KR100608863B1 - Bypass valve structure of rotary compressor - Google Patents

Abstract

The present invention relates to a bypass valve structure of a rotary compressor, and more particularly, to the bypass valve structure of a rotary compressor modularized by using a ball valve, a ball valve guide, a support spring, and a fixed spring. It is about. In the conventional bypass valve structure, the gasket, the valve seat, the valve, the valve guide, the spring fixing groove, and the spring are assembled in the order of the combination of the valve guide and the spring. . However, in the bypass valve structure according to the present invention, it is possible to improve productivity by simplifying the assembly process through modularization of the bypass valve, and to prevent defects that may occur due to the loss of the valve plate in the assembly process, and also in the related art. In the bypass valve structure, there is an effect of reducing the valve vibration noise generated when switching modes and increasing the efficiency of the compressor.

Description

BYPASSVALVE STRUCTURE OF ROTARY COMPRESSOR}

1 is a cross-sectional view showing a gas flow in a conventional rotary compressor structure and operation mode,

2 is a cross-sectional view showing the structure of a conventional compression mechanism part;

3 is a cross-sectional view showing a conventional bypass valve structure;

4 is a cross-sectional view showing a bypass valve structure of the present invention;

5 is a cross-sectional view showing a bypass valve module structure using a ball valve of the present invention,

Figure 6 is a cross-sectional view showing another embodiment of the present invention.

** Description of the symbols for the main parts of the drawings **

10: sealed container 11: suction pipe

12: discharge pipe 15: connection pipe

16: bypass hole 17: refrigerant switching valve

20: power mechanism 21: stator

22: rotor 30: compressor section

32: main bearing 33: sub-bearing

35: rolling piston 36: vane

38: discharge valve assembly 39: muffler

40: cylinder 41: vaneslit

42: suction port 43: discharge port

44: discharge guide groove 45: valve receiving groove

200: bypass valve 210: gasket

235: spring projection 240: gas discharge groove

245: first thread 250: spring fixing groove

255: second thread 260: fixed spring

270: through hole 280: ball valve guide

290 ball valve

The present invention relates to a bypass valve structure of a rotary compressor, and more specifically, the structure inside the bypass valve using a ball valve, a ball valve guide, a support spring, a fixed spring, and a modularized assembly process. It relates to a bypass valve structure of a rotary compressor that can shorten and improve productivity.

Generally, a compressor is a machine that compresses a fluid. This type of compressor is divided into a reciprocating compressor, a rotary compressor, a scroll compressor, and the like.

The rotary compressor is a structure that compresses the gas while the eccentric portion is eccentric movement in the cylinder by receiving the driving force of the electric mechanism, the scroll compressor compresses the gas while the orbiting scroll engaged with the fixed scroll receives the driving force of the electric mechanism. Structure. The reciprocating compressor may be configured to compress the gas while the piston is linearly reciprocated in the cylinder by receiving the rotational force of the electric mechanism, or to compress the gas while the piston is linearly reciprocated in the cylinder by receiving the linear reciprocating drive force of the electric mechanism. Structure.

1 is a cross-sectional view showing a conventional rotary compressor structure and the gas flow in the operation mode, Figure 2 is a cross-sectional view showing a conventional compression mechanism structure, Figure 3 is a cross-sectional view showing a conventional bypass valve structure.

As shown in the drawing, the compressors as described above are sealed container 10, the power transmission unit 20 is mounted inside the sealed container 10 to generate a driving force, and penetrates the sealed container 10 to the inside. A suction pipe (11) for sucking cold air, a compressor mechanism (30) for receiving the driving force of the electric mechanism (20) and communicating with the suction pipe (11) to compress the supplied gas, and the sealed container (10). The discharge pipe 12 is provided to guide the gas penetrated by the compression mechanism 30 to the condenser side.

The power mechanism 20 is fixed to the inside of the airtight container 10 to apply power from the outside and the stator 21 is arranged with a certain gap inside the stator 21 while interacting with the stator 21 It consists of a rotating rotor (22).

Compressor part 30 is formed in an annular shape and installed in the casing cylinder 40, the main bearing 32 and the sub-bearing 33 and the upper and lower sides of the cylinder 40 to form an inner space together; The rotary shaft 34 is press-fitted to the rotor 22 and supported by the main bearing 32 and the sub bearing 33 to transmit rotational force, and is rotatably coupled to an eccentric portion of the rotary shaft 34 so that the cylinder 40 The rolling piston 35 which rotates in the inner space and compresses the refrigerant, and is coupled to the cylinder 40 so as to be pressed against the outer circumferential surface of the rolling piston so as to be movable in a radial direction, so that the inner space of the cylinder 40 is connected to the suction chamber. A discharge valve assembly 38 which is connected to the vane 36 partitioned into the compression chamber and the discharging port 37 provided near the center of the main bearing 32 so as to be opened and closed to limit the refrigerant gas discharged from the compression chamber; The resonance chamber to accommodate the discharge valve assembly 38 Compared with the muffler 39 is provided on the outer surface of the main bearing (32).

In addition, the suction side bypass pipe 13 is piped in the middle of the gas suction pipe SP, and the discharge side bypass pipe 14 is piped in the middle of the gas discharge pipe DP, and the suction side bypass pipe is connected. The pipe 13 and the discharge side bypass pipe 14 are connected to the bypass hole 16 by a connecting pipe 15, and the suction side bypass pipe 13 and the discharge side bypass pipe 14 and the connection pipe 15 ) Is connected by a refrigerant switching valve (17) consisting of a three-way valve.

The cylinder 40 is formed in an annular shape so that the rolling piston 35 can move relative to each other, as shown in FIG. 2, and at one side thereof, the vane 36 has a vane slit 41 to linearly move in a radial direction. On the other side of the vane slit 41 is formed through the inlet port 42 communicating with the gas suction pipe (SP) in the radial direction, while the discharge port of the main bearing 32 on the other side of the vane slit (41) The discharge guide groove 44 is formed so as to communicate with 37 to induce the discharge of the refrigerant gas, and bypasses a part of the refrigerant gas that is compressed around 210 ° from the vane slit 41 toward the suction port 42. The bypass hole 16 is formed, and the valve receiving groove 45 for inserting the valve seat 120 is formed at the outlet side of the bypass hole 16.

The conventional bypass valve 100 is in close contact with the interface between the bypass hole 16 and the valve receiving groove 45 to close the gasket 110 and the gasket 110 as shown in FIG. 3. The valve seat 120 to form a valve surface, a valve plate 130 for controlling the bypass of compressed gas while being attached to and detached from the valve face of the valve seat 120, and a valve seating surface 190. It consists of a valve guide 140 for limiting the opening amount of the plate 130, and a valve spring 160 for supporting the valve guide 140.

The valve guide 140 protrudes from the edge of the support protrusion 180 to closely contact the valve seat 120, and the compressed gas passing through the bypass hole 16 is connected between the support protrusion 180. Through hole 170 is formed to be discharged to (15). The diameter of the through hole 170 is larger than the diameter of the bypass hole 16 so that the valve plate 130 can be kept closed by the back pressure in the maximum operation mode. In addition, a valve seating surface 190 is formed at the center of the valve guide 140 such that the valve plate 130 is guided and seated on the support protrusion 180.

The valve spring 160 is formed of a compression coil spring, but the wire rod at the outer end thereof is wound wider than the diameter of the other wire rod so as to be fitted into a spring groove provided on the inner circumferential surface of the valve accommodation groove 45.

The conventional rotary compressor as described above operates as follows.

When the rotor 22 rotates by applying power to the stator 21 of the electric mechanism part, the rotating shaft 34 of the compression mechanism part rotates together with the rotor 22, and the rolling piston 35 of the cylinder 40 Eccentric rotation in the inner space, the refrigerant gas is sucked into the suction chamber in accordance with the eccentric rotation of the rolling piston 35 is continuously compressed to a certain pressure, the moment the compression chamber pressure is higher than the pressure in the casing discharge of the main bearing 32 Discharged into the casing through the port 37 and the muffler 39.

Here, as shown in FIG. 1, the refrigerant switching valve 17 is adjusted to communicate with the connecting pipe 15 and the discharge side bypass pipe 14 when the compressor is operated in the maximum operation mode at the initial operation of the compressor. The high pressure discharge gas supplied through the bypass pipe 14 passes through the through hole 170 of the valve guide 140 and pressurizes the valve plate 130 so that the valve plate 130 becomes a valve of the valve seat 120. It is compressed on the surface to block the bypass hole 16 of the cylinder 40, through which the entire refrigerant gas in the compression chamber is discharged to the casing through the discharge port 37 of the main bearing 32 is discharged to the refrigeration cycle apparatus. .

On the other hand, when the operation of the compressor is stable and the operation is performed in the minimum operation mode, the refrigerant switching valve 17 is adjusted so that the connecting pipe 15 and the suction side bypass pipe 13 communicate with each other. The low pressure suction gas supplied through 13 passes through the through hole 170 of the valve guide 140 to support the valve plate 130, but the pressure supporting the valve plate 130 is the gas pressure of the compression chamber. Lower than the valve plate 130 is pushed toward the valve guide 140, the bypass hole 16 is opened and a portion of the refrigerant gas compressed through the bypass hole 16 is the bypass hole 16 and the valve guide ( By discharging through the through-hole 170 of the 140, the amount of refrigerant gas discharged from the compression chamber is reduced while lowering the cooling capacity of the air conditioner.

However, the bypass valve 100 structure of the conventional rotary compressor, as the valve plate 130 is opened and closed only by the pressure difference between the two sides, especially in each bypass pipe 13, 14 when switching the operation mode. The acting pressure instantaneously forms the equilibrium pressure between the intake and discharge, causing the valve vibration noise, or as the rotation angle of the rotary shaft 34 approaches near the discharge start time, the equilibrium pressure or the differential pressure between the intake and discharge decreases, which in turn causes the valve vibration noise. There has been a problem of increasing the noise of the compressor.

In addition, the structure of the bypass valve 100 as described above is not only complicated, but there is a problem in that the productivity is reduced by allowing each component to be assembled individually.

In addition, the valve plate 130 is detached while being in surface contact with the valve surface of the valve seat 120, there is a risk that the refrigerant gas leaks, as well as the volume of the valve seat 120, so that the compressor efficiency is also lowered there was.

The present invention has been made in view of the problems of the bypass valve of the conventional rotary compressor as described above, by changing the structure of the bypass valve using a ball valve, ball valve guide, support spring, fixed spring, and modularization This simplifies the assembly process and increases productivity.

Another object of the present invention is to provide a bypass compressor structure of a rotary compressor which can reduce compressor valve vibration noise by minimizing valve vibration noise generated when switching modes in the conventional bypass valve structure.

Another object of the present invention is to provide a bypass valve structure of a rotary compressor that can increase the efficiency of the compressor by reducing the dead volume of the bypass valve and preventing refrigerant leakage by the structure using the ball valve and the support spring.

In order to achieve the object of the present invention, the present invention forms a bypass hole so that a portion of the refrigerant gas compressed on one side of the cylinder is bypassed, opening and closing the bypass hole in the valve receiving groove communicated with the bypass hole. In the bypass valve structure of the rotary compressor to the valve is provided to vary the capacity of the compressor, the ball is fixed to the valve receiving groove of the cylinder and the through-hole communicating with the bypass hole and the gas discharge groove for the refrigerant gas is discharged A valve guide; A ball valve provided inside the ball valve guide to open and close the bypass hole according to a pressure difference between the bypass hole and the valve receiving groove; A support spring fixed to the ball valve guide and elastically supporting the ball; It provides a bypass valve structure of the rotary compressor comprising a fixing means for fixing the ball valve guide in the valve receiving groove.

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Hereinafter, the bypass valve structure of the rotary compressor according to the present invention will be described in detail based on the embodiment shown in the accompanying drawings.

Figure 4 is a side cross-sectional view showing a bypass valve structure of the rotary compressor of the present invention, Figure 5 is a cross-sectional view showing a bypass valve module structure using a ball valve of the present invention, Figure 6 is another embodiment of the present invention It is a cross section shown.

1 and 2, the rotary compressor according to the present invention includes a cylinder 40 and a cylinder 40 fixedly installed in the sealed container 10 and forming a bypass hole 16 on one side thereof. The main bearing 32 for radially supporting the rotating shaft 34 coupled to the rotor 22 of the driving motor and the other side of the cylinder 40 are covered together to form an inner space by covering one side thereof. The cylinder 40 is rotatably coupled to the sub-bearing 33 which forms a space and supports the eccentric portion of the rotating shaft 34 in the axial direction while supporting the lower end in the radial direction, and the eccentric portion of the rotating shaft 34. Rolling piston 35 for compressing the refrigerant gas sucked through the inlet of the vane and the vane slidingly coupled to the vane slit 41 of the cylinder 40 to be radially interlocked by contact with the outer circumferential surface of the rolling piston 35 ( 36).

In addition, the gas suction pipe SP communicates with the suction port of the cylinder 40 to suck the refrigerant gas into the internal space from the evaporator of the refrigeration cycle device, and the refrigerant gas compressed and discharged from the cylinder 40 by communicating with the casing. The gas suction pipe DP discharged to the condenser of the cycle apparatus and the suction side bypass pipe 13 which are connected in the middle of the gas suction pipe SP and selectively communicate with the bypass hole 16 of the cylinder 40 described above. ), A discharge side bypass pipe 14 which is branched in the middle of the gas discharge pipe DP and selectively communicates with the bypass hole 16 of the cylinder 40, and a suction side bypass pipe 13 and a discharge side. Connecting pipe 15 is connected to the valve receiving groove 45 of the cylinder 40 by connecting the bypass pipe 14, the suction side bypass pipe 13 and the discharge side bypass pipe 14 and the connection A refrigerant switching valve (17) installed between the pipes (15) to switch the flow of refrigerant gas, and a bypass It further includes a bypass valve 200 for selectively opening and closing the hole 16.

The cylinder 40 is formed in an annular shape so that the rolling piston 35 can move relatively, and on one side thereof, the vane 36 forms a vane slit 41 to linearly move in a radial direction, and a vane slit. One side of the (41) is formed through the inlet port communicating with the gas suction pipe (SP) in the radial direction, while the other side of the vane slit (41) in communication with the discharge port 37 of the main bearing (32) of the refrigerant gas A discharge guide groove 44 is formed to induce discharge, and a bypass hole 16 for discharging a part of the compressed refrigerant gas is formed at about 210 ° in the direction of the inlet from the vane slit 41. On the outlet side of the hole 16, a valve receiving groove 45 for inserting the valve seat 120 is formed.

The bypass valve 200 includes a ball valve 290 processed in a spherical shape, a ball valve guide 280 for accommodating the ball valve 290, a support spring 220 for supporting the ball valve 290, and In addition, the ball valve guide 280 is formed to include a fixed spring (260) for fixing in the valve receiving groove (45).

The ball valve guide 280 is to induce a surface contact with the ball valve 290 by processing the contact surface with the ball valve 290 to increase the efficiency of the compressor, and to reduce the fluid resistance when opening the ball valve 290 The gas discharge groove 240 penetrates the upper and lower inner circumferential surfaces of the ball valve guide 280 and forms a through hole 270 in the center of the front surface of the inner circumferential surface.

The ball valve guide 280 induces a line contact with the ball valve 290 by processing the contact surface with the ball valve 290 in a flat plane to facilitate the processing to reduce the production cost.

In addition, the ball valve guide 280 is the outer circumferential surface press-fitted by the fixed spring 260 to fix the ball valve guide 280 in the valve receiving groove 35 by the fixed spring 260 An annular flange 225 is formed in the groove.

In addition, the ball valve guide 280 is formed to the tapered spring fixing protrusion 235 on the other side so that the support spring 220 can be press-fitted by the ball valve 290.

The support spring 220 is in contact with the outer circumferential surface of the ball valve 290 and the other end is in contact with the spring fixing protrusion 235 to elastically support the ball valve 290 and the ball valve guide 280 ) Is mounted inside.

The fixed spring 260 is formed of a compression coil spring to generate a force that pushes the ball valve guide 280 toward the bypass hole 28, but one end press-fits the flange 225 of the ball valve guide 280. The other end is fastened to the spring fixing groove 250 formed on the inner circumferential surface of the valve accommodation groove 45 to fix the ball valve guide 280 to the valve accommodation groove 45.

Hereinafter, the bypass valve structure of the rotary compressor according to the present invention has the following effects.

The bypass valve 200 is composed of a ball valve guide 280, a ball valve 290, a support spring 220 and a fixed spring 260 to reduce the number of parts, and the ball valve guide 280 and By assembling the ball valve 290 and the support spring 220 in a modular manner, the assembly process can be simplified to increase the productivity of the compressor and reduce the vibration of the valve.

Further, the ball valve guide 280 is in direct contact with the tip of the bypass hole 16, and the surface where the ball valve guide 280 and the ball valve 290 is in contact with the curved surface to induce surface contact, The efficiency of the compressor can be increased by reducing the enemy.

Figure 6 is a cross-sectional view showing another embodiment of the present invention, the specific configuration and operation is the same as in the above-described embodiment, the same reference numerals are assigned to the same parts and detailed description of the configuration and operation will be omitted. In the fixing means for fixing the modular ball valve guide 280 in the valve receiving groove 45, it shows a structure for fixing by using a screw form without using the fixing spring 260. The first thread 255 is formed on the outer circumferential surface of the flange 225 mounted on the ball valve guide 280, and the second thread (s) is formed on the inner circumferential surface of the valve receiving groove 45 that the ball valve guide 280 contacts. 245 is formed to fasten the ball valve guide 280 to the inside of the valve receiving groove 45 through screwing.

The bypass valve structure of the rotary compressor according to the present invention changes the structure of the bypass valve using a ball valve, a ball valve guide, a support spring, and a fixed spring, and improves the assembly process and productivity through modularization. In addition, in the conventional bypass valve structure, it is possible to reduce the valve vibration noise generated when switching modes. In addition, there is an effect of reducing the dead volume of the bypass valve and preventing the leakage of the refrigerant to increase the efficiency of the compressor.

Claims (8)

A bypass hole is formed on one side of the cylinder so that a part of the compressed refrigerant gas is bypassed, and a valve for opening and closing the bypass hole is installed in the valve receiving groove communicating with the bypass hole to change the capacity of the compressor. In the bypass valve structure of the compressor, A ball valve guide fixed to the valve receiving groove of the cylinder and having a through hole communicating with the bypass hole and a gas discharge groove through which the refrigerant gas is discharged; A ball valve provided inside the ball valve guide to open and close the bypass hole according to a pressure difference between the bypass hole and the valve receiving groove; A support spring fixed to the ball valve guide and elastically supporting the ball; Bypass valve structure of the rotary compressor comprising a fixing means for fixing the ball valve guide in the valve receiving groove. The method of claim 1, The gas discharge groove is a bypass valve structure of a rotary compressor, characterized in that formed through the outer peripheral surface of the valve guide in a direction perpendicular to the movement direction of the ball valve. The method of claim 1, The gas discharge groove is a bypass valve structure of a rotary compressor, characterized in that formed through the outer circumferential surface of the ball valve guide in the direction in which the refrigerant gas is bypassed and inclined direction.        The method of claim 2 or 3, The ball valve guide is a bypass valve structure of the rotary compressor, characterized in that the through-hole and the ball valve contact portion of the contact hole of the ball valve and the inner peripheral surface is processed into a curved surface.        The method according to claim 2 or 3, The ball valve guide has a bypass valve structure of a rotary compressor, characterized in that it comprises an inner circumferential surface in which the contact portion of the through hole and the ball valve is processed in a plane so as to make line contact with the through hole. The method of claim 1, At least one of the ball valve and the ball valve guide is a bypass valve structure of a rotary compressor, characterized in that formed of a plastic material. The method of claim 1, The fixing means includes a fixed spring mounted inside the bypass valve, a spring fixing groove recessed in an inner circumferential surface of the ball receiving groove in which one side of the fixed spring is fixed, and the other side of the fixed spring to press-fit the ball valve guide. Bypass valve structure of the rotary compressor, characterized in that it comprises a flange formed on the outer peripheral surface of the ball valve guide. The method of claim 1, The fixing means of the bypass valve structure of the rotary compressor characterized in that the first screw thread formed on one side of the inner circumferential surface of the valve receiving groove, the second screw thread formed on the outer circumferential surface of the ball valve guide is fixed by their screw coupling.

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