KR101233727B1 - Apparatus for preventing vacumm of scroll compressor - Google Patents

Abstract

The vacuum compressor of the scroll compressor according to the present invention includes a plurality of vacuum preventing units which are respectively provided along the movement trajectory of the compression chamber and installed to communicate with each other between the suction space and the discharge space of the casing, thereby providing a high vacuum of the compressor. By bypassing the refrigerant in the discharge space to the suction space during operation, it is possible not only to prevent the compression chamber from high vacuum, but also to bypass the refrigerant in the discharge space to the suction space even when the compressor is stopped. By achieving a pressure balance, it is possible to smoothly restart the compressor.

Description

Vacuum compressor of scroll compressor {APPARATUS FOR PREVENTING VACUMM OF SCROLL COMPRESSOR}

1 is a cross-sectional view showing an example of a scroll compressor equipped with a conventional vacuum prevention device,

Figure 2 is a cross-sectional view showing the operating state of the vacuum preventing unit during normal operation in the conventional scroll compressor,

3 is a cross-sectional view showing the operation of the vacuum preventing unit during high vacuum operation in the conventional scroll compressor,

4 is a cross-sectional view showing an example of a scroll compressor provided with a vacuum preventing device of the present invention;

Figure 5 is an enlarged cross-sectional view of the vacuum preventing device in the scroll compressor of the present invention,

Figure 6 is a cross-sectional view showing the operating state of the vacuum preventing unit during normal operation in the scroll compressor of the present invention,

7 is a cross-sectional view showing the operating state of the vacuum preventing unit during high vacuum operation in the scroll compressor of the present invention,

Figure 8 is a cross-sectional view showing the operating state of the vacuum prevention unit when stopped in the scroll compressor of the present invention.

DESCRIPTION OF REFERENCE NUMERALS

110: casing 120: mainframe

130: fixed scroll 131: hard plate portion

132: fixed wrap 135: bypass hole

136: medium pressure flow path 140: turning scroll

150: vacuum prevention unit 151: valve block

152,153: 1st, 2nd valve 154,155: 1st, 2nd valve spring

156a, 156b: first and second valve holes 157: suction pressure flow path

158: discharge pressure passage 159a, 159b: bypass passage

The present invention relates to a scroll compressor, and more particularly, to a vacuum compressor of a scroll compressor which prevents the compression chamber from operating in a vacuum state by allowing a part of the refrigerant discharged into the high pressure chamber to flow into the compression chamber when the compression chamber is evacuated during operation. It is about.

Generally, the scroll compressor is constituted such that the orbiting scroll which pivots by the crankshaft has an involute-shaped orbiting wrap to form a compression chamber which continuously moves together with the involute-shaped fixed lap of the fixed scroll, The volume of the compression chamber is gradually reduced while eccentrically revolving by the rotation of the crankshaft, thereby compressing the refrigerant filled in the compression chamber and discharging the compressed refrigerant through the discharge port when the compression ratio reaches a certain compression ratio.

The scroll compressor is widely used for compressing refrigerant in an air conditioner or the like because it can obtain a relatively high compression ratio as compared with other types of compressors, and smoothly connects the suction-compression-discharge stroke of the refrigerant to obtain stable torque. In addition, the scroll compressor has to distinguish between the suction space of the low pressure portion and the discharge space of the high pressure portion during normal operation, while the suction space and the discharge space communicate with each other under very low suction pressure such as a pump-down operation or a cycle clogging operation. The high pressure refrigerant discharged into the space is introduced into the compression chamber through the suction space to prevent high vacuum of the compressor.

1 is a cross-sectional view showing an example of a scroll compressor equipped with a conventional vacuum prevention device, Figure 2 is a cross-sectional view showing the operating state of the vacuum prevention unit during normal operation in the conventional scroll compressor, Figure 3 is a high vacuum operation in the conventional scroll compressor This is a cross-sectional view showing the operating state of the vacuum prevention unit.

As shown in the drawing, the conventional scroll compressor includes a casing 10 having a suction space S1 as a low pressure part and a discharge space S2 as a high pressure part, and a main frame fixedly installed in the casing 10. 20 and a fixed scroll 30 fixedly installed on the upper surface of the main frame 20 to form a compression chamber P continuously moving together with the revolving scroll 40 and the fixed scroll 30. When the pressure in the compression chamber (P) is lowered below a predetermined pressure, the discharge space (S2), which is the high pressure part, and the suction space (S1), which is the low pressure part, are in communication with each other to guide a part of the discharged refrigerant to the compression chamber (P). Vacuum prevention unit 50 is included.

The casing 10 is fixed by the high and low pressure separating plate 11 whose inner circumferential surface is tightly fixed to the upper surface of the hard plate portion 31 of the fixed scroll 30 while its outer circumferential surface is sealed to the inner circumferential surface of the casing 10. The suction space S1, which is a low pressure part, and the discharge space S2, which is a high pressure part, are partitioned, and the suction pipe 12 is communicatively coupled to the suction space S1, while the discharge tube 13 is communicatively coupled to the discharge space S2. It is.

The fixed scroll 30 is opened and closed by the sliding valve 51 of the vacuum prevention unit 50, which will be described later, on the hard plate part 31 to open and close the suction space S1 and the discharge space S2 of the casing 10. The bypass flow path portion is formed. 2 and 3, the bypass passage portion has a valve hole 32 which is formed so as to be negatively formed at a predetermined depth in the transverse direction in the hard plate portion 31 of the fixed scroll 30, and the valve hole 32 is A suction pressure passage 33 formed to communicate with the suction space S1 of the casing 10, an intermediate pressure passage 34 formed so that the valve hole 32 communicates with the compression chamber, and the valve hole 32. ) Is composed of a discharge pressure passage 35 formed to communicate with the discharge space (S2) of the casing (10).

The vacuum preventing unit 50 is slidably inserted into the valve hole 32 of the fixed scroll 30 to shut off the discharge pressure passage 35 when the pressure in the compression chamber P maintains a constant pressure. On the other hand, when the pressure in the compression chamber (P) drops below a predetermined pressure, the discharge pressure passage 35 and the suction pressure passage 33 communicate with each other so that a part of the refrigerant in the discharge space S2 is the suction space S1. Sliding valve 51 to be introduced into the), and is provided on one side of the sliding valve 51 is composed of a valve spring 52 for elastically supporting the sliding valve 51.

In the drawings, reference numeral 36 denotes a fixed wrap, 37 a suction port, 38 a discharge port, 41 a turning wrap, 53 a valve cap, 54 a fixing pin, 61 a stator, 62 a rotor, 63 a crankshaft, 64 a It is a subframe.

The vacuum prevention device of the conventional scroll compressor as described above, when the new refrigerant is continuously supplied to the compression chamber (P), the vacuum prevention unit 50 is the discharge pressure flow path 35 and the suction pressure of the fixed scroll (30) While blocking the flow path 33 so that the refrigerant is normally compressed, when the amount of the refrigerant sucked into the compression chamber P is extremely small, the vacuum preventing unit 50 operates to discharge the flow path 35 and A portion of the refrigerant discharged into the discharge space S2 is supplied to the compression chamber P through the suction space S1 while the suction pressure flow path 33 is in communication.

For example, as shown in FIG. 2, when the pressure of the compression chamber P maintains a predetermined pressure or more, the force due to the pressure of the compression chamber P may cause the elastic force of the valve spring 52 and the suction space S1. While the sliding valve 51 blocks the discharge pressure flow path 35 while the sum of the pressures is balanced, as shown in FIG. 3, when the pressure of the compression chamber P drops below a predetermined pressure, the compression chamber ( As the force by the pressure of P) becomes smaller than the combined force of the elastic force of the valve spring 52 and the pressure of the suction space S1, the sliding valve 51 is pushed against the valve spring 52 and discharged to the discharge pressure passage ( 35) was in communication with the suction pressure passage (33).

However, the vacuum prevention device of the conventional scroll compressor as described above was to act when the pressure in the compression chamber (P) is excessively lowered to prevent the compression chamber (P) from high vacuum.

The present invention is designed to solve the problems of the conventional vacuum compressor of the scroll compressor, the vacuum prevention device not only prevents the high vacuum of the compression chamber, but also the pressure balance between the suction pressure and the discharge pressure when the compressor is stopped. SUMMARY OF THE INVENTION An object of the present invention is to provide a vacuum compressor of a scroll compressor having a function of smoothly restarting.

In order to achieve the object of the present invention, the sealed inner space is divided into a suction space of the low pressure portion and the discharge space of the high pressure portion; A fixed scroll installed between the suction space and the discharge space of the casing to form a compression chamber continuously engaged with the swing scroll; And a plurality of vacuum preventing units, each provided along a moving trajectory of the compression chamber and installed to communicate with each other between the suction space and the discharge space of the casing.

EMBODIMENT OF THE INVENTION Hereinafter, the vacuum prevention apparatus of the scroll compressor by this invention is demonstrated in detail based on attached drawing.

4 is a cross-sectional view showing an example of a scroll compressor with a vacuum preventing device of the present invention, Figure 5 is a cross-sectional view showing an enlarged vacuum preventing device in the scroll compressor of the present invention, Figure 6 is a vacuum during normal operation in the scroll compressor of the present invention 7 is a cross-sectional view showing the operating state of the prevention unit, Figure 7 is a cross-sectional view showing the operating state of the vacuum prevention unit during high vacuum operation in the scroll compressor of the present invention, Figure 8 is a view showing the operating state of the vacuum prevention unit when stopped in the scroll compressor of the present invention. Cross section.

As shown in the drawing, the scroll compressor includes a casing 110 in which a suction space S1 serving as a low pressure part and a discharge space S2 serving as a high pressure part are partitioned, and a main fixedly installed in the casing 110. Fixed scroll 130 and the fixed scroll 130 is formed fixed to the upper surface of the main frame 120, the compression chamber (P) to move continuously with the rotating scroll 140, the fixed scroll 130 When the pressure of the compression chamber (P) is lowered below a predetermined pressure or the compressor is stopped or the compressor is stopped, the discharge space (S2), which is the high pressure part, and the suction space (S1), which is the low pressure part, are communicated to compress a part of the discharged refrigerant. Vacuum prevention unit 150 to guide the seal (P) is included.

As shown in FIG. 4, the casing 110 has the outer circumferential surface of the fixed plate 130 of the fixed scroll 130 in close contact with the inner circumferential surface thereof, so that the suction space S1 serving as the low pressure portion and the discharge space S2 serving as the high pressure portion are partitioned. The suction tube 112 is communicatively coupled to the space S1, while the discharge tube 113 is communicatively coupled to the discharge space S2. In addition, although not shown in the drawing, the casing 110 is provided with a predetermined discharge space that is sealed and low pressure by a discharge plenum (not shown) fixedly coupled to the upper surface of the hard plate portion 131 of the fixed scroll 130. The female suction space (S1) and the discharge space (S2), which is a high-pressure part, may be partitioned, or may be fixed by an upper and lower pressure separation plate (not shown) fixed to an upper surface of the fixed scroll 130 and in close contact with an inner circumferential surface of the casing 110. The inner space of the casing 110 may be divided into the suction space S1 and the discharge space S2.

The fixed scroll 130 is protruded to the bottom surface of the hard plate portion 131 as shown in Figure 4 and 5 to form an involute shape to form a compression chamber (P) with the turning wrap 141 of the turning scroll 140 The fixed wrap 132 is formed, and the suction plate 133 is formed on the outer circumferential bottom surface of the hard plate portion 131 so that the suction space S1 and the compression chamber P of the casing 110 communicate with each other. A discharge port 134 is formed at the center of the hard plate portion 131 so that the compression chamber P and the discharge space S2 of the casing 110 communicate with each other.

In addition, the fixed scroll 130 is the suction space (S1) and the discharge space (1) of the casing 110 by the valve member 152 of the vacuum prevention unit 150 to be described later on the outer periphery of the hard plate portion 131 The bypass hole 135 is formed to be inclined at a predetermined angle so as to open and close S2, and the first valve of the valve block 155 to be described later in the first intermediate compression chamber P1 at the middle portion of the hard plate portion 131. A first intermediate pressure passage 136 is formed to communicate with the hole 155a, and a second valve hole of the valve block 155 to be described later in the second intermediate compression chamber P2 is formed inside the first intermediate pressure passage. A second intermediate pressure passage 137 is formed to communicate with 155b.

As shown in FIG. 5, the vacuum preventing unit 150 has a plurality of internal flow paths formed therein so that the bypass hole 135 of the fixed scroll 130 and the discharge space S2 of the casing 110 communicate with each other. 130 is provided between the valve block 151 and the bypass hole 135 of the fixed scroll 130 and the respective internal flow paths of the valve block 151 to change the pressure of the compression chamber P. Accordingly, a plurality of valves 152 and 153 that open and close between the bypass hole 135 and each of the internal flow paths, and are respectively supported on the upper and lower surfaces of the valves 152 and 153, respectively. 153 is composed of a plurality of elastic members 154, 155 added to slide up and down according to the pressure difference.

As shown in FIG. 5, the valve block 151 has a first valve hole 156a and a second valve hole 156b formed parallel to each other in a vertical direction, and a first valve hole 156a is disposed at one side of the first valve hole 156a. While in communication with the intermediate pressure passage 136, the suction pressure passage 157 is formed on the other side communicated with the suction space (S1) through the bypass hole 135 of the fixed scroll 130, the second valve hole A discharge pressure passage 158 communicating with the second intermediate pressure passage 137 on one side of the at least one side 156b is formed on the other side thereof and communicates with the discharge space S2, and a second valve hole ( The discharge side bypass passage 159a and the intermediate bypass passage 159b communicating with the first valve hole 156a through the 156b are provided in the direction of movement of the first valve 152 and the second valve 153. It is formed in the direction orthogonal.

The bypass valve 156a opens the bypass passage 159 when the first valve 152 descends to the lowest end, while the bypass passage passes when the first valve hole 156a rises to the uppermost end after the first valve spring 154. 159a and 159b are formed to have a closing depth, and the second valve hole 156b opens the bypass passage 159 when the second valve 153 is raised to the uppermost end while the second valve spring 156 is opened. The bypass flow paths 159a and 159b are formed to be closed when the 155 is lowered to the bottom end.

In the drawings, the same reference numerals are given to the same parts as in the prior art.

In the figure, reference numeral 161 denotes a stator, 162 denotes a rotor, 163 denotes a crankshaft, and 164 denotes a subframe.

The vacuum compressor of the scroll compressor according to the present invention as described above has the following effects.

That is, when power is applied to the stator 161, the rotor 162 rotates the crankshaft 163 while rotating by receiving the electromagnetic force of the stator 161, and is eccentrically coupled to the tip of the crankshaft 163. Two pairs of compression chambers (P) which are continuously moved between the fixed scroll (130) and the rotating scroll (140) is formed. In this process, the refrigerant provided from the outside of the casing 110 flows into the suction space S1, which is the low pressure portion of the casing 110, through the suction pipe 112, and the low pressure refrigerant in the suction space S1 is fixed to the scroll ( Through the suction port 133 of the 130 is introduced into the outermost compression chamber (P1) and gradually pushed to the rotating scroll 140 to the inner final compression chamber (P3) was compressed and then the compression of the fixed scroll (130) A series of processes to be discharged to the discharge space (S2) of the casing 110 through the discharge port 133 is repeated.

In detail, first, when the compressor is normally operated as shown in FIG. 6, the first intermediate compression chamber P1 is added to the lower end of the first valve 152 through the first intermediate pressure passage 156a. The force Fp1 by the pressure is greater than the sum of the suction force Fs added to the upper end of the first valve 152 through the suction pressure flow path 157 and the elastic force Fk1 of the first valve spring 154. As the first valve 152 rises, the intermediate bypass flow path 159b is blocked. At the same time, the pressure Fp2 of the second intermediate compression chamber P2 and the elastic force Fk2 of the second valve spring 155 added to the lower end of the second valve 153 through the second intermediate pressure passage 156b. The combined force is greater than the force by the pressure Fd of the discharge space added through the discharge pressure passage 158 so that the second valve 153 rises to an intermediate height to block the discharge side bypass passage 159a. Done. At this time, as the compressed refrigerant is continuously discharged into the discharge space S2, and the second valve 153 is added through the discharge pressure passage 158, the second valve 153 is connected to the second valve hole 156b. By preventing the movement to the upper end of the) will keep the bypass hole 135 closed during the normal operation of the compressor.

Next, when the compressor performs a high vacuum operation, as shown in FIG. 7, the pressure applied to the upper and lower ends of the first valve 152 and the second valve 153 becomes opposite to that of the previous normal operation. Both the 152 and the second valve 153 are lowered to open the discharge side bypass passage 159a and the intermediate side bypass passage 159b. The high-pressure discharge refrigerant filled in the discharge space S2 through the open bypass passages 159a and 159b is guided to the suction pressure passage 157 through the bypass passages 159a and 159b. The refrigerant flows back into the suction space S1 through the suction pressure flow path 157 and is supplied to the compression chamber P again to prevent high vacuum of the compression chamber P.

Next, when the compressor is stopped as shown in FIG. 8, the pressure of the first intermediate compression chamber P1 is lowered and the pressure Fs of the suction space S1 added through the suction pressure flow path 157 and the first pressure. 1 The combined force of the elastic force (Fk1) of the valve spring 154 is greater than the force by the pressure (Fp1) of the first intermediate compression chamber (P1) is added through the first intermediate pressure passage 136, the first valve ( 152 is lowered to the lowermost end to open the intermediate bypass passage 159b. At the same time, the pressure of the second intermediate compression chamber P2 is also lowered at the initial stage of the stop of the compressor such that the force due to the pressure of the discharge space S2 added through the discharge pressure passage 158 is the elastic force of the second valve spring 155. The discharge side bypass flow path 159a is opened while the second valve 153 maintains the intermediate height as shown by the dotted line in FIG. 8 because the pressure Fp2 of the Fk2 and the second intermediate compression chamber P2 is greater than the sum of the forces. As the stop time of the compressor increases, the refrigerant, which has been filled in the discharge space S2, is gradually discharged into the refrigeration cycle, and the pressure in the discharge space S2 is lowered. As shown in FIG. 8, the second valve 153 is closed. The second valve hole 156b is further raised to the upper end, whereby the discharge-side bypass passage 159a is opened, and the refrigerant in the discharge space S2 passes through the bypass passages 159a and 159b to the suction space S1. It moves quickly and balances pressure inside the compressor. Accordingly, when the compressor is restarted, the pressure equalization between the suction space S1 and the discharge space S2 is not achieved, and thus, a delay in starting may be prevented.

The vacuum compressor of the scroll compressor according to the present invention not only prevents the compression chamber from being highly vacuumed by bypassing the refrigerant in the discharge space to the suction space during the high vacuum operation of the compressor, but also discharges it when the compressor is stopped. By bypassing the refrigerant in the space to the suction space to quickly balance the pressure inside the compressor can be restarted smoothly.

Claims (5)

A casing in which the sealed inner space is divided into a suction space that is a low pressure part and a discharge space that is a high pressure part; A fixed scroll installed to be located between the suction space and the discharge space of the casing and having a first compression chamber and a second compression chamber which are continuously engaged with the swing scroll; And And a plurality of vacuum preventing units, respectively provided along the moving trajectories of the first compression chamber and the second compression chamber, and installed to communicate with each other between the suction space and the discharge space of the casing. While the compressor is in normal operation, the compressor blocks the space between the suction space and the discharge space. When the compressor is vacuum operated, the compressor opens between the suction space and the discharge space, The vacuum compressor of the scroll compressor to open between the suction space and the discharge space when the compressor is stopped. delete The method of claim 1, The plurality of vacuum prevention unit, A first valve hole is formed to communicate with the first compression chamber and the suction space, and a second valve hole is formed to communicate with the second compression chamber and the discharge space, and communicates with the first compression chamber through the second compression chamber in the discharge space. A valve block in which a bypass flow path is formed, A first valve slidably inserted into the first valve hole of the valve block to open and close the bypass flow path; A first valve spring elastically supported on one side of the first valve, A second valve slidably inserted into the second valve hole of the valve block to open and close the bypass flow path; The vacuum compressor of the scroll compressor consisting of a second valve spring is elastically supported on one side of the second valve. The method of claim 3, And the second intermediate pressure passage communicating with the first valve hole and the second intermediate pressure passage communicating with the second valve hole are independently formed on the fixed scroll. The method of claim 3, The valve block has a first valve hole and a second valve hole formed in parallel, and one side of the first valve hole communicates with the first intermediate pressure flow path, while the other side has a suction pressure flow passage communicating with the suction space. One side of the second valve hole communicates with the second intermediate pressure passage, while the other side has a discharge pressure passage communicating with the discharge space, and the via communicates with the first valve hole through the second valve hole. And a pass passage is formed in a direction orthogonal to the movement directions of the first valve and the second valve.

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