plate fixedly mounted on one surface,
In order to communicate with the piston body, the piston lower and the bearing shoe are each formed with a lubricating oil path and a lubricating part,
The swash plate inflator is in communication with the lubrication portion of the bearing shoe, the lubricating oil discharge portion is formed in one surface of the inclined plate in a slit shape. delete The method of claim 1,
The lubricating oil discharge part, characterized in that formed through the inclined plate swash plate expander. The method of claim 1,
Lubricant reservoir;
A rotor in which the piston cylinder group is fixedly coupled, the second inlet hole being in communication with each of the first inlet holes;
The rotation axis direction is fixedly coupled to the rotor in accordance with the axial direction of the piston cylinder group, and includes a main inlet passage formed in the rotation axis direction, and a floating inlet passage formed in communication with the second inlet hole and the main inlet passage. A shaft; And
And a lubrication pump for supplying lubricating oil in the lubricating oil reservoir to a main inlet of the shaft. 5. The method of claim 4,
The shaft includes:
A bypass line formed in communication with an outer circumferential surface of the shaft, and
And a relief valve for opening and closing the bypass line. A cylinder lubricating step of lubricating a group of piston cylinders by supplying lubricating oil to a position where the cylinder inner circumferential surface and the piston outer circumferential surface of the swash plate expander according to any one of claims 1 and 3 to 5 face each other;
A first lubricating oil recovery step in which the lubricating oil passed through the cylinder lubricating step moves to a space formed in the piston;
A lower bearing lubricating step through which the lubricating oil flows into the bearing shoe fixedly coupled to the inclined plate through the lower of the piston; And
Lubricating oil lubricating method of the swash plate expander comprising a; lubricating oil flowing into the lubricating oil reservoir. The method according to claim 6,
And a bypass step of adjusting the amount of lubricating oil introduced into the cylinder before the cylinder lubricating step.

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