KR20140104296A - Scroll expander - Google Patents

Abstract

The present invention relates to a scroll expander, and provides a scroll expander including: a suction chamber (10); a housing (20); a fixed scroll (30) fixed to an interior of the housing (20), having a suction opening (34) communicated with the suction chamber (10), and having a fixed wrap (32) spirally protruding from the center thereof to form a passage (36); and a pivoting scroll (40) from which a spiral pivoting wrap (42) engaged with the fixed wrap (32) protrudes and defining at least one expansion pocket (44), wherein a hole (38) is formed in the fixed scroll (30) to be inclined from the suction chamber (10) toward the passage (36). Accordingly, power can be efficiently generated by compensating for an initial rotation of the pivoting scroll (40) without using an additional power source and efficiently inducing expansion of a fluid to provide an improved rotating force. In addition, a refrigerant can be easily introduced through the suction opening (34).

Description

[0001] SCROLL EXPANDER [0002]

The present invention relates to a scroll inflator, and more particularly to a scroll inflator for efficiently rotating an initial rotation of an orbiting scroll.

The flow of fluid with heat is generated by the cooling of a compressor or an engine. Particularly, waste heat of the engine includes high-temperature exhaust waste heat and low-temperature cooling water waste heat. It is known that recovering such waste heat has many problems in terms of technology and is not very feasible in terms of economy. Therefore, waste heat is mostly released to the atmosphere as it is. In addition, even if the fluid flow past the waste heat is directly utilized, the pollutants in the waste heat flow may become a problem.

Recently, however, various methods of recycling the waste heat have been developed as the research using the waste heat generated from the engine of the vehicle is progressed. In particular, when power is generated for exhaust waste heat, a Rankine cycle, a thermoelectric system and a turbo compounding system can be used, and a Rankine cycle can be applied to a cooling water waste heat.

The waste heat recovery method using the Rankine cycle can be more effective than other waste heat recovery systems since waste heat as well as cooling water waste heat can be utilized together. In general, the Rankine cycle is a thermodynamic cycle consisting of adiabatic compression, isobaric heating, monotonic expansion, and isostatic heat release, ie, a cycle of a heat engine consisting of two adiabatic changes and two equilibrium changes and the fluid accompanied by a phase change of gas and liquid It says. For example, in a Rankine cycle for recovering waste heat of an automobile, a working fluid of a high-pressure liquid is supplied with heat energy from a high-temperature exhaust gas through a high-temperature heat exchanger to become a high-temperature high-pressure gas (Single-phase expansion), and the low-temperature low-pressure gas is cooled through the low-temperature heat exchanger to convert the working fluid into a low-temperature liquid (equilibrium cooling), while the high- , The low-temperature liquid is converted into a high-pressure liquid by the pump and is conveyed (adiabatic compression). As a result, if the power generator of the Rankine cycle system is connected to the power shaft, the power generated by the Rankine cycle can be used as shaft power with the engine.

On the other hand, the scroll expander is mainly used for power generation by rotating the scroll expander as the high pressure fluid flows into the scroll expander due to the expansion of the monolithic thermal expansion during the Rankine cycle and obtains power from the rotation force of the scroll expander.

A conventional scroll expander is disclosed in Patent Document 1. The conventional scroll inflator has a fixed scroll 1 as shown in Fig. 1; Orbiting scroll (2); A suction portion 3; And a hole (4).

In the conventional scroll expander, the holes 4 formed in the fixed scroll 1 are selectively opened according to the amount of the refrigerant flowing into the suction portion 3. If the amount of the refrigerant is insufficient and sufficient expansion does not occur, the hole (4) is blocked to compensate for the amount of the refrigerant flowing into the expansion device relatively. When the amount of the refrigerant is excessive, the hole 4 is opened to increase the amount of refrigerant flowing into the inflator, thereby preventing over-expansion.

However, in the conventional scroll expander, there is a problem that rotation of the orbiting scroll 2 is difficult due to the pressure of the refrigerant that is initially expanded. To solve this problem, there is a problem that a motor is installed and additional power is required . In addition, there is a problem that two holes 4 are formed vertically around the suction part 3 to interfere with the rotation of the orbiting scroll 2.

JP 2005-030386 A (Feb. 3, 2005)

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above problems, and it is an object of the present invention to provide a scroll inflator having an inclined hole in a fixed scroll and having a central concave shape.

In order to solve the above problems, a scroll expander according to the present invention includes a suction chamber; housing; A stationary scroll fixed to the inside of the housing and having a suction port communicating with the suction chamber and having a spiral protruding from a center to form a flow path; The scroll expander according to any one of claims 1 to 3, further comprising a hole formed obliquely from the suction chamber side toward the flow passage side in the fixed scroll, the scroll expander including an orbiting scroll formed by protruding a spiral orbiting wrap meshing with the fixed lap to form at least one expansion pocket As a technical feature.

Further, the hole is moved away from the center of the fixed scroll toward the flow path side from the suction chamber side.

Further, a plurality of the holes are formed.

And the end portions of the fixed scroll and the orbiting scroll which are in contact with the stationary scroll and the orbiting scroll are respectively concave shapes.

And the flow path side end of the hole is located on the flow path.

The scroll inflator according to the present invention is able to efficiently generate electricity by complementing the initial rotation of the orbiting scroll without an additional power source, efficiently inducing the expansion of the fluid, and providing an improved turning force.

Also, the refrigerant flowing through the suction port can be easily introduced.

And the initial maneuvering power of the orbiting scroll can be improved.

Figure 1 shows a conventional scroll inflator
2 is an overall cross-sectional view of a scroll inflator according to the present invention
Figure 3 is an exploded perspective view of a scroll inflator according to the present invention;
Figure 4 is a front elevational view of the scroll inflator according to the invention
5 is a side cross-sectional view of a scroll inflator according to the invention
Figure 6 is an exploded perspective view of a scroll inflator according to the present invention;
Fig. 7 is an operating state diagram of the scroll inflator according to the present invention
Figure 8 is a block diagram illustrating a Rankine cycle in accordance with the present invention.

Hereinafter, a scroll inflator according to the present invention will be described in more detail with reference to the accompanying drawings.

Figure 3 is an exploded perspective view of a scroll inflator according to the invention, Figure 4 is a front section view of the scroll inflator according to the invention and Figure 5 is a front view of the scroll inflator according to the invention, Figure 5 is an exploded perspective view of the scroll inflator according to the invention, Fig. 6 is a perspective view of the scroll inflator according to the invention. Fig. 6 is a side elevation view of the scroll inflator according to the invention.

A scroll inflator according to the present invention comprises a suction chamber (10); A housing (20); And a fixed lap 32 fixed to the inside of the housing 20 and formed with a suction port 34 communicating with the suction chamber 10 and formed spirally protruding from the center to form a flow path 36, A fixed scroll (30); A scroll inflator comprising an orbiting scroll (40) in which a helical orbiting wrap (42) engaging with said stationary wrap (32) is formed to form at least one inflation pocket (44) And a hole 38 formed to be inclined from the suction chamber 10 side to the flow path 36 side.

Each component will be described in detail below.

The suction chamber 10 is installed to be coupled to the outer surface of the housing 20 at a location where the refrigerant flows from the evaporator 100.

The fixed scroll 30, the orbiting scroll 40, and the motor mechanism 50 are provided at one side of the housing 20, and a refrigerant inlet 24 through which the refrigerant flows from the discharge port 22 and the condenser 120 is provided. And is sealed from the outside.

The fixed scroll (30) is fixed to the inner surface of the housing (20) and communicates with the suction chamber (10). The fixed scroll (30) has a fixed lap (32) forming a spiral protrusion having a predetermined height from the center and the fixed lap (32) extends to the outer periphery to form a flow path (36). A suction port (34) is formed at the center of the fixed scroll (30), and a high-pressure gas-phase refrigerant flows through the suction port (34). At this time, the introduced high-pressure gaseous refrigerant undergoes adiabatic expansion while passing through the suction port (34).

On the other hand, on the bottom surface of the fixed scroll 30, as shown in FIG. 5, a hole 38 is formed to be inclined from the center to the outward direction. The high pressure refrigerant is injected into the hole 38 at a certain angle to push the orbiting wrap 42 and to increase the flow rate of the refrigerant passing through the flow path 36 of the fixed scroll 30. As a result, the increased flow rate of the refrigerant accelerates the rotation of the orbiting scroll 40, thereby reinforcing the rotation of the orbiting scroll 40.

Further, a plurality of holes 38 may be formed as necessary to further reinforce the rotation of the orbiting scroll 40.

The orbiting scroll 40 is formed with a orbiting wrap 42 forming a spiral protrusion having a predetermined height from the center so as to be engaged with the stationary wrap 32. The orbiting wrap 42 extends to the outer circumference to form a flow path 36 do. The orbiting scroll (40) has a phase difference of 180 degrees in a state of being meshed with the fixed scroll (30) and is rotatable relative to the fixed scroll (30).

The orbiting scroll 40 is formed by engaging the fixed scroll 30 and the expansion pocket 44 is defined as a space formed between the orbiting wrap 42 and the portion where the stationary wrap 32 abuts . That is, as the refrigerant introduced through the suction chamber 10 flows into the suction port 34 of the fixed scroll 30 and then expands as it passes the flow path 36, the orbiting scroll 40 is moved to the fixed scroll 30 The inflating pockets 44 are partially formed and then disappear because they are repeatedly attached and detached while turning around.

On the other hand, as shown in FIG. 6, the central end portion of the overlapping of the stationary wrap 32 and the orbiting wrap 42 forms a concave space in order to allow the coolant flowing through the inlet 34 to flow in more quickly It is for this reason. When the center of the stationary wrap 32 and the center of the orbiting wrap 42 are formed in close contact with each other as in a general scroll form, there is a problem that the time may be delayed to break through the gap. So that the initial maneuvering force can be improved.

As the above process is repeated, the refrigerant flowing into the suction port 34 is isothermally expanded while passing between the orbiting scroll 40 and the fixed scroll 30. The refrigerant expands through the outer peripheral surface of the fixed scroll (30) and is discharged through the discharge port (22) of the housing (20).

The motor mechanism portion 50 is a device in which the rotational force of the scroll expander is interlocked, and is installed by sharing a rotary shaft 52 integrally connecting the scroll expander and the refrigerant pump 130, which will be described later. Therefore, it is not necessary to construct a separate power generation device, which makes it possible to reduce the size and use it as a prime mover, thereby improving the fuel efficiency of the vehicle.

The operation of the scroll inflator according to the present invention will be described below.

7 is an operational state diagram of a scroll inflator according to the present invention.

As shown in Fig. 7 (a), the central portion of the fixed lap 32 and the orbiting lap 42 are engaged with each other to block most of the suction port 34. [ At this time, as the high-pressure refrigerant flows into the suction port 34 and is expanded, the central portion of the orbiting scroll 40 moves away from the center of the fixed scroll 30. As the refrigerant in the expansion pocket 44 expands, 40) starts to swing by the inflation pressure.

When the refrigerant flows into the inlet port 34 and begins to expand, the orbiting scroll 40 momentarily abuts between the fixed scroll 30 and the orbiting scroll 40 as shown in Fig. 7 (b) The face is opened. Accordingly, the expansion pockets 44 formed in Fig. 7 (a) are opened and the refrigerant is moved along the flow path 36 by the expanding force of the refrigerant. At this time, the high-pressure refrigerant flows into the holes 38 formed in the fixed scroll 30, so that the flow of the refrigerant existing in the flow path 36 is increased more rapidly, and the rotation of the orbiting scroll 40 is further accelerated .

The orbiting scroll 40 is further rotated to form a new expansion pocket 44 as shown in Fig. 7 (c). Accordingly, the refrigerant in the expansion pocket 44 formed near the outer side is discharged to the outside of the scroll expander, and the orbiting scroll 40 is rotated repeatedly as the new high-pressure refrigerant flows in.

The Rankine cycle in which the scroll inflator is applied is described below.

Figure 8 is a block diagram illustrating a Rankine cycle in accordance with the present invention.

The evaporator 100 serves to vaporize the liquid refrigerant flowing through the refrigerant pump 130 into a high-temperature and high-pressure state and supply it to the inflator 110. The evaporator 100 performs heat exchange between the cooling water of the engine and the exhaust gas and the liquid-phase refrigerant to vaporize the liquid-phase refrigerant into a high-temperature and high-pressure state.

The inflator 110 generates kinetic energy by using the pressure of expansion of the refrigerant to the place where the vaporized refrigerant is expanded by receiving heat from the evaporator 100. Generally, a turbine is used to generate power, but a scroll expander according to the present invention is used instead of a turbine. In other words, as the refrigerant introduced into the scroll expander expands inside the scroll expander, the orbiting scroll 40 is rotated, and power can be generated by using the rotational force of the orbiting scroll 40 to generate electricity.

The condenser 120 is generally installed in the front portion of the vehicle in the form of a cooling module such as a radiator, and is cooled by circulating cooling water for reducing the heat of the engine. Likewise, the condenser 120 is a place for reducing the heat of the gas expanded in the expander 110, and the refrigerant that has been in the gaseous state by liquefying the isobaric liquid is circulated in the Rankine cycle.

The refrigerant pump 130 is a place for adiabatically compressing the liquefied refrigerant. The refrigerant pump 130 supplies the condensed liquid refrigerant from the condenser 120 to the evaporator 100. The Rankine cycle is circulated by the force of the refrigerant compressed by the refrigerant pump 130 and is converted into kinetic energy by the expander 110. [

10: suction chamber 20: housing
22: Discharge port 24: Refrigerant inlet port
30: fixed scroll 32: stationary wrap
34: inlet port 36:
38: Hall 40: Turning scroll
42: orbital wrap 44: inflation pocket
50: motor mechanism part 52:
100: evaporator 110: expander
120: condenser 130: refrigerant pump

Claims (5)

A suction chamber (10); A housing (20); And a fixed lap 32 fixed to the inside of the housing 20 and formed with a suction port 34 communicating with the suction chamber 10 and formed spirally protruding from the center to form a flow path 36, A fixed scroll (30); A scroll inflator comprising an orbiting scroll (40) in which a spiral orbiting wrap (42) engaging with said stationary wrap (32) is formed to form at least one inflation pocket (44)
And a hole (38) formed in the fixed scroll (30) so as to be inclined from the suction chamber (10) side toward the flow path (36) side.
The method according to claim 1,
And the hole (38) is away from the center of the fixed scroll (30) toward the flow path (36) side from the suction chamber (10) side.
The method according to claim 1 or 2,
Wherein a plurality of the holes (38) are formed.
The method according to claim 1,
Wherein the end portions of the stationary scroll (32) and the orbiting wrap (42) which are in contact with the center of the fixed scroll (30) and the orbiting scroll (40) have a concave shape.
The method according to claim 1,
And the end of the hole (38) on the flow path (36) side is located on the flow path (36).

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