WO2013024976A1

WO2013024976A1 - Reciprocating compressor

Info

Publication number: WO2013024976A1
Application number: PCT/KR2012/005917
Authority: WO
Inventors: 이건호; 김학수
Original assignee: 두원공과대학교; 주식회사 두원전자
Priority date: 2011-08-17
Filing date: 2012-07-25
Publication date: 2013-02-21
Also published as: KR101333039B1; KR20130019743A

Abstract

The present invention pertains to a new reciprocating compressor, wherein unbalanced force due to the rotational motion of the conventional crank arm and connecting rod is resolved, and a piston carries out precise rectilinear motion along the inside wall of a cylinder so as to prevent the abrasion of the wall of the cylinder, preventing the counter-flow and leakage of compressed fluid. To this end, the present invention includes: a housing which has a suction hole formed at one side of an upper portion thereof so as to introduce fluid; an operation cylinder which rotates with respect to the internal center of the housing, and has a guide groove that is continuously formed in the shape of a sine curve in the circumferential direction on the outer periphery thereof and a communication hole that is formed at one side of the upper portion so as to selectively communicate with the suction hole; a fixed pin which is fixed at the housing in surface-contact with the guide groove in the state that the fixing pin is inserted to the inside of the guide groove; a fixed cylinder which shares the internal center of the housing with the operation cylinder inside the operation cylinder and has a through hole facing the suction hole; a piston which is inserted into the inside of the fixed cylinder so as to carry out rectilinear reciprocation and has a piston rod provided at the lower end portion thereof; and a power transmission means which is positioned at the lower end portion of the housing and applies rotational force to the operation cylinder.

Description

Reciprocating compressor

The present invention relates to a reciprocating compressor, and more particularly, to a reciprocating compressor for compressing a fluid in a cylinder by a reciprocating motion of a piston.

In general, an air conditioner includes a compressor for compressing a refrigerant gas at a high temperature and a high pressure to perform a cooling cycle, a condenser for gradually condensing the high temperature and high pressure refrigerant gas from the compressor into a liquid phase through heat discharge, from the condenser An expansion valve for lowering the pressure of the liquid refrigerant to form a mixed refrigerant consisting of low temperature gas and liquid, and an evaporator for evaporating the mixed refrigerant to absorb ambient heat and sending the evaporated refrigerant back to the compressor. .

In particular, the compressor serves to compress the low pressure refrigerant gas of the evaporator to a high pressure to deliver to the condenser.

As shown in FIG. 1, a representative reciprocating compressor according to the prior art reciprocates as the connecting rod 3 rotates in accordance with the rotation of the crank arm 1 when the crank arm 1 that receives the power of the motor rotates. Since the piston 5 is also reciprocated, the fluid inside the cylinder is compressed and sucked.

However, the reciprocating compressor according to the prior art as described above has a problem that a radial imbalance occurs due to the rotation of the crank arm 1 and the connecting rod 3.

In order to remove the imbalance force caused by the rotation of the crank arm 1 and the connecting rod 3 as described above, a balance weight (not shown) having the same load as the crank arm 1 and the connecting rod 3 is provided. It is attached to the crank arm 3.

Thus, the unbalance centrifugal force due to the rotational movement of the crank arm 1 and the connecting rod 3 can be canceled through the balance weight, but the reciprocating motion of the piston assembly including the piston 5 and the connecting rod 3 There is a problem in that the axial imbalance force remains as it is and generates vibration in the compressor.

In addition, the reciprocating compressor according to the prior art, when raising the piston (5) to compress the fluid introduced into the cylinder (9), because the connecting rod (3) for pushing up the piston (5) is inclined 5) the unnecessary force is applied to the inner wall of the cylinder 9, and the inner wall of the cylinder 9 and the piston 5 are worn, which causes a problem in that the fluid in the cylinder 9 leaks to the outside.

In order to solve the wear of the cylinder 9 and the piston 5 and the fluid leakage in the cylinder 9 as described above, the connecting rod 3 and the piston ( By adopting a structure equipped with a cross head (not shown) for supporting the engaging portion of 5), it is possible to prevent the force of the piston 5 directly from the inner wall of the cylinder (9), but such a structure is a reciprocating compressor Increasing the manufacturing cost of the compressor and there was a problem that the vibration and noise of the compressor remain intact.

Accordingly, the present invention has been made to solve the above problems, an object of the present invention, as well as solve the imbalance force caused by the rotational movement of the conventional crank arm and connecting rod, as well as the piston along the cylinder inner wall It is to provide a new reciprocating compressor that can be precisely linear to prevent wear of the cylinder wall to prevent back flow and outflow of the pressurized fluid.

In order to achieve the above object, a reciprocating compressor according to a first embodiment of the present invention includes: a housing having a suction port through which a fluid is introduced into an upper one side; An operating cylinder rotating around the inner center of the housing and continuously forming a sinusoidal guide groove in the circumferential direction on an outer circumference thereof, and having a communication port selectively communicating with the suction port on an upper side thereof; A fixed pin fixed to the housing and in surface contact with the guide groove; A fixed cylinder having a through hole which shares an inner center of the housing with the working cylinder and is opposite to the inlet, inside the working cylinder; A piston inserted into the fixed cylinder and linearly reciprocating and having a piston rod at a lower end thereof; And positioned on the lower end of the housing, characterized in that it comprises a power transmission means for imparting a rotational force to the working cylinder.

Reciprocating compressor according to a second embodiment of the present invention, the housing is formed with a suction inlet fluid is introduced into the upper one side; An operating cylinder rotating about an inner center of the housing and continuously forming a sinusoidal guide groove in a circumferential direction on an inner circumference thereof, and having a communication port selectively communicating with the suction port on an upper side thereof; A fixed cylinder having a through hole which shares an inner center of the housing with the working cylinder and is opposite to the inlet, inside the working cylinder; A fixed pin fixed to the fixed cylinder and in surface contact with the guide groove; A piston inserted into the fixed cylinder and linearly reciprocating and having a piston rod at a lower end thereof; And positioned on the lower end of the housing, characterized in that it comprises a power transmission means for imparting a rotational force to the working cylinder.

The fixing pin is located on the path of the guide groove, characterized in that fixed to the middle position of the highest point and the lowest point of the guide groove.

The guide groove is formed so that the piston reciprocates twice while the working cylinder is rotated once.

The piston is characterized in that the circumferential surface is provided with a piston ring in close contact with the inner wall of the fixed cylinder.

The power transmission means, the drive motor for supplying rotational power; A motor shaft connected to the drive motor to exert a rotational force; Is coupled to the motor shaft is characterized in that consisting of the axial connection rod which is slidable in the axial direction while rotating.

A shaft groove having a predetermined depth is formed on the upper side of the motor shaft along a longitudinal direction thereof, and the shaft groove is inserted into the shaft groove so as to rotate together with the motor shaft and simultaneously move along the axial direction.

Between the shaft connecting rod and the piston rod is characterized in that the bearing is installed so that the piston idles with respect to the rotating shaft connecting rod.

The inside of the housing is characterized in that the valve is provided to perform the function of discharging the fluid to the outside of the housing when the fluid is compressed by the piston to reach a predetermined pressure after the fluid is introduced.

According to the reciprocating compressor according to the present invention having the configuration as described above, since the rotational motion of the drive motor is converted into a linear reciprocating motion of the working cylinder and the piston, an imbalance force by the rotational motion of the crank arm and the connecting rod according to the prior art There is an effect that can solve.

In addition, since the piston moves along the inner wall of the fixed cylinder exactly linearly with the working cylinder, it is possible to eliminate the vibration and shock caused by the reciprocating motion of the piston according to the prior art to maintain a stable operating state of the compressor In addition, since the wear of the fixed cylinder and the piston is suppressed and the fluid is prevented from leaking to the outside, the durability and the compression efficiency of the compressor are improved.

1 is a schematic view showing a reciprocating compressor according to the prior art.

2 is a cross-sectional view showing a reciprocating compressor according to a first embodiment of the present invention.

3 is a perspective view showing an operating cylinder of the reciprocating compressor according to the first embodiment of the present invention.

Figure 4 is a graph showing the path of the guide groove formed in the working cylinder of the reciprocating compressor according to the first embodiment of the present invention.

5 is a cross-sectional view showing a reciprocating compressor according to a second embodiment of the present invention.

6 and 7 are operation diagrams showing an operating state of the reciprocating compressor according to the first embodiment of the present invention.

Hereinafter, the configuration of the present invention with reference to the accompanying drawings in detail.

2 is a cross-sectional view illustrating a reciprocating compressor according to a first embodiment of the present invention, FIG. 3 is a perspective view showing an operating cylinder of the reciprocating compressor according to the first embodiment of the present invention, and FIG. It is a graph showing the path of the guide groove formed in the working cylinder of the reciprocating compressor according to the first embodiment of the present invention.

The reciprocating compressor according to the present invention compresses the fluid in the cylinder by the reciprocating motion of the piston 14, as shown in FIG. 2, in which a housing 10 for protecting the inside of the compressor is installed. Inlet 10a through which fluid is introduced is formed at one side.

An operating cylinder 11 is installed inside the housing 10 to rotate with respect to the inner center thereof.

As shown in FIG. 3, the working cylinder 11 is formed in a cylindrical shape in which a guide groove 11a of a sinusoidal shape is formed continuously in the circumferential direction at an outer circumference thereof, and an axial connecting rod 16 is described below at the lower end thereof. Is coupled to

In addition, a communication port 11b that is selectively communicated with the suction port 10a is formed at one upper side of the working cylinder 11.

In addition, the guide groove 11a is provided with a fixing pin 12 which is fixed to penetrate from the outside of the housing 10 and inserted into the guide groove 11a to be in surface contact. The position of the fixing pin 12 is located on the path of the guide groove 11a, and is preferably fixed at an intermediate position of the highest point and the lowest point of the guide groove 11a.

At this time, the guide groove (11a) formed in the working cylinder 11, as shown in Figure 4, when the radius of the working cylinder 11, the amplitude of A, the sine having a period of 2πR / 2 It is formed to have a curved shape, and the stroke distance is 2A while the working cylinder 11 rotates for one cycle.

In other words, the piston is reciprocated twice while the working cylinder is rotated once.

In addition, a fixed cylinder 13 is installed inside the working cylinder 11 and has a through hole 13a that shares the inner center of the working cylinder 11 and the housing 10 and faces the inlet 10a. It is.

The fixed cylinder 13 is provided at some interval from the working cylinder 11 so that the rotational movement of the working cylinder 11 is not affected.

The piston 14 is inserted into the fixed cylinder 13 to linearly reciprocate and has a piston rod 14a connected to the lower end thereof.

The circumferential surface of the piston 14 is provided with a piston ring 14b formed to be in close contact with the inner wall of the fixed cylinder 13 to transmit a higher compressive force to the fluid inside the housing 10, and the piston 14 Alternatively, a plunger can be installed.

In this way, the working cylinder 11 provided in the housing 10 is rotated by a power transmission means located at the lower end of the housing 10.

The power transmission means includes a drive motor (not shown) for supplying rotational power, a motor shaft 15 connected to the drive motor to exert rotational force, and a motor shaft 15 coupled to the motor shaft 15 to rotate in an axial direction. It consists of a movable shaft connecting rod 16.

Here, the coupling relationship between the motor shaft 15 and the shaft connecting rod 16 will be described in detail. An upper side of the motor shaft 15 has a shaft groove 15a having a constant depth along the longitudinal direction thereof. In addition, the shaft connecting rod 16 is inserted into the shaft groove 15a so that the shaft connecting rod 16 can rotate together with the motor shaft 15 and move along the axial direction.

In addition, a groove 16a having a predetermined depth is formed along the longitudinal direction of the shaft connecting rod 16, and a piston rod 14a connected to the piston 14 is inserted into the groove 16a. The axial connecting rod 16 is movable in the axial direction.

Here, the axial connecting rod 16 rotates in the axial direction while simultaneously rotating with the motor shaft 15, while the piston rod 14a does not rotate with the axial connecting rod 16 but only in the axial direction. Only formed to move.

To this end, the axial connecting rod 16 and the piston rod 14a are substantially frictionless and the axial connecting rod 16 and the piston so that the piston 14 idles against the rotating axial connecting rod 16. A bearing 17 is provided between the rods 14a to provide a lubrication function.

Here, the piston rod 14a, the motor shaft 15, and the shaft connecting rod 16 maintain a coupling relationship separated from each other, all of which are coaxial.

On the other hand, when the fluid is introduced into the housing 10 and the fluid is compressed by the piston 14 to reach a predetermined pressure to perform a function for discharging the fluid to the outside of the housing 10 ( Not shown).

Meanwhile, FIG. 5 shows a second embodiment of the reciprocating compressor according to the present invention. Specifically, the position of the guide groove 11a of the working cylinder 11 and the surface of the guide groove 11a are inserted into the guide groove 11a. As an example in which the positions of the fixing pins 12 are different, the same reference numerals are given to the same parts as those described in the first embodiment of the present invention.

Here, the guide groove (11a ') is formed in the circumferential direction of the guide groove (11a') in the circumferential direction on the inner circumference of the working cylinder 11, is inserted into the guide groove (11a ') surface contact The fixed pin 12 ′ is fixed to a predetermined position of the fixed cylinder 13.

The position of the fixing pin 12 'is positioned on the path of the guide groove 11a' as in the first embodiment, and preferably in the middle position of the highest point and the lowest point of the guide groove 11a '. It is natural to be fixed.

Hereinafter, the operation of the reciprocating compressor according to the present invention configured as described above is as follows.

6 and 7 are operational diagrams showing an operating state of the reciprocating compressor according to the first embodiment of the present invention. FIG. 6 shows a state in which fluid is sucked in a state where the piston 14 is located at the lowest point. 7 shows a state in which the fluid is compressed with the piston 14 positioned at the highest point.

First, the motor shaft 15 is rotated by the power of the drive motor which is the power transmission means.

At the same time, the shaft connecting rod 16 is rotated, the working cylinder 11 receives the rotational force of the shaft connecting rod 16.

When the working cylinder 11 is rotated by the power transmission means, the housing 10 is drawn by the guide groove 11a and also the sinusoidal curve shown in FIG. 4 by the fixing pin 12 of the first and second embodiments. Sliding along the inner wall results in a reciprocating motion along the axial direction.

Accordingly, the shaft connecting rod 16 also rotates in the vertical direction along the shaft groove 15a of the motor shaft 15 while rotating.

In addition, the piston 14 inserted into the groove 16a of the shaft connecting rod 16 through the piston rod 14a prevents rotational movement by the bearing 17 when the shaft connecting rod 16 rotates. Reciprocating motion only in the vertical direction.

At this time, when the working cylinder 11 and the piston 14 are located at the lowest point of the housing 10, the inlet port 10a through which fluid is introduced and the communication port 11b of the working cylinder 11 communicate with each other. Fluid enters the housing 10.

On the contrary, when the working cylinder 11 and the piston 14 are located at the top of the housing 10, the inlet 10a and the communication port 11b of the working cylinder 11 do not communicate. The interior of the housing 10 is hermetically sealed, and the fluid introduced into the housing 10 is compressed by the piston 14.

Thereafter, when the fluid is compressed by the piston 14 to reach a predetermined pressure, the fluid is discharged to the outside of the housing 10.

The reciprocating compressor having the operating principle as described above is to convert the rotational motion of the drive motor into a linear reciprocating motion of the working cylinder 11 and the piston 14 to cancel the vibration and shock, thereby operating state of the compressor Is maintained stably, the wear of the fixed cylinder 13 and the piston 14 is prevented so that the fluid does not leak to the outside to improve the durability performance and compression efficiency of the compressor.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and the present invention is not limited to the gist of the present invention as defined in the claims. Various modifications by the person also fall within the claims of the present invention.

Claims

A housing formed with a suction port through which the fluid is introduced;

An operating cylinder rotating around the inner center of the housing and continuously forming a sinusoidal guide groove in the circumferential direction on an outer circumference thereof, and having a communication port selectively communicating with the suction port on an upper side thereof;

A fixed pin fixed to the housing and in surface contact with the guide groove;

A fixed cylinder having a through hole which shares an inner center of the housing with the working cylinder and is opposite to the inlet, inside the working cylinder;

A piston inserted into the fixed cylinder and linearly reciprocating and having a piston rod at a lower end thereof; And,

Located in the lower end of the housing, the reciprocating compressor comprising a power transmission means for imparting a rotational force to the working cylinder.
A housing formed with a suction port through which the fluid is introduced;

An operating cylinder rotating about an inner center of the housing and continuously forming a sinusoidal guide groove in a circumferential direction on an inner circumference thereof, and having a communication port selectively communicating with the suction port on an upper side thereof;

A fixed cylinder having a through hole which shares an inner center of the housing with the working cylinder and is opposite to the inlet, inside the working cylinder;

A fixed pin fixed to the fixed cylinder and in surface contact with the guide groove;

A piston inserted into the fixed cylinder and linearly reciprocating and having a piston rod at a lower end thereof; And,

Located in the lower end of the housing, the reciprocating compressor comprising a power transmission means for imparting a rotational force to the working cylinder.
The method according to claim 1 or 2,

The fixing pin is located on the path of the guide groove, the reciprocating compressor, characterized in that fixed to the intermediate position of the highest point and the lowest point of the guide groove.
The method according to claim 1 or 2,

And the guide groove is formed so that the piston reciprocates twice while the working cylinder is rotated once.
The method according to claim 1 or 2,

The piston is a reciprocating compressor, characterized in that the peripheral surface is provided with a piston ring in close contact with the inner wall of the fixed cylinder.
The method according to claim 1 or 2,

The power transmission means,

A drive motor for supplying rotational power;

A motor shaft connected to the drive motor to exert a rotational force;

And a shaft connecting rod coupled to the motor shaft and slidably moved in the axial direction while being rotated.
The method of claim 6,

An axial groove having a predetermined depth is formed in the upper side of the motor shaft along the longitudinal direction, and the axial groove is inserted into the shaft groove so as to rotate together with the motor shaft and simultaneously move along the axial direction. compressor.
The method of claim 6,

And a bearing is installed between the shaft connecting rod and the piston rod so that the piston idles with respect to the rotating shaft connecting rod.
The method according to claim 1 or 2,

The inside of the housing is a reciprocating compressor characterized in that the valve is performed to discharge the fluid to the outside of the housing when the fluid is compressed by the piston to reach a predetermined pressure after the fluid is introduced.